//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
//
-// This is the llc 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 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/Bytecode/Reader.h"
-#include "llvm/Target/TargetMachineImpls.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/CodeGen/FileWriters.h"
+#include "llvm/CodeGen/LinkAllCodegenComponents.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 "Support/CommandLine.h"
-#include "Support/Signals.h"
-#include <memory>
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/System/Signals.h"
+#include "llvm/Config/config.h"
+#include "llvm/LinkAllVMCore.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"));
-enum ArchName { noarch, x86, Sparc };
+static cl::opt<bool> Fast("fast",
+ cl::desc("Generate code quickly, potentially sacrificing code quality"));
+
+static cl::opt<std::string>
+TargetTriple("mtriple", cl::desc("Override target triple for module"));
+
+static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
+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::opt<ArchName>
-Arch("march", cl::desc("Architecture to generate assembly for:"), cl::Prefix,
- cl::values(clEnumVal(x86, " IA-32 (Pentium and above)"),
- clEnumValN(Sparc, "sparc", " SPARC V9"),
- 0),
- cl::init(noarch));
+static cl::list<std::string>
+MAttrs("mattr",
+ cl::CommaSeparated,
+ cl::desc("Target specific attributes (-mattr=help for details)"),
+ cl::value_desc("a1,+a2,-a3,..."));
-// GetFileNameRoot - Helper function to get the basename of a filename...
+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"));
+
+
+// GetFileNameRoot - Helper function to get the basename of a filename.
static inline std::string
-GetFileNameRoot(const std::string &InputFilename)
-{
+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') {
+ if ((Len > 2) &&
+ 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;
}
+static std::ostream *GetOutputStream(const char *ProgName) {
+ if (OutputFilename != "") {
+ if (OutputFilename == "-")
+ return &std::cout;
+
+ // 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));
+
+ return new std::ofstream(OutputFilename.c_str());
+ }
+
+ if (InputFilename == "-") {
+ OutputFilename = "-";
+ return &std::cout;
+ }
+
+ OutputFilename = GetFileNameRoot(InputFilename);
+
+ switch (FileType) {
+ case TargetMachine::AssemblyFile:
+ if (MArch->Name[0] != 'c' || MArch->Name[1] != 0) // not CBE
+ OutputFilename += ".s";
+ else
+ OutputFilename += ".cbe.c";
+ break;
+ case TargetMachine::ObjectFile:
+ OutputFilename += ".o";
+ break;
+ case TargetMachine::DynamicLibrary:
+ OutputFilename += LTDL_SHLIB_EXT;
+ 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::ostream *Out = new std::ofstream(OutputFilename.c_str());
+ if (!Out->good()) {
+ std::cerr << ProgName << ": error opening " << OutputFilename << "!\n";
+ delete Out;
+ return 0;
+ }
+
+ return Out;
+}
// main - Entry point for the llc compiler.
//
int main(int argc, char **argv) {
- cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
-
+ llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
+ cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
+ sys::PrintStackTraceOnErrorSignal();
+
// Load the module to be compiled...
- std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
+ 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] << ": bytecode didn't read correctly.\n";
+ 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.
- unsigned Config = (mod.isLittleEndian() ? TM::LittleEndian : TM::BigEndian)|
- (mod.has32BitPointers() ? TM::PtrSize32 : TM::PtrSize64);
- TargetMachine* (*TargetMachineAllocator)(unsigned) = 0;
- switch (Arch) {
- case x86:
- TargetMachineAllocator = allocateX86TargetMachine;
- break;
- case Sparc:
- TargetMachineAllocator = allocateSparcTargetMachine;
- break;
- default:
- // Decide what the default target machine should be, by looking at
- // the module. This heuristic (ILP32, LE -> IA32; LP64, BE ->
- // SPARCV9) is kind of gross, but it will work until we have more
- // sophisticated target information to work from.
- if (mod.isLittleEndian() && mod.has32BitPointers()) {
- TargetMachineAllocator = allocateX86TargetMachine;
- } else if (mod.isBigEndian() && mod.has64BitPointers()) {
- TargetMachineAllocator = allocateSparcTargetMachine;
- } else {
- assert(0 && "You must specify -march; I could not guess the default");
- }
- break;
+ 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((*TargetMachineAllocator)(Config));
+
+ std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, FeaturesStr));
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 unlink'd from the disk if we get a
- // SIGINT
- RemoveFileOnSignal(OutputFilename);
- } else {
- Out = &std::cout;
+ std::ostream *Out = GetOutputStream(argv[0]);
+ if (Out == 0) return 1;
+
+ // 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, Fast)) {
+ std::cerr << argv[0] << ": target does not support generation of this"
+ << " file type!\n";
+ if (Out != &std::cout) delete Out;
+ // And the Out file is empty and useless, so remove it now.
+ sys::Path(OutputFilename).eraseFromDisk();
+ return 1;
}
+ PM.run(mod);
} else {
- if (InputFilename == "-") {
- OutputFilename = "-";
- Out = &std::cout;
- } else {
- 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);
+ // Build up all of the passes that we want to do to the module.
+ FunctionPassManager Passes(new ExistingModuleProvider(M.get()));
+ Passes.add(new TargetData(*Target.getTargetData()));
+
+#ifndef NDEBUG
+ if (!NoVerify)
+ Passes.add(createVerifierPass());
+#endif
+
+ // Ask the target to add backend passes as necessary.
+ MachineCodeEmitter *MCE = 0;
+
+ switch (Target.addPassesToEmitFile(Passes, *Out, FileType, Fast)) {
+ 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 != &std::cout) 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;
- // And the Out file is empty and useless, so remove it now.
- std::remove(OutputFilename.c_str());
- return 1;
- } else {
+ if (Target.addPassesToEmitFileFinish(Passes, MCE, Fast)) {
+ std::cerr << argv[0] << ": target does not support generation of this"
+ << " file type!\n";
+ if (Out != &std::cout) delete Out;
+ // And the Out file is empty and useless, so remove it now.
+ sys::Path(OutputFilename).eraseFromDisk();
+ return 1;
+ }
+
+ Passes.doInitialization();
+
// Run our queue of passes all at once now, efficiently.
- Passes.run(*M.get());
+ // 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())
+ Passes.run(*I);
+
+ Passes.doFinalization();
}
-
+
// Delete the ostream if it's not a stdout stream
if (Out != &std::cout) delete Out;
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