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33 #include "glsl_types.h"
35 #include "ir_visitor.h"
36 #include "ir_hierarchical_visitor.h"
37 #include "main/mtypes.h"
40 * \defgroup IR Intermediate representation nodes
48 * Each concrete class derived from \c ir_instruction has a value in this
49 * enumerant. The value for the type is stored in \c ir_instruction::ir_type
50 * by the constructor. While using type tags is not very C++, it is extremely
51 * convenient. For example, during debugging you can simply inspect
52 * \c ir_instruction::ir_type to find out the actual type of the object.
54 * In addition, it is possible to use a switch-statement based on \c
55 * \c ir_instruction::ir_type to select different behavior for different object
56 * types. For functions that have only slight differences for several object
57 * types, this allows writing very straightforward, readable code.
61 * Zero is unused so that the IR validator can detect cases where
62 * \c ir_instruction::ir_type has not been initialized.
69 ir_type_dereference_array
,
70 ir_type_dereference_record
,
71 ir_type_dereference_variable
,
75 ir_type_function_signature
,
82 ir_type_max
/**< maximum ir_type enum number, for validation */
86 * Base class of all IR instructions
88 class ir_instruction
: public exec_node
{
90 enum ir_node_type ir_type
;
93 * GCC 4.7+ and clang warn when deleting an ir_instruction unless
94 * there's a virtual destructor present. Because we almost
95 * universally use ralloc for our memory management of
96 * ir_instructions, the destructor doesn't need to do any work.
98 virtual ~ir_instruction()
102 /** ir_print_visitor helper for debugging. */
103 void print(void) const;
105 virtual void accept(ir_visitor
*) = 0;
106 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
107 virtual ir_instruction
*clone(void *mem_ctx
,
108 struct hash_table
*ht
) const = 0;
111 * \name IR instruction downcast functions
113 * These functions either cast the object to a derived class or return
114 * \c NULL if the object's type does not match the specified derived class.
115 * Additional downcast functions will be added as needed.
118 virtual class ir_variable
* as_variable() { return NULL
; }
119 virtual class ir_function
* as_function() { return NULL
; }
120 virtual class ir_dereference
* as_dereference() { return NULL
; }
121 virtual class ir_dereference_array
* as_dereference_array() { return NULL
; }
122 virtual class ir_dereference_variable
*as_dereference_variable() { return NULL
; }
123 virtual class ir_expression
* as_expression() { return NULL
; }
124 virtual class ir_rvalue
* as_rvalue() { return NULL
; }
125 virtual class ir_loop
* as_loop() { return NULL
; }
126 virtual class ir_assignment
* as_assignment() { return NULL
; }
127 virtual class ir_call
* as_call() { return NULL
; }
128 virtual class ir_return
* as_return() { return NULL
; }
129 virtual class ir_if
* as_if() { return NULL
; }
130 virtual class ir_swizzle
* as_swizzle() { return NULL
; }
131 virtual class ir_constant
* as_constant() { return NULL
; }
132 virtual class ir_discard
* as_discard() { return NULL
; }
138 ir_type
= ir_type_unset
;
144 * The base class for all "values"/expression trees.
146 class ir_rvalue
: public ir_instruction
{
148 const struct glsl_type
*type
;
150 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const;
152 virtual void accept(ir_visitor
*v
)
157 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
159 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
161 virtual ir_rvalue
* as_rvalue()
166 ir_rvalue
*as_rvalue_to_saturate();
168 virtual bool is_lvalue() const
174 * Get the variable that is ultimately referenced by an r-value
176 virtual ir_variable
*variable_referenced() const
183 * If an r-value is a reference to a whole variable, get that variable
186 * Pointer to a variable that is completely dereferenced by the r-value. If
187 * the r-value is not a dereference or the dereference does not access the
188 * entire variable (i.e., it's just one array element, struct field), \c NULL
191 virtual ir_variable
*whole_variable_referenced()
197 * Determine if an r-value has the value zero
199 * The base implementation of this function always returns \c false. The
200 * \c ir_constant class over-rides this function to return \c true \b only
201 * for vector and scalar types that have all elements set to the value
202 * zero (or \c false for booleans).
204 * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one,
205 * ir_constant::is_basis
207 virtual bool is_zero() const;
210 * Determine if an r-value has the value one
212 * The base implementation of this function always returns \c false. The
213 * \c ir_constant class over-rides this function to return \c true \b only
214 * for vector and scalar types that have all elements set to the value
215 * one (or \c true for booleans).
217 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one,
218 * ir_constant::is_basis
220 virtual bool is_one() const;
223 * Determine if an r-value has the value negative one
225 * The base implementation of this function always returns \c false. The
226 * \c ir_constant class over-rides this function to return \c true \b only
227 * for vector and scalar types that have all elements set to the value
228 * negative one. For boolean types, the result is always \c false.
230 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one
231 * ir_constant::is_basis
233 virtual bool is_negative_one() const;
236 * Determine if an r-value is a basis vector
238 * The base implementation of this function always returns \c false. The
239 * \c ir_constant class over-rides this function to return \c true \b only
240 * for vector and scalar types that have one element set to the value one,
241 * and the other elements set to the value zero. For boolean types, the
242 * result is always \c false.
244 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one,
245 * is_constant::is_negative_one
247 virtual bool is_basis() const;
251 * Return a generic value of error_type.
253 * Allocation will be performed with 'mem_ctx' as ralloc owner.
255 static ir_rvalue
*error_value(void *mem_ctx
);
263 * Variable storage classes
265 enum ir_variable_mode
{
266 ir_var_auto
= 0, /**< Function local variables and globals. */
267 ir_var_uniform
, /**< Variable declared as a uniform. */
271 ir_var_const_in
, /**< "in" param that must be a constant expression */
272 ir_var_system_value
, /**< Ex: front-face, instance-id, etc. */
273 ir_var_temporary
/**< Temporary variable generated during compilation. */
277 * \brief Layout qualifiers for gl_FragDepth.
279 * The AMD/ARB_conservative_depth extensions allow gl_FragDepth to be redeclared
280 * with a layout qualifier.
282 enum ir_depth_layout
{
283 ir_depth_layout_none
, /**< No depth layout is specified. */
285 ir_depth_layout_greater
,
286 ir_depth_layout_less
,
287 ir_depth_layout_unchanged
291 * \brief Convert depth layout qualifier to string.
294 depth_layout_string(ir_depth_layout layout
);
297 * Description of built-in state associated with a uniform
299 * \sa ir_variable::state_slots
301 struct ir_state_slot
{
306 class ir_variable
: public ir_instruction
{
308 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
310 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
312 virtual ir_variable
*as_variable()
317 virtual void accept(ir_visitor
*v
)
322 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
326 * Get the string value for the interpolation qualifier
328 * \return The string that would be used in a shader to specify \c
329 * mode will be returned.
331 * This function is used to generate error messages of the form "shader
332 * uses %s interpolation qualifier", so in the case where there is no
333 * interpolation qualifier, it returns "no".
335 * This function should only be used on a shader input or output variable.
337 const char *interpolation_string() const;
340 * Determine how this variable should be interpolated based on its
341 * interpolation qualifier (if present), whether it is gl_Color or
342 * gl_SecondaryColor, and whether flatshading is enabled in the current GL
345 * The return value will always be either INTERP_QUALIFIER_SMOOTH,
346 * INTERP_QUALIFIER_NOPERSPECTIVE, or INTERP_QUALIFIER_FLAT.
348 glsl_interp_qualifier
determine_interpolation_mode(bool flat_shade
);
351 * Declared type of the variable
353 const struct glsl_type
*type
;
356 * Declared name of the variable
361 * Highest element accessed with a constant expression array index
363 * Not used for non-array variables.
365 unsigned max_array_access
;
368 * Is the variable read-only?
370 * This is set for variables declared as \c const, shader inputs,
373 unsigned read_only
:1;
375 unsigned invariant
:1;
378 * Has this variable been used for reading or writing?
380 * Several GLSL semantic checks require knowledge of whether or not a
381 * variable has been used. For example, it is an error to redeclare a
382 * variable as invariant after it has been used.
384 * This is only maintained in the ast_to_hir.cpp path, not in
385 * Mesa's fixed function or ARB program paths.
390 * Has this variable been statically assigned?
392 * This answers whether the variable was assigned in any path of
393 * the shader during ast_to_hir. This doesn't answer whether it is
394 * still written after dead code removal, nor is it maintained in
395 * non-ast_to_hir.cpp (GLSL parsing) paths.
400 * Storage class of the variable.
402 * \sa ir_variable_mode
407 * Interpolation mode for shader inputs / outputs
409 * \sa ir_variable_interpolation
411 unsigned interpolation
:2;
414 * \name ARB_fragment_coord_conventions
417 unsigned origin_upper_left
:1;
418 unsigned pixel_center_integer
:1;
422 * Was the location explicitly set in the shader?
424 * If the location is explicitly set in the shader, it \b cannot be changed
425 * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
428 unsigned explicit_location
:1;
429 unsigned explicit_index
:1;
432 * Does this variable have an initializer?
434 * This is used by the linker to cross-validiate initializers of global
437 unsigned has_initializer
:1;
440 * Is this variable a generic output or input that has not yet been matched
441 * up to a variable in another stage of the pipeline?
443 * This is used by the linker as scratch storage while assigning locations
444 * to generic inputs and outputs.
446 unsigned is_unmatched_generic_inout
:1;
449 * \brief Layout qualifier for gl_FragDepth.
451 * This is not equal to \c ir_depth_layout_none if and only if this
452 * variable is \c gl_FragDepth and a layout qualifier is specified.
454 ir_depth_layout depth_layout
;
457 * Storage location of the base of this variable
459 * The precise meaning of this field depends on the nature of the variable.
461 * - Vertex shader input: one of the values from \c gl_vert_attrib.
462 * - Vertex shader output: one of the values from \c gl_vert_result.
463 * - Fragment shader input: one of the values from \c gl_frag_attrib.
464 * - Fragment shader output: one of the values from \c gl_frag_result.
465 * - Uniforms: Per-stage uniform slot number for default uniform block.
466 * - Uniforms: Index within the uniform block definition for UBO members.
467 * - Other: This field is not currently used.
469 * If the variable is a uniform, shader input, or shader output, and the
470 * slot has not been assigned, the value will be -1.
475 * Uniform block number for uniforms.
477 * This index is into the shader's list of uniform blocks, not the
478 * linked program's merged list.
480 * If the variable is not in a uniform block, the value will be -1.
485 * output index for dual source blending.
490 * Built-in state that backs this uniform
492 * Once set at variable creation, \c state_slots must remain invariant.
493 * This is because, ideally, this array would be shared by all clones of
494 * this variable in the IR tree. In other words, we'd really like for it
495 * to be a fly-weight.
497 * If the variable is not a uniform, \c num_state_slots will be zero and
498 * \c state_slots will be \c NULL.
501 unsigned num_state_slots
; /**< Number of state slots used */
502 ir_state_slot
*state_slots
; /**< State descriptors. */
506 * Emit a warning if this variable is accessed.
508 const char *warn_extension
;
511 * Value assigned in the initializer of a variable declared "const"
513 ir_constant
*constant_value
;
516 * Constant expression assigned in the initializer of the variable
519 * This field and \c ::constant_value are distinct. Even if the two fields
520 * refer to constants with the same value, they must point to separate
523 ir_constant
*constant_initializer
;
529 * The representation of a function instance; may be the full definition or
530 * simply a prototype.
532 class ir_function_signature
: public ir_instruction
{
533 /* An ir_function_signature will be part of the list of signatures in
537 ir_function_signature(const glsl_type
*return_type
);
539 virtual ir_function_signature
*clone(void *mem_ctx
,
540 struct hash_table
*ht
) const;
541 ir_function_signature
*clone_prototype(void *mem_ctx
,
542 struct hash_table
*ht
) const;
544 virtual void accept(ir_visitor
*v
)
549 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
552 * Attempt to evaluate this function as a constant expression,
553 * given a list of the actual parameters and the variable context.
554 * Returns NULL for non-built-ins.
556 ir_constant
*constant_expression_value(exec_list
*actual_parameters
, struct hash_table
*variable_context
);
559 * Get the name of the function for which this is a signature
561 const char *function_name() const;
564 * Get a handle to the function for which this is a signature
566 * There is no setter function, this function returns a \c const pointer,
567 * and \c ir_function_signature::_function is private for a reason. The
568 * only way to make a connection between a function and function signature
569 * is via \c ir_function::add_signature. This helps ensure that certain
570 * invariants (i.e., a function signature is in the list of signatures for
571 * its \c _function) are met.
573 * \sa ir_function::add_signature
575 inline const class ir_function
*function() const
577 return this->_function
;
581 * Check whether the qualifiers match between this signature's parameters
582 * and the supplied parameter list. If not, returns the name of the first
583 * parameter with mismatched qualifiers (for use in error messages).
585 const char *qualifiers_match(exec_list
*params
);
588 * Replace the current parameter list with the given one. This is useful
589 * if the current information came from a prototype, and either has invalid
590 * or missing parameter names.
592 void replace_parameters(exec_list
*new_params
);
595 * Function return type.
597 * \note This discards the optional precision qualifier.
599 const struct glsl_type
*return_type
;
602 * List of ir_variable of function parameters.
604 * This represents the storage. The paramaters passed in a particular
605 * call will be in ir_call::actual_paramaters.
607 struct exec_list parameters
;
609 /** Whether or not this function has a body (which may be empty). */
610 unsigned is_defined
:1;
612 /** Whether or not this function signature is a built-in. */
613 unsigned is_builtin
:1;
615 /** Body of instructions in the function. */
616 struct exec_list body
;
619 /** Function of which this signature is one overload. */
620 class ir_function
*_function
;
622 /** Function signature of which this one is a prototype clone */
623 const ir_function_signature
*origin
;
625 friend class ir_function
;
628 * Helper function to run a list of instructions for constant
629 * expression evaluation.
631 * The hash table represents the values of the visible variables.
632 * There are no scoping issues because the table is indexed on
633 * ir_variable pointers, not variable names.
635 * Returns false if the expression is not constant, true otherwise,
636 * and the value in *result if result is non-NULL.
638 bool constant_expression_evaluate_expression_list(const struct exec_list
&body
,
639 struct hash_table
*variable_context
,
640 ir_constant
**result
);
645 * Header for tracking multiple overloaded functions with the same name.
646 * Contains a list of ir_function_signatures representing each of the
649 class ir_function
: public ir_instruction
{
651 ir_function(const char *name
);
653 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
655 virtual ir_function
*as_function()
660 virtual void accept(ir_visitor
*v
)
665 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
667 void add_signature(ir_function_signature
*sig
)
669 sig
->_function
= this;
670 this->signatures
.push_tail(sig
);
674 * Get an iterator for the set of function signatures
676 exec_list_iterator
iterator()
678 return signatures
.iterator();
682 * Find a signature that matches a set of actual parameters, taking implicit
683 * conversions into account. Also flags whether the match was exact.
685 ir_function_signature
*matching_signature(const exec_list
*actual_param
,
686 bool *match_is_exact
);
689 * Find a signature that matches a set of actual parameters, taking implicit
690 * conversions into account.
692 ir_function_signature
*matching_signature(const exec_list
*actual_param
);
695 * Find a signature that exactly matches a set of actual parameters without
696 * any implicit type conversions.
698 ir_function_signature
*exact_matching_signature(const exec_list
*actual_ps
);
701 * Name of the function.
705 /** Whether or not this function has a signature that isn't a built-in. */
706 bool has_user_signature();
709 * List of ir_function_signature for each overloaded function with this name.
711 struct exec_list signatures
;
714 inline const char *ir_function_signature::function_name() const
716 return this->_function
->name
;
722 * IR instruction representing high-level if-statements
724 class ir_if
: public ir_instruction
{
726 ir_if(ir_rvalue
*condition
)
727 : condition(condition
)
729 ir_type
= ir_type_if
;
732 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
734 virtual ir_if
*as_if()
739 virtual void accept(ir_visitor
*v
)
744 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
746 ir_rvalue
*condition
;
747 /** List of ir_instruction for the body of the then branch */
748 exec_list then_instructions
;
749 /** List of ir_instruction for the body of the else branch */
750 exec_list else_instructions
;
755 * IR instruction representing a high-level loop structure.
757 class ir_loop
: public ir_instruction
{
761 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
763 virtual void accept(ir_visitor
*v
)
768 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
770 virtual ir_loop
*as_loop()
776 * Get an iterator for the instructions of the loop body
778 exec_list_iterator
iterator()
780 return body_instructions
.iterator();
783 /** List of ir_instruction that make up the body of the loop. */
784 exec_list body_instructions
;
787 * \name Loop counter and controls
789 * Represents a loop like a FORTRAN \c do-loop.
792 * If \c from and \c to are the same value, the loop will execute once.
795 ir_rvalue
*from
; /** Value of the loop counter on the first
796 * iteration of the loop.
798 ir_rvalue
*to
; /** Value of the loop counter on the last
799 * iteration of the loop.
801 ir_rvalue
*increment
;
802 ir_variable
*counter
;
805 * Comparison operation in the loop terminator.
807 * If any of the loop control fields are non-\c NULL, this field must be
808 * one of \c ir_binop_less, \c ir_binop_greater, \c ir_binop_lequal,
809 * \c ir_binop_gequal, \c ir_binop_equal, or \c ir_binop_nequal.
816 class ir_assignment
: public ir_instruction
{
818 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
= NULL
);
821 * Construct an assignment with an explicit write mask
824 * Since a write mask is supplied, the LHS must already be a bare
825 * \c ir_dereference. The cannot be any swizzles in the LHS.
827 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
828 unsigned write_mask
);
830 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
832 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
834 virtual void accept(ir_visitor
*v
)
839 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
841 virtual ir_assignment
* as_assignment()
847 * Get a whole variable written by an assignment
849 * If the LHS of the assignment writes a whole variable, the variable is
850 * returned. Otherwise \c NULL is returned. Examples of whole-variable
853 * - Assigning to a scalar
854 * - Assigning to all components of a vector
855 * - Whole array (or matrix) assignment
856 * - Whole structure assignment
858 ir_variable
*whole_variable_written();
861 * Set the LHS of an assignment
863 void set_lhs(ir_rvalue
*lhs
);
866 * Left-hand side of the assignment.
868 * This should be treated as read only. If you need to set the LHS of an
869 * assignment, use \c ir_assignment::set_lhs.
874 * Value being assigned
879 * Optional condition for the assignment.
881 ir_rvalue
*condition
;
885 * Component mask written
887 * For non-vector types in the LHS, this field will be zero. For vector
888 * types, a bit will be set for each component that is written. Note that
889 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
891 * A partially-set write mask means that each enabled channel gets
892 * the value from a consecutive channel of the rhs. For example,
893 * to write just .xyw of gl_FrontColor with color:
895 * (assign (constant bool (1)) (xyw)
896 * (var_ref gl_FragColor)
897 * (swiz xyw (var_ref color)))
899 unsigned write_mask
:4;
902 /* Update ir_expression::num_operands() and operator_strs when
903 * updating this list.
905 enum ir_expression_operation
{
914 ir_unop_exp
, /**< Log base e on gentype */
915 ir_unop_log
, /**< Natural log on gentype */
918 ir_unop_f2i
, /**< Float-to-integer conversion. */
919 ir_unop_f2u
, /**< Float-to-unsigned conversion. */
920 ir_unop_i2f
, /**< Integer-to-float conversion. */
921 ir_unop_f2b
, /**< Float-to-boolean conversion */
922 ir_unop_b2f
, /**< Boolean-to-float conversion */
923 ir_unop_i2b
, /**< int-to-boolean conversion */
924 ir_unop_b2i
, /**< Boolean-to-int conversion */
925 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
926 ir_unop_i2u
, /**< Integer-to-unsigned conversion. */
927 ir_unop_u2i
, /**< Unsigned-to-integer conversion. */
928 ir_unop_bitcast_i2f
, /**< Bit-identical int-to-float "conversion" */
929 ir_unop_bitcast_f2i
, /**< Bit-identical float-to-int "conversion" */
930 ir_unop_bitcast_u2f
, /**< Bit-identical uint-to-float "conversion" */
931 ir_unop_bitcast_f2u
, /**< Bit-identical float-to-uint "conversion" */
935 * \name Unary floating-point rounding operations.
946 * \name Trigonometric operations.
951 ir_unop_sin_reduced
, /**< Reduced range sin. [-pi, pi] */
952 ir_unop_cos_reduced
, /**< Reduced range cos. [-pi, pi] */
956 * \name Partial derivatives.
966 * A sentinel marking the last of the unary operations.
968 ir_last_unop
= ir_unop_noise
,
976 * Takes one of two combinations of arguments:
981 * Does not take integer types.
986 * \name Binary comparison operators which return a boolean vector.
987 * The type of both operands must be equal.
997 * Returns single boolean for whether all components of operands[0]
998 * equal the components of operands[1].
1002 * Returns single boolean for whether any component of operands[0]
1003 * is not equal to the corresponding component of operands[1].
1005 ir_binop_any_nequal
,
1009 * \name Bit-wise binary operations.
1030 * Load a value the size of a given GLSL type from a uniform block.
1032 * operand0 is the ir_constant uniform block index in the linked shader.
1033 * operand1 is a byte offset within the uniform block.
1038 * A sentinel marking the last of the binary operations.
1040 ir_last_binop
= ir_binop_ubo_load
,
1045 * A sentinel marking the last of all operations.
1047 ir_last_opcode
= ir_quadop_vector
1050 class ir_expression
: public ir_rvalue
{
1053 * Constructor for unary operation expressions
1055 ir_expression(int op
, const struct glsl_type
*type
, ir_rvalue
*);
1056 ir_expression(int op
, ir_rvalue
*);
1059 * Constructor for binary operation expressions
1061 ir_expression(int op
, const struct glsl_type
*type
,
1062 ir_rvalue
*, ir_rvalue
*);
1063 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
);
1066 * Constructor for quad operator expressions
1068 ir_expression(int op
, const struct glsl_type
*type
,
1069 ir_rvalue
*, ir_rvalue
*, ir_rvalue
*, ir_rvalue
*);
1071 virtual ir_expression
*as_expression()
1076 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1079 * Attempt to constant-fold the expression
1081 * The "variable_context" hash table links ir_variable * to ir_constant *
1082 * that represent the variables' values. \c NULL represents an empty
1085 * If the expression cannot be constant folded, this method will return
1088 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1091 * Determine the number of operands used by an expression
1093 static unsigned int get_num_operands(ir_expression_operation
);
1096 * Determine the number of operands used by an expression
1098 unsigned int get_num_operands() const
1100 return (this->operation
== ir_quadop_vector
)
1101 ? this->type
->vector_elements
: get_num_operands(operation
);
1105 * Return a string representing this expression's operator.
1107 const char *operator_string();
1110 * Return a string representing this expression's operator.
1112 static const char *operator_string(ir_expression_operation
);
1116 * Do a reverse-lookup to translate the given string into an operator.
1118 static ir_expression_operation
get_operator(const char *);
1120 virtual void accept(ir_visitor
*v
)
1125 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1127 ir_expression_operation operation
;
1128 ir_rvalue
*operands
[4];
1133 * HIR instruction representing a high-level function call, containing a list
1134 * of parameters and returning a value in the supplied temporary.
1136 class ir_call
: public ir_instruction
{
1138 ir_call(ir_function_signature
*callee
,
1139 ir_dereference_variable
*return_deref
,
1140 exec_list
*actual_parameters
)
1141 : return_deref(return_deref
), callee(callee
)
1143 ir_type
= ir_type_call
;
1144 assert(callee
->return_type
!= NULL
);
1145 actual_parameters
->move_nodes_to(& this->actual_parameters
);
1146 this->use_builtin
= callee
->is_builtin
;
1149 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1151 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1153 virtual ir_call
*as_call()
1158 virtual void accept(ir_visitor
*v
)
1163 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1166 * Get an iterator for the set of acutal parameters
1168 exec_list_iterator
iterator()
1170 return actual_parameters
.iterator();
1174 * Get the name of the function being called.
1176 const char *callee_name() const
1178 return callee
->function_name();
1182 * Generates an inline version of the function before @ir,
1183 * storing the return value in return_deref.
1185 void generate_inline(ir_instruction
*ir
);
1188 * Storage for the function's return value.
1189 * This must be NULL if the return type is void.
1191 ir_dereference_variable
*return_deref
;
1194 * The specific function signature being called.
1196 ir_function_signature
*callee
;
1198 /* List of ir_rvalue of paramaters passed in this call. */
1199 exec_list actual_parameters
;
1201 /** Should this call only bind to a built-in function? */
1207 * \name Jump-like IR instructions.
1209 * These include \c break, \c continue, \c return, and \c discard.
1212 class ir_jump
: public ir_instruction
{
1216 ir_type
= ir_type_unset
;
1220 class ir_return
: public ir_jump
{
1225 this->ir_type
= ir_type_return
;
1228 ir_return(ir_rvalue
*value
)
1231 this->ir_type
= ir_type_return
;
1234 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
1236 virtual ir_return
*as_return()
1241 ir_rvalue
*get_value() const
1246 virtual void accept(ir_visitor
*v
)
1251 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1258 * Jump instructions used inside loops
1260 * These include \c break and \c continue. The \c break within a loop is
1261 * different from the \c break within a switch-statement.
1263 * \sa ir_switch_jump
1265 class ir_loop_jump
: public ir_jump
{
1272 ir_loop_jump(jump_mode mode
)
1274 this->ir_type
= ir_type_loop_jump
;
1278 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
1280 virtual void accept(ir_visitor
*v
)
1285 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1287 bool is_break() const
1289 return mode
== jump_break
;
1292 bool is_continue() const
1294 return mode
== jump_continue
;
1297 /** Mode selector for the jump instruction. */
1298 enum jump_mode mode
;
1302 * IR instruction representing discard statements.
1304 class ir_discard
: public ir_jump
{
1308 this->ir_type
= ir_type_discard
;
1309 this->condition
= NULL
;
1312 ir_discard(ir_rvalue
*cond
)
1314 this->ir_type
= ir_type_discard
;
1315 this->condition
= cond
;
1318 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1320 virtual void accept(ir_visitor
*v
)
1325 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1327 virtual ir_discard
*as_discard()
1332 ir_rvalue
*condition
;
1338 * Texture sampling opcodes used in ir_texture
1340 enum ir_texture_opcode
{
1341 ir_tex
, /**< Regular texture look-up */
1342 ir_txb
, /**< Texture look-up with LOD bias */
1343 ir_txl
, /**< Texture look-up with explicit LOD */
1344 ir_txd
, /**< Texture look-up with partial derivatvies */
1345 ir_txf
, /**< Texel fetch with explicit LOD */
1346 ir_txs
/**< Texture size */
1351 * IR instruction to sample a texture
1353 * The specific form of the IR instruction depends on the \c mode value
1354 * selected from \c ir_texture_opcodes. In the printed IR, these will
1357 * Texel offset (0 or an expression)
1358 * | Projection divisor
1359 * | | Shadow comparitor
1362 * (tex <type> <sampler> <coordinate> 0 1 ( ))
1363 * (txb <type> <sampler> <coordinate> 0 1 ( ) <bias>)
1364 * (txl <type> <sampler> <coordinate> 0 1 ( ) <lod>)
1365 * (txd <type> <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
1366 * (txf <type> <sampler> <coordinate> 0 <lod>)
1367 * (txs <type> <sampler> <lod>)
1369 class ir_texture
: public ir_rvalue
{
1371 ir_texture(enum ir_texture_opcode op
)
1372 : op(op
), coordinate(NULL
), projector(NULL
), shadow_comparitor(NULL
),
1375 this->ir_type
= ir_type_texture
;
1378 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1380 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1382 virtual void accept(ir_visitor
*v
)
1387 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1390 * Return a string representing the ir_texture_opcode.
1392 const char *opcode_string();
1394 /** Set the sampler and type. */
1395 void set_sampler(ir_dereference
*sampler
, const glsl_type
*type
);
1398 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1400 static ir_texture_opcode
get_opcode(const char *);
1402 enum ir_texture_opcode op
;
1404 /** Sampler to use for the texture access. */
1405 ir_dereference
*sampler
;
1407 /** Texture coordinate to sample */
1408 ir_rvalue
*coordinate
;
1411 * Value used for projective divide.
1413 * If there is no projective divide (the common case), this will be
1414 * \c NULL. Optimization passes should check for this to point to a constant
1415 * of 1.0 and replace that with \c NULL.
1417 ir_rvalue
*projector
;
1420 * Coordinate used for comparison on shadow look-ups.
1422 * If there is no shadow comparison, this will be \c NULL. For the
1423 * \c ir_txf opcode, this *must* be \c NULL.
1425 ir_rvalue
*shadow_comparitor
;
1427 /** Texel offset. */
1431 ir_rvalue
*lod
; /**< Floating point LOD */
1432 ir_rvalue
*bias
; /**< Floating point LOD bias */
1434 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1435 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1441 struct ir_swizzle_mask
{
1448 * Number of components in the swizzle.
1450 unsigned num_components
:3;
1453 * Does the swizzle contain duplicate components?
1455 * L-value swizzles cannot contain duplicate components.
1457 unsigned has_duplicates
:1;
1461 class ir_swizzle
: public ir_rvalue
{
1463 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1466 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1468 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1470 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1472 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1474 virtual ir_swizzle
*as_swizzle()
1480 * Construct an ir_swizzle from the textual representation. Can fail.
1482 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1484 virtual void accept(ir_visitor
*v
)
1489 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1491 bool is_lvalue() const
1493 return val
->is_lvalue() && !mask
.has_duplicates
;
1497 * Get the variable that is ultimately referenced by an r-value
1499 virtual ir_variable
*variable_referenced() const;
1502 ir_swizzle_mask mask
;
1506 * Initialize the mask component of a swizzle
1508 * This is used by the \c ir_swizzle constructors.
1510 void init_mask(const unsigned *components
, unsigned count
);
1514 class ir_dereference
: public ir_rvalue
{
1516 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1518 virtual ir_dereference
*as_dereference()
1523 bool is_lvalue() const;
1526 * Get the variable that is ultimately referenced by an r-value
1528 virtual ir_variable
*variable_referenced() const = 0;
1531 * Get the constant that is ultimately referenced by an r-value,
1532 * in a constant expression evaluation context.
1534 * The offset is used when the reference is to a specific column of
1537 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const = 0;
1541 class ir_dereference_variable
: public ir_dereference
{
1543 ir_dereference_variable(ir_variable
*var
);
1545 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1546 struct hash_table
*) const;
1548 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1550 virtual ir_dereference_variable
*as_dereference_variable()
1556 * Get the variable that is ultimately referenced by an r-value
1558 virtual ir_variable
*variable_referenced() const
1564 * Get the constant that is ultimately referenced by an r-value,
1565 * in a constant expression evaluation context.
1567 * The offset is used when the reference is to a specific column of
1570 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1572 virtual ir_variable
*whole_variable_referenced()
1574 /* ir_dereference_variable objects always dereference the entire
1575 * variable. However, if this dereference is dereferenced by anything
1576 * else, the complete deferefernce chain is not a whole-variable
1577 * dereference. This method should only be called on the top most
1578 * ir_rvalue in a dereference chain.
1583 virtual void accept(ir_visitor
*v
)
1588 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1591 * Object being dereferenced.
1597 class ir_dereference_array
: public ir_dereference
{
1599 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1601 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1603 virtual ir_dereference_array
*clone(void *mem_ctx
,
1604 struct hash_table
*) const;
1606 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1608 virtual ir_dereference_array
*as_dereference_array()
1614 * Get the variable that is ultimately referenced by an r-value
1616 virtual ir_variable
*variable_referenced() const
1618 return this->array
->variable_referenced();
1622 * Get the constant that is ultimately referenced by an r-value,
1623 * in a constant expression evaluation context.
1625 * The offset is used when the reference is to a specific column of
1628 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1630 virtual void accept(ir_visitor
*v
)
1635 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1638 ir_rvalue
*array_index
;
1641 void set_array(ir_rvalue
*value
);
1645 class ir_dereference_record
: public ir_dereference
{
1647 ir_dereference_record(ir_rvalue
*value
, const char *field
);
1649 ir_dereference_record(ir_variable
*var
, const char *field
);
1651 virtual ir_dereference_record
*clone(void *mem_ctx
,
1652 struct hash_table
*) const;
1654 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1657 * Get the variable that is ultimately referenced by an r-value
1659 virtual ir_variable
*variable_referenced() const
1661 return this->record
->variable_referenced();
1665 * Get the constant that is ultimately referenced by an r-value,
1666 * in a constant expression evaluation context.
1668 * The offset is used when the reference is to a specific column of
1671 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1673 virtual void accept(ir_visitor
*v
)
1678 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1686 * Data stored in an ir_constant
1688 union ir_constant_data
{
1696 class ir_constant
: public ir_rvalue
{
1698 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
1699 ir_constant(bool b
);
1700 ir_constant(unsigned int u
);
1702 ir_constant(float f
);
1705 * Construct an ir_constant from a list of ir_constant values
1707 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
1710 * Construct an ir_constant from a scalar component of another ir_constant
1712 * The new \c ir_constant inherits the type of the component from the
1716 * In the case of a matrix constant, the new constant is a scalar, \b not
1719 ir_constant(const ir_constant
*c
, unsigned i
);
1722 * Return a new ir_constant of the specified type containing all zeros.
1724 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
1726 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
1728 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1730 virtual ir_constant
*as_constant()
1735 virtual void accept(ir_visitor
*v
)
1740 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1743 * Get a particular component of a constant as a specific type
1745 * This is useful, for example, to get a value from an integer constant
1746 * as a float or bool. This appears frequently when constructors are
1747 * called with all constant parameters.
1750 bool get_bool_component(unsigned i
) const;
1751 float get_float_component(unsigned i
) const;
1752 int get_int_component(unsigned i
) const;
1753 unsigned get_uint_component(unsigned i
) const;
1756 ir_constant
*get_array_element(unsigned i
) const;
1758 ir_constant
*get_record_field(const char *name
);
1761 * Copy the values on another constant at a given offset.
1763 * The offset is ignored for array or struct copies, it's only for
1764 * scalars or vectors into vectors or matrices.
1766 * With identical types on both sides and zero offset it's clone()
1767 * without creating a new object.
1770 void copy_offset(ir_constant
*src
, int offset
);
1773 * Copy the values on another constant at a given offset and
1774 * following an assign-like mask.
1776 * The mask is ignored for scalars.
1778 * Note that this function only handles what assign can handle,
1779 * i.e. at most a vector as source and a column of a matrix as
1783 void copy_masked_offset(ir_constant
*src
, int offset
, unsigned int mask
);
1786 * Determine whether a constant has the same value as another constant
1788 * \sa ir_constant::is_zero, ir_constant::is_one,
1789 * ir_constant::is_negative_one, ir_constant::is_basis
1791 bool has_value(const ir_constant
*) const;
1793 virtual bool is_zero() const;
1794 virtual bool is_one() const;
1795 virtual bool is_negative_one() const;
1796 virtual bool is_basis() const;
1799 * Value of the constant.
1801 * The field used to back the values supplied by the constant is determined
1802 * by the type associated with the \c ir_instruction. Constants may be
1803 * scalars, vectors, or matrices.
1805 union ir_constant_data value
;
1807 /* Array elements */
1808 ir_constant
**array_elements
;
1810 /* Structure fields */
1811 exec_list components
;
1815 * Parameterless constructor only used by the clone method
1823 * Apply a visitor to each IR node in a list
1826 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
1829 * Validate invariants on each IR node in a list
1831 void validate_ir_tree(exec_list
*instructions
);
1833 struct _mesa_glsl_parse_state
;
1834 struct gl_shader_program
;
1837 * Detect whether an unlinked shader contains static recursion
1839 * If the list of instructions is determined to contain static recursion,
1840 * \c _mesa_glsl_error will be called to emit error messages for each function
1841 * that is in the recursion cycle.
1844 detect_recursion_unlinked(struct _mesa_glsl_parse_state
*state
,
1845 exec_list
*instructions
);
1848 * Detect whether a linked shader contains static recursion
1850 * If the list of instructions is determined to contain static recursion,
1851 * \c link_error_printf will be called to emit error messages for each function
1852 * that is in the recursion cycle. In addition,
1853 * \c gl_shader_program::LinkStatus will be set to false.
1856 detect_recursion_linked(struct gl_shader_program
*prog
,
1857 exec_list
*instructions
);
1860 * Make a clone of each IR instruction in a list
1862 * \param in List of IR instructions that are to be cloned
1863 * \param out List to hold the cloned instructions
1866 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
1869 _mesa_glsl_initialize_variables(exec_list
*instructions
,
1870 struct _mesa_glsl_parse_state
*state
);
1873 _mesa_glsl_initialize_functions(_mesa_glsl_parse_state
*state
);
1876 _mesa_glsl_release_functions(void);
1879 reparent_ir(exec_list
*list
, void *mem_ctx
);
1881 struct glsl_symbol_table
;
1884 import_prototypes(const exec_list
*source
, exec_list
*dest
,
1885 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
1888 ir_has_call(ir_instruction
*ir
);
1891 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
,
1892 bool is_fragment_shader
);
1895 prototype_string(const glsl_type
*return_type
, const char *name
,
1896 exec_list
*parameters
);