mirror of
https://gitea.wildfiregames.com/0ad/0ad
synced 2026-06-18 06:13:55 -07:00
43137fef3f
Differential Revision: https://code.wildfiregames.com/D716
Refs 09e974e1cb
Reviewed By: bb
Change in agreement with leper.
This was SVN commit r19899.
136 lines
3.4 KiB
C++
136 lines
3.4 KiB
C++
/* Copyright (C) 2011 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "precompiled.h"
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#include "lib/sysdep/vm.h"
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#include "lib/alignment.h"
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// "anonymous" effectively means mapping /dev/zero, but is more efficient.
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// MAP_ANONYMOUS is not in SUSv3, but is a very common extension.
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// unfortunately, MacOS X only defines MAP_ANON, which Solaris says is
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// deprecated. workaround there: define MAP_ANONYMOUS in terms of MAP_ANON.
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#ifndef MAP_ANONYMOUS
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# define MAP_ANONYMOUS MAP_ANON
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#endif
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static const int mmap_flags = MAP_PRIVATE|MAP_ANONYMOUS;
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namespace vm {
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void* ReserveAddressSpace(size_t size, size_t UNUSED(commitSize), PageType UNUSED(pageType), int UNUSED(prot))
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{
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errno = 0;
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void* p = mmap(0, size, PROT_NONE, mmap_flags|MAP_NORESERVE, -1, 0);
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if(p == MAP_FAILED)
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return 0;
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return p;
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}
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void ReleaseAddressSpace(void* p, size_t size)
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{
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ENSURE(size != 0);
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errno = 0;
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if(munmap(p, size) != 0)
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DEBUG_WARN_ERR(StatusFromErrno());
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}
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bool Commit(uintptr_t address, size_t size, PageType UNUSED(pageType), int prot)
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{
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if(prot == PROT_NONE) // would be understood as a request to decommit
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{
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DEBUG_WARN_ERR(ERR::INVALID_PARAM);
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return false;
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}
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errno = 0;
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if(mmap((void*)address, size, prot, mmap_flags|MAP_FIXED, -1, 0) == MAP_FAILED)
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return false;
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if(prot != (PROT_READ|PROT_WRITE))
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(void)Protect(address, size, prot);
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return true;
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}
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bool Decommit(uintptr_t address, size_t size)
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{
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errno = 0;
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if(mmap((void*)address, size, PROT_NONE, mmap_flags|MAP_NORESERVE|MAP_FIXED, -1, 0) == MAP_FAILED)
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return false;
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return true;
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}
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bool Protect(uintptr_t address, size_t size, int prot)
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{
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errno = 0;
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if(mprotect((void*)address, size, prot) != 0)
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{
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DEBUG_WARN_ERR(ERR::FAIL);
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return false;
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}
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return true;
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}
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void* Allocate(size_t size, PageType pageType, int prot)
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{
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void* p = ReserveAddressSpace(size);
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if(!p)
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return 0;
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if(!Commit(uintptr_t(p), size, pageType, prot))
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{
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ReleaseAddressSpace(p, size);
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return 0;
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}
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return p;
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}
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void Free(void* p, size_t size)
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{
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// (only the Windows implementation distinguishes between Free and ReleaseAddressSpace)
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vm::ReleaseAddressSpace(p, size);
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}
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void BeginOnDemandCommits()
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{
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// not yet implemented, but possible with a signal handler
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}
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void EndOnDemandCommits()
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{
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// not yet implemented, but possible with a signal handler
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}
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void DumpStatistics()
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{
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// we haven't collected any statistics
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}
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} // namespace vm
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