michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef gc_Memory_h
michael@0: #define gc_Memory_h
michael@0: 
michael@0: #include <stddef.h>
michael@0: 
michael@0: struct JSRuntime;
michael@0: 
michael@0: namespace js {
michael@0: namespace gc {
michael@0: 
michael@0: // Sanity check that our compiled configuration matches the currently running
michael@0: // instance and initialize any runtime data needed for allocation.
michael@0: void
michael@0: InitMemorySubsystem(JSRuntime *rt);
michael@0: 
michael@0: // Allocate or deallocate pages from the system with the given alignment.
michael@0: void *
michael@0: MapAlignedPages(JSRuntime *rt, size_t size, size_t alignment);
michael@0: 
michael@0: void
michael@0: UnmapPages(JSRuntime *rt, void *p, size_t size);
michael@0: 
michael@0: // Tell the OS that the given pages are not in use, so they should not
michael@0: // be written to a paging file. This may be a no-op on some platforms.
michael@0: bool
michael@0: MarkPagesUnused(JSRuntime *rt, void *p, size_t size);
michael@0: 
michael@0: // Undo |MarkPagesUnused|: tell the OS that the given pages are of interest
michael@0: // and should be paged in and out normally. This may be a no-op on some
michael@0: // platforms.
michael@0: bool
michael@0: MarkPagesInUse(JSRuntime *rt, void *p, size_t size);
michael@0: 
michael@0: // Returns #(hard faults) + #(soft faults)
michael@0: size_t
michael@0: GetPageFaultCount();
michael@0: 
michael@0: // Allocate memory mapped content.
michael@0: // The offset must be aligned according to alignment requirement.
michael@0: void *
michael@0: AllocateMappedContent(int fd, size_t offset, size_t length, size_t alignment);
michael@0: 
michael@0: // Deallocate memory mapped content.
michael@0: void
michael@0: DeallocateMappedContent(void *p, size_t length);
michael@0: 
michael@0: } // namespace gc
michael@0: } // namespace js
michael@0: 
michael@0: #endif /* gc_Memory_h */