1 //===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
3 // This utility provides a way to execute LLVM bytecode without static
4 // compilation. This consists of a very simple and slow (but portable)
5 // interpreter, along with capability for system specific dynamic compilers. At
6 // runtime, the fastest (stable) execution engine is selected to run the
7 // program. This means the JIT compiler for the current platform if it's
10 //===----------------------------------------------------------------------===//
12 #include "ExecutionEngine.h"
13 #include "Support/CommandLine.h"
14 #include "llvm/Bytecode/Reader.h"
15 #include "llvm/Module.h"
16 #include "llvm/Target/TargetMachineImpls.h"
20 InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
23 InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
26 MainFunction ("f", cl::desc("Function to execute"), cl::init("main"),
27 cl::value_desc("function name"));
29 cl::opt<bool> TraceMode("trace", cl::desc("Enable Tracing"));
31 cl::opt<bool> ForceInterpreter("force-interpreter",
32 cl::desc("Force interpretation: disable JIT"),
36 //===----------------------------------------------------------------------===//
37 // main Driver function
39 int main(int argc, char** argv, const char ** envp) {
40 cl::ParseCommandLineOptions(argc, argv,
41 " llvm interpreter & dynamic compiler\n");
43 // Load the bytecode...
45 Module *M = ParseBytecodeFile(InputFile, &ErrorMsg);
47 std::cout << "Error parsing '" << InputFile << "': "
53 ExecutionEngine::create (M, ForceInterpreter, TraceMode);
54 assert (EE && "Couldn't create an ExecutionEngine, not even an interpreter?");
56 // Add the module's name to the start of the vector of arguments to main().
57 // But delete .bc first, since programs (and users) might not expect to
59 const std::string ByteCodeFileSuffix (".bc");
60 if (InputFile.rfind (ByteCodeFileSuffix) ==
61 InputFile.length () - ByteCodeFileSuffix.length ()) {
62 InputFile.erase (InputFile.length () - ByteCodeFileSuffix.length ());
64 InputArgv.insert(InputArgv.begin(), InputFile);
66 // Run the main function!
67 int ExitCode = EE->run(MainFunction, InputArgv, envp);
69 // Now that we are done executing the program, shut down the execution engine