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This introduces the Annotation object, used to declare typed annotations, and the AnnotationList object, used to reference these. The AnnotationList is referenced by the CrashpadInfo structure. Currently nothing reads these. The AnnotationList implements a lock-free linked list, into which Annotation objects are added exactly once, when they are first set. Clearing an Annotation merely marks it internally as such, rather than removing it from the list. Bug: crashpad:192 Change-Id: I72414b1f83d624c4ae323e09ecea8cfb69a68c5e Reviewed-on: https://chromium-review.googlesource.com/547135 Reviewed-by: Mark Mentovai <mark@chromium.org> Commit-Queue: Robert Sesek <rsesek@chromium.org>
98 lines
3.0 KiB
C++
98 lines
3.0 KiB
C++
// Copyright 2017 The Crashpad Authors. All rights reserved.
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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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#include "client/annotation_list.h"
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#include "base/logging.h"
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#include "client/crashpad_info.h"
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namespace crashpad {
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AnnotationList::AnnotationList()
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: tail_pointer_(&tail_),
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head_(Annotation::Type::kInvalid, nullptr, nullptr),
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tail_(Annotation::Type::kInvalid, nullptr, nullptr) {
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head_.link_node().store(&tail_);
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}
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AnnotationList::~AnnotationList() {}
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// static
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AnnotationList* AnnotationList::Get() {
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return CrashpadInfo::GetCrashpadInfo()->annotations_list();
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}
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// static
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AnnotationList* AnnotationList::Register() {
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AnnotationList* list = Get();
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if (!list) {
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list = new AnnotationList();
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CrashpadInfo::GetCrashpadInfo()->set_annotations_list(list);
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}
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return list;
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}
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void AnnotationList::Add(Annotation* annotation) {
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Annotation* null = nullptr;
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Annotation* head_next = head_.link_node().load(std::memory_order_relaxed);
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if (!annotation->link_node().compare_exchange_strong(null, head_next)) {
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// If |annotation|'s link node is not null, then it has been added to the
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// list already and no work needs to be done.
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return;
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}
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// Check that the annotation's name is less than the maximum size. This is
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// done here, since the Annotation constructor must be constexpr and this
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// path is taken once per annotation.
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DCHECK_LT(strlen(annotation->name_), Annotation::kNameMaxLength);
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// Update the head link to point to the new |annotation|.
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while (!head_.link_node().compare_exchange_weak(head_next, annotation)) {
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// Another thread has updated the head-next pointer, so try again with the
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// re-loaded |head_next|.
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annotation->link_node().store(head_next, std::memory_order_relaxed);
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}
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}
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AnnotationList::Iterator::Iterator(Annotation* head, const Annotation* tail)
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: curr_(head), tail_(tail) {}
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AnnotationList::Iterator::~Iterator() = default;
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Annotation* AnnotationList::Iterator::operator*() const {
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CHECK_NE(curr_, tail_);
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return curr_;
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}
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AnnotationList::Iterator& AnnotationList::Iterator::operator++() {
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CHECK_NE(curr_, tail_);
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curr_ = curr_->link_node();
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return *this;
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}
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bool AnnotationList::Iterator::operator==(
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const AnnotationList::Iterator& other) const {
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return curr_ == other.curr_;
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}
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AnnotationList::Iterator AnnotationList::begin() {
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return Iterator(head_.link_node(), tail_pointer_);
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}
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AnnotationList::Iterator AnnotationList::end() {
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return Iterator(&tail_, tail_pointer_);
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}
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} // namespace crashpad
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