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Sweden-Number/memory/heap.c

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/*
* Win32 heap functions
*
* Copyright 1996 Alexandre Julliard
* Copyright 1998 Ulrich Weigand
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "windows.h"
#include "selectors.h"
#include "global.h"
#include "winbase.h"
#include "winerror.h"
#include "winnt.h"
#include "heap.h"
#include "debug.h"
/* Note: the heap data structures are based on what Pietrek describes in his
* book 'Windows 95 System Programming Secrets'. The layout is not exactly
* the same, but could be easily adapted if it turns out some programs
* require it.
*/
typedef struct tagARENA_INUSE
{
DWORD size; /* Block size; must be the first field */
WORD threadId; /* Allocating thread id */
WORD magic; /* Magic number */
DWORD callerEIP; /* EIP of caller upon allocation */
} ARENA_INUSE;
typedef struct tagARENA_FREE
{
DWORD size; /* Block size; must be the first field */
WORD threadId; /* Freeing thread id */
WORD magic; /* Magic number */
struct tagARENA_FREE *next; /* Next free arena */
struct tagARENA_FREE *prev; /* Prev free arena */
} ARENA_FREE;
#define ARENA_FLAG_FREE 0x00000001 /* flags OR'ed with arena size */
#define ARENA_FLAG_PREV_FREE 0x00000002
#define ARENA_SIZE_MASK 0xfffffffc
#define ARENA_INUSE_MAGIC 0x4842 /* Value for arena 'magic' field */
#define ARENA_FREE_MAGIC 0x4846 /* Value for arena 'magic' field */
#define ARENA_INUSE_FILLER 0x55
#define ARENA_FREE_FILLER 0xaa
#define HEAP_NB_FREE_LISTS 4 /* Number of free lists */
/* Max size of the blocks on the free lists */
static const DWORD HEAP_freeListSizes[HEAP_NB_FREE_LISTS] =
{
0x20, 0x80, 0x200, 0xffffffff
};
typedef struct
{
DWORD size;
ARENA_FREE arena;
} FREE_LIST_ENTRY;
struct tagHEAP;
typedef struct tagSUBHEAP
{
DWORD size; /* Size of the whole sub-heap */
DWORD commitSize; /* Committed size of the sub-heap */
DWORD headerSize; /* Size of the heap header */
struct tagSUBHEAP *next; /* Next sub-heap */
struct tagHEAP *heap; /* Main heap structure */
DWORD magic; /* Magic number */
WORD selector; /* Selector for HEAP_WINE_SEGPTR heaps */
} SUBHEAP;
#define SUBHEAP_MAGIC ((DWORD)('S' | ('U'<<8) | ('B'<<16) | ('H'<<24)))
typedef struct tagHEAP
{
SUBHEAP subheap; /* First sub-heap */
struct tagHEAP *next; /* Next heap for this process */
FREE_LIST_ENTRY freeList[HEAP_NB_FREE_LISTS]; /* Free lists */
CRITICAL_SECTION critSection; /* Critical section for serialization */
DWORD flags; /* Heap flags */
DWORD magic; /* Magic number */
} HEAP;
#define HEAP_MAGIC ((DWORD)('H' | ('E'<<8) | ('A'<<16) | ('P'<<24)))
#define HEAP_DEF_SIZE 0x110000 /* Default heap size = 1Mb + 64Kb */
#define HEAP_MIN_BLOCK_SIZE (8+sizeof(ARENA_FREE)) /* Min. heap block size */
HANDLE32 SystemHeap = 0;
HANDLE32 SegptrHeap = 0;
CRITICAL_SECTION *HEAP_SystemLock = NULL;
/***********************************************************************
* HEAP_Dump
*/
void HEAP_Dump( HEAP *heap )
{
int i;
SUBHEAP *subheap;
char *ptr;
DUMP( "Heap: %08lx\n", (DWORD)heap );
DUMP( "Next: %08lx Sub-heaps: %08lx",
(DWORD)heap->next, (DWORD)&heap->subheap );
subheap = &heap->subheap;
while (subheap->next)
{
DUMP( " -> %08lx", (DWORD)subheap->next );
subheap = subheap->next;
}
DUMP( "\nFree lists:\n Block Stat Size Id\n" );
for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
DUMP( "%08lx free %08lx %04x prev=%08lx next=%08lx\n",
(DWORD)&heap->freeList[i].arena, heap->freeList[i].arena.size,
heap->freeList[i].arena.threadId,
(DWORD)heap->freeList[i].arena.prev,
(DWORD)heap->freeList[i].arena.next );
subheap = &heap->subheap;
while (subheap)
{
DWORD freeSize = 0, usedSize = 0, arenaSize = subheap->headerSize;
DUMP( "\n\nSub-heap %08lx: size=%08lx committed=%08lx\n",
(DWORD)subheap, subheap->size, subheap->commitSize );
DUMP( "\n Block Stat Size Id\n" );
ptr = (char*)subheap + subheap->headerSize;
while (ptr < (char *)subheap + subheap->size)
{
if (*(DWORD *)ptr & ARENA_FLAG_FREE)
{
ARENA_FREE *pArena = (ARENA_FREE *)ptr;
DUMP( "%08lx free %08lx %04x prev=%08lx next=%08lx\n",
(DWORD)pArena, pArena->size & ARENA_SIZE_MASK,
pArena->threadId, (DWORD)pArena->prev,
(DWORD)pArena->next);
ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
arenaSize += sizeof(ARENA_FREE);
freeSize += pArena->size & ARENA_SIZE_MASK;
}
else if (*(DWORD *)ptr & ARENA_FLAG_PREV_FREE)
{
ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
DUMP( "%08lx Used %08lx %04x back=%08lx EIP=%08lx\n",
(DWORD)pArena, pArena->size & ARENA_SIZE_MASK,
pArena->threadId, *((DWORD *)pArena - 1),
pArena->callerEIP );
ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
arenaSize += sizeof(ARENA_INUSE);
usedSize += pArena->size & ARENA_SIZE_MASK;
}
else
{
ARENA_INUSE *pArena = (ARENA_INUSE *)ptr;
DUMP( "%08lx used %08lx %04x EIP=%08lx\n",
(DWORD)pArena, pArena->size & ARENA_SIZE_MASK,
pArena->threadId, pArena->callerEIP );
ptr += sizeof(*pArena) + (pArena->size & ARENA_SIZE_MASK);
arenaSize += sizeof(ARENA_INUSE);
usedSize += pArena->size & ARENA_SIZE_MASK;
}
}
DUMP( "\nTotal: Size=%08lx Committed=%08lx Free=%08lx Used=%08lx Arenas=%08lx (%ld%%)\n\n",
subheap->size, subheap->commitSize, freeSize, usedSize,
arenaSize, (arenaSize * 100) / subheap->size );
subheap = subheap->next;
}
}
/***********************************************************************
* HEAP_GetPtr
* RETURNS
* Pointer to the heap
* NULL: Failure
*/
static HEAP *HEAP_GetPtr(
HANDLE32 heap /* [in] Handle to the heap */
) {
HEAP *heapPtr = (HEAP *)heap;
if (!heapPtr || (heapPtr->magic != HEAP_MAGIC))
{
ERR(heap, "Invalid heap %08x!\n", heap );
SetLastError( ERROR_INVALID_HANDLE );
return NULL;
}
if (TRACE_ON(heap) && !HeapValidate( heap, 0, NULL ))
{
HEAP_Dump( heapPtr );
assert( FALSE );
SetLastError( ERROR_INVALID_HANDLE );
return NULL;
}
return heapPtr;
}
/***********************************************************************
* HEAP_InsertFreeBlock
*
* Insert a free block into the free list.
*/
static void HEAP_InsertFreeBlock( HEAP *heap, ARENA_FREE *pArena )
{
FREE_LIST_ENTRY *pEntry = heap->freeList;
while (pEntry->size < pArena->size) pEntry++;
pArena->size |= ARENA_FLAG_FREE;
pArena->next = pEntry->arena.next;
pArena->next->prev = pArena;
pArena->prev = &pEntry->arena;
pEntry->arena.next = pArena;
}
/***********************************************************************
* HEAP_FindSubHeap
* Find the sub-heap containing a given address.
*
* RETURNS
* Pointer: Success
* NULL: Failure
*/
static SUBHEAP *HEAP_FindSubHeap(
HEAP *heap, /* [in] Heap pointer */
LPCVOID ptr /* [in] Address */
) {
SUBHEAP *sub = &heap->subheap;
while (sub)
{
if (((char *)ptr >= (char *)sub) &&
((char *)ptr < (char *)sub + sub->size)) return sub;
sub = sub->next;
}
return NULL;
}
/***********************************************************************
* HEAP_Commit
*
* Make sure the heap storage is committed up to (not including) ptr.
*/
static BOOL32 HEAP_Commit( SUBHEAP *subheap, void *ptr )
{
DWORD size = (DWORD)((char *)ptr - (char *)subheap);
size = (size + 0xfff) & 0xfffff000; /* Align size on a page boundary */
if (size > subheap->size) size = subheap->size;
if (size <= subheap->commitSize) return TRUE;
if (!VirtualAlloc( (char *)subheap + subheap->commitSize,
size - subheap->commitSize, MEM_COMMIT,
PAGE_EXECUTE_READWRITE))
{
WARN(heap, "Could not commit %08lx bytes at %08lx for heap %08lx\n",
size - subheap->commitSize,
(DWORD)((char *)subheap + subheap->commitSize),
(DWORD)subheap->heap );
return FALSE;
}
subheap->commitSize = size;
return TRUE;
}
/***********************************************************************
* HEAP_Decommit
*
* If possible, decommit the heap storage from (including) 'ptr'.
*/
static BOOL32 HEAP_Decommit( SUBHEAP *subheap, void *ptr )
{
DWORD size = (DWORD)((char *)ptr - (char *)subheap);
size = (size + 0xfff) & 0xfffff000; /* Align size on a page boundary */
if (size >= subheap->commitSize) return TRUE;
if (!VirtualFree( (char *)subheap + size,
subheap->commitSize - size, MEM_DECOMMIT ))
{
WARN(heap, "Could not decommit %08lx bytes at %08lx for heap %08lx\n",
subheap->commitSize - size,
(DWORD)((char *)subheap + size),
(DWORD)subheap->heap );
return FALSE;
}
subheap->commitSize = size;
return TRUE;
}
/***********************************************************************
* HEAP_CreateFreeBlock
*
* Create a free block at a specified address. 'size' is the size of the
* whole block, including the new arena.
*/
static void HEAP_CreateFreeBlock( SUBHEAP *subheap, void *ptr, DWORD size )
{
ARENA_FREE *pFree;
/* Create a free arena */
pFree = (ARENA_FREE *)ptr;
pFree->threadId = GetCurrentTask();
pFree->magic = ARENA_FREE_MAGIC;
/* If debugging, erase the freed block content */
if (TRACE_ON(heap))
{
char *pEnd = (char *)ptr + size;
if (pEnd > (char *)subheap + subheap->commitSize)
pEnd = (char *)subheap + subheap->commitSize;
if (pEnd > (char *)(pFree + 1))
memset( pFree + 1, ARENA_FREE_FILLER, pEnd - (char *)(pFree + 1) );
}
/* Check if next block is free also */
if (((char *)ptr + size < (char *)subheap + subheap->size) &&
(*(DWORD *)((char *)ptr + size) & ARENA_FLAG_FREE))
{
/* Remove the next arena from the free list */
ARENA_FREE *pNext = (ARENA_FREE *)((char *)ptr + size);
pNext->next->prev = pNext->prev;
pNext->prev->next = pNext->next;
size += (pNext->size & ARENA_SIZE_MASK) + sizeof(*pNext);
if (TRACE_ON(heap))
memset( pNext, ARENA_FREE_FILLER, sizeof(ARENA_FREE) );
}
/* Set the next block PREV_FREE flag and pointer */
if ((char *)ptr + size < (char *)subheap + subheap->size)
{
DWORD *pNext = (DWORD *)((char *)ptr + size);
*pNext |= ARENA_FLAG_PREV_FREE;
*(ARENA_FREE **)(pNext - 1) = pFree;
}
/* Last, insert the new block into the free list */
pFree->size = size - sizeof(*pFree);
HEAP_InsertFreeBlock( subheap->heap, pFree );
}
/***********************************************************************
* HEAP_MakeInUseBlockFree
*
* Turn an in-use block into a free block. Can also decommit the end of
* the heap, and possibly even free the sub-heap altogether.
*/
static void HEAP_MakeInUseBlockFree( SUBHEAP *subheap, ARENA_INUSE *pArena )
{
ARENA_FREE *pFree;
DWORD size = (pArena->size & ARENA_SIZE_MASK) + sizeof(*pArena);
/* Check if we can merge with previous block */
if (pArena->size & ARENA_FLAG_PREV_FREE)
{
pFree = *((ARENA_FREE **)pArena - 1);
size += (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
/* Remove it from the free list */
pFree->next->prev = pFree->prev;
pFree->prev->next = pFree->next;
}
else pFree = (ARENA_FREE *)pArena;
/* Create a free block */
HEAP_CreateFreeBlock( subheap, pFree, size );
size = (pFree->size & ARENA_SIZE_MASK) + sizeof(ARENA_FREE);
if ((char *)pFree + size < (char *)subheap + subheap->size)
return; /* Not the last block, so nothing more to do */
/* Free the whole sub-heap if it's empty and not the original one */
if (((char *)pFree == (char *)subheap + subheap->headerSize) &&
(subheap != &subheap->heap->subheap))
{
SUBHEAP *pPrev = &subheap->heap->subheap;
/* Remove the free block from the list */
pFree->next->prev = pFree->prev;
pFree->prev->next = pFree->next;
/* Remove the subheap from the list */
while (pPrev && (pPrev->next != subheap)) pPrev = pPrev->next;
if (pPrev) pPrev->next = subheap->next;
/* Free the memory */
subheap->magic = 0;
if (subheap->selector) FreeSelector( subheap->selector );
VirtualFree( subheap, 0, MEM_RELEASE );
return;
}
/* Decommit the end of the heap */
HEAP_Decommit( subheap, pFree + 1 );
}
/***********************************************************************
* HEAP_ShrinkBlock
*
* Shrink an in-use block.
*/
static void HEAP_ShrinkBlock(SUBHEAP *subheap, ARENA_INUSE *pArena, DWORD size)
{
if ((pArena->size & ARENA_SIZE_MASK) >= size + HEAP_MIN_BLOCK_SIZE)
{
HEAP_CreateFreeBlock( subheap, (char *)(pArena + 1) + size,
(pArena->size & ARENA_SIZE_MASK) - size );
pArena->size = (pArena->size & ~ARENA_SIZE_MASK) | size;
}
else
{
/* Turn off PREV_FREE flag in next block */
char *pNext = (char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK);
if (pNext < (char *)subheap + subheap->size)
*(DWORD *)pNext &= ~ARENA_FLAG_PREV_FREE;
}
}
/***********************************************************************
* HEAP_InitSubHeap
*/
static BOOL32 HEAP_InitSubHeap( HEAP *heap, LPVOID address, DWORD flags,
DWORD commitSize, DWORD totalSize )
{
SUBHEAP *subheap = (SUBHEAP *)address;
WORD selector = 0;
FREE_LIST_ENTRY *pEntry;
int i;
/* Commit memory */
if (!VirtualAlloc(address, commitSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE))
{
WARN(heap, "Could not commit %08lx bytes for sub-heap %08lx\n",
commitSize, (DWORD)address );
return FALSE;
}
/* Allocate a selector if needed */
if (flags & HEAP_WINE_SEGPTR)
{
selector = SELECTOR_AllocBlock( address, totalSize,
(flags & (HEAP_WINE_CODESEG|HEAP_WINE_CODE16SEG))
? SEGMENT_CODE : SEGMENT_DATA,
(flags & HEAP_WINE_CODESEG) != 0, FALSE );
if (!selector)
{
ERR(heap, "Could not allocate selector\n" );
return FALSE;
}
}
/* Fill the sub-heap structure */
subheap->heap = heap;
subheap->selector = selector;
subheap->size = totalSize;
subheap->commitSize = commitSize;
subheap->magic = SUBHEAP_MAGIC;
if ( subheap != (SUBHEAP *)heap )
{
/* If this is a secondary subheap, insert it into list */
subheap->headerSize = sizeof(SUBHEAP);
subheap->next = heap->subheap.next;
heap->subheap.next = subheap;
}
else
{
/* If this is a primary subheap, initialize main heap */
subheap->headerSize = sizeof(HEAP);
subheap->next = NULL;
heap->next = NULL;
heap->flags = flags;
heap->magic = HEAP_MAGIC;
/* Build the free lists */
for (i = 0, pEntry = heap->freeList; i < HEAP_NB_FREE_LISTS; i++, pEntry++)
{
pEntry->size = HEAP_freeListSizes[i];
pEntry->arena.size = 0 | ARENA_FLAG_FREE;
pEntry->arena.next = i < HEAP_NB_FREE_LISTS-1 ?
&heap->freeList[i+1].arena : &heap->freeList[0].arena;
pEntry->arena.prev = i ? &heap->freeList[i-1].arena :
&heap->freeList[HEAP_NB_FREE_LISTS-1].arena;
pEntry->arena.threadId = 0;
pEntry->arena.magic = ARENA_FREE_MAGIC;
}
/* Initialize critical section */
InitializeCriticalSection( &heap->critSection );
if (!SystemHeap) HEAP_SystemLock = &heap->critSection;
}
/* Create the first free block */
HEAP_CreateFreeBlock( subheap, (LPBYTE)subheap + subheap->headerSize,
subheap->size - subheap->headerSize );
return TRUE;
}
/***********************************************************************
* HEAP_CreateSubHeap
*
* Create a sub-heap of the given size.
* If heap == NULL, creates a main heap.
*/
static SUBHEAP *HEAP_CreateSubHeap( HEAP *heap, DWORD flags,
DWORD commitSize, DWORD totalSize )
{
LPVOID address;
/* Round-up sizes on a 64K boundary */
if (flags & HEAP_WINE_SEGPTR)
{
totalSize = commitSize = 0x10000; /* Only 64K at a time for SEGPTRs */
}
else
{
totalSize = (totalSize + 0xffff) & 0xffff0000;
commitSize = (commitSize + 0xffff) & 0xffff0000;
if (!commitSize) commitSize = 0x10000;
if (totalSize < commitSize) totalSize = commitSize;
}
/* Allocate the memory block */
if (!(address = VirtualAlloc( NULL, totalSize,
MEM_RESERVE, PAGE_EXECUTE_READWRITE )))
{
WARN(heap, "Could not VirtualAlloc %08lx bytes\n",
totalSize );
return NULL;
}
/* Initialize subheap */
if (!HEAP_InitSubHeap( heap? heap : (HEAP *)address,
address, flags, commitSize, totalSize ))
{
VirtualFree( address, 0, MEM_RELEASE );
return NULL;
}
return (SUBHEAP *)address;
}
/***********************************************************************
* HEAP_FindFreeBlock
*
* Find a free block at least as large as the requested size, and make sure
* the requested size is committed.
*/
static ARENA_FREE *HEAP_FindFreeBlock( HEAP *heap, DWORD size,
SUBHEAP **ppSubHeap )
{
SUBHEAP *subheap;
ARENA_FREE *pArena;
FREE_LIST_ENTRY *pEntry = heap->freeList;
/* Find a suitable free list, and in it find a block large enough */
while (pEntry->size < size) pEntry++;
pArena = pEntry->arena.next;
while (pArena != &heap->freeList[0].arena)
{
if (pArena->size > size)
{
subheap = HEAP_FindSubHeap( heap, pArena );
if (!HEAP_Commit( subheap, (char *)pArena + sizeof(ARENA_INUSE)
+ size + HEAP_MIN_BLOCK_SIZE))
return NULL;
*ppSubHeap = subheap;
return pArena;
}
pArena = pArena->next;
}
/* If no block was found, attempt to grow the heap */
if (!(heap->flags & HEAP_GROWABLE))
{
WARN(heap, "Not enough space in heap %08lx for %08lx bytes\n",
(DWORD)heap, size );
return NULL;
}
size += sizeof(SUBHEAP) + sizeof(ARENA_FREE);
if (!(subheap = HEAP_CreateSubHeap( heap, heap->flags, size,
MAX( HEAP_DEF_SIZE, size ) )))
return NULL;
TRACE(heap, "created new sub-heap %08lx of %08lx bytes for heap %08lx\n",
(DWORD)subheap, size, (DWORD)heap );
*ppSubHeap = subheap;
return (ARENA_FREE *)(subheap + 1);
}
/***********************************************************************
* HEAP_IsValidArenaPtr
*
* Check that the pointer is inside the range possible for arenas.
*/
static BOOL32 HEAP_IsValidArenaPtr( HEAP *heap, void *ptr )
{
int i;
SUBHEAP *subheap = HEAP_FindSubHeap( heap, ptr );
if (!subheap) return FALSE;
if ((char *)ptr >= (char *)subheap + subheap->headerSize) return TRUE;
if (subheap != &heap->subheap) return FALSE;
for (i = 0; i < HEAP_NB_FREE_LISTS; i++)
if (ptr == (void *)&heap->freeList[i].arena) return TRUE;
return FALSE;
}
/***********************************************************************
* HEAP_ValidateFreeArena
*/
static BOOL32 HEAP_ValidateFreeArena( SUBHEAP *subheap, ARENA_FREE *pArena )
{
char *heapEnd = (char *)subheap + subheap->size;
/* Check magic number */
if (pArena->magic != ARENA_FREE_MAGIC)
{
ERR(heap, "Heap %08lx: invalid free arena magic for %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena );
return FALSE;
}
/* Check size flags */
if (!(pArena->size & ARENA_FLAG_FREE) ||
(pArena->size & ARENA_FLAG_PREV_FREE))
{
ERR(heap, "Heap %08lx: bad flags %lx for free arena %08lx\n",
(DWORD)subheap->heap, pArena->size & ~ARENA_SIZE_MASK, (DWORD)pArena );
}
/* Check arena size */
if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) > heapEnd)
{
ERR(heap, "Heap %08lx: bad size %08lx for free arena %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena->size & ARENA_SIZE_MASK, (DWORD)pArena );
return FALSE;
}
/* Check that next pointer is valid */
if (!HEAP_IsValidArenaPtr( subheap->heap, pArena->next ))
{
ERR(heap, "Heap %08lx: bad next ptr %08lx for arena %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena->next, (DWORD)pArena );
return FALSE;
}
/* Check that next arena is free */
if (!(pArena->next->size & ARENA_FLAG_FREE) ||
(pArena->next->magic != ARENA_FREE_MAGIC))
{
ERR(heap, "Heap %08lx: next arena %08lx invalid for %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena->next, (DWORD)pArena );
return FALSE;
}
/* Check that prev pointer is valid */
if (!HEAP_IsValidArenaPtr( subheap->heap, pArena->prev ))
{
ERR(heap, "Heap %08lx: bad prev ptr %08lx for arena %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena->prev, (DWORD)pArena );
return FALSE;
}
/* Check that prev arena is free */
if (!(pArena->prev->size & ARENA_FLAG_FREE) ||
(pArena->prev->magic != ARENA_FREE_MAGIC))
{
ERR(heap, "Heap %08lx: prev arena %08lx invalid for %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena->prev, (DWORD)pArena );
return FALSE;
}
/* Check that next block has PREV_FREE flag */
if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) < heapEnd)
{
if (!(*(DWORD *)((char *)(pArena + 1) +
(pArena->size & ARENA_SIZE_MASK)) & ARENA_FLAG_PREV_FREE))
{
ERR(heap, "Heap %08lx: free arena %08lx next block has no PREV_FREE flag\n",
(DWORD)subheap->heap, (DWORD)pArena );
return FALSE;
}
/* Check next block back pointer */
if (*((ARENA_FREE **)((char *)(pArena + 1) +
(pArena->size & ARENA_SIZE_MASK)) - 1) != pArena)
{
ERR(heap, "Heap %08lx: arena %08lx has wrong back ptr %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena,
*((DWORD *)((char *)(pArena+1)+ (pArena->size & ARENA_SIZE_MASK)) - 1));
return FALSE;
}
}
return TRUE;
}
/***********************************************************************
* HEAP_ValidateInUseArena
*/
static BOOL32 HEAP_ValidateInUseArena( SUBHEAP *subheap, ARENA_INUSE *pArena )
{
char *heapEnd = (char *)subheap + subheap->size;
/* Check magic number */
if (pArena->magic != ARENA_INUSE_MAGIC)
{
ERR(heap, "Heap %08lx: invalid in-use arena magic for %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena );
return FALSE;
}
/* Check size flags */
if (pArena->size & ARENA_FLAG_FREE)
{
ERR(heap, "Heap %08lx: bad flags %lx for in-use arena %08lx\n",
(DWORD)subheap->heap, pArena->size & ~ARENA_SIZE_MASK, (DWORD)pArena );
}
/* Check arena size */
if ((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) > heapEnd)
{
ERR(heap, "Heap %08lx: bad size %08lx for in-use arena %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena->size & ARENA_SIZE_MASK, (DWORD)pArena );
return FALSE;
}
/* Check next arena PREV_FREE flag */
if (((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK) < heapEnd) &&
(*(DWORD *)((char *)(pArena + 1) + (pArena->size & ARENA_SIZE_MASK)) & ARENA_FLAG_PREV_FREE))
{
ERR(heap, "Heap %08lx: in-use arena %08lx next block has PREV_FREE flag\n",
(DWORD)subheap->heap, (DWORD)pArena );
return FALSE;
}
/* Check prev free arena */
if (pArena->size & ARENA_FLAG_PREV_FREE)
{
ARENA_FREE *pPrev = *((ARENA_FREE **)pArena - 1);
/* Check prev pointer */
if (!HEAP_IsValidArenaPtr( subheap->heap, pPrev ))
{
ERR(heap, "Heap %08lx: bad back ptr %08lx for arena %08lx\n",
(DWORD)subheap->heap, (DWORD)pPrev, (DWORD)pArena );
return FALSE;
}
/* Check that prev arena is free */
if (!(pPrev->size & ARENA_FLAG_FREE) ||
(pPrev->magic != ARENA_FREE_MAGIC))
{
ERR(heap, "Heap %08lx: prev arena %08lx invalid for in-use %08lx\n",
(DWORD)subheap->heap, (DWORD)pPrev, (DWORD)pArena );
return FALSE;
}
/* Check that prev arena is really the previous block */
if ((char *)(pPrev + 1) + (pPrev->size & ARENA_SIZE_MASK) != (char *)pArena)
{
ERR(heap, "Heap %08lx: prev arena %08lx is not prev for in-use %08lx\n",
(DWORD)subheap->heap, (DWORD)pPrev, (DWORD)pArena );
return FALSE;
}
}
return TRUE;
}
/***********************************************************************
* HEAP_IsInsideHeap
* Checks whether the pointer points to a block inside a given heap.
*
* NOTES
* Should this return BOOL32?
*
* RETURNS
* !0: Success
* 0: Failure
*/
int HEAP_IsInsideHeap(
HANDLE32 heap, /* [in] Heap */
DWORD flags, /* [in] Flags */
LPCVOID ptr /* [in] Pointer */
) {
HEAP *heapPtr = HEAP_GetPtr( heap );
SUBHEAP *subheap;
int ret;
/* Validate the parameters */
if (!heapPtr) return 0;
flags |= heapPtr->flags;
if (!(flags & HEAP_NO_SERIALIZE)) HeapLock( heap );
ret = (((subheap = HEAP_FindSubHeap( heapPtr, ptr )) != NULL) &&
(((char *)ptr >= (char *)subheap + subheap->headerSize
+ sizeof(ARENA_INUSE))));
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
return ret;
}
/***********************************************************************
* HEAP_GetSegptr
*
* Transform a linear pointer into a SEGPTR. The pointer must have been
* allocated from a HEAP_WINE_SEGPTR heap.
*/
SEGPTR HEAP_GetSegptr( HANDLE32 heap, DWORD flags, LPCVOID ptr )
{
HEAP *heapPtr = HEAP_GetPtr( heap );
SUBHEAP *subheap;
SEGPTR ret;
/* Validate the parameters */
if (!heapPtr) return 0;
flags |= heapPtr->flags;
if (!(flags & HEAP_WINE_SEGPTR))
{
ERR(heap, "Heap %08x is not a SEGPTR heap\n",
heap );
return 0;
}
if (!(flags & HEAP_NO_SERIALIZE)) HeapLock( heap );
/* Get the subheap */
if (!(subheap = HEAP_FindSubHeap( heapPtr, ptr )))
{
ERR(heap, "%p is not inside heap %08x\n",
ptr, heap );
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
return 0;
}
/* Build the SEGPTR */
ret = PTR_SEG_OFF_TO_SEGPTR(subheap->selector, (DWORD)ptr-(DWORD)subheap);
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
return ret;
}
/***********************************************************************
* HeapCreate (KERNEL32.336)
* RETURNS
* Handle of heap: Success
* NULL: Failure
*/
HANDLE32 WINAPI HeapCreate(
DWORD flags, /* [in] Heap allocation flag */
DWORD initialSize, /* [in] Initial heap size */
DWORD maxSize /* [in] Maximum heap size */
) {
SUBHEAP *subheap;
/* Allocate the heap block */
if (!maxSize)
{
maxSize = HEAP_DEF_SIZE;
flags |= HEAP_GROWABLE;
}
if (!(subheap = HEAP_CreateSubHeap( NULL, flags, initialSize, maxSize )))
{
SetLastError( ERROR_OUTOFMEMORY );
return 0;
}
return (HANDLE32)subheap;
}
/***********************************************************************
* HeapDestroy (KERNEL32.337)
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL32 WINAPI HeapDestroy(
HANDLE32 heap /* [in] Handle of heap */
) {
HEAP *heapPtr = HEAP_GetPtr( heap );
SUBHEAP *subheap;
TRACE(heap, "%08x\n", heap );
if (!heapPtr) return FALSE;
DeleteCriticalSection( &heapPtr->critSection );
subheap = &heapPtr->subheap;
while (subheap)
{
SUBHEAP *next = subheap->next;
if (subheap->selector) FreeSelector( subheap->selector );
VirtualFree( subheap, 0, MEM_RELEASE );
subheap = next;
}
return TRUE;
}
/***********************************************************************
* HeapAlloc (KERNEL32.334)
* RETURNS
* Pointer to allocated memory block
* NULL: Failure
*/
LPVOID WINAPI HeapAlloc(
HANDLE32 heap, /* [in] Handle of private heap block */
DWORD flags, /* [in] Heap allocation control flags */
DWORD size /* [in] Number of bytes to allocate */
) {
ARENA_FREE *pArena;
ARENA_INUSE *pInUse;
SUBHEAP *subheap;
HEAP *heapPtr = HEAP_GetPtr( heap );
/* Validate the parameters */
if (!heapPtr) return NULL;
flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY;
flags |= heapPtr->flags;
if (!(flags & HEAP_NO_SERIALIZE)) HeapLock( heap );
size = (size + 3) & ~3;
if (size < HEAP_MIN_BLOCK_SIZE) size = HEAP_MIN_BLOCK_SIZE;
/* Locate a suitable free block */
if (!(pArena = HEAP_FindFreeBlock( heapPtr, size, &subheap )))
{
TRACE(heap, "(%08x,%08lx,%08lx): returning NULL\n",
heap, flags, size );
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
SetLastError( ERROR_COMMITMENT_LIMIT );
return NULL;
}
/* Remove the arena from the free list */
pArena->next->prev = pArena->prev;
pArena->prev->next = pArena->next;
/* Build the in-use arena */
pInUse = (ARENA_INUSE *)pArena;
pInUse->size = (pInUse->size & ~ARENA_FLAG_FREE)
+ sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
pInUse->callerEIP = *((DWORD *)&heap - 1); /* hack hack */
pInUse->threadId = GetCurrentTask();
pInUse->magic = ARENA_INUSE_MAGIC;
/* Shrink the block */
HEAP_ShrinkBlock( subheap, pInUse, size );
if (flags & HEAP_ZERO_MEMORY) memset( pInUse + 1, 0, size );
else if (TRACE_ON(heap)) memset( pInUse + 1, ARENA_INUSE_FILLER, size );
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
TRACE(heap, "(%08x,%08lx,%08lx): returning %08lx\n",
heap, flags, size, (DWORD)(pInUse + 1) );
return (LPVOID)(pInUse + 1);
}
/***********************************************************************
* HeapFree (KERNEL32.338)
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL32 WINAPI HeapFree(
HANDLE32 heap, /* [in] Handle of heap */
DWORD flags, /* [in] Heap freeing flags */
LPVOID ptr /* [in] Address of memory to free */
) {
ARENA_INUSE *pInUse;
SUBHEAP *subheap;
HEAP *heapPtr = HEAP_GetPtr( heap );
/* Validate the parameters */
if (!heapPtr) return FALSE;
flags &= HEAP_NO_SERIALIZE;
flags |= heapPtr->flags;
if (!(flags & HEAP_NO_SERIALIZE)) HeapLock( heap );
if (!ptr)
{
WARN(heap, "(%08x,%08lx,%08lx): asked to free NULL\n",
heap, flags, (DWORD)ptr );
}
if (!ptr || !HeapValidate( heap, HEAP_NO_SERIALIZE, ptr ))
{
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
SetLastError( ERROR_INVALID_PARAMETER );
TRACE(heap, "(%08x,%08lx,%08lx): returning FALSE\n",
heap, flags, (DWORD)ptr );
return FALSE;
}
/* Turn the block into a free block */
pInUse = (ARENA_INUSE *)ptr - 1;
subheap = HEAP_FindSubHeap( heapPtr, pInUse );
HEAP_MakeInUseBlockFree( subheap, pInUse );
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
/* SetLastError( 0 ); */
TRACE(heap, "(%08x,%08lx,%08lx): returning TRUE\n",
heap, flags, (DWORD)ptr );
return TRUE;
}
/***********************************************************************
* HeapReAlloc (KERNEL32.340)
* RETURNS
* Pointer to reallocated memory block
* NULL: Failure
*/
LPVOID WINAPI HeapReAlloc(
HANDLE32 heap, /* [in] Handle of heap block */
DWORD flags, /* [in] Heap reallocation flags */
LPVOID ptr, /* [in] Address of memory to reallocate */
DWORD size /* [in] Number of bytes to reallocate */
) {
ARENA_INUSE *pArena;
DWORD oldSize;
HEAP *heapPtr;
SUBHEAP *subheap;
if (!ptr) return HeapAlloc( heap, flags, size ); /* FIXME: correct? */
if (!(heapPtr = HEAP_GetPtr( heap ))) return FALSE;
/* Validate the parameters */
flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY |
HEAP_REALLOC_IN_PLACE_ONLY;
flags |= heapPtr->flags;
size = (size + 3) & ~3;
if (size < HEAP_MIN_BLOCK_SIZE) size = HEAP_MIN_BLOCK_SIZE;
if (!(flags & HEAP_NO_SERIALIZE)) HeapLock( heap );
if (!HeapValidate( heap, HEAP_NO_SERIALIZE, ptr ))
{
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
SetLastError( ERROR_INVALID_PARAMETER );
TRACE(heap, "(%08x,%08lx,%08lx,%08lx): returning NULL\n",
heap, flags, (DWORD)ptr, size );
return NULL;
}
/* Check if we need to grow the block */
pArena = (ARENA_INUSE *)ptr - 1;
pArena->threadId = GetCurrentTask();
subheap = HEAP_FindSubHeap( heapPtr, pArena );
oldSize = (pArena->size & ARENA_SIZE_MASK);
if (size > oldSize)
{
char *pNext = (char *)(pArena + 1) + oldSize;
if ((pNext < (char *)subheap + subheap->size) &&
(*(DWORD *)pNext & ARENA_FLAG_FREE) &&
(oldSize + (*(DWORD *)pNext & ARENA_SIZE_MASK) + sizeof(ARENA_FREE) >= size))
{
/* The next block is free and large enough */
ARENA_FREE *pFree = (ARENA_FREE *)pNext;
pFree->next->prev = pFree->prev;
pFree->prev->next = pFree->next;
pArena->size += (pFree->size & ARENA_SIZE_MASK) + sizeof(*pFree);
if (!HEAP_Commit( subheap, (char *)pArena + sizeof(ARENA_INUSE)
+ size + HEAP_MIN_BLOCK_SIZE))
{
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
SetLastError( ERROR_OUTOFMEMORY );
return NULL;
}
HEAP_ShrinkBlock( subheap, pArena, size );
}
else /* Do it the hard way */
{
ARENA_FREE *pNew;
ARENA_INUSE *pInUse;
SUBHEAP *newsubheap;
if ((flags & HEAP_REALLOC_IN_PLACE_ONLY) ||
!(pNew = HEAP_FindFreeBlock( heapPtr, size, &newsubheap )))
{
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
SetLastError( ERROR_OUTOFMEMORY );
return NULL;
}
/* Build the in-use arena */
pNew->next->prev = pNew->prev;
pNew->prev->next = pNew->next;
pInUse = (ARENA_INUSE *)pNew;
pInUse->size = (pInUse->size & ~ARENA_FLAG_FREE)
+ sizeof(ARENA_FREE) - sizeof(ARENA_INUSE);
pInUse->threadId = GetCurrentTask();
pInUse->magic = ARENA_INUSE_MAGIC;
HEAP_ShrinkBlock( newsubheap, pInUse, size );
memcpy( pInUse + 1, pArena + 1, oldSize );
/* Free the previous block */
HEAP_MakeInUseBlockFree( subheap, pArena );
subheap = newsubheap;
pArena = pInUse;
}
}
else HEAP_ShrinkBlock( subheap, pArena, size ); /* Shrink the block */
/* Clear the extra bytes if needed */
if (size > oldSize)
{
if (flags & HEAP_ZERO_MEMORY)
memset( (char *)(pArena + 1) + oldSize, 0,
(pArena->size & ARENA_SIZE_MASK) - oldSize );
else if (TRACE_ON(heap))
memset( (char *)(pArena + 1) + oldSize, ARENA_INUSE_FILLER,
(pArena->size & ARENA_SIZE_MASK) - oldSize );
}
/* Return the new arena */
pArena->callerEIP = *((DWORD *)&heap - 1); /* hack hack */
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
TRACE(heap, "(%08x,%08lx,%08lx,%08lx): returning %08lx\n",
heap, flags, (DWORD)ptr, size, (DWORD)(pArena + 1) );
return (LPVOID)(pArena + 1);
}
/***********************************************************************
* HeapCompact (KERNEL32.335)
*/
DWORD WINAPI HeapCompact( HANDLE32 heap, DWORD flags )
{
return 0;
}
/***********************************************************************
* HeapLock (KERNEL32.339)
* Attempts to acquire the critical section object for a specified heap.
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL32 WINAPI HeapLock(
HANDLE32 heap /* [in] Handle of heap to lock for exclusive access */
) {
HEAP *heapPtr = HEAP_GetPtr( heap );
if (!heapPtr) return FALSE;
EnterCriticalSection( &heapPtr->critSection );
return TRUE;
}
/***********************************************************************
* HeapUnlock (KERNEL32.342)
* Releases ownership of the critical section object.
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL32 WINAPI HeapUnlock(
HANDLE32 heap /* [in] Handle to the heap to unlock */
) {
HEAP *heapPtr = HEAP_GetPtr( heap );
if (!heapPtr) return FALSE;
LeaveCriticalSection( &heapPtr->critSection );
return TRUE;
}
/***********************************************************************
* HeapSize (KERNEL32.341)
* RETURNS
* Size in bytes of allocated memory
* 0: Failure
*/
DWORD WINAPI HeapSize(
HANDLE32 heap, /* [in] Handle of heap */
DWORD flags, /* [in] Heap size control flags */
LPVOID ptr /* [in] Address of memory to return size for */
) {
DWORD ret;
HEAP *heapPtr = HEAP_GetPtr( heap );
if (!heapPtr) return FALSE;
flags &= HEAP_NO_SERIALIZE;
flags |= heapPtr->flags;
if (!(flags & HEAP_NO_SERIALIZE)) HeapLock( heap );
if (!HeapValidate( heap, HEAP_NO_SERIALIZE, ptr ))
{
SetLastError( ERROR_INVALID_PARAMETER );
ret = 0xffffffff;
}
else
{
ARENA_INUSE *pArena = (ARENA_INUSE *)ptr - 1;
ret = pArena->size & ARENA_SIZE_MASK;
}
if (!(flags & HEAP_NO_SERIALIZE)) HeapUnlock( heap );
TRACE(heap, "(%08x,%08lx,%08lx): returning %08lx\n",
heap, flags, (DWORD)ptr, ret );
return ret;
}
/***********************************************************************
* HeapValidate (KERNEL32.343)
* Validates a specified heap.
*
* NOTES
* Flags is ignored.
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL32 WINAPI HeapValidate(
HANDLE32 heap, /* [in] Handle to the heap */
DWORD flags, /* [in] Bit flags that control access during operation */
LPCVOID block /* [in] Optional pointer to memory block to validate */
) {
SUBHEAP *subheap;
HEAP *heapPtr = (HEAP *)(heap);
if (!heapPtr || (heapPtr->magic != HEAP_MAGIC))
{
ERR(heap, "Invalid heap %08x!\n", heap );
return FALSE;
}
if (block)
{
/* Only check this single memory block */
if (!(subheap = HEAP_FindSubHeap( heapPtr, block )) ||
((char *)block < (char *)subheap + subheap->headerSize
+ sizeof(ARENA_INUSE)))
{
ERR(heap, "Heap %08lx: block %08lx is not inside heap\n",
(DWORD)heap, (DWORD)block );
return FALSE;
}
return HEAP_ValidateInUseArena( subheap, (ARENA_INUSE *)block - 1 );
}
subheap = &heapPtr->subheap;
while (subheap)
{
char *ptr = (char *)subheap + subheap->headerSize;
while (ptr < (char *)subheap + subheap->size)
{
if (*(DWORD *)ptr & ARENA_FLAG_FREE)
{
if (!HEAP_ValidateFreeArena( subheap, (ARENA_FREE *)ptr ))
return FALSE;
ptr += sizeof(ARENA_FREE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
}
else
{
if (!HEAP_ValidateInUseArena( subheap, (ARENA_INUSE *)ptr ))
return FALSE;
ptr += sizeof(ARENA_INUSE) + (*(DWORD *)ptr & ARENA_SIZE_MASK);
}
}
subheap = subheap->next;
}
return TRUE;
}
/***********************************************************************
* HeapWalk (KERNEL32.344)
* Enumerates the memory blocks in a specified heap.
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL32 WINAPI HeapWalk(
HANDLE32 heap, /* [in] Handle to heap to enumerate */
LPPROCESS_HEAP_ENTRY *entry /* [out] Pointer to structure of enumeration info */
) {
FIXME(heap, "(%08x): stub.\n", heap );
return FALSE;
}
/***********************************************************************
* HEAP_xalloc
*
* Same as HeapAlloc(), but die on failure.
*/
LPVOID HEAP_xalloc( HANDLE32 heap, DWORD flags, DWORD size )
{
LPVOID p = HeapAlloc( heap, flags, size );
if (!p)
{
MSG("Virtual memory exhausted.\n" );
exit(1);
}
return p;
}
/***********************************************************************
* HEAP_strdupA
*/
LPSTR HEAP_strdupA( HANDLE32 heap, DWORD flags, LPCSTR str )
{
LPSTR p = HEAP_xalloc( heap, flags, strlen(str) + 1 );
strcpy( p, str );
return p;
}
/***********************************************************************
* HEAP_strdupW
*/
LPWSTR HEAP_strdupW( HANDLE32 heap, DWORD flags, LPCWSTR str )
{
INT32 len = lstrlen32W(str) + 1;
LPWSTR p = HEAP_xalloc( heap, flags, len * sizeof(WCHAR) );
lstrcpy32W( p, str );
return p;
}
/***********************************************************************
* HEAP_strdupAtoW
*/
LPWSTR HEAP_strdupAtoW( HANDLE32 heap, DWORD flags, LPCSTR str )
{
LPWSTR ret;
if (!str) return NULL;
ret = HEAP_xalloc( heap, flags, (strlen(str)+1) * sizeof(WCHAR) );
lstrcpyAtoW( ret, str );
return ret;
}
/***********************************************************************
* HEAP_strdupWtoA
*/
LPSTR HEAP_strdupWtoA( HANDLE32 heap, DWORD flags, LPCWSTR str )
{
LPSTR ret;
if (!str) return NULL;
ret = HEAP_xalloc( heap, flags, lstrlen32W(str) + 1 );
lstrcpyWtoA( ret, str );
return ret;
}
/***********************************************************************
* 32-bit local heap functions (Win95; undocumented)
*/
#define HTABLE_SIZE 0x10000
#define HTABLE_PAGESIZE 0x1000
#define HTABLE_NPAGES (HTABLE_SIZE / HTABLE_PAGESIZE)
#pragma pack(1)
typedef struct _LOCAL32HEADER
{
WORD freeListFirst[HTABLE_NPAGES];
WORD freeListSize[HTABLE_NPAGES];
WORD freeListLast[HTABLE_NPAGES];
DWORD selectorTableOffset;
WORD selectorTableSize;
WORD selectorDelta;
DWORD segment;
LPBYTE base;
DWORD limit;
DWORD flags;
DWORD magic;
HANDLE32 heap;
} LOCAL32HEADER;
#pragma pack(4)
#define LOCAL32_MAGIC ((DWORD)('L' | ('H'<<8) | ('3'<<16) | ('2'<<24)))
/***********************************************************************
* Local32Init (KERNEL.208)
*/
HANDLE32 WINAPI Local32Init( WORD segment, DWORD tableSize,
DWORD heapSize, DWORD flags )
{
DWORD totSize, segSize = 0;
LPBYTE base;
LOCAL32HEADER *header;
HEAP *heap;
WORD *selectorTable;
WORD selectorEven, selectorOdd;
int i, nrBlocks;
/* Determine new heap size */
if ( segment )
if ( (segSize = GetSelectorLimit( segment )) == 0 )
return 0;
else
segSize++;
if ( heapSize == -1L )
heapSize = 1024L*1024L; /* FIXME */
heapSize = (heapSize + 0xffff) & 0xffff0000;
segSize = (segSize + 0x0fff) & 0xfffff000;
totSize = segSize + HTABLE_SIZE + heapSize;
/* Allocate memory and initialize heap */
if ( !(base = VirtualAlloc( NULL, totSize, MEM_RESERVE, PAGE_READWRITE )) )
return 0;
if ( !VirtualAlloc( base, segSize + HTABLE_PAGESIZE,
MEM_COMMIT, PAGE_READWRITE ) )
{
VirtualFree( base, 0, MEM_RELEASE );
return 0;
}
heap = (HEAP *)(base + segSize + HTABLE_SIZE);
if ( !HEAP_InitSubHeap( heap, (LPVOID)heap, 0, 0x10000, heapSize ) )
{
VirtualFree( base, 0, MEM_RELEASE );
return 0;
}
/* Set up header and handle table */
header = (LOCAL32HEADER *)(base + segSize);
header->base = base;
header->limit = HTABLE_PAGESIZE-1;
header->flags = 0;
header->magic = LOCAL32_MAGIC;
header->heap = (HANDLE32)heap;
header->freeListFirst[0] = sizeof(LOCAL32HEADER);
header->freeListLast[0] = HTABLE_PAGESIZE - 4;
header->freeListSize[0] = (HTABLE_PAGESIZE - sizeof(LOCAL32HEADER)) / 4;
for (i = header->freeListFirst[0]; i < header->freeListLast[0]; i += 4)
*(DWORD *)((LPBYTE)header + i) = i+4;
header->freeListFirst[1] = 0xffff;
/* Set up selector table */
nrBlocks = (totSize + 0x7fff) >> 15;
selectorTable = (LPWORD) HeapAlloc( header->heap, 0, nrBlocks * 2 );
selectorEven = SELECTOR_AllocBlock( base, totSize,
SEGMENT_DATA, FALSE, FALSE );
selectorOdd = SELECTOR_AllocBlock( base + 0x8000, totSize - 0x8000,
SEGMENT_DATA, FALSE, FALSE );
if ( !selectorTable || !selectorEven || !selectorOdd )
{
if ( selectorTable ) HeapFree( header->heap, 0, selectorTable );
if ( selectorEven ) SELECTOR_FreeBlock( selectorEven, totSize >> 16 );
if ( selectorOdd ) SELECTOR_FreeBlock( selectorOdd, (totSize-0x8000) >> 16 );
HeapDestroy( header->heap );
VirtualFree( base, 0, MEM_RELEASE );
return 0;
}
header->selectorTableOffset = (LPBYTE)selectorTable - header->base;
header->selectorTableSize = nrBlocks * 4; /* ??? Win95 does it this way! */
header->selectorDelta = selectorEven - selectorOdd;
header->segment = segment? segment : selectorEven;
for (i = 0; i < nrBlocks; i++)
selectorTable[i] = (i & 1)? selectorOdd + ((i >> 1) << __AHSHIFT)
: selectorEven + ((i >> 1) << __AHSHIFT);
/* Move old segment */
if ( segment )
{
/* FIXME: This is somewhat ugly and relies on implementation
details about 16-bit global memory handles ... */
LPBYTE oldBase = (LPBYTE)GetSelectorBase( segment );
memcpy( base, oldBase, segSize );
GLOBAL_MoveBlock( segment, base, totSize );
HeapFree( SystemHeap, 0, oldBase );
}
return (HANDLE32)header;
}
/***********************************************************************
* Local32_SearchHandle
*/
static LPDWORD Local32_SearchHandle( LOCAL32HEADER *header, DWORD addr )
{
LPDWORD handle;
for ( handle = (LPDWORD)((LPBYTE)header + sizeof(LOCAL32HEADER));
handle < (LPDWORD)((LPBYTE)header + header->limit);
handle++)
{
if (*handle == addr)
return handle;
}
return NULL;
}
/***********************************************************************
* Local32_ToHandle
*/
static VOID Local32_ToHandle( LOCAL32HEADER *header, INT16 type,
DWORD addr, LPDWORD *handle, LPBYTE *ptr )
{
*handle = NULL;
*ptr = NULL;
switch (type)
{
case -2: /* 16:16 pointer, no handles */
*ptr = PTR_SEG_TO_LIN( addr );
*handle = (LPDWORD)*ptr;
break;
case -1: /* 32-bit offset, no handles */
*ptr = header->base + addr;
*handle = (LPDWORD)*ptr;
break;
case 0: /* handle */
if ( addr >= sizeof(LOCAL32HEADER)
&& addr < header->limit && !(addr & 3)
&& *(LPDWORD)((LPBYTE)header + addr) >= HTABLE_SIZE )
{
*handle = (LPDWORD)((LPBYTE)header + addr);
*ptr = header->base + **handle;
}
break;
case 1: /* 16:16 pointer */
*ptr = PTR_SEG_TO_LIN( addr );
*handle = Local32_SearchHandle( header, *ptr - header->base );
break;
case 2: /* 32-bit offset */
*ptr = header->base + addr;
*handle = Local32_SearchHandle( header, *ptr - header->base );
break;
}
}
/***********************************************************************
* Local32_FromHandle
*/
static VOID Local32_FromHandle( LOCAL32HEADER *header, INT16 type,
DWORD *addr, LPDWORD handle, LPBYTE ptr )
{
switch (type)
{
case -2: /* 16:16 pointer */
case 1:
{
WORD *selTable = (LPWORD)(header->base + header->selectorTableOffset);
DWORD offset = (LPBYTE)ptr - header->base;
*addr = MAKELONG( offset & 0x7fff, selTable[offset >> 15] );
}
break;
case -1: /* 32-bit offset */
case 2:
*addr = ptr - header->base;
break;
case 0: /* handle */
*addr = (LPBYTE)handle - (LPBYTE)header;
break;
}
}
/***********************************************************************
* Local32Alloc (KERNEL.209)
*/
DWORD WINAPI Local32Alloc( HANDLE32 heap, DWORD size, INT16 type, DWORD flags )
{
LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
LPDWORD handle;
LPBYTE ptr;
DWORD addr;
/* Allocate memory */
ptr = HeapAlloc( header->heap,
(flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0, size );
if (!ptr) return 0;
/* Allocate handle if requested */
if (type >= 0)
{
int page, i;
/* Find first page of handle table with free slots */
for (page = 0; page < HTABLE_NPAGES; page++)
if (header->freeListFirst[page] != 0)
break;
if (page == HTABLE_NPAGES)
{
WARN( heap, "Out of handles!\n" );
HeapFree( header->heap, 0, ptr );
return 0;
}
/* If virgin page, initialize it */
if (header->freeListFirst[page] == 0xffff)
{
if ( !VirtualAlloc( (LPBYTE)header + (page << 12),
0x1000, MEM_COMMIT, PAGE_READWRITE ) )
{
WARN( heap, "Cannot grow handle table!\n" );
HeapFree( header->heap, 0, ptr );
return 0;
}
header->limit += HTABLE_PAGESIZE;
header->freeListFirst[page] = 0;
header->freeListLast[page] = HTABLE_PAGESIZE - 4;
header->freeListSize[page] = HTABLE_PAGESIZE / 4;
for (i = 0; i < HTABLE_PAGESIZE; i += 4)
*(DWORD *)((LPBYTE)header + i) = i+4;
if (page < HTABLE_NPAGES-1)
header->freeListFirst[page+1] = 0xffff;
}
/* Allocate handle slot from page */
handle = (LPDWORD)((LPBYTE)header + header->freeListFirst[page]);
if (--header->freeListSize[page] == 0)
header->freeListFirst[page] = header->freeListLast[page] = 0;
else
header->freeListFirst[page] = *handle;
/* Store 32-bit offset in handle slot */
*handle = ptr - header->base;
}
else
{
handle = (LPDWORD)ptr;
header->flags |= 1;
}
/* Convert handle to requested output type */
Local32_FromHandle( header, type, &addr, handle, ptr );
return addr;
}
/***********************************************************************
* Local32ReAlloc (KERNEL.210)
*/
DWORD WINAPI Local32ReAlloc( HANDLE32 heap, DWORD addr, INT16 type,
DWORD size, DWORD flags )
{
LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
LPDWORD handle;
LPBYTE ptr;
if (!addr)
return Local32Alloc( heap, size, type, flags );
/* Retrieve handle and pointer */
Local32_ToHandle( header, type, addr, &handle, &ptr );
if (!handle) return FALSE;
/* Reallocate memory block */
ptr = HeapReAlloc( header->heap,
(flags & LMEM_MOVEABLE)? HEAP_ZERO_MEMORY : 0,
ptr, size );
if (!ptr) return 0;
/* Modify handle */
if (type >= 0)
*handle = ptr - header->base;
else
handle = (LPDWORD)ptr;
/* Convert handle to requested output type */
Local32_FromHandle( header, type, &addr, handle, ptr );
return addr;
}
/***********************************************************************
* Local32Free (KERNEL.211)
*/
BOOL32 WINAPI Local32Free( HANDLE32 heap, DWORD addr, INT16 type )
{
LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
LPDWORD handle;
LPBYTE ptr;
/* Retrieve handle and pointer */
Local32_ToHandle( header, type, addr, &handle, &ptr );
if (!handle) return FALSE;
/* Free handle if necessary */
if (type >= 0)
{
int offset = (LPBYTE)handle - (LPBYTE)header;
int page = offset >> 12;
/* Return handle slot to page free list */
if (header->freeListSize[page]++ == 0)
header->freeListFirst[page] = header->freeListLast[page] = offset;
else
*(LPDWORD)((LPBYTE)header + header->freeListLast[page]) = offset,
header->freeListLast[page] = offset;
*handle = 0;
/* Shrink handle table when possible */
while (page > 0 && header->freeListSize[page] == HTABLE_PAGESIZE / 4)
{
if ( VirtualFree( (LPBYTE)header +
(header->limit & ~(HTABLE_PAGESIZE-1)),
HTABLE_PAGESIZE, MEM_DECOMMIT ) )
break;
header->limit -= HTABLE_PAGESIZE;
header->freeListFirst[page] = 0xffff;
page--;
}
}
/* Free memory */
return HeapFree( header->heap, 0, ptr );
}
/***********************************************************************
* Local32Translate (KERNEL.213)
*/
DWORD WINAPI Local32Translate( HANDLE32 heap, DWORD addr, INT16 type1, INT16 type2 )
{
LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
LPDWORD handle;
LPBYTE ptr;
Local32_ToHandle( header, type1, addr, &handle, &ptr );
if (!handle) return 0;
Local32_FromHandle( header, type2, &addr, handle, ptr );
return addr;
}
/***********************************************************************
* Local32Size (KERNEL.214)
*/
DWORD WINAPI Local32Size( HANDLE32 heap, DWORD addr, INT16 type )
{
LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
LPDWORD handle;
LPBYTE ptr;
Local32_ToHandle( header, type, addr, &handle, &ptr );
if (!handle) return 0;
return HeapSize( header->heap, 0, ptr );
}
/***********************************************************************
* Local32ValidHandle (KERNEL.215)
*/
BOOL32 WINAPI Local32ValidHandle( HANDLE32 heap, WORD addr )
{
LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
LPDWORD handle;
LPBYTE ptr;
Local32_ToHandle( header, 0, addr, &handle, &ptr );
return handle != NULL;
}
/***********************************************************************
* Local32GetSegment (KERNEL.229)
*/
WORD WINAPI Local32GetSegment( HANDLE32 heap )
{
LOCAL32HEADER *header = (LOCAL32HEADER *)heap;
return header->segment;
}
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