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Factor code out of LLI

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10616 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-12-26 06:50:30 +00:00
parent e5dbbf2bdd
commit 87f03108f2
1 changed files with 54 additions and 0 deletions
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54
lib/ExecutionEngine/ExecutionEngine.cpp
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@ -46,6 +46,60 @@ ExecutionEngine::~ExecutionEngine() {
delete MP;
}
// CreateArgv - Turn a vector of strings into a nice argv style array of
// pointers to null terminated strings.
//
static void *CreateArgv(ExecutionEngine *EE,
const std::vector<std::string> &InputArgv) {
unsigned PtrSize = EE->getTargetData().getPointerSize();
char *Result = new char[(InputArgv.size()+1)*PtrSize];
DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
const Type *SBytePtr = PointerType::get(Type::SByteTy);
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*PtrSize),
SBytePtr);
}
// Null terminate it
EE->StoreValueToMemory(PTOGV(0),
(GenericValue*)(Result+InputArgv.size()*PtrSize),
SBytePtr);
return Result;
}
/// runFunctionAsMain - This is a helper function which wraps runFunction to
/// handle the common task of starting up main with the specified argc, argv,
/// and envp parameters.
int ExecutionEngine::runFunctionAsMain(Function *Fn,
const std::vector<std::string> &argv,
const char * const * envp) {
std::vector<GenericValue> GVArgs;
GenericValue GVArgc;
GVArgc.IntVal = argv.size();
GVArgs.push_back(GVArgc); // Arg #0 = argc.
GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
assert(((char **)GVTOP(GVArgs[1]))[0] && "argv[0] was null after CreateArgv");
std::vector<std::string> EnvVars;
for (unsigned i = 0; envp[i]; ++i)
EnvVars.push_back(envp[i]);
GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
return runFunction(Fn, GVArgs).IntVal;
}
/// If possible, create a JIT, unless the caller specifically requests an
/// Interpreter or there's an error. If even an Interpreter cannot be created,
/// NULL is returned.