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;***
;heap.inc - definitions and structures for C library heap
;
; Copyright (c) 1987-1990, Microsoft Corporation. All rights reserved.
;
;Purpose:
; This file contains definitions and structures used by
; the C library heap routines.
;
;*******************************************************************************

;
; --- Heap segment descriptor ---
;
; [***NOTE*** Some heap routines make assumptions about the layout of the
; heap descriptor. If this descriptor changes, some routines may break.]
;

_heap_seg_desc struc
checksum dw ? ; checksum area
flags dw ? ; flags word
segsize dw ? ; size of segment
start dw ? ; offset of first heap entry
rover dw ? ; rover offset
last dw ? ; offset to end-of-heap marker
nextseg dd ? ; far pointer to next _heap_seg_desc
prevseg dd ? ; far pointer to previous _heap_seg_desc
_heap_seg_desc ends

;
; _heap_seg_desc.flags bit offsets
;

_HEAP_MODIFY equ 01h ; heap segment size can be modified
_HEAP_FREE equ 02h ; heap segment may be freed up to OS
_HEAP_NEAR equ 04h ; heap segment is part of the near heap
_HEAP_BASED equ 08h ; heap segment is part of the based heap

;
; --- Heap Linked List Descriptor ---
;
; [***NOTE*** Some heap routines make assumptions about the layout of the
; heap list descriptor. If this descriptor changes, some routines may break.]
;

_heap_list_desc struc
startseg dd 0 ; pointer to first heap descriptor
roverseg dd 0 ; rover pointer
lastseg dd 0 ; pointer to last heap descriptor
segflags dw 0 ; flags word for init'ing new segs
_heap_list_desc ends

;
; --- General Use Heap Constants ---
;

_HEAP_END equ 0FFFEh ; End-of-heap flag
_HEAP_COALESCE equ 0FFFEh ; Coalesce segment value
_HEAP_GROWSEG equ 2 shl 12 ; Default (8K) heap seg growth increment
_HEAP_GROWSTART equ 2 shl 9 ; Startup heap seg growth size (1K)
_HEAP_MAXREQ equ 0FFFCh - (size _heap_seg_desc) ; Max heap request size
_HEAP_MINSEG equ ((size _heap_seg_desc) + 4) ; Min size heap segment

;
; --- Heap Check/Set/Walk Definitions ---
;

; Heap info structure used by heapwalk

_heapinfo struc
_pentry_off dw ? ; far pointer to heap entry (offset)
_pentry_seg dw ? ; far pointer to heap entry (segment)
_size dw ? ; size of entry
_useflag dw ? ; in use flag
_heapinfo ends

;
; Heap Check/Set/Walk Constants
; [NOTE: These definitions must match malloc.h]
;

_HEAPEMPTY equ -1
_HEAPOK equ -2
_HEAPBADBEGIN equ -3
_HEAPBADNODE equ -4
_HEAPEND equ -5
_HEAPBADPTR equ -6

_HEAPSET_NOFILL equ 07FFFh

_FREEENTRY equ 0
_USEDENTRY equ 1

;
; Return value denoting failure for based heap functions of based pointer
; return type. The name and definition must correspond to the one given
; in MALLOC.H.
;

_NULLOFF equ -1


IFDEF M_XENIX
;
; --- XENIX Heap Support ---
;

BR_ARGSEG equ 1 ; specified segment
BR_NEWSEG equ 2 ; new segment
BR_IMPSEG equ 3 ; last or new segment
BR_FREESEG equ 4 ; free segment

ENDIF