1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- 2 * vim: set ts=8 sts=2 et sw=2 tw=80: 3 * This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #include "BaseProfilingStack.h" 8 9 #include <algorithm> 10 11 #include "mozilla/IntegerRange.h" 12 #include "mozilla/UniquePtr.h" 13 #include "mozilla/UniquePtrExtensions.h" 14 15 #include "BaseProfiler.h" 16 17 namespace mozilla { 18 namespace baseprofiler { 19 ~ProfilingStack()20ProfilingStack::~ProfilingStack() { 21 // The label macros keep a reference to the ProfilingStack to avoid a TLS 22 // access. If these are somehow not all cleared we will get a 23 // use-after-free so better to crash now. 24 MOZ_RELEASE_ASSERT(stackPointer == 0); 25 26 delete[] frames; 27 } 28 ensureCapacitySlow()29void ProfilingStack::ensureCapacitySlow() { 30 MOZ_ASSERT(stackPointer >= capacity); 31 const uint32_t kInitialCapacity = 128; 32 33 uint32_t sp = stackPointer; 34 auto newCapacity = 35 std::max(sp + 1, capacity ? capacity * 2 : kInitialCapacity); 36 37 auto* newFrames = new ProfilingStackFrame[newCapacity]; 38 39 // It's important that `frames` / `capacity` / `stackPointer` remain 40 // consistent here at all times. 41 for (auto i : IntegerRange(capacity)) { 42 newFrames[i] = frames[i]; 43 } 44 45 ProfilingStackFrame* oldFrames = frames; 46 frames = newFrames; 47 capacity = newCapacity; 48 delete[] oldFrames; 49 } 50 51 } // namespace baseprofiler 52 } // namespace mozilla 53