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5f4ac848d9
Use CallbackVH, instead of WeakVH, to hold MDNode elements. Use FoldingSetNode to unique MDNodes in a context. Use CallbackVH hooks to update context's MDNodeSet appropriately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80868 91177308-0d34-0410-b5e6-96231b3b80d8
306 lines
10 KiB
C++
306 lines
10 KiB
C++
//===-- llvm/Metadata.h - Metadata 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 metadata subclasses.
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/// They represent the different flavors of metadata that live in LLVM.
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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/User.h"
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#include "llvm/Type.h"
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#include "llvm/OperandTraits.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/ADT/SmallPtrSet.h"
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#include "llvm/ADT/ilist_node.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ValueHandle.h"
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namespace llvm {
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class Constant;
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class LLVMContext;
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//===----------------------------------------------------------------------===//
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// MetadataBase - A base class for MDNode, MDString and NamedMDNode.
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class MetadataBase : public User {
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private:
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/// ReservedSpace - The number of operands actually allocated. NumOperands is
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/// the number actually in use.
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unsigned ReservedSpace;
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protected:
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MetadataBase(const Type *Ty, unsigned scid)
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: User(Ty, scid, NULL, 0), ReservedSpace(0) {}
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void resizeOperands(unsigned NumOps);
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public:
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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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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const MetadataBase *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueID() == MDStringVal || V->getValueID() == MDNodeVal
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|| V->getValueID() == NamedMDNodeVal;
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}
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};
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//===----------------------------------------------------------------------===//
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/// MDString - a single uniqued string.
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/// These are used to efficiently contain a byte sequence for metadata.
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/// MDString is always unnamd.
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class MDString : public MetadataBase {
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MDString(const MDString &); // DO NOT IMPLEMENT
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void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
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unsigned getNumOperands(); // DO NOT IMPLEMENT
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StringRef Str;
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protected:
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explicit MDString(LLVMContext &C, const char *begin, unsigned l)
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: MetadataBase(Type::getMetadataTy(C), Value::MDStringVal), Str(begin, l) {}
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public:
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// Do not allocate any space for operands.
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void *operator new(size_t s) {
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return User::operator new(s, 0);
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}
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static MDString *get(LLVMContext &Context, const StringRef &Str);
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StringRef getString() const { return Str; }
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unsigned length() const { return Str.size(); }
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/// begin() - Pointer to the first byte of the string.
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///
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const char *begin() const { return Str.begin(); }
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/// end() - Pointer to one byte past the end of the string.
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///
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const char *end() const { return Str.end(); }
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const MDString *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueID() == MDStringVal;
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}
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};
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//===----------------------------------------------------------------------===//
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/// MDNode - a tuple of other values.
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/// These contain a list of the values that represent the metadata.
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/// MDNode is always unnamed.
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class MDNode : public MetadataBase, public FoldingSetNode {
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MDNode(const MDNode &); // DO NOT IMPLEMENT
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void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
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// getNumOperands - Make this only available for private uses.
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unsigned getNumOperands() { return User::getNumOperands(); }
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friend class ElementVH;
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// Use CallbackVH to hold MDNOde elements.
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struct ElementVH : public CallbackVH {
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MDNode *Parent;
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ElementVH(Value *V, MDNode *P) : CallbackVH(V), Parent(P) {}
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~ElementVH() {}
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virtual void deleted() {
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Parent->replaceElement(this->operator Value*(), 0);
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}
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virtual void allUsesReplacedWith(Value *NV) {
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Parent->replaceElement(this->operator Value*(), NV);
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}
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};
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// Replace each instance of F from the element list of this node with T.
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void replaceElement(Value *F, Value *T);
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SmallVector<ElementVH, 4> Node;
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protected:
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explicit MDNode(LLVMContext &C, Value*const* Vals, unsigned NumVals);
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public:
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// Do not allocate any space for operands.
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void *operator new(size_t s) {
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return User::operator new(s, 0);
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}
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// Constructors and destructors.
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static MDNode *get(LLVMContext &Context,
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Value* const* Vals, unsigned NumVals);
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/// dropAllReferences - Remove all uses and clear node vector.
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void dropAllReferences();
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/// ~MDNode - Destroy MDNode.
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~MDNode();
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/// getElement - Return specified element.
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Value *getElement(unsigned i) const {
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assert (getNumElements() > i && "Invalid element number!");
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return Node[i];
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}
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/// getNumElements - Return number of MDNode elements.
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unsigned getNumElements() const {
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return Node.size();
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}
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// Element access
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typedef SmallVectorImpl<ElementVH>::const_iterator const_elem_iterator;
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typedef SmallVectorImpl<ElementVH>::iterator elem_iterator;
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/// elem_empty - Return true if MDNode is empty.
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bool elem_empty() const { return Node.empty(); }
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const_elem_iterator elem_begin() const { return Node.begin(); }
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const_elem_iterator elem_end() const { return Node.end(); }
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elem_iterator elem_begin() { return Node.begin(); }
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elem_iterator elem_end() { return Node.end(); }
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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 replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
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llvm_unreachable("This should never be called because MDNodes have no ops");
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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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//===----------------------------------------------------------------------===//
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/// WeakMetadataVH - a weak value handle for metadata.
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class WeakMetadataVH : public WeakVH {
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public:
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WeakMetadataVH() : WeakVH() {}
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WeakMetadataVH(MetadataBase *M) : WeakVH(M) {}
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WeakMetadataVH(const WeakMetadataVH &RHS) : WeakVH(RHS) {}
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operator Value*() const {
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llvm_unreachable("WeakMetadataVH only handles Metadata");
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}
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operator MetadataBase*() const {
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return dyn_cast_or_null<MetadataBase>(getValPtr());
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}
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};
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//===----------------------------------------------------------------------===//
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/// NamedMDNode - a tuple of other metadata.
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/// NamedMDNode is always named. All NamedMDNode element has a type of metadata.
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template<typename ValueSubClass, typename ItemParentClass>
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class SymbolTableListTraits;
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class NamedMDNode : public MetadataBase, public ilist_node<NamedMDNode> {
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friend class SymbolTableListTraits<NamedMDNode, Module>;
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friend class LLVMContextImpl;
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NamedMDNode(const NamedMDNode &); // DO NOT IMPLEMENT
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void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
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// getNumOperands - Make this only available for private uses.
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unsigned getNumOperands() { return User::getNumOperands(); }
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Module *Parent;
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SmallVector<WeakMetadataVH, 4> Node;
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typedef SmallVectorImpl<WeakMetadataVH>::iterator elem_iterator;
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protected:
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explicit NamedMDNode(LLVMContext &C, const Twine &N, MetadataBase*const* Vals,
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unsigned NumVals, Module *M = 0);
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public:
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// Do not allocate any space for operands.
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void *operator new(size_t s) {
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return User::operator new(s, 0);
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}
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static NamedMDNode *Create(LLVMContext &C, const Twine &N,
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MetadataBase*const*MDs,
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unsigned NumMDs, Module *M = 0) {
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return new NamedMDNode(C, N, MDs, NumMDs, M);
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}
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static NamedMDNode *Create(const NamedMDNode *NMD, Module *M = 0);
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/// eraseFromParent - Drop all references and remove the node from parent
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/// module.
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void eraseFromParent();
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/// dropAllReferences - Remove all uses and clear node vector.
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void dropAllReferences();
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/// ~NamedMDNode - Destroy NamedMDNode.
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~NamedMDNode();
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/// getParent - Get the module that holds this named metadata collection.
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inline Module *getParent() { return Parent; }
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inline const Module *getParent() const { return Parent; }
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void setParent(Module *M) { Parent = M; }
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/// getElement - Return specified element.
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MetadataBase *getElement(unsigned i) const {
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assert (getNumElements() > i && "Invalid element number!");
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return Node[i];
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}
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/// getNumElements - Return number of NamedMDNode elements.
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unsigned getNumElements() const {
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return Node.size();
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}
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/// addElement - Add metadata element.
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void addElement(MetadataBase *M) {
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resizeOperands(0);
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OperandList[NumOperands++] = M;
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Node.push_back(WeakMetadataVH(M));
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}
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typedef SmallVectorImpl<WeakMetadataVH>::const_iterator const_elem_iterator;
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bool elem_empty() const { return Node.empty(); }
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const_elem_iterator elem_begin() const { return Node.begin(); }
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const_elem_iterator elem_end() const { return Node.end(); }
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elem_iterator elem_begin() { return Node.begin(); }
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elem_iterator elem_end() { return Node.end(); }
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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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virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
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llvm_unreachable(
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"This should never be called because NamedMDNodes have no ops");
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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 NamedMDNode *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueID() == NamedMDNodeVal;
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}
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};
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} // end llvm namespace
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#endif
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