Check in LLVM r95781.
diff --git a/lib/ExecutionEngine/Interpreter/CMakeLists.txt b/lib/ExecutionEngine/Interpreter/CMakeLists.txt
new file mode 100644
index 0000000..dff97fa
--- /dev/null
+++ b/lib/ExecutionEngine/Interpreter/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_llvm_library(LLVMInterpreter
+ Execution.cpp
+ ExternalFunctions.cpp
+ Interpreter.cpp
+ )
diff --git a/lib/ExecutionEngine/Interpreter/Execution.cpp b/lib/ExecutionEngine/Interpreter/Execution.cpp
new file mode 100644
index 0000000..73f5558
--- /dev/null
+++ b/lib/ExecutionEngine/Interpreter/Execution.cpp
@@ -0,0 +1,1352 @@
+//===-- Execution.cpp - Implement code to simulate the program ------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file 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/CodeGen/IntrinsicLowering.h"
+#include "llvm/Support/GetElementPtrTypeIterator.h"
+#include "llvm/ADT/APInt.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MathExtras.h"
+#include <algorithm>
+#include <cmath>
+using namespace llvm;
+
+STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed");
+
+static cl::opt<bool> PrintVolatile("interpreter-print-volatile", cl::Hidden,
+ cl::desc("make the interpreter print every volatile load and store"));
+
+//===----------------------------------------------------------------------===//
+// Various Helper Functions
+//===----------------------------------------------------------------------===//
+
+static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) {
+ SF.Values[V] = Val;
+}
+
+//===----------------------------------------------------------------------===//
+// Binary Instruction Implementations
+//===----------------------------------------------------------------------===//
+
+#define IMPLEMENT_BINARY_OPERATOR(OP, TY) \
+ case Type::TY##TyID: \
+ Dest.TY##Val = Src1.TY##Val OP Src2.TY##Val; \
+ break
+
+static void executeFAddInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_BINARY_OPERATOR(+, Float);
+ IMPLEMENT_BINARY_OPERATOR(+, Double);
+ default:
+ dbgs() << "Unhandled type for FAdd instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+}
+
+static void executeFSubInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_BINARY_OPERATOR(-, Float);
+ IMPLEMENT_BINARY_OPERATOR(-, Double);
+ default:
+ dbgs() << "Unhandled type for FSub instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+}
+
+static void executeFMulInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_BINARY_OPERATOR(*, Float);
+ IMPLEMENT_BINARY_OPERATOR(*, Double);
+ default:
+ dbgs() << "Unhandled type for FMul instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+}
+
+static void executeFDivInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_BINARY_OPERATOR(/, Float);
+ IMPLEMENT_BINARY_OPERATOR(/, Double);
+ default:
+ dbgs() << "Unhandled type for FDiv instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+}
+
+static void executeFRemInst(GenericValue &Dest, GenericValue Src1,
+ GenericValue Src2, 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:
+ dbgs() << "Unhandled type for Rem instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+}
+
+#define IMPLEMENT_INTEGER_ICMP(OP, TY) \
+ case Type::IntegerTyID: \
+ Dest.IntVal = APInt(1,Src1.IntVal.OP(Src2.IntVal)); \
+ break;
+
+// 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:
+ dbgs() << "Unhandled type for ICMP_EQ predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Unhandled type for ICMP_NE predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Unhandled type for ICMP_ULT predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Unhandled type for ICMP_SLT predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Unhandled type for ICMP_UGT predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Unhandled type for ICMP_SGT predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Unhandled type for ICMP_ULE predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Unhandled type for ICMP_SLE predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Unhandled type for ICMP_UGE predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Unhandled type for ICMP_SGE predicate: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ 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:
+ dbgs() << "Don't know how to handle this ICmp predicate!\n-->" << I;
+ llvm_unreachable(0);
+ }
+
+ SetValue(&I, R, SF);
+}
+
+#define IMPLEMENT_FCMP(OP, TY) \
+ case Type::TY##TyID: \
+ Dest.IntVal = APInt(1,Src1.TY##Val OP Src2.TY##Val); \
+ break
+
+static GenericValue executeFCMP_OEQ(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(==, Float);
+ IMPLEMENT_FCMP(==, Double);
+ default:
+ dbgs() << "Unhandled type for FCmp EQ instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_ONE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(!=, Float);
+ IMPLEMENT_FCMP(!=, Double);
+
+ default:
+ dbgs() << "Unhandled type for FCmp NE instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_OLE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(<=, Float);
+ IMPLEMENT_FCMP(<=, Double);
+ default:
+ dbgs() << "Unhandled type for FCmp LE instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_OGE(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(>=, Float);
+ IMPLEMENT_FCMP(>=, Double);
+ default:
+ dbgs() << "Unhandled type for FCmp GE instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_OLT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(<, Float);
+ IMPLEMENT_FCMP(<, Double);
+ default:
+ dbgs() << "Unhandled type for FCmp LT instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ return Dest;
+}
+
+static GenericValue executeFCMP_OGT(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_FCMP(>, Float);
+ IMPLEMENT_FCMP(>, Double);
+ default:
+ dbgs() << "Unhandled type for FCmp GT instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+ return Dest;
+}
+
+#define IMPLEMENT_UNORDERED(TY, X,Y) \
+ if (TY->isFloatTy()) { \
+ if (X.FloatVal != X.FloatVal || Y.FloatVal != Y.FloatVal) { \
+ Dest.IntVal = APInt(1,true); \
+ return Dest; \
+ } \
+ } else if (X.DoubleVal != X.DoubleVal || Y.DoubleVal != Y.DoubleVal) { \
+ Dest.IntVal = APInt(1,true); \
+ return Dest; \
+ }
+
+
+static GenericValue executeFCMP_UEQ(GenericValue Src1, GenericValue Src2,
+ 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->isFloatTy())
+ Dest.IntVal = APInt(1,(Src1.FloatVal == Src1.FloatVal &&
+ Src2.FloatVal == Src2.FloatVal));
+ else
+ Dest.IntVal = APInt(1,(Src1.DoubleVal == Src1.DoubleVal &&
+ Src2.DoubleVal == Src2.DoubleVal));
+ return Dest;
+}
+
+static GenericValue executeFCMP_UNO(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
+ GenericValue Dest;
+ if (Ty->isFloatTy())
+ Dest.IntVal = APInt(1,(Src1.FloatVal != Src1.FloatVal ||
+ Src2.FloatVal != Src2.FloatVal));
+ else
+ Dest.IntVal = APInt(1,(Src1.DoubleVal != Src1.DoubleVal ||
+ Src2.DoubleVal != Src2.DoubleVal));
+ return Dest;
+}
+
+void Interpreter::visitFCmpInst(FCmpInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ 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:
+ dbgs() << "Don't know how to handle this FCmp predicate!\n-->" << I;
+ llvm_unreachable(0);
+ }
+
+ SetValue(&I, R, SF);
+}
+
+static GenericValue executeCmpInst(unsigned predicate, GenericValue Src1,
+ GenericValue Src2, 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:
+ dbgs() << "Unhandled Cmp predicate\n";
+ llvm_unreachable(0);
+ }
+}
+
+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: R.IntVal = Src1.IntVal + Src2.IntVal; break;
+ case Instruction::Sub: R.IntVal = Src1.IntVal - Src2.IntVal; break;
+ case Instruction::Mul: R.IntVal = Src1.IntVal * Src2.IntVal; break;
+ case Instruction::FAdd: executeFAddInst(R, Src1, Src2, Ty); break;
+ case Instruction::FSub: executeFSubInst(R, Src1, Src2, Ty); break;
+ case Instruction::FMul: executeFMulInst(R, Src1, Src2, Ty); break;
+ case Instruction::FDiv: executeFDivInst(R, Src1, Src2, Ty); break;
+ case Instruction::FRem: executeFRemInst(R, Src1, Src2, Ty); break;
+ case Instruction::UDiv: R.IntVal = Src1.IntVal.udiv(Src2.IntVal); break;
+ case Instruction::SDiv: R.IntVal = Src1.IntVal.sdiv(Src2.IntVal); break;
+ case Instruction::URem: R.IntVal = Src1.IntVal.urem(Src2.IntVal); break;
+ case Instruction::SRem: R.IntVal = Src1.IntVal.srem(Src2.IntVal); break;
+ case Instruction::And: R.IntVal = Src1.IntVal & Src2.IntVal; break;
+ case Instruction::Or: R.IntVal = Src1.IntVal | Src2.IntVal; break;
+ case Instruction::Xor: R.IntVal = Src1.IntVal ^ Src2.IntVal; break;
+ default:
+ dbgs() << "Don't know how to handle this binary operator!\n-->" << I;
+ llvm_unreachable(0);
+ }
+
+ SetValue(&I, R, SF);
+}
+
+static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2,
+ GenericValue Src3) {
+ return Src1.IntVal == 0 ? Src3 : Src2;
+}
+
+void Interpreter::visitSelectInst(SelectInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
+ GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+ GenericValue Src3 = getOperandValue(I.getOperand(2), SF);
+ GenericValue R = executeSelectInst(Src1, Src2, Src3);
+ SetValue(&I, R, SF);
+}
+
+
+//===----------------------------------------------------------------------===//
+// 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()) {
+ // Save result...
+ if (!CallingSF.Caller.getType()->isVoidTy())
+ 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::getVoidTy(I.getContext());
+ 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())
+ llvm_report_error("Empty stack during unwind!");
+ 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) {
+ llvm_report_error("Program executed an 'unreachable' instruction!");
+}
+
+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);
+}
+
+void Interpreter::visitIndirectBrInst(IndirectBrInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ void *Dest = GVTOP(getOperandValue(I.getAddress(), SF));
+ SwitchToNewBasicBlock((BasicBlock*)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::visitAllocaInst(AllocaInst &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.getTypeAllocSize(Ty);
+
+ // Avoid malloc-ing zero bytes, use max()...
+ unsigned MemToAlloc = std::max(1U, NumElements * TypeSize);
+
+ // Allocate enough memory to hold the type...
+ void *Memory = malloc(MemToAlloc);
+
+ DEBUG(dbgs() << "Allocated Type: " << *Ty << " (" << TypeSize << " bytes) x "
+ << NumElements << " (Total: " << MemToAlloc << ") at "
+ << uintptr_t(Memory) << '\n');
+
+ GenericValue Result = PTOGV(Memory);
+ assert(Result.PointerVal != 0 && "Null pointer returned by malloc!");
+ SetValue(&I, Result, SF);
+
+ if (I.getOpcode() == Instruction::Alloca)
+ ECStack.back().Allocas.add(Memory);
+}
+
+// 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 {
+ assert(BitWidth == 64 && "Invalid index type for getelementptr");
+ Idx = (int64_t)IdxGV.IntVal.getZExtValue();
+ }
+ Total += TD.getTypeAllocSize(ST->getElementType())*Idx;
+ }
+ }
+
+ GenericValue Result;
+ Result.PointerVal = ((char*)getOperandValue(Ptr, SF).PointerVal) + Total;
+ DEBUG(dbgs() << "GEP Index " << Total << " bytes.\n");
+ return Result;
+}
+
+void Interpreter::visitGetElementPtrInst(GetElementPtrInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeGEPOperation(I.getPointerOperand(),
+ gep_type_begin(I), gep_type_end(I), SF), SF);
+}
+
+void Interpreter::visitLoadInst(LoadInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
+ GenericValue *Ptr = (GenericValue*)GVTOP(SRC);
+ GenericValue Result;
+ LoadValueFromMemory(Result, Ptr, I.getType());
+ SetValue(&I, Result, SF);
+ if (I.isVolatile() && PrintVolatile)
+ dbgs() << "Volatile load " << I;
+}
+
+void Interpreter::visitStoreInst(StoreInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ GenericValue Val = getOperandValue(I.getOperand(0), SF);
+ GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
+ StoreValueToMemory(Val, (GenericValue *)GVTOP(SRC),
+ I.getOperand(0)->getType());
+ if (I.isVolatile() && PrintVolatile)
+ dbgs() << "Volatile store: " << I;
+}
+
+//===----------------------------------------------------------------------===//
+// 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));
+ }
+
+ // 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;
+ if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
+ Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue());
+ else
+ Dest.IntVal = Src1.IntVal;
+
+ SetValue(&I, Dest, SF);
+}
+
+void Interpreter::visitLShr(BinaryOperator &I) {
+ ExecutionContext &SF = ECStack.back();
+ GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
+ GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+ GenericValue Dest;
+ if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
+ Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue());
+ else
+ Dest.IntVal = Src1.IntVal;
+
+ SetValue(&I, Dest, SF);
+}
+
+void Interpreter::visitAShr(BinaryOperator &I) {
+ ExecutionContext &SF = ECStack.back();
+ GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
+ GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+ GenericValue Dest;
+ if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
+ Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue());
+ else
+ Dest.IntVal = Src1.IntVal;
+
+ SetValue(&I, Dest, SF);
+}
+
+GenericValue Interpreter::executeTruncInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ const IntegerType *DITy = cast<IntegerType>(DstTy);
+ unsigned DBitWidth = DITy->getBitWidth();
+ Dest.IntVal = Src.IntVal.trunc(DBitWidth);
+ return Dest;
+}
+
+GenericValue Interpreter::executeSExtInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ const IntegerType *DITy = cast<IntegerType>(DstTy);
+ unsigned DBitWidth = DITy->getBitWidth();
+ Dest.IntVal = Src.IntVal.sext(DBitWidth);
+ return Dest;
+}
+
+GenericValue Interpreter::executeZExtInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ const IntegerType *DITy = cast<IntegerType>(DstTy);
+ unsigned DBitWidth = DITy->getBitWidth();
+ Dest.IntVal = Src.IntVal.zext(DBitWidth);
+ return Dest;
+}
+
+GenericValue Interpreter::executeFPTruncInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(SrcVal->getType()->isDoubleTy() && DstTy->isFloatTy() &&
+ "Invalid FPTrunc instruction");
+ Dest.FloatVal = (float) Src.DoubleVal;
+ return Dest;
+}
+
+GenericValue Interpreter::executeFPExtInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF) {
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(SrcVal->getType()->isFloatTy() && DstTy->isDoubleTy() &&
+ "Invalid FPTrunc instruction");
+ Dest.DoubleVal = (double) Src.FloatVal;
+ return Dest;
+}
+
+GenericValue Interpreter::executeFPToUIInst(Value *SrcVal, 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) {
+ uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
+ GenericValue Dest, Src = getOperandValue(SrcVal, SF);
+ assert(isa<PointerType>(SrcVal->getType()) && "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->isFloatTy()) {
+ Dest.IntVal.zext(sizeof(Src.FloatVal) * CHAR_BIT);
+ Dest.IntVal.floatToBits(Src.FloatVal);
+ } else if (SrcTy->isDoubleTy()) {
+ Dest.IntVal.zext(sizeof(Src.DoubleVal) * CHAR_BIT);
+ Dest.IntVal.doubleToBits(Src.DoubleVal);
+ } else if (SrcTy->isInteger()) {
+ Dest.IntVal = Src.IntVal;
+ } else
+ llvm_unreachable("Invalid BitCast");
+ } else if (DstTy->isFloatTy()) {
+ if (SrcTy->isInteger())
+ Dest.FloatVal = Src.IntVal.bitsToFloat();
+ else
+ Dest.FloatVal = Src.FloatVal;
+ } else if (DstTy->isDoubleTy()) {
+ if (SrcTy->isInteger())
+ Dest.DoubleVal = Src.IntVal.bitsToDouble();
+ else
+ Dest.DoubleVal = Src.DoubleVal;
+ } else
+ llvm_unreachable("Invalid Bitcast");
+
+ return Dest;
+}
+
+void Interpreter::visitTruncInst(TruncInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeTruncInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitSExtInst(SExtInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeSExtInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitZExtInst(ZExtInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeZExtInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitFPTruncInst(FPTruncInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeFPTruncInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitFPExtInst(FPExtInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeFPExtInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitUIToFPInst(UIToFPInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeUIToFPInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitSIToFPInst(SIToFPInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeSIToFPInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitFPToUIInst(FPToUIInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeFPToUIInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitFPToSIInst(FPToSIInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeFPToSIInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitPtrToIntInst(PtrToIntInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executePtrToIntInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitIntToPtrInst(IntToPtrInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeIntToPtrInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+void Interpreter::visitBitCastInst(BitCastInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ SetValue(&I, executeBitCastInst(I.getOperand(0), I.getType(), SF), SF);
+}
+
+#define IMPLEMENT_VAARG(TY) \
+ case Type::TY##TyID: Dest.TY##Val = Src.TY##Val; break
+
+void Interpreter::visitVAArgInst(VAArgInst &I) {
+ ExecutionContext &SF = ECStack.back();
+
+ // 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:
+ dbgs() << "Unhandled dest type for vaarg instruction: " << *Ty << "\n";
+ llvm_unreachable(0);
+ }
+
+ // 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: Dest.IntVal = Op0.IntVal + Op1.IntVal; break;
+ case Instruction::Sub: Dest.IntVal = Op0.IntVal - Op1.IntVal; break;
+ case Instruction::Mul: Dest.IntVal = Op0.IntVal * Op1.IntVal; break;
+ case Instruction::FAdd: executeFAddInst(Dest, Op0, Op1, Ty); break;
+ case Instruction::FSub: executeFSubInst(Dest, Op0, Op1, Ty); break;
+ case Instruction::FMul: executeFMulInst(Dest, Op0, Op1, Ty); break;
+ case Instruction::FDiv: executeFDivInst(Dest, Op0, Op1, Ty); break;
+ case Instruction::FRem: executeFRemInst(Dest, Op0, Op1, Ty); break;
+ case Instruction::SDiv: Dest.IntVal = Op0.IntVal.sdiv(Op1.IntVal); break;
+ case Instruction::UDiv: Dest.IntVal = Op0.IntVal.udiv(Op1.IntVal); break;
+ case Instruction::URem: Dest.IntVal = Op0.IntVal.urem(Op1.IntVal); break;
+ case Instruction::SRem: Dest.IntVal = Op0.IntVal.srem(Op1.IntVal); break;
+ case Instruction::And: Dest.IntVal = Op0.IntVal & Op1.IntVal; break;
+ case Instruction::Or: Dest.IntVal = Op0.IntVal | Op1.IntVal; break;
+ case Instruction::Xor: Dest.IntVal = Op0.IntVal ^ Op1.IntVal; break;
+ case Instruction::Shl:
+ Dest.IntVal = Op0.IntVal.shl(Op1.IntVal.getZExtValue());
+ break;
+ case Instruction::LShr:
+ Dest.IntVal = Op0.IntVal.lshr(Op1.IntVal.getZExtValue());
+ break;
+ case Instruction::AShr:
+ Dest.IntVal = Op0.IntVal.ashr(Op1.IntVal.getZExtValue());
+ break;
+ default:
+ dbgs() << "Unhandled ConstantExpr: " << *CE << "\n";
+ llvm_unreachable(0);
+ 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());
+}
+
+
+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;
+
+ DEBUG(dbgs() << "About to interpret: " << I);
+ visit(I); // Dispatch to one of the visit* methods...
+#if 0
+ // This is not safe, as visiting the instruction could lower it and free I.
+DEBUG(
+ if (!isa<CallInst>(I) && !isa<InvokeInst>(I) &&
+ I.getType() != Type::VoidTy) {
+ dbgs() << " --> ";
+ const GenericValue &Val = SF.Values[&I];
+ switch (I.getType()->getTypeID()) {
+ default: llvm_unreachable("Invalid GenericValue Type");
+ case Type::VoidTyID: dbgs() << "void"; break;
+ case Type::FloatTyID: dbgs() << "float " << Val.FloatVal; break;
+ case Type::DoubleTyID: dbgs() << "double " << Val.DoubleVal; break;
+ case Type::PointerTyID: dbgs() << "void* " << intptr_t(Val.PointerVal);
+ break;
+ case Type::IntegerTyID:
+ dbgs() << "i" << Val.IntVal.getBitWidth() << " "
+ << Val.IntVal.toStringUnsigned(10)
+ << " (0x" << Val.IntVal.toStringUnsigned(16) << ")\n";
+ break;
+ }
+ });
+#endif
+ }
+}
diff --git a/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp b/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
new file mode 100644
index 0000000..7b061d3
--- /dev/null
+++ b/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
@@ -0,0 +1,490 @@
+//===-- ExternalFunctions.cpp - Implement External Functions --------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains both code to deal with invoking "external" functions, but
+// also contains code that implements "exported" external functions.
+//
+// There are currently two mechanisms for handling external functions in the
+// Interpreter. The first is to implement lle_* wrapper functions that are
+// specific to well-known library functions which manually translate the
+// arguments from GenericValues and make the call. If such a wrapper does
+// not exist, and libffi is available, then the Interpreter will attempt to
+// invoke the function using libffi, after finding its address.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Interpreter.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/Config/config.h" // Detect libffi
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/System/DynamicLibrary.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/System/Mutex.h"
+#include <csignal>
+#include <cstdio>
+#include <map>
+#include <cmath>
+#include <cstring>
+
+#ifdef HAVE_FFI_CALL
+#ifdef HAVE_FFI_H
+#include <ffi.h>
+#define USE_LIBFFI
+#elif HAVE_FFI_FFI_H
+#include <ffi/ffi.h>
+#define USE_LIBFFI
+#endif
+#endif
+
+using namespace llvm;
+
+static ManagedStatic<sys::Mutex> FunctionsLock;
+
+typedef GenericValue (*ExFunc)(const FunctionType *,
+ const std::vector<GenericValue> &);
+static ManagedStatic<std::map<const Function *, ExFunc> > ExportedFunctions;
+static std::map<std::string, ExFunc> FuncNames;
+
+#ifdef USE_LIBFFI
+typedef void (*RawFunc)();
+static ManagedStatic<std::map<const Function *, RawFunc> > RawFunctions;
+#endif
+
+static Interpreter *TheInterpreter;
+
+static char getTypeID(const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ case Type::VoidTyID: return 'V';
+ case Type::IntegerTyID:
+ switch (cast<IntegerType>(Ty)->getBitWidth()) {
+ case 1: return 'o';
+ case 8: return 'B';
+ case 16: return 'S';
+ case 32: return 'I';
+ case 64: return 'L';
+ default: return 'N';
+ }
+ case Type::FloatTyID: return 'F';
+ case Type::DoubleTyID: return 'D';
+ case Type::PointerTyID: return 'P';
+ case Type::FunctionTyID:return 'M';
+ case Type::StructTyID: return 'T';
+ case Type::ArrayTyID: return 'A';
+ case Type::OpaqueTyID: return 'O';
+ default: return 'U';
+ }
+}
+
+// Try to find address of external function given a Function object.
+// Please note, that interpreter doesn't know how to assemble a
+// real call in general case (this is JIT job), that's why it assumes,
+// that all external functions has the same (and pretty "general") signature.
+// The typical example of such functions are "lle_X_" ones.
+static ExFunc lookupFunction(const Function *F) {
+ // Function not found, look it up... start by figuring out what the
+ // composite function name should be.
+ std::string ExtName = "lle_";
+ const FunctionType *FT = F->getFunctionType();
+ for (unsigned i = 0, e = FT->getNumContainedTypes(); i != e; ++i)
+ ExtName += getTypeID(FT->getContainedType(i));
+ ExtName + "_" + F->getNameStr();
+
+ sys::ScopedLock Writer(*FunctionsLock);
+ ExFunc FnPtr = FuncNames[ExtName];
+ if (FnPtr == 0)
+ FnPtr = FuncNames["lle_X_" + F->getNameStr()];
+ if (FnPtr == 0) // Try calling a generic function... if it exists...
+ FnPtr = (ExFunc)(intptr_t)
+ sys::DynamicLibrary::SearchForAddressOfSymbol("lle_X_"+F->getNameStr());
+ if (FnPtr != 0)
+ ExportedFunctions->insert(std::make_pair(F, FnPtr)); // Cache for later
+ return FnPtr;
+}
+
+#ifdef USE_LIBFFI
+static ffi_type *ffiTypeFor(const Type *Ty) {
+ switch (Ty->getTypeID()) {
+ case Type::VoidTyID: return &ffi_type_void;
+ case Type::IntegerTyID:
+ switch (cast<IntegerType>(Ty)->getBitWidth()) {
+ case 8: return &ffi_type_sint8;
+ case 16: return &ffi_type_sint16;
+ case 32: return &ffi_type_sint32;
+ case 64: return &ffi_type_sint64;
+ }
+ case Type::FloatTyID: return &ffi_type_float;
+ case Type::DoubleTyID: return &ffi_type_double;
+ case Type::PointerTyID: return &ffi_type_pointer;
+ default: break;
+ }
+ // TODO: Support other types such as StructTyID, ArrayTyID, OpaqueTyID, etc.
+ llvm_report_error("Type could not be mapped for use with libffi.");
+ return NULL;
+}
+
+static void *ffiValueFor(const Type *Ty, const GenericValue &AV,
+ void *ArgDataPtr) {
+ switch (Ty->getTypeID()) {
+ case Type::IntegerTyID:
+ switch (cast<IntegerType>(Ty)->getBitWidth()) {
+ case 8: {
+ int8_t *I8Ptr = (int8_t *) ArgDataPtr;
+ *I8Ptr = (int8_t) AV.IntVal.getZExtValue();
+ return ArgDataPtr;
+ }
+ case 16: {
+ int16_t *I16Ptr = (int16_t *) ArgDataPtr;
+ *I16Ptr = (int16_t) AV.IntVal.getZExtValue();
+ return ArgDataPtr;
+ }
+ case 32: {
+ int32_t *I32Ptr = (int32_t *) ArgDataPtr;
+ *I32Ptr = (int32_t) AV.IntVal.getZExtValue();
+ return ArgDataPtr;
+ }
+ case 64: {
+ int64_t *I64Ptr = (int64_t *) ArgDataPtr;
+ *I64Ptr = (int64_t) AV.IntVal.getZExtValue();
+ return ArgDataPtr;
+ }
+ }
+ case Type::FloatTyID: {
+ float *FloatPtr = (float *) ArgDataPtr;
+ *FloatPtr = AV.FloatVal;
+ return ArgDataPtr;
+ }
+ case Type::DoubleTyID: {
+ double *DoublePtr = (double *) ArgDataPtr;
+ *DoublePtr = AV.DoubleVal;
+ return ArgDataPtr;
+ }
+ case Type::PointerTyID: {
+ void **PtrPtr = (void **) ArgDataPtr;
+ *PtrPtr = GVTOP(AV);
+ return ArgDataPtr;
+ }
+ default: break;
+ }
+ // TODO: Support other types such as StructTyID, ArrayTyID, OpaqueTyID, etc.
+ llvm_report_error("Type value could not be mapped for use with libffi.");
+ return NULL;
+}
+
+static bool ffiInvoke(RawFunc Fn, Function *F,
+ const std::vector<GenericValue> &ArgVals,
+ const TargetData *TD, GenericValue &Result) {
+ ffi_cif cif;
+ const FunctionType *FTy = F->getFunctionType();
+ const unsigned NumArgs = F->arg_size();
+
+ // TODO: We don't have type information about the remaining arguments, because
+ // this information is never passed into ExecutionEngine::runFunction().
+ if (ArgVals.size() > NumArgs && F->isVarArg()) {
+ llvm_report_error("Calling external var arg function '" + F->getName()
+ + "' is not supported by the Interpreter.");
+ }
+
+ unsigned ArgBytes = 0;
+
+ std::vector<ffi_type*> args(NumArgs);
+ for (Function::const_arg_iterator A = F->arg_begin(), E = F->arg_end();
+ A != E; ++A) {
+ const unsigned ArgNo = A->getArgNo();
+ const Type *ArgTy = FTy->getParamType(ArgNo);
+ args[ArgNo] = ffiTypeFor(ArgTy);
+ ArgBytes += TD->getTypeStoreSize(ArgTy);
+ }
+
+ SmallVector<uint8_t, 128> ArgData;
+ ArgData.resize(ArgBytes);
+ uint8_t *ArgDataPtr = ArgData.data();
+ SmallVector<void*, 16> values(NumArgs);
+ for (Function::const_arg_iterator A = F->arg_begin(), E = F->arg_end();
+ A != E; ++A) {
+ const unsigned ArgNo = A->getArgNo();
+ const Type *ArgTy = FTy->getParamType(ArgNo);
+ values[ArgNo] = ffiValueFor(ArgTy, ArgVals[ArgNo], ArgDataPtr);
+ ArgDataPtr += TD->getTypeStoreSize(ArgTy);
+ }
+
+ const Type *RetTy = FTy->getReturnType();
+ ffi_type *rtype = ffiTypeFor(RetTy);
+
+ if (ffi_prep_cif(&cif, FFI_DEFAULT_ABI, NumArgs, rtype, &args[0]) == FFI_OK) {
+ SmallVector<uint8_t, 128> ret;
+ if (RetTy->getTypeID() != Type::VoidTyID)
+ ret.resize(TD->getTypeStoreSize(RetTy));
+ ffi_call(&cif, Fn, ret.data(), values.data());
+ switch (RetTy->getTypeID()) {
+ case Type::IntegerTyID:
+ switch (cast<IntegerType>(RetTy)->getBitWidth()) {
+ case 8: Result.IntVal = APInt(8 , *(int8_t *) ret.data()); break;
+ case 16: Result.IntVal = APInt(16, *(int16_t*) ret.data()); break;
+ case 32: Result.IntVal = APInt(32, *(int32_t*) ret.data()); break;
+ case 64: Result.IntVal = APInt(64, *(int64_t*) ret.data()); break;
+ }
+ break;
+ case Type::FloatTyID: Result.FloatVal = *(float *) ret.data(); break;
+ case Type::DoubleTyID: Result.DoubleVal = *(double*) ret.data(); break;
+ case Type::PointerTyID: Result.PointerVal = *(void **) ret.data(); break;
+ default: break;
+ }
+ return true;
+ }
+
+ return false;
+}
+#endif // USE_LIBFFI
+
+GenericValue Interpreter::callExternalFunction(Function *F,
+ const std::vector<GenericValue> &ArgVals) {
+ TheInterpreter = this;
+
+ FunctionsLock->acquire();
+
+ // Do a lookup to see if the function is in our cache... this should just be a
+ // deferred annotation!
+ std::map<const Function *, ExFunc>::iterator FI = ExportedFunctions->find(F);
+ if (ExFunc Fn = (FI == ExportedFunctions->end()) ? lookupFunction(F)
+ : FI->second) {
+ FunctionsLock->release();
+ return Fn(F->getFunctionType(), ArgVals);
+ }
+
+#ifdef USE_LIBFFI
+ std::map<const Function *, RawFunc>::iterator RF = RawFunctions->find(F);
+ RawFunc RawFn;
+ if (RF == RawFunctions->end()) {
+ RawFn = (RawFunc)(intptr_t)
+ sys::DynamicLibrary::SearchForAddressOfSymbol(F->getName());
+ if (RawFn != 0)
+ RawFunctions->insert(std::make_pair(F, RawFn)); // Cache for later
+ } else {
+ RawFn = RF->second;
+ }
+
+ FunctionsLock->release();
+
+ GenericValue Result;
+ if (RawFn != 0 && ffiInvoke(RawFn, F, ArgVals, getTargetData(), Result))
+ return Result;
+#endif // USE_LIBFFI
+
+ if (F->getName() == "__main")
+ errs() << "Tried to execute an unknown external function: "
+ << F->getType()->getDescription() << " __main\n";
+ else
+ llvm_report_error("Tried to execute an unknown external function: " +
+ F->getType()->getDescription() + " " +F->getName());
+#ifndef USE_LIBFFI
+ errs() << "Recompiling LLVM with --enable-libffi might help.\n";
+#endif
+ return GenericValue();
+}
+
+
+//===----------------------------------------------------------------------===//
+// Functions "exported" to the running application...
+//
+
+// Visual Studio warns about returning GenericValue in extern "C" linkage
+#ifdef _MSC_VER
+ #pragma warning(disable : 4190)
+#endif
+
+extern "C" { // Don't add C++ manglings to llvm mangling :)
+
+// void atexit(Function*)
+GenericValue lle_X_atexit(const FunctionType *FT,
+ const std::vector<GenericValue> &Args) {
+ assert(Args.size() == 1);
+ TheInterpreter->addAtExitHandler((Function*)GVTOP(Args[0]));
+ GenericValue GV;
+ GV.IntVal = 0;
+ return GV;
+}
+
+// void exit(int)
+GenericValue lle_X_exit(const FunctionType *FT,
+ const std::vector<GenericValue> &Args) {
+ TheInterpreter->exitCalled(Args[0]);
+ return GenericValue();
+}
+
+// void abort(void)
+GenericValue lle_X_abort(const FunctionType *FT,
+ const std::vector<GenericValue> &Args) {
+ //FIXME: should we report or raise here?
+ //llvm_report_error("Interpreted program raised SIGABRT");
+ raise (SIGABRT);
+ return GenericValue();
+}
+
+// int sprintf(char *, const char *, ...) - a very rough implementation to make
+// output useful.
+GenericValue lle_X_sprintf(const FunctionType *FT,
+ const std::vector<GenericValue> &Args) {
+ char *OutputBuffer = (char *)GVTOP(Args[0]);
+ const char *FmtStr = (const char *)GVTOP(Args[1]);
+ unsigned ArgNo = 2;
+
+ // printf should return # chars printed. This is completely incorrect, but
+ // close enough for now.
+ GenericValue GV;
+ GV.IntVal = APInt(32, strlen(FmtStr));
+ while (1) {
+ switch (*FmtStr) {
+ case 0: return GV; // Null terminator...
+ default: // Normal nonspecial character
+ sprintf(OutputBuffer++, "%c", *FmtStr++);
+ break;
+ case '\\': { // Handle escape codes
+ sprintf(OutputBuffer, "%c%c", *FmtStr, *(FmtStr+1));
+ FmtStr += 2; OutputBuffer += 2;
+ break;
+ }
+ case '%': { // Handle format specifiers
+ char FmtBuf[100] = "", Buffer[1000] = "";
+ char *FB = FmtBuf;
+ *FB++ = *FmtStr++;
+ char Last = *FB++ = *FmtStr++;
+ unsigned HowLong = 0;
+ while (Last != 'c' && Last != 'd' && Last != 'i' && Last != 'u' &&
+ Last != 'o' && Last != 'x' && Last != 'X' && Last != 'e' &&
+ Last != 'E' && Last != 'g' && Last != 'G' && Last != 'f' &&
+ Last != 'p' && Last != 's' && Last != '%') {
+ if (Last == 'l' || Last == 'L') HowLong++; // Keep track of l's
+ Last = *FB++ = *FmtStr++;
+ }
+ *FB = 0;
+
+ switch (Last) {
+ case '%':
+ memcpy(Buffer, "%", 2); break;
+ case 'c':
+ sprintf(Buffer, FmtBuf, uint32_t(Args[ArgNo++].IntVal.getZExtValue()));
+ break;
+ case 'd': case 'i':
+ case 'u': case 'o':
+ case 'x': case 'X':
+ if (HowLong >= 1) {
+ if (HowLong == 1 &&
+ TheInterpreter->getTargetData()->getPointerSizeInBits() == 64 &&
+ sizeof(long) < sizeof(int64_t)) {
+ // Make sure we use %lld with a 64 bit argument because we might be
+ // compiling LLI on a 32 bit compiler.
+ unsigned Size = strlen(FmtBuf);
+ FmtBuf[Size] = FmtBuf[Size-1];
+ FmtBuf[Size+1] = 0;
+ FmtBuf[Size-1] = 'l';
+ }
+ sprintf(Buffer, FmtBuf, Args[ArgNo++].IntVal.getZExtValue());
+ } else
+ sprintf(Buffer, FmtBuf,uint32_t(Args[ArgNo++].IntVal.getZExtValue()));
+ break;
+ case 'e': case 'E': case 'g': case 'G': case 'f':
+ sprintf(Buffer, FmtBuf, Args[ArgNo++].DoubleVal); break;
+ case 'p':
+ sprintf(Buffer, FmtBuf, (void*)GVTOP(Args[ArgNo++])); break;
+ case 's':
+ sprintf(Buffer, FmtBuf, (char*)GVTOP(Args[ArgNo++])); break;
+ default:
+ errs() << "<unknown printf code '" << *FmtStr << "'!>";
+ ArgNo++; break;
+ }
+ size_t Len = strlen(Buffer);
+ memcpy(OutputBuffer, Buffer, Len + 1);
+ OutputBuffer += Len;
+ }
+ break;
+ }
+ }
+ return GV;
+}
+
+// int printf(const char *, ...) - a very rough implementation to make output
+// useful.
+GenericValue lle_X_printf(const FunctionType *FT,
+ const std::vector<GenericValue> &Args) {
+ char Buffer[10000];
+ std::vector<GenericValue> NewArgs;
+ NewArgs.push_back(PTOGV((void*)&Buffer[0]));
+ NewArgs.insert(NewArgs.end(), Args.begin(), Args.end());
+ GenericValue GV = lle_X_sprintf(FT, NewArgs);
+ outs() << Buffer;
+ return GV;
+}
+
+// int sscanf(const char *format, ...);
+GenericValue lle_X_sscanf(const FunctionType *FT,
+ const std::vector<GenericValue> &args) {
+ assert(args.size() < 10 && "Only handle up to 10 args to sscanf right now!");
+
+ char *Args[10];
+ for (unsigned i = 0; i < args.size(); ++i)
+ Args[i] = (char*)GVTOP(args[i]);
+
+ GenericValue GV;
+ GV.IntVal = APInt(32, sscanf(Args[0], Args[1], Args[2], Args[3], Args[4],
+ Args[5], Args[6], Args[7], Args[8], Args[9]));
+ return GV;
+}
+
+// int scanf(const char *format, ...);
+GenericValue lle_X_scanf(const FunctionType *FT,
+ const std::vector<GenericValue> &args) {
+ assert(args.size() < 10 && "Only handle up to 10 args to scanf right now!");
+
+ char *Args[10];
+ for (unsigned i = 0; i < args.size(); ++i)
+ Args[i] = (char*)GVTOP(args[i]);
+
+ GenericValue GV;
+ GV.IntVal = APInt(32, scanf( Args[0], Args[1], Args[2], Args[3], Args[4],
+ Args[5], Args[6], Args[7], Args[8], Args[9]));
+ return GV;
+}
+
+// int fprintf(FILE *, const char *, ...) - a very rough implementation to make
+// output useful.
+GenericValue lle_X_fprintf(const FunctionType *FT,
+ const std::vector<GenericValue> &Args) {
+ assert(Args.size() >= 2);
+ char Buffer[10000];
+ std::vector<GenericValue> NewArgs;
+ NewArgs.push_back(PTOGV(Buffer));
+ NewArgs.insert(NewArgs.end(), Args.begin()+1, Args.end());
+ GenericValue GV = lle_X_sprintf(FT, NewArgs);
+
+ fputs(Buffer, (FILE *) GVTOP(Args[0]));
+ return GV;
+}
+
+} // End extern "C"
+
+// Done with externals; turn the warning back on
+#ifdef _MSC_VER
+ #pragma warning(default: 4190)
+#endif
+
+
+void Interpreter::initializeExternalFunctions() {
+ sys::ScopedLock Writer(*FunctionsLock);
+ FuncNames["lle_X_atexit"] = lle_X_atexit;
+ FuncNames["lle_X_exit"] = lle_X_exit;
+ FuncNames["lle_X_abort"] = lle_X_abort;
+
+ FuncNames["lle_X_printf"] = lle_X_printf;
+ FuncNames["lle_X_sprintf"] = lle_X_sprintf;
+ FuncNames["lle_X_sscanf"] = lle_X_sscanf;
+ FuncNames["lle_X_scanf"] = lle_X_scanf;
+ FuncNames["lle_X_fprintf"] = lle_X_fprintf;
+}
diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.cpp b/lib/ExecutionEngine/Interpreter/Interpreter.cpp
new file mode 100644
index 0000000..43e3453
--- /dev/null
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.cpp
@@ -0,0 +1,98 @@
+//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the top-level functionality for the LLVM interpreter.
+// This interpreter is designed to be a very simple, portable, inefficient
+// interpreter.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Interpreter.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include <cstring>
+using namespace llvm;
+
+namespace {
+
+static struct RegisterInterp {
+ RegisterInterp() { Interpreter::Register(); }
+} InterpRegistrator;
+
+}
+
+extern "C" void LLVMLinkInInterpreter() { }
+
+/// create - Create a new interpreter object. This can never fail.
+///
+ExecutionEngine *Interpreter::create(Module *M, std::string* ErrStr) {
+ // Tell this Module to materialize everything and release the GVMaterializer.
+ if (M->MaterializeAllPermanently(ErrStr))
+ // We got an error, just return 0
+ return 0;
+
+ return new Interpreter(M);
+}
+
+//===----------------------------------------------------------------------===//
+// Interpreter ctor - Initialize stuff
+//
+Interpreter::Interpreter(Module *M)
+ : ExecutionEngine(M), TD(M) {
+
+ memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
+ setTargetData(&TD);
+ // Initialize the "backend"
+ initializeExecutionEngine();
+ initializeExternalFunctions();
+ emitGlobals();
+
+ IL = new IntrinsicLowering(TD);
+}
+
+Interpreter::~Interpreter() {
+ delete IL;
+}
+
+void Interpreter::runAtExitHandlers () {
+ while (!AtExitHandlers.empty()) {
+ callFunction(AtExitHandlers.back(), std::vector<GenericValue>());
+ AtExitHandlers.pop_back();
+ run();
+ }
+}
+
+/// run - Start execution with the specified function and arguments.
+///
+GenericValue
+Interpreter::runFunction(Function *F,
+ const std::vector<GenericValue> &ArgValues) {
+ assert (F && "Function *F was null at entry to run()");
+
+ // Try extra hard not to pass extra args to a function that isn't
+ // expecting them. C programmers frequently bend the rules and
+ // declare main() with fewer parameters than it actually gets
+ // passed, and the interpreter barfs if you pass a function more
+ // parameters than it is declared to take. This does not attempt to
+ // take into account gratuitous differences in declared types,
+ // though.
+ std::vector<GenericValue> ActualArgs;
+ const unsigned ArgCount = F->getFunctionType()->getNumParams();
+ for (unsigned i = 0; i < ArgCount; ++i)
+ ActualArgs.push_back(ArgValues[i]);
+
+ // Set up the function call.
+ callFunction(F, ActualArgs);
+
+ // Start executing the function.
+ run();
+
+ return ExitValue;
+}
diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.h b/lib/ExecutionEngine/Interpreter/Interpreter.h
new file mode 100644
index 0000000..bc4200b
--- /dev/null
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.h
@@ -0,0 +1,244 @@
+//===-- Interpreter.h ------------------------------------------*- C++ -*--===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header file defines the interpreter structure
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLI_INTERPRETER_H
+#define LLI_INTERPRETER_H
+
+#include "llvm/Function.h"
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ExecutionEngine/GenericValue.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Support/CallSite.h"
+#include "llvm/System/DataTypes.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/InstVisitor.h"
+#include "llvm/Support/raw_ostream.h"
+namespace llvm {
+
+class IntrinsicLowering;
+struct FunctionInfo;
+template<typename T> class generic_gep_type_iterator;
+class ConstantExpr;
+typedef generic_gep_type_iterator<User::const_op_iterator> gep_type_iterator;
+
+
+// AllocaHolder - Object to track all of the blocks of memory allocated by
+// alloca. When the function returns, this object is popped off the execution
+// stack, which causes the dtor to be run, which frees all the alloca'd memory.
+//
+class AllocaHolder {
+ friend class AllocaHolderHandle;
+ std::vector<void*> Allocations;
+ unsigned RefCnt;
+public:
+ AllocaHolder() : RefCnt(0) {}
+ void add(void *mem) { Allocations.push_back(mem); }
+ ~AllocaHolder() {
+ for (unsigned i = 0; i < Allocations.size(); ++i)
+ free(Allocations[i]);
+ }
+};
+
+// AllocaHolderHandle gives AllocaHolder value semantics so we can stick it into
+// a vector...
+//
+class AllocaHolderHandle {
+ AllocaHolder *H;
+public:
+ AllocaHolderHandle() : H(new AllocaHolder()) { H->RefCnt++; }
+ AllocaHolderHandle(const AllocaHolderHandle &AH) : H(AH.H) { H->RefCnt++; }
+ ~AllocaHolderHandle() { if (--H->RefCnt == 0) delete H; }
+
+ void add(void *mem) { H->add(mem); }
+};
+
+typedef std::vector<GenericValue> ValuePlaneTy;
+
+// ExecutionContext struct - This struct represents one stack frame currently
+// executing.
+//
+struct ExecutionContext {
+ Function *CurFunction;// The currently executing function
+ BasicBlock *CurBB; // The currently executing BB
+ BasicBlock::iterator CurInst; // The next instruction to execute
+ std::map<Value *, GenericValue> Values; // LLVM values used in this invocation
+ std::vector<GenericValue> VarArgs; // Values passed through an ellipsis
+ CallSite Caller; // Holds the call that called subframes.
+ // NULL if main func or debugger invoked fn
+ AllocaHolderHandle Allocas; // Track memory allocated by alloca
+};
+
+// Interpreter - This class represents the entirety of the interpreter.
+//
+class Interpreter : public ExecutionEngine, public InstVisitor<Interpreter> {
+ GenericValue ExitValue; // The return value of the called function
+ TargetData TD;
+ IntrinsicLowering *IL;
+
+ // The runtime stack of executing code. The top of the stack is the current
+ // function record.
+ std::vector<ExecutionContext> ECStack;
+
+ // AtExitHandlers - List of functions to call when the program exits,
+ // registered with the atexit() library function.
+ std::vector<Function*> AtExitHandlers;
+
+public:
+ explicit Interpreter(Module *M);
+ ~Interpreter();
+
+ /// runAtExitHandlers - Run any functions registered by the program's calls to
+ /// atexit(3), which we intercept and store in AtExitHandlers.
+ ///
+ void runAtExitHandlers();
+
+ static void Register() {
+ InterpCtor = create;
+ }
+
+ /// create - Create an interpreter ExecutionEngine. This can never fail.
+ ///
+ static ExecutionEngine *create(Module *M, std::string *ErrorStr = 0);
+
+ /// run - Start execution with the specified function and arguments.
+ ///
+ virtual GenericValue runFunction(Function *F,
+ const std::vector<GenericValue> &ArgValues);
+
+ /// recompileAndRelinkFunction - For the interpreter, functions are always
+ /// up-to-date.
+ ///
+ virtual void *recompileAndRelinkFunction(Function *F) {
+ return getPointerToFunction(F);
+ }
+
+ /// freeMachineCodeForFunction - The interpreter does not generate any code.
+ ///
+ void freeMachineCodeForFunction(Function *F) { }
+
+ // Methods used to execute code:
+ // Place a call on the stack
+ void callFunction(Function *F, const std::vector<GenericValue> &ArgVals);
+ void run(); // Execute instructions until nothing left to do
+
+ // Opcode Implementations
+ void visitReturnInst(ReturnInst &I);
+ void visitBranchInst(BranchInst &I);
+ void visitSwitchInst(SwitchInst &I);
+ void visitIndirectBrInst(IndirectBrInst &I);
+
+ void visitBinaryOperator(BinaryOperator &I);
+ void visitICmpInst(ICmpInst &I);
+ void visitFCmpInst(FCmpInst &I);
+ void visitAllocaInst(AllocaInst &I);
+ void visitLoadInst(LoadInst &I);
+ void visitStoreInst(StoreInst &I);
+ void visitGetElementPtrInst(GetElementPtrInst &I);
+ void visitPHINode(PHINode &PN) {
+ llvm_unreachable("PHI nodes already handled!");
+ }
+ void visitTruncInst(TruncInst &I);
+ void visitZExtInst(ZExtInst &I);
+ void visitSExtInst(SExtInst &I);
+ void visitFPTruncInst(FPTruncInst &I);
+ void visitFPExtInst(FPExtInst &I);
+ void visitUIToFPInst(UIToFPInst &I);
+ void visitSIToFPInst(SIToFPInst &I);
+ void visitFPToUIInst(FPToUIInst &I);
+ void visitFPToSIInst(FPToSIInst &I);
+ void visitPtrToIntInst(PtrToIntInst &I);
+ void visitIntToPtrInst(IntToPtrInst &I);
+ void visitBitCastInst(BitCastInst &I);
+ void visitSelectInst(SelectInst &I);
+
+
+ void visitCallSite(CallSite CS);
+ void visitCallInst(CallInst &I) { visitCallSite (CallSite (&I)); }
+ void visitInvokeInst(InvokeInst &I) { visitCallSite (CallSite (&I)); }
+ void visitUnwindInst(UnwindInst &I);
+ void visitUnreachableInst(UnreachableInst &I);
+
+ void visitShl(BinaryOperator &I);
+ void visitLShr(BinaryOperator &I);
+ void visitAShr(BinaryOperator &I);
+
+ void visitVAArgInst(VAArgInst &I);
+ void visitInstruction(Instruction &I) {
+ errs() << I;
+ llvm_unreachable("Instruction not interpretable yet!");
+ }
+
+ GenericValue callExternalFunction(Function *F,
+ const std::vector<GenericValue> &ArgVals);
+ void exitCalled(GenericValue GV);
+
+ void addAtExitHandler(Function *F) {
+ AtExitHandlers.push_back(F);
+ }
+
+ GenericValue *getFirstVarArg () {
+ return &(ECStack.back ().VarArgs[0]);
+ }
+
+ //FIXME: private:
+public:
+ GenericValue executeGEPOperation(Value *Ptr, gep_type_iterator I,
+ gep_type_iterator E, ExecutionContext &SF);
+
+private: // Helper functions
+ // SwitchToNewBasicBlock - Start execution in a new basic block and run any
+ // PHI nodes in the top of the block. This is used for intraprocedural
+ // control flow.
+ //
+ void SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF);
+
+ void *getPointerToFunction(Function *F) { return (void*)F; }
+ void *getPointerToBasicBlock(BasicBlock *BB) { return (void*)BB; }
+
+ void initializeExecutionEngine() { }
+ void initializeExternalFunctions();
+ GenericValue getConstantExprValue(ConstantExpr *CE, ExecutionContext &SF);
+ GenericValue getOperandValue(Value *V, ExecutionContext &SF);
+ GenericValue executeTruncInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeSExtInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeZExtInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeFPTruncInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeFPExtInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeFPToUIInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeFPToSIInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeUIToFPInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeSIToFPInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executePtrToIntInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeIntToPtrInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeBitCastInst(Value *SrcVal, const Type *DstTy,
+ ExecutionContext &SF);
+ GenericValue executeCastOperation(Instruction::CastOps opcode, Value *SrcVal,
+ const Type *Ty, ExecutionContext &SF);
+ void popStackAndReturnValueToCaller(const Type *RetTy, GenericValue Result);
+
+};
+
+} // End llvm namespace
+
+#endif
diff --git a/lib/ExecutionEngine/Interpreter/Makefile b/lib/ExecutionEngine/Interpreter/Makefile
new file mode 100644
index 0000000..5def136
--- /dev/null
+++ b/lib/ExecutionEngine/Interpreter/Makefile
@@ -0,0 +1,13 @@
+##===- lib/ExecutionEngine/Interpreter/Makefile ------------*- Makefile -*-===##
+#
+# The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../..
+LIBRARYNAME = LLVMInterpreter
+
+include $(LEVEL)/Makefile.common