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127 lines
4.0 KiB
C++
127 lines
4.0 KiB
C++
//===- RegionPass.h - RegionPass class --------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the RegionPass class. All region based analysis,
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// optimization and transformation passes are derived from RegionPass.
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// This class is implemented following the some ideas of the LoopPass.h class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_REGIONPASS_H
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#define LLVM_ANALYSIS_REGIONPASS_H
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#include "llvm/Analysis/RegionInfo.h"
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#include "llvm/IR/LegacyPassManagers.h"
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#include "llvm/Pass.h"
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#include <deque>
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namespace llvm {
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class Function;
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class RGPassManager;
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//===----------------------------------------------------------------------===//
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/// A pass that runs on each Region in a function.
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///
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/// RegionPass is managed by RGPassManager.
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class RegionPass : public Pass {
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public:
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explicit RegionPass(char &pid) : Pass(PT_Region, pid) {}
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//===--------------------------------------------------------------------===//
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/// @name To be implemented by every RegionPass
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///
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//@{
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/// Run the pass on a specific Region
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///
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/// Accessing regions not contained in the current region is not allowed.
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///
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/// @param R The region this pass is run on.
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/// @param RGM The RegionPassManager that manages this Pass.
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///
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/// @return True if the pass modifies this Region.
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virtual bool runOnRegion(Region *R, RGPassManager &RGM) = 0;
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/// Get a pass to print the LLVM IR in the region.
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///
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/// @param O The output stream to print the Region.
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/// @param Banner The banner to separate different printed passes.
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///
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/// @return The pass to print the LLVM IR in the region.
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Pass *createPrinterPass(raw_ostream &O,
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const std::string &Banner) const override;
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using llvm::Pass::doInitialization;
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using llvm::Pass::doFinalization;
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virtual bool doInitialization(Region *R, RGPassManager &RGM) { return false; }
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virtual bool doFinalization() { return false; }
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//@}
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//===--------------------------------------------------------------------===//
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/// @name PassManager API
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///
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//@{
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void preparePassManager(PMStack &PMS) override;
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void assignPassManager(PMStack &PMS,
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PassManagerType PMT = PMT_RegionPassManager) override;
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PassManagerType getPotentialPassManagerType() const override {
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return PMT_RegionPassManager;
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}
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//@}
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protected:
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/// Optional passes call this function to check whether the pass should be
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/// skipped. This is the case when optimization bisect is over the limit.
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bool skipRegion(Region &R) const;
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};
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/// The pass manager to schedule RegionPasses.
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class RGPassManager : public FunctionPass, public PMDataManager {
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std::deque<Region*> RQ;
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RegionInfo *RI;
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Region *CurrentRegion;
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public:
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static char ID;
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explicit RGPassManager();
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/// Execute all of the passes scheduled for execution.
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///
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/// @return True if any of the passes modifies the function.
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bool runOnFunction(Function &F) override;
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/// Pass Manager itself does not invalidate any analysis info.
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/// RGPassManager needs RegionInfo.
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void getAnalysisUsage(AnalysisUsage &Info) const override;
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StringRef getPassName() const override { return "Region Pass Manager"; }
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PMDataManager *getAsPMDataManager() override { return this; }
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Pass *getAsPass() override { return this; }
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/// Print passes managed by this manager.
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void dumpPassStructure(unsigned Offset) override;
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/// Get passes contained by this manager.
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Pass *getContainedPass(unsigned N) {
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assert(N < PassVector.size() && "Pass number out of range!");
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Pass *FP = static_cast<Pass *>(PassVector[N]);
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return FP;
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}
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PassManagerType getPassManagerType() const override {
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return PMT_RegionPassManager;
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}
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};
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} // End llvm namespace
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#endif
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