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BeefRT/gperftools/src/heap-checker-bcad.cc

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+// Copyright (c) 2005, 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.
+
+// ---
+// All Rights Reserved.
+//
+// Author: Maxim Lifantsev
+//
+// A file to ensure that components of heap leak checker run before
+// all global object constructors and after all global object
+// destructors.
+//
+// This file must be the last library any binary links against.
+// Otherwise, the heap checker may not be able to run early enough to
+// catalog all the global objects in your program.  If this happens,
+// and later in the program you allocate memory and have one of these
+// "uncataloged" global objects point to it, the heap checker will
+// consider that allocation to be a leak, even though it's not (since
+// the allocated object is reachable from global data and hence "live").
+
+#include <stdlib.h>      // for abort()
+#include <gperftools/malloc_extension.h>
+
+// A dummy variable to refer from heap-checker.cc.  This is to make
+// sure this file is not optimized out by the linker.
+bool heap_leak_checker_bcad_variable;
+
+extern void HeapLeakChecker_AfterDestructors();  // in heap-checker.cc
+
+// A helper class to ensure that some components of heap leak checking
+// can happen before construction and after destruction
+// of all global/static objects.
+class HeapLeakCheckerGlobalPrePost {
+ public:
+  HeapLeakCheckerGlobalPrePost() {
+    if (count_ == 0) {
+      // The 'new int' will ensure that we have run an initial malloc
+      // hook, which will set up the heap checker via
+      // MallocHook_InitAtFirstAllocation_HeapLeakChecker.  See malloc_hook.cc.
+      // This is done in this roundabout fashion in order to avoid self-deadlock
+      // if we directly called HeapLeakChecker_BeforeConstructors here.
+      delete new int;
+      // This needs to be called before the first allocation of an STL
+      // object, but after libc is done setting up threads (because it
+      // calls setenv, which requires a thread-aware errno).  By
+      // putting it here, we hope it's the first bit of code executed
+      // after the libc global-constructor code.
+      MallocExtension::Initialize();
+    }
+    ++count_;
+  }
+  ~HeapLeakCheckerGlobalPrePost() {
+    if (count_ <= 0)  abort();
+    --count_;
+    if (count_ == 0)  HeapLeakChecker_AfterDestructors();
+  }
+ private:
+  // Counter of constructions/destructions of objects of this class
+  // (just in case there are more than one of them).
+  static int count_;
+};
+
+int HeapLeakCheckerGlobalPrePost::count_ = 0;
+
+// The early-construction/late-destruction global object.
+static const HeapLeakCheckerGlobalPrePost heap_leak_checker_global_pre_post;