libgo/runtime/go-caller.c

   1 /* go-caller.c -- runtime.Caller and runtime.FuncForPC for Go.
   2
   3    Copyright 2009 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 /* Implement runtime.Caller.  */
   8
   9 #include <stdint.h>
  10
  11 #include "go-string.h"
  12
  13 /* The values returned by runtime.Caller.  */
  14
  15 struct caller_ret
  16 {
  17   uintptr_t pc;
  18   struct __go_string file;
  19   int line;
  20   _Bool ok;
  21 };
  22
  23 /* Implement runtime.Caller.  */
  24
  25 struct caller_ret Caller (int n) asm ("libgo_runtime.runtime.Caller");
  26
  27 struct caller_ret
  28 Caller (int n __attribute__ ((unused)))
  29 {
  30   struct caller_ret ret;
  31
  32   /* A proper implementation needs to dig through the debugging
  33      information.  */
  34   ret.pc = (uint64_t) (uintptr_t) __builtin_return_address (0);
  35   ret.file.__data = NULL;
  36   ret.file.__length = 0;
  37   ret.line = 0;
  38   ret.ok = 0;
  39
  40   return ret;
  41 }
  42
  43 /* Implement runtime.FuncForPC.  */
  44
  45 void *FuncForPC (uintptr_t) asm ("libgo_runtime.runtime.FuncForPC");
  46
  47 void *
  48 FuncForPC(uintptr_t pc __attribute__ ((unused)))
  49 {
  50   return NULL;
  51 }