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30 #include "glsl_parser_extras.h"
32 struct _mesa_glsl_parse_state
;
37 * \defgroup AST Abstract syntax tree node definitions
39 * An abstract syntax tree is generated by the parser. This is a fairly
40 * direct representation of the gramma derivation for the source program.
41 * No symantic checking is done during the generation of the AST. Only
42 * syntactic checking is done. Symantic checking is performed by a later
43 * stage that converts the AST to a more generic intermediate representation.
48 * Base class of all abstract syntax tree nodes
52 /* Callers of this ralloc-based new need not call delete. It's
53 * easier to just ralloc_free 'ctx' (or any of its ancestors). */
54 static void* operator new(size_t size
, void *ctx
)
58 node
= rzalloc_size(ctx
, size
);
64 /* If the user *does* call delete, that's OK, we will just
65 * ralloc_free in that case. */
66 static void operator delete(void *table
)
72 * Print an AST node in something approximating the original GLSL code
74 virtual void print(void) const;
77 * Convert the AST node to the high-level intermediate representation
79 virtual ir_rvalue
*hir(exec_list
*instructions
,
80 struct _mesa_glsl_parse_state
*state
);
83 * Retrieve the source location of an AST node
85 * This function is primarily used to get the source position of an AST node
86 * into a form that can be passed to \c _mesa_glsl_error.
88 * \sa _mesa_glsl_error, ast_node::set_location
90 struct YYLTYPE
get_location(void) const
94 locp
.source
= this->location
.source
;
95 locp
.first_line
= this->location
.line
;
96 locp
.first_column
= this->location
.column
;
97 locp
.last_line
= locp
.first_line
;
98 locp
.last_column
= locp
.first_column
;
104 * Set the source location of an AST node from a parser location
106 * \sa ast_node::get_location
108 void set_location(const struct YYLTYPE
&locp
)
110 this->location
.source
= locp
.source
;
111 this->location
.line
= locp
.first_line
;
112 this->location
.column
= locp
.first_column
;
116 * Source location of the AST node.
119 unsigned source
; /**< GLSL source number. */
120 unsigned line
; /**< Line number within the source string. */
121 unsigned column
; /**< Column in the line. */
128 * The only constructor is protected so that only derived class objects can
136 * Operators for AST expression nodes.
140 ast_plus
, /**< Unary + operator. */
196 * Representation of any sort of expression.
198 class ast_expression
: public ast_node
{
200 ast_expression(int oper
, ast_expression
*,
201 ast_expression
*, ast_expression
*);
203 ast_expression(const char *identifier
) :
206 subexpressions
[0] = NULL
;
207 subexpressions
[1] = NULL
;
208 subexpressions
[2] = NULL
;
209 primary_expression
.identifier
= (char *) identifier
;
210 this->non_lvalue_description
= NULL
;
213 static const char *operator_string(enum ast_operators op
);
215 virtual ir_rvalue
*hir(exec_list
*instructions
,
216 struct _mesa_glsl_parse_state
*state
);
218 virtual void print(void) const;
220 enum ast_operators oper
;
222 ast_expression
*subexpressions
[3];
227 float float_constant
;
228 unsigned uint_constant
;
230 } primary_expression
;
234 * List of expressions for an \c ast_sequence or parameters for an
235 * \c ast_function_call
237 exec_list expressions
;
240 * For things that can't be l-values, this describes what it is.
242 * This text is used by the code that generates IR for assignments to
243 * detect and emit useful messages for assignments to some things that
244 * can't be l-values. For example, pre- or post-incerement expressions.
247 * This pointer may be \c NULL.
249 const char *non_lvalue_description
;
252 class ast_expression_bin
: public ast_expression
{
254 ast_expression_bin(int oper
, ast_expression
*, ast_expression
*);
256 virtual void print(void) const;
260 * Subclass of expressions for function calls
262 class ast_function_expression
: public ast_expression
{
264 ast_function_expression(ast_expression
*callee
)
265 : ast_expression(ast_function_call
, callee
,
272 ast_function_expression(class ast_type_specifier
*type
)
273 : ast_expression(ast_function_call
, (ast_expression
*) type
,
280 bool is_constructor() const
285 virtual ir_rvalue
*hir(exec_list
*instructions
,
286 struct _mesa_glsl_parse_state
*state
);
290 * Is this function call actually a constructor?
297 * Number of possible operators for an ast_expression
299 * This is done as a define instead of as an additional value in the enum so
300 * that the compiler won't generate spurious messages like "warning:
301 * enumeration value ‘ast_num_operators’ not handled in switch"
303 #define AST_NUM_OPERATORS (ast_sequence + 1)
306 class ast_compound_statement
: public ast_node
{
308 ast_compound_statement(int new_scope
, ast_node
*statements
);
309 virtual void print(void) const;
311 virtual ir_rvalue
*hir(exec_list
*instructions
,
312 struct _mesa_glsl_parse_state
*state
);
315 exec_list statements
;
318 class ast_declaration
: public ast_node
{
320 ast_declaration(char *identifier
, int is_array
, ast_expression
*array_size
,
321 ast_expression
*initializer
);
322 virtual void print(void) const;
327 ast_expression
*array_size
;
329 ast_expression
*initializer
;
334 ast_precision_none
= 0, /**< Absence of precision qualifier. */
336 ast_precision_medium
,
340 struct ast_type_qualifier
{
343 unsigned invariant
:1;
345 unsigned attribute
:1;
353 unsigned noperspective
:1;
355 /** \name Layout qualifiers for GL_ARB_fragment_coord_conventions */
357 unsigned origin_upper_left
:1;
358 unsigned pixel_center_integer
:1;
362 * Flag set if GL_ARB_explicit_attrib_location "location" layout
365 unsigned explicit_location
:1;
367 /** \name Layout qualifiers for GL_AMD_conservative_depth */
369 unsigned depth_any
:1;
370 unsigned depth_greater
:1;
371 unsigned depth_less
:1;
372 unsigned depth_unchanged
:1;
375 /** \brief Set of flags, accessed by name. */
378 /** \brief Set of flags, accessed as a bitmask. */
383 * Location specified via GL_ARB_explicit_attrib_location layout
386 * This field is only valid if \c explicit_location is set.
391 * Return true if and only if an interpolation qualifier is present.
393 bool has_interpolation() const;
396 * \brief Return string representation of interpolation qualifier.
398 * If an interpolation qualifier is present, then return that qualifier's
399 * string representation. Otherwise, return null. For example, if the
400 * noperspective bit is set, then this returns "noperspective".
402 * If multiple interpolation qualifiers are somehow present, then the
403 * returned string is undefined but not null.
405 const char *interpolation_string() const;
408 class ast_struct_specifier
: public ast_node
{
410 ast_struct_specifier(char *identifier
, ast_node
*declarator_list
);
411 virtual void print(void) const;
413 virtual ir_rvalue
*hir(exec_list
*instructions
,
414 struct _mesa_glsl_parse_state
*state
);
417 exec_list declarations
;
453 ast_samplerexternaloes
,
456 ast_sampler2drectshadow
,
457 ast_samplercubeshadow
,
460 ast_sampler1darrayshadow
,
461 ast_sampler2darrayshadow
,
480 class ast_type_specifier
: public ast_node
{
482 ast_type_specifier(int specifier
);
484 /** Construct a type specifier from a type name */
485 ast_type_specifier(const char *name
)
486 : type_specifier(ast_type_name
), type_name(name
), structure(NULL
),
487 is_array(false), array_size(NULL
), precision(ast_precision_none
),
488 is_precision_statement(false)
493 /** Construct a type specifier from a structure definition */
494 ast_type_specifier(ast_struct_specifier
*s
)
495 : type_specifier(ast_struct
), type_name(s
->name
), structure(s
),
496 is_array(false), array_size(NULL
), precision(ast_precision_none
),
497 is_precision_statement(false)
502 const struct glsl_type
*glsl_type(const char **name
,
503 struct _mesa_glsl_parse_state
*state
)
506 virtual void print(void) const;
508 ir_rvalue
*hir(exec_list
*, struct _mesa_glsl_parse_state
*);
510 enum ast_types type_specifier
;
512 const char *type_name
;
513 ast_struct_specifier
*structure
;
516 ast_expression
*array_size
;
518 unsigned precision
:2;
520 bool is_precision_statement
;
524 class ast_fully_specified_type
: public ast_node
{
526 virtual void print(void) const;
527 bool has_qualifiers() const;
529 ast_type_qualifier qualifier
;
530 ast_type_specifier
*specifier
;
534 class ast_declarator_list
: public ast_node
{
536 ast_declarator_list(ast_fully_specified_type
*);
537 virtual void print(void) const;
539 virtual ir_rvalue
*hir(exec_list
*instructions
,
540 struct _mesa_glsl_parse_state
*state
);
542 ast_fully_specified_type
*type
;
543 exec_list declarations
;
546 * Special flag for vertex shader "invariant" declarations.
548 * Vertex shaders can contain "invariant" variable redeclarations that do
549 * not include a type. For example, "invariant gl_Position;". This flag
550 * is used to note these cases when no type is specified.
556 class ast_parameter_declarator
: public ast_node
{
558 ast_parameter_declarator()
560 this->identifier
= NULL
;
561 this->is_array
= false;
562 this->array_size
= 0;
565 virtual void print(void) const;
567 virtual ir_rvalue
*hir(exec_list
*instructions
,
568 struct _mesa_glsl_parse_state
*state
);
570 ast_fully_specified_type
*type
;
573 ast_expression
*array_size
;
575 static void parameters_to_hir(exec_list
*ast_parameters
,
576 bool formal
, exec_list
*ir_parameters
,
577 struct _mesa_glsl_parse_state
*state
);
580 /** Is this parameter declaration part of a formal parameter list? */
581 bool formal_parameter
;
584 * Is this parameter 'void' type?
586 * This field is set by \c ::hir.
592 class ast_function
: public ast_node
{
596 virtual void print(void) const;
598 virtual ir_rvalue
*hir(exec_list
*instructions
,
599 struct _mesa_glsl_parse_state
*state
);
601 ast_fully_specified_type
*return_type
;
604 exec_list parameters
;
608 * Is this prototype part of the function definition?
610 * Used by ast_function_definition::hir to process the parameters, etc.
618 * Function signature corresponding to this function prototype instance
620 * Used by ast_function_definition::hir to process the parameters, etc.
625 class ir_function_signature
*signature
;
627 friend class ast_function_definition
;
631 class ast_expression_statement
: public ast_node
{
633 ast_expression_statement(ast_expression
*);
634 virtual void print(void) const;
636 virtual ir_rvalue
*hir(exec_list
*instructions
,
637 struct _mesa_glsl_parse_state
*state
);
639 ast_expression
*expression
;
643 class ast_case_label
: public ast_node
{
645 ast_case_label(ast_expression
*test_value
);
646 virtual void print(void) const;
648 virtual ir_rvalue
*hir(exec_list
*instructions
,
649 struct _mesa_glsl_parse_state
*state
);
652 * An test value of NULL means 'default'.
654 ast_expression
*test_value
;
658 class ast_case_label_list
: public ast_node
{
660 ast_case_label_list(void);
661 virtual void print(void) const;
663 virtual ir_rvalue
*hir(exec_list
*instructions
,
664 struct _mesa_glsl_parse_state
*state
);
667 * A list of case labels.
673 class ast_case_statement
: public ast_node
{
675 ast_case_statement(ast_case_label_list
*labels
);
676 virtual void print(void) const;
678 virtual ir_rvalue
*hir(exec_list
*instructions
,
679 struct _mesa_glsl_parse_state
*state
);
681 ast_case_label_list
*labels
;
684 * A list of statements.
690 class ast_case_statement_list
: public ast_node
{
692 ast_case_statement_list(void);
693 virtual void print(void) const;
695 virtual ir_rvalue
*hir(exec_list
*instructions
,
696 struct _mesa_glsl_parse_state
*state
);
705 class ast_switch_body
: public ast_node
{
707 ast_switch_body(ast_case_statement_list
*stmts
);
708 virtual void print(void) const;
710 virtual ir_rvalue
*hir(exec_list
*instructions
,
711 struct _mesa_glsl_parse_state
*state
);
713 ast_case_statement_list
*stmts
;
717 class ast_selection_statement
: public ast_node
{
719 ast_selection_statement(ast_expression
*condition
,
720 ast_node
*then_statement
,
721 ast_node
*else_statement
);
722 virtual void print(void) const;
724 virtual ir_rvalue
*hir(exec_list
*instructions
,
725 struct _mesa_glsl_parse_state
*state
);
727 ast_expression
*condition
;
728 ast_node
*then_statement
;
729 ast_node
*else_statement
;
733 class ast_switch_statement
: public ast_node
{
735 ast_switch_statement(ast_expression
*test_expression
,
737 virtual void print(void) const;
739 virtual ir_rvalue
*hir(exec_list
*instructions
,
740 struct _mesa_glsl_parse_state
*state
);
742 ast_expression
*test_expression
;
746 void test_to_hir(exec_list
*, struct _mesa_glsl_parse_state
*);
749 class ast_iteration_statement
: public ast_node
{
751 ast_iteration_statement(int mode
, ast_node
*init
, ast_node
*condition
,
752 ast_expression
*rest_expression
, ast_node
*body
);
754 virtual void print(void) const;
756 virtual ir_rvalue
*hir(exec_list
*, struct _mesa_glsl_parse_state
*);
758 enum ast_iteration_modes
{
765 ast_node
*init_statement
;
767 ast_expression
*rest_expression
;
773 * Generate IR from the condition of a loop
775 * This is factored out of ::hir because some loops have the condition
776 * test at the top (for and while), and others have it at the end (do-while).
778 void condition_to_hir(class ir_loop
*, struct _mesa_glsl_parse_state
*);
782 class ast_jump_statement
: public ast_node
{
784 ast_jump_statement(int mode
, ast_expression
*return_value
);
785 virtual void print(void) const;
787 virtual ir_rvalue
*hir(exec_list
*instructions
,
788 struct _mesa_glsl_parse_state
*state
);
790 enum ast_jump_modes
{
797 ast_expression
*opt_return_value
;
801 class ast_function_definition
: public ast_node
{
803 virtual void print(void) const;
805 virtual ir_rvalue
*hir(exec_list
*instructions
,
806 struct _mesa_glsl_parse_state
*state
);
808 ast_function
*prototype
;
809 ast_compound_statement
*body
;
814 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
);
817 _mesa_ast_field_selection_to_hir(const ast_expression
*expr
,
818 exec_list
*instructions
,
819 struct _mesa_glsl_parse_state
*state
);
822 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
);