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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_COMPILER_DEX_PASS_H_
#define ART_COMPILER_DEX_PASS_H_
#include <string>
#include "base/logging.h"
namespace art {
// Forward declarations.
class BasicBlock;
class Pass;
// Empty Pass Data Class, can be extended by any pass extending the base Pass class.
class PassDataHolder {
};
/**
* @class Pass
* @brief Base Pass class, can be extended to perform a more defined way of doing the work call.
*/
class Pass {
public:
explicit Pass(const char* name)
: pass_name_(name) {
}
virtual ~Pass() {
}
virtual const char* GetName() const {
return pass_name_;
}
/**
* @brief Gate for the pass: determines whether to execute the pass or not considering a CompilationUnit
* @param data the PassDataHolder.
* @return whether or not to execute the pass.
*/
virtual bool Gate(const PassDataHolder* data) const {
// Unused parameter.
UNUSED(data);
// Base class says yes.
return true;
}
/**
* @brief Start of the pass: called before the Worker function.
*/
virtual void Start(PassDataHolder* data) const {
// Unused parameter.
UNUSED(data);
}
/**
* @brief End of the pass: called after the WalkBasicBlocks function.
*/
virtual void End(PassDataHolder* data) const {
// Unused parameter.
UNUSED(data);
}
/**
* @param data the object containing data necessary for the pass.
* @return whether or not there is a change when walking the BasicBlock
*/
virtual bool Worker(PassDataHolder* data ATTRIBUTE_UNUSED) const {
// Passes that do all their work in Start() or End() should not allow useless node iteration.
LOG(FATAL) << "Unsupported default Worker() used for " << GetName();
UNREACHABLE();
}
protected:
/** @brief The pass name: used for searching for a pass when running a particular pass or debugging. */
const char* const pass_name_;
private:
// In order to make the all passes not copy-friendly.
DISALLOW_COPY_AND_ASSIGN(Pass);
};
} // namespace art
#endif // ART_COMPILER_DEX_PASS_H_
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