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a1bdcedc38
an existing file is considered an error. Convert several tools to use raw_fd_ostream instead of std::ostream, and to use this new option instead of doing a manual check. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75801 91177308-0d34-0410-b5e6-96231b3b80d8
493 lines
16 KiB
C++
493 lines
16 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 "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/PassManager.h"
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#include "llvm/CallGraphSCCPass.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/Assembly/PrintModulePass.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Analysis/LoopPass.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/PassNameParser.h"
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#include "llvm/System/Signals.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PluginLoader.h"
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#include "llvm/Support/StandardPasses.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/Support/SystemUtils.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/LinkAllPasses.h"
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#include "llvm/LinkAllVMCore.h"
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#include <memory>
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#include <algorithm>
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using namespace llvm;
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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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// 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"), cl::init("-"));
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static cl::opt<bool>
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Force("f", cl::desc("Overwrite output files"));
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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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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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StandardCompileOpts("std-compile-opts",
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cl::desc("Include the standard compile 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 llvm-gcc -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 llvm-gcc -O2"));
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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 llvm-gcc -O3"));
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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 is same as llvm-gcc's -funit-at-a-time"));
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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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// ---------- Define Printers for module and function passes ------------
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namespace {
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struct CallGraphSCCPassPrinter : public CallGraphSCCPass {
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static char ID;
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const PassInfo *PassToPrint;
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CallGraphSCCPassPrinter(const PassInfo *PI) :
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CallGraphSCCPass(&ID), PassToPrint(PI) {}
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virtual bool runOnSCC(const std::vector<CallGraphNode *>&SCC) {
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if (!Quiet) {
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cout << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
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for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
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Function *F = SCC[i]->getFunction();
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if (F)
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getAnalysisID<Pass>(PassToPrint).print(cout, F->getParent());
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}
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}
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// Get and print pass...
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return false;
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}
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virtual const char *getPassName() const { return "'Pass' Printer"; }
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredID(PassToPrint);
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AU.setPreservesAll();
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}
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};
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char CallGraphSCCPassPrinter::ID = 0;
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struct ModulePassPrinter : public ModulePass {
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static char ID;
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const PassInfo *PassToPrint;
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ModulePassPrinter(const PassInfo *PI) : ModulePass(&ID),
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PassToPrint(PI) {}
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virtual bool runOnModule(Module &M) {
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if (!Quiet) {
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cout << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
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getAnalysisID<Pass>(PassToPrint).print(cout, &M);
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}
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// Get and print pass...
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return false;
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}
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virtual const char *getPassName() const { return "'Pass' Printer"; }
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredID(PassToPrint);
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AU.setPreservesAll();
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}
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};
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char ModulePassPrinter::ID = 0;
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struct FunctionPassPrinter : public FunctionPass {
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const PassInfo *PassToPrint;
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static char ID;
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FunctionPassPrinter(const PassInfo *PI) : FunctionPass(&ID),
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PassToPrint(PI) {}
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virtual bool runOnFunction(Function &F) {
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if (!Quiet) {
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cout << "Printing analysis '" << PassToPrint->getPassName()
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<< "' for function '" << F.getName() << "':\n";
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}
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// Get and print pass...
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getAnalysisID<Pass>(PassToPrint).print(cout, F.getParent());
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return false;
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}
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virtual const char *getPassName() const { return "FunctionPass Printer"; }
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredID(PassToPrint);
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AU.setPreservesAll();
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}
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};
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char FunctionPassPrinter::ID = 0;
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struct LoopPassPrinter : public LoopPass {
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static char ID;
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const PassInfo *PassToPrint;
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LoopPassPrinter(const PassInfo *PI) :
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LoopPass(&ID), PassToPrint(PI) {}
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virtual bool runOnLoop(Loop *L, LPPassManager &LPM) {
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if (!Quiet) {
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cout << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
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getAnalysisID<Pass>(PassToPrint).print(cout,
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L->getHeader()->getParent()->getParent());
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}
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// Get and print pass...
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return false;
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}
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virtual const char *getPassName() const { return "'Pass' Printer"; }
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredID(PassToPrint);
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AU.setPreservesAll();
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}
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};
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char LoopPassPrinter::ID = 0;
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struct BasicBlockPassPrinter : public BasicBlockPass {
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const PassInfo *PassToPrint;
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static char ID;
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BasicBlockPassPrinter(const PassInfo *PI)
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: BasicBlockPass(&ID), PassToPrint(PI) {}
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virtual bool runOnBasicBlock(BasicBlock &BB) {
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if (!Quiet) {
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cout << "Printing Analysis info for BasicBlock '" << BB.getName()
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<< "': Pass " << PassToPrint->getPassName() << ":\n";
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}
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// Get and print pass...
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getAnalysisID<Pass>(PassToPrint).print(cout, BB.getParent()->getParent());
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return false;
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}
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virtual const char *getPassName() const { return "BasicBlockPass Printer"; }
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredID(PassToPrint);
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AU.setPreservesAll();
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}
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};
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char BasicBlockPassPrinter::ID = 0;
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inline void addPass(PassManager &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) PM.add(createVerifierPass());
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}
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/// AddOptimizationPasses - This routine adds optimization passes
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/// based on selected optimization level, OptLevel. This routine
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/// duplicates llvm-gcc behaviour.
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///
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/// OptLevel - Optimization Level
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void AddOptimizationPasses(PassManager &MPM, FunctionPassManager &FPM,
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unsigned OptLevel) {
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createStandardFunctionPasses(&FPM, OptLevel);
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llvm::Pass *InliningPass = OptLevel > 1 ? createFunctionInliningPass() : 0;
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createStandardModulePasses(&MPM, OptLevel,
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/*OptimizeSize=*/ false,
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UnitAtATime,
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/*UnrollLoops=*/ OptLevel > 1,
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!DisableSimplifyLibCalls,
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/*HaveExceptions=*/ true,
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InliningPass);
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}
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void AddStandardCompilePasses(PassManager &PM) {
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PM.add(createVerifierPass()); // Verify that input is correct
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addPass(PM, createLowerSetJmpPass()); // Lower llvm.setjmp/.longjmp
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// If the -strip-debug command line option was specified, do it.
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if (StripDebug)
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addPass(PM, createStripSymbolsPass(true));
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if (DisableOptimizations) return;
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llvm::Pass *InliningPass = !DisableInline ? createFunctionInliningPass() : 0;
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// -std-compile-opts adds the same module passes as -O3.
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createStandardModulePasses(&PM, 3,
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/*OptimizeSize=*/ false,
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/*UnitAtATime=*/ true,
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/*UnrollLoops=*/ true,
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/*SimplifyLibCalls=*/ true,
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/*HaveExceptions=*/ true,
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InliningPass);
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}
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} // anonymous namespace
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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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llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
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LLVMContext Context;
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try {
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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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sys::PrintStackTraceOnErrorSignal();
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// Allocate a full target machine description only if necessary.
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// FIXME: The choice of target should be controllable on the command line.
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std::auto_ptr<TargetMachine> target;
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std::string ErrorMessage;
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// Load the input module...
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std::auto_ptr<Module> M;
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if (MemoryBuffer *Buffer
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= MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)) {
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M.reset(ParseBitcodeFile(Buffer, Context, &ErrorMessage));
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delete Buffer;
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}
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if (M.get() == 0) {
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cerr << argv[0] << ": ";
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if (ErrorMessage.size())
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cerr << ErrorMessage << "\n";
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else
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cerr << "bitcode didn't read correctly.\n";
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return 1;
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}
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// Figure out what stream we are supposed to write to...
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// FIXME: cout is not binary!
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raw_ostream *Out = &outs(); // Default to printing to stdout...
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if (OutputFilename != "-") {
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std::string ErrorInfo;
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Out = new raw_fd_ostream(OutputFilename.c_str(), /*Binary=*/true,
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Force, ErrorInfo);
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if (!ErrorInfo.empty()) {
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errs() << ErrorInfo << '\n';
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if (!Force)
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errs() << "Use -f command line argument to force output\n";
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delete Out;
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return 1;
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}
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// Make sure that the Output file gets unlinked from the disk if we get a
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// SIGINT
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sys::RemoveFileOnSignal(sys::Path(OutputFilename));
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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 && CheckBitcodeOutputToConsole(Out,!Quiet)) {
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NoOutput = true;
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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 TargetData instance for this module...
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Passes.add(new TargetData(M.get()));
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FunctionPassManager *FPasses = NULL;
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if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
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FPasses = new FunctionPassManager(new ExistingModuleProvider(M.get()));
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FPasses->add(new TargetData(M.get()));
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}
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// If the -strip-debug command line option was specified, add it. If
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// -std-compile-opts was also specified, it will handle StripDebug.
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if (StripDebug && !StandardCompileOpts)
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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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// Check to see if -std-compile-opts was specified before this option. If
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// so, handle it.
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if (StandardCompileOpts &&
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StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
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AddStandardCompilePasses(Passes);
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StandardCompileOpts = false;
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}
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if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
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AddOptimizationPasses(Passes, *FPasses, 1);
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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);
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OptLevelO2 = false;
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}
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if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
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AddOptimizationPasses(Passes, *FPasses, 3);
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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 = 0;
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if (PassInf->getNormalCtor())
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P = PassInf->getNormalCtor()();
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else
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cerr << argv[0] << ": cannot create pass: "
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<< PassInf->getPassName() << "\n";
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if (P) {
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bool isBBPass = dynamic_cast<BasicBlockPass*>(P) != 0;
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bool isLPass = !isBBPass && dynamic_cast<LoopPass*>(P) != 0;
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bool isFPass = !isLPass && dynamic_cast<FunctionPass*>(P) != 0;
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bool isCGSCCPass = !isFPass && dynamic_cast<CallGraphSCCPass*>(P) != 0;
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addPass(Passes, P);
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if (AnalyzeOnly) {
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if (isBBPass)
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Passes.add(new BasicBlockPassPrinter(PassInf));
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else if (isLPass)
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Passes.add(new LoopPassPrinter(PassInf));
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else if (isFPass)
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Passes.add(new FunctionPassPrinter(PassInf));
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else if (isCGSCCPass)
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Passes.add(new CallGraphSCCPassPrinter(PassInf));
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else
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Passes.add(new ModulePassPrinter(PassInf));
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}
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}
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if (PrintEachXForm)
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Passes.add(createPrintModulePass(&errs()));
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}
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// If -std-compile-opts was specified at the end of the pass list, add them.
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if (StandardCompileOpts) {
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AddStandardCompilePasses(Passes);
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StandardCompileOpts = false;
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}
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if (OptLevelO1) {
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AddOptimizationPasses(Passes, *FPasses, 1);
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}
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if (OptLevelO2) {
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AddOptimizationPasses(Passes, *FPasses, 2);
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}
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if (OptLevelO3) {
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AddOptimizationPasses(Passes, *FPasses, 3);
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}
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if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
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for (Module::iterator I = M.get()->begin(), E = M.get()->end();
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I != E; ++I)
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FPasses->run(*I);
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}
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// Check that the module is well formed on completion of optimization
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if (!NoVerify && !VerifyEach)
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Passes.add(createVerifierPass());
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// Write bitcode out to disk or cout as the last step...
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if (!NoOutput && !AnalyzeOnly)
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Passes.add(createBitcodeWriterPass(*Out));
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// Now that we have all of the passes ready, run them.
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Passes.run(*M.get());
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// Delete the ofstream.
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if (Out != &outs())
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delete Out;
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return 0;
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} catch (const std::string& msg) {
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cerr << argv[0] << ": " << msg << "\n";
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} catch (...) {
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cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
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}
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llvm_shutdown();
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return 1;
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}
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