memory/local.c

   1 /*
   2  * Local heap functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  * Copyright 1996 Huw Davies
   6  */
   7
   8 /*
   9  * Note:
  10  * All local heap functions need the current DS as first parameter
  11  * when called from the emulation library, so they take one more
  12  * parameter than usual.
  13  */
  14
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include "windows.h"
  18 #include "ldt.h"
  19 #include "task.h"
  20 #include "global.h"
  21 #include "heap.h"
  22 #include "instance.h"
  23 #include "local.h"
  24 #include "module.h"
  25 #include "stackframe.h"
  26 #include "toolhelp.h"
  27 #include "debug.h"
  28
  29 /* needed only  for GDI_HeapSel and USER_HeapSel */
  30 #include "gdi.h"
  31 #include "user.h"
  32
  33 typedef struct
  34 {
  35 /* Arena header */
  36     WORD prev;          /* Previous arena | arena type */
  37     WORD next;          /* Next arena */
  38 /* Start of the memory block or free-list info */
  39     WORD size;          /* Size of the free block */
  40     WORD free_prev;     /* Previous free block */
  41     WORD free_next;     /* Next free block */
  42 } LOCALARENA;
  43
  44 #define ARENA_HEADER_SIZE      4
  45 #define ARENA_HEADER( handle) ( ((handle) & ~3) - ARENA_HEADER_SIZE)
  46
  47   /* Arena types (stored in 'prev' field of the arena) */
  48 #define LOCAL_ARENA_FREE       0
  49 #define LOCAL_ARENA_FIXED      1
  50
  51 /* Layout of a handle entry table
  52  *
  53  * WORD                     count of entries
  54  * LOCALHANDLEENTRY[count]  entries
  55  * WORD                     near ptr to next table
  56  */
  57 typedef struct
  58 {
  59     WORD addr;                /* Address of the MOVEABLE block */
  60     BYTE flags;               /* Flags for this block */
  61     BYTE lock;                /* Lock count */
  62 } LOCALHANDLEENTRY;
  63
  64 /*
  65  * We make addr = 4n + 2 and set *((WORD *)addr - 1) = &addr like Windows does
  66  * in case something actually relies on this.
  67  * Note the ARENA_HEADER(addr) still produces the desired result ie. 4n - 4
  68  *
  69  * An unused handle has lock = flags = 0xff. In windows addr is that of next
  70  * free handle, at the moment in wine we set it to 0.
  71  *
  72  * A discarded block's handle has lock = addr = 0 and flags = 0x40
  73  * (LMEM_DISCARDED >> 8)
  74  */
  75
  76 #pragma pack(1)
  77
  78 typedef struct
  79 {
  80     WORD check;                 /* 00 Heap checking flag */
  81     WORD freeze;                /* 02 Heap frozen flag */
  82     WORD items;                 /* 04 Count of items on the heap */
  83     WORD first;                 /* 06 First item of the heap */
  84     WORD pad1;                  /* 08 Always 0 */
  85     WORD last;                  /* 0a Last item of the heap */
  86     WORD pad2;                  /* 0c Always 0 */
  87     BYTE ncompact;              /* 0e Compactions counter */
  88     BYTE dislevel;              /* 0f Discard level */
  89     DWORD distotal;             /* 10 Total bytes discarded */
  90     WORD htable;                /* 14 Pointer to handle table */
  91     WORD hfree;                 /* 16 Pointer to free handle table */
  92     WORD hdelta;                /* 18 Delta to expand the handle table */
  93     WORD expand;                /* 1a Pointer to expand function (unused) */
  94     WORD pstat;                 /* 1c Pointer to status structure (unused) */
  95     FARPROC16 notify WINE_PACKED; /* 1e Pointer to LocalNotify() function */
  96     WORD lock;                  /* 22 Lock count for the heap */
  97     WORD extra;                 /* 24 Extra bytes to allocate when expanding */
  98     WORD minsize;               /* 26 Minimum size of the heap */
  99     WORD magic;                 /* 28 Magic number */
 100 } LOCALHEAPINFO;
 101
 102 #pragma pack(4)
 103
 104 #define LOCAL_HEAP_MAGIC  0x484c  /* 'LH' */
 105
 106
 107   /* All local heap allocations are aligned on 4-byte boundaries */
 108 #define LALIGN(word)          (((word) + 3) & ~3)
 109
 110 #define ARENA_PTR(ptr,arena)       ((LOCALARENA *)((char*)(ptr)+(arena)))
 111 #define ARENA_PREV(ptr,arena)      (ARENA_PTR((ptr),(arena))->prev & ~3)
 112 #define ARENA_NEXT(ptr,arena)      (ARENA_PTR((ptr),(arena))->next)
 113 #define ARENA_FLAGS(ptr,arena)     (ARENA_PTR((ptr),(arena))->prev & 3)
 114
 115   /* determine whether the handle belongs to a fixed or a moveable block */
 116 #define HANDLE_FIXED(handle) (((handle) & 3) == 0)
 117 #define HANDLE_MOVEABLE(handle) (((handle) & 3) == 2)
 118
 119 /***********************************************************************
 120  *           LOCAL_GetHeap
 121  *
 122  * Return a pointer to the local heap, making sure it exists.
 123  */
 124 static LOCALHEAPINFO *LOCAL_GetHeap( HANDLE16 ds )
 125 {
 126     LOCALHEAPINFO *pInfo;
 127     INSTANCEDATA *ptr = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( ds, 0 );
 128     TRACE(local, "Heap at %p, %04x\n", ptr, ptr->heap );
 129     if (!ptr || !ptr->heap) return NULL;
 130     if (IsBadReadPtr16( (SEGPTR)MAKELONG(ptr->heap,ds), sizeof(LOCALHEAPINFO)))
 131         return NULL;
 132     pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
 133     if (pInfo->magic != LOCAL_HEAP_MAGIC) return NULL;
 134     return pInfo;
 135 }
 136
 137
 138 /***********************************************************************
 139  *           LOCAL_MakeBlockFree
 140  *
 141  * Make a block free, inserting it in the free-list.
 142  * 'block' is the handle of the block arena; 'baseptr' points to
 143  * the beginning of the data segment containing the heap.
 144  */
 145 static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
 146 {
 147     LOCALARENA *pArena, *pNext;
 148     WORD next;
 149
 150       /* Mark the block as free */
 151
 152     pArena = ARENA_PTR( baseptr, block );
 153     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
 154     pArena->size = pArena->next - block;
 155
 156       /* Find the next free block (last block is always free) */
 157
 158     next = pArena->next;
 159     for (;;)
 160     {
 161         pNext = ARENA_PTR( baseptr, next );
 162         if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
 163         next = pNext->next;
 164     }
 165
 166     TRACE(local, "Local_MakeBlockFree %04x, next %04x\n", block, next );
 167       /* Insert the free block in the free-list */
 168
 169     pArena->free_prev = pNext->free_prev;
 170     pArena->free_next = next;
 171     ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
 172     pNext->free_prev  = block;
 173 }
 174
 175
 176 /***********************************************************************
 177  *           LOCAL_RemoveFreeBlock
 178  *
 179  * Remove a block from the free-list.
 180  * 'block' is the handle of the block arena; 'baseptr' points to
 181  * the beginning of the data segment containing the heap.
 182  */
 183 static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
 184 {
 185       /* Mark the block as fixed */
 186
 187     LOCALARENA *pArena = ARENA_PTR( baseptr, block );
 188     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
 189
 190       /* Remove it from the list */
 191
 192     ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
 193     ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
 194 }
 195
 196
 197 /***********************************************************************
 198  *           LOCAL_AddBlock
 199  *
 200  * Insert a new block in the heap.
 201  * 'new' is the handle of the new block arena; 'baseptr' points to
 202  * the beginning of the data segment containing the heap; 'prev' is
 203  * the block before the new one.
 204  */
 205 static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
 206 {
 207     LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
 208     LOCALARENA *pNew  = ARENA_PTR( baseptr, new );
 209
 210     pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
 211     pNew->next = pPrev->next;
 212     ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
 213     ARENA_PTR(baseptr,pPrev->next)->prev |= new;
 214     pPrev->next = new;
 215 }
 216
 217
 218 /***********************************************************************
 219  *           LOCAL_RemoveBlock
 220  *
 221  * Remove a block from the heap.
 222  * 'block' is the handle of the block arena; 'baseptr' points to
 223  * the beginning of the data segment containing the heap.
 224  */
 225 static void LOCAL_RemoveBlock( char *baseptr, WORD block )
 226 {
 227     LOCALARENA *pArena, *pTmp;
 228
 229       /* Remove the block from the free-list */
 230
 231     TRACE(local, "Local_RemoveBlock\n");
 232     pArena = ARENA_PTR( baseptr, block );
 233     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 234         LOCAL_RemoveFreeBlock( baseptr, block );
 235
 236       /* If the previous block is free, expand its size */
 237
 238     pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
 239     if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
 240         pTmp->size += pArena->next - block;
 241
 242       /* Remove the block from the linked list */
 243
 244     pTmp->next = pArena->next;
 245     pTmp = ARENA_PTR( baseptr, pArena->next );
 246     pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
 247 }
 248
 249
 250 /***********************************************************************
 251  *           LOCAL_PrintHeap
 252  */
 253 static void LOCAL_PrintHeap( HANDLE16 ds )
 254 {
 255     char *ptr;
 256     LOCALHEAPINFO *pInfo;
 257     WORD arena;
 258
 259     /* FIXME - the test should be done when calling the function!
 260                plus is not clear that we should print this info
 261                only when TRACE_ON is on! */
 262     if(!TRACE_ON(local)) return;
 263
 264     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 265     pInfo = LOCAL_GetHeap( ds );
 266
 267     if (!pInfo)
 268     {
 269         DUMP( "Local Heap corrupted!  ds=%04x\n", ds );
 270         return;
 271     }
 272     DUMP( "Local Heap  ds=%04x first=%04x last=%04x items=%d\n",
 273           ds, pInfo->first, pInfo->last, pInfo->items );
 274
 275     arena = pInfo->first;
 276     for (;;)
 277     {
 278         LOCALARENA *pArena = ARENA_PTR(ptr,arena);
 279         DUMP( "  %04x: prev=%04x next=%04x type=%d\n", arena,
 280               pArena->prev & ~3, pArena->next, pArena->prev & 3 );
 281         if (arena == pInfo->first)
 282         {
 283             DUMP( "        size=%d free_prev=%04x free_next=%04x\n",
 284                   pArena->size, pArena->free_prev, pArena->free_next );
 285         }
 286         if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 287         {
 288             DUMP( "        size=%d free_prev=%04x free_next=%04x\n",
 289                   pArena->size, pArena->free_prev, pArena->free_next );
 290             if (pArena->next == arena) break;  /* last one */
 291             if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
 292             {
 293                 DUMP( "*** arena->free_next->free_prev != arena\n" );
 294                 break;
 295             }
 296         }
 297         if (pArena->next == arena)
 298         {
 299             DUMP( "*** last block is not marked free\n" );
 300             break;
 301         }
 302         if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
 303         {
 304             DUMP( "*** arena->next->prev != arena (%04x, %04x)\n",
 305                   pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
 306             break;
 307         }
 308         arena = pArena->next;
 309     }
 310 }
 311
 312
 313 /***********************************************************************
 314  *           LocalInit   (KERNEL.4)
 315  */
 316 BOOL16 WINAPI LocalInit( HANDLE16 selector, WORD start, WORD end )
 317 {
 318     char *ptr;
 319     WORD heapInfoArena, freeArena, lastArena;
 320     LOCALHEAPINFO *pHeapInfo;
 321     LOCALARENA *pArena, *pFirstArena, *pLastArena;
 322     NE_MODULE *pModule;
 323
 324       /* The initial layout of the heap is: */
 325       /* - first arena         (FIXED)      */
 326       /* - heap info structure (FIXED)      */
 327       /* - large free block    (FREE)       */
 328       /* - last arena          (FREE)       */
 329
 330     TRACE(local, "%04x %04x-%04x\n", selector, start, end);
 331     if (!selector) selector = CURRENT_DS;
 332
 333     if (TRACE_ON(heap))
 334     {
 335         /* If TRACE_ON(heap) is set, the global heap blocks are */
 336         /* cleared before use, so we can test for double initialization. */
 337         if (LOCAL_GetHeap(selector))
 338         {
 339             fprintf( stderr, "LocalInit: Heap %04x initialized twice.\n", selector);
 340             LOCAL_PrintHeap(selector);
 341         }
 342     }
 343
 344     if (start == 0) {
 345       /* Check if the segment is the DGROUP of a module */
 346
 347         if ((pModule = MODULE_GetPtr( selector )))
 348         {
 349             SEGTABLEENTRY *pSeg = NE_SEG_TABLE( pModule ) + pModule->dgroup - 1;
 350             if (pModule->dgroup && (pSeg->selector == selector)) {
 351                 /* We can't just use the simple method of using the value
 352                  * of minsize + stacksize, since there are programs that
 353                  * resize the data segment before calling InitTask(). So,
 354                  * we must put it at the end of the segment */
 355                 start = GlobalSize16( GlobalHandle16( selector ) );
 356                 start -= end;
 357                 end += start;
 358                 TRACE(local," new start %04x, minstart: %04x\n", start, pSeg->minsize + pModule->stack_size);
 359             }
 360         }
 361     }
 362     ptr = PTR_SEG_OFF_TO_LIN( selector, 0 );
 363
 364     start = LALIGN( MAX( start, sizeof(INSTANCEDATA) ) );
 365     heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
 366     freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
 367                         + sizeof(LOCALHEAPINFO) );
 368     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 369
 370       /* Make sure there's enough space.       */
 371
 372     if (freeArena + sizeof(LOCALARENA) >= lastArena) return FALSE;
 373
 374       /* Initialise the first arena */
 375
 376     pFirstArena = ARENA_PTR( ptr, start );
 377     pFirstArena->prev      = start | LOCAL_ARENA_FIXED;
 378     pFirstArena->next      = heapInfoArena;
 379     pFirstArena->size      = LALIGN(sizeof(LOCALARENA));
 380     pFirstArena->free_prev = start;  /* this one */
 381     pFirstArena->free_next = freeArena;
 382
 383       /* Initialise the arena of the heap info structure */
 384
 385     pArena = ARENA_PTR( ptr, heapInfoArena );
 386     pArena->prev = start | LOCAL_ARENA_FIXED;
 387     pArena->next = freeArena;
 388
 389       /* Initialise the heap info structure */
 390
 391     pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
 392     memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
 393     pHeapInfo->items   = 4;
 394     pHeapInfo->first   = start;
 395     pHeapInfo->last    = lastArena;
 396     pHeapInfo->htable  = 0;
 397     pHeapInfo->hdelta  = 0x20;
 398     pHeapInfo->extra   = 0x200;
 399     pHeapInfo->minsize = lastArena - freeArena;
 400     pHeapInfo->magic   = LOCAL_HEAP_MAGIC;
 401
 402       /* Initialise the large free block */
 403
 404     pArena = ARENA_PTR( ptr, freeArena );
 405     pArena->prev      = heapInfoArena | LOCAL_ARENA_FREE;
 406     pArena->next      = lastArena;
 407     pArena->size      = lastArena - freeArena;
 408     pArena->free_prev = start;
 409     pArena->free_next = lastArena;
 410
 411       /* Initialise the last block */
 412
 413     pLastArena = ARENA_PTR( ptr, lastArena );
 414     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 415     pLastArena->next      = lastArena;  /* this one */
 416     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 417     pLastArena->free_prev = freeArena;
 418     pLastArena->free_next = lastArena;  /* this one */
 419
 420       /* Store the local heap address in the instance data */
 421
 422     ((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
 423     LOCAL_PrintHeap( selector );
 424     return TRUE;
 425 }
 426
 427 /***********************************************************************
 428  *           LOCAL_GrowHeap
 429  */
 430 static void LOCAL_GrowHeap( HANDLE16 ds )
 431 {
 432     HANDLE16 hseg = GlobalHandle16( ds );
 433     LONG oldsize = GlobalSize16( hseg );
 434     LONG end;
 435     LOCALHEAPINFO *pHeapInfo;
 436     WORD freeArena, lastArena;
 437     LOCALARENA *pArena, *pLastArena;
 438     char *ptr;
 439
 440     /* if nothing can be gained, return */
 441     if (oldsize > 0xfff0) return;
 442     hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
 443     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 444     pHeapInfo = LOCAL_GetHeap( ds );
 445     if (pHeapInfo == NULL) {
 446         fprintf( stderr, "Local_GrowHeap: heap not found\n" );
 447         return;
 448     }
 449     end = GlobalSize16( hseg );
 450     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 451
 452       /* Update the HeapInfo */
 453     pHeapInfo->items++;
 454     freeArena = pHeapInfo->last;
 455     pHeapInfo->last = lastArena;
 456     pHeapInfo->minsize += end - oldsize;
 457
 458       /* grow the old last block */
 459     pArena = ARENA_PTR( ptr, freeArena );
 460     pArena->size      = lastArena - freeArena;
 461     pArena->next      = lastArena;
 462     pArena->free_next = lastArena;
 463
 464       /* Initialise the new last block */
 465
 466     pLastArena = ARENA_PTR( ptr, lastArena );
 467     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 468     pLastArena->next      = lastArena;  /* this one */
 469     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 470     pLastArena->free_prev = freeArena;
 471     pLastArena->free_next = lastArena;  /* this one */
 472
 473     /* If block before freeArena is also free then merge them */
 474     if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
 475     {
 476         LOCAL_RemoveBlock(ptr, freeArena);
 477         pHeapInfo->items--;
 478     }
 479
 480     TRACE(local, "Heap expanded\n" );
 481     LOCAL_PrintHeap( ds );
 482 }
 483
 484
 485 /***********************************************************************
 486  *           LOCAL_FreeArena
 487  */
 488 static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
 489 {
 490     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 491     LOCALHEAPINFO *pInfo;
 492     LOCALARENA *pArena, *pPrev, *pNext;
 493
 494     TRACE(local, "%04x ds=%04x\n", arena, ds );
 495     if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
 496
 497     pArena = ARENA_PTR( ptr, arena );
 498     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 499     {
 500         /* shouldn't happen */
 501         fprintf( stderr, "LocalFreeArena: Trying to free block %04x twice!\n",
 502                  arena );
 503         LOCAL_PrintHeap( ds );
 504         return arena;
 505     }
 506
 507       /* Check if we can merge with the previous block */
 508
 509     pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
 510     pNext = ARENA_PTR( ptr, pArena->next );
 511     if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
 512     {
 513         arena  = pArena->prev & ~3;
 514         pArena = pPrev;
 515         LOCAL_RemoveBlock( ptr, pPrev->next );
 516         pInfo->items--;
 517     }
 518     else  /* Make a new free block */
 519     {
 520         LOCAL_MakeBlockFree( ptr, arena );
 521     }
 522
 523       /* Check if we can merge with the next block */
 524
 525     if ((pArena->next == pArena->free_next) &&
 526         (pArena->next != pInfo->last))
 527     {
 528         LOCAL_RemoveBlock( ptr, pArena->next );
 529         pInfo->items--;
 530     }
 531     return 0;
 532 }
 533
 534
 535 /***********************************************************************
 536  *           LOCAL_ShrinkArena
 537  *
 538  * Shrink an arena by creating a free block at its end if possible.
 539  * 'size' includes the arena header, and must be aligned.
 540  */
 541 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
 542 {
 543     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 544     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 545
 546     if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
 547     {
 548         LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
 549         if (!pInfo) return;
 550         LOCAL_AddBlock( ptr, arena, arena + size );
 551         pInfo->items++;
 552         LOCAL_FreeArena( ds, arena + size );
 553     }
 554 }
 555
 556
 557 /***********************************************************************
 558  *           LOCAL_GrowArenaDownward
 559  *
 560  * Grow an arena downward by using the previous arena (must be free).
 561  */
 562 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
 563 {
 564     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 565     LOCALHEAPINFO *pInfo;
 566     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 567     WORD prevArena = pArena->prev & ~3;
 568     LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
 569     WORD offset, size;
 570     char *p;
 571
 572     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 573     offset = pPrevArena->size;
 574     size = pArena->next - arena - ARENA_HEADER_SIZE;
 575     LOCAL_RemoveFreeBlock( ptr, prevArena );
 576     LOCAL_RemoveBlock( ptr, arena );
 577     pInfo->items--;
 578     p = (char *)pPrevArena + ARENA_HEADER_SIZE;
 579     while (offset < size)
 580     {
 581         memcpy( p, p + offset, offset );
 582         p += offset;
 583         size -= offset;
 584     }
 585     if (size) memcpy( p, p + offset, size );
 586     LOCAL_ShrinkArena( ds, prevArena, newsize );
 587 }
 588
 589
 590
 591 /***********************************************************************
 592  *           LOCAL_GrowArenaUpward
 593  *
 594  * Grow an arena upward by using the next arena (must be free and big
 595  * enough). Newsize includes the arena header and must be aligned.
 596  */
 597 static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
 598 {
 599     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 600     LOCALHEAPINFO *pInfo;
 601     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 602     WORD nextArena = pArena->next;
 603
 604     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 605     LOCAL_RemoveBlock( ptr, nextArena );
 606     pInfo->items--;
 607     LOCAL_ShrinkArena( ds, arena, newsize );
 608 }
 609
 610
 611 /***********************************************************************
 612  *           LOCAL_GetFreeSpace
 613  */
 614 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
 615 {
 616     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 617     LOCALHEAPINFO *pInfo;
 618     LOCALARENA *pArena;
 619     WORD arena;
 620     WORD freespace = 0;
 621
 622     if (!(pInfo = LOCAL_GetHeap( ds )))
 623     {
 624         fprintf( stderr, "LOCAL_GetFreeSpace: Local heap not found\n" );
 625         LOCAL_PrintHeap(ds);
 626         return 0;
 627     }
 628     arena = pInfo->first;
 629     pArena = ARENA_PTR( ptr, arena );
 630     while (arena != pArena->free_next)
 631     {
 632         arena = pArena->free_next;
 633         pArena = ARENA_PTR( ptr, arena );
 634         if (pArena->size >= freespace) freespace = pArena->size;
 635     }
 636     /* FIXME doesn't yet calculate space that would become free if everything
 637        were discarded when countdiscard == 1 */
 638     if (freespace < ARENA_HEADER_SIZE) freespace = 0;
 639     else freespace -= ARENA_HEADER_SIZE;
 640     return freespace;
 641 }
 642
 643
 644 /***********************************************************************
 645  *           LOCAL_Compact
 646  */
 647 WORD LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
 648 {
 649     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 650     LOCALHEAPINFO *pInfo;
 651     LOCALARENA *pArena, *pMoveArena, *pFinalArena;
 652     WORD arena, movearena, finalarena, table;
 653     WORD count, movesize, size;
 654     WORD freespace;
 655     LOCALHANDLEENTRY *pEntry;
 656
 657     if (!(pInfo = LOCAL_GetHeap( ds )))
 658     {
 659         fprintf( stderr, "Local_Compact: Local heap not found\n" );
 660         LOCAL_PrintHeap(ds);
 661         return 0;
 662     }
 663     TRACE(local, "ds = %04x, minfree = %04x, flags = %04x\n",
 664                  ds, minfree, flags);
 665     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 666     if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
 667     {
 668         TRACE(local, "Returning %04x.\n", freespace);
 669         return freespace;
 670     }
 671     TRACE(local, "Compacting heap %04x.\n", ds);
 672     table = pInfo->htable;
 673     while(table)
 674     {
 675         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 676         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 677         {
 678             if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
 679             {
 680                 /* OK we can move this one if we want */
 681                 TRACE(local, "handle %04x (block %04x) can be moved.\n",
 682                              (WORD)((char *)pEntry - ptr), pEntry->addr);
 683                 movearena = ARENA_HEADER(pEntry->addr);
 684                 pMoveArena = ARENA_PTR(ptr, movearena);
 685                 movesize = pMoveArena->next - movearena;
 686                 arena = pInfo->first;
 687                 pArena = ARENA_PTR(ptr, arena);
 688                 size = 0xffff;
 689                 finalarena = 0;
 690                 /* Try to find the smallest arena that will do, */
 691                 /* which is below us in memory */
 692                 for(;;)
 693                 {
 694                     arena = pArena->free_next;
 695                     pArena = ARENA_PTR(ptr, arena);
 696                     if(arena >= movearena)
 697                         break;
 698                     if(arena == pArena->free_next)
 699                         break;
 700                     if((pArena->size >= movesize) && (pArena->size < size))
 701                     {
 702                         size = pArena->size;
 703                         finalarena = arena;
 704                     }
 705                 }
 706                 if (finalarena) /* Actually got somewhere to move */
 707                 {
 708                     TRACE(local, "Moving it to %04x.\n", finalarena);
 709                     pFinalArena = ARENA_PTR(ptr, finalarena);
 710                     size = pFinalArena->size;
 711                     LOCAL_RemoveFreeBlock(ptr, finalarena);
 712                     LOCAL_ShrinkArena( ds, finalarena, movesize );
 713                     /* Copy the arena to it's new location */
 714                     memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
 715                            (char *)pMoveArena + ARENA_HEADER_SIZE,
 716                            movesize - ARENA_HEADER_SIZE );
 717                     /* Free the old location */
 718                     LOCAL_FreeArena(ds, movearena);
 719                     /* Update handle table entry */
 720                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 721                 }
 722                 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
 723                                == LOCAL_ARENA_FREE)
 724                 {
 725                     /* Previous arena is free (but < movesize)  */
 726                     /* so we can 'slide' movearena down into it */
 727                     finalarena = pMoveArena->prev & ~3;
 728                     LOCAL_GrowArenaDownward( ds, movearena, movesize );
 729                     /* Update handle table entry */
 730                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 731                 }
 732             }
 733         }
 734         table = *(WORD *)pEntry;
 735     }
 736     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 737     if(freespace >= minfree || (flags & LMEM_NODISCARD))
 738     {
 739         TRACE(local, "Returning %04x.\n", freespace);
 740         return freespace;
 741     }
 742
 743     table = pInfo->htable;
 744     while(table)
 745     {
 746         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 747         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 748         {
 749             if(pEntry->addr && pEntry->lock == 0 &&
 750              (pEntry->flags & (LMEM_DISCARDABLE >> 8)))
 751             {
 752                 TRACE(local, "Discarding handle %04x (block %04x).\n",
 753                               (char *)pEntry - ptr, pEntry->addr);
 754                 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
 755                 pEntry->addr = 0;
 756                 pEntry->flags = (LMEM_DISCARDED >> 8);
 757                 /* Call localnotify proc */
 758             }
 759         }
 760         table = *(WORD *)pEntry;
 761     }
 762     return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
 763 }
 764
 765
 766 /***********************************************************************
 767  *           LOCAL_FindFreeBlock
 768  */
 769 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
 770 {
 771     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 772     LOCALHEAPINFO *pInfo;
 773     LOCALARENA *pArena;
 774     WORD arena;
 775
 776     if (!(pInfo = LOCAL_GetHeap( ds )))
 777     {
 778         fprintf( stderr, "Local_FindFreeBlock: Local heap not found\n" );
 779         LOCAL_PrintHeap(ds);
 780         return 0;
 781     }
 782
 783     arena = pInfo->first;
 784     pArena = ARENA_PTR( ptr, arena );
 785     for (;;) {
 786         arena = pArena->free_next;
 787         pArena = ARENA_PTR( ptr, arena );
 788         if (arena == pArena->free_next) break;
 789         if (pArena->size >= size) return arena;
 790     }
 791     WARN(local, "not enough space\n" );
 792     LOCAL_PrintHeap(ds);
 793     return 0;
 794 }
 795
 796 /***********************************************************************
 797  *           LOCAL_GetBlock
 798  * The segment may get moved around in this function, so all callers
 799  * should reset their pointer variables.
 800  */
 801 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
 802 {
 803     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 804     LOCALHEAPINFO *pInfo;
 805     LOCALARENA *pArena;
 806     WORD arena;
 807
 808     if (!(pInfo = LOCAL_GetHeap( ds )))
 809     {
 810         fprintf( stderr, "Local_GetBlock: Local heap not found\n");
 811         LOCAL_PrintHeap(ds);
 812         return 0;
 813     }
 814
 815     size += ARENA_HEADER_SIZE;
 816     size = LALIGN( MAX( size, sizeof(LOCALARENA) ) );
 817
 818       /* Find a suitable free block */
 819     arena = LOCAL_FindFreeBlock( ds, size );
 820     if (arena == 0) {
 821         /* no space: try to make some */
 822         LOCAL_Compact( ds, size, flags );
 823         arena = LOCAL_FindFreeBlock( ds, size );
 824     }
 825     if (arena == 0) {
 826         /* still no space: try to grow the segment */
 827         LOCAL_GrowHeap( ds );
 828         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 829         pInfo = LOCAL_GetHeap( ds );
 830         arena = LOCAL_FindFreeBlock( ds, size );
 831     }
 832     if (arena == 0) {
 833         if (ds == GDI_HeapSel) {
 834             WARN(local, "not enough space in GDI local heap "
 835                          "(%04x) for %d bytes\n", ds, size );
 836         } else if (ds == USER_HeapSel) {
 837             WARN(local, "not enough space in USER local heap "
 838                          "(%04x) for %d bytes\n", ds, size );
 839         } else {
 840             WARN(local, "not enough space in local heap "
 841                          "%04x for %d bytes\n", ds, size );
 842         }
 843         return 0;
 844     }
 845
 846       /* Make a block out of the free arena */
 847     pArena = ARENA_PTR( ptr, arena );
 848     TRACE(local, "LOCAL_GetBlock size = %04x, arena %04x size %04x\n",
 849                   size, arena, pArena->size );
 850     LOCAL_RemoveFreeBlock( ptr, arena );
 851     LOCAL_ShrinkArena( ds, arena, size );
 852
 853     if (flags & LMEM_ZEROINIT)
 854         memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
 855     return arena + ARENA_HEADER_SIZE;
 856 }
 857
 858
 859 /***********************************************************************
 860  *           LOCAL_NewHTable
 861  */
 862 static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
 863 {
 864     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 865     LOCALHEAPINFO *pInfo;
 866     LOCALHANDLEENTRY *pEntry;
 867     HLOCAL16 handle;
 868     int i;
 869
 870     TRACE(local, "Local_NewHTable\n" );
 871     if (!(pInfo = LOCAL_GetHeap( ds )))
 872     {
 873         fprintf( stderr, "Local heap not found\n");
 874         LOCAL_PrintHeap(ds);
 875         return FALSE;
 876     }
 877
 878     if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
 879                                    + 2 * sizeof(WORD), LMEM_FIXED )))
 880         return FALSE;
 881     if (!(ptr = PTR_SEG_OFF_TO_LIN( ds, 0 )))
 882         fprintf(stderr, "LOCAL_NewHTable: ptr == NULL after GetBlock.\n");
 883     if (!(pInfo = LOCAL_GetHeap( ds )))
 884         fprintf(stderr,"LOCAL_NewHTable: pInfo == NULL after GetBlock.\n");
 885
 886     /* Fill the entry table */
 887
 888     *(WORD *)(ptr + handle) = pInfo->hdelta;
 889     pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
 890     for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
 891         pEntry->lock = pEntry->flags = 0xff;
 892         pEntry->addr = 0;
 893     }
 894     *(WORD *)pEntry = pInfo->htable;
 895     pInfo->htable = handle;
 896     return TRUE;
 897 }
 898
 899
 900 /***********************************************************************
 901  *           LOCAL_GetNewHandleEntry
 902  */
 903 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
 904 {
 905     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 906     LOCALHEAPINFO *pInfo;
 907     LOCALHANDLEENTRY *pEntry = NULL;
 908     WORD table;
 909
 910     if (!(pInfo = LOCAL_GetHeap( ds )))
 911     {
 912         fprintf( stderr, "LOCAL_GetNewHandleEntry: Local heap not found\n");
 913         LOCAL_PrintHeap(ds);
 914         return 0;
 915     }
 916
 917     /* Find a free slot in existing tables */
 918
 919     table = pInfo->htable;
 920     while (table)
 921     {
 922         WORD count = *(WORD *)(ptr + table);
 923         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 924         for (; count > 0; count--, pEntry++)
 925             if (pEntry->lock == 0xff) break;
 926         if (count) break;
 927         table = *(WORD *)pEntry;
 928     }
 929
 930     if (!table)  /* We need to create a new table */
 931     {
 932         if (!LOCAL_NewHTable( ds )) return 0;
 933         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 934         pInfo = LOCAL_GetHeap( ds );
 935         pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
 936     }
 937
 938     /* Now allocate this entry */
 939
 940     pEntry->lock = 0;
 941     pEntry->flags = 0;
 942     TRACE(local, "(%04x): %04x\n",
 943                    ds, ((char *)pEntry - ptr) );
 944     return (HLOCAL16)((char *)pEntry - ptr);
 945 }
 946
 947
 948 /***********************************************************************
 949  *           LOCAL_FreeHandleEntry
 950  *
 951  * Free a handle table entry.
 952  */
 953 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
 954 {
 955     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 956     LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
 957     LOCALHEAPINFO *pInfo;
 958     WORD *pTable;
 959     WORD table, count, i;
 960
 961     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 962
 963     /* Find the table where this handle comes from */
 964
 965     pTable = &pInfo->htable;
 966     while (*pTable)
 967     {
 968         WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
 969         if ((handle >= *pTable + sizeof(WORD)) &&
 970             (handle < *pTable + sizeof(WORD) + size)) break;  /* Found it */
 971         pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
 972     }
 973     if (!*pTable)
 974     {
 975         fprintf(stderr, "LOCAL_FreeHandleEntry: invalid entry %04x\n", handle);
 976         LOCAL_PrintHeap( ds );
 977         return;
 978     }
 979
 980     /* Make the entry free */
 981
 982     pEntry->addr = 0;  /* just in case */
 983     pEntry->lock = 0xff;
 984     pEntry->flags = 0xff;
 985     /* Now check if all entries in this table are free */
 986
 987     table = *pTable;
 988     pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 989     count = *(WORD *)(ptr + table);
 990     for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
 991
 992     /* Remove the table from the linked list and free it */
 993
 994     TRACE(local, "(%04x): freeing table %04x\n",
 995                    ds, table);
 996     *pTable = *(WORD *)pEntry;
 997     LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
 998 }
 999
1000
1001 /***********************************************************************
1002  *           LOCAL_Free
1003  *
1004  * Implementation of LocalFree().
1005  */
1006 HLOCAL16 LOCAL_Free( HANDLE16 ds, HLOCAL16 handle )
1007 {
1008     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1009
1010     TRACE(local, "%04x ds=%04x\n", handle, ds );
1011
1012     if (!handle) { fprintf( stderr, "LOCAL_Free: handle is 0.\n" ); return 0; }
1013     if (HANDLE_FIXED( handle ))
1014     {
1015         if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0;  /* OK */
1016         else return handle;  /* couldn't free it */
1017     }
1018     else
1019     {
1020         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1021         if (pEntry->flags != (LMEM_DISCARDED >> 8))
1022         {
1023             TRACE(local, "real block at %04x\n",
1024                            pEntry->addr );
1025             if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr) ))
1026                 return handle; /* couldn't free it */
1027         }
1028         LOCAL_FreeHandleEntry( ds, handle );
1029         return 0;  /* OK */
1030     }
1031 }
1032
1033
1034 /***********************************************************************
1035  *           LOCAL_Alloc
1036  *
1037  * Implementation of LocalAlloc().
1038  *
1039  */
1040 HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD flags, WORD size )
1041 {
1042     char *ptr;
1043     HLOCAL16 handle;
1044
1045     TRACE(local, "%04x %d ds=%04x\n", flags, size, ds );
1046
1047     if(size > 0 && size <= 4) size = 5;
1048     if (flags & LMEM_MOVEABLE)
1049     {
1050         LOCALHANDLEENTRY *plhe;
1051         HLOCAL16 hmem;
1052
1053         if(size)
1054         {
1055             if (!(hmem = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags )))
1056                 return 0;
1057         }
1058         else /* We just need to allocate a discarded handle */
1059             hmem = 0;
1060         if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1061         {
1062             fprintf( stderr, "LocalAlloc: couldn't get handle\n");
1063             if(hmem)
1064                 LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1065             return 0;
1066         }
1067         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1068         plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1069         plhe->lock = 0;
1070         if(hmem)
1071         {
1072             plhe->addr = hmem + sizeof(HLOCAL16);
1073             plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
1074             *(HLOCAL16 *)(ptr + hmem) = handle;
1075         }
1076         else
1077         {
1078             plhe->addr = 0;
1079             plhe->flags = LMEM_DISCARDED >> 8;
1080         }
1081     }
1082     else /* FIXED */
1083     {
1084         if(!size)
1085             return 0;
1086         handle = LOCAL_GetBlock( ds, size, flags );
1087     }
1088     return handle;
1089 }
1090
1091
1092 /***********************************************************************
1093  *           LOCAL_ReAlloc
1094  *
1095  * Implementation of LocalReAlloc().
1096  */
1097 HLOCAL16 LOCAL_ReAlloc( HANDLE16 ds, HLOCAL16 handle, WORD size, WORD flags )
1098 {
1099     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1100     LOCALHEAPINFO *pInfo;
1101     LOCALARENA *pArena, *pNext;
1102     LOCALHANDLEENTRY *pEntry;
1103     WORD arena, oldsize;
1104     HLOCAL16 hmem, blockhandle;
1105     LONG nextarena;
1106
1107     if (!handle) return 0;
1108     if(HANDLE_MOVEABLE(handle) &&
1109      ((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
1110         return 0;
1111
1112     TRACE(local, "%04x %d %04x ds=%04x\n",
1113                    handle, size, flags, ds );
1114     if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1115
1116     if (HANDLE_FIXED( handle ))
1117         blockhandle = handle;
1118     else
1119     {
1120         pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1121         if(pEntry->flags == (LMEM_DISCARDED >> 8))
1122         {
1123             HLOCAL16 hl;
1124             if(pEntry->addr)
1125                 fprintf(stderr,
1126                         "LOCAL_ReAlloc: Dicarded block has non-zero addr.\n");
1127             TRACE(local, "ReAllocating discarded block\n");
1128             if(size <= 4) size = 5;
1129             if (!(hl = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags)))
1130                 return 0;
1131             ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1132             pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1133             pEntry->addr = hl + sizeof(HLOCAL16);
1134             pEntry->flags = 0;
1135             pEntry->lock = 0;
1136             *(HLOCAL16 *)(ptr + hl) = handle;
1137             return handle;
1138         }
1139         if (((blockhandle = pEntry->addr) & 3) != 2)
1140         {
1141             fprintf( stderr, "Local_ReAlloc(%04x,%04x): invalid handle\n",
1142                      ds, handle );
1143             return 0;
1144         }
1145         if(*((HLOCAL16 *)(ptr + blockhandle) - 1) != handle) {
1146             fprintf(stderr, "Local_ReAlloc: Back ptr to handle is invalid\n");
1147             return 0;
1148         }
1149     }
1150
1151     if (flags & LMEM_MODIFY)
1152     {
1153         if (HANDLE_MOVEABLE(handle))
1154         {
1155             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1156             pEntry->flags = (flags & 0x0f00) >> 8;
1157             TRACE(local, "Changing flags to %x.\n", pEntry->flags);
1158         }
1159         return handle;
1160     }
1161
1162     if (!size)
1163     {
1164         if (flags & LMEM_MOVEABLE)
1165         {
1166             if (HANDLE_FIXED(handle))
1167             {
1168                 TRACE(local, "Freeing fixed block.\n");
1169                 return LOCAL_Free( ds, handle );
1170             }
1171             else /* Moveable block */
1172             {
1173                 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1174                 if (pEntry->lock == 0)
1175                 {
1176                     /* discards moveable blocks */
1177                     TRACE(local,"Discarding block\n");
1178                     LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
1179                     pEntry->addr = 0;
1180                     pEntry->flags = (LMEM_DISCARDED >> 8);
1181                     return handle;
1182                 }
1183             }
1184             return 0;
1185         }
1186         else if(flags == 0)
1187         {
1188             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1189             if (pEntry->lock == 0)
1190             {
1191                 /* Frees block */
1192                 return LOCAL_Free( ds, handle );
1193             }
1194         }
1195         return 0;
1196     }
1197
1198     arena = ARENA_HEADER( blockhandle );
1199     TRACE(local, "arena is %04x\n", arena );
1200     pArena = ARENA_PTR( ptr, arena );
1201
1202     if(size <= 4) size = 5;
1203     oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1204     nextarena = LALIGN(blockhandle + size);
1205
1206       /* Check for size reduction */
1207
1208     if (nextarena <= pArena->next)
1209     {
1210         TRACE(local, "size reduction, making new free block\n");
1211         LOCAL_ShrinkArena(ds, arena, nextarena - arena);
1212         TRACE(local, "returning %04x\n", handle );
1213         return handle;
1214     }
1215
1216       /* Check if the next block is free and large enough */
1217
1218     pNext = ARENA_PTR( ptr, pArena->next );
1219     if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1220         (nextarena <= pNext->next))
1221     {
1222         TRACE(local, "size increase, making new free block\n");
1223         LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
1224         TRACE(local, "returning %04x\n", handle );
1225         return handle;
1226     }
1227
1228     /* Now we have to allocate a new block, but not if (fixed block or locked
1229        block) and no LMEM_MOVEABLE */
1230
1231     if (!(flags & LMEM_MOVEABLE))
1232     {
1233         if (HANDLE_FIXED(handle))
1234         {
1235             WARN(local, "Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1236             return 0;
1237         }
1238         else
1239         {
1240             if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
1241             {
1242                 WARN(local, "Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
1243                 return 0;
1244             }
1245         }
1246     }
1247     if(HANDLE_MOVEABLE(handle)) size += sizeof(HLOCAL16);
1248     hmem = LOCAL_GetBlock( ds, size, flags );
1249     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr                             */
1250     if(HANDLE_MOVEABLE(handle))         /* LOCAL_GetBlock might have triggered    */
1251     {                                   /* a compaction, which might in turn have */
1252       blockhandle = pEntry->addr ;      /* moved the very block we are resizing   */
1253       arena = ARENA_HEADER( blockhandle );   /* thus, we reload arena, too        */
1254     }
1255     if (!hmem)
1256     {
1257         /* Remove the block from the heap and try again */
1258         LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
1259         if (!buffer) return 0;
1260         memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
1261         LOCAL_FreeArena( ds, arena );
1262         if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
1263         {
1264             if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
1265             {
1266                 fprintf( stderr, "LocalRealloc: can't restore saved block\n" );
1267                 HeapFree( GetProcessHeap(), 0, buffer );
1268                 return 0;
1269             }
1270             size = oldsize;
1271         }
1272         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1273         memcpy( ptr + hmem, buffer, oldsize );
1274         HeapFree( GetProcessHeap(), 0, buffer );
1275     }
1276     else
1277     {
1278         memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1279         LOCAL_FreeArena( ds, arena );
1280     }
1281     if (HANDLE_MOVEABLE( handle ))
1282     {
1283         TRACE(local, "fixing handle\n");
1284         pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1285         pEntry->addr = hmem + sizeof(HLOCAL16);
1286         /* Back ptr should still be correct */
1287         if(*(HLOCAL16 *)(ptr + hmem) != handle)
1288             fprintf(stderr, "Local_ReAlloc: back ptr is invalid.\n");
1289         hmem = handle;
1290     }
1291     if (size == oldsize) hmem = 0;  /* Realloc failed */
1292     TRACE(local, "returning %04x\n", hmem );
1293     return hmem;
1294 }
1295
1296
1297 /***********************************************************************
1298  *           LOCAL_InternalLock
1299  */
1300 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1301 {
1302     HLOCAL16 old_handle = handle;
1303
1304     if (HANDLE_MOVEABLE(handle))
1305     {
1306         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1307         if (pEntry->flags == LMEM_DISCARDED) return 0;
1308         if (pEntry->lock < 0xfe) pEntry->lock++;
1309         handle = pEntry->addr;
1310     }
1311     TRACE(local, "%04x returning %04x\n",
1312                    old_handle, handle );
1313     return handle;
1314 }
1315
1316
1317 /***********************************************************************
1318  *           LOCAL_Lock
1319  */
1320 LPSTR LOCAL_Lock( HANDLE16 ds, HLOCAL16 handle )
1321 {
1322     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1323     return handle ? ptr + LOCAL_InternalLock( ptr, handle ) : NULL;
1324 }
1325
1326
1327 /***********************************************************************
1328  *           LOCAL_LockSegptr
1329  */
1330 SEGPTR LOCAL_LockSegptr( HANDLE16 ds, HLOCAL16 handle )
1331 {
1332     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1333     return PTR_SEG_OFF_TO_SEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1334 }
1335
1336
1337 /***********************************************************************
1338  *           LOCAL_Unlock
1339  */
1340 BOOL16 LOCAL_Unlock( HANDLE16 ds, HLOCAL16 handle )
1341 {
1342     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1343
1344     TRACE(local, "%04x\n", handle );
1345     if (HANDLE_MOVEABLE(handle))
1346     {
1347         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1348         if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1349         /* For moveable block, return the new lock count */
1350         /* (see _Windows_Internals_ p. 197) */
1351         return --pEntry->lock;
1352     }
1353     else return FALSE;
1354 }
1355
1356
1357 /***********************************************************************
1358  *           LOCAL_Size
1359  *
1360  * Implementation of LocalSize().
1361  */
1362 WORD LOCAL_Size( HANDLE16 ds, HLOCAL16 handle )
1363 {
1364     char *ptr = PTR_SEG_OFF_TO_LIN( CURRENT_DS, 0 );
1365     LOCALARENA *pArena;
1366
1367     TRACE(local, "%04x ds=%04x\n", handle, ds );
1368
1369     if (HANDLE_MOVEABLE( handle )) handle = *(WORD *)(ptr + handle);
1370     if (!handle) return 0;
1371     pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1372     return pArena->next - handle;
1373 }
1374
1375
1376 /***********************************************************************
1377  *           LOCAL_Flags
1378  *
1379  * Implementation of LocalFlags().
1380  */
1381 WORD LOCAL_Flags( HANDLE16 ds, HLOCAL16 handle )
1382 {
1383     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1384
1385     if (HANDLE_MOVEABLE(handle))
1386     {
1387         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1388         TRACE(local, "(%04x,%04x): returning %04x\n",
1389                        ds, handle, pEntry->lock | (pEntry->flags << 8) );
1390         return pEntry->lock | (pEntry->flags << 8);
1391     }
1392     else
1393     {
1394         TRACE(local, "(%04x,%04x): returning 0\n",
1395                        ds, handle );
1396         return 0;
1397     }
1398 }
1399
1400
1401 /***********************************************************************
1402  *           LOCAL_HeapSize
1403  *
1404  * Implementation of LocalHeapSize().
1405  */
1406 WORD LOCAL_HeapSize( HANDLE16 ds )
1407 {
1408     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1409     if (!pInfo) return 0;
1410     return pInfo->last - pInfo->first;
1411 }
1412
1413
1414 /***********************************************************************
1415  *           LOCAL_CountFree
1416  *
1417  * Implementation of LocalCountFree().
1418  */
1419 WORD LOCAL_CountFree( HANDLE16 ds )
1420 {
1421     WORD arena, total;
1422     LOCALARENA *pArena;
1423     LOCALHEAPINFO *pInfo;
1424     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1425
1426     if (!(pInfo = LOCAL_GetHeap( ds )))
1427     {
1428         fprintf( stderr, "LOCAL_Handle(%04x): Local heap not found\n", ds );
1429         LOCAL_PrintHeap( ds );
1430         return 0;
1431     }
1432
1433     total = 0;
1434     arena = pInfo->first;
1435     pArena = ARENA_PTR( ptr, arena );
1436     for (;;)
1437     {
1438         arena = pArena->free_next;
1439         pArena = ARENA_PTR( ptr, arena );
1440         if (arena == pArena->free_next) break;
1441         total += pArena->size;
1442     }
1443     TRACE(local, "(%04x): returning %d\n", ds, total);
1444     return total;
1445 }
1446
1447
1448 /***********************************************************************
1449  *           LOCAL_Handle
1450  *
1451  * Implementation of LocalHandle().
1452  */
1453 HLOCAL16 LOCAL_Handle( HANDLE16 ds, WORD addr )
1454 {
1455     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1456     LOCALHEAPINFO *pInfo;
1457     WORD table;
1458
1459     if (!(pInfo = LOCAL_GetHeap( ds )))
1460     {
1461         fprintf( stderr, "LOCAL_Handle(%04x): Local heap not found\n", ds );
1462         LOCAL_PrintHeap( ds );
1463         return 0;
1464     }
1465
1466     /* Find the address in the entry tables */
1467
1468     table = pInfo->htable;
1469     while (table)
1470     {
1471         WORD count = *(WORD *)(ptr + table);
1472         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1473         for (; count > 0; count--, pEntry++)
1474             if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1475         table = *(WORD *)pEntry;
1476     }
1477
1478     return (HLOCAL16)addr;  /* Fixed block handle is addr */
1479 }
1480
1481
1482 /***********************************************************************
1483  *           LocalAlloc16   (KERNEL.5)
1484  */
1485 HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
1486 {
1487     return LOCAL_Alloc( CURRENT_DS, flags, size );
1488 }
1489
1490
1491 /***********************************************************************
1492  *           LocalReAlloc16   (KERNEL.6)
1493  */
1494 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1495 {
1496     return LOCAL_ReAlloc( CURRENT_DS, handle, size, flags );
1497 }
1498
1499
1500 /***********************************************************************
1501  *           LocalFree16   (KERNEL.7)
1502  */
1503 HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
1504 {
1505     return LOCAL_Free( CURRENT_DS, handle );
1506 }
1507
1508
1509 /***********************************************************************
1510  *           LocalLock16   (KERNEL.8)
1511  *
1512  * Note: only the offset part of the pointer is returned by the relay code.
1513  */
1514 SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
1515 {
1516     return LOCAL_LockSegptr( CURRENT_DS, handle );
1517 }
1518
1519
1520 /***********************************************************************
1521  *           LocalUnlock16   (KERNEL.9)
1522  */
1523 BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
1524 {
1525     return LOCAL_Unlock( CURRENT_DS, handle );
1526 }
1527
1528
1529 /***********************************************************************
1530  *           LocalSize16   (KERNEL.10)
1531  */
1532 UINT16 WINAPI LocalSize16( HLOCAL16 handle )
1533 {
1534     return LOCAL_Size( CURRENT_DS, handle );
1535 }
1536
1537
1538 /***********************************************************************
1539  *           LocalHandle16   (KERNEL.11)
1540  */
1541 HLOCAL16 WINAPI LocalHandle16( WORD addr )
1542 {
1543     return LOCAL_Handle( CURRENT_DS, addr );
1544 }
1545
1546
1547 /***********************************************************************
1548  *           LocalFlags16   (KERNEL.12)
1549  */
1550 UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
1551 {
1552     return LOCAL_Flags( CURRENT_DS, handle );
1553 }
1554
1555
1556 /***********************************************************************
1557  *           LocalCompact16   (KERNEL.13)
1558  */
1559 UINT16 WINAPI LocalCompact16( UINT16 minfree )
1560 {
1561     TRACE(local, "%04x\n", minfree );
1562     return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1563 }
1564
1565
1566 /***********************************************************************
1567  *           LocalNotify   (KERNEL.14)
1568  */
1569 FARPROC16 WINAPI LocalNotify( FARPROC16 func )
1570 {
1571     LOCALHEAPINFO *pInfo;
1572     FARPROC16 oldNotify;
1573     HANDLE16 ds = CURRENT_DS;
1574
1575     if (!(pInfo = LOCAL_GetHeap( ds )))
1576     {
1577         ERR(local, "(%04x): Local heap not found\n", ds );
1578         LOCAL_PrintHeap( ds );
1579         return 0;
1580     }
1581     TRACE(local, "(%04x): %08lx\n", ds, (DWORD)func );
1582     FIXME(local, "Half implemented\n");
1583     oldNotify = pInfo->notify;
1584     pInfo->notify = func;
1585     return oldNotify;
1586 }
1587
1588
1589 /***********************************************************************
1590  *           LocalShrink16   (KERNEL.121)
1591  */
1592 UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1593 {
1594     TRACE(local, "%04x %04x\n", handle, newsize );
1595     return 0;
1596 }
1597
1598
1599 /***********************************************************************
1600  *           GetHeapSpaces   (KERNEL.138)
1601  */
1602 DWORD WINAPI GetHeapSpaces( HMODULE16 module )
1603 {
1604     NE_MODULE *pModule;
1605     WORD ds;
1606
1607     if (!(pModule = MODULE_GetPtr( module ))) return 0;
1608     ds = (NE_SEG_TABLE( pModule ) + pModule->dgroup - 1)->selector;
1609     return MAKELONG( LOCAL_CountFree( ds ), LOCAL_HeapSize( ds ) );
1610 }
1611
1612
1613 /***********************************************************************
1614  *           LocalCountFree   (KERNEL.161)
1615  */
1616 WORD WINAPI LocalCountFree(void)
1617 {
1618     return LOCAL_CountFree( CURRENT_DS );
1619 }
1620
1621
1622 /***********************************************************************
1623  *           LocalHeapSize   (KERNEL.162)
1624  */
1625 WORD WINAPI LocalHeapSize(void)
1626 {
1627     TRACE(local, "(void)\n" );
1628     return LOCAL_HeapSize( CURRENT_DS );
1629 }
1630
1631
1632 /***********************************************************************
1633  *           LocalHandleDelta   (KERNEL.310)
1634  */
1635 WORD WINAPI LocalHandleDelta( WORD delta )
1636 {
1637     LOCALHEAPINFO *pInfo;
1638
1639     if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1640     {
1641         ERR(local, "Local heap not found\n");
1642         LOCAL_PrintHeap( CURRENT_DS );
1643         return 0;
1644     }
1645     if (delta) pInfo->hdelta = delta;
1646     TRACE(local, "returning %04x\n", pInfo->hdelta);
1647     return pInfo->hdelta;
1648 }
1649
1650
1651 /***********************************************************************
1652  *           LocalInfo   (TOOLHELP.56)
1653  */
1654 BOOL16 WINAPI LocalInfo( LOCALINFO *pLocalInfo, HGLOBAL16 handle )
1655 {
1656     LOCALHEAPINFO *pInfo = LOCAL_GetHeap(SELECTOROF(WIN16_GlobalLock16(handle)));
1657     if (!pInfo) return FALSE;
1658     pLocalInfo->wcItems = pInfo->items;
1659     return TRUE;
1660 }
1661
1662
1663 /***********************************************************************
1664  *           LocalFirst   (TOOLHELP.57)
1665  */
1666 BOOL16 WINAPI LocalFirst( LOCALENTRY *pLocalEntry, HGLOBAL16 handle )
1667 {
1668     WORD ds = GlobalHandleToSel( handle );
1669     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1670     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1671     if (!pInfo) return FALSE;
1672
1673     pLocalEntry->hHandle   = pInfo->first + ARENA_HEADER_SIZE;
1674     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1675     pLocalEntry->wFlags    = LF_FIXED;
1676     pLocalEntry->wcLock    = 0;
1677     pLocalEntry->wType     = LT_NORMAL;
1678     pLocalEntry->hHeap     = handle;
1679     pLocalEntry->wHeapType = NORMAL_HEAP;
1680     pLocalEntry->wNext     = ARENA_PTR(ptr,pInfo->first)->next;
1681     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1682     return TRUE;
1683 }
1684
1685
1686 /***********************************************************************
1687  *           LocalNext   (TOOLHELP.58)
1688  */
1689 BOOL16 WINAPI LocalNext( LOCALENTRY *pLocalEntry )
1690 {
1691     WORD ds = GlobalHandleToSel( pLocalEntry->hHeap );
1692     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1693     LOCALARENA *pArena;
1694
1695     if (!LOCAL_GetHeap( ds )) return FALSE;
1696     if (!pLocalEntry->wNext) return FALSE;
1697     pArena = ARENA_PTR( ptr, pLocalEntry->wNext );
1698
1699     pLocalEntry->hHandle   = pLocalEntry->wNext + ARENA_HEADER_SIZE;
1700     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1701     pLocalEntry->wFlags    = (pArena->prev & 3) + 1;
1702     pLocalEntry->wcLock    = 0;
1703     pLocalEntry->wType     = LT_NORMAL;
1704     if (pArena->next != pLocalEntry->wNext)  /* last one? */
1705         pLocalEntry->wNext = pArena->next;
1706     else
1707         pLocalEntry->wNext = 0;
1708     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1709     return TRUE;
1710 }
1711
1712
1713 /***********************************************************************
1714  *           LocalAlloc32   (KERNEL32.371)
1715  * RETURNS
1716  *      Handle: Success
1717  *      NULL: Failure
1718  */
1719 HLOCAL32 WINAPI LocalAlloc32(
1720                 UINT32 flags, /* [in] Allocation attributes */
1721                 DWORD size    /* [in] Number of bytes to allocate */
1722 ) {
1723     return (HLOCAL32)GlobalAlloc32( flags, size );
1724 }
1725
1726
1727 /***********************************************************************
1728  *           LocalCompact32   (KERNEL32.372)
1729  */
1730 UINT32 WINAPI LocalCompact32( UINT32 minfree )
1731 {
1732     return 0;  /* LocalCompact does nothing in Win32 */
1733 }
1734
1735
1736 /***********************************************************************
1737  *           LocalFlags32   (KERNEL32.374)
1738  * RETURNS
1739  *      Value specifying allocation flags and lock count.
1740  *      LMEM_INVALID_HANDLE: Failure
1741  */
1742 UINT32 WINAPI LocalFlags32(
1743               HLOCAL32 handle /* [in] Handle of memory object */
1744 ) {
1745     return GlobalFlags32( (HGLOBAL32)handle );
1746 }
1747
1748
1749 /***********************************************************************
1750  *           LocalFree32   (KERNEL32.375)
1751  * RETURNS
1752  *      NULL: Success
1753  *      Handle: Failure
1754  */
1755 HLOCAL32 WINAPI LocalFree32(
1756                 HLOCAL32 handle /* [in] Handle of memory object */
1757 ) {
1758     return (HLOCAL32)GlobalFree32( (HGLOBAL32)handle );
1759 }
1760
1761
1762 /***********************************************************************
1763  *           LocalHandle32   (KERNEL32.376)
1764  * RETURNS
1765  *      Handle: Success
1766  *      NULL: Failure
1767  */
1768 HLOCAL32 WINAPI LocalHandle32(
1769                 LPCVOID ptr /* [in] Address of local memory object */
1770 ) {
1771     return (HLOCAL32)GlobalHandle32( ptr );
1772 }
1773
1774
1775 /***********************************************************************
1776  *           LocalLock32   (KERNEL32.377)
1777  * Locks a local memory object and returns pointer to the first byte
1778  * of the memory block.
1779  *
1780  * RETURNS
1781  *      Pointer: Success
1782  *      NULL: Failure
1783  */
1784 LPVOID WINAPI LocalLock32(
1785               HLOCAL32 handle /* [in] Address of local memory object */
1786 ) {
1787     return GlobalLock32( (HGLOBAL32)handle );
1788 }
1789
1790
1791 /***********************************************************************
1792  *           LocalReAlloc32   (KERNEL32.378)
1793  * RETURNS
1794  *      Handle: Success
1795  *      NULL: Failure
1796  */
1797 HLOCAL32 WINAPI LocalReAlloc32(
1798                 HLOCAL32 handle, /* [in] Handle of memory object */
1799                 DWORD size,      /* [in] New size of block */
1800                 UINT32 flags     /* [in] How to reallocate object */
1801 ) {
1802     return (HLOCAL32)GlobalReAlloc32( (HGLOBAL32)handle, size, flags );
1803 }
1804
1805
1806 /***********************************************************************
1807  *           LocalShrink32   (KERNEL32.379)
1808  */
1809 UINT32 WINAPI LocalShrink32( HGLOBAL32 handle, UINT32 newsize )
1810 {
1811     return 0;  /* LocalShrink does nothing in Win32 */
1812 }
1813
1814
1815 /***********************************************************************
1816  *           LocalSize32   (KERNEL32.380)
1817  * RETURNS
1818  *      Size: Success
1819  *      0: Failure
1820  */
1821 UINT32 WINAPI LocalSize32(
1822               HLOCAL32 handle /* [in] Handle of memory object */
1823 ) {
1824     return GlobalSize32( (HGLOBAL32)handle );
1825 }
1826
1827
1828 /***********************************************************************
1829  *           LocalUnlock32   (KERNEL32.381)
1830  * RETURNS
1831  *      TRUE: Object is still locked
1832  *      FALSE: Object is unlocked
1833  */
1834 BOOL32 WINAPI LocalUnlock32(
1835               HLOCAL32 handle /* [in] Handle of memory object */
1836 ) {
1837     return GlobalUnlock32( (HGLOBAL32)handle );
1838 }