X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FIR%2FConstant.h;h=bb88905aa57a0490bbf4189d2d37b5acacf26b1b;hb=ef112d46b98642b59c657f1560f7e1c21b13a0da;hp=36a4538e86cbe80a65772f5c125a50d1e09ac851;hpb=0b8c9a80f20772c3793201ab5b251d3520b9cea3;p=oota-llvm.git diff --git a/include/llvm/IR/Constant.h b/include/llvm/IR/Constant.h index 36a4538e86c..bb88905aa57 100644 --- a/include/llvm/IR/Constant.h +++ b/include/llvm/IR/Constant.h @@ -11,8 +11,8 @@ // //===----------------------------------------------------------------------===// -#ifndef LLVM_CONSTANT_H -#define LLVM_CONSTANT_H +#ifndef LLVM_IR_CONSTANT_H +#define LLVM_IR_CONSTANT_H #include "llvm/IR/User.h" @@ -24,43 +24,54 @@ namespace llvm { /// This is an important base class in LLVM. It provides the common facilities /// of all constant values in an LLVM program. A constant is a value that is /// immutable at runtime. Functions are constants because their address is -/// immutable. Same with global variables. -/// +/// immutable. Same with global variables. +/// /// All constants share the capabilities provided in this class. All constants /// can have a null value. They can have an operand list. Constants can be /// simple (integer and floating point values), complex (arrays and structures), -/// or expression based (computations yielding a constant value composed of +/// or expression based (computations yielding a constant value composed of /// only certain operators and other constant values). -/// -/// Note that Constants are immutable (once created they never change) -/// and are fully shared by structural equivalence. This means that two -/// structurally equivalent constants will always have the same address. -/// Constants are created on demand as needed and never deleted: thus clients +/// +/// Note that Constants are immutable (once created they never change) +/// and are fully shared by structural equivalence. This means that two +/// structurally equivalent constants will always have the same address. +/// Constants are created on demand as needed and never deleted: thus clients /// don't have to worry about the lifetime of the objects. /// @brief LLVM Constant Representation class Constant : public User { - void operator=(const Constant &) LLVM_DELETED_FUNCTION; - Constant(const Constant &) LLVM_DELETED_FUNCTION; - virtual void anchor(); - + void operator=(const Constant &) = delete; + Constant(const Constant &) = delete; + void anchor() override; + protected: Constant(Type *ty, ValueTy vty, Use *Ops, unsigned NumOps) : User(ty, vty, Ops, NumOps) {} - void destroyConstantImpl(); public: /// isNullValue - Return true if this is the value that would be returned by /// getNullValue. bool isNullValue() const; + /// \brief Returns true if the value is one. + bool isOneValue() const; + /// isAllOnesValue - Return true if this is the value that would be returned by /// getAllOnesValue. bool isAllOnesValue() const; - /// isNegativeZeroValue - Return true if the value is what would be returned + /// isNegativeZeroValue - Return true if the value is what would be returned /// by getZeroValueForNegation. bool isNegativeZeroValue() const; + /// Return true if the value is negative zero or null value. + bool isZeroValue() const; + + /// \brief Return true if the value is not the smallest signed value. + bool isNotMinSignedValue() const; + + /// \brief Return true if the value is the smallest signed value. + bool isMinSignedValue() const; + /// canTrap - Return true if evaluation of this constant could trap. This is /// true for things like constant expressions that could divide by zero. bool canTrap() const; @@ -68,32 +79,20 @@ public: /// isThreadDependent - Return true if the value can vary between threads. bool isThreadDependent() const; + /// Return true if the value is dependent on a dllimport variable. + bool isDLLImportDependent() const; + /// isConstantUsed - Return true if the constant has users other than constant /// exprs and other dangling things. bool isConstantUsed() const; - - enum PossibleRelocationsTy { - NoRelocation = 0, - LocalRelocation = 1, - GlobalRelocations = 2 - }; - - /// getRelocationInfo - This method classifies the entry according to - /// whether or not it may generate a relocation entry. This must be - /// conservative, so if it might codegen to a relocatable entry, it should say - /// so. The return values are: - /// - /// NoRelocation: This constant pool entry is guaranteed to never have a - /// relocation applied to it (because it holds a simple constant like - /// '4'). - /// LocalRelocation: This entry has relocations, but the entries are - /// guaranteed to be resolvable by the static linker, so the dynamic - /// linker will never see them. - /// GlobalRelocations: This entry may have arbitrary relocations. + + /// This method classifies the entry according to whether or not it may + /// generate a relocation entry. This must be conservative, so if it might + /// codegen to a relocatable entry, it should say so. /// - /// FIXME: This really should not be in VMCore. - PossibleRelocationsTy getRelocationInfo() const; - + /// FIXME: This really should not be in IR. + bool needsRelocation() const; + /// getAggregateElement - For aggregates (struct/array/vector) return the /// constant that corresponds to the specified element if possible, or null if /// not. This can return null if the element index is a ConstantExpr, or if @@ -109,14 +108,14 @@ public: /// vector of constant integers, all equal, and the common value is returned. const APInt &getUniqueInteger() const; - /// destroyConstant - Called if some element of this constant is no longer - /// valid. At this point only other constants may be on the use_list for this + /// Called if some element of this constant is no longer valid. + /// At this point only other constants may be on the use_list for this /// constant. Any constants on our Use list must also be destroy'd. The /// implementation must be sure to remove the constant from the list of - /// available cached constants. Implementations should call - /// destroyConstantImpl as the last thing they do, to destroy all users and - /// delete this. - virtual void destroyConstant() { llvm_unreachable("Not reached!"); } + /// available cached constants. Implementations should implement + /// destroyConstantImpl to remove constants from any pools/maps they are + /// contained it. + void destroyConstant(); //// Methods for support type inquiry through isa, cast, and dyn_cast: static inline bool classof(const Value *V) { @@ -124,8 +123,8 @@ public: V->getValueID() <= ConstantLastVal; } - /// replaceUsesOfWithOnConstant - This method is a special form of - /// User::replaceUsesOfWith (which does not work on constants) that does work + /// This method is a special form of User::replaceUsesOfWith + /// (which does not work on constants) that does work /// on constants. Basically this method goes through the trouble of building /// a new constant that is equivalent to the current one, with all uses of /// From replaced with uses of To. After this construction is completed, all @@ -134,15 +133,7 @@ public: /// use Value::replaceAllUsesWith, which automatically dispatches to this /// method as needed. /// - virtual void replaceUsesOfWithOnConstant(Value *, Value *, Use *) { - // Provide a default implementation for constants (like integers) that - // cannot use any other values. This cannot be called at runtime, but needs - // to be here to avoid link errors. - assert(getNumOperands() == 0 && "replaceUsesOfWithOnConstant must be " - "implemented for all constants that have operands!"); - llvm_unreachable("Constants that do not have operands cannot be using " - "'From'!"); - } + void handleOperandChange(Value *, Value *, Use *); static Constant *getNullValue(Type* Ty); @@ -153,13 +144,21 @@ public: /// getIntegerValue - Return the value for an integer or pointer constant, /// or a vector thereof, with the given scalar value. - static Constant *getIntegerValue(Type* Ty, const APInt &V); - + static Constant *getIntegerValue(Type *Ty, const APInt &V); + /// removeDeadConstantUsers - If there are any dead constant users dangling /// off of this constant, remove them. This method is useful for clients /// that want to check to see if a global is unused, but don't want to deal /// with potentially dead constants hanging off of the globals. void removeDeadConstantUsers() const; + + Constant *stripPointerCasts() { + return cast(Value::stripPointerCasts()); + } + + const Constant *stripPointerCasts() const { + return const_cast(this)->stripPointerCasts(); + } }; } // End llvm namespace