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Diffstat (limited to 'trunk/src/span.cc')
-rw-r--r-- | trunk/src/span.cc | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/trunk/src/span.cc b/trunk/src/span.cc new file mode 100644 index 0000000..ca0bab3 --- /dev/null +++ b/trunk/src/span.cc @@ -0,0 +1,111 @@ +// 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" + +#ifdef HAVE_INTTYPES_H +#include <inttypes.h> +#endif + +#include "static_vars.h" + +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; +} + +#if 0 // This isn't used. If that changes, rewrite to use TCMalloc_Printer. +void DLL_Print(const char* label, const Span* list) { + MESSAGE("%-10s %p:", label, list); + for (const Span* s = list->next; s != list; s = s->next) { + MESSAGE(" <%p,%"PRIuPTR",%"PRIuPTR">", s, s->start, s->length); + } + MESSAGE("%s\n", ""); // %s is to get around a compiler error. +} +#endif + +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 |