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/*
* Copyright © 2016 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_array_refcount.cpp
*
* Provides a visitor which produces a list of variables referenced.
*/
#include "ir.h"
#include "ir_visitor.h"
#include "ir_array_refcount.h"
#include "compiler/glsl_types.h"
#include "util/hash_table.h"
ir_array_refcount_visitor::ir_array_refcount_visitor()
{
this->mem_ctx = ralloc_context(NULL);
this->ht = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
_mesa_key_pointer_equal);
}
static void
free_entry(struct hash_entry *entry)
{
ir_array_refcount_entry *ivre = (ir_array_refcount_entry *) entry->data;
delete ivre;
}
ir_array_refcount_visitor::~ir_array_refcount_visitor()
{
ralloc_free(this->mem_ctx);
_mesa_hash_table_destroy(this->ht, free_entry);
}
ir_array_refcount_entry::ir_array_refcount_entry(ir_variable *var)
: var(var), is_referenced(false)
{
/* empty */
}
ir_array_refcount_entry *
ir_array_refcount_visitor::get_variable_entry(ir_variable *var)
{
assert(var);
struct hash_entry *e = _mesa_hash_table_search(this->ht, var);
if (e)
return (ir_array_refcount_entry *)e->data;
ir_array_refcount_entry *entry = new ir_array_refcount_entry(var);
_mesa_hash_table_insert(this->ht, var, entry);
return entry;
}
ir_visitor_status
ir_array_refcount_visitor::visit(ir_dereference_variable *ir)
{
ir_variable *const var = ir->variable_referenced();
ir_array_refcount_entry *entry = this->get_variable_entry(var);
entry->is_referenced = true;
return visit_continue;
}
ir_visitor_status
ir_array_refcount_visitor::visit_enter(ir_function_signature *ir)
{
/* We don't want to descend into the function parameters and
* dead-code eliminate them, so just accept the body here.
*/
visit_list_elements(this, &ir->body);
return visit_continue_with_parent;
}
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