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/static_vars.h b/src/static_vars.h
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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: Ken Ashcraft <opensource@google.com>
+//
+// Static variables shared by multiple classes.
+
+#ifndef TCMALLOC_STATIC_VARS_H_
+#define TCMALLOC_STATIC_VARS_H_
+
+#include <config.h>
+#include "base/spinlock.h"
+#include "central_freelist.h"
+#include "common.h"
+#include "page_heap.h"
+#include "page_heap_allocator.h"
+#include "span.h"
+#include "stack_trace_table.h"
+
+namespace tcmalloc {
+
+class Static {
+ public:
+ // Linker initialized, so this lock can be accessed at any time.
+ static SpinLock* pageheap_lock() { return &pageheap_lock_; }
+
+ // Must be called before calling any of the accessors below.
+ static void InitStaticVars();
+
+ // Central cache -- an array of free-lists, one per size-class.
+ // We have a separate lock per free-list to reduce contention.
+ static CentralFreeListPadded* central_cache() { return central_cache_; }
+
+ static SizeMap* sizemap() { return &sizemap_; }
+
+ //////////////////////////////////////////////////////////////////////
+ // In addition to the explicit initialization comment, the variables below
+ // must be protected by pageheap_lock.
+
+ // Page-level allocator.
+ static PageHeap* pageheap() { return pageheap_; }
+
+ static PageHeapAllocator<Span>* span_allocator() { return &span_allocator_; }
+
+ static PageHeapAllocator<StackTrace>* stacktrace_allocator() {
+ return &stacktrace_allocator_;
+ }
+
+ static StackTrace* growth_stacks() { return growth_stacks_; }
+ static void set_growth_stacks(StackTrace* s) { growth_stacks_ = s; }
+
+ // State kept for sampled allocations (/pprof/heap support)
+ static Span* sampled_objects() { return &sampled_objects_; }
+ static PageHeapAllocator<StackTraceTable::Bucket>* bucket_allocator() {
+ return &bucket_allocator_;
+ }
+
+ // Check if InitStaticVars() has been run.
+ static bool IsInited() { return pageheap() != NULL; }
+
+ private:
+ static SpinLock pageheap_lock_;
+
+ // These static variables require explicit initialization. We cannot
+ // count on their constructors to do any initialization because other
+ // static variables may try to allocate memory before these variables
+ // can run their constructors.
+
+ static SizeMap sizemap_;
+ static CentralFreeListPadded central_cache_[kNumClasses];
+ static PageHeapAllocator<Span> span_allocator_;
+ static PageHeapAllocator<StackTrace> stacktrace_allocator_;
+ static Span sampled_objects_;
+ static PageHeapAllocator<StackTraceTable::Bucket> bucket_allocator_;
+
+ // Linked list of stack traces recorded every time we allocated memory
+ // from the system. Useful for finding allocation sites that cause
+ // increase in the footprint of the system. The linked list pointer
+ // is stored in trace->stack[kMaxStackDepth-1].
+ static StackTrace* growth_stacks_;
+
+ static PageHeap* pageheap_;
+};
+
+} // namespace tcmalloc
+
+#endif // TCMALLOC_STATIC_VARS_H_