It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/Interpreter/Execution.cpp b/lib/ExecutionEngine/Interpreter/Execution.cpp
new file mode 100644
index 0000000..281f774
--- /dev/null
+++ b/lib/ExecutionEngine/Interpreter/Execution.cpp
@@ -0,0 +1,1374 @@
+//===-- Execution.cpp - Implement code to simulate the program ------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the actual instruction interpreter.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "interpreter"
+#include "Interpreter.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Instructions.h"
+#include "llvm/ParameterAttributes.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
+#include "llvm/Support/GetElementPtrTypeIterator.h"
+#include "llvm/ADT/APInt.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/MathExtras.h"
+#include <cmath>
+using namespace llvm;
+
+STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed");
+static Interpreter *TheEE = 0;
+
+//===----------------------------------------------------------------------===//
+// Various Helper Functions
+//===----------------------------------------------------------------------===//
+
+static inline uint64_t doSignExtension(uint64_t Val, const IntegerType* ITy) {
+ // Determine if the value is signed or not
+ bool isSigned = (Val & (1 << (ITy->getBitWidth()-1))) != 0;
+ // If its signed, extend the sign bits
+ if (isSigned)
+ Val |= ~ITy->getBitMask();
+ return Val;
+}
+
+static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) {
+ SF.Values[V] = Val;
+}
+
+void Interpreter::initializeExecutionEngine() {
+ TheEE = this;
+}
+
+//===----------------------------------------------------------------------===//
+// Binary Instruction Implementations
+//===----------------------------------------------------------------------===//
+
+#define IMPLEMENT_BINARY_OPERATOR(OP, TY) \
+ case Type::TY##TyID: \
+ Dest.TY##Val = Src1.TY##Val OP Src2.TY##Val; \
+ break
+
+#define IMPLEMENT_INTEGER_BINOP1(OP, TY) \
+ case Type::IntegerTyID: { \
+ Dest.IntVal = Src1.IntVal OP Src2.IntVal; \
+ break; \
+ }
+
+
+static void executeAddInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_BINOP1(+, Ty);
+ IMPLEMENT_BINARY_OPERATOR(+, Float);
+ IMPLEMENT_BINARY_OPERATOR(+, Double);
+ default:
+ cerr << "Unhandled type for Add instruction: " << *Ty << "\n";
+ abort();
+ }
+}
+
+static void executeSubInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_BINOP1(-, Ty);
+ IMPLEMENT_BINARY_OPERATOR(-, Float);
+ IMPLEMENT_BINARY_OPERATOR(-, Double);
+ default:
+ cerr << "Unhandled type for Sub instruction: " << *Ty << "\n";
+ abort();
+ }
+}
+
+static void executeMulInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_BINOP1(*, Ty);
+ IMPLEMENT_BINARY_OPERATOR(*, Float);
+ IMPLEMENT_BINARY_OPERATOR(*, Double);
+ default:
+ cerr << "Unhandled type for Mul instruction: " << *Ty << "\n";
+ abort();
+ }
+}
+
+static void executeFDivInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_BINARY_OPERATOR(/, Float);
+ IMPLEMENT_BINARY_OPERATOR(/, Double);
+ default:
+ cerr << "Unhandled type for FDiv instruction: " << *Ty << "\n";
+ abort();
+ }
+}
+
+static void executeFRemInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, const 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:
+ cerr << "Unhandled type for Rem instruction: " << *Ty << "\n";
+ abort();
+ }
+}
+
+#define IMPLEMENT_INTEGER_ICMP(OP, TY) \
+ case Type::IntegerTyID: \
+ Dest.IntVal = APInt(1,Src1.IntVal.OP(Src2.IntVal)); \
+ break;
+
+// Handle pointers specially because they must be compared with only as much
+// width as the host has. We _do not_ want to be comparing 64 bit values when
+// running on a 32-bit target, otherwise the upper 32 bits might mess up
+// comparisons if they contain garbage.
+#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,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(eq,Ty);
+ IMPLEMENT_POINTER_ICMP(==);
+ default:
+ cerr << "Unhandled type for ICMP_EQ predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeICMP_NE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(ne,Ty);
+ IMPLEMENT_POINTER_ICMP(!=);
+ default:
+ cerr << "Unhandled type for ICMP_NE predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeICMP_ULT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(ult,Ty);
+ IMPLEMENT_POINTER_ICMP(<);
+ default:
+ cerr << "Unhandled type for ICMP_ULT predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeICMP_SLT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(slt,Ty);
+ IMPLEMENT_POINTER_ICMP(<);
+ default:
+ cerr << "Unhandled type for ICMP_SLT predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeICMP_UGT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(ugt,Ty);
+ IMPLEMENT_POINTER_ICMP(>);
+ default:
+ cerr << "Unhandled type for ICMP_UGT predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeICMP_SGT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(sgt,Ty);
+ IMPLEMENT_POINTER_ICMP(>);
+ default:
+ cerr << "Unhandled type for ICMP_SGT predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeICMP_ULE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(ule,Ty);
+ IMPLEMENT_POINTER_ICMP(<=);
+ default:
+ cerr << "Unhandled type for ICMP_ULE predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeICMP_SLE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(sle,Ty);
+ IMPLEMENT_POINTER_ICMP(<=);
+ default:
+ cerr << "Unhandled type for ICMP_SLE predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeICMP_UGE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(uge,Ty);
+ IMPLEMENT_POINTER_ICMP(>=);
+ default:
+ cerr << "Unhandled type for ICMP_UGE predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeICMP_SGE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_INTEGER_ICMP(sge,Ty);
+ IMPLEMENT_POINTER_ICMP(>=);
+ default:
+ cerr << "Unhandled type for ICMP_SGE predicate: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+void Interpreter::visitICmpInst(ICmpInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ const Type *Ty = I.getOperand(0)->getType();
+ GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
+ GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+ GenericValue R; // Result
+
+ 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:
+ cerr << "Don't know how to handle this ICmp predicate!\n-->" << I;
+ abort();
+ }
+
+ 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,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(==, Float);
+ IMPLEMENT_FCMP(==, Double);
+ default:
+ cerr << "Unhandled type for FCmp EQ instruction: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_ONE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(!=, Float);
+ IMPLEMENT_FCMP(!=, Double);
+
+ default:
+ cerr << "Unhandled type for FCmp NE instruction: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_OLE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(<=, Float);
+ IMPLEMENT_FCMP(<=, Double);
+ default:
+ cerr << "Unhandled type for FCmp LE instruction: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_OGE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(>=, Float);
+ IMPLEMENT_FCMP(>=, Double);
+ default:
+ cerr << "Unhandled type for FCmp GE instruction: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_OLT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(<, Float);
+ IMPLEMENT_FCMP(<, Double);
+ default:
+ cerr << "Unhandled type for FCmp LT instruction: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_OGT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(>, Float);
+ IMPLEMENT_FCMP(>, Double);
+ default:
+ cerr << "Unhandled type for FCmp GT instruction: " << *Ty << "\n";
+ abort();
+ }
+ return Dest;
+}
+
+#define IMPLEMENT_UNORDERED(TY, X,Y) \
+ if (TY == Type::FloatTy) \
+ 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,
+ const Type *Ty) {
+ GenericValue Dest;
+ IMPLEMENT_UNORDERED(Ty, Src1, Src2)
+ return executeFCMP_OEQ(Src1, Src2, Ty);
+}
+
+static GenericValue executeFCMP_UNE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ IMPLEMENT_UNORDERED(Ty, Src1, Src2)
+ return executeFCMP_ONE(Src1, Src2, Ty);
+}
+
+static GenericValue executeFCMP_ULE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ IMPLEMENT_UNORDERED(Ty, Src1, Src2)
+ return executeFCMP_OLE(Src1, Src2, Ty);
+}
+
+static GenericValue executeFCMP_UGE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ IMPLEMENT_UNORDERED(Ty, Src1, Src2)
+ return executeFCMP_OGE(Src1, Src2, Ty);
+}
+
+static GenericValue executeFCMP_ULT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ IMPLEMENT_UNORDERED(Ty, Src1, Src2)
+ return executeFCMP_OLT(Src1, Src2, Ty);
+}
+
+static GenericValue executeFCMP_UGT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ IMPLEMENT_UNORDERED(Ty, Src1, Src2)
+ return executeFCMP_OGT(Src1, Src2, Ty);
+}
+
+static GenericValue executeFCMP_ORD(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ if (Ty == Type::FloatTy)
+ 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,
+ const Type *Ty) {
+ GenericValue Dest;
+ if (Ty == Type::FloatTy)
+ 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();
+ const Type *Ty = I.getOperand(0)->getType();
+ GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
+ GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+ GenericValue R; // Result
+
+ 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:
+ cerr << "Don't know how to handle this FCmp predicate!\n-->" << I;
+ abort();
+ }
+
+ SetValue(&I, R, SF);
+}
+
+static GenericValue executeCmpInst(unsigned predicate, GenericValue Src1,
+ GenericValue Src2, const 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:
+ cerr << "Unhandled Cmp predicate\n";
+ abort();
+ }
+}
+
+void Interpreter::visitBinaryOperator(BinaryOperator &I) {
+ ExecutionContext &SF = ECStack.back();
+ const Type *Ty = I.getOperand(0)->getType();
+ GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
+ GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+ GenericValue R; // Result
+
+ switch (I.getOpcode()) {
+ case Instruction::Add: executeAddInst (R, Src1, Src2, Ty); break;
+ case Instruction::Sub: executeSubInst (R, Src1, Src2, Ty); break;
+ case Instruction::Mul: executeMulInst (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:
+ cerr << "Don't know how to handle this binary operator!\n-->" << I;
+ abort();
+ }
+
+ 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);
+}
+
+
+//===----------------------------------------------------------------------===//
+// Terminator Instruction Implementations
+//===----------------------------------------------------------------------===//
+
+void Interpreter::exitCalled(GenericValue GV) {
+ // runAtExitHandlers() assumes there are no stack frames, but
+ // if exit() was called, then it had a stack frame. Blow away
+ // the stack before interpreting atexit handlers.
+ ECStack.clear ();
+ runAtExitHandlers ();
+ exit (GV.IntVal.zextOrTrunc(32).getZExtValue());
+}
+
+/// Pop the last stack frame off of ECStack and then copy the result
+/// back into the result variable if we are not returning void. The
+/// result variable may be the ExitValue, or the Value of the calling
+/// CallInst if there was a previous stack frame. This method may
+/// invalidate any ECStack iterators you have. This method also takes
+/// care of switching to the normal destination BB, if we are returning
+/// from an invoke.
+///
+void Interpreter::popStackAndReturnValueToCaller (const Type *RetTy,
+ GenericValue Result) {
+ // Pop the current stack frame.
+ ECStack.pop_back();
+
+ if (ECStack.empty()) { // Finished main. Put result into exit code...
+ if (RetTy && RetTy->isInteger()) { // Nonvoid return type?
+ ExitValue = Result; // Capture the exit value of the program
+ } else {
+ memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
+ }
+ } else {
+ // If we have a previous stack frame, and we have a previous call,
+ // fill in the return value...
+ ExecutionContext &CallingSF = ECStack.back();
+ if (Instruction *I = CallingSF.Caller.getInstruction()) {
+ if (CallingSF.Caller.getType() != Type::VoidTy) // Save result...
+ SetValue(I, Result, CallingSF);
+ if (InvokeInst *II = dyn_cast<InvokeInst> (I))
+ SwitchToNewBasicBlock (II->getNormalDest (), CallingSF);
+ CallingSF.Caller = CallSite(); // We returned from the call...
+ }
+ }
+}
+
+void Interpreter::visitReturnInst(ReturnInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ const Type *RetTy = Type::VoidTy;
+ GenericValue Result;
+
+ // Save away the return value... (if we are not 'ret void')
+ if (I.getNumOperands()) {
+ RetTy = I.getReturnValue()->getType();
+ Result = getOperandValue(I.getReturnValue(), SF);
+ }
+
+ popStackAndReturnValueToCaller(RetTy, Result);
+}
+
+void Interpreter::visitUnwindInst(UnwindInst &I) {
+ // Unwind stack
+ Instruction *Inst;
+ do {
+ ECStack.pop_back ();
+ if (ECStack.empty ())
+ abort ();
+ Inst = ECStack.back ().Caller.getInstruction ();
+ } while (!(Inst && isa<InvokeInst> (Inst)));
+
+ // Return from invoke
+ ExecutionContext &InvokingSF = ECStack.back ();
+ InvokingSF.Caller = CallSite ();
+
+ // Go to exceptional destination BB of invoke instruction
+ SwitchToNewBasicBlock(cast<InvokeInst>(Inst)->getUnwindDest(), InvokingSF);
+}
+
+void Interpreter::visitUnreachableInst(UnreachableInst &I) {
+ cerr << "ERROR: Program executed an 'unreachable' instruction!\n";
+ abort();
+}
+
+void Interpreter::visitBranchInst(BranchInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ BasicBlock *Dest;
+
+ Dest = I.getSuccessor(0); // Uncond branches have a fixed dest...
+ if (!I.isUnconditional()) {
+ Value *Cond = I.getCondition();
+ if (getOperandValue(Cond, SF).IntVal == 0) // If false cond...
+ Dest = I.getSuccessor(1);
+ }
+ SwitchToNewBasicBlock(Dest, SF);
+}
+
+void Interpreter::visitSwitchInst(SwitchInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ GenericValue CondVal = getOperandValue(I.getOperand(0), SF);
+ const Type *ElTy = I.getOperand(0)->getType();
+
+ // Check to see if any of the cases match...
+ BasicBlock *Dest = 0;
+ for (unsigned i = 2, e = I.getNumOperands(); i != e; i += 2)
+ if (executeICMP_EQ(CondVal, getOperandValue(I.getOperand(i), SF), ElTy)
+ .IntVal != 0) {
+ Dest = cast<BasicBlock>(I.getOperand(i+1));
+ break;
+ }
+
+ if (!Dest) Dest = I.getDefaultDest(); // No cases matched: use default
+ SwitchToNewBasicBlock(Dest, SF);
+}
+
+// SwitchToNewBasicBlock - This method is used to jump to a new basic block.
+// This function handles the actual updating of block and instruction iterators
+// as well as execution of all of the PHI nodes in the destination block.
+//
+// This method does this because all of the PHI nodes must be executed
+// atomically, reading their inputs before any of the results are updated. Not
+// doing this can cause problems if the PHI nodes depend on other PHI nodes for
+// their inputs. If the input PHI node is updated before it is read, incorrect
+// results can happen. Thus we use a two phase approach.
+//
+void Interpreter::SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF){
+ BasicBlock *PrevBB = SF.CurBB; // Remember where we came from...
+ SF.CurBB = Dest; // Update CurBB to branch destination
+ SF.CurInst = SF.CurBB->begin(); // Update new instruction ptr...
+
+ if (!isa<PHINode>(SF.CurInst)) return; // Nothing fancy to do
+
+ // Loop over all of the PHI nodes in the current block, reading their inputs.
+ std::vector<GenericValue> ResultValues;
+
+ for (; PHINode *PN = dyn_cast<PHINode>(SF.CurInst); ++SF.CurInst) {
+ // Search for the value corresponding to this previous bb...
+ int i = PN->getBasicBlockIndex(PrevBB);
+ assert(i != -1 && "PHINode doesn't contain entry for predecessor??");
+ Value *IncomingValue = PN->getIncomingValue(i);
+
+ // Save the incoming value for this PHI node...
+ ResultValues.push_back(getOperandValue(IncomingValue, SF));
+ }
+
+ // Now loop over all of the PHI nodes setting their values...
+ 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);
+ }
+}
+
+//===----------------------------------------------------------------------===//
+// Memory Instruction Implementations
+//===----------------------------------------------------------------------===//
+
+void Interpreter::visitAllocationInst(AllocationInst &I) {
+ ExecutionContext &SF = ECStack.back();
+
+ const Type *Ty = I.getType()->getElementType(); // Type to be allocated
+
+ // Get the number of elements being allocated by the array...
+ unsigned NumElements =
+ getOperandValue(I.getOperand(0), SF).IntVal.getZExtValue();
+
+ unsigned TypeSize = (size_t)TD.getTypeSize(Ty);
+
+ unsigned MemToAlloc = NumElements * TypeSize;
+
+ // Allocate enough memory to hold the type...
+ void *Memory = malloc(MemToAlloc);
+
+ DOUT << "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);
+}
+
+void Interpreter::visitFreeInst(FreeInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ assert(isa<PointerType>(I.getOperand(0)->getType()) && "Freeing nonptr?");
+ GenericValue Value = getOperandValue(I.getOperand(0), SF);
+ // TODO: Check to make sure memory is allocated
+ free(GVTOP(Value)); // Free memory
+}
+
+// getElementOffset - The workhorse for getelementptr.
+//
+GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I,
+ gep_type_iterator E,
+ ExecutionContext &SF) {
+ assert(isa<PointerType>(Ptr->getType()) &&
+ "Cannot getElementOffset of a nonpointer type!");
+
+ uint64_t Total = 0;
+
+ for (; I != E; ++I) {
+ if (const 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 {
+ const SequentialType *ST = cast<SequentialType>(*I);
+ // Get the index number for the array... which must be long type...
+ 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 if (BitWidth == 64)
+ Idx = (int64_t)IdxGV.IntVal.getZExtValue();
+ else
+ assert(0 && "Invalid index type for getelementptr");
+ Total += TD.getTypeSize(ST->getElementType())*Idx;
+ }
+ }
+
+ GenericValue Result;
+ Result.PointerVal = ((char*)getOperandValue(Ptr, SF).PointerVal) + Total;
+ DOUT << "GEP Index " << Total << " bytes.\n";
+ return Result;
+}
+
+void Interpreter::visitGetElementPtrInst(GetElementPtrInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, TheEE->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);
+}
+
+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());
+}
+
+//===----------------------------------------------------------------------===//
+// Miscellaneous Instruction Implementations
+//===----------------------------------------------------------------------===//
+
+void Interpreter::visitCallSite(CallSite CS) {
+ ExecutionContext &SF = ECStack.back();
+
+ // Check to see if this is an intrinsic function call...
+ Function *F = CS.getCalledFunction();
+ if (F && F->isDeclaration ())
+ switch (F->getIntrinsicID()) {
+ case Intrinsic::not_intrinsic:
+ break;
+ case Intrinsic::vastart: { // va_start
+ GenericValue ArgIndex;
+ ArgIndex.UIntPairVal.first = ECStack.size() - 1;
+ ArgIndex.UIntPairVal.second = 0;
+ SetValue(CS.getInstruction(), ArgIndex, SF);
+ return;
+ }
+ case Intrinsic::vaend: // va_end is a noop for the interpreter
+ return;
+ case Intrinsic::vacopy: // va_copy: dest = src
+ SetValue(CS.getInstruction(), getOperandValue(*CS.arg_begin(), SF), SF);
+ return;
+ default:
+ // If it is an unknown intrinsic function, use the intrinsic lowering
+ // class to transform it into hopefully tasty LLVM code.
+ //
+ BasicBlock::iterator me(CS.getInstruction());
+ BasicBlock *Parent = CS.getInstruction()->getParent();
+ bool atBegin(Parent->begin() == me);
+ if (!atBegin)
+ --me;
+ IL->LowerIntrinsicCall(cast<CallInst>(CS.getInstruction()));
+
+ // Restore the CurInst pointer to the first instruction newly inserted, if
+ // any.
+ 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));
+ if (F) {
+ // Promote all integral types whose size is < sizeof(i32) into i32.
+ // We do this by zero or sign extending the value as appropriate
+ // according to the parameter attributes
+ const Type *Ty = V->getType();
+ if (Ty->isInteger() && (ArgVals.back().IntVal.getBitWidth() < 32))
+ if (const ParamAttrsList *PA = F->getParamAttrs())
+ if (PA->paramHasAttr(pNum, ParamAttr::ZExt))
+ ArgVals.back().IntVal = ArgVals.back().IntVal.zext(32);
+ else if (PA->paramHasAttr(pNum, ParamAttr::SExt))
+ ArgVals.back().IntVal = ArgVals.back().IntVal.sext(32);
+ }
+ }
+
+ // To handle indirect calls, we must get the pointer value from the argument
+ // and treat it as a function pointer.
+ 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;
+ Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue());
+ 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;
+ Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue());
+ 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;
+ Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue());
+ SetValue(&I, Dest, SF);
+}
+
+GenericValue Interpreter::executeTruncInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ const Type *SrcTy = SrcVal->getType();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ const IntegerType *DITy = cast<IntegerType>(DstTy);
+ const IntegerType *SITy = cast<IntegerType>(SrcTy);
+ unsigned DBitWidth = DITy->getBitWidth();
+ unsigned SBitWidth = SITy->getBitWidth();
+ assert(SBitWidth > DBitWidth && "Invalid truncate");
+ Dest.IntVal = Src.IntVal.trunc(DBitWidth);
+ return Dest;
+}
+
+GenericValue Interpreter::executeSExtInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ const Type *SrcTy = SrcVal->getType();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ const IntegerType *DITy = cast<IntegerType>(DstTy);
+ const IntegerType *SITy = cast<IntegerType>(SrcTy);
+ unsigned DBitWidth = DITy->getBitWidth();
+ unsigned SBitWidth = SITy->getBitWidth();
+ assert(SBitWidth < DBitWidth && "Invalid sign extend");
+ Dest.IntVal = Src.IntVal.sext(DBitWidth);
+ return Dest;
+}
+
+GenericValue Interpreter::executeZExtInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ const Type *SrcTy = SrcVal->getType();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ const IntegerType *DITy = cast<IntegerType>(DstTy);
+ const IntegerType *SITy = cast<IntegerType>(SrcTy);
+ unsigned DBitWidth = DITy->getBitWidth();
+ unsigned SBitWidth = SITy->getBitWidth();
+ assert(SBitWidth < DBitWidth && "Invalid sign extend");
+ Dest.IntVal = Src.IntVal.zext(DBitWidth);
+ return Dest;
+}
+
+GenericValue Interpreter::executeFPTruncInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ const Type *SrcTy = SrcVal->getType();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(SrcTy == Type::DoubleTy && DstTy == Type::FloatTy &&
+ "Invalid FPTrunc instruction");
+ Dest.FloatVal = (float) Src.DoubleVal;
+ return Dest;
+}
+
+GenericValue Interpreter::executeFPExtInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ const Type *SrcTy = SrcVal->getType();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(SrcTy == Type::FloatTy && DstTy == Type::DoubleTy &&
+ "Invalid FPTrunc instruction");
+ Dest.DoubleVal = (double) Src.FloatVal;
+ return Dest;
+}
+
+GenericValue Interpreter::executeFPToUIInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ const Type *SrcTy = SrcVal->getType();
+ uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(SrcTy->isFloatingPoint() && "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, const Type *DstTy,
+ ExecutionContext &SF) {
+ const Type *SrcTy = SrcVal->getType();
+ uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(SrcTy->isFloatingPoint() && "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, const Type *DstTy,
+ ExecutionContext &SF) {
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(DstTy->isFloatingPoint() && "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, const Type *DstTy,
+ ExecutionContext &SF) {
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(DstTy->isFloatingPoint() && "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, const Type *DstTy,
+ ExecutionContext &SF) {
+ const Type *SrcTy = SrcVal->getType();
+ uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(isa<PointerType>(SrcTy) && "Invalid PtrToInt instruction");
+
+ Dest.IntVal = APInt(DBitWidth, (intptr_t) Src.PointerVal);
+ return Dest;
+}
+
+GenericValue Interpreter::executeIntToPtrInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(isa<PointerType>(DstTy) && "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, const Type *DstTy,
+ ExecutionContext &SF) {
+
+ const Type *SrcTy = SrcVal->getType();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ if (isa<PointerType>(DstTy)) {
+ assert(isa<PointerType>(SrcTy) && "Invalid BitCast");
+ Dest.PointerVal = Src.PointerVal;
+ } else if (DstTy->isInteger()) {
+ if (SrcTy == Type::FloatTy) {
+ Dest.IntVal.zext(sizeof(Src.FloatVal) * 8);
+ Dest.IntVal.floatToBits(Src.FloatVal);
+ } else if (SrcTy == Type::DoubleTy) {
+ Dest.IntVal.zext(sizeof(Src.DoubleVal) * 8);
+ Dest.IntVal.doubleToBits(Src.DoubleVal);
+ } else if (SrcTy->isInteger()) {
+ Dest.IntVal = Src.IntVal;
+ } else
+ assert(0 && "Invalid BitCast");
+ } else if (DstTy == Type::FloatTy) {
+ if (SrcTy->isInteger())
+ Dest.FloatVal = Src.IntVal.bitsToFloat();
+ else
+ Dest.FloatVal = Src.FloatVal;
+ } else if (DstTy == Type::DoubleTy) {
+ if (SrcTy->isInteger())
+ Dest.DoubleVal = Src.IntVal.bitsToDouble();
+ else
+ Dest.DoubleVal = Src.DoubleVal;
+ } else
+ assert(0 && "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();
+
+ // Get the incoming valist parameter. LLI treats the valist as a
+ // (ec-stack-depth var-arg-index) pair.
+ GenericValue VAList = getOperandValue(I.getOperand(0), SF);
+ GenericValue Dest;
+ GenericValue Src = ECStack[VAList.UIntPairVal.first]
+ .VarArgs[VAList.UIntPairVal.second];
+ const Type *Ty = I.getType();
+ switch (Ty->getTypeID()) {
+ case Type::IntegerTyID: Dest.IntVal = Src.IntVal;
+ IMPLEMENT_VAARG(Pointer);
+ IMPLEMENT_VAARG(Float);
+ IMPLEMENT_VAARG(Double);
+ default:
+ cerr << "Unhandled dest type for vaarg instruction: " << *Ty << "\n";
+ abort();
+ }
+
+ // Set the Value of this Instruction.
+ SetValue(&I, Dest, SF);
+
+ // Move the pointer to the next vararg.
+ ++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;
+ }
+
+ // The cases below here require a GenericValue parameter for the result
+ // so we initialize one, compute it and then return it.
+ GenericValue Op0 = getOperandValue(CE->getOperand(0), SF);
+ GenericValue Op1 = getOperandValue(CE->getOperand(1), SF);
+ GenericValue Dest;
+ const Type * Ty = CE->getOperand(0)->getType();
+ switch (CE->getOpcode()) {
+ case Instruction::Add: executeAddInst (Dest, Op0, Op1, Ty); break;
+ case Instruction::Sub: executeSubInst (Dest, Op0, Op1, Ty); break;
+ case Instruction::Mul: executeMulInst (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.And(Op1.IntVal); break;
+ case Instruction::Or: Dest.IntVal = Op0.IntVal.Or(Op1.IntVal); break;
+ case Instruction::Xor: Dest.IntVal = Op0.IntVal.Xor(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:
+ cerr << "Unhandled ConstantExpr: " << *CE << "\n";
+ abort();
+ return GenericValue();
+ }
+ 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];
+ }
+}
+
+//===----------------------------------------------------------------------===//
+// Dispatch and Execution Code
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// callFunction - Execute the specified function...
+//
+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!");
+ // Make a new stack frame... and fill it in.
+ ECStack.push_back(ExecutionContext());
+ ExecutionContext &StackFrame = ECStack.back();
+ StackFrame.CurFunction = F;
+
+ // Special handling for external functions.
+ if (F->isDeclaration()) {
+ GenericValue Result = callExternalFunction (F, ArgVals);
+ // Simulate a 'ret' instruction of the appropriate type.
+ popStackAndReturnValueToCaller (F->getReturnType (), Result);
+ return;
+ }
+
+ // Get pointers to first LLVM BB & Instruction in function.
+ StackFrame.CurBB = F->begin();
+ StackFrame.CurInst = StackFrame.CurBB->begin();
+
+ // Run through the function arguments and initialize their values...
+ assert((ArgVals.size() == F->arg_size() ||
+ (ArgVals.size() > F->arg_size() && F->getFunctionType()->isVarArg()))&&
+ "Invalid number of values passed to function invocation!");
+
+ // Handle non-varargs arguments...
+ unsigned i = 0;
+ for (Function::arg_iterator AI = F->arg_begin(), E = F->arg_end();
+ AI != E; ++AI, ++i)
+ SetValue(AI, ArgVals[i], StackFrame);
+
+ // Handle varargs arguments...
+ StackFrame.VarArgs.assign(ArgVals.begin()+i, ArgVals.end());
+}
+
+static void PrintGenericValue(const GenericValue &Val, const Type* Ty) {
+ switch (Ty->getTypeID()) {
+ default: assert(0 && "Invalid GenericValue Type");
+ case Type::VoidTyID: DOUT << "void"; break;
+ case Type::FloatTyID: DOUT << "float " << Val.FloatVal; break;
+ case Type::DoubleTyID: DOUT << "double " << Val.DoubleVal; break;
+ case Type::PointerTyID: DOUT << "void* " << intptr_t(Val.PointerVal); break;
+ case Type::IntegerTyID:
+ DOUT << "i" << Val.IntVal.getBitWidth() << " " << Val.IntVal.toString(10)
+ << " (0x" << Val.IntVal.toString(16) << ")\n";
+ break;
+ }
+}
+
+void Interpreter::run() {
+ while (!ECStack.empty()) {
+ // Interpret a single instruction & increment the "PC".
+ ExecutionContext &SF = ECStack.back(); // Current stack frame
+ Instruction &I = *SF.CurInst++; // Increment before execute
+
+ // Track the number of dynamic instructions executed.
+ ++NumDynamicInsts;
+
+ DOUT << "About to interpret: " << I;
+ visit(I); // Dispatch to one of the visit* methods...
+#ifndef NDEBUG
+ if (!isa<CallInst>(I) && !isa<InvokeInst>(I) &&
+ I.getType() != Type::VoidTy) {
+ DOUT << " --> ";
+ PrintGenericValue(SF.Values[&I], I.getType());
+ }
+#endif
+ }
+}