897c5618aa
The CL does the following: 1) Globalizes CagedHeap for all HeapBases; 2) Adds the global variable representing the cage base; 3) Changes all write-barriers to use this global variable for value/slot checks; 4) Removes no longer needed functionality introduced in previous CLs. Bug: v8:12231 Change-Id: I281a7b0bf67e349c988486fc2d43ec6d703fd292 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3688050 Commit-Queue: Anton Bikineev <bikineev@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#81027}
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
// Copyright 2022 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_CAGED_HEAP_H_
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#define INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_H_
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#include <climits>
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#include <cstddef>
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#include "cppgc/internal/api-constants.h"
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#include "cppgc/internal/base-page-handle.h"
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#include "v8config.h" // NOLINT(build/include_directory)
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#if defined(CPPGC_CAGED_HEAP)
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namespace cppgc {
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namespace internal {
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class V8_EXPORT CagedHeapBase {
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public:
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V8_INLINE static uintptr_t OffsetFromAddress(const void* address) {
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return reinterpret_cast<uintptr_t>(address) &
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(api_constants::kCagedHeapReservationAlignment - 1);
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}
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V8_INLINE static bool IsWithinCage(const void* address) {
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CPPGC_DCHECK(g_heap_base_);
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return (reinterpret_cast<uintptr_t>(address) &
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~(api_constants::kCagedHeapReservationAlignment - 1)) ==
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g_heap_base_;
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}
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V8_INLINE static bool AreWithinCage(const void* addr1, const void* addr2) {
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static constexpr size_t kHalfWordShift = sizeof(uint32_t) * CHAR_BIT;
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static_assert((static_cast<size_t>(1) << kHalfWordShift) ==
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api_constants::kCagedHeapReservationSize);
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CPPGC_DCHECK(g_heap_base_);
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return !(((reinterpret_cast<uintptr_t>(addr1) ^ g_heap_base_) |
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(reinterpret_cast<uintptr_t>(addr2) ^ g_heap_base_)) >>
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kHalfWordShift);
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}
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V8_INLINE static bool IsWithinNormalPageReservation(void* address) {
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return (reinterpret_cast<uintptr_t>(address) - g_heap_base_) <
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api_constants::kCagedHeapNormalPageReservationSize;
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}
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V8_INLINE static bool IsWithinLargePageReservation(const void* ptr) {
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CPPGC_DCHECK(g_heap_base_);
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auto uptr = reinterpret_cast<uintptr_t>(ptr);
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return (uptr >= g_heap_base_ +
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api_constants::kCagedHeapNormalPageReservationSize) &&
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(uptr < g_heap_base_ + api_constants::kCagedHeapReservationSize);
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}
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V8_INLINE static uintptr_t GetBase() { return g_heap_base_; }
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V8_INLINE static BasePageHandle& LookupPageFromInnerPointer(void* ptr) {
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if (V8_LIKELY(IsWithinNormalPageReservation(ptr)))
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return *BasePageHandle::FromPayload(ptr);
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else
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return LookupLargePageFromInnerPointer(ptr);
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}
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private:
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friend class CagedHeap;
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static BasePageHandle& LookupLargePageFromInnerPointer(void* address);
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static uintptr_t g_heap_base_;
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};
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} // namespace internal
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} // namespace cppgc
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#endif // defined(CPPGC_CAGED_HEAP)
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#endif // INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_H_
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