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// Copyright 2019 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 V8_EXECUTION_ISOLATE_UTILS_INL_H_
#define V8_EXECUTION_ISOLATE_UTILS_INL_H_
#include "src/execution/isolate-utils.h"
#include "src/common/ptr-compr-inl.h"
#include "src/execution/isolate.h"
#include "src/heap/heap-write-barrier-inl.h"
namespace v8 {
namespace internal {
inline const Isolate* GetIsolateForPtrCompr(HeapObject object) {
#ifdef V8_COMPRESS_POINTERS
return Isolate::FromRoot(GetIsolateRoot(object.ptr()));
#else
return nullptr;
#endif // V8_COMPRESS_POINTERS
}
V8_INLINE Heap* GetHeapFromWritableObject(HeapObject object) {
// Avoid using the below GetIsolateFromWritableObject because we want to be
// able to get the heap, but not the isolate, for off-thread objects.
#if defined V8_ENABLE_THIRD_PARTY_HEAP
return Heap::GetIsolateFromWritableObject(object)->heap();
#elif defined V8_COMPRESS_POINTERS
Isolate* isolate = Isolate::FromRoot(GetIsolateRoot(object.ptr()));
DCHECK_NOT_NULL(isolate);
return isolate->heap();
#else
heap_internals::MemoryChunk* chunk =
heap_internals::MemoryChunk::FromHeapObject(object);
return chunk->GetHeap();
#endif // V8_COMPRESS_POINTERS || V8_ENABLE_THIRD_PARTY_HEAP
}
V8_INLINE Isolate* GetIsolateFromWritableObject(HeapObject object) {
// We don't want to allow accessing the isolate off-thread.
DCHECK(!Heap::InOffThreadSpace(object));
#ifdef V8_ENABLE_THIRD_PARTY_HEAP
return Heap::GetIsolateFromWritableObject(object);
#elif defined V8_COMPRESS_POINTERS
Isolate* isolate = Isolate::FromRoot(GetIsolateRoot(object.ptr()));
DCHECK_NOT_NULL(isolate);
return isolate;
#else
return Isolate::FromHeap(GetHeapFromWritableObject(object));
#endif // V8_COMPRESS_POINTERS, V8_ENABLE_THIRD_PARTY_HEAP
}
V8_INLINE bool GetIsolateFromHeapObject(HeapObject object, Isolate** isolate) {
#ifdef V8_ENABLE_THIRD_PARTY_HEAP
*isolate = Heap::GetIsolateFromWritableObject(object);
return true;
#elif defined V8_COMPRESS_POINTERS
*isolate = GetIsolateFromWritableObject(object);
return true;
#else
heap_internals::MemoryChunk* chunk =
heap_internals::MemoryChunk::FromHeapObject(object);
if (chunk->InReadOnlySpace()) {
*isolate = nullptr;
return false;
}
*isolate = Isolate::FromHeap(chunk->GetHeap());
return true;
#endif // V8_COMPRESS_POINTERS, V8_ENABLE_THIRD_PARTY_HEAP
}
} // namespace internal
} // namespace v8
#endif // V8_EXECUTION_ISOLATE_UTILS_INL_H_
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