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22 * DEALINGS IN THE SOFTWARE.
32 #include "util/ralloc.h"
33 #include "compiler/glsl_types.h"
35 #include "ir_visitor.h"
36 #include "ir_hierarchical_visitor.h"
37 #include "main/mtypes.h"
42 * \defgroup IR Intermediate representation nodes
50 * Each concrete class derived from \c ir_instruction has a value in this
51 * enumerant. The value for the type is stored in \c ir_instruction::ir_type
52 * by the constructor. While using type tags is not very C++, it is extremely
53 * convenient. For example, during debugging you can simply inspect
54 * \c ir_instruction::ir_type to find out the actual type of the object.
56 * In addition, it is possible to use a switch-statement based on \c
57 * \c ir_instruction::ir_type to select different behavior for different object
58 * types. For functions that have only slight differences for several object
59 * types, this allows writing very straightforward, readable code.
62 ir_type_dereference_array
,
63 ir_type_dereference_record
,
64 ir_type_dereference_variable
,
73 ir_type_function_signature
,
80 ir_type_end_primitive
,
82 ir_type_max
, /**< maximum ir_type enum number, for validation */
83 ir_type_unset
= ir_type_max
88 * Base class of all IR instructions
90 class ir_instruction
: public exec_node
{
92 enum ir_node_type ir_type
;
95 * GCC 4.7+ and clang warn when deleting an ir_instruction unless
96 * there's a virtual destructor present. Because we almost
97 * universally use ralloc for our memory management of
98 * ir_instructions, the destructor doesn't need to do any work.
100 virtual ~ir_instruction()
104 /** ir_print_visitor helper for debugging. */
105 void print(void) const;
106 void fprint(FILE *f
) const;
108 virtual void accept(ir_visitor
*) = 0;
109 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
110 virtual ir_instruction
*clone(void *mem_ctx
,
111 struct hash_table
*ht
) const = 0;
113 bool is_rvalue() const
115 return ir_type
== ir_type_dereference_array
||
116 ir_type
== ir_type_dereference_record
||
117 ir_type
== ir_type_dereference_variable
||
118 ir_type
== ir_type_constant
||
119 ir_type
== ir_type_expression
||
120 ir_type
== ir_type_swizzle
||
121 ir_type
== ir_type_texture
;
124 bool is_dereference() const
126 return ir_type
== ir_type_dereference_array
||
127 ir_type
== ir_type_dereference_record
||
128 ir_type
== ir_type_dereference_variable
;
133 return ir_type
== ir_type_loop_jump
||
134 ir_type
== ir_type_return
||
135 ir_type
== ir_type_discard
;
139 * \name IR instruction downcast functions
141 * These functions either cast the object to a derived class or return
142 * \c NULL if the object's type does not match the specified derived class.
143 * Additional downcast functions will be added as needed.
146 #define AS_BASE(TYPE) \
147 class ir_##TYPE *as_##TYPE() \
149 assume(this != NULL); \
150 return is_##TYPE() ? (ir_##TYPE *) this : NULL; \
152 const class ir_##TYPE *as_##TYPE() const \
154 assume(this != NULL); \
155 return is_##TYPE() ? (ir_##TYPE *) this : NULL; \
163 #define AS_CHILD(TYPE) \
164 class ir_##TYPE * as_##TYPE() \
166 assume(this != NULL); \
167 return ir_type == ir_type_##TYPE ? (ir_##TYPE *) this : NULL; \
169 const class ir_##TYPE * as_##TYPE() const \
171 assume(this != NULL); \
172 return ir_type == ir_type_##TYPE ? (const ir_##TYPE *) this : NULL; \
176 AS_CHILD(dereference_array
)
177 AS_CHILD(dereference_variable
)
178 AS_CHILD(dereference_record
)
193 * IR equality method: Return true if the referenced instruction would
194 * return the same value as this one.
196 * This intended to be used for CSE and algebraic optimizations, on rvalues
197 * in particular. No support for other instruction types (assignments,
198 * jumps, calls, etc.) is planned.
200 virtual bool equals(const ir_instruction
*ir
,
201 enum ir_node_type ignore
= ir_type_unset
) const;
204 ir_instruction(enum ir_node_type t
)
212 assert(!"Should not get here.");
218 * The base class for all "values"/expression trees.
220 class ir_rvalue
: public ir_instruction
{
222 const struct glsl_type
*type
;
224 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const;
226 virtual void accept(ir_visitor
*v
)
231 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
233 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
235 ir_rvalue
*as_rvalue_to_saturate();
237 virtual bool is_lvalue() const
243 * Get the variable that is ultimately referenced by an r-value
245 virtual ir_variable
*variable_referenced() const
252 * If an r-value is a reference to a whole variable, get that variable
255 * Pointer to a variable that is completely dereferenced by the r-value. If
256 * the r-value is not a dereference or the dereference does not access the
257 * entire variable (i.e., it's just one array element, struct field), \c NULL
260 virtual ir_variable
*whole_variable_referenced()
266 * Determine if an r-value has the value zero
268 * The base implementation of this function always returns \c false. The
269 * \c ir_constant class over-rides this function to return \c true \b only
270 * for vector and scalar types that have all elements set to the value
271 * zero (or \c false for booleans).
273 * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one
275 virtual bool is_zero() const;
278 * Determine if an r-value has the value one
280 * The base implementation of this function always returns \c false. The
281 * \c ir_constant class over-rides this function to return \c true \b only
282 * for vector and scalar types that have all elements set to the value
283 * one (or \c true for booleans).
285 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one
287 virtual bool is_one() const;
290 * Determine if an r-value has the value negative one
292 * The base implementation of this function always returns \c false. The
293 * \c ir_constant class over-rides this function to return \c true \b only
294 * for vector and scalar types that have all elements set to the value
295 * negative one. For boolean types, the result is always \c false.
297 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one
299 virtual bool is_negative_one() const;
302 * Determine if an r-value is an unsigned integer constant which can be
305 * \sa ir_constant::is_uint16_constant.
307 virtual bool is_uint16_constant() const { return false; }
310 * Return a generic value of error_type.
312 * Allocation will be performed with 'mem_ctx' as ralloc owner.
314 static ir_rvalue
*error_value(void *mem_ctx
);
317 ir_rvalue(enum ir_node_type t
);
322 * Variable storage classes
324 enum ir_variable_mode
{
325 ir_var_auto
= 0, /**< Function local variables and globals. */
326 ir_var_uniform
, /**< Variable declared as a uniform. */
327 ir_var_shader_storage
, /**< Variable declared as an ssbo. */
328 ir_var_shader_shared
, /**< Variable declared as shared. */
333 ir_var_function_inout
,
334 ir_var_const_in
, /**< "in" param that must be a constant expression */
335 ir_var_system_value
, /**< Ex: front-face, instance-id, etc. */
336 ir_var_temporary
, /**< Temporary variable generated during compilation. */
337 ir_var_mode_count
/**< Number of variable modes */
341 * Enum keeping track of how a variable was declared. For error checking of
342 * the gl_PerVertex redeclaration rules.
344 enum ir_var_declaration_type
{
346 * Normal declaration (for most variables, this means an explicit
347 * declaration. Exception: temporaries are always implicitly declared, but
348 * they still use ir_var_declared_normally).
350 * Note: an ir_variable that represents a named interface block uses
351 * ir_var_declared_normally.
353 ir_var_declared_normally
= 0,
356 * Variable was explicitly declared (or re-declared) in an unnamed
359 ir_var_declared_in_block
,
362 * Variable is an implicitly declared built-in that has not been explicitly
363 * re-declared by the shader.
365 ir_var_declared_implicitly
,
368 * Variable is implicitly generated by the compiler and should not be
369 * visible via the API.
375 * \brief Layout qualifiers for gl_FragDepth.
377 * The AMD/ARB_conservative_depth extensions allow gl_FragDepth to be redeclared
378 * with a layout qualifier.
380 enum ir_depth_layout
{
381 ir_depth_layout_none
, /**< No depth layout is specified. */
383 ir_depth_layout_greater
,
384 ir_depth_layout_less
,
385 ir_depth_layout_unchanged
389 * \brief Convert depth layout qualifier to string.
392 depth_layout_string(ir_depth_layout layout
);
395 * Description of built-in state associated with a uniform
397 * \sa ir_variable::state_slots
399 struct ir_state_slot
{
406 * Get the string value for an interpolation qualifier
408 * \return The string that would be used in a shader to specify \c
409 * mode will be returned.
411 * This function is used to generate error messages of the form "shader
412 * uses %s interpolation qualifier", so in the case where there is no
413 * interpolation qualifier, it returns "no".
415 * This function should only be used on a shader input or output variable.
417 const char *interpolation_string(unsigned interpolation
);
420 class ir_variable
: public ir_instruction
{
422 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
424 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
426 virtual void accept(ir_visitor
*v
)
431 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
435 * Determine whether or not a variable is part of a uniform or
436 * shader storage block.
438 inline bool is_in_buffer_block() const
440 return (this->data
.mode
== ir_var_uniform
||
441 this->data
.mode
== ir_var_shader_storage
) &&
442 this->interface_type
!= NULL
;
446 * Determine whether or not a variable is part of a shader storage block.
448 inline bool is_in_shader_storage_block() const
450 return this->data
.mode
== ir_var_shader_storage
&&
451 this->interface_type
!= NULL
;
455 * Determine whether or not a variable is the declaration of an interface
458 * For the first declaration below, there will be an \c ir_variable named
459 * "instance" whose type and whose instance_type will be the same
460 * \cglsl_type. For the second declaration, there will be an \c ir_variable
461 * named "f" whose type is float and whose instance_type is B2.
463 * "instance" is an interface instance variable, but "f" is not.
473 inline bool is_interface_instance() const
475 return this->type
->without_array() == this->interface_type
;
479 * Set this->interface_type on a newly created variable.
481 void init_interface_type(const struct glsl_type
*type
)
483 assert(this->interface_type
== NULL
);
484 this->interface_type
= type
;
485 if (this->is_interface_instance()) {
486 this->u
.max_ifc_array_access
=
487 ralloc_array(this, int, type
->length
);
488 for (unsigned i
= 0; i
< type
->length
; i
++) {
489 this->u
.max_ifc_array_access
[i
] = -1;
495 * Change this->interface_type on a variable that previously had a
496 * different, but compatible, interface_type. This is used during linking
497 * to set the size of arrays in interface blocks.
499 void change_interface_type(const struct glsl_type
*type
)
501 if (this->u
.max_ifc_array_access
!= NULL
) {
502 /* max_ifc_array_access has already been allocated, so make sure the
503 * new interface has the same number of fields as the old one.
505 assert(this->interface_type
->length
== type
->length
);
507 this->interface_type
= type
;
511 * Change this->interface_type on a variable that previously had a
512 * different, and incompatible, interface_type. This is used during
513 * compilation to handle redeclaration of the built-in gl_PerVertex
516 void reinit_interface_type(const struct glsl_type
*type
)
518 if (this->u
.max_ifc_array_access
!= NULL
) {
520 /* Redeclaring gl_PerVertex is only allowed if none of the built-ins
521 * it defines have been accessed yet; so it's safe to throw away the
522 * old max_ifc_array_access pointer, since all of its values are
525 for (unsigned i
= 0; i
< this->interface_type
->length
; i
++)
526 assert(this->u
.max_ifc_array_access
[i
] == -1);
528 ralloc_free(this->u
.max_ifc_array_access
);
529 this->u
.max_ifc_array_access
= NULL
;
531 this->interface_type
= NULL
;
532 init_interface_type(type
);
535 const glsl_type
*get_interface_type() const
537 return this->interface_type
;
540 enum glsl_interface_packing
get_interface_type_packing() const
542 return this->interface_type
->get_interface_packing();
545 * Get the max_ifc_array_access pointer
547 * A "set" function is not needed because the array is dynmically allocated
550 inline int *get_max_ifc_array_access()
552 assert(this->data
._num_state_slots
== 0);
553 return this->u
.max_ifc_array_access
;
556 inline unsigned get_num_state_slots() const
558 assert(!this->is_interface_instance()
559 || this->data
._num_state_slots
== 0);
560 return this->data
._num_state_slots
;
563 inline void set_num_state_slots(unsigned n
)
565 assert(!this->is_interface_instance()
567 this->data
._num_state_slots
= n
;
570 inline ir_state_slot
*get_state_slots()
572 return this->is_interface_instance() ? NULL
: this->u
.state_slots
;
575 inline const ir_state_slot
*get_state_slots() const
577 return this->is_interface_instance() ? NULL
: this->u
.state_slots
;
580 inline ir_state_slot
*allocate_state_slots(unsigned n
)
582 assert(!this->is_interface_instance());
584 this->u
.state_slots
= ralloc_array(this, ir_state_slot
, n
);
585 this->data
._num_state_slots
= 0;
587 if (this->u
.state_slots
!= NULL
)
588 this->data
._num_state_slots
= n
;
590 return this->u
.state_slots
;
593 inline bool is_name_ralloced() const
595 return this->name
!= ir_variable::tmp_name
;
599 * Enable emitting extension warnings for this variable
601 void enable_extension_warning(const char *extension
);
604 * Get the extension warning string for this variable
606 * If warnings are not enabled, \c NULL is returned.
608 const char *get_extension_warning() const;
611 * Declared type of the variable
613 const struct glsl_type
*type
;
616 * Declared name of the variable
620 struct ir_variable_data
{
623 * Is the variable read-only?
625 * This is set for variables declared as \c const, shader inputs,
628 unsigned read_only
:1;
632 unsigned invariant
:1;
636 * Has this variable been used for reading or writing?
638 * Several GLSL semantic checks require knowledge of whether or not a
639 * variable has been used. For example, it is an error to redeclare a
640 * variable as invariant after it has been used.
642 * This is only maintained in the ast_to_hir.cpp path, not in
643 * Mesa's fixed function or ARB program paths.
648 * Has this variable been statically assigned?
650 * This answers whether the variable was assigned in any path of
651 * the shader during ast_to_hir. This doesn't answer whether it is
652 * still written after dead code removal, nor is it maintained in
653 * non-ast_to_hir.cpp (GLSL parsing) paths.
658 * When separate shader programs are enabled, only input/outputs between
659 * the stages of a multi-stage separate program can be safely removed
660 * from the shader interface. Other input/outputs must remains active.
662 unsigned always_active_io
:1;
665 * Enum indicating how the variable was declared. See
666 * ir_var_declaration_type.
668 * This is used to detect certain kinds of illegal variable redeclarations.
670 unsigned how_declared
:2;
673 * Storage class of the variable.
675 * \sa ir_variable_mode
680 * Interpolation mode for shader inputs / outputs
682 * \sa glsl_interp_qualifier
684 unsigned interpolation
:2;
687 * \name ARB_fragment_coord_conventions
690 unsigned origin_upper_left
:1;
691 unsigned pixel_center_integer
:1;
695 * Was the location explicitly set in the shader?
697 * If the location is explicitly set in the shader, it \b cannot be changed
698 * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
701 unsigned explicit_location
:1;
702 unsigned explicit_index
:1;
705 * Was an initial binding explicitly set in the shader?
707 * If so, constant_value contains an integer ir_constant representing the
708 * initial binding point.
710 unsigned explicit_binding
:1;
713 * Was an initial component explicitly set in the shader?
715 unsigned explicit_component
:1;
718 * Does this variable have an initializer?
720 * This is used by the linker to cross-validiate initializers of global
723 unsigned has_initializer
:1;
726 * Is this variable a generic output or input that has not yet been matched
727 * up to a variable in another stage of the pipeline?
729 * This is used by the linker as scratch storage while assigning locations
730 * to generic inputs and outputs.
732 unsigned is_unmatched_generic_inout
:1;
735 * Is this varying used only by transform feedback?
737 * This is used by the linker to decide if its safe to pack the varying.
739 unsigned is_xfb_only
:1;
742 * Was a transfor feedback buffer set in the shader?
744 unsigned explicit_xfb_buffer
:1;
747 * Was a transfor feedback offset set in the shader?
749 unsigned explicit_xfb_offset
:1;
752 * Was a transfor feedback stride set in the shader?
754 unsigned explicit_xfb_stride
:1;
757 * If non-zero, then this variable may be packed along with other variables
758 * into a single varying slot, so this offset should be applied when
759 * accessing components. For example, an offset of 1 means that the x
760 * component of this variable is actually stored in component y of the
761 * location specified by \c location.
763 unsigned location_frac
:2;
766 * Layout of the matrix. Uses glsl_matrix_layout values.
768 unsigned matrix_layout
:2;
771 * Non-zero if this variable was created by lowering a named interface
774 unsigned from_named_ifc_block
:1;
777 * Non-zero if the variable must be a shader input. This is useful for
778 * constraints on function parameters.
780 unsigned must_be_shader_input
:1;
783 * Output index for dual source blending.
786 * The GLSL spec only allows the values 0 or 1 for the index in \b dual
792 * Precision qualifier.
794 * In desktop GLSL we do not care about precision qualifiers at all, in
795 * fact, the spec says that precision qualifiers are ignored.
797 * To make things easy, we make it so that this field is always
798 * GLSL_PRECISION_NONE on desktop shaders. This way all the variables
799 * have the same precision value and the checks we add in the compiler
800 * for this field will never break a desktop shader compile.
802 unsigned precision
:2;
805 * \brief Layout qualifier for gl_FragDepth.
807 * This is not equal to \c ir_depth_layout_none if and only if this
808 * variable is \c gl_FragDepth and a layout qualifier is specified.
810 ir_depth_layout depth_layout
:3;
813 * ARB_shader_image_load_store qualifiers.
815 unsigned image_read_only
:1; /**< "readonly" qualifier. */
816 unsigned image_write_only
:1; /**< "writeonly" qualifier. */
817 unsigned image_coherent
:1;
818 unsigned image_volatile
:1;
819 unsigned image_restrict
:1;
822 * ARB_shader_storage_buffer_object
824 unsigned from_ssbo_unsized_array
:1; /**< unsized array buffer variable. */
826 unsigned implicit_sized_array
:1;
828 * Emit a warning if this variable is accessed.
831 uint8_t warn_extension_index
;
834 /** Image internal format if specified explicitly, otherwise GL_NONE. */
835 uint16_t image_format
;
839 * Number of state slots used
842 * This could be stored in as few as 7-bits, if necessary. If it is made
843 * smaller, add an assertion to \c ir_variable::allocate_state_slots to
846 uint16_t _num_state_slots
;
850 * Initial binding point for a sampler, atomic, or UBO.
852 * For array types, this represents the binding point for the first element.
857 * Storage location of the base of this variable
859 * The precise meaning of this field depends on the nature of the variable.
861 * - Vertex shader input: one of the values from \c gl_vert_attrib.
862 * - Vertex shader output: one of the values from \c gl_varying_slot.
863 * - Geometry shader input: one of the values from \c gl_varying_slot.
864 * - Geometry shader output: one of the values from \c gl_varying_slot.
865 * - Fragment shader input: one of the values from \c gl_varying_slot.
866 * - Fragment shader output: one of the values from \c gl_frag_result.
867 * - Uniforms: Per-stage uniform slot number for default uniform block.
868 * - Uniforms: Index within the uniform block definition for UBO members.
869 * - Non-UBO Uniforms: explicit location until linking then reused to
870 * store uniform slot number.
871 * - Other: This field is not currently used.
873 * If the variable is a uniform, shader input, or shader output, and the
874 * slot has not been assigned, the value will be -1.
879 * for glsl->tgsi/mesa IR we need to store the index into the
880 * parameters for uniforms, initially the code overloaded location
881 * but this causes problems with indirect samplers and AoA.
882 * This is assigned in _mesa_generate_parameters_list_for_uniforms.
887 * Vertex stream output identifier.
892 * Atomic, transform feedback or block member offset.
897 * Highest element accessed with a constant expression array index
899 * Not used for non-array variables. -1 is never accessed.
901 int max_array_access
;
904 * Transform feedback buffer.
909 * Transform feedback stride.
914 * Allow (only) ir_variable direct access private members.
916 friend class ir_variable
;
920 * Value assigned in the initializer of a variable declared "const"
922 ir_constant
*constant_value
;
925 * Constant expression assigned in the initializer of the variable
928 * This field and \c ::constant_value are distinct. Even if the two fields
929 * refer to constants with the same value, they must point to separate
932 ir_constant
*constant_initializer
;
935 static const char *const warn_extension_table
[];
939 * For variables which satisfy the is_interface_instance() predicate,
940 * this points to an array of integers such that if the ith member of
941 * the interface block is an array, max_ifc_array_access[i] is the
942 * maximum array element of that member that has been accessed. If the
943 * ith member of the interface block is not an array,
944 * max_ifc_array_access[i] is unused.
946 * For variables whose type is not an interface block, this pointer is
949 int *max_ifc_array_access
;
952 * Built-in state that backs this uniform
954 * Once set at variable creation, \c state_slots must remain invariant.
956 * If the variable is not a uniform, \c _num_state_slots will be zero
957 * and \c state_slots will be \c NULL.
959 ir_state_slot
*state_slots
;
963 * For variables that are in an interface block or are an instance of an
964 * interface block, this is the \c GLSL_TYPE_INTERFACE type for that block.
966 * \sa ir_variable::location
968 const glsl_type
*interface_type
;
971 * Name used for anonymous compiler temporaries
973 static const char tmp_name
[];
977 * Should the construct keep names for ir_var_temporary variables?
979 * When this global is false, names passed to the constructor for
980 * \c ir_var_temporary variables will be dropped. Instead, the variable will
981 * be named "compiler_temp". This name will be in static storage.
984 * \b NEVER change the mode of an \c ir_var_temporary.
987 * This variable is \b not thread-safe. It is global, \b not
988 * per-context. It begins life false. A context can, at some point, make
989 * it true. From that point on, it will be true forever. This should be
990 * okay since it will only be set true while debugging.
992 static bool temporaries_allocate_names
;
996 * A function that returns whether a built-in function is available in the
997 * current shading language (based on version, ES or desktop, and extensions).
999 typedef bool (*builtin_available_predicate
)(const _mesa_glsl_parse_state
*);
1003 * The representation of a function instance; may be the full definition or
1004 * simply a prototype.
1006 class ir_function_signature
: public ir_instruction
{
1007 /* An ir_function_signature will be part of the list of signatures in
1011 ir_function_signature(const glsl_type
*return_type
,
1012 builtin_available_predicate builtin_avail
= NULL
);
1014 virtual ir_function_signature
*clone(void *mem_ctx
,
1015 struct hash_table
*ht
) const;
1016 ir_function_signature
*clone_prototype(void *mem_ctx
,
1017 struct hash_table
*ht
) const;
1019 virtual void accept(ir_visitor
*v
)
1024 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1027 * Attempt to evaluate this function as a constant expression,
1028 * given a list of the actual parameters and the variable context.
1029 * Returns NULL for non-built-ins.
1031 ir_constant
*constant_expression_value(exec_list
*actual_parameters
, struct hash_table
*variable_context
);
1034 * Get the name of the function for which this is a signature
1036 const char *function_name() const;
1039 * Get a handle to the function for which this is a signature
1041 * There is no setter function, this function returns a \c const pointer,
1042 * and \c ir_function_signature::_function is private for a reason. The
1043 * only way to make a connection between a function and function signature
1044 * is via \c ir_function::add_signature. This helps ensure that certain
1045 * invariants (i.e., a function signature is in the list of signatures for
1046 * its \c _function) are met.
1048 * \sa ir_function::add_signature
1050 inline const class ir_function
*function() const
1052 return this->_function
;
1056 * Check whether the qualifiers match between this signature's parameters
1057 * and the supplied parameter list. If not, returns the name of the first
1058 * parameter with mismatched qualifiers (for use in error messages).
1060 const char *qualifiers_match(exec_list
*params
);
1063 * Replace the current parameter list with the given one. This is useful
1064 * if the current information came from a prototype, and either has invalid
1065 * or missing parameter names.
1067 void replace_parameters(exec_list
*new_params
);
1070 * Function return type.
1072 * \note This discards the optional precision qualifier.
1074 const struct glsl_type
*return_type
;
1077 * List of ir_variable of function parameters.
1079 * This represents the storage. The paramaters passed in a particular
1080 * call will be in ir_call::actual_paramaters.
1082 struct exec_list parameters
;
1084 /** Whether or not this function has a body (which may be empty). */
1085 unsigned is_defined
:1;
1087 /** Whether or not this function signature is a built-in. */
1088 bool is_builtin() const;
1091 * Whether or not this function is an intrinsic to be implemented
1096 /** Whether or not a built-in is available for this shader. */
1097 bool is_builtin_available(const _mesa_glsl_parse_state
*state
) const;
1099 /** Body of instructions in the function. */
1100 struct exec_list body
;
1104 * A function pointer to a predicate that answers whether a built-in
1105 * function is available in the current shader. NULL if not a built-in.
1107 builtin_available_predicate builtin_avail
;
1109 /** Function of which this signature is one overload. */
1110 class ir_function
*_function
;
1112 /** Function signature of which this one is a prototype clone */
1113 const ir_function_signature
*origin
;
1115 friend class ir_function
;
1118 * Helper function to run a list of instructions for constant
1119 * expression evaluation.
1121 * The hash table represents the values of the visible variables.
1122 * There are no scoping issues because the table is indexed on
1123 * ir_variable pointers, not variable names.
1125 * Returns false if the expression is not constant, true otherwise,
1126 * and the value in *result if result is non-NULL.
1128 bool constant_expression_evaluate_expression_list(const struct exec_list
&body
,
1129 struct hash_table
*variable_context
,
1130 ir_constant
**result
);
1135 * Header for tracking multiple overloaded functions with the same name.
1136 * Contains a list of ir_function_signatures representing each of the
1139 class ir_function
: public ir_instruction
{
1141 ir_function(const char *name
);
1143 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1145 virtual void accept(ir_visitor
*v
)
1150 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1152 void add_signature(ir_function_signature
*sig
)
1154 sig
->_function
= this;
1155 this->signatures
.push_tail(sig
);
1159 * Find a signature that matches a set of actual parameters, taking implicit
1160 * conversions into account. Also flags whether the match was exact.
1162 ir_function_signature
*matching_signature(_mesa_glsl_parse_state
*state
,
1163 const exec_list
*actual_param
,
1164 bool allow_builtins
,
1165 bool *match_is_exact
);
1168 * Find a signature that matches a set of actual parameters, taking implicit
1169 * conversions into account.
1171 ir_function_signature
*matching_signature(_mesa_glsl_parse_state
*state
,
1172 const exec_list
*actual_param
,
1173 bool allow_builtins
);
1176 * Find a signature that exactly matches a set of actual parameters without
1177 * any implicit type conversions.
1179 ir_function_signature
*exact_matching_signature(_mesa_glsl_parse_state
*state
,
1180 const exec_list
*actual_ps
);
1183 * Name of the function.
1187 /** Whether or not this function has a signature that isn't a built-in. */
1188 bool has_user_signature();
1191 * List of ir_function_signature for each overloaded function with this name.
1193 struct exec_list signatures
;
1196 * is this function a subroutine type declaration
1197 * e.g. subroutine void type1(float arg1);
1202 * is this function associated to a subroutine type
1203 * e.g. subroutine (type1, type2) function_name { function_body };
1204 * would have num_subroutine_types 2,
1205 * and pointers to the type1 and type2 types.
1207 int num_subroutine_types
;
1208 const struct glsl_type
**subroutine_types
;
1210 int subroutine_index
;
1213 inline const char *ir_function_signature::function_name() const
1215 return this->_function
->name
;
1221 * IR instruction representing high-level if-statements
1223 class ir_if
: public ir_instruction
{
1225 ir_if(ir_rvalue
*condition
)
1226 : ir_instruction(ir_type_if
), condition(condition
)
1230 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1232 virtual void accept(ir_visitor
*v
)
1237 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1239 ir_rvalue
*condition
;
1240 /** List of ir_instruction for the body of the then branch */
1241 exec_list then_instructions
;
1242 /** List of ir_instruction for the body of the else branch */
1243 exec_list else_instructions
;
1248 * IR instruction representing a high-level loop structure.
1250 class ir_loop
: public ir_instruction
{
1254 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1256 virtual void accept(ir_visitor
*v
)
1261 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1263 /** List of ir_instruction that make up the body of the loop. */
1264 exec_list body_instructions
;
1268 class ir_assignment
: public ir_instruction
{
1270 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
= NULL
);
1273 * Construct an assignment with an explicit write mask
1276 * Since a write mask is supplied, the LHS must already be a bare
1277 * \c ir_dereference. The cannot be any swizzles in the LHS.
1279 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
1280 unsigned write_mask
);
1282 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1284 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1286 virtual void accept(ir_visitor
*v
)
1291 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1294 * Get a whole variable written by an assignment
1296 * If the LHS of the assignment writes a whole variable, the variable is
1297 * returned. Otherwise \c NULL is returned. Examples of whole-variable
1300 * - Assigning to a scalar
1301 * - Assigning to all components of a vector
1302 * - Whole array (or matrix) assignment
1303 * - Whole structure assignment
1305 ir_variable
*whole_variable_written();
1308 * Set the LHS of an assignment
1310 void set_lhs(ir_rvalue
*lhs
);
1313 * Left-hand side of the assignment.
1315 * This should be treated as read only. If you need to set the LHS of an
1316 * assignment, use \c ir_assignment::set_lhs.
1318 ir_dereference
*lhs
;
1321 * Value being assigned
1326 * Optional condition for the assignment.
1328 ir_rvalue
*condition
;
1332 * Component mask written
1334 * For non-vector types in the LHS, this field will be zero. For vector
1335 * types, a bit will be set for each component that is written. Note that
1336 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
1338 * A partially-set write mask means that each enabled channel gets
1339 * the value from a consecutive channel of the rhs. For example,
1340 * to write just .xyw of gl_FrontColor with color:
1342 * (assign (constant bool (1)) (xyw)
1343 * (var_ref gl_FragColor)
1344 * (swiz xyw (var_ref color)))
1346 unsigned write_mask
:4;
1349 /* Update ir_expression::get_num_operands() and operator_strs when
1350 * updating this list.
1352 enum ir_expression_operation
{
1361 ir_unop_exp
, /**< Log base e on gentype */
1362 ir_unop_log
, /**< Natural log on gentype */
1365 ir_unop_f2i
, /**< Float-to-integer conversion. */
1366 ir_unop_f2u
, /**< Float-to-unsigned conversion. */
1367 ir_unop_i2f
, /**< Integer-to-float conversion. */
1368 ir_unop_f2b
, /**< Float-to-boolean conversion */
1369 ir_unop_b2f
, /**< Boolean-to-float conversion */
1370 ir_unop_i2b
, /**< int-to-boolean conversion */
1371 ir_unop_b2i
, /**< Boolean-to-int conversion */
1372 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
1373 ir_unop_i2u
, /**< Integer-to-unsigned conversion. */
1374 ir_unop_u2i
, /**< Unsigned-to-integer conversion. */
1375 ir_unop_d2f
, /**< Double-to-float conversion. */
1376 ir_unop_f2d
, /**< Float-to-double conversion. */
1377 ir_unop_d2i
, /**< Double-to-integer conversion. */
1378 ir_unop_i2d
, /**< Integer-to-double conversion. */
1379 ir_unop_d2u
, /**< Double-to-unsigned conversion. */
1380 ir_unop_u2d
, /**< Unsigned-to-double conversion. */
1381 ir_unop_d2b
, /**< Double-to-boolean conversion. */
1382 ir_unop_bitcast_i2f
, /**< Bit-identical int-to-float "conversion" */
1383 ir_unop_bitcast_f2i
, /**< Bit-identical float-to-int "conversion" */
1384 ir_unop_bitcast_u2f
, /**< Bit-identical uint-to-float "conversion" */
1385 ir_unop_bitcast_f2u
, /**< Bit-identical float-to-uint "conversion" */
1388 * \name Unary floating-point rounding operations.
1399 * \name Trigonometric operations.
1407 * \name Partial derivatives.
1411 ir_unop_dFdx_coarse
,
1414 ir_unop_dFdy_coarse
,
1419 * \name Floating point pack and unpack operations.
1422 ir_unop_pack_snorm_2x16
,
1423 ir_unop_pack_snorm_4x8
,
1424 ir_unop_pack_unorm_2x16
,
1425 ir_unop_pack_unorm_4x8
,
1426 ir_unop_pack_half_2x16
,
1427 ir_unop_unpack_snorm_2x16
,
1428 ir_unop_unpack_snorm_4x8
,
1429 ir_unop_unpack_unorm_2x16
,
1430 ir_unop_unpack_unorm_4x8
,
1431 ir_unop_unpack_half_2x16
,
1435 * \name Bit operations, part of ARB_gpu_shader5.
1438 ir_unop_bitfield_reverse
,
1447 * \name Double packing, part of ARB_gpu_shader_fp64.
1450 ir_unop_pack_double_2x32
,
1451 ir_unop_unpack_double_2x32
,
1459 ir_unop_subroutine_to_int
,
1461 * Interpolate fs input at centroid
1463 * operand0 is the fs input.
1465 ir_unop_interpolate_at_centroid
,
1468 * Ask the driver for the total size of a buffer block.
1470 * operand0 is the ir_constant buffer block index in the linked shader.
1472 ir_unop_get_buffer_size
,
1475 * Calculate length of an unsized array inside a buffer block.
1476 * This opcode is going to be replaced in a lowering pass inside
1479 * operand0 is the unsized array's ir_value for the calculation
1482 ir_unop_ssbo_unsized_array_length
,
1485 * Vote among threads on the value of the boolean argument.
1492 * A sentinel marking the last of the unary operations.
1494 ir_last_unop
= ir_unop_vote_eq
,
1498 ir_binop_mul
, /**< Floating-point or low 32-bit integer multiply. */
1499 ir_binop_imul_high
, /**< Calculates the high 32-bits of a 64-bit multiply. */
1503 * Returns the carry resulting from the addition of the two arguments.
1510 * Returns the borrow resulting from the subtraction of the second argument
1511 * from the first argument.
1518 * Takes one of two combinations of arguments:
1521 * - mod(vecN, float)
1523 * Does not take integer types.
1528 * \name Binary comparison operators which return a boolean vector.
1529 * The type of both operands must be equal.
1539 * Returns single boolean for whether all components of operands[0]
1540 * equal the components of operands[1].
1544 * Returns single boolean for whether any component of operands[0]
1545 * is not equal to the corresponding component of operands[1].
1547 ir_binop_any_nequal
,
1551 * \name Bit-wise binary operations.
1572 * Load a value the size of a given GLSL type from a uniform block.
1574 * operand0 is the ir_constant uniform block index in the linked shader.
1575 * operand1 is a byte offset within the uniform block.
1580 * \name Multiplies a number by two to a power, part of ARB_gpu_shader5.
1587 * Extract a scalar from a vector
1589 * operand0 is the vector
1590 * operand1 is the index of the field to read from operand0
1592 ir_binop_vector_extract
,
1595 * Interpolate fs input at offset
1597 * operand0 is the fs input
1598 * operand1 is the offset from the pixel center
1600 ir_binop_interpolate_at_offset
,
1603 * Interpolate fs input at sample position
1605 * operand0 is the fs input
1606 * operand1 is the sample ID
1608 ir_binop_interpolate_at_sample
,
1611 * A sentinel marking the last of the binary operations.
1613 ir_last_binop
= ir_binop_interpolate_at_sample
,
1616 * \name Fused floating-point multiply-add, part of ARB_gpu_shader5.
1625 * \name Conditional Select
1627 * A vector conditional select instruction (like ?:, but operating per-
1628 * component on vectors).
1630 * \see lower_instructions_visitor::ldexp_to_arith
1636 ir_triop_bitfield_extract
,
1639 * Generate a value with one field of a vector changed
1641 * operand0 is the vector
1642 * operand1 is the value to write into the vector result
1643 * operand2 is the index in operand0 to be modified
1645 ir_triop_vector_insert
,
1648 * A sentinel marking the last of the ternary operations.
1650 ir_last_triop
= ir_triop_vector_insert
,
1652 ir_quadop_bitfield_insert
,
1657 * A sentinel marking the last of the ternary operations.
1659 ir_last_quadop
= ir_quadop_vector
,
1662 * A sentinel marking the last of all operations.
1664 ir_last_opcode
= ir_quadop_vector
1667 class ir_expression
: public ir_rvalue
{
1669 ir_expression(int op
, const struct glsl_type
*type
,
1670 ir_rvalue
*op0
, ir_rvalue
*op1
= NULL
,
1671 ir_rvalue
*op2
= NULL
, ir_rvalue
*op3
= NULL
);
1674 * Constructor for unary operation expressions
1676 ir_expression(int op
, ir_rvalue
*);
1679 * Constructor for binary operation expressions
1681 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
);
1684 * Constructor for ternary operation expressions
1686 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
, ir_rvalue
*op2
);
1688 virtual bool equals(const ir_instruction
*ir
,
1689 enum ir_node_type ignore
= ir_type_unset
) const;
1691 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1694 * Attempt to constant-fold the expression
1696 * The "variable_context" hash table links ir_variable * to ir_constant *
1697 * that represent the variables' values. \c NULL represents an empty
1700 * If the expression cannot be constant folded, this method will return
1703 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1706 * Determine the number of operands used by an expression
1708 static unsigned int get_num_operands(ir_expression_operation
);
1711 * Determine the number of operands used by an expression
1713 unsigned int get_num_operands() const
1715 return (this->operation
== ir_quadop_vector
)
1716 ? this->type
->vector_elements
: get_num_operands(operation
);
1720 * Return whether the expression operates on vectors horizontally.
1722 bool is_horizontal() const
1724 return operation
== ir_binop_all_equal
||
1725 operation
== ir_binop_any_nequal
||
1726 operation
== ir_binop_dot
||
1727 operation
== ir_binop_vector_extract
||
1728 operation
== ir_triop_vector_insert
||
1729 operation
== ir_binop_ubo_load
||
1730 operation
== ir_quadop_vector
;
1734 * Return a string representing this expression's operator.
1736 const char *operator_string();
1739 * Return a string representing this expression's operator.
1741 static const char *operator_string(ir_expression_operation
);
1745 * Do a reverse-lookup to translate the given string into an operator.
1747 static ir_expression_operation
get_operator(const char *);
1749 virtual void accept(ir_visitor
*v
)
1754 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1756 virtual ir_variable
*variable_referenced() const;
1758 ir_expression_operation operation
;
1759 ir_rvalue
*operands
[4];
1764 * HIR instruction representing a high-level function call, containing a list
1765 * of parameters and returning a value in the supplied temporary.
1767 class ir_call
: public ir_instruction
{
1769 ir_call(ir_function_signature
*callee
,
1770 ir_dereference_variable
*return_deref
,
1771 exec_list
*actual_parameters
)
1772 : ir_instruction(ir_type_call
), return_deref(return_deref
), callee(callee
), sub_var(NULL
), array_idx(NULL
)
1774 assert(callee
->return_type
!= NULL
);
1775 actual_parameters
->move_nodes_to(& this->actual_parameters
);
1776 this->use_builtin
= callee
->is_builtin();
1779 ir_call(ir_function_signature
*callee
,
1780 ir_dereference_variable
*return_deref
,
1781 exec_list
*actual_parameters
,
1782 ir_variable
*var
, ir_rvalue
*array_idx
)
1783 : ir_instruction(ir_type_call
), return_deref(return_deref
), callee(callee
), sub_var(var
), array_idx(array_idx
)
1785 assert(callee
->return_type
!= NULL
);
1786 actual_parameters
->move_nodes_to(& this->actual_parameters
);
1787 this->use_builtin
= callee
->is_builtin();
1790 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1792 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1794 virtual void accept(ir_visitor
*v
)
1799 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1802 * Get the name of the function being called.
1804 const char *callee_name() const
1806 return callee
->function_name();
1810 * Generates an inline version of the function before @ir,
1811 * storing the return value in return_deref.
1813 void generate_inline(ir_instruction
*ir
);
1816 * Storage for the function's return value.
1817 * This must be NULL if the return type is void.
1819 ir_dereference_variable
*return_deref
;
1822 * The specific function signature being called.
1824 ir_function_signature
*callee
;
1826 /* List of ir_rvalue of paramaters passed in this call. */
1827 exec_list actual_parameters
;
1829 /** Should this call only bind to a built-in function? */
1833 * ARB_shader_subroutine support -
1834 * the subroutine uniform variable and array index
1835 * rvalue to be used in the lowering pass later.
1837 ir_variable
*sub_var
;
1838 ir_rvalue
*array_idx
;
1843 * \name Jump-like IR instructions.
1845 * These include \c break, \c continue, \c return, and \c discard.
1848 class ir_jump
: public ir_instruction
{
1850 ir_jump(enum ir_node_type t
)
1856 class ir_return
: public ir_jump
{
1859 : ir_jump(ir_type_return
), value(NULL
)
1863 ir_return(ir_rvalue
*value
)
1864 : ir_jump(ir_type_return
), value(value
)
1868 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
1870 ir_rvalue
*get_value() const
1875 virtual void accept(ir_visitor
*v
)
1880 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1887 * Jump instructions used inside loops
1889 * These include \c break and \c continue. The \c break within a loop is
1890 * different from the \c break within a switch-statement.
1892 * \sa ir_switch_jump
1894 class ir_loop_jump
: public ir_jump
{
1901 ir_loop_jump(jump_mode mode
)
1902 : ir_jump(ir_type_loop_jump
)
1907 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
1909 virtual void accept(ir_visitor
*v
)
1914 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1916 bool is_break() const
1918 return mode
== jump_break
;
1921 bool is_continue() const
1923 return mode
== jump_continue
;
1926 /** Mode selector for the jump instruction. */
1927 enum jump_mode mode
;
1931 * IR instruction representing discard statements.
1933 class ir_discard
: public ir_jump
{
1936 : ir_jump(ir_type_discard
)
1938 this->condition
= NULL
;
1941 ir_discard(ir_rvalue
*cond
)
1942 : ir_jump(ir_type_discard
)
1944 this->condition
= cond
;
1947 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1949 virtual void accept(ir_visitor
*v
)
1954 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1956 ir_rvalue
*condition
;
1962 * Texture sampling opcodes used in ir_texture
1964 enum ir_texture_opcode
{
1965 ir_tex
, /**< Regular texture look-up */
1966 ir_txb
, /**< Texture look-up with LOD bias */
1967 ir_txl
, /**< Texture look-up with explicit LOD */
1968 ir_txd
, /**< Texture look-up with partial derivatvies */
1969 ir_txf
, /**< Texel fetch with explicit LOD */
1970 ir_txf_ms
, /**< Multisample texture fetch */
1971 ir_txs
, /**< Texture size */
1972 ir_lod
, /**< Texture lod query */
1973 ir_tg4
, /**< Texture gather */
1974 ir_query_levels
, /**< Texture levels query */
1975 ir_texture_samples
, /**< Texture samples query */
1976 ir_samples_identical
, /**< Query whether all samples are definitely identical. */
1981 * IR instruction to sample a texture
1983 * The specific form of the IR instruction depends on the \c mode value
1984 * selected from \c ir_texture_opcodes. In the printed IR, these will
1987 * Texel offset (0 or an expression)
1988 * | Projection divisor
1989 * | | Shadow comparitor
1992 * (tex <type> <sampler> <coordinate> 0 1 ( ))
1993 * (txb <type> <sampler> <coordinate> 0 1 ( ) <bias>)
1994 * (txl <type> <sampler> <coordinate> 0 1 ( ) <lod>)
1995 * (txd <type> <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
1996 * (txf <type> <sampler> <coordinate> 0 <lod>)
1998 * <type> <sampler> <coordinate> <sample_index>)
1999 * (txs <type> <sampler> <lod>)
2000 * (lod <type> <sampler> <coordinate>)
2001 * (tg4 <type> <sampler> <coordinate> <offset> <component>)
2002 * (query_levels <type> <sampler>)
2003 * (samples_identical <sampler> <coordinate>)
2005 class ir_texture
: public ir_rvalue
{
2007 ir_texture(enum ir_texture_opcode op
)
2008 : ir_rvalue(ir_type_texture
),
2009 op(op
), sampler(NULL
), coordinate(NULL
), projector(NULL
),
2010 shadow_comparitor(NULL
), offset(NULL
)
2012 memset(&lod_info
, 0, sizeof(lod_info
));
2015 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
2017 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2019 virtual void accept(ir_visitor
*v
)
2024 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2026 virtual bool equals(const ir_instruction
*ir
,
2027 enum ir_node_type ignore
= ir_type_unset
) const;
2030 * Return a string representing the ir_texture_opcode.
2032 const char *opcode_string();
2034 /** Set the sampler and type. */
2035 void set_sampler(ir_dereference
*sampler
, const glsl_type
*type
);
2038 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
2040 static ir_texture_opcode
get_opcode(const char *);
2042 enum ir_texture_opcode op
;
2044 /** Sampler to use for the texture access. */
2045 ir_dereference
*sampler
;
2047 /** Texture coordinate to sample */
2048 ir_rvalue
*coordinate
;
2051 * Value used for projective divide.
2053 * If there is no projective divide (the common case), this will be
2054 * \c NULL. Optimization passes should check for this to point to a constant
2055 * of 1.0 and replace that with \c NULL.
2057 ir_rvalue
*projector
;
2060 * Coordinate used for comparison on shadow look-ups.
2062 * If there is no shadow comparison, this will be \c NULL. For the
2063 * \c ir_txf opcode, this *must* be \c NULL.
2065 ir_rvalue
*shadow_comparitor
;
2067 /** Texel offset. */
2071 ir_rvalue
*lod
; /**< Floating point LOD */
2072 ir_rvalue
*bias
; /**< Floating point LOD bias */
2073 ir_rvalue
*sample_index
; /**< MSAA sample index */
2074 ir_rvalue
*component
; /**< Gather component selector */
2076 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
2077 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
2083 struct ir_swizzle_mask
{
2090 * Number of components in the swizzle.
2092 unsigned num_components
:3;
2095 * Does the swizzle contain duplicate components?
2097 * L-value swizzles cannot contain duplicate components.
2099 unsigned has_duplicates
:1;
2103 class ir_swizzle
: public ir_rvalue
{
2105 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
2108 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
2110 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
2112 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
2114 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2117 * Construct an ir_swizzle from the textual representation. Can fail.
2119 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
2121 virtual void accept(ir_visitor
*v
)
2126 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2128 virtual bool equals(const ir_instruction
*ir
,
2129 enum ir_node_type ignore
= ir_type_unset
) const;
2131 bool is_lvalue() const
2133 return val
->is_lvalue() && !mask
.has_duplicates
;
2137 * Get the variable that is ultimately referenced by an r-value
2139 virtual ir_variable
*variable_referenced() const;
2142 ir_swizzle_mask mask
;
2146 * Initialize the mask component of a swizzle
2148 * This is used by the \c ir_swizzle constructors.
2150 void init_mask(const unsigned *components
, unsigned count
);
2154 class ir_dereference
: public ir_rvalue
{
2156 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
2158 bool is_lvalue() const;
2161 * Get the variable that is ultimately referenced by an r-value
2163 virtual ir_variable
*variable_referenced() const = 0;
2166 ir_dereference(enum ir_node_type t
)
2173 class ir_dereference_variable
: public ir_dereference
{
2175 ir_dereference_variable(ir_variable
*var
);
2177 virtual ir_dereference_variable
*clone(void *mem_ctx
,
2178 struct hash_table
*) const;
2180 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2182 virtual bool equals(const ir_instruction
*ir
,
2183 enum ir_node_type ignore
= ir_type_unset
) const;
2186 * Get the variable that is ultimately referenced by an r-value
2188 virtual ir_variable
*variable_referenced() const
2193 virtual ir_variable
*whole_variable_referenced()
2195 /* ir_dereference_variable objects always dereference the entire
2196 * variable. However, if this dereference is dereferenced by anything
2197 * else, the complete deferefernce chain is not a whole-variable
2198 * dereference. This method should only be called on the top most
2199 * ir_rvalue in a dereference chain.
2204 virtual void accept(ir_visitor
*v
)
2209 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2212 * Object being dereferenced.
2218 class ir_dereference_array
: public ir_dereference
{
2220 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
2222 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
2224 virtual ir_dereference_array
*clone(void *mem_ctx
,
2225 struct hash_table
*) const;
2227 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2229 virtual bool equals(const ir_instruction
*ir
,
2230 enum ir_node_type ignore
= ir_type_unset
) const;
2233 * Get the variable that is ultimately referenced by an r-value
2235 virtual ir_variable
*variable_referenced() const
2237 return this->array
->variable_referenced();
2240 virtual void accept(ir_visitor
*v
)
2245 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2248 ir_rvalue
*array_index
;
2251 void set_array(ir_rvalue
*value
);
2255 class ir_dereference_record
: public ir_dereference
{
2257 ir_dereference_record(ir_rvalue
*value
, const char *field
);
2259 ir_dereference_record(ir_variable
*var
, const char *field
);
2261 virtual ir_dereference_record
*clone(void *mem_ctx
,
2262 struct hash_table
*) const;
2264 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2267 * Get the variable that is ultimately referenced by an r-value
2269 virtual ir_variable
*variable_referenced() const
2271 return this->record
->variable_referenced();
2274 virtual void accept(ir_visitor
*v
)
2279 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2287 * Data stored in an ir_constant
2289 union ir_constant_data
{
2298 class ir_constant
: public ir_rvalue
{
2300 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
2301 ir_constant(bool b
, unsigned vector_elements
=1);
2302 ir_constant(unsigned int u
, unsigned vector_elements
=1);
2303 ir_constant(int i
, unsigned vector_elements
=1);
2304 ir_constant(float f
, unsigned vector_elements
=1);
2305 ir_constant(double d
, unsigned vector_elements
=1);
2308 * Construct an ir_constant from a list of ir_constant values
2310 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
2313 * Construct an ir_constant from a scalar component of another ir_constant
2315 * The new \c ir_constant inherits the type of the component from the
2319 * In the case of a matrix constant, the new constant is a scalar, \b not
2322 ir_constant(const ir_constant
*c
, unsigned i
);
2325 * Return a new ir_constant of the specified type containing all zeros.
2327 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
2329 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
2331 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2333 virtual void accept(ir_visitor
*v
)
2338 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2340 virtual bool equals(const ir_instruction
*ir
,
2341 enum ir_node_type ignore
= ir_type_unset
) const;
2344 * Get a particular component of a constant as a specific type
2346 * This is useful, for example, to get a value from an integer constant
2347 * as a float or bool. This appears frequently when constructors are
2348 * called with all constant parameters.
2351 bool get_bool_component(unsigned i
) const;
2352 float get_float_component(unsigned i
) const;
2353 double get_double_component(unsigned i
) const;
2354 int get_int_component(unsigned i
) const;
2355 unsigned get_uint_component(unsigned i
) const;
2358 ir_constant
*get_array_element(unsigned i
) const;
2360 ir_constant
*get_record_field(const char *name
);
2363 * Copy the values on another constant at a given offset.
2365 * The offset is ignored for array or struct copies, it's only for
2366 * scalars or vectors into vectors or matrices.
2368 * With identical types on both sides and zero offset it's clone()
2369 * without creating a new object.
2372 void copy_offset(ir_constant
*src
, int offset
);
2375 * Copy the values on another constant at a given offset and
2376 * following an assign-like mask.
2378 * The mask is ignored for scalars.
2380 * Note that this function only handles what assign can handle,
2381 * i.e. at most a vector as source and a column of a matrix as
2385 void copy_masked_offset(ir_constant
*src
, int offset
, unsigned int mask
);
2388 * Determine whether a constant has the same value as another constant
2390 * \sa ir_constant::is_zero, ir_constant::is_one,
2391 * ir_constant::is_negative_one
2393 bool has_value(const ir_constant
*) const;
2396 * Return true if this ir_constant represents the given value.
2398 * For vectors, this checks that each component is the given value.
2400 virtual bool is_value(float f
, int i
) const;
2401 virtual bool is_zero() const;
2402 virtual bool is_one() const;
2403 virtual bool is_negative_one() const;
2406 * Return true for constants that could be stored as 16-bit unsigned values.
2408 * Note that this will return true even for signed integer ir_constants, as
2409 * long as the value is non-negative and fits in 16-bits.
2411 virtual bool is_uint16_constant() const;
2414 * Value of the constant.
2416 * The field used to back the values supplied by the constant is determined
2417 * by the type associated with the \c ir_instruction. Constants may be
2418 * scalars, vectors, or matrices.
2420 union ir_constant_data value
;
2422 /* Array elements */
2423 ir_constant
**array_elements
;
2425 /* Structure fields */
2426 exec_list components
;
2430 * Parameterless constructor only used by the clone method
2436 * IR instruction to emit a vertex in a geometry shader.
2438 class ir_emit_vertex
: public ir_instruction
{
2440 ir_emit_vertex(ir_rvalue
*stream
)
2441 : ir_instruction(ir_type_emit_vertex
),
2447 virtual void accept(ir_visitor
*v
)
2452 virtual ir_emit_vertex
*clone(void *mem_ctx
, struct hash_table
*ht
) const
2454 return new(mem_ctx
) ir_emit_vertex(this->stream
->clone(mem_ctx
, ht
));
2457 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2459 int stream_id() const
2461 return stream
->as_constant()->value
.i
[0];
2468 * IR instruction to complete the current primitive and start a new one in a
2471 class ir_end_primitive
: public ir_instruction
{
2473 ir_end_primitive(ir_rvalue
*stream
)
2474 : ir_instruction(ir_type_end_primitive
),
2480 virtual void accept(ir_visitor
*v
)
2485 virtual ir_end_primitive
*clone(void *mem_ctx
, struct hash_table
*ht
) const
2487 return new(mem_ctx
) ir_end_primitive(this->stream
->clone(mem_ctx
, ht
));
2490 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2492 int stream_id() const
2494 return stream
->as_constant()->value
.i
[0];
2501 * IR instruction for tessellation control and compute shader barrier.
2503 class ir_barrier
: public ir_instruction
{
2506 : ir_instruction(ir_type_barrier
)
2510 virtual void accept(ir_visitor
*v
)
2515 virtual ir_barrier
*clone(void *mem_ctx
, struct hash_table
*) const
2517 return new(mem_ctx
) ir_barrier();
2520 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2526 * Apply a visitor to each IR node in a list
2529 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
2532 * Validate invariants on each IR node in a list
2534 void validate_ir_tree(exec_list
*instructions
);
2536 struct _mesa_glsl_parse_state
;
2537 struct gl_shader_program
;
2540 * Detect whether an unlinked shader contains static recursion
2542 * If the list of instructions is determined to contain static recursion,
2543 * \c _mesa_glsl_error will be called to emit error messages for each function
2544 * that is in the recursion cycle.
2547 detect_recursion_unlinked(struct _mesa_glsl_parse_state
*state
,
2548 exec_list
*instructions
);
2551 * Detect whether a linked shader contains static recursion
2553 * If the list of instructions is determined to contain static recursion,
2554 * \c link_error_printf will be called to emit error messages for each function
2555 * that is in the recursion cycle. In addition,
2556 * \c gl_shader_program::LinkStatus will be set to false.
2559 detect_recursion_linked(struct gl_shader_program
*prog
,
2560 exec_list
*instructions
);
2563 * Make a clone of each IR instruction in a list
2565 * \param in List of IR instructions that are to be cloned
2566 * \param out List to hold the cloned instructions
2569 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
2572 _mesa_glsl_initialize_variables(exec_list
*instructions
,
2573 struct _mesa_glsl_parse_state
*state
);
2576 _mesa_glsl_initialize_derived_variables(struct gl_context
*ctx
,
2580 _mesa_glsl_initialize_functions(_mesa_glsl_parse_state
*state
);
2583 _mesa_glsl_initialize_builtin_functions();
2585 extern ir_function_signature
*
2586 _mesa_glsl_find_builtin_function(_mesa_glsl_parse_state
*state
,
2587 const char *name
, exec_list
*actual_parameters
);
2589 extern ir_function
*
2590 _mesa_glsl_find_builtin_function_by_name(const char *name
);
2593 _mesa_glsl_get_builtin_function_shader(void);
2595 extern ir_function_signature
*
2596 _mesa_get_main_function_signature(gl_shader
*sh
);
2599 _mesa_glsl_release_functions(void);
2602 _mesa_glsl_release_builtin_functions(void);
2605 reparent_ir(exec_list
*list
, void *mem_ctx
);
2607 struct glsl_symbol_table
;
2610 import_prototypes(const exec_list
*source
, exec_list
*dest
,
2611 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
2614 ir_has_call(ir_instruction
*ir
);
2617 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
,
2618 gl_shader_stage shader_stage
);
2621 prototype_string(const glsl_type
*return_type
, const char *name
,
2622 exec_list
*parameters
);
2625 mode_string(const ir_variable
*var
);
2628 * Built-in / reserved GL variables names start with "gl_"
2631 is_gl_identifier(const char *s
)
2633 return s
&& s
[0] == 'g' && s
[1] == 'l' && s
[2] == '_';
2637 #endif /* __cplusplus */
2639 extern void _mesa_print_ir(FILE *f
, struct exec_list
*instructions
,
2640 struct _mesa_glsl_parse_state
*state
);
2643 fprint_ir(FILE *f
, const void *instruction
);
2645 extern const struct gl_builtin_uniform_desc
*
2646 _mesa_glsl_get_builtin_uniform_desc(const char *name
);
2653 vertices_per_prim(GLenum prim
);