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BeefRT/gperftools/src/static_vars.h

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+// 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 "tcconfig.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_NAMESPACE {
+
+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_NAMESPACE
+
+#endif  // TCMALLOC_STATIC_VARS_H_