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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72610 91177308-0d34-0410-b5e6-96231b3b80d8
136 lines
4.4 KiB
C++
136 lines
4.4 KiB
C++
//===-- llvm/Metadata.h - Constant class subclass definitions ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// @file
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/// This file contains the declarations for the subclasses of Constant,
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/// which represent the different flavors of constant values that live in LLVM.
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/// Note that Constants are immutable (once created they never change) and are
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/// fully shared by structural equivalence. This means that two structurally
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/// equivalent constants will always have the same address. Constant's are
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/// created on demand as needed and never deleted: thus clients don't have to
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/// worry about the lifetime of the objects.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MDNODE_H
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#define LLVM_MDNODE_H
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#include "llvm/Constant.h"
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#include "llvm/Type.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/ValueHandle.h"
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namespace llvm {
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//===----------------------------------------------------------------------===//
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/// MDNode - a tuple of other values.
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/// These contain a list of the Constants that represent the metadata. The
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/// operand list is always empty, query the element list instead.
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///
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/// This class will attempt to keep track of values as they are modified. When
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/// a value is replaced the element will be replaced with it, and when the
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/// value is deleted the element is set to a null pointer. In order to preserve
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/// structural equivalence while the elements mutate, the MDNode may call
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/// replaceAllUsesWith on itself. Because of this, users of MDNode must use a
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/// WeakVH or CallbackVH to hold the node pointer if there is a chance that one
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/// of the elements held by the node may change.
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///
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class MDNode : public Constant, public FoldingSetNode {
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MDNode(const MDNode &); // DO NOT IMPLEMENT
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friend class ElementVH;
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struct ElementVH : public CallbackVH {
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MDNode *OwningNode;
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ElementVH(Value *V, MDNode *Parent)
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: CallbackVH(V), OwningNode(Parent) {}
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~ElementVH() {}
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/// deleted - Set this entry in the MDNode to 'null'. This will reallocate
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/// the MDNode.
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virtual void deleted() {
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OwningNode->replaceElement(this->operator Value*(), 0);
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}
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/// allUsesReplacedWith - Modify the MDNode by replacing this entry with
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/// new_value. This will reallocate the MDNode.
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virtual void allUsesReplacedWith(Value *new_value) {
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OwningNode->replaceElement(this->operator Value*(), new_value);
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}
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};
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void replaceElement(Value *From, Value *To);
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SmallVector<ElementVH, 4> Node;
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typedef SmallVectorImpl<ElementVH>::iterator elem_iterator;
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protected:
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explicit MDNode(Value*const* Vals, unsigned NumVals);
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public:
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typedef SmallVectorImpl<ElementVH>::const_iterator const_elem_iterator;
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/// get() - Static factory methods - Return objects of the specified value.
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///
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static MDNode *get(Value*const* Vals, unsigned NumVals);
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Value *getElement(unsigned i) const {
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return Node[i];
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}
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unsigned getNumElements() const {
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return Node.size();
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}
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bool elem_empty() const {
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return Node.empty();
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}
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const_elem_iterator elem_begin() const {
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return Node.begin();
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}
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const_elem_iterator elem_end() const {
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return Node.end();
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}
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/// getType() specialization - Type is always MetadataTy.
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///
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inline const Type *getType() const {
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return Type::MetadataTy;
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}
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/// isNullValue - Return true if this is the value that would be returned by
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/// getNullValue. This always returns false because getNullValue will never
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/// produce metadata.
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virtual bool isNullValue() const {
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return false;
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}
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/// Profile - calculate a unique identifier for this MDNode to collapse
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/// duplicates
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void Profile(FoldingSetNodeID &ID) const;
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virtual void destroyConstant();
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virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
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assert(0 && "This should never be called because MDNodes have no ops");
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abort();
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}
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const MDNode *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueID() == MDNodeVal;
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}
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};
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} // end llvm namespace
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#endif
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