llvm-6502/tools/opt/opt.cpp
2007-01-21 06:34:18 +00:00

268 lines
8.5 KiB
C++

//===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Optimizations may be specified an arbitrary number of times on the command
// line, They are run in the order specified.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/PassNameParser.h"
#include "llvm/System/Signals.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/PluginLoader.h"
#include "llvm/Support/Streams.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/Support/Timer.h"
#include "llvm/LinkAllPasses.h"
#include "llvm/LinkAllVMCore.h"
#include <iostream>
#include <fstream>
#include <memory>
#include <algorithm>
using namespace llvm;
// The OptimizationList is automatically populated with registered Passes by the
// PassNameParser.
//
static cl::list<const PassInfo*, bool, PassNameParser>
PassList(cl::desc("Optimizations available:"));
static cl::opt<bool> NoCompress("disable-compression", cl::init(true),
cl::desc("Don't compress the generated bytecode"));
// Other command line options...
//
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bytecode file>"),
cl::init("-"), cl::value_desc("filename"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"),
cl::value_desc("filename"), cl::init("-"));
static cl::opt<bool>
Force("f", cl::desc("Overwrite output files"));
static cl::opt<bool>
PrintEachXForm("p", cl::desc("Print module after each transformation"));
static cl::opt<bool>
NoOutput("disable-output",
cl::desc("Do not write result bytecode file"), cl::Hidden);
static cl::opt<bool>
NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
static cl::opt<bool>
Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
static cl::alias
QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
static cl::opt<bool>
AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
static Timer BytecodeLoadTimer("Bytecode Loader");
// ---------- Define Printers for module and function passes ------------
namespace {
struct ModulePassPrinter : public ModulePass {
const PassInfo *PassToPrint;
ModulePassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
virtual bool runOnModule(Module &M) {
if (!Quiet) {
cout << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
getAnalysisID<Pass>(PassToPrint).print(cout, &M);
}
// Get and print pass...
return false;
}
virtual const char *getPassName() const { return "'Pass' Printer"; }
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredID(PassToPrint);
AU.setPreservesAll();
}
};
struct FunctionPassPrinter : public FunctionPass {
const PassInfo *PassToPrint;
FunctionPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
virtual bool runOnFunction(Function &F) {
if (!Quiet) {
cout << "Printing analysis '" << PassToPrint->getPassName()
<< "' for function '" << F.getName() << "':\n";
}
// Get and print pass...
getAnalysisID<Pass>(PassToPrint).print(cout, F.getParent());
return false;
}
virtual const char *getPassName() const { return "FunctionPass Printer"; }
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredID(PassToPrint);
AU.setPreservesAll();
}
};
struct BasicBlockPassPrinter : public BasicBlockPass {
const PassInfo *PassToPrint;
BasicBlockPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
virtual bool runOnBasicBlock(BasicBlock &BB) {
if (!Quiet) {
cout << "Printing Analysis info for BasicBlock '" << BB.getName()
<< "': Pass " << PassToPrint->getPassName() << ":\n";
}
// Get and print pass...
getAnalysisID<Pass>(PassToPrint).print(cout, BB.getParent()->getParent());
return false;
}
virtual const char *getPassName() const { return "BasicBlockPass Printer"; }
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredID(PassToPrint);
AU.setPreservesAll();
}
};
} // anonymous namespace
//===----------------------------------------------------------------------===//
// main for opt
//
int main(int argc, char **argv) {
llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
try {
cl::ParseCommandLineOptions(argc, argv,
" llvm .bc -> .bc modular optimizer and analysis printer \n");
sys::PrintStackTraceOnErrorSignal();
// Allocate a full target machine description only if necessary.
// FIXME: The choice of target should be controllable on the command line.
std::auto_ptr<TargetMachine> target;
std::string ErrorMessage;
// Load the input module...
std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
if (M.get() == 0) {
cerr << argv[0] << ": ";
if (ErrorMessage.size())
cerr << ErrorMessage << "\n";
else
cerr << "bytecode didn't read correctly.\n";
return 1;
}
// Figure out what stream we are supposed to write to...
// FIXME: cout is not binary!
std::ostream *Out = &std::cout; // Default to printing to stdout...
if (OutputFilename != "-") {
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
std::ios::binary;
Out = new std::ofstream(OutputFilename.c_str(), io_mode);
if (!Out->good()) {
cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
return 1;
}
// Make sure that the Output file gets unlinked from the disk if we get a
// SIGINT
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
}
// If the output is set to be emitted to standard out, and standard out is a
// console, print out a warning message and refuse to do it. We don't
// impress anyone by spewing tons of binary goo to a terminal.
if (!Force && !NoOutput && CheckBytecodeOutputToConsole(Out,!Quiet)) {
NoOutput = true;
}
// Create a PassManager to hold and optimize the collection of passes we are
// about to build...
//
PassManager Passes;
// Add an appropriate TargetData instance for this module...
Passes.add(new TargetData(M.get()));
// Create a new optimization pass for each one specified on the command line
for (unsigned i = 0; i < PassList.size(); ++i) {
const PassInfo *PassInf = PassList[i];
Pass *P = 0;
if (PassInf->getNormalCtor())
P = PassInf->getNormalCtor()();
else
cerr << argv[0] << ": cannot create pass: "
<< PassInf->getPassName() << "\n";
if (P) {
Passes.add(P);
if (AnalyzeOnly) {
if (dynamic_cast<BasicBlockPass*>(P))
Passes.add(new BasicBlockPassPrinter(PassInf));
else if (dynamic_cast<FunctionPass*>(P))
Passes.add(new FunctionPassPrinter(PassInf));
else
Passes.add(new ModulePassPrinter(PassInf));
}
}
if (PrintEachXForm)
Passes.add(new PrintModulePass(&cerr));
}
// Check that the module is well formed on completion of optimization
if (!NoVerify)
Passes.add(createVerifierPass());
// Write bytecode out to disk or cout as the last step...
OStream L(*Out);
if (!NoOutput && !AnalyzeOnly)
Passes.add(new WriteBytecodePass(&L, false, !NoCompress));
// Now that we have all of the passes ready, run them.
Passes.run(*M.get());
return 0;
} catch (const std::string& msg) {
cerr << argv[0] << ": " << msg << "\n";
} catch (...) {
cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
}
return 1;
}