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// Copyright 2022 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_CAGED_HEAP_H_
#define INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_H_
#include <climits>
#include <cstddef>
#include "cppgc/internal/api-constants.h"
#include "cppgc/internal/base-page-handle.h"
#include "v8config.h" // NOLINT(build/include_directory)
#if defined(CPPGC_CAGED_HEAP)
namespace cppgc {
namespace internal {
class V8_EXPORT CagedHeapBase {
public:
V8_INLINE static uintptr_t OffsetFromAddress(const void* address) {
return reinterpret_cast<uintptr_t>(address) &
(api_constants::kCagedHeapReservationAlignment - 1);
}
V8_INLINE static bool IsWithinCage(const void* address) {
CPPGC_DCHECK(g_heap_base_);
return (reinterpret_cast<uintptr_t>(address) &
~(api_constants::kCagedHeapReservationAlignment - 1)) ==
g_heap_base_;
}
V8_INLINE static bool AreWithinCage(const void* addr1, const void* addr2) {
#if defined(CPPGC_2GB_CAGE)
static constexpr size_t kHeapBaseShift = sizeof(uint32_t) * CHAR_BIT - 1;
#else //! defined(CPPGC_2GB_CAGE)
#if defined(CPPGC_POINTER_COMPRESSION)
static constexpr size_t kHeapBaseShift =
31 + api_constants::kPointerCompressionShift;
#else // !defined(CPPGC_POINTER_COMPRESSION)
static constexpr size_t kHeapBaseShift = sizeof(uint32_t) * CHAR_BIT;
#endif // !defined(CPPGC_POINTER_COMPRESSION)
#endif //! defined(CPPGC_2GB_CAGE)
static_assert((static_cast<size_t>(1) << kHeapBaseShift) ==
api_constants::kCagedHeapMaxReservationSize);
CPPGC_DCHECK(g_heap_base_);
return !(((reinterpret_cast<uintptr_t>(addr1) ^ g_heap_base_) |
(reinterpret_cast<uintptr_t>(addr2) ^ g_heap_base_)) >>
kHeapBaseShift);
}
V8_INLINE static uintptr_t GetBase() { return g_heap_base_; }
V8_INLINE static size_t GetAgeTableSize() { return g_age_table_size_; }
private:
friend class CagedHeap;
static uintptr_t g_heap_base_;
static size_t g_age_table_size_;
};
} // namespace internal
} // namespace cppgc
#endif // defined(CPPGC_CAGED_HEAP)
#endif // INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_H_
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| api-constants.h | File | 2.83 KB | 0644 |
|
| atomic-entry-flag.h | File | 1.72 KB | 0644 |
|
| base-page-handle.h | File | 1.44 KB | 0644 |
|
| caged-heap-local-data.h | File | 3.61 KB | 0644 |
|
| caged-heap.h | File | 2.21 KB | 0644 |
|
| compiler-specific.h | File | 1019 B | 0644 |
|
| finalizer-trait.h | File | 2.59 KB | 0644 |
|
| gc-info.h | File | 6.31 KB | 0644 |
|
| logging.h | File | 1.66 KB | 0644 |
|
| member-storage.h | File | 8.7 KB | 0644 |
|
| name-trait.h | File | 4.08 KB | 0644 |
|
| persistent-node.h | File | 5.89 KB | 0644 |
|
| pointer-policies.h | File | 8.34 KB | 0644 |
|
| write-barrier.h | File | 19.09 KB | 0644 |
|