forked from OSchip/llvm-project
268 lines
8.5 KiB
C++
268 lines
8.5 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Bytecode/WriteBytecodePass.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/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/PluginLoader.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/Timer.h"
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#include "llvm/LinkAllPasses.h"
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#include "llvm/LinkAllVMCore.h"
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#include <iostream>
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#include <fstream>
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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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static cl::opt<bool> NoCompress("disable-compression", cl::init(false),
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cl::desc("Don't compress the generated bytecode"));
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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 bytecode 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 bytecode 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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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 Timer BytecodeLoadTimer("Bytecode Loader");
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// ---------- Define Printers for module and function passes ------------
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namespace {
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struct ModulePassPrinter : public ModulePass {
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const PassInfo *PassToPrint;
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ModulePassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
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virtual bool runOnModule(Module &M) {
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if (!Quiet) {
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llvm_cout << "Printing analysis '" << PassToPrint->getPassName()
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<< "':\n";
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getAnalysisID<Pass>(PassToPrint).print(llvm_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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struct FunctionPassPrinter : public FunctionPass {
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const PassInfo *PassToPrint;
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FunctionPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
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virtual bool runOnFunction(Function &F) {
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if (!Quiet) {
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llvm_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(llvm_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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struct BasicBlockPassPrinter : public BasicBlockPass {
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const PassInfo *PassToPrint;
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BasicBlockPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
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virtual bool runOnBasicBlock(BasicBlock &BB) {
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if (!Quiet) {
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llvm_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(
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llvm_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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} // 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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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(ParseBytecodeFile(InputFilename, &ErrorMessage));
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if (M.get() == 0) {
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llvm_cerr << argv[0] << ": ";
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if (ErrorMessage.size())
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llvm_cerr << ErrorMessage << "\n";
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else
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llvm_cerr << "bytecode 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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std::ostream *Out = &std::cout; // Default to printing to stdout...
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if (OutputFilename != "-") {
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if (!Force && std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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llvm_cerr << argv[0] << ": error opening '" << OutputFilename
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<< "': file exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
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std::ios::binary;
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Out = new std::ofstream(OutputFilename.c_str(), io_mode);
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if (!Out->good()) {
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llvm_cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
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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 && CheckBytecodeOutputToConsole(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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// 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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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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llvm_cerr << argv[0] << ": cannot create pass: "
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<< PassInf->getPassName() << "\n";
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if (P) {
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Passes.add(P);
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if (AnalyzeOnly) {
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if (dynamic_cast<BasicBlockPass*>(P))
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Passes.add(new BasicBlockPassPrinter(PassInf));
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else if (dynamic_cast<FunctionPass*>(P))
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Passes.add(new FunctionPassPrinter(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(new PrintModulePass(&llvm_cerr));
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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)
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Passes.add(createVerifierPass());
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// Write bytecode out to disk or cout as the last step...
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llvm_ostream L(*Out);
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if (!NoOutput && !AnalyzeOnly)
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Passes.add(new WriteBytecodePass(&L, false, !NoCompress));
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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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return 0;
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} catch (const std::string& msg) {
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llvm_cerr << argv[0] << ": " << msg << "\n";
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} catch (...) {
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llvm_cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
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}
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return 1;
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}
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