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+//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This is the llc code generator driver. It provides a convenient
+// command-line interface for generating native assembly-language code
+// or C code, given LLVM bitcode.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include "llvm/Pass.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Support/IRReader.h"
+#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
+#include "llvm/CodeGen/LinkAllCodegenComponents.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/System/Host.h"
+#include "llvm/System/Signals.h"
+#include "llvm/Target/SubtargetFeature.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetRegistry.h"
+#include "llvm/Target/TargetSelect.h"
+#include <memory>
+using namespace llvm;
+
+// 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 bitcode>"), cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
+
+// Determine optimization level.
+static cl::opt<char>
+OptLevel("O",
+ cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
+ "(default = '-O2')"),
+ cl::Prefix,
+ cl::ZeroOrMore,
+ cl::init(' '));
+
+static cl::opt<std::string>
+TargetTriple("mtriple", cl::desc("Override target triple for module"));
+
+static cl::opt<std::string>
+MArch("march", cl::desc("Architecture to generate code for (see --version)"));
+
+static cl::opt<std::string>
+MCPU("mcpu",
+ cl::desc("Target a specific cpu type (-mcpu=help for details)"),
+ cl::value_desc("cpu-name"),
+ cl::init(""));
+
+static cl::list<std::string>
+MAttrs("mattr",
+ cl::CommaSeparated,
+ cl::desc("Target specific attributes (-mattr=help for details)"),
+ cl::value_desc("a1,+a2,-a3,..."));
+
+cl::opt<TargetMachine::CodeGenFileType>
+FileType("filetype", cl::init(TargetMachine::CGFT_AssemblyFile),
+ cl::desc("Choose a file type (not all types are supported by all targets):"),
+ cl::values(
+ clEnumValN(TargetMachine::CGFT_AssemblyFile, "asm",
+ "Emit an assembly ('.s') file"),
+ clEnumValN(TargetMachine::CGFT_ObjectFile, "obj",
+ "Emit a native object ('.o') file [experimental]"),
+ clEnumValN(TargetMachine::CGFT_Null, "null",
+ "Emit nothing, for performance testing"),
+ clEnumValEnd));
+
+cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
+ cl::desc("Do not verify input module"));
+
+
+static cl::opt<bool>
+DisableRedZone("disable-red-zone",
+ cl::desc("Do not emit code that uses the red zone."),
+ cl::init(false));
+
+static cl::opt<bool>
+NoImplicitFloats("no-implicit-float",
+ cl::desc("Don't generate implicit floating point instructions (x86-only)"),
+ cl::init(false));
+
+// 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 ((Len > 2) &&
+ IFN[Len-3] == '.' &&
+ ((IFN[Len-2] == 'b' && IFN[Len-1] == 'c') ||
+ (IFN[Len-2] == 'l' && IFN[Len-1] == 'l'))) {
+ outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
+ } else {
+ outputFilename = IFN;
+ }
+ return outputFilename;
+}
+
+static formatted_raw_ostream *GetOutputStream(const char *TargetName,
+ Triple::OSType OS,
+ const char *ProgName) {
+ if (OutputFilename != "") {
+ if (OutputFilename == "-")
+ return new formatted_raw_ostream(outs(),
+ formatted_raw_ostream::PRESERVE_STREAM);
+
+ // Make sure that the Out file gets unlinked from the disk if we get a
+ // SIGINT
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+
+ std::string error;
+ raw_fd_ostream *FDOut =
+ new raw_fd_ostream(OutputFilename.c_str(), error,
+ raw_fd_ostream::F_Binary);
+ if (!error.empty()) {
+ errs() << error << '\n';
+ delete FDOut;
+ return 0;
+ }
+ formatted_raw_ostream *Out =
+ new formatted_raw_ostream(*FDOut, formatted_raw_ostream::DELETE_STREAM);
+
+ return Out;
+ }
+
+ if (InputFilename == "-") {
+ OutputFilename = "-";
+ return new formatted_raw_ostream(outs(),
+ formatted_raw_ostream::PRESERVE_STREAM);
+ }
+
+ OutputFilename = GetFileNameRoot(InputFilename);
+
+ bool Binary = false;
+ switch (FileType) {
+ default: assert(0 && "Unknown file type");
+ case TargetMachine::CGFT_AssemblyFile:
+ if (TargetName[0] == 'c') {
+ if (TargetName[1] == 0)
+ OutputFilename += ".cbe.c";
+ else if (TargetName[1] == 'p' && TargetName[2] == 'p')
+ OutputFilename += ".cpp";
+ else
+ OutputFilename += ".s";
+ } else
+ OutputFilename += ".s";
+ break;
+ case TargetMachine::CGFT_ObjectFile:
+ if (OS == Triple::Win32)
+ OutputFilename += ".obj";
+ else
+ OutputFilename += ".o";
+ Binary = true;
+ break;
+ case TargetMachine::CGFT_Null:
+ OutputFilename += ".null";
+ Binary = true;
+ break;
+ }
+
+ // Make sure that the Out file gets unlinked from the disk if we get a
+ // SIGINT
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+
+ std::string error;
+ unsigned OpenFlags = 0;
+ if (Binary) OpenFlags |= raw_fd_ostream::F_Binary;
+ raw_fd_ostream *FDOut = new raw_fd_ostream(OutputFilename.c_str(), error,
+ OpenFlags);
+ if (!error.empty()) {
+ errs() << error << '\n';
+ delete FDOut;
+ return 0;
+ }
+
+ formatted_raw_ostream *Out =
+ new formatted_raw_ostream(*FDOut, formatted_raw_ostream::DELETE_STREAM);
+
+ return Out;
+}
+
+// main - Entry point for the llc compiler.
+//
+int main(int argc, char **argv) {
+ sys::PrintStackTraceOnErrorSignal();
+ PrettyStackTraceProgram X(argc, argv);
+
+ // Enable debug stream buffering.
+ EnableDebugBuffering = true;
+
+ LLVMContext &Context = getGlobalContext();
+ llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
+
+ // Initialize targets first, so that --version shows registered targets.
+ InitializeAllTargets();
+ InitializeAllAsmPrinters();
+ InitializeAllAsmParsers();
+
+ cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
+
+ // Load the module to be compiled...
+ SMDiagnostic Err;
+ std::auto_ptr<Module> M;
+
+ M.reset(ParseIRFile(InputFilename, Err, Context));
+ if (M.get() == 0) {
+ Err.Print(argv[0], errs());
+ return 1;
+ }
+ Module &mod = *M.get();
+
+ // If we are supposed to override the target triple, do so now.
+ if (!TargetTriple.empty())
+ mod.setTargetTriple(TargetTriple);
+
+ Triple TheTriple(mod.getTargetTriple());
+ if (TheTriple.getTriple().empty())
+ TheTriple.setTriple(sys::getHostTriple());
+
+ // Allocate target machine. First, check whether the user has explicitly
+ // specified an architecture to compile for. If so we have to look it up by
+ // name, because it might be a backend that has no mapping to a target triple.
+ const Target *TheTarget = 0;
+ if (!MArch.empty()) {
+ for (TargetRegistry::iterator it = TargetRegistry::begin(),
+ ie = TargetRegistry::end(); it != ie; ++it) {
+ if (MArch == it->getName()) {
+ TheTarget = &*it;
+ break;
+ }
+ }
+
+ if (!TheTarget) {
+ errs() << argv[0] << ": error: invalid target '" << MArch << "'.\n";
+ return 1;
+ }
+
+ // Adjust the triple to match (if known), otherwise stick with the
+ // module/host triple.
+ Triple::ArchType Type = Triple::getArchTypeForLLVMName(MArch);
+ if (Type != Triple::UnknownArch)
+ TheTriple.setArch(Type);
+ } else {
+ std::string Err;
+ TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Err);
+ if (TheTarget == 0) {
+ errs() << argv[0] << ": error auto-selecting target for module '"
+ << Err << "'. Please use the -march option to explicitly "
+ << "pick a target.\n";
+ return 1;
+ }
+ }
+
+ // Package up features to be passed to target/subtarget
+ std::string FeaturesStr;
+ if (MCPU.size() || MAttrs.size()) {
+ SubtargetFeatures Features;
+ Features.setCPU(MCPU);
+ for (unsigned i = 0; i != MAttrs.size(); ++i)
+ Features.AddFeature(MAttrs[i]);
+ FeaturesStr = Features.getString();
+ }
+
+ std::auto_ptr<TargetMachine>
+ target(TheTarget->createTargetMachine(TheTriple.getTriple(), FeaturesStr));
+ assert(target.get() && "Could not allocate target machine!");
+ TargetMachine &Target = *target.get();
+
+ // Figure out where we are going to send the output...
+ formatted_raw_ostream *Out = GetOutputStream(TheTarget->getName(),
+ TheTriple.getOS(), argv[0]);
+ if (Out == 0) return 1;
+
+ CodeGenOpt::Level OLvl = CodeGenOpt::Default;
+ switch (OptLevel) {
+ default:
+ errs() << argv[0] << ": invalid optimization level.\n";
+ return 1;
+ case ' ': break;
+ case '0': OLvl = CodeGenOpt::None; break;
+ case '1': OLvl = CodeGenOpt::Less; break;
+ case '2': OLvl = CodeGenOpt::Default; break;
+ case '3': OLvl = CodeGenOpt::Aggressive; break;
+ }
+
+ // Request that addPassesToEmitFile run the Verifier after running
+ // passes which modify the IR.
+#ifndef NDEBUG
+ bool DisableVerify = false;
+#else
+ bool DisableVerify = true;
+#endif
+
+ // Build up all of the passes that we want to do to the module.
+ PassManager PM;
+
+ // Add the target data from the target machine, if it exists, or the module.
+ if (const TargetData *TD = Target.getTargetData())
+ PM.add(new TargetData(*TD));
+ else
+ PM.add(new TargetData(&mod));
+
+ if (!NoVerify)
+ PM.add(createVerifierPass());
+
+ // Override default to generate verbose assembly.
+ Target.setAsmVerbosityDefault(true);
+
+ // Ask the target to add backend passes as necessary.
+ if (Target.addPassesToEmitFile(PM, *Out, FileType, OLvl,
+ DisableVerify)) {
+ errs() << argv[0] << ": target does not support generation of this"
+ << " file type!\n";
+ delete Out;
+ // And the Out file is empty and useless, so remove it now.
+ sys::Path(OutputFilename).eraseFromDisk();
+ return 1;
+ }
+
+ PM.run(mod);
+
+ // Delete the ostream.
+ delete Out;
+
+ return 0;
+}
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