X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=tools%2Flli%2Flli.cpp;h=67b1424d839fa1a5315e0932dded192f84f0d2d4;hb=cb41e6bf52e51b2cbf6871f63785af1c12a5fe70;hp=a69f53c98a720a15e1e028d6790dc3d49091f38f;hpb=6ae73dc98f2b1177b3e1a8c462111deab79c9e4c;p=oota-llvm.git diff --git a/tools/lli/lli.cpp b/tools/lli/lli.cpp index a69f53c98a7..67b1424d839 100644 --- a/tools/lli/lli.cpp +++ b/tools/lli/lli.cpp @@ -1,106 +1,182 @@ //===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===// // -// This utility provides a way to execute LLVM bytecode without static -// compilation. This consists of a very simple and slow (but portable) -// interpreter, along with capability for system specific dynamic compilers. At -// runtime, the fastest (stable) execution engine is selected to run the -// program. This means the JIT compiler for the current platform if it's -// available. +// 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 intepreter if no JIT is available for this platform. // //===----------------------------------------------------------------------===// -#include "ExecutionEngine.h" -#include "Support/CommandLine.h" -#include "llvm/Bytecode/Reader.h" #include "llvm/Module.h" -#include "llvm/Target/TargetMachineImpls.h" +#include "llvm/ModuleProvider.h" +#include "llvm/Type.h" +#include "llvm/Bitcode/ReaderWriter.h" +#include "llvm/CodeGen/LinkAllCodegenComponents.h" +#include "llvm/ExecutionEngine/JIT.h" +#include "llvm/ExecutionEngine/Interpreter.h" +#include "llvm/ExecutionEngine/GenericValue.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/ManagedStatic.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/PluginLoader.h" +#include "llvm/System/Process.h" +#include "llvm/System/Signals.h" +#include +#include +using namespace llvm; namespace { cl::opt - InputFile(cl::desc(""), cl::Positional, cl::init("-")); + InputFile(cl::desc(""), cl::Positional, cl::init("-")); cl::list InputArgv(cl::ConsumeAfter, cl::desc("...")); - cl::opt - MainFunction ("f", cl::desc("Function to execute"), cl::init("main"), - cl::value_desc("function name")); - - cl::opt DebugMode("d", cl::desc("Start program in debugger")); - - cl::opt TraceMode("trace", cl::desc("Enable Tracing")); - cl::opt ForceInterpreter("force-interpreter", - cl::desc("Force interpretation: disable JIT"), - cl::init(false)); + cl::desc("Force interpretation: disable JIT"), + cl::init(false)); + cl::opt + TargetTriple("mtriple", cl::desc("Override target triple for module")); + + cl::opt + FakeArgv0("fake-argv0", + cl::desc("Override the 'argv[0]' value passed into the executing" + " program"), cl::value_desc("executable")); + + cl::opt + DisableCoreFiles("disable-core-files", cl::Hidden, + cl::desc("Disable emission of core files if possible")); + + cl::opt + NoLazyCompilation("disable-lazy-compilation", + cl::desc("Disable JIT lazy compilation"), + cl::init(false)); } -//===----------------------------------------------------------------------===// -// ExecutionEngine Class Implementation -// +static ExecutionEngine *EE = 0; -ExecutionEngine::~ExecutionEngine() { - delete &CurMod; +static void do_shutdown() { + delete EE; + llvm_shutdown(); } //===----------------------------------------------------------------------===// // main Driver function // -int main(int argc, char** argv) { +int main(int argc, char **argv, char * const *envp) { + atexit(do_shutdown); // Call llvm_shutdown() on exit. cl::ParseCommandLineOptions(argc, argv, - " llvm interpreter & dynamic compiler\n"); - - // Load the bytecode... + "llvm interpreter & dynamic compiler\n"); + sys::PrintStackTraceOnErrorSignal(); + + // If the user doesn't want core files, disable them. + if (DisableCoreFiles) + sys::Process::PreventCoreFiles(); + + // Load the bitcode... std::string ErrorMsg; - Module *M = ParseBytecodeFile(InputFile, &ErrorMsg); - if (M == 0) { - std::cout << "Error parsing '" << InputFile << "': " + ModuleProvider *MP = NULL; + if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFile,&ErrorMsg)) { + MP = getBitcodeModuleProvider(Buffer, &ErrorMsg); + if (!MP) delete Buffer; + } + + if (!MP) { + std::cerr << argv[0] << ": error loading program '" << InputFile << "': " << ErrorMsg << "\n"; exit(1); } -#if 0 - // Link in the runtime library for LLI... - std::string RuntimeLib = getCurrentExecutablePath(); - if (!RuntimeLib.empty()) RuntimeLib += "/"; - RuntimeLib += "RuntimeLib.bc"; + // Get the module as the MP could go away once EE takes over. + Module *Mod = NoLazyCompilation + ? MP->materializeModule(&ErrorMsg) : MP->getModule(); + if (!Mod) { + std::cerr << argv[0] << ": bitcode didn't read correctly.\n"; + std::cerr << "Reason: " << ErrorMsg << "\n"; + exit(1); + } - if (Module *SupportLib = ParseBytecodeFile(RuntimeLib, &ErrorMsg)) { - if (LinkModules(M, SupportLib, &ErrorMsg)) - std::cerr << "Error Linking runtime library into current module: " - << ErrorMsg << "\n"; - } else { - std::cerr << "Error loading runtime library '"+RuntimeLib+"': " - << ErrorMsg << "\n"; + // If we are supposed to override the target triple, do so now. + if (!TargetTriple.empty()) + Mod->setTargetTriple(TargetTriple); + + EE = ExecutionEngine::create(MP, ForceInterpreter, &ErrorMsg); + if (!EE && !ErrorMsg.empty()) { + std::cerr << argv[0] << ":error creating EE: " << ErrorMsg << "\n"; + exit(1); } -#endif - - unsigned Config = (M->isLittleEndian() ? TM::LittleEndian : TM::BigEndian) | - (M->has32BitPointers() ? TM::PtrSize32 : TM::PtrSize64); - ExecutionEngine *EE = 0; - - // If there is nothing that is forcing us to use the interpreter, make a JIT. - if (!ForceInterpreter && !DebugMode && !TraceMode) - EE = ExecutionEngine::createJIT(M, Config); - - // If we can't make a JIT, make an interpreter instead. - if (EE == 0) - EE = ExecutionEngine::createInterpreter(M, Config, DebugMode, TraceMode); - - // Add the module name to the start of the argv vector... - // But delete .bc first, since programs (and users) might not expect to - // see it. - const std::string ByteCodeFileSuffix (".bc"); - if (InputFile.rfind (ByteCodeFileSuffix) == - InputFile.length () - ByteCodeFileSuffix.length ()) { - InputFile.erase (InputFile.length () - ByteCodeFileSuffix.length ()); + + if (NoLazyCompilation) + EE->DisableLazyCompilation(); + + // 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 (InputFile.rfind(".bc") == InputFile.length() - 3) + 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); - // Run the main function! - int ExitCode = EE->run(MainFunction, InputArgv); + // 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 *MainFn = Mod->getFunction("main"); + if (!MainFn) { + std::cerr << "'main' function not found in module.\n"; + return -1; + } - // Now that we are done executing the program, shut down the execution engine - delete EE; - return ExitCode; + // 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::VoidTy, + Type::Int32Ty, 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 != MainFn && !Fn->isDeclaration()) + EE->getPointerToFunction(Fn); + } + } + + // Run main. + int Result = EE->runFunctionAsMain(MainFn, 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(Exit)) { + std::vector Args; + GenericValue ResultGV; + ResultGV.IntVal = APInt(32, Result); + Args.push_back(ResultGV); + EE->runFunction(ExitF, Args); + std::cerr << "ERROR: exit(" << Result << ") returned!\n"; + abort(); + } else { + std::cerr << "ERROR: exit defined with wrong prototype!\n"; + abort(); + } }