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217 lines
7.7 KiB
C++
217 lines
7.7 KiB
C++
//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
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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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// This is the llc code generator.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Target/TargetMachineImpls.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Pass.h"
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#include "Support/CommandLine.h"
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#include "Support/Signals.h"
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#include <memory>
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#include <fstream>
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using namespace llvm;
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// General options for llc. Other pass-specific options are specified
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// within the corresponding llc passes, and target-specific options
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// and back-end code generation options are specified with the target machine.
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//
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
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static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
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enum ArchName { noarch, X86, SparcV8, SparcV9, PowerPC, CBackend };
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static cl::opt<ArchName>
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Arch("march", cl::desc("Architecture to generate assembly for:"), cl::Prefix,
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cl::values(clEnumValN(X86, "x86", " IA-32 (Pentium and above)"),
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clEnumValN(SparcV8, "sparcv8", " SPARC V8 (experimental)"),
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clEnumValN(SparcV9, "sparcv9", " SPARC V9"),
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clEnumValN(PowerPC, "powerpc", " PowerPC (experimental)"),
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clEnumValN(CBackend, "c", " C backend"),
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0),
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cl::init(noarch));
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// GetFileNameRoot - Helper function to get the basename of a filename...
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static inline std::string
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GetFileNameRoot(const std::string &InputFilename)
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{
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std::string IFN = InputFilename;
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std::string outputFilename;
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int Len = IFN.length();
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if ((Len > 2) &&
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IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
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outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
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} else {
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outputFilename = IFN;
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}
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return outputFilename;
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}
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// main - Entry point for the llc compiler.
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//
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
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PrintStackTraceOnErrorSignal();
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// Load the module to be compiled...
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std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
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if (M.get() == 0) {
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std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
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return 1;
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}
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Module &mod = *M.get();
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// Allocate target machine. First, check whether the user has
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// explicitly specified an architecture to compile for.
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TargetMachine* (*TargetMachineAllocator)(const Module&,
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IntrinsicLowering *) = 0;
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switch (Arch) {
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case CBackend:
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TargetMachineAllocator = allocateCTargetMachine;
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break;
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case X86:
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TargetMachineAllocator = allocateX86TargetMachine;
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break;
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case SparcV9:
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TargetMachineAllocator = allocateSparcV9TargetMachine;
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break;
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case SparcV8:
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TargetMachineAllocator = allocateSparcV8TargetMachine;
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break;
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case PowerPC:
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TargetMachineAllocator = allocatePowerPCTargetMachine;
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break;
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default:
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// Decide what the default target machine should be, by looking at
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// the module. This heuristic (ILP32, LE -> IA32; LP64, BE ->
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// SPARCV9) is kind of gross, but it will work until we have more
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// sophisticated target information to work from.
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if (mod.getEndianness() == Module::LittleEndian &&
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mod.getPointerSize() == Module::Pointer32) {
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TargetMachineAllocator = allocateX86TargetMachine;
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} else if (mod.getEndianness() == Module::BigEndian &&
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mod.getPointerSize() == Module::Pointer32) {
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TargetMachineAllocator = allocatePowerPCTargetMachine;
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} else if (mod.getEndianness() == Module::BigEndian &&
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mod.getPointerSize() == Module::Pointer64) {
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TargetMachineAllocator = allocateSparcV9TargetMachine;
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} else {
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// If the module is target independent, favor a target which matches the
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// current build system.
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#if defined(i386) || defined(__i386__) || defined(__x86__)
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TargetMachineAllocator = allocateX86TargetMachine;
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#elif defined(sparc) || defined(__sparc__) || defined(__sparcv9)
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TargetMachineAllocator = allocateSparcV9TargetMachine;
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#elif defined(__POWERPC__) || defined(__ppc__) || defined(__APPLE__)
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TargetMachineAllocator = allocatePowerPCTargetMachine;
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#else
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std::cerr << argv[0] << ": module does not specify a target to use. "
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<< "You must use the -march option. If no native target is "
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<< "available, use -march=c to emit C code.\n";
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return 1;
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#endif
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}
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break;
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}
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std::auto_ptr<TargetMachine> target(TargetMachineAllocator(mod, 0));
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assert(target.get() && "Could not allocate target machine!");
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TargetMachine &Target = *target.get();
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const TargetData &TD = Target.getTargetData();
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// Build up all of the passes that we want to do to the module...
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PassManager Passes;
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Passes.add(new TargetData("llc", TD.isLittleEndian(), TD.getPointerSize(),
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TD.getPointerAlignment(), TD.getDoubleAlignment()));
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// Figure out where we are going to send the output...
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std::ostream *Out = 0;
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if (OutputFilename != "") {
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if (OutputFilename != "-") {
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// Specified an output filename?
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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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std::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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Out = new std::ofstream(OutputFilename.c_str());
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// Make sure that the Out file gets unlinked from the disk if we get a
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// SIGINT
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RemoveFileOnSignal(OutputFilename);
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} else {
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Out = &std::cout;
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}
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} else {
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if (InputFilename == "-") {
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OutputFilename = "-";
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Out = &std::cout;
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} else {
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OutputFilename = GetFileNameRoot(InputFilename);
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if (Arch != CBackend)
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OutputFilename += ".s";
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else
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OutputFilename += ".cbe.c";
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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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std::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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Out = new std::ofstream(OutputFilename.c_str());
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if (!Out->good()) {
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std::cerr << argv[0] << ": error opening " << OutputFilename << "!\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 Out file gets unlinked from the disk if we get a
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// SIGINT
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RemoveFileOnSignal(OutputFilename);
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}
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}
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// Ask the target to add backend passes as necessary
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if (Target.addPassesToEmitAssembly(Passes, *Out)) {
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std::cerr << argv[0] << ": target '" << Target.getName()
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<< "' does not support static compilation!\n";
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if (Out != &std::cout) delete Out;
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// And the Out file is empty and useless, so remove it now.
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std::remove(OutputFilename.c_str());
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return 1;
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} else {
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// Run our queue of passes all at once now, efficiently.
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Passes.run(*M.get());
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}
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// Delete the ostream if it's not a stdout stream
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if (Out != &std::cout) delete Out;
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return 0;
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}
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