//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
-//
+//
// 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.
-//
+// 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 bytecode.
+// command-line interface for generating native assembly-language code
+// or C code, given LLVM bitcode.
//
//===----------------------------------------------------------------------===//
-#include "llvm/Bytecode/Reader.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/CodeGen/FileWriters.h"
+#include "llvm/CodeGen/LinkAllCodegenComponents.h"
+#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
+#include "llvm/Target/SubtargetFeature.h"
+#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetMachineRegistry.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Module.h"
+#include "llvm/ModuleProvider.h"
#include "llvm/PassManager.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PluginLoader.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/RegistryParser.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Analysis/Verifier.h"
#include "llvm/System/Signals.h"
+#include "llvm/Config/config.h"
+#include "llvm/LinkAllVMCore.h"
+#include "llvm/InitializeAllTargets.h"
+#include "llvm/InitializeAllAsmPrinters.h"
#include <fstream>
#include <iostream>
#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 bytecode>"), cl::init("-"));
+InputFilename(cl::Positional, cl::desc("<input bitcode>"), 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<const TargetMachineRegistry::Entry*, false, TargetNameParser>
-MArch("march", cl::desc("Architecture to generate assembly for:"));
-
-// GetFileNameRoot - Helper function to get the basename of a 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<const TargetMachineRegistry::entry*, false,
+ RegistryParser<TargetMachine> >
+MArch("march", cl::desc("Architecture to generate code for:"));
+
+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::AssemblyFile),
+ cl::desc("Choose a file type (not all types are supported by all targets):"),
+ cl::values(
+ clEnumValN(TargetMachine::AssemblyFile, "asm",
+ "Emit an assembly ('.s') file"),
+ clEnumValN(TargetMachine::ObjectFile, "obj",
+ "Emit a native object ('.o') file [experimental]"),
+ clEnumValN(TargetMachine::DynamicLibrary, "dynlib",
+ "Emit a native dynamic library ('.so') file"
+ " [experimental]"),
+ 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;
return outputFilename;
}
+static raw_ostream *GetOutputStream(const char *ProgName) {
+ if (OutputFilename != "") {
+ if (OutputFilename == "-")
+ return &outs();
+
+ // 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 << ProgName << ": error opening '" << OutputFilename
+ << "': file exists!\n"
+ << "Use -f command line argument to force output\n";
+ return 0;
+ }
+ // 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_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), true, error);
+ if (!error.empty()) {
+ std::cerr << error << '\n';
+ delete Out;
+ return 0;
+ }
+
+ return Out;
+ }
+
+ if (InputFilename == "-") {
+ OutputFilename = "-";
+ return &outs();
+ }
+
+ OutputFilename = GetFileNameRoot(InputFilename);
+
+ bool Binary = false;
+ switch (FileType) {
+ case TargetMachine::AssemblyFile:
+ if (MArch->Name[0] == 'c') {
+ if (MArch->Name[1] == 0)
+ OutputFilename += ".cbe.c";
+ else if (MArch->Name[1] == 'p' && MArch->Name[2] == 'p')
+ OutputFilename += ".cpp";
+ else
+ OutputFilename += ".s";
+ } else
+ OutputFilename += ".s";
+ break;
+ case TargetMachine::ObjectFile:
+ OutputFilename += ".o";
+ Binary = true;
+ break;
+ case TargetMachine::DynamicLibrary:
+ OutputFilename += LTDL_SHLIB_EXT;
+ Binary = true;
+ break;
+ }
+
+ if (!Force && std::ifstream(OutputFilename.c_str())) {
+ // If force is not specified, make sure not to overwrite a file!
+ std::cerr << ProgName << ": error opening '" << OutputFilename
+ << "': file exists!\n"
+ << "Use -f command line argument to force output\n";
+ return 0;
+ }
+
+ // 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_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), Binary, error);
+ if (!error.empty()) {
+ std::cerr << error << '\n';
+ delete Out;
+ return 0;
+ }
+
+ return Out;
+}
// main - Entry point for the llc compiler.
//
int main(int argc, char **argv) {
- try {
- cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
- sys::PrintStackTraceOnErrorSignal();
-
- // 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";
+ sys::PrintStackTraceOnErrorSignal();
+ PrettyStackTraceProgram X(argc, argv);
+ llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
+ cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
+
+ // Load the module to be compiled...
+ std::string ErrorMessage;
+ std::auto_ptr<Module> M;
+
+ std::auto_ptr<MemoryBuffer> Buffer(
+ MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage));
+ if (Buffer.get())
+ M.reset(ParseBitcodeFile(Buffer.get(), &ErrorMessage));
+ if (M.get() == 0) {
+ std::cerr << argv[0] << ": bitcode didn't read correctly.\n";
+ std::cerr << "Reason: " << ErrorMessage << "\n";
+ return 1;
+ }
+ Module &mod = *M.get();
+
+ // If we are supposed to override the target triple, do so now.
+ if (!TargetTriple.empty())
+ mod.setTargetTriple(TargetTriple);
+
+ // Allocate target machine. First, check whether the user has
+ // explicitly specified an architecture to compile for.
+ if (MArch == 0) {
+ std::string Err;
+ MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
+ if (MArch == 0) {
+ std::cerr << argv[0] << ": error auto-selecting target for module '"
+ << Err << "'. Please use the -march option to explicitly "
+ << "pick a target.\n";
return 1;
}
- Module &mod = *M.get();
+ }
- // Allocate target machine. First, check whether the user has
- // explicitly specified an architecture to compile for.
- TargetMachine* (*TargetMachineAllocator)(const Module&,
- IntrinsicLowering *) = 0;
- if (MArch == 0) {
- std::string Err;
- MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
- if (MArch == 0) {
- std::cerr << 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(MArch->CtorFn(mod, FeaturesStr));
+ assert(target.get() && "Could not allocate target machine!");
+ TargetMachine &Target = *target.get();
+
+ // Figure out where we are going to send the output...
+ raw_ostream *Out = GetOutputStream(argv[0]);
+ if (Out == 0) return 1;
+
+ CodeGenOpt::Level OLvl = CodeGenOpt::Default;
+ switch (OptLevel) {
+ default:
+ std::cerr << argv[0] << ": invalid optimization level.\n";
+ return 1;
+ case ' ': break;
+ case '0': OLvl = CodeGenOpt::None; break;
+ case '1':
+ case '2': OLvl = CodeGenOpt::Default; break;
+ case '3': OLvl = CodeGenOpt::Aggressive; break;
+ }
+
+ // If this target requires addPassesToEmitWholeFile, do it now. This is
+ // used by strange things like the C backend.
+ if (Target.WantsWholeFile()) {
+ PassManager PM;
+ PM.add(new TargetData(*Target.getTargetData()));
+ if (!NoVerify)
+ PM.add(createVerifierPass());
+
+ // Ask the target to add backend passes as necessary.
+ if (Target.addPassesToEmitWholeFile(PM, *Out, FileType, OLvl)) {
+ std::cerr << argv[0] << ": target does not support generation of this"
+ << " file type!\n";
+ if (Out != &outs()) delete Out;
+ // And the Out file is empty and useless, so remove it now.
+ sys::Path(OutputFilename).eraseFromDisk();
+ return 1;
}
+ PM.run(mod);
+ } else {
+ // Build up all of the passes that we want to do to the module.
+ ExistingModuleProvider Provider(M.release());
+ FunctionPassManager Passes(&Provider);
+ Passes.add(new TargetData(*Target.getTargetData()));
- std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, 0));
- assert(target.get() && "Could not allocate target machine!");
- TargetMachine &Target = *target.get();
- const TargetData &TD = Target.getTargetData();
-
- // 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()));
-
- // Figure out where we are going to send the output...
- std::ostream *Out = 0;
- if (OutputFilename != "") {
- 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 unlinked from the disk if we get a
- // SIGINT
- sys::RemoveFileOnSignal(sys::Path(OutputFilename));
- } else {
- Out = &std::cout;
- }
- } else {
- if (InputFilename == "-") {
- OutputFilename = "-";
- Out = &std::cout;
- } else {
- OutputFilename = GetFileNameRoot(InputFilename);
-
- if (MArch->Name[0] != 'c' || MArch->Name[1] != 0) // not CBE
- OutputFilename += ".s";
- else
- OutputFilename += ".cbe.c";
-
- 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 unlinked from the disk if we get a
- // SIGINT
- sys::RemoveFileOnSignal(sys::Path(OutputFilename));
- }
+#ifndef NDEBUG
+ if (!NoVerify)
+ Passes.add(createVerifierPass());
+#endif
+
+ // Ask the target to add backend passes as necessary.
+ MachineCodeEmitter *MCE = 0;
+
+ // Override default to generate verbose assembly.
+ Target.setAsmVerbosityDefault(true);
+
+ switch (Target.addPassesToEmitFile(Passes, *Out, FileType, OLvl)) {
+ default:
+ assert(0 && "Invalid file model!");
+ return 1;
+ case FileModel::Error:
+ std::cerr << argv[0] << ": target does not support generation of this"
+ << " file type!\n";
+ if (Out != &outs()) delete Out;
+ // And the Out file is empty and useless, so remove it now.
+ sys::Path(OutputFilename).eraseFromDisk();
+ return 1;
+ case FileModel::AsmFile:
+ break;
+ case FileModel::MachOFile:
+ MCE = AddMachOWriter(Passes, *Out, Target);
+ break;
+ case FileModel::ElfFile:
+ MCE = AddELFWriter(Passes, *Out, Target);
+ break;
}
- // Ask the target to add backend passes as necessary
- if (Target.addPassesToEmitAssembly(Passes, *Out)) {
- std::cerr << argv[0] << ": target '" << Target.getName()
- << "' does not support static compilation!\n";
- if (Out != &std::cout) delete Out;
+ if (Target.addPassesToEmitFileFinish(Passes, MCE, OLvl)) {
+ std::cerr << argv[0] << ": target does not support generation of this"
+ << " file type!\n";
+ if (Out != &outs()) delete Out;
// And the Out file is empty and useless, so remove it now.
- std::remove(OutputFilename.c_str());
+ sys::Path(OutputFilename).eraseFromDisk();
return 1;
- } 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;
+ Passes.doInitialization();
- return 0;
- } catch (const std::string& msg) {
- std::cerr << argv[0] << ": " << msg << "\n";
- } catch (...) {
- std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+ // Run our queue of passes all at once now, efficiently.
+ // TODO: this could lazily stream functions out of the module.
+ for (Module::iterator I = mod.begin(), E = mod.end(); I != E; ++I)
+ if (!I->isDeclaration()) {
+ if (DisableRedZone)
+ I->addFnAttr(Attribute::NoRedZone);
+ if (NoImplicitFloats)
+ I->addFnAttr(Attribute::NoImplicitFloat);
+ Passes.run(*I);
+ }
+
+ Passes.doFinalization();
}
- return 1;
+
+ // Delete the ostream if it's not a stdout stream
+ if (Out != &outs()) delete Out;
+
+ return 0;
}
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