#define DEBUG_TYPE "interpreter"
#include "Interpreter.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include <algorithm>
#include <cmath>
using namespace llvm;
STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed");
static cl::opt<bool> PrintVolatile("interpreter-print-volatile", cl::Hidden,
cl::desc("make the interpreter print every volatile load and store"));
static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) {
SF.Values[V] = Val;
}
#define IMPLEMENT_BINARY_OPERATOR(OP, TY) \
case Type::TY##TyID: \
Dest.TY##Val = Src1.TY##Val OP Src2.TY##Val; \
break
static void executeFAddInst(GenericValue &Dest, GenericValue Src1,
GenericValue Src2, Type *Ty) {
switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(+, Float);
IMPLEMENT_BINARY_OPERATOR(+, Double);
default:
dbgs() << "Unhandled type for FAdd instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
}
static void executeFSubInst(GenericValue &Dest, GenericValue Src1,
GenericValue Src2, Type *Ty) {
switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(-, Float);
IMPLEMENT_BINARY_OPERATOR(-, Double);
default:
dbgs() << "Unhandled type for FSub instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
}
static void executeFMulInst(GenericValue &Dest, GenericValue Src1,
GenericValue Src2, Type *Ty) {
switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(*, Float);
IMPLEMENT_BINARY_OPERATOR(*, Double);
default:
dbgs() << "Unhandled type for FMul instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
}
static void executeFDivInst(GenericValue &Dest, GenericValue Src1,
GenericValue Src2, Type *Ty) {
switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(/, Float);
IMPLEMENT_BINARY_OPERATOR(/, Double);
default:
dbgs() << "Unhandled type for FDiv instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
}
static void executeFRemInst(GenericValue &Dest, GenericValue Src1,
GenericValue Src2, Type *Ty) {
switch (Ty->getTypeID()) {
case Type::FloatTyID:
Dest.FloatVal = fmod(Src1.FloatVal, Src2.FloatVal);
break;
case Type::DoubleTyID:
Dest.DoubleVal = fmod(Src1.DoubleVal, Src2.DoubleVal);
break;
default:
dbgs() << "Unhandled type for Rem instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
}
#define IMPLEMENT_INTEGER_ICMP(OP, TY) \
case Type::IntegerTyID: \
Dest.IntVal = APInt(1,Src1.IntVal.OP(Src2.IntVal)); \
break;
#define IMPLEMENT_POINTER_ICMP(OP) \
case Type::PointerTyID: \
Dest.IntVal = APInt(1,(void*)(intptr_t)Src1.PointerVal OP \
(void*)(intptr_t)Src2.PointerVal); \
break;
static GenericValue executeICMP_EQ(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(eq,Ty);
IMPLEMENT_POINTER_ICMP(==);
default:
dbgs() << "Unhandled type for ICMP_EQ predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeICMP_NE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(ne,Ty);
IMPLEMENT_POINTER_ICMP(!=);
default:
dbgs() << "Unhandled type for ICMP_NE predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeICMP_ULT(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(ult,Ty);
IMPLEMENT_POINTER_ICMP(<);
default:
dbgs() << "Unhandled type for ICMP_ULT predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeICMP_SLT(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(slt,Ty);
IMPLEMENT_POINTER_ICMP(<);
default:
dbgs() << "Unhandled type for ICMP_SLT predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeICMP_UGT(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(ugt,Ty);
IMPLEMENT_POINTER_ICMP(>);
default:
dbgs() << "Unhandled type for ICMP_UGT predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeICMP_SGT(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(sgt,Ty);
IMPLEMENT_POINTER_ICMP(>);
default:
dbgs() << "Unhandled type for ICMP_SGT predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeICMP_ULE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(ule,Ty);
IMPLEMENT_POINTER_ICMP(<=);
default:
dbgs() << "Unhandled type for ICMP_ULE predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeICMP_SLE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(sle,Ty);
IMPLEMENT_POINTER_ICMP(<=);
default:
dbgs() << "Unhandled type for ICMP_SLE predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeICMP_UGE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(uge,Ty);
IMPLEMENT_POINTER_ICMP(>=);
default:
dbgs() << "Unhandled type for ICMP_UGE predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeICMP_SGE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_INTEGER_ICMP(sge,Ty);
IMPLEMENT_POINTER_ICMP(>=);
default:
dbgs() << "Unhandled type for ICMP_SGE predicate: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
void Interpreter::visitICmpInst(ICmpInst &I) {
ExecutionContext &SF = ECStack.back();
Type *Ty = I.getOperand(0)->getType();
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue R;
switch (I.getPredicate()) {
case ICmpInst::ICMP_EQ: R = executeICMP_EQ(Src1, Src2, Ty); break;
case ICmpInst::ICMP_NE: R = executeICMP_NE(Src1, Src2, Ty); break;
case ICmpInst::ICMP_ULT: R = executeICMP_ULT(Src1, Src2, Ty); break;
case ICmpInst::ICMP_SLT: R = executeICMP_SLT(Src1, Src2, Ty); break;
case ICmpInst::ICMP_UGT: R = executeICMP_UGT(Src1, Src2, Ty); break;
case ICmpInst::ICMP_SGT: R = executeICMP_SGT(Src1, Src2, Ty); break;
case ICmpInst::ICMP_ULE: R = executeICMP_ULE(Src1, Src2, Ty); break;
case ICmpInst::ICMP_SLE: R = executeICMP_SLE(Src1, Src2, Ty); break;
case ICmpInst::ICMP_UGE: R = executeICMP_UGE(Src1, Src2, Ty); break;
case ICmpInst::ICMP_SGE: R = executeICMP_SGE(Src1, Src2, Ty); break;
default:
dbgs() << "Don't know how to handle this ICmp predicate!\n-->" << I;
llvm_unreachable(0);
}
SetValue(&I, R, SF);
}
#define IMPLEMENT_FCMP(OP, TY) \
case Type::TY##TyID: \
Dest.IntVal = APInt(1,Src1.TY##Val OP Src2.TY##Val); \
break
static GenericValue executeFCMP_OEQ(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_FCMP(==, Float);
IMPLEMENT_FCMP(==, Double);
default:
dbgs() << "Unhandled type for FCmp EQ instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeFCMP_ONE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_FCMP(!=, Float);
IMPLEMENT_FCMP(!=, Double);
default:
dbgs() << "Unhandled type for FCmp NE instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeFCMP_OLE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_FCMP(<=, Float);
IMPLEMENT_FCMP(<=, Double);
default:
dbgs() << "Unhandled type for FCmp LE instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeFCMP_OGE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_FCMP(>=, Float);
IMPLEMENT_FCMP(>=, Double);
default:
dbgs() << "Unhandled type for FCmp GE instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeFCMP_OLT(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_FCMP(<, Float);
IMPLEMENT_FCMP(<, Double);
default:
dbgs() << "Unhandled type for FCmp LT instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
static GenericValue executeFCMP_OGT(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
switch (Ty->getTypeID()) {
IMPLEMENT_FCMP(>, Float);
IMPLEMENT_FCMP(>, Double);
default:
dbgs() << "Unhandled type for FCmp GT instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
return Dest;
}
#define IMPLEMENT_UNORDERED(TY, X,Y) \
if (TY->isFloatTy()) { \
if (X.FloatVal != X.FloatVal || Y.FloatVal != Y.FloatVal) { \
Dest.IntVal = APInt(1,true); \
return Dest; \
} \
} else if (X.DoubleVal != X.DoubleVal || Y.DoubleVal != Y.DoubleVal) { \
Dest.IntVal = APInt(1,true); \
return Dest; \
}
static GenericValue executeFCMP_UEQ(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
IMPLEMENT_UNORDERED(Ty, Src1, Src2)
return executeFCMP_OEQ(Src1, Src2, Ty);
}
static GenericValue executeFCMP_UNE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
IMPLEMENT_UNORDERED(Ty, Src1, Src2)
return executeFCMP_ONE(Src1, Src2, Ty);
}
static GenericValue executeFCMP_ULE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
IMPLEMENT_UNORDERED(Ty, Src1, Src2)
return executeFCMP_OLE(Src1, Src2, Ty);
}
static GenericValue executeFCMP_UGE(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
IMPLEMENT_UNORDERED(Ty, Src1, Src2)
return executeFCMP_OGE(Src1, Src2, Ty);
}
static GenericValue executeFCMP_ULT(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
IMPLEMENT_UNORDERED(Ty, Src1, Src2)
return executeFCMP_OLT(Src1, Src2, Ty);
}
static GenericValue executeFCMP_UGT(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
IMPLEMENT_UNORDERED(Ty, Src1, Src2)
return executeFCMP_OGT(Src1, Src2, Ty);
}
static GenericValue executeFCMP_ORD(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
if (Ty->isFloatTy())
Dest.IntVal = APInt(1,(Src1.FloatVal == Src1.FloatVal &&
Src2.FloatVal == Src2.FloatVal));
else
Dest.IntVal = APInt(1,(Src1.DoubleVal == Src1.DoubleVal &&
Src2.DoubleVal == Src2.DoubleVal));
return Dest;
}
static GenericValue executeFCMP_UNO(GenericValue Src1, GenericValue Src2,
Type *Ty) {
GenericValue Dest;
if (Ty->isFloatTy())
Dest.IntVal = APInt(1,(Src1.FloatVal != Src1.FloatVal ||
Src2.FloatVal != Src2.FloatVal));
else
Dest.IntVal = APInt(1,(Src1.DoubleVal != Src1.DoubleVal ||
Src2.DoubleVal != Src2.DoubleVal));
return Dest;
}
void Interpreter::visitFCmpInst(FCmpInst &I) {
ExecutionContext &SF = ECStack.back();
Type *Ty = I.getOperand(0)->getType();
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue R;
switch (I.getPredicate()) {
case FCmpInst::FCMP_FALSE: R.IntVal = APInt(1,false); break;
case FCmpInst::FCMP_TRUE: R.IntVal = APInt(1,true); break;
case FCmpInst::FCMP_ORD: R = executeFCMP_ORD(Src1, Src2, Ty); break;
case FCmpInst::FCMP_UNO: R = executeFCMP_UNO(Src1, Src2, Ty); break;
case FCmpInst::FCMP_UEQ: R = executeFCMP_UEQ(Src1, Src2, Ty); break;
case FCmpInst::FCMP_OEQ: R = executeFCMP_OEQ(Src1, Src2, Ty); break;
case FCmpInst::FCMP_UNE: R = executeFCMP_UNE(Src1, Src2, Ty); break;
case FCmpInst::FCMP_ONE: R = executeFCMP_ONE(Src1, Src2, Ty); break;
case FCmpInst::FCMP_ULT: R = executeFCMP_ULT(Src1, Src2, Ty); break;
case FCmpInst::FCMP_OLT: R = executeFCMP_OLT(Src1, Src2, Ty); break;
case FCmpInst::FCMP_UGT: R = executeFCMP_UGT(Src1, Src2, Ty); break;
case FCmpInst::FCMP_OGT: R = executeFCMP_OGT(Src1, Src2, Ty); break;
case FCmpInst::FCMP_ULE: R = executeFCMP_ULE(Src1, Src2, Ty); break;
case FCmpInst::FCMP_OLE: R = executeFCMP_OLE(Src1, Src2, Ty); break;
case FCmpInst::FCMP_UGE: R = executeFCMP_UGE(Src1, Src2, Ty); break;
case FCmpInst::FCMP_OGE: R = executeFCMP_OGE(Src1, Src2, Ty); break;
default:
dbgs() << "Don't know how to handle this FCmp predicate!\n-->" << I;
llvm_unreachable(0);
}
SetValue(&I, R, SF);
}
static GenericValue executeCmpInst(unsigned predicate, GenericValue Src1,
GenericValue Src2, Type *Ty) {
GenericValue Result;
switch (predicate) {
case ICmpInst::ICMP_EQ: return executeICMP_EQ(Src1, Src2, Ty);
case ICmpInst::ICMP_NE: return executeICMP_NE(Src1, Src2, Ty);
case ICmpInst::ICMP_UGT: return executeICMP_UGT(Src1, Src2, Ty);
case ICmpInst::ICMP_SGT: return executeICMP_SGT(Src1, Src2, Ty);
case ICmpInst::ICMP_ULT: return executeICMP_ULT(Src1, Src2, Ty);
case ICmpInst::ICMP_SLT: return executeICMP_SLT(Src1, Src2, Ty);
case ICmpInst::ICMP_UGE: return executeICMP_UGE(Src1, Src2, Ty);
case ICmpInst::ICMP_SGE: return executeICMP_SGE(Src1, Src2, Ty);
case ICmpInst::ICMP_ULE: return executeICMP_ULE(Src1, Src2, Ty);
case ICmpInst::ICMP_SLE: return executeICMP_SLE(Src1, Src2, Ty);
case FCmpInst::FCMP_ORD: return executeFCMP_ORD(Src1, Src2, Ty);
case FCmpInst::FCMP_UNO: return executeFCMP_UNO(Src1, Src2, Ty);
case FCmpInst::FCMP_OEQ: return executeFCMP_OEQ(Src1, Src2, Ty);
case FCmpInst::FCMP_UEQ: return executeFCMP_UEQ(Src1, Src2, Ty);
case FCmpInst::FCMP_ONE: return executeFCMP_ONE(Src1, Src2, Ty);
case FCmpInst::FCMP_UNE: return executeFCMP_UNE(Src1, Src2, Ty);
case FCmpInst::FCMP_OLT: return executeFCMP_OLT(Src1, Src2, Ty);
case FCmpInst::FCMP_ULT: return executeFCMP_ULT(Src1, Src2, Ty);
case FCmpInst::FCMP_OGT: return executeFCMP_OGT(Src1, Src2, Ty);
case FCmpInst::FCMP_UGT: return executeFCMP_UGT(Src1, Src2, Ty);
case FCmpInst::FCMP_OLE: return executeFCMP_OLE(Src1, Src2, Ty);
case FCmpInst::FCMP_ULE: return executeFCMP_ULE(Src1, Src2, Ty);
case FCmpInst::FCMP_OGE: return executeFCMP_OGE(Src1, Src2, Ty);
case FCmpInst::FCMP_UGE: return executeFCMP_UGE(Src1, Src2, Ty);
case FCmpInst::FCMP_FALSE: {
GenericValue Result;
Result.IntVal = APInt(1, false);
return Result;
}
case FCmpInst::FCMP_TRUE: {
GenericValue Result;
Result.IntVal = APInt(1, true);
return Result;
}
default:
dbgs() << "Unhandled Cmp predicate\n";
llvm_unreachable(0);
}
}
void Interpreter::visitBinaryOperator(BinaryOperator &I) {
ExecutionContext &SF = ECStack.back();
Type *Ty = I.getOperand(0)->getType();
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue R;
switch (I.getOpcode()) {
case Instruction::Add: R.IntVal = Src1.IntVal + Src2.IntVal; break;
case Instruction::Sub: R.IntVal = Src1.IntVal - Src2.IntVal; break;
case Instruction::Mul: R.IntVal = Src1.IntVal * Src2.IntVal; break;
case Instruction::FAdd: executeFAddInst(R, Src1, Src2, Ty); break;
case Instruction::FSub: executeFSubInst(R, Src1, Src2, Ty); break;
case Instruction::FMul: executeFMulInst(R, Src1, Src2, Ty); break;
case Instruction::FDiv: executeFDivInst(R, Src1, Src2, Ty); break;
case Instruction::FRem: executeFRemInst(R, Src1, Src2, Ty); break;
case Instruction::UDiv: R.IntVal = Src1.IntVal.udiv(Src2.IntVal); break;
case Instruction::SDiv: R.IntVal = Src1.IntVal.sdiv(Src2.IntVal); break;
case Instruction::URem: R.IntVal = Src1.IntVal.urem(Src2.IntVal); break;
case Instruction::SRem: R.IntVal = Src1.IntVal.srem(Src2.IntVal); break;
case Instruction::And: R.IntVal = Src1.IntVal & Src2.IntVal; break;
case Instruction::Or: R.IntVal = Src1.IntVal | Src2.IntVal; break;
case Instruction::Xor: R.IntVal = Src1.IntVal ^ Src2.IntVal; break;
default:
dbgs() << "Don't know how to handle this binary operator!\n-->" << I;
llvm_unreachable(0);
}
SetValue(&I, R, SF);
}
static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2,
GenericValue Src3) {
return Src1.IntVal == 0 ? Src3 : Src2;
}
void Interpreter::visitSelectInst(SelectInst &I) {
ExecutionContext &SF = ECStack.back();
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue Src3 = getOperandValue(I.getOperand(2), SF);
GenericValue R = executeSelectInst(Src1, Src2, Src3);
SetValue(&I, R, SF);
}
void Interpreter::exitCalled(GenericValue GV) {
ECStack.clear();
runAtExitHandlers();
exit(GV.IntVal.zextOrTrunc(32).getZExtValue());
}
void Interpreter::popStackAndReturnValueToCaller(Type *RetTy,
GenericValue Result) {
ECStack.pop_back();
if (ECStack.empty()) { if (RetTy && !RetTy->isVoidTy()) { ExitValue = Result; } else {
memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
}
} else {
ExecutionContext &CallingSF = ECStack.back();
if (Instruction *I = CallingSF.Caller.getInstruction()) {
if (!CallingSF.Caller.getType()->isVoidTy())
SetValue(I, Result, CallingSF);
if (InvokeInst *II = dyn_cast<InvokeInst> (I))
SwitchToNewBasicBlock (II->getNormalDest (), CallingSF);
CallingSF.Caller = CallSite(); }
}
}
void Interpreter::visitReturnInst(ReturnInst &I) {
ExecutionContext &SF = ECStack.back();
Type *RetTy = Type::getVoidTy(I.getContext());
GenericValue Result;
if (I.getNumOperands()) {
RetTy = I.getReturnValue()->getType();
Result = getOperandValue(I.getReturnValue(), SF);
}
popStackAndReturnValueToCaller(RetTy, Result);
}
void Interpreter::visitUnreachableInst(UnreachableInst &I) {
report_fatal_error("Program executed an 'unreachable' instruction!");
}
void Interpreter::visitBranchInst(BranchInst &I) {
ExecutionContext &SF = ECStack.back();
BasicBlock *Dest;
Dest = I.getSuccessor(0); if (!I.isUnconditional()) {
Value *Cond = I.getCondition();
if (getOperandValue(Cond, SF).IntVal == 0) Dest = I.getSuccessor(1);
}
SwitchToNewBasicBlock(Dest, SF);
}
void Interpreter::visitSwitchInst(SwitchInst &I) {
ExecutionContext &SF = ECStack.back();
Value* Cond = I.getCondition();
Type *ElTy = Cond->getType();
GenericValue CondVal = getOperandValue(Cond, SF);
BasicBlock *Dest = 0;
for (SwitchInst::CaseIt i = I.case_begin(), e = I.case_end(); i != e; ++i) {
IntegersSubset& Case = i.getCaseValueEx();
if (Case.isSingleNumber()) {
const ConstantInt *CI = Case.getSingleNumber(0).toConstantInt();
GenericValue Val = getOperandValue(const_cast<ConstantInt*>(CI), SF);
if (executeICMP_EQ(Val, CondVal, ElTy).IntVal != 0) {
Dest = cast<BasicBlock>(i.getCaseSuccessor());
break;
}
}
if (Case.isSingleNumbersOnly()) {
for (unsigned n = 0, en = Case.getNumItems(); n != en; ++n) {
const ConstantInt *CI = Case.getSingleNumber(n).toConstantInt();
GenericValue Val = getOperandValue(const_cast<ConstantInt*>(CI), SF);
if (executeICMP_EQ(Val, CondVal, ElTy).IntVal != 0) {
Dest = cast<BasicBlock>(i.getCaseSuccessor());
break;
}
}
} else
for (unsigned n = 0, en = Case.getNumItems(); n != en; ++n) {
IntegersSubset::Range r = Case.getItem(n);
const ConstantInt *LowCI = r.getLow().toConstantInt();
const ConstantInt *HighCI = r.getHigh().toConstantInt();
GenericValue Low = getOperandValue(const_cast<ConstantInt*>(LowCI), SF);
GenericValue High = getOperandValue(const_cast<ConstantInt*>(HighCI), SF);
if (executeICMP_ULE(Low, CondVal, ElTy).IntVal != 0 &&
executeICMP_ULE(CondVal, High, ElTy).IntVal != 0) {
Dest = cast<BasicBlock>(i.getCaseSuccessor());
break;
}
}
}
if (!Dest) Dest = I.getDefaultDest(); SwitchToNewBasicBlock(Dest, SF);
}
void Interpreter::visitIndirectBrInst(IndirectBrInst &I) {
ExecutionContext &SF = ECStack.back();
void *Dest = GVTOP(getOperandValue(I.getAddress(), SF));
SwitchToNewBasicBlock((BasicBlock*)Dest, SF);
}
void Interpreter::SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF){
BasicBlock *PrevBB = SF.CurBB; SF.CurBB = Dest; SF.CurInst = SF.CurBB->begin();
if (!isa<PHINode>(SF.CurInst)) return;
std::vector<GenericValue> ResultValues;
for (; PHINode *PN = dyn_cast<PHINode>(SF.CurInst); ++SF.CurInst) {
int i = PN->getBasicBlockIndex(PrevBB);
assert(i != -1 && "PHINode doesn't contain entry for predecessor??");
Value *IncomingValue = PN->getIncomingValue(i);
ResultValues.push_back(getOperandValue(IncomingValue, SF));
}
SF.CurInst = SF.CurBB->begin();
for (unsigned i = 0; isa<PHINode>(SF.CurInst); ++SF.CurInst, ++i) {
PHINode *PN = cast<PHINode>(SF.CurInst);
SetValue(PN, ResultValues[i], SF);
}
}
void Interpreter::visitAllocaInst(AllocaInst &I) {
ExecutionContext &SF = ECStack.back();
Type *Ty = I.getType()->getElementType();
unsigned NumElements =
getOperandValue(I.getOperand(0), SF).IntVal.getZExtValue();
unsigned TypeSize = (size_t)TD.getTypeAllocSize(Ty);
unsigned MemToAlloc = std::max(1U, NumElements * TypeSize);
void *Memory = malloc(MemToAlloc);
DEBUG(dbgs() << "Allocated Type: " << *Ty << " (" << TypeSize << " bytes) x "
<< NumElements << " (Total: " << MemToAlloc << ") at "
<< uintptr_t(Memory) << '\n');
GenericValue Result = PTOGV(Memory);
assert(Result.PointerVal != 0 && "Null pointer returned by malloc!");
SetValue(&I, Result, SF);
if (I.getOpcode() == Instruction::Alloca)
ECStack.back().Allocas.add(Memory);
}
GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I,
gep_type_iterator E,
ExecutionContext &SF) {
assert(Ptr->getType()->isPointerTy() &&
"Cannot getElementOffset of a nonpointer type!");
uint64_t Total = 0;
for (; I != E; ++I) {
if (StructType *STy = dyn_cast<StructType>(*I)) {
const StructLayout *SLO = TD.getStructLayout(STy);
const ConstantInt *CPU = cast<ConstantInt>(I.getOperand());
unsigned Index = unsigned(CPU->getZExtValue());
Total += SLO->getElementOffset(Index);
} else {
SequentialType *ST = cast<SequentialType>(*I);
GenericValue IdxGV = getOperandValue(I.getOperand(), SF);
int64_t Idx;
unsigned BitWidth =
cast<IntegerType>(I.getOperand()->getType())->getBitWidth();
if (BitWidth == 32)
Idx = (int64_t)(int32_t)IdxGV.IntVal.getZExtValue();
else {
assert(BitWidth == 64 && "Invalid index type for getelementptr");
Idx = (int64_t)IdxGV.IntVal.getZExtValue();
}
Total += TD.getTypeAllocSize(ST->getElementType())*Idx;
}
}
GenericValue Result;
Result.PointerVal = ((char*)getOperandValue(Ptr, SF).PointerVal) + Total;
DEBUG(dbgs() << "GEP Index " << Total << " bytes.\n");
return Result;
}
void Interpreter::visitGetElementPtrInst(GetElementPtrInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeGEPOperation(I.getPointerOperand(),
gep_type_begin(I), gep_type_end(I), SF), SF);
}
void Interpreter::visitLoadInst(LoadInst &I) {
ExecutionContext &SF = ECStack.back();
GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
GenericValue *Ptr = (GenericValue*)GVTOP(SRC);
GenericValue Result;
LoadValueFromMemory(Result, Ptr, I.getType());
SetValue(&I, Result, SF);
if (I.isVolatile() && PrintVolatile)
dbgs() << "Volatile load " << I;
}
void Interpreter::visitStoreInst(StoreInst &I) {
ExecutionContext &SF = ECStack.back();
GenericValue Val = getOperandValue(I.getOperand(0), SF);
GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
StoreValueToMemory(Val, (GenericValue *)GVTOP(SRC),
I.getOperand(0)->getType());
if (I.isVolatile() && PrintVolatile)
dbgs() << "Volatile store: " << I;
}
void Interpreter::visitCallSite(CallSite CS) {
ExecutionContext &SF = ECStack.back();
Function *F = CS.getCalledFunction();
if (F && F->isDeclaration())
switch (F->getIntrinsicID()) {
case Intrinsic::not_intrinsic:
break;
case Intrinsic::vastart: { GenericValue ArgIndex;
ArgIndex.UIntPairVal.first = ECStack.size() - 1;
ArgIndex.UIntPairVal.second = 0;
SetValue(CS.getInstruction(), ArgIndex, SF);
return;
}
case Intrinsic::vaend: return;
case Intrinsic::vacopy: SetValue(CS.getInstruction(), getOperandValue(*CS.arg_begin(), SF), SF);
return;
default:
BasicBlock::iterator me(CS.getInstruction());
BasicBlock *Parent = CS.getInstruction()->getParent();
bool atBegin(Parent->begin() == me);
if (!atBegin)
--me;
IL->LowerIntrinsicCall(cast<CallInst>(CS.getInstruction()));
if (atBegin) {
SF.CurInst = Parent->begin();
} else {
SF.CurInst = me;
++SF.CurInst;
}
return;
}
SF.Caller = CS;
std::vector<GenericValue> ArgVals;
const unsigned NumArgs = SF.Caller.arg_size();
ArgVals.reserve(NumArgs);
uint16_t pNum = 1;
for (CallSite::arg_iterator i = SF.Caller.arg_begin(),
e = SF.Caller.arg_end(); i != e; ++i, ++pNum) {
Value *V = *i;
ArgVals.push_back(getOperandValue(V, SF));
}
GenericValue SRC = getOperandValue(SF.Caller.getCalledValue(), SF);
callFunction((Function*)GVTOP(SRC), ArgVals);
}
void Interpreter::visitShl(BinaryOperator &I) {
ExecutionContext &SF = ECStack.back();
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue Dest;
if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue());
else
Dest.IntVal = Src1.IntVal;
SetValue(&I, Dest, SF);
}
void Interpreter::visitLShr(BinaryOperator &I) {
ExecutionContext &SF = ECStack.back();
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue Dest;
if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue());
else
Dest.IntVal = Src1.IntVal;
SetValue(&I, Dest, SF);
}
void Interpreter::visitAShr(BinaryOperator &I) {
ExecutionContext &SF = ECStack.back();
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue Dest;
if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue());
else
Dest.IntVal = Src1.IntVal;
SetValue(&I, Dest, SF);
}
GenericValue Interpreter::executeTruncInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
IntegerType *DITy = cast<IntegerType>(DstTy);
unsigned DBitWidth = DITy->getBitWidth();
Dest.IntVal = Src.IntVal.trunc(DBitWidth);
return Dest;
}
GenericValue Interpreter::executeSExtInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
IntegerType *DITy = cast<IntegerType>(DstTy);
unsigned DBitWidth = DITy->getBitWidth();
Dest.IntVal = Src.IntVal.sext(DBitWidth);
return Dest;
}
GenericValue Interpreter::executeZExtInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
IntegerType *DITy = cast<IntegerType>(DstTy);
unsigned DBitWidth = DITy->getBitWidth();
Dest.IntVal = Src.IntVal.zext(DBitWidth);
return Dest;
}
GenericValue Interpreter::executeFPTruncInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
assert(SrcVal->getType()->isDoubleTy() && DstTy->isFloatTy() &&
"Invalid FPTrunc instruction");
Dest.FloatVal = (float) Src.DoubleVal;
return Dest;
}
GenericValue Interpreter::executeFPExtInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
assert(SrcVal->getType()->isFloatTy() && DstTy->isDoubleTy() &&
"Invalid FPTrunc instruction");
Dest.DoubleVal = (double) Src.FloatVal;
return Dest;
}
GenericValue Interpreter::executeFPToUIInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
Type *SrcTy = SrcVal->getType();
uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
assert(SrcTy->isFloatingPointTy() && "Invalid FPToUI instruction");
if (SrcTy->getTypeID() == Type::FloatTyID)
Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth);
else
Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth);
return Dest;
}
GenericValue Interpreter::executeFPToSIInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
Type *SrcTy = SrcVal->getType();
uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
assert(SrcTy->isFloatingPointTy() && "Invalid FPToSI instruction");
if (SrcTy->getTypeID() == Type::FloatTyID)
Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth);
else
Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth);
return Dest;
}
GenericValue Interpreter::executeUIToFPInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
assert(DstTy->isFloatingPointTy() && "Invalid UIToFP instruction");
if (DstTy->getTypeID() == Type::FloatTyID)
Dest.FloatVal = APIntOps::RoundAPIntToFloat(Src.IntVal);
else
Dest.DoubleVal = APIntOps::RoundAPIntToDouble(Src.IntVal);
return Dest;
}
GenericValue Interpreter::executeSIToFPInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
assert(DstTy->isFloatingPointTy() && "Invalid SIToFP instruction");
if (DstTy->getTypeID() == Type::FloatTyID)
Dest.FloatVal = APIntOps::RoundSignedAPIntToFloat(Src.IntVal);
else
Dest.DoubleVal = APIntOps::RoundSignedAPIntToDouble(Src.IntVal);
return Dest;
}
GenericValue Interpreter::executePtrToIntInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
assert(SrcVal->getType()->isPointerTy() && "Invalid PtrToInt instruction");
Dest.IntVal = APInt(DBitWidth, (intptr_t) Src.PointerVal);
return Dest;
}
GenericValue Interpreter::executeIntToPtrInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
assert(DstTy->isPointerTy() && "Invalid PtrToInt instruction");
uint32_t PtrSize = TD.getPointerSizeInBits();
if (PtrSize != Src.IntVal.getBitWidth())
Src.IntVal = Src.IntVal.zextOrTrunc(PtrSize);
Dest.PointerVal = PointerTy(intptr_t(Src.IntVal.getZExtValue()));
return Dest;
}
GenericValue Interpreter::executeBitCastInst(Value *SrcVal, Type *DstTy,
ExecutionContext &SF) {
Type *SrcTy = SrcVal->getType();
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
if (DstTy->isPointerTy()) {
assert(SrcTy->isPointerTy() && "Invalid BitCast");
Dest.PointerVal = Src.PointerVal;
} else if (DstTy->isIntegerTy()) {
if (SrcTy->isFloatTy()) {
Dest.IntVal = APInt::floatToBits(Src.FloatVal);
} else if (SrcTy->isDoubleTy()) {
Dest.IntVal = APInt::doubleToBits(Src.DoubleVal);
} else if (SrcTy->isIntegerTy()) {
Dest.IntVal = Src.IntVal;
} else
llvm_unreachable("Invalid BitCast");
} else if (DstTy->isFloatTy()) {
if (SrcTy->isIntegerTy())
Dest.FloatVal = Src.IntVal.bitsToFloat();
else
Dest.FloatVal = Src.FloatVal;
} else if (DstTy->isDoubleTy()) {
if (SrcTy->isIntegerTy())
Dest.DoubleVal = Src.IntVal.bitsToDouble();
else
Dest.DoubleVal = Src.DoubleVal;
} else
llvm_unreachable("Invalid Bitcast");
return Dest;
}
void Interpreter::visitTruncInst(TruncInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeTruncInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitSExtInst(SExtInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeSExtInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitZExtInst(ZExtInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeZExtInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitFPTruncInst(FPTruncInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeFPTruncInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitFPExtInst(FPExtInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeFPExtInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitUIToFPInst(UIToFPInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeUIToFPInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitSIToFPInst(SIToFPInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeSIToFPInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitFPToUIInst(FPToUIInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeFPToUIInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitFPToSIInst(FPToSIInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeFPToSIInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitPtrToIntInst(PtrToIntInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executePtrToIntInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitIntToPtrInst(IntToPtrInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeIntToPtrInst(I.getOperand(0), I.getType(), SF), SF);
}
void Interpreter::visitBitCastInst(BitCastInst &I) {
ExecutionContext &SF = ECStack.back();
SetValue(&I, executeBitCastInst(I.getOperand(0), I.getType(), SF), SF);
}
#define IMPLEMENT_VAARG(TY) \
case Type::TY##TyID: Dest.TY##Val = Src.TY##Val; break
void Interpreter::visitVAArgInst(VAArgInst &I) {
ExecutionContext &SF = ECStack.back();
GenericValue VAList = getOperandValue(I.getOperand(0), SF);
GenericValue Dest;
GenericValue Src = ECStack[VAList.UIntPairVal.first]
.VarArgs[VAList.UIntPairVal.second];
Type *Ty = I.getType();
switch (Ty->getTypeID()) {
case Type::IntegerTyID: Dest.IntVal = Src.IntVal;
IMPLEMENT_VAARG(Pointer);
IMPLEMENT_VAARG(Float);
IMPLEMENT_VAARG(Double);
default:
dbgs() << "Unhandled dest type for vaarg instruction: " << *Ty << "\n";
llvm_unreachable(0);
}
SetValue(&I, Dest, SF);
++VAList.UIntPairVal.second;
}
GenericValue Interpreter::getConstantExprValue (ConstantExpr *CE,
ExecutionContext &SF) {
switch (CE->getOpcode()) {
case Instruction::Trunc:
return executeTruncInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::ZExt:
return executeZExtInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::SExt:
return executeSExtInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::FPTrunc:
return executeFPTruncInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::FPExt:
return executeFPExtInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::UIToFP:
return executeUIToFPInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::SIToFP:
return executeSIToFPInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::FPToUI:
return executeFPToUIInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::FPToSI:
return executeFPToSIInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::PtrToInt:
return executePtrToIntInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::IntToPtr:
return executeIntToPtrInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::BitCast:
return executeBitCastInst(CE->getOperand(0), CE->getType(), SF);
case Instruction::GetElementPtr:
return executeGEPOperation(CE->getOperand(0), gep_type_begin(CE),
gep_type_end(CE), SF);
case Instruction::FCmp:
case Instruction::ICmp:
return executeCmpInst(CE->getPredicate(),
getOperandValue(CE->getOperand(0), SF),
getOperandValue(CE->getOperand(1), SF),
CE->getOperand(0)->getType());
case Instruction::Select:
return executeSelectInst(getOperandValue(CE->getOperand(0), SF),
getOperandValue(CE->getOperand(1), SF),
getOperandValue(CE->getOperand(2), SF));
default :
break;
}
GenericValue Op0 = getOperandValue(CE->getOperand(0), SF);
GenericValue Op1 = getOperandValue(CE->getOperand(1), SF);
GenericValue Dest;
Type * Ty = CE->getOperand(0)->getType();
switch (CE->getOpcode()) {
case Instruction::Add: Dest.IntVal = Op0.IntVal + Op1.IntVal; break;
case Instruction::Sub: Dest.IntVal = Op0.IntVal - Op1.IntVal; break;
case Instruction::Mul: Dest.IntVal = Op0.IntVal * Op1.IntVal; break;
case Instruction::FAdd: executeFAddInst(Dest, Op0, Op1, Ty); break;
case Instruction::FSub: executeFSubInst(Dest, Op0, Op1, Ty); break;
case Instruction::FMul: executeFMulInst(Dest, Op0, Op1, Ty); break;
case Instruction::FDiv: executeFDivInst(Dest, Op0, Op1, Ty); break;
case Instruction::FRem: executeFRemInst(Dest, Op0, Op1, Ty); break;
case Instruction::SDiv: Dest.IntVal = Op0.IntVal.sdiv(Op1.IntVal); break;
case Instruction::UDiv: Dest.IntVal = Op0.IntVal.udiv(Op1.IntVal); break;
case Instruction::URem: Dest.IntVal = Op0.IntVal.urem(Op1.IntVal); break;
case Instruction::SRem: Dest.IntVal = Op0.IntVal.srem(Op1.IntVal); break;
case Instruction::And: Dest.IntVal = Op0.IntVal & Op1.IntVal; break;
case Instruction::Or: Dest.IntVal = Op0.IntVal | Op1.IntVal; break;
case Instruction::Xor: Dest.IntVal = Op0.IntVal ^ Op1.IntVal; break;
case Instruction::Shl:
Dest.IntVal = Op0.IntVal.shl(Op1.IntVal.getZExtValue());
break;
case Instruction::LShr:
Dest.IntVal = Op0.IntVal.lshr(Op1.IntVal.getZExtValue());
break;
case Instruction::AShr:
Dest.IntVal = Op0.IntVal.ashr(Op1.IntVal.getZExtValue());
break;
default:
dbgs() << "Unhandled ConstantExpr: " << *CE << "\n";
llvm_unreachable("Unhandled ConstantExpr");
}
return Dest;
}
GenericValue Interpreter::getOperandValue(Value *V, ExecutionContext &SF) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
return getConstantExprValue(CE, SF);
} else if (Constant *CPV = dyn_cast<Constant>(V)) {
return getConstantValue(CPV);
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
return PTOGV(getPointerToGlobal(GV));
} else {
return SF.Values[V];
}
}
void Interpreter::callFunction(Function *F,
const std::vector<GenericValue> &ArgVals) {
assert((ECStack.empty() || ECStack.back().Caller.getInstruction() == 0 ||
ECStack.back().Caller.arg_size() == ArgVals.size()) &&
"Incorrect number of arguments passed into function call!");
ECStack.push_back(ExecutionContext());
ExecutionContext &StackFrame = ECStack.back();
StackFrame.CurFunction = F;
if (F->isDeclaration()) {
GenericValue Result = callExternalFunction (F, ArgVals);
popStackAndReturnValueToCaller (F->getReturnType (), Result);
return;
}
StackFrame.CurBB = F->begin();
StackFrame.CurInst = StackFrame.CurBB->begin();
assert((ArgVals.size() == F->arg_size() ||
(ArgVals.size() > F->arg_size() && F->getFunctionType()->isVarArg()))&&
"Invalid number of values passed to function invocation!");
unsigned i = 0;
for (Function::arg_iterator AI = F->arg_begin(), E = F->arg_end();
AI != E; ++AI, ++i)
SetValue(AI, ArgVals[i], StackFrame);
StackFrame.VarArgs.assign(ArgVals.begin()+i, ArgVals.end());
}
void Interpreter::run() {
while (!ECStack.empty()) {
ExecutionContext &SF = ECStack.back(); Instruction &I = *SF.CurInst++;
++NumDynamicInsts;
DEBUG(dbgs() << "About to interpret: " << I);
visit(I); #if 0
DEBUG(
if (!isa<CallInst>(I) && !isa<InvokeInst>(I) &&
I.getType() != Type::VoidTy) {
dbgs() << " --> ";
const GenericValue &Val = SF.Values[&I];
switch (I.getType()->getTypeID()) {
default: llvm_unreachable("Invalid GenericValue Type");
case Type::VoidTyID: dbgs() << "void"; break;
case Type::FloatTyID: dbgs() << "float " << Val.FloatVal; break;
case Type::DoubleTyID: dbgs() << "double " << Val.DoubleVal; break;
case Type::PointerTyID: dbgs() << "void* " << intptr_t(Val.PointerVal);
break;
case Type::IntegerTyID:
dbgs() << "i" << Val.IntVal.getBitWidth() << " "
<< Val.IntVal.toStringUnsigned(10)
<< " (0x" << Val.IntVal.toStringUnsigned(16) << ")\n";
break;
}
});
#endif
}
}