X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FVMCore%2FValue.cpp;h=0976a7459915ad8c4822fcb995e65594b0e4e50e;hb=d3745476dee3a1b86929717e17db2e1ce00bda39;hp=cdde96b455b7765372e12199e39dc2f312095ce0;hpb=0d1e40728d668085257b78657b381e1f13d77d52;p=oota-llvm.git diff --git a/lib/VMCore/Value.cpp b/lib/VMCore/Value.cpp index cdde96b455b..0976a745991 100644 --- a/lib/VMCore/Value.cpp +++ b/lib/VMCore/Value.cpp @@ -1,24 +1,26 @@ //===-- Value.cpp - Implement the Value class -----------------------------===// -// +// // 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. +// //===----------------------------------------------------------------------===// // -// This file implements the Value and User classes. +// This file implements the Value and User classes. // //===----------------------------------------------------------------------===// #include "llvm/Constant.h" +#include "llvm/Constants.h" #include "llvm/DerivedTypes.h" #include "llvm/InstrTypes.h" +#include "llvm/Instructions.h" #include "llvm/Module.h" -#include "llvm/SymbolTable.h" +#include "llvm/ValueSymbolTable.h" +#include "llvm/Support/Debug.h" #include "llvm/Support/LeakDetector.h" #include -#include using namespace llvm; //===----------------------------------------------------------------------===// @@ -30,15 +32,17 @@ static inline const Type *checkType(const Type *Ty) { return Ty; } -Value::Value(const Type *ty, unsigned scid, const std::string &name) - : SubclassID(scid), SubclassData(0), Ty(checkType(ty)), - UseList(0), Name(name) { - if (!isa(this) && !isa(this)) - assert((Ty->isFirstClassType() || Ty == Type::VoidTy || +Value::Value(const Type *ty, unsigned scid) + : SubclassID(scid), SubclassData(0), VTy(checkType(ty)), + UseList(0), Name(0) { + if (isa(this) || isa(this)) + assert((VTy->isFirstClassType() || VTy == Type::VoidTy || + isa(ty) || VTy->getTypeID() == Type::StructTyID) && + "invalid CallInst type!"); + else if (!isa(this) && !isa(this)) + assert((VTy->isFirstClassType() || VTy == Type::VoidTy || isa(ty)) && "Cannot create non-first-class values except for constants!"); - if (ty == Type::VoidTy) - assert(name.empty() && "Cannot have named void values!"); } Value::~Value() { @@ -46,18 +50,23 @@ Value::~Value() { // Check to make sure that there are no uses of this value that are still // around when the value is destroyed. If there are, then we have a dangling // reference and something is wrong. This code is here to print out what is - // still being referenced. The value in question should be printed as + // still being referenced. The value in question should be printed as // a // - if (use_begin() != use_end()) { - std::cerr << "While deleting: " << *Ty << " %" << Name << "\n"; + if (!use_empty()) { + DOUT << "While deleting: " << *VTy << " %" << getNameStr() << "\n"; for (use_iterator I = use_begin(), E = use_end(); I != E; ++I) - std::cerr << "Use still stuck around after Def is destroyed:" - << **I << "\n"; + DOUT << "Use still stuck around after Def is destroyed:" + << **I << "\n"; } #endif - assert(use_begin() == use_end() && "Uses remain when a value is destroyed!"); + assert(use_empty() && "Uses remain when a value is destroyed!"); + // If this value is named, destroy the name. This should not be in a symtab + // at this point. + if (Name) + Name->Destroy(); + // There should be no uses of this object anymore, remove it. LeakDetector::removeGarbageObject(this); } @@ -84,6 +93,17 @@ bool Value::hasNUsesOrMore(unsigned N) const { return true; } +/// isUsedInBasicBlock - Return true if this value is used in the specified +/// basic block. +bool Value::isUsedInBasicBlock(const BasicBlock *BB) const { + for (use_const_iterator I = use_begin(), E = use_end(); I != E; ++I) { + const Instruction *User = dyn_cast(*I); + if (User && User->getParent() == BB) + return true; + } + return false; +} + /// getNumUses - This method computes the number of uses of this Value. This /// is a linear time operation. Use hasOneUse or hasNUses to check for specific @@ -92,32 +112,184 @@ unsigned Value::getNumUses() const { return (unsigned)std::distance(use_begin(), use_end()); } +static bool getSymTab(Value *V, ValueSymbolTable *&ST) { + ST = 0; + if (Instruction *I = dyn_cast(V)) { + if (BasicBlock *P = I->getParent()) + if (Function *PP = P->getParent()) + ST = &PP->getValueSymbolTable(); + } else if (BasicBlock *BB = dyn_cast(V)) { + if (Function *P = BB->getParent()) + ST = &P->getValueSymbolTable(); + } else if (GlobalValue *GV = dyn_cast(V)) { + if (Module *P = GV->getParent()) + ST = &P->getValueSymbolTable(); + } else if (Argument *A = dyn_cast(V)) { + if (Function *P = A->getParent()) + ST = &P->getValueSymbolTable(); + } else { + assert(isa(V) && "Unknown value type!"); + return true; // no name is setable for this. + } + return false; +} + +/// getNameStart - Return a pointer to a null terminated string for this name. +/// Note that names can have null characters within the string as well as at +/// their end. This always returns a non-null pointer. +const char *Value::getNameStart() const { + if (Name == 0) return ""; + return Name->getKeyData(); +} + +/// getNameLen - Return the length of the string, correctly handling nul +/// characters embedded into them. +unsigned Value::getNameLen() const { + return Name ? Name->getKeyLength() : 0; +} + +/// isName - Return true if this value has the name specified by the provided +/// nul terminated string. +bool Value::isName(const char *N) const { + unsigned InLen = strlen(N); + return InLen == getNameLen() && memcmp(getNameStart(), N, InLen) == 0; +} + + +std::string Value::getNameStr() const { + if (Name == 0) return ""; + return std::string(Name->getKeyData(), + Name->getKeyData()+Name->getKeyLength()); +} void Value::setName(const std::string &name) { - if (Name == name) return; // Name is already set. + setName(&name[0], name.size()); +} - SymbolTable *ST = 0; +void Value::setName(const char *Name) { + setName(Name, Name ? strlen(Name) : 0); +} - if (Instruction *I = dyn_cast(this)) { - if (BasicBlock *P = I->getParent()) - if (Function *PP = P->getParent()) - ST = &PP->getSymbolTable(); - } else if (BasicBlock *BB = dyn_cast(this)) { - if (Function *P = BB->getParent()) ST = &P->getSymbolTable(); - } else if (GlobalValue *GV = dyn_cast(this)) { - if (Module *P = GV->getParent()) ST = &P->getSymbolTable(); - } else if (Argument *A = dyn_cast(this)) { - if (Function *P = A->getParent()) ST = &P->getSymbolTable(); - } else { - assert(isa(this) && "Unknown value type!"); - return; // no name is setable for this. +void Value::setName(const char *NameStr, unsigned NameLen) { + if (NameLen == 0 && !hasName()) return; + assert(getType() != Type::VoidTy && "Cannot assign a name to void values!"); + + // Get the symbol table to update for this object. + ValueSymbolTable *ST; + if (getSymTab(this, ST)) + return; // Cannot set a name on this value (e.g. constant). + + if (!ST) { // No symbol table to update? Just do the change. + if (NameLen == 0) { + // Free the name for this value. + Name->Destroy(); + Name = 0; + return; + } + + if (Name) { + // Name isn't changing? + if (NameLen == Name->getKeyLength() && + !memcmp(Name->getKeyData(), NameStr, NameLen)) + return; + Name->Destroy(); + } + + // NOTE: Could optimize for the case the name is shrinking to not deallocate + // then reallocated. + + // Create the new name. + Name = ValueName::Create(NameStr, NameStr+NameLen); + Name->setValue(this); + return; } + + // NOTE: Could optimize for the case the name is shrinking to not deallocate + // then reallocated. + if (hasName()) { + // Name isn't changing? + if (NameLen == Name->getKeyLength() && + !memcmp(Name->getKeyData(), NameStr, NameLen)) + return; - if (ST && hasName()) ST->remove(this); - Name = name; - if (ST && hasName()) ST->insert(this); + // Remove old name. + ST->removeValueName(Name); + Name->Destroy(); + Name = 0; + + if (NameLen == 0) + return; + } + + // Name is changing to something new. + Name = ST->createValueName(NameStr, NameLen, this); } + +/// takeName - transfer the name from V to this value, setting V's name to +/// empty. It is an error to call V->takeName(V). +void Value::takeName(Value *V) { + ValueSymbolTable *ST = 0; + // If this value has a name, drop it. + if (hasName()) { + // Get the symtab this is in. + if (getSymTab(this, ST)) { + // We can't set a name on this value, but we need to clear V's name if + // it has one. + if (V->hasName()) V->setName(0, 0); + return; // Cannot set a name on this value (e.g. constant). + } + + // Remove old name. + if (ST) + ST->removeValueName(Name); + Name->Destroy(); + Name = 0; + } + + // Now we know that this has no name. + + // If V has no name either, we're done. + if (!V->hasName()) return; + + // Get this's symtab if we didn't before. + if (!ST) { + if (getSymTab(this, ST)) { + // Clear V's name. + V->setName(0, 0); + return; // Cannot set a name on this value (e.g. constant). + } + } + + // Get V's ST, this should always succed, because V has a name. + ValueSymbolTable *VST; + bool Failure = getSymTab(V, VST); + assert(!Failure && "V has a name, so it should have a ST!"); Failure=Failure; + + // If these values are both in the same symtab, we can do this very fast. + // This works even if both values have no symtab yet. + if (ST == VST) { + // Take the name! + Name = V->Name; + V->Name = 0; + Name->setValue(this); + return; + } + + // Otherwise, things are slightly more complex. Remove V's name from VST and + // then reinsert it into ST. + + if (VST) + VST->removeValueName(V->Name); + Name = V->Name; + V->Name = 0; + Name->setValue(this); + + if (ST) + ST->reinsertValue(this); +} + + // uncheckedReplaceAllUsesWith - This is exactly the same as replaceAllUsesWith, // except that it doesn't have all of the asserts. The asserts fail because we // are half-way done resolving types, which causes some types to exist as two @@ -128,15 +300,15 @@ void Value::uncheckedReplaceAllUsesWith(Value *New) { while (!use_empty()) { Use &U = *UseList; // Must handle Constants specially, we cannot call replaceUsesOfWith on a - // constant! + // constant because they are uniqued. if (Constant *C = dyn_cast(U.getUser())) { - if (!isa(C)) - C->replaceUsesOfWithOnConstant(this, New, true); - else - U.set(New); - } else { - U.set(New); + if (!isa(C)) { + C->replaceUsesOfWithOnConstant(this, New, &U); + continue; + } } + + U.set(New); } } @@ -149,6 +321,43 @@ void Value::replaceAllUsesWith(Value *New) { uncheckedReplaceAllUsesWith(New); } +Value *Value::stripPointerCasts() { + if (!isa(getType())) + return this; + + if (ConstantExpr *CE = dyn_cast(this)) { + if (CE->getOpcode() == Instruction::BitCast) { + return CE->getOperand(0)->stripPointerCasts(); + } else if (CE->getOpcode() == Instruction::GetElementPtr) { + for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i) + if (!CE->getOperand(i)->isNullValue()) + return this; + return CE->getOperand(0)->stripPointerCasts(); + } + } else if (BitCastInst *CI = dyn_cast(this)) { + return CI->getOperand(0)->stripPointerCasts(); + } else if (GetElementPtrInst *GEP = dyn_cast(this)) { + if (GEP->hasAllZeroIndices()) + return GEP->getOperand(0)->stripPointerCasts(); + } + return this; +} + +Value *Value::getUnderlyingObject() { + if (!isa(getType())) + return this; + + if (Instruction *I = dyn_cast(this)) { + if (isa(I) || isa(I)) + return I->getOperand(0)->getUnderlyingObject(); + } else if (ConstantExpr *CE = dyn_cast(this)) { + if (CE->getOpcode() == Instruction::BitCast || + CE->getOpcode() == Instruction::GetElementPtr) + return CE->getOperand(0)->getUnderlyingObject(); + } + return this; +} + //===----------------------------------------------------------------------===// // User Class //===----------------------------------------------------------------------===// @@ -159,7 +368,7 @@ void Value::replaceAllUsesWith(Value *New) { void User::replaceUsesOfWith(Value *From, Value *To) { if (From == To) return; // Duh what? - assert(!isa(this) || isa(this) && + assert((!isa(this) || isa(this)) && "Cannot call User::replaceUsesofWith on a constant!"); for (unsigned i = 0, E = getNumOperands(); i != E; ++i) @@ -171,3 +380,21 @@ void User::replaceUsesOfWith(Value *From, Value *To) { } } +void *User::operator new(size_t s, unsigned Us) { + void *Storage = ::operator new(s + sizeof(Use) * Us); + Use *Start = static_cast(Storage); + Use *End = Start + Us; + User *Obj = reinterpret_cast(End); + Obj->OperandList = Start; + Obj->NumOperands = Us; + Use::initTags(Start, End); + return Obj; +} + +void User::operator delete(void *Usr) { + User *Start = static_cast(Usr); + Use *Storage = static_cast(Usr) - Start->NumOperands; + ::operator delete(Storage == Start->OperandList + ? Storage + : Usr); +}