clang_intprt_t类型探究

void eval() {
    int op, *tmp;
    while (1) {
        if (op == IMM)       {ax = *pc++;}                                     // load immediate value to ax
        else if (op == LC)   {ax = *(char *)ax;}                               // load character to ax, address in ax
        else if (op == LI)   {ax = *(int *)ax;}                                // load integer to ax, address in ax
        else if (op == SC)   {ax = *(char *)*sp++ = ax;}                       // save character to address, value in ax, address on stack
        else if (op == SI)   {*(int *)*sp++ = ax;}                             // save integer to address, value in ax, address on stack
    }
    ...
    return 0;
}

//test.c
#include <stdio.h>
int main() {
    int a = 1;
    int p = &a;
    printf("the result is %d\n",*((int*)p));
}

~$ gcc test.c -o test
test.c: In function ‘main’:
test.c:4:13: warning: initialization makes integer from pointer without a cast [enabled by default]
     int p = &a;
~$ ./test
the result is 1

~$ g++ test.c -o test
ltest.c: In function ‘int main()’:
test.c:4:14: error: invalid conversion from ‘int*’ to ‘int’ [-fpermissive]
     int p = &a;

ch@ch-pc:~$ gcc test.c -o test
test.c: In function ‘main’:
test.c:4:13: warning: initialization makes integer from pointer without a cast [-Wint-conversion]
     int p = &a;
             ^
test.c:5:35: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     printf("the result is %d\n",*((int*)p));
                                   ^
ch@ch-pc:~$ ./test 
段错误 (核心已转储)

ch@ch-pc:~$ g++ test.c -o test
test.c: In function ‘int main()’:
test.c:4:14: error: invalid conversion from ‘int*’ to ‘int’ [-fpermissive]
     int p = &a;
              ^
test.c:5:41: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     printf("the result is %d\n",*((int*)p));

#include <stdio.h>
int main() {
    int *p;
    printf("the result is %lu\n", sizeof(p));
}

//test.c
#include <stdio.h>
int main() {
    int a = 1;
    int p = &a;
    printf("the result is %d\n",*((int*)p));
}
//编译
~$ gcc test.c -o test

// objdump反汇编命令 
//     -S 尽可能尽可能反汇编出源代码
//     -M 因为个人习惯问题，不太会看AT&A的汇编，还是搞成intel的来看
// nl只是把上面的结果显示一下行数，-b 行的显示方式
//     -ba            //显示所有行号（包括空行）
//     -bt            //显示所有行号（但不包括空行）
~$ objdump -S -M intel test | nl -ba

//头文件stdint.h
/* Types for `void *' pointers.  */
#if __WORDSIZE == 64
# ifndef __intptr_t_defined
typedef long int               intptr_t;
#  define __intptr_t_defined
# endif
typedef unsigned long int    uintptr_t;
#else
# ifndef __intptr_t_defined
typedef int                    intptr_t;
#  define __intptr_t_defined
# endif
typedef unsigned int        uintptr_t;
#endif

#include <stdio.h>
#include <stdint.h>
int main() {
    int a = 1;
    int p = &a;
    printf("the result is %d\n",*((int*)(intptr_t)p));
}

        if(op == IMM) {
            ax = *pc++;
        } else if(op == LC) {
            ax = *(char *)(intptr_t)ax;
        } else if(op == LI) {
            ax = *(int *)(intptr_t)ax;
        } else if(op ==SC) {
            ax = *(char *)(intptr_t)*sp++ = ax;
        } else if(op == SI){
            *(int *)(intptr_t)*sp++ = ax;
        } else if(op == PUSH) {
            *--sp = ax;
        } else if(op == JMP) {
            pc = (int *)(intptr_t)*pc;
        } else if(op == JZ) {
            pc = ax ? pc + 1 : (int *)(intptr_t)*pc;
        } else if(op == JNZ) {
            pc = ax ? (int *)(intptr_t)*pc : pc + 1;
        } else if(op == CALL) {
            *--sp = (int)(intptr_t)(pc + 1);
            pc = (int *)(intptr_t)*pc;
        } else if(op == ENT) {
            *--sp = (int)(intptr_t)bp;
            bp = sp;
            sp = sp - *pc++;
        } else if(op == ADJ) {
            sp = sp + (intptr_t)*pc++;
        }