1 // Copyright 2019 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_EXECUTION_ISOLATE_UTILS_H_ 6 #define V8_EXECUTION_ISOLATE_UTILS_H_ 7 8 #include "src/common/globals.h" 9 10 namespace v8 { 11 namespace internal { 12 13 // Computes the pointer compression cage base from any read only or writable 14 // heap object. The resulting value is intended to be used only as a hoisted 15 // computation of cage base inside trivial accessors for optimizing value 16 // decompression. When pointer compression is disabled this function always 17 // returns nullptr. 18 V8_INLINE PtrComprCageBase GetPtrComprCageBase(HeapObject object); 19 20 V8_INLINE Heap* GetHeapFromWritableObject(HeapObject object); 21 22 V8_INLINE Isolate* GetIsolateFromWritableObject(HeapObject object); 23 24 // Returns true if it succeeded to obtain isolate from given object. 25 // If it fails then the object is definitely a read-only object but it may also 26 // succeed for read only objects if pointer compression is enabled. 27 V8_INLINE bool GetIsolateFromHeapObject(HeapObject object, Isolate** isolate); 28 29 } // namespace internal 30 } // namespace v8 31 32 #endif // V8_EXECUTION_ISOLATE_UTILS_H_ 33