The category name changed in https://crrev.com/c/2159690 (in depot_tools), hence presubmit tests start failing whenever someone touches a file which still refers to the old category. R=zhin@chromium.org TBR=machenbach@chromium.org No-Try: true No-Tree-Checks: true Change-Id: I62813a42d63e512d421c4fe94229d04a56056978 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2165760 Reviewed-by: Zhi An Ng <zhin@chromium.org> Reviewed-by: Clemens Backes <clemensb@chromium.org> Commit-Queue: Clemens Backes <clemensb@chromium.org> Cr-Commit-Position: refs/heads/master@{#67403}
110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
// Copyright 2020 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef INCLUDE_CPPGC_INTERNAL_PERSISTENT_NODE_H_
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#define INCLUDE_CPPGC_INTERNAL_PERSISTENT_NODE_H_
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#include <array>
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#include <memory>
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#include <vector>
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#include "cppgc/internal/logging.h"
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#include "cppgc/trace-trait.h"
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#include "v8config.h" // NOLINT(build/include_directory)
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namespace cppgc {
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class Visitor;
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namespace internal {
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// PersistentNode represesents a variant of two states:
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// 1) traceable node with a back pointer to the Persistent object;
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// 2) freelist entry.
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class PersistentNode final {
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public:
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PersistentNode() = default;
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PersistentNode(const PersistentNode&) = delete;
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PersistentNode& operator=(const PersistentNode&) = delete;
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void InitializeAsUsedNode(void* owner, TraceCallback trace) {
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owner_ = owner;
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trace_ = trace;
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}
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void InitializeAsFreeNode(PersistentNode* next) {
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next_ = next;
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trace_ = nullptr;
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}
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void UpdateOwner(void* owner) {
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CPPGC_DCHECK(IsUsed());
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owner_ = owner;
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}
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PersistentNode* FreeListNext() const {
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CPPGC_DCHECK(!IsUsed());
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return next_;
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}
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void Trace(Visitor* visitor) const {
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CPPGC_DCHECK(IsUsed());
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trace_(visitor, owner_);
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}
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bool IsUsed() const { return trace_; }
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private:
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// PersistentNode acts as a designated union:
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// If trace_ != nullptr, owner_ points to the corresponding Persistent handle.
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// Otherwise, next_ points to the next freed PersistentNode.
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union {
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void* owner_ = nullptr;
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PersistentNode* next_;
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};
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TraceCallback trace_ = nullptr;
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};
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class V8_EXPORT PersistentRegion {
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using PersistentNodeSlots = std::array<PersistentNode, 256u>;
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public:
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PersistentRegion() = default;
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PersistentRegion(const PersistentRegion&) = delete;
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PersistentRegion& operator=(const PersistentRegion&) = delete;
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PersistentNode* AllocateNode(void* owner, TraceCallback trace) {
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if (!free_list_head_) {
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EnsureNodeSlots();
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}
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PersistentNode* node = free_list_head_;
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free_list_head_ = free_list_head_->FreeListNext();
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node->InitializeAsUsedNode(owner, trace);
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return node;
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}
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void FreeNode(PersistentNode* node) {
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node->InitializeAsFreeNode(free_list_head_);
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free_list_head_ = node;
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}
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void Trace(Visitor*);
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size_t NodesInUse() const;
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private:
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void EnsureNodeSlots();
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std::vector<std::unique_ptr<PersistentNodeSlots>> nodes_;
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PersistentNode* free_list_head_ = nullptr;
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};
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} // namespace internal
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} // namespace cppgc
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#endif // INCLUDE_CPPGC_INTERNAL_PERSISTENT_NODE_H_
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