v2 / vlib / builtin / gc_debugger_linux.h
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1#ifndef V_BUILTIN_GC_DEBUGGER_LINUX_H


2#define V_BUILTIN_GC_DEBUGGER_LINUX_H


3


4#if defined(__linux__)


5#include <fcntl.h>


6#include <string.h>


7#include <unistd.h>


8


9#pragma weak __data_start


10#pragma weak data_start


11#pragma weak _end


12


13extern int __data_start[];


14extern int data_start[];


15extern int _end[];


16


17static inline int v__gc_can_register_main_data_roots_linux(void) {


18    void* data_start_ptr = __data_start != NULL ? (void*)__data_start : (void*)data_start;


19    void* data_end_ptr = (void*)_end;


20    return data_start_ptr != NULL && data_end_ptr != NULL && data_start_ptr < data_end_ptr;


21}


22


23static inline int v__gc_debugger_present_linux(void) {


24    int fd = open("/proc/self/status", O_RDONLY);


25    if (fd < 0) {


26        return 0;


27    }


28    char buf[4096];


29    ssize_t n = read(fd, buf, sizeof(buf) - 1);


30    (void)close(fd);


31    if (n <= 0) {


32        return 0;


33    }


34    buf[n] = '\0';


35    char* tracer_pid = strstr(buf, "TracerPid:");


36    if (tracer_pid == NULL) {


37        return 0;


38    }


39    tracer_pid += sizeof("TracerPid:") - 1;


40    while (*tracer_pid == ' ' || *tracer_pid == '\t') {


41        ++tracer_pid;


42    }


43    return *tracer_pid != '0' && *tracer_pid != '\n' && *tracer_pid != '\0';


44}


45


46static inline void v__gc_register_main_data_roots_linux(void) {


47    if (!v__gc_can_register_main_data_roots_linux()) {


48        return;


49    }


50    void* data_start_ptr = __data_start != NULL ? (void*)__data_start : (void*)data_start;


51    GC_add_roots(data_start_ptr, (void*)_end);


52}


53#endif


54


55#endif


56