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f5be7bdc90
the pass manager. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131814 91177308-0d34-0410-b5e6-96231b3b80d8
248 lines
9.4 KiB
C++
248 lines
9.4 KiB
C++
//===-- llvm/Support/PasaMangerBuilder.h - Build Standard Pass --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the PassManagerBuilder class, which is used to set up a
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// "standard" optimization sequence suitable for languages like C and C++.
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//
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// These are implemented as inline functions so that we do not have to worry
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// about link issues.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_PASSMANAGERBUILDER_H
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#define LLVM_SUPPORT_PASSMANAGERBUILDER_H
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#include "llvm/PassManager.h"
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#include "llvm/DefaultPasses.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Target/TargetLibraryInfo.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/IPO.h"
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namespace llvm {
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/// PassManagerBuilder - This class is used to set up a standard optimization
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/// sequence for languages like C and C++, allowing some APIs to customize the
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/// pass sequence in various ways. A simple example of using it would be:
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///
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/// OptimizerBuilder Builder;
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/// Builder.setOptimizationLevel(2);
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/// Builder.populateFunctionPassManager(FPM);
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/// Builder.populateModulePassManager(MPM);
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///
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/// In addition to setting up the basic passes, PassManagerBuilder allows
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/// frontends to vend a plugin API, where plugins are allowed to add extensions
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/// to the default pass manager. They do this by specifying where in the pass
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/// pipeline they want to be added, along with a callback function that adds
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/// the pass(es). For example, a plugin that wanted to add a loop optimization
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/// could do something like this:
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///
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/// static void addMyLoopPass(const PMBuilder &Builder, PassManagerBase &PM) {
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/// if (Builder.getOptLevel() > 2 && Builder.getOptSizeLevel() == 0)
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/// PM.add(createMyAwesomePass());
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/// }
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/// ...
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/// Builder.addExtension(PassManagerBuilder::EP_LoopOptimizerEnd,
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/// addMyLoopPass);
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/// ...
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class PassManagerBuilder {
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public:
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/// Extensions are passed the builder itself (so they can see how it is
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/// configured) as well as the pass manager to add stuff to.
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typedef void (*ExtensionFn)(const PassManagerBuilder &Builder,
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PassManagerBase &PM);
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enum ExtensionPointTy {
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/// EP_EarlyAsPossible - This extension point allows adding passes before
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/// any other transformations, allowing them to see the code as it is coming
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/// out of the frontend.
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EP_EarlyAsPossible,
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/// EP_LoopOptimizerEnd - This extension point allows adding loop passes to
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/// the end of the loop optimizer.
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EP_LoopOptimizerEnd
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};
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/// The Optimization Level - Specify the basic optimization level.
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/// 0 = -O0, 1 = -O1, 2 = -O2, 3 = -O3
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unsigned OptLevel;
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/// SizeLevel - How much we're optimizing for size.
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/// 0 = none, 1 = -Os, 2 = -Oz
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unsigned SizeLevel;
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/// LibraryInfo - Specifies information about the runtime library for the
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/// optimizer. If this is non-null, it is added to both the function and
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/// per-module pass pipeline.
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TargetLibraryInfo *LibraryInfo;
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/// Inliner - Specifies the inliner to use. If this is non-null, it is
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/// added to the per-module passes.
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Pass *Inliner;
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bool DisableSimplifyLibCalls;
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bool DisableUnitAtATime;
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bool DisableUnrollLoops;
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private:
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/// ExtensionList - This is list of all of the extensions that are registered.
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std::vector<std::pair<ExtensionPointTy, ExtensionFn> > Extensions;
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public:
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PassManagerBuilder() {
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OptLevel = 2;
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SizeLevel = 0;
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LibraryInfo = 0;
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Inliner = 0;
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DisableSimplifyLibCalls = false;
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DisableUnitAtATime = false;
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DisableUnrollLoops = false;
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}
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~PassManagerBuilder() {
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delete LibraryInfo;
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delete Inliner;
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}
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void addExtension(ExtensionPointTy Ty, ExtensionFn Fn) {
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Extensions.push_back(std::make_pair(Ty, Fn));
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}
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private:
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void addExtensionsToPM(ExtensionPointTy ETy, PassManagerBase &PM) const {
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for (unsigned i = 0, e = Extensions.size(); i != e; ++i)
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if (Extensions[i].first == ETy)
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Extensions[i].second(*this, PM);
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}
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void addInitialAliasAnalysisPasses(PassManagerBase &PM) const {
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// Add TypeBasedAliasAnalysis before BasicAliasAnalysis so that
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// BasicAliasAnalysis wins if they disagree. This is intended to help
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// support "obvious" type-punning idioms.
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PM.add(createTypeBasedAliasAnalysisPass());
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PM.add(createBasicAliasAnalysisPass());
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}
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public:
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/// populateFunctionPassManager - This fills in the function pass manager,
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/// which is expected to be run on each function immediately as it is
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/// generated. The idea is to reduce the size of the IR in memory.
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void populateFunctionPassManager(FunctionPassManager &FPM) {
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addExtensionsToPM(EP_EarlyAsPossible, FPM);
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// Add LibraryInfo if we have some.
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if (LibraryInfo) FPM.add(new TargetLibraryInfo(*LibraryInfo));
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if (OptLevel == 0) return;
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addInitialAliasAnalysisPasses(FPM);
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FPM.add(createCFGSimplificationPass());
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FPM.add(createScalarReplAggregatesPass());
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FPM.add(createEarlyCSEPass());
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}
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/// populateModulePassManager - This sets up the primary pass manager.
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void populateModulePassManager(PassManagerBase &MPM) {
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// If all optimizations are disabled, just run the always-inline pass.
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if (OptLevel == 0) {
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if (Inliner) {
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MPM.add(Inliner);
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Inliner = 0;
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}
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return;
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}
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// Add LibraryInfo if we have some.
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if (LibraryInfo) MPM.add(new TargetLibraryInfo(*LibraryInfo));
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addInitialAliasAnalysisPasses(MPM);
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if (!DisableUnitAtATime) {
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MPM.add(createGlobalOptimizerPass()); // Optimize out global vars
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MPM.add(createIPSCCPPass()); // IP SCCP
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MPM.add(createDeadArgEliminationPass()); // Dead argument elimination
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MPM.add(createInstructionCombiningPass());// Clean up after IPCP & DAE
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MPM.add(createCFGSimplificationPass()); // Clean up after IPCP & DAE
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}
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// Start of CallGraph SCC passes.
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if (!DisableUnitAtATime)
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MPM.add(createPruneEHPass()); // Remove dead EH info
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if (Inliner) {
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MPM.add(Inliner);
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Inliner = 0;
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}
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if (!DisableUnitAtATime)
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MPM.add(createFunctionAttrsPass()); // Set readonly/readnone attrs
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if (OptLevel > 2)
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MPM.add(createArgumentPromotionPass()); // Scalarize uninlined fn args
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// Start of function pass.
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// Break up aggregate allocas, using SSAUpdater.
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MPM.add(createScalarReplAggregatesPass(-1, false));
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MPM.add(createEarlyCSEPass()); // Catch trivial redundancies
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if (!DisableSimplifyLibCalls)
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MPM.add(createSimplifyLibCallsPass()); // Library Call Optimizations
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MPM.add(createJumpThreadingPass()); // Thread jumps.
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MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
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MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
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MPM.add(createInstructionCombiningPass()); // Combine silly seq's
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MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
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MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
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MPM.add(createReassociatePass()); // Reassociate expressions
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MPM.add(createLoopRotatePass()); // Rotate Loop
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MPM.add(createLICMPass()); // Hoist loop invariants
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MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
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MPM.add(createInstructionCombiningPass());
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MPM.add(createIndVarSimplifyPass()); // Canonicalize indvars
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MPM.add(createLoopIdiomPass()); // Recognize idioms like memset.
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MPM.add(createLoopDeletionPass()); // Delete dead loops
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if (!DisableUnrollLoops)
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MPM.add(createLoopUnrollPass()); // Unroll small loops
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addExtensionsToPM(EP_LoopOptimizerEnd, MPM);
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if (OptLevel > 1)
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MPM.add(createGVNPass()); // Remove redundancies
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MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
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MPM.add(createSCCPPass()); // Constant prop with SCCP
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// Run instcombine after redundancy elimination to exploit opportunities
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// opened up by them.
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MPM.add(createInstructionCombiningPass());
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MPM.add(createJumpThreadingPass()); // Thread jumps
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MPM.add(createCorrelatedValuePropagationPass());
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MPM.add(createDeadStoreEliminationPass()); // Delete dead stores
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MPM.add(createAggressiveDCEPass()); // Delete dead instructions
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MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
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MPM.add(createInstructionCombiningPass()); // Clean up after everything.
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if (!DisableUnitAtATime) {
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MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
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MPM.add(createDeadTypeEliminationPass()); // Eliminate dead types
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// GlobalOpt already deletes dead functions and globals, at -O3 try a
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// late pass of GlobalDCE. It is capable of deleting dead cycles.
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if (OptLevel > 2)
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MPM.add(createGlobalDCEPass()); // Remove dead fns and globals.
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if (OptLevel > 1)
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MPM.add(createConstantMergePass()); // Merge dup global constants
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}
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}
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};
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} // end namespace llvm
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#endif
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