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-rw-r--r--mesalib/src/glsl/ast_to_hir.cpp7234
1 files changed, 3617 insertions, 3617 deletions
diff --git a/mesalib/src/glsl/ast_to_hir.cpp b/mesalib/src/glsl/ast_to_hir.cpp
index 484786c5f..f9fd1d68a 100644
--- a/mesalib/src/glsl/ast_to_hir.cpp
+++ b/mesalib/src/glsl/ast_to_hir.cpp
@@ -1,3617 +1,3617 @@
-/*
- * Copyright © 2010 Intel Corporation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- */
-
-/**
- * \file ast_to_hir.c
- * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
- *
- * During the conversion to HIR, the majority of the symantic checking is
- * preformed on the program. This includes:
- *
- * * Symbol table management
- * * Type checking
- * * Function binding
- *
- * The majority of this work could be done during parsing, and the parser could
- * probably generate HIR directly. However, this results in frequent changes
- * to the parser code. Since we do not assume that every system this complier
- * is built on will have Flex and Bison installed, we have to store the code
- * generated by these tools in our version control system. In other parts of
- * the system we've seen problems where a parser was changed but the generated
- * code was not committed, merge conflicts where created because two developers
- * had slightly different versions of Bison installed, etc.
- *
- * I have also noticed that running Bison generated parsers in GDB is very
- * irritating. When you get a segfault on '$$ = $1->foo', you can't very
- * well 'print $1' in GDB.
- *
- * As a result, my preference is to put as little C code as possible in the
- * parser (and lexer) sources.
- */
-
-#include "main/core.h" /* for struct gl_extensions */
-#include "glsl_symbol_table.h"
-#include "glsl_parser_extras.h"
-#include "ast.h"
-#include "glsl_types.h"
-#include "ir.h"
-
-void
-_mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
-{
- _mesa_glsl_initialize_variables(instructions, state);
- _mesa_glsl_initialize_functions(state);
-
- state->symbols->language_version = state->language_version;
-
- state->current_function = NULL;
-
- state->toplevel_ir = instructions;
-
- /* Section 4.2 of the GLSL 1.20 specification states:
- * "The built-in functions are scoped in a scope outside the global scope
- * users declare global variables in. That is, a shader's global scope,
- * available for user-defined functions and global variables, is nested
- * inside the scope containing the built-in functions."
- *
- * Since built-in functions like ftransform() access built-in variables,
- * it follows that those must be in the outer scope as well.
- *
- * We push scope here to create this nesting effect...but don't pop.
- * This way, a shader's globals are still in the symbol table for use
- * by the linker.
- */
- state->symbols->push_scope();
-
- foreach_list_typed (ast_node, ast, link, & state->translation_unit)
- ast->hir(instructions, state);
-
- detect_recursion_unlinked(state, instructions);
-
- state->toplevel_ir = NULL;
-}
-
-
-/**
- * If a conversion is available, convert one operand to a different type
- *
- * The \c from \c ir_rvalue is converted "in place".
- *
- * \param to Type that the operand it to be converted to
- * \param from Operand that is being converted
- * \param state GLSL compiler state
- *
- * \return
- * If a conversion is possible (or unnecessary), \c true is returned.
- * Otherwise \c false is returned.
- */
-bool
-apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
- struct _mesa_glsl_parse_state *state)
-{
- void *ctx = state;
- if (to->base_type == from->type->base_type)
- return true;
-
- /* This conversion was added in GLSL 1.20. If the compilation mode is
- * GLSL 1.10, the conversion is skipped.
- */
- if (state->language_version < 120)
- return false;
-
- /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
- *
- * "There are no implicit array or structure conversions. For
- * example, an array of int cannot be implicitly converted to an
- * array of float. There are no implicit conversions between
- * signed and unsigned integers."
- */
- /* FINISHME: The above comment is partially a lie. There is int/uint
- * FINISHME: conversion for immediate constants.
- */
- if (!to->is_float() || !from->type->is_numeric())
- return false;
-
- /* Convert to a floating point type with the same number of components
- * as the original type - i.e. int to float, not int to vec4.
- */
- to = glsl_type::get_instance(GLSL_TYPE_FLOAT, from->type->vector_elements,
- from->type->matrix_columns);
-
- switch (from->type->base_type) {
- case GLSL_TYPE_INT:
- from = new(ctx) ir_expression(ir_unop_i2f, to, from, NULL);
- break;
- case GLSL_TYPE_UINT:
- from = new(ctx) ir_expression(ir_unop_u2f, to, from, NULL);
- break;
- case GLSL_TYPE_BOOL:
- from = new(ctx) ir_expression(ir_unop_b2f, to, from, NULL);
- break;
- default:
- assert(0);
- }
-
- return true;
-}
-
-
-static const struct glsl_type *
-arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
- bool multiply,
- struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
-{
- const glsl_type *type_a = value_a->type;
- const glsl_type *type_b = value_b->type;
-
- /* From GLSL 1.50 spec, page 56:
- *
- * "The arithmetic binary operators add (+), subtract (-),
- * multiply (*), and divide (/) operate on integer and
- * floating-point scalars, vectors, and matrices."
- */
- if (!type_a->is_numeric() || !type_b->is_numeric()) {
- _mesa_glsl_error(loc, state,
- "Operands to arithmetic operators must be numeric");
- return glsl_type::error_type;
- }
-
-
- /* "If one operand is floating-point based and the other is
- * not, then the conversions from Section 4.1.10 "Implicit
- * Conversions" are applied to the non-floating-point-based operand."
- */
- if (!apply_implicit_conversion(type_a, value_b, state)
- && !apply_implicit_conversion(type_b, value_a, state)) {
- _mesa_glsl_error(loc, state,
- "Could not implicitly convert operands to "
- "arithmetic operator");
- return glsl_type::error_type;
- }
- type_a = value_a->type;
- type_b = value_b->type;
-
- /* "If the operands are integer types, they must both be signed or
- * both be unsigned."
- *
- * From this rule and the preceeding conversion it can be inferred that
- * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
- * The is_numeric check above already filtered out the case where either
- * type is not one of these, so now the base types need only be tested for
- * equality.
- */
- if (type_a->base_type != type_b->base_type) {
- _mesa_glsl_error(loc, state,
- "base type mismatch for arithmetic operator");
- return glsl_type::error_type;
- }
-
- /* "All arithmetic binary operators result in the same fundamental type
- * (signed integer, unsigned integer, or floating-point) as the
- * operands they operate on, after operand type conversion. After
- * conversion, the following cases are valid
- *
- * * The two operands are scalars. In this case the operation is
- * applied, resulting in a scalar."
- */
- if (type_a->is_scalar() && type_b->is_scalar())
- return type_a;
-
- /* "* One operand is a scalar, and the other is a vector or matrix.
- * In this case, the scalar operation is applied independently to each
- * component of the vector or matrix, resulting in the same size
- * vector or matrix."
- */
- if (type_a->is_scalar()) {
- if (!type_b->is_scalar())
- return type_b;
- } else if (type_b->is_scalar()) {
- return type_a;
- }
-
- /* All of the combinations of <scalar, scalar>, <vector, scalar>,
- * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
- * handled.
- */
- assert(!type_a->is_scalar());
- assert(!type_b->is_scalar());
-
- /* "* The two operands are vectors of the same size. In this case, the
- * operation is done component-wise resulting in the same size
- * vector."
- */
- if (type_a->is_vector() && type_b->is_vector()) {
- if (type_a == type_b) {
- return type_a;
- } else {
- _mesa_glsl_error(loc, state,
- "vector size mismatch for arithmetic operator");
- return glsl_type::error_type;
- }
- }
-
- /* All of the combinations of <scalar, scalar>, <vector, scalar>,
- * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
- * <vector, vector> have been handled. At least one of the operands must
- * be matrix. Further, since there are no integer matrix types, the base
- * type of both operands must be float.
- */
- assert(type_a->is_matrix() || type_b->is_matrix());
- assert(type_a->base_type == GLSL_TYPE_FLOAT);
- assert(type_b->base_type == GLSL_TYPE_FLOAT);
-
- /* "* The operator is add (+), subtract (-), or divide (/), and the
- * operands are matrices with the same number of rows and the same
- * number of columns. In this case, the operation is done component-
- * wise resulting in the same size matrix."
- * * The operator is multiply (*), where both operands are matrices or
- * one operand is a vector and the other a matrix. A right vector
- * operand is treated as a column vector and a left vector operand as a
- * row vector. In all these cases, it is required that the number of
- * columns of the left operand is equal to the number of rows of the
- * right operand. Then, the multiply (*) operation does a linear
- * algebraic multiply, yielding an object that has the same number of
- * rows as the left operand and the same number of columns as the right
- * operand. Section 5.10 "Vector and Matrix Operations" explains in
- * more detail how vectors and matrices are operated on."
- */
- if (! multiply) {
- if (type_a == type_b)
- return type_a;
- } else {
- if (type_a->is_matrix() && type_b->is_matrix()) {
- /* Matrix multiply. The columns of A must match the rows of B. Given
- * the other previously tested constraints, this means the vector type
- * of a row from A must be the same as the vector type of a column from
- * B.
- */
- if (type_a->row_type() == type_b->column_type()) {
- /* The resulting matrix has the number of columns of matrix B and
- * the number of rows of matrix A. We get the row count of A by
- * looking at the size of a vector that makes up a column. The
- * transpose (size of a row) is done for B.
- */
- const glsl_type *const type =
- glsl_type::get_instance(type_a->base_type,
- type_a->column_type()->vector_elements,
- type_b->row_type()->vector_elements);
- assert(type != glsl_type::error_type);
-
- return type;
- }
- } else if (type_a->is_matrix()) {
- /* A is a matrix and B is a column vector. Columns of A must match
- * rows of B. Given the other previously tested constraints, this
- * means the vector type of a row from A must be the same as the
- * vector the type of B.
- */
- if (type_a->row_type() == type_b) {
- /* The resulting vector has a number of elements equal to
- * the number of rows of matrix A. */
- const glsl_type *const type =
- glsl_type::get_instance(type_a->base_type,
- type_a->column_type()->vector_elements,
- 1);
- assert(type != glsl_type::error_type);
-
- return type;
- }
- } else {
- assert(type_b->is_matrix());
-
- /* A is a row vector and B is a matrix. Columns of A must match rows
- * of B. Given the other previously tested constraints, this means
- * the type of A must be the same as the vector type of a column from
- * B.
- */
- if (type_a == type_b->column_type()) {
- /* The resulting vector has a number of elements equal to
- * the number of columns of matrix B. */
- const glsl_type *const type =
- glsl_type::get_instance(type_a->base_type,
- type_b->row_type()->vector_elements,
- 1);
- assert(type != glsl_type::error_type);
-
- return type;
- }
- }
-
- _mesa_glsl_error(loc, state, "size mismatch for matrix multiplication");
- return glsl_type::error_type;
- }
-
-
- /* "All other cases are illegal."
- */
- _mesa_glsl_error(loc, state, "type mismatch");
- return glsl_type::error_type;
-}
-
-
-static const struct glsl_type *
-unary_arithmetic_result_type(const struct glsl_type *type,
- struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
-{
- /* From GLSL 1.50 spec, page 57:
- *
- * "The arithmetic unary operators negate (-), post- and pre-increment
- * and decrement (-- and ++) operate on integer or floating-point
- * values (including vectors and matrices). All unary operators work
- * component-wise on their operands. These result with the same type
- * they operated on."
- */
- if (!type->is_numeric()) {
- _mesa_glsl_error(loc, state,
- "Operands to arithmetic operators must be numeric");
- return glsl_type::error_type;
- }
-
- return type;
-}
-
-/**
- * \brief Return the result type of a bit-logic operation.
- *
- * If the given types to the bit-logic operator are invalid, return
- * glsl_type::error_type.
- *
- * \param type_a Type of LHS of bit-logic op
- * \param type_b Type of RHS of bit-logic op
- */
-static const struct glsl_type *
-bit_logic_result_type(const struct glsl_type *type_a,
- const struct glsl_type *type_b,
- ast_operators op,
- struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
-{
- if (state->language_version < 130) {
- _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
- return glsl_type::error_type;
- }
-
- /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
- *
- * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
- * (|). The operands must be of type signed or unsigned integers or
- * integer vectors."
- */
- if (!type_a->is_integer()) {
- _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer",
- ast_expression::operator_string(op));
- return glsl_type::error_type;
- }
- if (!type_b->is_integer()) {
- _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer",
- ast_expression::operator_string(op));
- return glsl_type::error_type;
- }
-
- /* "The fundamental types of the operands (signed or unsigned) must
- * match,"
- */
- if (type_a->base_type != type_b->base_type) {
- _mesa_glsl_error(loc, state, "operands of `%s' must have the same "
- "base type", ast_expression::operator_string(op));
- return glsl_type::error_type;
- }
-
- /* "The operands cannot be vectors of differing size." */
- if (type_a->is_vector() &&
- type_b->is_vector() &&
- type_a->vector_elements != type_b->vector_elements) {
- _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of "
- "different sizes", ast_expression::operator_string(op));
- return glsl_type::error_type;
- }
-
- /* "If one operand is a scalar and the other a vector, the scalar is
- * applied component-wise to the vector, resulting in the same type as
- * the vector. The fundamental types of the operands [...] will be the
- * resulting fundamental type."
- */
- if (type_a->is_scalar())
- return type_b;
- else
- return type_a;
-}
-
-static const struct glsl_type *
-modulus_result_type(const struct glsl_type *type_a,
- const struct glsl_type *type_b,
- struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
-{
- if (state->language_version < 130) {
- _mesa_glsl_error(loc, state,
- "operator '%%' is reserved in %s",
- state->version_string);
- return glsl_type::error_type;
- }
-
- /* From GLSL 1.50 spec, page 56:
- * "The operator modulus (%) operates on signed or unsigned integers or
- * integer vectors. The operand types must both be signed or both be
- * unsigned."
- */
- if (!type_a->is_integer()) {
- _mesa_glsl_error(loc, state, "LHS of operator %% must be an integer.");
- return glsl_type::error_type;
- }
- if (!type_b->is_integer()) {
- _mesa_glsl_error(loc, state, "RHS of operator %% must be an integer.");
- return glsl_type::error_type;
- }
- if (type_a->base_type != type_b->base_type) {
- _mesa_glsl_error(loc, state,
- "operands of %% must have the same base type");
- return glsl_type::error_type;
- }
-
- /* "The operands cannot be vectors of differing size. If one operand is
- * a scalar and the other vector, then the scalar is applied component-
- * wise to the vector, resulting in the same type as the vector. If both
- * are vectors of the same size, the result is computed component-wise."
- */
- if (type_a->is_vector()) {
- if (!type_b->is_vector()
- || (type_a->vector_elements == type_b->vector_elements))
- return type_a;
- } else
- return type_b;
-
- /* "The operator modulus (%) is not defined for any other data types
- * (non-integer types)."
- */
- _mesa_glsl_error(loc, state, "type mismatch");
- return glsl_type::error_type;
-}
-
-
-static const struct glsl_type *
-relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
- struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
-{
- const glsl_type *type_a = value_a->type;
- const glsl_type *type_b = value_b->type;
-
- /* From GLSL 1.50 spec, page 56:
- * "The relational operators greater than (>), less than (<), greater
- * than or equal (>=), and less than or equal (<=) operate only on
- * scalar integer and scalar floating-point expressions."
- */
- if (!type_a->is_numeric()
- || !type_b->is_numeric()
- || !type_a->is_scalar()
- || !type_b->is_scalar()) {
- _mesa_glsl_error(loc, state,
- "Operands to relational operators must be scalar and "
- "numeric");
- return glsl_type::error_type;
- }
-
- /* "Either the operands' types must match, or the conversions from
- * Section 4.1.10 "Implicit Conversions" will be applied to the integer
- * operand, after which the types must match."
- */
- if (!apply_implicit_conversion(type_a, value_b, state)
- && !apply_implicit_conversion(type_b, value_a, state)) {
- _mesa_glsl_error(loc, state,
- "Could not implicitly convert operands to "
- "relational operator");
- return glsl_type::error_type;
- }
- type_a = value_a->type;
- type_b = value_b->type;
-
- if (type_a->base_type != type_b->base_type) {
- _mesa_glsl_error(loc, state, "base type mismatch");
- return glsl_type::error_type;
- }
-
- /* "The result is scalar Boolean."
- */
- return glsl_type::bool_type;
-}
-
-/**
- * \brief Return the result type of a bit-shift operation.
- *
- * If the given types to the bit-shift operator are invalid, return
- * glsl_type::error_type.
- *
- * \param type_a Type of LHS of bit-shift op
- * \param type_b Type of RHS of bit-shift op
- */
-static const struct glsl_type *
-shift_result_type(const struct glsl_type *type_a,
- const struct glsl_type *type_b,
- ast_operators op,
- struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
-{
- if (state->language_version < 130) {
- _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
- return glsl_type::error_type;
- }
-
- /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
- *
- * "The shift operators (<<) and (>>). For both operators, the operands
- * must be signed or unsigned integers or integer vectors. One operand
- * can be signed while the other is unsigned."
- */
- if (!type_a->is_integer()) {
- _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
- "integer vector", ast_expression::operator_string(op));
- return glsl_type::error_type;
-
- }
- if (!type_b->is_integer()) {
- _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
- "integer vector", ast_expression::operator_string(op));
- return glsl_type::error_type;
- }
-
- /* "If the first operand is a scalar, the second operand has to be
- * a scalar as well."
- */
- if (type_a->is_scalar() && !type_b->is_scalar()) {
- _mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the "
- "second must be scalar as well",
- ast_expression::operator_string(op));
- return glsl_type::error_type;
- }
-
- /* If both operands are vectors, check that they have same number of
- * elements.
- */
- if (type_a->is_vector() &&
- type_b->is_vector() &&
- type_a->vector_elements != type_b->vector_elements) {
- _mesa_glsl_error(loc, state, "Vector operands to operator %s must "
- "have same number of elements",
- ast_expression::operator_string(op));
- return glsl_type::error_type;
- }
-
- /* "In all cases, the resulting type will be the same type as the left
- * operand."
- */
- return type_a;
-}
-
-/**
- * Validates that a value can be assigned to a location with a specified type
- *
- * Validates that \c rhs can be assigned to some location. If the types are
- * not an exact match but an automatic conversion is possible, \c rhs will be
- * converted.
- *
- * \return
- * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
- * Otherwise the actual RHS to be assigned will be returned. This may be
- * \c rhs, or it may be \c rhs after some type conversion.
- *
- * \note
- * In addition to being used for assignments, this function is used to
- * type-check return values.
- */
-ir_rvalue *
-validate_assignment(struct _mesa_glsl_parse_state *state,
- const glsl_type *lhs_type, ir_rvalue *rhs,
- bool is_initializer)
-{
- /* If there is already some error in the RHS, just return it. Anything
- * else will lead to an avalanche of error message back to the user.
- */
- if (rhs->type->is_error())
- return rhs;
-
- /* If the types are identical, the assignment can trivially proceed.
- */
- if (rhs->type == lhs_type)
- return rhs;
-
- /* If the array element types are the same and the size of the LHS is zero,
- * the assignment is okay for initializers embedded in variable
- * declarations.
- *
- * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
- * is handled by ir_dereference::is_lvalue.
- */
- if (is_initializer && lhs_type->is_array() && rhs->type->is_array()
- && (lhs_type->element_type() == rhs->type->element_type())
- && (lhs_type->array_size() == 0)) {
- return rhs;
- }
-
- /* Check for implicit conversion in GLSL 1.20 */
- if (apply_implicit_conversion(lhs_type, rhs, state)) {
- if (rhs->type == lhs_type)
- return rhs;
- }
-
- return NULL;
-}
-
-static void
-mark_whole_array_access(ir_rvalue *access)
-{
- ir_dereference_variable *deref = access->as_dereference_variable();
-
- if (deref && deref->var) {
- deref->var->max_array_access = deref->type->length - 1;
- }
-}
-
-ir_rvalue *
-do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
- ir_rvalue *lhs, ir_rvalue *rhs, bool is_initializer,
- YYLTYPE lhs_loc)
-{
- void *ctx = state;
- bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
-
- if (!error_emitted) {
- if (lhs->variable_referenced() != NULL
- && lhs->variable_referenced()->read_only) {
- _mesa_glsl_error(&lhs_loc, state,
- "assignment to read-only variable '%s'",
- lhs->variable_referenced()->name);
- error_emitted = true;
-
- } else if (state->language_version <= 110 && lhs->type->is_array()) {
- /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
- *
- * "Other binary or unary expressions, non-dereferenced
- * arrays, function names, swizzles with repeated fields,
- * and constants cannot be l-values."
- */
- _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
- "allowed in GLSL 1.10 or GLSL ES 1.00.");
- error_emitted = true;
- } else if (!lhs->is_lvalue()) {
- _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
- error_emitted = true;
- }
- }
-
- ir_rvalue *new_rhs =
- validate_assignment(state, lhs->type, rhs, is_initializer);
- if (new_rhs == NULL) {
- _mesa_glsl_error(& lhs_loc, state, "type mismatch");
- } else {
- rhs = new_rhs;
-
- /* If the LHS array was not declared with a size, it takes it size from
- * the RHS. If the LHS is an l-value and a whole array, it must be a
- * dereference of a variable. Any other case would require that the LHS
- * is either not an l-value or not a whole array.
- */
- if (lhs->type->array_size() == 0) {
- ir_dereference *const d = lhs->as_dereference();
-
- assert(d != NULL);
-
- ir_variable *const var = d->variable_referenced();
-
- assert(var != NULL);
-
- if (var->max_array_access >= unsigned(rhs->type->array_size())) {
- /* FINISHME: This should actually log the location of the RHS. */
- _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
- "previous access",
- var->max_array_access);
- }
-
- var->type = glsl_type::get_array_instance(lhs->type->element_type(),
- rhs->type->array_size());
- d->type = var->type;
- }
- mark_whole_array_access(rhs);
- mark_whole_array_access(lhs);
- }
-
- /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
- * but not post_inc) need the converted assigned value as an rvalue
- * to handle things like:
- *
- * i = j += 1;
- *
- * So we always just store the computed value being assigned to a
- * temporary and return a deref of that temporary. If the rvalue
- * ends up not being used, the temp will get copy-propagated out.
- */
- ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
- ir_var_temporary);
- ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var);
- instructions->push_tail(var);
- instructions->push_tail(new(ctx) ir_assignment(deref_var,
- rhs,
- NULL));
- deref_var = new(ctx) ir_dereference_variable(var);
-
- if (!error_emitted)
- instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var, NULL));
-
- return new(ctx) ir_dereference_variable(var);
-}
-
-static ir_rvalue *
-get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
-{
- void *ctx = ralloc_parent(lvalue);
- ir_variable *var;
-
- var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
- ir_var_temporary);
- instructions->push_tail(var);
- var->mode = ir_var_auto;
-
- instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
- lvalue, NULL));
-
- /* Once we've created this temporary, mark it read only so it's no
- * longer considered an lvalue.
- */
- var->read_only = true;
-
- return new(ctx) ir_dereference_variable(var);
-}
-
-
-ir_rvalue *
-ast_node::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- (void) instructions;
- (void) state;
-
- return NULL;
-}
-
-static ir_rvalue *
-do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
-{
- int join_op;
- ir_rvalue *cmp = NULL;
-
- if (operation == ir_binop_all_equal)
- join_op = ir_binop_logic_and;
- else
- join_op = ir_binop_logic_or;
-
- switch (op0->type->base_type) {
- case GLSL_TYPE_FLOAT:
- case GLSL_TYPE_UINT:
- case GLSL_TYPE_INT:
- case GLSL_TYPE_BOOL:
- return new(mem_ctx) ir_expression(operation, op0, op1);
-
- case GLSL_TYPE_ARRAY: {
- for (unsigned int i = 0; i < op0->type->length; i++) {
- ir_rvalue *e0, *e1, *result;
-
- e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL),
- new(mem_ctx) ir_constant(i));
- e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL),
- new(mem_ctx) ir_constant(i));
- result = do_comparison(mem_ctx, operation, e0, e1);
-
- if (cmp) {
- cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
- } else {
- cmp = result;
- }
- }
-
- mark_whole_array_access(op0);
- mark_whole_array_access(op1);
- break;
- }
-
- case GLSL_TYPE_STRUCT: {
- for (unsigned int i = 0; i < op0->type->length; i++) {
- ir_rvalue *e0, *e1, *result;
- const char *field_name = op0->type->fields.structure[i].name;
-
- e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL),
- field_name);
- e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL),
- field_name);
- result = do_comparison(mem_ctx, operation, e0, e1);
-
- if (cmp) {
- cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
- } else {
- cmp = result;
- }
- }
- break;
- }
-
- case GLSL_TYPE_ERROR:
- case GLSL_TYPE_VOID:
- case GLSL_TYPE_SAMPLER:
- /* I assume a comparison of a struct containing a sampler just
- * ignores the sampler present in the type.
- */
- break;
-
- default:
- assert(!"Should not get here.");
- break;
- }
-
- if (cmp == NULL)
- cmp = new(mem_ctx) ir_constant(true);
-
- return cmp;
-}
-
-/* For logical operations, we want to ensure that the operands are
- * scalar booleans. If it isn't, emit an error and return a constant
- * boolean to avoid triggering cascading error messages.
- */
-ir_rvalue *
-get_scalar_boolean_operand(exec_list *instructions,
- struct _mesa_glsl_parse_state *state,
- ast_expression *parent_expr,
- int operand,
- const char *operand_name,
- bool *error_emitted)
-{
- ast_expression *expr = parent_expr->subexpressions[operand];
- void *ctx = state;
- ir_rvalue *val = expr->hir(instructions, state);
-
- if (val->type->is_boolean() && val->type->is_scalar())
- return val;
-
- if (!*error_emitted) {
- YYLTYPE loc = expr->get_location();
- _mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean",
- operand_name,
- parent_expr->operator_string(parent_expr->oper));
- *error_emitted = true;
- }
-
- return new(ctx) ir_constant(true);
-}
-
-/**
- * If name refers to a builtin array whose maximum allowed size is less than
- * size, report an error and return true. Otherwise return false.
- */
-static bool
-check_builtin_array_max_size(const char *name, unsigned size,
- YYLTYPE loc, struct _mesa_glsl_parse_state *state)
-{
- if ((strcmp("gl_TexCoord", name) == 0)
- && (size > state->Const.MaxTextureCoords)) {
- /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
- *
- * "The size [of gl_TexCoord] can be at most
- * gl_MaxTextureCoords."
- */
- _mesa_glsl_error(&loc, state, "`gl_TexCoord' array size cannot "
- "be larger than gl_MaxTextureCoords (%u)\n",
- state->Const.MaxTextureCoords);
- return true;
- } else if (strcmp("gl_ClipDistance", name) == 0
- && size > state->Const.MaxClipPlanes) {
- /* From section 7.1 (Vertex Shader Special Variables) of the
- * GLSL 1.30 spec:
- *
- * "The gl_ClipDistance array is predeclared as unsized and
- * must be sized by the shader either redeclaring it with a
- * size or indexing it only with integral constant
- * expressions. ... The size can be at most
- * gl_MaxClipDistances."
- */
- _mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
- "be larger than gl_MaxClipDistances (%u)\n",
- state->Const.MaxClipPlanes);
- return true;
- }
- return false;
-}
-
-ir_rvalue *
-ast_expression::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- void *ctx = state;
- static const int operations[AST_NUM_OPERATORS] = {
- -1, /* ast_assign doesn't convert to ir_expression. */
- -1, /* ast_plus doesn't convert to ir_expression. */
- ir_unop_neg,
- ir_binop_add,
- ir_binop_sub,
- ir_binop_mul,
- ir_binop_div,
- ir_binop_mod,
- ir_binop_lshift,
- ir_binop_rshift,
- ir_binop_less,
- ir_binop_greater,
- ir_binop_lequal,
- ir_binop_gequal,
- ir_binop_all_equal,
- ir_binop_any_nequal,
- ir_binop_bit_and,
- ir_binop_bit_xor,
- ir_binop_bit_or,
- ir_unop_bit_not,
- ir_binop_logic_and,
- ir_binop_logic_xor,
- ir_binop_logic_or,
- ir_unop_logic_not,
-
- /* Note: The following block of expression types actually convert
- * to multiple IR instructions.
- */
- ir_binop_mul, /* ast_mul_assign */
- ir_binop_div, /* ast_div_assign */
- ir_binop_mod, /* ast_mod_assign */
- ir_binop_add, /* ast_add_assign */
- ir_binop_sub, /* ast_sub_assign */
- ir_binop_lshift, /* ast_ls_assign */
- ir_binop_rshift, /* ast_rs_assign */
- ir_binop_bit_and, /* ast_and_assign */
- ir_binop_bit_xor, /* ast_xor_assign */
- ir_binop_bit_or, /* ast_or_assign */
-
- -1, /* ast_conditional doesn't convert to ir_expression. */
- ir_binop_add, /* ast_pre_inc. */
- ir_binop_sub, /* ast_pre_dec. */
- ir_binop_add, /* ast_post_inc. */
- ir_binop_sub, /* ast_post_dec. */
- -1, /* ast_field_selection doesn't conv to ir_expression. */
- -1, /* ast_array_index doesn't convert to ir_expression. */
- -1, /* ast_function_call doesn't conv to ir_expression. */
- -1, /* ast_identifier doesn't convert to ir_expression. */
- -1, /* ast_int_constant doesn't convert to ir_expression. */
- -1, /* ast_uint_constant doesn't conv to ir_expression. */
- -1, /* ast_float_constant doesn't conv to ir_expression. */
- -1, /* ast_bool_constant doesn't conv to ir_expression. */
- -1, /* ast_sequence doesn't convert to ir_expression. */
- };
- ir_rvalue *result = NULL;
- ir_rvalue *op[3];
- const struct glsl_type *type; /* a temporary variable for switch cases */
- bool error_emitted = false;
- YYLTYPE loc;
-
- loc = this->get_location();
-
- switch (this->oper) {
- case ast_assign: {
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
-
- result = do_assignment(instructions, state, op[0], op[1], false,
- this->subexpressions[0]->get_location());
- error_emitted = result->type->is_error();
- break;
- }
-
- case ast_plus:
- op[0] = this->subexpressions[0]->hir(instructions, state);
-
- type = unary_arithmetic_result_type(op[0]->type, state, & loc);
-
- error_emitted = type->is_error();
-
- result = op[0];
- break;
-
- case ast_neg:
- op[0] = this->subexpressions[0]->hir(instructions, state);
-
- type = unary_arithmetic_result_type(op[0]->type, state, & loc);
-
- error_emitted = type->is_error();
-
- result = new(ctx) ir_expression(operations[this->oper], type,
- op[0], NULL);
- break;
-
- case ast_add:
- case ast_sub:
- case ast_mul:
- case ast_div:
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
-
- type = arithmetic_result_type(op[0], op[1],
- (this->oper == ast_mul),
- state, & loc);
- error_emitted = type->is_error();
-
- result = new(ctx) ir_expression(operations[this->oper], type,
- op[0], op[1]);
- break;
-
- case ast_mod:
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
-
- type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
-
- assert(operations[this->oper] == ir_binop_mod);
-
- result = new(ctx) ir_expression(operations[this->oper], type,
- op[0], op[1]);
- error_emitted = type->is_error();
- break;
-
- case ast_lshift:
- case ast_rshift:
- if (state->language_version < 130) {
- _mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30",
- operator_string(this->oper));
- error_emitted = true;
- }
-
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
- type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
- &loc);
- result = new(ctx) ir_expression(operations[this->oper], type,
- op[0], op[1]);
- error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
- break;
-
- case ast_less:
- case ast_greater:
- case ast_lequal:
- case ast_gequal:
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
-
- type = relational_result_type(op[0], op[1], state, & loc);
-
- /* The relational operators must either generate an error or result
- * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
- */
- assert(type->is_error()
- || ((type->base_type == GLSL_TYPE_BOOL)
- && type->is_scalar()));
-
- result = new(ctx) ir_expression(operations[this->oper], type,
- op[0], op[1]);
- error_emitted = type->is_error();
- break;
-
- case ast_nequal:
- case ast_equal:
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
-
- /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
- *
- * "The equality operators equal (==), and not equal (!=)
- * operate on all types. They result in a scalar Boolean. If
- * the operand types do not match, then there must be a
- * conversion from Section 4.1.10 "Implicit Conversions"
- * applied to one operand that can make them match, in which
- * case this conversion is done."
- */
- if ((!apply_implicit_conversion(op[0]->type, op[1], state)
- && !apply_implicit_conversion(op[1]->type, op[0], state))
- || (op[0]->type != op[1]->type)) {
- _mesa_glsl_error(& loc, state, "operands of `%s' must have the same "
- "type", (this->oper == ast_equal) ? "==" : "!=");
- error_emitted = true;
- } else if ((state->language_version <= 110)
- && (op[0]->type->is_array() || op[1]->type->is_array())) {
- _mesa_glsl_error(& loc, state, "array comparisons forbidden in "
- "GLSL 1.10");
- error_emitted = true;
- }
-
- if (error_emitted) {
- result = new(ctx) ir_constant(false);
- } else {
- result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
- assert(result->type == glsl_type::bool_type);
- }
- break;
-
- case ast_bit_and:
- case ast_bit_xor:
- case ast_bit_or:
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
- type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
- state, &loc);
- result = new(ctx) ir_expression(operations[this->oper], type,
- op[0], op[1]);
- error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
- break;
-
- case ast_bit_not:
- op[0] = this->subexpressions[0]->hir(instructions, state);
-
- if (state->language_version < 130) {
- _mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30");
- error_emitted = true;
- }
-
- if (!op[0]->type->is_integer()) {
- _mesa_glsl_error(&loc, state, "operand of `~' must be an integer");
- error_emitted = true;
- }
-
- type = op[0]->type;
- result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL);
- break;
-
- case ast_logic_and: {
- exec_list rhs_instructions;
- op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
- "LHS", &error_emitted);
- op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
- "RHS", &error_emitted);
-
- ir_constant *op0_const = op[0]->constant_expression_value();
- if (op0_const) {
- if (op0_const->value.b[0]) {
- instructions->append_list(&rhs_instructions);
- result = op[1];
- } else {
- result = op0_const;
- }
- type = glsl_type::bool_type;
- } else {
- ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
- "and_tmp",
- ir_var_temporary);
- instructions->push_tail(tmp);
-
- ir_if *const stmt = new(ctx) ir_if(op[0]);
- instructions->push_tail(stmt);
-
- stmt->then_instructions.append_list(&rhs_instructions);
- ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
- ir_assignment *const then_assign =
- new(ctx) ir_assignment(then_deref, op[1], NULL);
- stmt->then_instructions.push_tail(then_assign);
-
- ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
- ir_assignment *const else_assign =
- new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false), NULL);
- stmt->else_instructions.push_tail(else_assign);
-
- result = new(ctx) ir_dereference_variable(tmp);
- type = tmp->type;
- }
- break;
- }
-
- case ast_logic_or: {
- exec_list rhs_instructions;
- op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
- "LHS", &error_emitted);
- op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
- "RHS", &error_emitted);
-
- ir_constant *op0_const = op[0]->constant_expression_value();
- if (op0_const) {
- if (op0_const->value.b[0]) {
- result = op0_const;
- } else {
- result = op[1];
- }
- type = glsl_type::bool_type;
- } else {
- ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
- "or_tmp",
- ir_var_temporary);
- instructions->push_tail(tmp);
-
- ir_if *const stmt = new(ctx) ir_if(op[0]);
- instructions->push_tail(stmt);
-
- ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
- ir_assignment *const then_assign =
- new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true), NULL);
- stmt->then_instructions.push_tail(then_assign);
-
- stmt->else_instructions.append_list(&rhs_instructions);
- ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
- ir_assignment *const else_assign =
- new(ctx) ir_assignment(else_deref, op[1], NULL);
- stmt->else_instructions.push_tail(else_assign);
-
- result = new(ctx) ir_dereference_variable(tmp);
- type = tmp->type;
- }
- break;
- }
-
- case ast_logic_xor:
- /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
- *
- * "The logical binary operators and (&&), or ( | | ), and
- * exclusive or (^^). They operate only on two Boolean
- * expressions and result in a Boolean expression."
- */
- op[0] = get_scalar_boolean_operand(instructions, state, this, 0, "LHS",
- &error_emitted);
- op[1] = get_scalar_boolean_operand(instructions, state, this, 1, "RHS",
- &error_emitted);
-
- result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
- op[0], op[1]);
- break;
-
- case ast_logic_not:
- op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
- "operand", &error_emitted);
-
- result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
- op[0], NULL);
- break;
-
- case ast_mul_assign:
- case ast_div_assign:
- case ast_add_assign:
- case ast_sub_assign: {
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
-
- type = arithmetic_result_type(op[0], op[1],
- (this->oper == ast_mul_assign),
- state, & loc);
-
- ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
- op[0], op[1]);
-
- result = do_assignment(instructions, state,
- op[0]->clone(ctx, NULL), temp_rhs, false,
- this->subexpressions[0]->get_location());
- error_emitted = (op[0]->type->is_error());
-
- /* GLSL 1.10 does not allow array assignment. However, we don't have to
- * explicitly test for this because none of the binary expression
- * operators allow array operands either.
- */
-
- break;
- }
-
- case ast_mod_assign: {
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
-
- type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
-
- assert(operations[this->oper] == ir_binop_mod);
-
- ir_rvalue *temp_rhs;
- temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
- op[0], op[1]);
-
- result = do_assignment(instructions, state,
- op[0]->clone(ctx, NULL), temp_rhs, false,
- this->subexpressions[0]->get_location());
- error_emitted = type->is_error();
- break;
- }
-
- case ast_ls_assign:
- case ast_rs_assign: {
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
- type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
- &loc);
- ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
- type, op[0], op[1]);
- result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
- temp_rhs, false,
- this->subexpressions[0]->get_location());
- error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
- break;
- }
-
- case ast_and_assign:
- case ast_xor_assign:
- case ast_or_assign: {
- op[0] = this->subexpressions[0]->hir(instructions, state);
- op[1] = this->subexpressions[1]->hir(instructions, state);
- type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
- state, &loc);
- ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
- type, op[0], op[1]);
- result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
- temp_rhs, false,
- this->subexpressions[0]->get_location());
- error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
- break;
- }
-
- case ast_conditional: {
- /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
- *
- * "The ternary selection operator (?:). It operates on three
- * expressions (exp1 ? exp2 : exp3). This operator evaluates the
- * first expression, which must result in a scalar Boolean."
- */
- op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
- "condition", &error_emitted);
-
- /* The :? operator is implemented by generating an anonymous temporary
- * followed by an if-statement. The last instruction in each branch of
- * the if-statement assigns a value to the anonymous temporary. This
- * temporary is the r-value of the expression.
- */
- exec_list then_instructions;
- exec_list else_instructions;
-
- op[1] = this->subexpressions[1]->hir(&then_instructions, state);
- op[2] = this->subexpressions[2]->hir(&else_instructions, state);
-
- /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
- *
- * "The second and third expressions can be any type, as
- * long their types match, or there is a conversion in
- * Section 4.1.10 "Implicit Conversions" that can be applied
- * to one of the expressions to make their types match. This
- * resulting matching type is the type of the entire
- * expression."
- */
- if ((!apply_implicit_conversion(op[1]->type, op[2], state)
- && !apply_implicit_conversion(op[2]->type, op[1], state))
- || (op[1]->type != op[2]->type)) {
- YYLTYPE loc = this->subexpressions[1]->get_location();
-
- _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
- "operator must have matching types.");
- error_emitted = true;
- type = glsl_type::error_type;
- } else {
- type = op[1]->type;
- }
-
- /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
- *
- * "The second and third expressions must be the same type, but can
- * be of any type other than an array."
- */
- if ((state->language_version <= 110) && type->is_array()) {
- _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
- "operator must not be arrays.");
- error_emitted = true;
- }
-
- ir_constant *cond_val = op[0]->constant_expression_value();
- ir_constant *then_val = op[1]->constant_expression_value();
- ir_constant *else_val = op[2]->constant_expression_value();
-
- if (then_instructions.is_empty()
- && else_instructions.is_empty()
- && (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) {
- result = (cond_val->value.b[0]) ? then_val : else_val;
- } else {
- ir_variable *const tmp =
- new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary);
- instructions->push_tail(tmp);
-
- ir_if *const stmt = new(ctx) ir_if(op[0]);
- instructions->push_tail(stmt);
-
- then_instructions.move_nodes_to(& stmt->then_instructions);
- ir_dereference *const then_deref =
- new(ctx) ir_dereference_variable(tmp);
- ir_assignment *const then_assign =
- new(ctx) ir_assignment(then_deref, op[1], NULL);
- stmt->then_instructions.push_tail(then_assign);
-
- else_instructions.move_nodes_to(& stmt->else_instructions);
- ir_dereference *const else_deref =
- new(ctx) ir_dereference_variable(tmp);
- ir_assignment *const else_assign =
- new(ctx) ir_assignment(else_deref, op[2], NULL);
- stmt->else_instructions.push_tail(else_assign);
-
- result = new(ctx) ir_dereference_variable(tmp);
- }
- break;
- }
-
- case ast_pre_inc:
- case ast_pre_dec: {
- op[0] = this->subexpressions[0]->hir(instructions, state);
- if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
- op[1] = new(ctx) ir_constant(1.0f);
- else
- op[1] = new(ctx) ir_constant(1);
-
- type = arithmetic_result_type(op[0], op[1], false, state, & loc);
-
- ir_rvalue *temp_rhs;
- temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
- op[0], op[1]);
-
- result = do_assignment(instructions, state,
- op[0]->clone(ctx, NULL), temp_rhs, false,
- this->subexpressions[0]->get_location());
- error_emitted = op[0]->type->is_error();
- break;
- }
-
- case ast_post_inc:
- case ast_post_dec: {
- op[0] = this->subexpressions[0]->hir(instructions, state);
- if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
- op[1] = new(ctx) ir_constant(1.0f);
- else
- op[1] = new(ctx) ir_constant(1);
-
- error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
-
- type = arithmetic_result_type(op[0], op[1], false, state, & loc);
-
- ir_rvalue *temp_rhs;
- temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
- op[0], op[1]);
-
- /* Get a temporary of a copy of the lvalue before it's modified.
- * This may get thrown away later.
- */
- result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL));
-
- (void)do_assignment(instructions, state,
- op[0]->clone(ctx, NULL), temp_rhs, false,
- this->subexpressions[0]->get_location());
-
- error_emitted = op[0]->type->is_error();
- break;
- }
-
- case ast_field_selection:
- result = _mesa_ast_field_selection_to_hir(this, instructions, state);
- break;
-
- case ast_array_index: {
- YYLTYPE index_loc = subexpressions[1]->get_location();
-
- op[0] = subexpressions[0]->hir(instructions, state);
- op[1] = subexpressions[1]->hir(instructions, state);
-
- error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
-
- ir_rvalue *const array = op[0];
-
- result = new(ctx) ir_dereference_array(op[0], op[1]);
-
- /* Do not use op[0] after this point. Use array.
- */
- op[0] = NULL;
-
-
- if (error_emitted)
- break;
-
- if (!array->type->is_array()
- && !array->type->is_matrix()
- && !array->type->is_vector()) {
- _mesa_glsl_error(& index_loc, state,
- "cannot dereference non-array / non-matrix / "
- "non-vector");
- error_emitted = true;
- }
-
- if (!op[1]->type->is_integer()) {
- _mesa_glsl_error(& index_loc, state,
- "array index must be integer type");
- error_emitted = true;
- } else if (!op[1]->type->is_scalar()) {
- _mesa_glsl_error(& index_loc, state,
- "array index must be scalar");
- error_emitted = true;
- }
-
- /* If the array index is a constant expression and the array has a
- * declared size, ensure that the access is in-bounds. If the array
- * index is not a constant expression, ensure that the array has a
- * declared size.
- */
- ir_constant *const const_index = op[1]->constant_expression_value();
- if (const_index != NULL) {
- const int idx = const_index->value.i[0];
- const char *type_name;
- unsigned bound = 0;
-
- if (array->type->is_matrix()) {
- type_name = "matrix";
- } else if (array->type->is_vector()) {
- type_name = "vector";
- } else {
- type_name = "array";
- }
-
- /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
- *
- * "It is illegal to declare an array with a size, and then
- * later (in the same shader) index the same array with an
- * integral constant expression greater than or equal to the
- * declared size. It is also illegal to index an array with a
- * negative constant expression."
- */
- if (array->type->is_matrix()) {
- if (array->type->row_type()->vector_elements <= idx) {
- bound = array->type->row_type()->vector_elements;
- }
- } else if (array->type->is_vector()) {
- if (array->type->vector_elements <= idx) {
- bound = array->type->vector_elements;
- }
- } else {
- if ((array->type->array_size() > 0)
- && (array->type->array_size() <= idx)) {
- bound = array->type->array_size();
- }
- }
-
- if (bound > 0) {
- _mesa_glsl_error(& loc, state, "%s index must be < %u",
- type_name, bound);
- error_emitted = true;
- } else if (idx < 0) {
- _mesa_glsl_error(& loc, state, "%s index must be >= 0",
- type_name);
- error_emitted = true;
- }
-
- if (array->type->is_array()) {
- /* If the array is a variable dereference, it dereferences the
- * whole array, by definition. Use this to get the variable.
- *
- * FINISHME: Should some methods for getting / setting / testing
- * FINISHME: array access limits be added to ir_dereference?
- */
- ir_variable *const v = array->whole_variable_referenced();
- if ((v != NULL) && (unsigned(idx) > v->max_array_access)) {
- v->max_array_access = idx;
-
- /* Check whether this access will, as a side effect, implicitly
- * cause the size of a built-in array to be too large.
- */
- if (check_builtin_array_max_size(v->name, idx+1, loc, state))
- error_emitted = true;
- }
- }
- } else if (array->type->array_size() == 0) {
- _mesa_glsl_error(&loc, state, "unsized array index must be constant");
- } else {
- if (array->type->is_array()) {
- /* whole_variable_referenced can return NULL if the array is a
- * member of a structure. In this case it is safe to not update
- * the max_array_access field because it is never used for fields
- * of structures.
- */
- ir_variable *v = array->whole_variable_referenced();
- if (v != NULL)
- v->max_array_access = array->type->array_size() - 1;
- }
- }
-
- /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
- *
- * "Samplers aggregated into arrays within a shader (using square
- * brackets [ ]) can only be indexed with integral constant
- * expressions [...]."
- *
- * This restriction was added in GLSL 1.30. Shaders using earlier version
- * of the language should not be rejected by the compiler front-end for
- * using this construct. This allows useful things such as using a loop
- * counter as the index to an array of samplers. If the loop in unrolled,
- * the code should compile correctly. Instead, emit a warning.
- */
- if (array->type->is_array() &&
- array->type->element_type()->is_sampler() &&
- const_index == NULL) {
-
- if (state->language_version == 100) {
- _mesa_glsl_warning(&loc, state,
- "sampler arrays indexed with non-constant "
- "expressions is optional in GLSL ES 1.00");
- } else if (state->language_version < 130) {
- _mesa_glsl_warning(&loc, state,
- "sampler arrays indexed with non-constant "
- "expressions is forbidden in GLSL 1.30 and "
- "later");
- } else {
- _mesa_glsl_error(&loc, state,
- "sampler arrays indexed with non-constant "
- "expressions is forbidden in GLSL 1.30 and "
- "later");
- error_emitted = true;
- }
- }
-
- if (error_emitted)
- result->type = glsl_type::error_type;
-
- break;
- }
-
- case ast_function_call:
- /* Should *NEVER* get here. ast_function_call should always be handled
- * by ast_function_expression::hir.
- */
- assert(0);
- break;
-
- case ast_identifier: {
- /* ast_identifier can appear several places in a full abstract syntax
- * tree. This particular use must be at location specified in the grammar
- * as 'variable_identifier'.
- */
- ir_variable *var =
- state->symbols->get_variable(this->primary_expression.identifier);
-
- result = new(ctx) ir_dereference_variable(var);
-
- if (var != NULL) {
- var->used = true;
- } else {
- _mesa_glsl_error(& loc, state, "`%s' undeclared",
- this->primary_expression.identifier);
-
- error_emitted = true;
- }
- break;
- }
-
- case ast_int_constant:
- result = new(ctx) ir_constant(this->primary_expression.int_constant);
- break;
-
- case ast_uint_constant:
- result = new(ctx) ir_constant(this->primary_expression.uint_constant);
- break;
-
- case ast_float_constant:
- result = new(ctx) ir_constant(this->primary_expression.float_constant);
- break;
-
- case ast_bool_constant:
- result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant));
- break;
-
- case ast_sequence: {
- /* It should not be possible to generate a sequence in the AST without
- * any expressions in it.
- */
- assert(!this->expressions.is_empty());
-
- /* The r-value of a sequence is the last expression in the sequence. If
- * the other expressions in the sequence do not have side-effects (and
- * therefore add instructions to the instruction list), they get dropped
- * on the floor.
- */
- exec_node *previous_tail_pred = NULL;
- YYLTYPE previous_operand_loc = loc;
-
- foreach_list_typed (ast_node, ast, link, &this->expressions) {
- /* If one of the operands of comma operator does not generate any
- * code, we want to emit a warning. At each pass through the loop
- * previous_tail_pred will point to the last instruction in the
- * stream *before* processing the previous operand. Naturally,
- * instructions->tail_pred will point to the last instruction in the
- * stream *after* processing the previous operand. If the two
- * pointers match, then the previous operand had no effect.
- *
- * The warning behavior here differs slightly from GCC. GCC will
- * only emit a warning if none of the left-hand operands have an
- * effect. However, it will emit a warning for each. I believe that
- * there are some cases in C (especially with GCC extensions) where
- * it is useful to have an intermediate step in a sequence have no
- * effect, but I don't think these cases exist in GLSL. Either way,
- * it would be a giant hassle to replicate that behavior.
- */
- if (previous_tail_pred == instructions->tail_pred) {
- _mesa_glsl_warning(&previous_operand_loc, state,
- "left-hand operand of comma expression has "
- "no effect");
- }
-
- /* tail_pred is directly accessed instead of using the get_tail()
- * method for performance reasons. get_tail() has extra code to
- * return NULL when the list is empty. We don't care about that
- * here, so using tail_pred directly is fine.
- */
- previous_tail_pred = instructions->tail_pred;
- previous_operand_loc = ast->get_location();
-
- result = ast->hir(instructions, state);
- }
-
- /* Any errors should have already been emitted in the loop above.
- */
- error_emitted = true;
- break;
- }
- }
- type = NULL; /* use result->type, not type. */
- assert(result != NULL);
-
- if (result->type->is_error() && !error_emitted)
- _mesa_glsl_error(& loc, state, "type mismatch");
-
- return result;
-}
-
-
-ir_rvalue *
-ast_expression_statement::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- /* It is possible to have expression statements that don't have an
- * expression. This is the solitary semicolon:
- *
- * for (i = 0; i < 5; i++)
- * ;
- *
- * In this case the expression will be NULL. Test for NULL and don't do
- * anything in that case.
- */
- if (expression != NULL)
- expression->hir(instructions, state);
-
- /* Statements do not have r-values.
- */
- return NULL;
-}
-
-
-ir_rvalue *
-ast_compound_statement::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- if (new_scope)
- state->symbols->push_scope();
-
- foreach_list_typed (ast_node, ast, link, &this->statements)
- ast->hir(instructions, state);
-
- if (new_scope)
- state->symbols->pop_scope();
-
- /* Compound statements do not have r-values.
- */
- return NULL;
-}
-
-
-static const glsl_type *
-process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size,
- struct _mesa_glsl_parse_state *state)
-{
- unsigned length = 0;
-
- /* FINISHME: Reject delcarations of multidimensional arrays. */
-
- if (array_size != NULL) {
- exec_list dummy_instructions;
- ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
- YYLTYPE loc = array_size->get_location();
-
- if (ir != NULL) {
- if (!ir->type->is_integer()) {
- _mesa_glsl_error(& loc, state, "array size must be integer type");
- } else if (!ir->type->is_scalar()) {
- _mesa_glsl_error(& loc, state, "array size must be scalar type");
- } else {
- ir_constant *const size = ir->constant_expression_value();
-
- if (size == NULL) {
- _mesa_glsl_error(& loc, state, "array size must be a "
- "constant valued expression");
- } else if (size->value.i[0] <= 0) {
- _mesa_glsl_error(& loc, state, "array size must be > 0");
- } else {
- assert(size->type == ir->type);
- length = size->value.u[0];
-
- /* If the array size is const (and we've verified that
- * it is) then no instructions should have been emitted
- * when we converted it to HIR. If they were emitted,
- * then either the array size isn't const after all, or
- * we are emitting unnecessary instructions.
- */
- assert(dummy_instructions.is_empty());
- }
- }
- }
- } else if (state->es_shader) {
- /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
- * array declarations have been removed from the language.
- */
- _mesa_glsl_error(loc, state, "unsized array declarations are not "
- "allowed in GLSL ES 1.00.");
- }
-
- return glsl_type::get_array_instance(base, length);
-}
-
-
-const glsl_type *
-ast_type_specifier::glsl_type(const char **name,
- struct _mesa_glsl_parse_state *state) const
-{
- const struct glsl_type *type;
-
- type = state->symbols->get_type(this->type_name);
- *name = this->type_name;
-
- if (this->is_array) {
- YYLTYPE loc = this->get_location();
- type = process_array_type(&loc, type, this->array_size, state);
- }
-
- return type;
-}
-
-
-static void
-apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
- ir_variable *var,
- struct _mesa_glsl_parse_state *state,
- YYLTYPE *loc)
-{
- if (qual->flags.q.invariant) {
- if (var->used) {
- _mesa_glsl_error(loc, state,
- "variable `%s' may not be redeclared "
- "`invariant' after being used",
- var->name);
- } else {
- var->invariant = 1;
- }
- }
-
- if (qual->flags.q.constant || qual->flags.q.attribute
- || qual->flags.q.uniform
- || (qual->flags.q.varying && (state->target == fragment_shader)))
- var->read_only = 1;
-
- if (qual->flags.q.centroid)
- var->centroid = 1;
-
- if (qual->flags.q.attribute && state->target != vertex_shader) {
- var->type = glsl_type::error_type;
- _mesa_glsl_error(loc, state,
- "`attribute' variables may not be declared in the "
- "%s shader",
- _mesa_glsl_shader_target_name(state->target));
- }
-
- /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
- *
- * "The varying qualifier can be used only with the data types
- * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
- * these."
- */
- if (qual->flags.q.varying) {
- const glsl_type *non_array_type;
-
- if (var->type && var->type->is_array())
- non_array_type = var->type->fields.array;
- else
- non_array_type = var->type;
-
- if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) {
- var->type = glsl_type::error_type;
- _mesa_glsl_error(loc, state,
- "varying variables must be of base type float");
- }
- }
-
- /* If there is no qualifier that changes the mode of the variable, leave
- * the setting alone.
- */
- if (qual->flags.q.in && qual->flags.q.out)
- var->mode = ir_var_inout;
- else if (qual->flags.q.attribute || qual->flags.q.in
- || (qual->flags.q.varying && (state->target == fragment_shader)))
- var->mode = ir_var_in;
- else if (qual->flags.q.out
- || (qual->flags.q.varying && (state->target == vertex_shader)))
- var->mode = ir_var_out;
- else if (qual->flags.q.uniform)
- var->mode = ir_var_uniform;
-
- if (state->all_invariant && (state->current_function == NULL)) {
- switch (state->target) {
- case vertex_shader:
- if (var->mode == ir_var_out)
- var->invariant = true;
- break;
- case geometry_shader:
- if ((var->mode == ir_var_in) || (var->mode == ir_var_out))
- var->invariant = true;
- break;
- case fragment_shader:
- if (var->mode == ir_var_in)
- var->invariant = true;
- break;
- }
- }
-
- if (qual->flags.q.flat)
- var->interpolation = ir_var_flat;
- else if (qual->flags.q.noperspective)
- var->interpolation = ir_var_noperspective;
- else
- var->interpolation = ir_var_smooth;
-
- var->pixel_center_integer = qual->flags.q.pixel_center_integer;
- var->origin_upper_left = qual->flags.q.origin_upper_left;
- if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer)
- && (strcmp(var->name, "gl_FragCoord") != 0)) {
- const char *const qual_string = (qual->flags.q.origin_upper_left)
- ? "origin_upper_left" : "pixel_center_integer";
-
- _mesa_glsl_error(loc, state,
- "layout qualifier `%s' can only be applied to "
- "fragment shader input `gl_FragCoord'",
- qual_string);
- }
-
- if (qual->flags.q.explicit_location) {
- const bool global_scope = (state->current_function == NULL);
- bool fail = false;
- const char *string = "";
-
- /* In the vertex shader only shader inputs can be given explicit
- * locations.
- *
- * In the fragment shader only shader outputs can be given explicit
- * locations.
- */
- switch (state->target) {
- case vertex_shader:
- if (!global_scope || (var->mode != ir_var_in)) {
- fail = true;
- string = "input";
- }
- break;
-
- case geometry_shader:
- _mesa_glsl_error(loc, state,
- "geometry shader variables cannot be given "
- "explicit locations\n");
- break;
-
- case fragment_shader:
- if (!global_scope || (var->mode != ir_var_out)) {
- fail = true;
- string = "output";
- }
- break;
- };
-
- if (fail) {
- _mesa_glsl_error(loc, state,
- "only %s shader %s variables can be given an "
- "explicit location\n",
- _mesa_glsl_shader_target_name(state->target),
- string);
- } else {
- var->explicit_location = true;
-
- /* This bit of silliness is needed because invalid explicit locations
- * are supposed to be flagged during linking. Small negative values
- * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
- * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
- * The linker needs to be able to differentiate these cases. This
- * ensures that negative values stay negative.
- */
- if (qual->location >= 0) {
- var->location = (state->target == vertex_shader)
- ? (qual->location + VERT_ATTRIB_GENERIC0)
- : (qual->location + FRAG_RESULT_DATA0);
- } else {
- var->location = qual->location;
- }
- }
- }
-
- /* Does the declaration use the 'layout' keyword?
- */
- const bool uses_layout = qual->flags.q.pixel_center_integer
- || qual->flags.q.origin_upper_left
- || qual->flags.q.explicit_location;
-
- /* Does the declaration use the deprecated 'attribute' or 'varying'
- * keywords?
- */
- const bool uses_deprecated_qualifier = qual->flags.q.attribute
- || qual->flags.q.varying;
-
- /* Is the 'layout' keyword used with parameters that allow relaxed checking.
- * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
- * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
- * allowed the layout qualifier to be used with 'varying' and 'attribute'.
- * These extensions and all following extensions that add the 'layout'
- * keyword have been modified to require the use of 'in' or 'out'.
- *
- * The following extension do not allow the deprecated keywords:
- *
- * GL_AMD_conservative_depth
- * GL_ARB_gpu_shader5
- * GL_ARB_separate_shader_objects
- * GL_ARB_tesselation_shader
- * GL_ARB_transform_feedback3
- * GL_ARB_uniform_buffer_object
- *
- * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
- * allow layout with the deprecated keywords.
- */
- const bool relaxed_layout_qualifier_checking =
- state->ARB_fragment_coord_conventions_enable;
-
- if (uses_layout && uses_deprecated_qualifier) {
- if (relaxed_layout_qualifier_checking) {
- _mesa_glsl_warning(loc, state,
- "`layout' qualifier may not be used with "
- "`attribute' or `varying'");
- } else {
- _mesa_glsl_error(loc, state,
- "`layout' qualifier may not be used with "
- "`attribute' or `varying'");
- }
- }
-
- /* Layout qualifiers for gl_FragDepth, which are enabled by extension
- * AMD_conservative_depth.
- */
- int depth_layout_count = qual->flags.q.depth_any
- + qual->flags.q.depth_greater
- + qual->flags.q.depth_less
- + qual->flags.q.depth_unchanged;
- if (depth_layout_count > 0
- && !state->AMD_conservative_depth_enable) {
- _mesa_glsl_error(loc, state,
- "extension GL_AMD_conservative_depth must be enabled "
- "to use depth layout qualifiers");
- } else if (depth_layout_count > 0
- && strcmp(var->name, "gl_FragDepth") != 0) {
- _mesa_glsl_error(loc, state,
- "depth layout qualifiers can be applied only to "
- "gl_FragDepth");
- } else if (depth_layout_count > 1
- && strcmp(var->name, "gl_FragDepth") == 0) {
- _mesa_glsl_error(loc, state,
- "at most one depth layout qualifier can be applied to "
- "gl_FragDepth");
- }
- if (qual->flags.q.depth_any)
- var->depth_layout = ir_depth_layout_any;
- else if (qual->flags.q.depth_greater)
- var->depth_layout = ir_depth_layout_greater;
- else if (qual->flags.q.depth_less)
- var->depth_layout = ir_depth_layout_less;
- else if (qual->flags.q.depth_unchanged)
- var->depth_layout = ir_depth_layout_unchanged;
- else
- var->depth_layout = ir_depth_layout_none;
-
- /* From page 46 (page 52 of the PDF) of the GLSL ES specification:
- *
- * "Array variables are l-values and may be passed to parameters
- * declared as out or inout. However, they may not be used as
- * the target of an assignment."
- *
- * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
- *
- * "Other binary or unary expressions, non-dereferenced arrays,
- * function names, swizzles with repeated fields, and constants
- * cannot be l-values."
- *
- * So we only mark 1.10 as non-lvalues, and check for array
- * assignment in 100 specifically in do_assignment.
- */
- if (var->type->is_array() && state->language_version != 110) {
- var->array_lvalue = true;
- }
-}
-
-/**
- * Get the variable that is being redeclared by this declaration
- *
- * Semantic checks to verify the validity of the redeclaration are also
- * performed. If semantic checks fail, compilation error will be emitted via
- * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
- *
- * \returns
- * A pointer to an existing variable in the current scope if the declaration
- * is a redeclaration, \c NULL otherwise.
- */
-ir_variable *
-get_variable_being_redeclared(ir_variable *var, ast_declaration *decl,
- struct _mesa_glsl_parse_state *state)
-{
- /* Check if this declaration is actually a re-declaration, either to
- * resize an array or add qualifiers to an existing variable.
- *
- * This is allowed for variables in the current scope, or when at
- * global scope (for built-ins in the implicit outer scope).
- */
- ir_variable *earlier = state->symbols->get_variable(decl->identifier);
- if (earlier == NULL ||
- (state->current_function != NULL &&
- !state->symbols->name_declared_this_scope(decl->identifier))) {
- return NULL;
- }
-
-
- YYLTYPE loc = decl->get_location();
-
- /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
- *
- * "It is legal to declare an array without a size and then
- * later re-declare the same name as an array of the same
- * type and specify a size."
- */
- if ((earlier->type->array_size() == 0)
- && var->type->is_array()
- && (var->type->element_type() == earlier->type->element_type())) {
- /* FINISHME: This doesn't match the qualifiers on the two
- * FINISHME: declarations. It's not 100% clear whether this is
- * FINISHME: required or not.
- */
-
- const unsigned size = unsigned(var->type->array_size());
- check_builtin_array_max_size(var->name, size, loc, state);
- if ((size > 0) && (size <= earlier->max_array_access)) {
- _mesa_glsl_error(& loc, state, "array size must be > %u due to "
- "previous access",
- earlier->max_array_access);
- }
-
- earlier->type = var->type;
- delete var;
- var = NULL;
- } else if (state->ARB_fragment_coord_conventions_enable
- && strcmp(var->name, "gl_FragCoord") == 0
- && earlier->type == var->type
- && earlier->mode == var->mode) {
- /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
- * qualifiers.
- */
- earlier->origin_upper_left = var->origin_upper_left;
- earlier->pixel_center_integer = var->pixel_center_integer;
-
- /* According to section 4.3.7 of the GLSL 1.30 spec,
- * the following built-in varaibles can be redeclared with an
- * interpolation qualifier:
- * * gl_FrontColor
- * * gl_BackColor
- * * gl_FrontSecondaryColor
- * * gl_BackSecondaryColor
- * * gl_Color
- * * gl_SecondaryColor
- */
- } else if (state->language_version >= 130
- && (strcmp(var->name, "gl_FrontColor") == 0
- || strcmp(var->name, "gl_BackColor") == 0
- || strcmp(var->name, "gl_FrontSecondaryColor") == 0
- || strcmp(var->name, "gl_BackSecondaryColor") == 0
- || strcmp(var->name, "gl_Color") == 0
- || strcmp(var->name, "gl_SecondaryColor") == 0)
- && earlier->type == var->type
- && earlier->mode == var->mode) {
- earlier->interpolation = var->interpolation;
-
- /* Layout qualifiers for gl_FragDepth. */
- } else if (state->AMD_conservative_depth_enable
- && strcmp(var->name, "gl_FragDepth") == 0
- && earlier->type == var->type
- && earlier->mode == var->mode) {
-
- /** From the AMD_conservative_depth spec:
- * Within any shader, the first redeclarations of gl_FragDepth
- * must appear before any use of gl_FragDepth.
- */
- if (earlier->used) {
- _mesa_glsl_error(&loc, state,
- "the first redeclaration of gl_FragDepth "
- "must appear before any use of gl_FragDepth");
- }
-
- /* Prevent inconsistent redeclaration of depth layout qualifier. */
- if (earlier->depth_layout != ir_depth_layout_none
- && earlier->depth_layout != var->depth_layout) {
- _mesa_glsl_error(&loc, state,
- "gl_FragDepth: depth layout is declared here "
- "as '%s, but it was previously declared as "
- "'%s'",
- depth_layout_string(var->depth_layout),
- depth_layout_string(earlier->depth_layout));
- }
-
- earlier->depth_layout = var->depth_layout;
-
- } else {
- _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier);
- }
-
- return earlier;
-}
-
-/**
- * Generate the IR for an initializer in a variable declaration
- */
-ir_rvalue *
-process_initializer(ir_variable *var, ast_declaration *decl,
- ast_fully_specified_type *type,
- exec_list *initializer_instructions,
- struct _mesa_glsl_parse_state *state)
-{
- ir_rvalue *result = NULL;
-
- YYLTYPE initializer_loc = decl->initializer->get_location();
-
- /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
- *
- * "All uniform variables are read-only and are initialized either
- * directly by an application via API commands, or indirectly by
- * OpenGL."
- */
- if ((state->language_version <= 110)
- && (var->mode == ir_var_uniform)) {
- _mesa_glsl_error(& initializer_loc, state,
- "cannot initialize uniforms in GLSL 1.10");
- }
-
- if (var->type->is_sampler()) {
- _mesa_glsl_error(& initializer_loc, state,
- "cannot initialize samplers");
- }
-
- if ((var->mode == ir_var_in) && (state->current_function == NULL)) {
- _mesa_glsl_error(& initializer_loc, state,
- "cannot initialize %s shader input / %s",
- _mesa_glsl_shader_target_name(state->target),
- (state->target == vertex_shader)
- ? "attribute" : "varying");
- }
-
- ir_dereference *const lhs = new(state) ir_dereference_variable(var);
- ir_rvalue *rhs = decl->initializer->hir(initializer_instructions,
- state);
-
- /* Calculate the constant value if this is a const or uniform
- * declaration.
- */
- if (type->qualifier.flags.q.constant
- || type->qualifier.flags.q.uniform) {
- ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs, true);
- if (new_rhs != NULL) {
- rhs = new_rhs;
-
- ir_constant *constant_value = rhs->constant_expression_value();
- if (!constant_value) {
- _mesa_glsl_error(& initializer_loc, state,
- "initializer of %s variable `%s' must be a "
- "constant expression",
- (type->qualifier.flags.q.constant)
- ? "const" : "uniform",
- decl->identifier);
- if (var->type->is_numeric()) {
- /* Reduce cascading errors. */
- var->constant_value = ir_constant::zero(state, var->type);
- }
- } else {
- rhs = constant_value;
- var->constant_value = constant_value;
- }
- } else {
- _mesa_glsl_error(&initializer_loc, state,
- "initializer of type %s cannot be assigned to "
- "variable of type %s",
- rhs->type->name, var->type->name);
- if (var->type->is_numeric()) {
- /* Reduce cascading errors. */
- var->constant_value = ir_constant::zero(state, var->type);
- }
- }
- }
-
- if (rhs && !rhs->type->is_error()) {
- bool temp = var->read_only;
- if (type->qualifier.flags.q.constant)
- var->read_only = false;
-
- /* Never emit code to initialize a uniform.
- */
- const glsl_type *initializer_type;
- if (!type->qualifier.flags.q.uniform) {
- result = do_assignment(initializer_instructions, state,
- lhs, rhs, true,
- type->get_location());
- initializer_type = result->type;
- } else
- initializer_type = rhs->type;
-
- /* If the declared variable is an unsized array, it must inherrit
- * its full type from the initializer. A declaration such as
- *
- * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
- *
- * becomes
- *
- * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
- *
- * The assignment generated in the if-statement (below) will also
- * automatically handle this case for non-uniforms.
- *
- * If the declared variable is not an array, the types must
- * already match exactly. As a result, the type assignment
- * here can be done unconditionally. For non-uniforms the call
- * to do_assignment can change the type of the initializer (via
- * the implicit conversion rules). For uniforms the initializer
- * must be a constant expression, and the type of that expression
- * was validated above.
- */
- var->type = initializer_type;
-
- var->read_only = temp;
- }
-
- return result;
-}
-
-ir_rvalue *
-ast_declarator_list::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- void *ctx = state;
- const struct glsl_type *decl_type;
- const char *type_name = NULL;
- ir_rvalue *result = NULL;
- YYLTYPE loc = this->get_location();
-
- /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
- *
- * "To ensure that a particular output variable is invariant, it is
- * necessary to use the invariant qualifier. It can either be used to
- * qualify a previously declared variable as being invariant
- *
- * invariant gl_Position; // make existing gl_Position be invariant"
- *
- * In these cases the parser will set the 'invariant' flag in the declarator
- * list, and the type will be NULL.
- */
- if (this->invariant) {
- assert(this->type == NULL);
-
- if (state->current_function != NULL) {
- _mesa_glsl_error(& loc, state,
- "All uses of `invariant' keyword must be at global "
- "scope\n");
- }
-
- foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
- assert(!decl->is_array);
- assert(decl->array_size == NULL);
- assert(decl->initializer == NULL);
-
- ir_variable *const earlier =
- state->symbols->get_variable(decl->identifier);
- if (earlier == NULL) {
- _mesa_glsl_error(& loc, state,
- "Undeclared variable `%s' cannot be marked "
- "invariant\n", decl->identifier);
- } else if ((state->target == vertex_shader)
- && (earlier->mode != ir_var_out)) {
- _mesa_glsl_error(& loc, state,
- "`%s' cannot be marked invariant, vertex shader "
- "outputs only\n", decl->identifier);
- } else if ((state->target == fragment_shader)
- && (earlier->mode != ir_var_in)) {
- _mesa_glsl_error(& loc, state,
- "`%s' cannot be marked invariant, fragment shader "
- "inputs only\n", decl->identifier);
- } else if (earlier->used) {
- _mesa_glsl_error(& loc, state,
- "variable `%s' may not be redeclared "
- "`invariant' after being used",
- earlier->name);
- } else {
- earlier->invariant = true;
- }
- }
-
- /* Invariant redeclarations do not have r-values.
- */
- return NULL;
- }
-
- assert(this->type != NULL);
- assert(!this->invariant);
-
- /* The type specifier may contain a structure definition. Process that
- * before any of the variable declarations.
- */
- (void) this->type->specifier->hir(instructions, state);
-
- decl_type = this->type->specifier->glsl_type(& type_name, state);
- if (this->declarations.is_empty()) {
- if (decl_type != NULL) {
- /* Warn if this empty declaration is not for declaring a structure.
- */
- if (this->type->specifier->structure == NULL) {
- _mesa_glsl_warning(&loc, state, "empty declaration");
- }
- } else {
- _mesa_glsl_error(& loc, state, "incomplete declaration");
- }
- }
-
- foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
- const struct glsl_type *var_type;
- ir_variable *var;
-
- /* FINISHME: Emit a warning if a variable declaration shadows a
- * FINISHME: declaration at a higher scope.
- */
-
- if ((decl_type == NULL) || decl_type->is_void()) {
- if (type_name != NULL) {
- _mesa_glsl_error(& loc, state,
- "invalid type `%s' in declaration of `%s'",
- type_name, decl->identifier);
- } else {
- _mesa_glsl_error(& loc, state,
- "invalid type in declaration of `%s'",
- decl->identifier);
- }
- continue;
- }
-
- if (decl->is_array) {
- var_type = process_array_type(&loc, decl_type, decl->array_size,
- state);
- } else {
- var_type = decl_type;
- }
-
- var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto);
-
- /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
- *
- * "Global variables can only use the qualifiers const,
- * attribute, uni form, or varying. Only one may be
- * specified.
- *
- * Local variables can only use the qualifier const."
- *
- * This is relaxed in GLSL 1.30. It is also relaxed by any extension
- * that adds the 'layout' keyword.
- */
- if ((state->language_version < 130)
- && !state->ARB_explicit_attrib_location_enable
- && !state->ARB_fragment_coord_conventions_enable) {
- if (this->type->qualifier.flags.q.out) {
- _mesa_glsl_error(& loc, state,
- "`out' qualifier in declaration of `%s' "
- "only valid for function parameters in %s.",
- decl->identifier, state->version_string);
- }
- if (this->type->qualifier.flags.q.in) {
- _mesa_glsl_error(& loc, state,
- "`in' qualifier in declaration of `%s' "
- "only valid for function parameters in %s.",
- decl->identifier, state->version_string);
- }
- /* FINISHME: Test for other invalid qualifiers. */
- }
-
- apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
- & loc);
-
- if (this->type->qualifier.flags.q.invariant) {
- if ((state->target == vertex_shader) && !(var->mode == ir_var_out ||
- var->mode == ir_var_inout)) {
- /* FINISHME: Note that this doesn't work for invariant on
- * a function signature outval
- */
- _mesa_glsl_error(& loc, state,
- "`%s' cannot be marked invariant, vertex shader "
- "outputs only\n", var->name);
- } else if ((state->target == fragment_shader) &&
- !(var->mode == ir_var_in || var->mode == ir_var_inout)) {
- /* FINISHME: Note that this doesn't work for invariant on
- * a function signature inval
- */
- _mesa_glsl_error(& loc, state,
- "`%s' cannot be marked invariant, fragment shader "
- "inputs only\n", var->name);
- }
- }
-
- if (state->current_function != NULL) {
- const char *mode = NULL;
- const char *extra = "";
-
- /* There is no need to check for 'inout' here because the parser will
- * only allow that in function parameter lists.
- */
- if (this->type->qualifier.flags.q.attribute) {
- mode = "attribute";
- } else if (this->type->qualifier.flags.q.uniform) {
- mode = "uniform";
- } else if (this->type->qualifier.flags.q.varying) {
- mode = "varying";
- } else if (this->type->qualifier.flags.q.in) {
- mode = "in";
- extra = " or in function parameter list";
- } else if (this->type->qualifier.flags.q.out) {
- mode = "out";
- extra = " or in function parameter list";
- }
-
- if (mode) {
- _mesa_glsl_error(& loc, state,
- "%s variable `%s' must be declared at "
- "global scope%s",
- mode, var->name, extra);
- }
- } else if (var->mode == ir_var_in) {
- var->read_only = true;
-
- if (state->target == vertex_shader) {
- bool error_emitted = false;
-
- /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
- *
- * "Vertex shader inputs can only be float, floating-point
- * vectors, matrices, signed and unsigned integers and integer
- * vectors. Vertex shader inputs can also form arrays of these
- * types, but not structures."
- *
- * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
- *
- * "Vertex shader inputs can only be float, floating-point
- * vectors, matrices, signed and unsigned integers and integer
- * vectors. They cannot be arrays or structures."
- *
- * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
- *
- * "The attribute qualifier can be used only with float,
- * floating-point vectors, and matrices. Attribute variables
- * cannot be declared as arrays or structures."
- */
- const glsl_type *check_type = var->type->is_array()
- ? var->type->fields.array : var->type;
-
- switch (check_type->base_type) {
- case GLSL_TYPE_FLOAT:
- break;
- case GLSL_TYPE_UINT:
- case GLSL_TYPE_INT:
- if (state->language_version > 120)
- break;
- /* FALLTHROUGH */
- default:
- _mesa_glsl_error(& loc, state,
- "vertex shader input / attribute cannot have "
- "type %s`%s'",
- var->type->is_array() ? "array of " : "",
- check_type->name);
- error_emitted = true;
- }
-
- if (!error_emitted && (state->language_version <= 130)
- && var->type->is_array()) {
- _mesa_glsl_error(& loc, state,
- "vertex shader input / attribute cannot have "
- "array type");
- error_emitted = true;
- }
- }
- }
-
- /* Integer vertex outputs must be qualified with 'flat'.
- *
- * From section 4.3.6 of the GLSL 1.30 spec:
- * "If a vertex output is a signed or unsigned integer or integer
- * vector, then it must be qualified with the interpolation qualifier
- * flat."
- */
- if (state->language_version >= 130
- && state->target == vertex_shader
- && state->current_function == NULL
- && var->type->is_integer()
- && var->mode == ir_var_out
- && var->interpolation != ir_var_flat) {
-
- _mesa_glsl_error(&loc, state, "If a vertex output is an integer, "
- "then it must be qualified with 'flat'");
- }
-
-
- /* Interpolation qualifiers cannot be applied to 'centroid' and
- * 'centroid varying'.
- *
- * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
- * "interpolation qualifiers may only precede the qualifiers in,
- * centroid in, out, or centroid out in a declaration. They do not apply
- * to the deprecated storage qualifiers varying or centroid varying."
- */
- if (state->language_version >= 130
- && this->type->qualifier.has_interpolation()
- && this->type->qualifier.flags.q.varying) {
-
- const char *i = this->type->qualifier.interpolation_string();
- assert(i != NULL);
- const char *s;
- if (this->type->qualifier.flags.q.centroid)
- s = "centroid varying";
- else
- s = "varying";
-
- _mesa_glsl_error(&loc, state,
- "qualifier '%s' cannot be applied to the "
- "deprecated storage qualifier '%s'", i, s);
- }
-
-
- /* Interpolation qualifiers can only apply to vertex shader outputs and
- * fragment shader inputs.
- *
- * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
- * "Outputs from a vertex shader (out) and inputs to a fragment
- * shader (in) can be further qualified with one or more of these
- * interpolation qualifiers"
- */
- if (state->language_version >= 130
- && this->type->qualifier.has_interpolation()) {
-
- const char *i = this->type->qualifier.interpolation_string();
- assert(i != NULL);
-
- switch (state->target) {
- case vertex_shader:
- if (this->type->qualifier.flags.q.in) {
- _mesa_glsl_error(&loc, state,
- "qualifier '%s' cannot be applied to vertex "
- "shader inputs", i);
- }
- break;
- case fragment_shader:
- if (this->type->qualifier.flags.q.out) {
- _mesa_glsl_error(&loc, state,
- "qualifier '%s' cannot be applied to fragment "
- "shader outputs", i);
- }
- break;
- default:
- assert(0);
- }
- }
-
-
- /* From section 4.3.4 of the GLSL 1.30 spec:
- * "It is an error to use centroid in in a vertex shader."
- */
- if (state->language_version >= 130
- && this->type->qualifier.flags.q.centroid
- && this->type->qualifier.flags.q.in
- && state->target == vertex_shader) {
-
- _mesa_glsl_error(&loc, state,
- "'centroid in' cannot be used in a vertex shader");
- }
-
-
- /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
- */
- if (this->type->specifier->precision != ast_precision_none
- && state->language_version != 100
- && state->language_version < 130) {
-
- _mesa_glsl_error(&loc, state,
- "precision qualifiers are supported only in GLSL ES "
- "1.00, and GLSL 1.30 and later");
- }
-
-
- /* Precision qualifiers only apply to floating point and integer types.
- *
- * From section 4.5.2 of the GLSL 1.30 spec:
- * "Any floating point or any integer declaration can have the type
- * preceded by one of these precision qualifiers [...] Literal
- * constants do not have precision qualifiers. Neither do Boolean
- * variables.
- *
- * In GLSL ES, sampler types are also allowed.
- *
- * From page 87 of the GLSL ES spec:
- * "RESOLUTION: Allow sampler types to take a precision qualifier."
- */
- if (this->type->specifier->precision != ast_precision_none
- && !var->type->is_float()
- && !var->type->is_integer()
- && !(var->type->is_sampler() && state->es_shader)
- && !(var->type->is_array()
- && (var->type->fields.array->is_float()
- || var->type->fields.array->is_integer()))) {
-
- _mesa_glsl_error(&loc, state,
- "precision qualifiers apply only to floating point"
- "%s types", state->es_shader ? ", integer, and sampler"
- : "and integer");
- }
-
- /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
- *
- * "[Sampler types] can only be declared as function
- * parameters or uniform variables (see Section 4.3.5
- * "Uniform")".
- */
- if (var_type->contains_sampler() &&
- !this->type->qualifier.flags.q.uniform) {
- _mesa_glsl_error(&loc, state, "samplers must be declared uniform");
- }
-
- /* Process the initializer and add its instructions to a temporary
- * list. This list will be added to the instruction stream (below) after
- * the declaration is added. This is done because in some cases (such as
- * redeclarations) the declaration may not actually be added to the
- * instruction stream.
- */
- exec_list initializer_instructions;
- ir_variable *earlier = get_variable_being_redeclared(var, decl, state);
-
- if (decl->initializer != NULL) {
- result = process_initializer((earlier == NULL) ? var : earlier,
- decl, this->type,
- &initializer_instructions, state);
- }
-
- /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
- *
- * "It is an error to write to a const variable outside of
- * its declaration, so they must be initialized when
- * declared."
- */
- if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) {
- _mesa_glsl_error(& loc, state,
- "const declaration of `%s' must be initialized",
- decl->identifier);
- }
-
- /* If the declaration is not a redeclaration, there are a few additional
- * semantic checks that must be applied. In addition, variable that was
- * created for the declaration should be added to the IR stream.
- */
- if (earlier == NULL) {
- /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
- *
- * "Identifiers starting with "gl_" are reserved for use by
- * OpenGL, and may not be declared in a shader as either a
- * variable or a function."
- */
- if (strncmp(decl->identifier, "gl_", 3) == 0)
- _mesa_glsl_error(& loc, state,
- "identifier `%s' uses reserved `gl_' prefix",
- decl->identifier);
-
- /* Add the variable to the symbol table. Note that the initializer's
- * IR was already processed earlier (though it hasn't been emitted
- * yet), without the variable in scope.
- *
- * This differs from most C-like languages, but it follows the GLSL
- * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
- * spec:
- *
- * "Within a declaration, the scope of a name starts immediately
- * after the initializer if present or immediately after the name
- * being declared if not."
- */
- if (!state->symbols->add_variable(var)) {
- YYLTYPE loc = this->get_location();
- _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
- "current scope", decl->identifier);
- continue;
- }
-
- /* Push the variable declaration to the top. It means that all the
- * variable declarations will appear in a funny last-to-first order,
- * but otherwise we run into trouble if a function is prototyped, a
- * global var is decled, then the function is defined with usage of
- * the global var. See glslparsertest's CorrectModule.frag.
- */
- instructions->push_head(var);
- }
-
- instructions->append_list(&initializer_instructions);
- }
-
-
- /* Generally, variable declarations do not have r-values. However,
- * one is used for the declaration in
- *
- * while (bool b = some_condition()) {
- * ...
- * }
- *
- * so we return the rvalue from the last seen declaration here.
- */
- return result;
-}
-
-
-ir_rvalue *
-ast_parameter_declarator::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- void *ctx = state;
- const struct glsl_type *type;
- const char *name = NULL;
- YYLTYPE loc = this->get_location();
-
- type = this->type->specifier->glsl_type(& name, state);
-
- if (type == NULL) {
- if (name != NULL) {
- _mesa_glsl_error(& loc, state,
- "invalid type `%s' in declaration of `%s'",
- name, this->identifier);
- } else {
- _mesa_glsl_error(& loc, state,
- "invalid type in declaration of `%s'",
- this->identifier);
- }
-
- type = glsl_type::error_type;
- }
-
- /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
- *
- * "Functions that accept no input arguments need not use void in the
- * argument list because prototypes (or definitions) are required and
- * therefore there is no ambiguity when an empty argument list "( )" is
- * declared. The idiom "(void)" as a parameter list is provided for
- * convenience."
- *
- * Placing this check here prevents a void parameter being set up
- * for a function, which avoids tripping up checks for main taking
- * parameters and lookups of an unnamed symbol.
- */
- if (type->is_void()) {
- if (this->identifier != NULL)
- _mesa_glsl_error(& loc, state,
- "named parameter cannot have type `void'");
-
- is_void = true;
- return NULL;
- }
-
- if (formal_parameter && (this->identifier == NULL)) {
- _mesa_glsl_error(& loc, state, "formal parameter lacks a name");
- return NULL;
- }
-
- /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
- * call already handled the "vec4[..] foo" case.
- */
- if (this->is_array) {
- type = process_array_type(&loc, type, this->array_size, state);
- }
-
- if (type->array_size() == 0) {
- _mesa_glsl_error(&loc, state, "arrays passed as parameters must have "
- "a declared size.");
- type = glsl_type::error_type;
- }
-
- is_void = false;
- ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in);
-
- /* Apply any specified qualifiers to the parameter declaration. Note that
- * for function parameters the default mode is 'in'.
- */
- apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc);
-
- /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
- *
- * "Samplers cannot be treated as l-values; hence cannot be used
- * as out or inout function parameters, nor can they be assigned
- * into."
- */
- if ((var->mode == ir_var_inout || var->mode == ir_var_out)
- && type->contains_sampler()) {
- _mesa_glsl_error(&loc, state, "out and inout parameters cannot contain samplers");
- type = glsl_type::error_type;
- }
-
- instructions->push_tail(var);
-
- /* Parameter declarations do not have r-values.
- */
- return NULL;
-}
-
-
-void
-ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters,
- bool formal,
- exec_list *ir_parameters,
- _mesa_glsl_parse_state *state)
-{
- ast_parameter_declarator *void_param = NULL;
- unsigned count = 0;
-
- foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) {
- param->formal_parameter = formal;
- param->hir(ir_parameters, state);
-
- if (param->is_void)
- void_param = param;
-
- count++;
- }
-
- if ((void_param != NULL) && (count > 1)) {
- YYLTYPE loc = void_param->get_location();
-
- _mesa_glsl_error(& loc, state,
- "`void' parameter must be only parameter");
- }
-}
-
-
-void
-emit_function(_mesa_glsl_parse_state *state, ir_function *f)
-{
- /* IR invariants disallow function declarations or definitions
- * nested within other function definitions. But there is no
- * requirement about the relative order of function declarations
- * and definitions with respect to one another. So simply insert
- * the new ir_function block at the end of the toplevel instruction
- * list.
- */
- state->toplevel_ir->push_tail(f);
-}
-
-
-ir_rvalue *
-ast_function::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- void *ctx = state;
- ir_function *f = NULL;
- ir_function_signature *sig = NULL;
- exec_list hir_parameters;
-
- const char *const name = identifier;
-
- /* New functions are always added to the top-level IR instruction stream,
- * so this instruction list pointer is ignored. See also emit_function
- * (called below).
- */
- (void) instructions;
-
- /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
- *
- * "Function declarations (prototypes) cannot occur inside of functions;
- * they must be at global scope, or for the built-in functions, outside
- * the global scope."
- *
- * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
- *
- * "User defined functions may only be defined within the global scope."
- *
- * Note that this language does not appear in GLSL 1.10.
- */
- if ((state->current_function != NULL) && (state->language_version != 110)) {
- YYLTYPE loc = this->get_location();
- _mesa_glsl_error(&loc, state,
- "declaration of function `%s' not allowed within "
- "function body", name);
- }
-
- /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
- *
- * "Identifiers starting with "gl_" are reserved for use by
- * OpenGL, and may not be declared in a shader as either a
- * variable or a function."
- */
- if (strncmp(name, "gl_", 3) == 0) {
- YYLTYPE loc = this->get_location();
- _mesa_glsl_error(&loc, state,
- "identifier `%s' uses reserved `gl_' prefix", name);
- }
-
- /* Convert the list of function parameters to HIR now so that they can be
- * used below to compare this function's signature with previously seen
- * signatures for functions with the same name.
- */
- ast_parameter_declarator::parameters_to_hir(& this->parameters,
- is_definition,
- & hir_parameters, state);
-
- const char *return_type_name;
- const glsl_type *return_type =
- this->return_type->specifier->glsl_type(& return_type_name, state);
-
- if (!return_type) {
- YYLTYPE loc = this->get_location();
- _mesa_glsl_error(&loc, state,
- "function `%s' has undeclared return type `%s'",
- name, return_type_name);
- return_type = glsl_type::error_type;
- }
-
- /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
- * "No qualifier is allowed on the return type of a function."
- */
- if (this->return_type->has_qualifiers()) {
- YYLTYPE loc = this->get_location();
- _mesa_glsl_error(& loc, state,
- "function `%s' return type has qualifiers", name);
- }
-
- /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
- *
- * "[Sampler types] can only be declared as function parameters
- * or uniform variables (see Section 4.3.5 "Uniform")".
- */
- if (return_type->contains_sampler()) {
- YYLTYPE loc = this->get_location();
- _mesa_glsl_error(&loc, state,
- "function `%s' return type can't contain a sampler",
- name);
- }
-
- /* Verify that this function's signature either doesn't match a previously
- * seen signature for a function with the same name, or, if a match is found,
- * that the previously seen signature does not have an associated definition.
- */
- f = state->symbols->get_function(name);
- if (f != NULL && (state->es_shader || f->has_user_signature())) {
- sig = f->exact_matching_signature(&hir_parameters);
- if (sig != NULL) {
- const char *badvar = sig->qualifiers_match(&hir_parameters);
- if (badvar != NULL) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' "
- "qualifiers don't match prototype", name, badvar);
- }
-
- if (sig->return_type != return_type) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(&loc, state, "function `%s' return type doesn't "
- "match prototype", name);
- }
-
- if (is_definition && sig->is_defined) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(& loc, state, "function `%s' redefined", name);
- }
- }
- } else {
- f = new(ctx) ir_function(name);
- if (!state->symbols->add_function(f)) {
- /* This function name shadows a non-function use of the same name. */
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(&loc, state, "function name `%s' conflicts with "
- "non-function", name);
- return NULL;
- }
-
- emit_function(state, f);
- }
-
- /* Verify the return type of main() */
- if (strcmp(name, "main") == 0) {
- if (! return_type->is_void()) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(& loc, state, "main() must return void");
- }
-
- if (!hir_parameters.is_empty()) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(& loc, state, "main() must not take any parameters");
- }
- }
-
- /* Finish storing the information about this new function in its signature.
- */
- if (sig == NULL) {
- sig = new(ctx) ir_function_signature(return_type);
- f->add_signature(sig);
- }
-
- sig->replace_parameters(&hir_parameters);
- signature = sig;
-
- /* Function declarations (prototypes) do not have r-values.
- */
- return NULL;
-}
-
-
-ir_rvalue *
-ast_function_definition::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- prototype->is_definition = true;
- prototype->hir(instructions, state);
-
- ir_function_signature *signature = prototype->signature;
- if (signature == NULL)
- return NULL;
-
- assert(state->current_function == NULL);
- state->current_function = signature;
- state->found_return = false;
-
- /* Duplicate parameters declared in the prototype as concrete variables.
- * Add these to the symbol table.
- */
- state->symbols->push_scope();
- foreach_iter(exec_list_iterator, iter, signature->parameters) {
- ir_variable *const var = ((ir_instruction *) iter.get())->as_variable();
-
- assert(var != NULL);
-
- /* The only way a parameter would "exist" is if two parameters have
- * the same name.
- */
- if (state->symbols->name_declared_this_scope(var->name)) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name);
- } else {
- state->symbols->add_variable(var);
- }
- }
-
- /* Convert the body of the function to HIR. */
- this->body->hir(&signature->body, state);
- signature->is_defined = true;
-
- state->symbols->pop_scope();
-
- assert(state->current_function == signature);
- state->current_function = NULL;
-
- if (!signature->return_type->is_void() && !state->found_return) {
- YYLTYPE loc = this->get_location();
- _mesa_glsl_error(& loc, state, "function `%s' has non-void return type "
- "%s, but no return statement",
- signature->function_name(),
- signature->return_type->name);
- }
-
- /* Function definitions do not have r-values.
- */
- return NULL;
-}
-
-
-ir_rvalue *
-ast_jump_statement::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- void *ctx = state;
-
- switch (mode) {
- case ast_return: {
- ir_return *inst;
- assert(state->current_function);
-
- if (opt_return_value) {
- ir_rvalue *const ret = opt_return_value->hir(instructions, state);
-
- /* The value of the return type can be NULL if the shader says
- * 'return foo();' and foo() is a function that returns void.
- *
- * NOTE: The GLSL spec doesn't say that this is an error. The type
- * of the return value is void. If the return type of the function is
- * also void, then this should compile without error. Seriously.
- */
- const glsl_type *const ret_type =
- (ret == NULL) ? glsl_type::void_type : ret->type;
-
- /* Implicit conversions are not allowed for return values. */
- if (state->current_function->return_type != ret_type) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(& loc, state,
- "`return' with wrong type %s, in function `%s' "
- "returning %s",
- ret_type->name,
- state->current_function->function_name(),
- state->current_function->return_type->name);
- }
-
- inst = new(ctx) ir_return(ret);
- } else {
- if (state->current_function->return_type->base_type !=
- GLSL_TYPE_VOID) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(& loc, state,
- "`return' with no value, in function %s returning "
- "non-void",
- state->current_function->function_name());
- }
- inst = new(ctx) ir_return;
- }
-
- state->found_return = true;
- instructions->push_tail(inst);
- break;
- }
-
- case ast_discard:
- if (state->target != fragment_shader) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(& loc, state,
- "`discard' may only appear in a fragment shader");
- }
- instructions->push_tail(new(ctx) ir_discard);
- break;
-
- case ast_break:
- case ast_continue:
- /* FINISHME: Handle switch-statements. They cannot contain 'continue',
- * FINISHME: and they use a different IR instruction for 'break'.
- */
- /* FINISHME: Correctly handle the nesting. If a switch-statement is
- * FINISHME: inside a loop, a 'continue' is valid and will bind to the
- * FINISHME: loop.
- */
- if (state->loop_or_switch_nesting == NULL) {
- YYLTYPE loc = this->get_location();
-
- _mesa_glsl_error(& loc, state,
- "`%s' may only appear in a loop",
- (mode == ast_break) ? "break" : "continue");
- } else {
- ir_loop *const loop = state->loop_or_switch_nesting->as_loop();
-
- /* Inline the for loop expression again, since we don't know
- * where near the end of the loop body the normal copy of it
- * is going to be placed.
- */
- if (mode == ast_continue &&
- state->loop_or_switch_nesting_ast->rest_expression) {
- state->loop_or_switch_nesting_ast->rest_expression->hir(instructions,
- state);
- }
-
- if (loop != NULL) {
- ir_loop_jump *const jump =
- new(ctx) ir_loop_jump((mode == ast_break)
- ? ir_loop_jump::jump_break
- : ir_loop_jump::jump_continue);
- instructions->push_tail(jump);
- }
- }
-
- break;
- }
-
- /* Jump instructions do not have r-values.
- */
- return NULL;
-}
-
-
-ir_rvalue *
-ast_selection_statement::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- void *ctx = state;
-
- ir_rvalue *const condition = this->condition->hir(instructions, state);
-
- /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
- *
- * "Any expression whose type evaluates to a Boolean can be used as the
- * conditional expression bool-expression. Vector types are not accepted
- * as the expression to if."
- *
- * The checks are separated so that higher quality diagnostics can be
- * generated for cases where both rules are violated.
- */
- if (!condition->type->is_boolean() || !condition->type->is_scalar()) {
- YYLTYPE loc = this->condition->get_location();
-
- _mesa_glsl_error(& loc, state, "if-statement condition must be scalar "
- "boolean");
- }
-
- ir_if *const stmt = new(ctx) ir_if(condition);
-
- if (then_statement != NULL) {
- state->symbols->push_scope();
- then_statement->hir(& stmt->then_instructions, state);
- state->symbols->pop_scope();
- }
-
- if (else_statement != NULL) {
- state->symbols->push_scope();
- else_statement->hir(& stmt->else_instructions, state);
- state->symbols->pop_scope();
- }
-
- instructions->push_tail(stmt);
-
- /* if-statements do not have r-values.
- */
- return NULL;
-}
-
-
-void
-ast_iteration_statement::condition_to_hir(ir_loop *stmt,
- struct _mesa_glsl_parse_state *state)
-{
- void *ctx = state;
-
- if (condition != NULL) {
- ir_rvalue *const cond =
- condition->hir(& stmt->body_instructions, state);
-
- if ((cond == NULL)
- || !cond->type->is_boolean() || !cond->type->is_scalar()) {
- YYLTYPE loc = condition->get_location();
-
- _mesa_glsl_error(& loc, state,
- "loop condition must be scalar boolean");
- } else {
- /* As the first code in the loop body, generate a block that looks
- * like 'if (!condition) break;' as the loop termination condition.
- */
- ir_rvalue *const not_cond =
- new(ctx) ir_expression(ir_unop_logic_not, glsl_type::bool_type, cond,
- NULL);
-
- ir_if *const if_stmt = new(ctx) ir_if(not_cond);
-
- ir_jump *const break_stmt =
- new(ctx) ir_loop_jump(ir_loop_jump::jump_break);
-
- if_stmt->then_instructions.push_tail(break_stmt);
- stmt->body_instructions.push_tail(if_stmt);
- }
- }
-}
-
-
-ir_rvalue *
-ast_iteration_statement::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- void *ctx = state;
-
- /* For-loops and while-loops start a new scope, but do-while loops do not.
- */
- if (mode != ast_do_while)
- state->symbols->push_scope();
-
- if (init_statement != NULL)
- init_statement->hir(instructions, state);
-
- ir_loop *const stmt = new(ctx) ir_loop();
- instructions->push_tail(stmt);
-
- /* Track the current loop and / or switch-statement nesting.
- */
- ir_instruction *const nesting = state->loop_or_switch_nesting;
- ast_iteration_statement *nesting_ast = state->loop_or_switch_nesting_ast;
-
- state->loop_or_switch_nesting = stmt;
- state->loop_or_switch_nesting_ast = this;
-
- if (mode != ast_do_while)
- condition_to_hir(stmt, state);
-
- if (body != NULL)
- body->hir(& stmt->body_instructions, state);
-
- if (rest_expression != NULL)
- rest_expression->hir(& stmt->body_instructions, state);
-
- if (mode == ast_do_while)
- condition_to_hir(stmt, state);
-
- if (mode != ast_do_while)
- state->symbols->pop_scope();
-
- /* Restore previous nesting before returning.
- */
- state->loop_or_switch_nesting = nesting;
- state->loop_or_switch_nesting_ast = nesting_ast;
-
- /* Loops do not have r-values.
- */
- return NULL;
-}
-
-
-ir_rvalue *
-ast_type_specifier::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- if (!this->is_precision_statement && this->structure == NULL)
- return NULL;
-
- YYLTYPE loc = this->get_location();
-
- if (this->precision != ast_precision_none
- && state->language_version != 100
- && state->language_version < 130) {
- _mesa_glsl_error(&loc, state,
- "precision qualifiers exist only in "
- "GLSL ES 1.00, and GLSL 1.30 and later");
- return NULL;
- }
- if (this->precision != ast_precision_none
- && this->structure != NULL) {
- _mesa_glsl_error(&loc, state,
- "precision qualifiers do not apply to structures");
- return NULL;
- }
-
- /* If this is a precision statement, check that the type to which it is
- * applied is either float or int.
- *
- * From section 4.5.3 of the GLSL 1.30 spec:
- * "The precision statement
- * precision precision-qualifier type;
- * can be used to establish a default precision qualifier. The type
- * field can be either int or float [...]. Any other types or
- * qualifiers will result in an error.
- */
- if (this->is_precision_statement) {
- assert(this->precision != ast_precision_none);
- assert(this->structure == NULL); /* The check for structures was
- * performed above. */
- if (this->is_array) {
- _mesa_glsl_error(&loc, state,
- "default precision statements do not apply to "
- "arrays");
- return NULL;
- }
- if (this->type_specifier != ast_float
- && this->type_specifier != ast_int) {
- _mesa_glsl_error(&loc, state,
- "default precision statements apply only to types "
- "float and int");
- return NULL;
- }
-
- /* FINISHME: Translate precision statements into IR. */
- return NULL;
- }
-
- if (this->structure != NULL)
- return this->structure->hir(instructions, state);
-
- return NULL;
-}
-
-
-ir_rvalue *
-ast_struct_specifier::hir(exec_list *instructions,
- struct _mesa_glsl_parse_state *state)
-{
- unsigned decl_count = 0;
-
- /* Make an initial pass over the list of structure fields to determine how
- * many there are. Each element in this list is an ast_declarator_list.
- * This means that we actually need to count the number of elements in the
- * 'declarations' list in each of the elements.
- */
- foreach_list_typed (ast_declarator_list, decl_list, link,
- &this->declarations) {
- foreach_list_const (decl_ptr, & decl_list->declarations) {
- decl_count++;
- }
- }
-
- /* Allocate storage for the structure fields and process the field
- * declarations. As the declarations are processed, try to also convert
- * the types to HIR. This ensures that structure definitions embedded in
- * other structure definitions are processed.
- */
- glsl_struct_field *const fields = ralloc_array(state, glsl_struct_field,
- decl_count);
-
- unsigned i = 0;
- foreach_list_typed (ast_declarator_list, decl_list, link,
- &this->declarations) {
- const char *type_name;
-
- decl_list->type->specifier->hir(instructions, state);
-
- /* Section 10.9 of the GLSL ES 1.00 specification states that
- * embedded structure definitions have been removed from the language.
- */
- if (state->es_shader && decl_list->type->specifier->structure != NULL) {
- YYLTYPE loc = this->get_location();
- _mesa_glsl_error(&loc, state, "Embedded structure definitions are "
- "not allowed in GLSL ES 1.00.");
- }
-
- const glsl_type *decl_type =
- decl_list->type->specifier->glsl_type(& type_name, state);
-
- foreach_list_typed (ast_declaration, decl, link,
- &decl_list->declarations) {
- const struct glsl_type *field_type = decl_type;
- if (decl->is_array) {
- YYLTYPE loc = decl->get_location();
- field_type = process_array_type(&loc, decl_type, decl->array_size,
- state);
- }
- fields[i].type = (field_type != NULL)
- ? field_type : glsl_type::error_type;
- fields[i].name = decl->identifier;
- i++;
- }
- }
-
- assert(i == decl_count);
-
- const glsl_type *t =
- glsl_type::get_record_instance(fields, decl_count, this->name);
-
- YYLTYPE loc = this->get_location();
- if (!state->symbols->add_type(name, t)) {
- _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name);
- } else {
- const glsl_type **s = reralloc(state, state->user_structures,
- const glsl_type *,
- state->num_user_structures + 1);
- if (s != NULL) {
- s[state->num_user_structures] = t;
- state->user_structures = s;
- state->num_user_structures++;
- }
- }
-
- /* Structure type definitions do not have r-values.
- */
- return NULL;
-}
+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file ast_to_hir.c
+ * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
+ *
+ * During the conversion to HIR, the majority of the symantic checking is
+ * preformed on the program. This includes:
+ *
+ * * Symbol table management
+ * * Type checking
+ * * Function binding
+ *
+ * The majority of this work could be done during parsing, and the parser could
+ * probably generate HIR directly. However, this results in frequent changes
+ * to the parser code. Since we do not assume that every system this complier
+ * is built on will have Flex and Bison installed, we have to store the code
+ * generated by these tools in our version control system. In other parts of
+ * the system we've seen problems where a parser was changed but the generated
+ * code was not committed, merge conflicts where created because two developers
+ * had slightly different versions of Bison installed, etc.
+ *
+ * I have also noticed that running Bison generated parsers in GDB is very
+ * irritating. When you get a segfault on '$$ = $1->foo', you can't very
+ * well 'print $1' in GDB.
+ *
+ * As a result, my preference is to put as little C code as possible in the
+ * parser (and lexer) sources.
+ */
+
+#include "main/core.h" /* for struct gl_extensions */
+#include "glsl_symbol_table.h"
+#include "glsl_parser_extras.h"
+#include "ast.h"
+#include "glsl_types.h"
+#include "ir.h"
+
+void
+_mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
+{
+ _mesa_glsl_initialize_variables(instructions, state);
+ _mesa_glsl_initialize_functions(state);
+
+ state->symbols->language_version = state->language_version;
+
+ state->current_function = NULL;
+
+ state->toplevel_ir = instructions;
+
+ /* Section 4.2 of the GLSL 1.20 specification states:
+ * "The built-in functions are scoped in a scope outside the global scope
+ * users declare global variables in. That is, a shader's global scope,
+ * available for user-defined functions and global variables, is nested
+ * inside the scope containing the built-in functions."
+ *
+ * Since built-in functions like ftransform() access built-in variables,
+ * it follows that those must be in the outer scope as well.
+ *
+ * We push scope here to create this nesting effect...but don't pop.
+ * This way, a shader's globals are still in the symbol table for use
+ * by the linker.
+ */
+ state->symbols->push_scope();
+
+ foreach_list_typed (ast_node, ast, link, & state->translation_unit)
+ ast->hir(instructions, state);
+
+ detect_recursion_unlinked(state, instructions);
+
+ state->toplevel_ir = NULL;
+}
+
+
+/**
+ * If a conversion is available, convert one operand to a different type
+ *
+ * The \c from \c ir_rvalue is converted "in place".
+ *
+ * \param to Type that the operand it to be converted to
+ * \param from Operand that is being converted
+ * \param state GLSL compiler state
+ *
+ * \return
+ * If a conversion is possible (or unnecessary), \c true is returned.
+ * Otherwise \c false is returned.
+ */
+bool
+apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
+ struct _mesa_glsl_parse_state *state)
+{
+ void *ctx = state;
+ if (to->base_type == from->type->base_type)
+ return true;
+
+ /* This conversion was added in GLSL 1.20. If the compilation mode is
+ * GLSL 1.10, the conversion is skipped.
+ */
+ if (state->language_version < 120)
+ return false;
+
+ /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "There are no implicit array or structure conversions. For
+ * example, an array of int cannot be implicitly converted to an
+ * array of float. There are no implicit conversions between
+ * signed and unsigned integers."
+ */
+ /* FINISHME: The above comment is partially a lie. There is int/uint
+ * FINISHME: conversion for immediate constants.
+ */
+ if (!to->is_float() || !from->type->is_numeric())
+ return false;
+
+ /* Convert to a floating point type with the same number of components
+ * as the original type - i.e. int to float, not int to vec4.
+ */
+ to = glsl_type::get_instance(GLSL_TYPE_FLOAT, from->type->vector_elements,
+ from->type->matrix_columns);
+
+ switch (from->type->base_type) {
+ case GLSL_TYPE_INT:
+ from = new(ctx) ir_expression(ir_unop_i2f, to, from, NULL);
+ break;
+ case GLSL_TYPE_UINT:
+ from = new(ctx) ir_expression(ir_unop_u2f, to, from, NULL);
+ break;
+ case GLSL_TYPE_BOOL:
+ from = new(ctx) ir_expression(ir_unop_b2f, to, from, NULL);
+ break;
+ default:
+ assert(0);
+ }
+
+ return true;
+}
+
+
+static const struct glsl_type *
+arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
+ bool multiply,
+ struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
+{
+ const glsl_type *type_a = value_a->type;
+ const glsl_type *type_b = value_b->type;
+
+ /* From GLSL 1.50 spec, page 56:
+ *
+ * "The arithmetic binary operators add (+), subtract (-),
+ * multiply (*), and divide (/) operate on integer and
+ * floating-point scalars, vectors, and matrices."
+ */
+ if (!type_a->is_numeric() || !type_b->is_numeric()) {
+ _mesa_glsl_error(loc, state,
+ "Operands to arithmetic operators must be numeric");
+ return glsl_type::error_type;
+ }
+
+
+ /* "If one operand is floating-point based and the other is
+ * not, then the conversions from Section 4.1.10 "Implicit
+ * Conversions" are applied to the non-floating-point-based operand."
+ */
+ if (!apply_implicit_conversion(type_a, value_b, state)
+ && !apply_implicit_conversion(type_b, value_a, state)) {
+ _mesa_glsl_error(loc, state,
+ "Could not implicitly convert operands to "
+ "arithmetic operator");
+ return glsl_type::error_type;
+ }
+ type_a = value_a->type;
+ type_b = value_b->type;
+
+ /* "If the operands are integer types, they must both be signed or
+ * both be unsigned."
+ *
+ * From this rule and the preceeding conversion it can be inferred that
+ * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
+ * The is_numeric check above already filtered out the case where either
+ * type is not one of these, so now the base types need only be tested for
+ * equality.
+ */
+ if (type_a->base_type != type_b->base_type) {
+ _mesa_glsl_error(loc, state,
+ "base type mismatch for arithmetic operator");
+ return glsl_type::error_type;
+ }
+
+ /* "All arithmetic binary operators result in the same fundamental type
+ * (signed integer, unsigned integer, or floating-point) as the
+ * operands they operate on, after operand type conversion. After
+ * conversion, the following cases are valid
+ *
+ * * The two operands are scalars. In this case the operation is
+ * applied, resulting in a scalar."
+ */
+ if (type_a->is_scalar() && type_b->is_scalar())
+ return type_a;
+
+ /* "* One operand is a scalar, and the other is a vector or matrix.
+ * In this case, the scalar operation is applied independently to each
+ * component of the vector or matrix, resulting in the same size
+ * vector or matrix."
+ */
+ if (type_a->is_scalar()) {
+ if (!type_b->is_scalar())
+ return type_b;
+ } else if (type_b->is_scalar()) {
+ return type_a;
+ }
+
+ /* All of the combinations of <scalar, scalar>, <vector, scalar>,
+ * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
+ * handled.
+ */
+ assert(!type_a->is_scalar());
+ assert(!type_b->is_scalar());
+
+ /* "* The two operands are vectors of the same size. In this case, the
+ * operation is done component-wise resulting in the same size
+ * vector."
+ */
+ if (type_a->is_vector() && type_b->is_vector()) {
+ if (type_a == type_b) {
+ return type_a;
+ } else {
+ _mesa_glsl_error(loc, state,
+ "vector size mismatch for arithmetic operator");
+ return glsl_type::error_type;
+ }
+ }
+
+ /* All of the combinations of <scalar, scalar>, <vector, scalar>,
+ * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
+ * <vector, vector> have been handled. At least one of the operands must
+ * be matrix. Further, since there are no integer matrix types, the base
+ * type of both operands must be float.
+ */
+ assert(type_a->is_matrix() || type_b->is_matrix());
+ assert(type_a->base_type == GLSL_TYPE_FLOAT);
+ assert(type_b->base_type == GLSL_TYPE_FLOAT);
+
+ /* "* The operator is add (+), subtract (-), or divide (/), and the
+ * operands are matrices with the same number of rows and the same
+ * number of columns. In this case, the operation is done component-
+ * wise resulting in the same size matrix."
+ * * The operator is multiply (*), where both operands are matrices or
+ * one operand is a vector and the other a matrix. A right vector
+ * operand is treated as a column vector and a left vector operand as a
+ * row vector. In all these cases, it is required that the number of
+ * columns of the left operand is equal to the number of rows of the
+ * right operand. Then, the multiply (*) operation does a linear
+ * algebraic multiply, yielding an object that has the same number of
+ * rows as the left operand and the same number of columns as the right
+ * operand. Section 5.10 "Vector and Matrix Operations" explains in
+ * more detail how vectors and matrices are operated on."
+ */
+ if (! multiply) {
+ if (type_a == type_b)
+ return type_a;
+ } else {
+ if (type_a->is_matrix() && type_b->is_matrix()) {
+ /* Matrix multiply. The columns of A must match the rows of B. Given
+ * the other previously tested constraints, this means the vector type
+ * of a row from A must be the same as the vector type of a column from
+ * B.
+ */
+ if (type_a->row_type() == type_b->column_type()) {
+ /* The resulting matrix has the number of columns of matrix B and
+ * the number of rows of matrix A. We get the row count of A by
+ * looking at the size of a vector that makes up a column. The
+ * transpose (size of a row) is done for B.
+ */
+ const glsl_type *const type =
+ glsl_type::get_instance(type_a->base_type,
+ type_a->column_type()->vector_elements,
+ type_b->row_type()->vector_elements);
+ assert(type != glsl_type::error_type);
+
+ return type;
+ }
+ } else if (type_a->is_matrix()) {
+ /* A is a matrix and B is a column vector. Columns of A must match
+ * rows of B. Given the other previously tested constraints, this
+ * means the vector type of a row from A must be the same as the
+ * vector the type of B.
+ */
+ if (type_a->row_type() == type_b) {
+ /* The resulting vector has a number of elements equal to
+ * the number of rows of matrix A. */
+ const glsl_type *const type =
+ glsl_type::get_instance(type_a->base_type,
+ type_a->column_type()->vector_elements,
+ 1);
+ assert(type != glsl_type::error_type);
+
+ return type;
+ }
+ } else {
+ assert(type_b->is_matrix());
+
+ /* A is a row vector and B is a matrix. Columns of A must match rows
+ * of B. Given the other previously tested constraints, this means
+ * the type of A must be the same as the vector type of a column from
+ * B.
+ */
+ if (type_a == type_b->column_type()) {
+ /* The resulting vector has a number of elements equal to
+ * the number of columns of matrix B. */
+ const glsl_type *const type =
+ glsl_type::get_instance(type_a->base_type,
+ type_b->row_type()->vector_elements,
+ 1);
+ assert(type != glsl_type::error_type);
+
+ return type;
+ }
+ }
+
+ _mesa_glsl_error(loc, state, "size mismatch for matrix multiplication");
+ return glsl_type::error_type;
+ }
+
+
+ /* "All other cases are illegal."
+ */
+ _mesa_glsl_error(loc, state, "type mismatch");
+ return glsl_type::error_type;
+}
+
+
+static const struct glsl_type *
+unary_arithmetic_result_type(const struct glsl_type *type,
+ struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
+{
+ /* From GLSL 1.50 spec, page 57:
+ *
+ * "The arithmetic unary operators negate (-), post- and pre-increment
+ * and decrement (-- and ++) operate on integer or floating-point
+ * values (including vectors and matrices). All unary operators work
+ * component-wise on their operands. These result with the same type
+ * they operated on."
+ */
+ if (!type->is_numeric()) {
+ _mesa_glsl_error(loc, state,
+ "Operands to arithmetic operators must be numeric");
+ return glsl_type::error_type;
+ }
+
+ return type;
+}
+
+/**
+ * \brief Return the result type of a bit-logic operation.
+ *
+ * If the given types to the bit-logic operator are invalid, return
+ * glsl_type::error_type.
+ *
+ * \param type_a Type of LHS of bit-logic op
+ * \param type_b Type of RHS of bit-logic op
+ */
+static const struct glsl_type *
+bit_logic_result_type(const struct glsl_type *type_a,
+ const struct glsl_type *type_b,
+ ast_operators op,
+ struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
+{
+ if (state->language_version < 130) {
+ _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
+ return glsl_type::error_type;
+ }
+
+ /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
+ *
+ * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
+ * (|). The operands must be of type signed or unsigned integers or
+ * integer vectors."
+ */
+ if (!type_a->is_integer()) {
+ _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer",
+ ast_expression::operator_string(op));
+ return glsl_type::error_type;
+ }
+ if (!type_b->is_integer()) {
+ _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer",
+ ast_expression::operator_string(op));
+ return glsl_type::error_type;
+ }
+
+ /* "The fundamental types of the operands (signed or unsigned) must
+ * match,"
+ */
+ if (type_a->base_type != type_b->base_type) {
+ _mesa_glsl_error(loc, state, "operands of `%s' must have the same "
+ "base type", ast_expression::operator_string(op));
+ return glsl_type::error_type;
+ }
+
+ /* "The operands cannot be vectors of differing size." */
+ if (type_a->is_vector() &&
+ type_b->is_vector() &&
+ type_a->vector_elements != type_b->vector_elements) {
+ _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of "
+ "different sizes", ast_expression::operator_string(op));
+ return glsl_type::error_type;
+ }
+
+ /* "If one operand is a scalar and the other a vector, the scalar is
+ * applied component-wise to the vector, resulting in the same type as
+ * the vector. The fundamental types of the operands [...] will be the
+ * resulting fundamental type."
+ */
+ if (type_a->is_scalar())
+ return type_b;
+ else
+ return type_a;
+}
+
+static const struct glsl_type *
+modulus_result_type(const struct glsl_type *type_a,
+ const struct glsl_type *type_b,
+ struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
+{
+ if (state->language_version < 130) {
+ _mesa_glsl_error(loc, state,
+ "operator '%%' is reserved in %s",
+ state->version_string);
+ return glsl_type::error_type;
+ }
+
+ /* From GLSL 1.50 spec, page 56:
+ * "The operator modulus (%) operates on signed or unsigned integers or
+ * integer vectors. The operand types must both be signed or both be
+ * unsigned."
+ */
+ if (!type_a->is_integer()) {
+ _mesa_glsl_error(loc, state, "LHS of operator %% must be an integer.");
+ return glsl_type::error_type;
+ }
+ if (!type_b->is_integer()) {
+ _mesa_glsl_error(loc, state, "RHS of operator %% must be an integer.");
+ return glsl_type::error_type;
+ }
+ if (type_a->base_type != type_b->base_type) {
+ _mesa_glsl_error(loc, state,
+ "operands of %% must have the same base type");
+ return glsl_type::error_type;
+ }
+
+ /* "The operands cannot be vectors of differing size. If one operand is
+ * a scalar and the other vector, then the scalar is applied component-
+ * wise to the vector, resulting in the same type as the vector. If both
+ * are vectors of the same size, the result is computed component-wise."
+ */
+ if (type_a->is_vector()) {
+ if (!type_b->is_vector()
+ || (type_a->vector_elements == type_b->vector_elements))
+ return type_a;
+ } else
+ return type_b;
+
+ /* "The operator modulus (%) is not defined for any other data types
+ * (non-integer types)."
+ */
+ _mesa_glsl_error(loc, state, "type mismatch");
+ return glsl_type::error_type;
+}
+
+
+static const struct glsl_type *
+relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
+ struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
+{
+ const glsl_type *type_a = value_a->type;
+ const glsl_type *type_b = value_b->type;
+
+ /* From GLSL 1.50 spec, page 56:
+ * "The relational operators greater than (>), less than (<), greater
+ * than or equal (>=), and less than or equal (<=) operate only on
+ * scalar integer and scalar floating-point expressions."
+ */
+ if (!type_a->is_numeric()
+ || !type_b->is_numeric()
+ || !type_a->is_scalar()
+ || !type_b->is_scalar()) {
+ _mesa_glsl_error(loc, state,
+ "Operands to relational operators must be scalar and "
+ "numeric");
+ return glsl_type::error_type;
+ }
+
+ /* "Either the operands' types must match, or the conversions from
+ * Section 4.1.10 "Implicit Conversions" will be applied to the integer
+ * operand, after which the types must match."
+ */
+ if (!apply_implicit_conversion(type_a, value_b, state)
+ && !apply_implicit_conversion(type_b, value_a, state)) {
+ _mesa_glsl_error(loc, state,
+ "Could not implicitly convert operands to "
+ "relational operator");
+ return glsl_type::error_type;
+ }
+ type_a = value_a->type;
+ type_b = value_b->type;
+
+ if (type_a->base_type != type_b->base_type) {
+ _mesa_glsl_error(loc, state, "base type mismatch");
+ return glsl_type::error_type;
+ }
+
+ /* "The result is scalar Boolean."
+ */
+ return glsl_type::bool_type;
+}
+
+/**
+ * \brief Return the result type of a bit-shift operation.
+ *
+ * If the given types to the bit-shift operator are invalid, return
+ * glsl_type::error_type.
+ *
+ * \param type_a Type of LHS of bit-shift op
+ * \param type_b Type of RHS of bit-shift op
+ */
+static const struct glsl_type *
+shift_result_type(const struct glsl_type *type_a,
+ const struct glsl_type *type_b,
+ ast_operators op,
+ struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
+{
+ if (state->language_version < 130) {
+ _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
+ return glsl_type::error_type;
+ }
+
+ /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
+ *
+ * "The shift operators (<<) and (>>). For both operators, the operands
+ * must be signed or unsigned integers or integer vectors. One operand
+ * can be signed while the other is unsigned."
+ */
+ if (!type_a->is_integer()) {
+ _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
+ "integer vector", ast_expression::operator_string(op));
+ return glsl_type::error_type;
+
+ }
+ if (!type_b->is_integer()) {
+ _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
+ "integer vector", ast_expression::operator_string(op));
+ return glsl_type::error_type;
+ }
+
+ /* "If the first operand is a scalar, the second operand has to be
+ * a scalar as well."
+ */
+ if (type_a->is_scalar() && !type_b->is_scalar()) {
+ _mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the "
+ "second must be scalar as well",
+ ast_expression::operator_string(op));
+ return glsl_type::error_type;
+ }
+
+ /* If both operands are vectors, check that they have same number of
+ * elements.
+ */
+ if (type_a->is_vector() &&
+ type_b->is_vector() &&
+ type_a->vector_elements != type_b->vector_elements) {
+ _mesa_glsl_error(loc, state, "Vector operands to operator %s must "
+ "have same number of elements",
+ ast_expression::operator_string(op));
+ return glsl_type::error_type;
+ }
+
+ /* "In all cases, the resulting type will be the same type as the left
+ * operand."
+ */
+ return type_a;
+}
+
+/**
+ * Validates that a value can be assigned to a location with a specified type
+ *
+ * Validates that \c rhs can be assigned to some location. If the types are
+ * not an exact match but an automatic conversion is possible, \c rhs will be
+ * converted.
+ *
+ * \return
+ * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
+ * Otherwise the actual RHS to be assigned will be returned. This may be
+ * \c rhs, or it may be \c rhs after some type conversion.
+ *
+ * \note
+ * In addition to being used for assignments, this function is used to
+ * type-check return values.
+ */
+ir_rvalue *
+validate_assignment(struct _mesa_glsl_parse_state *state,
+ const glsl_type *lhs_type, ir_rvalue *rhs,
+ bool is_initializer)
+{
+ /* If there is already some error in the RHS, just return it. Anything
+ * else will lead to an avalanche of error message back to the user.
+ */
+ if (rhs->type->is_error())
+ return rhs;
+
+ /* If the types are identical, the assignment can trivially proceed.
+ */
+ if (rhs->type == lhs_type)
+ return rhs;
+
+ /* If the array element types are the same and the size of the LHS is zero,
+ * the assignment is okay for initializers embedded in variable
+ * declarations.
+ *
+ * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
+ * is handled by ir_dereference::is_lvalue.
+ */
+ if (is_initializer && lhs_type->is_array() && rhs->type->is_array()
+ && (lhs_type->element_type() == rhs->type->element_type())
+ && (lhs_type->array_size() == 0)) {
+ return rhs;
+ }
+
+ /* Check for implicit conversion in GLSL 1.20 */
+ if (apply_implicit_conversion(lhs_type, rhs, state)) {
+ if (rhs->type == lhs_type)
+ return rhs;
+ }
+
+ return NULL;
+}
+
+static void
+mark_whole_array_access(ir_rvalue *access)
+{
+ ir_dereference_variable *deref = access->as_dereference_variable();
+
+ if (deref && deref->var) {
+ deref->var->max_array_access = deref->type->length - 1;
+ }
+}
+
+ir_rvalue *
+do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
+ ir_rvalue *lhs, ir_rvalue *rhs, bool is_initializer,
+ YYLTYPE lhs_loc)
+{
+ void *ctx = state;
+ bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
+
+ if (!error_emitted) {
+ if (lhs->variable_referenced() != NULL
+ && lhs->variable_referenced()->read_only) {
+ _mesa_glsl_error(&lhs_loc, state,
+ "assignment to read-only variable '%s'",
+ lhs->variable_referenced()->name);
+ error_emitted = true;
+
+ } else if (state->language_version <= 110 && lhs->type->is_array()) {
+ /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "Other binary or unary expressions, non-dereferenced
+ * arrays, function names, swizzles with repeated fields,
+ * and constants cannot be l-values."
+ */
+ _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
+ "allowed in GLSL 1.10 or GLSL ES 1.00.");
+ error_emitted = true;
+ } else if (!lhs->is_lvalue()) {
+ _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
+ error_emitted = true;
+ }
+ }
+
+ ir_rvalue *new_rhs =
+ validate_assignment(state, lhs->type, rhs, is_initializer);
+ if (new_rhs == NULL) {
+ _mesa_glsl_error(& lhs_loc, state, "type mismatch");
+ } else {
+ rhs = new_rhs;
+
+ /* If the LHS array was not declared with a size, it takes it size from
+ * the RHS. If the LHS is an l-value and a whole array, it must be a
+ * dereference of a variable. Any other case would require that the LHS
+ * is either not an l-value or not a whole array.
+ */
+ if (lhs->type->array_size() == 0) {
+ ir_dereference *const d = lhs->as_dereference();
+
+ assert(d != NULL);
+
+ ir_variable *const var = d->variable_referenced();
+
+ assert(var != NULL);
+
+ if (var->max_array_access >= unsigned(rhs->type->array_size())) {
+ /* FINISHME: This should actually log the location of the RHS. */
+ _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
+ "previous access",
+ var->max_array_access);
+ }
+
+ var->type = glsl_type::get_array_instance(lhs->type->element_type(),
+ rhs->type->array_size());
+ d->type = var->type;
+ }
+ mark_whole_array_access(rhs);
+ mark_whole_array_access(lhs);
+ }
+
+ /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
+ * but not post_inc) need the converted assigned value as an rvalue
+ * to handle things like:
+ *
+ * i = j += 1;
+ *
+ * So we always just store the computed value being assigned to a
+ * temporary and return a deref of that temporary. If the rvalue
+ * ends up not being used, the temp will get copy-propagated out.
+ */
+ ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
+ ir_var_temporary);
+ ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var);
+ instructions->push_tail(var);
+ instructions->push_tail(new(ctx) ir_assignment(deref_var,
+ rhs,
+ NULL));
+ deref_var = new(ctx) ir_dereference_variable(var);
+
+ if (!error_emitted)
+ instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var, NULL));
+
+ return new(ctx) ir_dereference_variable(var);
+}
+
+static ir_rvalue *
+get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
+{
+ void *ctx = ralloc_parent(lvalue);
+ ir_variable *var;
+
+ var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
+ ir_var_temporary);
+ instructions->push_tail(var);
+ var->mode = ir_var_auto;
+
+ instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
+ lvalue, NULL));
+
+ /* Once we've created this temporary, mark it read only so it's no
+ * longer considered an lvalue.
+ */
+ var->read_only = true;
+
+ return new(ctx) ir_dereference_variable(var);
+}
+
+
+ir_rvalue *
+ast_node::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ (void) instructions;
+ (void) state;
+
+ return NULL;
+}
+
+static ir_rvalue *
+do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
+{
+ int join_op;
+ ir_rvalue *cmp = NULL;
+
+ if (operation == ir_binop_all_equal)
+ join_op = ir_binop_logic_and;
+ else
+ join_op = ir_binop_logic_or;
+
+ switch (op0->type->base_type) {
+ case GLSL_TYPE_FLOAT:
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT:
+ case GLSL_TYPE_BOOL:
+ return new(mem_ctx) ir_expression(operation, op0, op1);
+
+ case GLSL_TYPE_ARRAY: {
+ for (unsigned int i = 0; i < op0->type->length; i++) {
+ ir_rvalue *e0, *e1, *result;
+
+ e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL),
+ new(mem_ctx) ir_constant(i));
+ e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL),
+ new(mem_ctx) ir_constant(i));
+ result = do_comparison(mem_ctx, operation, e0, e1);
+
+ if (cmp) {
+ cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
+ } else {
+ cmp = result;
+ }
+ }
+
+ mark_whole_array_access(op0);
+ mark_whole_array_access(op1);
+ break;
+ }
+
+ case GLSL_TYPE_STRUCT: {
+ for (unsigned int i = 0; i < op0->type->length; i++) {
+ ir_rvalue *e0, *e1, *result;
+ const char *field_name = op0->type->fields.structure[i].name;
+
+ e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL),
+ field_name);
+ e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL),
+ field_name);
+ result = do_comparison(mem_ctx, operation, e0, e1);
+
+ if (cmp) {
+ cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
+ } else {
+ cmp = result;
+ }
+ }
+ break;
+ }
+
+ case GLSL_TYPE_ERROR:
+ case GLSL_TYPE_VOID:
+ case GLSL_TYPE_SAMPLER:
+ /* I assume a comparison of a struct containing a sampler just
+ * ignores the sampler present in the type.
+ */
+ break;
+
+ default:
+ assert(!"Should not get here.");
+ break;
+ }
+
+ if (cmp == NULL)
+ cmp = new(mem_ctx) ir_constant(true);
+
+ return cmp;
+}
+
+/* For logical operations, we want to ensure that the operands are
+ * scalar booleans. If it isn't, emit an error and return a constant
+ * boolean to avoid triggering cascading error messages.
+ */
+ir_rvalue *
+get_scalar_boolean_operand(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state,
+ ast_expression *parent_expr,
+ int operand,
+ const char *operand_name,
+ bool *error_emitted)
+{
+ ast_expression *expr = parent_expr->subexpressions[operand];
+ void *ctx = state;
+ ir_rvalue *val = expr->hir(instructions, state);
+
+ if (val->type->is_boolean() && val->type->is_scalar())
+ return val;
+
+ if (!*error_emitted) {
+ YYLTYPE loc = expr->get_location();
+ _mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean",
+ operand_name,
+ parent_expr->operator_string(parent_expr->oper));
+ *error_emitted = true;
+ }
+
+ return new(ctx) ir_constant(true);
+}
+
+/**
+ * If name refers to a builtin array whose maximum allowed size is less than
+ * size, report an error and return true. Otherwise return false.
+ */
+static bool
+check_builtin_array_max_size(const char *name, unsigned size,
+ YYLTYPE loc, struct _mesa_glsl_parse_state *state)
+{
+ if ((strcmp("gl_TexCoord", name) == 0)
+ && (size > state->Const.MaxTextureCoords)) {
+ /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
+ *
+ * "The size [of gl_TexCoord] can be at most
+ * gl_MaxTextureCoords."
+ */
+ _mesa_glsl_error(&loc, state, "`gl_TexCoord' array size cannot "
+ "be larger than gl_MaxTextureCoords (%u)\n",
+ state->Const.MaxTextureCoords);
+ return true;
+ } else if (strcmp("gl_ClipDistance", name) == 0
+ && size > state->Const.MaxClipPlanes) {
+ /* From section 7.1 (Vertex Shader Special Variables) of the
+ * GLSL 1.30 spec:
+ *
+ * "The gl_ClipDistance array is predeclared as unsized and
+ * must be sized by the shader either redeclaring it with a
+ * size or indexing it only with integral constant
+ * expressions. ... The size can be at most
+ * gl_MaxClipDistances."
+ */
+ _mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
+ "be larger than gl_MaxClipDistances (%u)\n",
+ state->Const.MaxClipPlanes);
+ return true;
+ }
+ return false;
+}
+
+ir_rvalue *
+ast_expression::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ void *ctx = state;
+ static const int operations[AST_NUM_OPERATORS] = {
+ -1, /* ast_assign doesn't convert to ir_expression. */
+ -1, /* ast_plus doesn't convert to ir_expression. */
+ ir_unop_neg,
+ ir_binop_add,
+ ir_binop_sub,
+ ir_binop_mul,
+ ir_binop_div,
+ ir_binop_mod,
+ ir_binop_lshift,
+ ir_binop_rshift,
+ ir_binop_less,
+ ir_binop_greater,
+ ir_binop_lequal,
+ ir_binop_gequal,
+ ir_binop_all_equal,
+ ir_binop_any_nequal,
+ ir_binop_bit_and,
+ ir_binop_bit_xor,
+ ir_binop_bit_or,
+ ir_unop_bit_not,
+ ir_binop_logic_and,
+ ir_binop_logic_xor,
+ ir_binop_logic_or,
+ ir_unop_logic_not,
+
+ /* Note: The following block of expression types actually convert
+ * to multiple IR instructions.
+ */
+ ir_binop_mul, /* ast_mul_assign */
+ ir_binop_div, /* ast_div_assign */
+ ir_binop_mod, /* ast_mod_assign */
+ ir_binop_add, /* ast_add_assign */
+ ir_binop_sub, /* ast_sub_assign */
+ ir_binop_lshift, /* ast_ls_assign */
+ ir_binop_rshift, /* ast_rs_assign */
+ ir_binop_bit_and, /* ast_and_assign */
+ ir_binop_bit_xor, /* ast_xor_assign */
+ ir_binop_bit_or, /* ast_or_assign */
+
+ -1, /* ast_conditional doesn't convert to ir_expression. */
+ ir_binop_add, /* ast_pre_inc. */
+ ir_binop_sub, /* ast_pre_dec. */
+ ir_binop_add, /* ast_post_inc. */
+ ir_binop_sub, /* ast_post_dec. */
+ -1, /* ast_field_selection doesn't conv to ir_expression. */
+ -1, /* ast_array_index doesn't convert to ir_expression. */
+ -1, /* ast_function_call doesn't conv to ir_expression. */
+ -1, /* ast_identifier doesn't convert to ir_expression. */
+ -1, /* ast_int_constant doesn't convert to ir_expression. */
+ -1, /* ast_uint_constant doesn't conv to ir_expression. */
+ -1, /* ast_float_constant doesn't conv to ir_expression. */
+ -1, /* ast_bool_constant doesn't conv to ir_expression. */
+ -1, /* ast_sequence doesn't convert to ir_expression. */
+ };
+ ir_rvalue *result = NULL;
+ ir_rvalue *op[3];
+ const struct glsl_type *type; /* a temporary variable for switch cases */
+ bool error_emitted = false;
+ YYLTYPE loc;
+
+ loc = this->get_location();
+
+ switch (this->oper) {
+ case ast_assign: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+ result = do_assignment(instructions, state, op[0], op[1], false,
+ this->subexpressions[0]->get_location());
+ error_emitted = result->type->is_error();
+ break;
+ }
+
+ case ast_plus:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+
+ type = unary_arithmetic_result_type(op[0]->type, state, & loc);
+
+ error_emitted = type->is_error();
+
+ result = op[0];
+ break;
+
+ case ast_neg:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+
+ type = unary_arithmetic_result_type(op[0]->type, state, & loc);
+
+ error_emitted = type->is_error();
+
+ result = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], NULL);
+ break;
+
+ case ast_add:
+ case ast_sub:
+ case ast_mul:
+ case ast_div:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+ type = arithmetic_result_type(op[0], op[1],
+ (this->oper == ast_mul),
+ state, & loc);
+ error_emitted = type->is_error();
+
+ result = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], op[1]);
+ break;
+
+ case ast_mod:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+ type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
+
+ assert(operations[this->oper] == ir_binop_mod);
+
+ result = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], op[1]);
+ error_emitted = type->is_error();
+ break;
+
+ case ast_lshift:
+ case ast_rshift:
+ if (state->language_version < 130) {
+ _mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30",
+ operator_string(this->oper));
+ error_emitted = true;
+ }
+
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+ type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
+ &loc);
+ result = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], op[1]);
+ error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
+ break;
+
+ case ast_less:
+ case ast_greater:
+ case ast_lequal:
+ case ast_gequal:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+ type = relational_result_type(op[0], op[1], state, & loc);
+
+ /* The relational operators must either generate an error or result
+ * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
+ */
+ assert(type->is_error()
+ || ((type->base_type == GLSL_TYPE_BOOL)
+ && type->is_scalar()));
+
+ result = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], op[1]);
+ error_emitted = type->is_error();
+ break;
+
+ case ast_nequal:
+ case ast_equal:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+ /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "The equality operators equal (==), and not equal (!=)
+ * operate on all types. They result in a scalar Boolean. If
+ * the operand types do not match, then there must be a
+ * conversion from Section 4.1.10 "Implicit Conversions"
+ * applied to one operand that can make them match, in which
+ * case this conversion is done."
+ */
+ if ((!apply_implicit_conversion(op[0]->type, op[1], state)
+ && !apply_implicit_conversion(op[1]->type, op[0], state))
+ || (op[0]->type != op[1]->type)) {
+ _mesa_glsl_error(& loc, state, "operands of `%s' must have the same "
+ "type", (this->oper == ast_equal) ? "==" : "!=");
+ error_emitted = true;
+ } else if ((state->language_version <= 110)
+ && (op[0]->type->is_array() || op[1]->type->is_array())) {
+ _mesa_glsl_error(& loc, state, "array comparisons forbidden in "
+ "GLSL 1.10");
+ error_emitted = true;
+ }
+
+ if (error_emitted) {
+ result = new(ctx) ir_constant(false);
+ } else {
+ result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
+ assert(result->type == glsl_type::bool_type);
+ }
+ break;
+
+ case ast_bit_and:
+ case ast_bit_xor:
+ case ast_bit_or:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+ type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
+ state, &loc);
+ result = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], op[1]);
+ error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
+ break;
+
+ case ast_bit_not:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+
+ if (state->language_version < 130) {
+ _mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30");
+ error_emitted = true;
+ }
+
+ if (!op[0]->type->is_integer()) {
+ _mesa_glsl_error(&loc, state, "operand of `~' must be an integer");
+ error_emitted = true;
+ }
+
+ type = op[0]->type;
+ result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL);
+ break;
+
+ case ast_logic_and: {
+ exec_list rhs_instructions;
+ op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
+ "LHS", &error_emitted);
+ op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
+ "RHS", &error_emitted);
+
+ ir_constant *op0_const = op[0]->constant_expression_value();
+ if (op0_const) {
+ if (op0_const->value.b[0]) {
+ instructions->append_list(&rhs_instructions);
+ result = op[1];
+ } else {
+ result = op0_const;
+ }
+ type = glsl_type::bool_type;
+ } else {
+ ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
+ "and_tmp",
+ ir_var_temporary);
+ instructions->push_tail(tmp);
+
+ ir_if *const stmt = new(ctx) ir_if(op[0]);
+ instructions->push_tail(stmt);
+
+ stmt->then_instructions.append_list(&rhs_instructions);
+ ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
+ ir_assignment *const then_assign =
+ new(ctx) ir_assignment(then_deref, op[1], NULL);
+ stmt->then_instructions.push_tail(then_assign);
+
+ ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
+ ir_assignment *const else_assign =
+ new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false), NULL);
+ stmt->else_instructions.push_tail(else_assign);
+
+ result = new(ctx) ir_dereference_variable(tmp);
+ type = tmp->type;
+ }
+ break;
+ }
+
+ case ast_logic_or: {
+ exec_list rhs_instructions;
+ op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
+ "LHS", &error_emitted);
+ op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
+ "RHS", &error_emitted);
+
+ ir_constant *op0_const = op[0]->constant_expression_value();
+ if (op0_const) {
+ if (op0_const->value.b[0]) {
+ result = op0_const;
+ } else {
+ result = op[1];
+ }
+ type = glsl_type::bool_type;
+ } else {
+ ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
+ "or_tmp",
+ ir_var_temporary);
+ instructions->push_tail(tmp);
+
+ ir_if *const stmt = new(ctx) ir_if(op[0]);
+ instructions->push_tail(stmt);
+
+ ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
+ ir_assignment *const then_assign =
+ new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true), NULL);
+ stmt->then_instructions.push_tail(then_assign);
+
+ stmt->else_instructions.append_list(&rhs_instructions);
+ ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
+ ir_assignment *const else_assign =
+ new(ctx) ir_assignment(else_deref, op[1], NULL);
+ stmt->else_instructions.push_tail(else_assign);
+
+ result = new(ctx) ir_dereference_variable(tmp);
+ type = tmp->type;
+ }
+ break;
+ }
+
+ case ast_logic_xor:
+ /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "The logical binary operators and (&&), or ( | | ), and
+ * exclusive or (^^). They operate only on two Boolean
+ * expressions and result in a Boolean expression."
+ */
+ op[0] = get_scalar_boolean_operand(instructions, state, this, 0, "LHS",
+ &error_emitted);
+ op[1] = get_scalar_boolean_operand(instructions, state, this, 1, "RHS",
+ &error_emitted);
+
+ result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
+ op[0], op[1]);
+ break;
+
+ case ast_logic_not:
+ op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
+ "operand", &error_emitted);
+
+ result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
+ op[0], NULL);
+ break;
+
+ case ast_mul_assign:
+ case ast_div_assign:
+ case ast_add_assign:
+ case ast_sub_assign: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+ type = arithmetic_result_type(op[0], op[1],
+ (this->oper == ast_mul_assign),
+ state, & loc);
+
+ ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], op[1]);
+
+ result = do_assignment(instructions, state,
+ op[0]->clone(ctx, NULL), temp_rhs, false,
+ this->subexpressions[0]->get_location());
+ error_emitted = (op[0]->type->is_error());
+
+ /* GLSL 1.10 does not allow array assignment. However, we don't have to
+ * explicitly test for this because none of the binary expression
+ * operators allow array operands either.
+ */
+
+ break;
+ }
+
+ case ast_mod_assign: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+ type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
+
+ assert(operations[this->oper] == ir_binop_mod);
+
+ ir_rvalue *temp_rhs;
+ temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], op[1]);
+
+ result = do_assignment(instructions, state,
+ op[0]->clone(ctx, NULL), temp_rhs, false,
+ this->subexpressions[0]->get_location());
+ error_emitted = type->is_error();
+ break;
+ }
+
+ case ast_ls_assign:
+ case ast_rs_assign: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+ type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
+ &loc);
+ ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
+ type, op[0], op[1]);
+ result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
+ temp_rhs, false,
+ this->subexpressions[0]->get_location());
+ error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
+ break;
+ }
+
+ case ast_and_assign:
+ case ast_xor_assign:
+ case ast_or_assign: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+ type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
+ state, &loc);
+ ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
+ type, op[0], op[1]);
+ result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
+ temp_rhs, false,
+ this->subexpressions[0]->get_location());
+ error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
+ break;
+ }
+
+ case ast_conditional: {
+ /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "The ternary selection operator (?:). It operates on three
+ * expressions (exp1 ? exp2 : exp3). This operator evaluates the
+ * first expression, which must result in a scalar Boolean."
+ */
+ op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
+ "condition", &error_emitted);
+
+ /* The :? operator is implemented by generating an anonymous temporary
+ * followed by an if-statement. The last instruction in each branch of
+ * the if-statement assigns a value to the anonymous temporary. This
+ * temporary is the r-value of the expression.
+ */
+ exec_list then_instructions;
+ exec_list else_instructions;
+
+ op[1] = this->subexpressions[1]->hir(&then_instructions, state);
+ op[2] = this->subexpressions[2]->hir(&else_instructions, state);
+
+ /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "The second and third expressions can be any type, as
+ * long their types match, or there is a conversion in
+ * Section 4.1.10 "Implicit Conversions" that can be applied
+ * to one of the expressions to make their types match. This
+ * resulting matching type is the type of the entire
+ * expression."
+ */
+ if ((!apply_implicit_conversion(op[1]->type, op[2], state)
+ && !apply_implicit_conversion(op[2]->type, op[1], state))
+ || (op[1]->type != op[2]->type)) {
+ YYLTYPE loc = this->subexpressions[1]->get_location();
+
+ _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
+ "operator must have matching types.");
+ error_emitted = true;
+ type = glsl_type::error_type;
+ } else {
+ type = op[1]->type;
+ }
+
+ /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "The second and third expressions must be the same type, but can
+ * be of any type other than an array."
+ */
+ if ((state->language_version <= 110) && type->is_array()) {
+ _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
+ "operator must not be arrays.");
+ error_emitted = true;
+ }
+
+ ir_constant *cond_val = op[0]->constant_expression_value();
+ ir_constant *then_val = op[1]->constant_expression_value();
+ ir_constant *else_val = op[2]->constant_expression_value();
+
+ if (then_instructions.is_empty()
+ && else_instructions.is_empty()
+ && (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) {
+ result = (cond_val->value.b[0]) ? then_val : else_val;
+ } else {
+ ir_variable *const tmp =
+ new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary);
+ instructions->push_tail(tmp);
+
+ ir_if *const stmt = new(ctx) ir_if(op[0]);
+ instructions->push_tail(stmt);
+
+ then_instructions.move_nodes_to(& stmt->then_instructions);
+ ir_dereference *const then_deref =
+ new(ctx) ir_dereference_variable(tmp);
+ ir_assignment *const then_assign =
+ new(ctx) ir_assignment(then_deref, op[1], NULL);
+ stmt->then_instructions.push_tail(then_assign);
+
+ else_instructions.move_nodes_to(& stmt->else_instructions);
+ ir_dereference *const else_deref =
+ new(ctx) ir_dereference_variable(tmp);
+ ir_assignment *const else_assign =
+ new(ctx) ir_assignment(else_deref, op[2], NULL);
+ stmt->else_instructions.push_tail(else_assign);
+
+ result = new(ctx) ir_dereference_variable(tmp);
+ }
+ break;
+ }
+
+ case ast_pre_inc:
+ case ast_pre_dec: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
+ op[1] = new(ctx) ir_constant(1.0f);
+ else
+ op[1] = new(ctx) ir_constant(1);
+
+ type = arithmetic_result_type(op[0], op[1], false, state, & loc);
+
+ ir_rvalue *temp_rhs;
+ temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], op[1]);
+
+ result = do_assignment(instructions, state,
+ op[0]->clone(ctx, NULL), temp_rhs, false,
+ this->subexpressions[0]->get_location());
+ error_emitted = op[0]->type->is_error();
+ break;
+ }
+
+ case ast_post_inc:
+ case ast_post_dec: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
+ op[1] = new(ctx) ir_constant(1.0f);
+ else
+ op[1] = new(ctx) ir_constant(1);
+
+ error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
+
+ type = arithmetic_result_type(op[0], op[1], false, state, & loc);
+
+ ir_rvalue *temp_rhs;
+ temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
+ op[0], op[1]);
+
+ /* Get a temporary of a copy of the lvalue before it's modified.
+ * This may get thrown away later.
+ */
+ result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL));
+
+ (void)do_assignment(instructions, state,
+ op[0]->clone(ctx, NULL), temp_rhs, false,
+ this->subexpressions[0]->get_location());
+
+ error_emitted = op[0]->type->is_error();
+ break;
+ }
+
+ case ast_field_selection:
+ result = _mesa_ast_field_selection_to_hir(this, instructions, state);
+ break;
+
+ case ast_array_index: {
+ YYLTYPE index_loc = subexpressions[1]->get_location();
+
+ op[0] = subexpressions[0]->hir(instructions, state);
+ op[1] = subexpressions[1]->hir(instructions, state);
+
+ error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
+
+ ir_rvalue *const array = op[0];
+
+ result = new(ctx) ir_dereference_array(op[0], op[1]);
+
+ /* Do not use op[0] after this point. Use array.
+ */
+ op[0] = NULL;
+
+
+ if (error_emitted)
+ break;
+
+ if (!array->type->is_array()
+ && !array->type->is_matrix()
+ && !array->type->is_vector()) {
+ _mesa_glsl_error(& index_loc, state,
+ "cannot dereference non-array / non-matrix / "
+ "non-vector");
+ error_emitted = true;
+ }
+
+ if (!op[1]->type->is_integer()) {
+ _mesa_glsl_error(& index_loc, state,
+ "array index must be integer type");
+ error_emitted = true;
+ } else if (!op[1]->type->is_scalar()) {
+ _mesa_glsl_error(& index_loc, state,
+ "array index must be scalar");
+ error_emitted = true;
+ }
+
+ /* If the array index is a constant expression and the array has a
+ * declared size, ensure that the access is in-bounds. If the array
+ * index is not a constant expression, ensure that the array has a
+ * declared size.
+ */
+ ir_constant *const const_index = op[1]->constant_expression_value();
+ if (const_index != NULL) {
+ const int idx = const_index->value.i[0];
+ const char *type_name;
+ unsigned bound = 0;
+
+ if (array->type->is_matrix()) {
+ type_name = "matrix";
+ } else if (array->type->is_vector()) {
+ type_name = "vector";
+ } else {
+ type_name = "array";
+ }
+
+ /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "It is illegal to declare an array with a size, and then
+ * later (in the same shader) index the same array with an
+ * integral constant expression greater than or equal to the
+ * declared size. It is also illegal to index an array with a
+ * negative constant expression."
+ */
+ if (array->type->is_matrix()) {
+ if (array->type->row_type()->vector_elements <= idx) {
+ bound = array->type->row_type()->vector_elements;
+ }
+ } else if (array->type->is_vector()) {
+ if (array->type->vector_elements <= idx) {
+ bound = array->type->vector_elements;
+ }
+ } else {
+ if ((array->type->array_size() > 0)
+ && (array->type->array_size() <= idx)) {
+ bound = array->type->array_size();
+ }
+ }
+
+ if (bound > 0) {
+ _mesa_glsl_error(& loc, state, "%s index must be < %u",
+ type_name, bound);
+ error_emitted = true;
+ } else if (idx < 0) {
+ _mesa_glsl_error(& loc, state, "%s index must be >= 0",
+ type_name);
+ error_emitted = true;
+ }
+
+ if (array->type->is_array()) {
+ /* If the array is a variable dereference, it dereferences the
+ * whole array, by definition. Use this to get the variable.
+ *
+ * FINISHME: Should some methods for getting / setting / testing
+ * FINISHME: array access limits be added to ir_dereference?
+ */
+ ir_variable *const v = array->whole_variable_referenced();
+ if ((v != NULL) && (unsigned(idx) > v->max_array_access)) {
+ v->max_array_access = idx;
+
+ /* Check whether this access will, as a side effect, implicitly
+ * cause the size of a built-in array to be too large.
+ */
+ if (check_builtin_array_max_size(v->name, idx+1, loc, state))
+ error_emitted = true;
+ }
+ }
+ } else if (array->type->array_size() == 0) {
+ _mesa_glsl_error(&loc, state, "unsized array index must be constant");
+ } else {
+ if (array->type->is_array()) {
+ /* whole_variable_referenced can return NULL if the array is a
+ * member of a structure. In this case it is safe to not update
+ * the max_array_access field because it is never used for fields
+ * of structures.
+ */
+ ir_variable *v = array->whole_variable_referenced();
+ if (v != NULL)
+ v->max_array_access = array->type->array_size() - 1;
+ }
+ }
+
+ /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
+ *
+ * "Samplers aggregated into arrays within a shader (using square
+ * brackets [ ]) can only be indexed with integral constant
+ * expressions [...]."
+ *
+ * This restriction was added in GLSL 1.30. Shaders using earlier version
+ * of the language should not be rejected by the compiler front-end for
+ * using this construct. This allows useful things such as using a loop
+ * counter as the index to an array of samplers. If the loop in unrolled,
+ * the code should compile correctly. Instead, emit a warning.
+ */
+ if (array->type->is_array() &&
+ array->type->element_type()->is_sampler() &&
+ const_index == NULL) {
+
+ if (state->language_version == 100) {
+ _mesa_glsl_warning(&loc, state,
+ "sampler arrays indexed with non-constant "
+ "expressions is optional in GLSL ES 1.00");
+ } else if (state->language_version < 130) {
+ _mesa_glsl_warning(&loc, state,
+ "sampler arrays indexed with non-constant "
+ "expressions is forbidden in GLSL 1.30 and "
+ "later");
+ } else {
+ _mesa_glsl_error(&loc, state,
+ "sampler arrays indexed with non-constant "
+ "expressions is forbidden in GLSL 1.30 and "
+ "later");
+ error_emitted = true;
+ }
+ }
+
+ if (error_emitted)
+ result->type = glsl_type::error_type;
+
+ break;
+ }
+
+ case ast_function_call:
+ /* Should *NEVER* get here. ast_function_call should always be handled
+ * by ast_function_expression::hir.
+ */
+ assert(0);
+ break;
+
+ case ast_identifier: {
+ /* ast_identifier can appear several places in a full abstract syntax
+ * tree. This particular use must be at location specified in the grammar
+ * as 'variable_identifier'.
+ */
+ ir_variable *var =
+ state->symbols->get_variable(this->primary_expression.identifier);
+
+ result = new(ctx) ir_dereference_variable(var);
+
+ if (var != NULL) {
+ var->used = true;
+ } else {
+ _mesa_glsl_error(& loc, state, "`%s' undeclared",
+ this->primary_expression.identifier);
+
+ error_emitted = true;
+ }
+ break;
+ }
+
+ case ast_int_constant:
+ result = new(ctx) ir_constant(this->primary_expression.int_constant);
+ break;
+
+ case ast_uint_constant:
+ result = new(ctx) ir_constant(this->primary_expression.uint_constant);
+ break;
+
+ case ast_float_constant:
+ result = new(ctx) ir_constant(this->primary_expression.float_constant);
+ break;
+
+ case ast_bool_constant:
+ result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant));
+ break;
+
+ case ast_sequence: {
+ /* It should not be possible to generate a sequence in the AST without
+ * any expressions in it.
+ */
+ assert(!this->expressions.is_empty());
+
+ /* The r-value of a sequence is the last expression in the sequence. If
+ * the other expressions in the sequence do not have side-effects (and
+ * therefore add instructions to the instruction list), they get dropped
+ * on the floor.
+ */
+ exec_node *previous_tail_pred = NULL;
+ YYLTYPE previous_operand_loc = loc;
+
+ foreach_list_typed (ast_node, ast, link, &this->expressions) {
+ /* If one of the operands of comma operator does not generate any
+ * code, we want to emit a warning. At each pass through the loop
+ * previous_tail_pred will point to the last instruction in the
+ * stream *before* processing the previous operand. Naturally,
+ * instructions->tail_pred will point to the last instruction in the
+ * stream *after* processing the previous operand. If the two
+ * pointers match, then the previous operand had no effect.
+ *
+ * The warning behavior here differs slightly from GCC. GCC will
+ * only emit a warning if none of the left-hand operands have an
+ * effect. However, it will emit a warning for each. I believe that
+ * there are some cases in C (especially with GCC extensions) where
+ * it is useful to have an intermediate step in a sequence have no
+ * effect, but I don't think these cases exist in GLSL. Either way,
+ * it would be a giant hassle to replicate that behavior.
+ */
+ if (previous_tail_pred == instructions->tail_pred) {
+ _mesa_glsl_warning(&previous_operand_loc, state,
+ "left-hand operand of comma expression has "
+ "no effect");
+ }
+
+ /* tail_pred is directly accessed instead of using the get_tail()
+ * method for performance reasons. get_tail() has extra code to
+ * return NULL when the list is empty. We don't care about that
+ * here, so using tail_pred directly is fine.
+ */
+ previous_tail_pred = instructions->tail_pred;
+ previous_operand_loc = ast->get_location();
+
+ result = ast->hir(instructions, state);
+ }
+
+ /* Any errors should have already been emitted in the loop above.
+ */
+ error_emitted = true;
+ break;
+ }
+ }
+ type = NULL; /* use result->type, not type. */
+ assert(result != NULL);
+
+ if (result->type->is_error() && !error_emitted)
+ _mesa_glsl_error(& loc, state, "type mismatch");
+
+ return result;
+}
+
+
+ir_rvalue *
+ast_expression_statement::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ /* It is possible to have expression statements that don't have an
+ * expression. This is the solitary semicolon:
+ *
+ * for (i = 0; i < 5; i++)
+ * ;
+ *
+ * In this case the expression will be NULL. Test for NULL and don't do
+ * anything in that case.
+ */
+ if (expression != NULL)
+ expression->hir(instructions, state);
+
+ /* Statements do not have r-values.
+ */
+ return NULL;
+}
+
+
+ir_rvalue *
+ast_compound_statement::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ if (new_scope)
+ state->symbols->push_scope();
+
+ foreach_list_typed (ast_node, ast, link, &this->statements)
+ ast->hir(instructions, state);
+
+ if (new_scope)
+ state->symbols->pop_scope();
+
+ /* Compound statements do not have r-values.
+ */
+ return NULL;
+}
+
+
+static const glsl_type *
+process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size,
+ struct _mesa_glsl_parse_state *state)
+{
+ unsigned length = 0;
+
+ /* FINISHME: Reject delcarations of multidimensional arrays. */
+
+ if (array_size != NULL) {
+ exec_list dummy_instructions;
+ ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
+ YYLTYPE loc = array_size->get_location();
+
+ if (ir != NULL) {
+ if (!ir->type->is_integer()) {
+ _mesa_glsl_error(& loc, state, "array size must be integer type");
+ } else if (!ir->type->is_scalar()) {
+ _mesa_glsl_error(& loc, state, "array size must be scalar type");
+ } else {
+ ir_constant *const size = ir->constant_expression_value();
+
+ if (size == NULL) {
+ _mesa_glsl_error(& loc, state, "array size must be a "
+ "constant valued expression");
+ } else if (size->value.i[0] <= 0) {
+ _mesa_glsl_error(& loc, state, "array size must be > 0");
+ } else {
+ assert(size->type == ir->type);
+ length = size->value.u[0];
+
+ /* If the array size is const (and we've verified that
+ * it is) then no instructions should have been emitted
+ * when we converted it to HIR. If they were emitted,
+ * then either the array size isn't const after all, or
+ * we are emitting unnecessary instructions.
+ */
+ assert(dummy_instructions.is_empty());
+ }
+ }
+ }
+ } else if (state->es_shader) {
+ /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
+ * array declarations have been removed from the language.
+ */
+ _mesa_glsl_error(loc, state, "unsized array declarations are not "
+ "allowed in GLSL ES 1.00.");
+ }
+
+ return glsl_type::get_array_instance(base, length);
+}
+
+
+const glsl_type *
+ast_type_specifier::glsl_type(const char **name,
+ struct _mesa_glsl_parse_state *state) const
+{
+ const struct glsl_type *type;
+
+ type = state->symbols->get_type(this->type_name);
+ *name = this->type_name;
+
+ if (this->is_array) {
+ YYLTYPE loc = this->get_location();
+ type = process_array_type(&loc, type, this->array_size, state);
+ }
+
+ return type;
+}
+
+
+static void
+apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
+ ir_variable *var,
+ struct _mesa_glsl_parse_state *state,
+ YYLTYPE *loc)
+{
+ if (qual->flags.q.invariant) {
+ if (var->used) {
+ _mesa_glsl_error(loc, state,
+ "variable `%s' may not be redeclared "
+ "`invariant' after being used",
+ var->name);
+ } else {
+ var->invariant = 1;
+ }
+ }
+
+ if (qual->flags.q.constant || qual->flags.q.attribute
+ || qual->flags.q.uniform
+ || (qual->flags.q.varying && (state->target == fragment_shader)))
+ var->read_only = 1;
+
+ if (qual->flags.q.centroid)
+ var->centroid = 1;
+
+ if (qual->flags.q.attribute && state->target != vertex_shader) {
+ var->type = glsl_type::error_type;
+ _mesa_glsl_error(loc, state,
+ "`attribute' variables may not be declared in the "
+ "%s shader",
+ _mesa_glsl_shader_target_name(state->target));
+ }
+
+ /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "The varying qualifier can be used only with the data types
+ * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
+ * these."
+ */
+ if (qual->flags.q.varying) {
+ const glsl_type *non_array_type;
+
+ if (var->type && var->type->is_array())
+ non_array_type = var->type->fields.array;
+ else
+ non_array_type = var->type;
+
+ if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) {
+ var->type = glsl_type::error_type;
+ _mesa_glsl_error(loc, state,
+ "varying variables must be of base type float");
+ }
+ }
+
+ /* If there is no qualifier that changes the mode of the variable, leave
+ * the setting alone.
+ */
+ if (qual->flags.q.in && qual->flags.q.out)
+ var->mode = ir_var_inout;
+ else if (qual->flags.q.attribute || qual->flags.q.in
+ || (qual->flags.q.varying && (state->target == fragment_shader)))
+ var->mode = ir_var_in;
+ else if (qual->flags.q.out
+ || (qual->flags.q.varying && (state->target == vertex_shader)))
+ var->mode = ir_var_out;
+ else if (qual->flags.q.uniform)
+ var->mode = ir_var_uniform;
+
+ if (state->all_invariant && (state->current_function == NULL)) {
+ switch (state->target) {
+ case vertex_shader:
+ if (var->mode == ir_var_out)
+ var->invariant = true;
+ break;
+ case geometry_shader:
+ if ((var->mode == ir_var_in) || (var->mode == ir_var_out))
+ var->invariant = true;
+ break;
+ case fragment_shader:
+ if (var->mode == ir_var_in)
+ var->invariant = true;
+ break;
+ }
+ }
+
+ if (qual->flags.q.flat)
+ var->interpolation = ir_var_flat;
+ else if (qual->flags.q.noperspective)
+ var->interpolation = ir_var_noperspective;
+ else
+ var->interpolation = ir_var_smooth;
+
+ var->pixel_center_integer = qual->flags.q.pixel_center_integer;
+ var->origin_upper_left = qual->flags.q.origin_upper_left;
+ if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer)
+ && (strcmp(var->name, "gl_FragCoord") != 0)) {
+ const char *const qual_string = (qual->flags.q.origin_upper_left)
+ ? "origin_upper_left" : "pixel_center_integer";
+
+ _mesa_glsl_error(loc, state,
+ "layout qualifier `%s' can only be applied to "
+ "fragment shader input `gl_FragCoord'",
+ qual_string);
+ }
+
+ if (qual->flags.q.explicit_location) {
+ const bool global_scope = (state->current_function == NULL);
+ bool fail = false;
+ const char *string = "";
+
+ /* In the vertex shader only shader inputs can be given explicit
+ * locations.
+ *
+ * In the fragment shader only shader outputs can be given explicit
+ * locations.
+ */
+ switch (state->target) {
+ case vertex_shader:
+ if (!global_scope || (var->mode != ir_var_in)) {
+ fail = true;
+ string = "input";
+ }
+ break;
+
+ case geometry_shader:
+ _mesa_glsl_error(loc, state,
+ "geometry shader variables cannot be given "
+ "explicit locations\n");
+ break;
+
+ case fragment_shader:
+ if (!global_scope || (var->mode != ir_var_out)) {
+ fail = true;
+ string = "output";
+ }
+ break;
+ };
+
+ if (fail) {
+ _mesa_glsl_error(loc, state,
+ "only %s shader %s variables can be given an "
+ "explicit location\n",
+ _mesa_glsl_shader_target_name(state->target),
+ string);
+ } else {
+ var->explicit_location = true;
+
+ /* This bit of silliness is needed because invalid explicit locations
+ * are supposed to be flagged during linking. Small negative values
+ * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
+ * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
+ * The linker needs to be able to differentiate these cases. This
+ * ensures that negative values stay negative.
+ */
+ if (qual->location >= 0) {
+ var->location = (state->target == vertex_shader)
+ ? (qual->location + VERT_ATTRIB_GENERIC0)
+ : (qual->location + FRAG_RESULT_DATA0);
+ } else {
+ var->location = qual->location;
+ }
+ }
+ }
+
+ /* Does the declaration use the 'layout' keyword?
+ */
+ const bool uses_layout = qual->flags.q.pixel_center_integer
+ || qual->flags.q.origin_upper_left
+ || qual->flags.q.explicit_location;
+
+ /* Does the declaration use the deprecated 'attribute' or 'varying'
+ * keywords?
+ */
+ const bool uses_deprecated_qualifier = qual->flags.q.attribute
+ || qual->flags.q.varying;
+
+ /* Is the 'layout' keyword used with parameters that allow relaxed checking.
+ * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
+ * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
+ * allowed the layout qualifier to be used with 'varying' and 'attribute'.
+ * These extensions and all following extensions that add the 'layout'
+ * keyword have been modified to require the use of 'in' or 'out'.
+ *
+ * The following extension do not allow the deprecated keywords:
+ *
+ * GL_AMD_conservative_depth
+ * GL_ARB_gpu_shader5
+ * GL_ARB_separate_shader_objects
+ * GL_ARB_tesselation_shader
+ * GL_ARB_transform_feedback3
+ * GL_ARB_uniform_buffer_object
+ *
+ * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
+ * allow layout with the deprecated keywords.
+ */
+ const bool relaxed_layout_qualifier_checking =
+ state->ARB_fragment_coord_conventions_enable;
+
+ if (uses_layout && uses_deprecated_qualifier) {
+ if (relaxed_layout_qualifier_checking) {
+ _mesa_glsl_warning(loc, state,
+ "`layout' qualifier may not be used with "
+ "`attribute' or `varying'");
+ } else {
+ _mesa_glsl_error(loc, state,
+ "`layout' qualifier may not be used with "
+ "`attribute' or `varying'");
+ }
+ }
+
+ /* Layout qualifiers for gl_FragDepth, which are enabled by extension
+ * AMD_conservative_depth.
+ */
+ int depth_layout_count = qual->flags.q.depth_any
+ + qual->flags.q.depth_greater
+ + qual->flags.q.depth_less
+ + qual->flags.q.depth_unchanged;
+ if (depth_layout_count > 0
+ && !state->AMD_conservative_depth_enable) {
+ _mesa_glsl_error(loc, state,
+ "extension GL_AMD_conservative_depth must be enabled "
+ "to use depth layout qualifiers");
+ } else if (depth_layout_count > 0
+ && strcmp(var->name, "gl_FragDepth") != 0) {
+ _mesa_glsl_error(loc, state,
+ "depth layout qualifiers can be applied only to "
+ "gl_FragDepth");
+ } else if (depth_layout_count > 1
+ && strcmp(var->name, "gl_FragDepth") == 0) {
+ _mesa_glsl_error(loc, state,
+ "at most one depth layout qualifier can be applied to "
+ "gl_FragDepth");
+ }
+ if (qual->flags.q.depth_any)
+ var->depth_layout = ir_depth_layout_any;
+ else if (qual->flags.q.depth_greater)
+ var->depth_layout = ir_depth_layout_greater;
+ else if (qual->flags.q.depth_less)
+ var->depth_layout = ir_depth_layout_less;
+ else if (qual->flags.q.depth_unchanged)
+ var->depth_layout = ir_depth_layout_unchanged;
+ else
+ var->depth_layout = ir_depth_layout_none;
+
+ /* From page 46 (page 52 of the PDF) of the GLSL ES specification:
+ *
+ * "Array variables are l-values and may be passed to parameters
+ * declared as out or inout. However, they may not be used as
+ * the target of an assignment."
+ *
+ * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "Other binary or unary expressions, non-dereferenced arrays,
+ * function names, swizzles with repeated fields, and constants
+ * cannot be l-values."
+ *
+ * So we only mark 1.10 as non-lvalues, and check for array
+ * assignment in 100 specifically in do_assignment.
+ */
+ if (var->type->is_array() && state->language_version != 110) {
+ var->array_lvalue = true;
+ }
+}
+
+/**
+ * Get the variable that is being redeclared by this declaration
+ *
+ * Semantic checks to verify the validity of the redeclaration are also
+ * performed. If semantic checks fail, compilation error will be emitted via
+ * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
+ *
+ * \returns
+ * A pointer to an existing variable in the current scope if the declaration
+ * is a redeclaration, \c NULL otherwise.
+ */
+ir_variable *
+get_variable_being_redeclared(ir_variable *var, ast_declaration *decl,
+ struct _mesa_glsl_parse_state *state)
+{
+ /* Check if this declaration is actually a re-declaration, either to
+ * resize an array or add qualifiers to an existing variable.
+ *
+ * This is allowed for variables in the current scope, or when at
+ * global scope (for built-ins in the implicit outer scope).
+ */
+ ir_variable *earlier = state->symbols->get_variable(decl->identifier);
+ if (earlier == NULL ||
+ (state->current_function != NULL &&
+ !state->symbols->name_declared_this_scope(decl->identifier))) {
+ return NULL;
+ }
+
+
+ YYLTYPE loc = decl->get_location();
+
+ /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
+ *
+ * "It is legal to declare an array without a size and then
+ * later re-declare the same name as an array of the same
+ * type and specify a size."
+ */
+ if ((earlier->type->array_size() == 0)
+ && var->type->is_array()
+ && (var->type->element_type() == earlier->type->element_type())) {
+ /* FINISHME: This doesn't match the qualifiers on the two
+ * FINISHME: declarations. It's not 100% clear whether this is
+ * FINISHME: required or not.
+ */
+
+ const unsigned size = unsigned(var->type->array_size());
+ check_builtin_array_max_size(var->name, size, loc, state);
+ if ((size > 0) && (size <= earlier->max_array_access)) {
+ _mesa_glsl_error(& loc, state, "array size must be > %u due to "
+ "previous access",
+ earlier->max_array_access);
+ }
+
+ earlier->type = var->type;
+ delete var;
+ var = NULL;
+ } else if (state->ARB_fragment_coord_conventions_enable
+ && strcmp(var->name, "gl_FragCoord") == 0
+ && earlier->type == var->type
+ && earlier->mode == var->mode) {
+ /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
+ * qualifiers.
+ */
+ earlier->origin_upper_left = var->origin_upper_left;
+ earlier->pixel_center_integer = var->pixel_center_integer;
+
+ /* According to section 4.3.7 of the GLSL 1.30 spec,
+ * the following built-in varaibles can be redeclared with an
+ * interpolation qualifier:
+ * * gl_FrontColor
+ * * gl_BackColor
+ * * gl_FrontSecondaryColor
+ * * gl_BackSecondaryColor
+ * * gl_Color
+ * * gl_SecondaryColor
+ */
+ } else if (state->language_version >= 130
+ && (strcmp(var->name, "gl_FrontColor") == 0
+ || strcmp(var->name, "gl_BackColor") == 0
+ || strcmp(var->name, "gl_FrontSecondaryColor") == 0
+ || strcmp(var->name, "gl_BackSecondaryColor") == 0
+ || strcmp(var->name, "gl_Color") == 0
+ || strcmp(var->name, "gl_SecondaryColor") == 0)
+ && earlier->type == var->type
+ && earlier->mode == var->mode) {
+ earlier->interpolation = var->interpolation;
+
+ /* Layout qualifiers for gl_FragDepth. */
+ } else if (state->AMD_conservative_depth_enable
+ && strcmp(var->name, "gl_FragDepth") == 0
+ && earlier->type == var->type
+ && earlier->mode == var->mode) {
+
+ /** From the AMD_conservative_depth spec:
+ * Within any shader, the first redeclarations of gl_FragDepth
+ * must appear before any use of gl_FragDepth.
+ */
+ if (earlier->used) {
+ _mesa_glsl_error(&loc, state,
+ "the first redeclaration of gl_FragDepth "
+ "must appear before any use of gl_FragDepth");
+ }
+
+ /* Prevent inconsistent redeclaration of depth layout qualifier. */
+ if (earlier->depth_layout != ir_depth_layout_none
+ && earlier->depth_layout != var->depth_layout) {
+ _mesa_glsl_error(&loc, state,
+ "gl_FragDepth: depth layout is declared here "
+ "as '%s, but it was previously declared as "
+ "'%s'",
+ depth_layout_string(var->depth_layout),
+ depth_layout_string(earlier->depth_layout));
+ }
+
+ earlier->depth_layout = var->depth_layout;
+
+ } else {
+ _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier);
+ }
+
+ return earlier;
+}
+
+/**
+ * Generate the IR for an initializer in a variable declaration
+ */
+ir_rvalue *
+process_initializer(ir_variable *var, ast_declaration *decl,
+ ast_fully_specified_type *type,
+ exec_list *initializer_instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ ir_rvalue *result = NULL;
+
+ YYLTYPE initializer_loc = decl->initializer->get_location();
+
+ /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "All uniform variables are read-only and are initialized either
+ * directly by an application via API commands, or indirectly by
+ * OpenGL."
+ */
+ if ((state->language_version <= 110)
+ && (var->mode == ir_var_uniform)) {
+ _mesa_glsl_error(& initializer_loc, state,
+ "cannot initialize uniforms in GLSL 1.10");
+ }
+
+ if (var->type->is_sampler()) {
+ _mesa_glsl_error(& initializer_loc, state,
+ "cannot initialize samplers");
+ }
+
+ if ((var->mode == ir_var_in) && (state->current_function == NULL)) {
+ _mesa_glsl_error(& initializer_loc, state,
+ "cannot initialize %s shader input / %s",
+ _mesa_glsl_shader_target_name(state->target),
+ (state->target == vertex_shader)
+ ? "attribute" : "varying");
+ }
+
+ ir_dereference *const lhs = new(state) ir_dereference_variable(var);
+ ir_rvalue *rhs = decl->initializer->hir(initializer_instructions,
+ state);
+
+ /* Calculate the constant value if this is a const or uniform
+ * declaration.
+ */
+ if (type->qualifier.flags.q.constant
+ || type->qualifier.flags.q.uniform) {
+ ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs, true);
+ if (new_rhs != NULL) {
+ rhs = new_rhs;
+
+ ir_constant *constant_value = rhs->constant_expression_value();
+ if (!constant_value) {
+ _mesa_glsl_error(& initializer_loc, state,
+ "initializer of %s variable `%s' must be a "
+ "constant expression",
+ (type->qualifier.flags.q.constant)
+ ? "const" : "uniform",
+ decl->identifier);
+ if (var->type->is_numeric()) {
+ /* Reduce cascading errors. */
+ var->constant_value = ir_constant::zero(state, var->type);
+ }
+ } else {
+ rhs = constant_value;
+ var->constant_value = constant_value;
+ }
+ } else {
+ _mesa_glsl_error(&initializer_loc, state,
+ "initializer of type %s cannot be assigned to "
+ "variable of type %s",
+ rhs->type->name, var->type->name);
+ if (var->type->is_numeric()) {
+ /* Reduce cascading errors. */
+ var->constant_value = ir_constant::zero(state, var->type);
+ }
+ }
+ }
+
+ if (rhs && !rhs->type->is_error()) {
+ bool temp = var->read_only;
+ if (type->qualifier.flags.q.constant)
+ var->read_only = false;
+
+ /* Never emit code to initialize a uniform.
+ */
+ const glsl_type *initializer_type;
+ if (!type->qualifier.flags.q.uniform) {
+ result = do_assignment(initializer_instructions, state,
+ lhs, rhs, true,
+ type->get_location());
+ initializer_type = result->type;
+ } else
+ initializer_type = rhs->type;
+
+ /* If the declared variable is an unsized array, it must inherrit
+ * its full type from the initializer. A declaration such as
+ *
+ * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
+ *
+ * becomes
+ *
+ * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
+ *
+ * The assignment generated in the if-statement (below) will also
+ * automatically handle this case for non-uniforms.
+ *
+ * If the declared variable is not an array, the types must
+ * already match exactly. As a result, the type assignment
+ * here can be done unconditionally. For non-uniforms the call
+ * to do_assignment can change the type of the initializer (via
+ * the implicit conversion rules). For uniforms the initializer
+ * must be a constant expression, and the type of that expression
+ * was validated above.
+ */
+ var->type = initializer_type;
+
+ var->read_only = temp;
+ }
+
+ return result;
+}
+
+ir_rvalue *
+ast_declarator_list::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ void *ctx = state;
+ const struct glsl_type *decl_type;
+ const char *type_name = NULL;
+ ir_rvalue *result = NULL;
+ YYLTYPE loc = this->get_location();
+
+ /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "To ensure that a particular output variable is invariant, it is
+ * necessary to use the invariant qualifier. It can either be used to
+ * qualify a previously declared variable as being invariant
+ *
+ * invariant gl_Position; // make existing gl_Position be invariant"
+ *
+ * In these cases the parser will set the 'invariant' flag in the declarator
+ * list, and the type will be NULL.
+ */
+ if (this->invariant) {
+ assert(this->type == NULL);
+
+ if (state->current_function != NULL) {
+ _mesa_glsl_error(& loc, state,
+ "All uses of `invariant' keyword must be at global "
+ "scope\n");
+ }
+
+ foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
+ assert(!decl->is_array);
+ assert(decl->array_size == NULL);
+ assert(decl->initializer == NULL);
+
+ ir_variable *const earlier =
+ state->symbols->get_variable(decl->identifier);
+ if (earlier == NULL) {
+ _mesa_glsl_error(& loc, state,
+ "Undeclared variable `%s' cannot be marked "
+ "invariant\n", decl->identifier);
+ } else if ((state->target == vertex_shader)
+ && (earlier->mode != ir_var_out)) {
+ _mesa_glsl_error(& loc, state,
+ "`%s' cannot be marked invariant, vertex shader "
+ "outputs only\n", decl->identifier);
+ } else if ((state->target == fragment_shader)
+ && (earlier->mode != ir_var_in)) {
+ _mesa_glsl_error(& loc, state,
+ "`%s' cannot be marked invariant, fragment shader "
+ "inputs only\n", decl->identifier);
+ } else if (earlier->used) {
+ _mesa_glsl_error(& loc, state,
+ "variable `%s' may not be redeclared "
+ "`invariant' after being used",
+ earlier->name);
+ } else {
+ earlier->invariant = true;
+ }
+ }
+
+ /* Invariant redeclarations do not have r-values.
+ */
+ return NULL;
+ }
+
+ assert(this->type != NULL);
+ assert(!this->invariant);
+
+ /* The type specifier may contain a structure definition. Process that
+ * before any of the variable declarations.
+ */
+ (void) this->type->specifier->hir(instructions, state);
+
+ decl_type = this->type->specifier->glsl_type(& type_name, state);
+ if (this->declarations.is_empty()) {
+ if (decl_type != NULL) {
+ /* Warn if this empty declaration is not for declaring a structure.
+ */
+ if (this->type->specifier->structure == NULL) {
+ _mesa_glsl_warning(&loc, state, "empty declaration");
+ }
+ } else {
+ _mesa_glsl_error(& loc, state, "incomplete declaration");
+ }
+ }
+
+ foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
+ const struct glsl_type *var_type;
+ ir_variable *var;
+
+ /* FINISHME: Emit a warning if a variable declaration shadows a
+ * FINISHME: declaration at a higher scope.
+ */
+
+ if ((decl_type == NULL) || decl_type->is_void()) {
+ if (type_name != NULL) {
+ _mesa_glsl_error(& loc, state,
+ "invalid type `%s' in declaration of `%s'",
+ type_name, decl->identifier);
+ } else {
+ _mesa_glsl_error(& loc, state,
+ "invalid type in declaration of `%s'",
+ decl->identifier);
+ }
+ continue;
+ }
+
+ if (decl->is_array) {
+ var_type = process_array_type(&loc, decl_type, decl->array_size,
+ state);
+ } else {
+ var_type = decl_type;
+ }
+
+ var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto);
+
+ /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
+ *
+ * "Global variables can only use the qualifiers const,
+ * attribute, uni form, or varying. Only one may be
+ * specified.
+ *
+ * Local variables can only use the qualifier const."
+ *
+ * This is relaxed in GLSL 1.30. It is also relaxed by any extension
+ * that adds the 'layout' keyword.
+ */
+ if ((state->language_version < 130)
+ && !state->ARB_explicit_attrib_location_enable
+ && !state->ARB_fragment_coord_conventions_enable) {
+ if (this->type->qualifier.flags.q.out) {
+ _mesa_glsl_error(& loc, state,
+ "`out' qualifier in declaration of `%s' "
+ "only valid for function parameters in %s.",
+ decl->identifier, state->version_string);
+ }
+ if (this->type->qualifier.flags.q.in) {
+ _mesa_glsl_error(& loc, state,
+ "`in' qualifier in declaration of `%s' "
+ "only valid for function parameters in %s.",
+ decl->identifier, state->version_string);
+ }
+ /* FINISHME: Test for other invalid qualifiers. */
+ }
+
+ apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
+ & loc);
+
+ if (this->type->qualifier.flags.q.invariant) {
+ if ((state->target == vertex_shader) && !(var->mode == ir_var_out ||
+ var->mode == ir_var_inout)) {
+ /* FINISHME: Note that this doesn't work for invariant on
+ * a function signature outval
+ */
+ _mesa_glsl_error(& loc, state,
+ "`%s' cannot be marked invariant, vertex shader "
+ "outputs only\n", var->name);
+ } else if ((state->target == fragment_shader) &&
+ !(var->mode == ir_var_in || var->mode == ir_var_inout)) {
+ /* FINISHME: Note that this doesn't work for invariant on
+ * a function signature inval
+ */
+ _mesa_glsl_error(& loc, state,
+ "`%s' cannot be marked invariant, fragment shader "
+ "inputs only\n", var->name);
+ }
+ }
+
+ if (state->current_function != NULL) {
+ const char *mode = NULL;
+ const char *extra = "";
+
+ /* There is no need to check for 'inout' here because the parser will
+ * only allow that in function parameter lists.
+ */
+ if (this->type->qualifier.flags.q.attribute) {
+ mode = "attribute";
+ } else if (this->type->qualifier.flags.q.uniform) {
+ mode = "uniform";
+ } else if (this->type->qualifier.flags.q.varying) {
+ mode = "varying";
+ } else if (this->type->qualifier.flags.q.in) {
+ mode = "in";
+ extra = " or in function parameter list";
+ } else if (this->type->qualifier.flags.q.out) {
+ mode = "out";
+ extra = " or in function parameter list";
+ }
+
+ if (mode) {
+ _mesa_glsl_error(& loc, state,
+ "%s variable `%s' must be declared at "
+ "global scope%s",
+ mode, var->name, extra);
+ }
+ } else if (var->mode == ir_var_in) {
+ var->read_only = true;
+
+ if (state->target == vertex_shader) {
+ bool error_emitted = false;
+
+ /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "Vertex shader inputs can only be float, floating-point
+ * vectors, matrices, signed and unsigned integers and integer
+ * vectors. Vertex shader inputs can also form arrays of these
+ * types, but not structures."
+ *
+ * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
+ *
+ * "Vertex shader inputs can only be float, floating-point
+ * vectors, matrices, signed and unsigned integers and integer
+ * vectors. They cannot be arrays or structures."
+ *
+ * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
+ *
+ * "The attribute qualifier can be used only with float,
+ * floating-point vectors, and matrices. Attribute variables
+ * cannot be declared as arrays or structures."
+ */
+ const glsl_type *check_type = var->type->is_array()
+ ? var->type->fields.array : var->type;
+
+ switch (check_type->base_type) {
+ case GLSL_TYPE_FLOAT:
+ break;
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT:
+ if (state->language_version > 120)
+ break;
+ /* FALLTHROUGH */
+ default:
+ _mesa_glsl_error(& loc, state,
+ "vertex shader input / attribute cannot have "
+ "type %s`%s'",
+ var->type->is_array() ? "array of " : "",
+ check_type->name);
+ error_emitted = true;
+ }
+
+ if (!error_emitted && (state->language_version <= 130)
+ && var->type->is_array()) {
+ _mesa_glsl_error(& loc, state,
+ "vertex shader input / attribute cannot have "
+ "array type");
+ error_emitted = true;
+ }
+ }
+ }
+
+ /* Integer vertex outputs must be qualified with 'flat'.
+ *
+ * From section 4.3.6 of the GLSL 1.30 spec:
+ * "If a vertex output is a signed or unsigned integer or integer
+ * vector, then it must be qualified with the interpolation qualifier
+ * flat."
+ */
+ if (state->language_version >= 130
+ && state->target == vertex_shader
+ && state->current_function == NULL
+ && var->type->is_integer()
+ && var->mode == ir_var_out
+ && var->interpolation != ir_var_flat) {
+
+ _mesa_glsl_error(&loc, state, "If a vertex output is an integer, "
+ "then it must be qualified with 'flat'");
+ }
+
+
+ /* Interpolation qualifiers cannot be applied to 'centroid' and
+ * 'centroid varying'.
+ *
+ * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
+ * "interpolation qualifiers may only precede the qualifiers in,
+ * centroid in, out, or centroid out in a declaration. They do not apply
+ * to the deprecated storage qualifiers varying or centroid varying."
+ */
+ if (state->language_version >= 130
+ && this->type->qualifier.has_interpolation()
+ && this->type->qualifier.flags.q.varying) {
+
+ const char *i = this->type->qualifier.interpolation_string();
+ assert(i != NULL);
+ const char *s;
+ if (this->type->qualifier.flags.q.centroid)
+ s = "centroid varying";
+ else
+ s = "varying";
+
+ _mesa_glsl_error(&loc, state,
+ "qualifier '%s' cannot be applied to the "
+ "deprecated storage qualifier '%s'", i, s);
+ }
+
+
+ /* Interpolation qualifiers can only apply to vertex shader outputs and
+ * fragment shader inputs.
+ *
+ * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
+ * "Outputs from a vertex shader (out) and inputs to a fragment
+ * shader (in) can be further qualified with one or more of these
+ * interpolation qualifiers"
+ */
+ if (state->language_version >= 130
+ && this->type->qualifier.has_interpolation()) {
+
+ const char *i = this->type->qualifier.interpolation_string();
+ assert(i != NULL);
+
+ switch (state->target) {
+ case vertex_shader:
+ if (this->type->qualifier.flags.q.in) {
+ _mesa_glsl_error(&loc, state,
+ "qualifier '%s' cannot be applied to vertex "
+ "shader inputs", i);
+ }
+ break;
+ case fragment_shader:
+ if (this->type->qualifier.flags.q.out) {
+ _mesa_glsl_error(&loc, state,
+ "qualifier '%s' cannot be applied to fragment "
+ "shader outputs", i);
+ }
+ break;
+ default:
+ assert(0);
+ }
+ }
+
+
+ /* From section 4.3.4 of the GLSL 1.30 spec:
+ * "It is an error to use centroid in in a vertex shader."
+ */
+ if (state->language_version >= 130
+ && this->type->qualifier.flags.q.centroid
+ && this->type->qualifier.flags.q.in
+ && state->target == vertex_shader) {
+
+ _mesa_glsl_error(&loc, state,
+ "'centroid in' cannot be used in a vertex shader");
+ }
+
+
+ /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
+ */
+ if (this->type->specifier->precision != ast_precision_none
+ && state->language_version != 100
+ && state->language_version < 130) {
+
+ _mesa_glsl_error(&loc, state,
+ "precision qualifiers are supported only in GLSL ES "
+ "1.00, and GLSL 1.30 and later");
+ }
+
+
+ /* Precision qualifiers only apply to floating point and integer types.
+ *
+ * From section 4.5.2 of the GLSL 1.30 spec:
+ * "Any floating point or any integer declaration can have the type
+ * preceded by one of these precision qualifiers [...] Literal
+ * constants do not have precision qualifiers. Neither do Boolean
+ * variables.
+ *
+ * In GLSL ES, sampler types are also allowed.
+ *
+ * From page 87 of the GLSL ES spec:
+ * "RESOLUTION: Allow sampler types to take a precision qualifier."
+ */
+ if (this->type->specifier->precision != ast_precision_none
+ && !var->type->is_float()
+ && !var->type->is_integer()
+ && !(var->type->is_sampler() && state->es_shader)
+ && !(var->type->is_array()
+ && (var->type->fields.array->is_float()
+ || var->type->fields.array->is_integer()))) {
+
+ _mesa_glsl_error(&loc, state,
+ "precision qualifiers apply only to floating point"
+ "%s types", state->es_shader ? ", integer, and sampler"
+ : "and integer");
+ }
+
+ /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
+ *
+ * "[Sampler types] can only be declared as function
+ * parameters or uniform variables (see Section 4.3.5
+ * "Uniform")".
+ */
+ if (var_type->contains_sampler() &&
+ !this->type->qualifier.flags.q.uniform) {
+ _mesa_glsl_error(&loc, state, "samplers must be declared uniform");
+ }
+
+ /* Process the initializer and add its instructions to a temporary
+ * list. This list will be added to the instruction stream (below) after
+ * the declaration is added. This is done because in some cases (such as
+ * redeclarations) the declaration may not actually be added to the
+ * instruction stream.
+ */
+ exec_list initializer_instructions;
+ ir_variable *earlier = get_variable_being_redeclared(var, decl, state);
+
+ if (decl->initializer != NULL) {
+ result = process_initializer((earlier == NULL) ? var : earlier,
+ decl, this->type,
+ &initializer_instructions, state);
+ }
+
+ /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "It is an error to write to a const variable outside of
+ * its declaration, so they must be initialized when
+ * declared."
+ */
+ if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) {
+ _mesa_glsl_error(& loc, state,
+ "const declaration of `%s' must be initialized",
+ decl->identifier);
+ }
+
+ /* If the declaration is not a redeclaration, there are a few additional
+ * semantic checks that must be applied. In addition, variable that was
+ * created for the declaration should be added to the IR stream.
+ */
+ if (earlier == NULL) {
+ /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
+ *
+ * "Identifiers starting with "gl_" are reserved for use by
+ * OpenGL, and may not be declared in a shader as either a
+ * variable or a function."
+ */
+ if (strncmp(decl->identifier, "gl_", 3) == 0)
+ _mesa_glsl_error(& loc, state,
+ "identifier `%s' uses reserved `gl_' prefix",
+ decl->identifier);
+
+ /* Add the variable to the symbol table. Note that the initializer's
+ * IR was already processed earlier (though it hasn't been emitted
+ * yet), without the variable in scope.
+ *
+ * This differs from most C-like languages, but it follows the GLSL
+ * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
+ * spec:
+ *
+ * "Within a declaration, the scope of a name starts immediately
+ * after the initializer if present or immediately after the name
+ * being declared if not."
+ */
+ if (!state->symbols->add_variable(var)) {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
+ "current scope", decl->identifier);
+ continue;
+ }
+
+ /* Push the variable declaration to the top. It means that all the
+ * variable declarations will appear in a funny last-to-first order,
+ * but otherwise we run into trouble if a function is prototyped, a
+ * global var is decled, then the function is defined with usage of
+ * the global var. See glslparsertest's CorrectModule.frag.
+ */
+ instructions->push_head(var);
+ }
+
+ instructions->append_list(&initializer_instructions);
+ }
+
+
+ /* Generally, variable declarations do not have r-values. However,
+ * one is used for the declaration in
+ *
+ * while (bool b = some_condition()) {
+ * ...
+ * }
+ *
+ * so we return the rvalue from the last seen declaration here.
+ */
+ return result;
+}
+
+
+ir_rvalue *
+ast_parameter_declarator::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ void *ctx = state;
+ const struct glsl_type *type;
+ const char *name = NULL;
+ YYLTYPE loc = this->get_location();
+
+ type = this->type->specifier->glsl_type(& name, state);
+
+ if (type == NULL) {
+ if (name != NULL) {
+ _mesa_glsl_error(& loc, state,
+ "invalid type `%s' in declaration of `%s'",
+ name, this->identifier);
+ } else {
+ _mesa_glsl_error(& loc, state,
+ "invalid type in declaration of `%s'",
+ this->identifier);
+ }
+
+ type = glsl_type::error_type;
+ }
+
+ /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "Functions that accept no input arguments need not use void in the
+ * argument list because prototypes (or definitions) are required and
+ * therefore there is no ambiguity when an empty argument list "( )" is
+ * declared. The idiom "(void)" as a parameter list is provided for
+ * convenience."
+ *
+ * Placing this check here prevents a void parameter being set up
+ * for a function, which avoids tripping up checks for main taking
+ * parameters and lookups of an unnamed symbol.
+ */
+ if (type->is_void()) {
+ if (this->identifier != NULL)
+ _mesa_glsl_error(& loc, state,
+ "named parameter cannot have type `void'");
+
+ is_void = true;
+ return NULL;
+ }
+
+ if (formal_parameter && (this->identifier == NULL)) {
+ _mesa_glsl_error(& loc, state, "formal parameter lacks a name");
+ return NULL;
+ }
+
+ /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
+ * call already handled the "vec4[..] foo" case.
+ */
+ if (this->is_array) {
+ type = process_array_type(&loc, type, this->array_size, state);
+ }
+
+ if (type->array_size() == 0) {
+ _mesa_glsl_error(&loc, state, "arrays passed as parameters must have "
+ "a declared size.");
+ type = glsl_type::error_type;
+ }
+
+ is_void = false;
+ ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in);
+
+ /* Apply any specified qualifiers to the parameter declaration. Note that
+ * for function parameters the default mode is 'in'.
+ */
+ apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc);
+
+ /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
+ *
+ * "Samplers cannot be treated as l-values; hence cannot be used
+ * as out or inout function parameters, nor can they be assigned
+ * into."
+ */
+ if ((var->mode == ir_var_inout || var->mode == ir_var_out)
+ && type->contains_sampler()) {
+ _mesa_glsl_error(&loc, state, "out and inout parameters cannot contain samplers");
+ type = glsl_type::error_type;
+ }
+
+ instructions->push_tail(var);
+
+ /* Parameter declarations do not have r-values.
+ */
+ return NULL;
+}
+
+
+void
+ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters,
+ bool formal,
+ exec_list *ir_parameters,
+ _mesa_glsl_parse_state *state)
+{
+ ast_parameter_declarator *void_param = NULL;
+ unsigned count = 0;
+
+ foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) {
+ param->formal_parameter = formal;
+ param->hir(ir_parameters, state);
+
+ if (param->is_void)
+ void_param = param;
+
+ count++;
+ }
+
+ if ((void_param != NULL) && (count > 1)) {
+ YYLTYPE loc = void_param->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "`void' parameter must be only parameter");
+ }
+}
+
+
+void
+emit_function(_mesa_glsl_parse_state *state, ir_function *f)
+{
+ /* IR invariants disallow function declarations or definitions
+ * nested within other function definitions. But there is no
+ * requirement about the relative order of function declarations
+ * and definitions with respect to one another. So simply insert
+ * the new ir_function block at the end of the toplevel instruction
+ * list.
+ */
+ state->toplevel_ir->push_tail(f);
+}
+
+
+ir_rvalue *
+ast_function::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ void *ctx = state;
+ ir_function *f = NULL;
+ ir_function_signature *sig = NULL;
+ exec_list hir_parameters;
+
+ const char *const name = identifier;
+
+ /* New functions are always added to the top-level IR instruction stream,
+ * so this instruction list pointer is ignored. See also emit_function
+ * (called below).
+ */
+ (void) instructions;
+
+ /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
+ *
+ * "Function declarations (prototypes) cannot occur inside of functions;
+ * they must be at global scope, or for the built-in functions, outside
+ * the global scope."
+ *
+ * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
+ *
+ * "User defined functions may only be defined within the global scope."
+ *
+ * Note that this language does not appear in GLSL 1.10.
+ */
+ if ((state->current_function != NULL) && (state->language_version != 110)) {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(&loc, state,
+ "declaration of function `%s' not allowed within "
+ "function body", name);
+ }
+
+ /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
+ *
+ * "Identifiers starting with "gl_" are reserved for use by
+ * OpenGL, and may not be declared in a shader as either a
+ * variable or a function."
+ */
+ if (strncmp(name, "gl_", 3) == 0) {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(&loc, state,
+ "identifier `%s' uses reserved `gl_' prefix", name);
+ }
+
+ /* Convert the list of function parameters to HIR now so that they can be
+ * used below to compare this function's signature with previously seen
+ * signatures for functions with the same name.
+ */
+ ast_parameter_declarator::parameters_to_hir(& this->parameters,
+ is_definition,
+ & hir_parameters, state);
+
+ const char *return_type_name;
+ const glsl_type *return_type =
+ this->return_type->specifier->glsl_type(& return_type_name, state);
+
+ if (!return_type) {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(&loc, state,
+ "function `%s' has undeclared return type `%s'",
+ name, return_type_name);
+ return_type = glsl_type::error_type;
+ }
+
+ /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
+ * "No qualifier is allowed on the return type of a function."
+ */
+ if (this->return_type->has_qualifiers()) {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(& loc, state,
+ "function `%s' return type has qualifiers", name);
+ }
+
+ /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
+ *
+ * "[Sampler types] can only be declared as function parameters
+ * or uniform variables (see Section 4.3.5 "Uniform")".
+ */
+ if (return_type->contains_sampler()) {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(&loc, state,
+ "function `%s' return type can't contain a sampler",
+ name);
+ }
+
+ /* Verify that this function's signature either doesn't match a previously
+ * seen signature for a function with the same name, or, if a match is found,
+ * that the previously seen signature does not have an associated definition.
+ */
+ f = state->symbols->get_function(name);
+ if (f != NULL && (state->es_shader || f->has_user_signature())) {
+ sig = f->exact_matching_signature(&hir_parameters);
+ if (sig != NULL) {
+ const char *badvar = sig->qualifiers_match(&hir_parameters);
+ if (badvar != NULL) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' "
+ "qualifiers don't match prototype", name, badvar);
+ }
+
+ if (sig->return_type != return_type) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(&loc, state, "function `%s' return type doesn't "
+ "match prototype", name);
+ }
+
+ if (is_definition && sig->is_defined) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state, "function `%s' redefined", name);
+ }
+ }
+ } else {
+ f = new(ctx) ir_function(name);
+ if (!state->symbols->add_function(f)) {
+ /* This function name shadows a non-function use of the same name. */
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(&loc, state, "function name `%s' conflicts with "
+ "non-function", name);
+ return NULL;
+ }
+
+ emit_function(state, f);
+ }
+
+ /* Verify the return type of main() */
+ if (strcmp(name, "main") == 0) {
+ if (! return_type->is_void()) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state, "main() must return void");
+ }
+
+ if (!hir_parameters.is_empty()) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state, "main() must not take any parameters");
+ }
+ }
+
+ /* Finish storing the information about this new function in its signature.
+ */
+ if (sig == NULL) {
+ sig = new(ctx) ir_function_signature(return_type);
+ f->add_signature(sig);
+ }
+
+ sig->replace_parameters(&hir_parameters);
+ signature = sig;
+
+ /* Function declarations (prototypes) do not have r-values.
+ */
+ return NULL;
+}
+
+
+ir_rvalue *
+ast_function_definition::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ prototype->is_definition = true;
+ prototype->hir(instructions, state);
+
+ ir_function_signature *signature = prototype->signature;
+ if (signature == NULL)
+ return NULL;
+
+ assert(state->current_function == NULL);
+ state->current_function = signature;
+ state->found_return = false;
+
+ /* Duplicate parameters declared in the prototype as concrete variables.
+ * Add these to the symbol table.
+ */
+ state->symbols->push_scope();
+ foreach_iter(exec_list_iterator, iter, signature->parameters) {
+ ir_variable *const var = ((ir_instruction *) iter.get())->as_variable();
+
+ assert(var != NULL);
+
+ /* The only way a parameter would "exist" is if two parameters have
+ * the same name.
+ */
+ if (state->symbols->name_declared_this_scope(var->name)) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name);
+ } else {
+ state->symbols->add_variable(var);
+ }
+ }
+
+ /* Convert the body of the function to HIR. */
+ this->body->hir(&signature->body, state);
+ signature->is_defined = true;
+
+ state->symbols->pop_scope();
+
+ assert(state->current_function == signature);
+ state->current_function = NULL;
+
+ if (!signature->return_type->is_void() && !state->found_return) {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(& loc, state, "function `%s' has non-void return type "
+ "%s, but no return statement",
+ signature->function_name(),
+ signature->return_type->name);
+ }
+
+ /* Function definitions do not have r-values.
+ */
+ return NULL;
+}
+
+
+ir_rvalue *
+ast_jump_statement::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ void *ctx = state;
+
+ switch (mode) {
+ case ast_return: {
+ ir_return *inst;
+ assert(state->current_function);
+
+ if (opt_return_value) {
+ ir_rvalue *const ret = opt_return_value->hir(instructions, state);
+
+ /* The value of the return type can be NULL if the shader says
+ * 'return foo();' and foo() is a function that returns void.
+ *
+ * NOTE: The GLSL spec doesn't say that this is an error. The type
+ * of the return value is void. If the return type of the function is
+ * also void, then this should compile without error. Seriously.
+ */
+ const glsl_type *const ret_type =
+ (ret == NULL) ? glsl_type::void_type : ret->type;
+
+ /* Implicit conversions are not allowed for return values. */
+ if (state->current_function->return_type != ret_type) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "`return' with wrong type %s, in function `%s' "
+ "returning %s",
+ ret_type->name,
+ state->current_function->function_name(),
+ state->current_function->return_type->name);
+ }
+
+ inst = new(ctx) ir_return(ret);
+ } else {
+ if (state->current_function->return_type->base_type !=
+ GLSL_TYPE_VOID) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "`return' with no value, in function %s returning "
+ "non-void",
+ state->current_function->function_name());
+ }
+ inst = new(ctx) ir_return;
+ }
+
+ state->found_return = true;
+ instructions->push_tail(inst);
+ break;
+ }
+
+ case ast_discard:
+ if (state->target != fragment_shader) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "`discard' may only appear in a fragment shader");
+ }
+ instructions->push_tail(new(ctx) ir_discard);
+ break;
+
+ case ast_break:
+ case ast_continue:
+ /* FINISHME: Handle switch-statements. They cannot contain 'continue',
+ * FINISHME: and they use a different IR instruction for 'break'.
+ */
+ /* FINISHME: Correctly handle the nesting. If a switch-statement is
+ * FINISHME: inside a loop, a 'continue' is valid and will bind to the
+ * FINISHME: loop.
+ */
+ if (state->loop_or_switch_nesting == NULL) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "`%s' may only appear in a loop",
+ (mode == ast_break) ? "break" : "continue");
+ } else {
+ ir_loop *const loop = state->loop_or_switch_nesting->as_loop();
+
+ /* Inline the for loop expression again, since we don't know
+ * where near the end of the loop body the normal copy of it
+ * is going to be placed.
+ */
+ if (mode == ast_continue &&
+ state->loop_or_switch_nesting_ast->rest_expression) {
+ state->loop_or_switch_nesting_ast->rest_expression->hir(instructions,
+ state);
+ }
+
+ if (loop != NULL) {
+ ir_loop_jump *const jump =
+ new(ctx) ir_loop_jump((mode == ast_break)
+ ? ir_loop_jump::jump_break
+ : ir_loop_jump::jump_continue);
+ instructions->push_tail(jump);
+ }
+ }
+
+ break;
+ }
+
+ /* Jump instructions do not have r-values.
+ */
+ return NULL;
+}
+
+
+ir_rvalue *
+ast_selection_statement::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ void *ctx = state;
+
+ ir_rvalue *const condition = this->condition->hir(instructions, state);
+
+ /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
+ *
+ * "Any expression whose type evaluates to a Boolean can be used as the
+ * conditional expression bool-expression. Vector types are not accepted
+ * as the expression to if."
+ *
+ * The checks are separated so that higher quality diagnostics can be
+ * generated for cases where both rules are violated.
+ */
+ if (!condition->type->is_boolean() || !condition->type->is_scalar()) {
+ YYLTYPE loc = this->condition->get_location();
+
+ _mesa_glsl_error(& loc, state, "if-statement condition must be scalar "
+ "boolean");
+ }
+
+ ir_if *const stmt = new(ctx) ir_if(condition);
+
+ if (then_statement != NULL) {
+ state->symbols->push_scope();
+ then_statement->hir(& stmt->then_instructions, state);
+ state->symbols->pop_scope();
+ }
+
+ if (else_statement != NULL) {
+ state->symbols->push_scope();
+ else_statement->hir(& stmt->else_instructions, state);
+ state->symbols->pop_scope();
+ }
+
+ instructions->push_tail(stmt);
+
+ /* if-statements do not have r-values.
+ */
+ return NULL;
+}
+
+
+void
+ast_iteration_statement::condition_to_hir(ir_loop *stmt,
+ struct _mesa_glsl_parse_state *state)
+{
+ void *ctx = state;
+
+ if (condition != NULL) {
+ ir_rvalue *const cond =
+ condition->hir(& stmt->body_instructions, state);
+
+ if ((cond == NULL)
+ || !cond->type->is_boolean() || !cond->type->is_scalar()) {
+ YYLTYPE loc = condition->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "loop condition must be scalar boolean");
+ } else {
+ /* As the first code in the loop body, generate a block that looks
+ * like 'if (!condition) break;' as the loop termination condition.
+ */
+ ir_rvalue *const not_cond =
+ new(ctx) ir_expression(ir_unop_logic_not, glsl_type::bool_type, cond,
+ NULL);
+
+ ir_if *const if_stmt = new(ctx) ir_if(not_cond);
+
+ ir_jump *const break_stmt =
+ new(ctx) ir_loop_jump(ir_loop_jump::jump_break);
+
+ if_stmt->then_instructions.push_tail(break_stmt);
+ stmt->body_instructions.push_tail(if_stmt);
+ }
+ }
+}
+
+
+ir_rvalue *
+ast_iteration_statement::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ void *ctx = state;
+
+ /* For-loops and while-loops start a new scope, but do-while loops do not.
+ */
+ if (mode != ast_do_while)
+ state->symbols->push_scope();
+
+ if (init_statement != NULL)
+ init_statement->hir(instructions, state);
+
+ ir_loop *const stmt = new(ctx) ir_loop();
+ instructions->push_tail(stmt);
+
+ /* Track the current loop and / or switch-statement nesting.
+ */
+ ir_instruction *const nesting = state->loop_or_switch_nesting;
+ ast_iteration_statement *nesting_ast = state->loop_or_switch_nesting_ast;
+
+ state->loop_or_switch_nesting = stmt;
+ state->loop_or_switch_nesting_ast = this;
+
+ if (mode != ast_do_while)
+ condition_to_hir(stmt, state);
+
+ if (body != NULL)
+ body->hir(& stmt->body_instructions, state);
+
+ if (rest_expression != NULL)
+ rest_expression->hir(& stmt->body_instructions, state);
+
+ if (mode == ast_do_while)
+ condition_to_hir(stmt, state);
+
+ if (mode != ast_do_while)
+ state->symbols->pop_scope();
+
+ /* Restore previous nesting before returning.
+ */
+ state->loop_or_switch_nesting = nesting;
+ state->loop_or_switch_nesting_ast = nesting_ast;
+
+ /* Loops do not have r-values.
+ */
+ return NULL;
+}
+
+
+ir_rvalue *
+ast_type_specifier::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ if (!this->is_precision_statement && this->structure == NULL)
+ return NULL;
+
+ YYLTYPE loc = this->get_location();
+
+ if (this->precision != ast_precision_none
+ && state->language_version != 100
+ && state->language_version < 130) {
+ _mesa_glsl_error(&loc, state,
+ "precision qualifiers exist only in "
+ "GLSL ES 1.00, and GLSL 1.30 and later");
+ return NULL;
+ }
+ if (this->precision != ast_precision_none
+ && this->structure != NULL) {
+ _mesa_glsl_error(&loc, state,
+ "precision qualifiers do not apply to structures");
+ return NULL;
+ }
+
+ /* If this is a precision statement, check that the type to which it is
+ * applied is either float or int.
+ *
+ * From section 4.5.3 of the GLSL 1.30 spec:
+ * "The precision statement
+ * precision precision-qualifier type;
+ * can be used to establish a default precision qualifier. The type
+ * field can be either int or float [...]. Any other types or
+ * qualifiers will result in an error.
+ */
+ if (this->is_precision_statement) {
+ assert(this->precision != ast_precision_none);
+ assert(this->structure == NULL); /* The check for structures was
+ * performed above. */
+ if (this->is_array) {
+ _mesa_glsl_error(&loc, state,
+ "default precision statements do not apply to "
+ "arrays");
+ return NULL;
+ }
+ if (this->type_specifier != ast_float
+ && this->type_specifier != ast_int) {
+ _mesa_glsl_error(&loc, state,
+ "default precision statements apply only to types "
+ "float and int");
+ return NULL;
+ }
+
+ /* FINISHME: Translate precision statements into IR. */
+ return NULL;
+ }
+
+ if (this->structure != NULL)
+ return this->structure->hir(instructions, state);
+
+ return NULL;
+}
+
+
+ir_rvalue *
+ast_struct_specifier::hir(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ unsigned decl_count = 0;
+
+ /* Make an initial pass over the list of structure fields to determine how
+ * many there are. Each element in this list is an ast_declarator_list.
+ * This means that we actually need to count the number of elements in the
+ * 'declarations' list in each of the elements.
+ */
+ foreach_list_typed (ast_declarator_list, decl_list, link,
+ &this->declarations) {
+ foreach_list_const (decl_ptr, & decl_list->declarations) {
+ decl_count++;
+ }
+ }
+
+ /* Allocate storage for the structure fields and process the field
+ * declarations. As the declarations are processed, try to also convert
+ * the types to HIR. This ensures that structure definitions embedded in
+ * other structure definitions are processed.
+ */
+ glsl_struct_field *const fields = ralloc_array(state, glsl_struct_field,
+ decl_count);
+
+ unsigned i = 0;
+ foreach_list_typed (ast_declarator_list, decl_list, link,
+ &this->declarations) {
+ const char *type_name;
+
+ decl_list->type->specifier->hir(instructions, state);
+
+ /* Section 10.9 of the GLSL ES 1.00 specification states that
+ * embedded structure definitions have been removed from the language.
+ */
+ if (state->es_shader && decl_list->type->specifier->structure != NULL) {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(&loc, state, "Embedded structure definitions are "
+ "not allowed in GLSL ES 1.00.");
+ }
+
+ const glsl_type *decl_type =
+ decl_list->type->specifier->glsl_type(& type_name, state);
+
+ foreach_list_typed (ast_declaration, decl, link,
+ &decl_list->declarations) {
+ const struct glsl_type *field_type = decl_type;
+ if (decl->is_array) {
+ YYLTYPE loc = decl->get_location();
+ field_type = process_array_type(&loc, decl_type, decl->array_size,
+ state);
+ }
+ fields[i].type = (field_type != NULL)
+ ? field_type : glsl_type::error_type;
+ fields[i].name = decl->identifier;
+ i++;
+ }
+ }
+
+ assert(i == decl_count);
+
+ const glsl_type *t =
+ glsl_type::get_record_instance(fields, decl_count, this->name);
+
+ YYLTYPE loc = this->get_location();
+ if (!state->symbols->add_type(name, t)) {
+ _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name);
+ } else {
+ const glsl_type **s = reralloc(state, state->user_structures,
+ const glsl_type *,
+ state->num_user_structures + 1);
+ if (s != NULL) {
+ s[state->num_user_structures] = t;
+ state->user_structures = s;
+ state->num_user_structures++;
+ }
+ }
+
+ /* Structure type definitions do not have r-values.
+ */
+ return NULL;
+}