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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 <cstdlib>
#include <cstdio>
#include <cstdarg>
extern "C" {
#include <talloc.h>
}
#include "main/mtypes.h"
#include "glsl_symbol_table.h"
#include "glsl_parser_extras.h"
#include "ir.h"
#include "program.h"
#include "hash_table.h"
#include "linker.h"
static ir_function_signature *
find_matching_signature(const char *name, const exec_list *actual_parameters,
gl_shader **shader_list, unsigned num_shaders);
class call_link_visitor : public ir_hierarchical_visitor {
public:
call_link_visitor(gl_shader_program *prog, gl_shader **shader_list,
unsigned num_shaders)
{
this->prog = prog;
this->shader_list = shader_list;
this->num_shaders = num_shaders;
this->success = true;
}
virtual ir_visitor_status visit_enter(ir_call *ir)
{
/* If the function call references a function signature that does not
* have a definition, try to find the definition in one of the other
* shaders.
*/
ir_function_signature *callee =
const_cast<ir_function_signature *>(ir->get_callee());
assert(callee != NULL);
if (callee->is_defined)
/* FINISHME: Do children need to be processed, or are all parameters
* FINISHME: with function calls already flattend?
*/
return visit_continue;
const char *const name = callee->function_name();
ir_function_signature *sig =
find_matching_signature(name, &ir->actual_parameters, shader_list,
num_shaders);
if (sig == NULL) {
/* FINISHME: Log the full signature of unresolved function.
*/
linker_error_printf(this->prog, "unresolved reference to function "
"`%s'\n", name);
this->success = false;
return visit_stop;
}
/* Create an in-place clone of the function definition. This multistep
* process introduces some complexity here, but it has some advantages.
* The parameter list and the and function body are cloned separately.
* The clone of the parameter list is used to prime the hashtable used
* to replace variable references in the cloned body.
*
* The big advantage is that the ir_function_signature does not change.
* This means that we don't have to process the rest of the IR tree to
* patch ir_call nodes. In addition, there is no way to remove or replace
* signature stored in a function. One could easily be added, but this
* avoids the need.
*/
struct hash_table *ht = hash_table_ctor(0, hash_table_pointer_hash,
hash_table_pointer_compare);
exec_list formal_parameters;
foreach_list_const(node, &sig->parameters) {
const ir_instruction *const original = (ir_instruction *) node;
assert(const_cast<ir_instruction *>(original)->as_variable());
ir_instruction *copy = original->clone(ht);
formal_parameters.push_tail(copy);
}
callee->replace_parameters(&formal_parameters);
assert(callee->body.is_empty());
foreach_list_const(node, &sig->body) {
const ir_instruction *const original = (ir_instruction *) node;
ir_instruction *copy = original->clone(ht);
callee->body.push_tail(copy);
}
callee->is_defined = true;
/* FINISHME: Patch references inside the function to things outside the
* FINISHME: function (i.e., function calls and global variables).
*/
hash_table_dtor(ht);
return visit_continue;
}
/** Was function linking successful? */
bool success;
private:
/**
* Shader program being linked
*
* This is only used for logging error messages.
*/
gl_shader_program *prog;
/** List of shaders available for linking. */
gl_shader **shader_list;
/** Number of shaders available for linking. */
unsigned num_shaders;
};
/**
* Searches a list of shaders for a particular function definition
*/
ir_function_signature *
find_matching_signature(const char *name, const exec_list *actual_parameters,
gl_shader **shader_list, unsigned num_shaders)
{
for (unsigned i = 0; i < num_shaders; i++) {
ir_function *const f = shader_list[i]->symbols->get_function(name);
if (f == NULL)
continue;
ir_function_signature *sig = f->matching_signature(actual_parameters);
if ((sig == NULL) || !sig->is_defined)
continue;
return sig;
}
return NULL;
}
bool
link_function_calls(gl_shader_program *prog, gl_shader *main,
gl_shader **shader_list, unsigned num_shaders)
{
call_link_visitor v(prog, shader_list, num_shaders);
v.run(main->ir);
return v.success;
}
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