| //===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===// |
| // |
| // 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 "ExecutionEngine.h" |
| #include "Support/CommandLine.h" |
| #include "llvm/Bytecode/Reader.h" |
| #include "llvm/Module.h" |
| #include "llvm/Target/TargetMachineImpls.h" |
| |
| 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> DebugMode("d", cl::desc("Start program in debugger")); |
| |
| cl::opt<bool> TraceMode("trace", cl::desc("Enable Tracing")); |
| |
| cl::opt<bool> ForceInterpreter("force-interpreter", |
| cl::desc("Force interpretation: disable JIT"), |
| cl::init(false)); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // ExecutionEngine Class Implementation |
| // |
| |
| ExecutionEngine::~ExecutionEngine() { |
| delete &CurMod; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // main Driver function |
| // |
| int main(int argc, char** argv, const char ** envp) { |
| cl::ParseCommandLineOptions(argc, argv, |
| " llvm interpreter & dynamic compiler\n"); |
| |
| // Load the bytecode... |
| std::string ErrorMsg; |
| Module *M = ParseBytecodeFile(InputFile, &ErrorMsg); |
| if (M == 0) { |
| std::cout << "Error parsing '" << InputFile << "': " |
| << ErrorMsg << "\n"; |
| exit(1); |
| } |
| |
| ExecutionEngine *EE = 0; |
| |
| // If there is nothing that is forcing us to use the interpreter, make a JIT. |
| if (!ForceInterpreter && !DebugMode && !TraceMode) |
| EE = ExecutionEngine::createJIT(M); |
| |
| // If we can't make a JIT, make an interpreter instead. |
| if (EE == 0) |
| EE = ExecutionEngine::createInterpreter(M, DebugMode, TraceMode); |
| |
| // Add the module name to the start of the argv vector... |
| // But delete .bc first, since programs (and users) might not expect to |
| // see it. |
| const std::string ByteCodeFileSuffix (".bc"); |
| if (InputFile.rfind (ByteCodeFileSuffix) == |
| InputFile.length () - ByteCodeFileSuffix.length ()) { |
| InputFile.erase (InputFile.length () - ByteCodeFileSuffix.length ()); |
| } |
| InputArgv.insert(InputArgv.begin(), InputFile); |
| |
| // Run the main function! |
| int ExitCode = EE->run(MainFunction, InputArgv, envp); |
| |
| // Now that we are done executing the program, shut down the execution engine |
| delete EE; |
| return ExitCode; |
| } |