X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FValue.h;h=a38d8cb8d9846a895a210827b7ec217575453f37;hb=1c39965342453ce33a3b3f9a863c38fdb45fd6ef;hp=1e2a8f6fb68e5c375ccca7ae0586b31d84d10c81;hpb=9d6565a5b1fbc4286d6ee638d8f47a3171a9ed7e;p=oota-llvm.git diff --git a/include/llvm/Value.h b/include/llvm/Value.h index 1e2a8f6fb68..a38d8cb8d98 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 { @@ -30,11 +29,17 @@ class BasicBlock; class GlobalValue; class Function; class GlobalVariable; +class GlobalAlias; class InlineAsm; class ValueSymbolTable; class TypeSymbolTable; template class StringMapEntry; +template +class AssertingVH; typedef StringMapEntry ValueName; +class raw_ostream; +class AssemblyAnnotationWriter; +class ValueHandleBase; //===----------------------------------------------------------------------===// // Value Class @@ -45,24 +50,29 @@ 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: /// 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; void operator=(const Value &); // Do not implement @@ -76,20 +86,41 @@ 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; } - std::string getName() const; ValueName *getValueName() const { return Name; } + /// 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 *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. + unsigned getNameLen() const; + + /// getName()/getNameStr() - Return the name of the specified value, + /// *constructing a string* to hold it. Because these are guaranteed to + /// construct a string, they are very expensive and should be avoided. + std::string getName() const { return getNameStr(); } + std::string getNameStr() const; + + void setName(const std::string &name); void setName(const char *Name, unsigned NameLen); void setName(const char *Name); // Takes a null-terminated string. @@ -110,7 +141,7 @@ public: void uncheckedReplaceAllUsesWith(Value *V); //---------------------------------------------------------------------- - // 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; @@ -121,7 +152,7 @@ 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 @@ -142,12 +173,14 @@ 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); } @@ -159,6 +192,7 @@ public: ArgumentVal, // This is an instance of Argument BasicBlockVal, // This is an instance of BasicBlock FunctionVal, // This is an instance of Function + GlobalAliasVal, // This is an instance of GlobalAlias GlobalVariableVal, // This is an instance of GlobalVariable UndefValueVal, // This is an instance of UndefValue ConstantExprVal, // This is an instance of ConstantExpr @@ -167,24 +201,29 @@ public: ConstantFPVal, // This is an instance of ConstantFP ConstantArrayVal, // This is an instance of ConstantArray ConstantStructVal, // This is an instance of ConstantStruct - ConstantVectorVal, // This is an instance of ConstantPacked + 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 }; - /// getValueType - Return an ID for the concrete type of this object. This is + /// getValueID - Return an ID for the concrete type of this object. This is /// used to implement the classof checks. This should not be used for any /// other purpose, as the values may change as LLVM evolves. Also, note that - /// starting with the InstructionVal value, the value stored is actually the - /// Instruction opcode, so there are more than just these values possible here - /// (and Instruction must be last). - /// - unsigned getValueType() const { + /// for instructions, the Instruction's opcode is added to InstructionVal. So + /// this means three things: + /// # there is no value with code InstructionVal (no opcode==0). + /// # there are more possible values for the value type than in ValueTy enum. + /// # the InstructionVal enumerator must be the highest valued enumerator in + /// the ValueTy enum. + unsigned getValueID() const { return SubclassID; } @@ -195,24 +234,46 @@ 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; @@ -224,30 +285,47 @@ void Use::set(Value *V) { // the subtype header files to test to see if the value is a subclass... // template <> inline bool isa_impl(const Value &Val) { - return Val.getValueType() >= Value::ConstantFirstVal && - Val.getValueType() <= Value::ConstantLastVal; + return Val.getValueID() >= Value::ConstantFirstVal && + Val.getValueID() <= Value::ConstantLastVal; } template <> inline bool isa_impl(const Value &Val) { - return Val.getValueType() == Value::ArgumentVal; + return Val.getValueID() == Value::ArgumentVal; } template <> inline bool isa_impl(const Value &Val) { - return Val.getValueType() == Value::InlineAsmVal; + return Val.getValueID() == Value::InlineAsmVal; } template <> inline bool isa_impl(const Value &Val) { - return Val.getValueType() >= Value::InstructionVal; + return Val.getValueID() >= Value::InstructionVal; } template <> inline bool isa_impl(const Value &Val) { - return Val.getValueType() == Value::BasicBlockVal; + return Val.getValueID() == Value::BasicBlockVal; } template <> inline bool isa_impl(const Value &Val) { - return Val.getValueType() == Value::FunctionVal; + return Val.getValueID() == Value::FunctionVal; } template <> inline bool isa_impl(const Value &Val) { - return Val.getValueType() == Value::GlobalVariableVal; + return Val.getValueID() == Value::GlobalVariableVal; +} +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); + 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