mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef js_heap_api_h___
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#define js_heap_api_h___
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/* These values are private to the JS engine. */
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namespace js {
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namespace gc {
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/*
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* Page size must be static to support our arena pointer optimizations, so we
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* are forced to support each platform with non-4096 pages as a special case.
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* Note: The freelist supports a maximum arena shift of 15.
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* Note: Do not use JS_CPU_SPARC here, this header is used outside JS.
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*/
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#if (defined(SOLARIS) || defined(__FreeBSD__)) && \
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(defined(__sparc) || defined(__sparcv9) || defined(__ia64))
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const size_t PageShift = 13;
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const size_t ArenaShift = PageShift;
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#elif defined(__powerpc64__)
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const size_t PageShift = 16;
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const size_t ArenaShift = 12;
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#else
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const size_t PageShift = 12;
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const size_t ArenaShift = PageShift;
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#endif
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const size_t PageSize = size_t(1) << PageShift;
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const size_t ArenaSize = size_t(1) << ArenaShift;
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const size_t ArenaMask = ArenaSize - 1;
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const size_t ChunkShift = 20;
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const size_t ChunkSize = size_t(1) << ChunkShift;
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const size_t ChunkMask = ChunkSize - 1;
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} /* namespace gc */
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} /* namespace js */
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namespace JS {
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namespace shadow {
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struct ArenaHeader
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{
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JSCompartment *compartment;
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};
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} /* namespace shadow */
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static inline shadow::ArenaHeader *
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GetGCThingArena(void *thing)
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{
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uintptr_t addr = uintptr_t(thing);
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addr &= ~js::gc::ArenaMask;
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return reinterpret_cast<shadow::ArenaHeader *>(addr);
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}
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static inline JSCompartment *
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GetGCThingCompartment(void *thing)
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{
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JS_ASSERT(thing);
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return GetGCThingArena(thing)->compartment;
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}
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static inline JSCompartment *
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GetObjectCompartment(JSObject *obj)
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{
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return GetGCThingCompartment(obj);
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}
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} /* namespace JS */
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#endif /* js_heap_api_h___ */
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