| //===- 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 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. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #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<std::string> |
| MainFunction("f", cl::desc("Function to execute"), cl::init("main"), |
| cl::value_desc("function name")); |
| |
| 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 std::vector<std::string> makeStringVector(char * const *envp) { |
| std::vector<std::string> rv; |
| for (unsigned i = 0; envp[i]; ++i) |
| rv.push_back(envp[i]); |
| return rv; |
| } |
| |
| static void *CreateArgv(ExecutionEngine *EE, |
| const std::vector<std::string> &InputArgv) { |
| if (EE->getTargetData().getPointerSize() == 8) { // 64 bit target? |
| PointerTy *Result = new PointerTy[InputArgv.size()+1]; |
| DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n"); |
| |
| 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), |
| Type::LongTy); |
| } |
| Result[InputArgv.size()] = 0; |
| return Result; |
| } else { // 32 bit target? |
| int *Result = new int[InputArgv.size()+1]; |
| DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n"); |
| |
| 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), |
| Type::IntTy); |
| } |
| Result[InputArgv.size()] = 0; // null terminate it |
| return Result; |
| } |
| } |
| |
| /// callAsMain - Call the function named FnName 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. Returns the result |
| /// from calling FnName, or -1 and prints an error msg. if the named |
| /// function cannot be found. |
| /// |
| int callAsMain(ExecutionEngine *EE, ModuleProvider *MP, |
| const std::string &FnName, |
| const std::vector<std::string> &Args, |
| const std::vector<std::string> &EnvVars) { |
| Function *Fn = MP->getModule()->getNamedFunction(FnName); |
| if (!Fn) { |
| std::cerr << "Function '" << FnName << "' not found in module.\n"; |
| return -1; |
| } |
| std::vector<GenericValue> GVArgs; |
| GenericValue GVArgc; |
| GVArgc.IntVal = Args.size(); |
| GVArgs.push_back(GVArgc); // Arg #0 = argc. |
| GVArgs.push_back(PTOGV(CreateArgv(EE, Args))); // Arg #1 = argv. |
| GVArgs.push_back(PTOGV(CreateArgv(EE, EnvVars))); // Arg #2 = envp. |
| return EE->run(Fn, GVArgs).IntVal; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // 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 parsing '" << 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); |
| |
| // Run the main function! |
| int ExitCode = callAsMain(EE, MP, MainFunction, InputArgv, |
| makeStringVector(envp)); |
| |
| // Now that we are done executing the program, shut down the execution engine |
| delete EE; |
| return ExitCode; |
| } |