3 * Copyright © 2010 Intel Corporation
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
37 #include "ir_visitor.h"
38 #include "ir_hierarchical_visitor.h"
41 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
50 ir_type_dereference_array
,
51 ir_type_dereference_record
,
52 ir_type_dereference_variable
,
56 ir_type_function_signature
,
63 ir_type_max
/**< maximum ir_type enum number, for validation */
67 * Base class of all IR instructions
69 class ir_instruction
: public exec_node
{
71 enum ir_node_type ir_type
;
72 const struct glsl_type
*type
;
74 /** ir_print_visitor helper for debugging. */
75 void print(void) const;
77 virtual void accept(ir_visitor
*) = 0;
78 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
79 virtual ir_instruction
*clone(void *mem_ctx
,
80 struct hash_table
*ht
) const = 0;
83 * \name IR instruction downcast functions
85 * These functions either cast the object to a derived class or return
86 * \c NULL if the object's type does not match the specified derived class.
87 * Additional downcast functions will be added as needed.
90 virtual class ir_variable
* as_variable() { return NULL
; }
91 virtual class ir_function
* as_function() { return NULL
; }
92 virtual class ir_dereference
* as_dereference() { return NULL
; }
93 virtual class ir_dereference_array
* as_dereference_array() { return NULL
; }
94 virtual class ir_dereference_variable
*as_dereference_variable() { return NULL
; }
95 virtual class ir_expression
* as_expression() { return NULL
; }
96 virtual class ir_rvalue
* as_rvalue() { return NULL
; }
97 virtual class ir_loop
* as_loop() { return NULL
; }
98 virtual class ir_assignment
* as_assignment() { return NULL
; }
99 virtual class ir_call
* as_call() { return NULL
; }
100 virtual class ir_return
* as_return() { return NULL
; }
101 virtual class ir_if
* as_if() { return NULL
; }
102 virtual class ir_swizzle
* as_swizzle() { return NULL
; }
103 virtual class ir_constant
* as_constant() { return NULL
; }
109 ir_type
= ir_type_unset
;
115 class ir_rvalue
: public ir_instruction
{
117 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
119 virtual ir_constant
*constant_expression_value() = 0;
121 virtual ir_rvalue
* as_rvalue()
126 virtual bool is_lvalue()
132 * Get the variable that is ultimately referenced by an r-value
134 virtual ir_variable
*variable_referenced()
141 * If an r-value is a reference to a whole variable, get that variable
144 * Pointer to a variable that is completely dereferenced by the r-value. If
145 * the r-value is not a dereference or the dereference does not access the
146 * entire variable (i.e., it's just one array element, struct field), \c NULL
149 virtual ir_variable
*whole_variable_referenced()
159 enum ir_variable_mode
{
165 ir_var_temporary
/**< Temporary variable generated during compilation. */
168 enum ir_variable_interpolation
{
175 class ir_variable
: public ir_instruction
{
177 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
179 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
181 virtual ir_variable
*as_variable()
186 virtual void accept(ir_visitor
*v
)
191 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
195 * Get the string value for the interpolation qualifier
197 * \return The string that would be used in a shader to specify \c
198 * mode will be returned.
200 * This function should only be used on a shader input or output variable.
202 const char *interpolation_string() const;
205 * Calculate the number of slots required to hold this variable
207 * This is used to determine how many uniform or varying locations a variable
208 * occupies. The count is in units of floating point components.
210 unsigned component_slots() const;
215 * Highest element accessed with a constant expression array index
217 * Not used for non-array variables.
219 unsigned max_array_access
;
221 unsigned read_only
:1;
223 unsigned invariant
:1;
226 unsigned interpolation
:2;
229 * Flag that the whole array is assignable
231 * In GLSL 1.20 and later whole arrays are assignable (and comparable for
232 * equality). This flag enables this behavior.
234 unsigned array_lvalue
:1;
236 /* ARB_fragment_coord_conventions */
237 unsigned origin_upper_left
:1;
238 unsigned pixel_center_integer
:1;
241 * Storage location of the base of this variable
243 * The precise meaning of this field depends on the nature of the variable.
245 * - Vertex shader input: one of the values from \c gl_vert_attrib.
246 * - Vertex shader output: one of the values from \c gl_vert_result.
247 * - Fragment shader input: one of the values from \c gl_frag_attrib.
248 * - Fragment shader output: one of the values from \c gl_frag_result.
249 * - Uniforms: Per-stage uniform slot number.
250 * - Other: This field is not currently used.
252 * If the variable is a uniform, shader input, or shader output, and the
253 * slot has not been assigned, the value will be -1.
258 * Emit a warning if this variable is accessed.
260 const char *warn_extension
;
263 * Value assigned in the initializer of a variable declared "const"
265 ir_constant
*constant_value
;
271 * The representation of a function instance; may be the full definition or
272 * simply a prototype.
274 class ir_function_signature
: public ir_instruction
{
275 /* An ir_function_signature will be part of the list of signatures in
279 ir_function_signature(const glsl_type
*return_type
);
281 virtual ir_function_signature
*clone(void *mem_ctx
,
282 struct hash_table
*ht
) const;
284 virtual void accept(ir_visitor
*v
)
289 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
292 * Get the name of the function for which this is a signature
294 const char *function_name() const;
297 * Get a handle to the function for which this is a signature
299 * There is no setter function, this function returns a \c const pointer,
300 * and \c ir_function_signature::_function is private for a reason. The
301 * only way to make a connection between a function and function signature
302 * is via \c ir_function::add_signature. This helps ensure that certain
303 * invariants (i.e., a function signature is in the list of signatures for
304 * its \c _function) are met.
306 * \sa ir_function::add_signature
308 inline const class ir_function
*function() const
310 return this->_function
;
314 * Check whether the qualifiers match between this signature's parameters
315 * and the supplied parameter list. If not, returns the name of the first
316 * parameter with mismatched qualifiers (for use in error messages).
318 const char *qualifiers_match(exec_list
*params
);
321 * Replace the current parameter list with the given one. This is useful
322 * if the current information came from a prototype, and either has invalid
323 * or missing parameter names.
325 void replace_parameters(exec_list
*new_params
);
328 * Function return type.
330 * \note This discards the optional precision qualifier.
332 const struct glsl_type
*return_type
;
335 * List of ir_variable of function parameters.
337 * This represents the storage. The paramaters passed in a particular
338 * call will be in ir_call::actual_paramaters.
340 struct exec_list parameters
;
342 /** Whether or not this function has a body (which may be empty). */
343 unsigned is_defined
:1;
345 /** Whether or not this function signature is a built-in. */
346 unsigned is_builtin
:1;
348 /** Body of instructions in the function. */
349 struct exec_list body
;
352 /** Function of which this signature is one overload. */
353 class ir_function
*_function
;
355 friend class ir_function
;
360 * Header for tracking multiple overloaded functions with the same name.
361 * Contains a list of ir_function_signatures representing each of the
364 class ir_function
: public ir_instruction
{
366 ir_function(const char *name
);
368 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
370 virtual ir_function
*as_function()
375 virtual void accept(ir_visitor
*v
)
380 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
382 void add_signature(ir_function_signature
*sig
)
384 sig
->_function
= this;
385 this->signatures
.push_tail(sig
);
389 * Get an iterator for the set of function signatures
391 exec_list_iterator
iterator()
393 return signatures
.iterator();
397 * Find a signature that matches a set of actual parameters, taking implicit
398 * conversions into account.
400 ir_function_signature
*matching_signature(const exec_list
*actual_param
);
403 * Find a signature that exactly matches a set of actual parameters without
404 * any implicit type conversions.
406 ir_function_signature
*exact_matching_signature(const exec_list
*actual_ps
);
409 * Name of the function.
413 /** Whether or not this function has a signature that is a built-in. */
414 bool has_builtin_signature();
417 * List of ir_function_signature for each overloaded function with this name.
419 struct exec_list signatures
;
422 inline const char *ir_function_signature::function_name() const
424 return this->_function
->name
;
430 * IR instruction representing high-level if-statements
432 class ir_if
: public ir_instruction
{
434 ir_if(ir_rvalue
*condition
)
435 : condition(condition
)
437 ir_type
= ir_type_if
;
440 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
442 virtual ir_if
*as_if()
447 virtual void accept(ir_visitor
*v
)
452 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
454 ir_rvalue
*condition
;
455 /** List of ir_instruction for the body of the then branch */
456 exec_list then_instructions
;
457 /** List of ir_instruction for the body of the else branch */
458 exec_list else_instructions
;
463 * IR instruction representing a high-level loop structure.
465 class ir_loop
: public ir_instruction
{
469 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
471 virtual void accept(ir_visitor
*v
)
476 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
478 virtual ir_loop
*as_loop()
484 * Get an iterator for the instructions of the loop body
486 exec_list_iterator
iterator()
488 return body_instructions
.iterator();
491 /** List of ir_instruction that make up the body of the loop. */
492 exec_list body_instructions
;
495 * \name Loop counter and controls
497 * Represents a loop like a FORTRAN \c do-loop.
500 * If \c from and \c to are the same value, the loop will execute once.
503 ir_rvalue
*from
; /** Value of the loop counter on the first
504 * iteration of the loop.
506 ir_rvalue
*to
; /** Value of the loop counter on the last
507 * iteration of the loop.
509 ir_rvalue
*increment
;
510 ir_variable
*counter
;
513 * Comparison operation in the loop terminator.
515 * If any of the loop control fields are non-\c NULL, this field must be
516 * one of \c ir_binop_less, \c ir_binop_greater, \c ir_binop_lequal,
517 * \c ir_binop_gequal, \c ir_binop_equal, or \c ir_binop_nequal.
524 class ir_assignment
: public ir_instruction
{
526 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
);
529 * Construct an assignment with an explicit write mask
532 * Since a write mask is supplied, the LHS must already be a bare
533 * \c ir_dereference. The cannot be any swizzles in the LHS.
535 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
536 unsigned write_mask
);
538 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
540 virtual ir_constant
*constant_expression_value();
542 virtual void accept(ir_visitor
*v
)
547 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
549 virtual ir_assignment
* as_assignment()
555 * Get a whole variable written by an assignment
557 * If the LHS of the assignment writes a whole variable, the variable is
558 * returned. Otherwise \c NULL is returned. Examples of whole-variable
561 * - Assigning to a scalar
562 * - Assigning to all components of a vector
563 * - Whole array (or matrix) assignment
564 * - Whole structure assignment
566 ir_variable
*whole_variable_written();
569 * Set the LHS of an assignment
571 void set_lhs(ir_rvalue
*lhs
);
574 * Left-hand side of the assignment.
576 * This should be treated as read only. If you need to set the LHS of an
577 * assignment, use \c ir_assignment::set_lhs.
582 * Value being assigned
587 * Optional condition for the assignment.
589 ir_rvalue
*condition
;
593 * Component mask written
595 * For non-vector types in the LHS, this field will be zero. For vector
596 * types, a bit will be set for each component that is written. Note that
597 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
599 unsigned write_mask
:4;
602 /* Update ir_expression::num_operands() and operator_strs when
603 * updating this list.
605 enum ir_expression_operation
{
614 ir_unop_exp
, /**< Log base e on gentype */
615 ir_unop_log
, /**< Natural log on gentype */
618 ir_unop_f2i
, /**< Float-to-integer conversion. */
619 ir_unop_i2f
, /**< Integer-to-float conversion. */
620 ir_unop_f2b
, /**< Float-to-boolean conversion */
621 ir_unop_b2f
, /**< Boolean-to-float conversion */
622 ir_unop_i2b
, /**< int-to-boolean conversion */
623 ir_unop_b2i
, /**< Boolean-to-int conversion */
624 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
628 * \name Unary floating-point rounding operations.
638 * \name Trigonometric operations.
646 * \name Partial derivatives.
661 * Takes one of two combinations of arguments:
666 * Does not take integer types.
671 * \name Binary comparison operators
681 * Returns single boolean for whether all components of operands[0]
682 * equal the components of operands[1].
686 * Returns single boolean for whether any component of operands[0]
687 * is not equal to the corresponding component of operands[1].
693 * \name Bit-wise binary operations.
715 class ir_expression
: public ir_rvalue
{
717 ir_expression(int op
, const struct glsl_type
*type
,
718 ir_rvalue
*, ir_rvalue
*);
720 virtual ir_expression
*as_expression()
725 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
727 virtual ir_constant
*constant_expression_value();
729 static unsigned int get_num_operands(ir_expression_operation
);
730 unsigned int get_num_operands() const
732 return get_num_operands(operation
);
736 * Return a string representing this expression's operator.
738 const char *operator_string();
741 * Return a string representing this expression's operator.
743 static const char *operator_string(ir_expression_operation
);
747 * Do a reverse-lookup to translate the given string into an operator.
749 static ir_expression_operation
get_operator(const char *);
751 virtual void accept(ir_visitor
*v
)
756 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
758 ir_expression_operation operation
;
759 ir_rvalue
*operands
[2];
764 * IR instruction representing a function call
766 class ir_call
: public ir_rvalue
{
768 ir_call(ir_function_signature
*callee
, exec_list
*actual_parameters
)
771 ir_type
= ir_type_call
;
772 assert(callee
->return_type
!= NULL
);
773 type
= callee
->return_type
;
774 actual_parameters
->move_nodes_to(& this->actual_parameters
);
777 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
779 virtual ir_constant
*constant_expression_value();
781 virtual ir_call
*as_call()
786 virtual void accept(ir_visitor
*v
)
791 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
794 * Get a generic ir_call object when an error occurs
796 * Any allocation will be performed with 'ctx' as talloc owner.
798 static ir_call
*get_error_instruction(void *ctx
);
801 * Get an iterator for the set of acutal parameters
803 exec_list_iterator
iterator()
805 return actual_parameters
.iterator();
809 * Get the name of the function being called.
811 const char *callee_name() const
813 return callee
->function_name();
816 ir_function_signature
*get_callee()
822 * Set the function call target
824 void set_callee(ir_function_signature
*sig
);
827 * Generates an inline version of the function before @ir,
828 * returning the return value of the function.
830 ir_rvalue
*generate_inline(ir_instruction
*ir
);
832 /* List of ir_rvalue of paramaters passed in this call. */
833 exec_list actual_parameters
;
839 this->ir_type
= ir_type_call
;
842 ir_function_signature
*callee
;
847 * \name Jump-like IR instructions.
849 * These include \c break, \c continue, \c return, and \c discard.
852 class ir_jump
: public ir_instruction
{
856 ir_type
= ir_type_unset
;
860 class ir_return
: public ir_jump
{
865 this->ir_type
= ir_type_return
;
868 ir_return(ir_rvalue
*value
)
871 this->ir_type
= ir_type_return
;
874 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
876 virtual ir_return
*as_return()
881 ir_rvalue
*get_value() const
886 virtual void accept(ir_visitor
*v
)
891 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
898 * Jump instructions used inside loops
900 * These include \c break and \c continue. The \c break within a loop is
901 * different from the \c break within a switch-statement.
905 class ir_loop_jump
: public ir_jump
{
912 ir_loop_jump(jump_mode mode
)
914 this->ir_type
= ir_type_loop_jump
;
919 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
921 virtual void accept(ir_visitor
*v
)
926 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
928 bool is_break() const
930 return mode
== jump_break
;
933 bool is_continue() const
935 return mode
== jump_continue
;
938 /** Mode selector for the jump instruction. */
941 /** Loop containing this break instruction. */
946 * IR instruction representing discard statements.
948 class ir_discard
: public ir_jump
{
952 this->ir_type
= ir_type_discard
;
953 this->condition
= NULL
;
956 ir_discard(ir_rvalue
*cond
)
958 this->ir_type
= ir_type_discard
;
959 this->condition
= cond
;
962 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
964 virtual void accept(ir_visitor
*v
)
969 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
971 ir_rvalue
*condition
;
977 * Texture sampling opcodes used in ir_texture
979 enum ir_texture_opcode
{
980 ir_tex
, /* Regular texture look-up */
981 ir_txb
, /* Texture look-up with LOD bias */
982 ir_txl
, /* Texture look-up with explicit LOD */
983 ir_txd
, /* Texture look-up with partial derivatvies */
984 ir_txf
/* Texel fetch with explicit LOD */
989 * IR instruction to sample a texture
991 * The specific form of the IR instruction depends on the \c mode value
992 * selected from \c ir_texture_opcodes. In the printed IR, these will
996 * | Projection divisor
997 * | | Shadow comparitor
1000 * (tex (sampler) (coordinate) (0 0 0) (1) ( ))
1001 * (txb (sampler) (coordinate) (0 0 0) (1) ( ) (bias))
1002 * (txl (sampler) (coordinate) (0 0 0) (1) ( ) (lod))
1003 * (txd (sampler) (coordinate) (0 0 0) (1) ( ) (dPdx dPdy))
1004 * (txf (sampler) (coordinate) (0 0 0) (lod))
1006 class ir_texture
: public ir_rvalue
{
1008 ir_texture(enum ir_texture_opcode op
)
1009 : op(op
), projector(NULL
), shadow_comparitor(NULL
)
1011 this->ir_type
= ir_type_texture
;
1014 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1016 virtual ir_constant
*constant_expression_value();
1018 virtual void accept(ir_visitor
*v
)
1023 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1026 * Return a string representing the ir_texture_opcode.
1028 const char *opcode_string();
1030 /** Set the sampler and infer the type. */
1031 void set_sampler(ir_dereference
*sampler
);
1034 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1036 static ir_texture_opcode
get_opcode(const char *);
1038 enum ir_texture_opcode op
;
1040 /** Sampler to use for the texture access. */
1041 ir_dereference
*sampler
;
1043 /** Texture coordinate to sample */
1044 ir_rvalue
*coordinate
;
1047 * Value used for projective divide.
1049 * If there is no projective divide (the common case), this will be
1050 * \c NULL. Optimization passes should check for this to point to a constant
1051 * of 1.0 and replace that with \c NULL.
1053 ir_rvalue
*projector
;
1056 * Coordinate used for comparison on shadow look-ups.
1058 * If there is no shadow comparison, this will be \c NULL. For the
1059 * \c ir_txf opcode, this *must* be \c NULL.
1061 ir_rvalue
*shadow_comparitor
;
1063 /** Explicit texel offsets. */
1064 signed char offsets
[3];
1067 ir_rvalue
*lod
; /**< Floating point LOD */
1068 ir_rvalue
*bias
; /**< Floating point LOD bias */
1070 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1071 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1077 struct ir_swizzle_mask
{
1084 * Number of components in the swizzle.
1086 unsigned num_components
:3;
1089 * Does the swizzle contain duplicate components?
1091 * L-value swizzles cannot contain duplicate components.
1093 unsigned has_duplicates
:1;
1097 class ir_swizzle
: public ir_rvalue
{
1099 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1102 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1104 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1106 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1108 virtual ir_constant
*constant_expression_value();
1110 virtual ir_swizzle
*as_swizzle()
1116 * Construct an ir_swizzle from the textual representation. Can fail.
1118 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1120 virtual void accept(ir_visitor
*v
)
1125 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1129 return val
->is_lvalue() && !mask
.has_duplicates
;
1133 * Get the variable that is ultimately referenced by an r-value
1135 virtual ir_variable
*variable_referenced();
1138 ir_swizzle_mask mask
;
1142 * Initialize the mask component of a swizzle
1144 * This is used by the \c ir_swizzle constructors.
1146 void init_mask(const unsigned *components
, unsigned count
);
1150 class ir_dereference
: public ir_rvalue
{
1152 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1154 virtual ir_dereference
*as_dereference()
1162 * Get the variable that is ultimately referenced by an r-value
1164 virtual ir_variable
*variable_referenced() = 0;
1168 class ir_dereference_variable
: public ir_dereference
{
1170 ir_dereference_variable(ir_variable
*var
);
1172 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1173 struct hash_table
*) const;
1175 virtual ir_constant
*constant_expression_value();
1177 virtual ir_dereference_variable
*as_dereference_variable()
1183 * Get the variable that is ultimately referenced by an r-value
1185 virtual ir_variable
*variable_referenced()
1190 virtual ir_variable
*whole_variable_referenced()
1192 /* ir_dereference_variable objects always dereference the entire
1193 * variable. However, if this dereference is dereferenced by anything
1194 * else, the complete deferefernce chain is not a whole-variable
1195 * dereference. This method should only be called on the top most
1196 * ir_rvalue in a dereference chain.
1201 virtual void accept(ir_visitor
*v
)
1206 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1209 * Object being dereferenced.
1215 class ir_dereference_array
: public ir_dereference
{
1217 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1219 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1221 virtual ir_dereference_array
*clone(void *mem_ctx
,
1222 struct hash_table
*) const;
1224 virtual ir_constant
*constant_expression_value();
1226 virtual ir_dereference_array
*as_dereference_array()
1232 * Get the variable that is ultimately referenced by an r-value
1234 virtual ir_variable
*variable_referenced()
1236 return this->array
->variable_referenced();
1239 virtual void accept(ir_visitor
*v
)
1244 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1247 ir_rvalue
*array_index
;
1250 void set_array(ir_rvalue
*value
);
1254 class ir_dereference_record
: public ir_dereference
{
1256 ir_dereference_record(ir_rvalue
*value
, const char *field
);
1258 ir_dereference_record(ir_variable
*var
, const char *field
);
1260 virtual ir_dereference_record
*clone(void *mem_ctx
,
1261 struct hash_table
*) const;
1263 virtual ir_constant
*constant_expression_value();
1266 * Get the variable that is ultimately referenced by an r-value
1268 virtual ir_variable
*variable_referenced()
1270 return this->record
->variable_referenced();
1273 virtual void accept(ir_visitor
*v
)
1278 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1286 * Data stored in an ir_constant
1288 union ir_constant_data
{
1296 class ir_constant
: public ir_rvalue
{
1298 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
1299 ir_constant(bool b
);
1300 ir_constant(unsigned int u
);
1302 ir_constant(float f
);
1305 * Construct an ir_constant from a list of ir_constant values
1307 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
1310 * Construct an ir_constant from a scalar component of another ir_constant
1312 * The new \c ir_constant inherits the type of the component from the
1316 * In the case of a matrix constant, the new constant is a scalar, \b not
1319 ir_constant(const ir_constant
*c
, unsigned i
);
1322 * Return a new ir_constant of the specified type containing all zeros.
1324 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
1326 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
1328 virtual ir_constant
*constant_expression_value();
1330 virtual ir_constant
*as_constant()
1335 virtual void accept(ir_visitor
*v
)
1340 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1343 * Get a particular component of a constant as a specific type
1345 * This is useful, for example, to get a value from an integer constant
1346 * as a float or bool. This appears frequently when constructors are
1347 * called with all constant parameters.
1350 bool get_bool_component(unsigned i
) const;
1351 float get_float_component(unsigned i
) const;
1352 int get_int_component(unsigned i
) const;
1353 unsigned get_uint_component(unsigned i
) const;
1356 ir_constant
*get_array_element(unsigned i
) const;
1358 ir_constant
*get_record_field(const char *name
);
1361 * Determine whether a constant has the same value as another constant
1363 bool has_value(const ir_constant
*) const;
1366 * Value of the constant.
1368 * The field used to back the values supplied by the constant is determined
1369 * by the type associated with the \c ir_instruction. Constants may be
1370 * scalars, vectors, or matrices.
1372 union ir_constant_data value
;
1374 /* Array elements */
1375 ir_constant
**array_elements
;
1377 /* Structure fields */
1378 exec_list components
;
1382 * Parameterless constructor only used by the clone method
1388 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
1390 void validate_ir_tree(exec_list
*instructions
);
1393 * Make a clone of each IR instruction in a list
1395 * \param in List of IR instructions that are to be cloned
1396 * \param out List to hold the cloned instructions
1399 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
1402 _mesa_glsl_initialize_variables(exec_list
*instructions
,
1403 struct _mesa_glsl_parse_state
*state
);
1406 _mesa_glsl_initialize_functions(exec_list
*instructions
,
1407 struct _mesa_glsl_parse_state
*state
);
1410 _mesa_glsl_release_functions(void);
1413 reparent_ir(exec_list
*list
, void *mem_ctx
);
1415 struct glsl_symbol_table
;
1418 import_prototypes(const exec_list
*source
, exec_list
*dest
,
1419 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
1422 ir_has_call(ir_instruction
*ir
);
1425 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
);