| //===- 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. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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 "llvm/DerivedTypes.h" |
| #include "llvm/Module.h" |
| #include "llvm/ModuleProvider.h" |
| #include "llvm/Bytecode/Reader.h" |
| #include "llvm/ExecutionEngine/ExecutionEngine.h" |
| #include "llvm/ExecutionEngine/GenericValue.h" |
| #include "llvm/Target/TargetMachineImpls.h" |
| #include "llvm/Target/TargetData.h" |
| #include "Support/CommandLine.h" |
| #include "Support/Debug.h" |
| #include "Support/SystemUtils.h" |
| |
| using namespace llvm; |
| |
| namespace { |
| cl::opt<std::string> |
| InputFile(cl::desc("<input bytecode>"), 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<std::string> |
| FakeArgv0("fake-argv0", |
| cl::desc("Override the 'argv[0]' value passed into the executing" |
| " program"), cl::value_desc("executable")); |
| } |
| |
| static void *CreateArgv(ExecutionEngine *EE, |
| const std::vector<std::string> &InputArgv) { |
| unsigned PtrSize = EE->getTargetData().getPointerSize(); |
| char *Result = new char[(InputArgv.size()+1)*PtrSize]; |
| |
| DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n"); |
| const Type *SBytePtr = PointerType::get(Type::SByteTy); |
| |
| for (unsigned i = 0; i != InputArgv.size(); ++i) { |
| unsigned Size = InputArgv[i].size()+1; |
| char *Dest = new char[Size]; |
| DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n"); |
| |
| std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest); |
| Dest[Size-1] = 0; |
| |
| // Endian safe: Result[i] = (PointerTy)Dest; |
| EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize), |
| SBytePtr); |
| } |
| |
| // Null terminate it |
| EE->StoreValueToMemory(PTOGV(0), |
| (GenericValue*)(Result+InputArgv.size()*PtrSize), |
| SBytePtr); |
| return Result; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // main Driver function |
| // |
| int main(int argc, char **argv, char * const *envp) { |
| cl::ParseCommandLineOptions(argc, argv, |
| " llvm interpreter & dynamic compiler\n"); |
| |
| // Load the bytecode... |
| std::string ErrorMsg; |
| ModuleProvider *MP = 0; |
| try { |
| MP = getBytecodeModuleProvider(InputFile); |
| } catch (std::string &err) { |
| std::cerr << "Error loading program '" << InputFile << "': " << err << "\n"; |
| exit(1); |
| } |
| |
| ExecutionEngine *EE = |
| ExecutionEngine::create(MP, ForceInterpreter); |
| assert(EE && "Couldn't create an ExecutionEngine, not even an interpreter?"); |
| |
| // 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); |
| |
| // 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 *Fn = MP->getModule()->getMainFunction(); |
| if (!Fn) { |
| std::cerr << "'main' function not found in module.\n"; |
| return -1; |
| } |
| |
| std::vector<GenericValue> GVArgs; |
| GenericValue GVArgc; |
| GVArgc.IntVal = InputArgv.size(); |
| GVArgs.push_back(GVArgc); // Arg #0 = argc. |
| GVArgs.push_back(PTOGV(CreateArgv(EE, InputArgv))); // Arg #1 = argv. |
| assert(((char **)GVTOP(GVArgs[1]))[0] && "argv[0] was null after CreateArgv"); |
| |
| std::vector<std::string> EnvVars; |
| for (unsigned i = 0; envp[i]; ++i) |
| EnvVars.push_back(envp[i]); |
| GVArgs.push_back(PTOGV(CreateArgv(EE, EnvVars))); // Arg #2 = envp. |
| GenericValue Result = EE->runFunction(Fn, GVArgs); |
| |
| // If the program didn't explicitly call exit, call exit now, for the program. |
| // This ensures that any atexit handlers get called correctly. |
| Function *Exit = MP->getModule()->getOrInsertFunction("exit", Type::VoidTy, |
| Type::IntTy, 0); |
| |
| GVArgs.clear(); |
| GVArgs.push_back(Result); |
| EE->runFunction(Exit, GVArgs); |
| |
| std::cerr << "ERROR: exit(" << Result.IntVal << ") returned!\n"; |
| abort(); |
| } |