mesa git update 30 Mar 2011

1 files changed, 1666 insertions, 1640 deletions

diff --git a/mesalib/src/glsl/ir.h b/mesalib/src/glsl/ir.h
index 72e3e35c4..a41984310 100644
--- a/mesalib/src/glsl/ir.h
+++ b/mesalib/src/glsl/ir.h
@@ -1,1640 +1,1666 @@
-/* -*- 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 <type> <sampler> <coordinate> 0 1 ( ))

- * (txb <type> <sampler> <coordinate> 0 1 ( ) <bias>)

- * (txl <type> <sampler> <coordinate> 0 1 ( ) <lod>)

- * (txd <type> <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))

- * (txf <type> <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 type. */

-   void set_sampler(ir_dereference *sampler, const glsl_type *type);

-

-   /**

-    * 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);
+
+/**
+ * Description of built-in state associated with a uniform
+ *
+ * \sa ir_variable::state_slots
+ */
+struct ir_state_slot {
+   int tokens[5];
+   int swizzle;
+};
+
+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;
+
+   /**
+    * Built-in state that backs this uniform
+    *
+    * Once set at variable creation, \c state_slots must remain invariant.
+    * This is because, ideally, this array would be shared by all clones of
+    * this variable in the IR tree.  In other words, we'd really like for it
+    * to be a fly-weight.
+    *
+    * If the variable is not a uniform, \c num_state_slots will be zero and
+    * \c state_slots will be \c NULL.
+    */
+   /*@{*/
+   unsigned num_state_slots;    /**< Number of state slots used */
+   ir_state_slot *state_slots;  /**< State descriptors. */
+   /*@}*/
+
+   /**
+    * 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 <type> <sampler> <coordinate> 0 1 ( ))
+ * (txb <type> <sampler> <coordinate> 0 1 ( ) <bias>)
+ * (txl <type> <sampler> <coordinate> 0 1 ( ) <lod>)
+ * (txd <type> <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
+ * (txf <type> <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 type. */
+   void set_sampler(ir_dereference *sampler, const glsl_type *type);
+
+   /**
+    * 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 */