mirror of
https://github.com/c64scene-ar/llvm-6502.git
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e93cdce4c9
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@546 91177308-0d34-0410-b5e6-96231b3b80d8
108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
//===-- ExternalMethods.cpp - Implement External Methods ------------------===//
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//
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// This file contains both code to deal with invoking "external" methods, but
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// also contains code that implements "exported" external methods.
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//
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// External methods in LLI are implemented by dlopen'ing the lli executable and
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// using dlsym to look op the methods that we want to invoke. If a method is
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// found, then the arguments are mangled and passed in to the function call.
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//
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//===----------------------------------------------------------------------===//
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#include "Interpreter.h"
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#include "llvm/DerivedTypes.h"
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#include <map>
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#include <dlfcn.h>
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#include <link.h>
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typedef GenericValue (*ExFunc)(MethodType *, const vector<GenericValue> &);
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static map<const Method *, ExFunc> Functions;
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static char getTypeID(const Type *Ty) {
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switch (Ty->getPrimitiveID()) {
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case Type::VoidTyID: return 'V';
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case Type::BoolTyID: return 'o';
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case Type::UByteTyID: return 'B';
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case Type::SByteTyID: return 'b';
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case Type::UShortTyID: return 'S';
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case Type::ShortTyID: return 's';
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case Type::UIntTyID: return 'I';
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case Type::IntTyID: return 'i';
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case Type::ULongTyID: return 'L';
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case Type::LongTyID: return 'l';
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case Type::FloatTyID: return 'F';
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case Type::DoubleTyID: return 'D';
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case Type::PointerTyID: return 'P';
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case Type::MethodTyID: return 'M';
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case Type::StructTyID: return 'T';
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case Type::ArrayTyID: return 'A';
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case Type::OpaqueTyID: return 'O';
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default: return 'U';
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}
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}
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static ExFunc lookupMethod(const Method *M) {
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// Function not found, look it up... start by figuring out what the
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// composite function name should be.
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string ExtName = "lle_";
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const MethodType *MT = M->getType();
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for (unsigned i = 0; const Type *Ty = MT->getContainedType(i); ++i)
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ExtName += getTypeID(Ty);
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ExtName += "_" + M->getName();
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//cout << "Tried: '" << ExtName << "'\n";
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ExFunc FnPtr = (ExFunc)dlsym(RTLD_DEFAULT, ExtName.c_str());
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if (FnPtr == 0) // Try calling a generic function... if it exists...
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FnPtr = (ExFunc)dlsym(RTLD_DEFAULT, ("lle_X_"+M->getName()).c_str());
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if (FnPtr != 0)
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Functions.insert(make_pair(M, FnPtr)); // Cache for later
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return FnPtr;
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}
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void Interpreter::callExternalMethod(Method *M,
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const vector<GenericValue> &ArgVals) {
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// Do a lookup to see if the method is in our cache... this should just be a
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// defered annotation!
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map<const Method *, ExFunc>::iterator FI = Functions.find(M);
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ExFunc Fn = (FI == Functions.end()) ? lookupMethod(M) : FI->second;
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if (Fn == 0) {
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cout << "Tried to execute an unknown external method: "
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<< M->getType()->getDescription() << " " << M->getName() << endl;
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return;
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}
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// TODO: FIXME when types are not const!
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GenericValue Result = Fn(const_cast<MethodType*>(M->getType()), ArgVals);
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// Copy the result back into the result variable if we are not returning void.
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if (M->getReturnType() != Type::VoidTy) {
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CallInst *Caller = ECStack.back().Caller;
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if (Caller) {
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} else {
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// print it.
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// Methods "exported" to the running application...
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//
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extern "C" { // Don't add C++ manglings to llvm mangling :)
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// Implement 'void print(X)' for every type...
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GenericValue lle_X_print(MethodType *M, const vector<GenericValue> &ArgVals) {
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assert(ArgVals.size() == 1 && "generic print only takes one argument!");
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Interpreter::printValue(M->getParamTypes()[0], ArgVals[0]);
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return GenericValue();
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}
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// void "putchar"(sbyte)
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GenericValue lle_Vb_putchar(MethodType *M, const vector<GenericValue> &Args) {
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cout << Args[0].SByteVal;
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return GenericValue();
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}
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} // End extern "C"
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