libgo/runtime/go-runtime-error.c

   1 /* go-runtime-error.c -- Go runtime error.
   2
   3    Copyright 2010 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 "runtime.h"
   8
   9 /* The compiler generates calls to this function.  This enum values
  10    are known to the compiler and used by compiled code.  Any change
  11    here must be reflected in the compiler.  */
  12
  13 enum
  14 {
  15   /* Slice index out of bounds: negative or larger than the length of
  16      the slice.  */
  17   SLICE_INDEX_OUT_OF_BOUNDS = 0,
  18
  19   /* Array index out of bounds.  */
  20   ARRAY_INDEX_OUT_OF_BOUNDS = 1,
  21
  22   /* String index out of bounds.  */
  23   STRING_INDEX_OUT_OF_BOUNDS = 2,
  24
  25   /* Slice slice out of bounds: negative or larger than the length of
  26      the slice or high bound less than low bound.  */
  27   SLICE_SLICE_OUT_OF_BOUNDS = 3,
  28
  29   /* Array slice out of bounds.  */
  30   ARRAY_SLICE_OUT_OF_BOUNDS = 4,
  31
  32   /* String slice out of bounds.  */
  33   STRING_SLICE_OUT_OF_BOUNDS = 5,
  34
  35   /* Dereference of nil pointer.  This is used when there is a
  36      dereference of a pointer to a very large struct or array, to
  37      ensure that a gigantic array is not used a proxy to access random
  38      memory locations.  */
  39   NIL_DEREFERENCE = 6,
  40
  41   /* Slice length or capacity out of bounds in make: negative or
  42      overflow or length greater than capacity.  */
  43   MAKE_SLICE_OUT_OF_BOUNDS = 7,
  44
  45   /* Map capacity out of bounds in make: negative or overflow.  */
  46   MAKE_MAP_OUT_OF_BOUNDS = 8,
  47
  48   /* Channel capacity out of bounds in make: negative or overflow.  */
  49   MAKE_CHAN_OUT_OF_BOUNDS = 9,
  50
  51   /* Integer division by zero.  */
  52   DIVISION_BY_ZERO = 10,
  53
  54   /* Go statement with nil function.  */
  55   GO_NIL = 11
  56 };
  57
  58 extern void __go_runtime_error (int32) __attribute__ ((noreturn));
  59
  60 void
  61 __go_runtime_error (int32 i)
  62 {
  63   struct funcfileline_return fileline;
  64   bool in_runtime;
  65
  66   fileline = runtime_funcfileline ((uintptr) runtime_getcallerpc(), 0);
  67   in_runtime = (fileline.retfn.len > 0
  68                 && (__builtin_strncmp ((const char *) fileline.retfn.str,
  69                                       "runtime.", 8)
  70                     == 0));
  71
  72   switch (i)
  73     {
  74     case SLICE_INDEX_OUT_OF_BOUNDS:
  75     case ARRAY_INDEX_OUT_OF_BOUNDS:
  76     case STRING_INDEX_OUT_OF_BOUNDS:
  77       if (in_runtime)
  78         runtime_throw ("index out of range");
  79       runtime_panicstring ("index out of range");
  80
  81     case SLICE_SLICE_OUT_OF_BOUNDS:
  82     case ARRAY_SLICE_OUT_OF_BOUNDS:
  83     case STRING_SLICE_OUT_OF_BOUNDS:
  84       if (in_runtime)
  85         runtime_throw ("slice bounds out of range");
  86       runtime_panicstring ("slice bounds out of range");
  87
  88     case NIL_DEREFERENCE:
  89       runtime_panicstring ("nil pointer dereference");
  90
  91     case MAKE_SLICE_OUT_OF_BOUNDS:
  92       runtime_panicstring ("make slice len or cap out of range");
  93
  94     case MAKE_MAP_OUT_OF_BOUNDS:
  95       runtime_panicstring ("make map len out of range");
  96
  97     case MAKE_CHAN_OUT_OF_BOUNDS:
  98       runtime_panicstring ("make chan len out of range");
  99
 100     case DIVISION_BY_ZERO:
 101       runtime_panicstring ("integer divide by zero");
 102
 103     case GO_NIL:
 104       /* This one is a throw, rather than a panic.  Set throwing to
 105          not dump full stacks.  */
 106       runtime_g()->m->throwing = -1;
 107       runtime_throw ("go of nil func value");
 108
 109     default:
 110       runtime_panicstring ("unknown runtime error");
 111     }
 112 }