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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 ir_variable_refcount.h
*
* Provides a visitor which produces a list of variables referenced,
* how many times they were referenced and assigned, and whether they
* were defined in the scope.
*/
#include "ir.h"
#include "ir_visitor.h"
#include "compiler/glsl_types.h"
struct assignment_entry {
exec_node link;
ir_assignment *assign;
};
class ir_variable_refcount_entry
{
public:
ir_variable_refcount_entry(ir_variable *var);
ir_variable *var; /* The key: the variable's pointer. */
/**
* List of assignments to the variable, if any.
* This is intended to be used for dead code optimisation and may
* not be a complete list.
*/
exec_list assign_list;
/** Number of times the variable is referenced, including assignments. */
unsigned referenced_count;
/** Number of times the variable is assigned. */
unsigned assigned_count;
bool declaration; /* If the variable had a decl in the instruction stream */
};
class ir_variable_refcount_visitor : public ir_hierarchical_visitor {
public:
ir_variable_refcount_visitor(void);
~ir_variable_refcount_visitor(void);
virtual ir_visitor_status visit(ir_variable *);
virtual ir_visitor_status visit(ir_dereference_variable *);
virtual ir_visitor_status visit_enter(ir_function_signature *);
virtual ir_visitor_status visit_leave(ir_assignment *);
ir_variable_refcount_entry *get_variable_entry(ir_variable *var);
struct hash_table *ht;
void *mem_ctx;
};
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