| //===-- Execution.cpp - Implement code to simulate the program ------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains the actual instruction interpreter. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "interpreter" |
| #include "Interpreter.h" |
| #include "llvm/Constants.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Instructions.h" |
| #include "llvm/CodeGen/IntrinsicLowering.h" |
| #include "llvm/Support/GetElementPtrTypeIterator.h" |
| #include "llvm/ADT/Statistic.h" |
| #include "llvm/Support/Debug.h" |
| #include <cmath> |
| using namespace llvm; |
| |
| STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed"); |
| static Interpreter *TheEE = 0; |
| |
| |
| //===----------------------------------------------------------------------===// |
| // Value Manipulation code |
| //===----------------------------------------------------------------------===// |
| |
| static GenericValue executeAddInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeSubInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeMulInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeUDivInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeSDivInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeFDivInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeURemInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeSRemInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeFRemInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeAndInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeOrInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeXorInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeCmpInst(unsigned predicate, GenericValue Src1, |
| GenericValue Src2, const Type *Ty); |
| static GenericValue executeShlInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeLShrInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeAShrInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty); |
| static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2, |
| GenericValue Src3); |
| |
| GenericValue Interpreter::getConstantExprValue (ConstantExpr *CE, |
| ExecutionContext &SF) { |
| switch (CE->getOpcode()) { |
| case Instruction::Trunc: |
| case Instruction::ZExt: |
| case Instruction::SExt: |
| case Instruction::FPTrunc: |
| case Instruction::FPExt: |
| case Instruction::UIToFP: |
| case Instruction::SIToFP: |
| case Instruction::FPToUI: |
| case Instruction::FPToSI: |
| case Instruction::PtrToInt: |
| case Instruction::IntToPtr: |
| case Instruction::BitCast: |
| return executeCastOperation(Instruction::CastOps(CE->getOpcode()), |
| 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::Add: |
| return executeAddInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::Sub: |
| return executeSubInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::Mul: |
| return executeMulInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::SDiv: |
| return executeSDivInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::UDiv: |
| return executeUDivInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::FDiv: |
| return executeFDivInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::URem: |
| return executeURemInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::SRem: |
| return executeSRemInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::FRem: |
| return executeFRemInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::And: |
| return executeAndInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::Or: |
| return executeOrInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::Xor: |
| return executeXorInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| 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::Shl: |
| return executeShlInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::LShr: |
| return executeLShrInst(getOperandValue(CE->getOperand(0), SF), |
| getOperandValue(CE->getOperand(1), SF), |
| CE->getOperand(0)->getType()); |
| case Instruction::AShr: |
| return executeAShrInst(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: |
| cerr << "Unhandled ConstantExpr: " << *CE << "\n"; |
| abort(); |
| return GenericValue(); |
| } |
| } |
| |
| 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]; |
| } |
| } |
| |
| 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 |
| |
| static GenericValue executeAddInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_BINARY_OPERATOR(+, Int8); |
| IMPLEMENT_BINARY_OPERATOR(+, Int16); |
| IMPLEMENT_BINARY_OPERATOR(+, Int32); |
| IMPLEMENT_BINARY_OPERATOR(+, Int64); |
| IMPLEMENT_BINARY_OPERATOR(+, Float); |
| IMPLEMENT_BINARY_OPERATOR(+, Double); |
| default: |
| cerr << "Unhandled type for Add instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeSubInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_BINARY_OPERATOR(-, Int8); |
| IMPLEMENT_BINARY_OPERATOR(-, Int16); |
| IMPLEMENT_BINARY_OPERATOR(-, Int32); |
| IMPLEMENT_BINARY_OPERATOR(-, Int64); |
| IMPLEMENT_BINARY_OPERATOR(-, Float); |
| IMPLEMENT_BINARY_OPERATOR(-, Double); |
| default: |
| cerr << "Unhandled type for Sub instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeMulInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_BINARY_OPERATOR(*, Int8); |
| IMPLEMENT_BINARY_OPERATOR(*, Int16); |
| IMPLEMENT_BINARY_OPERATOR(*, Int32); |
| IMPLEMENT_BINARY_OPERATOR(*, Int64); |
| IMPLEMENT_BINARY_OPERATOR(*, Float); |
| IMPLEMENT_BINARY_OPERATOR(*, Double); |
| default: |
| cerr << "Unhandled type for Mul instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| #define IMPLEMENT_SIGNLESS_BINOP(OP, TY, CAST) \ |
| case Type::TY##TyID: Dest.TY##Val = \ |
| ((CAST)Src1.TY##Val) OP ((CAST)Src2.TY##Val); break |
| |
| static GenericValue executeUDivInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_SIGNLESS_BINOP(/, Int8, uint8_t); |
| IMPLEMENT_SIGNLESS_BINOP(/, Int16, uint16_t); |
| IMPLEMENT_SIGNLESS_BINOP(/, Int32, uint32_t); |
| IMPLEMENT_SIGNLESS_BINOP(/, Int64, uint64_t); |
| default: |
| cerr << "Unhandled type for UDiv instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeSDivInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_SIGNLESS_BINOP(/, Int8, int8_t); |
| IMPLEMENT_SIGNLESS_BINOP(/, Int16, int16_t); |
| IMPLEMENT_SIGNLESS_BINOP(/, Int32, int32_t); |
| IMPLEMENT_SIGNLESS_BINOP(/, Int64, int64_t); |
| default: |
| cerr << "Unhandled type for SDiv instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeFDivInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_BINARY_OPERATOR(/, Float); |
| IMPLEMENT_BINARY_OPERATOR(/, Double); |
| default: |
| cerr << "Unhandled type for Div instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeURemInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_SIGNLESS_BINOP(%, Int8, uint8_t); |
| IMPLEMENT_SIGNLESS_BINOP(%, Int16, uint16_t); |
| IMPLEMENT_SIGNLESS_BINOP(%, Int32, uint32_t); |
| IMPLEMENT_SIGNLESS_BINOP(%, Int64, uint64_t ); |
| default: |
| cerr << "Unhandled type for URem instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeSRemInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_SIGNLESS_BINOP(%, Int8, int8_t); |
| IMPLEMENT_SIGNLESS_BINOP(%, Int16, int16_t); |
| IMPLEMENT_SIGNLESS_BINOP(%, Int32, int32_t); |
| IMPLEMENT_SIGNLESS_BINOP(%, Int64, int64_t); |
| default: |
| cerr << "Unhandled type for Rem instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeFRemInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| 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(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeAndInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_BINARY_OPERATOR(&, Bool); |
| IMPLEMENT_BINARY_OPERATOR(&, Int8); |
| IMPLEMENT_BINARY_OPERATOR(&, Int16); |
| IMPLEMENT_BINARY_OPERATOR(&, Int32); |
| IMPLEMENT_BINARY_OPERATOR(&, Int64); |
| default: |
| cerr << "Unhandled type for And instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeOrInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_BINARY_OPERATOR(|, Bool); |
| IMPLEMENT_BINARY_OPERATOR(|, Int8); |
| IMPLEMENT_BINARY_OPERATOR(|, Int16); |
| IMPLEMENT_BINARY_OPERATOR(|, Int32); |
| IMPLEMENT_BINARY_OPERATOR(|, Int64); |
| default: |
| cerr << "Unhandled type for Or instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeXorInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_BINARY_OPERATOR(^, Bool); |
| IMPLEMENT_BINARY_OPERATOR(^, Int8); |
| IMPLEMENT_BINARY_OPERATOR(^, Int16); |
| IMPLEMENT_BINARY_OPERATOR(^, Int32); |
| IMPLEMENT_BINARY_OPERATOR(^, Int64); |
| default: |
| cerr << "Unhandled type for Xor instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| #define IMPLEMENT_ICMP(OP, TY, CAST) \ |
| case Type::TY##TyID: Dest.BoolVal = \ |
| ((CAST)Src1.TY##Val) OP ((CAST)Src2.TY##Val); 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_POINTERCMP(OP) \ |
| case Type::PointerTyID: \ |
| Dest.BoolVal = (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_ICMP(==, Int8, uint8_t); |
| IMPLEMENT_ICMP(==, Int16, uint16_t); |
| IMPLEMENT_ICMP(==, Int32, uint32_t); |
| IMPLEMENT_ICMP(==, Int64, uint64_t); |
| IMPLEMENT_POINTERCMP(==); |
| 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_ICMP(!=, Int8, uint8_t); |
| IMPLEMENT_ICMP(!=, Int16, uint16_t); |
| IMPLEMENT_ICMP(!=, Int32, uint32_t); |
| IMPLEMENT_ICMP(!=, Int64, uint64_t); |
| IMPLEMENT_POINTERCMP(!=); |
| 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_ICMP(<, Int8, uint8_t); |
| IMPLEMENT_ICMP(<, Int16, uint16_t); |
| IMPLEMENT_ICMP(<, Int32, uint32_t); |
| IMPLEMENT_ICMP(<, Int64, uint64_t); |
| IMPLEMENT_POINTERCMP(<); |
| 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_ICMP(<, Int8, int8_t); |
| IMPLEMENT_ICMP(<, Int16, int16_t); |
| IMPLEMENT_ICMP(<, Int32, int32_t); |
| IMPLEMENT_ICMP(<, Int64, int64_t); |
| IMPLEMENT_POINTERCMP(<); |
| 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_ICMP(>, Int8, uint8_t); |
| IMPLEMENT_ICMP(>, Int16, uint16_t); |
| IMPLEMENT_ICMP(>, Int32, uint32_t); |
| IMPLEMENT_ICMP(>, Int64, uint64_t); |
| IMPLEMENT_POINTERCMP(>); |
| 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_ICMP(>, Int8, int8_t); |
| IMPLEMENT_ICMP(>, Int16, int16_t); |
| IMPLEMENT_ICMP(>, Int32, int32_t); |
| IMPLEMENT_ICMP(>, Int64, int64_t); |
| IMPLEMENT_POINTERCMP(>); |
| 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_ICMP(<=, Int8, uint8_t); |
| IMPLEMENT_ICMP(<=, Int16, uint16_t); |
| IMPLEMENT_ICMP(<=, Int32, uint32_t); |
| IMPLEMENT_ICMP(<=, Int64, uint64_t); |
| IMPLEMENT_POINTERCMP(<=); |
| 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_ICMP(<=, Int8, int8_t); |
| IMPLEMENT_ICMP(<=, Int16, int16_t); |
| IMPLEMENT_ICMP(<=, Int32, int32_t); |
| IMPLEMENT_ICMP(<=, Int64, int64_t); |
| IMPLEMENT_POINTERCMP(<=); |
| 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_ICMP(>=, Int8, uint8_t); |
| IMPLEMENT_ICMP(>=, Int16, uint16_t); |
| IMPLEMENT_ICMP(>=, Int32, uint32_t); |
| IMPLEMENT_ICMP(>=, Int64, uint64_t); |
| IMPLEMENT_POINTERCMP(>=); |
| 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_ICMP(>=, Int8, int8_t); |
| IMPLEMENT_ICMP(>=, Int16, int16_t); |
| IMPLEMENT_ICMP(>=, Int32, int32_t); |
| IMPLEMENT_ICMP(>=, Int64, int64_t); |
| IMPLEMENT_POINTERCMP(>=); |
| 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.BoolVal = Src1.TY##Val OP Src2.TY##Val; break |
| |
| static GenericValue executeFCMP_EQ(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_FCMP(==, Float); |
| IMPLEMENT_FCMP(==, Double); |
| default: |
| cerr << "Unhandled type for SetEQ instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeFCMP_NE(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_FCMP(!=, Float); |
| IMPLEMENT_FCMP(!=, Double); |
| |
| default: |
| cerr << "Unhandled type for SetNE instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeFCMP_LE(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_FCMP(<=, Float); |
| IMPLEMENT_FCMP(<=, Double); |
| default: |
| cerr << "Unhandled type for SetLE instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeFCMP_GE(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_FCMP(>=, Float); |
| IMPLEMENT_FCMP(>=, Double); |
| default: |
| cerr << "Unhandled type for SetGE instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeFCMP_LT(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_FCMP(<, Float); |
| IMPLEMENT_FCMP(<, Double); |
| default: |
| cerr << "Unhandled type for SetLT instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeFCMP_GT(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_FCMP(>, Float); |
| IMPLEMENT_FCMP(>, Double); |
| default: |
| cerr << "Unhandled type for SetGT instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| 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.BoolVal = false; |
| case FCmpInst::FCMP_ORD: R = executeFCMP_EQ(Src1, Src2, Ty); break; ///??? |
| case FCmpInst::FCMP_UNO: R = executeFCMP_NE(Src1, Src2, Ty); break; ///??? |
| case FCmpInst::FCMP_OEQ: |
| case FCmpInst::FCMP_UEQ: R = executeFCMP_EQ(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_ONE: |
| case FCmpInst::FCMP_UNE: R = executeFCMP_NE(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_OLT: |
| case FCmpInst::FCMP_ULT: R = executeFCMP_LT(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_OGT: |
| case FCmpInst::FCMP_UGT: R = executeFCMP_GT(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_OLE: |
| case FCmpInst::FCMP_ULE: R = executeFCMP_LE(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_OGE: |
| case FCmpInst::FCMP_UGE: R = executeFCMP_GE(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_TRUE: R.BoolVal = true; |
| 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_EQ(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_UNO: return executeFCMP_NE(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_OEQ: |
| case FCmpInst::FCMP_UEQ: return executeFCMP_EQ(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_ONE: |
| case FCmpInst::FCMP_UNE: return executeFCMP_NE(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_OLT: |
| case FCmpInst::FCMP_ULT: return executeFCMP_LT(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_OGT: |
| case FCmpInst::FCMP_UGT: return executeFCMP_GT(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_OLE: |
| case FCmpInst::FCMP_ULE: return executeFCMP_LE(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_OGE: |
| case FCmpInst::FCMP_UGE: return executeFCMP_GE(Src1, Src2, Ty); break; |
| case FCmpInst::FCMP_FALSE: { |
| GenericValue Result; |
| Result.BoolVal = false; |
| return Result; |
| } |
| case FCmpInst::FCMP_TRUE: { |
| GenericValue Result; |
| Result.BoolVal = 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: R = executeAddInst (Src1, Src2, Ty); break; |
| case Instruction::Sub: R = executeSubInst (Src1, Src2, Ty); break; |
| case Instruction::Mul: R = executeMulInst (Src1, Src2, Ty); break; |
| case Instruction::UDiv: R = executeUDivInst (Src1, Src2, Ty); break; |
| case Instruction::SDiv: R = executeSDivInst (Src1, Src2, Ty); break; |
| case Instruction::FDiv: R = executeFDivInst (Src1, Src2, Ty); break; |
| case Instruction::URem: R = executeURemInst (Src1, Src2, Ty); break; |
| case Instruction::SRem: R = executeSRemInst (Src1, Src2, Ty); break; |
| case Instruction::FRem: R = executeFRemInst (Src1, Src2, Ty); break; |
| case Instruction::And: R = executeAndInst (Src1, Src2, Ty); break; |
| case Instruction::Or: R = executeOrInst (Src1, Src2, Ty); break; |
| case Instruction::Xor: R = executeXorInst (Src1, Src2, Ty); 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.BoolVal ? Src2 : Src3; |
| } |
| |
| 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.Int32Val); |
| } |
| |
| /// 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->isIntegral()) { // Nonvoid return type? |
| ExitValue = Result; // Capture the exit value of the program |
| } else { |
| memset(&ExitValue, 0, sizeof(ExitValue)); |
| } |
| } 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).BoolVal == 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).BoolVal) { |
| 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).Int32Val; |
| |
| // Allocate enough memory to hold the type... |
| void *Memory = malloc(NumElements * (size_t)TD.getTypeSize(Ty)); |
| |
| 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!"); |
| |
| PointerTy 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 += (PointerTy)SLO->MemberOffsets[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); |
| |
| uint64_t Idx; |
| switch (I.getOperand()->getType()->getTypeID()) { |
| default: assert(0 && "Illegal getelementptr index for sequential type!"); |
| case Type::Int8TyID: Idx = IdxGV.Int8Val; break; |
| case Type::Int16TyID: Idx = IdxGV.Int16Val; break; |
| case Type::Int32TyID: Idx = IdxGV.Int32Val; break; |
| case Type::Int64TyID: Idx = IdxGV.Int64Val; break; |
| } |
| Total += PointerTy(TD.getTypeSize(ST->getElementType())*Idx); |
| } |
| } |
| |
| GenericValue Result; |
| Result.PointerVal = getOperandValue(Ptr, SF).PointerVal + Total; |
| 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(Ptr, I.getType()); |
| SetValue(&I, Result, SF); |
| } |
| |
| void Interpreter::visitStoreInst(StoreInst &I) { |
| ExecutionContext &SF = ECStack.back(); |
| GenericValue Val = getOperandValue(I.getOperand(0), SF); |
| GenericValue SRC = getOperandValue(I.getPointerOperand(), SF); |
| StoreValueToMemory(Val, (GenericValue *)GVTOP(SRC), |
| I.getOperand(0)->getType()); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Miscellaneous Instruction Implementations |
| //===----------------------------------------------------------------------===// |
| |
| void Interpreter::visitCallSite(CallSite CS) { |
| ExecutionContext &SF = ECStack.back(); |
| |
| // Check to see if this is an intrinsic function call... |
| if (Function *F = CS.getCalledFunction()) |
| if (F->isExternal ()) |
| 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. |
| // |
| Instruction *Prev = CS.getInstruction()->getPrev(); |
| BasicBlock *Parent = CS.getInstruction()->getParent(); |
| IL->LowerIntrinsicCall(cast<CallInst>(CS.getInstruction())); |
| |
| // Restore the CurInst pointer to the first instruction newly inserted, if |
| // any. |
| if (!Prev) { |
| SF.CurInst = Parent->begin(); |
| } else { |
| SF.CurInst = Prev; |
| ++SF.CurInst; |
| } |
| return; |
| } |
| |
| SF.Caller = CS; |
| std::vector<GenericValue> ArgVals; |
| const unsigned NumArgs = SF.Caller.arg_size(); |
| ArgVals.reserve(NumArgs); |
| for (CallSite::arg_iterator i = SF.Caller.arg_begin(), |
| e = SF.Caller.arg_end(); i != e; ++i) { |
| Value *V = *i; |
| ArgVals.push_back(getOperandValue(V, SF)); |
| // Promote all integral types whose size is < sizeof(int) into ints. We do |
| // this by zero or sign extending the value as appropriate according to the |
| // source type. |
| const Type *Ty = V->getType(); |
| if (Ty->isIntegral() && Ty->getPrimitiveSize() < 4) { |
| if (Ty == Type::Int16Ty) |
| ArgVals.back().Int32Val = ArgVals.back().Int16Val; |
| else if (Ty == Type::Int8Ty) |
| ArgVals.back().Int32Val = ArgVals.back().Int8Val; |
| else if (Ty == Type::BoolTy) |
| ArgVals.back().Int32Val = ArgVals.back().BoolVal; |
| else |
| assert(0 && "Unknown type!"); |
| } |
| } |
| |
| // 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); |
| } |
| |
| #define IMPLEMENT_SHIFT(OP, TY) \ |
| case Type::TY##TyID: Dest.TY##Val = Src1.TY##Val OP Src2.Int8Val; break |
| |
| #define IMPLEMENT_SIGNLESS_SHIFT(OP, TY, CAST) \ |
| case Type::TY##TyID: Dest.TY##Val = ((CAST)Src1.TY##Val) OP Src2.Int8Val; \ |
| break |
| |
| static GenericValue executeShlInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_SHIFT(<<, Int8); |
| IMPLEMENT_SHIFT(<<, Int16); |
| IMPLEMENT_SHIFT(<<, Int32); |
| IMPLEMENT_SHIFT(<<, Int64); |
| default: |
| cerr << "Unhandled type for Shl instruction: " << *Ty << "\n"; |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeLShrInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_SIGNLESS_SHIFT(>>, Int8, uint8_t); |
| IMPLEMENT_SIGNLESS_SHIFT(>>, Int16, uint16_t); |
| IMPLEMENT_SIGNLESS_SHIFT(>>, Int32, uint32_t); |
| IMPLEMENT_SIGNLESS_SHIFT(>>, Int64, uint64_t); |
| default: |
| cerr << "Unhandled type for LShr instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| static GenericValue executeAShrInst(GenericValue Src1, GenericValue Src2, |
| const Type *Ty) { |
| GenericValue Dest; |
| switch (Ty->getTypeID()) { |
| IMPLEMENT_SIGNLESS_SHIFT(>>, Int8, int8_t); |
| IMPLEMENT_SIGNLESS_SHIFT(>>, Int16, int16_t); |
| IMPLEMENT_SIGNLESS_SHIFT(>>, Int32, int32_t); |
| IMPLEMENT_SIGNLESS_SHIFT(>>, Int64, int64_t); |
| default: |
| cerr << "Unhandled type for AShr instruction: " << *Ty << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| void Interpreter::visitShl(ShiftInst &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 Dest; |
| Dest = executeShlInst (Src1, Src2, Ty); |
| SetValue(&I, Dest, SF); |
| } |
| |
| void Interpreter::visitLShr(ShiftInst &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 Dest; |
| Dest = executeLShrInst (Src1, Src2, Ty); |
| SetValue(&I, Dest, SF); |
| } |
| |
| void Interpreter::visitAShr(ShiftInst &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 Dest; |
| Dest = executeAShrInst (Src1, Src2, Ty); |
| SetValue(&I, Dest, SF); |
| } |
| |
| #define IMPLEMENT_CAST_START \ |
| switch (DstTy->getTypeID()) { |
| |
| #define IMPLEMENT_CAST(STY, DTY, CAST) \ |
| case Type::STY##TyID: Dest.DTY##Val = (CAST(Src.STY##Val)); break; |
| |
| #define IMPLEMENT_CAST_CASE(DTY, CAST) \ |
| case Type::DTY##TyID: \ |
| switch (SrcTy->getTypeID()) { \ |
| IMPLEMENT_CAST(Bool, DTY, CAST); \ |
| IMPLEMENT_CAST(Int8, DTY, CAST); \ |
| IMPLEMENT_CAST(Int16, DTY, CAST); \ |
| IMPLEMENT_CAST(Int32, DTY, CAST); \ |
| IMPLEMENT_CAST(Int64, DTY, CAST); \ |
| IMPLEMENT_CAST(Pointer,DTY, CAST); \ |
| IMPLEMENT_CAST(Float, DTY, CAST); \ |
| IMPLEMENT_CAST(Double, DTY, CAST); \ |
| default: \ |
| cerr << "Unhandled cast: " \ |
| << *SrcTy << " to " << *DstTy << "\n"; \ |
| abort(); \ |
| } \ |
| break |
| |
| #define IMPLEMENT_CAST_END \ |
| default: cerr \ |
| << "Unhandled dest type for cast instruction: " \ |
| << *DstTy << "\n"; \ |
| abort(); \ |
| } |
| |
| GenericValue Interpreter::executeCastOperation(Instruction::CastOps opcode, |
| Value *SrcVal, const Type *DstTy, |
| ExecutionContext &SF) { |
| const Type *SrcTy = SrcVal->getType(); |
| GenericValue Dest, Src = getOperandValue(SrcVal, SF); |
| |
| if (opcode == Instruction::Trunc && DstTy->getTypeID() == Type::BoolTyID) { |
| // For truncations to bool, we must clear the high order bits of the source |
| switch (SrcTy->getTypeID()) { |
| case Type::BoolTyID: Src.BoolVal &= 1; break; |
| case Type::Int8TyID: Src.Int8Val &= 1; break; |
| case Type::Int16TyID: Src.Int16Val &= 1; break; |
| case Type::Int32TyID: Src.Int32Val &= 1; break; |
| case Type::Int64TyID: Src.Int64Val &= 1; break; |
| default: |
| assert(0 && "Can't trunc a non-integer!"); |
| break; |
| } |
| } else if (opcode == Instruction::SExt && |
| SrcTy->getTypeID() == Type::BoolTyID) { |
| // For sign extension from bool, we must extend the source bits. |
| SrcTy = Type::Int64Ty; |
| Src.Int64Val = 0 - Src.BoolVal; |
| } |
| |
| switch (opcode) { |
| case Instruction::Trunc: // src integer, dest integral (can't be long) |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Bool , (bool)); |
| IMPLEMENT_CAST_CASE(Int8 , (uint8_t)); |
| IMPLEMENT_CAST_CASE(Int16, (uint16_t)); |
| IMPLEMENT_CAST_CASE(Int32, (uint32_t)); |
| IMPLEMENT_CAST_CASE(Int64, (uint64_t)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::ZExt: // src integral (can't be long), dest integer |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Int8 , (uint8_t)); |
| IMPLEMENT_CAST_CASE(Int16, (uint16_t)); |
| IMPLEMENT_CAST_CASE(Int32, (uint32_t)); |
| IMPLEMENT_CAST_CASE(Int64, (uint64_t)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::SExt: // src integral (can't be long), dest integer |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Int8 , (uint8_t)(int8_t)); |
| IMPLEMENT_CAST_CASE(Int16, (uint16_t)(int16_t)); |
| IMPLEMENT_CAST_CASE(Int32, (uint32_t)(int32_t)); |
| IMPLEMENT_CAST_CASE(Int64, (uint64_t)(int64_t)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::FPTrunc: // src double, dest float |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Float , (float)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::FPExt: // src float, dest double |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Double , (double)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::UIToFP: // src integral, dest floating |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Float , (float)(uint64_t)); |
| IMPLEMENT_CAST_CASE(Double , (double)(uint64_t)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::SIToFP: // src integeral, dest floating |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Float , (float)(int64_t)); |
| IMPLEMENT_CAST_CASE(Double , (double)(int64_t)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::FPToUI: // src floating, dest integral |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Bool , (bool)); |
| IMPLEMENT_CAST_CASE(Int8 , (uint8_t)); |
| IMPLEMENT_CAST_CASE(Int16, (uint16_t)); |
| IMPLEMENT_CAST_CASE(Int32, (uint32_t )); |
| IMPLEMENT_CAST_CASE(Int64, (uint64_t)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::FPToSI: // src floating, dest integral |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Bool , (bool)); |
| IMPLEMENT_CAST_CASE(Int8 , (uint8_t) (int8_t)); |
| IMPLEMENT_CAST_CASE(Int16, (uint16_t)(int16_t)); |
| IMPLEMENT_CAST_CASE(Int32, (uint32_t)(int32_t)); |
| IMPLEMENT_CAST_CASE(Int64, (uint64_t)(int64_t)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::PtrToInt: // src pointer, dest integral |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Bool , (bool)); |
| IMPLEMENT_CAST_CASE(Int8 , (uint8_t)); |
| IMPLEMENT_CAST_CASE(Int16, (uint16_t)); |
| IMPLEMENT_CAST_CASE(Int32, (uint32_t)); |
| IMPLEMENT_CAST_CASE(Int64, (uint64_t)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::IntToPtr: // src integral, dest pointer |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Pointer, (PointerTy)); |
| IMPLEMENT_CAST_END |
| break; |
| case Instruction::BitCast: // src any, dest any (same size) |
| IMPLEMENT_CAST_START |
| IMPLEMENT_CAST_CASE(Bool , (bool)); |
| IMPLEMENT_CAST_CASE(Int8 , (uint8_t)); |
| IMPLEMENT_CAST_CASE(Int16 , (uint16_t)); |
| IMPLEMENT_CAST_CASE(Int32 , (uint32_t)); |
| IMPLEMENT_CAST_CASE(Int64 , (uint64_t)); |
| IMPLEMENT_CAST_CASE(Pointer, (PointerTy)); |
| IMPLEMENT_CAST_CASE(Float , (float)); |
| IMPLEMENT_CAST_CASE(Double , (double)); |
| IMPLEMENT_CAST_END |
| break; |
| default: |
| cerr << "Invalid cast opcode for cast instruction: " << opcode << "\n"; |
| abort(); |
| } |
| return Dest; |
| } |
| |
| void Interpreter::visitCastInst(CastInst &I) { |
| ExecutionContext &SF = ECStack.back(); |
| SetValue(&I, executeCastOperation(I.getOpcode(), 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()) { |
| IMPLEMENT_VAARG(Int8); |
| IMPLEMENT_VAARG(Int16); |
| IMPLEMENT_VAARG(Int32); |
| IMPLEMENT_VAARG(Int64); |
| IMPLEMENT_VAARG(Pointer); |
| IMPLEMENT_VAARG(Float); |
| IMPLEMENT_VAARG(Double); |
| IMPLEMENT_VAARG(Bool); |
| 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; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // 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->isExternal()) { |
| 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... |
| } |
| } |