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c++cgdbcygwin

Chromium `debugger` equivalent, on `gdb` for Cygwin?

How do people trigger a breakpoint on gdb (for Cygwin, specifically) from the very source code?

Like when a JS script has the debugger word in it and Chromium dev tools trigger stop for debugging?

Solution

  • Here's how SDL2 implements this feature:

    #if defined(_MSC_VER)
/* Don't include intrin.h here because it contains C++ code */
    extern void __cdecl __debugbreak(void);
    #define SDL_TriggerBreakpoint() __debugbreak()
#elif ( (!defined(__NACL__)) && ((defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))) )
    #define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "int $3\n\t" )
#elif defined(__386__) && defined(__WATCOMC__)
    #define SDL_TriggerBreakpoint() { _asm { int 0x03 } }
#elif defined(HAVE_SIGNAL_H) && !defined(__WATCOMC__)
    #include <signal.h>
    #define SDL_TriggerBreakpoint() raise(SIGTRAP)
#else
    /* How do we trigger breakpoints on this platform? */
    #define SDL_TriggerBreakpoint()
#endif

    The conditionals should probably resolve to __asm__ __volatile__ ( "int $3\n\t" ) on Cygwin.