-//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
+//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
//
-// This is the llc compiler driver.
+// 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/Bytecode/Reader.h"
-#include "llvm/Target/Sparc.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/Transforms/Instrumentation/TraceValues.h"
+#include "llvm/Target/TargetMachineRegistry.h"
#include "llvm/Transforms/Scalar.h"
-#include "llvm/Transforms/Utils/Linker.h"
-#include "llvm/Assembly/PrintModulePass.h"
-#include "llvm/Bytecode/WriteBytecodePass.h"
-#include "llvm/Transforms/IPO.h"
#include "llvm/Module.h"
-#include "llvm/Function.h"
+#include "llvm/ModuleProvider.h"
#include "llvm/PassManager.h"
-#include "Support/CommandLine.h"
-#include "Support/Signals.h"
-#include <memory>
+#include "llvm/Pass.h"
+#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>
-using std::string;
-using std::cerr;
+#include <iostream>
+#include <memory>
+using namespace llvm;
-static cl::opt<string>
-InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
+// 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<string>
+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<bool>
-DumpAsm("d", cl::desc("Print bytecode before native code generation"),
- cl::Hidden);
-
-static cl::opt<string>
-TraceLibPath("tracelibpath", cl::desc("Path to libinstr for trace code"),
- cl::value_desc("directory"), cl::Hidden);
-
-enum TraceLevel {
- TraceOff, TraceFunctions, TraceBasicBlocks
-};
-
-static cl::opt<TraceLevel>
-TraceValues("trace", cl::desc("Trace values through functions or basic blocks"),
- cl::values(
- clEnumValN(TraceOff , "off", "Disable trace code"),
- clEnumValN(TraceFunctions , "function", "Trace each function"),
- clEnumValN(TraceBasicBlocks, "basicblock", "Trace each basic block"),
- 0));
-
-// GetFileNameRoot - Helper function to get the basename of a filename...
-static inline string GetFileNameRoot(const string &InputFilename) {
- string IFN = InputFilename;
- string outputFilename;
+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,
+ TargetMachineRegistry::Parser>
+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"));
+
+
+// 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 (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
- outputFilename = string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
+ 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 void insertTraceCodeFor(Module &M) {
- PassManager Passes;
+static std::ostream *GetOutputStream(const char *ProgName) {
+ if (OutputFilename != "") {
+ if (OutputFilename == "-")
+ return &std::cout;
- // Insert trace code in all functions in the module
- switch (TraceValues) {
- case TraceBasicBlocks:
- Passes.add(createTraceValuesPassForBasicBlocks());
+ // 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') {
+ 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 TraceFunctions:
- Passes.add(createTraceValuesPassForFunction());
+ case TargetMachine::ObjectFile:
+ OutputFilename += ".o";
+ break;
+ case TargetMachine::DynamicLibrary:
+ OutputFilename += LTDL_SHLIB_EXT;
break;
- default:
- assert(0 && "Bad value for TraceValues!");
- abort();
}
- // Eliminate duplication in constant pool
- Passes.add(createConstantMergePass());
-
- // Run passes to insert and clean up trace code...
- Passes.run(M);
-
- std::string ErrorMessage;
-
- // Load the module that contains the runtime helper routines neccesary for
- // pointer hashing and stuff... link this module into the program if possible
- //
- Module *TraceModule = ParseBytecodeFile(TraceLibPath+"libinstr.bc");
-
- // Ok, the TraceLibPath didn't contain a valid module. Try to load the module
- // from the current LLVM-GCC install directory. This is kindof a hack, but
- // allows people to not HAVE to have built the library.
- //
- if (TraceModule == 0)
- TraceModule = ParseBytecodeFile("/home/vadve/lattner/cvs/gcc_install/lib/"
- "gcc-lib/llvm/3.1/libinstr.bc");
-
- // If we still didn't get it, cancel trying to link it in...
- if (TraceModule == 0) {
- cerr << "Warning, could not load trace routines to link into program!\n";
- } else {
-
- // Link in the trace routines... if the link fails, don't panic, because the
- // compile should still succeed, just the native linker will probably fail.
- //
- std::auto_ptr<Module> TraceRoutines(TraceModule);
- if (LinkModules(&M, TraceRoutines.get(), &ErrorMessage))
- cerr << "Warning: Error linking in trace routines: "
- << ErrorMessage << "\n";
+ 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;
}
-
-
- // Write out the module with tracing code just before code generation
- if (InputFilename != "-") {
- string TraceFilename = GetFileNameRoot(InputFilename) + ".trace.bc";
-
- std::ofstream Out(TraceFilename.c_str());
- if (!Out.good()) {
- cerr << "Error opening '" << TraceFilename
- << "'!: Skipping output of trace code as bytecode\n";
- } else {
- cerr << "Emitting trace code to '" << TraceFilename
- << "' for comparison...\n";
- WriteBytecodeToFile(&M, Out);
- }
+
+ // 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;
+}
-//===---------------------------------------------------------------------===//
-// Function main()
-//
-// Entry point for the llc compiler.
-//===---------------------------------------------------------------------===//
-
+// main - Entry point for the llc compiler.
+//
int main(int argc, char **argv) {
- cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
-
- // Allocate a target... in the future this will be controllable on the
- // command line.
- std::auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
- assert(target.get() && "Could not allocate target machine!");
+ llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
+ cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
+ sys::PrintStackTraceOnErrorSignal();
- TargetMachine &Target = *target.get();
-
// 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) {
- 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;
}
-
- if (TraceValues != TraceOff) // If tracing enabled...
- insertTraceCodeFor(*M.get()); // Hack up module before using passmanager...
-
- // Build up all of the passes that we want to do to the module...
- PassManager Passes;
-
- // Decompose multi-dimensional refs into a sequence of 1D refs
- Passes.add(createDecomposeMultiDimRefsPass());
+ Module &mod = *M.get();
- // Replace malloc and free instructions with library calls.
- // Do this after tracing until lli implements these lib calls.
- // For now, it will emulate malloc and free internally.
- Passes.add(createLowerAllocationsPass(Target.DataLayout));
+ // If we are supposed to override the target triple, do so now.
+ if (!TargetTriple.empty())
+ mod.setTargetTriple(TargetTriple);
- // If LLVM dumping after transformations is requested, add it to the pipeline
- if (DumpAsm)
- Passes.add(new PrintFunctionPass("Code after xformations: \n", &cerr));
+ // 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;
+ }
+ }
- // Strip all of the symbols from the bytecode so that it will be smaller...
- Passes.add(createSymbolStrippingPass());
+ // 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...
- std::ostream *Out = 0;
- 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!
- cerr << argv[0] << ": error opening '" << OutputFilename
- << "': file exists!\n"
- << "Use -f command line argument to force output\n";
+ 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;
}
- 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);
+ PM.run(mod);
} else {
- if (InputFilename == "-") {
- OutputFilename = "-";
- Out = &std::cout;
- } else {
- string OutputFilename = GetFileNameRoot(InputFilename);
- OutputFilename += ".s";
+ // 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()));
+
+#ifndef NDEBUG
+ if (!NoVerify)
+ Passes.add(createVerifierPass());
+#endif
+
+ // Ask the target to add backend passes as necessary.
+ MachineCodeEmitter *MCE = 0;
- if (!Force && std::ifstream(OutputFilename.c_str())) {
- // If force is not specified, make sure not to overwrite a file!
- 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()) {
- 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);
+ 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;
+ }
+
+ 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;
}
- }
- Target.addPassesToEmitAssembly(Passes, *Out);
+ Passes.doInitialization();
- // Run our queue of passes all at once now, efficiently.
- Passes.run(*M.get());
-
+ // 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())
+ Passes.run(*I);
+
+ Passes.doFinalization();
+ }
+
+ // Delete the ostream if it's not a stdout stream
if (Out != &std::cout) delete Out;
return 0;
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