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ast_to_hir.cpp
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ast_to_hir.cpp
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/*
* Copyright © 2010 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.
*/
/**
* \file ast_to_hir.c
* Convert abstract syntax to to high-level intermediate reprensentation (HIR).
*
* During the conversion to HIR, the majority of the symantic checking is
* preformed on the program. This includes:
*
* * Symbol table management
* * Type checking
* * Function binding
*
* The majority of this work could be done during parsing, and the parser could
* probably generate HIR directly. However, this results in frequent changes
* to the parser code. Since we do not assume that every system this complier
* is built on will have Flex and Bison installed, we have to store the code
* generated by these tools in our version control system. In other parts of
* the system we've seen problems where a parser was changed but the generated
* code was not committed, merge conflicts where created because two developers
* had slightly different versions of Bison installed, etc.
*
* I have also noticed that running Bison generated parsers in GDB is very
* irritating. When you get a segfault on '$$ = $1->foo', you can't very
* well 'print $1' in GDB.
*
* As a result, my preference is to put as little C code as possible in the
* parser (and lexer) sources.
*/
#include "main/core.h" /* for struct gl_extensions */
#include "glsl_symbol_table.h"
#include "glsl_parser_extras.h"
#include "ast.h"
#include "glsl_types.h"
#include "program/hash_table.h"
#include "ir.h"
static void
detect_conflicting_assignments(struct _mesa_glsl_parse_state *state,
exec_list *instructions);
void
_mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
{
_mesa_glsl_initialize_variables(instructions, state);
state->symbols->language_version = state->language_version;
state->current_function = NULL;
state->toplevel_ir = instructions;
/* Section 4.2 of the GLSL 1.20 specification states:
* "The built-in functions are scoped in a scope outside the global scope
* users declare global variables in. That is, a shader's global scope,
* available for user-defined functions and global variables, is nested
* inside the scope containing the built-in functions."
*
* Since built-in functions like ftransform() access built-in variables,
* it follows that those must be in the outer scope as well.
*
* We push scope here to create this nesting effect...but don't pop.
* This way, a shader's globals are still in the symbol table for use
* by the linker.
*/
state->symbols->push_scope();
foreach_list_typed (ast_node, ast, link, & state->translation_unit)
ast->hir(instructions, state);
detect_recursion_unlinked(state, instructions);
detect_conflicting_assignments(state, instructions);
state->toplevel_ir = NULL;
}
/**
* If a conversion is available, convert one operand to a different type
*
* The \c from \c ir_rvalue is converted "in place".
*
* \param to Type that the operand it to be converted to
* \param from Operand that is being converted
* \param state GLSL compiler state
*
* \return
* If a conversion is possible (or unnecessary), \c true is returned.
* Otherwise \c false is returned.
*/
bool
apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
struct _mesa_glsl_parse_state *state)
{
void *ctx = state;
if (to->base_type == from->type->base_type)
return true;
/* This conversion was added in GLSL 1.20. If the compilation mode is
* GLSL 1.10, the conversion is skipped.
*/
if (state->language_version < 120)
return false;
/* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
*
* "There are no implicit array or structure conversions. For
* example, an array of int cannot be implicitly converted to an
* array of float. There are no implicit conversions between
* signed and unsigned integers."
*/
/* FINISHME: The above comment is partially a lie. There is int/uint
* FINISHME: conversion for immediate constants.
*/
if (!to->is_float() || !from->type->is_numeric())
return false;
/* Convert to a floating point type with the same number of components
* as the original type - i.e. int to float, not int to vec4.
*/
to = glsl_type::get_instance(GLSL_TYPE_FLOAT, from->type->vector_elements,
from->type->matrix_columns);
switch (from->type->base_type) {
case GLSL_TYPE_INT:
from = new(ctx) ir_expression(ir_unop_i2f, to, from, NULL);
break;
case GLSL_TYPE_UINT:
from = new(ctx) ir_expression(ir_unop_u2f, to, from, NULL);
break;
case GLSL_TYPE_BOOL:
from = new(ctx) ir_expression(ir_unop_b2f, to, from, NULL);
break;
default:
assert(0);
}
return true;
}
static const struct glsl_type *
arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
bool multiply,
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
{
const glsl_type *type_a = value_a->type;
const glsl_type *type_b = value_b->type;
/* From GLSL 1.50 spec, page 56:
*
* "The arithmetic binary operators add (+), subtract (-),
* multiply (*), and divide (/) operate on integer and
* floating-point scalars, vectors, and matrices."
*/
if (!type_a->is_numeric() || !type_b->is_numeric()) {
_mesa_glsl_error(loc, state,
"Operands to arithmetic operators must be numeric");
return glsl_type::error_type;
}
/* "If one operand is floating-point based and the other is
* not, then the conversions from Section 4.1.10 "Implicit
* Conversions" are applied to the non-floating-point-based operand."
*/
if (!apply_implicit_conversion(type_a, value_b, state)
&& !apply_implicit_conversion(type_b, value_a, state)) {
_mesa_glsl_error(loc, state,
"Could not implicitly convert operands to "
"arithmetic operator");
return glsl_type::error_type;
}
type_a = value_a->type;
type_b = value_b->type;
/* "If the operands are integer types, they must both be signed or
* both be unsigned."
*
* From this rule and the preceeding conversion it can be inferred that
* both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
* The is_numeric check above already filtered out the case where either
* type is not one of these, so now the base types need only be tested for
* equality.
*/
if (type_a->base_type != type_b->base_type) {
_mesa_glsl_error(loc, state,
"base type mismatch for arithmetic operator");
return glsl_type::error_type;
}
/* "All arithmetic binary operators result in the same fundamental type
* (signed integer, unsigned integer, or floating-point) as the
* operands they operate on, after operand type conversion. After
* conversion, the following cases are valid
*
* * The two operands are scalars. In this case the operation is
* applied, resulting in a scalar."
*/
if (type_a->is_scalar() && type_b->is_scalar())
return type_a;
/* "* One operand is a scalar, and the other is a vector or matrix.
* In this case, the scalar operation is applied independently to each
* component of the vector or matrix, resulting in the same size
* vector or matrix."
*/
if (type_a->is_scalar()) {
if (!type_b->is_scalar())
return type_b;
} else if (type_b->is_scalar()) {
return type_a;
}
/* All of the combinations of <scalar, scalar>, <vector, scalar>,
* <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
* handled.
*/
assert(!type_a->is_scalar());
assert(!type_b->is_scalar());
/* "* The two operands are vectors of the same size. In this case, the
* operation is done component-wise resulting in the same size
* vector."
*/
if (type_a->is_vector() && type_b->is_vector()) {
if (type_a == type_b) {
return type_a;
} else {
_mesa_glsl_error(loc, state,
"vector size mismatch for arithmetic operator");
return glsl_type::error_type;
}
}
/* All of the combinations of <scalar, scalar>, <vector, scalar>,
* <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
* <vector, vector> have been handled. At least one of the operands must
* be matrix. Further, since there are no integer matrix types, the base
* type of both operands must be float.
*/
assert(type_a->is_matrix() || type_b->is_matrix());
assert(type_a->base_type == GLSL_TYPE_FLOAT);
assert(type_b->base_type == GLSL_TYPE_FLOAT);
/* "* The operator is add (+), subtract (-), or divide (/), and the
* operands are matrices with the same number of rows and the same
* number of columns. In this case, the operation is done component-
* wise resulting in the same size matrix."
* * The operator is multiply (*), where both operands are matrices or
* one operand is a vector and the other a matrix. A right vector
* operand is treated as a column vector and a left vector operand as a
* row vector. In all these cases, it is required that the number of
* columns of the left operand is equal to the number of rows of the
* right operand. Then, the multiply (*) operation does a linear
* algebraic multiply, yielding an object that has the same number of
* rows as the left operand and the same number of columns as the right
* operand. Section 5.10 "Vector and Matrix Operations" explains in
* more detail how vectors and matrices are operated on."
*/
if (! multiply) {
if (type_a == type_b)
return type_a;
} else {
if (type_a->is_matrix() && type_b->is_matrix()) {
/* Matrix multiply. The columns of A must match the rows of B. Given
* the other previously tested constraints, this means the vector type
* of a row from A must be the same as the vector type of a column from
* B.
*/
if (type_a->row_type() == type_b->column_type()) {
/* The resulting matrix has the number of columns of matrix B and
* the number of rows of matrix A. We get the row count of A by
* looking at the size of a vector that makes up a column. The
* transpose (size of a row) is done for B.
*/
const glsl_type *const type =
glsl_type::get_instance(type_a->base_type,
type_a->column_type()->vector_elements,
type_b->row_type()->vector_elements);
assert(type != glsl_type::error_type);
return type;
}
} else if (type_a->is_matrix()) {
/* A is a matrix and B is a column vector. Columns of A must match
* rows of B. Given the other previously tested constraints, this
* means the vector type of a row from A must be the same as the
* vector the type of B.
*/
if (type_a->row_type() == type_b) {
/* The resulting vector has a number of elements equal to
* the number of rows of matrix A. */
const glsl_type *const type =
glsl_type::get_instance(type_a->base_type,
type_a->column_type()->vector_elements,
1);
assert(type != glsl_type::error_type);
return type;
}
} else {
assert(type_b->is_matrix());
/* A is a row vector and B is a matrix. Columns of A must match rows
* of B. Given the other previously tested constraints, this means
* the type of A must be the same as the vector type of a column from
* B.
*/
if (type_a == type_b->column_type()) {
/* The resulting vector has a number of elements equal to
* the number of columns of matrix B. */
const glsl_type *const type =
glsl_type::get_instance(type_a->base_type,
type_b->row_type()->vector_elements,
1);
assert(type != glsl_type::error_type);
return type;
}
}
_mesa_glsl_error(loc, state, "size mismatch for matrix multiplication");
return glsl_type::error_type;
}
/* "All other cases are illegal."
*/
_mesa_glsl_error(loc, state, "type mismatch");
return glsl_type::error_type;
}
static const struct glsl_type *
unary_arithmetic_result_type(const struct glsl_type *type,
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
{
/* From GLSL 1.50 spec, page 57:
*
* "The arithmetic unary operators negate (-), post- and pre-increment
* and decrement (-- and ++) operate on integer or floating-point
* values (including vectors and matrices). All unary operators work
* component-wise on their operands. These result with the same type
* they operated on."
*/
if (!type->is_numeric()) {
_mesa_glsl_error(loc, state,
"Operands to arithmetic operators must be numeric");
return glsl_type::error_type;
}
return type;
}
/**
* \brief Return the result type of a bit-logic operation.
*
* If the given types to the bit-logic operator are invalid, return
* glsl_type::error_type.
*
* \param type_a Type of LHS of bit-logic op
* \param type_b Type of RHS of bit-logic op
*/
static const struct glsl_type *
bit_logic_result_type(const struct glsl_type *type_a,
const struct glsl_type *type_b,
ast_operators op,
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
{
if (state->language_version < 130) {
_mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
return glsl_type::error_type;
}
/* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
*
* "The bitwise operators and (&), exclusive-or (^), and inclusive-or
* (|). The operands must be of type signed or unsigned integers or
* integer vectors."
*/
if (!type_a->is_integer()) {
_mesa_glsl_error(loc, state, "LHS of `%s' must be an integer",
ast_expression::operator_string(op));
return glsl_type::error_type;
}
if (!type_b->is_integer()) {
_mesa_glsl_error(loc, state, "RHS of `%s' must be an integer",
ast_expression::operator_string(op));
return glsl_type::error_type;
}
/* "The fundamental types of the operands (signed or unsigned) must
* match,"
*/
if (type_a->base_type != type_b->base_type) {
_mesa_glsl_error(loc, state, "operands of `%s' must have the same "
"base type", ast_expression::operator_string(op));
return glsl_type::error_type;
}
/* "The operands cannot be vectors of differing size." */
if (type_a->is_vector() &&
type_b->is_vector() &&
type_a->vector_elements != type_b->vector_elements) {
_mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of "
"different sizes", ast_expression::operator_string(op));
return glsl_type::error_type;
}
/* "If one operand is a scalar and the other a vector, the scalar is
* applied component-wise to the vector, resulting in the same type as
* the vector. The fundamental types of the operands [...] will be the
* resulting fundamental type."
*/
if (type_a->is_scalar())
return type_b;
else
return type_a;
}
static const struct glsl_type *
modulus_result_type(const struct glsl_type *type_a,
const struct glsl_type *type_b,
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
{
if (state->language_version < 130) {
_mesa_glsl_error(loc, state,
"operator '%%' is reserved in %s",
state->version_string);
return glsl_type::error_type;
}
/* From GLSL 1.50 spec, page 56:
* "The operator modulus (%) operates on signed or unsigned integers or
* integer vectors. The operand types must both be signed or both be
* unsigned."
*/
if (!type_a->is_integer()) {
_mesa_glsl_error(loc, state, "LHS of operator %% must be an integer.");
return glsl_type::error_type;
}
if (!type_b->is_integer()) {
_mesa_glsl_error(loc, state, "RHS of operator %% must be an integer.");
return glsl_type::error_type;
}
if (type_a->base_type != type_b->base_type) {
_mesa_glsl_error(loc, state,
"operands of %% must have the same base type");
return glsl_type::error_type;
}
/* "The operands cannot be vectors of differing size. If one operand is
* a scalar and the other vector, then the scalar is applied component-
* wise to the vector, resulting in the same type as the vector. If both
* are vectors of the same size, the result is computed component-wise."
*/
if (type_a->is_vector()) {
if (!type_b->is_vector()
|| (type_a->vector_elements == type_b->vector_elements))
return type_a;
} else
return type_b;
/* "The operator modulus (%) is not defined for any other data types
* (non-integer types)."
*/
_mesa_glsl_error(loc, state, "type mismatch");
return glsl_type::error_type;
}
static const struct glsl_type *
relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
{
const glsl_type *type_a = value_a->type;
const glsl_type *type_b = value_b->type;
/* From GLSL 1.50 spec, page 56:
* "The relational operators greater than (>), less than (<), greater
* than or equal (>=), and less than or equal (<=) operate only on
* scalar integer and scalar floating-point expressions."
*/
if (!type_a->is_numeric()
|| !type_b->is_numeric()
|| !type_a->is_scalar()
|| !type_b->is_scalar()) {
_mesa_glsl_error(loc, state,
"Operands to relational operators must be scalar and "
"numeric");
return glsl_type::error_type;
}
/* "Either the operands' types must match, or the conversions from
* Section 4.1.10 "Implicit Conversions" will be applied to the integer
* operand, after which the types must match."
*/
if (!apply_implicit_conversion(type_a, value_b, state)
&& !apply_implicit_conversion(type_b, value_a, state)) {
_mesa_glsl_error(loc, state,
"Could not implicitly convert operands to "
"relational operator");
return glsl_type::error_type;
}
type_a = value_a->type;
type_b = value_b->type;
if (type_a->base_type != type_b->base_type) {
_mesa_glsl_error(loc, state, "base type mismatch");
return glsl_type::error_type;
}
/* "The result is scalar Boolean."
*/
return glsl_type::bool_type;
}
/**
* \brief Return the result type of a bit-shift operation.
*
* If the given types to the bit-shift operator are invalid, return
* glsl_type::error_type.
*
* \param type_a Type of LHS of bit-shift op
* \param type_b Type of RHS of bit-shift op
*/
static const struct glsl_type *
shift_result_type(const struct glsl_type *type_a,
const struct glsl_type *type_b,
ast_operators op,
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
{
if (state->language_version < 130) {
_mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
return glsl_type::error_type;
}
/* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
*
* "The shift operators (<<) and (>>). For both operators, the operands
* must be signed or unsigned integers or integer vectors. One operand
* can be signed while the other is unsigned."
*/
if (!type_a->is_integer()) {
_mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
"integer vector", ast_expression::operator_string(op));
return glsl_type::error_type;
}
if (!type_b->is_integer()) {
_mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
"integer vector", ast_expression::operator_string(op));
return glsl_type::error_type;
}
/* "If the first operand is a scalar, the second operand has to be
* a scalar as well."
*/
if (type_a->is_scalar() && !type_b->is_scalar()) {
_mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the "
"second must be scalar as well",
ast_expression::operator_string(op));
return glsl_type::error_type;
}
/* If both operands are vectors, check that they have same number of
* elements.
*/
if (type_a->is_vector() &&
type_b->is_vector() &&
type_a->vector_elements != type_b->vector_elements) {
_mesa_glsl_error(loc, state, "Vector operands to operator %s must "
"have same number of elements",
ast_expression::operator_string(op));
return glsl_type::error_type;
}
/* "In all cases, the resulting type will be the same type as the left
* operand."
*/
return type_a;
}
/**
* Validates that a value can be assigned to a location with a specified type
*
* Validates that \c rhs can be assigned to some location. If the types are
* not an exact match but an automatic conversion is possible, \c rhs will be
* converted.
*
* \return
* \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
* Otherwise the actual RHS to be assigned will be returned. This may be
* \c rhs, or it may be \c rhs after some type conversion.
*
* \note
* In addition to being used for assignments, this function is used to
* type-check return values.
*/
ir_rvalue *
validate_assignment(struct _mesa_glsl_parse_state *state,
const glsl_type *lhs_type, ir_rvalue *rhs,
bool is_initializer)
{
/* If there is already some error in the RHS, just return it. Anything
* else will lead to an avalanche of error message back to the user.
*/
if (rhs->type->is_error())
return rhs;
/* If the types are identical, the assignment can trivially proceed.
*/
if (rhs->type == lhs_type)
return rhs;
/* If the array element types are the same and the size of the LHS is zero,
* the assignment is okay for initializers embedded in variable
* declarations.
*
* Note: Whole-array assignments are not permitted in GLSL 1.10, but this
* is handled by ir_dereference::is_lvalue.
*/
if (is_initializer && lhs_type->is_array() && rhs->type->is_array()
&& (lhs_type->element_type() == rhs->type->element_type())
&& (lhs_type->array_size() == 0)) {
return rhs;
}
/* Check for implicit conversion in GLSL 1.20 */
if (apply_implicit_conversion(lhs_type, rhs, state)) {
if (rhs->type == lhs_type)
return rhs;
}
return NULL;
}
static void
mark_whole_array_access(ir_rvalue *access)
{
ir_dereference_variable *deref = access->as_dereference_variable();
if (deref && deref->var) {
deref->var->max_array_access = deref->type->length - 1;
}
}
ir_rvalue *
do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
const char *non_lvalue_description,
ir_rvalue *lhs, ir_rvalue *rhs, bool is_initializer,
YYLTYPE lhs_loc)
{
void *ctx = state;
bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
ir_variable *lhs_var = lhs->variable_referenced();
if (lhs_var)
lhs_var->assigned = true;
if (!error_emitted) {
if (non_lvalue_description != NULL) {
_mesa_glsl_error(&lhs_loc, state,
"assignment to %s",
non_lvalue_description);
error_emitted = true;
} else if (lhs->variable_referenced() != NULL
&& lhs->variable_referenced()->read_only) {
_mesa_glsl_error(&lhs_loc, state,
"assignment to read-only variable '%s'",
lhs->variable_referenced()->name);
error_emitted = true;
} else if (state->language_version <= 110 && lhs->type->is_array()) {
/* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
*
* "Other binary or unary expressions, non-dereferenced
* arrays, function names, swizzles with repeated fields,
* and constants cannot be l-values."
*/
_mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
"allowed in GLSL 1.10 or GLSL ES 1.00.");
error_emitted = true;
} else if (!lhs->is_lvalue()) {
_mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
error_emitted = true;
}
}
ir_rvalue *new_rhs =
validate_assignment(state, lhs->type, rhs, is_initializer);
if (new_rhs == NULL) {
_mesa_glsl_error(& lhs_loc, state, "type mismatch");
} else {
rhs = new_rhs;
/* If the LHS array was not declared with a size, it takes it size from
* the RHS. If the LHS is an l-value and a whole array, it must be a
* dereference of a variable. Any other case would require that the LHS
* is either not an l-value or not a whole array.
*/
if (lhs->type->array_size() == 0) {
ir_dereference *const d = lhs->as_dereference();
assert(d != NULL);
ir_variable *const var = d->variable_referenced();
assert(var != NULL);
if (var->max_array_access >= unsigned(rhs->type->array_size())) {
/* FINISHME: This should actually log the location of the RHS. */
_mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
"previous access",
var->max_array_access);
}
var->type = glsl_type::get_array_instance(lhs->type->element_type(),
rhs->type->array_size());
d->type = var->type;
}
mark_whole_array_access(rhs);
mark_whole_array_access(lhs);
}
/* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
* but not post_inc) need the converted assigned value as an rvalue
* to handle things like:
*
* i = j += 1;
*
* So we always just store the computed value being assigned to a
* temporary and return a deref of that temporary. If the rvalue
* ends up not being used, the temp will get copy-propagated out.
*/
ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
ir_var_temporary);
ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var);
instructions->push_tail(var);
instructions->push_tail(new(ctx) ir_assignment(deref_var, rhs));
deref_var = new(ctx) ir_dereference_variable(var);
if (!error_emitted)
instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var));
return new(ctx) ir_dereference_variable(var);
}
static ir_rvalue *
get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
{
void *ctx = ralloc_parent(lvalue);
ir_variable *var;
var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
ir_var_temporary);
instructions->push_tail(var);
var->mode = ir_var_auto;
instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
lvalue));
return new(ctx) ir_dereference_variable(var);
}
ir_rvalue *
ast_node::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
(void) instructions;
(void) state;
return NULL;
}
static ir_rvalue *
do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
{
int join_op;
ir_rvalue *cmp = NULL;
if (operation == ir_binop_all_equal)
join_op = ir_binop_logic_and;
else
join_op = ir_binop_logic_or;
switch (op0->type->base_type) {
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
case GLSL_TYPE_BOOL:
return new(mem_ctx) ir_expression(operation, op0, op1);
case GLSL_TYPE_ARRAY: {
for (unsigned int i = 0; i < op0->type->length; i++) {
ir_rvalue *e0, *e1, *result;
e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL),
new(mem_ctx) ir_constant(i));
e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL),
new(mem_ctx) ir_constant(i));
result = do_comparison(mem_ctx, operation, e0, e1);
if (cmp) {
cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
} else {
cmp = result;
}
}
mark_whole_array_access(op0);
mark_whole_array_access(op1);
break;
}
case GLSL_TYPE_STRUCT: {
for (unsigned int i = 0; i < op0->type->length; i++) {
ir_rvalue *e0, *e1, *result;
const char *field_name = op0->type->fields.structure[i].name;
e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL),
field_name);
e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL),
field_name);
result = do_comparison(mem_ctx, operation, e0, e1);
if (cmp) {
cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
} else {
cmp = result;
}
}
break;
}
case GLSL_TYPE_ERROR:
case GLSL_TYPE_VOID:
case GLSL_TYPE_SAMPLER:
/* I assume a comparison of a struct containing a sampler just
* ignores the sampler present in the type.
*/
break;
default:
assert(!"Should not get here.");
break;
}
if (cmp == NULL)
cmp = new(mem_ctx) ir_constant(true);
return cmp;
}
/* For logical operations, we want to ensure that the operands are
* scalar booleans. If it isn't, emit an error and return a constant
* boolean to avoid triggering cascading error messages.
*/
ir_rvalue *
get_scalar_boolean_operand(exec_list *instructions,
struct _mesa_glsl_parse_state *state,
ast_expression *parent_expr,
int operand,
const char *operand_name,
bool *error_emitted)
{
ast_expression *expr = parent_expr->subexpressions[operand];
void *ctx = state;
ir_rvalue *val = expr->hir(instructions, state);
if (val->type->is_boolean() && val->type->is_scalar())
return val;
if (!*error_emitted) {
YYLTYPE loc = expr->get_location();
_mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean",
operand_name,
parent_expr->operator_string(parent_expr->oper));
*error_emitted = true;
}
return new(ctx) ir_constant(true);
}
/**
* If name refers to a builtin array whose maximum allowed size is less than
* size, report an error and return true. Otherwise return false.
*/
static bool
check_builtin_array_max_size(const char *name, unsigned size,
YYLTYPE loc, struct _mesa_glsl_parse_state *state)
{
if ((strcmp("gl_TexCoord", name) == 0)
&& (size > state->Const.MaxTextureCoords)) {
/* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
*
* "The size [of gl_TexCoord] can be at most
* gl_MaxTextureCoords."
*/
_mesa_glsl_error(&loc, state, "`gl_TexCoord' array size cannot "
"be larger than gl_MaxTextureCoords (%u)\n",
state->Const.MaxTextureCoords);
return true;
} else if (strcmp("gl_ClipDistance", name) == 0
&& size > state->Const.MaxClipPlanes) {
/* From section 7.1 (Vertex Shader Special Variables) of the
* GLSL 1.30 spec:
*
* "The gl_ClipDistance array is predeclared as unsized and
* must be sized by the shader either redeclaring it with a
* size or indexing it only with integral constant
* expressions. ... The size can be at most
* gl_MaxClipDistances."
*/
_mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
"be larger than gl_MaxClipDistances (%u)\n",
state->Const.MaxClipPlanes);
return true;
}
return false;
}
/**
* Create the constant 1, of a which is appropriate for incrementing and
* decrementing values of the given GLSL type. For example, if type is vec4,
* this creates a constant value of 1.0 having type float.
*
* If the given type is invalid for increment and decrement operators, return
* a floating point 1--the error will be detected later.
*/
static ir_rvalue *
constant_one_for_inc_dec(void *ctx, const glsl_type *type)
{
switch (type->base_type) {
case GLSL_TYPE_UINT:
return new(ctx) ir_constant((unsigned) 1);
case GLSL_TYPE_INT:
return new(ctx) ir_constant(1);
default:
case GLSL_TYPE_FLOAT:
return new(ctx) ir_constant(1.0f);
}
}
ir_rvalue *
ast_expression::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
void *ctx = state;
static const int operations[AST_NUM_OPERATORS] = {
-1, /* ast_assign doesn't convert to ir_expression. */
-1, /* ast_plus doesn't convert to ir_expression. */
ir_unop_neg,
ir_binop_add,
ir_binop_sub,
ir_binop_mul,
ir_binop_div,
ir_binop_mod,
ir_binop_lshift,
ir_binop_rshift,
ir_binop_less,
ir_binop_greater,
ir_binop_lequal,
ir_binop_gequal,
ir_binop_all_equal,
ir_binop_any_nequal,
ir_binop_bit_and,
ir_binop_bit_xor,
ir_binop_bit_or,
ir_unop_bit_not,
ir_binop_logic_and,
ir_binop_logic_xor,
ir_binop_logic_or,
ir_unop_logic_not,
/* Note: The following block of expression types actually convert