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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]))
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);