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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.
*/
#include <cstdio>
#include "glsl_symbol_table.h"
#include "ast.h"
#include "glsl_types.h"
#include "ir.h"
static ir_instruction *
match_function_by_name(exec_list *instructions, const char *name,
YYLTYPE *loc, simple_node *parameters,
struct _mesa_glsl_parse_state *state)
{
ir_function *f = state->symbols->get_function(name);
if (f == NULL) {
_mesa_glsl_error(loc, state, "function `%s' undeclared", name);
return ir_call::get_error_instruction();
}
/* Once we've determined that the function being called might exist,
* process the parameters.
*/
exec_list actual_parameters;
simple_node *const first = parameters;
if (first != NULL) {
simple_node *ptr = first;
do {
ir_instruction *const result =
((ast_node *) ptr)->hir(instructions, state);
ptr = ptr->next;
actual_parameters.push_tail(result);
} while (ptr != first);
}
/* After processing the function's actual parameters, try to find an
* overload of the function that matches.
*/
const ir_function_signature *sig =
f->matching_signature(& actual_parameters);
if (sig != NULL) {
/* FINISHME: The list of actual parameters needs to be modified to
* FINISHME: include any necessary conversions.
*/
return new ir_call(sig, & actual_parameters);
} else {
/* FINISHME: Log a better error message here. G++ will show the types
* FINISHME: of the actual parameters and the set of candidate
* FINISHME: functions. A different error should also be logged when
* FINISHME: multiple functions match.
*/
_mesa_glsl_error(loc, state, "no matching function for call to `%s'",
name);
return ir_call::get_error_instruction();
}
}
ir_instruction *
ast_function_expression::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
/* There are three sorts of function calls.
*
* 1. contstructors - The first subexpression is an ast_type_specifier.
* 2. methods - Only the .length() method of array types.
* 3. functions - Calls to regular old functions.
*
* There are two kinds of constructor call. Constructors for built-in
* language types, such as mat4 and vec2, are free form. The only
* requirement is that the parameters must provide enough values of the
* correct scalar type. Constructors for arrays and structures must have
* the exact number of parameters with matching types in the correct order.
* These constructors follow essentially the same type matching rules as
* functions.
*
* Method calls are actually detected when the ast_field_selection
* expression is handled.
*/
if (is_constructor()) {
return ir_call::get_error_instruction();
} else {
const ast_expression *id = subexpressions[0];
YYLTYPE loc = id->get_location();
return match_function_by_name(instructions,
id->primary_expression.identifier, & loc,
subexpressions[1], state);
}
return ir_call::get_error_instruction();
}
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