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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 unsigned write_mask
:4;
653 /* Update ir_expression::num_operands() and operator_strs when
654 * updating this list.
656 enum ir_expression_operation
{
665 ir_unop_exp
, /**< Log base e on gentype */
666 ir_unop_log
, /**< Natural log on gentype */
669 ir_unop_f2i
, /**< Float-to-integer conversion. */
670 ir_unop_i2f
, /**< Integer-to-float conversion. */
671 ir_unop_f2b
, /**< Float-to-boolean conversion */
672 ir_unop_b2f
, /**< Boolean-to-float conversion */
673 ir_unop_i2b
, /**< int-to-boolean conversion */
674 ir_unop_b2i
, /**< Boolean-to-int conversion */
675 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
679 * \name Unary floating-point rounding operations.
689 * \name Trigonometric operations.
697 * \name Partial derivatives.
712 * Takes one of two combinations of arguments:
717 * Does not take integer types.
722 * \name Binary comparison operators
732 * Returns single boolean for whether all components of operands[0]
733 * equal the components of operands[1].
737 * Returns single boolean for whether any component of operands[0]
738 * is not equal to the corresponding component of operands[1].
744 * \name Bit-wise binary operations.
766 class ir_expression
: public ir_rvalue
{
768 ir_expression(int op
, const struct glsl_type
*type
,
769 ir_rvalue
*, ir_rvalue
*);
771 virtual ir_expression
*as_expression()
776 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
779 * Attempt to constant-fold the expression
781 * If the expression cannot be constant folded, this method will return
784 virtual ir_constant
*constant_expression_value();
787 * Determine the number of operands used by an expression
789 static unsigned int get_num_operands(ir_expression_operation
);
792 * Determine the number of operands used by an expression
794 unsigned int get_num_operands() const
796 return get_num_operands(operation
);
800 * Return a string representing this expression's operator.
802 const char *operator_string();
805 * Return a string representing this expression's operator.
807 static const char *operator_string(ir_expression_operation
);
811 * Do a reverse-lookup to translate the given string into an operator.
813 static ir_expression_operation
get_operator(const char *);
815 virtual void accept(ir_visitor
*v
)
820 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
822 ir_expression_operation operation
;
823 ir_rvalue
*operands
[2];
828 * IR instruction representing a function call
830 class ir_call
: public ir_rvalue
{
832 ir_call(ir_function_signature
*callee
, exec_list
*actual_parameters
)
835 ir_type
= ir_type_call
;
836 assert(callee
->return_type
!= NULL
);
837 type
= callee
->return_type
;
838 actual_parameters
->move_nodes_to(& this->actual_parameters
);
841 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
843 virtual ir_constant
*constant_expression_value();
845 virtual ir_call
*as_call()
850 virtual void accept(ir_visitor
*v
)
855 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
858 * Get a generic ir_call object when an error occurs
860 * Any allocation will be performed with 'ctx' as talloc owner.
862 static ir_call
*get_error_instruction(void *ctx
);
865 * Get an iterator for the set of acutal parameters
867 exec_list_iterator
iterator()
869 return actual_parameters
.iterator();
873 * Get the name of the function being called.
875 const char *callee_name() const
877 return callee
->function_name();
881 * Get the function signature bound to this function call
883 ir_function_signature
*get_callee()
889 * Set the function call target
891 void set_callee(ir_function_signature
*sig
);
894 * Generates an inline version of the function before @ir,
895 * returning the return value of the function.
897 ir_rvalue
*generate_inline(ir_instruction
*ir
);
899 /* List of ir_rvalue of paramaters passed in this call. */
900 exec_list actual_parameters
;
906 this->ir_type
= ir_type_call
;
909 ir_function_signature
*callee
;
914 * \name Jump-like IR instructions.
916 * These include \c break, \c continue, \c return, and \c discard.
919 class ir_jump
: public ir_instruction
{
923 ir_type
= ir_type_unset
;
927 class ir_return
: public ir_jump
{
932 this->ir_type
= ir_type_return
;
935 ir_return(ir_rvalue
*value
)
938 this->ir_type
= ir_type_return
;
941 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
943 virtual ir_return
*as_return()
948 ir_rvalue
*get_value() const
953 virtual void accept(ir_visitor
*v
)
958 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
965 * Jump instructions used inside loops
967 * These include \c break and \c continue. The \c break within a loop is
968 * different from the \c break within a switch-statement.
972 class ir_loop_jump
: public ir_jump
{
979 ir_loop_jump(jump_mode mode
)
981 this->ir_type
= ir_type_loop_jump
;
986 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
988 virtual void accept(ir_visitor
*v
)
993 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
995 bool is_break() const
997 return mode
== jump_break
;
1000 bool is_continue() const
1002 return mode
== jump_continue
;
1005 /** Mode selector for the jump instruction. */
1006 enum jump_mode mode
;
1008 /** Loop containing this break instruction. */
1013 * IR instruction representing discard statements.
1015 class ir_discard
: public ir_jump
{
1019 this->ir_type
= ir_type_discard
;
1020 this->condition
= NULL
;
1023 ir_discard(ir_rvalue
*cond
)
1025 this->ir_type
= ir_type_discard
;
1026 this->condition
= cond
;
1029 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1031 virtual void accept(ir_visitor
*v
)
1036 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1038 ir_rvalue
*condition
;
1044 * Texture sampling opcodes used in ir_texture
1046 enum ir_texture_opcode
{
1047 ir_tex
, /**< Regular texture look-up */
1048 ir_txb
, /**< Texture look-up with LOD bias */
1049 ir_txl
, /**< Texture look-up with explicit LOD */
1050 ir_txd
, /**< Texture look-up with partial derivatvies */
1051 ir_txf
/**< Texel fetch with explicit LOD */
1056 * IR instruction to sample a texture
1058 * The specific form of the IR instruction depends on the \c mode value
1059 * selected from \c ir_texture_opcodes. In the printed IR, these will
1063 * | Projection divisor
1064 * | | Shadow comparitor
1067 * (tex (sampler) (coordinate) (0 0 0) (1) ( ))
1068 * (txb (sampler) (coordinate) (0 0 0) (1) ( ) (bias))
1069 * (txl (sampler) (coordinate) (0 0 0) (1) ( ) (lod))
1070 * (txd (sampler) (coordinate) (0 0 0) (1) ( ) (dPdx dPdy))
1071 * (txf (sampler) (coordinate) (0 0 0) (lod))
1073 class ir_texture
: public ir_rvalue
{
1075 ir_texture(enum ir_texture_opcode op
)
1076 : op(op
), projector(NULL
), shadow_comparitor(NULL
)
1078 this->ir_type
= ir_type_texture
;
1081 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1083 virtual ir_constant
*constant_expression_value();
1085 virtual void accept(ir_visitor
*v
)
1090 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1093 * Return a string representing the ir_texture_opcode.
1095 const char *opcode_string();
1097 /** Set the sampler and infer the type. */
1098 void set_sampler(ir_dereference
*sampler
);
1101 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1103 static ir_texture_opcode
get_opcode(const char *);
1105 enum ir_texture_opcode op
;
1107 /** Sampler to use for the texture access. */
1108 ir_dereference
*sampler
;
1110 /** Texture coordinate to sample */
1111 ir_rvalue
*coordinate
;
1114 * Value used for projective divide.
1116 * If there is no projective divide (the common case), this will be
1117 * \c NULL. Optimization passes should check for this to point to a constant
1118 * of 1.0 and replace that with \c NULL.
1120 ir_rvalue
*projector
;
1123 * Coordinate used for comparison on shadow look-ups.
1125 * If there is no shadow comparison, this will be \c NULL. For the
1126 * \c ir_txf opcode, this *must* be \c NULL.
1128 ir_rvalue
*shadow_comparitor
;
1130 /** Explicit texel offsets. */
1131 signed char offsets
[3];
1134 ir_rvalue
*lod
; /**< Floating point LOD */
1135 ir_rvalue
*bias
; /**< Floating point LOD bias */
1137 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1138 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1144 struct ir_swizzle_mask
{
1151 * Number of components in the swizzle.
1153 unsigned num_components
:3;
1156 * Does the swizzle contain duplicate components?
1158 * L-value swizzles cannot contain duplicate components.
1160 unsigned has_duplicates
:1;
1164 class ir_swizzle
: public ir_rvalue
{
1166 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1169 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1171 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1173 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1175 virtual ir_constant
*constant_expression_value();
1177 virtual ir_swizzle
*as_swizzle()
1183 * Construct an ir_swizzle from the textual representation. Can fail.
1185 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1187 virtual void accept(ir_visitor
*v
)
1192 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1196 return val
->is_lvalue() && !mask
.has_duplicates
;
1200 * Get the variable that is ultimately referenced by an r-value
1202 virtual ir_variable
*variable_referenced();
1205 ir_swizzle_mask mask
;
1209 * Initialize the mask component of a swizzle
1211 * This is used by the \c ir_swizzle constructors.
1213 void init_mask(const unsigned *components
, unsigned count
);
1217 class ir_dereference
: public ir_rvalue
{
1219 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1221 virtual ir_dereference
*as_dereference()
1229 * Get the variable that is ultimately referenced by an r-value
1231 virtual ir_variable
*variable_referenced() = 0;
1235 class ir_dereference_variable
: public ir_dereference
{
1237 ir_dereference_variable(ir_variable
*var
);
1239 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1240 struct hash_table
*) const;
1242 virtual ir_constant
*constant_expression_value();
1244 virtual ir_dereference_variable
*as_dereference_variable()
1250 * Get the variable that is ultimately referenced by an r-value
1252 virtual ir_variable
*variable_referenced()
1257 virtual ir_variable
*whole_variable_referenced()
1259 /* ir_dereference_variable objects always dereference the entire
1260 * variable. However, if this dereference is dereferenced by anything
1261 * else, the complete deferefernce chain is not a whole-variable
1262 * dereference. This method should only be called on the top most
1263 * ir_rvalue in a dereference chain.
1268 virtual void accept(ir_visitor
*v
)
1273 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1276 * Object being dereferenced.
1282 class ir_dereference_array
: public ir_dereference
{
1284 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1286 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1288 virtual ir_dereference_array
*clone(void *mem_ctx
,
1289 struct hash_table
*) const;
1291 virtual ir_constant
*constant_expression_value();
1293 virtual ir_dereference_array
*as_dereference_array()
1299 * Get the variable that is ultimately referenced by an r-value
1301 virtual ir_variable
*variable_referenced()
1303 return this->array
->variable_referenced();
1306 virtual void accept(ir_visitor
*v
)
1311 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1314 ir_rvalue
*array_index
;
1317 void set_array(ir_rvalue
*value
);
1321 class ir_dereference_record
: public ir_dereference
{
1323 ir_dereference_record(ir_rvalue
*value
, const char *field
);
1325 ir_dereference_record(ir_variable
*var
, const char *field
);
1327 virtual ir_dereference_record
*clone(void *mem_ctx
,
1328 struct hash_table
*) const;
1330 virtual ir_constant
*constant_expression_value();
1333 * Get the variable that is ultimately referenced by an r-value
1335 virtual ir_variable
*variable_referenced()
1337 return this->record
->variable_referenced();
1340 virtual void accept(ir_visitor
*v
)
1345 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1353 * Data stored in an ir_constant
1355 union ir_constant_data
{
1363 class ir_constant
: public ir_rvalue
{
1365 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
1366 ir_constant(bool b
);
1367 ir_constant(unsigned int u
);
1369 ir_constant(float f
);
1372 * Construct an ir_constant from a list of ir_constant values
1374 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
1377 * Construct an ir_constant from a scalar component of another ir_constant
1379 * The new \c ir_constant inherits the type of the component from the
1383 * In the case of a matrix constant, the new constant is a scalar, \b not
1386 ir_constant(const ir_constant
*c
, unsigned i
);
1389 * Return a new ir_constant of the specified type containing all zeros.
1391 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
1393 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
1395 virtual ir_constant
*constant_expression_value();
1397 virtual ir_constant
*as_constant()
1402 virtual void accept(ir_visitor
*v
)
1407 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1410 * Get a particular component of a constant as a specific type
1412 * This is useful, for example, to get a value from an integer constant
1413 * as a float or bool. This appears frequently when constructors are
1414 * called with all constant parameters.
1417 bool get_bool_component(unsigned i
) const;
1418 float get_float_component(unsigned i
) const;
1419 int get_int_component(unsigned i
) const;
1420 unsigned get_uint_component(unsigned i
) const;
1423 ir_constant
*get_array_element(unsigned i
) const;
1425 ir_constant
*get_record_field(const char *name
);
1428 * Determine whether a constant has the same value as another constant
1430 bool has_value(const ir_constant
*) const;
1433 * Value of the constant.
1435 * The field used to back the values supplied by the constant is determined
1436 * by the type associated with the \c ir_instruction. Constants may be
1437 * scalars, vectors, or matrices.
1439 union ir_constant_data value
;
1441 /* Array elements */
1442 ir_constant
**array_elements
;
1444 /* Structure fields */
1445 exec_list components
;
1449 * Parameterless constructor only used by the clone method
1457 * Apply a visitor to each IR node in a list
1460 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
1463 * Validate invariants on each IR node in a list
1465 void validate_ir_tree(exec_list
*instructions
);
1468 * Make a clone of each IR instruction in a list
1470 * \param in List of IR instructions that are to be cloned
1471 * \param out List to hold the cloned instructions
1474 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
1477 _mesa_glsl_initialize_variables(exec_list
*instructions
,
1478 struct _mesa_glsl_parse_state
*state
);
1481 _mesa_glsl_initialize_functions(exec_list
*instructions
,
1482 struct _mesa_glsl_parse_state
*state
);
1485 _mesa_glsl_release_functions(void);
1488 reparent_ir(exec_list
*list
, void *mem_ctx
);
1490 struct glsl_symbol_table
;
1493 import_prototypes(const exec_list
*source
, exec_list
*dest
,
1494 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
1497 ir_has_call(ir_instruction
*ir
);
1500 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
);