d39c594d39
http://llvm.org/svn/llvm-project/llvm/branches/release_28@114020 Approved by: rpaulo (mentor)
685 lines
25 KiB
C++
685 lines
25 KiB
C++
//===-- llvm/ADT/FoldingSet.h - Uniquing Hash Set ---------------*- 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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// This file defines a hash set that can be used to remove duplication of nodes
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// in a graph. This code was originally created by Chris Lattner for use with
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// SelectionDAGCSEMap, but was isolated to provide use across the llvm code set.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_FOLDINGSET_H
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#define LLVM_ADT_FOLDINGSET_H
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#include "llvm/System/DataTypes.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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namespace llvm {
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class APFloat;
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class APInt;
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class BumpPtrAllocator;
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/// This folding set used for two purposes:
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/// 1. Given information about a node we want to create, look up the unique
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/// instance of the node in the set. If the node already exists, return
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/// it, otherwise return the bucket it should be inserted into.
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/// 2. Given a node that has already been created, remove it from the set.
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///
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/// This class is implemented as a single-link chained hash table, where the
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/// "buckets" are actually the nodes themselves (the next pointer is in the
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/// node). The last node points back to the bucket to simplify node removal.
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///
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/// Any node that is to be included in the folding set must be a subclass of
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/// FoldingSetNode. The node class must also define a Profile method used to
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/// establish the unique bits of data for the node. The Profile method is
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/// passed a FoldingSetNodeID object which is used to gather the bits. Just
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/// call one of the Add* functions defined in the FoldingSetImpl::NodeID class.
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/// NOTE: That the folding set does not own the nodes and it is the
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/// responsibility of the user to dispose of the nodes.
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///
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/// Eg.
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/// class MyNode : public FoldingSetNode {
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/// private:
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/// std::string Name;
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/// unsigned Value;
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/// public:
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/// MyNode(const char *N, unsigned V) : Name(N), Value(V) {}
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/// ...
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/// void Profile(FoldingSetNodeID &ID) const {
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/// ID.AddString(Name);
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/// ID.AddInteger(Value);
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/// }
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/// ...
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/// };
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///
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/// To define the folding set itself use the FoldingSet template;
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///
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/// Eg.
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/// FoldingSet<MyNode> MyFoldingSet;
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///
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/// Four public methods are available to manipulate the folding set;
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///
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/// 1) If you have an existing node that you want add to the set but unsure
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/// that the node might already exist then call;
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///
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/// MyNode *M = MyFoldingSet.GetOrInsertNode(N);
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///
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/// If The result is equal to the input then the node has been inserted.
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/// Otherwise, the result is the node existing in the folding set, and the
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/// input can be discarded (use the result instead.)
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///
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/// 2) If you are ready to construct a node but want to check if it already
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/// exists, then call FindNodeOrInsertPos with a FoldingSetNodeID of the bits to
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/// check;
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///
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/// FoldingSetNodeID ID;
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/// ID.AddString(Name);
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/// ID.AddInteger(Value);
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/// void *InsertPoint;
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///
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/// MyNode *M = MyFoldingSet.FindNodeOrInsertPos(ID, InsertPoint);
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///
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/// If found then M with be non-NULL, else InsertPoint will point to where it
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/// should be inserted using InsertNode.
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///
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/// 3) If you get a NULL result from FindNodeOrInsertPos then you can as a new
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/// node with FindNodeOrInsertPos;
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///
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/// InsertNode(N, InsertPoint);
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///
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/// 4) Finally, if you want to remove a node from the folding set call;
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///
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/// bool WasRemoved = RemoveNode(N);
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///
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/// The result indicates whether the node existed in the folding set.
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class FoldingSetNodeID;
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//===----------------------------------------------------------------------===//
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/// FoldingSetImpl - Implements the folding set functionality. The main
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/// structure is an array of buckets. Each bucket is indexed by the hash of
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/// the nodes it contains. The bucket itself points to the nodes contained
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/// in the bucket via a singly linked list. The last node in the list points
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/// back to the bucket to facilitate node removal.
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///
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class FoldingSetImpl {
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protected:
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/// Buckets - Array of bucket chains.
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///
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void **Buckets;
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/// NumBuckets - Length of the Buckets array. Always a power of 2.
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///
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unsigned NumBuckets;
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/// NumNodes - Number of nodes in the folding set. Growth occurs when NumNodes
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/// is greater than twice the number of buckets.
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unsigned NumNodes;
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public:
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explicit FoldingSetImpl(unsigned Log2InitSize = 6);
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virtual ~FoldingSetImpl();
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//===--------------------------------------------------------------------===//
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/// Node - This class is used to maintain the singly linked bucket list in
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/// a folding set.
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///
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class Node {
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private:
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// NextInFoldingSetBucket - next link in the bucket list.
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void *NextInFoldingSetBucket;
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public:
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Node() : NextInFoldingSetBucket(0) {}
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// Accessors
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void *getNextInBucket() const { return NextInFoldingSetBucket; }
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void SetNextInBucket(void *N) { NextInFoldingSetBucket = N; }
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};
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/// clear - Remove all nodes from the folding set.
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void clear();
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/// RemoveNode - Remove a node from the folding set, returning true if one
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/// was removed or false if the node was not in the folding set.
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bool RemoveNode(Node *N);
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/// GetOrInsertNode - If there is an existing simple Node exactly
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/// equal to the specified node, return it. Otherwise, insert 'N' and return
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/// it instead.
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Node *GetOrInsertNode(Node *N);
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/// FindNodeOrInsertPos - Look up the node specified by ID. If it exists,
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/// return it. If not, return the insertion token that will make insertion
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/// faster.
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Node *FindNodeOrInsertPos(const FoldingSetNodeID &ID, void *&InsertPos);
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/// InsertNode - Insert the specified node into the folding set, knowing that
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/// it is not already in the folding set. InsertPos must be obtained from
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/// FindNodeOrInsertPos.
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void InsertNode(Node *N, void *InsertPos);
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/// InsertNode - Insert the specified node into the folding set, knowing that
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/// it is not already in the folding set.
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void InsertNode(Node *N) {
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Node *Inserted = GetOrInsertNode(N);
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(void)Inserted;
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assert(Inserted == N && "Node already inserted!");
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}
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/// size - Returns the number of nodes in the folding set.
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unsigned size() const { return NumNodes; }
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/// empty - Returns true if there are no nodes in the folding set.
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bool empty() const { return NumNodes == 0; }
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private:
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/// GrowHashTable - Double the size of the hash table and rehash everything.
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///
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void GrowHashTable();
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protected:
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/// GetNodeProfile - Instantiations of the FoldingSet template implement
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/// this function to gather data bits for the given node.
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virtual void GetNodeProfile(Node *N, FoldingSetNodeID &ID) const = 0;
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/// NodeEquals - Instantiations of the FoldingSet template implement
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/// this function to compare the given node with the given ID.
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virtual bool NodeEquals(Node *N, const FoldingSetNodeID &ID,
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FoldingSetNodeID &TempID) const=0;
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/// NodeEquals - Instantiations of the FoldingSet template implement
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/// this function to compute a hash value for the given node.
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virtual unsigned ComputeNodeHash(Node *N,
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FoldingSetNodeID &TempID) const = 0;
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};
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//===----------------------------------------------------------------------===//
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template<typename T> struct FoldingSetTrait;
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/// DefaultFoldingSetTrait - This class provides default implementations
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/// for FoldingSetTrait implementations.
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///
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template<typename T> struct DefaultFoldingSetTrait {
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static void Profile(const T& X, FoldingSetNodeID& ID) {
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X.Profile(ID);
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}
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static void Profile(T& X, FoldingSetNodeID& ID) {
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X.Profile(ID);
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}
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// Equals - Test if the profile for X would match ID, using TempID
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// to compute a temporary ID if necessary. The default implementation
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// just calls Profile and does a regular comparison. Implementations
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// can override this to provide more efficient implementations.
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static inline bool Equals(T &X, const FoldingSetNodeID &ID,
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FoldingSetNodeID &TempID);
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// ComputeHash - Compute a hash value for X, using TempID to
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// compute a temporary ID if necessary. The default implementation
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// just calls Profile and does a regular hash computation.
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// Implementations can override this to provide more efficient
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// implementations.
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static inline unsigned ComputeHash(T &X, FoldingSetNodeID &TempID);
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};
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/// FoldingSetTrait - This trait class is used to define behavior of how
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/// to "profile" (in the FoldingSet parlance) an object of a given type.
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/// The default behavior is to invoke a 'Profile' method on an object, but
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/// through template specialization the behavior can be tailored for specific
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/// types. Combined with the FoldingSetNodeWrapper class, one can add objects
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/// to FoldingSets that were not originally designed to have that behavior.
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template<typename T> struct FoldingSetTrait
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: public DefaultFoldingSetTrait<T> {};
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template<typename T, typename Ctx> struct ContextualFoldingSetTrait;
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/// DefaultContextualFoldingSetTrait - Like DefaultFoldingSetTrait, but
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/// for ContextualFoldingSets.
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template<typename T, typename Ctx>
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struct DefaultContextualFoldingSetTrait {
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static void Profile(T &X, FoldingSetNodeID &ID, Ctx Context) {
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X.Profile(ID, Context);
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}
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static inline bool Equals(T &X, const FoldingSetNodeID &ID,
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FoldingSetNodeID &TempID, Ctx Context);
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static inline unsigned ComputeHash(T &X, FoldingSetNodeID &TempID,
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Ctx Context);
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};
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/// ContextualFoldingSetTrait - Like FoldingSetTrait, but for
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/// ContextualFoldingSets.
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template<typename T, typename Ctx> struct ContextualFoldingSetTrait
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: public DefaultContextualFoldingSetTrait<T, Ctx> {};
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//===--------------------------------------------------------------------===//
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/// FoldingSetNodeIDRef - This class describes a reference to an interned
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/// FoldingSetNodeID, which can be a useful to store node id data rather
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/// than using plain FoldingSetNodeIDs, since the 32-element SmallVector
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/// is often much larger than necessary, and the possibility of heap
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/// allocation means it requires a non-trivial destructor call.
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class FoldingSetNodeIDRef {
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const unsigned* Data;
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size_t Size;
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public:
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FoldingSetNodeIDRef() : Data(0), Size(0) {}
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FoldingSetNodeIDRef(const unsigned *D, size_t S) : Data(D), Size(S) {}
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/// ComputeHash - Compute a strong hash value for this FoldingSetNodeIDRef,
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/// used to lookup the node in the FoldingSetImpl.
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unsigned ComputeHash() const;
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bool operator==(FoldingSetNodeIDRef) const;
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const unsigned *getData() const { return Data; }
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size_t getSize() const { return Size; }
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};
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//===--------------------------------------------------------------------===//
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/// FoldingSetNodeID - This class is used to gather all the unique data bits of
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/// a node. When all the bits are gathered this class is used to produce a
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/// hash value for the node.
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///
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class FoldingSetNodeID {
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/// Bits - Vector of all the data bits that make the node unique.
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/// Use a SmallVector to avoid a heap allocation in the common case.
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SmallVector<unsigned, 32> Bits;
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public:
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FoldingSetNodeID() {}
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FoldingSetNodeID(FoldingSetNodeIDRef Ref)
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: Bits(Ref.getData(), Ref.getData() + Ref.getSize()) {}
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/// Add* - Add various data types to Bit data.
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///
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void AddPointer(const void *Ptr);
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void AddInteger(signed I);
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void AddInteger(unsigned I);
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void AddInteger(long I);
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void AddInteger(unsigned long I);
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void AddInteger(long long I);
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void AddInteger(unsigned long long I);
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void AddBoolean(bool B) { AddInteger(B ? 1U : 0U); }
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void AddString(StringRef String);
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template <typename T>
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inline void Add(const T& x) { FoldingSetTrait<T>::Profile(x, *this); }
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/// clear - Clear the accumulated profile, allowing this FoldingSetNodeID
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/// object to be used to compute a new profile.
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inline void clear() { Bits.clear(); }
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/// ComputeHash - Compute a strong hash value for this FoldingSetNodeID, used
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/// to lookup the node in the FoldingSetImpl.
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unsigned ComputeHash() const;
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/// operator== - Used to compare two nodes to each other.
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///
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bool operator==(const FoldingSetNodeID &RHS) const;
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bool operator==(const FoldingSetNodeIDRef RHS) const;
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/// Intern - Copy this node's data to a memory region allocated from the
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/// given allocator and return a FoldingSetNodeIDRef describing the
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/// interned data.
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FoldingSetNodeIDRef Intern(BumpPtrAllocator &Allocator) const;
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};
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// Convenience type to hide the implementation of the folding set.
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typedef FoldingSetImpl::Node FoldingSetNode;
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template<class T> class FoldingSetIterator;
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template<class T> class FoldingSetBucketIterator;
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// Definitions of FoldingSetTrait and ContextualFoldingSetTrait functions, which
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// require the definition of FoldingSetNodeID.
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template<typename T>
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inline bool
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DefaultFoldingSetTrait<T>::Equals(T &X, const FoldingSetNodeID &ID,
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FoldingSetNodeID &TempID) {
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FoldingSetTrait<T>::Profile(X, TempID);
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return TempID == ID;
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}
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template<typename T>
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inline unsigned
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DefaultFoldingSetTrait<T>::ComputeHash(T &X, FoldingSetNodeID &TempID) {
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FoldingSetTrait<T>::Profile(X, TempID);
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return TempID.ComputeHash();
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}
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template<typename T, typename Ctx>
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inline bool
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DefaultContextualFoldingSetTrait<T, Ctx>::Equals(T &X,
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const FoldingSetNodeID &ID,
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FoldingSetNodeID &TempID,
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Ctx Context) {
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ContextualFoldingSetTrait<T, Ctx>::Profile(X, TempID, Context);
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return TempID == ID;
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}
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template<typename T, typename Ctx>
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inline unsigned
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DefaultContextualFoldingSetTrait<T, Ctx>::ComputeHash(T &X,
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FoldingSetNodeID &TempID,
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Ctx Context) {
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ContextualFoldingSetTrait<T, Ctx>::Profile(X, TempID, Context);
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return TempID.ComputeHash();
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}
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//===----------------------------------------------------------------------===//
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/// FoldingSet - This template class is used to instantiate a specialized
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/// implementation of the folding set to the node class T. T must be a
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/// subclass of FoldingSetNode and implement a Profile function.
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///
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template<class T> class FoldingSet : public FoldingSetImpl {
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private:
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/// GetNodeProfile - Each instantiatation of the FoldingSet needs to provide a
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/// way to convert nodes into a unique specifier.
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virtual void GetNodeProfile(Node *N, FoldingSetNodeID &ID) const {
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T *TN = static_cast<T *>(N);
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FoldingSetTrait<T>::Profile(*TN, ID);
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}
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/// NodeEquals - Instantiations may optionally provide a way to compare a
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/// node with a specified ID.
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virtual bool NodeEquals(Node *N, const FoldingSetNodeID &ID,
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FoldingSetNodeID &TempID) const {
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T *TN = static_cast<T *>(N);
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return FoldingSetTrait<T>::Equals(*TN, ID, TempID);
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}
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/// NodeEquals - Instantiations may optionally provide a way to compute a
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/// hash value directly from a node.
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virtual unsigned ComputeNodeHash(Node *N,
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FoldingSetNodeID &TempID) const {
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T *TN = static_cast<T *>(N);
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return FoldingSetTrait<T>::ComputeHash(*TN, TempID);
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}
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public:
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explicit FoldingSet(unsigned Log2InitSize = 6)
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: FoldingSetImpl(Log2InitSize)
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{}
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typedef FoldingSetIterator<T> iterator;
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iterator begin() { return iterator(Buckets); }
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iterator end() { return iterator(Buckets+NumBuckets); }
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typedef FoldingSetIterator<const T> const_iterator;
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const_iterator begin() const { return const_iterator(Buckets); }
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const_iterator end() const { return const_iterator(Buckets+NumBuckets); }
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typedef FoldingSetBucketIterator<T> bucket_iterator;
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bucket_iterator bucket_begin(unsigned hash) {
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return bucket_iterator(Buckets + (hash & (NumBuckets-1)));
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}
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bucket_iterator bucket_end(unsigned hash) {
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return bucket_iterator(Buckets + (hash & (NumBuckets-1)), true);
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}
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/// GetOrInsertNode - If there is an existing simple Node exactly
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/// equal to the specified node, return it. Otherwise, insert 'N' and
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/// return it instead.
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T *GetOrInsertNode(Node *N) {
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return static_cast<T *>(FoldingSetImpl::GetOrInsertNode(N));
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}
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/// FindNodeOrInsertPos - Look up the node specified by ID. If it exists,
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/// return it. If not, return the insertion token that will make insertion
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/// faster.
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T *FindNodeOrInsertPos(const FoldingSetNodeID &ID, void *&InsertPos) {
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return static_cast<T *>(FoldingSetImpl::FindNodeOrInsertPos(ID, InsertPos));
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}
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};
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//===----------------------------------------------------------------------===//
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/// ContextualFoldingSet - This template class is a further refinement
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/// of FoldingSet which provides a context argument when calling
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/// Profile on its nodes. Currently, that argument is fixed at
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/// initialization time.
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///
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/// T must be a subclass of FoldingSetNode and implement a Profile
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/// function with signature
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/// void Profile(llvm::FoldingSetNodeID &, Ctx);
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template <class T, class Ctx>
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class ContextualFoldingSet : public FoldingSetImpl {
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// Unfortunately, this can't derive from FoldingSet<T> because the
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// construction vtable for FoldingSet<T> requires
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// FoldingSet<T>::GetNodeProfile to be instantiated, which in turn
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// requires a single-argument T::Profile().
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private:
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Ctx Context;
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/// GetNodeProfile - Each instantiatation of the FoldingSet needs to provide a
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/// way to convert nodes into a unique specifier.
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virtual void GetNodeProfile(FoldingSetImpl::Node *N,
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FoldingSetNodeID &ID) const {
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T *TN = static_cast<T *>(N);
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ContextualFoldingSetTrait<T, Ctx>::Profile(*TN, ID, Context);
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}
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virtual bool NodeEquals(FoldingSetImpl::Node *N,
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const FoldingSetNodeID &ID,
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FoldingSetNodeID &TempID) const {
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T *TN = static_cast<T *>(N);
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return ContextualFoldingSetTrait<T, Ctx>::Equals(*TN, ID, TempID, Context);
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}
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virtual unsigned ComputeNodeHash(FoldingSetImpl::Node *N,
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FoldingSetNodeID &TempID) const {
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T *TN = static_cast<T *>(N);
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return ContextualFoldingSetTrait<T, Ctx>::ComputeHash(*TN, TempID, Context);
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}
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public:
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explicit ContextualFoldingSet(Ctx Context, unsigned Log2InitSize = 6)
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: FoldingSetImpl(Log2InitSize), Context(Context)
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{}
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Ctx getContext() const { return Context; }
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|
|
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typedef FoldingSetIterator<T> iterator;
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iterator begin() { return iterator(Buckets); }
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iterator end() { return iterator(Buckets+NumBuckets); }
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|
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typedef FoldingSetIterator<const T> const_iterator;
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const_iterator begin() const { return const_iterator(Buckets); }
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const_iterator end() const { return const_iterator(Buckets+NumBuckets); }
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typedef FoldingSetBucketIterator<T> bucket_iterator;
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|
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bucket_iterator bucket_begin(unsigned hash) {
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return bucket_iterator(Buckets + (hash & (NumBuckets-1)));
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}
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|
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bucket_iterator bucket_end(unsigned hash) {
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return bucket_iterator(Buckets + (hash & (NumBuckets-1)), true);
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}
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|
|
|
/// GetOrInsertNode - If there is an existing simple Node exactly
|
|
/// equal to the specified node, return it. Otherwise, insert 'N'
|
|
/// and return it instead.
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T *GetOrInsertNode(Node *N) {
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|
return static_cast<T *>(FoldingSetImpl::GetOrInsertNode(N));
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|
}
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|
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|
/// FindNodeOrInsertPos - Look up the node specified by ID. If it
|
|
/// exists, return it. If not, return the insertion token that will
|
|
/// make insertion faster.
|
|
T *FindNodeOrInsertPos(const FoldingSetNodeID &ID, void *&InsertPos) {
|
|
return static_cast<T *>(FoldingSetImpl::FindNodeOrInsertPos(ID, InsertPos));
|
|
}
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// FoldingSetIteratorImpl - This is the common iterator support shared by all
|
|
/// folding sets, which knows how to walk the folding set hash table.
|
|
class FoldingSetIteratorImpl {
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|
protected:
|
|
FoldingSetNode *NodePtr;
|
|
FoldingSetIteratorImpl(void **Bucket);
|
|
void advance();
|
|
|
|
public:
|
|
bool operator==(const FoldingSetIteratorImpl &RHS) const {
|
|
return NodePtr == RHS.NodePtr;
|
|
}
|
|
bool operator!=(const FoldingSetIteratorImpl &RHS) const {
|
|
return NodePtr != RHS.NodePtr;
|
|
}
|
|
};
|
|
|
|
|
|
template<class T>
|
|
class FoldingSetIterator : public FoldingSetIteratorImpl {
|
|
public:
|
|
explicit FoldingSetIterator(void **Bucket) : FoldingSetIteratorImpl(Bucket) {}
|
|
|
|
T &operator*() const {
|
|
return *static_cast<T*>(NodePtr);
|
|
}
|
|
|
|
T *operator->() const {
|
|
return static_cast<T*>(NodePtr);
|
|
}
|
|
|
|
inline FoldingSetIterator& operator++() { // Preincrement
|
|
advance();
|
|
return *this;
|
|
}
|
|
FoldingSetIterator operator++(int) { // Postincrement
|
|
FoldingSetIterator tmp = *this; ++*this; return tmp;
|
|
}
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// FoldingSetBucketIteratorImpl - This is the common bucket iterator support
|
|
/// shared by all folding sets, which knows how to walk a particular bucket
|
|
/// of a folding set hash table.
|
|
|
|
class FoldingSetBucketIteratorImpl {
|
|
protected:
|
|
void *Ptr;
|
|
|
|
explicit FoldingSetBucketIteratorImpl(void **Bucket);
|
|
|
|
FoldingSetBucketIteratorImpl(void **Bucket, bool)
|
|
: Ptr(Bucket) {}
|
|
|
|
void advance() {
|
|
void *Probe = static_cast<FoldingSetNode*>(Ptr)->getNextInBucket();
|
|
uintptr_t x = reinterpret_cast<uintptr_t>(Probe) & ~0x1;
|
|
Ptr = reinterpret_cast<void*>(x);
|
|
}
|
|
|
|
public:
|
|
bool operator==(const FoldingSetBucketIteratorImpl &RHS) const {
|
|
return Ptr == RHS.Ptr;
|
|
}
|
|
bool operator!=(const FoldingSetBucketIteratorImpl &RHS) const {
|
|
return Ptr != RHS.Ptr;
|
|
}
|
|
};
|
|
|
|
|
|
template<class T>
|
|
class FoldingSetBucketIterator : public FoldingSetBucketIteratorImpl {
|
|
public:
|
|
explicit FoldingSetBucketIterator(void **Bucket) :
|
|
FoldingSetBucketIteratorImpl(Bucket) {}
|
|
|
|
FoldingSetBucketIterator(void **Bucket, bool) :
|
|
FoldingSetBucketIteratorImpl(Bucket, true) {}
|
|
|
|
T& operator*() const { return *static_cast<T*>(Ptr); }
|
|
T* operator->() const { return static_cast<T*>(Ptr); }
|
|
|
|
inline FoldingSetBucketIterator& operator++() { // Preincrement
|
|
advance();
|
|
return *this;
|
|
}
|
|
FoldingSetBucketIterator operator++(int) { // Postincrement
|
|
FoldingSetBucketIterator tmp = *this; ++*this; return tmp;
|
|
}
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// FoldingSetNodeWrapper - This template class is used to "wrap" arbitrary
|
|
/// types in an enclosing object so that they can be inserted into FoldingSets.
|
|
template <typename T>
|
|
class FoldingSetNodeWrapper : public FoldingSetNode {
|
|
T data;
|
|
public:
|
|
explicit FoldingSetNodeWrapper(const T& x) : data(x) {}
|
|
virtual ~FoldingSetNodeWrapper() {}
|
|
|
|
template<typename A1>
|
|
explicit FoldingSetNodeWrapper(const A1& a1)
|
|
: data(a1) {}
|
|
|
|
template <typename A1, typename A2>
|
|
explicit FoldingSetNodeWrapper(const A1& a1, const A2& a2)
|
|
: data(a1,a2) {}
|
|
|
|
template <typename A1, typename A2, typename A3>
|
|
explicit FoldingSetNodeWrapper(const A1& a1, const A2& a2, const A3& a3)
|
|
: data(a1,a2,a3) {}
|
|
|
|
template <typename A1, typename A2, typename A3, typename A4>
|
|
explicit FoldingSetNodeWrapper(const A1& a1, const A2& a2, const A3& a3,
|
|
const A4& a4)
|
|
: data(a1,a2,a3,a4) {}
|
|
|
|
template <typename A1, typename A2, typename A3, typename A4, typename A5>
|
|
explicit FoldingSetNodeWrapper(const A1& a1, const A2& a2, const A3& a3,
|
|
const A4& a4, const A5& a5)
|
|
: data(a1,a2,a3,a4,a5) {}
|
|
|
|
|
|
void Profile(FoldingSetNodeID& ID) { FoldingSetTrait<T>::Profile(data, ID); }
|
|
|
|
T& getValue() { return data; }
|
|
const T& getValue() const { return data; }
|
|
|
|
operator T&() { return data; }
|
|
operator const T&() const { return data; }
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// FastFoldingSetNode - This is a subclass of FoldingSetNode which stores
|
|
/// a FoldingSetNodeID value rather than requiring the node to recompute it
|
|
/// each time it is needed. This trades space for speed (which can be
|
|
/// significant if the ID is long), and it also permits nodes to drop
|
|
/// information that would otherwise only be required for recomputing an ID.
|
|
class FastFoldingSetNode : public FoldingSetNode {
|
|
FoldingSetNodeID FastID;
|
|
protected:
|
|
explicit FastFoldingSetNode(const FoldingSetNodeID &ID) : FastID(ID) {}
|
|
public:
|
|
void Profile(FoldingSetNodeID& ID) const { ID = FastID; }
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Partial specializations of FoldingSetTrait.
|
|
|
|
template<typename T> struct FoldingSetTrait<T*> {
|
|
static inline void Profile(const T* X, FoldingSetNodeID& ID) {
|
|
ID.AddPointer(X);
|
|
}
|
|
};
|
|
|
|
template<typename T> struct FoldingSetTrait<const T*> {
|
|
static inline void Profile(const T* X, FoldingSetNodeID& ID) {
|
|
ID.AddPointer(X);
|
|
}
|
|
};
|
|
|
|
} // End of namespace llvm.
|
|
|
|
#endif
|