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255 lines
8.1 KiB
C++
255 lines
8.1 KiB
C++
//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This utility provides a simple wrapper around the LLVM Execution Engines,
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// which allow the direct execution of LLVM programs through a Just-In-Time
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// compiler, or through an interpreter if no JIT is available for this platform.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/CodeGen/LinkAllCodegenComponents.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/ExecutionEngine/Interpreter.h"
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#include "llvm/ExecutionEngine/JIT.h"
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#include "llvm/ExecutionEngine/JITEventListener.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PluginLoader.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/System/Process.h"
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#include "llvm/System/Signals.h"
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#include "llvm/Target/TargetSelect.h"
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#include <cerrno>
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using namespace llvm;
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namespace {
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cl::opt<std::string>
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InputFile(cl::desc("<input bitcode>"), cl::Positional, cl::init("-"));
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cl::list<std::string>
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InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
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cl::opt<bool> ForceInterpreter("force-interpreter",
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cl::desc("Force interpretation: disable JIT"),
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cl::init(false));
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// Determine optimization level.
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cl::opt<char>
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OptLevel("O",
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cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
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"(default = '-O2')"),
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cl::Prefix,
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cl::ZeroOrMore,
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cl::init(' '));
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cl::opt<std::string>
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TargetTriple("mtriple", cl::desc("Override target triple for module"));
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cl::opt<std::string>
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MArch("march",
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cl::desc("Architecture to generate assembly for (see --version)"));
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cl::opt<std::string>
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MCPU("mcpu",
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cl::desc("Target a specific cpu type (-mcpu=help for details)"),
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cl::value_desc("cpu-name"),
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cl::init(""));
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cl::list<std::string>
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MAttrs("mattr",
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cl::CommaSeparated,
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cl::desc("Target specific attributes (-mattr=help for details)"),
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cl::value_desc("a1,+a2,-a3,..."));
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cl::opt<std::string>
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EntryFunc("entry-function",
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cl::desc("Specify the entry function (default = 'main') "
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"of the executable"),
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cl::value_desc("function"),
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cl::init("main"));
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cl::opt<std::string>
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FakeArgv0("fake-argv0",
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cl::desc("Override the 'argv[0]' value passed into the executing"
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" program"), cl::value_desc("executable"));
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cl::opt<bool>
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DisableCoreFiles("disable-core-files", cl::Hidden,
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cl::desc("Disable emission of core files if possible"));
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cl::opt<bool>
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NoLazyCompilation("disable-lazy-compilation",
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cl::desc("Disable JIT lazy compilation"),
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cl::init(false));
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}
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static ExecutionEngine *EE = 0;
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static void do_shutdown() {
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delete EE;
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llvm_shutdown();
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}
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//===----------------------------------------------------------------------===//
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// main Driver function
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//
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int main(int argc, char **argv, char * const *envp) {
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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LLVMContext &Context = getGlobalContext();
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atexit(do_shutdown); // Call llvm_shutdown() on exit.
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// If we have a native target, initialize it to ensure it is linked in and
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// usable by the JIT.
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InitializeNativeTarget();
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cl::ParseCommandLineOptions(argc, argv,
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"llvm interpreter & dynamic compiler\n");
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// If the user doesn't want core files, disable them.
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if (DisableCoreFiles)
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sys::Process::PreventCoreFiles();
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// Load the bitcode...
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std::string ErrorMsg;
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Module *Mod = NULL;
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if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFile,&ErrorMsg)){
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Mod = getLazyBitcodeModule(Buffer, Context, &ErrorMsg);
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if (!Mod) delete Buffer;
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}
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if (!Mod) {
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errs() << argv[0] << ": error loading program '" << InputFile << "': "
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<< ErrorMsg << "\n";
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exit(1);
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}
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// If not jitting lazily, load the whole bitcode file eagerly too.
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if (NoLazyCompilation) {
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if (Mod->MaterializeAllPermanently(&ErrorMsg)) {
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errs() << argv[0] << ": bitcode didn't read correctly.\n";
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errs() << "Reason: " << ErrorMsg << "\n";
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exit(1);
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}
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}
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EngineBuilder builder(Mod);
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builder.setMArch(MArch);
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builder.setMCPU(MCPU);
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builder.setMAttrs(MAttrs);
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builder.setErrorStr(&ErrorMsg);
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builder.setEngineKind(ForceInterpreter
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? EngineKind::Interpreter
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: EngineKind::JIT);
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// If we are supposed to override the target triple, do so now.
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if (!TargetTriple.empty())
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Mod->setTargetTriple(Triple::normalize(TargetTriple));
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CodeGenOpt::Level OLvl = CodeGenOpt::Default;
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switch (OptLevel) {
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default:
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errs() << argv[0] << ": invalid optimization level.\n";
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return 1;
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case ' ': break;
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case '0': OLvl = CodeGenOpt::None; break;
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case '1': OLvl = CodeGenOpt::Less; break;
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case '2': OLvl = CodeGenOpt::Default; break;
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case '3': OLvl = CodeGenOpt::Aggressive; break;
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}
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builder.setOptLevel(OLvl);
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EE = builder.create();
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if (!EE) {
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if (!ErrorMsg.empty())
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errs() << argv[0] << ": error creating EE: " << ErrorMsg << "\n";
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else
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errs() << argv[0] << ": unknown error creating EE!\n";
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exit(1);
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}
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EE->RegisterJITEventListener(createOProfileJITEventListener());
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EE->DisableLazyCompilation(NoLazyCompilation);
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// If the user specifically requested an argv[0] to pass into the program,
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// do it now.
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if (!FakeArgv0.empty()) {
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InputFile = FakeArgv0;
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} else {
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// Otherwise, if there is a .bc suffix on the executable strip it off, it
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// might confuse the program.
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if (StringRef(InputFile).endswith(".bc"))
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InputFile.erase(InputFile.length() - 3);
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}
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// Add the module's name to the start of the vector of arguments to main().
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InputArgv.insert(InputArgv.begin(), InputFile);
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// Call the main function from M as if its signature were:
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// int main (int argc, char **argv, const char **envp)
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// using the contents of Args to determine argc & argv, and the contents of
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// EnvVars to determine envp.
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//
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Function *EntryFn = Mod->getFunction(EntryFunc);
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if (!EntryFn) {
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errs() << '\'' << EntryFunc << "\' function not found in module.\n";
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return -1;
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}
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// If the program doesn't explicitly call exit, we will need the Exit
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// function later on to make an explicit call, so get the function now.
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Constant *Exit = Mod->getOrInsertFunction("exit", Type::getVoidTy(Context),
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Type::getInt32Ty(Context),
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NULL);
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// Reset errno to zero on entry to main.
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errno = 0;
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// Run static constructors.
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EE->runStaticConstructorsDestructors(false);
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if (NoLazyCompilation) {
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for (Module::iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) {
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Function *Fn = &*I;
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if (Fn != EntryFn && !Fn->isDeclaration())
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EE->getPointerToFunction(Fn);
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}
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}
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// Run main.
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int Result = EE->runFunctionAsMain(EntryFn, InputArgv, envp);
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// Run static destructors.
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EE->runStaticConstructorsDestructors(true);
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// If the program didn't call exit explicitly, we should call it now.
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// This ensures that any atexit handlers get called correctly.
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if (Function *ExitF = dyn_cast<Function>(Exit)) {
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std::vector<GenericValue> Args;
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GenericValue ResultGV;
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ResultGV.IntVal = APInt(32, Result);
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Args.push_back(ResultGV);
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EE->runFunction(ExitF, Args);
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errs() << "ERROR: exit(" << Result << ") returned!\n";
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abort();
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} else {
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errs() << "ERROR: exit defined with wrong prototype!\n";
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abort();
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}
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}
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