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- //===- 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));
- cl::opt<bool>
- EnableJITExceptionHandling("jit-enable-eh",
- cl::desc("Emit exception handling information"),
- cl::init(false));
- cl::opt<bool>
- // In debug builds, make this default to true.
- #ifdef NDEBUG
- #define EMIT_DEBUG false
- #else
- #define EMIT_DEBUG true
- #endif
- EmitJitDebugInfo("jit-emit-debug",
- cl::desc("Emit debug information to debugger"),
- cl::init(EMIT_DEBUG));
- #undef EMIT_DEBUG
- static cl::opt<bool>
- EmitJitDebugInfoToDisk("jit-emit-debug-to-disk",
- cl::Hidden,
- cl::desc("Emit debug info objfiles to disk"),
- cl::init(false));
- }
- 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
- }
- typedef struct {
- int argc;
- char **argv;
- char *const *envp;
- } arg_t;
- void *run(void *arg) {
- int argc = ((arg_t *) arg)->argc;
- char **argv = ((arg_t *) arg)->argv;
- char *const *envp = ((arg_t *) arg)->envp;
- LLVMContext Context;
- // Load the bitcode...
- SMDiagnostic Err;
- Module *Mod = ParseIRFile(InputFile, Err, Context);
- if (!Mod) {
- Err.print(argv[0], errs());
- return (void *)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 (void *)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);
- TargetOptions Options;
- Options.JITExceptionHandling = EnableJITExceptionHandling;
- Options.JITEmitDebugInfo = EmitJitDebugInfo;
- Options.JITEmitDebugInfoToDisk = EmitJitDebugInfoToDisk;
- builder.setTargetOptions(Options);
- 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 (void *)-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();
- }
- }
- //===----------------------------------------------------------------------===//
- // main Driver function
- //
- int main(int argc, char **argv, char * const *envp) {
- sys::PrintStackTraceOnErrorSignal();
- PrettyStackTraceProgram X(argc, argv);
- 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();
- arg_t *aa = new arg_t();
- aa->argc = argc;
- aa->argv = argv;
- aa->envp = envp;
- pthread_t t1, t2;
- void *r1, *r2;
- if(0 != pthread_create(&t1, NULL, &run, aa)) {
- errs() << "Failed to create thread " << strerror(errno) << "\n";
- return 66;
- }
- if(0 != pthread_create(&t2, NULL, &run, aa)) {
- errs() << "Failed to create thread " << strerror(errno) << "\n";
- return 67;
- }
- pthread_join(t1, &r1);
- pthread_join(t2, &r2);
- return (long) r1 | (long) r2;
- }
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