590 lines
18 KiB
C++
590 lines
18 KiB
C++
//===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
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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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// Optimizations may be specified an arbitrary number of times on the command
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// line, They are run in the order specified.
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//
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//===----------------------------------------------------------------------===//
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#include "BreakpointPrinter.h"
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#include "NewPMDriver.h"
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#include "PassPrinters.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Analysis/CallGraphSCCPass.h"
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#include "llvm/Analysis/LoopPass.h"
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#include "llvm/Analysis/RegionPass.h"
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#include "llvm/Bitcode/BitcodeWriterPass.h"
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#include "llvm/CodeGen/CommandFlags.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/IRPrintingPasses.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/LegacyPassNameParser.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/IRReader/IRReader.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/LinkAllIR.h"
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#include "llvm/LinkAllPasses.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/PassManager.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PluginLoader.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/SystemUtils.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Target/TargetLibraryInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Transforms/IPO/PassManagerBuilder.h"
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#include <algorithm>
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#include <memory>
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using namespace llvm;
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using namespace opt_tool;
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// The OptimizationList is automatically populated with registered Passes by the
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// PassNameParser.
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//
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static cl::list<const PassInfo*, bool, PassNameParser>
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PassList(cl::desc("Optimizations available:"));
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// This flag specifies a textual description of the optimization pass pipeline
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// to run over the module. This flag switches opt to use the new pass manager
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// infrastructure, completely disabling all of the flags specific to the old
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// pass management.
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static cl::opt<std::string> PassPipeline(
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"passes",
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cl::desc("A textual description of the pass pipeline for optimizing"),
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cl::Hidden);
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// Other command line options...
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//
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
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cl::init("-"), cl::value_desc("filename"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Override output filename"),
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cl::value_desc("filename"));
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static cl::opt<bool>
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Force("f", cl::desc("Enable binary output on terminals"));
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static cl::opt<bool>
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PrintEachXForm("p", cl::desc("Print module after each transformation"));
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static cl::opt<bool>
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NoOutput("disable-output",
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cl::desc("Do not write result bitcode file"), cl::Hidden);
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static cl::opt<bool>
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OutputAssembly("S", cl::desc("Write output as LLVM assembly"));
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static cl::opt<bool>
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NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
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static cl::opt<bool>
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VerifyEach("verify-each", cl::desc("Verify after each transform"));
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static cl::opt<bool>
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StripDebug("strip-debug",
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cl::desc("Strip debugger symbol info from translation unit"));
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static cl::opt<bool>
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DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
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static cl::opt<bool>
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DisableOptimizations("disable-opt",
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cl::desc("Do not run any optimization passes"));
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static cl::opt<bool>
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StandardLinkOpts("std-link-opts",
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cl::desc("Include the standard link time optimizations"));
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static cl::opt<bool>
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OptLevelO1("O1",
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cl::desc("Optimization level 1. Similar to clang -O1"));
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static cl::opt<bool>
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OptLevelO2("O2",
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cl::desc("Optimization level 2. Similar to clang -O2"));
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static cl::opt<bool>
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OptLevelOs("Os",
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cl::desc("Like -O2 with extra optimizations for size. Similar to clang -Os"));
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static cl::opt<bool>
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OptLevelOz("Oz",
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cl::desc("Like -Os but reduces code size further. Similar to clang -Oz"));
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static cl::opt<bool>
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OptLevelO3("O3",
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cl::desc("Optimization level 3. Similar to clang -O3"));
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static cl::opt<std::string>
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TargetTriple("mtriple", cl::desc("Override target triple for module"));
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static cl::opt<bool>
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UnitAtATime("funit-at-a-time",
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cl::desc("Enable IPO. This corresponds to gcc's -funit-at-a-time"),
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cl::init(true));
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static cl::opt<bool>
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DisableLoopUnrolling("disable-loop-unrolling",
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cl::desc("Disable loop unrolling in all relevant passes"),
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cl::init(false));
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static cl::opt<bool>
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DisableLoopVectorization("disable-loop-vectorization",
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cl::desc("Disable the loop vectorization pass"),
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cl::init(false));
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static cl::opt<bool>
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DisableSLPVectorization("disable-slp-vectorization",
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cl::desc("Disable the slp vectorization pass"),
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cl::init(false));
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static cl::opt<bool>
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DisableSimplifyLibCalls("disable-simplify-libcalls",
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cl::desc("Disable simplify-libcalls"));
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static cl::opt<bool>
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Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
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static cl::alias
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QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
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static cl::opt<bool>
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AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
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static cl::opt<bool>
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PrintBreakpoints("print-breakpoints-for-testing",
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cl::desc("Print select breakpoints location for testing"));
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static cl::opt<std::string>
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DefaultDataLayout("default-data-layout",
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cl::desc("data layout string to use if not specified by module"),
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cl::value_desc("layout-string"), cl::init(""));
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static inline void addPass(PassManagerBase &PM, Pass *P) {
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// Add the pass to the pass manager...
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PM.add(P);
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// If we are verifying all of the intermediate steps, add the verifier...
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if (VerifyEach) {
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PM.add(createVerifierPass());
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PM.add(createDebugInfoVerifierPass());
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}
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}
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/// This routine adds optimization passes based on selected optimization level,
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/// OptLevel.
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///
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/// OptLevel - Optimization Level
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static void AddOptimizationPasses(PassManagerBase &MPM,FunctionPassManager &FPM,
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unsigned OptLevel, unsigned SizeLevel) {
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FPM.add(createVerifierPass()); // Verify that input is correct
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MPM.add(createDebugInfoVerifierPass()); // Verify that debug info is correct
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PassManagerBuilder Builder;
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Builder.OptLevel = OptLevel;
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Builder.SizeLevel = SizeLevel;
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if (DisableInline) {
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// No inlining pass
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} else if (OptLevel > 1) {
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Builder.Inliner = createFunctionInliningPass(OptLevel, SizeLevel);
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} else {
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Builder.Inliner = createAlwaysInlinerPass();
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}
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Builder.DisableUnitAtATime = !UnitAtATime;
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Builder.DisableUnrollLoops = (DisableLoopUnrolling.getNumOccurrences() > 0) ?
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DisableLoopUnrolling : OptLevel == 0;
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// This is final, unless there is a #pragma vectorize enable
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if (DisableLoopVectorization)
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Builder.LoopVectorize = false;
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// If option wasn't forced via cmd line (-vectorize-loops, -loop-vectorize)
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else if (!Builder.LoopVectorize)
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Builder.LoopVectorize = OptLevel > 1 && SizeLevel < 2;
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// When #pragma vectorize is on for SLP, do the same as above
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Builder.SLPVectorize =
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DisableSLPVectorization ? false : OptLevel > 1 && SizeLevel < 2;
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Builder.populateFunctionPassManager(FPM);
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Builder.populateModulePassManager(MPM);
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}
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static void AddStandardLinkPasses(PassManagerBase &PM) {
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PassManagerBuilder Builder;
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Builder.VerifyInput = true;
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Builder.StripDebug = StripDebug;
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if (DisableOptimizations)
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Builder.OptLevel = 0;
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if (!DisableInline)
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Builder.Inliner = createFunctionInliningPass();
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Builder.populateLTOPassManager(PM);
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}
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//===----------------------------------------------------------------------===//
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// CodeGen-related helper functions.
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//
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CodeGenOpt::Level GetCodeGenOptLevel() {
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if (OptLevelO1)
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return CodeGenOpt::Less;
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if (OptLevelO2)
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return CodeGenOpt::Default;
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if (OptLevelO3)
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return CodeGenOpt::Aggressive;
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return CodeGenOpt::None;
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}
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// Returns the TargetMachine instance or zero if no triple is provided.
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static TargetMachine* GetTargetMachine(Triple TheTriple) {
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std::string Error;
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const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple,
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Error);
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// Some modules don't specify a triple, and this is okay.
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if (!TheTarget) {
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return nullptr;
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}
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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if (MAttrs.size()) {
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SubtargetFeatures Features;
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for (unsigned i = 0; i != MAttrs.size(); ++i)
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Features.AddFeature(MAttrs[i]);
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FeaturesStr = Features.getString();
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}
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return TheTarget->createTargetMachine(TheTriple.getTriple(),
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MCPU, FeaturesStr,
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InitTargetOptionsFromCodeGenFlags(),
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RelocModel, CMModel,
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GetCodeGenOptLevel());
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}
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#ifdef LINK_POLLY_INTO_TOOLS
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namespace polly {
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void initializePollyPasses(llvm::PassRegistry &Registry);
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}
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#endif
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//===----------------------------------------------------------------------===//
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// main for opt
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//
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int main(int argc, char **argv) {
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sys::PrintStackTraceOnErrorSignal();
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llvm::PrettyStackTraceProgram X(argc, argv);
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// Enable debug stream buffering.
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EnableDebugBuffering = true;
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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LLVMContext &Context = getGlobalContext();
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmPrinters();
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// Initialize passes
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PassRegistry &Registry = *PassRegistry::getPassRegistry();
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initializeCore(Registry);
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initializeScalarOpts(Registry);
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initializeObjCARCOpts(Registry);
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initializeVectorization(Registry);
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initializeIPO(Registry);
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initializeAnalysis(Registry);
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initializeIPA(Registry);
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initializeTransformUtils(Registry);
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initializeInstCombine(Registry);
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initializeInstrumentation(Registry);
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initializeTarget(Registry);
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// For codegen passes, only passes that do IR to IR transformation are
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// supported.
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initializeCodeGenPreparePass(Registry);
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initializeAtomicExpandPass(Registry);
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initializeRewriteSymbolsPass(Registry);
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#ifdef LINK_POLLY_INTO_TOOLS
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polly::initializePollyPasses(Registry);
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#endif
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cl::ParseCommandLineOptions(argc, argv,
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"llvm .bc -> .bc modular optimizer and analysis printer\n");
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if (AnalyzeOnly && NoOutput) {
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errs() << argv[0] << ": analyze mode conflicts with no-output mode.\n";
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return 1;
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}
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SMDiagnostic Err;
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// Load the input module...
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std::unique_ptr<Module> M = parseIRFile(InputFilename, Err, Context);
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if (!M) {
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Err.print(argv[0], errs());
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return 1;
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}
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// If we are supposed to override the target triple, do so now.
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if (!TargetTriple.empty())
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M->setTargetTriple(Triple::normalize(TargetTriple));
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// Figure out what stream we are supposed to write to...
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std::unique_ptr<tool_output_file> Out;
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if (NoOutput) {
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if (!OutputFilename.empty())
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errs() << "WARNING: The -o (output filename) option is ignored when\n"
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"the --disable-output option is used.\n";
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} else {
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// Default to standard output.
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if (OutputFilename.empty())
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OutputFilename = "-";
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std::error_code EC;
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Out.reset(new tool_output_file(OutputFilename, EC, sys::fs::F_None));
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if (EC) {
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errs() << EC.message() << '\n';
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return 1;
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}
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}
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// If the output is set to be emitted to standard out, and standard out is a
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// console, print out a warning message and refuse to do it. We don't
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// impress anyone by spewing tons of binary goo to a terminal.
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if (!Force && !NoOutput && !AnalyzeOnly && !OutputAssembly)
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if (CheckBitcodeOutputToConsole(Out->os(), !Quiet))
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NoOutput = true;
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if (PassPipeline.getNumOccurrences() > 0) {
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OutputKind OK = OK_NoOutput;
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if (!NoOutput)
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OK = OutputAssembly ? OK_OutputAssembly : OK_OutputBitcode;
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VerifierKind VK = VK_VerifyInAndOut;
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if (NoVerify)
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VK = VK_NoVerifier;
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else if (VerifyEach)
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VK = VK_VerifyEachPass;
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// The user has asked to use the new pass manager and provided a pipeline
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// string. Hand off the rest of the functionality to the new code for that
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// layer.
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return runPassPipeline(argv[0], Context, *M, Out.get(), PassPipeline,
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OK, VK)
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? 0
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: 1;
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}
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// Create a PassManager to hold and optimize the collection of passes we are
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// about to build.
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//
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PassManager Passes;
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// Add an appropriate TargetLibraryInfo pass for the module's triple.
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TargetLibraryInfo *TLI = new TargetLibraryInfo(Triple(M->getTargetTriple()));
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// The -disable-simplify-libcalls flag actually disables all builtin optzns.
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if (DisableSimplifyLibCalls)
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TLI->disableAllFunctions();
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Passes.add(TLI);
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// Add an appropriate DataLayout instance for this module.
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const DataLayout *DL = M->getDataLayout();
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if (!DL && !DefaultDataLayout.empty()) {
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M->setDataLayout(DefaultDataLayout);
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DL = M->getDataLayout();
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}
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if (DL)
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Passes.add(new DataLayoutPass());
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Triple ModuleTriple(M->getTargetTriple());
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TargetMachine *Machine = nullptr;
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if (ModuleTriple.getArch())
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Machine = GetTargetMachine(Triple(ModuleTriple));
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std::unique_ptr<TargetMachine> TM(Machine);
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// Add internal analysis passes from the target machine.
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if (TM)
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TM->addAnalysisPasses(Passes);
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std::unique_ptr<FunctionPassManager> FPasses;
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if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
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FPasses.reset(new FunctionPassManager(M.get()));
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if (DL)
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FPasses->add(new DataLayoutPass());
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if (TM)
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TM->addAnalysisPasses(*FPasses);
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}
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if (PrintBreakpoints) {
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// Default to standard output.
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if (!Out) {
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if (OutputFilename.empty())
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OutputFilename = "-";
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std::error_code EC;
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Out = llvm::make_unique<tool_output_file>(OutputFilename, EC,
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sys::fs::F_None);
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if (EC) {
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errs() << EC.message() << '\n';
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return 1;
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}
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}
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Passes.add(createBreakpointPrinter(Out->os()));
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NoOutput = true;
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}
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// If the -strip-debug command line option was specified, add it.
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if (StripDebug)
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addPass(Passes, createStripSymbolsPass(true));
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// Create a new optimization pass for each one specified on the command line
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for (unsigned i = 0; i < PassList.size(); ++i) {
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if (StandardLinkOpts &&
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StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
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AddStandardLinkPasses(Passes);
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StandardLinkOpts = false;
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}
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if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
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AddOptimizationPasses(Passes, *FPasses, 1, 0);
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OptLevelO1 = false;
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}
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if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
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AddOptimizationPasses(Passes, *FPasses, 2, 0);
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OptLevelO2 = false;
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}
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if (OptLevelOs && OptLevelOs.getPosition() < PassList.getPosition(i)) {
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AddOptimizationPasses(Passes, *FPasses, 2, 1);
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OptLevelOs = false;
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}
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if (OptLevelOz && OptLevelOz.getPosition() < PassList.getPosition(i)) {
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AddOptimizationPasses(Passes, *FPasses, 2, 2);
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OptLevelOz = false;
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}
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if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
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AddOptimizationPasses(Passes, *FPasses, 3, 0);
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OptLevelO3 = false;
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}
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const PassInfo *PassInf = PassList[i];
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Pass *P = nullptr;
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if (PassInf->getTargetMachineCtor())
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P = PassInf->getTargetMachineCtor()(TM.get());
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else if (PassInf->getNormalCtor())
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P = PassInf->getNormalCtor()();
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else
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errs() << argv[0] << ": cannot create pass: "
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<< PassInf->getPassName() << "\n";
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if (P) {
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PassKind Kind = P->getPassKind();
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addPass(Passes, P);
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if (AnalyzeOnly) {
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switch (Kind) {
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case PT_BasicBlock:
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Passes.add(createBasicBlockPassPrinter(PassInf, Out->os(), Quiet));
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break;
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case PT_Region:
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Passes.add(createRegionPassPrinter(PassInf, Out->os(), Quiet));
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break;
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case PT_Loop:
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Passes.add(createLoopPassPrinter(PassInf, Out->os(), Quiet));
|
|
break;
|
|
case PT_Function:
|
|
Passes.add(createFunctionPassPrinter(PassInf, Out->os(), Quiet));
|
|
break;
|
|
case PT_CallGraphSCC:
|
|
Passes.add(createCallGraphPassPrinter(PassInf, Out->os(), Quiet));
|
|
break;
|
|
default:
|
|
Passes.add(createModulePassPrinter(PassInf, Out->os(), Quiet));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (PrintEachXForm)
|
|
Passes.add(createPrintModulePass(errs()));
|
|
}
|
|
|
|
if (StandardLinkOpts) {
|
|
AddStandardLinkPasses(Passes);
|
|
StandardLinkOpts = false;
|
|
}
|
|
|
|
if (OptLevelO1)
|
|
AddOptimizationPasses(Passes, *FPasses, 1, 0);
|
|
|
|
if (OptLevelO2)
|
|
AddOptimizationPasses(Passes, *FPasses, 2, 0);
|
|
|
|
if (OptLevelOs)
|
|
AddOptimizationPasses(Passes, *FPasses, 2, 1);
|
|
|
|
if (OptLevelOz)
|
|
AddOptimizationPasses(Passes, *FPasses, 2, 2);
|
|
|
|
if (OptLevelO3)
|
|
AddOptimizationPasses(Passes, *FPasses, 3, 0);
|
|
|
|
if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
|
|
FPasses->doInitialization();
|
|
for (Function &F : *M)
|
|
FPasses->run(F);
|
|
FPasses->doFinalization();
|
|
}
|
|
|
|
// Check that the module is well formed on completion of optimization
|
|
if (!NoVerify && !VerifyEach) {
|
|
Passes.add(createVerifierPass());
|
|
Passes.add(createDebugInfoVerifierPass());
|
|
}
|
|
|
|
// Write bitcode or assembly to the output as the last step...
|
|
if (!NoOutput && !AnalyzeOnly) {
|
|
if (OutputAssembly)
|
|
Passes.add(createPrintModulePass(Out->os()));
|
|
else
|
|
Passes.add(createBitcodeWriterPass(Out->os()));
|
|
}
|
|
|
|
// Before executing passes, print the final values of the LLVM options.
|
|
cl::PrintOptionValues();
|
|
|
|
// Now that we have all of the passes ready, run them.
|
|
Passes.run(*M);
|
|
|
|
// Declare success.
|
|
if (!NoOutput || PrintBreakpoints)
|
|
Out->keep();
|
|
|
|
return 0;
|
|
}
|