#define ACCESSORS(holder, name, type, offset) \
type* holder::name() { return type::cast(READ_FIELD(this, offset)); } \
void holder::set_##name(type* value, WriteBarrierMode mode) { \
WRITE_FIELD(this, offset, value); \
CONDITIONAL_WRITE_BARRIER(GetHeap(), this, offset, value, mode); \
}
#define FIELD_ADDR(p, offset) \
(reinterpret_cast<byte*>(p) + offset - kHeapObjectTag)
#define READ_FIELD(p, offset) \
(*reinterpret_cast<Object**>(FIELD_ADDR(p, offset)))
I have two questions.
1. Why does subtract kHeapObjectTag in FIELD_ADDR() ?
2. Why cast to Object**?
Actually, V8 group is very helpful for me to study v8 sources.
Thank you.
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