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Diffstat (limited to 'contrib/llvm/tools/lli/lli.cpp')
-rw-r--r-- | contrib/llvm/tools/lli/lli.cpp | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/contrib/llvm/tools/lli/lli.cpp b/contrib/llvm/tools/lli/lli.cpp new file mode 100644 index 0000000..efcc1f5 --- /dev/null +++ b/contrib/llvm/tools/lli/lli.cpp @@ -0,0 +1,315 @@ +//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This utility provides a simple wrapper around the LLVM Execution Engines, +// which allow the direct execution of LLVM programs through a Just-In-Time +// compiler, or through an interpreter if no JIT is available for this platform. +// +//===----------------------------------------------------------------------===// + +#include "llvm/LLVMContext.h" +#include "llvm/Module.h" +#include "llvm/Type.h" +#include "llvm/ADT/Triple.h" +#include "llvm/Bitcode/ReaderWriter.h" +#include "llvm/CodeGen/LinkAllCodegenComponents.h" +#include "llvm/ExecutionEngine/GenericValue.h" +#include "llvm/ExecutionEngine/Interpreter.h" +#include "llvm/ExecutionEngine/JIT.h" +#include "llvm/ExecutionEngine/JITEventListener.h" +#include "llvm/ExecutionEngine/JITMemoryManager.h" +#include "llvm/ExecutionEngine/MCJIT.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/IRReader.h" +#include "llvm/Support/ManagedStatic.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/PluginLoader.h" +#include "llvm/Support/PrettyStackTrace.h" +#include "llvm/Support/raw_ostream.h" +#include "llvm/Support/Process.h" +#include "llvm/Support/Signals.h" +#include "llvm/Support/TargetSelect.h" +#include <cerrno> + +#ifdef __CYGWIN__ +#include <cygwin/version.h> +#if defined(CYGWIN_VERSION_DLL_MAJOR) && CYGWIN_VERSION_DLL_MAJOR<1007 +#define DO_NOTHING_ATEXIT 1 +#endif +#endif + +using namespace llvm; + +namespace { + cl::opt<std::string> + InputFile(cl::desc("<input bitcode>"), cl::Positional, cl::init("-")); + + cl::list<std::string> + InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>...")); + + cl::opt<bool> ForceInterpreter("force-interpreter", + cl::desc("Force interpretation: disable JIT"), + cl::init(false)); + + cl::opt<bool> UseMCJIT( + "use-mcjit", cl::desc("Enable use of the MC-based JIT (if available)"), + cl::init(false)); + + // Determine optimization level. + cl::opt<char> + OptLevel("O", + cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " + "(default = '-O2')"), + cl::Prefix, + cl::ZeroOrMore, + cl::init(' ')); + + cl::opt<std::string> + TargetTriple("mtriple", cl::desc("Override target triple for module")); + + cl::opt<std::string> + MArch("march", + cl::desc("Architecture to generate assembly for (see --version)")); + + cl::opt<std::string> + MCPU("mcpu", + cl::desc("Target a specific cpu type (-mcpu=help for details)"), + cl::value_desc("cpu-name"), + cl::init("")); + + 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<std::string> + EntryFunc("entry-function", + cl::desc("Specify the entry function (default = 'main') " + "of the executable"), + cl::value_desc("function"), + cl::init("main")); + + cl::opt<std::string> + FakeArgv0("fake-argv0", + cl::desc("Override the 'argv[0]' value passed into the executing" + " program"), cl::value_desc("executable")); + + cl::opt<bool> + DisableCoreFiles("disable-core-files", cl::Hidden, + cl::desc("Disable emission of core files if possible")); + + cl::opt<bool> + NoLazyCompilation("disable-lazy-compilation", + cl::desc("Disable JIT lazy compilation"), + cl::init(false)); + + cl::opt<Reloc::Model> + RelocModel("relocation-model", + cl::desc("Choose relocation model"), + cl::init(Reloc::Default), + cl::values( + clEnumValN(Reloc::Default, "default", + "Target default relocation model"), + clEnumValN(Reloc::Static, "static", + "Non-relocatable code"), + clEnumValN(Reloc::PIC_, "pic", + "Fully relocatable, position independent code"), + clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", + "Relocatable external references, non-relocatable code"), + clEnumValEnd)); + + cl::opt<llvm::CodeModel::Model> + CMModel("code-model", + cl::desc("Choose code model"), + cl::init(CodeModel::JITDefault), + cl::values(clEnumValN(CodeModel::JITDefault, "default", + "Target default JIT code model"), + clEnumValN(CodeModel::Small, "small", + "Small code model"), + clEnumValN(CodeModel::Kernel, "kernel", + "Kernel code model"), + clEnumValN(CodeModel::Medium, "medium", + "Medium code model"), + clEnumValN(CodeModel::Large, "large", + "Large code model"), + clEnumValEnd)); + +} + +static ExecutionEngine *EE = 0; + +static void do_shutdown() { + // Cygwin-1.5 invokes DLL's dtors before atexit handler. +#ifndef DO_NOTHING_ATEXIT + delete EE; + llvm_shutdown(); +#endif +} + +//===----------------------------------------------------------------------===// +// main Driver function +// +int main(int argc, char **argv, char * const *envp) { + sys::PrintStackTraceOnErrorSignal(); + PrettyStackTraceProgram X(argc, argv); + + LLVMContext &Context = getGlobalContext(); + atexit(do_shutdown); // Call llvm_shutdown() on exit. + + // If we have a native target, initialize it to ensure it is linked in and + // usable by the JIT. + InitializeNativeTarget(); + InitializeNativeTargetAsmPrinter(); + + cl::ParseCommandLineOptions(argc, argv, + "llvm interpreter & dynamic compiler\n"); + + // If the user doesn't want core files, disable them. + if (DisableCoreFiles) + sys::Process::PreventCoreFiles(); + + // Load the bitcode... + SMDiagnostic Err; + Module *Mod = ParseIRFile(InputFile, Err, Context); + if (!Mod) { + Err.print(argv[0], errs()); + return 1; + } + + // If not jitting lazily, load the whole bitcode file eagerly too. + std::string ErrorMsg; + if (NoLazyCompilation) { + if (Mod->MaterializeAllPermanently(&ErrorMsg)) { + errs() << argv[0] << ": bitcode didn't read correctly.\n"; + errs() << "Reason: " << ErrorMsg << "\n"; + exit(1); + } + } + + EngineBuilder builder(Mod); + builder.setMArch(MArch); + builder.setMCPU(MCPU); + builder.setMAttrs(MAttrs); + builder.setRelocationModel(RelocModel); + builder.setCodeModel(CMModel); + builder.setErrorStr(&ErrorMsg); + builder.setJITMemoryManager(ForceInterpreter ? 0 : + JITMemoryManager::CreateDefaultMemManager()); + builder.setEngineKind(ForceInterpreter + ? EngineKind::Interpreter + : EngineKind::JIT); + + // If we are supposed to override the target triple, do so now. + if (!TargetTriple.empty()) + Mod->setTargetTriple(Triple::normalize(TargetTriple)); + + // Enable MCJIT if desired. + if (UseMCJIT && !ForceInterpreter) { + builder.setUseMCJIT(true); + builder.setJITMemoryManager(JITMemoryManager::CreateDefaultMemManager()); + } + + 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; + } + builder.setOptLevel(OLvl); + + EE = builder.create(); + if (!EE) { + if (!ErrorMsg.empty()) + errs() << argv[0] << ": error creating EE: " << ErrorMsg << "\n"; + else + errs() << argv[0] << ": unknown error creating EE!\n"; + exit(1); + } + + // The following functions have no effect if their respective profiling + // support wasn't enabled in the build configuration. + EE->RegisterJITEventListener( + JITEventListener::createOProfileJITEventListener()); + EE->RegisterJITEventListener( + JITEventListener::createIntelJITEventListener()); + + EE->DisableLazyCompilation(NoLazyCompilation); + + // If the user specifically requested an argv[0] to pass into the program, + // do it now. + if (!FakeArgv0.empty()) { + InputFile = FakeArgv0; + } else { + // Otherwise, if there is a .bc suffix on the executable strip it off, it + // might confuse the program. + if (StringRef(InputFile).endswith(".bc")) + InputFile.erase(InputFile.length() - 3); + } + + // Add the module's name to the start of the vector of arguments to main(). + InputArgv.insert(InputArgv.begin(), InputFile); + + // Call the main function from M as if its signature were: + // int main (int argc, char **argv, const char **envp) + // using the contents of Args to determine argc & argv, and the contents of + // EnvVars to determine envp. + // + Function *EntryFn = Mod->getFunction(EntryFunc); + if (!EntryFn) { + errs() << '\'' << EntryFunc << "\' function not found in module.\n"; + return -1; + } + + // If the program doesn't explicitly call exit, we will need the Exit + // function later on to make an explicit call, so get the function now. + Constant *Exit = Mod->getOrInsertFunction("exit", Type::getVoidTy(Context), + Type::getInt32Ty(Context), + NULL); + + // Reset errno to zero on entry to main. + errno = 0; + + // Run static constructors. + EE->runStaticConstructorsDestructors(false); + + if (NoLazyCompilation) { + for (Module::iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) { + Function *Fn = &*I; + if (Fn != EntryFn && !Fn->isDeclaration()) + EE->getPointerToFunction(Fn); + } + } + + // Run main. + int Result = EE->runFunctionAsMain(EntryFn, InputArgv, envp); + + // Run static destructors. + EE->runStaticConstructorsDestructors(true); + + // If the program didn't call exit explicitly, we should call it now. + // This ensures that any atexit handlers get called correctly. + if (Function *ExitF = dyn_cast<Function>(Exit)) { + std::vector<GenericValue> Args; + GenericValue ResultGV; + ResultGV.IntVal = APInt(32, Result); + Args.push_back(ResultGV); + EE->runFunction(ExitF, Args); + errs() << "ERROR: exit(" << Result << ") returned!\n"; + abort(); + } else { + errs() << "ERROR: exit defined with wrong prototype!\n"; + abort(); + } +} |