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//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
//
// This is the llc compiler driver.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bytecode/Reader.h"
#include "llvm/Target/TargetMachineImpls.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Pass.h"
#include "llvm/Support/PassNameParser.h"
#include "Support/CommandLine.h"
#include "Support/Signals.h"
#include <memory>
#include <fstream>
//------------------------------------------------------------------------------
// Option declarations for LLC.
//------------------------------------------------------------------------------
// Make all registered optimization passes available to llc. These passes
// will all be run before the simplification and lowering steps used by the
// back-end code generator, and will be run in the order specified on the
// command line. The OptimizationList is automatically populated with
// registered Passes by the PassNameParser.
//
static cl::list<const PassInfo*, bool,
FilteredPassNameParser<PassInfo::Optimization> >
OptimizationList(cl::desc("Optimizations available:"));
// General options for llc. Other pass-specific options are specified
// within the corresponding llc passes, and target-specific options
// and back-end code generation options are specified with the target machine.
//
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
static cl::opt<bool>
DisableStrip("disable-strip",
cl::desc("Do not strip the LLVM bytecode included in the executable"));
static cl::opt<bool>
DumpAsm("d", cl::desc("Print bytecode before native code generation"),
cl::Hidden);
// GetFileNameRoot - Helper function to get the basename of a filename...
static inline std::string
GetFileNameRoot(const std::string &InputFilename)
{
std::string IFN = InputFilename;
std::string outputFilename;
int Len = IFN.length();
if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
} else {
outputFilename = IFN;
}
return outputFilename;
}
//===---------------------------------------------------------------------===//
// Function main()
//
// Entry point for the llc compiler.
//===---------------------------------------------------------------------===//
int
main(int argc, char **argv)
{
cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
// Allocate a target... in the future this will be controllable on the
// command line.
std::auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
assert(target.get() && "Could not allocate target machine!");
TargetMachine &Target = *target.get();
const TargetData &TD = Target.getTargetData();
// Load the module to be compiled...
std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
if (M.get() == 0)
{
std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
return 1;
}
// Build up all of the passes that we want to do to the module...
PassManager Passes;
Passes.add(new TargetData("llc", TD.isLittleEndian(), TD.getPointerSize(),
TD.getPointerAlignment(), TD.getDoubleAlignment()));
// Create a new optimization pass for each one specified on the command line
// Deal specially with tracing passes, which must be run differently than opt.
//
for (unsigned i = 0; i < OptimizationList.size(); ++i) {
const PassInfo *Opt = OptimizationList[i];
// handle other passes as normal optimization passes
if (Opt->getNormalCtor())
Passes.add(Opt->getNormalCtor()());
else if (Opt->getTargetCtor())
Passes.add(Opt->getTargetCtor()(Target));
else
std::cerr << argv[0] << ": cannot create pass: "
<< Opt->getPassName() << "\n";
}
// Replace malloc and free instructions with library calls.
// Do this after tracing until lli implements these lib calls.
// For now, it will emulate malloc and free internally.
// FIXME: This is sparc specific!
Passes.add(createLowerAllocationsPass());
// If LLVM dumping after transformations is requested, add it to the pipeline
if (DumpAsm)
Passes.add(new PrintFunctionPass("Code after xformations: \n", &std::cerr));
// Strip all of the symbols from the bytecode so that it will be smaller...
if (!DisableStrip)
Passes.add(createSymbolStrippingPass());
// Figure out where we are going to send the output...
std::ostream *Out = 0;
if (OutputFilename != "") {
// Specified an output filename?
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
std::cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str());
// Make sure that the Out file gets unlink'd from the disk if we get a
// SIGINT
RemoveFileOnSignal(OutputFilename);
} else {
if (InputFilename == "-") {
OutputFilename = "-";
Out = &std::cout;
} else {
std::string OutputFilename = GetFileNameRoot(InputFilename);
OutputFilename += ".s";
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
std::cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str());
if (!Out->good()) {
std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
delete Out;
return 1;
}
// Make sure that the Out file gets unlink'd from the disk if we get a
// SIGINT
RemoveFileOnSignal(OutputFilename);
}
}
// Ask the target to add backend passes as neccesary
if (Target.addPassesToEmitAssembly(Passes, *Out)) {
std::cerr << argv[0] << ": target '" << Target.getName()
<< " does not support static compilation!\n";
} else {
// Run our queue of passes all at once now, efficiently.
Passes.run(*M.get());
}
// Delete the ostream if it's not a stdout stream
if (Out != &std::cout) delete Out;
return 0;
}
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