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3889a2cb05
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6842 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
3.5 KiB
C++
87 lines
3.5 KiB
C++
//===-- llvm/Constant.h - Constant class definition --------------*- C++ -*--=//
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//
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// This file contains the declaration of the Constant class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CONSTANT_H
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#define LLVM_CONSTANT_H
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#include "llvm/User.h"
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class Constant : public User {
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protected:
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inline Constant(const Type *Ty) : User(Ty, Value::ConstantVal) {}
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~Constant() {}
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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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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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/// getNullValue.
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virtual bool isNullValue() const = 0;
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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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/// destroyConstant - Called if some element of this constant is no longer
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/// valid. At this point only other constants may be on the use_list for this
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/// constant. Any constants on our Use list must also be destroy'd. The
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/// implementation must be sure to remove the constant from the list of
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/// available cached constants. Implementations should call
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/// destroyConstantImpl as the last thing they do, to destroy all users and
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/// delete this.
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///
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/// Note that this call is only valid on non-primitive constants: You cannot
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/// destroy an integer constant for example. This API is used to delete
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/// constants that have ConstantPointerRef's embeded in them when the module
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/// is deleted, and it is used by GlobalDCE to remove ConstantPointerRefs that
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/// are unneeded, allowing globals to be DCE'd.
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///
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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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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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unsigned mutateReferences(Value* OldV, Value *NewV);
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// END WARNING!!
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};
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#endif
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