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Diffstat (limited to 'mesalib/src/glsl/ir.h')
| -rw-r--r-- | mesalib/src/glsl/ir.h | 3280 |
1 files changed, 1640 insertions, 1640 deletions
diff --git a/mesalib/src/glsl/ir.h b/mesalib/src/glsl/ir.h index f2f902c0a..fcf1931ff 100644 --- a/mesalib/src/glsl/ir.h +++ b/mesalib/src/glsl/ir.h @@ -1,1640 +1,1640 @@ -/* -*- 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 <stdio.h> -#include <stdlib.h> - -#include "ralloc.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_const_in, /**< "in" param that must be a constant expression */ - ir_var_system_value, /**< Ex: front-face, instance-id, etc. */ - ir_var_temporary /**< Temporary variable generated during compilation. */ -}; - -enum ir_variable_interpolation { - ir_var_smooth = 0, - ir_var_flat, - ir_var_noperspective -}; - -/** - * \brief Layout qualifiers for gl_FragDepth. - * - * The AMD_conservative_depth extension allows gl_FragDepth to be redeclared - * with a layout qualifier. - */ -enum ir_depth_layout { - ir_depth_layout_none, /**< No depth layout is specified. */ - ir_depth_layout_any, - ir_depth_layout_greater, - ir_depth_layout_less, - ir_depth_layout_unchanged -}; - -/** - * \brief Convert depth layout qualifier to string. - */ -const char* -depth_layout_string(ir_depth_layout layout); - -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; - - /** - * Has this variable been used for reading or writing? - * - * Several GLSL semantic checks require knowledge of whether or not a - * variable has been used. For example, it is an error to redeclare a - * variable as invariant after it has been used. - */ - unsigned used: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; - /*@}*/ - - /** - * \brief Layout qualifier for gl_FragDepth. - * - * This is not equal to \c ir_depth_layout_none if and only if this - * variable is \c gl_FragDepth and a layout qualifier is specified. - */ - ir_depth_layout depth_layout; - - /** - * 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 ralloc 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 (0 or an expression) - * | Projection divisor - * | | Shadow comparitor - * | | | - * v v v - * (tex <sampler> <coordinate> 0 1 ( )) - * (txb <sampler> <coordinate> 0 1 ( ) <bias>) - * (txl <sampler> <coordinate> 0 1 ( ) <lod>) - * (txd <sampler> <coordinate> 0 1 ( ) (dPdx dPdy)) - * (txf <sampler> <coordinate> 0 <lod>) - */ -class ir_texture : public ir_rvalue { -public: - ir_texture(enum ir_texture_opcode op) - : op(op), projector(NULL), shadow_comparitor(NULL), offset(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; - - /** Texel offset. */ - ir_rvalue *offset; - - 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(_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 <stdio.h>
+#include <stdlib.h>
+
+#include "ralloc.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_const_in, /**< "in" param that must be a constant expression */
+ ir_var_system_value, /**< Ex: front-face, instance-id, etc. */
+ ir_var_temporary /**< Temporary variable generated during compilation. */
+};
+
+enum ir_variable_interpolation {
+ ir_var_smooth = 0,
+ ir_var_flat,
+ ir_var_noperspective
+};
+
+/**
+ * \brief Layout qualifiers for gl_FragDepth.
+ *
+ * The AMD_conservative_depth extension allows gl_FragDepth to be redeclared
+ * with a layout qualifier.
+ */
+enum ir_depth_layout {
+ ir_depth_layout_none, /**< No depth layout is specified. */
+ ir_depth_layout_any,
+ ir_depth_layout_greater,
+ ir_depth_layout_less,
+ ir_depth_layout_unchanged
+};
+
+/**
+ * \brief Convert depth layout qualifier to string.
+ */
+const char*
+depth_layout_string(ir_depth_layout layout);
+
+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;
+
+ /**
+ * Has this variable been used for reading or writing?
+ *
+ * Several GLSL semantic checks require knowledge of whether or not a
+ * variable has been used. For example, it is an error to redeclare a
+ * variable as invariant after it has been used.
+ */
+ unsigned used: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;
+ /*@}*/
+
+ /**
+ * \brief Layout qualifier for gl_FragDepth.
+ *
+ * This is not equal to \c ir_depth_layout_none if and only if this
+ * variable is \c gl_FragDepth and a layout qualifier is specified.
+ */
+ ir_depth_layout depth_layout;
+
+ /**
+ * 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 ralloc 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 (0 or an expression)
+ * | Projection divisor
+ * | | Shadow comparitor
+ * | | |
+ * v v v
+ * (tex <sampler> <coordinate> 0 1 ( ))
+ * (txb <sampler> <coordinate> 0 1 ( ) <bias>)
+ * (txl <sampler> <coordinate> 0 1 ( ) <lod>)
+ * (txd <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
+ * (txf <sampler> <coordinate> 0 <lod>)
+ */
+class ir_texture : public ir_rvalue {
+public:
+ ir_texture(enum ir_texture_opcode op)
+ : op(op), projector(NULL), shadow_comparitor(NULL), offset(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;
+
+ /** Texel offset. */
+ ir_rvalue *offset;
+
+ 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(_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 */
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