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Implement varargs support for LLI! 

llvm-svn: 6043
This commit is contained in:
Chris Lattner 2003-05-08 16:52:43 +00:00
parent 7f389e8cf9
commit 525e251c4e
2 changed files with 56 additions and 73 deletions
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96
llvm/lib/ExecutionEngine/Interpreter/Execution.cpp
View File

@ -761,78 +761,7 @@ static void executeGEPInst(GetElementPtrInst &I, ExecutionContext &SF) {
void Interpreter::executeLoadInst(LoadInst &I, ExecutionContext &SF) {
GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
GenericValue *Ptr = (GenericValue*)GVTOP(SRC);
GenericValue Result;
if (TD.isLittleEndian()) {
switch (I.getType()->getPrimitiveID()) {
case Type::BoolTyID:
case Type::UByteTyID:
case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
case Type::UShortTyID:
case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
((unsigned)Ptr->Untyped[1] << 8);
break;
Load4BytesLittleEndian:
case Type::FloatTyID:
case Type::UIntTyID:
case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
((unsigned)Ptr->Untyped[1] << 8) |
((unsigned)Ptr->Untyped[2] << 16) |
((unsigned)Ptr->Untyped[3] << 24);
break;
case Type::PointerTyID: if (getModule().has32BitPointers())
goto Load4BytesLittleEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
((uint64_t)Ptr->Untyped[1] << 8) |
((uint64_t)Ptr->Untyped[2] << 16) |
((uint64_t)Ptr->Untyped[3] << 24) |
((uint64_t)Ptr->Untyped[4] << 32) |
((uint64_t)Ptr->Untyped[5] << 40) |
((uint64_t)Ptr->Untyped[6] << 48) |
((uint64_t)Ptr->Untyped[7] << 56);
break;
default:
std::cout << "Cannot load value of type " << *I.getType() << "!\n";
abort();
}
} else {
switch (I.getType()->getPrimitiveID()) {
case Type::BoolTyID:
case Type::UByteTyID:
case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
case Type::UShortTyID:
case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
((unsigned)Ptr->Untyped[0] << 8);
break;
Load4BytesBigEndian:
case Type::FloatTyID:
case Type::UIntTyID:
case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
((unsigned)Ptr->Untyped[2] << 8) |
((unsigned)Ptr->Untyped[1] << 16) |
((unsigned)Ptr->Untyped[0] << 24);
break;
case Type::PointerTyID: if (getModule().has32BitPointers())
goto Load4BytesBigEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
((uint64_t)Ptr->Untyped[6] << 8) |
((uint64_t)Ptr->Untyped[5] << 16) |
((uint64_t)Ptr->Untyped[4] << 24) |
((uint64_t)Ptr->Untyped[3] << 32) |
((uint64_t)Ptr->Untyped[2] << 40) |
((uint64_t)Ptr->Untyped[1] << 48) |
((uint64_t)Ptr->Untyped[0] << 56);
break;
default:
std::cout << "Cannot load value of type " << *I.getType() << "!\n";
abort();
}
}
GenericValue Result = LoadValueFromMemory(Ptr, I.getType());
SetValue(&I, Result, SF);
}
@ -1009,6 +938,26 @@ static void executeCastInst(CastInst &I, ExecutionContext &SF) {
SetValue(&I, executeCastOperation(I.getOperand(0), I.getType(), SF), SF);
}
static void executeVarArgInst(VarArgInst &I, ExecutionContext &SF) {
// Get the pointer to the valist element. LLI treats the valist in memory as
// an integer.
GenericValue VAListPtr = getOperandValue(I.getOperand(0), SF);
// Load the pointer
GenericValue VAList =
TheEE->LoadValueFromMemory((GenericValue *)GVTOP(VAListPtr), Type::UIntTy);
unsigned Argument = VAList.IntVal++;
// Update the valist to point to the next argument...
TheEE->StoreValueToMemory(VAList, (GenericValue *)GVTOP(VAListPtr),
Type::UIntTy);
// Set the value...
assert(Argument < SF.VarArgs.size() &&
"Accessing past the last vararg argument!");
SetValue(&I, SF.VarArgs[Argument], SF);
}
//===----------------------------------------------------------------------===//
// Dispatch and Execution Code
@ -1166,9 +1115,10 @@ bool Interpreter::executeInstruction() {
// Miscellaneous Instructions
case Instruction::Call: executeCallInst (cast<CallInst> (I), SF); break;
case Instruction::PHINode: executePHINode (cast<PHINode> (I), SF); break;
case Instruction::Cast: executeCastInst (cast<CastInst> (I), SF); break;
case Instruction::Shl: executeShlInst (cast<ShiftInst>(I), SF); break;
case Instruction::Shr: executeShrInst (cast<ShiftInst>(I), SF); break;
case Instruction::Cast: executeCastInst (cast<CastInst> (I), SF); break;
case Instruction::VarArg: executeVarArgInst(cast<VarArgInst>(I),SF); break;
default:
std::cout << "Don't know how to execute this instruction!\n-->" << I;
abort();

33
llvm/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
View File

@ -695,6 +695,35 @@ GenericValue lle_X_fprintf(FunctionType *M, const vector<GenericValue> &Args) {
return GV;
}
//===----------------------------------------------------------------------===//
// LLVM Intrinsic Functions...
//===----------------------------------------------------------------------===//
// void llvm.va_start(<va_list> *) - Implement the va_start operation...
GenericValue llvm_va_start(FunctionType *F, const vector<GenericValue> &Args) {
assert(Args.size() == 1);
GenericValue *VAListP = (GenericValue *)GVTOP(Args[0]);
GenericValue Val;
Val.UIntVal = 0; // Start at the first '...' argument...
TheInterpreter->StoreValueToMemory(Val, VAListP, Type::UIntTy);
return GenericValue();
}
// void llvm.va_end(<va_list> *) - Implement the va_end operation...
GenericValue llvm_va_end(FunctionType *F, const vector<GenericValue> &Args) {
assert(Args.size() == 1);
return GenericValue(); // Noop!
}
// void llvm.va_copy(<va_list> *, <va_list>) - Implement the va_copy
// operation...
GenericValue llvm_va_copy(FunctionType *F, const vector<GenericValue> &Args) {
assert(Args.size() == 2);
GenericValue *DestVAList = (GenericValue*)GVTOP(Args[0]);
TheInterpreter->StoreValueToMemory(Args[1], DestVAList, Type::UIntTy);
return GenericValue();
}
} // End extern "C"
@ -748,4 +777,8 @@ void Interpreter::initializeExternalFunctions() {
FuncNames["lle_X_ungetc"] = lle_X_ungetc;
FuncNames["lle_X_fprintf"] = lle_X_fprintf;
FuncNames["lle_X_freopen"] = lle_X_freopen;
FuncNames["lle_X_llvm.va_start"]= llvm_va_start;
FuncNames["lle_X_llvm.va_end"] = llvm_va_end;
FuncNames["lle_X_llvm.va_copy"] = llvm_va_copy;
}