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| #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" |
|
|
| #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 kHalfWordShift = sizeof(uint32_t) * CHAR_BIT - 1; |
| #else |
| static constexpr size_t kHalfWordShift = sizeof(uint32_t) * CHAR_BIT; |
| #endif |
| static_assert((static_cast<size_t>(1) << kHalfWordShift) == |
| api_constants::kCagedHeapReservationSize); |
| CPPGC_DCHECK(g_heap_base_); |
| return !(((reinterpret_cast<uintptr_t>(addr1) ^ g_heap_base_) | |
| (reinterpret_cast<uintptr_t>(addr2) ^ g_heap_base_)) >> |
| kHalfWordShift); |
| } |
|
|
| V8_INLINE static uintptr_t GetBase() { return g_heap_base_; } |
|
|
| private: |
| friend class CagedHeap; |
|
|
| static uintptr_t g_heap_base_; |
| }; |
|
|
| } |
| } |
|
|
| #endif |
|
|
| #endif |
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