diff options
Diffstat (limited to 'lib/ExecutionEngine/Interpreter')
| -rw-r--r-- | lib/ExecutionEngine/Interpreter/CMakeLists.txt | 5 | ||||
| -rw-r--r-- | lib/ExecutionEngine/Interpreter/Execution.cpp | 1382 | ||||
| -rw-r--r-- | lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp | 542 | ||||
| -rw-r--r-- | lib/ExecutionEngine/Interpreter/Interpreter.cpp | 104 | ||||
| -rw-r--r-- | lib/ExecutionEngine/Interpreter/Interpreter.h | 241 | ||||
| -rw-r--r-- | lib/ExecutionEngine/Interpreter/Makefile | 12 |
6 files changed, 2286 insertions, 0 deletions
diff --git a/lib/ExecutionEngine/Interpreter/CMakeLists.txt b/lib/ExecutionEngine/Interpreter/CMakeLists.txt new file mode 100644 index 0000000000000..626e804e78e68 --- /dev/null +++ b/lib/ExecutionEngine/Interpreter/CMakeLists.txt @@ -0,0 +1,5 @@ +add_partially_linked_object(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 0000000000000..765fed248f988 --- /dev/null +++ b/lib/ExecutionEngine/Interpreter/Execution.cpp @@ -0,0 +1,1382 @@ +//===-- 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/MathExtras.h" +#include <algorithm> +#include <cmath> +#include <cstring> +using namespace llvm; + +STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed"); +static Interpreter *TheEE = 0; + +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 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.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); + + 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 { + 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; + 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); + if (I.isVolatile() && PrintVolatile) + cerr << "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) + cerr << "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)); + // 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 (CS.paramHasAttr(pNum, Attribute::ZExt)) + ArgVals.back().IntVal = ArgVals.back().IntVal.zext(32); + else if (CS.paramHasAttr(pNum, Attribute::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; + 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() == 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) { + GenericValue Dest, Src = getOperandValue(SrcVal, SF); + assert(SrcVal->getType() == 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) { + 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 == Type::FloatTy) { + Dest.IntVal.zext(sizeof(Src.FloatVal) * CHAR_BIT); + Dest.IntVal.floatToBits(Src.FloatVal); + } else if (SrcTy == Type::DoubleTy) { + Dest.IntVal.zext(sizeof(Src.DoubleVal) * CHAR_BIT); + 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()); +} + + +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... +#if 0 + // This is not safe, as visiting the instruction could lower it and free I. +#ifndef NDEBUG + if (!isa<CallInst>(I) && !isa<InvokeInst>(I) && + I.getType() != Type::VoidTy) { + DOUT << " --> "; + const GenericValue &Val = SF.Values[&I]; + switch (I.getType()->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.toStringUnsigned(10) + << " (0x" << Val.IntVal.toStringUnsigned(16) << ")\n"; + break; + } + } +#endif +#endif + } +} diff --git a/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp b/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp new file mode 100644 index 0000000000000..160f1ba9f6c51 --- /dev/null +++ b/lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp @@ -0,0 +1,542 @@ +//===-- 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/Streams.h" +#include "llvm/System/DynamicLibrary.h" +#include "llvm/Target/TargetData.h" +#include "llvm/Support/ManagedStatic.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; + +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)(void); +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->getName(); + + ExFunc FnPtr = FuncNames[ExtName]; + if (FnPtr == 0) + FnPtr = FuncNames["lle_X_"+F->getName()]; + if (FnPtr == 0) // Try calling a generic function... if it exists... + FnPtr = (ExFunc)(intptr_t)sys::DynamicLibrary::SearchForAddressOfSymbol( + ("lle_X_"+F->getName()).c_str()); + 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. + cerr << "Type could not be mapped for use with libffi.\n"; + abort(); + 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.DoubleVal; + 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. + cerr << "Type value could not be mapped for use with libffi.\n"; + abort(); + 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()) { + cerr << "Calling external var arg function '" << F->getName() + << "' is not supported by the Interpreter.\n"; + abort(); + } + + 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); + } + + uint8_t *ArgData = (uint8_t*) alloca(ArgBytes); + uint8_t *ArgDataPtr = ArgData; + std::vector<void*> 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) { + void *ret = NULL; + if (RetTy->getTypeID() != Type::VoidTyID) + ret = alloca(TD->getTypeStoreSize(RetTy)); + ffi_call(&cif, Fn, ret, &values[0]); + switch (RetTy->getTypeID()) { + case Type::IntegerTyID: + switch (cast<IntegerType>(RetTy)->getBitWidth()) { + case 8: Result.IntVal = APInt(8 , *(int8_t *) ret); break; + case 16: Result.IntVal = APInt(16, *(int16_t*) ret); break; + case 32: Result.IntVal = APInt(32, *(int32_t*) ret); break; + case 64: Result.IntVal = APInt(64, *(int64_t*) ret); break; + } + break; + case Type::FloatTyID: Result.FloatVal = *(float *) ret; break; + case Type::DoubleTyID: Result.DoubleVal = *(double*) ret; break; + case Type::PointerTyID: Result.PointerVal = *(void **) ret; break; + default: break; + } + return true; + } + + return false; +} +#endif // USE_LIBFFI + +GenericValue Interpreter::callExternalFunction(Function *F, + const std::vector<GenericValue> &ArgVals) { + TheInterpreter = this; + + // 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) + 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; + } + + GenericValue Result; + if (RawFn != 0 && ffiInvoke(RawFn, F, ArgVals, getTargetData(), Result)) + return Result; +#endif // USE_LIBFFI + + cerr << "Tried to execute an unknown external function: " + << F->getType()->getDescription() << " " << F->getName() << "\n"; + if (F->getName() != "__main") + abort(); + return GenericValue(); +} + + +//===----------------------------------------------------------------------===// +// Functions "exported" to the running application... +// +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) { + 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 '%': + strcpy(Buffer, "%"); 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: cerr << "<unknown printf code '" << *FmtStr << "'!>"; + ArgNo++; break; + } + strcpy(OutputBuffer, Buffer); + OutputBuffer += strlen(Buffer); + } + 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); + cout << Buffer; + return GV; +} + +static void ByteswapSCANFResults(const char *Fmt, void *Arg0, void *Arg1, + void *Arg2, void *Arg3, void *Arg4, void *Arg5, + void *Arg6, void *Arg7, void *Arg8) { + void *Args[] = { Arg0, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7, Arg8, 0 }; + + // Loop over the format string, munging read values as appropriate (performs + // byteswaps as necessary). + unsigned ArgNo = 0; + while (*Fmt) { + if (*Fmt++ == '%') { + // Read any flag characters that may be present... + bool Suppress = false; + bool Half = false; + bool Long = false; + bool LongLong = false; // long long or long double + + while (1) { + switch (*Fmt++) { + case '*': Suppress = true; break; + case 'a': /*Allocate = true;*/ break; // We don't need to track this + case 'h': Half = true; break; + case 'l': Long = true; break; + case 'q': + case 'L': LongLong = true; break; + default: + if (Fmt[-1] > '9' || Fmt[-1] < '0') // Ignore field width specs + goto Out; + } + } + Out: + + // Read the conversion character + if (!Suppress && Fmt[-1] != '%') { // Nothing to do? + unsigned Size = 0; + const Type *Ty = 0; + + switch (Fmt[-1]) { + case 'i': case 'o': case 'u': case 'x': case 'X': case 'n': case 'p': + case 'd': + if (Long || LongLong) { + Size = 8; Ty = Type::Int64Ty; + } else if (Half) { + Size = 4; Ty = Type::Int16Ty; + } else { + Size = 4; Ty = Type::Int32Ty; + } + break; + + case 'e': case 'g': case 'E': + case 'f': + if (Long || LongLong) { + Size = 8; Ty = Type::DoubleTy; + } else { + Size = 4; Ty = Type::FloatTy; + } + break; + + case 's': case 'c': case '[': // No byteswap needed + Size = 1; + Ty = Type::Int8Ty; + break; + + default: break; + } + + if (Size) { + GenericValue GV; + void *Arg = Args[ArgNo++]; + memcpy(&GV, Arg, Size); + TheInterpreter->StoreValueToMemory(GV, (GenericValue*)Arg, Ty); + } + } + } + } +} + +// 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])); + ByteswapSCANFResults(Args[1], Args[2], Args[3], Args[4], + Args[5], Args[6], Args[7], Args[8], Args[9], 0); + 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])); + ByteswapSCANFResults(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" + + +void Interpreter::initializeExternalFunctions() { + 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 0000000000000..ded65d5467017 --- /dev/null +++ b/lib/ExecutionEngine/Interpreter/Interpreter.cpp @@ -0,0 +1,104 @@ +//===- 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 "llvm/ModuleProvider.h" +#include <cstring> +using namespace llvm; + +namespace { + +static struct RegisterInterp { + RegisterInterp() { Interpreter::Register(); } +} InterpRegistrator; + +} + +namespace llvm { + void LinkInInterpreter() { + } +} + +/// create - Create a new interpreter object. This can never fail. +/// +ExecutionEngine *Interpreter::create(ModuleProvider *MP, std::string* ErrStr, + CodeGenOpt::Level OptLevel /*unused*/) { + // Tell this ModuleProvide to materialize and release the module + if (!MP->materializeModule(ErrStr)) + // We got an error, just return 0 + return 0; + + return new Interpreter(MP); +} + +//===----------------------------------------------------------------------===// +// Interpreter ctor - Initialize stuff +// +Interpreter::Interpreter(ModuleProvider *M) + : ExecutionEngine(M), TD(M->getModule()) { + + 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 0000000000000..8a285ecb82c00 --- /dev/null +++ b/lib/ExecutionEngine/Interpreter/Interpreter.h @@ -0,0 +1,241 @@ +//===-- 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/Support/InstVisitor.h" +#include "llvm/Support/CallSite.h" +#include "llvm/Target/TargetData.h" +#include "llvm/Support/DataTypes.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(ModuleProvider *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(ModuleProvider *M, std::string *ErrorStr = 0, + CodeGenOpt::Level = CodeGenOpt::Default); + + /// 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 visitBinaryOperator(BinaryOperator &I); + void visitICmpInst(ICmpInst &I); + void visitFCmpInst(FCmpInst &I); + void visitAllocationInst(AllocationInst &I); + void visitFreeInst(FreeInst &I); + void visitLoadInst(LoadInst &I); + void visitStoreInst(StoreInst &I); + void visitGetElementPtrInst(GetElementPtrInst &I); + void visitPHINode(PHINode &PN) { assert(0 && "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) { + cerr << I; + assert(0 && "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 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 0000000000000..5f937c3ad6f29 --- /dev/null +++ b/lib/ExecutionEngine/Interpreter/Makefile @@ -0,0 +1,12 @@ +##===- 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 |