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107 lines
3.7 KiB
C++
107 lines
3.7 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 intepreter if no JIT is available for this platform.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/Type.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "Support/CommandLine.h"
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#include "llvm/System/Signals.h"
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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 bytecode>"), 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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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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}
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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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cl::ParseCommandLineOptions(argc, argv,
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" llvm interpreter & dynamic compiler\n");
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PrintStackTraceOnErrorSignal();
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// Load the bytecode...
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std::string ErrorMsg;
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ModuleProvider *MP = 0;
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try {
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MP = getBytecodeModuleProvider(InputFile);
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} catch (std::string &err) {
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std::cerr << "Error loading program '" << InputFile << "': " << err << "\n";
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exit(1);
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}
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ExecutionEngine *EE = ExecutionEngine::create(MP, ForceInterpreter);
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assert(EE && "Couldn't create an ExecutionEngine, not even an interpreter?");
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// If the user specifically requested an argv[0] to pass into the program, do
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// 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 (InputFile.rfind(".bc") == InputFile.length() - 3)
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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 *Fn = MP->getModule()->getMainFunction();
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if (!Fn) {
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std::cerr << "'main' function not found in module.\n";
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return -1;
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}
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// Run main...
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int Result = EE->runFunctionAsMain(Fn, InputArgv, envp);
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// If the program didn't explicitly call exit, call exit now, for the program.
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// This ensures that any atexit handlers get called correctly.
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Function *Exit = MP->getModule()->getOrInsertFunction("exit", Type::VoidTy,
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Type::IntTy, 0);
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std::vector<GenericValue> Args;
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GenericValue ResultGV;
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ResultGV.IntVal = Result;
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Args.push_back(ResultGV);
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EE->runFunction(Exit, Args);
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std::cerr << "ERROR: exit(" << Result << ") returned!\n";
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abort();
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}
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