X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2Filist.h;h=ba9864a98a7e8d72ee1f0b4df6da69701c2e7f39;hb=ac24e251014de60a16558fc0a1f2340c334d2aa8;hp=962a29d0ff2076e8541fe8be5ff00358a0c74826;hpb=b141e397d52d9946e93f84c65c6b2e653b026041;p=oota-llvm.git diff --git a/include/llvm/ADT/ilist.h b/include/llvm/ADT/ilist.h index 962a29d0ff2..ba9864a98a7 100644 --- a/include/llvm/ADT/ilist.h +++ b/include/llvm/ADT/ilist.h @@ -38,8 +38,10 @@ #ifndef LLVM_ADT_ILIST_H #define LLVM_ADT_ILIST_H -#include "llvm/ADT/iterator.h" +#include #include +#include +#include namespace llvm { @@ -60,13 +62,45 @@ struct ilist_nextprev_traits { static void setNext(NodeTy *N, NodeTy *Next) { N->setNext(Next); } }; +template +struct ilist_traits; + /// ilist_sentinel_traits - A fragment for template traits for intrusive list /// that provides default sentinel implementations for common operations. /// +/// ilist_sentinel_traits implements a lazy dynamic sentinel allocation +/// strategy. The sentinel is stored in the prev field of ilist's Head. +/// template struct ilist_sentinel_traits { + /// createSentinel - create the dynamic sentinel static NodeTy *createSentinel() { return new NodeTy(); } + + /// destroySentinel - deallocate the dynamic sentinel static void destroySentinel(NodeTy *N) { delete N; } + + /// provideInitialHead - when constructing an ilist, provide a starting + /// value for its Head + /// @return null node to indicate that it needs to be allocated later + static NodeTy *provideInitialHead() { return 0; } + + /// ensureHead - make sure that Head is either already + /// initialized or assigned a fresh sentinel + /// @return the sentinel + static NodeTy *ensureHead(NodeTy *&Head) { + if (!Head) { + Head = ilist_traits::createSentinel(); + ilist_traits::noteHead(Head, Head); + ilist_traits::setNext(Head, 0); + return Head; + } + return ilist_traits::getPrev(Head); + } + + /// noteHead - stash the sentinel into its default location + static void noteHead(NodeTy *NewHead, NodeTy *Sentinel) { + ilist_traits::setPrev(NewHead, Sentinel); + } }; /// ilist_node_traits - A fragment for template traits for intrusive list @@ -89,15 +123,15 @@ struct ilist_node_traits { /// for all common operations. /// template -struct ilist_default_traits : ilist_nextprev_traits, - ilist_sentinel_traits, - ilist_node_traits { +struct ilist_default_traits : public ilist_nextprev_traits, + public ilist_sentinel_traits, + public ilist_node_traits { }; // Template traits for intrusive list. By specializing this template class, you // can change what next/prev fields are used to store the links... template -struct ilist_traits : ilist_default_traits {}; +struct ilist_traits : public ilist_default_traits {}; // Const traits are the same as nonconst traits... template @@ -108,11 +142,12 @@ struct ilist_traits : public ilist_traits {}; // template class ilist_iterator - : public bidirectional_iterator { + : public std::iterator { public: typedef ilist_traits Traits; - typedef bidirectional_iterator super; + typedef std::iterator super; typedef typename super::value_type value_type; typedef typename super::difference_type difference_type; @@ -157,12 +192,10 @@ public: // Accessors... operator pointer() const { - assert(Traits::getNext(NodePtr) != 0 && "Dereferencing end()!"); return NodePtr; } reference operator*() const { - assert(Traits::getNext(NodePtr) != 0 && "Dereferencing end()!"); return *NodePtr; } pointer operator->() const { return &operator*(); } @@ -178,12 +211,11 @@ public: // Increment and decrement operators... ilist_iterator &operator--() { // predecrement - Back up NodePtr = Traits::getPrev(NodePtr); - assert(Traits::getNext(NodePtr) && "--'d off the beginning of an ilist!"); + assert(NodePtr && "--'d off the beginning of an ilist!"); return *this; } ilist_iterator &operator++() { // preincrement - Advance NodePtr = Traits::getNext(NodePtr); - assert(NodePtr && "++'d off the end of an ilist!"); return *this; } ilist_iterator operator--(int) { // postdecrement operators... @@ -257,7 +289,7 @@ template struct simplify_type > { //===----------------------------------------------------------------------===// // /// iplist - The subset of list functionality that can safely be used on nodes -/// of polymorphic types, i.e. a heterogenous list with a common base class that +/// of polymorphic types, i.e. a heterogeneous list with a common base class that /// holds the next/prev pointers. The only state of the list itself is a single /// pointer to the head of the list. /// @@ -284,23 +316,20 @@ class iplist : public Traits { // circularly linked list where we snip the 'next' link from the sentinel node // back to the first node in the list (to preserve assertions about going off // the end of the list). - NodeTy *getTail() { return this->getPrev(Head); } - const NodeTy *getTail() const { return this->getPrev(Head); } - void setTail(NodeTy *N) const { this->setPrev(Head, N); } + NodeTy *getTail() { return this->ensureHead(Head); } + const NodeTy *getTail() const { return this->ensureHead(Head); } + void setTail(NodeTy *N) const { this->noteHead(Head, N); } /// CreateLazySentinel - This method verifies whether the sentinel for the /// list has been created and lazily makes it if not. void CreateLazySentinel() const { - if (Head != 0) return; - Head = Traits::createSentinel(); - this->setNext(Head, 0); - setTail(Head); + this->ensureHead(Head); } static bool op_less(NodeTy &L, NodeTy &R) { return L < R; } static bool op_equal(NodeTy &L, NodeTy &R) { return L == R; } - // No fundamental reason why iplist can't by copyable, but the default + // No fundamental reason why iplist can't be copyable, but the default // copy/copy-assign won't do. iplist(const iplist &); // do not implement void operator=(const iplist &); // do not implement @@ -318,7 +347,7 @@ public: typedef std::reverse_iterator const_reverse_iterator; typedef std::reverse_iterator reverse_iterator; - iplist() : Head(0) {} + iplist() : Head(this->provideInitialHead()) {} ~iplist() { if (!Head) return; clear(); @@ -452,8 +481,8 @@ private: L2.setTail(0); // Remove [first, last) from its old position. - NodeTy *First = &*first, *Prev = getPrev(First); - NodeTy *Next = last.getNodePtrUnchecked(), *Last = getPrev(Next); + NodeTy *First = &*first, *Prev = this->getPrev(First); + NodeTy *Next = last.getNodePtrUnchecked(), *Last = this->getPrev(Next); if (Prev) this->setNext(Prev, Next); else @@ -462,7 +491,7 @@ private: // Splice [first, last) into its new position. NodeTy *PosNext = position.getNodePtrUnchecked(); - NodeTy *PosPrev = getPrev(PosNext); + NodeTy *PosPrev = this->getPrev(PosNext); // Fix head of list... if (PosPrev) @@ -475,7 +504,7 @@ private: this->setNext(Last, PosNext); this->setPrev(PosNext, Last); - transferNodesFromList(L2, First, PosNext); + this->transferNodesFromList(L2, First, PosNext); // Now that everything is set, restore the pointers to the list sentinels. L2.setTail(L2Sentinel); @@ -491,14 +520,7 @@ public: size_type size() const { if (Head == 0) return 0; // Don't require construction of sentinel if empty. -#if __GNUC__ == 2 - // GCC 2.95 has a broken std::distance - size_type Result = 0; - std::distance(begin(), end(), Result); - return Result; -#else return std::distance(begin(), end()); -#endif } iterator erase(iterator first, iterator last) { @@ -593,7 +615,6 @@ public: template void sort(Pr3 pred); void sort() { sort(op_less); } - void reverse(); }; @@ -616,18 +637,14 @@ struct ilist : public iplist { insert(this->begin(), first, last); } - - // Forwarding functions: A workaround for GCC 2.95 which does not correctly - // support 'using' declarations to bring a hidden member into scope. - // - iterator insert(iterator a, NodeTy *b){ return iplist::insert(a, b); } - void push_front(NodeTy *a) { iplist::push_front(a); } - void push_back(NodeTy *a) { iplist::push_back(a); } - + // bring hidden functions into scope + using iplist::insert; + using iplist::push_front; + using iplist::push_back; // Main implementation here - Insert for a node passed by value... iterator insert(iterator where, const NodeTy &val) { - return insert(where, createNode(val)); + return insert(where, this->createNode(val)); } @@ -635,10 +652,6 @@ struct ilist : public iplist { void push_front(const NodeTy &val) { insert(this->begin(), val); } void push_back(const NodeTy &val) { insert(this->end(), val); } - // Special forms of insert... - template void insert(iterator where, InIt first, InIt last) { - for (; first != last; ++first) insert(where, *first); - } void insert(iterator where, size_type count, const NodeTy &val) { for (; count != 0; --count) insert(where, val); }