SPIRV-Tools/source/opt/pass_manager.h
2016-09-22 18:15:23 -04:00

102 lines
3.3 KiB
C++

// Copyright (c) 2016 Google Inc.
//
// 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 LIBSPIRV_OPT_PASS_MANAGER_H_
#define LIBSPIRV_OPT_PASS_MANAGER_H_
#include <memory>
#include <vector>
#include "log.h"
#include "module.h"
#include "pass.h"
#include "spirv-tools/libspirv.hpp"
namespace spvtools {
namespace opt {
// The pass manager, responsible for tracking and running passes.
// Clients should first call AddPass() to add passes and then call Run()
// to run on a module. Passes are executed in the exact order of addition.
class PassManager {
public:
// Constructs a pass manager.
//
// The constructed instance will have an empty message consumer, which just
// ignores all messages from the library. Use SetMessageConsumer() to supply
// one if messages are of concern.
PassManager() : consumer_(nullptr) {}
// Sets the message consumer to the given |consumer|.
void SetMessageConsumer(MessageConsumer c) { consumer_ = std::move(c); }
// Adds an externally constructed pass.
void AddPass(std::unique_ptr<Pass> pass);
// Uses the argument |args| to construct a pass instance of type |T|, and adds
// the pass instance to this pass manger. The pass added will use this pass
// manager's message consumer.
template <typename T, typename... Args>
void AddPass(Args&&... args);
// Returns the number of passes added.
uint32_t NumPasses() const;
// Returns a pointer to the |index|th pass added.
inline Pass* GetPass(uint32_t index) const;
// Returns the message consumer.
inline const MessageConsumer& consumer() const;
// Runs all passes on the given |module|. Returns Status::Failure if errors
// occur when processing using one of the registered passes. All passes
// registered after the error-reporting pass will be skipped. Returns the
// corresponding Status::Success if processing is succesful to indicate
// whether changes are made to the module.
Pass::Status Run(ir::Module* module);
private:
// Consumer for messages.
MessageConsumer consumer_;
// A vector of passes. Order matters.
std::vector<std::unique_ptr<Pass>> passes_;
};
inline void PassManager::AddPass(std::unique_ptr<Pass> pass) {
passes_.push_back(std::move(pass));
}
template <typename T, typename... Args>
inline void PassManager::AddPass(Args&&... args) {
passes_.emplace_back(new T(std::forward<Args>(args)...));
passes_.back()->SetMessageConsumer(consumer_);
}
inline uint32_t PassManager::NumPasses() const {
return static_cast<uint32_t>(passes_.size());
}
inline Pass* PassManager::GetPass(uint32_t index) const {
SPIRV_ASSERT(consumer_, index < passes_.size(), "index out of bound");
return passes_[index].get();
}
inline const MessageConsumer& PassManager::consumer() const {
return consumer_;
}
} // namespace opt
} // namespace spvtools
#endif // LIBSPIRV_OPT_PASS_MANAGER_H_