X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=tools%2Flli%2Flli.cpp;h=e3809538a57323e0ad3eda497586360c04260908;hb=c1e6d686986f511774e0f46e21d4cd90f734bed1;hp=29d45d68306191aadf8fbd61aa513abd6231f169;hpb=204eec3f57aedd703fb73db78ac2b4087caf9f07;p=oota-llvm.git diff --git a/tools/lli/lli.cpp b/tools/lli/lli.cpp index 29d45d68306..e3809538a57 100644 --- a/tools/lli/lli.cpp +++ b/tools/lli/lli.cpp @@ -1,64 +1,174 @@ +//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===// +// +// 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. +// //===----------------------------------------------------------------------===// -// LLVM INTERPRETER/DEBUGGER/PROFILER UTILITY // -// This utility is an interactive frontend to almost all other LLVM -// functionality. It may be used as an interpreter to run code, a debugger to -// find problems, or a profiler to analyze execution frequencies. +// 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 "Interpreter.h" +#include "llvm/Module.h" +#include "llvm/ModuleProvider.h" +#include "llvm/Type.h" +#include "llvm/Bitcode/ReaderWriter.h" +#include "llvm/Bytecode/Reader.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/Compressor.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; -cl::StringList InputArgv("" , "Input command line", cl::ConsumeAfter); -cl::String MainFunction ("f" , "Function to execute", cl::NoFlags, "main"); -cl::Flag DebugMode ("debug" , "Start program in debugger"); -cl::Alias DebugModeA ("d" , "Alias for -debug", cl::NoFlags, DebugMode); -cl::Flag ProfileMode ("profile", "Enable Profiling [unimp]"); +namespace { + cl::opt Bitcode("bitcode"); -//===----------------------------------------------------------------------===// -// Interpreter ctor - Initialize stuff -// -Interpreter::Interpreter() : ExitCode(0), Profile(ProfileMode), CurFrame(-1) { - CurMod = 0; - loadModule(InputArgv.size() ? InputArgv[0] : ""); + cl::opt + InputFile(cl::desc(""), cl::Positional, cl::init("-")); + + cl::list + InputArgv(cl::ConsumeAfter, cl::desc("...")); + + cl::opt ForceInterpreter("force-interpreter", + 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")); +} + +static ExecutionEngine *EE = 0; - // Initialize the "backend" - initializeExecutionEngine(); +static void do_shutdown() { + delete EE; + llvm_shutdown(); } //===----------------------------------------------------------------------===// // main Driver function // -int main(int argc, char** argv) { - cl::ParseCommandLineOptions(argc, argv, " llvm interpreter\n"); +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"); + sys::PrintStackTraceOnErrorSignal(); - // Create the interpreter... - Interpreter I; + // If the user doesn't want core files, disable them. + if (DisableCoreFiles) + sys::Process::PreventCoreFiles(); + + // Load the bytecode... + std::string ErrorMsg; + ModuleProvider *MP = 0; + if (Bitcode) { + MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(&InputFile[0], + InputFile.size()); + if (Buffer == 0) + ErrorMsg = "Error reading file '" + InputFile + "'"; + else { + MP = getBitcodeModuleProvider(Buffer, &ErrorMsg); + if (!MP) delete Buffer; + } + } else { + MP = getBytecodeModuleProvider(InputFile, + Compressor::decompressToNewBuffer, + &ErrorMsg); + } + + if (!MP) { + std::cerr << argv[0] << ": error loading program '" << InputFile << "': " + << ErrorMsg << "\n"; + exit(1); + } - // Handle alternate names of the program. If started as llp, enable profiling - // if started as ldb, enable debugging... - // - if (argv[0] == "ldb") // TODO: Obviously incorrect, but you get the idea - DebugMode = true; - else if (argv[0] == "llp") - ProfileMode = true; + // Get the module as the MP could go away once EE takes over. + Module *Mod = MP->getModule(); + + // 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); + } + + // 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); + } - // If running with the profiler, enable it now... - if (ProfileMode) I.enableProfiling(); + // Add the module's name to the start of the vector of arguments to main(). + InputArgv.insert(InputArgv.begin(), InputFile); - // Start interpreter into the main function... + // 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. // - if (!I.callMainMethod(MainFunction, InputArgv) && !DebugMode) { - // If not in debug mode and if the call succeeded, run the code now... - I.run(); + Function *Fn = Mod->getFunction("main"); + if (!Fn) { + std::cerr << "'main' function not found in module.\n"; + return -1; } - // If debug mode, allow the user to interact... also, if the user pressed - // ctrl-c or execution hit an error, enter the event loop... - if (DebugMode || I.isStopped()) - I.handleUserInput(); + // 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); + + // Run main. + int Result = EE->runFunctionAsMain(Fn, InputArgv, envp); - // Return the status code of the program executed... - return I.getExitCode(); + // 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(); + } }