Squashed 'third_party/gperftools/' content from commit 54505f1
Change-Id: Id02e833828732b0efe7dac722b8485279e67c5fa
git-subtree-dir: third_party/gperftools
git-subtree-split: 54505f1d50c2d1f4676f5e87090b64a117fd980e
diff --git a/src/span.cc b/src/span.cc
new file mode 100644
index 0000000..4d08964
--- /dev/null
+++ b/src/span.cc
@@ -0,0 +1,102 @@
+// -*- 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