/* -*- c++ -*- */
/*
* Copyright © 2009 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#pragma once
#ifndef AST_H
#define AST_H
#include "list.h"
#include "glsl_parser_extras.h"
struct _mesa_glsl_parse_state;
struct YYLTYPE;
/**
* \defgroup AST Abstract syntax tree node definitions
*
* An abstract syntax tree is generated by the parser. This is a fairly
* direct representation of the gramma derivation for the source program.
* No symantic checking is done during the generation of the AST. Only
* syntactic checking is done. Symantic checking is performed by a later
* stage that converts the AST to a more generic intermediate representation.
*
*@{
*/
/**
* Base class of all abstract syntax tree nodes
*/
class ast_node {
public:
/* Callers of this ralloc-based new need not call delete. It's
* easier to just ralloc_free 'ctx' (or any of its ancestors). */
static void* operator new(size_t size, void *ctx)
{
void *node;
node = rzalloc_size(ctx, size);
assert(node != NULL);
return node;
}
/* If the user *does* call delete, that's OK, we will just
* ralloc_free in that case. */
static void operator delete(void *table)
{
ralloc_free(table);
}
/**
* Print an AST node in something approximating the original GLSL code
*/
virtual void print(void) const;
/**
* Convert the AST node to the high-level intermediate representation
*/
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
/**
* Retrieve the source location of an AST node
*
* This function is primarily used to get the source position of an AST node
* into a form that can be passed to \c _mesa_glsl_error.
*
* \sa _mesa_glsl_error, ast_node::set_location
*/
struct YYLTYPE get_location(void) const
{
struct YYLTYPE locp;
locp.source = this->location.source;
locp.first_line = this->location.line;
locp.first_column = this->location.column;
locp.last_line = locp.first_line;
locp.last_column = locp.first_column;
return locp;
}
/**
* Set the source location of an AST node from a parser location
*
* \sa ast_node::get_location
*/
void set_location(const struct YYLTYPE &locp)
{
this->location.source = locp.source;
this->location.line = locp.first_line;
this->location.column = locp.first_column;
}
/**
* Source location of the AST node.
*/
struct {
unsigned source; /**< GLSL source number. */
unsigned line; /**< Line number within the source string. */
unsigned column; /**< Column in the line. */
} location;
exec_node link;
protected:
/**
* The only constructor is protected so that only derived class objects can
* be created.
*/
ast_node(void);
};
/**
* Operators for AST expression nodes.
*/
enum ast_operators {
ast_assign,
ast_plus, /**< Unary + operator. */
ast_neg,
ast_add,
ast_sub,
ast_mul,
ast_div,
ast_mod,
ast_lshift,
ast_rshift,
ast_less,
ast_greater,
ast_lequal,
ast_gequal,
ast_equal,
ast_nequal,
ast_bit_and,
ast_bit_xor,
ast_bit_or,
ast_bit_not,
ast_logic_and,
ast_logic_xor,
ast_logic_or,
ast_logic_not,
ast_mul_assign,
ast_div_assign,
ast_mod_assign,
ast_add_assign,
ast_sub_assign,
ast_ls_assign,
ast_rs_assign,
ast_and_assign,
ast_xor_assign,
ast_or_assign,
ast_conditional,
ast_pre_inc,
ast_pre_dec,
ast_post_inc,
ast_post_dec,
ast_field_selection,
ast_array_index,
ast_function_call,
ast_identifier,
ast_int_constant,
ast_uint_constant,
ast_float_constant,
ast_bool_constant,
ast_sequence
};
/**
* Representation of any sort of expression.
*/
class ast_expression : public ast_node {
public:
ast_expression(int oper, ast_expression *,
ast_expression *, ast_expression *);
ast_expression(const char *identifier) :
oper(ast_identifier)
{
subexpressions[0] = NULL;
subexpressions[1] = NULL;
subexpressions[2] = NULL;
primary_expression.identifier = (char *) identifier;
}
static const char *operator_string(enum ast_operators op);
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
virtual void print(void) const;
enum ast_operators oper;
ast_expression *subexpressions[3];
union {
char *identifier;
int int_constant;
float float_constant;
unsigned uint_constant;
int bool_constant;
} primary_expression;
/**
* List of expressions for an \c ast_sequence or parameters for an
* \c ast_function_call
*/
exec_list expressions;
};
class ast_expression_bin : public ast_expression {
public:
ast_expression_bin(int oper, ast_expression *, ast_expression *);
virtual void print(void) const;
};
/**
* Subclass of expressions for function calls
*/
class ast_function_expression : public ast_expression {
public:
ast_function_expression(ast_expression *callee)
: ast_expression(ast_function_call, callee,
NULL, NULL),
cons(false)
{
/* empty */
}
ast_function_expression(class ast_type_specifier *type)
: ast_expression(ast_function_call, (ast_expression *) type,
NULL, NULL),
cons(true)
{
/* empty */
}
bool is_constructor() const
{
return cons;
}
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
private:
/**
* Is this function call actually a constructor?
*/
bool cons;
};
/**
* Number of possible operators for an ast_expression
*
* This is done as a define instead of as an additional value in the enum so
* that the compiler won't generate spurious messages like "warning:
* enumeration value ‘ast_num_operators’ not handled in switch"
*/
#define AST_NUM_OPERATORS (ast_sequence + 1)
class ast_compound_statement : public ast_node {
public:
ast_compound_statement(int new_scope, ast_node *statements);
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
int new_scope;
exec_list statements;
};
class ast_declaration : public ast_node {
public:
ast_declaration(char *identifier, int is_array, ast_expression *array_size,
ast_expression *initializer);
virtual void print(void) const;
char *identifier;
int is_array;
ast_expression *array_size;
ast_expression *initializer;
};
enum {
ast_precision_none = 0, /**< Absence of precision qualifier. */
ast_precision_high,
ast_precision_medium,
ast_precision_low
};
struct ast_type_qualifier {
union {
struct {
unsigned invariant:1;
unsigned constant:1;
unsigned attribute:1;
unsigned varying:1;
unsigned in:1;
unsigned out:1;
unsigned centroid:1;
unsigned uniform:1;
unsigned smooth:1;
unsigned flat:1;
unsigned noperspective:1;
/** \name Layout qualifiers for GL_ARB_fragment_coord_conventions */
/*@{*/
unsigned origin_upper_left:1;
unsigned pixel_center_integer:1;
/*@}*/
/**
* Flag set if GL_ARB_explicit_attrib_location "location" layout
* qualifier is used.
*/
unsigned explicit_location:1;
} q;
unsigned i;
} flags;
/**
* Location specified via GL_ARB_explicit_attrib_location layout
*
* \note
* This field is only valid if \c explicit_location is set.
*/
unsigned location;
};
class ast_struct_specifier : public ast_node {
public:
ast_struct_specifier(char *identifier, ast_node *declarator_list);
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
char *name;
exec_list declarations;
};
enum ast_types {
ast_void,
ast_float,
ast_int,
ast_uint,
ast_bool,
ast_vec2,
ast_vec3,
ast_vec4,
ast_bvec2,
ast_bvec3,
ast_bvec4,
ast_ivec2,
ast_ivec3,
ast_ivec4,
ast_uvec2,
ast_uvec3,
ast_uvec4,
ast_mat2,
ast_mat2x3,
ast_mat2x4,
ast_mat3x2,
ast_mat3,
ast_mat3x4,
ast_mat4x2,
ast_mat4x3,
ast_mat4,
ast_sampler1d,
ast_sampler2d,
ast_sampler2drect,
ast_sampler3d,
ast_samplercube,
ast_sampler1dshadow,
ast_sampler2dshadow,
ast_sampler2drectshadow,
ast_samplercubeshadow,
ast_sampler1darray,
ast_sampler2darray,
ast_sampler1darrayshadow,
ast_sampler2darrayshadow,
ast_isampler1d,
ast_isampler2d,
ast_isampler3d,
ast_isamplercube,
ast_isampler1darray,
ast_isampler2darray,
ast_usampler1d,
ast_usampler2d,
ast_usampler3d,
ast_usamplercube,
ast_usampler1darray,
ast_usampler2darray,
ast_struct,
ast_type_name
};
class ast_type_specifier : public ast_node {
public:
ast_type_specifier(int specifier);
/** Construct a type specifier from a type name */
ast_type_specifier(const char *name)
: type_specifier(ast_type_name), type_name(name), structure(NULL),
is_array(false), array_size(NULL), precision(ast_precision_none),
is_precision_statement(false)
{
/* empty */
}
/** Construct a type specifier from a structure definition */
ast_type_specifier(ast_struct_specifier *s)
: type_specifier(ast_struct), type_name(s->name), structure(s),
is_array(false), array_size(NULL), precision(ast_precision_none),
is_precision_statement(false)
{
/* empty */
}
const struct glsl_type *glsl_type(const char **name,
struct _mesa_glsl_parse_state *state)
const;
virtual void print(void) const;
ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
enum ast_types type_specifier;
const char *type_name;
ast_struct_specifier *structure;
int is_array;
ast_expression *array_size;
unsigned precision:2;
bool is_precision_statement;
};
class ast_fully_specified_type : public ast_node {
public:
virtual void print(void) const;
bool has_qualifiers() const;
ast_type_qualifier qualifier;
ast_type_specifier *specifier;
};
class ast_declarator_list : public ast_node {
public:
ast_declarator_list(ast_fully_specified_type *);
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
ast_fully_specified_type *type;
exec_list declarations;
/**
* Special flag for vertex shader "invariant" declarations.
*
* Vertex shaders can contain "invariant" variable redeclarations that do
* not include a type. For example, "invariant gl_Position;". This flag
* is used to note these cases when no type is specified.
*/
int invariant;
};
class ast_parameter_declarator : public ast_node {
public:
ast_parameter_declarator()
{
this->identifier = NULL;
this->is_array = false;
this->array_size = 0;
}
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
ast_fully_specified_type *type;
char *identifier;
int is_array;
ast_expression *array_size;
static void parameters_to_hir(exec_list *ast_parameters,
bool formal, exec_list *ir_parameters,
struct _mesa_glsl_parse_state *state);
private:
/** Is this parameter declaration part of a formal parameter list? */
bool formal_parameter;
/**
* Is this parameter 'void' type?
*
* This field is set by \c ::hir.
*/
bool is_void;
};
class ast_function : public ast_node {
public:
ast_function(void);
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
ast_fully_specified_type *return_type;
char *identifier;
exec_list parameters;
private:
/**
* Is this prototype part of the function definition?
*
* Used by ast_function_definition::hir to process the parameters, etc.
* of the function.
*
* \sa ::hir
*/
bool is_definition;
/**
* Function signature corresponding to this function prototype instance
*
* Used by ast_function_definition::hir to process the parameters, etc.
* of the function.
*
* \sa ::hir
*/
class ir_function_signature *signature;
friend class ast_function_definition;
};
class ast_declaration_statement : public ast_node {
public:
ast_declaration_statement(void);
enum {
ast_function,
ast_declaration,
ast_precision
} mode;
union {
class ast_function *function;
ast_declarator_list *declarator;
ast_type_specifier *type;
ast_node *node;
} declaration;
};
class ast_expression_statement : public ast_node {
public:
ast_expression_statement(ast_expression *);
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
ast_expression *expression;
};
class ast_case_label : public ast_node {
public:
/**
* An expression of NULL means 'default'.
*/
ast_expression *expression;
};
class ast_selection_statement : public ast_node {
public:
ast_selection_statement(ast_expression *condition,
ast_node *then_statement,
ast_node *else_statement);
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
ast_expression *condition;
ast_node *then_statement;
ast_node *else_statement;
};
class ast_switch_statement : public ast_node {
public:
ast_expression *expression;
exec_list statements;
};
class ast_iteration_statement : public ast_node {
public:
ast_iteration_statement(int mode, ast_node *init, ast_node *condition,
ast_expression *rest_expression, ast_node *body);
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
enum ast_iteration_modes {
ast_for,
ast_while,
ast_do_while
} mode;
ast_node *init_statement;
ast_node *condition;
ast_expression *rest_expression;
ast_node *body;
private:
/**
* Generate IR from the condition of a loop
*
* This is factored out of ::hir because some loops have the condition
* test at the top (for and while), and others have it at the end (do-while).
*/
void condition_to_hir(class ir_loop *, struct _mesa_glsl_parse_state *);
};
class ast_jump_statement : public ast_node {
public:
ast_jump_statement(int mode, ast_expression *return_value);
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
enum ast_jump_modes {
ast_continue,
ast_break,
ast_return,
ast_discard
} mode;
ast_expression *opt_return_value;
};
class ast_function_definition : public ast_node {
public:
virtual void print(void) const;
virtual ir_rvalue *hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state);
ast_function *prototype;
ast_compound_statement *body;
};
/*@}*/
extern void
_mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state);
extern ir_rvalue *
_mesa_ast_field_selection_to_hir(const ast_expression *expr,
exec_list *instructions,
struct _mesa_glsl_parse_state *state);
void
emit_function(_mesa_glsl_parse_state *state, exec_list *instructions,
ir_function *f);
#endif /* AST_H */