
This helps distinguish between lowering passes, optimization passes, and other compiler code.
154 lines
4.1 KiB
C++
154 lines
4.1 KiB
C++
/*
|
|
* 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 ir_dead_functions.cpp
|
|
*
|
|
* Eliminates unused functions from the linked program.
|
|
*/
|
|
|
|
#include "ir.h"
|
|
#include "ir_visitor.h"
|
|
#include "ir_expression_flattening.h"
|
|
#include "glsl_types.h"
|
|
|
|
class signature_entry : public exec_node
|
|
{
|
|
public:
|
|
signature_entry(ir_function_signature *sig)
|
|
{
|
|
this->signature = sig;
|
|
this->used = false;
|
|
}
|
|
|
|
ir_function_signature *signature;
|
|
bool used;
|
|
};
|
|
|
|
class ir_dead_functions_visitor : public ir_hierarchical_visitor {
|
|
public:
|
|
ir_dead_functions_visitor()
|
|
{
|
|
this->mem_ctx = talloc_new(NULL);
|
|
}
|
|
|
|
~ir_dead_functions_visitor()
|
|
{
|
|
talloc_free(this->mem_ctx);
|
|
}
|
|
|
|
virtual ir_visitor_status visit_enter(ir_function_signature *);
|
|
virtual ir_visitor_status visit_enter(ir_call *);
|
|
|
|
signature_entry *get_signature_entry(ir_function_signature *var);
|
|
|
|
bool (*predicate)(ir_instruction *ir);
|
|
|
|
/* List of signature_entry */
|
|
exec_list signature_list;
|
|
void *mem_ctx;
|
|
};
|
|
|
|
|
|
signature_entry *
|
|
ir_dead_functions_visitor::get_signature_entry(ir_function_signature *sig)
|
|
{
|
|
foreach_iter(exec_list_iterator, iter, this->signature_list) {
|
|
signature_entry *entry = (signature_entry *)iter.get();
|
|
if (entry->signature == sig)
|
|
return entry;
|
|
}
|
|
|
|
signature_entry *entry = new(mem_ctx) signature_entry(sig);
|
|
this->signature_list.push_tail(entry);
|
|
return entry;
|
|
}
|
|
|
|
|
|
ir_visitor_status
|
|
ir_dead_functions_visitor::visit_enter(ir_function_signature *ir)
|
|
{
|
|
signature_entry *entry = this->get_signature_entry(ir);
|
|
|
|
if (strcmp(ir->function_name(), "main") == 0) {
|
|
entry->used = true;
|
|
}
|
|
|
|
return visit_continue;
|
|
}
|
|
|
|
|
|
ir_visitor_status
|
|
ir_dead_functions_visitor::visit_enter(ir_call *ir)
|
|
{
|
|
signature_entry *entry = this->get_signature_entry(ir->get_callee());
|
|
|
|
entry->used = true;
|
|
|
|
return visit_continue;
|
|
}
|
|
|
|
bool
|
|
do_dead_functions(exec_list *instructions)
|
|
{
|
|
ir_dead_functions_visitor v;
|
|
bool progress = false;
|
|
|
|
visit_list_elements(&v, instructions);
|
|
|
|
/* Now that we've figured out which function signatures are used, remove
|
|
* the unused ones, and remove function definitions that have no more
|
|
* signatures.
|
|
*/
|
|
foreach_iter(exec_list_iterator, iter, v.signature_list) {
|
|
signature_entry *entry = (signature_entry *)iter.get();
|
|
|
|
if (!entry->used) {
|
|
entry->signature->remove();
|
|
delete entry->signature;
|
|
progress = true;
|
|
}
|
|
delete(entry);
|
|
}
|
|
|
|
/* We don't just do this above when we nuked a signature because of
|
|
* const pointers.
|
|
*/
|
|
foreach_iter(exec_list_iterator, iter, *instructions) {
|
|
ir_instruction *ir = (ir_instruction *)iter.get();
|
|
ir_function *func = ir->as_function();
|
|
|
|
if (func && func->signatures.is_empty()) {
|
|
/* At this point (post-linking), the symbol table is no
|
|
* longer in use, so not removing the function from the
|
|
* symbol table should be OK.
|
|
*/
|
|
func->remove();
|
|
delete func;
|
|
progress = true;
|
|
}
|
|
}
|
|
|
|
return progress;
|
|
}
|