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- // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
- // Copyright (c) 2008, Google Inc.
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without
- // modification, are permitted provided that the following conditions are
- // met:
- //
- // * Redistributions of source code must retain the above copyright
- // notice, this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above
- // copyright notice, this list of conditions and the following disclaimer
- // in the documentation and/or other materials provided with the
- // distribution.
- // * Neither the name of Google Inc. nor the names of its
- // contributors may be used to endorse or promote products derived from
- // this software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- // ---
- // Author: Sanjay Ghemawat <opensource@google.com>
- #include <config.h>
- #include "span.h"
- #include <string.h> // for NULL, memset
- #include "internal_logging.h" // for ASSERT
- #include "page_heap_allocator.h" // for PageHeapAllocator
- #include "static_vars.h" // for Static
- namespace tcmalloc {
- #ifdef SPAN_HISTORY
- void Event(Span* span, char op, int v = 0) {
- span->history[span->nexthistory] = op;
- span->value[span->nexthistory] = v;
- span->nexthistory++;
- if (span->nexthistory == sizeof(span->history)) span->nexthistory = 0;
- }
- #endif
- Span* NewSpan(PageID p, Length len) {
- Span* result = Static::span_allocator()->New();
- memset(result, 0, sizeof(*result));
- result->start = p;
- result->length = len;
- #ifdef SPAN_HISTORY
- result->nexthistory = 0;
- #endif
- return result;
- }
- void DeleteSpan(Span* span) {
- #ifndef NDEBUG
- // In debug mode, trash the contents of deleted Spans
- memset(span, 0x3f, sizeof(*span));
- #endif
- Static::span_allocator()->Delete(span);
- }
- void DLL_Init(Span* list) {
- list->next = list;
- list->prev = list;
- }
- void DLL_Remove(Span* span) {
- span->prev->next = span->next;
- span->next->prev = span->prev;
- span->prev = NULL;
- span->next = NULL;
- }
- int DLL_Length(const Span* list) {
- int result = 0;
- for (Span* s = list->next; s != list; s = s->next) {
- result++;
- }
- return result;
- }
- void DLL_Prepend(Span* list, Span* span) {
- ASSERT(span->next == NULL);
- ASSERT(span->prev == NULL);
- span->next = list->next;
- span->prev = list;
- list->next->prev = span;
- list->next = span;
- }
- } // namespace tcmalloc
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