ctors，dtors，_ctors&_dtors

最新推荐文章于 2024-07-17 10:31:30 发布

原创最新推荐文章于 2024-07-17 10:31:30 发布 · 3.1k 阅读

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CC 4.0 BY-SA版权

本文介绍了一种用于管理静态构造函数和析构函数的方法，适用于运行时系统。通过使用特定的数据结构和编译器特性，该方法能够在程序启动和退出时正确调用静态构造函数与析构函数。

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/* ctors and dtors arrays -- to be used by runtime system */
/*   to call static constructors and destructors          */
/*                                                        */
/* NOTE: Use a C compiler to compile this file. If you    */
/*       are using GNU C++, be sure to use compile this   */
/*       file using a GNU compiler with the               */
/*       -fdollars-in-identifiers flag.                   */


#if defined(__GNUC__)

extern void __register_frame_info (const void *, void *);
extern void *__deregister_frame_info (const void *);
extern const unsigned __EH_FRAME_BEGIN__[];
static void _STI__15_ctors ()
{
  /* This structure must approximately match that in unwind-dw2-fde.h.
     In particular it must be no smaller, and no less aligned.  */
  static struct object {
    void *pc_begin; void *tbase; void *dbase; void *u;
    unsigned long b; void *fde_end; struct object *next;
  } object;
  __register_frame_info (__EH_FRAME_BEGIN__, &object);
}

static void _STD__15_dtors ()
{
  __deregister_frame_info (__EH_FRAME_BEGIN__);
}
#else
static void _STI__15_ctors ()
{
}

static void _STD__15_dtors ()
{
}
#endif
char __dso_handle = 0;

extern void (*_ctors[])();
void (*_ctors[])() =
    {
    _STI__15_ctors,
    0
    };

void _STD__15_dtors();

extern void (*_dtors[])();
void (*_dtors[])() =
    {
    _STD__15_dtors,
    0
    };

/* build variables */
#ifdef __GNUC__
__asm(" .section \".wrs_build_vars\",\"a\"");
#endif
#ifdef __DCC__
__asm(" .section \".wrs_build_vars\",\"r\"");
#endif
__asm(" .ascii \"tag SMP 1\"");
__asm(" .byte 0");
__asm(" .ascii \"end\"");
__asm(" .byte 0");
__asm(" .previous");





000635c8 <_STI__15_ctors>:
   635c8:   e1a0c00d    mov ip, sp
   635cc:   e92dd800    push    {fp, ip, lr, pc}
   635d0:   e24cb004    sub fp, ip, #4
   635d4:   e59f0008    ldr r0, [pc, #8]    ; 635e4 <_STI__15_ctors+0x1c>
   635d8:   e59f1008    ldr r1, [pc, #8]    ; 635e8 <_STI__15_ctors+0x20>
   635dc:   eb000000    bl  8 <__register_frame_info+0x8>
   635e0:   e89da800    ldm sp, {fp, sp, pc}
    ...

000635ec <_STD__15_dtors>:
   635ec:   e1a0c00d    mov ip, sp
   635f0:   e92dd800    push    {fp, ip, lr, pc}
   635f4:   e24cb004    sub fp, ip, #4
   635f8:   e59f0004    ldr r0, [pc, #4]    ; 63604 <_STD__15_dtors+0x18>
   635fc:   eb000000    bl  8 <__deregister_frame_info+0x8>
   63600:   e89da800    ldm sp, {fp, sp, pc}
   63604:   00000000    andeq   r0, r0, r0