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37 #include "ir_visitor.h"
38 #include "ir_hierarchical_visitor.h"
41 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
45 * \defgroup IR Intermediate representation nodes
53 * Each concrete class derived from \c ir_instruction has a value in this
54 * enumerant. The value for the type is stored in \c ir_instruction::ir_type
55 * by the constructor. While using type tags is not very C++, it is extremely
56 * convenient. For example, during debugging you can simply inspect
57 * \c ir_instruction::ir_type to find out the actual type of the object.
59 * In addition, it is possible to use a switch-statement based on \c
60 * \c ir_instruction::ir_type to select different behavior for different object
61 * types. For functions that have only slight differences for several object
62 * types, this allows writing very straightforward, readable code.
66 * Zero is unused so that the IR validator can detect cases where
67 * \c ir_instruction::ir_type has not been initialized.
74 ir_type_dereference_array
,
75 ir_type_dereference_record
,
76 ir_type_dereference_variable
,
80 ir_type_function_signature
,
87 ir_type_max
/**< maximum ir_type enum number, for validation */
91 * Base class of all IR instructions
93 class ir_instruction
: public exec_node
{
95 enum ir_node_type ir_type
;
96 const struct glsl_type
*type
;
98 /** ir_print_visitor helper for debugging. */
99 void print(void) const;
101 virtual void accept(ir_visitor
*) = 0;
102 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
103 virtual ir_instruction
*clone(void *mem_ctx
,
104 struct hash_table
*ht
) const = 0;
107 * \name IR instruction downcast functions
109 * These functions either cast the object to a derived class or return
110 * \c NULL if the object's type does not match the specified derived class.
111 * Additional downcast functions will be added as needed.
114 virtual class ir_variable
* as_variable() { return NULL
; }
115 virtual class ir_function
* as_function() { return NULL
; }
116 virtual class ir_dereference
* as_dereference() { return NULL
; }
117 virtual class ir_dereference_array
* as_dereference_array() { return NULL
; }
118 virtual class ir_dereference_variable
*as_dereference_variable() { return NULL
; }
119 virtual class ir_expression
* as_expression() { return NULL
; }
120 virtual class ir_rvalue
* as_rvalue() { return NULL
; }
121 virtual class ir_loop
* as_loop() { return NULL
; }
122 virtual class ir_assignment
* as_assignment() { return NULL
; }
123 virtual class ir_call
* as_call() { return NULL
; }
124 virtual class ir_return
* as_return() { return NULL
; }
125 virtual class ir_if
* as_if() { return NULL
; }
126 virtual class ir_swizzle
* as_swizzle() { return NULL
; }
127 virtual class ir_constant
* as_constant() { return NULL
; }
133 ir_type
= ir_type_unset
;
139 class ir_rvalue
: public ir_instruction
{
141 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
143 virtual ir_constant
*constant_expression_value() = 0;
145 virtual ir_rvalue
* as_rvalue()
150 virtual bool is_lvalue()
156 * Get the variable that is ultimately referenced by an r-value
158 virtual ir_variable
*variable_referenced()
165 * If an r-value is a reference to a whole variable, get that variable
168 * Pointer to a variable that is completely dereferenced by the r-value. If
169 * the r-value is not a dereference or the dereference does not access the
170 * entire variable (i.e., it's just one array element, struct field), \c NULL
173 virtual ir_variable
*whole_variable_referenced()
184 * Variable storage classes
186 enum ir_variable_mode
{
187 ir_var_auto
= 0, /**< Function local variables and globals. */
188 ir_var_uniform
, /**< Variable declared as a uniform. */
192 ir_var_temporary
/**< Temporary variable generated during compilation. */
195 enum ir_variable_interpolation
{
202 class ir_variable
: public ir_instruction
{
204 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
206 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
208 virtual ir_variable
*as_variable()
213 virtual void accept(ir_visitor
*v
)
218 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
222 * Get the string value for the interpolation qualifier
224 * \return The string that would be used in a shader to specify \c
225 * mode will be returned.
227 * This function should only be used on a shader input or output variable.
229 const char *interpolation_string() const;
232 * Calculate the number of slots required to hold this variable
234 * This is used to determine how many uniform or varying locations a variable
235 * occupies. The count is in units of floating point components.
237 unsigned component_slots() const;
240 * Delcared name of the variable
245 * Highest element accessed with a constant expression array index
247 * Not used for non-array variables.
249 unsigned max_array_access
;
252 * Is the variable read-only?
254 * This is set for variables declared as \c const, shader inputs,
257 unsigned read_only
:1;
259 unsigned invariant
:1;
262 * Storage class of the variable.
264 * \sa ir_variable_mode
269 * Interpolation mode for shader inputs / outputs
271 * \sa ir_variable_interpolation
273 unsigned interpolation
:2;
276 * Flag that the whole array is assignable
278 * In GLSL 1.20 and later whole arrays are assignable (and comparable for
279 * equality). This flag enables this behavior.
281 unsigned array_lvalue
:1;
284 * \name ARB_fragment_coord_conventions
287 unsigned origin_upper_left
:1;
288 unsigned pixel_center_integer
:1;
292 * Storage location of the base of this variable
294 * The precise meaning of this field depends on the nature of the variable.
296 * - Vertex shader input: one of the values from \c gl_vert_attrib.
297 * - Vertex shader output: one of the values from \c gl_vert_result.
298 * - Fragment shader input: one of the values from \c gl_frag_attrib.
299 * - Fragment shader output: one of the values from \c gl_frag_result.
300 * - Uniforms: Per-stage uniform slot number.
301 * - Other: This field is not currently used.
303 * If the variable is a uniform, shader input, or shader output, and the
304 * slot has not been assigned, the value will be -1.
309 * Emit a warning if this variable is accessed.
311 const char *warn_extension
;
314 * Value assigned in the initializer of a variable declared "const"
316 ir_constant
*constant_value
;
322 * The representation of a function instance; may be the full definition or
323 * simply a prototype.
325 class ir_function_signature
: public ir_instruction
{
326 /* An ir_function_signature will be part of the list of signatures in
330 ir_function_signature(const glsl_type
*return_type
);
332 virtual ir_function_signature
*clone(void *mem_ctx
,
333 struct hash_table
*ht
) const;
335 virtual void accept(ir_visitor
*v
)
340 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
343 * Get the name of the function for which this is a signature
345 const char *function_name() const;
348 * Get a handle to the function for which this is a signature
350 * There is no setter function, this function returns a \c const pointer,
351 * and \c ir_function_signature::_function is private for a reason. The
352 * only way to make a connection between a function and function signature
353 * is via \c ir_function::add_signature. This helps ensure that certain
354 * invariants (i.e., a function signature is in the list of signatures for
355 * its \c _function) are met.
357 * \sa ir_function::add_signature
359 inline const class ir_function
*function() const
361 return this->_function
;
365 * Check whether the qualifiers match between this signature's parameters
366 * and the supplied parameter list. If not, returns the name of the first
367 * parameter with mismatched qualifiers (for use in error messages).
369 const char *qualifiers_match(exec_list
*params
);
372 * Replace the current parameter list with the given one. This is useful
373 * if the current information came from a prototype, and either has invalid
374 * or missing parameter names.
376 void replace_parameters(exec_list
*new_params
);
379 * Function return type.
381 * \note This discards the optional precision qualifier.
383 const struct glsl_type
*return_type
;
386 * List of ir_variable of function parameters.
388 * This represents the storage. The paramaters passed in a particular
389 * call will be in ir_call::actual_paramaters.
391 struct exec_list parameters
;
393 /** Whether or not this function has a body (which may be empty). */
394 unsigned is_defined
:1;
396 /** Whether or not this function signature is a built-in. */
397 unsigned is_builtin
:1;
399 /** Body of instructions in the function. */
400 struct exec_list body
;
403 /** Function of which this signature is one overload. */
404 class ir_function
*_function
;
406 friend class ir_function
;
411 * Header for tracking multiple overloaded functions with the same name.
412 * Contains a list of ir_function_signatures representing each of the
415 class ir_function
: public ir_instruction
{
417 ir_function(const char *name
);
419 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
421 virtual ir_function
*as_function()
426 virtual void accept(ir_visitor
*v
)
431 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
433 void add_signature(ir_function_signature
*sig
)
435 sig
->_function
= this;
436 this->signatures
.push_tail(sig
);
440 * Get an iterator for the set of function signatures
442 exec_list_iterator
iterator()
444 return signatures
.iterator();
448 * Find a signature that matches a set of actual parameters, taking implicit
449 * conversions into account.
451 ir_function_signature
*matching_signature(const exec_list
*actual_param
);
454 * Find a signature that exactly matches a set of actual parameters without
455 * any implicit type conversions.
457 ir_function_signature
*exact_matching_signature(const exec_list
*actual_ps
);
460 * Name of the function.
464 /** Whether or not this function has a signature that isn't a built-in. */
465 bool has_user_signature();
468 * List of ir_function_signature for each overloaded function with this name.
470 struct exec_list signatures
;
473 inline const char *ir_function_signature::function_name() const
475 return this->_function
->name
;
481 * IR instruction representing high-level if-statements
483 class ir_if
: public ir_instruction
{
485 ir_if(ir_rvalue
*condition
)
486 : condition(condition
)
488 ir_type
= ir_type_if
;
491 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
493 virtual ir_if
*as_if()
498 virtual void accept(ir_visitor
*v
)
503 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
505 ir_rvalue
*condition
;
506 /** List of ir_instruction for the body of the then branch */
507 exec_list then_instructions
;
508 /** List of ir_instruction for the body of the else branch */
509 exec_list else_instructions
;
514 * IR instruction representing a high-level loop structure.
516 class ir_loop
: public ir_instruction
{
520 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
522 virtual void accept(ir_visitor
*v
)
527 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
529 virtual ir_loop
*as_loop()
535 * Get an iterator for the instructions of the loop body
537 exec_list_iterator
iterator()
539 return body_instructions
.iterator();
542 /** List of ir_instruction that make up the body of the loop. */
543 exec_list body_instructions
;
546 * \name Loop counter and controls
548 * Represents a loop like a FORTRAN \c do-loop.
551 * If \c from and \c to are the same value, the loop will execute once.
554 ir_rvalue
*from
; /** Value of the loop counter on the first
555 * iteration of the loop.
557 ir_rvalue
*to
; /** Value of the loop counter on the last
558 * iteration of the loop.
560 ir_rvalue
*increment
;
561 ir_variable
*counter
;
564 * Comparison operation in the loop terminator.
566 * If any of the loop control fields are non-\c NULL, this field must be
567 * one of \c ir_binop_less, \c ir_binop_greater, \c ir_binop_lequal,
568 * \c ir_binop_gequal, \c ir_binop_equal, or \c ir_binop_nequal.
575 class ir_assignment
: public ir_instruction
{
577 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
);
580 * Construct an assignment with an explicit write mask
583 * Since a write mask is supplied, the LHS must already be a bare
584 * \c ir_dereference. The cannot be any swizzles in the LHS.
586 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
587 unsigned write_mask
);
589 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
591 virtual ir_constant
*constant_expression_value();
593 virtual void accept(ir_visitor
*v
)
598 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
600 virtual ir_assignment
* as_assignment()
606 * Get a whole variable written by an assignment
608 * If the LHS of the assignment writes a whole variable, the variable is
609 * returned. Otherwise \c NULL is returned. Examples of whole-variable
612 * - Assigning to a scalar
613 * - Assigning to all components of a vector
614 * - Whole array (or matrix) assignment
615 * - Whole structure assignment
617 ir_variable
*whole_variable_written();
620 * Set the LHS of an assignment
622 void set_lhs(ir_rvalue
*lhs
);
625 * Left-hand side of the assignment.
627 * This should be treated as read only. If you need to set the LHS of an
628 * assignment, use \c ir_assignment::set_lhs.
633 * Value being assigned
638 * Optional condition for the assignment.
640 ir_rvalue
*condition
;
644 * Component mask written
646 * For non-vector types in the LHS, this field will be zero. For vector
647 * types, a bit will be set for each component that is written. Note that
648 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
650 * A partially-set write mask means that each enabled channel gets
651 * the value from a consecutive channel of the rhs. For example,
652 * to write just .xyw of gl_FrontColor with color:
654 * (assign (constant bool (1)) (xyw)
655 * (var_ref gl_FragColor)
656 * (swiz xyw (var_ref color)))
658 unsigned write_mask
:4;
661 /* Update ir_expression::num_operands() and operator_strs when
662 * updating this list.
664 enum ir_expression_operation
{
673 ir_unop_exp
, /**< Log base e on gentype */
674 ir_unop_log
, /**< Natural log on gentype */
677 ir_unop_f2i
, /**< Float-to-integer conversion. */
678 ir_unop_i2f
, /**< Integer-to-float conversion. */
679 ir_unop_f2b
, /**< Float-to-boolean conversion */
680 ir_unop_b2f
, /**< Boolean-to-float conversion */
681 ir_unop_i2b
, /**< int-to-boolean conversion */
682 ir_unop_b2i
, /**< Boolean-to-int conversion */
683 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
687 * \name Unary floating-point rounding operations.
697 * \name Trigonometric operations.
705 * \name Partial derivatives.
720 * Takes one of two combinations of arguments:
725 * Does not take integer types.
730 * \name Binary comparison operators which return a boolean vector.
731 * The type of both operands must be equal.
741 * Returns single boolean for whether all components of operands[0]
742 * equal the components of operands[1].
746 * Returns single boolean for whether any component of operands[0]
747 * is not equal to the corresponding component of operands[1].
753 * \name Bit-wise binary operations.
775 class ir_expression
: public ir_rvalue
{
777 ir_expression(int op
, const struct glsl_type
*type
,
778 ir_rvalue
*, ir_rvalue
*);
780 virtual ir_expression
*as_expression()
785 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
788 * Attempt to constant-fold the expression
790 * If the expression cannot be constant folded, this method will return
793 virtual ir_constant
*constant_expression_value();
796 * Determine the number of operands used by an expression
798 static unsigned int get_num_operands(ir_expression_operation
);
801 * Determine the number of operands used by an expression
803 unsigned int get_num_operands() const
805 return get_num_operands(operation
);
809 * Return a string representing this expression's operator.
811 const char *operator_string();
814 * Return a string representing this expression's operator.
816 static const char *operator_string(ir_expression_operation
);
820 * Do a reverse-lookup to translate the given string into an operator.
822 static ir_expression_operation
get_operator(const char *);
824 virtual void accept(ir_visitor
*v
)
829 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
831 ir_expression_operation operation
;
832 ir_rvalue
*operands
[2];
837 * IR instruction representing a function call
839 class ir_call
: public ir_rvalue
{
841 ir_call(ir_function_signature
*callee
, exec_list
*actual_parameters
)
844 ir_type
= ir_type_call
;
845 assert(callee
->return_type
!= NULL
);
846 type
= callee
->return_type
;
847 actual_parameters
->move_nodes_to(& this->actual_parameters
);
850 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
852 virtual ir_constant
*constant_expression_value();
854 virtual ir_call
*as_call()
859 virtual void accept(ir_visitor
*v
)
864 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
867 * Get a generic ir_call object when an error occurs
869 * Any allocation will be performed with 'ctx' as talloc owner.
871 static ir_call
*get_error_instruction(void *ctx
);
874 * Get an iterator for the set of acutal parameters
876 exec_list_iterator
iterator()
878 return actual_parameters
.iterator();
882 * Get the name of the function being called.
884 const char *callee_name() const
886 return callee
->function_name();
890 * Get the function signature bound to this function call
892 ir_function_signature
*get_callee()
898 * Set the function call target
900 void set_callee(ir_function_signature
*sig
);
903 * Generates an inline version of the function before @ir,
904 * returning the return value of the function.
906 ir_rvalue
*generate_inline(ir_instruction
*ir
);
908 /* List of ir_rvalue of paramaters passed in this call. */
909 exec_list actual_parameters
;
915 this->ir_type
= ir_type_call
;
918 ir_function_signature
*callee
;
923 * \name Jump-like IR instructions.
925 * These include \c break, \c continue, \c return, and \c discard.
928 class ir_jump
: public ir_instruction
{
932 ir_type
= ir_type_unset
;
936 class ir_return
: public ir_jump
{
941 this->ir_type
= ir_type_return
;
944 ir_return(ir_rvalue
*value
)
947 this->ir_type
= ir_type_return
;
950 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
952 virtual ir_return
*as_return()
957 ir_rvalue
*get_value() const
962 virtual void accept(ir_visitor
*v
)
967 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
974 * Jump instructions used inside loops
976 * These include \c break and \c continue. The \c break within a loop is
977 * different from the \c break within a switch-statement.
981 class ir_loop_jump
: public ir_jump
{
988 ir_loop_jump(jump_mode mode
)
990 this->ir_type
= ir_type_loop_jump
;
995 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
997 virtual void accept(ir_visitor
*v
)
1002 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1004 bool is_break() const
1006 return mode
== jump_break
;
1009 bool is_continue() const
1011 return mode
== jump_continue
;
1014 /** Mode selector for the jump instruction. */
1015 enum jump_mode mode
;
1017 /** Loop containing this break instruction. */
1022 * IR instruction representing discard statements.
1024 class ir_discard
: public ir_jump
{
1028 this->ir_type
= ir_type_discard
;
1029 this->condition
= NULL
;
1032 ir_discard(ir_rvalue
*cond
)
1034 this->ir_type
= ir_type_discard
;
1035 this->condition
= cond
;
1038 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1040 virtual void accept(ir_visitor
*v
)
1045 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1047 ir_rvalue
*condition
;
1053 * Texture sampling opcodes used in ir_texture
1055 enum ir_texture_opcode
{
1056 ir_tex
, /**< Regular texture look-up */
1057 ir_txb
, /**< Texture look-up with LOD bias */
1058 ir_txl
, /**< Texture look-up with explicit LOD */
1059 ir_txd
, /**< Texture look-up with partial derivatvies */
1060 ir_txf
/**< Texel fetch with explicit LOD */
1065 * IR instruction to sample a texture
1067 * The specific form of the IR instruction depends on the \c mode value
1068 * selected from \c ir_texture_opcodes. In the printed IR, these will
1072 * | Projection divisor
1073 * | | Shadow comparitor
1076 * (tex (sampler) (coordinate) (0 0 0) (1) ( ))
1077 * (txb (sampler) (coordinate) (0 0 0) (1) ( ) (bias))
1078 * (txl (sampler) (coordinate) (0 0 0) (1) ( ) (lod))
1079 * (txd (sampler) (coordinate) (0 0 0) (1) ( ) (dPdx dPdy))
1080 * (txf (sampler) (coordinate) (0 0 0) (lod))
1082 class ir_texture
: public ir_rvalue
{
1084 ir_texture(enum ir_texture_opcode op
)
1085 : op(op
), projector(NULL
), shadow_comparitor(NULL
)
1087 this->ir_type
= ir_type_texture
;
1090 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1092 virtual ir_constant
*constant_expression_value();
1094 virtual void accept(ir_visitor
*v
)
1099 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1102 * Return a string representing the ir_texture_opcode.
1104 const char *opcode_string();
1106 /** Set the sampler and infer the type. */
1107 void set_sampler(ir_dereference
*sampler
);
1110 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1112 static ir_texture_opcode
get_opcode(const char *);
1114 enum ir_texture_opcode op
;
1116 /** Sampler to use for the texture access. */
1117 ir_dereference
*sampler
;
1119 /** Texture coordinate to sample */
1120 ir_rvalue
*coordinate
;
1123 * Value used for projective divide.
1125 * If there is no projective divide (the common case), this will be
1126 * \c NULL. Optimization passes should check for this to point to a constant
1127 * of 1.0 and replace that with \c NULL.
1129 ir_rvalue
*projector
;
1132 * Coordinate used for comparison on shadow look-ups.
1134 * If there is no shadow comparison, this will be \c NULL. For the
1135 * \c ir_txf opcode, this *must* be \c NULL.
1137 ir_rvalue
*shadow_comparitor
;
1139 /** Explicit texel offsets. */
1140 signed char offsets
[3];
1143 ir_rvalue
*lod
; /**< Floating point LOD */
1144 ir_rvalue
*bias
; /**< Floating point LOD bias */
1146 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1147 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1153 struct ir_swizzle_mask
{
1160 * Number of components in the swizzle.
1162 unsigned num_components
:3;
1165 * Does the swizzle contain duplicate components?
1167 * L-value swizzles cannot contain duplicate components.
1169 unsigned has_duplicates
:1;
1173 class ir_swizzle
: public ir_rvalue
{
1175 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1178 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1180 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1182 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1184 virtual ir_constant
*constant_expression_value();
1186 virtual ir_swizzle
*as_swizzle()
1192 * Construct an ir_swizzle from the textual representation. Can fail.
1194 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1196 virtual void accept(ir_visitor
*v
)
1201 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1205 return val
->is_lvalue() && !mask
.has_duplicates
;
1209 * Get the variable that is ultimately referenced by an r-value
1211 virtual ir_variable
*variable_referenced();
1214 ir_swizzle_mask mask
;
1218 * Initialize the mask component of a swizzle
1220 * This is used by the \c ir_swizzle constructors.
1222 void init_mask(const unsigned *components
, unsigned count
);
1226 class ir_dereference
: public ir_rvalue
{
1228 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1230 virtual ir_dereference
*as_dereference()
1238 * Get the variable that is ultimately referenced by an r-value
1240 virtual ir_variable
*variable_referenced() = 0;
1244 class ir_dereference_variable
: public ir_dereference
{
1246 ir_dereference_variable(ir_variable
*var
);
1248 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1249 struct hash_table
*) const;
1251 virtual ir_constant
*constant_expression_value();
1253 virtual ir_dereference_variable
*as_dereference_variable()
1259 * Get the variable that is ultimately referenced by an r-value
1261 virtual ir_variable
*variable_referenced()
1266 virtual ir_variable
*whole_variable_referenced()
1268 /* ir_dereference_variable objects always dereference the entire
1269 * variable. However, if this dereference is dereferenced by anything
1270 * else, the complete deferefernce chain is not a whole-variable
1271 * dereference. This method should only be called on the top most
1272 * ir_rvalue in a dereference chain.
1277 virtual void accept(ir_visitor
*v
)
1282 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1285 * Object being dereferenced.
1291 class ir_dereference_array
: public ir_dereference
{
1293 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1295 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1297 virtual ir_dereference_array
*clone(void *mem_ctx
,
1298 struct hash_table
*) const;
1300 virtual ir_constant
*constant_expression_value();
1302 virtual ir_dereference_array
*as_dereference_array()
1308 * Get the variable that is ultimately referenced by an r-value
1310 virtual ir_variable
*variable_referenced()
1312 return this->array
->variable_referenced();
1315 virtual void accept(ir_visitor
*v
)
1320 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1323 ir_rvalue
*array_index
;
1326 void set_array(ir_rvalue
*value
);
1330 class ir_dereference_record
: public ir_dereference
{
1332 ir_dereference_record(ir_rvalue
*value
, const char *field
);
1334 ir_dereference_record(ir_variable
*var
, const char *field
);
1336 virtual ir_dereference_record
*clone(void *mem_ctx
,
1337 struct hash_table
*) const;
1339 virtual ir_constant
*constant_expression_value();
1342 * Get the variable that is ultimately referenced by an r-value
1344 virtual ir_variable
*variable_referenced()
1346 return this->record
->variable_referenced();
1349 virtual void accept(ir_visitor
*v
)
1354 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1362 * Data stored in an ir_constant
1364 union ir_constant_data
{
1372 class ir_constant
: public ir_rvalue
{
1374 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
1375 ir_constant(bool b
);
1376 ir_constant(unsigned int u
);
1378 ir_constant(float f
);
1381 * Construct an ir_constant from a list of ir_constant values
1383 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
1386 * Construct an ir_constant from a scalar component of another ir_constant
1388 * The new \c ir_constant inherits the type of the component from the
1392 * In the case of a matrix constant, the new constant is a scalar, \b not
1395 ir_constant(const ir_constant
*c
, unsigned i
);
1398 * Return a new ir_constant of the specified type containing all zeros.
1400 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
1402 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
1404 virtual ir_constant
*constant_expression_value();
1406 virtual ir_constant
*as_constant()
1411 virtual void accept(ir_visitor
*v
)
1416 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1419 * Get a particular component of a constant as a specific type
1421 * This is useful, for example, to get a value from an integer constant
1422 * as a float or bool. This appears frequently when constructors are
1423 * called with all constant parameters.
1426 bool get_bool_component(unsigned i
) const;
1427 float get_float_component(unsigned i
) const;
1428 int get_int_component(unsigned i
) const;
1429 unsigned get_uint_component(unsigned i
) const;
1432 ir_constant
*get_array_element(unsigned i
) const;
1434 ir_constant
*get_record_field(const char *name
);
1437 * Determine whether a constant has the same value as another constant
1439 bool has_value(const ir_constant
*) const;
1442 * Value of the constant.
1444 * The field used to back the values supplied by the constant is determined
1445 * by the type associated with the \c ir_instruction. Constants may be
1446 * scalars, vectors, or matrices.
1448 union ir_constant_data value
;
1450 /* Array elements */
1451 ir_constant
**array_elements
;
1453 /* Structure fields */
1454 exec_list components
;
1458 * Parameterless constructor only used by the clone method
1466 * Apply a visitor to each IR node in a list
1469 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
1472 * Validate invariants on each IR node in a list
1474 void validate_ir_tree(exec_list
*instructions
);
1477 * Make a clone of each IR instruction in a list
1479 * \param in List of IR instructions that are to be cloned
1480 * \param out List to hold the cloned instructions
1483 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
1486 _mesa_glsl_initialize_variables(exec_list
*instructions
,
1487 struct _mesa_glsl_parse_state
*state
);
1490 _mesa_glsl_initialize_functions(exec_list
*instructions
,
1491 struct _mesa_glsl_parse_state
*state
);
1494 _mesa_glsl_release_functions(void);
1497 reparent_ir(exec_list
*list
, void *mem_ctx
);
1499 struct glsl_symbol_table
;
1502 import_prototypes(const exec_list
*source
, exec_list
*dest
,
1503 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
1506 ir_has_call(ir_instruction
*ir
);
1509 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
);