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116 lines
4.4 KiB
C++
116 lines
4.4 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Copyright (c) 2008, Google Inc.
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// 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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//
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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 disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ---
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// Author: Ken Ashcraft <opensource@google.com>
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//
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// Static variables shared by multiple classes.
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#ifndef TCMALLOC_STATIC_VARS_H_
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#define TCMALLOC_STATIC_VARS_H_
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#include "config.h"
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#include "base/spinlock.h"
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#include "central_freelist.h"
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#include "common.h"
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#include "page_heap.h"
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#include "page_heap_allocator.h"
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#include "span.h"
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#include "stack_trace_table.h"
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namespace tcmalloc {
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class Static {
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public:
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// Linker initialized, so this lock can be accessed at any time.
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static SpinLock* pageheap_lock() { return &pageheap_lock_; }
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// Must be called before calling any of the accessors below.
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static void InitStaticVars();
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// Central cache -- an array of free-lists, one per size-class.
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// We have a separate lock per free-list to reduce contention.
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static CentralFreeListPadded* central_cache() { return central_cache_; }
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static SizeMap* sizemap() { return &sizemap_; }
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//////////////////////////////////////////////////////////////////////
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// In addition to the explicit initialization comment, the variables below
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// must be protected by pageheap_lock.
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// Page-level allocator.
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static PageHeap* pageheap() { return pageheap_; }
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static PageHeapAllocator<Span>* span_allocator() { return &span_allocator_; }
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static PageHeapAllocator<StackTrace>* stacktrace_allocator() {
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return &stacktrace_allocator_;
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}
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static StackTrace* growth_stacks() { return growth_stacks_; }
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static void set_growth_stacks(StackTrace* s) { growth_stacks_ = s; }
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// State kept for sampled allocations (/pprof/heap support)
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static Span* sampled_objects() { return &sampled_objects_; }
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static PageHeapAllocator<StackTraceTable::Bucket>* bucket_allocator() {
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return &bucket_allocator_;
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}
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// Check if InitStaticVars() has been run.
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static bool IsInited() { return pageheap() != NULL; }
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private:
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static SpinLock pageheap_lock_;
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// These static variables require explicit initialization. We cannot
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// count on their constructors to do any initialization because other
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// static variables may try to allocate memory before these variables
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// can run their constructors.
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static SizeMap sizemap_;
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static CentralFreeListPadded central_cache_[kNumClasses];
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static PageHeapAllocator<Span> span_allocator_;
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static PageHeapAllocator<StackTrace> stacktrace_allocator_;
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static Span sampled_objects_;
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static PageHeapAllocator<StackTraceTable::Bucket> bucket_allocator_;
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// Linked list of stack traces recorded every time we allocated memory
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// from the system. Useful for finding allocation sites that cause
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// increase in the footprint of the system. The linked list pointer
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// is stored in trace->stack[kMaxStackDepth-1].
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static StackTrace* growth_stacks_;
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static PageHeap* pageheap_;
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};
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} // namespace tcmalloc
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#endif // TCMALLOC_STATIC_VARS_H_
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