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//===-- Execution.cpp - Implement code to simulate the program ------------===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This file contains the actual instruction interpreter.
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "interpreter"
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#include "Interpreter.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Instructions.h"
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#include "llvm/CodeGen/IntrinsicLowering.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/ADT/APInt.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed");
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static cl::opt<bool> PrintVolatile("interpreter-print-volatile", cl::Hidden,
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cl::desc("make the interpreter print every volatile load and store"));
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//===----------------------------------------------------------------------===//
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// Various Helper Functions
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//===----------------------------------------------------------------------===//
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static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) {
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//===----------------------------------------------------------------------===//
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// Binary Instruction Implementations
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//===----------------------------------------------------------------------===//
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#define IMPLEMENT_BINARY_OPERATOR(OP, TY) \
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case Type::TY##TyID: \
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Dest.TY##Val = Src1.TY##Val OP Src2.TY##Val; \
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static void executeFAddInst(GenericValue &Dest, GenericValue Src1,
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GenericValue Src2, const Type *Ty) {
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switch (Ty->getTypeID()) {
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IMPLEMENT_BINARY_OPERATOR(+, Float);
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IMPLEMENT_BINARY_OPERATOR(+, Double);
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dbgs() << "Unhandled type for FAdd instruction: " << *Ty << "\n";
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static void executeFSubInst(GenericValue &Dest, GenericValue Src1,
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GenericValue Src2, const Type *Ty) {
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switch (Ty->getTypeID()) {
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IMPLEMENT_BINARY_OPERATOR(-, Float);
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IMPLEMENT_BINARY_OPERATOR(-, Double);
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dbgs() << "Unhandled type for FSub instruction: " << *Ty << "\n";
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static void executeFMulInst(GenericValue &Dest, GenericValue Src1,
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GenericValue Src2, const Type *Ty) {
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switch (Ty->getTypeID()) {
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IMPLEMENT_BINARY_OPERATOR(*, Float);
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IMPLEMENT_BINARY_OPERATOR(*, Double);
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dbgs() << "Unhandled type for FMul instruction: " << *Ty << "\n";
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static void executeFDivInst(GenericValue &Dest, GenericValue Src1,
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GenericValue Src2, const Type *Ty) {
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switch (Ty->getTypeID()) {
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IMPLEMENT_BINARY_OPERATOR(/, Float);
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IMPLEMENT_BINARY_OPERATOR(/, Double);
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dbgs() << "Unhandled type for FDiv instruction: " << *Ty << "\n";
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static void executeFRemInst(GenericValue &Dest, GenericValue Src1,
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GenericValue Src2, const Type *Ty) {
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switch (Ty->getTypeID()) {
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case Type::FloatTyID:
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Dest.FloatVal = fmod(Src1.FloatVal, Src2.FloatVal);
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case Type::DoubleTyID:
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Dest.DoubleVal = fmod(Src1.DoubleVal, Src2.DoubleVal);
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dbgs() << "Unhandled type for Rem instruction: " << *Ty << "\n";
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#define IMPLEMENT_INTEGER_ICMP(OP, TY) \
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case Type::IntegerTyID: \
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Dest.IntVal = APInt(1,Src1.IntVal.OP(Src2.IntVal)); \
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// Handle pointers specially because they must be compared with only as much
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// width as the host has. We _do not_ want to be comparing 64 bit values when
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// running on a 32-bit target, otherwise the upper 32 bits might mess up
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// comparisons if they contain garbage.
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#define IMPLEMENT_POINTER_ICMP(OP) \
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case Type::PointerTyID: \
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Dest.IntVal = APInt(1,(void*)(intptr_t)Src1.PointerVal OP \
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(void*)(intptr_t)Src2.PointerVal); \
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static GenericValue executeICMP_EQ(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(eq,Ty);
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IMPLEMENT_POINTER_ICMP(==);
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dbgs() << "Unhandled type for ICMP_EQ predicate: " << *Ty << "\n";
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static GenericValue executeICMP_NE(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(ne,Ty);
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IMPLEMENT_POINTER_ICMP(!=);
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dbgs() << "Unhandled type for ICMP_NE predicate: " << *Ty << "\n";
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static GenericValue executeICMP_ULT(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(ult,Ty);
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IMPLEMENT_POINTER_ICMP(<);
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dbgs() << "Unhandled type for ICMP_ULT predicate: " << *Ty << "\n";
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static GenericValue executeICMP_SLT(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(slt,Ty);
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IMPLEMENT_POINTER_ICMP(<);
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dbgs() << "Unhandled type for ICMP_SLT predicate: " << *Ty << "\n";
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static GenericValue executeICMP_UGT(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(ugt,Ty);
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IMPLEMENT_POINTER_ICMP(>);
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dbgs() << "Unhandled type for ICMP_UGT predicate: " << *Ty << "\n";
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static GenericValue executeICMP_SGT(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(sgt,Ty);
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IMPLEMENT_POINTER_ICMP(>);
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dbgs() << "Unhandled type for ICMP_SGT predicate: " << *Ty << "\n";
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static GenericValue executeICMP_ULE(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(ule,Ty);
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IMPLEMENT_POINTER_ICMP(<=);
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dbgs() << "Unhandled type for ICMP_ULE predicate: " << *Ty << "\n";
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static GenericValue executeICMP_SLE(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(sle,Ty);
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IMPLEMENT_POINTER_ICMP(<=);
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dbgs() << "Unhandled type for ICMP_SLE predicate: " << *Ty << "\n";
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static GenericValue executeICMP_UGE(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(uge,Ty);
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IMPLEMENT_POINTER_ICMP(>=);
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dbgs() << "Unhandled type for ICMP_UGE predicate: " << *Ty << "\n";
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static GenericValue executeICMP_SGE(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_INTEGER_ICMP(sge,Ty);
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IMPLEMENT_POINTER_ICMP(>=);
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dbgs() << "Unhandled type for ICMP_SGE predicate: " << *Ty << "\n";
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void Interpreter::visitICmpInst(ICmpInst &I) {
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ExecutionContext &SF = ECStack.back();
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const Type *Ty = I.getOperand(0)->getType();
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GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
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GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
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GenericValue R; // Result
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switch (I.getPredicate()) {
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case ICmpInst::ICMP_EQ: R = executeICMP_EQ(Src1, Src2, Ty); break;
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case ICmpInst::ICMP_NE: R = executeICMP_NE(Src1, Src2, Ty); break;
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case ICmpInst::ICMP_ULT: R = executeICMP_ULT(Src1, Src2, Ty); break;
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case ICmpInst::ICMP_SLT: R = executeICMP_SLT(Src1, Src2, Ty); break;
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case ICmpInst::ICMP_UGT: R = executeICMP_UGT(Src1, Src2, Ty); break;
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case ICmpInst::ICMP_SGT: R = executeICMP_SGT(Src1, Src2, Ty); break;
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case ICmpInst::ICMP_ULE: R = executeICMP_ULE(Src1, Src2, Ty); break;
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case ICmpInst::ICMP_SLE: R = executeICMP_SLE(Src1, Src2, Ty); break;
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case ICmpInst::ICMP_UGE: R = executeICMP_UGE(Src1, Src2, Ty); break;
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case ICmpInst::ICMP_SGE: R = executeICMP_SGE(Src1, Src2, Ty); break;
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dbgs() << "Don't know how to handle this ICmp predicate!\n-->" << I;
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#define IMPLEMENT_FCMP(OP, TY) \
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case Type::TY##TyID: \
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Dest.IntVal = APInt(1,Src1.TY##Val OP Src2.TY##Val); \
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static GenericValue executeFCMP_OEQ(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_FCMP(==, Float);
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IMPLEMENT_FCMP(==, Double);
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dbgs() << "Unhandled type for FCmp EQ instruction: " << *Ty << "\n";
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static GenericValue executeFCMP_ONE(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_FCMP(!=, Float);
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IMPLEMENT_FCMP(!=, Double);
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dbgs() << "Unhandled type for FCmp NE instruction: " << *Ty << "\n";
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static GenericValue executeFCMP_OLE(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_FCMP(<=, Float);
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IMPLEMENT_FCMP(<=, Double);
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dbgs() << "Unhandled type for FCmp LE instruction: " << *Ty << "\n";
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static GenericValue executeFCMP_OGE(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_FCMP(>=, Float);
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IMPLEMENT_FCMP(>=, Double);
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dbgs() << "Unhandled type for FCmp GE instruction: " << *Ty << "\n";
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static GenericValue executeFCMP_OLT(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_FCMP(<, Float);
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IMPLEMENT_FCMP(<, Double);
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dbgs() << "Unhandled type for FCmp LT instruction: " << *Ty << "\n";
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static GenericValue executeFCMP_OGT(GenericValue Src1, GenericValue Src2,
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switch (Ty->getTypeID()) {
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IMPLEMENT_FCMP(>, Float);
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IMPLEMENT_FCMP(>, Double);
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dbgs() << "Unhandled type for FCmp GT instruction: " << *Ty << "\n";
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#define IMPLEMENT_UNORDERED(TY, X,Y) \
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if (TY->isFloatTy()) { \
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if (X.FloatVal != X.FloatVal || Y.FloatVal != Y.FloatVal) { \
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Dest.IntVal = APInt(1,true); \
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} else if (X.DoubleVal != X.DoubleVal || Y.DoubleVal != Y.DoubleVal) { \
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Dest.IntVal = APInt(1,true); \
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static GenericValue executeFCMP_UEQ(GenericValue Src1, GenericValue Src2,
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IMPLEMENT_UNORDERED(Ty, Src1, Src2)
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return executeFCMP_OEQ(Src1, Src2, Ty);
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static GenericValue executeFCMP_UNE(GenericValue Src1, GenericValue Src2,
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IMPLEMENT_UNORDERED(Ty, Src1, Src2)
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return executeFCMP_ONE(Src1, Src2, Ty);
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static GenericValue executeFCMP_ULE(GenericValue Src1, GenericValue Src2,
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IMPLEMENT_UNORDERED(Ty, Src1, Src2)
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return executeFCMP_OLE(Src1, Src2, Ty);
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static GenericValue executeFCMP_UGE(GenericValue Src1, GenericValue Src2,
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IMPLEMENT_UNORDERED(Ty, Src1, Src2)
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return executeFCMP_OGE(Src1, Src2, Ty);
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static GenericValue executeFCMP_ULT(GenericValue Src1, GenericValue Src2,
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IMPLEMENT_UNORDERED(Ty, Src1, Src2)
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return executeFCMP_OLT(Src1, Src2, Ty);
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static GenericValue executeFCMP_UGT(GenericValue Src1, GenericValue Src2,
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IMPLEMENT_UNORDERED(Ty, Src1, Src2)
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return executeFCMP_OGT(Src1, Src2, Ty);
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static GenericValue executeFCMP_ORD(GenericValue Src1, GenericValue Src2,
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Dest.IntVal = APInt(1,(Src1.FloatVal == Src1.FloatVal &&
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Src2.FloatVal == Src2.FloatVal));
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Dest.IntVal = APInt(1,(Src1.DoubleVal == Src1.DoubleVal &&
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Src2.DoubleVal == Src2.DoubleVal));
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static GenericValue executeFCMP_UNO(GenericValue Src1, GenericValue Src2,
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Dest.IntVal = APInt(1,(Src1.FloatVal != Src1.FloatVal ||
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Src2.FloatVal != Src2.FloatVal));
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Dest.IntVal = APInt(1,(Src1.DoubleVal != Src1.DoubleVal ||
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Src2.DoubleVal != Src2.DoubleVal));
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void Interpreter::visitFCmpInst(FCmpInst &I) {
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ExecutionContext &SF = ECStack.back();
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const Type *Ty = I.getOperand(0)->getType();
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GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
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GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
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GenericValue R; // Result
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switch (I.getPredicate()) {
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case FCmpInst::FCMP_FALSE: R.IntVal = APInt(1,false); break;
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case FCmpInst::FCMP_TRUE: R.IntVal = APInt(1,true); break;
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case FCmpInst::FCMP_ORD: R = executeFCMP_ORD(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_UNO: R = executeFCMP_UNO(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_UEQ: R = executeFCMP_UEQ(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_OEQ: R = executeFCMP_OEQ(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_UNE: R = executeFCMP_UNE(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_ONE: R = executeFCMP_ONE(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_ULT: R = executeFCMP_ULT(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_OLT: R = executeFCMP_OLT(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_UGT: R = executeFCMP_UGT(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_OGT: R = executeFCMP_OGT(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_ULE: R = executeFCMP_ULE(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_OLE: R = executeFCMP_OLE(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_UGE: R = executeFCMP_UGE(Src1, Src2, Ty); break;
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case FCmpInst::FCMP_OGE: R = executeFCMP_OGE(Src1, Src2, Ty); break;
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dbgs() << "Don't know how to handle this FCmp predicate!\n-->" << I;
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static GenericValue executeCmpInst(unsigned predicate, GenericValue Src1,
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GenericValue Src2, const Type *Ty) {
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case ICmpInst::ICMP_EQ: return executeICMP_EQ(Src1, Src2, Ty);
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case ICmpInst::ICMP_NE: return executeICMP_NE(Src1, Src2, Ty);
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case ICmpInst::ICMP_UGT: return executeICMP_UGT(Src1, Src2, Ty);
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case ICmpInst::ICMP_SGT: return executeICMP_SGT(Src1, Src2, Ty);
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case ICmpInst::ICMP_ULT: return executeICMP_ULT(Src1, Src2, Ty);
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case ICmpInst::ICMP_SLT: return executeICMP_SLT(Src1, Src2, Ty);
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case ICmpInst::ICMP_UGE: return executeICMP_UGE(Src1, Src2, Ty);
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case ICmpInst::ICMP_SGE: return executeICMP_SGE(Src1, Src2, Ty);
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case ICmpInst::ICMP_ULE: return executeICMP_ULE(Src1, Src2, Ty);
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case ICmpInst::ICMP_SLE: return executeICMP_SLE(Src1, Src2, Ty);
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case FCmpInst::FCMP_ORD: return executeFCMP_ORD(Src1, Src2, Ty);
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case FCmpInst::FCMP_UNO: return executeFCMP_UNO(Src1, Src2, Ty);
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case FCmpInst::FCMP_OEQ: return executeFCMP_OEQ(Src1, Src2, Ty);
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case FCmpInst::FCMP_UEQ: return executeFCMP_UEQ(Src1, Src2, Ty);
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case FCmpInst::FCMP_ONE: return executeFCMP_ONE(Src1, Src2, Ty);
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case FCmpInst::FCMP_UNE: return executeFCMP_UNE(Src1, Src2, Ty);
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case FCmpInst::FCMP_OLT: return executeFCMP_OLT(Src1, Src2, Ty);
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case FCmpInst::FCMP_ULT: return executeFCMP_ULT(Src1, Src2, Ty);
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case FCmpInst::FCMP_OGT: return executeFCMP_OGT(Src1, Src2, Ty);
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case FCmpInst::FCMP_UGT: return executeFCMP_UGT(Src1, Src2, Ty);
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case FCmpInst::FCMP_OLE: return executeFCMP_OLE(Src1, Src2, Ty);
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case FCmpInst::FCMP_ULE: return executeFCMP_ULE(Src1, Src2, Ty);
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case FCmpInst::FCMP_OGE: return executeFCMP_OGE(Src1, Src2, Ty);
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case FCmpInst::FCMP_UGE: return executeFCMP_UGE(Src1, Src2, Ty);
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case FCmpInst::FCMP_FALSE: {
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Result.IntVal = APInt(1, false);
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case FCmpInst::FCMP_TRUE: {
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Result.IntVal = APInt(1, true);
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dbgs() << "Unhandled Cmp predicate\n";
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void Interpreter::visitBinaryOperator(BinaryOperator &I) {
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ExecutionContext &SF = ECStack.back();
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const Type *Ty = I.getOperand(0)->getType();
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GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
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GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
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GenericValue R; // Result
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switch (I.getOpcode()) {
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case Instruction::Add: R.IntVal = Src1.IntVal + Src2.IntVal; break;
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case Instruction::Sub: R.IntVal = Src1.IntVal - Src2.IntVal; break;
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case Instruction::Mul: R.IntVal = Src1.IntVal * Src2.IntVal; break;
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case Instruction::FAdd: executeFAddInst(R, Src1, Src2, Ty); break;
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case Instruction::FSub: executeFSubInst(R, Src1, Src2, Ty); break;
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case Instruction::FMul: executeFMulInst(R, Src1, Src2, Ty); break;
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case Instruction::FDiv: executeFDivInst(R, Src1, Src2, Ty); break;
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case Instruction::FRem: executeFRemInst(R, Src1, Src2, Ty); break;
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case Instruction::UDiv: R.IntVal = Src1.IntVal.udiv(Src2.IntVal); break;
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case Instruction::SDiv: R.IntVal = Src1.IntVal.sdiv(Src2.IntVal); break;
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case Instruction::URem: R.IntVal = Src1.IntVal.urem(Src2.IntVal); break;
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case Instruction::SRem: R.IntVal = Src1.IntVal.srem(Src2.IntVal); break;
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case Instruction::And: R.IntVal = Src1.IntVal & Src2.IntVal; break;
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case Instruction::Or: R.IntVal = Src1.IntVal | Src2.IntVal; break;
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case Instruction::Xor: R.IntVal = Src1.IntVal ^ Src2.IntVal; break;
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dbgs() << "Don't know how to handle this binary operator!\n-->" << I;
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static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2,
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return Src1.IntVal == 0 ? Src3 : Src2;
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void Interpreter::visitSelectInst(SelectInst &I) {
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ExecutionContext &SF = ECStack.back();
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GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
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GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
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GenericValue Src3 = getOperandValue(I.getOperand(2), SF);
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GenericValue R = executeSelectInst(Src1, Src2, Src3);
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//===----------------------------------------------------------------------===//
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// Terminator Instruction Implementations
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//===----------------------------------------------------------------------===//
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void Interpreter::exitCalled(GenericValue GV) {
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// runAtExitHandlers() assumes there are no stack frames, but
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// if exit() was called, then it had a stack frame. Blow away
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// the stack before interpreting atexit handlers.
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exit(GV.IntVal.zextOrTrunc(32).getZExtValue());
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/// Pop the last stack frame off of ECStack and then copy the result
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/// back into the result variable if we are not returning void. The
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/// result variable may be the ExitValue, or the Value of the calling
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/// CallInst if there was a previous stack frame. This method may
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/// invalidate any ECStack iterators you have. This method also takes
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/// care of switching to the normal destination BB, if we are returning
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void Interpreter::popStackAndReturnValueToCaller(const Type *RetTy,
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GenericValue Result) {
590
// Pop the current stack frame.
593
if (ECStack.empty()) { // Finished main. Put result into exit code...
594
if (RetTy && RetTy->isIntegerTy()) { // Nonvoid return type?
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ExitValue = Result; // Capture the exit value of the program
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memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
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// If we have a previous stack frame, and we have a previous call,
601
// fill in the return value...
602
ExecutionContext &CallingSF = ECStack.back();
603
if (Instruction *I = CallingSF.Caller.getInstruction()) {
605
if (!CallingSF.Caller.getType()->isVoidTy())
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SetValue(I, Result, CallingSF);
607
if (InvokeInst *II = dyn_cast<InvokeInst> (I))
608
SwitchToNewBasicBlock (II->getNormalDest (), CallingSF);
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CallingSF.Caller = CallSite(); // We returned from the call...
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void Interpreter::visitReturnInst(ReturnInst &I) {
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ExecutionContext &SF = ECStack.back();
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const Type *RetTy = Type::getVoidTy(I.getContext());
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// Save away the return value... (if we are not 'ret void')
620
if (I.getNumOperands()) {
621
RetTy = I.getReturnValue()->getType();
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Result = getOperandValue(I.getReturnValue(), SF);
625
popStackAndReturnValueToCaller(RetTy, Result);
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void Interpreter::visitUnwindInst(UnwindInst &I) {
634
llvm_report_error("Empty stack during unwind!");
635
Inst = ECStack.back().Caller.getInstruction();
636
} while (!(Inst && isa<InvokeInst>(Inst)));
638
// Return from invoke
639
ExecutionContext &InvokingSF = ECStack.back();
640
InvokingSF.Caller = CallSite();
642
// Go to exceptional destination BB of invoke instruction
643
SwitchToNewBasicBlock(cast<InvokeInst>(Inst)->getUnwindDest(), InvokingSF);
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void Interpreter::visitUnreachableInst(UnreachableInst &I) {
647
llvm_report_error("Program executed an 'unreachable' instruction!");
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void Interpreter::visitBranchInst(BranchInst &I) {
651
ExecutionContext &SF = ECStack.back();
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Dest = I.getSuccessor(0); // Uncond branches have a fixed dest...
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if (!I.isUnconditional()) {
656
Value *Cond = I.getCondition();
657
if (getOperandValue(Cond, SF).IntVal == 0) // If false cond...
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Dest = I.getSuccessor(1);
660
SwitchToNewBasicBlock(Dest, SF);
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void Interpreter::visitSwitchInst(SwitchInst &I) {
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ExecutionContext &SF = ECStack.back();
665
GenericValue CondVal = getOperandValue(I.getOperand(0), SF);
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const Type *ElTy = I.getOperand(0)->getType();
668
// Check to see if any of the cases match...
669
BasicBlock *Dest = 0;
670
for (unsigned i = 2, e = I.getNumOperands(); i != e; i += 2)
671
if (executeICMP_EQ(CondVal, getOperandValue(I.getOperand(i), SF), ElTy)
673
Dest = cast<BasicBlock>(I.getOperand(i+1));
677
if (!Dest) Dest = I.getDefaultDest(); // No cases matched: use default
678
SwitchToNewBasicBlock(Dest, SF);
681
void Interpreter::visitIndirectBrInst(IndirectBrInst &I) {
682
ExecutionContext &SF = ECStack.back();
683
void *Dest = GVTOP(getOperandValue(I.getAddress(), SF));
684
SwitchToNewBasicBlock((BasicBlock*)Dest, SF);
688
// SwitchToNewBasicBlock - This method is used to jump to a new basic block.
689
// This function handles the actual updating of block and instruction iterators
690
// as well as execution of all of the PHI nodes in the destination block.
692
// This method does this because all of the PHI nodes must be executed
693
// atomically, reading their inputs before any of the results are updated. Not
694
// doing this can cause problems if the PHI nodes depend on other PHI nodes for
695
// their inputs. If the input PHI node is updated before it is read, incorrect
696
// results can happen. Thus we use a two phase approach.
698
void Interpreter::SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF){
699
BasicBlock *PrevBB = SF.CurBB; // Remember where we came from...
700
SF.CurBB = Dest; // Update CurBB to branch destination
701
SF.CurInst = SF.CurBB->begin(); // Update new instruction ptr...
703
if (!isa<PHINode>(SF.CurInst)) return; // Nothing fancy to do
705
// Loop over all of the PHI nodes in the current block, reading their inputs.
706
std::vector<GenericValue> ResultValues;
708
for (; PHINode *PN = dyn_cast<PHINode>(SF.CurInst); ++SF.CurInst) {
709
// Search for the value corresponding to this previous bb...
710
int i = PN->getBasicBlockIndex(PrevBB);
711
assert(i != -1 && "PHINode doesn't contain entry for predecessor??");
712
Value *IncomingValue = PN->getIncomingValue(i);
714
// Save the incoming value for this PHI node...
715
ResultValues.push_back(getOperandValue(IncomingValue, SF));
718
// Now loop over all of the PHI nodes setting their values...
719
SF.CurInst = SF.CurBB->begin();
720
for (unsigned i = 0; isa<PHINode>(SF.CurInst); ++SF.CurInst, ++i) {
721
PHINode *PN = cast<PHINode>(SF.CurInst);
722
SetValue(PN, ResultValues[i], SF);
726
//===----------------------------------------------------------------------===//
727
// Memory Instruction Implementations
728
//===----------------------------------------------------------------------===//
730
void Interpreter::visitAllocaInst(AllocaInst &I) {
731
ExecutionContext &SF = ECStack.back();
733
const Type *Ty = I.getType()->getElementType(); // Type to be allocated
735
// Get the number of elements being allocated by the array...
736
unsigned NumElements =
737
getOperandValue(I.getOperand(0), SF).IntVal.getZExtValue();
739
unsigned TypeSize = (size_t)TD.getTypeAllocSize(Ty);
741
// Avoid malloc-ing zero bytes, use max()...
742
unsigned MemToAlloc = std::max(1U, NumElements * TypeSize);
744
// Allocate enough memory to hold the type...
745
void *Memory = malloc(MemToAlloc);
747
DEBUG(dbgs() << "Allocated Type: " << *Ty << " (" << TypeSize << " bytes) x "
748
<< NumElements << " (Total: " << MemToAlloc << ") at "
749
<< uintptr_t(Memory) << '\n');
751
GenericValue Result = PTOGV(Memory);
752
assert(Result.PointerVal != 0 && "Null pointer returned by malloc!");
753
SetValue(&I, Result, SF);
755
if (I.getOpcode() == Instruction::Alloca)
756
ECStack.back().Allocas.add(Memory);
759
// getElementOffset - The workhorse for getelementptr.
761
GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I,
763
ExecutionContext &SF) {
764
assert(Ptr->getType()->isPointerTy() &&
765
"Cannot getElementOffset of a nonpointer type!");
769
for (; I != E; ++I) {
770
if (const StructType *STy = dyn_cast<StructType>(*I)) {
771
const StructLayout *SLO = TD.getStructLayout(STy);
773
const ConstantInt *CPU = cast<ConstantInt>(I.getOperand());
774
unsigned Index = unsigned(CPU->getZExtValue());
776
Total += SLO->getElementOffset(Index);
778
const SequentialType *ST = cast<SequentialType>(*I);
779
// Get the index number for the array... which must be long type...
780
GenericValue IdxGV = getOperandValue(I.getOperand(), SF);
784
cast<IntegerType>(I.getOperand()->getType())->getBitWidth();
786
Idx = (int64_t)(int32_t)IdxGV.IntVal.getZExtValue();
788
assert(BitWidth == 64 && "Invalid index type for getelementptr");
789
Idx = (int64_t)IdxGV.IntVal.getZExtValue();
791
Total += TD.getTypeAllocSize(ST->getElementType())*Idx;
796
Result.PointerVal = ((char*)getOperandValue(Ptr, SF).PointerVal) + Total;
797
DEBUG(dbgs() << "GEP Index " << Total << " bytes.\n");
801
void Interpreter::visitGetElementPtrInst(GetElementPtrInst &I) {
802
ExecutionContext &SF = ECStack.back();
803
SetValue(&I, executeGEPOperation(I.getPointerOperand(),
804
gep_type_begin(I), gep_type_end(I), SF), SF);
807
void Interpreter::visitLoadInst(LoadInst &I) {
808
ExecutionContext &SF = ECStack.back();
809
GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
810
GenericValue *Ptr = (GenericValue*)GVTOP(SRC);
812
LoadValueFromMemory(Result, Ptr, I.getType());
813
SetValue(&I, Result, SF);
814
if (I.isVolatile() && PrintVolatile)
815
dbgs() << "Volatile load " << I;
818
void Interpreter::visitStoreInst(StoreInst &I) {
819
ExecutionContext &SF = ECStack.back();
820
GenericValue Val = getOperandValue(I.getOperand(0), SF);
821
GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
822
StoreValueToMemory(Val, (GenericValue *)GVTOP(SRC),
823
I.getOperand(0)->getType());
824
if (I.isVolatile() && PrintVolatile)
825
dbgs() << "Volatile store: " << I;
828
//===----------------------------------------------------------------------===//
829
// Miscellaneous Instruction Implementations
830
//===----------------------------------------------------------------------===//
832
void Interpreter::visitCallSite(CallSite CS) {
833
ExecutionContext &SF = ECStack.back();
835
// Check to see if this is an intrinsic function call...
836
Function *F = CS.getCalledFunction();
837
if (F && F->isDeclaration())
838
switch (F->getIntrinsicID()) {
839
case Intrinsic::not_intrinsic:
841
case Intrinsic::vastart: { // va_start
842
GenericValue ArgIndex;
843
ArgIndex.UIntPairVal.first = ECStack.size() - 1;
844
ArgIndex.UIntPairVal.second = 0;
845
SetValue(CS.getInstruction(), ArgIndex, SF);
848
case Intrinsic::vaend: // va_end is a noop for the interpreter
850
case Intrinsic::vacopy: // va_copy: dest = src
851
SetValue(CS.getInstruction(), getOperandValue(*CS.arg_begin(), SF), SF);
854
// If it is an unknown intrinsic function, use the intrinsic lowering
855
// class to transform it into hopefully tasty LLVM code.
857
BasicBlock::iterator me(CS.getInstruction());
858
BasicBlock *Parent = CS.getInstruction()->getParent();
859
bool atBegin(Parent->begin() == me);
862
IL->LowerIntrinsicCall(cast<CallInst>(CS.getInstruction()));
864
// Restore the CurInst pointer to the first instruction newly inserted, if
867
SF.CurInst = Parent->begin();
877
std::vector<GenericValue> ArgVals;
878
const unsigned NumArgs = SF.Caller.arg_size();
879
ArgVals.reserve(NumArgs);
881
for (CallSite::arg_iterator i = SF.Caller.arg_begin(),
882
e = SF.Caller.arg_end(); i != e; ++i, ++pNum) {
884
ArgVals.push_back(getOperandValue(V, SF));
887
// To handle indirect calls, we must get the pointer value from the argument
888
// and treat it as a function pointer.
889
GenericValue SRC = getOperandValue(SF.Caller.getCalledValue(), SF);
890
callFunction((Function*)GVTOP(SRC), ArgVals);
893
void Interpreter::visitShl(BinaryOperator &I) {
894
ExecutionContext &SF = ECStack.back();
895
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
896
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
898
if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
899
Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue());
901
Dest.IntVal = Src1.IntVal;
903
SetValue(&I, Dest, SF);
906
void Interpreter::visitLShr(BinaryOperator &I) {
907
ExecutionContext &SF = ECStack.back();
908
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
909
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
911
if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
912
Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue());
914
Dest.IntVal = Src1.IntVal;
916
SetValue(&I, Dest, SF);
919
void Interpreter::visitAShr(BinaryOperator &I) {
920
ExecutionContext &SF = ECStack.back();
921
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
922
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
924
if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
925
Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue());
927
Dest.IntVal = Src1.IntVal;
929
SetValue(&I, Dest, SF);
932
GenericValue Interpreter::executeTruncInst(Value *SrcVal, const Type *DstTy,
933
ExecutionContext &SF) {
934
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
935
const IntegerType *DITy = cast<IntegerType>(DstTy);
936
unsigned DBitWidth = DITy->getBitWidth();
937
Dest.IntVal = Src.IntVal.trunc(DBitWidth);
941
GenericValue Interpreter::executeSExtInst(Value *SrcVal, const Type *DstTy,
942
ExecutionContext &SF) {
943
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
944
const IntegerType *DITy = cast<IntegerType>(DstTy);
945
unsigned DBitWidth = DITy->getBitWidth();
946
Dest.IntVal = Src.IntVal.sext(DBitWidth);
950
GenericValue Interpreter::executeZExtInst(Value *SrcVal, const Type *DstTy,
951
ExecutionContext &SF) {
952
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
953
const IntegerType *DITy = cast<IntegerType>(DstTy);
954
unsigned DBitWidth = DITy->getBitWidth();
955
Dest.IntVal = Src.IntVal.zext(DBitWidth);
959
GenericValue Interpreter::executeFPTruncInst(Value *SrcVal, const Type *DstTy,
960
ExecutionContext &SF) {
961
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
962
assert(SrcVal->getType()->isDoubleTy() && DstTy->isFloatTy() &&
963
"Invalid FPTrunc instruction");
964
Dest.FloatVal = (float) Src.DoubleVal;
968
GenericValue Interpreter::executeFPExtInst(Value *SrcVal, const Type *DstTy,
969
ExecutionContext &SF) {
970
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
971
assert(SrcVal->getType()->isFloatTy() && DstTy->isDoubleTy() &&
972
"Invalid FPTrunc instruction");
973
Dest.DoubleVal = (double) Src.FloatVal;
977
GenericValue Interpreter::executeFPToUIInst(Value *SrcVal, const Type *DstTy,
978
ExecutionContext &SF) {
979
const Type *SrcTy = SrcVal->getType();
980
uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
981
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
982
assert(SrcTy->isFloatingPointTy() && "Invalid FPToUI instruction");
984
if (SrcTy->getTypeID() == Type::FloatTyID)
985
Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth);
987
Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth);
991
GenericValue Interpreter::executeFPToSIInst(Value *SrcVal, const Type *DstTy,
992
ExecutionContext &SF) {
993
const Type *SrcTy = SrcVal->getType();
994
uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
995
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
996
assert(SrcTy->isFloatingPointTy() && "Invalid FPToSI instruction");
998
if (SrcTy->getTypeID() == Type::FloatTyID)
999
Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth);
1001
Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth);
1005
GenericValue Interpreter::executeUIToFPInst(Value *SrcVal, const Type *DstTy,
1006
ExecutionContext &SF) {
1007
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1008
assert(DstTy->isFloatingPointTy() && "Invalid UIToFP instruction");
1010
if (DstTy->getTypeID() == Type::FloatTyID)
1011
Dest.FloatVal = APIntOps::RoundAPIntToFloat(Src.IntVal);
1013
Dest.DoubleVal = APIntOps::RoundAPIntToDouble(Src.IntVal);
1017
GenericValue Interpreter::executeSIToFPInst(Value *SrcVal, const Type *DstTy,
1018
ExecutionContext &SF) {
1019
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1020
assert(DstTy->isFloatingPointTy() && "Invalid SIToFP instruction");
1022
if (DstTy->getTypeID() == Type::FloatTyID)
1023
Dest.FloatVal = APIntOps::RoundSignedAPIntToFloat(Src.IntVal);
1025
Dest.DoubleVal = APIntOps::RoundSignedAPIntToDouble(Src.IntVal);
1030
GenericValue Interpreter::executePtrToIntInst(Value *SrcVal, const Type *DstTy,
1031
ExecutionContext &SF) {
1032
uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
1033
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1034
assert(SrcVal->getType()->isPointerTy() && "Invalid PtrToInt instruction");
1036
Dest.IntVal = APInt(DBitWidth, (intptr_t) Src.PointerVal);
1040
GenericValue Interpreter::executeIntToPtrInst(Value *SrcVal, const Type *DstTy,
1041
ExecutionContext &SF) {
1042
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1043
assert(DstTy->isPointerTy() && "Invalid PtrToInt instruction");
1045
uint32_t PtrSize = TD.getPointerSizeInBits();
1046
if (PtrSize != Src.IntVal.getBitWidth())
1047
Src.IntVal = Src.IntVal.zextOrTrunc(PtrSize);
1049
Dest.PointerVal = PointerTy(intptr_t(Src.IntVal.getZExtValue()));
1053
GenericValue Interpreter::executeBitCastInst(Value *SrcVal, const Type *DstTy,
1054
ExecutionContext &SF) {
1056
const Type *SrcTy = SrcVal->getType();
1057
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1058
if (DstTy->isPointerTy()) {
1059
assert(SrcTy->isPointerTy() && "Invalid BitCast");
1060
Dest.PointerVal = Src.PointerVal;
1061
} else if (DstTy->isIntegerTy()) {
1062
if (SrcTy->isFloatTy()) {
1063
Dest.IntVal.zext(sizeof(Src.FloatVal) * CHAR_BIT);
1064
Dest.IntVal.floatToBits(Src.FloatVal);
1065
} else if (SrcTy->isDoubleTy()) {
1066
Dest.IntVal.zext(sizeof(Src.DoubleVal) * CHAR_BIT);
1067
Dest.IntVal.doubleToBits(Src.DoubleVal);
1068
} else if (SrcTy->isIntegerTy()) {
1069
Dest.IntVal = Src.IntVal;
1071
llvm_unreachable("Invalid BitCast");
1072
} else if (DstTy->isFloatTy()) {
1073
if (SrcTy->isIntegerTy())
1074
Dest.FloatVal = Src.IntVal.bitsToFloat();
1076
Dest.FloatVal = Src.FloatVal;
1077
} else if (DstTy->isDoubleTy()) {
1078
if (SrcTy->isIntegerTy())
1079
Dest.DoubleVal = Src.IntVal.bitsToDouble();
1081
Dest.DoubleVal = Src.DoubleVal;
1083
llvm_unreachable("Invalid Bitcast");
1088
void Interpreter::visitTruncInst(TruncInst &I) {
1089
ExecutionContext &SF = ECStack.back();
1090
SetValue(&I, executeTruncInst(I.getOperand(0), I.getType(), SF), SF);
1093
void Interpreter::visitSExtInst(SExtInst &I) {
1094
ExecutionContext &SF = ECStack.back();
1095
SetValue(&I, executeSExtInst(I.getOperand(0), I.getType(), SF), SF);
1098
void Interpreter::visitZExtInst(ZExtInst &I) {
1099
ExecutionContext &SF = ECStack.back();
1100
SetValue(&I, executeZExtInst(I.getOperand(0), I.getType(), SF), SF);
1103
void Interpreter::visitFPTruncInst(FPTruncInst &I) {
1104
ExecutionContext &SF = ECStack.back();
1105
SetValue(&I, executeFPTruncInst(I.getOperand(0), I.getType(), SF), SF);
1108
void Interpreter::visitFPExtInst(FPExtInst &I) {
1109
ExecutionContext &SF = ECStack.back();
1110
SetValue(&I, executeFPExtInst(I.getOperand(0), I.getType(), SF), SF);
1113
void Interpreter::visitUIToFPInst(UIToFPInst &I) {
1114
ExecutionContext &SF = ECStack.back();
1115
SetValue(&I, executeUIToFPInst(I.getOperand(0), I.getType(), SF), SF);
1118
void Interpreter::visitSIToFPInst(SIToFPInst &I) {
1119
ExecutionContext &SF = ECStack.back();
1120
SetValue(&I, executeSIToFPInst(I.getOperand(0), I.getType(), SF), SF);
1123
void Interpreter::visitFPToUIInst(FPToUIInst &I) {
1124
ExecutionContext &SF = ECStack.back();
1125
SetValue(&I, executeFPToUIInst(I.getOperand(0), I.getType(), SF), SF);
1128
void Interpreter::visitFPToSIInst(FPToSIInst &I) {
1129
ExecutionContext &SF = ECStack.back();
1130
SetValue(&I, executeFPToSIInst(I.getOperand(0), I.getType(), SF), SF);
1133
void Interpreter::visitPtrToIntInst(PtrToIntInst &I) {
1134
ExecutionContext &SF = ECStack.back();
1135
SetValue(&I, executePtrToIntInst(I.getOperand(0), I.getType(), SF), SF);
1138
void Interpreter::visitIntToPtrInst(IntToPtrInst &I) {
1139
ExecutionContext &SF = ECStack.back();
1140
SetValue(&I, executeIntToPtrInst(I.getOperand(0), I.getType(), SF), SF);
1143
void Interpreter::visitBitCastInst(BitCastInst &I) {
1144
ExecutionContext &SF = ECStack.back();
1145
SetValue(&I, executeBitCastInst(I.getOperand(0), I.getType(), SF), SF);
1148
#define IMPLEMENT_VAARG(TY) \
1149
case Type::TY##TyID: Dest.TY##Val = Src.TY##Val; break
1151
void Interpreter::visitVAArgInst(VAArgInst &I) {
1152
ExecutionContext &SF = ECStack.back();
1154
// Get the incoming valist parameter. LLI treats the valist as a
1155
// (ec-stack-depth var-arg-index) pair.
1156
GenericValue VAList = getOperandValue(I.getOperand(0), SF);
1158
GenericValue Src = ECStack[VAList.UIntPairVal.first]
1159
.VarArgs[VAList.UIntPairVal.second];
1160
const Type *Ty = I.getType();
1161
switch (Ty->getTypeID()) {
1162
case Type::IntegerTyID: Dest.IntVal = Src.IntVal;
1163
IMPLEMENT_VAARG(Pointer);
1164
IMPLEMENT_VAARG(Float);
1165
IMPLEMENT_VAARG(Double);
1167
dbgs() << "Unhandled dest type for vaarg instruction: " << *Ty << "\n";
1168
llvm_unreachable(0);
1171
// Set the Value of this Instruction.
1172
SetValue(&I, Dest, SF);
1174
// Move the pointer to the next vararg.
1175
++VAList.UIntPairVal.second;
1178
GenericValue Interpreter::getConstantExprValue (ConstantExpr *CE,
1179
ExecutionContext &SF) {
1180
switch (CE->getOpcode()) {
1181
case Instruction::Trunc:
1182
return executeTruncInst(CE->getOperand(0), CE->getType(), SF);
1183
case Instruction::ZExt:
1184
return executeZExtInst(CE->getOperand(0), CE->getType(), SF);
1185
case Instruction::SExt:
1186
return executeSExtInst(CE->getOperand(0), CE->getType(), SF);
1187
case Instruction::FPTrunc:
1188
return executeFPTruncInst(CE->getOperand(0), CE->getType(), SF);
1189
case Instruction::FPExt:
1190
return executeFPExtInst(CE->getOperand(0), CE->getType(), SF);
1191
case Instruction::UIToFP:
1192
return executeUIToFPInst(CE->getOperand(0), CE->getType(), SF);
1193
case Instruction::SIToFP:
1194
return executeSIToFPInst(CE->getOperand(0), CE->getType(), SF);
1195
case Instruction::FPToUI:
1196
return executeFPToUIInst(CE->getOperand(0), CE->getType(), SF);
1197
case Instruction::FPToSI:
1198
return executeFPToSIInst(CE->getOperand(0), CE->getType(), SF);
1199
case Instruction::PtrToInt:
1200
return executePtrToIntInst(CE->getOperand(0), CE->getType(), SF);
1201
case Instruction::IntToPtr:
1202
return executeIntToPtrInst(CE->getOperand(0), CE->getType(), SF);
1203
case Instruction::BitCast:
1204
return executeBitCastInst(CE->getOperand(0), CE->getType(), SF);
1205
case Instruction::GetElementPtr:
1206
return executeGEPOperation(CE->getOperand(0), gep_type_begin(CE),
1207
gep_type_end(CE), SF);
1208
case Instruction::FCmp:
1209
case Instruction::ICmp:
1210
return executeCmpInst(CE->getPredicate(),
1211
getOperandValue(CE->getOperand(0), SF),
1212
getOperandValue(CE->getOperand(1), SF),
1213
CE->getOperand(0)->getType());
1214
case Instruction::Select:
1215
return executeSelectInst(getOperandValue(CE->getOperand(0), SF),
1216
getOperandValue(CE->getOperand(1), SF),
1217
getOperandValue(CE->getOperand(2), SF));
1222
// The cases below here require a GenericValue parameter for the result
1223
// so we initialize one, compute it and then return it.
1224
GenericValue Op0 = getOperandValue(CE->getOperand(0), SF);
1225
GenericValue Op1 = getOperandValue(CE->getOperand(1), SF);
1227
const Type * Ty = CE->getOperand(0)->getType();
1228
switch (CE->getOpcode()) {
1229
case Instruction::Add: Dest.IntVal = Op0.IntVal + Op1.IntVal; break;
1230
case Instruction::Sub: Dest.IntVal = Op0.IntVal - Op1.IntVal; break;
1231
case Instruction::Mul: Dest.IntVal = Op0.IntVal * Op1.IntVal; break;
1232
case Instruction::FAdd: executeFAddInst(Dest, Op0, Op1, Ty); break;
1233
case Instruction::FSub: executeFSubInst(Dest, Op0, Op1, Ty); break;
1234
case Instruction::FMul: executeFMulInst(Dest, Op0, Op1, Ty); break;
1235
case Instruction::FDiv: executeFDivInst(Dest, Op0, Op1, Ty); break;
1236
case Instruction::FRem: executeFRemInst(Dest, Op0, Op1, Ty); break;
1237
case Instruction::SDiv: Dest.IntVal = Op0.IntVal.sdiv(Op1.IntVal); break;
1238
case Instruction::UDiv: Dest.IntVal = Op0.IntVal.udiv(Op1.IntVal); break;
1239
case Instruction::URem: Dest.IntVal = Op0.IntVal.urem(Op1.IntVal); break;
1240
case Instruction::SRem: Dest.IntVal = Op0.IntVal.srem(Op1.IntVal); break;
1241
case Instruction::And: Dest.IntVal = Op0.IntVal & Op1.IntVal; break;
1242
case Instruction::Or: Dest.IntVal = Op0.IntVal | Op1.IntVal; break;
1243
case Instruction::Xor: Dest.IntVal = Op0.IntVal ^ Op1.IntVal; break;
1244
case Instruction::Shl:
1245
Dest.IntVal = Op0.IntVal.shl(Op1.IntVal.getZExtValue());
1247
case Instruction::LShr:
1248
Dest.IntVal = Op0.IntVal.lshr(Op1.IntVal.getZExtValue());
1250
case Instruction::AShr:
1251
Dest.IntVal = Op0.IntVal.ashr(Op1.IntVal.getZExtValue());
1254
dbgs() << "Unhandled ConstantExpr: " << *CE << "\n";
1255
llvm_unreachable(0);
1256
return GenericValue();
1261
GenericValue Interpreter::getOperandValue(Value *V, ExecutionContext &SF) {
1262
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
1263
return getConstantExprValue(CE, SF);
1264
} else if (Constant *CPV = dyn_cast<Constant>(V)) {
1265
return getConstantValue(CPV);
1266
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
1267
return PTOGV(getPointerToGlobal(GV));
1269
return SF.Values[V];
1273
//===----------------------------------------------------------------------===//
1274
// Dispatch and Execution Code
1275
//===----------------------------------------------------------------------===//
1277
//===----------------------------------------------------------------------===//
1278
// callFunction - Execute the specified function...
1280
void Interpreter::callFunction(Function *F,
1281
const std::vector<GenericValue> &ArgVals) {
1282
assert((ECStack.empty() || ECStack.back().Caller.getInstruction() == 0 ||
1283
ECStack.back().Caller.arg_size() == ArgVals.size()) &&
1284
"Incorrect number of arguments passed into function call!");
1285
// Make a new stack frame... and fill it in.
1286
ECStack.push_back(ExecutionContext());
1287
ExecutionContext &StackFrame = ECStack.back();
1288
StackFrame.CurFunction = F;
1290
// Special handling for external functions.
1291
if (F->isDeclaration()) {
1292
GenericValue Result = callExternalFunction (F, ArgVals);
1293
// Simulate a 'ret' instruction of the appropriate type.
1294
popStackAndReturnValueToCaller (F->getReturnType (), Result);
1298
// Get pointers to first LLVM BB & Instruction in function.
1299
StackFrame.CurBB = F->begin();
1300
StackFrame.CurInst = StackFrame.CurBB->begin();
1302
// Run through the function arguments and initialize their values...
1303
assert((ArgVals.size() == F->arg_size() ||
1304
(ArgVals.size() > F->arg_size() && F->getFunctionType()->isVarArg()))&&
1305
"Invalid number of values passed to function invocation!");
1307
// Handle non-varargs arguments...
1309
for (Function::arg_iterator AI = F->arg_begin(), E = F->arg_end();
1311
SetValue(AI, ArgVals[i], StackFrame);
1313
// Handle varargs arguments...
1314
StackFrame.VarArgs.assign(ArgVals.begin()+i, ArgVals.end());
1318
void Interpreter::run() {
1319
while (!ECStack.empty()) {
1320
// Interpret a single instruction & increment the "PC".
1321
ExecutionContext &SF = ECStack.back(); // Current stack frame
1322
Instruction &I = *SF.CurInst++; // Increment before execute
1324
// Track the number of dynamic instructions executed.
1327
DEBUG(dbgs() << "About to interpret: " << I);
1328
visit(I); // Dispatch to one of the visit* methods...
1330
// This is not safe, as visiting the instruction could lower it and free I.
1332
if (!isa<CallInst>(I) && !isa<InvokeInst>(I) &&
1333
I.getType() != Type::VoidTy) {
1335
const GenericValue &Val = SF.Values[&I];
1336
switch (I.getType()->getTypeID()) {
1337
default: llvm_unreachable("Invalid GenericValue Type");
1338
case Type::VoidTyID: dbgs() << "void"; break;
1339
case Type::FloatTyID: dbgs() << "float " << Val.FloatVal; break;
1340
case Type::DoubleTyID: dbgs() << "double " << Val.DoubleVal; break;
1341
case Type::PointerTyID: dbgs() << "void* " << intptr_t(Val.PointerVal);
1343
case Type::IntegerTyID:
1344
dbgs() << "i" << Val.IntVal.getBitWidth() << " "
1345
<< Val.IntVal.toStringUnsigned(10)
1346
<< " (0x" << Val.IntVal.toStringUnsigned(16) << ")\n";