libgo/runtime/go-traceback.c

   1 /* go-traceback.c -- stack backtrace for Go.
   2
   3    Copyright 2012 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include "config.h"
   8
   9 #include "unwind.h"
  10
  11 #include "runtime.h"
  12 #include "go-string.h"
  13
  14 static _Unwind_Reason_Code
  15 traceback (struct _Unwind_Context *context, void *varg)
  16 {
  17   int *parg = (int *) varg;
  18   uintptr pc;
  19   int ip_before_insn = 0;
  20   struct __go_string fn;
  21   struct __go_string file;
  22   int line;
  23
  24 #ifdef HAVE_GETIPINFO
  25   pc = _Unwind_GetIPInfo (context, &ip_before_insn);
  26 #else
  27   pc = _Unwind_GetIP (context);
  28 #endif
  29
  30   if (*parg > 100)
  31     return _URC_END_OF_STACK;
  32   ++*parg;
  33
  34   /* FIXME: If PC is in the __morestack routine, we should ignore
  35      it.  */
  36
  37   /* Back up to the call instruction.  */
  38   if (!ip_before_insn)
  39     --pc;
  40
  41   if (!__go_file_line (pc, &fn, &file, &line))
  42     return _URC_END_OF_STACK;
  43
  44   if (runtime_showframe (fn.__data))
  45     {
  46       runtime_printf ("%s\n", fn.__data);
  47       runtime_printf ("\t%s:%d\n", file.__data, line);
  48     }
  49
  50   return _URC_NO_REASON;
  51 }
  52
  53 /* Print a stack trace for the current goroutine.  */
  54
  55 void
  56 runtime_traceback ()
  57 {
  58   int c;
  59
  60   c = 0;
  61   _Unwind_Backtrace (traceback, &c);
  62 }