151 lines
4.5 KiB
C++
151 lines
4.5 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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namespace folly {
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inline void checkAsyncStackFrameIsActive(
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FOLLY_MAYBE_UNUSED const folly::AsyncStackFrame& frame) noexcept {
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(void)frame;
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assert(frame.stackRoot != nullptr);
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assert(tryGetCurrentAsyncStackRoot() == frame.stackRoot);
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assert(frame.stackRoot->topFrame.load(std::memory_order_relaxed) == &frame);
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}
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inline void activateAsyncStackFrame(
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folly::AsyncStackRoot& root, folly::AsyncStackFrame& frame) noexcept {
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assert(tryGetCurrentAsyncStackRoot() == &root);
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root.setTopFrame(frame);
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}
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inline void deactivateAsyncStackFrame(folly::AsyncStackFrame& frame) noexcept {
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checkAsyncStackFrameIsActive(frame);
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frame.stackRoot->topFrame.store(nullptr, std::memory_order_relaxed);
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frame.stackRoot = nullptr;
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}
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inline void pushAsyncStackFrameCallerCallee(
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folly::AsyncStackFrame& callerFrame,
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folly::AsyncStackFrame& calleeFrame) noexcept {
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checkAsyncStackFrameIsActive(callerFrame);
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calleeFrame.stackRoot = callerFrame.stackRoot;
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calleeFrame.parentFrame = &callerFrame;
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calleeFrame.stackRoot->topFrame.store(
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&calleeFrame, std::memory_order_release);
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// Clearing out non-top-frame's stackRoot is not strictly necessary
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// but it may help with debugging.
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callerFrame.stackRoot = nullptr;
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}
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inline void popAsyncStackFrameCallee(
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folly::AsyncStackFrame& calleeFrame) noexcept {
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checkAsyncStackFrameIsActive(calleeFrame);
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auto* callerFrame = calleeFrame.parentFrame;
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auto* stackRoot = calleeFrame.stackRoot;
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if (callerFrame != nullptr) {
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callerFrame->stackRoot = stackRoot;
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}
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stackRoot->topFrame.store(callerFrame, std::memory_order_release);
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// Clearing out non-top-frame's stackRoot is not strictly necessary
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// but it may help with debugging.
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calleeFrame.stackRoot = nullptr;
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}
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inline size_t getAsyncStackTraceFromInitialFrame(
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folly::AsyncStackFrame* initialFrame,
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std::uintptr_t* addresses,
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size_t maxAddresses) {
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size_t numFrames = 0;
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for (auto* frame = initialFrame; frame != nullptr && numFrames < maxAddresses;
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frame = frame->getParentFrame()) {
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addresses[numFrames++] =
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reinterpret_cast<std::uintptr_t>(frame->getReturnAddress());
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}
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return numFrames;
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}
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#if FOLLY_HAS_COROUTINES
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template <typename Promise>
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void resumeCoroutineWithNewAsyncStackRoot(
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coro::coroutine_handle<Promise> h) noexcept {
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resumeCoroutineWithNewAsyncStackRoot(h, h.promise().getAsyncFrame());
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}
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#endif
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inline AsyncStackFrame* AsyncStackFrame::getParentFrame() noexcept {
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return parentFrame;
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}
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inline const AsyncStackFrame* AsyncStackFrame::getParentFrame() const noexcept {
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return parentFrame;
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}
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inline void AsyncStackFrame::setParentFrame(AsyncStackFrame& frame) noexcept {
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parentFrame = &frame;
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}
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inline AsyncStackRoot* AsyncStackFrame::getStackRoot() noexcept {
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return stackRoot;
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}
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inline void AsyncStackFrame::setReturnAddress(void* p) noexcept {
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instructionPointer = p;
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}
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inline void* AsyncStackFrame::getReturnAddress() const noexcept {
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return instructionPointer;
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}
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inline void AsyncStackRoot::setTopFrame(AsyncStackFrame& frame) noexcept {
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assert(this->topFrame.load(std::memory_order_relaxed) == nullptr);
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assert(frame.stackRoot == nullptr);
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frame.stackRoot = this;
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this->topFrame.store(&frame, std::memory_order_release);
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}
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inline AsyncStackFrame* AsyncStackRoot::getTopFrame() const noexcept {
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return topFrame.load(std::memory_order_relaxed);
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}
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inline void AsyncStackRoot::setStackFrameContext(
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void* framePtr, void* ip) noexcept {
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stackFramePtr = framePtr;
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returnAddress = ip;
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}
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inline void* AsyncStackRoot::getStackFramePointer() const noexcept {
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return stackFramePtr;
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}
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inline void* AsyncStackRoot::getReturnAddress() const noexcept {
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return returnAddress;
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}
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inline const AsyncStackRoot* AsyncStackRoot::getNextRoot() const noexcept {
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return nextRoot;
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}
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inline void AsyncStackRoot::setNextRoot(AsyncStackRoot* next) noexcept {
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nextRoot = next;
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}
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} // namespace folly
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