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e29a5859891eb9e1587396dea0e8010f7d88f68c
third_party_mesa3d/ast_to_hir.cpp
Ian Romanick e29a585989 Use ir_variable::clone to copy parameters to the function body 
Several other code movements were also done.  This partitions this
function into two halves.  The first half processes the prototype
part, and the second have processes the actual function definition.
The coming patch series will parition ast_function_definition::hir
into (at least) two separate functions.
2010-03-31 17:54:26 -07:00

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/*
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/**
* \file ast_to_hir.c
* Convert abstract syntax to to high-level intermediate reprensentation (HIR).
*
* During the conversion to HIR, the majority of the symantic checking is
* preformed on the program. This includes:
*
* * Symbol table management
* * Type checking
* * Function binding
*
* The majority of this work could be done during parsing, and the parser could
* probably generate HIR directly. However, this results in frequent changes
* to the parser code. Since we do not assume that every system this complier
* is built on will have Flex and Bison installed, we have to store the code
* generated by these tools in our version control system. In other parts of
* the system we've seen problems where a parser was changed but the generated
* code was not committed, merge conflicts where created because two developers
* had slightly different versions of Bison installed, etc.
*
* I have also noticed that running Bison generated parsers in GDB is very
* irritating. When you get a segfault on '$$ = $1->foo', you can't very
* well 'print $1' in GDB.
*
* As a result, my preference is to put as little C code as possible in the
* parser (and lexer) sources.
*/
#include <stdio.h>
#include "main/imports.h"
#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)
{
struct simple_node *ptr;
_mesa_glsl_initialize_variables(instructions, state);
_mesa_glsl_initialize_constructors(instructions, state);
_mesa_glsl_initialize_functions(instructions, state);
state->current_function = NULL;
foreach (ptr, & state->translation_unit) {
((ast_node *)ptr)->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.
*/
static bool
apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
struct _mesa_glsl_parse_state *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;
switch (from->type->base_type) {
case GLSL_TYPE_INT:
from = new ir_expression(ir_unop_i2f, to, from, NULL);
break;
case GLSL_TYPE_UINT:
from = new ir_expression(ir_unop_u2f, to, from, NULL);
break;
case GLSL_TYPE_BOOL:
assert(!"FINISHME: Convert bool to float.");
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)
{
const glsl_type *const type_a = value_a->type;
const glsl_type *const 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()) {
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)) {
return glsl_type::error_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) {
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()) {
return (type_a == type_b) ? type_a : 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) {
return (type_a == type_b) ? type_a : glsl_type::error_type;
} 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.
*/
return
glsl_type::get_instance(type_a->base_type,
type_a->column_type()->vector_elements,
type_b->row_type()->vector_elements);
}
} 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)
return type_b;
} 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())
return type_a;
}
}
/* "All other cases are illegal."
*/
return glsl_type::error_type;
}
static const struct glsl_type *
unary_arithmetic_result_type(const struct glsl_type *type)
{
/* 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())
return glsl_type::error_type;
return type;
}
static const struct glsl_type *
modulus_result_type(const struct glsl_type *type_a,
const struct glsl_type *type_b)
{
/* 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)) {
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)."
*/
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)
{
const glsl_type *const type_a = value_a->type;
const glsl_type *const 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())
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)) {
return glsl_type::error_type;
}
if (type_a->base_type != type_b->base_type)
return glsl_type::error_type;
/* "The result is scalar Boolean."
*/
return glsl_type::bool_type;
}
/**
* 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(const glsl_type *lhs_type, ir_rvalue *rhs)
{
const glsl_type *const 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;
/* FINISHME: For GLSL 1.10, check that the types are not arrays. */
/* If the types are identical, the assignment can trivially proceed.
*/
if (rhs_type == lhs_type)
return rhs;
/* FINISHME: Check for and apply automatic conversions. */
return NULL;
}
ir_rvalue *
do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
ir_rvalue *lhs, ir_rvalue *rhs,
YYLTYPE lhs_loc)
{
bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
if (!error_emitted) {
/* FINISHME: This does not handle 'foo.bar.a.b.c[5].d = 5' */
if (!lhs->is_lvalue()) {
_mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
error_emitted = true;
}
}
ir_rvalue *new_rhs = validate_assignment(lhs->type, rhs);
if (new_rhs == NULL) {
_mesa_glsl_error(& lhs_loc, state, "type mismatch");
} else {
rhs = new_rhs;
}
ir_instruction *tmp = new ir_assignment(lhs, rhs, NULL);
instructions->push_tail(tmp);
return rhs;
}
/**
* Generate a new temporary and add its declaration to the instruction stream
*/
static ir_variable *
generate_temporary(const glsl_type *type, exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
char *name = (char *) malloc(sizeof(char) * 13);
snprintf(name, 13, "tmp_%08X", state->temp_index);
state->temp_index++;
ir_variable *const var = new ir_variable(type, name);
instructions->push_tail(var);
return var;
}
static ir_rvalue *
get_lvalue_copy(exec_list *instructions, struct _mesa_glsl_parse_state *state,
ir_rvalue *lvalue, YYLTYPE loc)
{
ir_variable *var;
ir_rvalue *var_deref;
/* FINISHME: Give unique names to the temporaries. */
var = new ir_variable(lvalue->type, "_internal_tmp");
var->mode = ir_var_auto;
var_deref = new ir_dereference(var);
do_assignment(instructions, state, var_deref, lvalue, loc);
/* Once we've created this temporary, mark it read only so it's no
* longer considered an lvalue.
*/
var->read_only = true;
return var_deref;
}
ir_rvalue *
ast_node::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
(void) instructions;
(void) state;
return NULL;
}
ir_rvalue *
ast_expression::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *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_equal,
ir_binop_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[2];
struct simple_node op_list;
const struct glsl_type *type = glsl_type::error_type;
bool error_emitted = false;
YYLTYPE loc;
loc = this->get_location();
make_empty_list(& op_list);
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);
error_emitted = op[0]->type->is_error();
if (type->is_error())
op[0]->type = type;
result = op[0];
break;
case ast_neg:
op[0] = this->subexpressions[0]->hir(instructions, state);
type = unary_arithmetic_result_type(op[0]->type);
error_emitted = op[0]->type->is_error();
result = new 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);
result = new 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);
error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
type = modulus_result_type(op[0]->type, op[1]->type);
assert(operations[this->oper] == ir_binop_mod);
result = new ir_expression(operations[this->oper], type,
op[0], op[1]);
break;
case ast_lshift:
case ast_rshift:
/* FINISHME: Implement bit-shift operators. */
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);
error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
type = relational_result_type(op[0], op[1], state);
/* 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 ir_expression(operations[this->oper], type,
op[0], op[1]);
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 = new ir_expression(operations[this->oper], glsl_type::bool_type,
op[0], op[1]);
type = glsl_type::bool_type;
assert(result->type == glsl_type::bool_type);
break;
case ast_bit_and:
case ast_bit_xor:
case ast_bit_or:
case ast_bit_not:
/* FINISHME: Implement bit-wise operators. */
break;
case ast_logic_and:
case ast_logic_xor:
case ast_logic_or:
case ast_logic_not:
op[0] = this->subexpressions[0]->hir(instructions, state);
op[1] = this->subexpressions[1]->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));
}
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));
}
result = new ir_expression(operations[this->oper], glsl_type::bool_type,
op[0], op[1]);
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);
ir_rvalue *temp_rhs = new ir_expression(operations[this->oper], type,
op[0], op[1]);
result = do_assignment(instructions, state, op[0], 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);
error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
type = modulus_result_type(op[0]->type, op[1]->type);
assert(operations[this->oper] == ir_binop_mod);
struct ir_rvalue *temp_rhs;
temp_rhs = new ir_expression(operations[this->oper], type,
op[0], op[1]);
result = do_assignment(instructions, state, op[0], temp_rhs,
this->subexpressions[0]->get_location());
type = result->type;
error_emitted = op[0]->type->is_error();
break;
}
case ast_ls_assign:
case ast_rs_assign:
break;
case ast_and_assign:
case ast_xor_assign:
case ast_or_assign:
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.
*/
ir_variable *const tmp = generate_temporary(glsl_type::error_type,
instructions, state);
ir_if *const stmt = new ir_if(op[0]);
instructions->push_tail(stmt);
op[1] = this->subexpressions[1]->hir(& stmt->then_instructions, state);
ir_dereference *const then_deref = new ir_dereference(tmp);
ir_assignment *const then_assign =
new ir_assignment(then_deref, op[1], NULL);
stmt->then_instructions.push_tail(then_assign);
op[2] = this->subexpressions[2]->hir(& stmt->else_instructions, state);
ir_dereference *const else_deref = new ir_dereference(tmp);
ir_assignment *const else_assign =
new ir_assignment(else_deref, op[2], NULL);
stmt->else_instructions.push_tail(else_assign);
/* 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;
} else {
tmp->type = op[1]->type;
}
result = new ir_dereference(tmp);
type = tmp->type;
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 ir_constant(1.0f);
else
op[1] = new ir_constant(1);
type = arithmetic_result_type(op[0], op[1], false, state);
struct ir_rvalue *temp_rhs;
temp_rhs = new ir_expression(operations[this->oper], type,
op[0], op[1]);
result = do_assignment(instructions, state, op[0], 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 ir_constant(1.0f);
else
op[1] = new 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);
struct ir_rvalue *temp_rhs;
temp_rhs = new 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, state, op[0],
this->subexpressions[0]->get_location());
(void)do_assignment(instructions, state, op[0], 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:
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 ir_dereference(var);
if (var != NULL) {
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 ir_constant(type, & this->primary_expression);
break;
case ast_uint_constant:
type = glsl_type::uint_type;
result = new ir_constant(type, & this->primary_expression);
break;
case ast_float_constant:
type = glsl_type::float_type;
result = new ir_constant(type, & this->primary_expression);
break;
case ast_bool_constant:
type = glsl_type::bool_type;
result = new ir_constant(type, & this->primary_expression);
break;
case ast_sequence: {
struct simple_node *ptr;
/* It should not be possible to generate a sequence in the AST without
* any expressions in it.
*/
assert(!is_empty_list(&this->expressions));
/* 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 (ptr, &this->expressions)
result = ((ast_node *)ptr)->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)
{
struct simple_node *ptr;
if (new_scope)
state->symbols->push_scope();
foreach (ptr, &statements)
((ast_node *)ptr)->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(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];
}
}
}
}
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;
if (this->type_specifier == ast_struct) {
/* FINISHME: Handle annonymous structures. */
type = NULL;
} else {
type = state->symbols->get_type(this->type_name);
*name = this->type_name;
if (this->is_array) {
type = process_array_type(type, this->array_size, state);
}
}
return type;
}
static void
apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
struct ir_variable *var,
struct _mesa_glsl_parse_state *state,
YYLTYPE *loc)
{
if (qual->invariant)
var->invariant = 1;
/* FINISHME: Mark 'in' variables at global scope as read-only. */
if (qual->constant || qual->attribute || qual->uniform
|| (qual->varying && (state->target == fragment_shader)))
var->read_only = 1;
if (qual->centroid)
var->centroid = 1;
if (qual->attribute && state->target == fragment_shader) {
var->type = glsl_type::error_type;
_mesa_glsl_error(loc, state,
"`attribute' variables may not be declared in the "
"fragment shader");
}
if (qual->in && qual->out)
var->mode = ir_var_inout;
else if (qual->attribute || qual->in
|| (qual->varying && (state->target == fragment_shader)))
var->mode = ir_var_in;
else if (qual->out || (qual->varying && (state->target == vertex_shader)))
var->mode = ir_var_out;
else if (qual->uniform)
var->mode = ir_var_uniform;
else
var->mode = ir_var_auto;
if (qual->flat)
var->interpolation = ir_var_flat;
else if (qual->noperspective)
var->interpolation = ir_var_noperspective;
else
var->interpolation = ir_var_smooth;
}
ir_rvalue *
ast_declarator_list::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
struct simple_node *ptr;
const struct glsl_type *decl_type;
const char *type_name = NULL;
/* FINISHME: Handle vertex shader "invariant" declarations that do not
* FINISHME: include a type. These re-declare built-in variables to be
* FINISHME: invariant.
*/
decl_type = this->type->specifier->glsl_type(& type_name, state);
foreach (ptr, &this->declarations) {
struct ast_declaration *const decl = (struct ast_declaration * )ptr;
const struct glsl_type *var_type;
struct ir_variable *var;
YYLTYPE loc = this->get_location();
/* 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(decl_type, decl->array_size, state);
} else {
var_type = decl_type;
}
var = new ir_variable(var_type, decl->identifier);
apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
& loc);
/* Attempt to add the variable to the symbol table. If this fails, it
* means the variable has already been declared at this scope.
*/
if (state->symbols->name_declared_this_scope(decl->identifier)) {
YYLTYPE loc = this->get_location();
_mesa_glsl_error(& loc, state, "`%s' redeclared",
decl->identifier);
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) {
/* FINISHME: This should only trigger if we're not redefining
* FINISHME: a builtin (to add a qualifier, for example).
*/
_mesa_glsl_error(& loc, state,
"identifier `%s' uses reserved `gl_' prefix",
decl->identifier);
}
instructions->push_tail(var);
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.attribute) {
mode = "attribute";
} else if (this->type->qualifier.uniform) {
mode = "uniform";
} else if (this->type->qualifier.varying) {
mode = "varying";
} else if (this->type->qualifier.in) {
mode = "in";
extra = " or in function parameter list";
} else if (this->type->qualifier.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) {
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;
}
}
}
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",
(state->target == vertex_shader)
? "vertex" : "fragment",
(state->target == vertex_shader)
? "attribute" : "varying");
}
ir_dereference *const lhs = new ir_dereference(var);
ir_rvalue *const rhs = decl->initializer->hir(instructions, state);
/* FINISHME: If the declaration is either 'const' or 'uniform', the
* FINISHME: initializer (rhs) must be a constant expression.
*/
if (!rhs->type->is_error()) {
(void) do_assignment(instructions, state, lhs, rhs,
this->get_location());
}
}
/* 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.constant && decl->initializer == NULL) {
_mesa_glsl_error(& loc, state,
"const declaration of `%s' must be initialized");
}
/* Add the vairable to the symbol table after processing the initializer.
* 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."
*/
const bool added_variable =
state->symbols->add_variable(decl->identifier, var);
assert(added_variable);
}
/* Variable declarations do not have r-values.
*/
return NULL;
}
ir_rvalue *
ast_parameter_declarator::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *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;
}
ir_variable *var = new ir_variable(type, this->identifier);
/* FINISHME: Handle array declarations. Note that this requires
* FINISHME: complete handling of constant expressions.
*/
/* 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);
if (var->mode == ir_var_auto)
var->mode = ir_var_in;
instructions->push_tail(var);
/* Parameter declarations do not have r-values.
*/
return NULL;
}
static void
ast_function_parameters_to_hir(struct simple_node *ast_parameters,
exec_list *ir_parameters,
struct _mesa_glsl_parse_state *state)
{
struct simple_node *ptr;
foreach (ptr, ast_parameters) {
((ast_node *)ptr)->hir(ir_parameters, state);
}
}
static bool
parameter_lists_match(exec_list *list_a, exec_list *list_b)
{
exec_list_iterator iter_a = list_a->iterator();
exec_list_iterator iter_b = list_b->iterator();
while (iter_a.has_next()) {
/* If all of the parameters from the other parameter list have been
* exhausted, the lists have different length and, by definition,
* do not match.
*/
if (!iter_b.has_next())
return false;
/* If the types of the parameters do not match, the parameters lists
* are different.
*/
/* FINISHME */
iter_a.next();
iter_b.next();
}
return true;
}
ir_rvalue *
ast_function_definition::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
ir_label *label;
ir_function_signature *signature = NULL;
ir_function *f = NULL;
exec_list parameters;
/* 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_function_parameters_to_hir(& this->prototype->parameters, & parameters,
state);
const char *return_type_name;
const glsl_type *return_type =
this->prototype->return_type->specifier->glsl_type(& return_type_name,
state);
assert(return_type != NULL);
/* 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.
*/
const char *const name = this->prototype->identifier;
f = state->symbols->get_function(name);
if (f != NULL) {
foreach_iter(exec_list_iterator, iter, *f) {
signature = (struct ir_function_signature *) iter.get();
/* Compare the parameter list of the function being defined to the
* existing function. If the parameter lists match, then the return
* type must also match and the existing function must not have a
* definition.
*/
if (parameter_lists_match(& parameters, & signature->parameters)) {
/* FINISHME: Compare return types. */
if (signature->definition != NULL) {
YYLTYPE loc = this->get_location();
_mesa_glsl_error(& loc, state, "function `%s' redefined", name);
signature = NULL;
break;
}
}
signature = NULL;
}
} else if (state->symbols->name_declared_this_scope(name)) {
/* 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);
signature = NULL;
} else {
f = new ir_function(name);
state->symbols->add_function(f->name, 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 (!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 (signature == NULL) {
signature = new ir_function_signature(return_type);
f->add_signature(signature);
} else {
/* Destroy all of the previous parameter information. The previous
* parameter information comes from the function prototype, and it can
* either include invalid parameter names or may not have names at all.
*/
foreach_iter(exec_list_iterator, iter, signature->parameters) {
assert(((ir_instruction *) iter.get())->as_variable() != NULL);
iter.remove();
delete iter.get();
}
}
parameters.move_nodes_to(& signature->parameters);
assert(state->current_function == NULL);
state->current_function = signature;
label = new ir_label(name);
if (signature->definition == NULL) {
signature->definition = label;
}
instructions->push_tail(label);
/* 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 proto = ((ir_instruction *) iter.get())->as_variable();
assert(proto != NULL);
ir_variable *const var = proto->clone();
instructions->push_tail(var);
/* 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->name, var);
}
}
/* Convert the body of the function to HIR, and append the resulting
* instructions to the list that currently consists of the function label
* and the function parameters.
*/
this->body->hir(instructions, state);
state->symbols->pop_scope();
assert(state->current_function == signature);
state->current_function = NULL;
/* Function definitions do not have r-values.
*/
return NULL;
}
ir_rvalue *
ast_jump_statement::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
if (mode == ast_return) {
ir_return *inst;
assert(state->current_function);
if (opt_return_value) {
if (state->current_function->return_type->base_type ==
GLSL_TYPE_VOID) {
YYLTYPE loc = this->get_location();
_mesa_glsl_error(& loc, state,
"`return` with a value, in function `%s' "
"returning void",
state->current_function->definition->label);
}
ir_expression *const ret = (ir_expression *)
opt_return_value->hir(instructions, state);
assert(ret != NULL);
/* FINISHME: Make sure the type of the return value matches the return
* FINISHME: type of the enclosing function.
*/
inst = new 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->definition->label);
}
inst = new ir_return;
}
instructions->push_tail(inst);
}
if (mode == ast_discard) {
/* FINISHME: discard support */
if (state->target != fragment_shader) {
YYLTYPE loc = this->get_location();
_mesa_glsl_error(& loc, state,
"`discard' may only appear in a fragment shader");
}
}
/* Jump instructions do not have r-values.
*/
return NULL;
}
ir_rvalue *
ast_selection_statement::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *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 ir_if(condition);
if (then_statement != NULL) {
ast_node *node = (ast_node *) then_statement;
do {
node->hir(& stmt->then_instructions, state);
node = (ast_node *) node->next;
} while (node != then_statement);
}
if (else_statement != NULL) {
ast_node *node = (ast_node *) else_statement;
do {
node->hir(& stmt->else_instructions, state);
node = (ast_node *) node->next;
} while (node != else_statement);
}
instructions->push_tail(stmt);
/* if-statements do not have r-values.
*/
return NULL;
}
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