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//===-- jello.cpp - LLVM Just in Time Compiler ----------------------------===//
//
// This tool implements a just-in-time compiler for LLVM, allowing direct
// execution of LLVM bytecode in an efficient manner.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetMachineImpls.h"
#include "Support/CommandLine.h"
#include "VM.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"));
}
//===----------------------------------------------------------------------===//
// main Driver function
//
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm just in time compiler\n");
// Allocate a target... in the future this will be controllable on the
// command line.
std::auto_ptr<TargetMachine> Target(allocateX86TargetMachine());
assert(Target.get() && "Could not allocate target machine!");
// Parse the input bytecode file...
std::string ErrorMsg;
std::auto_ptr<Module> M(ParseBytecodeFile(InputFile, &ErrorMsg));
if (M.get() == 0) {
std::cerr << argv[0] << ": bytecode '" << InputFile
<< "' didn't read correctly: << " << ErrorMsg << "\n";
return 1;
}
// Build an argv vector...
InputArgv.insert(InputArgv.begin(), InputFile);
char **Argv = new char*[InputArgv.size()+1];
for (unsigned i = 0, e = InputArgv.size(); i != e; ++i) {
Argv[i] = new char[InputArgv[i].size()+1];
std::copy(InputArgv[i].begin(), InputArgv[i].end(), Argv[i]);
Argv[i][InputArgv[i].size()] = 0;
}
Argv[InputArgv.size()] = 0;
// Create the virtual machine object...
VM TheVM(argv[0], Argv, *M.get(), *Target.get());
Function *F = M.get()->getNamedFunction(MainFunction);
if (F == 0) {
std::cerr << "Could not find function '" << MainFunction <<"' in module!\n";
return 1;
}
// Run the virtual machine...
return TheVM.run(F);
}
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