forked from OSchip/llvm-project
249 lines
8.5 KiB
C++
249 lines
8.5 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 driver. It provides a convenient
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// command-line interface for generating native assembly-language code
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// or C code, given LLVM bytecode.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/CodeGen/LinkAllCodegenComponents.h"
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#include "llvm/Target/SubtargetFeature.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/Target/TargetMachineRegistry.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 "llvm/Support/CommandLine.h"
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#include "llvm/Support/PluginLoader.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/System/Signals.h"
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#include "llvm/Config/config.h"
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#include "llvm/LinkAllVMCore.h"
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#include <fstream>
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#include <iostream>
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#include <memory>
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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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static cl::opt<bool> Fast("fast",
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cl::desc("Generate code quickly, potentially sacrificing code quality"));
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static cl::opt<std::string>
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TargetTriple("mtriple", cl::desc("Override target triple for module"));
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static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
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MArch("march", cl::desc("Architecture to generate code for:"));
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static cl::opt<std::string>
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MCPU("mcpu",
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cl::desc("Target a specific cpu type (-mcpu=help for details)"),
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cl::value_desc("cpu-name"),
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cl::init(""));
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static cl::list<std::string>
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MAttrs("mattr",
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cl::CommaSeparated,
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cl::desc("Target specific attributes (-mattr=help for details)"),
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cl::value_desc("a1,+a2,-a3,..."));
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cl::opt<TargetMachine::CodeGenFileType>
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FileType("filetype", cl::init(TargetMachine::AssemblyFile),
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cl::desc("Choose a file type (not all types are supported by all targets):"),
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cl::values(
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clEnumValN(TargetMachine::AssemblyFile, "asm",
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" Emit an assembly ('.s') file"),
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clEnumValN(TargetMachine::ObjectFile, "obj",
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" Emit a native object ('.o') file [experimental]"),
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clEnumValN(TargetMachine::DynamicLibrary, "dynlib",
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" Emit a native dynamic library ('.so') file"),
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clEnumValEnd));
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cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
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cl::desc("Do not verify input module"));
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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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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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try {
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cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
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sys::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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// If we are supposed to override the target triple, do so now.
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if (!TargetTriple.empty())
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mod.setTargetTriple(TargetTriple);
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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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if (MArch == 0) {
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std::string Err;
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MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
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if (MArch == 0) {
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std::cerr << argv[0] << ": error auto-selecting target for module '"
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<< Err << "'. Please use the -march option to explicitly "
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<< "pick a target.\n";
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return 1;
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}
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}
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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if (MCPU.size() || MAttrs.size()) {
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SubtargetFeatures Features;
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Features.setCPU(MCPU);
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for (unsigned i = 0; i != MAttrs.size(); ++i)
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Features.AddFeature(MAttrs[i]);
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FeaturesStr = Features.getString();
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}
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std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, FeaturesStr));
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assert(target.get() && "Could not allocate target machine!");
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TargetMachine &Target = *target.get();
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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(*Target.getTargetData()));
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#ifndef NDEBUG
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if(!NoVerify)
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Passes.add(createVerifierPass());
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#endif
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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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sys::RemoveFileOnSignal(sys::Path(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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switch (FileType) {
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case TargetMachine::AssemblyFile:
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if (MArch->Name[0] != 'c' || MArch->Name[1] != 0) // not CBE
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OutputFilename += ".s";
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else
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OutputFilename += ".cbe.c";
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break;
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case TargetMachine::ObjectFile:
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OutputFilename += ".o";
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break;
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case TargetMachine::DynamicLibrary:
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OutputFilename += LTDL_SHLIB_EXT;
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break;
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}
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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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sys::RemoveFileOnSignal(sys::Path(OutputFilename));
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}
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}
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if (FileType != TargetMachine::AssemblyFile)
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std::cerr << "WARNING: only -filetype=asm is currently supported.\n";
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// Ask the target to add backend passes as necessary.
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if (Target.addPassesToEmitFile(Passes, *Out, FileType, Fast)) {
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std::cerr << argv[0] << ": target '" << Target.getName()
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<< "' does not support generation of this file type!\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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sys::Path(OutputFilename).eraseFromDisk();
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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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} catch (const std::string& msg) {
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std::cerr << argv[0] << ": " << msg << "\n";
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} catch (...) {
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std::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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