X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FVMCore%2FInstruction.cpp;h=05bed4c64316fa77e406ec96153c6ccd0c700bd0;hb=990bdd50d17f8a05c14392cc402a7e098fd2505f;hp=e1dead99f23fc7260f91608057688b2867601096;hpb=ddb6db4fa11d06217d01d8431596131abdfb7ef0;p=oota-llvm.git diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp index e1dead99f23..05bed4c6431 100644 --- a/lib/VMCore/Instruction.cpp +++ b/lib/VMCore/Instruction.cpp @@ -2,8 +2,8 @@ // // 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 is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // @@ -11,16 +11,18 @@ // //===----------------------------------------------------------------------===// -#include "llvm/Instructions.h" -#include "llvm/Function.h" -#include "llvm/SymbolTable.h" +#include "llvm/Instruction.h" #include "llvm/Type.h" +#include "llvm/Instructions.h" +#include "llvm/Constants.h" +#include "llvm/Module.h" +#include "llvm/Support/CallSite.h" #include "llvm/Support/LeakDetector.h" using namespace llvm; Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps, - const std::string &Name, Instruction *InsertBefore) - : User(ty, Value::InstructionVal + it, Ops, NumOps, Name), Parent(0) { + Instruction *InsertBefore) + : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) { // Make sure that we get added to a basicblock LeakDetector::addGarbageObject(this); @@ -33,8 +35,8 @@ Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps, } Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps, - const std::string &Name, BasicBlock *InsertAtEnd) - : User(ty, Value::InstructionVal + it, Ops, NumOps, Name), Parent(0) { + BasicBlock *InsertAtEnd) + : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) { // Make sure that we get added to a basicblock LeakDetector::addGarbageObject(this); @@ -43,10 +45,15 @@ Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps, InsertAtEnd->getInstList().push_back(this); } -void Instruction::setOpcode(unsigned opc) { - setValueType(Value::InstructionVal + opc); + +// Out of line virtual method, so the vtable, etc has a home. +Instruction::~Instruction() { + assert(Parent == 0 && "Instruction still linked in the program!"); + if (hasMetadataHashEntry()) + clearMetadataHashEntries(); } + void Instruction::setParent(BasicBlock *P) { if (getParent()) { if (!P) LeakDetector::addGarbageObject(this); @@ -65,53 +72,92 @@ void Instruction::eraseFromParent() { getParent()->getInstList().erase(this); } +/// insertBefore - Insert an unlinked instructions into a basic block +/// immediately before the specified instruction. +void Instruction::insertBefore(Instruction *InsertPos) { + InsertPos->getParent()->getInstList().insert(InsertPos, this); +} + +/// insertAfter - Insert an unlinked instructions into a basic block +/// immediately after the specified instruction. +void Instruction::insertAfter(Instruction *InsertPos) { + InsertPos->getParent()->getInstList().insertAfter(InsertPos, this); +} + +/// moveBefore - Unlink this instruction from its current basic block and +/// insert it into the basic block that MovePos lives in, right before +/// MovePos. +void Instruction::moveBefore(Instruction *MovePos) { + MovePos->getParent()->getInstList().splice(MovePos,getParent()->getInstList(), + this); +} + + const char *Instruction::getOpcodeName(unsigned OpCode) { switch (OpCode) { // Terminators case Ret: return "ret"; case Br: return "br"; case Switch: return "switch"; + case IndirectBr: return "indirectbr"; case Invoke: return "invoke"; case Unwind: return "unwind"; case Unreachable: return "unreachable"; // Standard binary operators... case Add: return "add"; + case FAdd: return "fadd"; case Sub: return "sub"; + case FSub: return "fsub"; case Mul: return "mul"; - case Div: return "div"; - case Rem: return "rem"; + case FMul: return "fmul"; + case UDiv: return "udiv"; + case SDiv: return "sdiv"; + case FDiv: return "fdiv"; + case URem: return "urem"; + case SRem: return "srem"; + case FRem: return "frem"; // Logical operators... case And: return "and"; case Or : return "or"; case Xor: return "xor"; - // SetCC operators... - case SetLE: return "setle"; - case SetGE: return "setge"; - case SetLT: return "setlt"; - case SetGT: return "setgt"; - case SetEQ: return "seteq"; - case SetNE: return "setne"; - // Memory instructions... - case Malloc: return "malloc"; - case Free: return "free"; case Alloca: return "alloca"; case Load: return "load"; case Store: return "store"; case GetElementPtr: return "getelementptr"; + // Convert instructions... + case Trunc: return "trunc"; + case ZExt: return "zext"; + case SExt: return "sext"; + case FPTrunc: return "fptrunc"; + case FPExt: return "fpext"; + case FPToUI: return "fptoui"; + case FPToSI: return "fptosi"; + case UIToFP: return "uitofp"; + case SIToFP: return "sitofp"; + case IntToPtr: return "inttoptr"; + case PtrToInt: return "ptrtoint"; + case BitCast: return "bitcast"; + // Other instructions... - case PHI: return "phi"; - case Cast: return "cast"; - case Select: return "select"; - case Call: return "call"; - case Shl: return "shl"; - case Shr: return "shr"; - case VANext: return "vanext"; - case VAArg: return "vaarg"; + case ICmp: return "icmp"; + case FCmp: return "fcmp"; + case PHI: return "phi"; + case Select: return "select"; + case Call: return "call"; + case Shl: return "shl"; + case LShr: return "lshr"; + case AShr: return "ashr"; + case VAArg: return "va_arg"; + case ExtractElement: return "extractelement"; + case InsertElement: return "insertelement"; + case ShuffleVector: return "shufflevector"; + case ExtractValue: return "extractvalue"; + case InsertValue: return "insertvalue"; default: return " "; } @@ -122,7 +168,15 @@ const char *Instruction::getOpcodeName(unsigned OpCode) { /// isIdenticalTo - Return true if the specified instruction is exactly /// identical to the current one. This means that all operands match and any /// extra information (e.g. load is volatile) agree. -bool Instruction::isIdenticalTo(Instruction *I) const { +bool Instruction::isIdenticalTo(const Instruction *I) const { + return isIdenticalToWhenDefined(I) && + SubclassOptionalData == I->SubclassOptionalData; +} + +/// isIdenticalToWhenDefined - This is like isIdenticalTo, except that it +/// ignores the SubclassOptionalData flags, which specify conditions +/// under which the instruction's result is undefined. +bool Instruction::isIdenticalToWhenDefined(const Instruction *I) const { if (getOpcode() != I->getOpcode() || getNumOperands() != I->getNumOperands() || getType() != I->getType()) @@ -136,31 +190,167 @@ bool Instruction::isIdenticalTo(Instruction *I) const { // Check special state that is a part of some instructions. if (const LoadInst *LI = dyn_cast(this)) - return LI->isVolatile() == cast(I)->isVolatile(); + return LI->isVolatile() == cast(I)->isVolatile() && + LI->getAlignment() == cast(I)->getAlignment(); + if (const StoreInst *SI = dyn_cast(this)) + return SI->isVolatile() == cast(I)->isVolatile() && + SI->getAlignment() == cast(I)->getAlignment(); + if (const CmpInst *CI = dyn_cast(this)) + return CI->getPredicate() == cast(I)->getPredicate(); + if (const CallInst *CI = dyn_cast(this)) + return CI->isTailCall() == cast(I)->isTailCall() && + CI->getCallingConv() == cast(I)->getCallingConv() && + CI->getAttributes().getRawPointer() == + cast(I)->getAttributes().getRawPointer(); + if (const InvokeInst *CI = dyn_cast(this)) + return CI->getCallingConv() == cast(I)->getCallingConv() && + CI->getAttributes().getRawPointer() == + cast(I)->getAttributes().getRawPointer(); + if (const InsertValueInst *IVI = dyn_cast(this)) { + if (IVI->getNumIndices() != cast(I)->getNumIndices()) + return false; + for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i) + if (IVI->idx_begin()[i] != cast(I)->idx_begin()[i]) + return false; + return true; + } + if (const ExtractValueInst *EVI = dyn_cast(this)) { + if (EVI->getNumIndices() != cast(I)->getNumIndices()) + return false; + for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i) + if (EVI->idx_begin()[i] != cast(I)->idx_begin()[i]) + return false; + return true; + } + + return true; +} + +// isSameOperationAs +// This should be kept in sync with isEquivalentOperation in +// lib/Transforms/IPO/MergeFunctions.cpp. +bool Instruction::isSameOperationAs(const Instruction *I) const { + if (getOpcode() != I->getOpcode() || + getNumOperands() != I->getNumOperands() || + getType() != I->getType()) + return false; + + // We have two instructions of identical opcode and #operands. Check to see + // if all operands are the same type + for (unsigned i = 0, e = getNumOperands(); i != e; ++i) + if (getOperand(i)->getType() != I->getOperand(i)->getType()) + return false; + + // Check special state that is a part of some instructions. + if (const LoadInst *LI = dyn_cast(this)) + return LI->isVolatile() == cast(I)->isVolatile() && + LI->getAlignment() == cast(I)->getAlignment(); if (const StoreInst *SI = dyn_cast(this)) - return SI->isVolatile() == cast(I)->isVolatile(); - if (const VANextInst *VAN = dyn_cast(this)) - return VAN->getArgType() == cast(I)->getArgType(); + return SI->isVolatile() == cast(I)->isVolatile() && + SI->getAlignment() == cast(I)->getAlignment(); + if (const CmpInst *CI = dyn_cast(this)) + return CI->getPredicate() == cast(I)->getPredicate(); if (const CallInst *CI = dyn_cast(this)) - return CI->isTailCall() == cast(I)->isTailCall(); + return CI->isTailCall() == cast(I)->isTailCall() && + CI->getCallingConv() == cast(I)->getCallingConv() && + CI->getAttributes().getRawPointer() == + cast(I)->getAttributes().getRawPointer(); + if (const InvokeInst *CI = dyn_cast(this)) + return CI->getCallingConv() == cast(I)->getCallingConv() && + CI->getAttributes().getRawPointer() == + cast(I)->getAttributes().getRawPointer(); + if (const InsertValueInst *IVI = dyn_cast(this)) { + if (IVI->getNumIndices() != cast(I)->getNumIndices()) + return false; + for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i) + if (IVI->idx_begin()[i] != cast(I)->idx_begin()[i]) + return false; + return true; + } + if (const ExtractValueInst *EVI = dyn_cast(this)) { + if (EVI->getNumIndices() != cast(I)->getNumIndices()) + return false; + for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i) + if (EVI->idx_begin()[i] != cast(I)->idx_begin()[i]) + return false; + return true; + } + return true; } +/// isUsedOutsideOfBlock - Return true if there are any uses of I outside of the +/// specified block. Note that PHI nodes are considered to evaluate their +/// operands in the corresponding predecessor block. +bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const { + for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) { + // PHI nodes uses values in the corresponding predecessor block. For other + // instructions, just check to see whether the parent of the use matches up. + const User *U = *UI; + const PHINode *PN = dyn_cast(U); + if (PN == 0) { + if (cast(U)->getParent() != BB) + return true; + continue; + } + + if (PN->getIncomingBlock(UI) != BB) + return true; + } + return false; +} + +/// mayReadFromMemory - Return true if this instruction may read memory. +/// +bool Instruction::mayReadFromMemory() const { + switch (getOpcode()) { + default: return false; + case Instruction::VAArg: + case Instruction::Load: + return true; + case Instruction::Call: + return !cast(this)->doesNotAccessMemory(); + case Instruction::Invoke: + return !cast(this)->doesNotAccessMemory(); + case Instruction::Store: + return cast(this)->isVolatile(); + } +} + +/// mayWriteToMemory - Return true if this instruction may modify memory. +/// +bool Instruction::mayWriteToMemory() const { + switch (getOpcode()) { + default: return false; + case Instruction::Store: + case Instruction::VAArg: + return true; + case Instruction::Call: + return !cast(this)->onlyReadsMemory(); + case Instruction::Invoke: + return !cast(this)->onlyReadsMemory(); + case Instruction::Load: + return cast(this)->isVolatile(); + } +} + +/// mayThrow - Return true if this instruction may throw an exception. +/// +bool Instruction::mayThrow() const { + if (const CallInst *CI = dyn_cast(this)) + return !CI->doesNotThrow(); + return false; +} /// isAssociative - Return true if the instruction is associative: /// -/// Associative operators satisfy: x op (y op z) === (x op y) op z) +/// Associative operators satisfy: x op (y op z) === (x op y) op z /// -/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative, when not -/// applied to floating point types. +/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative. /// bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) { - if (Opcode == Add || Opcode == Mul || - Opcode == And || Opcode == Or || Opcode == Xor) { - // Floating point operations do not associate! - return !Ty->isFloatingPoint(); - } - return 0; + return Opcode == And || Opcode == Or || Opcode == Xor || + Opcode == Add || Opcode == Mul; } /// isCommutative - Return true if the instruction is commutative: @@ -173,47 +363,92 @@ bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) { bool Instruction::isCommutative(unsigned op) { switch (op) { case Add: + case FAdd: case Mul: + case FMul: case And: case Or: case Xor: - case SetEQ: - case SetNE: return true; default: return false; } } -/// isRelational - Return true if the instruction is a Set* instruction: -/// -bool Instruction::isRelational(unsigned op) { - switch (op) { - case SetEQ: - case SetNE: - case SetLT: - case SetGT: - case SetLE: - case SetGE: +bool Instruction::isSafeToSpeculativelyExecute() const { + for (unsigned i = 0, e = getNumOperands(); i != e; ++i) + if (Constant *C = dyn_cast(getOperand(i))) + if (C->canTrap()) + return false; + + switch (getOpcode()) { + default: return true; + case UDiv: + case URem: { + // x / y is undefined if y == 0, but calcuations like x / 3 are safe. + ConstantInt *Op = dyn_cast(getOperand(1)); + return Op && !Op->isNullValue(); + } + case SDiv: + case SRem: { + // x / y is undefined if y == 0, and might be undefined if y == -1, + // but calcuations like x / 3 are safe. + ConstantInt *Op = dyn_cast(getOperand(1)); + return Op && !Op->isNullValue() && !Op->isAllOnesValue(); + } + case Load: { + if (cast(this)->isVolatile()) + return false; + // Note that it is not safe to speculate into a malloc'd region because + // malloc may return null. + // It's also not safe to follow a bitcast, for example: + // bitcast i8* (alloca i8) to i32* + // would result in a 4-byte load from a 1-byte alloca. + Value *Op0 = getOperand(0); + if (GEPOperator *GEP = dyn_cast(Op0)) { + // TODO: it's safe to do this for any GEP with constant indices that + // compute inside the allocated type, but not for any inbounds gep. + if (GEP->hasAllZeroIndices()) + Op0 = GEP->getPointerOperand(); + } + if (isa(Op0)) + return true; + if (GlobalVariable *GV = dyn_cast(getOperand(0))) + return !GV->hasExternalWeakLinkage(); + return false; } - return false; -} - - - -/// isTrappingInstruction - Return true if the instruction may trap. -/// -bool Instruction::isTrapping(unsigned op) { - switch(op) { - case Div: - case Rem: - case Load: - case Store: case Call: + return false; // The called function could have undefined behavior or + // side-effects. + // FIXME: We should special-case some intrinsics (bswap, + // overflow-checking arithmetic, etc.) + case VAArg: + case Alloca: case Invoke: - return true; - default: - return false; + case PHI: + case Store: + case Ret: + case Br: + case IndirectBr: + case Switch: + case Unwind: + case Unreachable: + return false; // Misc instructions which have effects } } + +Instruction *Instruction::clone() const { + Instruction *New = clone_impl(); + New->SubclassOptionalData = SubclassOptionalData; + if (!hasMetadata()) + return New; + + // Otherwise, enumerate and copy over metadata from the old instruction to the + // new one. + SmallVector, 4> TheMDs; + getAllMetadata(TheMDs); + for (unsigned i = 0, e = TheMDs.size(); i != e; ++i) + New->setMetadata(TheMDs[i].first, TheMDs[i].second); + return New; +}