0,0 → 1,3279 |
/* |
* 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 "ir.h" |
|
void |
_mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state) |
{ |
_mesa_glsl_initialize_variables(instructions, state); |
_mesa_glsl_initialize_functions(instructions, state); |
|
state->symbols->language_version = state->language_version; |
|
state->current_function = NULL; |
|
/* 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); |
} |
|
|
/** |
* 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() || !type_b->is_integer() |
|| (type_a->base_type != type_b->base_type)) { |
_mesa_glsl_error(loc, state, "type mismatch"); |
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) |
{ |
const glsl_type *rhs_type = rhs->type; |
|
/* 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. |
* |
* Note: Whole-array assignments are not permitted in GLSL 1.10, but this |
* is handled by ir_dereference::is_lvalue. |
*/ |
if (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)) { |
rhs_type = rhs->type; |
if (rhs_type == lhs_type) |
return rhs; |
} |
|
return NULL; |
} |
|
ir_rvalue * |
do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state, |
ir_rvalue *lhs, ir_rvalue *rhs, |
YYLTYPE lhs_loc) |
{ |
void *ctx = state; |
bool error_emitted = (lhs->type->is_error() || rhs->type->is_error()); |
|
if (!error_emitted) { |
if (!lhs->is_lvalue()) { |
_mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment"); |
error_emitted = true; |
} |
|
if (state->es_shader && lhs->type->is_array()) { |
_mesa_glsl_error(&lhs_loc, state, "whole array assignment is not " |
"allowed in GLSL ES 1.00."); |
error_emitted = true; |
} |
} |
|
ir_rvalue *new_rhs = validate_assignment(state, lhs->type, rhs); |
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; |
} |
} |
|
/* 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, |
NULL)); |
deref_var = new(ctx) ir_dereference_variable(var); |
|
if (!error_emitted) |
instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var, NULL)); |
|
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, NULL)); |
|
/* Once we've created this temporary, mark it read only so it's no |
* longer considered an lvalue. |
*/ |
var->read_only = true; |
|
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 void |
mark_whole_array_access(ir_rvalue *access) |
{ |
ir_dereference_variable *deref = access->as_dereference_variable(); |
|
if (deref) { |
deref->var->max_array_access = deref->type->length - 1; |
} |
} |
|
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; |
} |
|
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 |
* to multiple IR instructions. |
*/ |
ir_binop_mul, /* ast_mul_assign */ |
ir_binop_div, /* ast_div_assign */ |
ir_binop_mod, /* ast_mod_assign */ |
ir_binop_add, /* ast_add_assign */ |
ir_binop_sub, /* ast_sub_assign */ |
ir_binop_lshift, /* ast_ls_assign */ |
ir_binop_rshift, /* ast_rs_assign */ |
ir_binop_bit_and, /* ast_and_assign */ |
ir_binop_bit_xor, /* ast_xor_assign */ |
ir_binop_bit_or, /* ast_or_assign */ |
|
-1, /* ast_conditional doesn't convert to ir_expression. */ |
ir_binop_add, /* ast_pre_inc. */ |
ir_binop_sub, /* ast_pre_dec. */ |
ir_binop_add, /* ast_post_inc. */ |
ir_binop_sub, /* ast_post_dec. */ |
-1, /* ast_field_selection doesn't conv to ir_expression. */ |
-1, /* ast_array_index doesn't convert to ir_expression. */ |
-1, /* ast_function_call doesn't conv to ir_expression. */ |
-1, /* ast_identifier doesn't convert to ir_expression. */ |
-1, /* ast_int_constant doesn't convert to ir_expression. */ |
-1, /* ast_uint_constant doesn't conv to ir_expression. */ |
-1, /* ast_float_constant doesn't conv to ir_expression. */ |
-1, /* ast_bool_constant doesn't conv to ir_expression. */ |
-1, /* ast_sequence doesn't convert to ir_expression. */ |
}; |
ir_rvalue *result = NULL; |
ir_rvalue *op[3]; |
const struct glsl_type *type = glsl_type::error_type; |
bool error_emitted = false; |
YYLTYPE loc; |
|
loc = this->get_location(); |
|
switch (this->oper) { |
case ast_assign: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
result = do_assignment(instructions, state, op[0], op[1], |
this->subexpressions[0]->get_location()); |
error_emitted = result->type->is_error(); |
type = result->type; |
break; |
} |
|
case ast_plus: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
|
type = unary_arithmetic_result_type(op[0]->type, state, & loc); |
|
error_emitted = type->is_error(); |
|
result = op[0]; |
break; |
|
case ast_neg: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
|
type = unary_arithmetic_result_type(op[0]->type, state, & loc); |
|
error_emitted = type->is_error(); |
|
result = new(ctx) ir_expression(operations[this->oper], type, |
op[0], NULL); |
break; |
|
case ast_add: |
case ast_sub: |
case ast_mul: |
case ast_div: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
type = arithmetic_result_type(op[0], op[1], |
(this->oper == ast_mul), |
state, & loc); |
error_emitted = type->is_error(); |
|
result = new(ctx) ir_expression(operations[this->oper], type, |
op[0], op[1]); |
break; |
|
case ast_mod: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
type = modulus_result_type(op[0]->type, op[1]->type, state, & loc); |
|
assert(operations[this->oper] == ir_binop_mod); |
|
result = new(ctx) ir_expression(operations[this->oper], type, |
op[0], op[1]); |
error_emitted = type->is_error(); |
break; |
|
case ast_lshift: |
case ast_rshift: |
if (state->language_version < 130) { |
_mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30", |
operator_string(this->oper)); |
error_emitted = true; |
} |
|
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, |
&loc); |
result = new(ctx) ir_expression(operations[this->oper], type, |
op[0], op[1]); |
error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); |
break; |
|
case ast_less: |
case ast_greater: |
case ast_lequal: |
case ast_gequal: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
type = relational_result_type(op[0], op[1], state, & loc); |
|
/* The relational operators must either generate an error or result |
* in a scalar boolean. See page 57 of the GLSL 1.50 spec. |
*/ |
assert(type->is_error() |
|| ((type->base_type == GLSL_TYPE_BOOL) |
&& type->is_scalar())); |
|
result = new(ctx) ir_expression(operations[this->oper], type, |
op[0], op[1]); |
error_emitted = type->is_error(); |
break; |
|
case ast_nequal: |
case ast_equal: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
/* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec: |
* |
* "The equality operators equal (==), and not equal (!=) |
* operate on all types. They result in a scalar Boolean. If |
* the operand types do not match, then there must be a |
* conversion from Section 4.1.10 "Implicit Conversions" |
* applied to one operand that can make them match, in which |
* case this conversion is done." |
*/ |
if ((!apply_implicit_conversion(op[0]->type, op[1], state) |
&& !apply_implicit_conversion(op[1]->type, op[0], state)) |
|| (op[0]->type != op[1]->type)) { |
_mesa_glsl_error(& loc, state, "operands of `%s' must have the same " |
"type", (this->oper == ast_equal) ? "==" : "!="); |
error_emitted = true; |
} else if ((state->language_version <= 110) |
&& (op[0]->type->is_array() || op[1]->type->is_array())) { |
_mesa_glsl_error(& loc, state, "array comparisons forbidden in " |
"GLSL 1.10"); |
error_emitted = true; |
} |
|
result = do_comparison(ctx, operations[this->oper], op[0], op[1]); |
type = glsl_type::bool_type; |
|
assert(error_emitted || (result->type == glsl_type::bool_type)); |
break; |
|
case ast_bit_and: |
case ast_bit_xor: |
case ast_bit_or: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper, |
state, &loc); |
result = new(ctx) ir_expression(operations[this->oper], type, |
op[0], op[1]); |
error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); |
break; |
|
case ast_bit_not: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
|
if (state->language_version < 130) { |
_mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30"); |
error_emitted = true; |
} |
|
if (!op[0]->type->is_integer()) { |
_mesa_glsl_error(&loc, state, "operand of `~' must be an integer"); |
error_emitted = true; |
} |
|
type = op[0]->type; |
result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL); |
break; |
|
case ast_logic_and: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
|
if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) { |
YYLTYPE loc = this->subexpressions[0]->get_location(); |
|
_mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean", |
operator_string(this->oper)); |
error_emitted = true; |
} |
|
ir_constant *op0_const = op[0]->constant_expression_value(); |
if (op0_const) { |
if (op0_const->value.b[0]) { |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) { |
YYLTYPE loc = this->subexpressions[1]->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"RHS of `%s' must be scalar boolean", |
operator_string(this->oper)); |
error_emitted = true; |
} |
result = op[1]; |
} else { |
result = op0_const; |
} |
type = glsl_type::bool_type; |
} else { |
ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, |
"and_tmp", |
ir_var_temporary); |
instructions->push_tail(tmp); |
|
ir_if *const stmt = new(ctx) ir_if(op[0]); |
instructions->push_tail(stmt); |
|
op[1] = this->subexpressions[1]->hir(&stmt->then_instructions, state); |
|
if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) { |
YYLTYPE loc = this->subexpressions[1]->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"RHS of `%s' must be scalar boolean", |
operator_string(this->oper)); |
error_emitted = true; |
} |
|
ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); |
ir_assignment *const then_assign = |
new(ctx) ir_assignment(then_deref, op[1], NULL); |
stmt->then_instructions.push_tail(then_assign); |
|
ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); |
ir_assignment *const else_assign = |
new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false), NULL); |
stmt->else_instructions.push_tail(else_assign); |
|
result = new(ctx) ir_dereference_variable(tmp); |
type = tmp->type; |
} |
break; |
} |
|
case ast_logic_or: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
|
if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) { |
YYLTYPE loc = this->subexpressions[0]->get_location(); |
|
_mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean", |
operator_string(this->oper)); |
error_emitted = true; |
} |
|
ir_constant *op0_const = op[0]->constant_expression_value(); |
if (op0_const) { |
if (op0_const->value.b[0]) { |
result = op0_const; |
} else { |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) { |
YYLTYPE loc = this->subexpressions[1]->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"RHS of `%s' must be scalar boolean", |
operator_string(this->oper)); |
error_emitted = true; |
} |
result = op[1]; |
} |
type = glsl_type::bool_type; |
} else { |
ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type, |
"or_tmp", |
ir_var_temporary); |
instructions->push_tail(tmp); |
|
ir_if *const stmt = new(ctx) ir_if(op[0]); |
instructions->push_tail(stmt); |
|
op[1] = this->subexpressions[1]->hir(&stmt->else_instructions, state); |
|
if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) { |
YYLTYPE loc = this->subexpressions[1]->get_location(); |
|
_mesa_glsl_error(& loc, state, "RHS of `%s' must be scalar boolean", |
operator_string(this->oper)); |
error_emitted = true; |
} |
|
ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp); |
ir_assignment *const then_assign = |
new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true), NULL); |
stmt->then_instructions.push_tail(then_assign); |
|
ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp); |
ir_assignment *const else_assign = |
new(ctx) ir_assignment(else_deref, op[1], NULL); |
stmt->else_instructions.push_tail(else_assign); |
|
result = new(ctx) ir_dereference_variable(tmp); |
type = tmp->type; |
} |
break; |
} |
|
case ast_logic_xor: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
|
result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, |
op[0], op[1]); |
type = glsl_type::bool_type; |
break; |
|
case ast_logic_not: |
op[0] = this->subexpressions[0]->hir(instructions, state); |
|
if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) { |
YYLTYPE loc = this->subexpressions[0]->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"operand of `!' must be scalar boolean"); |
error_emitted = true; |
} |
|
result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type, |
op[0], NULL); |
type = glsl_type::bool_type; |
break; |
|
case ast_mul_assign: |
case ast_div_assign: |
case ast_add_assign: |
case ast_sub_assign: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
type = arithmetic_result_type(op[0], op[1], |
(this->oper == ast_mul_assign), |
state, & loc); |
|
ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type, |
op[0], op[1]); |
|
result = do_assignment(instructions, state, |
op[0]->clone(ctx, NULL), temp_rhs, |
this->subexpressions[0]->get_location()); |
type = result->type; |
error_emitted = (op[0]->type->is_error()); |
|
/* GLSL 1.10 does not allow array assignment. However, we don't have to |
* explicitly test for this because none of the binary expression |
* operators allow array operands either. |
*/ |
|
break; |
} |
|
case ast_mod_assign: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
|
type = modulus_result_type(op[0]->type, op[1]->type, state, & loc); |
|
assert(operations[this->oper] == ir_binop_mod); |
|
ir_rvalue *temp_rhs; |
temp_rhs = new(ctx) ir_expression(operations[this->oper], type, |
op[0], op[1]); |
|
result = do_assignment(instructions, state, |
op[0]->clone(ctx, NULL), temp_rhs, |
this->subexpressions[0]->get_location()); |
type = result->type; |
error_emitted = type->is_error(); |
break; |
} |
|
case ast_ls_assign: |
case ast_rs_assign: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
type = shift_result_type(op[0]->type, op[1]->type, this->oper, state, |
&loc); |
ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], |
type, op[0], op[1]); |
result = do_assignment(instructions, state, op[0]->clone(ctx, NULL), |
temp_rhs, |
this->subexpressions[0]->get_location()); |
error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); |
break; |
} |
|
case ast_and_assign: |
case ast_xor_assign: |
case ast_or_assign: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
op[1] = this->subexpressions[1]->hir(instructions, state); |
type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper, |
state, &loc); |
ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], |
type, op[0], op[1]); |
result = do_assignment(instructions, state, op[0]->clone(ctx, NULL), |
temp_rhs, |
this->subexpressions[0]->get_location()); |
error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); |
break; |
} |
|
case ast_conditional: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
|
/* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: |
* |
* "The ternary selection operator (?:). It operates on three |
* expressions (exp1 ? exp2 : exp3). This operator evaluates the |
* first expression, which must result in a scalar Boolean." |
*/ |
if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) { |
YYLTYPE loc = this->subexpressions[0]->get_location(); |
|
_mesa_glsl_error(& loc, state, "?: condition must be scalar boolean"); |
error_emitted = true; |
} |
|
/* The :? operator is implemented by generating an anonymous temporary |
* followed by an if-statement. The last instruction in each branch of |
* the if-statement assigns a value to the anonymous temporary. This |
* temporary is the r-value of the expression. |
*/ |
exec_list then_instructions; |
exec_list else_instructions; |
|
op[1] = this->subexpressions[1]->hir(&then_instructions, state); |
op[2] = this->subexpressions[2]->hir(&else_instructions, state); |
|
/* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec: |
* |
* "The second and third expressions can be any type, as |
* long their types match, or there is a conversion in |
* Section 4.1.10 "Implicit Conversions" that can be applied |
* to one of the expressions to make their types match. This |
* resulting matching type is the type of the entire |
* expression." |
*/ |
if ((!apply_implicit_conversion(op[1]->type, op[2], state) |
&& !apply_implicit_conversion(op[2]->type, op[1], state)) |
|| (op[1]->type != op[2]->type)) { |
YYLTYPE loc = this->subexpressions[1]->get_location(); |
|
_mesa_glsl_error(& loc, state, "Second and third operands of ?: " |
"operator must have matching types."); |
error_emitted = true; |
type = glsl_type::error_type; |
} else { |
type = op[1]->type; |
} |
|
/* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec: |
* |
* "The second and third expressions must be the same type, but can |
* be of any type other than an array." |
*/ |
if ((state->language_version <= 110) && type->is_array()) { |
_mesa_glsl_error(& loc, state, "Second and third operands of ?: " |
"operator must not be arrays."); |
error_emitted = true; |
} |
|
ir_constant *cond_val = op[0]->constant_expression_value(); |
ir_constant *then_val = op[1]->constant_expression_value(); |
ir_constant *else_val = op[2]->constant_expression_value(); |
|
if (then_instructions.is_empty() |
&& else_instructions.is_empty() |
&& (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) { |
result = (cond_val->value.b[0]) ? then_val : else_val; |
} else { |
ir_variable *const tmp = |
new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary); |
instructions->push_tail(tmp); |
|
ir_if *const stmt = new(ctx) ir_if(op[0]); |
instructions->push_tail(stmt); |
|
then_instructions.move_nodes_to(& stmt->then_instructions); |
ir_dereference *const then_deref = |
new(ctx) ir_dereference_variable(tmp); |
ir_assignment *const then_assign = |
new(ctx) ir_assignment(then_deref, op[1], NULL); |
stmt->then_instructions.push_tail(then_assign); |
|
else_instructions.move_nodes_to(& stmt->else_instructions); |
ir_dereference *const else_deref = |
new(ctx) ir_dereference_variable(tmp); |
ir_assignment *const else_assign = |
new(ctx) ir_assignment(else_deref, op[2], NULL); |
stmt->else_instructions.push_tail(else_assign); |
|
result = new(ctx) ir_dereference_variable(tmp); |
} |
break; |
} |
|
case ast_pre_inc: |
case ast_pre_dec: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
if (op[0]->type->base_type == GLSL_TYPE_FLOAT) |
op[1] = new(ctx) ir_constant(1.0f); |
else |
op[1] = new(ctx) ir_constant(1); |
|
type = arithmetic_result_type(op[0], op[1], false, state, & loc); |
|
ir_rvalue *temp_rhs; |
temp_rhs = new(ctx) ir_expression(operations[this->oper], type, |
op[0], op[1]); |
|
result = do_assignment(instructions, state, |
op[0]->clone(ctx, NULL), temp_rhs, |
this->subexpressions[0]->get_location()); |
type = result->type; |
error_emitted = op[0]->type->is_error(); |
break; |
} |
|
case ast_post_inc: |
case ast_post_dec: { |
op[0] = this->subexpressions[0]->hir(instructions, state); |
if (op[0]->type->base_type == GLSL_TYPE_FLOAT) |
op[1] = new(ctx) ir_constant(1.0f); |
else |
op[1] = new(ctx) ir_constant(1); |
|
error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); |
|
type = arithmetic_result_type(op[0], op[1], false, state, & loc); |
|
ir_rvalue *temp_rhs; |
temp_rhs = new(ctx) ir_expression(operations[this->oper], type, |
op[0], op[1]); |
|
/* Get a temporary of a copy of the lvalue before it's modified. |
* This may get thrown away later. |
*/ |
result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL)); |
|
(void)do_assignment(instructions, state, |
op[0]->clone(ctx, NULL), temp_rhs, |
this->subexpressions[0]->get_location()); |
|
type = result->type; |
error_emitted = op[0]->type->is_error(); |
break; |
} |
|
case ast_field_selection: |
result = _mesa_ast_field_selection_to_hir(this, instructions, state); |
type = result->type; |
break; |
|
case ast_array_index: { |
YYLTYPE index_loc = subexpressions[1]->get_location(); |
|
op[0] = subexpressions[0]->hir(instructions, state); |
op[1] = subexpressions[1]->hir(instructions, state); |
|
error_emitted = op[0]->type->is_error() || op[1]->type->is_error(); |
|
ir_rvalue *const array = op[0]; |
|
result = new(ctx) ir_dereference_array(op[0], op[1]); |
|
/* Do not use op[0] after this point. Use array. |
*/ |
op[0] = NULL; |
|
|
if (error_emitted) |
break; |
|
if (!array->type->is_array() |
&& !array->type->is_matrix() |
&& !array->type->is_vector()) { |
_mesa_glsl_error(& index_loc, state, |
"cannot dereference non-array / non-matrix / " |
"non-vector"); |
error_emitted = true; |
} |
|
if (!op[1]->type->is_integer()) { |
_mesa_glsl_error(& index_loc, state, |
"array index must be integer type"); |
error_emitted = true; |
} else if (!op[1]->type->is_scalar()) { |
_mesa_glsl_error(& index_loc, state, |
"array index must be scalar"); |
error_emitted = true; |
} |
|
/* If the array index is a constant expression and the array has a |
* declared size, ensure that the access is in-bounds. If the array |
* index is not a constant expression, ensure that the array has a |
* declared size. |
*/ |
ir_constant *const const_index = op[1]->constant_expression_value(); |
if (const_index != NULL) { |
const int idx = const_index->value.i[0]; |
const char *type_name; |
unsigned bound = 0; |
|
if (array->type->is_matrix()) { |
type_name = "matrix"; |
} else if (array->type->is_vector()) { |
type_name = "vector"; |
} else { |
type_name = "array"; |
} |
|
/* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec: |
* |
* "It is illegal to declare an array with a size, and then |
* later (in the same shader) index the same array with an |
* integral constant expression greater than or equal to the |
* declared size. It is also illegal to index an array with a |
* negative constant expression." |
*/ |
if (array->type->is_matrix()) { |
if (array->type->row_type()->vector_elements <= idx) { |
bound = array->type->row_type()->vector_elements; |
} |
} else if (array->type->is_vector()) { |
if (array->type->vector_elements <= idx) { |
bound = array->type->vector_elements; |
} |
} else { |
if ((array->type->array_size() > 0) |
&& (array->type->array_size() <= idx)) { |
bound = array->type->array_size(); |
} |
} |
|
if (bound > 0) { |
_mesa_glsl_error(& loc, state, "%s index must be < %u", |
type_name, bound); |
error_emitted = true; |
} else if (idx < 0) { |
_mesa_glsl_error(& loc, state, "%s index must be >= 0", |
type_name); |
error_emitted = true; |
} |
|
if (array->type->is_array()) { |
/* If the array is a variable dereference, it dereferences the |
* whole array, by definition. Use this to get the variable. |
* |
* FINISHME: Should some methods for getting / setting / testing |
* FINISHME: array access limits be added to ir_dereference? |
*/ |
ir_variable *const v = array->whole_variable_referenced(); |
if ((v != NULL) && (unsigned(idx) > v->max_array_access)) |
v->max_array_access = idx; |
} |
} else if (array->type->array_size() == 0) { |
_mesa_glsl_error(&loc, state, "unsized array index must be constant"); |
} else { |
if (array->type->is_array()) { |
/* whole_variable_referenced can return NULL if the array is a |
* member of a structure. In this case it is safe to not update |
* the max_array_access field because it is never used for fields |
* of structures. |
*/ |
ir_variable *v = array->whole_variable_referenced(); |
if (v != NULL) |
v->max_array_access = array->type->array_size(); |
} |
} |
|
/* From page 23 (29 of the PDF) of the GLSL 1.30 spec: |
* |
* "Samplers aggregated into arrays within a shader (using square |
* brackets [ ]) can only be indexed with integral constant |
* expressions [...]." |
* |
* This restriction was added in GLSL 1.30. Shaders using earlier version |
* of the language should not be rejected by the compiler front-end for |
* using this construct. This allows useful things such as using a loop |
* counter as the index to an array of samplers. If the loop in unrolled, |
* the code should compile correctly. Instead, emit a warning. |
*/ |
if (array->type->is_array() && |
array->type->element_type()->is_sampler() && |
const_index == NULL) { |
|
if (state->language_version == 100) { |
_mesa_glsl_warning(&loc, state, |
"sampler arrays indexed with non-constant " |
"expressions is optional in GLSL ES 1.00"); |
} else if (state->language_version < 130) { |
_mesa_glsl_warning(&loc, state, |
"sampler arrays indexed with non-constant " |
"expressions is forbidden in GLSL 1.30 and " |
"later"); |
} else { |
_mesa_glsl_error(&loc, state, |
"sampler arrays indexed with non-constant " |
"expressions is forbidden in GLSL 1.30 and " |
"later"); |
error_emitted = true; |
} |
} |
|
if (error_emitted) |
result->type = glsl_type::error_type; |
|
type = result->type; |
break; |
} |
|
case ast_function_call: |
/* Should *NEVER* get here. ast_function_call should always be handled |
* by ast_function_expression::hir. |
*/ |
assert(0); |
break; |
|
case ast_identifier: { |
/* ast_identifier can appear several places in a full abstract syntax |
* tree. This particular use must be at location specified in the grammar |
* as 'variable_identifier'. |
*/ |
ir_variable *var = |
state->symbols->get_variable(this->primary_expression.identifier); |
|
result = new(ctx) ir_dereference_variable(var); |
|
if (var != NULL) { |
var->used = true; |
type = result->type; |
} else { |
_mesa_glsl_error(& loc, state, "`%s' undeclared", |
this->primary_expression.identifier); |
|
error_emitted = true; |
} |
break; |
} |
|
case ast_int_constant: |
type = glsl_type::int_type; |
result = new(ctx) ir_constant(this->primary_expression.int_constant); |
break; |
|
case ast_uint_constant: |
type = glsl_type::uint_type; |
result = new(ctx) ir_constant(this->primary_expression.uint_constant); |
break; |
|
case ast_float_constant: |
type = glsl_type::float_type; |
result = new(ctx) ir_constant(this->primary_expression.float_constant); |
break; |
|
case ast_bool_constant: |
type = glsl_type::bool_type; |
result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant)); |
break; |
|
case ast_sequence: { |
/* It should not be possible to generate a sequence in the AST without |
* any expressions in it. |
*/ |
assert(!this->expressions.is_empty()); |
|
/* The r-value of a sequence is the last expression in the sequence. If |
* the other expressions in the sequence do not have side-effects (and |
* therefore add instructions to the instruction list), they get dropped |
* on the floor. |
*/ |
foreach_list_typed (ast_node, ast, link, &this->expressions) |
result = ast->hir(instructions, state); |
|
type = result->type; |
|
/* Any errors should have already been emitted in the loop above. |
*/ |
error_emitted = true; |
break; |
} |
} |
|
if (type->is_error() && !error_emitted) |
_mesa_glsl_error(& loc, state, "type mismatch"); |
|
return result; |
} |
|
|
ir_rvalue * |
ast_expression_statement::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
/* It is possible to have expression statements that don't have an |
* expression. This is the solitary semicolon: |
* |
* for (i = 0; i < 5; i++) |
* ; |
* |
* In this case the expression will be NULL. Test for NULL and don't do |
* anything in that case. |
*/ |
if (expression != NULL) |
expression->hir(instructions, state); |
|
/* Statements do not have r-values. |
*/ |
return NULL; |
} |
|
|
ir_rvalue * |
ast_compound_statement::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
if (new_scope) |
state->symbols->push_scope(); |
|
foreach_list_typed (ast_node, ast, link, &this->statements) |
ast->hir(instructions, state); |
|
if (new_scope) |
state->symbols->pop_scope(); |
|
/* Compound statements do not have r-values. |
*/ |
return NULL; |
} |
|
|
static const glsl_type * |
process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size, |
struct _mesa_glsl_parse_state *state) |
{ |
unsigned length = 0; |
|
/* FINISHME: Reject delcarations of multidimensional arrays. */ |
|
if (array_size != NULL) { |
exec_list dummy_instructions; |
ir_rvalue *const ir = array_size->hir(& dummy_instructions, state); |
YYLTYPE loc = array_size->get_location(); |
|
/* FINISHME: Verify that the grammar forbids side-effects in array |
* FINISHME: sizes. i.e., 'vec4 [x = 12] data' |
*/ |
assert(dummy_instructions.is_empty()); |
|
if (ir != NULL) { |
if (!ir->type->is_integer()) { |
_mesa_glsl_error(& loc, state, "array size must be integer type"); |
} else if (!ir->type->is_scalar()) { |
_mesa_glsl_error(& loc, state, "array size must be scalar type"); |
} else { |
ir_constant *const size = ir->constant_expression_value(); |
|
if (size == NULL) { |
_mesa_glsl_error(& loc, state, "array size must be a " |
"constant valued expression"); |
} else if (size->value.i[0] <= 0) { |
_mesa_glsl_error(& loc, state, "array size must be > 0"); |
} else { |
assert(size->type == ir->type); |
length = size->value.u[0]; |
} |
} |
} |
} else if (state->es_shader) { |
/* Section 10.17 of the GLSL ES 1.00 specification states that unsized |
* array declarations have been removed from the language. |
*/ |
_mesa_glsl_error(loc, state, "unsized array declarations are not " |
"allowed in GLSL ES 1.00."); |
} |
|
return glsl_type::get_array_instance(base, length); |
} |
|
|
const glsl_type * |
ast_type_specifier::glsl_type(const char **name, |
struct _mesa_glsl_parse_state *state) const |
{ |
const struct glsl_type *type; |
|
type = state->symbols->get_type(this->type_name); |
*name = this->type_name; |
|
if (this->is_array) { |
YYLTYPE loc = this->get_location(); |
type = process_array_type(&loc, type, this->array_size, state); |
} |
|
return type; |
} |
|
|
static void |
apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual, |
ir_variable *var, |
struct _mesa_glsl_parse_state *state, |
YYLTYPE *loc) |
{ |
if (qual->flags.q.invariant) { |
if (var->used) { |
_mesa_glsl_error(loc, state, |
"variable `%s' may not be redeclared " |
"`invariant' after being used", |
var->name); |
} else { |
var->invariant = 1; |
} |
} |
|
if (qual->flags.q.constant || qual->flags.q.attribute |
|| qual->flags.q.uniform |
|| (qual->flags.q.varying && (state->target == fragment_shader))) |
var->read_only = 1; |
|
if (qual->flags.q.centroid) |
var->centroid = 1; |
|
if (qual->flags.q.attribute && state->target != vertex_shader) { |
var->type = glsl_type::error_type; |
_mesa_glsl_error(loc, state, |
"`attribute' variables may not be declared in the " |
"%s shader", |
_mesa_glsl_shader_target_name(state->target)); |
} |
|
/* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec: |
* |
* "The varying qualifier can be used only with the data types |
* float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of |
* these." |
*/ |
if (qual->flags.q.varying) { |
const glsl_type *non_array_type; |
|
if (var->type && var->type->is_array()) |
non_array_type = var->type->fields.array; |
else |
non_array_type = var->type; |
|
if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) { |
var->type = glsl_type::error_type; |
_mesa_glsl_error(loc, state, |
"varying variables must be of base type float"); |
} |
} |
|
/* If there is no qualifier that changes the mode of the variable, leave |
* the setting alone. |
*/ |
if (qual->flags.q.in && qual->flags.q.out) |
var->mode = ir_var_inout; |
else if (qual->flags.q.attribute || qual->flags.q.in |
|| (qual->flags.q.varying && (state->target == fragment_shader))) |
var->mode = ir_var_in; |
else if (qual->flags.q.out |
|| (qual->flags.q.varying && (state->target == vertex_shader))) |
var->mode = ir_var_out; |
else if (qual->flags.q.uniform) |
var->mode = ir_var_uniform; |
|
if (state->all_invariant && (state->current_function == NULL)) { |
switch (state->target) { |
case vertex_shader: |
if (var->mode == ir_var_out) |
var->invariant = true; |
break; |
case geometry_shader: |
if ((var->mode == ir_var_in) || (var->mode == ir_var_out)) |
var->invariant = true; |
break; |
case fragment_shader: |
if (var->mode == ir_var_in) |
var->invariant = true; |
break; |
} |
} |
|
if (qual->flags.q.flat) |
var->interpolation = ir_var_flat; |
else if (qual->flags.q.noperspective) |
var->interpolation = ir_var_noperspective; |
else |
var->interpolation = ir_var_smooth; |
|
var->pixel_center_integer = qual->flags.q.pixel_center_integer; |
var->origin_upper_left = qual->flags.q.origin_upper_left; |
if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer) |
&& (strcmp(var->name, "gl_FragCoord") != 0)) { |
const char *const qual_string = (qual->flags.q.origin_upper_left) |
? "origin_upper_left" : "pixel_center_integer"; |
|
_mesa_glsl_error(loc, state, |
"layout qualifier `%s' can only be applied to " |
"fragment shader input `gl_FragCoord'", |
qual_string); |
} |
|
if (qual->flags.q.explicit_location) { |
const bool global_scope = (state->current_function == NULL); |
bool fail = false; |
const char *string = ""; |
|
/* In the vertex shader only shader inputs can be given explicit |
* locations. |
* |
* In the fragment shader only shader outputs can be given explicit |
* locations. |
*/ |
switch (state->target) { |
case vertex_shader: |
if (!global_scope || (var->mode != ir_var_in)) { |
fail = true; |
string = "input"; |
} |
break; |
|
case geometry_shader: |
_mesa_glsl_error(loc, state, |
"geometry shader variables cannot be given " |
"explicit locations\n"); |
break; |
|
case fragment_shader: |
if (!global_scope || (var->mode != ir_var_in)) { |
fail = true; |
string = "output"; |
} |
break; |
}; |
|
if (fail) { |
_mesa_glsl_error(loc, state, |
"only %s shader %s variables can be given an " |
"explicit location\n", |
_mesa_glsl_shader_target_name(state->target), |
string); |
} else { |
var->explicit_location = true; |
|
/* This bit of silliness is needed because invalid explicit locations |
* are supposed to be flagged during linking. Small negative values |
* biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias |
* built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS). |
* The linker needs to be able to differentiate these cases. This |
* ensures that negative values stay negative. |
*/ |
if (qual->location >= 0) { |
var->location = (state->target == vertex_shader) |
? (qual->location + VERT_ATTRIB_GENERIC0) |
: (qual->location + FRAG_RESULT_DATA0); |
} else { |
var->location = qual->location; |
} |
} |
} |
|
/* Does the declaration use the 'layout' keyword? |
*/ |
const bool uses_layout = qual->flags.q.pixel_center_integer |
|| qual->flags.q.origin_upper_left |
|| qual->flags.q.explicit_location; |
|
/* Does the declaration use the deprecated 'attribute' or 'varying' |
* keywords? |
*/ |
const bool uses_deprecated_qualifier = qual->flags.q.attribute |
|| qual->flags.q.varying; |
|
/* Is the 'layout' keyword used with parameters that allow relaxed checking. |
* Many implementations of GL_ARB_fragment_coord_conventions_enable and some |
* implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable |
* allowed the layout qualifier to be used with 'varying' and 'attribute'. |
* These extensions and all following extensions that add the 'layout' |
* keyword have been modified to require the use of 'in' or 'out'. |
* |
* The following extension do not allow the deprecated keywords: |
* |
* GL_AMD_conservative_depth |
* GL_ARB_gpu_shader5 |
* GL_ARB_separate_shader_objects |
* GL_ARB_tesselation_shader |
* GL_ARB_transform_feedback3 |
* GL_ARB_uniform_buffer_object |
* |
* It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5 |
* allow layout with the deprecated keywords. |
*/ |
const bool relaxed_layout_qualifier_checking = |
state->ARB_fragment_coord_conventions_enable; |
|
if (uses_layout && uses_deprecated_qualifier) { |
if (relaxed_layout_qualifier_checking) { |
_mesa_glsl_warning(loc, state, |
"`layout' qualifier may not be used with " |
"`attribute' or `varying'"); |
} else { |
_mesa_glsl_error(loc, state, |
"`layout' qualifier may not be used with " |
"`attribute' or `varying'"); |
} |
} |
|
if (var->type->is_array() && state->language_version != 110) { |
var->array_lvalue = true; |
} |
} |
|
|
ir_rvalue * |
ast_declarator_list::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
void *ctx = state; |
const struct glsl_type *decl_type; |
const char *type_name = NULL; |
ir_rvalue *result = NULL; |
YYLTYPE loc = this->get_location(); |
|
/* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec: |
* |
* "To ensure that a particular output variable is invariant, it is |
* necessary to use the invariant qualifier. It can either be used to |
* qualify a previously declared variable as being invariant |
* |
* invariant gl_Position; // make existing gl_Position be invariant" |
* |
* In these cases the parser will set the 'invariant' flag in the declarator |
* list, and the type will be NULL. |
*/ |
if (this->invariant) { |
assert(this->type == NULL); |
|
if (state->current_function != NULL) { |
_mesa_glsl_error(& loc, state, |
"All uses of `invariant' keyword must be at global " |
"scope\n"); |
} |
|
foreach_list_typed (ast_declaration, decl, link, &this->declarations) { |
assert(!decl->is_array); |
assert(decl->array_size == NULL); |
assert(decl->initializer == NULL); |
|
ir_variable *const earlier = |
state->symbols->get_variable(decl->identifier); |
if (earlier == NULL) { |
_mesa_glsl_error(& loc, state, |
"Undeclared variable `%s' cannot be marked " |
"invariant\n", decl->identifier); |
} else if ((state->target == vertex_shader) |
&& (earlier->mode != ir_var_out)) { |
_mesa_glsl_error(& loc, state, |
"`%s' cannot be marked invariant, vertex shader " |
"outputs only\n", decl->identifier); |
} else if ((state->target == fragment_shader) |
&& (earlier->mode != ir_var_in)) { |
_mesa_glsl_error(& loc, state, |
"`%s' cannot be marked invariant, fragment shader " |
"inputs only\n", decl->identifier); |
} else if (earlier->used) { |
_mesa_glsl_error(& loc, state, |
"variable `%s' may not be redeclared " |
"`invariant' after being used", |
earlier->name); |
} else { |
earlier->invariant = true; |
} |
} |
|
/* Invariant redeclarations do not have r-values. |
*/ |
return NULL; |
} |
|
assert(this->type != NULL); |
assert(!this->invariant); |
|
/* The type specifier may contain a structure definition. Process that |
* before any of the variable declarations. |
*/ |
(void) this->type->specifier->hir(instructions, state); |
|
decl_type = this->type->specifier->glsl_type(& type_name, state); |
if (this->declarations.is_empty()) { |
/* The only valid case where the declaration list can be empty is when |
* the declaration is setting the default precision of a built-in type |
* (e.g., 'precision highp vec4;'). |
*/ |
|
if (decl_type != NULL) { |
} else { |
_mesa_glsl_error(& loc, state, "incomplete declaration"); |
} |
} |
|
foreach_list_typed (ast_declaration, decl, link, &this->declarations) { |
const struct glsl_type *var_type; |
ir_variable *var; |
|
/* FINISHME: Emit a warning if a variable declaration shadows a |
* FINISHME: declaration at a higher scope. |
*/ |
|
if ((decl_type == NULL) || decl_type->is_void()) { |
if (type_name != NULL) { |
_mesa_glsl_error(& loc, state, |
"invalid type `%s' in declaration of `%s'", |
type_name, decl->identifier); |
} else { |
_mesa_glsl_error(& loc, state, |
"invalid type in declaration of `%s'", |
decl->identifier); |
} |
continue; |
} |
|
if (decl->is_array) { |
var_type = process_array_type(&loc, decl_type, decl->array_size, |
state); |
} else { |
var_type = decl_type; |
} |
|
var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto); |
|
/* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification; |
* |
* "Global variables can only use the qualifiers const, |
* attribute, uni form, or varying. Only one may be |
* specified. |
* |
* Local variables can only use the qualifier const." |
* |
* This is relaxed in GLSL 1.30. It is also relaxed by any extension |
* that adds the 'layout' keyword. |
*/ |
if ((state->language_version < 130) |
&& !state->ARB_explicit_attrib_location_enable |
&& !state->ARB_fragment_coord_conventions_enable) { |
if (this->type->qualifier.flags.q.out) { |
_mesa_glsl_error(& loc, state, |
"`out' qualifier in declaration of `%s' " |
"only valid for function parameters in %s.", |
decl->identifier, state->version_string); |
} |
if (this->type->qualifier.flags.q.in) { |
_mesa_glsl_error(& loc, state, |
"`in' qualifier in declaration of `%s' " |
"only valid for function parameters in %s.", |
decl->identifier, state->version_string); |
} |
/* FINISHME: Test for other invalid qualifiers. */ |
} |
|
apply_type_qualifier_to_variable(& this->type->qualifier, var, state, |
& loc); |
|
if (this->type->qualifier.flags.q.invariant) { |
if ((state->target == vertex_shader) && !(var->mode == ir_var_out || |
var->mode == ir_var_inout)) { |
/* FINISHME: Note that this doesn't work for invariant on |
* a function signature outval |
*/ |
_mesa_glsl_error(& loc, state, |
"`%s' cannot be marked invariant, vertex shader " |
"outputs only\n", var->name); |
} else if ((state->target == fragment_shader) && |
!(var->mode == ir_var_in || var->mode == ir_var_inout)) { |
/* FINISHME: Note that this doesn't work for invariant on |
* a function signature inval |
*/ |
_mesa_glsl_error(& loc, state, |
"`%s' cannot be marked invariant, fragment shader " |
"inputs only\n", var->name); |
} |
} |
|
if (state->current_function != NULL) { |
const char *mode = NULL; |
const char *extra = ""; |
|
/* There is no need to check for 'inout' here because the parser will |
* only allow that in function parameter lists. |
*/ |
if (this->type->qualifier.flags.q.attribute) { |
mode = "attribute"; |
} else if (this->type->qualifier.flags.q.uniform) { |
mode = "uniform"; |
} else if (this->type->qualifier.flags.q.varying) { |
mode = "varying"; |
} else if (this->type->qualifier.flags.q.in) { |
mode = "in"; |
extra = " or in function parameter list"; |
} else if (this->type->qualifier.flags.q.out) { |
mode = "out"; |
extra = " or in function parameter list"; |
} |
|
if (mode) { |
_mesa_glsl_error(& loc, state, |
"%s variable `%s' must be declared at " |
"global scope%s", |
mode, var->name, extra); |
} |
} else if (var->mode == ir_var_in) { |
var->read_only = true; |
|
if (state->target == vertex_shader) { |
bool error_emitted = false; |
|
/* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec: |
* |
* "Vertex shader inputs can only be float, floating-point |
* vectors, matrices, signed and unsigned integers and integer |
* vectors. Vertex shader inputs can also form arrays of these |
* types, but not structures." |
* |
* From page 31 (page 27 of the PDF) of the GLSL 1.30 spec: |
* |
* "Vertex shader inputs can only be float, floating-point |
* vectors, matrices, signed and unsigned integers and integer |
* vectors. They cannot be arrays or structures." |
* |
* From page 23 (page 29 of the PDF) of the GLSL 1.20 spec: |
* |
* "The attribute qualifier can be used only with float, |
* floating-point vectors, and matrices. Attribute variables |
* cannot be declared as arrays or structures." |
*/ |
const glsl_type *check_type = var->type->is_array() |
? var->type->fields.array : var->type; |
|
switch (check_type->base_type) { |
case GLSL_TYPE_FLOAT: |
break; |
case GLSL_TYPE_UINT: |
case GLSL_TYPE_INT: |
if (state->language_version > 120) |
break; |
/* FALLTHROUGH */ |
default: |
_mesa_glsl_error(& loc, state, |
"vertex shader input / attribute cannot have " |
"type %s`%s'", |
var->type->is_array() ? "array of " : "", |
check_type->name); |
error_emitted = true; |
} |
|
if (!error_emitted && (state->language_version <= 130) |
&& var->type->is_array()) { |
_mesa_glsl_error(& loc, state, |
"vertex shader input / attribute cannot have " |
"array type"); |
error_emitted = true; |
} |
} |
} |
|
/* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30. |
*/ |
if (this->type->specifier->precision != ast_precision_none |
&& state->language_version != 100 |
&& state->language_version < 130) { |
|
_mesa_glsl_error(&loc, state, |
"precision qualifiers are supported only in GLSL ES " |
"1.00, and GLSL 1.30 and later"); |
} |
|
|
/* Precision qualifiers only apply to floating point and integer types. |
* |
* From section 4.5.2 of the GLSL 1.30 spec: |
* "Any floating point or any integer declaration can have the type |
* preceded by one of these precision qualifiers [...] Literal |
* constants do not have precision qualifiers. Neither do Boolean |
* variables. |
*/ |
if (this->type->specifier->precision != ast_precision_none |
&& !var->type->is_float() |
&& !var->type->is_integer() |
&& !(var->type->is_array() |
&& (var->type->fields.array->is_float() |
|| var->type->fields.array->is_integer()))) { |
|
_mesa_glsl_error(&loc, state, |
"precision qualifiers apply only to floating point " |
"and integer types"); |
} |
|
/* Process the initializer and add its instructions to a temporary |
* list. This list will be added to the instruction stream (below) after |
* the declaration is added. This is done because in some cases (such as |
* redeclarations) the declaration may not actually be added to the |
* instruction stream. |
*/ |
exec_list initializer_instructions; |
if (decl->initializer != NULL) { |
YYLTYPE initializer_loc = decl->initializer->get_location(); |
|
/* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec: |
* |
* "All uniform variables are read-only and are initialized either |
* directly by an application via API commands, or indirectly by |
* OpenGL." |
*/ |
if ((state->language_version <= 110) |
&& (var->mode == ir_var_uniform)) { |
_mesa_glsl_error(& initializer_loc, state, |
"cannot initialize uniforms in GLSL 1.10"); |
} |
|
if (var->type->is_sampler()) { |
_mesa_glsl_error(& initializer_loc, state, |
"cannot initialize samplers"); |
} |
|
if ((var->mode == ir_var_in) && (state->current_function == NULL)) { |
_mesa_glsl_error(& initializer_loc, state, |
"cannot initialize %s shader input / %s", |
_mesa_glsl_shader_target_name(state->target), |
(state->target == vertex_shader) |
? "attribute" : "varying"); |
} |
|
ir_dereference *const lhs = new(ctx) ir_dereference_variable(var); |
ir_rvalue *rhs = decl->initializer->hir(&initializer_instructions, |
state); |
|
/* Calculate the constant value if this is a const or uniform |
* declaration. |
*/ |
if (this->type->qualifier.flags.q.constant |
|| this->type->qualifier.flags.q.uniform) { |
ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs); |
if (new_rhs != NULL) { |
rhs = new_rhs; |
|
ir_constant *constant_value = rhs->constant_expression_value(); |
if (!constant_value) { |
_mesa_glsl_error(& initializer_loc, state, |
"initializer of %s variable `%s' must be a " |
"constant expression", |
(this->type->qualifier.flags.q.constant) |
? "const" : "uniform", |
decl->identifier); |
if (var->type->is_numeric()) { |
/* Reduce cascading errors. */ |
var->constant_value = ir_constant::zero(ctx, var->type); |
} |
} else { |
rhs = constant_value; |
var->constant_value = constant_value; |
} |
} else { |
_mesa_glsl_error(&initializer_loc, state, |
"initializer of type %s cannot be assigned to " |
"variable of type %s", |
rhs->type->name, var->type->name); |
if (var->type->is_numeric()) { |
/* Reduce cascading errors. */ |
var->constant_value = ir_constant::zero(ctx, var->type); |
} |
} |
} |
|
if (rhs && !rhs->type->is_error()) { |
bool temp = var->read_only; |
if (this->type->qualifier.flags.q.constant) |
var->read_only = false; |
|
/* Never emit code to initialize a uniform. |
*/ |
const glsl_type *initializer_type; |
if (!this->type->qualifier.flags.q.uniform) { |
result = do_assignment(&initializer_instructions, state, |
lhs, rhs, |
this->get_location()); |
initializer_type = result->type; |
} else |
initializer_type = rhs->type; |
|
/* If the declared variable is an unsized array, it must inherrit |
* its full type from the initializer. A declaration such as |
* |
* uniform float a[] = float[](1.0, 2.0, 3.0, 3.0); |
* |
* becomes |
* |
* uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0); |
* |
* The assignment generated in the if-statement (below) will also |
* automatically handle this case for non-uniforms. |
* |
* If the declared variable is not an array, the types must |
* already match exactly. As a result, the type assignment |
* here can be done unconditionally. For non-uniforms the call |
* to do_assignment can change the type of the initializer (via |
* the implicit conversion rules). For uniforms the initializer |
* must be a constant expression, and the type of that expression |
* was validated above. |
*/ |
var->type = initializer_type; |
|
var->read_only = temp; |
} |
} |
|
/* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec: |
* |
* "It is an error to write to a const variable outside of |
* its declaration, so they must be initialized when |
* declared." |
*/ |
if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) { |
_mesa_glsl_error(& loc, state, |
"const declaration of `%s' must be initialized", |
decl->identifier); |
} |
|
/* Check if this declaration is actually a re-declaration, either to |
* resize an array or add qualifiers to an existing variable. |
* |
* This is allowed for variables in the current scope, or when at |
* global scope (for built-ins in the implicit outer scope). |
*/ |
ir_variable *earlier = state->symbols->get_variable(decl->identifier); |
if (earlier != NULL && (state->current_function == NULL || |
state->symbols->name_declared_this_scope(decl->identifier))) { |
|
/* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec, |
* |
* "It is legal to declare an array without a size and then |
* later re-declare the same name as an array of the same |
* type and specify a size." |
*/ |
if ((earlier->type->array_size() == 0) |
&& var->type->is_array() |
&& (var->type->element_type() == earlier->type->element_type())) { |
/* FINISHME: This doesn't match the qualifiers on the two |
* FINISHME: declarations. It's not 100% clear whether this is |
* FINISHME: required or not. |
*/ |
|
/* 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." |
*/ |
const unsigned size = unsigned(var->type->array_size()); |
if ((strcmp("gl_TexCoord", var->name) == 0) |
&& (size > state->Const.MaxTextureCoords)) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, "`gl_TexCoord' array size cannot " |
"be larger than gl_MaxTextureCoords (%u)\n", |
state->Const.MaxTextureCoords); |
} else if ((size > 0) && (size <= earlier->max_array_access)) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, "array size must be > %u due to " |
"previous access", |
earlier->max_array_access); |
} |
|
earlier->type = var->type; |
delete var; |
var = NULL; |
} else if (state->ARB_fragment_coord_conventions_enable |
&& strcmp(var->name, "gl_FragCoord") == 0 |
&& earlier->type == var->type |
&& earlier->mode == var->mode) { |
/* Allow redeclaration of gl_FragCoord for ARB_fcc layout |
* qualifiers. |
*/ |
earlier->origin_upper_left = var->origin_upper_left; |
earlier->pixel_center_integer = var->pixel_center_integer; |
} else { |
YYLTYPE loc = this->get_location(); |
_mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier); |
} |
|
continue; |
} |
|
/* By now, we know it's a new variable declaration (we didn't hit the |
* above "continue"). |
* |
* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec, |
* |
* "Identifiers starting with "gl_" are reserved for use by |
* OpenGL, and may not be declared in a shader as either a |
* variable or a function." |
*/ |
if (strncmp(decl->identifier, "gl_", 3) == 0) |
_mesa_glsl_error(& loc, state, |
"identifier `%s' uses reserved `gl_' prefix", |
decl->identifier); |
|
/* Add the variable to the symbol table. Note that the initializer's |
* IR was already processed earlier (though it hasn't been emitted yet), |
* without the variable in scope. |
* |
* This differs from most C-like languages, but it follows the GLSL |
* specification. From page 28 (page 34 of the PDF) of the GLSL 1.50 |
* spec: |
* |
* "Within a declaration, the scope of a name starts immediately |
* after the initializer if present or immediately after the name |
* being declared if not." |
*/ |
if (!state->symbols->add_variable(var)) { |
YYLTYPE loc = this->get_location(); |
_mesa_glsl_error(&loc, state, "name `%s' already taken in the " |
"current scope", decl->identifier); |
continue; |
} |
|
/* Push the variable declaration to the top. It means that all |
* the variable declarations will appear in a funny |
* last-to-first order, but otherwise we run into trouble if a |
* function is prototyped, a global var is decled, then the |
* function is defined with usage of the global var. See |
* glslparsertest's CorrectModule.frag. |
*/ |
instructions->push_head(var); |
instructions->append_list(&initializer_instructions); |
} |
|
|
/* Generally, variable declarations do not have r-values. However, |
* one is used for the declaration in |
* |
* while (bool b = some_condition()) { |
* ... |
* } |
* |
* so we return the rvalue from the last seen declaration here. |
*/ |
return result; |
} |
|
|
ir_rvalue * |
ast_parameter_declarator::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
void *ctx = state; |
const struct glsl_type *type; |
const char *name = NULL; |
YYLTYPE loc = this->get_location(); |
|
type = this->type->specifier->glsl_type(& name, state); |
|
if (type == NULL) { |
if (name != NULL) { |
_mesa_glsl_error(& loc, state, |
"invalid type `%s' in declaration of `%s'", |
name, this->identifier); |
} else { |
_mesa_glsl_error(& loc, state, |
"invalid type in declaration of `%s'", |
this->identifier); |
} |
|
type = glsl_type::error_type; |
} |
|
/* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec: |
* |
* "Functions that accept no input arguments need not use void in the |
* argument list because prototypes (or definitions) are required and |
* therefore there is no ambiguity when an empty argument list "( )" is |
* declared. The idiom "(void)" as a parameter list is provided for |
* convenience." |
* |
* Placing this check here prevents a void parameter being set up |
* for a function, which avoids tripping up checks for main taking |
* parameters and lookups of an unnamed symbol. |
*/ |
if (type->is_void()) { |
if (this->identifier != NULL) |
_mesa_glsl_error(& loc, state, |
"named parameter cannot have type `void'"); |
|
is_void = true; |
return NULL; |
} |
|
if (formal_parameter && (this->identifier == NULL)) { |
_mesa_glsl_error(& loc, state, "formal parameter lacks a name"); |
return NULL; |
} |
|
/* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...) |
* call already handled the "vec4[..] foo" case. |
*/ |
if (this->is_array) { |
type = process_array_type(&loc, type, this->array_size, state); |
} |
|
if (type->array_size() == 0) { |
_mesa_glsl_error(&loc, state, "arrays passed as parameters must have " |
"a declared size."); |
type = glsl_type::error_type; |
} |
|
is_void = false; |
ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in); |
|
/* Apply any specified qualifiers to the parameter declaration. Note that |
* for function parameters the default mode is 'in'. |
*/ |
apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc); |
|
instructions->push_tail(var); |
|
/* Parameter declarations do not have r-values. |
*/ |
return NULL; |
} |
|
|
void |
ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters, |
bool formal, |
exec_list *ir_parameters, |
_mesa_glsl_parse_state *state) |
{ |
ast_parameter_declarator *void_param = NULL; |
unsigned count = 0; |
|
foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) { |
param->formal_parameter = formal; |
param->hir(ir_parameters, state); |
|
if (param->is_void) |
void_param = param; |
|
count++; |
} |
|
if ((void_param != NULL) && (count > 1)) { |
YYLTYPE loc = void_param->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"`void' parameter must be only parameter"); |
} |
} |
|
|
void |
emit_function(_mesa_glsl_parse_state *state, exec_list *instructions, |
ir_function *f) |
{ |
/* Emit the new function header */ |
if (state->current_function == NULL) { |
instructions->push_tail(f); |
} else { |
/* IR invariants disallow function declarations or definitions nested |
* within other function definitions. Insert the new ir_function |
* block in the instruction sequence before the ir_function block |
* containing the current ir_function_signature. |
*/ |
ir_function *const curr = |
const_cast<ir_function *>(state->current_function->function()); |
|
curr->insert_before(f); |
} |
} |
|
|
ir_rvalue * |
ast_function::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
void *ctx = state; |
ir_function *f = NULL; |
ir_function_signature *sig = NULL; |
exec_list hir_parameters; |
|
const char *const name = identifier; |
|
/* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec, |
* |
* "Function declarations (prototypes) cannot occur inside of functions; |
* they must be at global scope, or for the built-in functions, outside |
* the global scope." |
* |
* From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec, |
* |
* "User defined functions may only be defined within the global scope." |
* |
* Note that this language does not appear in GLSL 1.10. |
*/ |
if ((state->current_function != NULL) && (state->language_version != 110)) { |
YYLTYPE loc = this->get_location(); |
_mesa_glsl_error(&loc, state, |
"declaration of function `%s' not allowed within " |
"function body", name); |
} |
|
/* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec, |
* |
* "Identifiers starting with "gl_" are reserved for use by |
* OpenGL, and may not be declared in a shader as either a |
* variable or a function." |
*/ |
if (strncmp(name, "gl_", 3) == 0) { |
YYLTYPE loc = this->get_location(); |
_mesa_glsl_error(&loc, state, |
"identifier `%s' uses reserved `gl_' prefix", name); |
} |
|
/* Convert the list of function parameters to HIR now so that they can be |
* used below to compare this function's signature with previously seen |
* signatures for functions with the same name. |
*/ |
ast_parameter_declarator::parameters_to_hir(& this->parameters, |
is_definition, |
& hir_parameters, state); |
|
const char *return_type_name; |
const glsl_type *return_type = |
this->return_type->specifier->glsl_type(& return_type_name, state); |
|
if (!return_type) { |
YYLTYPE loc = this->get_location(); |
_mesa_glsl_error(&loc, state, |
"function `%s' has undeclared return type `%s'", |
name, return_type_name); |
return_type = glsl_type::error_type; |
} |
|
/* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec: |
* "No qualifier is allowed on the return type of a function." |
*/ |
if (this->return_type->has_qualifiers()) { |
YYLTYPE loc = this->get_location(); |
_mesa_glsl_error(& loc, state, |
"function `%s' return type has qualifiers", name); |
} |
|
/* Verify that this function's signature either doesn't match a previously |
* seen signature for a function with the same name, or, if a match is found, |
* that the previously seen signature does not have an associated definition. |
*/ |
f = state->symbols->get_function(name); |
if (f != NULL && (state->es_shader || f->has_user_signature())) { |
sig = f->exact_matching_signature(&hir_parameters); |
if (sig != NULL) { |
const char *badvar = sig->qualifiers_match(&hir_parameters); |
if (badvar != NULL) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(&loc, state, "function `%s' parameter `%s' " |
"qualifiers don't match prototype", name, badvar); |
} |
|
if (sig->return_type != return_type) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(&loc, state, "function `%s' return type doesn't " |
"match prototype", name); |
} |
|
if (is_definition && sig->is_defined) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, "function `%s' redefined", name); |
} |
} |
} else { |
f = new(ctx) ir_function(name); |
if (!state->symbols->add_function(f)) { |
/* This function name shadows a non-function use of the same name. */ |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(&loc, state, "function name `%s' conflicts with " |
"non-function", name); |
return NULL; |
} |
|
emit_function(state, instructions, f); |
} |
|
/* Verify the return type of main() */ |
if (strcmp(name, "main") == 0) { |
if (! return_type->is_void()) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, "main() must return void"); |
} |
|
if (!hir_parameters.is_empty()) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, "main() must not take any parameters"); |
} |
} |
|
/* Finish storing the information about this new function in its signature. |
*/ |
if (sig == NULL) { |
sig = new(ctx) ir_function_signature(return_type); |
f->add_signature(sig); |
} |
|
sig->replace_parameters(&hir_parameters); |
signature = sig; |
|
/* Function declarations (prototypes) do not have r-values. |
*/ |
return NULL; |
} |
|
|
ir_rvalue * |
ast_function_definition::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
prototype->is_definition = true; |
prototype->hir(instructions, state); |
|
ir_function_signature *signature = prototype->signature; |
if (signature == NULL) |
return NULL; |
|
assert(state->current_function == NULL); |
state->current_function = signature; |
state->found_return = false; |
|
/* Duplicate parameters declared in the prototype as concrete variables. |
* Add these to the symbol table. |
*/ |
state->symbols->push_scope(); |
foreach_iter(exec_list_iterator, iter, signature->parameters) { |
ir_variable *const var = ((ir_instruction *) iter.get())->as_variable(); |
|
assert(var != NULL); |
|
/* The only way a parameter would "exist" is if two parameters have |
* the same name. |
*/ |
if (state->symbols->name_declared_this_scope(var->name)) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name); |
} else { |
state->symbols->add_variable(var); |
} |
} |
|
/* Convert the body of the function to HIR. */ |
this->body->hir(&signature->body, state); |
signature->is_defined = true; |
|
state->symbols->pop_scope(); |
|
assert(state->current_function == signature); |
state->current_function = NULL; |
|
if (!signature->return_type->is_void() && !state->found_return) { |
YYLTYPE loc = this->get_location(); |
_mesa_glsl_error(& loc, state, "function `%s' has non-void return type " |
"%s, but no return statement", |
signature->function_name(), |
signature->return_type->name); |
} |
|
/* Function definitions do not have r-values. |
*/ |
return NULL; |
} |
|
|
ir_rvalue * |
ast_jump_statement::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
void *ctx = state; |
|
switch (mode) { |
case ast_return: { |
ir_return *inst; |
assert(state->current_function); |
|
if (opt_return_value) { |
ir_rvalue *const ret = opt_return_value->hir(instructions, state); |
|
/* The value of the return type can be NULL if the shader says |
* 'return foo();' and foo() is a function that returns void. |
* |
* NOTE: The GLSL spec doesn't say that this is an error. The type |
* of the return value is void. If the return type of the function is |
* also void, then this should compile without error. Seriously. |
*/ |
const glsl_type *const ret_type = |
(ret == NULL) ? glsl_type::void_type : ret->type; |
|
/* Implicit conversions are not allowed for return values. */ |
if (state->current_function->return_type != ret_type) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"`return' with wrong type %s, in function `%s' " |
"returning %s", |
ret_type->name, |
state->current_function->function_name(), |
state->current_function->return_type->name); |
} |
|
inst = new(ctx) ir_return(ret); |
} else { |
if (state->current_function->return_type->base_type != |
GLSL_TYPE_VOID) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"`return' with no value, in function %s returning " |
"non-void", |
state->current_function->function_name()); |
} |
inst = new(ctx) ir_return; |
} |
|
state->found_return = true; |
instructions->push_tail(inst); |
break; |
} |
|
case ast_discard: |
if (state->target != fragment_shader) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"`discard' may only appear in a fragment shader"); |
} |
instructions->push_tail(new(ctx) ir_discard); |
break; |
|
case ast_break: |
case ast_continue: |
/* FINISHME: Handle switch-statements. They cannot contain 'continue', |
* FINISHME: and they use a different IR instruction for 'break'. |
*/ |
/* FINISHME: Correctly handle the nesting. If a switch-statement is |
* FINISHME: inside a loop, a 'continue' is valid and will bind to the |
* FINISHME: loop. |
*/ |
if (state->loop_or_switch_nesting == NULL) { |
YYLTYPE loc = this->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"`%s' may only appear in a loop", |
(mode == ast_break) ? "break" : "continue"); |
} else { |
ir_loop *const loop = state->loop_or_switch_nesting->as_loop(); |
|
/* Inline the for loop expression again, since we don't know |
* where near the end of the loop body the normal copy of it |
* is going to be placed. |
*/ |
if (mode == ast_continue && |
state->loop_or_switch_nesting_ast->rest_expression) { |
state->loop_or_switch_nesting_ast->rest_expression->hir(instructions, |
state); |
} |
|
if (loop != NULL) { |
ir_loop_jump *const jump = |
new(ctx) ir_loop_jump((mode == ast_break) |
? ir_loop_jump::jump_break |
: ir_loop_jump::jump_continue); |
instructions->push_tail(jump); |
} |
} |
|
break; |
} |
|
/* Jump instructions do not have r-values. |
*/ |
return NULL; |
} |
|
|
ir_rvalue * |
ast_selection_statement::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
void *ctx = state; |
|
ir_rvalue *const condition = this->condition->hir(instructions, state); |
|
/* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec: |
* |
* "Any expression whose type evaluates to a Boolean can be used as the |
* conditional expression bool-expression. Vector types are not accepted |
* as the expression to if." |
* |
* The checks are separated so that higher quality diagnostics can be |
* generated for cases where both rules are violated. |
*/ |
if (!condition->type->is_boolean() || !condition->type->is_scalar()) { |
YYLTYPE loc = this->condition->get_location(); |
|
_mesa_glsl_error(& loc, state, "if-statement condition must be scalar " |
"boolean"); |
} |
|
ir_if *const stmt = new(ctx) ir_if(condition); |
|
if (then_statement != NULL) { |
state->symbols->push_scope(); |
then_statement->hir(& stmt->then_instructions, state); |
state->symbols->pop_scope(); |
} |
|
if (else_statement != NULL) { |
state->symbols->push_scope(); |
else_statement->hir(& stmt->else_instructions, state); |
state->symbols->pop_scope(); |
} |
|
instructions->push_tail(stmt); |
|
/* if-statements do not have r-values. |
*/ |
return NULL; |
} |
|
|
void |
ast_iteration_statement::condition_to_hir(ir_loop *stmt, |
struct _mesa_glsl_parse_state *state) |
{ |
void *ctx = state; |
|
if (condition != NULL) { |
ir_rvalue *const cond = |
condition->hir(& stmt->body_instructions, state); |
|
if ((cond == NULL) |
|| !cond->type->is_boolean() || !cond->type->is_scalar()) { |
YYLTYPE loc = condition->get_location(); |
|
_mesa_glsl_error(& loc, state, |
"loop condition must be scalar boolean"); |
} else { |
/* As the first code in the loop body, generate a block that looks |
* like 'if (!condition) break;' as the loop termination condition. |
*/ |
ir_rvalue *const not_cond = |
new(ctx) ir_expression(ir_unop_logic_not, glsl_type::bool_type, cond, |
NULL); |
|
ir_if *const if_stmt = new(ctx) ir_if(not_cond); |
|
ir_jump *const break_stmt = |
new(ctx) ir_loop_jump(ir_loop_jump::jump_break); |
|
if_stmt->then_instructions.push_tail(break_stmt); |
stmt->body_instructions.push_tail(if_stmt); |
} |
} |
} |
|
|
ir_rvalue * |
ast_iteration_statement::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
void *ctx = state; |
|
/* For-loops and while-loops start a new scope, but do-while loops do not. |
*/ |
if (mode != ast_do_while) |
state->symbols->push_scope(); |
|
if (init_statement != NULL) |
init_statement->hir(instructions, state); |
|
ir_loop *const stmt = new(ctx) ir_loop(); |
instructions->push_tail(stmt); |
|
/* Track the current loop and / or switch-statement nesting. |
*/ |
ir_instruction *const nesting = state->loop_or_switch_nesting; |
ast_iteration_statement *nesting_ast = state->loop_or_switch_nesting_ast; |
|
state->loop_or_switch_nesting = stmt; |
state->loop_or_switch_nesting_ast = this; |
|
if (mode != ast_do_while) |
condition_to_hir(stmt, state); |
|
if (body != NULL) |
body->hir(& stmt->body_instructions, state); |
|
if (rest_expression != NULL) |
rest_expression->hir(& stmt->body_instructions, state); |
|
if (mode == ast_do_while) |
condition_to_hir(stmt, state); |
|
if (mode != ast_do_while) |
state->symbols->pop_scope(); |
|
/* Restore previous nesting before returning. |
*/ |
state->loop_or_switch_nesting = nesting; |
state->loop_or_switch_nesting_ast = nesting_ast; |
|
/* Loops do not have r-values. |
*/ |
return NULL; |
} |
|
|
ir_rvalue * |
ast_type_specifier::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
if (!this->is_precision_statement && this->structure == NULL) |
return NULL; |
|
YYLTYPE loc = this->get_location(); |
|
if (this->precision != ast_precision_none |
&& state->language_version != 100 |
&& state->language_version < 130) { |
_mesa_glsl_error(&loc, state, |
"precision qualifiers exist only in " |
"GLSL ES 1.00, and GLSL 1.30 and later"); |
return NULL; |
} |
if (this->precision != ast_precision_none |
&& this->structure != NULL) { |
_mesa_glsl_error(&loc, state, |
"precision qualifiers do not apply to structures"); |
return NULL; |
} |
|
/* If this is a precision statement, check that the type to which it is |
* applied is either float or int. |
* |
* From section 4.5.3 of the GLSL 1.30 spec: |
* "The precision statement |
* precision precision-qualifier type; |
* can be used to establish a default precision qualifier. The type |
* field can be either int or float [...]. Any other types or |
* qualifiers will result in an error. |
*/ |
if (this->is_precision_statement) { |
assert(this->precision != ast_precision_none); |
assert(this->structure == NULL); /* The check for structures was |
* performed above. */ |
if (this->is_array) { |
_mesa_glsl_error(&loc, state, |
"default precision statements do not apply to " |
"arrays"); |
return NULL; |
} |
if (this->type_specifier != ast_float |
&& this->type_specifier != ast_int) { |
_mesa_glsl_error(&loc, state, |
"default precision statements apply only to types " |
"float and int"); |
return NULL; |
} |
|
/* FINISHME: Translate precision statements into IR. */ |
return NULL; |
} |
|
if (this->structure != NULL) |
return this->structure->hir(instructions, state); |
|
return NULL; |
} |
|
|
ir_rvalue * |
ast_struct_specifier::hir(exec_list *instructions, |
struct _mesa_glsl_parse_state *state) |
{ |
unsigned decl_count = 0; |
|
/* Make an initial pass over the list of structure fields to determine how |
* many there are. Each element in this list is an ast_declarator_list. |
* This means that we actually need to count the number of elements in the |
* 'declarations' list in each of the elements. |
*/ |
foreach_list_typed (ast_declarator_list, decl_list, link, |
&this->declarations) { |
foreach_list_const (decl_ptr, & decl_list->declarations) { |
decl_count++; |
} |
} |
|
/* Allocate storage for the structure fields and process the field |
* declarations. As the declarations are processed, try to also convert |
* the types to HIR. This ensures that structure definitions embedded in |
* other structure definitions are processed. |
*/ |
glsl_struct_field *const fields = ralloc_array(state, glsl_struct_field, |
decl_count); |
|
unsigned i = 0; |
foreach_list_typed (ast_declarator_list, decl_list, link, |
&this->declarations) { |
const char *type_name; |
|
decl_list->type->specifier->hir(instructions, state); |
|
/* Section 10.9 of the GLSL ES 1.00 specification states that |
* embedded structure definitions have been removed from the language. |
*/ |
if (state->es_shader && decl_list->type->specifier->structure != NULL) { |
YYLTYPE loc = this->get_location(); |
_mesa_glsl_error(&loc, state, "Embedded structure definitions are " |
"not allowed in GLSL ES 1.00."); |
} |
|
const glsl_type *decl_type = |
decl_list->type->specifier->glsl_type(& type_name, state); |
|
foreach_list_typed (ast_declaration, decl, link, |
&decl_list->declarations) { |
const struct glsl_type *field_type = decl_type; |
if (decl->is_array) { |
YYLTYPE loc = decl->get_location(); |
field_type = process_array_type(&loc, decl_type, decl->array_size, |
state); |
} |
fields[i].type = (field_type != NULL) |
? field_type : glsl_type::error_type; |
fields[i].name = decl->identifier; |
i++; |
} |
} |
|
assert(i == decl_count); |
|
const glsl_type *t = |
glsl_type::get_record_instance(fields, decl_count, this->name); |
|
YYLTYPE loc = this->get_location(); |
if (!state->symbols->add_type(name, t)) { |
_mesa_glsl_error(& loc, state, "struct `%s' previously defined", name); |
} else { |
const glsl_type **s = reralloc(state, state->user_structures, |
const glsl_type *, |
state->num_user_structures + 1); |
if (s != NULL) { |
s[state->num_user_structures] = t; |
state->user_structures = s; |
state->num_user_structures++; |
} |
} |
|
/* Structure type definitions do not have r-values. |
*/ |
return NULL; |
} |