C++ 静态修饰符如何在 C 中工作

我试图理解"static"修饰符在C中是如何工作的，我go 寻找它的含义，我发现的一切似乎都有点模糊.

它是一个修饰符，允许变量的值一直存在到程序执行结束.

我理解它的含义和用途，但除了这个定义之外，我还想了解它下面是如何工作的，所以我生成了C代码的汇编

char    *thing(char *a)
{
    char *b;

    b = malloc(3);

    b[0] = 'y';
    b[1] = '\0';
    return (b);
}

char    *some(int fd)
{
    static char *a = "happened";
    a = thing(a);
    return (a);
}

我用非静态a变量创建了另一个代码

/* With static variable */
    .file   "static_test.c"
    .text
    .globl  thing
    .type   thing, @function
thing:
.LFB6:
    .cfi_startproc
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    subq    $32, %rsp
    movq    %rdi, -24(%rbp)
    movl    $3, %edi
    call    malloc@PLT
    movq    %rax, -8(%rbp)
    movq    -8(%rbp), %rax
    movb    $121, (%rax)
    movq    -8(%rbp), %rax
    addq    $1, %rax
    movb    $0, (%rax)
    movq    -8(%rbp), %rax
    leave
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE6:
    .size   thing, .-thing
    .globl  some
    .type   some, @function
some:
.LFB7:
    .cfi_startproc
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    subq    $16, %rsp
    movl    %edi, -4(%rbp)
    movq    a.0(%rip), %rax
    movq    %rax, %rdi
    call    thing
    movq    %rax, a.0(%rip)
    movq    a.0(%rip), %rax
    leave
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE7:
    .size   some, .-some
    .section    .rodata
.LC0:
    .string "happened"
    .section    .data.rel.local,"aw"
    .align 8
    .type   a.0, @object
    .size   a.0, 8
a.0:
    .quad   .LC0
    .ident  "GCC: (GNU) 12.1.0"
    .section    .note.GNU-stack,"",@progbits

/* no static variable */
    .file   "nostatic_test.c"
    .text
    .globl  thing
    .type   thing, @function
thing:
.LFB6:
    .cfi_startproc
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    subq    $32, %rsp
    movq    %rdi, -24(%rbp)
    movl    $3, %edi
    call    malloc@PLT
    movq    %rax, -8(%rbp)
    movq    -8(%rbp), %rax
    movb    $121, (%rax)
    movq    -8(%rbp), %rax
    addq    $1, %rax
    movb    $0, (%rax)
    movq    -8(%rbp), %rax
    leave
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE6:
    .size   thing, .-thing
    .section    .rodata
.LC0:
    .string "happened"
    .text
    .globl  some
    .type   some, @function
some:
.LFB7:
    .cfi_startproc
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    subq    $32, %rsp
    movl    %edi, -20(%rbp)
    leaq    .LC0(%rip), %rax
    movq    %rax, -8(%rbp)
    movq    -8(%rbp), %rax
    movq    %rax, %rdi
    call    thing
    movq    %rax, -8(%rbp)
    movq    -8(%rbp), %rax
    leave
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE7:
    .size   some, .-some
    .ident  "GCC: (GNU) 12.1.0"
    .section    .note.GNU-stack,"",@progbits

问题是，这两个汇编代码之间发生了什么以及它们之间的区别，以及它们在编译时和程序执行时的行为.