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Also, change MDString to use a StringRef. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77098 91177308-0d34-0410-b5e6-96231b3b80d8
164 lines
4.9 KiB
C++
164 lines
4.9 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/ErrorHandling.h"
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#include "llvm/Support/ValueHandle.h"
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namespace llvm {
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//===----------------------------------------------------------------------===//
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// MetadataBase - A base class for MDNode and MDString.
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class MetadataBase : public Value {
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protected:
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MetadataBase(const Type *Ty, unsigned scid)
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: Value(Ty, scid) {}
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public:
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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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/// 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 || V->getValueID() == MDNodeVal;
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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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///
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class MDString : public MetadataBase {
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MDString(const MDString &); // DO NOT IMPLEMENT
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StringRef Str;
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friend class LLVMContextImpl;
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protected:
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explicit MDString(const char *begin, unsigned l)
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: MetadataBase(Type::MetadataTy, Value::MDStringVal), Str(begin, l) {}
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public:
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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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///
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class MDNode : public MetadataBase, public FoldingSetNode {
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MDNode(const MDNode &); // DO NOT IMPLEMENT
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friend class LLVMContextImpl;
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void replaceElement(Value *From, Value *To);
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SmallVector<WeakVH, 4> Node;
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typedef SmallVectorImpl<WeakVH>::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<WeakVH>::const_iterator const_elem_iterator;
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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 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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} // end llvm namespace
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#endif
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