aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/glsl/ir.h
diff options
context:
space:
mode:
Diffstat (limited to 'mesalib/src/glsl/ir.h')
-rw-r--r--mesalib/src/glsl/ir.h3117
1 files changed, 1606 insertions, 1511 deletions
diff --git a/mesalib/src/glsl/ir.h b/mesalib/src/glsl/ir.h
index fa246b5e5..b143827a7 100644
--- a/mesalib/src/glsl/ir.h
+++ b/mesalib/src/glsl/ir.h
@@ -1,1511 +1,1606 @@
-/* -*- c++ -*- */
-/*
- * 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.
- */
-
-#pragma once
-#ifndef IR_H
-#define IR_H
-
-#include <cstdio>
-#include <cstdlib>
-
-extern "C" {
-#include <talloc.h>
-}
-
-#include "list.h"
-#include "ir_visitor.h"
-#include "ir_hierarchical_visitor.h"
-
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
-#endif
-
-/**
- * \defgroup IR Intermediate representation nodes
- *
- * @{
- */
-
-/**
- * Class tags
- *
- * Each concrete class derived from \c ir_instruction has a value in this
- * enumerant. The value for the type is stored in \c ir_instruction::ir_type
- * by the constructor. While using type tags is not very C++, it is extremely
- * convenient. For example, during debugging you can simply inspect
- * \c ir_instruction::ir_type to find out the actual type of the object.
- *
- * In addition, it is possible to use a switch-statement based on \c
- * \c ir_instruction::ir_type to select different behavior for different object
- * types. For functions that have only slight differences for several object
- * types, this allows writing very straightforward, readable code.
- */
-enum ir_node_type {
- /**
- * Zero is unused so that the IR validator can detect cases where
- * \c ir_instruction::ir_type has not been initialized.
- */
- ir_type_unset,
- ir_type_variable,
- ir_type_assignment,
- ir_type_call,
- ir_type_constant,
- ir_type_dereference_array,
- ir_type_dereference_record,
- ir_type_dereference_variable,
- ir_type_discard,
- ir_type_expression,
- ir_type_function,
- ir_type_function_signature,
- ir_type_if,
- ir_type_loop,
- ir_type_loop_jump,
- ir_type_return,
- ir_type_swizzle,
- ir_type_texture,
- ir_type_max /**< maximum ir_type enum number, for validation */
-};
-
-/**
- * Base class of all IR instructions
- */
-class ir_instruction : public exec_node {
-public:
- enum ir_node_type ir_type;
- const struct glsl_type *type;
-
- /** ir_print_visitor helper for debugging. */
- void print(void) const;
-
- virtual void accept(ir_visitor *) = 0;
- virtual ir_visitor_status accept(ir_hierarchical_visitor *) = 0;
- virtual ir_instruction *clone(void *mem_ctx,
- struct hash_table *ht) const = 0;
-
- /**
- * \name IR instruction downcast functions
- *
- * These functions either cast the object to a derived class or return
- * \c NULL if the object's type does not match the specified derived class.
- * Additional downcast functions will be added as needed.
- */
- /*@{*/
- virtual class ir_variable * as_variable() { return NULL; }
- virtual class ir_function * as_function() { return NULL; }
- virtual class ir_dereference * as_dereference() { return NULL; }
- virtual class ir_dereference_array * as_dereference_array() { return NULL; }
- virtual class ir_dereference_variable *as_dereference_variable() { return NULL; }
- virtual class ir_expression * as_expression() { return NULL; }
- virtual class ir_rvalue * as_rvalue() { return NULL; }
- virtual class ir_loop * as_loop() { return NULL; }
- virtual class ir_assignment * as_assignment() { return NULL; }
- virtual class ir_call * as_call() { return NULL; }
- virtual class ir_return * as_return() { return NULL; }
- virtual class ir_if * as_if() { return NULL; }
- virtual class ir_swizzle * as_swizzle() { return NULL; }
- virtual class ir_constant * as_constant() { return NULL; }
- /*@}*/
-
-protected:
- ir_instruction()
- {
- ir_type = ir_type_unset;
- type = NULL;
- }
-};
-
-
-class ir_rvalue : public ir_instruction {
-public:
- virtual ir_rvalue *clone(void *mem_ctx, struct hash_table *) const = 0;
-
- virtual ir_constant *constant_expression_value() = 0;
-
- virtual ir_rvalue * as_rvalue()
- {
- return this;
- }
-
- virtual bool is_lvalue()
- {
- return false;
- }
-
- /**
- * Get the variable that is ultimately referenced by an r-value
- */
- virtual ir_variable *variable_referenced()
- {
- return NULL;
- }
-
-
- /**
- * If an r-value is a reference to a whole variable, get that variable
- *
- * \return
- * Pointer to a variable that is completely dereferenced by the r-value. If
- * the r-value is not a dereference or the dereference does not access the
- * entire variable (i.e., it's just one array element, struct field), \c NULL
- * is returned.
- */
- virtual ir_variable *whole_variable_referenced()
- {
- return NULL;
- }
-
-protected:
- ir_rvalue();
-};
-
-
-/**
- * Variable storage classes
- */
-enum ir_variable_mode {
- ir_var_auto = 0, /**< Function local variables and globals. */
- ir_var_uniform, /**< Variable declared as a uniform. */
- ir_var_in,
- ir_var_out,
- ir_var_inout,
- ir_var_temporary /**< Temporary variable generated during compilation. */
-};
-
-enum ir_variable_interpolation {
- ir_var_smooth = 0,
- ir_var_flat,
- ir_var_noperspective
-};
-
-
-class ir_variable : public ir_instruction {
-public:
- ir_variable(const struct glsl_type *, const char *, ir_variable_mode);
-
- virtual ir_variable *clone(void *mem_ctx, struct hash_table *ht) const;
-
- virtual ir_variable *as_variable()
- {
- return this;
- }
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
-
- /**
- * Get the string value for the interpolation qualifier
- *
- * \return The string that would be used in a shader to specify \c
- * mode will be returned.
- *
- * This function should only be used on a shader input or output variable.
- */
- const char *interpolation_string() const;
-
- /**
- * Calculate the number of slots required to hold this variable
- *
- * This is used to determine how many uniform or varying locations a variable
- * occupies. The count is in units of floating point components.
- */
- unsigned component_slots() const;
-
- /**
- * Delcared name of the variable
- */
- const char *name;
-
- /**
- * Highest element accessed with a constant expression array index
- *
- * Not used for non-array variables.
- */
- unsigned max_array_access;
-
- /**
- * Is the variable read-only?
- *
- * This is set for variables declared as \c const, shader inputs,
- * and uniforms.
- */
- unsigned read_only:1;
- unsigned centroid:1;
- unsigned invariant:1;
-
- /**
- * Storage class of the variable.
- *
- * \sa ir_variable_mode
- */
- unsigned mode:3;
-
- /**
- * Interpolation mode for shader inputs / outputs
- *
- * \sa ir_variable_interpolation
- */
- unsigned interpolation:2;
-
- /**
- * Flag that the whole array is assignable
- *
- * In GLSL 1.20 and later whole arrays are assignable (and comparable for
- * equality). This flag enables this behavior.
- */
- unsigned array_lvalue:1;
-
- /**
- * \name ARB_fragment_coord_conventions
- * @{
- */
- unsigned origin_upper_left:1;
- unsigned pixel_center_integer:1;
- /*@}*/
-
- /**
- * Storage location of the base of this variable
- *
- * The precise meaning of this field depends on the nature of the variable.
- *
- * - Vertex shader input: one of the values from \c gl_vert_attrib.
- * - Vertex shader output: one of the values from \c gl_vert_result.
- * - Fragment shader input: one of the values from \c gl_frag_attrib.
- * - Fragment shader output: one of the values from \c gl_frag_result.
- * - Uniforms: Per-stage uniform slot number.
- * - Other: This field is not currently used.
- *
- * If the variable is a uniform, shader input, or shader output, and the
- * slot has not been assigned, the value will be -1.
- */
- int location;
-
- /**
- * Emit a warning if this variable is accessed.
- */
- const char *warn_extension;
-
- /**
- * Value assigned in the initializer of a variable declared "const"
- */
- ir_constant *constant_value;
-};
-
-
-/*@{*/
-/**
- * The representation of a function instance; may be the full definition or
- * simply a prototype.
- */
-class ir_function_signature : public ir_instruction {
- /* An ir_function_signature will be part of the list of signatures in
- * an ir_function.
- */
-public:
- ir_function_signature(const glsl_type *return_type);
-
- virtual ir_function_signature *clone(void *mem_ctx,
- struct hash_table *ht) const;
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- /**
- * Get the name of the function for which this is a signature
- */
- const char *function_name() const;
-
- /**
- * Get a handle to the function for which this is a signature
- *
- * There is no setter function, this function returns a \c const pointer,
- * and \c ir_function_signature::_function is private for a reason. The
- * only way to make a connection between a function and function signature
- * is via \c ir_function::add_signature. This helps ensure that certain
- * invariants (i.e., a function signature is in the list of signatures for
- * its \c _function) are met.
- *
- * \sa ir_function::add_signature
- */
- inline const class ir_function *function() const
- {
- return this->_function;
- }
-
- /**
- * Check whether the qualifiers match between this signature's parameters
- * and the supplied parameter list. If not, returns the name of the first
- * parameter with mismatched qualifiers (for use in error messages).
- */
- const char *qualifiers_match(exec_list *params);
-
- /**
- * Replace the current parameter list with the given one. This is useful
- * if the current information came from a prototype, and either has invalid
- * or missing parameter names.
- */
- void replace_parameters(exec_list *new_params);
-
- /**
- * Function return type.
- *
- * \note This discards the optional precision qualifier.
- */
- const struct glsl_type *return_type;
-
- /**
- * List of ir_variable of function parameters.
- *
- * This represents the storage. The paramaters passed in a particular
- * call will be in ir_call::actual_paramaters.
- */
- struct exec_list parameters;
-
- /** Whether or not this function has a body (which may be empty). */
- unsigned is_defined:1;
-
- /** Whether or not this function signature is a built-in. */
- unsigned is_builtin:1;
-
- /** Body of instructions in the function. */
- struct exec_list body;
-
-private:
- /** Function of which this signature is one overload. */
- class ir_function *_function;
-
- friend class ir_function;
-};
-
-
-/**
- * Header for tracking multiple overloaded functions with the same name.
- * Contains a list of ir_function_signatures representing each of the
- * actual functions.
- */
-class ir_function : public ir_instruction {
-public:
- ir_function(const char *name);
-
- virtual ir_function *clone(void *mem_ctx, struct hash_table *ht) const;
-
- virtual ir_function *as_function()
- {
- return this;
- }
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- void add_signature(ir_function_signature *sig)
- {
- sig->_function = this;
- this->signatures.push_tail(sig);
- }
-
- /**
- * Get an iterator for the set of function signatures
- */
- exec_list_iterator iterator()
- {
- return signatures.iterator();
- }
-
- /**
- * Find a signature that matches a set of actual parameters, taking implicit
- * conversions into account.
- */
- ir_function_signature *matching_signature(const exec_list *actual_param);
-
- /**
- * Find a signature that exactly matches a set of actual parameters without
- * any implicit type conversions.
- */
- ir_function_signature *exact_matching_signature(const exec_list *actual_ps);
-
- /**
- * Name of the function.
- */
- const char *name;
-
- /** Whether or not this function has a signature that isn't a built-in. */
- bool has_user_signature();
-
- /**
- * List of ir_function_signature for each overloaded function with this name.
- */
- struct exec_list signatures;
-};
-
-inline const char *ir_function_signature::function_name() const
-{
- return this->_function->name;
-}
-/*@}*/
-
-
-/**
- * IR instruction representing high-level if-statements
- */
-class ir_if : public ir_instruction {
-public:
- ir_if(ir_rvalue *condition)
- : condition(condition)
- {
- ir_type = ir_type_if;
- }
-
- virtual ir_if *clone(void *mem_ctx, struct hash_table *ht) const;
-
- virtual ir_if *as_if()
- {
- return this;
- }
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- ir_rvalue *condition;
- /** List of ir_instruction for the body of the then branch */
- exec_list then_instructions;
- /** List of ir_instruction for the body of the else branch */
- exec_list else_instructions;
-};
-
-
-/**
- * IR instruction representing a high-level loop structure.
- */
-class ir_loop : public ir_instruction {
-public:
- ir_loop();
-
- virtual ir_loop *clone(void *mem_ctx, struct hash_table *ht) const;
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- virtual ir_loop *as_loop()
- {
- return this;
- }
-
- /**
- * Get an iterator for the instructions of the loop body
- */
- exec_list_iterator iterator()
- {
- return body_instructions.iterator();
- }
-
- /** List of ir_instruction that make up the body of the loop. */
- exec_list body_instructions;
-
- /**
- * \name Loop counter and controls
- *
- * Represents a loop like a FORTRAN \c do-loop.
- *
- * \note
- * If \c from and \c to are the same value, the loop will execute once.
- */
- /*@{*/
- ir_rvalue *from; /** Value of the loop counter on the first
- * iteration of the loop.
- */
- ir_rvalue *to; /** Value of the loop counter on the last
- * iteration of the loop.
- */
- ir_rvalue *increment;
- ir_variable *counter;
-
- /**
- * Comparison operation in the loop terminator.
- *
- * If any of the loop control fields are non-\c NULL, this field must be
- * one of \c ir_binop_less, \c ir_binop_greater, \c ir_binop_lequal,
- * \c ir_binop_gequal, \c ir_binop_equal, or \c ir_binop_nequal.
- */
- int cmp;
- /*@}*/
-};
-
-
-class ir_assignment : public ir_instruction {
-public:
- ir_assignment(ir_rvalue *lhs, ir_rvalue *rhs, ir_rvalue *condition);
-
- /**
- * Construct an assignment with an explicit write mask
- *
- * \note
- * Since a write mask is supplied, the LHS must already be a bare
- * \c ir_dereference. The cannot be any swizzles in the LHS.
- */
- ir_assignment(ir_dereference *lhs, ir_rvalue *rhs, ir_rvalue *condition,
- unsigned write_mask);
-
- virtual ir_assignment *clone(void *mem_ctx, struct hash_table *ht) const;
-
- virtual ir_constant *constant_expression_value();
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- virtual ir_assignment * as_assignment()
- {
- return this;
- }
-
- /**
- * Get a whole variable written by an assignment
- *
- * If the LHS of the assignment writes a whole variable, the variable is
- * returned. Otherwise \c NULL is returned. Examples of whole-variable
- * assignment are:
- *
- * - Assigning to a scalar
- * - Assigning to all components of a vector
- * - Whole array (or matrix) assignment
- * - Whole structure assignment
- */
- ir_variable *whole_variable_written();
-
- /**
- * Set the LHS of an assignment
- */
- void set_lhs(ir_rvalue *lhs);
-
- /**
- * Left-hand side of the assignment.
- *
- * This should be treated as read only. If you need to set the LHS of an
- * assignment, use \c ir_assignment::set_lhs.
- */
- ir_dereference *lhs;
-
- /**
- * Value being assigned
- */
- ir_rvalue *rhs;
-
- /**
- * Optional condition for the assignment.
- */
- ir_rvalue *condition;
-
-
- /**
- * Component mask written
- *
- * For non-vector types in the LHS, this field will be zero. For vector
- * types, a bit will be set for each component that is written. Note that
- * for \c vec2 and \c vec3 types only the lower bits will ever be set.
- *
- * A partially-set write mask means that each enabled channel gets
- * the value from a consecutive channel of the rhs. For example,
- * to write just .xyw of gl_FrontColor with color:
- *
- * (assign (constant bool (1)) (xyw)
- * (var_ref gl_FragColor)
- * (swiz xyw (var_ref color)))
- */
- unsigned write_mask:4;
-};
-
-/* Update ir_expression::num_operands() and operator_strs when
- * updating this list.
- */
-enum ir_expression_operation {
- ir_unop_bit_not,
- ir_unop_logic_not,
- ir_unop_neg,
- ir_unop_abs,
- ir_unop_sign,
- ir_unop_rcp,
- ir_unop_rsq,
- ir_unop_sqrt,
- ir_unop_exp, /**< Log base e on gentype */
- ir_unop_log, /**< Natural log on gentype */
- ir_unop_exp2,
- ir_unop_log2,
- ir_unop_f2i, /**< Float-to-integer conversion. */
- ir_unop_i2f, /**< Integer-to-float conversion. */
- ir_unop_f2b, /**< Float-to-boolean conversion */
- ir_unop_b2f, /**< Boolean-to-float conversion */
- ir_unop_i2b, /**< int-to-boolean conversion */
- ir_unop_b2i, /**< Boolean-to-int conversion */
- ir_unop_u2f, /**< Unsigned-to-float conversion. */
- ir_unop_any,
-
- /**
- * \name Unary floating-point rounding operations.
- */
- /*@{*/
- ir_unop_trunc,
- ir_unop_ceil,
- ir_unop_floor,
- ir_unop_fract,
- /*@}*/
-
- /**
- * \name Trigonometric operations.
- */
- /*@{*/
- ir_unop_sin,
- ir_unop_cos,
- /*@}*/
-
- /**
- * \name Partial derivatives.
- */
- /*@{*/
- ir_unop_dFdx,
- ir_unop_dFdy,
- /*@}*/
-
- ir_unop_noise,
-
- ir_binop_add,
- ir_binop_sub,
- ir_binop_mul,
- ir_binop_div,
-
- /**
- * Takes one of two combinations of arguments:
- *
- * - mod(vecN, vecN)
- * - mod(vecN, float)
- *
- * Does not take integer types.
- */
- ir_binop_mod,
-
- /**
- * \name Binary comparison operators which return a boolean vector.
- * The type of both operands must be equal.
- */
- /*@{*/
- ir_binop_less,
- ir_binop_greater,
- ir_binop_lequal,
- ir_binop_gequal,
- ir_binop_equal,
- ir_binop_nequal,
- /**
- * Returns single boolean for whether all components of operands[0]
- * equal the components of operands[1].
- */
- ir_binop_all_equal,
- /**
- * Returns single boolean for whether any component of operands[0]
- * is not equal to the corresponding component of operands[1].
- */
- ir_binop_any_nequal,
- /*@}*/
-
- /**
- * \name Bit-wise binary operations.
- */
- /*@{*/
- ir_binop_lshift,
- ir_binop_rshift,
- ir_binop_bit_and,
- ir_binop_bit_xor,
- ir_binop_bit_or,
- /*@}*/
-
- ir_binop_logic_and,
- ir_binop_logic_xor,
- ir_binop_logic_or,
-
- ir_binop_dot,
- ir_binop_cross,
- ir_binop_min,
- ir_binop_max,
-
- ir_binop_pow
-};
-
-class ir_expression : public ir_rvalue {
-public:
- ir_expression(int op, const struct glsl_type *type,
- ir_rvalue *, ir_rvalue *);
-
- virtual ir_expression *as_expression()
- {
- return this;
- }
-
- virtual ir_expression *clone(void *mem_ctx, struct hash_table *ht) const;
-
- /**
- * Attempt to constant-fold the expression
- *
- * If the expression cannot be constant folded, this method will return
- * \c NULL.
- */
- virtual ir_constant *constant_expression_value();
-
- /**
- * Determine the number of operands used by an expression
- */
- static unsigned int get_num_operands(ir_expression_operation);
-
- /**
- * Determine the number of operands used by an expression
- */
- unsigned int get_num_operands() const
- {
- return get_num_operands(operation);
- }
-
- /**
- * Return a string representing this expression's operator.
- */
- const char *operator_string();
-
- /**
- * Return a string representing this expression's operator.
- */
- static const char *operator_string(ir_expression_operation);
-
-
- /**
- * Do a reverse-lookup to translate the given string into an operator.
- */
- static ir_expression_operation get_operator(const char *);
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- ir_expression_operation operation;
- ir_rvalue *operands[2];
-};
-
-
-/**
- * IR instruction representing a function call
- */
-class ir_call : public ir_rvalue {
-public:
- ir_call(ir_function_signature *callee, exec_list *actual_parameters)
- : callee(callee)
- {
- ir_type = ir_type_call;
- assert(callee->return_type != NULL);
- type = callee->return_type;
- actual_parameters->move_nodes_to(& this->actual_parameters);
- }
-
- virtual ir_call *clone(void *mem_ctx, struct hash_table *ht) const;
-
- virtual ir_constant *constant_expression_value();
-
- virtual ir_call *as_call()
- {
- return this;
- }
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- /**
- * Get a generic ir_call object when an error occurs
- *
- * Any allocation will be performed with 'ctx' as talloc owner.
- */
- static ir_call *get_error_instruction(void *ctx);
-
- /**
- * Get an iterator for the set of acutal parameters
- */
- exec_list_iterator iterator()
- {
- return actual_parameters.iterator();
- }
-
- /**
- * Get the name of the function being called.
- */
- const char *callee_name() const
- {
- return callee->function_name();
- }
-
- /**
- * Get the function signature bound to this function call
- */
- ir_function_signature *get_callee()
- {
- return callee;
- }
-
- /**
- * Set the function call target
- */
- void set_callee(ir_function_signature *sig);
-
- /**
- * Generates an inline version of the function before @ir,
- * returning the return value of the function.
- */
- ir_rvalue *generate_inline(ir_instruction *ir);
-
- /* List of ir_rvalue of paramaters passed in this call. */
- exec_list actual_parameters;
-
-private:
- ir_call()
- : callee(NULL)
- {
- this->ir_type = ir_type_call;
- }
-
- ir_function_signature *callee;
-};
-
-
-/**
- * \name Jump-like IR instructions.
- *
- * These include \c break, \c continue, \c return, and \c discard.
- */
-/*@{*/
-class ir_jump : public ir_instruction {
-protected:
- ir_jump()
- {
- ir_type = ir_type_unset;
- }
-};
-
-class ir_return : public ir_jump {
-public:
- ir_return()
- : value(NULL)
- {
- this->ir_type = ir_type_return;
- }
-
- ir_return(ir_rvalue *value)
- : value(value)
- {
- this->ir_type = ir_type_return;
- }
-
- virtual ir_return *clone(void *mem_ctx, struct hash_table *) const;
-
- virtual ir_return *as_return()
- {
- return this;
- }
-
- ir_rvalue *get_value() const
- {
- return value;
- }
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- ir_rvalue *value;
-};
-
-
-/**
- * Jump instructions used inside loops
- *
- * These include \c break and \c continue. The \c break within a loop is
- * different from the \c break within a switch-statement.
- *
- * \sa ir_switch_jump
- */
-class ir_loop_jump : public ir_jump {
-public:
- enum jump_mode {
- jump_break,
- jump_continue
- };
-
- ir_loop_jump(jump_mode mode)
- {
- this->ir_type = ir_type_loop_jump;
- this->mode = mode;
- this->loop = loop;
- }
-
- virtual ir_loop_jump *clone(void *mem_ctx, struct hash_table *) const;
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- bool is_break() const
- {
- return mode == jump_break;
- }
-
- bool is_continue() const
- {
- return mode == jump_continue;
- }
-
- /** Mode selector for the jump instruction. */
- enum jump_mode mode;
-private:
- /** Loop containing this break instruction. */
- ir_loop *loop;
-};
-
-/**
- * IR instruction representing discard statements.
- */
-class ir_discard : public ir_jump {
-public:
- ir_discard()
- {
- this->ir_type = ir_type_discard;
- this->condition = NULL;
- }
-
- ir_discard(ir_rvalue *cond)
- {
- this->ir_type = ir_type_discard;
- this->condition = cond;
- }
-
- virtual ir_discard *clone(void *mem_ctx, struct hash_table *ht) const;
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- ir_rvalue *condition;
-};
-/*@}*/
-
-
-/**
- * Texture sampling opcodes used in ir_texture
- */
-enum ir_texture_opcode {
- ir_tex, /**< Regular texture look-up */
- ir_txb, /**< Texture look-up with LOD bias */
- ir_txl, /**< Texture look-up with explicit LOD */
- ir_txd, /**< Texture look-up with partial derivatvies */
- ir_txf /**< Texel fetch with explicit LOD */
-};
-
-
-/**
- * IR instruction to sample a texture
- *
- * The specific form of the IR instruction depends on the \c mode value
- * selected from \c ir_texture_opcodes. In the printed IR, these will
- * appear as:
- *
- * Texel offset
- * | Projection divisor
- * | | Shadow comparitor
- * | | |
- * v v v
- * (tex (sampler) (coordinate) (0 0 0) (1) ( ))
- * (txb (sampler) (coordinate) (0 0 0) (1) ( ) (bias))
- * (txl (sampler) (coordinate) (0 0 0) (1) ( ) (lod))
- * (txd (sampler) (coordinate) (0 0 0) (1) ( ) (dPdx dPdy))
- * (txf (sampler) (coordinate) (0 0 0) (lod))
- */
-class ir_texture : public ir_rvalue {
-public:
- ir_texture(enum ir_texture_opcode op)
- : op(op), projector(NULL), shadow_comparitor(NULL)
- {
- this->ir_type = ir_type_texture;
- }
-
- virtual ir_texture *clone(void *mem_ctx, struct hash_table *) const;
-
- virtual ir_constant *constant_expression_value();
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- /**
- * Return a string representing the ir_texture_opcode.
- */
- const char *opcode_string();
-
- /** Set the sampler and infer the type. */
- void set_sampler(ir_dereference *sampler);
-
- /**
- * Do a reverse-lookup to translate a string into an ir_texture_opcode.
- */
- static ir_texture_opcode get_opcode(const char *);
-
- enum ir_texture_opcode op;
-
- /** Sampler to use for the texture access. */
- ir_dereference *sampler;
-
- /** Texture coordinate to sample */
- ir_rvalue *coordinate;
-
- /**
- * Value used for projective divide.
- *
- * If there is no projective divide (the common case), this will be
- * \c NULL. Optimization passes should check for this to point to a constant
- * of 1.0 and replace that with \c NULL.
- */
- ir_rvalue *projector;
-
- /**
- * Coordinate used for comparison on shadow look-ups.
- *
- * If there is no shadow comparison, this will be \c NULL. For the
- * \c ir_txf opcode, this *must* be \c NULL.
- */
- ir_rvalue *shadow_comparitor;
-
- /** Explicit texel offsets. */
- signed char offsets[3];
-
- union {
- ir_rvalue *lod; /**< Floating point LOD */
- ir_rvalue *bias; /**< Floating point LOD bias */
- struct {
- ir_rvalue *dPdx; /**< Partial derivative of coordinate wrt X */
- ir_rvalue *dPdy; /**< Partial derivative of coordinate wrt Y */
- } grad;
- } lod_info;
-};
-
-
-struct ir_swizzle_mask {
- unsigned x:2;
- unsigned y:2;
- unsigned z:2;
- unsigned w:2;
-
- /**
- * Number of components in the swizzle.
- */
- unsigned num_components:3;
-
- /**
- * Does the swizzle contain duplicate components?
- *
- * L-value swizzles cannot contain duplicate components.
- */
- unsigned has_duplicates:1;
-};
-
-
-class ir_swizzle : public ir_rvalue {
-public:
- ir_swizzle(ir_rvalue *, unsigned x, unsigned y, unsigned z, unsigned w,
- unsigned count);
-
- ir_swizzle(ir_rvalue *val, const unsigned *components, unsigned count);
-
- ir_swizzle(ir_rvalue *val, ir_swizzle_mask mask);
-
- virtual ir_swizzle *clone(void *mem_ctx, struct hash_table *) const;
-
- virtual ir_constant *constant_expression_value();
-
- virtual ir_swizzle *as_swizzle()
- {
- return this;
- }
-
- /**
- * Construct an ir_swizzle from the textual representation. Can fail.
- */
- static ir_swizzle *create(ir_rvalue *, const char *, unsigned vector_length);
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- bool is_lvalue()
- {
- return val->is_lvalue() && !mask.has_duplicates;
- }
-
- /**
- * Get the variable that is ultimately referenced by an r-value
- */
- virtual ir_variable *variable_referenced();
-
- ir_rvalue *val;
- ir_swizzle_mask mask;
-
-private:
- /**
- * Initialize the mask component of a swizzle
- *
- * This is used by the \c ir_swizzle constructors.
- */
- void init_mask(const unsigned *components, unsigned count);
-};
-
-
-class ir_dereference : public ir_rvalue {
-public:
- virtual ir_dereference *clone(void *mem_ctx, struct hash_table *) const = 0;
-
- virtual ir_dereference *as_dereference()
- {
- return this;
- }
-
- bool is_lvalue();
-
- /**
- * Get the variable that is ultimately referenced by an r-value
- */
- virtual ir_variable *variable_referenced() = 0;
-};
-
-
-class ir_dereference_variable : public ir_dereference {
-public:
- ir_dereference_variable(ir_variable *var);
-
- virtual ir_dereference_variable *clone(void *mem_ctx,
- struct hash_table *) const;
-
- virtual ir_constant *constant_expression_value();
-
- virtual ir_dereference_variable *as_dereference_variable()
- {
- return this;
- }
-
- /**
- * Get the variable that is ultimately referenced by an r-value
- */
- virtual ir_variable *variable_referenced()
- {
- return this->var;
- }
-
- virtual ir_variable *whole_variable_referenced()
- {
- /* ir_dereference_variable objects always dereference the entire
- * variable. However, if this dereference is dereferenced by anything
- * else, the complete deferefernce chain is not a whole-variable
- * dereference. This method should only be called on the top most
- * ir_rvalue in a dereference chain.
- */
- return this->var;
- }
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- /**
- * Object being dereferenced.
- */
- ir_variable *var;
-};
-
-
-class ir_dereference_array : public ir_dereference {
-public:
- ir_dereference_array(ir_rvalue *value, ir_rvalue *array_index);
-
- ir_dereference_array(ir_variable *var, ir_rvalue *array_index);
-
- virtual ir_dereference_array *clone(void *mem_ctx,
- struct hash_table *) const;
-
- virtual ir_constant *constant_expression_value();
-
- virtual ir_dereference_array *as_dereference_array()
- {
- return this;
- }
-
- /**
- * Get the variable that is ultimately referenced by an r-value
- */
- virtual ir_variable *variable_referenced()
- {
- return this->array->variable_referenced();
- }
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- ir_rvalue *array;
- ir_rvalue *array_index;
-
-private:
- void set_array(ir_rvalue *value);
-};
-
-
-class ir_dereference_record : public ir_dereference {
-public:
- ir_dereference_record(ir_rvalue *value, const char *field);
-
- ir_dereference_record(ir_variable *var, const char *field);
-
- virtual ir_dereference_record *clone(void *mem_ctx,
- struct hash_table *) const;
-
- virtual ir_constant *constant_expression_value();
-
- /**
- * Get the variable that is ultimately referenced by an r-value
- */
- virtual ir_variable *variable_referenced()
- {
- return this->record->variable_referenced();
- }
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- ir_rvalue *record;
- const char *field;
-};
-
-
-/**
- * Data stored in an ir_constant
- */
-union ir_constant_data {
- unsigned u[16];
- int i[16];
- float f[16];
- bool b[16];
-};
-
-
-class ir_constant : public ir_rvalue {
-public:
- ir_constant(const struct glsl_type *type, const ir_constant_data *data);
- ir_constant(bool b);
- ir_constant(unsigned int u);
- ir_constant(int i);
- ir_constant(float f);
-
- /**
- * Construct an ir_constant from a list of ir_constant values
- */
- ir_constant(const struct glsl_type *type, exec_list *values);
-
- /**
- * Construct an ir_constant from a scalar component of another ir_constant
- *
- * The new \c ir_constant inherits the type of the component from the
- * source constant.
- *
- * \note
- * In the case of a matrix constant, the new constant is a scalar, \b not
- * a vector.
- */
- ir_constant(const ir_constant *c, unsigned i);
-
- /**
- * Return a new ir_constant of the specified type containing all zeros.
- */
- static ir_constant *zero(void *mem_ctx, const glsl_type *type);
-
- virtual ir_constant *clone(void *mem_ctx, struct hash_table *) const;
-
- virtual ir_constant *constant_expression_value();
-
- virtual ir_constant *as_constant()
- {
- return this;
- }
-
- virtual void accept(ir_visitor *v)
- {
- v->visit(this);
- }
-
- virtual ir_visitor_status accept(ir_hierarchical_visitor *);
-
- /**
- * Get a particular component of a constant as a specific type
- *
- * This is useful, for example, to get a value from an integer constant
- * as a float or bool. This appears frequently when constructors are
- * called with all constant parameters.
- */
- /*@{*/
- bool get_bool_component(unsigned i) const;
- float get_float_component(unsigned i) const;
- int get_int_component(unsigned i) const;
- unsigned get_uint_component(unsigned i) const;
- /*@}*/
-
- ir_constant *get_array_element(unsigned i) const;
-
- ir_constant *get_record_field(const char *name);
-
- /**
- * Determine whether a constant has the same value as another constant
- */
- bool has_value(const ir_constant *) const;
-
- /**
- * Value of the constant.
- *
- * The field used to back the values supplied by the constant is determined
- * by the type associated with the \c ir_instruction. Constants may be
- * scalars, vectors, or matrices.
- */
- union ir_constant_data value;
-
- /* Array elements */
- ir_constant **array_elements;
-
- /* Structure fields */
- exec_list components;
-
-private:
- /**
- * Parameterless constructor only used by the clone method
- */
- ir_constant(void);
-};
-
-/*@}*/
-
-/**
- * Apply a visitor to each IR node in a list
- */
-void
-visit_exec_list(exec_list *list, ir_visitor *visitor);
-
-/**
- * Validate invariants on each IR node in a list
- */
-void validate_ir_tree(exec_list *instructions);
-
-/**
- * Make a clone of each IR instruction in a list
- *
- * \param in List of IR instructions that are to be cloned
- * \param out List to hold the cloned instructions
- */
-void
-clone_ir_list(void *mem_ctx, exec_list *out, const exec_list *in);
-
-extern void
-_mesa_glsl_initialize_variables(exec_list *instructions,
- struct _mesa_glsl_parse_state *state);
-
-extern void
-_mesa_glsl_initialize_functions(exec_list *instructions,
- struct _mesa_glsl_parse_state *state);
-
-extern void
-_mesa_glsl_release_functions(void);
-
-extern void
-reparent_ir(exec_list *list, void *mem_ctx);
-
-struct glsl_symbol_table;
-
-extern void
-import_prototypes(const exec_list *source, exec_list *dest,
- struct glsl_symbol_table *symbols, void *mem_ctx);
-
-extern bool
-ir_has_call(ir_instruction *ir);
-
-extern void
-do_set_program_inouts(exec_list *instructions, struct gl_program *prog);
-
-#endif /* IR_H */
+/* -*- c++ -*- */
+/*
+ * 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.
+ */
+
+#pragma once
+#ifndef IR_H
+#define IR_H
+
+#include <cstdio>
+#include <cstdlib>
+
+extern "C" {
+#include <talloc.h>
+}
+
+#include "glsl_types.h"
+#include "list.h"
+#include "ir_visitor.h"
+#include "ir_hierarchical_visitor.h"
+
+/**
+ * \defgroup IR Intermediate representation nodes
+ *
+ * @{
+ */
+
+/**
+ * Class tags
+ *
+ * Each concrete class derived from \c ir_instruction has a value in this
+ * enumerant. The value for the type is stored in \c ir_instruction::ir_type
+ * by the constructor. While using type tags is not very C++, it is extremely
+ * convenient. For example, during debugging you can simply inspect
+ * \c ir_instruction::ir_type to find out the actual type of the object.
+ *
+ * In addition, it is possible to use a switch-statement based on \c
+ * \c ir_instruction::ir_type to select different behavior for different object
+ * types. For functions that have only slight differences for several object
+ * types, this allows writing very straightforward, readable code.
+ */
+enum ir_node_type {
+ /**
+ * Zero is unused so that the IR validator can detect cases where
+ * \c ir_instruction::ir_type has not been initialized.
+ */
+ ir_type_unset,
+ ir_type_variable,
+ ir_type_assignment,
+ ir_type_call,
+ ir_type_constant,
+ ir_type_dereference_array,
+ ir_type_dereference_record,
+ ir_type_dereference_variable,
+ ir_type_discard,
+ ir_type_expression,
+ ir_type_function,
+ ir_type_function_signature,
+ ir_type_if,
+ ir_type_loop,
+ ir_type_loop_jump,
+ ir_type_return,
+ ir_type_swizzle,
+ ir_type_texture,
+ ir_type_max /**< maximum ir_type enum number, for validation */
+};
+
+/**
+ * Base class of all IR instructions
+ */
+class ir_instruction : public exec_node {
+public:
+ enum ir_node_type ir_type;
+ const struct glsl_type *type;
+
+ /** ir_print_visitor helper for debugging. */
+ void print(void) const;
+
+ virtual void accept(ir_visitor *) = 0;
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *) = 0;
+ virtual ir_instruction *clone(void *mem_ctx,
+ struct hash_table *ht) const = 0;
+
+ /**
+ * \name IR instruction downcast functions
+ *
+ * These functions either cast the object to a derived class or return
+ * \c NULL if the object's type does not match the specified derived class.
+ * Additional downcast functions will be added as needed.
+ */
+ /*@{*/
+ virtual class ir_variable * as_variable() { return NULL; }
+ virtual class ir_function * as_function() { return NULL; }
+ virtual class ir_dereference * as_dereference() { return NULL; }
+ virtual class ir_dereference_array * as_dereference_array() { return NULL; }
+ virtual class ir_dereference_variable *as_dereference_variable() { return NULL; }
+ virtual class ir_expression * as_expression() { return NULL; }
+ virtual class ir_rvalue * as_rvalue() { return NULL; }
+ virtual class ir_loop * as_loop() { return NULL; }
+ virtual class ir_assignment * as_assignment() { return NULL; }
+ virtual class ir_call * as_call() { return NULL; }
+ virtual class ir_return * as_return() { return NULL; }
+ virtual class ir_if * as_if() { return NULL; }
+ virtual class ir_swizzle * as_swizzle() { return NULL; }
+ virtual class ir_constant * as_constant() { return NULL; }
+ virtual class ir_discard * as_discard() { return NULL; }
+ /*@}*/
+
+protected:
+ ir_instruction()
+ {
+ ir_type = ir_type_unset;
+ type = NULL;
+ }
+};
+
+
+class ir_rvalue : public ir_instruction {
+public:
+ virtual ir_rvalue *clone(void *mem_ctx, struct hash_table *) const = 0;
+
+ virtual ir_constant *constant_expression_value() = 0;
+
+ virtual ir_rvalue * as_rvalue()
+ {
+ return this;
+ }
+
+ ir_rvalue *as_rvalue_to_saturate();
+
+ virtual bool is_lvalue()
+ {
+ return false;
+ }
+
+ /**
+ * Get the variable that is ultimately referenced by an r-value
+ */
+ virtual ir_variable *variable_referenced()
+ {
+ return NULL;
+ }
+
+
+ /**
+ * If an r-value is a reference to a whole variable, get that variable
+ *
+ * \return
+ * Pointer to a variable that is completely dereferenced by the r-value. If
+ * the r-value is not a dereference or the dereference does not access the
+ * entire variable (i.e., it's just one array element, struct field), \c NULL
+ * is returned.
+ */
+ virtual ir_variable *whole_variable_referenced()
+ {
+ return NULL;
+ }
+
+ /**
+ * Determine if an r-value has the value zero
+ *
+ * The base implementation of this function always returns \c false. The
+ * \c ir_constant class over-rides this function to return \c true \b only
+ * for vector and scalar types that have all elements set to the value
+ * zero (or \c false for booleans).
+ *
+ * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one
+ */
+ virtual bool is_zero() const;
+
+ /**
+ * Determine if an r-value has the value one
+ *
+ * The base implementation of this function always returns \c false. The
+ * \c ir_constant class over-rides this function to return \c true \b only
+ * for vector and scalar types that have all elements set to the value
+ * one (or \c true for booleans).
+ *
+ * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one
+ */
+ virtual bool is_one() const;
+
+ /**
+ * Determine if an r-value has the value negative one
+ *
+ * The base implementation of this function always returns \c false. The
+ * \c ir_constant class over-rides this function to return \c true \b only
+ * for vector and scalar types that have all elements set to the value
+ * negative one. For boolean times, the result is always \c false.
+ *
+ * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one
+ */
+ virtual bool is_negative_one() const;
+
+protected:
+ ir_rvalue();
+};
+
+
+/**
+ * Variable storage classes
+ */
+enum ir_variable_mode {
+ ir_var_auto = 0, /**< Function local variables and globals. */
+ ir_var_uniform, /**< Variable declared as a uniform. */
+ ir_var_in,
+ ir_var_out,
+ ir_var_inout,
+ ir_var_temporary /**< Temporary variable generated during compilation. */
+};
+
+enum ir_variable_interpolation {
+ ir_var_smooth = 0,
+ ir_var_flat,
+ ir_var_noperspective
+};
+
+
+class ir_variable : public ir_instruction {
+public:
+ ir_variable(const struct glsl_type *, const char *, ir_variable_mode);
+
+ virtual ir_variable *clone(void *mem_ctx, struct hash_table *ht) const;
+
+ virtual ir_variable *as_variable()
+ {
+ return this;
+ }
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+
+ /**
+ * Get the string value for the interpolation qualifier
+ *
+ * \return The string that would be used in a shader to specify \c
+ * mode will be returned.
+ *
+ * This function should only be used on a shader input or output variable.
+ */
+ const char *interpolation_string() const;
+
+ /**
+ * Calculate the number of slots required to hold this variable
+ *
+ * This is used to determine how many uniform or varying locations a variable
+ * occupies. The count is in units of floating point components.
+ */
+ unsigned component_slots() const;
+
+ /**
+ * Delcared name of the variable
+ */
+ const char *name;
+
+ /**
+ * Highest element accessed with a constant expression array index
+ *
+ * Not used for non-array variables.
+ */
+ unsigned max_array_access;
+
+ /**
+ * Is the variable read-only?
+ *
+ * This is set for variables declared as \c const, shader inputs,
+ * and uniforms.
+ */
+ unsigned read_only:1;
+ unsigned centroid:1;
+ unsigned invariant:1;
+
+ /**
+ * Storage class of the variable.
+ *
+ * \sa ir_variable_mode
+ */
+ unsigned mode:3;
+
+ /**
+ * Interpolation mode for shader inputs / outputs
+ *
+ * \sa ir_variable_interpolation
+ */
+ unsigned interpolation:2;
+
+ /**
+ * Flag that the whole array is assignable
+ *
+ * In GLSL 1.20 and later whole arrays are assignable (and comparable for
+ * equality). This flag enables this behavior.
+ */
+ unsigned array_lvalue:1;
+
+ /**
+ * \name ARB_fragment_coord_conventions
+ * @{
+ */
+ unsigned origin_upper_left:1;
+ unsigned pixel_center_integer:1;
+ /*@}*/
+
+ /**
+ * Was the location explicitly set in the shader?
+ *
+ * If the location is explicitly set in the shader, it \b cannot be changed
+ * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
+ * no effect).
+ */
+ unsigned explicit_location:1;
+
+ /**
+ * Storage location of the base of this variable
+ *
+ * The precise meaning of this field depends on the nature of the variable.
+ *
+ * - Vertex shader input: one of the values from \c gl_vert_attrib.
+ * - Vertex shader output: one of the values from \c gl_vert_result.
+ * - Fragment shader input: one of the values from \c gl_frag_attrib.
+ * - Fragment shader output: one of the values from \c gl_frag_result.
+ * - Uniforms: Per-stage uniform slot number.
+ * - Other: This field is not currently used.
+ *
+ * If the variable is a uniform, shader input, or shader output, and the
+ * slot has not been assigned, the value will be -1.
+ */
+ int location;
+
+ /**
+ * Emit a warning if this variable is accessed.
+ */
+ const char *warn_extension;
+
+ /**
+ * Value assigned in the initializer of a variable declared "const"
+ */
+ ir_constant *constant_value;
+};
+
+
+/*@{*/
+/**
+ * The representation of a function instance; may be the full definition or
+ * simply a prototype.
+ */
+class ir_function_signature : public ir_instruction {
+ /* An ir_function_signature will be part of the list of signatures in
+ * an ir_function.
+ */
+public:
+ ir_function_signature(const glsl_type *return_type);
+
+ virtual ir_function_signature *clone(void *mem_ctx,
+ struct hash_table *ht) const;
+ ir_function_signature *clone_prototype(void *mem_ctx,
+ struct hash_table *ht) const;
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ /**
+ * Get the name of the function for which this is a signature
+ */
+ const char *function_name() const;
+
+ /**
+ * Get a handle to the function for which this is a signature
+ *
+ * There is no setter function, this function returns a \c const pointer,
+ * and \c ir_function_signature::_function is private for a reason. The
+ * only way to make a connection between a function and function signature
+ * is via \c ir_function::add_signature. This helps ensure that certain
+ * invariants (i.e., a function signature is in the list of signatures for
+ * its \c _function) are met.
+ *
+ * \sa ir_function::add_signature
+ */
+ inline const class ir_function *function() const
+ {
+ return this->_function;
+ }
+
+ /**
+ * Check whether the qualifiers match between this signature's parameters
+ * and the supplied parameter list. If not, returns the name of the first
+ * parameter with mismatched qualifiers (for use in error messages).
+ */
+ const char *qualifiers_match(exec_list *params);
+
+ /**
+ * Replace the current parameter list with the given one. This is useful
+ * if the current information came from a prototype, and either has invalid
+ * or missing parameter names.
+ */
+ void replace_parameters(exec_list *new_params);
+
+ /**
+ * Function return type.
+ *
+ * \note This discards the optional precision qualifier.
+ */
+ const struct glsl_type *return_type;
+
+ /**
+ * List of ir_variable of function parameters.
+ *
+ * This represents the storage. The paramaters passed in a particular
+ * call will be in ir_call::actual_paramaters.
+ */
+ struct exec_list parameters;
+
+ /** Whether or not this function has a body (which may be empty). */
+ unsigned is_defined:1;
+
+ /** Whether or not this function signature is a built-in. */
+ unsigned is_builtin:1;
+
+ /** Body of instructions in the function. */
+ struct exec_list body;
+
+private:
+ /** Function of which this signature is one overload. */
+ class ir_function *_function;
+
+ friend class ir_function;
+};
+
+
+/**
+ * Header for tracking multiple overloaded functions with the same name.
+ * Contains a list of ir_function_signatures representing each of the
+ * actual functions.
+ */
+class ir_function : public ir_instruction {
+public:
+ ir_function(const char *name);
+
+ virtual ir_function *clone(void *mem_ctx, struct hash_table *ht) const;
+
+ virtual ir_function *as_function()
+ {
+ return this;
+ }
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ void add_signature(ir_function_signature *sig)
+ {
+ sig->_function = this;
+ this->signatures.push_tail(sig);
+ }
+
+ /**
+ * Get an iterator for the set of function signatures
+ */
+ exec_list_iterator iterator()
+ {
+ return signatures.iterator();
+ }
+
+ /**
+ * Find a signature that matches a set of actual parameters, taking implicit
+ * conversions into account.
+ */
+ ir_function_signature *matching_signature(const exec_list *actual_param);
+
+ /**
+ * Find a signature that exactly matches a set of actual parameters without
+ * any implicit type conversions.
+ */
+ ir_function_signature *exact_matching_signature(const exec_list *actual_ps);
+
+ /**
+ * Name of the function.
+ */
+ const char *name;
+
+ /** Whether or not this function has a signature that isn't a built-in. */
+ bool has_user_signature();
+
+ /**
+ * List of ir_function_signature for each overloaded function with this name.
+ */
+ struct exec_list signatures;
+};
+
+inline const char *ir_function_signature::function_name() const
+{
+ return this->_function->name;
+}
+/*@}*/
+
+
+/**
+ * IR instruction representing high-level if-statements
+ */
+class ir_if : public ir_instruction {
+public:
+ ir_if(ir_rvalue *condition)
+ : condition(condition)
+ {
+ ir_type = ir_type_if;
+ }
+
+ virtual ir_if *clone(void *mem_ctx, struct hash_table *ht) const;
+
+ virtual ir_if *as_if()
+ {
+ return this;
+ }
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ ir_rvalue *condition;
+ /** List of ir_instruction for the body of the then branch */
+ exec_list then_instructions;
+ /** List of ir_instruction for the body of the else branch */
+ exec_list else_instructions;
+};
+
+
+/**
+ * IR instruction representing a high-level loop structure.
+ */
+class ir_loop : public ir_instruction {
+public:
+ ir_loop();
+
+ virtual ir_loop *clone(void *mem_ctx, struct hash_table *ht) const;
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ virtual ir_loop *as_loop()
+ {
+ return this;
+ }
+
+ /**
+ * Get an iterator for the instructions of the loop body
+ */
+ exec_list_iterator iterator()
+ {
+ return body_instructions.iterator();
+ }
+
+ /** List of ir_instruction that make up the body of the loop. */
+ exec_list body_instructions;
+
+ /**
+ * \name Loop counter and controls
+ *
+ * Represents a loop like a FORTRAN \c do-loop.
+ *
+ * \note
+ * If \c from and \c to are the same value, the loop will execute once.
+ */
+ /*@{*/
+ ir_rvalue *from; /** Value of the loop counter on the first
+ * iteration of the loop.
+ */
+ ir_rvalue *to; /** Value of the loop counter on the last
+ * iteration of the loop.
+ */
+ ir_rvalue *increment;
+ ir_variable *counter;
+
+ /**
+ * Comparison operation in the loop terminator.
+ *
+ * If any of the loop control fields are non-\c NULL, this field must be
+ * one of \c ir_binop_less, \c ir_binop_greater, \c ir_binop_lequal,
+ * \c ir_binop_gequal, \c ir_binop_equal, or \c ir_binop_nequal.
+ */
+ int cmp;
+ /*@}*/
+};
+
+
+class ir_assignment : public ir_instruction {
+public:
+ ir_assignment(ir_rvalue *lhs, ir_rvalue *rhs, ir_rvalue *condition);
+
+ /**
+ * Construct an assignment with an explicit write mask
+ *
+ * \note
+ * Since a write mask is supplied, the LHS must already be a bare
+ * \c ir_dereference. The cannot be any swizzles in the LHS.
+ */
+ ir_assignment(ir_dereference *lhs, ir_rvalue *rhs, ir_rvalue *condition,
+ unsigned write_mask);
+
+ virtual ir_assignment *clone(void *mem_ctx, struct hash_table *ht) const;
+
+ virtual ir_constant *constant_expression_value();
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ virtual ir_assignment * as_assignment()
+ {
+ return this;
+ }
+
+ /**
+ * Get a whole variable written by an assignment
+ *
+ * If the LHS of the assignment writes a whole variable, the variable is
+ * returned. Otherwise \c NULL is returned. Examples of whole-variable
+ * assignment are:
+ *
+ * - Assigning to a scalar
+ * - Assigning to all components of a vector
+ * - Whole array (or matrix) assignment
+ * - Whole structure assignment
+ */
+ ir_variable *whole_variable_written();
+
+ /**
+ * Set the LHS of an assignment
+ */
+ void set_lhs(ir_rvalue *lhs);
+
+ /**
+ * Left-hand side of the assignment.
+ *
+ * This should be treated as read only. If you need to set the LHS of an
+ * assignment, use \c ir_assignment::set_lhs.
+ */
+ ir_dereference *lhs;
+
+ /**
+ * Value being assigned
+ */
+ ir_rvalue *rhs;
+
+ /**
+ * Optional condition for the assignment.
+ */
+ ir_rvalue *condition;
+
+
+ /**
+ * Component mask written
+ *
+ * For non-vector types in the LHS, this field will be zero. For vector
+ * types, a bit will be set for each component that is written. Note that
+ * for \c vec2 and \c vec3 types only the lower bits will ever be set.
+ *
+ * A partially-set write mask means that each enabled channel gets
+ * the value from a consecutive channel of the rhs. For example,
+ * to write just .xyw of gl_FrontColor with color:
+ *
+ * (assign (constant bool (1)) (xyw)
+ * (var_ref gl_FragColor)
+ * (swiz xyw (var_ref color)))
+ */
+ unsigned write_mask:4;
+};
+
+/* Update ir_expression::num_operands() and operator_strs when
+ * updating this list.
+ */
+enum ir_expression_operation {
+ ir_unop_bit_not,
+ ir_unop_logic_not,
+ ir_unop_neg,
+ ir_unop_abs,
+ ir_unop_sign,
+ ir_unop_rcp,
+ ir_unop_rsq,
+ ir_unop_sqrt,
+ ir_unop_exp, /**< Log base e on gentype */
+ ir_unop_log, /**< Natural log on gentype */
+ ir_unop_exp2,
+ ir_unop_log2,
+ ir_unop_f2i, /**< Float-to-integer conversion. */
+ ir_unop_i2f, /**< Integer-to-float conversion. */
+ ir_unop_f2b, /**< Float-to-boolean conversion */
+ ir_unop_b2f, /**< Boolean-to-float conversion */
+ ir_unop_i2b, /**< int-to-boolean conversion */
+ ir_unop_b2i, /**< Boolean-to-int conversion */
+ ir_unop_u2f, /**< Unsigned-to-float conversion. */
+ ir_unop_any,
+
+ /**
+ * \name Unary floating-point rounding operations.
+ */
+ /*@{*/
+ ir_unop_trunc,
+ ir_unop_ceil,
+ ir_unop_floor,
+ ir_unop_fract,
+ ir_unop_round_even,
+ /*@}*/
+
+ /**
+ * \name Trigonometric operations.
+ */
+ /*@{*/
+ ir_unop_sin,
+ ir_unop_cos,
+ ir_unop_sin_reduced, /**< Reduced range sin. [-pi, pi] */
+ ir_unop_cos_reduced, /**< Reduced range cos. [-pi, pi] */
+ /*@}*/
+
+ /**
+ * \name Partial derivatives.
+ */
+ /*@{*/
+ ir_unop_dFdx,
+ ir_unop_dFdy,
+ /*@}*/
+
+ ir_unop_noise,
+
+ /**
+ * A sentinel marking the last of the unary operations.
+ */
+ ir_last_unop = ir_unop_noise,
+
+ ir_binop_add,
+ ir_binop_sub,
+ ir_binop_mul,
+ ir_binop_div,
+
+ /**
+ * Takes one of two combinations of arguments:
+ *
+ * - mod(vecN, vecN)
+ * - mod(vecN, float)
+ *
+ * Does not take integer types.
+ */
+ ir_binop_mod,
+
+ /**
+ * \name Binary comparison operators which return a boolean vector.
+ * The type of both operands must be equal.
+ */
+ /*@{*/
+ ir_binop_less,
+ ir_binop_greater,
+ ir_binop_lequal,
+ ir_binop_gequal,
+ ir_binop_equal,
+ ir_binop_nequal,
+ /**
+ * Returns single boolean for whether all components of operands[0]
+ * equal the components of operands[1].
+ */
+ ir_binop_all_equal,
+ /**
+ * Returns single boolean for whether any component of operands[0]
+ * is not equal to the corresponding component of operands[1].
+ */
+ ir_binop_any_nequal,
+ /*@}*/
+
+ /**
+ * \name Bit-wise binary operations.
+ */
+ /*@{*/
+ ir_binop_lshift,
+ ir_binop_rshift,
+ ir_binop_bit_and,
+ ir_binop_bit_xor,
+ ir_binop_bit_or,
+ /*@}*/
+
+ ir_binop_logic_and,
+ ir_binop_logic_xor,
+ ir_binop_logic_or,
+
+ ir_binop_dot,
+ ir_binop_min,
+ ir_binop_max,
+
+ ir_binop_pow,
+
+ /**
+ * A sentinel marking the last of the binary operations.
+ */
+ ir_last_binop = ir_binop_pow,
+
+ ir_quadop_vector,
+
+ /**
+ * A sentinel marking the last of all operations.
+ */
+ ir_last_opcode = ir_last_binop
+};
+
+class ir_expression : public ir_rvalue {
+public:
+ /**
+ * Constructor for unary operation expressions
+ */
+ ir_expression(int op, const struct glsl_type *type, ir_rvalue *);
+ ir_expression(int op, ir_rvalue *);
+
+ /**
+ * Constructor for binary operation expressions
+ */
+ ir_expression(int op, const struct glsl_type *type,
+ ir_rvalue *, ir_rvalue *);
+ ir_expression(int op, ir_rvalue *op0, ir_rvalue *op1);
+
+ /**
+ * Constructor for quad operator expressions
+ */
+ ir_expression(int op, const struct glsl_type *type,
+ ir_rvalue *, ir_rvalue *, ir_rvalue *, ir_rvalue *);
+
+ virtual ir_expression *as_expression()
+ {
+ return this;
+ }
+
+ virtual ir_expression *clone(void *mem_ctx, struct hash_table *ht) const;
+
+ /**
+ * Attempt to constant-fold the expression
+ *
+ * If the expression cannot be constant folded, this method will return
+ * \c NULL.
+ */
+ virtual ir_constant *constant_expression_value();
+
+ /**
+ * Determine the number of operands used by an expression
+ */
+ static unsigned int get_num_operands(ir_expression_operation);
+
+ /**
+ * Determine the number of operands used by an expression
+ */
+ unsigned int get_num_operands() const
+ {
+ return (this->operation == ir_quadop_vector)
+ ? this->type->vector_elements : get_num_operands(operation);
+ }
+
+ /**
+ * Return a string representing this expression's operator.
+ */
+ const char *operator_string();
+
+ /**
+ * Return a string representing this expression's operator.
+ */
+ static const char *operator_string(ir_expression_operation);
+
+
+ /**
+ * Do a reverse-lookup to translate the given string into an operator.
+ */
+ static ir_expression_operation get_operator(const char *);
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ ir_expression_operation operation;
+ ir_rvalue *operands[4];
+};
+
+
+/**
+ * IR instruction representing a function call
+ */
+class ir_call : public ir_rvalue {
+public:
+ ir_call(ir_function_signature *callee, exec_list *actual_parameters)
+ : callee(callee)
+ {
+ ir_type = ir_type_call;
+ assert(callee->return_type != NULL);
+ type = callee->return_type;
+ actual_parameters->move_nodes_to(& this->actual_parameters);
+ }
+
+ virtual ir_call *clone(void *mem_ctx, struct hash_table *ht) const;
+
+ virtual ir_constant *constant_expression_value();
+
+ virtual ir_call *as_call()
+ {
+ return this;
+ }
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ /**
+ * Get a generic ir_call object when an error occurs
+ *
+ * Any allocation will be performed with 'ctx' as talloc owner.
+ */
+ static ir_call *get_error_instruction(void *ctx);
+
+ /**
+ * Get an iterator for the set of acutal parameters
+ */
+ exec_list_iterator iterator()
+ {
+ return actual_parameters.iterator();
+ }
+
+ /**
+ * Get the name of the function being called.
+ */
+ const char *callee_name() const
+ {
+ return callee->function_name();
+ }
+
+ /**
+ * Get the function signature bound to this function call
+ */
+ ir_function_signature *get_callee()
+ {
+ return callee;
+ }
+
+ /**
+ * Set the function call target
+ */
+ void set_callee(ir_function_signature *sig);
+
+ /**
+ * Generates an inline version of the function before @ir,
+ * returning the return value of the function.
+ */
+ ir_rvalue *generate_inline(ir_instruction *ir);
+
+ /* List of ir_rvalue of paramaters passed in this call. */
+ exec_list actual_parameters;
+
+private:
+ ir_call()
+ : callee(NULL)
+ {
+ this->ir_type = ir_type_call;
+ }
+
+ ir_function_signature *callee;
+};
+
+
+/**
+ * \name Jump-like IR instructions.
+ *
+ * These include \c break, \c continue, \c return, and \c discard.
+ */
+/*@{*/
+class ir_jump : public ir_instruction {
+protected:
+ ir_jump()
+ {
+ ir_type = ir_type_unset;
+ }
+};
+
+class ir_return : public ir_jump {
+public:
+ ir_return()
+ : value(NULL)
+ {
+ this->ir_type = ir_type_return;
+ }
+
+ ir_return(ir_rvalue *value)
+ : value(value)
+ {
+ this->ir_type = ir_type_return;
+ }
+
+ virtual ir_return *clone(void *mem_ctx, struct hash_table *) const;
+
+ virtual ir_return *as_return()
+ {
+ return this;
+ }
+
+ ir_rvalue *get_value() const
+ {
+ return value;
+ }
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ ir_rvalue *value;
+};
+
+
+/**
+ * Jump instructions used inside loops
+ *
+ * These include \c break and \c continue. The \c break within a loop is
+ * different from the \c break within a switch-statement.
+ *
+ * \sa ir_switch_jump
+ */
+class ir_loop_jump : public ir_jump {
+public:
+ enum jump_mode {
+ jump_break,
+ jump_continue
+ };
+
+ ir_loop_jump(jump_mode mode)
+ {
+ this->ir_type = ir_type_loop_jump;
+ this->mode = mode;
+ this->loop = loop;
+ }
+
+ virtual ir_loop_jump *clone(void *mem_ctx, struct hash_table *) const;
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ bool is_break() const
+ {
+ return mode == jump_break;
+ }
+
+ bool is_continue() const
+ {
+ return mode == jump_continue;
+ }
+
+ /** Mode selector for the jump instruction. */
+ enum jump_mode mode;
+private:
+ /** Loop containing this break instruction. */
+ ir_loop *loop;
+};
+
+/**
+ * IR instruction representing discard statements.
+ */
+class ir_discard : public ir_jump {
+public:
+ ir_discard()
+ {
+ this->ir_type = ir_type_discard;
+ this->condition = NULL;
+ }
+
+ ir_discard(ir_rvalue *cond)
+ {
+ this->ir_type = ir_type_discard;
+ this->condition = cond;
+ }
+
+ virtual ir_discard *clone(void *mem_ctx, struct hash_table *ht) const;
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ virtual ir_discard *as_discard()
+ {
+ return this;
+ }
+
+ ir_rvalue *condition;
+};
+/*@}*/
+
+
+/**
+ * Texture sampling opcodes used in ir_texture
+ */
+enum ir_texture_opcode {
+ ir_tex, /**< Regular texture look-up */
+ ir_txb, /**< Texture look-up with LOD bias */
+ ir_txl, /**< Texture look-up with explicit LOD */
+ ir_txd, /**< Texture look-up with partial derivatvies */
+ ir_txf /**< Texel fetch with explicit LOD */
+};
+
+
+/**
+ * IR instruction to sample a texture
+ *
+ * The specific form of the IR instruction depends on the \c mode value
+ * selected from \c ir_texture_opcodes. In the printed IR, these will
+ * appear as:
+ *
+ * Texel offset
+ * | Projection divisor
+ * | | Shadow comparitor
+ * | | |
+ * v v v
+ * (tex (sampler) (coordinate) (0 0 0) (1) ( ))
+ * (txb (sampler) (coordinate) (0 0 0) (1) ( ) (bias))
+ * (txl (sampler) (coordinate) (0 0 0) (1) ( ) (lod))
+ * (txd (sampler) (coordinate) (0 0 0) (1) ( ) (dPdx dPdy))
+ * (txf (sampler) (coordinate) (0 0 0) (lod))
+ */
+class ir_texture : public ir_rvalue {
+public:
+ ir_texture(enum ir_texture_opcode op)
+ : op(op), projector(NULL), shadow_comparitor(NULL)
+ {
+ this->ir_type = ir_type_texture;
+ }
+
+ virtual ir_texture *clone(void *mem_ctx, struct hash_table *) const;
+
+ virtual ir_constant *constant_expression_value();
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ /**
+ * Return a string representing the ir_texture_opcode.
+ */
+ const char *opcode_string();
+
+ /** Set the sampler and infer the type. */
+ void set_sampler(ir_dereference *sampler);
+
+ /**
+ * Do a reverse-lookup to translate a string into an ir_texture_opcode.
+ */
+ static ir_texture_opcode get_opcode(const char *);
+
+ enum ir_texture_opcode op;
+
+ /** Sampler to use for the texture access. */
+ ir_dereference *sampler;
+
+ /** Texture coordinate to sample */
+ ir_rvalue *coordinate;
+
+ /**
+ * Value used for projective divide.
+ *
+ * If there is no projective divide (the common case), this will be
+ * \c NULL. Optimization passes should check for this to point to a constant
+ * of 1.0 and replace that with \c NULL.
+ */
+ ir_rvalue *projector;
+
+ /**
+ * Coordinate used for comparison on shadow look-ups.
+ *
+ * If there is no shadow comparison, this will be \c NULL. For the
+ * \c ir_txf opcode, this *must* be \c NULL.
+ */
+ ir_rvalue *shadow_comparitor;
+
+ /** Explicit texel offsets. */
+ signed char offsets[3];
+
+ union {
+ ir_rvalue *lod; /**< Floating point LOD */
+ ir_rvalue *bias; /**< Floating point LOD bias */
+ struct {
+ ir_rvalue *dPdx; /**< Partial derivative of coordinate wrt X */
+ ir_rvalue *dPdy; /**< Partial derivative of coordinate wrt Y */
+ } grad;
+ } lod_info;
+};
+
+
+struct ir_swizzle_mask {
+ unsigned x:2;
+ unsigned y:2;
+ unsigned z:2;
+ unsigned w:2;
+
+ /**
+ * Number of components in the swizzle.
+ */
+ unsigned num_components:3;
+
+ /**
+ * Does the swizzle contain duplicate components?
+ *
+ * L-value swizzles cannot contain duplicate components.
+ */
+ unsigned has_duplicates:1;
+};
+
+
+class ir_swizzle : public ir_rvalue {
+public:
+ ir_swizzle(ir_rvalue *, unsigned x, unsigned y, unsigned z, unsigned w,
+ unsigned count);
+
+ ir_swizzle(ir_rvalue *val, const unsigned *components, unsigned count);
+
+ ir_swizzle(ir_rvalue *val, ir_swizzle_mask mask);
+
+ virtual ir_swizzle *clone(void *mem_ctx, struct hash_table *) const;
+
+ virtual ir_constant *constant_expression_value();
+
+ virtual ir_swizzle *as_swizzle()
+ {
+ return this;
+ }
+
+ /**
+ * Construct an ir_swizzle from the textual representation. Can fail.
+ */
+ static ir_swizzle *create(ir_rvalue *, const char *, unsigned vector_length);
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ bool is_lvalue()
+ {
+ return val->is_lvalue() && !mask.has_duplicates;
+ }
+
+ /**
+ * Get the variable that is ultimately referenced by an r-value
+ */
+ virtual ir_variable *variable_referenced();
+
+ ir_rvalue *val;
+ ir_swizzle_mask mask;
+
+private:
+ /**
+ * Initialize the mask component of a swizzle
+ *
+ * This is used by the \c ir_swizzle constructors.
+ */
+ void init_mask(const unsigned *components, unsigned count);
+};
+
+
+class ir_dereference : public ir_rvalue {
+public:
+ virtual ir_dereference *clone(void *mem_ctx, struct hash_table *) const = 0;
+
+ virtual ir_dereference *as_dereference()
+ {
+ return this;
+ }
+
+ bool is_lvalue();
+
+ /**
+ * Get the variable that is ultimately referenced by an r-value
+ */
+ virtual ir_variable *variable_referenced() = 0;
+};
+
+
+class ir_dereference_variable : public ir_dereference {
+public:
+ ir_dereference_variable(ir_variable *var);
+
+ virtual ir_dereference_variable *clone(void *mem_ctx,
+ struct hash_table *) const;
+
+ virtual ir_constant *constant_expression_value();
+
+ virtual ir_dereference_variable *as_dereference_variable()
+ {
+ return this;
+ }
+
+ /**
+ * Get the variable that is ultimately referenced by an r-value
+ */
+ virtual ir_variable *variable_referenced()
+ {
+ return this->var;
+ }
+
+ virtual ir_variable *whole_variable_referenced()
+ {
+ /* ir_dereference_variable objects always dereference the entire
+ * variable. However, if this dereference is dereferenced by anything
+ * else, the complete deferefernce chain is not a whole-variable
+ * dereference. This method should only be called on the top most
+ * ir_rvalue in a dereference chain.
+ */
+ return this->var;
+ }
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ /**
+ * Object being dereferenced.
+ */
+ ir_variable *var;
+};
+
+
+class ir_dereference_array : public ir_dereference {
+public:
+ ir_dereference_array(ir_rvalue *value, ir_rvalue *array_index);
+
+ ir_dereference_array(ir_variable *var, ir_rvalue *array_index);
+
+ virtual ir_dereference_array *clone(void *mem_ctx,
+ struct hash_table *) const;
+
+ virtual ir_constant *constant_expression_value();
+
+ virtual ir_dereference_array *as_dereference_array()
+ {
+ return this;
+ }
+
+ /**
+ * Get the variable that is ultimately referenced by an r-value
+ */
+ virtual ir_variable *variable_referenced()
+ {
+ return this->array->variable_referenced();
+ }
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ ir_rvalue *array;
+ ir_rvalue *array_index;
+
+private:
+ void set_array(ir_rvalue *value);
+};
+
+
+class ir_dereference_record : public ir_dereference {
+public:
+ ir_dereference_record(ir_rvalue *value, const char *field);
+
+ ir_dereference_record(ir_variable *var, const char *field);
+
+ virtual ir_dereference_record *clone(void *mem_ctx,
+ struct hash_table *) const;
+
+ virtual ir_constant *constant_expression_value();
+
+ /**
+ * Get the variable that is ultimately referenced by an r-value
+ */
+ virtual ir_variable *variable_referenced()
+ {
+ return this->record->variable_referenced();
+ }
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ ir_rvalue *record;
+ const char *field;
+};
+
+
+/**
+ * Data stored in an ir_constant
+ */
+union ir_constant_data {
+ unsigned u[16];
+ int i[16];
+ float f[16];
+ bool b[16];
+};
+
+
+class ir_constant : public ir_rvalue {
+public:
+ ir_constant(const struct glsl_type *type, const ir_constant_data *data);
+ ir_constant(bool b);
+ ir_constant(unsigned int u);
+ ir_constant(int i);
+ ir_constant(float f);
+
+ /**
+ * Construct an ir_constant from a list of ir_constant values
+ */
+ ir_constant(const struct glsl_type *type, exec_list *values);
+
+ /**
+ * Construct an ir_constant from a scalar component of another ir_constant
+ *
+ * The new \c ir_constant inherits the type of the component from the
+ * source constant.
+ *
+ * \note
+ * In the case of a matrix constant, the new constant is a scalar, \b not
+ * a vector.
+ */
+ ir_constant(const ir_constant *c, unsigned i);
+
+ /**
+ * Return a new ir_constant of the specified type containing all zeros.
+ */
+ static ir_constant *zero(void *mem_ctx, const glsl_type *type);
+
+ virtual ir_constant *clone(void *mem_ctx, struct hash_table *) const;
+
+ virtual ir_constant *constant_expression_value();
+
+ virtual ir_constant *as_constant()
+ {
+ return this;
+ }
+
+ virtual void accept(ir_visitor *v)
+ {
+ v->visit(this);
+ }
+
+ virtual ir_visitor_status accept(ir_hierarchical_visitor *);
+
+ /**
+ * Get a particular component of a constant as a specific type
+ *
+ * This is useful, for example, to get a value from an integer constant
+ * as a float or bool. This appears frequently when constructors are
+ * called with all constant parameters.
+ */
+ /*@{*/
+ bool get_bool_component(unsigned i) const;
+ float get_float_component(unsigned i) const;
+ int get_int_component(unsigned i) const;
+ unsigned get_uint_component(unsigned i) const;
+ /*@}*/
+
+ ir_constant *get_array_element(unsigned i) const;
+
+ ir_constant *get_record_field(const char *name);
+
+ /**
+ * Determine whether a constant has the same value as another constant
+ *
+ * \sa ir_constant::is_zero, ir_constant::is_one,
+ * ir_constant::is_negative_one
+ */
+ bool has_value(const ir_constant *) const;
+
+ virtual bool is_zero() const;
+ virtual bool is_one() const;
+ virtual bool is_negative_one() const;
+
+ /**
+ * Value of the constant.
+ *
+ * The field used to back the values supplied by the constant is determined
+ * by the type associated with the \c ir_instruction. Constants may be
+ * scalars, vectors, or matrices.
+ */
+ union ir_constant_data value;
+
+ /* Array elements */
+ ir_constant **array_elements;
+
+ /* Structure fields */
+ exec_list components;
+
+private:
+ /**
+ * Parameterless constructor only used by the clone method
+ */
+ ir_constant(void);
+};
+
+/*@}*/
+
+/**
+ * Apply a visitor to each IR node in a list
+ */
+void
+visit_exec_list(exec_list *list, ir_visitor *visitor);
+
+/**
+ * Validate invariants on each IR node in a list
+ */
+void validate_ir_tree(exec_list *instructions);
+
+/**
+ * Make a clone of each IR instruction in a list
+ *
+ * \param in List of IR instructions that are to be cloned
+ * \param out List to hold the cloned instructions
+ */
+void
+clone_ir_list(void *mem_ctx, exec_list *out, const exec_list *in);
+
+extern void
+_mesa_glsl_initialize_variables(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state);
+
+extern void
+_mesa_glsl_initialize_functions(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state);
+
+extern void
+_mesa_glsl_release_functions(void);
+
+extern void
+reparent_ir(exec_list *list, void *mem_ctx);
+
+struct glsl_symbol_table;
+
+extern void
+import_prototypes(const exec_list *source, exec_list *dest,
+ struct glsl_symbol_table *symbols, void *mem_ctx);
+
+extern bool
+ir_has_call(ir_instruction *ir);
+
+extern void
+do_set_program_inouts(exec_list *instructions, struct gl_program *prog);
+
+#endif /* IR_H */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 01:21:53 +0000