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//===-- ExternalMethods.cpp - Implement External Methods ------------------===//
//
// This file contains both code to deal with invoking "external" methods, but
// also contains code that implements "exported" external methods.
//
// External methods in LLI are implemented by dlopen'ing the lli executable and
// using dlsym to look op the methods that we want to invoke. If a method is
// found, then the arguments are mangled and passed in to the function call.
//
//===----------------------------------------------------------------------===//
#include "Interpreter.h"
#include "llvm/DerivedTypes.h"
#include <map>
#include <dlfcn.h>
#include <link.h>
typedef GenericValue (*ExFunc)(MethodType *, const vector<GenericValue> &);
static map<const Method *, ExFunc> Functions;
static char getTypeID(const Type *Ty) {
switch (Ty->getPrimitiveID()) {
case Type::VoidTyID: return 'V';
case Type::BoolTyID: return 'o';
case Type::UByteTyID: return 'B';
case Type::SByteTyID: return 'b';
case Type::UShortTyID: return 'S';
case Type::ShortTyID: return 's';
case Type::UIntTyID: return 'I';
case Type::IntTyID: return 'i';
case Type::ULongTyID: return 'L';
case Type::LongTyID: return 'l';
case Type::FloatTyID: return 'F';
case Type::DoubleTyID: return 'D';
case Type::PointerTyID: return 'P';
case Type::MethodTyID: return 'M';
case Type::StructTyID: return 'T';
case Type::ArrayTyID: return 'A';
case Type::OpaqueTyID: return 'O';
default: return 'U';
}
}
static ExFunc lookupMethod(const Method *M) {
// Function not found, look it up... start by figuring out what the
// composite function name should be.
string ExtName = "lle_";
const MethodType *MT = M->getType();
for (unsigned i = 0; const Type *Ty = MT->getContainedType(i); ++i)
ExtName += getTypeID(Ty);
ExtName += "_" + M->getName();
//cout << "Tried: '" << ExtName << "'\n";
ExFunc FnPtr = (ExFunc)dlsym(RTLD_DEFAULT, ExtName.c_str());
if (FnPtr == 0) // Try calling a generic function... if it exists...
FnPtr = (ExFunc)dlsym(RTLD_DEFAULT, ("lle_X_"+M->getName()).c_str());
if (FnPtr != 0)
Functions.insert(make_pair(M, FnPtr)); // Cache for later
return FnPtr;
}
void Interpreter::callExternalMethod(Method *M,
const vector<GenericValue> &ArgVals) {
// Do a lookup to see if the method is in our cache... this should just be a
// defered annotation!
map<const Method *, ExFunc>::iterator FI = Functions.find(M);
ExFunc Fn = (FI == Functions.end()) ? lookupMethod(M) : FI->second;
if (Fn == 0) {
cout << "Tried to execute an unknown external method: "
<< M->getType()->getDescription() << " " << M->getName() << endl;
return;
}
// TODO: FIXME when types are not const!
GenericValue Result = Fn(const_cast<MethodType*>(M->getType()), ArgVals);
// Copy the result back into the result variable if we are not returning void.
if (M->getReturnType() != Type::VoidTy) {
CallInst *Caller = ECStack.back().Caller;
if (Caller) {
} else {
// print it.
}
}
}
//===----------------------------------------------------------------------===//
// Methods "exported" to the running application...
//
extern "C" { // Don't add C++ manglings to llvm mangling :)
// Implement 'void print(X)' for every type...
GenericValue lle_X_print(MethodType *M, const vector<GenericValue> &ArgVals) {
assert(ArgVals.size() == 1 && "generic print only takes one argument!");
Interpreter::printValue(M->getParamTypes()[0], ArgVals[0]);
return GenericValue();
}
// void "putchar"(sbyte)
GenericValue lle_Vb_putchar(MethodType *M, const vector<GenericValue> &Args) {
cout << Args[0].SByteVal;
return GenericValue();
}
} // End extern "C"
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