[270] | 1 | /*
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| 2 | ** error.c - Exception class
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| 3 | **
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| 4 | ** See Copyright Notice in mruby.h
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| 5 | */
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| 6 |
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| 7 | #include <errno.h>
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| 8 | #include <stdarg.h>
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| 9 | #include <stdlib.h>
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| 10 | #include "mruby.h"
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| 11 | #include "mruby/array.h"
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| 12 | #include "mruby/irep.h"
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| 13 | #include "mruby/proc.h"
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| 14 | #include "mruby/string.h"
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| 15 | #include "mruby/variable.h"
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| 16 | #include "mruby/debug.h"
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| 17 | #include "mruby/error.h"
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| 18 | #include "mruby/class.h"
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| 19 | #include "mruby/throw.h"
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| 20 |
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| 21 | MRB_API mrb_value
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| 22 | mrb_exc_new(mrb_state *mrb, struct RClass *c, const char *ptr, size_t len)
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| 23 | {
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| 24 | mrb_value arg = mrb_str_new(mrb, ptr, len);
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| 25 | return mrb_obj_new(mrb, c, 1, &arg);
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| 26 | }
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| 27 |
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| 28 | MRB_API mrb_value
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| 29 | mrb_exc_new_str(mrb_state *mrb, struct RClass* c, mrb_value str)
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| 30 | {
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| 31 | str = mrb_str_to_str(mrb, str);
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| 32 | return mrb_obj_new(mrb, c, 1, &str);
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| 33 | }
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| 34 |
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| 35 | /*
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| 36 | * call-seq:
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| 37 | * Exception.new(msg = nil) -> exception
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| 38 | *
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| 39 | * Construct a new Exception object, optionally passing in
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| 40 | * a message.
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| 41 | */
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| 42 |
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| 43 | static mrb_value
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| 44 | exc_initialize(mrb_state *mrb, mrb_value exc)
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| 45 | {
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| 46 | mrb_value mesg;
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| 47 |
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| 48 | if (mrb_get_args(mrb, "|o", &mesg) == 1) {
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| 49 | mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "mesg"), mesg);
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| 50 | }
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| 51 | return exc;
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| 52 | }
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| 53 |
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| 54 | /*
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| 55 | * Document-method: exception
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| 56 | *
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| 57 | * call-seq:
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| 58 | * exc.exception(string) -> an_exception or exc
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| 59 | *
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| 60 | * With no argument, or if the argument is the same as the receiver,
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| 61 | * return the receiver. Otherwise, create a new
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| 62 | * exception object of the same class as the receiver, but with a
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| 63 | * message equal to <code>string.to_str</code>.
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| 64 | *
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| 65 | */
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| 66 |
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| 67 | static mrb_value
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| 68 | exc_exception(mrb_state *mrb, mrb_value self)
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| 69 | {
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| 70 | mrb_value exc;
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| 71 | mrb_value a;
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| 72 | int argc;
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| 73 |
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| 74 | argc = mrb_get_args(mrb, "|o", &a);
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| 75 | if (argc == 0) return self;
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| 76 | if (mrb_obj_equal(mrb, self, a)) return self;
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| 77 | exc = mrb_obj_clone(mrb, self);
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| 78 | mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "mesg"), a);
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| 79 |
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| 80 | return exc;
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| 81 | }
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| 82 |
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| 83 | /*
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| 84 | * call-seq:
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| 85 | * exception.to_s -> string
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| 86 | *
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| 87 | * Returns exception's message (or the name of the exception if
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| 88 | * no message is set).
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| 89 | */
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| 90 |
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| 91 | static mrb_value
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| 92 | exc_to_s(mrb_state *mrb, mrb_value exc)
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| 93 | {
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| 94 | mrb_value mesg = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "mesg"));
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| 95 | struct RObject *p;
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| 96 |
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| 97 | if (!mrb_string_p(mesg)) {
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| 98 | return mrb_str_new_cstr(mrb, mrb_obj_classname(mrb, exc));
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| 99 | }
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| 100 | p = mrb_obj_ptr(mesg);
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| 101 | if (!p->c) {
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| 102 | p->c = mrb->string_class;
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| 103 | }
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| 104 | return mesg;
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| 105 | }
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| 106 |
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| 107 | /*
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| 108 | * call-seq:
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| 109 | * exception.message -> string
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| 110 | *
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| 111 | * Returns the result of invoking <code>exception.to_s</code>.
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| 112 | * Normally this returns the exception's message or name. By
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| 113 | * supplying a to_str method, exceptions are agreeing to
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| 114 | * be used where Strings are expected.
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| 115 | */
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| 116 |
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| 117 | static mrb_value
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| 118 | exc_message(mrb_state *mrb, mrb_value exc)
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| 119 | {
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| 120 | return mrb_funcall(mrb, exc, "to_s", 0);
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| 121 | }
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| 122 |
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| 123 | /*
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| 124 | * call-seq:
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| 125 | * exception.inspect -> string
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| 126 | *
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| 127 | * Returns this exception's file name, line number,
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| 128 | * message and class name.
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| 129 | * If file name or line number is not set,
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| 130 | * returns message and class name.
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| 131 | */
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| 132 |
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| 133 | static mrb_value
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| 134 | exc_inspect(mrb_state *mrb, mrb_value exc)
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| 135 | {
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| 136 | mrb_value str, mesg, file, line;
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| 137 | mrb_bool append_mesg;
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| 138 |
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| 139 | mesg = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "mesg"));
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| 140 | file = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "file"));
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| 141 | line = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "line"));
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| 142 |
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| 143 | append_mesg = !mrb_nil_p(mesg);
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| 144 | if (append_mesg) {
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| 145 | mesg = mrb_obj_as_string(mrb, mesg);
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| 146 | append_mesg = RSTRING_LEN(mesg) > 0;
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| 147 | }
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| 148 |
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| 149 | if (!mrb_nil_p(file) && !mrb_nil_p(line)) {
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| 150 | str = mrb_str_dup(mrb, file);
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| 151 | mrb_str_cat_lit(mrb, str, ":");
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| 152 | mrb_str_append(mrb, str, line);
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| 153 | mrb_str_cat_lit(mrb, str, ": ");
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| 154 | if (append_mesg) {
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| 155 | mrb_str_cat_str(mrb, str, mesg);
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| 156 | mrb_str_cat_lit(mrb, str, " (");
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| 157 | }
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| 158 | mrb_str_cat_cstr(mrb, str, mrb_obj_classname(mrb, exc));
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| 159 | if (append_mesg) {
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| 160 | mrb_str_cat_lit(mrb, str, ")");
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| 161 | }
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| 162 | }
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| 163 | else {
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| 164 | const char *cname = mrb_obj_classname(mrb, exc);
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| 165 | str = mrb_str_new_cstr(mrb, cname);
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| 166 | mrb_str_cat_lit(mrb, str, ": ");
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| 167 | if (append_mesg) {
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| 168 | mrb_str_cat_str(mrb, str, mesg);
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| 169 | }
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| 170 | else {
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| 171 | mrb_str_cat_cstr(mrb, str, cname);
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| 172 | }
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| 173 | }
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| 174 | return str;
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| 175 | }
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| 176 |
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| 177 |
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| 178 | static void
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| 179 | exc_debug_info(mrb_state *mrb, struct RObject *exc)
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| 180 | {
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| 181 | mrb_callinfo *ci = mrb->c->ci;
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| 182 | mrb_code *pc = ci->pc;
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| 183 |
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| 184 | mrb_obj_iv_set(mrb, exc, mrb_intern_lit(mrb, "ciidx"), mrb_fixnum_value((mrb_int)(ci - mrb->c->cibase)));
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| 185 | while (ci >= mrb->c->cibase) {
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| 186 | mrb_code *err = ci->err;
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| 187 |
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| 188 | if (!err && pc) err = pc - 1;
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| 189 | if (err && ci->proc && !MRB_PROC_CFUNC_P(ci->proc)) {
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| 190 | mrb_irep *irep = ci->proc->body.irep;
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| 191 |
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| 192 | int32_t const line = mrb_debug_get_line(irep, (uint32_t)(err - irep->iseq));
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| 193 | char const* file = mrb_debug_get_filename(irep, (uint32_t)(err - irep->iseq));
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| 194 | if (line != -1 && file) {
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| 195 | mrb_obj_iv_set(mrb, exc, mrb_intern_lit(mrb, "file"), mrb_str_new_cstr(mrb, file));
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| 196 | mrb_obj_iv_set(mrb, exc, mrb_intern_lit(mrb, "line"), mrb_fixnum_value(line));
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| 197 | return;
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| 198 | }
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| 199 | }
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| 200 | pc = ci->pc;
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| 201 | ci--;
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| 202 | }
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| 203 | }
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| 204 |
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| 205 | MRB_API mrb_noreturn void
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| 206 | mrb_exc_raise(mrb_state *mrb, mrb_value exc)
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| 207 | {
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| 208 | mrb->exc = mrb_obj_ptr(exc);
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| 209 | if (!mrb->gc.out_of_memory) {
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| 210 | exc_debug_info(mrb, mrb->exc);
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| 211 | }
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| 212 | if (!mrb->jmp) {
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| 213 | mrb_p(mrb, exc);
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| 214 | abort();
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| 215 | }
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| 216 | MRB_THROW(mrb->jmp);
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| 217 | }
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| 218 |
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| 219 | MRB_API mrb_noreturn void
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| 220 | mrb_raise(mrb_state *mrb, struct RClass *c, const char *msg)
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| 221 | {
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| 222 | mrb_value mesg;
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| 223 | mesg = mrb_str_new_cstr(mrb, msg);
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| 224 | mrb_exc_raise(mrb, mrb_exc_new_str(mrb, c, mesg));
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| 225 | }
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| 226 |
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| 227 | MRB_API mrb_value
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| 228 | mrb_vformat(mrb_state *mrb, const char *format, va_list ap)
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| 229 | {
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| 230 | const char *p = format;
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| 231 | const char *b = p;
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| 232 | ptrdiff_t size;
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| 233 | mrb_value ary = mrb_ary_new_capa(mrb, 4);
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| 234 |
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| 235 | while (*p) {
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| 236 | const char c = *p++;
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| 237 |
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| 238 | if (c == '%') {
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| 239 | if (*p == 'S') {
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| 240 | size = p - b - 1;
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| 241 | mrb_ary_push(mrb, ary, mrb_str_new(mrb, b, size));
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| 242 | mrb_ary_push(mrb, ary, va_arg(ap, mrb_value));
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| 243 | b = p + 1;
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| 244 | }
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| 245 | }
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| 246 | else if (c == '\\') {
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| 247 | if (*p) {
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| 248 | size = p - b - 1;
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| 249 | mrb_ary_push(mrb, ary, mrb_str_new(mrb, b, size));
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| 250 | mrb_ary_push(mrb, ary, mrb_str_new(mrb, p, 1));
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| 251 | b = ++p;
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| 252 | }
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| 253 | else {
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| 254 | break;
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| 255 | }
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| 256 | }
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| 257 | }
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| 258 | if (b == format) {
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| 259 | return mrb_str_new_cstr(mrb, format);
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| 260 | }
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| 261 | else {
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| 262 | size = p - b;
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| 263 | mrb_ary_push(mrb, ary, mrb_str_new(mrb, b, size));
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| 264 | return mrb_ary_join(mrb, ary, mrb_str_new(mrb, NULL, 0));
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| 265 | }
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| 266 | }
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| 267 |
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| 268 | MRB_API mrb_value
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| 269 | mrb_format(mrb_state *mrb, const char *format, ...)
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| 270 | {
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| 271 | va_list ap;
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| 272 | mrb_value str;
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| 273 |
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| 274 | va_start(ap, format);
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| 275 | str = mrb_vformat(mrb, format, ap);
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| 276 | va_end(ap);
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| 277 |
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| 278 | return str;
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| 279 | }
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| 280 |
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| 281 | MRB_API mrb_noreturn void
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| 282 | mrb_raisef(mrb_state *mrb, struct RClass *c, const char *fmt, ...)
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| 283 | {
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| 284 | va_list args;
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| 285 | mrb_value mesg;
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| 286 |
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| 287 | va_start(args, fmt);
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| 288 | mesg = mrb_vformat(mrb, fmt, args);
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| 289 | va_end(args);
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| 290 | mrb_exc_raise(mrb, mrb_exc_new_str(mrb, c, mesg));
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| 291 | }
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| 292 |
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| 293 | MRB_API mrb_noreturn void
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| 294 | mrb_name_error(mrb_state *mrb, mrb_sym id, const char *fmt, ...)
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| 295 | {
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| 296 | mrb_value exc;
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| 297 | mrb_value argv[2];
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| 298 | va_list args;
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| 299 |
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| 300 | va_start(args, fmt);
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| 301 | argv[0] = mrb_vformat(mrb, fmt, args);
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| 302 | va_end(args);
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| 303 |
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| 304 | argv[1] = mrb_symbol_value(id);
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| 305 | exc = mrb_obj_new(mrb, E_NAME_ERROR, 2, argv);
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| 306 | mrb_exc_raise(mrb, exc);
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| 307 | }
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| 308 |
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| 309 | MRB_API void
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| 310 | mrb_warn(mrb_state *mrb, const char *fmt, ...)
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| 311 | {
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| 312 | #ifndef MRB_DISABLE_STDIO
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| 313 | va_list ap;
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| 314 | mrb_value str;
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| 315 |
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| 316 | va_start(ap, fmt);
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| 317 | str = mrb_vformat(mrb, fmt, ap);
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| 318 | fputs("warning: ", stderr);
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| 319 | fwrite(RSTRING_PTR(str), RSTRING_LEN(str), 1, stderr);
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| 320 | va_end(ap);
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| 321 | #endif
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| 322 | }
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| 323 |
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| 324 | MRB_API mrb_noreturn void
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| 325 | mrb_bug(mrb_state *mrb, const char *fmt, ...)
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| 326 | {
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| 327 | #ifndef MRB_DISABLE_STDIO
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| 328 | va_list ap;
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| 329 | mrb_value str;
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| 330 |
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| 331 | va_start(ap, fmt);
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| 332 | str = mrb_vformat(mrb, fmt, ap);
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| 333 | fputs("bug: ", stderr);
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| 334 | fwrite(RSTRING_PTR(str), RSTRING_LEN(str), 1, stderr);
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| 335 | va_end(ap);
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| 336 | #endif
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| 337 | exit(EXIT_FAILURE);
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| 338 | }
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| 339 |
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| 340 | static void
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| 341 | set_backtrace(mrb_state *mrb, mrb_value info, mrb_value bt)
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| 342 | {
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| 343 | mrb_funcall(mrb, info, "set_backtrace", 1, bt);
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| 344 | }
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| 345 |
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| 346 | static mrb_value
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| 347 | make_exception(mrb_state *mrb, int argc, const mrb_value *argv, mrb_bool isstr)
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| 348 | {
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| 349 | mrb_value mesg;
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| 350 | int n;
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| 351 |
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| 352 | mesg = mrb_nil_value();
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| 353 | switch (argc) {
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| 354 | case 0:
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| 355 | break;
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| 356 | case 1:
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| 357 | if (mrb_nil_p(argv[0]))
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| 358 | break;
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| 359 | if (isstr) {
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| 360 | mesg = mrb_check_string_type(mrb, argv[0]);
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| 361 | if (!mrb_nil_p(mesg)) {
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| 362 | mesg = mrb_exc_new_str(mrb, E_RUNTIME_ERROR, mesg);
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| 363 | break;
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| 364 | }
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| 365 | }
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| 366 | n = 0;
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| 367 | goto exception_call;
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| 368 |
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| 369 | case 2:
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| 370 | case 3:
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| 371 | n = 1;
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| 372 | exception_call:
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| 373 | {
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| 374 | mrb_sym exc = mrb_intern_lit(mrb, "exception");
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| 375 | if (mrb_respond_to(mrb, argv[0], exc)) {
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| 376 | mesg = mrb_funcall_argv(mrb, argv[0], exc, n, argv+1);
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| 377 | }
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| 378 | else {
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| 379 | /* undef */
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| 380 | mrb_raise(mrb, E_TYPE_ERROR, "exception class/object expected");
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| 381 | }
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| 382 | }
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| 383 |
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| 384 | break;
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| 385 | default:
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| 386 | mrb_raisef(mrb, E_ARGUMENT_ERROR, "wrong number of arguments (%S for 0..3)", mrb_fixnum_value(argc));
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| 387 | break;
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| 388 | }
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| 389 | if (argc > 0) {
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| 390 | if (!mrb_obj_is_kind_of(mrb, mesg, mrb->eException_class))
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| 391 | mrb_raise(mrb, E_TYPE_ERROR, "exception object expected");
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| 392 | if (argc > 2)
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| 393 | set_backtrace(mrb, mesg, argv[2]);
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| 394 | }
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| 395 |
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| 396 | return mesg;
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| 397 | }
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| 398 |
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| 399 | MRB_API mrb_value
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| 400 | mrb_make_exception(mrb_state *mrb, int argc, const mrb_value *argv)
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| 401 | {
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| 402 | return make_exception(mrb, argc, argv, TRUE);
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| 403 | }
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| 404 |
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| 405 | MRB_API void
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| 406 | mrb_sys_fail(mrb_state *mrb, const char *mesg)
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| 407 | {
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| 408 | struct RClass *sce;
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| 409 | mrb_int no;
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| 410 |
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| 411 | no = (mrb_int)errno;
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| 412 | if (mrb_class_defined(mrb, "SystemCallError")) {
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| 413 | sce = mrb_class_get(mrb, "SystemCallError");
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| 414 | if (mesg != NULL) {
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| 415 | mrb_funcall(mrb, mrb_obj_value(sce), "_sys_fail", 2, mrb_fixnum_value(no), mrb_str_new_cstr(mrb, mesg));
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| 416 | }
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| 417 | else {
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| 418 | mrb_funcall(mrb, mrb_obj_value(sce), "_sys_fail", 1, mrb_fixnum_value(no));
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| 419 | }
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| 420 | }
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| 421 | else {
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| 422 | mrb_raise(mrb, E_RUNTIME_ERROR, mesg);
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| 423 | }
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| 424 | }
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| 425 |
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| 426 | MRB_API mrb_noreturn void
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| 427 | mrb_no_method_error(mrb_state *mrb, mrb_sym id, mrb_value args, char const* fmt, ...)
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| 428 | {
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| 429 | mrb_value exc;
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| 430 | va_list ap;
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| 431 |
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| 432 | va_start(ap, fmt);
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| 433 | exc = mrb_funcall(mrb, mrb_obj_value(E_NOMETHOD_ERROR), "new", 3,
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| 434 | mrb_vformat(mrb, fmt, ap), mrb_symbol_value(id), args);
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| 435 | va_end(ap);
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| 436 | mrb_exc_raise(mrb, exc);
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| 437 | }
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| 438 |
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| 439 | void
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| 440 | mrb_init_exception(mrb_state *mrb)
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| 441 | {
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| 442 | struct RClass *exception, *runtime_error, *script_error;
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| 443 |
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| 444 | mrb->eException_class = exception = mrb_define_class(mrb, "Exception", mrb->object_class); /* 15.2.22 */
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| 445 | MRB_SET_INSTANCE_TT(exception, MRB_TT_EXCEPTION);
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| 446 | mrb_define_class_method(mrb, exception, "exception", mrb_instance_new, MRB_ARGS_ANY());
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| 447 | mrb_define_method(mrb, exception, "exception", exc_exception, MRB_ARGS_ANY());
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| 448 | mrb_define_method(mrb, exception, "initialize", exc_initialize, MRB_ARGS_ANY());
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| 449 | mrb_define_method(mrb, exception, "to_s", exc_to_s, MRB_ARGS_NONE());
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| 450 | mrb_define_method(mrb, exception, "message", exc_message, MRB_ARGS_NONE());
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| 451 | mrb_define_method(mrb, exception, "inspect", exc_inspect, MRB_ARGS_NONE());
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| 452 | mrb_define_method(mrb, exception, "backtrace", mrb_exc_backtrace, MRB_ARGS_NONE());
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| 453 |
|
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| 454 | mrb->eStandardError_class = mrb_define_class(mrb, "StandardError", mrb->eException_class); /* 15.2.23 */
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| 455 | runtime_error = mrb_define_class(mrb, "RuntimeError", mrb->eStandardError_class); /* 15.2.28 */
|
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| 456 | mrb->nomem_err = mrb_obj_ptr(mrb_exc_new_str_lit(mrb, runtime_error, "Out of memory"));
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| 457 | script_error = mrb_define_class(mrb, "ScriptError", mrb->eException_class); /* 15.2.37 */
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| 458 | mrb_define_class(mrb, "SyntaxError", script_error); /* 15.2.38 */
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| 459 | mrb_define_class(mrb, "SystemStackError", exception);
|
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| 460 | }
|
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