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- Add new Constant::replaceUsesOfWithOnConstant which has an end result
similar to User::replaceUsesOfWith but actually does the right thing for constants. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4102 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -16,10 +16,11 @@ protected:
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void destroyConstantImpl();
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public:
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/// setName - Specialize setName to handle symbol table majik...
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// setName - Specialize setName to handle symbol table majik...
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virtual void setName(const std::string &name, SymbolTable *ST = 0);
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/// Static constructor to get a '0' constant of arbitrary type...
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///
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static Constant *getNullValue(const Type *Ty);
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/// isNullValue - Return true if this is the value that would be returned by
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@@ -29,6 +30,7 @@ public:
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virtual void print(std::ostream &O) const;
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/// isConstantExpr - Return true if this is a ConstantExpr
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///
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virtual bool isConstantExpr() const { return false; }
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@@ -49,12 +51,31 @@ public:
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virtual void destroyConstant() { assert(0 && "Not reached!"); }
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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//// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const Constant *) { return true; }
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static inline bool classof(const Value *V) {
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return V->getValueType() == Value::ConstantVal;
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}
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/// replaceUsesOfWithOnConstant - This method is a special form of
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/// User::replaceUsesOfWith (which does not work on constants) that does work
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/// on constants. Basically this method goes through the trouble of building
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/// a new constant that is equivalent to the current one, with all uses of
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/// From replaced with uses of To. After this construction is completed, all
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/// of the users of 'this' are replaced to use the new constant, and then
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/// 'this' is deleted. In general, you should not call this method, instead,
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/// use Value::replaceAllUsesWith, which automatically dispatches to this
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/// method as needed.
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///
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virtual void replaceUsesOfWithOnConstant(Value *From, Value *To) {
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// Provide a default implementation for constants (like integers) that
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// cannot use any other values. This cannot be called at runtime, but needs
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// to be here to avoid link errors.
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assert(getNumOperands() == 0 && "replaceUsesOfWithOnConstant must be "
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"implemented for all constants that have operands!");
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assert(0 && "Constants that do not have operands cannot be using 'From'!");
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}
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// WARNING: Only to be used by Bytecode & Assembly Parsers! USER CODE SHOULD
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// NOT USE THIS!!
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// Returns the number of uses of OldV that were replaced.
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