X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FValue.h;h=7e7b415ffdeed671b1ba2ec26cf13a283633a236;hb=295643b8050d4c45b06032690d707e7281e82c92;hp=58a4c8cbac61863ead687322190678ce92def74d;hpb=ed455c8fa25dd37a13b33f0afa66be03ac49b5bb;p=oota-llvm.git diff --git a/include/llvm/Value.h b/include/llvm/Value.h index 58a4c8cbac6..7e7b415ffde 100644 --- a/include/llvm/Value.h +++ b/include/llvm/Value.h @@ -2,13 +2,12 @@ // // 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 declares the Value class. -// This file also defines the Use<> template for users of value. // //===----------------------------------------------------------------------===// @@ -18,7 +17,7 @@ #include "llvm/AbstractTypeUser.h" #include "llvm/Use.h" #include "llvm/Support/Casting.h" -#include "llvm/Support/Streams.h" +#include #include namespace llvm { @@ -35,7 +34,12 @@ class InlineAsm; class ValueSymbolTable; class TypeSymbolTable; template class StringMapEntry; +template +class AssertingVH; typedef StringMapEntry ValueName; +class raw_ostream; +class AssemblyAnnotationWriter; +class ValueHandleBase; //===----------------------------------------------------------------------===// // Value Class @@ -46,31 +50,39 @@ typedef StringMapEntry ValueName; /// the super class of other important classes such as Instruction and Function. /// All Values have a Type. Type is not a subclass of Value. All types can have /// a name and they should belong to some Module. Setting the name on the Value -/// automatically update's the module's symbol table. +/// automatically updates the module's symbol table. /// /// Every value has a "use list" that keeps track of which other Values are -/// using this Value. +/// using this Value. A Value can also have an arbitrary number of ValueHandle +/// objects that watch it and listen to RAUW and Destroy events see +/// llvm/Support/ValueHandle.h for details. +/// /// @brief LLVM Value Representation class Value { - const unsigned short SubclassID; // Subclass identifier (for isa/dyn_cast) + const unsigned char SubclassID; // Subclass identifier (for isa/dyn_cast) + unsigned char HasValueHandle : 1; // Has a ValueHandle pointing to this? protected: + /// SubclassOptionalData - This member is similar to SubclassData, however it + /// is for holding information which may be used to aid optimization, but + /// which may be cleared to zero without affecting conservative + /// interpretation. + unsigned char SubclassOptionalData : 7; + /// SubclassData - This member is defined by this class, but is not used for /// anything. Subclasses can use it to hold whatever state they find useful. /// This field is initialized to zero by the ctor. unsigned short SubclassData; private: - PATypeHolder Ty; + PATypeHolder VTy; Use *UseList; friend class ValueSymbolTable; // Allow ValueSymbolTable to directly mod Name. friend class SymbolTable; // Allow SymbolTable to directly poke Name. + friend class ValueHandleBase; ValueName *Name; -private: void operator=(const Value &); // Do not implement Value(const Value &); // Do not implement -protected: - static void destroyThis(Value*); public: Value(const Type *Ty, unsigned scid); @@ -80,14 +92,14 @@ public: // virtual void dump() const; - /// print - Implement operator<< on Value... + /// print - Implement operator<< on Value. /// - virtual void print(std::ostream &O) const = 0; - void print(std::ostream *O) const { if (O) print(*O); } + void print(std::ostream &O, AssemblyAnnotationWriter *AAW = 0) const; + void print(raw_ostream &O, AssemblyAnnotationWriter *AAW = 0) const; /// All values are typed, get the type of this value. /// - inline const Type *getType() const { return Ty; } + inline const Type *getType() const { return VTy; } // All values can potentially be named... inline bool hasName() const { return Name != 0; } @@ -97,6 +109,12 @@ public: /// 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 *getNameStart() const; + /// getNameEnd - Return a pointer to the end of the name. + const char *getNameEnd() const { return getNameStart() + getNameLen(); } + + /// isName - Return true if this value has the name specified by the provided + /// nul terminated string. + bool isName(const char *N) const; /// getNameLen - Return the length of the string, correctly handling nul /// characters embedded into them. @@ -128,8 +146,14 @@ public: // Only use when in type resolution situations! void uncheckedReplaceAllUsesWith(Value *V); + /// clearOptionalData - Clear any optional optimization data from this Value. + /// Transformation passes must call this method whenever changing the IR + /// in a way that would affect the values produced by this Value, unless + /// it takes special care to ensure correctness in some other way. + void clearOptionalData() { SubclassOptionalData = 0; } + //---------------------------------------------------------------------- - // Methods for handling the vector of uses of this Value. + // Methods for handling the chain of uses of this Value. // typedef value_use_iterator use_iterator; typedef value_use_iterator use_const_iterator; @@ -140,7 +164,7 @@ public: use_iterator use_end() { return use_iterator(0); } use_const_iterator use_end() const { return use_const_iterator(0); } User *use_back() { return *use_begin(); } - const User *use_back() const { return *use_begin(); } + const User *use_back() const { return *use_begin(); } /// hasOneUse - Return true if there is exactly one user of this value. This /// is specialized because it is a common request and does not require @@ -161,12 +185,14 @@ public: /// bool hasNUsesOrMore(unsigned N) const; + bool isUsedInBasicBlock(const BasicBlock *BB) const; + /// getNumUses - This method computes the number of uses of this Value. This /// is a linear time operation. Use hasOneUse, hasNUses, or hasMoreThanNUses /// to check for specific values. unsigned getNumUses() const; - /// addUse/killUse - These two methods should only be used by the Use class. + /// addUse - This method should only be used by the Use class. /// void addUse(Use &U) { U.addToList(&UseList); } @@ -189,12 +215,15 @@ public: ConstantStructVal, // This is an instance of ConstantStruct ConstantVectorVal, // This is an instance of ConstantVector ConstantPointerNullVal, // This is an instance of ConstantPointerNull + MDStringVal, // This is an instance of MDString + MDNodeVal, // This is an instance of MDNode InlineAsmVal, // This is an instance of InlineAsm + PseudoSourceValueVal, // This is an instance of PseudoSourceValue InstructionVal, // This is an instance of Instruction // Markers: ConstantFirstVal = FunctionVal, - ConstantLastVal = ConstantPointerNullVal + ConstantLastVal = MDNodeVal }; /// getValueID - Return an ID for the concrete type of this object. This is @@ -217,24 +246,46 @@ public: /// getRawType - This should only be used to implement the vmcore library. /// - const Type *getRawType() const { return Ty.getRawType(); } + const Type *getRawType() const { return VTy.getRawType(); } + + /// stripPointerCasts - This method strips off any unneeded pointer + /// casts from the specified value, returning the original uncasted value. + /// Note that the returned value has pointer type if the specified value does. + Value *stripPointerCasts(); + const Value *stripPointerCasts() const { + return const_cast(this)->stripPointerCasts(); + } + + /// getUnderlyingObject - This method strips off any GEP address adjustments + /// and pointer casts from the specified value, returning the original object + /// being addressed. Note that the returned value has pointer type if the + /// specified value does. + Value *getUnderlyingObject(); + const Value *getUnderlyingObject() const { + return const_cast(this)->getUnderlyingObject(); + } + + /// DoPHITranslation - If this value is a PHI node with CurBB as its parent, + /// return the value in the PHI node corresponding to PredBB. If not, return + /// ourself. This is useful if you want to know the value something has in a + /// predecessor block. + Value *DoPHITranslation(const BasicBlock *CurBB, const BasicBlock *PredBB); + + const Value *DoPHITranslation(const BasicBlock *CurBB, + const BasicBlock *PredBB) const{ + return const_cast(this)->DoPHITranslation(CurBB, PredBB); + } }; inline std::ostream &operator<<(std::ostream &OS, const Value &V) { V.print(OS); return OS; } - -void Use::init(Value *v, User *user) { - Val = v; - U = user; - if (Val) Val->addUse(*this); -} - -Use::~Use() { - if (Val) removeFromList(); +inline raw_ostream &operator<<(raw_ostream &OS, const Value &V) { + V.print(OS); + return OS; } - + void Use::set(Value *V) { if (Val) removeFromList(); Val = V; @@ -271,8 +322,22 @@ template <> inline bool isa_impl(const Value &Val) { return Val.getValueID() == Value::GlobalAliasVal; } template <> inline bool isa_impl(const Value &Val) { - return isa(Val) || isa(Val) || isa(Val); + return isa(Val) || isa(Val) || + isa(Val); } + + +// Value* is only 4-byte aligned. +template<> +class PointerLikeTypeTraits { + typedef Value* PT; +public: + static inline void *getAsVoidPointer(PT P) { return P; } + static inline PT getFromVoidPointer(void *P) { + return static_cast(P); + } + enum { NumLowBitsAvailable = 2 }; +}; } // End llvm namespace