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+/*
+ * 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(instructions, state);
+
+ state->symbols->language_version = state->language_version;
+
+ state->current_function = NULL;
+
+ /* 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);
+}
+
+
+/**
+ * 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;
+}
+
+
+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)
+{
+ /* 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() || !type_b->is_integer()
+ || (type_a->base_type != type_b->base_type)) {
+ _mesa_glsl_error(loc, state, "type mismatch");
+ 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;
+}
+
+
+/**
+ * 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)
+{
+ const glsl_type *rhs_type = rhs->type;
+
+ /* 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.
+ *
+ * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
+ * is handled by ir_dereference::is_lvalue.
+ */
+ if (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)) {
+ rhs_type = rhs->type;
+ if (rhs_type == lhs_type)
+ return rhs;
+ }
+
+ return NULL;
+}
+
+ir_rvalue *
+do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
+ ir_rvalue *lhs, ir_rvalue *rhs,
+ YYLTYPE lhs_loc)
+{
+ void *ctx = state;
+ bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
+
+ if (!error_emitted) {
+ if (!lhs->is_lvalue()) {
+ _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
+ error_emitted = true;
+ }
+
+ if (state->es_shader && lhs->type->is_array()) {
+ _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
+ "allowed in GLSL ES 1.00.");
+ error_emitted = true;
+ }
+ }
+
+ ir_rvalue *new_rhs = validate_assignment(state, lhs->type, rhs);
+ 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;
+ }
+ }
+
+ /* 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 = talloc_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;
+}
+
+
+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 = glsl_type::error_type;
+ 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],
+ this->subexpressions[0]->get_location());
+ error_emitted = result->type->is_error();
+ type = result->type;
+ 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:
+ _mesa_glsl_error(& loc, state, "FINISHME: implement bit-shift operators");
+ error_emitted = true;
+ 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;
+ }
+
+ result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
+ op[0], op[1]);
+ type = glsl_type::bool_type;
+
+ 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);
+
+ 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, "LHS of `%s' must be an integer",
+ operator_string(this->oper));
+ error_emitted = true;
+ }
+
+ if (!op[1]->type->is_integer()) {
+ _mesa_glsl_error(&loc, state, "RHS of `%s' must be an integer",
+ operator_string(this->oper));
+ error_emitted = true;
+ }
+
+ if (op[0]->type->base_type != op[1]->type->base_type) {
+ _mesa_glsl_error(&loc, state, "operands of `%s' must have the same "
+ "base type", operator_string(this->oper));
+ error_emitted = true;
+ }
+
+ if (op[0]->type->is_vector() && op[1]->type->is_vector()
+ && op[0]->type->vector_elements != op[1]->type->vector_elements) {
+ _mesa_glsl_error(&loc, state, "operands of `%s' cannot be vectors of "
+ "different sizes", operator_string(this->oper));
+ error_emitted = true;
+ }
+
+ type = op[0]->type->is_scalar() ? op[1]->type : op[0]->type;
+ 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: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+
+ if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
+ YYLTYPE loc = this->subexpressions[0]->get_location();
+
+ _mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean",
+ operator_string(this->oper));
+ error_emitted = true;
+ }
+
+ ir_constant *op0_const = op[0]->constant_expression_value();
+ if (op0_const) {
+ if (op0_const->value.b[0]) {
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+ if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
+ YYLTYPE loc = this->subexpressions[1]->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "RHS of `%s' must be scalar boolean",
+ operator_string(this->oper));
+ error_emitted = true;
+ }
+ 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);
+
+ op[1] = this->subexpressions[1]->hir(&stmt->then_instructions, state);
+
+ if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
+ YYLTYPE loc = this->subexpressions[1]->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "RHS of `%s' must be scalar boolean",
+ operator_string(this->oper));
+ error_emitted = true;
+ }
+
+ 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: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+
+ if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
+ YYLTYPE loc = this->subexpressions[0]->get_location();
+
+ _mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean",
+ operator_string(this->oper));
+ error_emitted = true;
+ }
+
+ ir_constant *op0_const = op[0]->constant_expression_value();
+ if (op0_const) {
+ if (op0_const->value.b[0]) {
+ result = op0_const;
+ } else {
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+ if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
+ YYLTYPE loc = this->subexpressions[1]->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "RHS of `%s' must be scalar boolean",
+ operator_string(this->oper));
+ error_emitted = true;
+ }
+ 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);
+
+ op[1] = this->subexpressions[1]->hir(&stmt->else_instructions, state);
+
+ if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
+ YYLTYPE loc = this->subexpressions[1]->get_location();
+
+ _mesa_glsl_error(& loc, state, "RHS of `%s' must be scalar boolean",
+ operator_string(this->oper));
+ error_emitted = true;
+ }
+
+ 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);
+
+ 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:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+ op[1] = this->subexpressions[1]->hir(instructions, state);
+
+
+ result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
+ op[0], op[1]);
+ type = glsl_type::bool_type;
+ break;
+
+ case ast_logic_not:
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+
+ if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
+ YYLTYPE loc = this->subexpressions[0]->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "operand of `!' must be scalar boolean");
+ error_emitted = true;
+ }
+
+ result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
+ op[0], NULL);
+ type = glsl_type::bool_type;
+ 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,
+ this->subexpressions[0]->get_location());
+ type = result->type;
+ 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,
+ this->subexpressions[0]->get_location());
+ type = result->type;
+ error_emitted = type->is_error();
+ break;
+ }
+
+ case ast_ls_assign:
+ case ast_rs_assign:
+ _mesa_glsl_error(& loc, state,
+ "FINISHME: implement bit-shift assignment operators");
+ error_emitted = true;
+ break;
+
+ case ast_and_assign:
+ case ast_xor_assign:
+ case ast_or_assign:
+ _mesa_glsl_error(& loc, state,
+ "FINISHME: implement logic assignment operators");
+ error_emitted = true;
+ break;
+
+ case ast_conditional: {
+ op[0] = this->subexpressions[0]->hir(instructions, state);
+
+ /* 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."
+ */
+ if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
+ YYLTYPE loc = this->subexpressions[0]->get_location();
+
+ _mesa_glsl_error(& loc, state, "?: condition must be scalar boolean");
+ error_emitted = true;
+ }
+
+ /* 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,
+ this->subexpressions[0]->get_location());
+ type = result->type;
+ 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,
+ this->subexpressions[0]->get_location());
+
+ type = result->type;
+ error_emitted = op[0]->type->is_error();
+ break;
+ }
+
+ case ast_field_selection:
+ result = _mesa_ast_field_selection_to_hir(this, instructions, state);
+ type = result->type;
+ 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;
+ }
+ } 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();
+ }
+ }
+
+ if (error_emitted)
+ result->type = glsl_type::error_type;
+
+ type = result->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) {
+ type = result->type;
+ } else {
+ _mesa_glsl_error(& loc, state, "`%s' undeclared",
+ this->primary_expression.identifier);
+
+ error_emitted = true;
+ }
+ break;
+ }
+
+ case ast_int_constant:
+ type = glsl_type::int_type;
+ result = new(ctx) ir_constant(this->primary_expression.int_constant);
+ break;
+
+ case ast_uint_constant:
+ type = glsl_type::uint_type;
+ result = new(ctx) ir_constant(this->primary_expression.uint_constant);
+ break;
+
+ case ast_float_constant:
+ type = glsl_type::float_type;
+ result = new(ctx) ir_constant(this->primary_expression.float_constant);
+ break;
+
+ case ast_bool_constant:
+ type = glsl_type::bool_type;
+ 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.
+ */
+ foreach_list_typed (ast_node, ast, link, &this->expressions)
+ result = ast->hir(instructions, state);
+
+ type = result->type;
+
+ /* Any errors should have already been emitted in the loop above.
+ */
+ error_emitted = true;
+ break;
+ }
+ }
+
+ if (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();
+
+ /* FINISHME: Verify that the grammar forbids side-effects in array
+ * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
+ */
+ assert(dummy_instructions.is_empty());
+
+ 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];
+ }
+ }
+ }
+ } 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->invariant)
+ var->invariant = 1;
+
+ /* FINISHME: Mark 'in' variables at global scope as read-only. */
+ if (qual->constant || qual->attribute || qual->uniform
+ || (qual->varying && (state->target == fragment_shader)))
+ var->read_only = 1;
+
+ if (qual->centroid)
+ var->centroid = 1;
+
+ if (qual->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->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->in && qual->out)
+ var->mode = ir_var_inout;
+ else if (qual->attribute || qual->in
+ || (qual->varying && (state->target == fragment_shader)))
+ var->mode = ir_var_in;
+ else if (qual->out || (qual->varying && (state->target == vertex_shader)))
+ var->mode = ir_var_out;
+ else if (qual->uniform)
+ var->mode = ir_var_uniform;
+
+ if (qual->flat)
+ var->interpolation = ir_var_flat;
+ else if (qual->noperspective)
+ var->interpolation = ir_var_noperspective;
+ else
+ var->interpolation = ir_var_smooth;
+
+ var->pixel_center_integer = qual->pixel_center_integer;
+ var->origin_upper_left = qual->origin_upper_left;
+ if ((qual->origin_upper_left || qual->pixel_center_integer)
+ && (strcmp(var->name, "gl_FragCoord") != 0)) {
+ const char *const qual_string = (qual->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 (var->type->is_array() && state->language_version != 110) {
+ var->array_lvalue = true;
+ }
+}
+
+
+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 {
+ 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()) {
+ /* The only valid case where the declaration list can be empty is when
+ * the declaration is setting the default precision of a built-in type
+ * (e.g., 'precision highp vec4;').
+ */
+
+ if (decl_type != NULL) {
+ } 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.
+ */
+ if (state->language_version < 120) {
+ if (this->type->qualifier.out) {
+ _mesa_glsl_error(& loc, state,
+ "`out' qualifier in declaration of `%s' "
+ "only valid for function parameters in GLSL 1.10.",
+ decl->identifier);
+ }
+ if (this->type->qualifier.in) {
+ _mesa_glsl_error(& loc, state,
+ "`in' qualifier in declaration of `%s' "
+ "only valid for function parameters in GLSL 1.10.",
+ decl->identifier);
+ }
+ /* FINISHME: Test for other invalid qualifiers. */
+ }
+
+ apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
+ & loc);
+
+ if (this->type->qualifier.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.attribute) {
+ mode = "attribute";
+ } else if (this->type->qualifier.uniform) {
+ mode = "uniform";
+ } else if (this->type->qualifier.varying) {
+ mode = "varying";
+ } else if (this->type->qualifier.in) {
+ mode = "in";
+ extra = " or in function parameter list";
+ } else if (this->type->qualifier.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) {
+ 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;
+ }
+ }
+ }
+
+ /* 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;
+ if (decl->initializer != 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(ctx) 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 (this->type->qualifier.constant || this->type->qualifier.uniform) {
+ ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs);
+ 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",
+ (this->type->qualifier.constant)
+ ? "const" : "uniform",
+ decl->identifier);
+ if (var->type->is_numeric()) {
+ /* Reduce cascading errors. */
+ var->constant_value = ir_constant::zero(ctx, 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(ctx, var->type);
+ }
+ }
+ }
+
+ if (rhs && !rhs->type->is_error()) {
+ bool temp = var->read_only;
+ if (this->type->qualifier.constant)
+ var->read_only = false;
+
+ /* Never emit code to initialize a uniform.
+ */
+ if (!this->type->qualifier.uniform)
+ result = do_assignment(&initializer_instructions, state,
+ lhs, rhs,
+ this->get_location());
+ var->read_only = temp;
+ }
+ }
+
+ /* 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.constant && decl->initializer == NULL) {
+ _mesa_glsl_error(& loc, state,
+ "const declaration of `%s' must be initialized");
+ }
+
+ /* 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))) {
+
+ /* 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.
+ */
+
+ /* 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."
+ */
+ const unsigned size = unsigned(var->type->array_size());
+ if ((strcmp("gl_TexCoord", var->name) == 0)
+ && (size > state->Const.MaxTextureCoords)) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state, "`gl_TexCoord' array size cannot "
+ "be larger than gl_MaxTextureCoords (%u)\n",
+ state->Const.MaxTextureCoords);
+ } else if ((size > 0) && (size <= earlier->max_array_access)) {
+ YYLTYPE loc = this->get_location();
+
+ _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->extensions->ARB_fragment_coord_conventions
+ && 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;
+ } else {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier);
+ }
+
+ continue;
+ }
+
+ /* By now, we know it's a new variable declaration (we didn't hit the
+ * above "continue").
+ *
+ * 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->name, 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);
+
+ 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");
+ }
+}
+
+
+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;
+
+ /* 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);
+ }
+
+ /* 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->name, 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 the new function header */
+ if (state->current_function == NULL)
+ instructions->push_tail(f);
+ else {
+ /* IR invariants disallow function declarations or definitions nested
+ * within other function definitions. Insert the new ir_function
+ * block in the instruction sequence before the ir_function block
+ * containing the current ir_function_signature.
+ *
+ * This can only happen in a GLSL 1.10 shader. In all other GLSL
+ * versions this nesting is disallowed. There is a check for this at
+ * the top of this function.
+ */
+ ir_function *const curr =
+ const_cast<ir_function *>(state->current_function->function());
+
+ curr->insert_before(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->name, 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) {
+ if (state->current_function->return_type->base_type ==
+ GLSL_TYPE_VOID) {
+ YYLTYPE loc = this->get_location();
+
+ _mesa_glsl_error(& loc, state,
+ "`return` with a value, in function `%s' "
+ "returning void",
+ state->current_function->function_name());
+ }
+
+ ir_expression *const ret = (ir_expression *)
+ opt_return_value->hir(instructions, state);
+ assert(ret != NULL);
+
+ /* 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->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 = talloc_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 = (const glsl_type **)
+ realloc(state->user_structures,
+ sizeof(state->user_structures[0]) *
+ (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;
+}