llvm-6502/tools/lli/lli.cpp

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//===- 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);
}
#if 0
// Link in the runtime library for LLI...
std::string RuntimeLib = getCurrentExecutablePath();
if (!RuntimeLib.empty()) RuntimeLib += "/";
RuntimeLib += "RuntimeLib.bc";
if (Module *SupportLib = ParseBytecodeFile(RuntimeLib, &ErrorMsg)) {
if (LinkModules(M, SupportLib, &ErrorMsg))
std::cerr << "Error Linking runtime library into current module: "
<< ErrorMsg << "\n";
} else {
std::cerr << "Error loading runtime library '"+RuntimeLib+"': "
<< ErrorMsg << "\n";
}
#endif
// FIXME: in adddition to being gross, this is also wrong: This should use the
// pointersize/endianness of the host if the pointer size is not specified!!
unsigned Config = (M->getEndianness() != Module::BigEndian ? TM::LittleEndian : TM::BigEndian) |
(M->getPointerSize() != Module::Pointer64 ? TM::PtrSize32 : TM::PtrSize64);
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, Config);
// If we can't make a JIT, make an interpreter instead.
if (EE == 0)
EE = ExecutionEngine::createInterpreter(M, Config, 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;
}