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windows消息机制之HMIsMarkDestroy宏定义的理解

article 2025/2/21 3:50:16

/* windows/core/ntuser/inc/user.h:1658:#define HMIsMarkDestroy(p) (HMPheFromObject(p)->bFlags & HANDLEF_DESTROY)
#define HMPheFromObject(p) DBGHMPheFromObject((p))

#define HANDLEF_DESTROY        0x01
#define HANDLEF_INDESTROY      0x02
#define HANDLEF_MARKED_OK      0x10
#define HANDLEF_GRANTED        0x20
#define HANDLEF_POOL           0x40     // for the mother desktop window
#define HANDLEF_VALID          0x7F

/*
* The following is a handle table entry.
*
* Note that by keeping a pointer to the owning entity (process or
* thread), cleanup will touch only those objects that belong to
* the entity being destroyed. This helps keep the working set
* size down. Look at DestroyProcessesObjects() for an example.
*/
typedef struct _HANDLEENTRY {
    PHEAD       phead;                  /* pointer to the real object */
    KERNEL_PVOID pOwner;                 /* pointer to owning entity (pti or ppi) */
    BYTE        bType;                  /* type of object */
    BYTE        bFlags;                 /* flags - like destroy flag */
    WORD        wUniq;                  /* uniqueness count */

#if DBG || FRE_LOCK_RECORD
PLR plr; /* lock record pointer */
#endif // DBG

} HANDLEENTRY;

/*
* Change HMINDEXBITS for bits that make up table index in handle
* Change HMUNIQSHIFT for count of bits to shift uniqueness left.
* Change HMUNIQBITS for bits that make up uniqueness.
*
* Currently 64K handles can be created, w/16 bits of uniqueness.
*/
#define HMINDEXBITS             0x0000FFFF      // bits where index is stored
#define HMUNIQSHIFT             16              // bits to shift uniqueness
#define HMUNIQBITS              0xFFFF          // valid uniqueness bits

#ifdef _USERK_
#define HMHandleFromIndex(i) LongToHandle((LONG)(i) | ((LONG)gSharedInfo.aheList[i].wUniq << HMUNIQSHIFT))
#define HMObjectFlags(p) (gahti[HMObjectType(p)].bObjectCreateFlags)
#endif

#define HMIndexFromHandle(h)    ((ULONG)(((ULONG_PTR)(h)) & HMINDEXBITS))               B部分:
#define _HMPheFromObject(p)      (&gSharedInfo.aheList[HMIndexFromHandle((((PHEAD)p)->h))])       A部分:
#define _HMObjectFromHandle(h) ((KERNEL_PVOID)(gSharedInfo.aheList[HMIndexFromHandle(h)].phead))
#define HMUniqFromHandle(h)     ((WORD)((((ULONG_PTR)h) >> HMUNIQSHIFT) & HMUNIQBITS))
#define HMObjectType(p)         (HMPheFromObject(p)->bType)

#define HMIsMarkDestroy(p) (HMPheFromObject(p)->bFlags & HANDLEF_DESTROY) C部分:

A部分解释:
#define _HMPheFromObject(p) (&gSharedInfo.aheList[HMIndexFromHandle((((PHEAD)p)->h))]) A部分:

typedef struct _THROBJHEAD {
HEAD;
PTHREADINFO pti;
} THROBJHEAD, * KPTR_MODIFIER PTHROBJHEAD;

typedef struct _DESKHEAD {
PDESKTOP rpdesk;
KPBYTE pSelf;
} DESKHEAD, *PDESKHEAD;

typedef struct _THRDESKHEAD {
THROBJHEAD;
DESKHEAD;
} THRDESKHEAD, *PTHRDESKHEAD;

/*
* The following is the header of all objects managed in the handle list.
* (allocated as part of the object for easy access). All object
* headers must start with the members of a HEAD structure.
*/
typedef struct _HEAD {
KHANDLE h;
DWORD cLockObj;
} HEAD, * KPTR_MODIFIER PHEAD;

B部分解释:

#define HMINDEXBITS             0x0000FFFF      // bits where index is stored
#define HMUNIQSHIFT             16              // bits to shift uniqueness
#define HMUNIQBITS              0xFFFF          // valid uniqueness bits

#ifdef _USERK_
#define HMHandleFromIndex(i) LongToHandle((LONG)(i) | ((LONG)gSharedInfo.aheList[i].wUniq << HMUNIQSHIFT))
#define HMObjectFlags(p) (gahti[HMObjectType(p)].bObjectCreateFlags)
#endif

#define HMIndexFromHandle(h) ((ULONG)(((ULONG_PTR)(h)) & HMINDEXBITS)) B部分:

C部分解释:
#define HMIsMarkDestroy(p) (HMPheFromObject(p)->bFlags & HANDLEF_DESTROY) C部分:

参考数据结构D:
typedef struct tagSHAREDINFO {
    PSERVERINFO     psi;
    PHE             aheList;         /* handle table pointer                */
    PDISPLAYINFO    pDispInfo;       /* global displayinfo                  */
    KERNEL_UINT_PTR ulSharedDelta;   /* delta between client and kernel mapping of ...*/
                                     /* shared memory section. Only valid/used in client.*/

WNDMSG awmControl[FNID_END - FNID_START + 1];

WNDMSG DefWindowMsgs;
WNDMSG DefWindowSpecMsgs;
} SHAREDINFO, *PSHAREDINFO;

extern SHAREDINFO gSharedInfo;

参考数据结构E:
typedef struct tagWND {
THRDESKHEAD head;

    WW;         // WOW-USER common fields. Defined in wowuserp.h
                // The presence of "state" at the start of this structure is
                // assumed by the STATEOFFSET macro.

    PWND                 spwndNext;    // Handle to the next window
    PWND                 spwndPrev;    // Handle to the previous window
    PWND                 spwndParent; // Backpointer to the parent window.
    PWND                 spwndChild;   // Handle to child
    PWND                 spwndOwner;   // Popup window owner field

RECT rcWindow; // Window outer rectangle
RECT rcClient; // Client rectangle

WNDPROC_PWND lpfnWndProc; // Can be WOW address or standard address

PCLS pcls; // Pointer to window class

KHRGN hrgnUpdate; // Accumulated paint region

PPROPLIST ppropList; // Pointer to property list
PSBINFO pSBInfo; // Words used for scrolling

PMENU spmenuSys; // Handle to system menu
PMENU spmenu; // Menu handle or ID

KHRGN hrgnClip; // Clipping region for this window

    LARGE_UNICODE_STRING strName;
    int                  cbwndExtra;   // Extra bytes in window
    PWND                 spwndLastActive; // Last active in owner/ownee list
    KHIMC                hImc;         // Associated input context handle
    KERNEL_ULONG_PTR     dwUserData;   // Reserved for random application data
    struct _ACTIVATION_CONTEXT * KPTR_MODIFIER pActCtx;
} WND;

typedef struct tagWND * KPTR_MODIFIER PWND;

typedef struct _HANDLEENTRY * KPTR_MODIFIER PHE;

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