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//============================================================
//
// winmisc.c - Win32 OSD core miscellaneous functions
//
//============================================================
//
// Copyright Aaron Giles
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or
// without modification, are permitted provided that the
// following conditions are met:
//
// * Redistributions of source code must retain the above
// copyright notice, this list of conditions and the
// following disclaimer.
// * Redistributions in binary form must reproduce the
// above copyright notice, this list of conditions and
// the following disclaimer in the documentation and/or
// other materials provided with the distribution.
// * Neither the name 'MAME' nor the names of its
// contributors may be used to endorse or promote
// products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGE (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
// IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//============================================================
// standard windows headers
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <tchar.h>
// MAME headers
#include "emucore.h"
// MAMEOS headers
#include "winutf8.h"
#include "strconv.h"
//============================================================
// MACROS
//============================================================
// presumed size of a page of memory
#define PAGE_SIZE 4096
// allocations this size and larger get guard pages
#define GUARD_PAGE_THRESH 32
// align allocations to start or end of the page?
#define GUARD_ALIGN_START 0
//============================================================
// osd_malloc
//============================================================
void *osd_malloc(size_t size)
{
#ifndef MALLOC_DEBUG
return HeapAlloc(GetProcessHeap(), 0, size);
#else
// add in space for the base pointer
size += sizeof(size_t);
// small items just come from the heap
void *result;
if (size < GUARD_PAGE_THRESH)
result = HeapAlloc(GetProcessHeap(), 0, size);
// large items get guard pages
else
{
// round the size up to a page boundary
size_t rounded_size = ((size + sizeof(void *) + PAGE_SIZE - 1) / PAGE_SIZE) * PAGE_SIZE;
// reserve that much memory, plus two guard pages
void *page_base = VirtualAlloc(NULL, rounded_size + 2 * PAGE_SIZE, MEM_RESERVE, PAGE_NOACCESS);
if (page_base == NULL)
return NULL;
// now allow access to everything but the first and last pages
page_base = VirtualAlloc(reinterpret_cast<UINT8 *>(page_base) + PAGE_SIZE, rounded_size, MEM_COMMIT, PAGE_READWRITE);
if (page_base == NULL)
return NULL;
// work backwards from the page base to get to the block base
result = GUARD_ALIGN_START ? page_base : (reinterpret_cast<UINT8 *>(page_base) + rounded_size - size);
}
// store the page_base at the start
*reinterpret_cast<size_t *>(result) = size;
return reinterpret_cast<UINT8 *>(result) + sizeof(size_t);
#endif
}
//============================================================
// osd_free
//============================================================
void osd_free(void *ptr)
{
#ifndef MALLOC_DEBUG
HeapFree(GetProcessHeap(), 0, ptr);
#else
size_t size = reinterpret_cast<size_t *>(ptr)[-1];
// small items just get freed
if (size < GUARD_PAGE_THRESH)
HeapFree(GetProcessHeap(), 0, ptr);
// large items need more care
else
{
FPTR page_base = (reinterpret_cast<FPTR>(ptr) - sizeof(size_t)) & ~(PAGE_SIZE - 1);
VirtualFree(reinterpret_cast<void *>(page_base - PAGE_SIZE), 0, MEM_RELEASE);
}
#endif
}
//============================================================
// osd_alloc_executable
//============================================================
void *osd_alloc_executable(size_t size)
{
return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
}
//============================================================
// osd_free_executable
//============================================================
void osd_free_executable(void *ptr, size_t size)
{
VirtualFree(ptr, 0, MEM_RELEASE);
}
//============================================================
// osd_break_into_debugger
//============================================================
void osd_break_into_debugger(const char *message)
{
if (IsDebuggerPresent())
{
win_output_debug_string_utf8(message);
DebugBreak();
}
}
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