355 lines
11 KiB
C++
355 lines
11 KiB
C++
/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation, nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <LocHeap.h>
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class LocHeapNode {
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friend class LocHeap;
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// size of of the subtree, excluding self, 1 if no subtree
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int mSize;
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LocHeapNode* mLeft;
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LocHeapNode* mRight;
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LocRankable* mData;
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public:
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inline LocHeapNode(LocRankable& data) :
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mSize(1), mLeft(NULL), mRight(NULL), mData(&data) {}
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~LocHeapNode();
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// this only swaps the data of the two nodes, so no
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// detach / re-attached is necessary
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void swap(LocHeapNode& node);
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LocRankable* detachData();
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// push a node into the tree stucture, keeping sorted by rank
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void push(LocHeapNode& node);
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// pop the head node out of the tree stucture. keeping sorted by rank
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static LocHeapNode* pop(LocHeapNode*& top);
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// remove a specific node from the tree
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// returns the pointer to the node removed, which would be either the
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// same as input (if successfully removed); or NULL (if failed).
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static LocHeapNode* remove(LocHeapNode*& top, LocRankable& data);
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// convenience method to compare data ranking
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inline bool outRanks(LocHeapNode& node) { return mData->outRanks(*node.mData); }
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inline bool outRanks(LocRankable& data) { return mData->outRanks(data); }
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// checks if mSize is correct, AND this node is the highest ranking
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// of the entire subtree
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bool checkNodes();
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inline int getSize() { return mSize; }
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};
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inline
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LocHeapNode::~LocHeapNode() {
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if (mLeft) {
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delete mLeft;
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mLeft = NULL;
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}
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if (mRight) {
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delete mRight;
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mRight = NULL;
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}
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if (mData) {
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mData = NULL;
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}
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}
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inline
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void LocHeapNode::swap(LocHeapNode& node) {
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LocRankable* tmpData = node.mData;
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node.mData = mData;
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mData = tmpData;
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}
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inline
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LocRankable* LocHeapNode::detachData() {
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LocRankable* data = mData;
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mData = NULL;
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return data;
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}
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// push keeps the tree sorted by rank, it also tries to balance the
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// tree by adding the new node to the smaller of the subtrees.
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// The pointer to the tree and internal links never change. If the
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// mData of tree top ranks lower than that of the incoming node,
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// mData will be swapped with that of the incoming node to ensure
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// ranking, no restructuring the container nodes.
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void LocHeapNode::push(LocHeapNode& node) {
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// ensure the current node ranks higher than in the incoming one
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if (node.outRanks(*this)) {
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swap(node);
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}
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// now drop the new node (ensured lower than *this) into a subtree
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if (NULL == mLeft) {
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mLeft = &node;
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} else if (NULL == mRight) {
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mRight = &node;
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} else if (mLeft->mSize <= mRight->mSize) {
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mLeft->push(node);
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} else {
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mRight->push(node);
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}
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mSize++;
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}
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// pop keeps the tree sorted by rank, but it does not try to balance
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// the tree. It recursively swaps with the higher ranked top of the
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// subtrees.
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// The return is a popped out node from leaf level, that has the data
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// swapped all the way down from the top. The pinter to the tree and
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// internal links will not be changed or restructured, except for the
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// node that is popped out.
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// If the return pointer == this, this the last node in the tree.
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LocHeapNode* LocHeapNode::pop(LocHeapNode*& top) {
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// we know the top has the highest ranking at this point, else
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// the tree is broken. This top will be popped out. But we need
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// a node from the left or right child, whichever ranks higher,
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// to replace the current top. This then will need to be done
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// recursively to the leaf level. So we swap the mData of the
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// current top node all the way down to the leaf level.
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LocHeapNode* poppedNode = top;
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// top is losing a node in its subtree
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top->mSize--;
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if (top->mLeft || top->mRight) {
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// if mLeft is NULL, mRight for sure is NOT NULL, take that;
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// else if mRight is NULL, mLeft for sure is NOT, take that;
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// else we take the address of whatever has higher ranking mData
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LocHeapNode*& subTop = (NULL == top->mLeft) ? top->mRight :
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((NULL == top->mRight) ? top->mLeft :
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(top->mLeft->outRanks(*(top->mRight)) ? top->mLeft : top->mRight));
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// swap mData, the tree top gets updated with the new data.
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top->swap(*subTop);
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// pop out from the subtree
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poppedNode = pop(subTop);
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} else {
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// if the top has only single node
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// detach the poppedNode from the tree
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// subTop is the reference of ether mLeft or mRight
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// NOT a local stack pointer. so it MUST be NULL'ed here.
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top = NULL;
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}
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return poppedNode;
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}
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// navigating through the tree and find the node that hass the input
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// data. Since this is a heap, we do recursive linear search.
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// returns the pointer to the node removed, which would be either the
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// same as input (if successfully removed); or NULL (if failed).
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LocHeapNode* LocHeapNode::remove(LocHeapNode*& top, LocRankable& data) {
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LocHeapNode* removedNode = NULL;
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// this is the node, by address
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if (&data == (LocRankable*)(top->mData)) {
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// pop this node out
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removedNode = pop(top);
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} else if (!data.outRanks(*top->mData)) {
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// subtrees might have this node
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if (top->mLeft) {
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removedNode = remove(top->mLeft, data);
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}
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// if we did not find in mLeft, and mRight is not empty
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if (!removedNode && top->mRight) {
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removedNode = remove(top->mRight, data);
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}
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// top lost a node in its subtree
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if (removedNode) {
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top->mSize--;
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}
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}
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return removedNode;
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}
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// checks if mSize is correct, AND this node is the highest ranking
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// of the entire subtree
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bool LocHeapNode::checkNodes() {
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// size of the current subtree
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int totalSize = mSize;
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if (mLeft) {
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// check the consistency of left subtree
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if (mLeft->outRanks(*this) || !mLeft->checkNodes()) {
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return false;
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}
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// subtract the size of left subtree (with subtree head)
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totalSize -= mLeft->mSize;
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}
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if (mRight) {
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// check the consistency of right subtree
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if (mRight->outRanks(*this) || !mRight->checkNodes()) {
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return false;
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}
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// subtract the size of right subtree (with subtree head)
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totalSize -= mRight->mSize;
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}
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// for the tree nodes to consistent, totalSize must be 1 now
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return totalSize == 1;
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}
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LocHeap::~LocHeap() {
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if (mTree) {
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delete mTree;
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}
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}
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void LocHeap::push(LocRankable& node) {
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LocHeapNode* heapNode = new LocHeapNode(node);
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if (!mTree) {
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mTree = heapNode;
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} else {
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mTree->push(*heapNode);
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}
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}
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LocRankable* LocHeap::peek() {
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LocRankable* top = NULL;
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if (mTree) {
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top = mTree->mData;
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}
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return top;
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}
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LocRankable* LocHeap::pop() {
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LocRankable* locNode = NULL;
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if (mTree) {
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// mTree may become NULL after this call
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LocHeapNode* heapNode = LocHeapNode::pop(mTree);
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locNode = heapNode->detachData();
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delete heapNode;
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}
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return locNode;
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}
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LocRankable* LocHeap::remove(LocRankable& rankable) {
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LocRankable* locNode = NULL;
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if (mTree) {
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// mTree may become NULL after this call
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LocHeapNode* heapNode = LocHeapNode::remove(mTree, rankable);
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if (heapNode) {
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locNode = heapNode->detachData();
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delete heapNode;
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}
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}
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return locNode;
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}
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#ifdef __LOC_UNIT_TEST__
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bool LocHeap::checkTree() {
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return ((NULL == mTree) || mTree->checkNodes());
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}
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uint32_t LocHeap::getTreeSize() {
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return (NULL == mTree) ? 0 : mTree->getSize();
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}
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#endif
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#ifdef __LOC_DEBUG__
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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class LocHeapDebug : public LocHeap {
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public:
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bool checkTree() {
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return ((NULL == mTree) || mTree->checkNodes());
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}
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uint32_t getTreeSize() {
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return (NULL == mTree) ? 0 : (mTree->getSize());
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}
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};
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class LocHeapDebugData : public LocRankable {
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const int mID;
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public:
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LocHeapDebugData(int id) : mID(id) {}
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inline virtual int ranks(LocRankable& rankable) {
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LocHeapDebugData* testData = dynamic_cast<LocHeapDebugData*>(&rankable);
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return testData->mID - mID;
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}
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};
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// For Linux command line testing:
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// compilation: g++ -D__LOC_HOST_DEBUG__ -D__LOC_DEBUG__ -g -I. -I../../../../vendor/qcom/proprietary/gps-internal/unit-tests/fakes_for_host -I../../../../system/core/include LocHeap.cpp
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// test: valgrind --leak-check=full ./a.out 100
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int main(int argc, char** argv) {
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srand(time(NULL));
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int tries = atoi(argv[1]);
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int checks = tries >> 3;
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LocHeapDebug heap;
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int treeSize = 0;
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for (int i = 0; i < tries; i++) {
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if (i % checks == 0 && !heap.checkTree()) {
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printf("tree check failed before %dth op\n", i);
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}
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int r = rand();
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if (r & 1) {
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LocHeapDebugData* data = new LocHeapDebugData(r >> 1);
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heap.push(dynamic_cast<LocRankable&>(*data));
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treeSize++;
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} else {
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LocRankable* rankable = heap.pop();
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if (rankable) {
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delete rankable;
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}
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treeSize ? treeSize-- : 0;
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}
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printf("%s: %d == %d\n", (r&1)?"push":"pop", treeSize, heap.getTreeSize());
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if (treeSize != heap.getTreeSize()) {
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printf("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n");
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tries = i+1;
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break;
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}
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}
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if (!heap.checkTree()) {
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printf("!!!!!!!!!!tree check failed at the end after %d ops!!!!!!!\n", tries);
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} else {
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printf("success!\n");
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}
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for (LocRankable* data = heap.pop(); NULL != data; data = heap.pop()) {
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delete data;
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}
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return 0;
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}
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#endif
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