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// Copyright 2023 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_V8_HANDLE_BASE_H_
#define INCLUDE_V8_HANDLE_BASE_H_
#include "v8-internal.h" // NOLINT(build/include_directory)
namespace v8::api_internal {
template <bool check_statically_enabled>
class StackAllocated {
public:
V8_INLINE StackAllocated() = default;
protected:
struct no_checking_tag {};
static constexpr no_checking_tag do_not_check{};
V8_INLINE explicit StackAllocated(no_checking_tag) {}
V8_INLINE explicit StackAllocated(const StackAllocated& other,
no_checking_tag) {}
V8_INLINE void VerifyOnStack() const {}
};
template <>
class V8_TRIVIAL_ABI StackAllocated<true> : public StackAllocated<false> {
public:
V8_INLINE StackAllocated() { VerifyOnStack(); }
#if V8_HAS_ATTRIBUTE_TRIVIAL_ABI
// In this case, StackAllocated becomes not trivially copyable.
V8_INLINE StackAllocated(const StackAllocated& other) { VerifyOnStack(); }
StackAllocated& operator=(const StackAllocated&) = default;
#endif
protected:
V8_INLINE explicit StackAllocated(no_checking_tag tag)
: StackAllocated<false>(tag) {}
V8_INLINE explicit StackAllocated(const StackAllocated& other,
no_checking_tag tag)
: StackAllocated<false>(other, tag) {}
V8_EXPORT void VerifyOnStack() const;
};
/**
* A base class for abstract handles containing indirect pointers.
* These are useful regardless of whether direct local support is enabled.
*/
class IndirectHandleBase {
public:
// Returns true if the handle is empty.
V8_INLINE bool IsEmpty() const { return location_ == nullptr; }
// Sets the handle to be empty. IsEmpty() will then return true.
V8_INLINE void Clear() { location_ = nullptr; }
protected:
friend class internal::ValueHelper;
friend class internal::HandleHelper;
V8_INLINE IndirectHandleBase() = default;
V8_INLINE IndirectHandleBase(const IndirectHandleBase& other) = default;
V8_INLINE IndirectHandleBase& operator=(const IndirectHandleBase& that) =
default;
V8_INLINE explicit IndirectHandleBase(internal::Address* location)
: location_(location) {}
// Returns the address of the actual heap object (tagged).
// This method must be called only if the handle is not empty, otherwise it
// will crash.
V8_INLINE internal::Address ptr() const { return *location_; }
// Returns a reference to the slot (indirect pointer).
V8_INLINE internal::Address* const& slot() const { return location_; }
V8_INLINE internal::Address*& slot() { return location_; }
// Returns the handler's "value" (direct or indirect pointer, depending on
// whether direct local support is enabled).
template <typename T, bool check_null = false>
V8_INLINE T* value() const {
return internal::ValueHelper::SlotAsValue<T, check_null>(slot());
}
private:
internal::Address* location_ = nullptr;
};
#ifdef V8_ENABLE_DIRECT_LOCAL
/**
* A base class for abstract handles containing direct pointers.
* These are only possible when conservative stack scanning is enabled.
*/
class DirectHandleBase {
public:
// Returns true if the handle is empty.
V8_INLINE bool IsEmpty() const {
return ptr_ == internal::ValueHelper::kEmpty;
}
// Sets the handle to be empty. IsEmpty() will then return true.
V8_INLINE void Clear() { ptr_ = internal::ValueHelper::kEmpty; }
protected:
friend class internal::ValueHelper;
friend class internal::HandleHelper;
V8_INLINE DirectHandleBase() = default;
V8_INLINE DirectHandleBase(const DirectHandleBase& other) = default;
V8_INLINE DirectHandleBase& operator=(const DirectHandleBase& that) = default;
V8_INLINE explicit DirectHandleBase(internal::Address ptr) : ptr_(ptr) {}
// Returns the address of the referenced object.
V8_INLINE internal::Address ptr() const { return ptr_; }
// Returns the handler's "value" (direct pointer, as direct local support
// is guaranteed to be enabled here).
template <typename T, bool check_null = false>
V8_INLINE T* value() const {
return reinterpret_cast<T*>(ptr_);
}
private:
internal::Address ptr_ = internal::ValueHelper::kEmpty;
};
#endif // V8_ENABLE_DIRECT_LOCAL
} // namespace v8::api_internal
#endif // INCLUDE_V8_HANDLE_BASE_H_
| Name | Type | Size | Permission | Actions |
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| cppgc | Folder | 0755 |
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| libplatform | Folder | 0755 |
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| openssl | Folder | 0755 |
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| uv | Folder | 0755 |
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| common.gypi | File | 26.59 KB | 0644 |
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| config.gypi | File | 32.08 KB | 0644 |
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| js_native_api.h | File | 31.64 KB | 0644 |
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| node.h | File | 67.99 KB | 0644 |
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| node_object_wrap.h | File | 3.78 KB | 0644 |
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| node_version.h | File | 4.14 KB | 0644 |
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| uv.h | File | 71.1 KB | 0644 |
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| v8-array-buffer.h | File | 17.89 KB | 0644 |
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| v8-callbacks.h | File | 16.59 KB | 0644 |
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| v8-container.h | File | 5.82 KB | 0644 |
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| v8-cppgc.h | File | 7.46 KB | 0644 |
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| v8-handle-base.h | File | 4.3 KB | 0644 |
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| v8-initialization.h | File | 10.23 KB | 0644 |
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| v8-local-handle.h | File | 23.6 KB | 0644 |
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| v8-locker.h | File | 3.86 KB | 0644 |
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| v8-object.h | File | 29.55 KB | 0644 |
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| v8-persistent-handle.h | File | 17.81 KB | 0644 |
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| v8-platform.h | File | 47.9 KB | 0644 |
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| v8-primitive-object.h | File | 2.53 KB | 0644 |
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| v8-source-location.h | File | 2.54 KB | 0644 |
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| v8-statistics.h | File | 7.45 KB | 0644 |
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| v8-template.h | File | 50.36 KB | 0644 |
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| v8-traced-handle.h | File | 12.4 KB | 0644 |
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| v8-typed-array.h | File | 11.3 KB | 0644 |
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| v8-unwinder.h | File | 4.64 KB | 0644 |
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| v8-value-serializer.h | File | 10.56 KB | 0644 |
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| v8-value.h | File | 16.71 KB | 0644 |
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| v8-version.h | File | 773 B | 0644 |
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| v8-wasm.h | File | 6 KB | 0644 |
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| v8-weak-callback-info.h | File | 2.41 KB | 0644 |
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| v8.h | File | 3.69 KB | 0644 |
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| v8config.h | File | 32.85 KB | 0644 |
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| zconf.h | File | 16.6 KB | 0644 |
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| zlib.h | File | 95.17 KB | 0644 |
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