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error.c
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error.c
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/**********************************************************************
error.c -
$Author$
$Date$
created at: Mon Aug 9 16:11:34 JST 1993
Copyright (C) 1993-2003 Yukihiro Matsumoto
**********************************************************************/
#include "ruby.h"
#include "env.h"
#include "st.h"
#include <stdio.h>
#ifdef HAVE_STDARG_PROTOTYPES
#include <stdarg.h>
#define va_init_list(a,b) va_start(a,b)
#else
#include <varargs.h>
#define va_init_list(a,b) va_start(a)
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif
extern const char *ruby_description;
int ruby_nerrs;
static int
err_position(buf, len)
char *buf;
long len;
{
ruby_set_current_source();
if (!ruby_sourcefile) {
return 0;
}
else if (ruby_sourceline == 0) {
return snprintf(buf, len, "%s: ", ruby_sourcefile);
}
else {
return snprintf(buf, len, "%s:%d: ", ruby_sourcefile, ruby_sourceline);
}
}
static void
err_snprintf(buf, len, fmt, args)
char *buf;
long len;
const char *fmt;
va_list args;
{
long n;
n = err_position(buf, len);
if (len > n) {
vsnprintf((char*)buf+n, len-n, fmt, args);
}
}
static void err_append _((const char*));
static void
err_print(fmt, args)
const char *fmt;
va_list args;
{
char buf[BUFSIZ];
err_snprintf(buf, BUFSIZ, fmt, args);
err_append(buf);
}
void
#ifdef HAVE_STDARG_PROTOTYPES
rb_compile_error(const char *fmt, ...)
#else
rb_compile_error(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
va_list args;
va_init_list(args, fmt);
err_print(fmt, args);
va_end(args);
ruby_nerrs++;
}
void
#ifdef HAVE_STDARG_PROTOTYPES
rb_compile_error_append(const char *fmt, ...)
#else
rb_compile_error_append(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
va_list args;
char buf[BUFSIZ];
va_init_list(args, fmt);
vsnprintf(buf, BUFSIZ, fmt, args);
va_end(args);
err_append(buf);
}
static void
warn_print(fmt, args)
const char *fmt;
va_list args;
{
char buf[BUFSIZ];
int len;
err_snprintf(buf, BUFSIZ, fmt, args);
len = strlen(buf);
buf[len++] = '\n';
rb_write_error2(buf, len);
}
void
#ifdef HAVE_STDARG_PROTOTYPES
rb_warn(const char *fmt, ...)
#else
rb_warn(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
char buf[BUFSIZ];
va_list args;
if (NIL_P(ruby_verbose)) return;
snprintf(buf, BUFSIZ, "warning: %s", fmt);
va_init_list(args, fmt);
warn_print(buf, args);
va_end(args);
}
/* rb_warning() reports only in verbose mode */
void
#ifdef HAVE_STDARG_PROTOTYPES
rb_warning(const char *fmt, ...)
#else
rb_warning(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
char buf[BUFSIZ];
va_list args;
if (!RTEST(ruby_verbose)) return;
snprintf(buf, BUFSIZ, "warning: %s", fmt);
va_init_list(args, fmt);
warn_print(buf, args);
va_end(args);
}
/*
* call-seq:
* warn(msg) => nil
*
* Display the given message (followed by a newline) on STDERR unless
* warnings are disabled (for example with the <code>-W0</code> flag).
*/
static VALUE
rb_warn_m(self, mesg)
VALUE self, mesg;
{
if (!NIL_P(ruby_verbose)) {
rb_io_write(rb_stderr, mesg);
rb_io_write(rb_stderr, rb_default_rs);
}
return Qnil;
}
void
#ifdef HAVE_STDARG_PROTOTYPES
rb_bug(const char *fmt, ...)
#else
rb_bug(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
char buf[BUFSIZ];
va_list args;
FILE *out = stderr;
int len = err_position(buf, BUFSIZ);
if (fwrite(buf, 1, len, out) == len ||
fwrite(buf, 1, len, (out = stdout)) == len) {
fputs("[BUG] ", out);
va_init_list(args, fmt);
vfprintf(out, fmt, args);
va_end(args);
fprintf(out, "\n%s\n\n", ruby_description);
}
abort();
}
static struct types {
int type;
const char *name;
} builtin_types[] = {
{T_NIL, "nil"},
{T_OBJECT, "Object"},
{T_CLASS, "Class"},
{T_ICLASS, "iClass"}, /* internal use: mixed-in module holder */
{T_MODULE, "Module"},
{T_FLOAT, "Float"},
{T_STRING, "String"},
{T_REGEXP, "Regexp"},
{T_ARRAY, "Array"},
{T_FIXNUM, "Fixnum"},
{T_HASH, "Hash"},
{T_STRUCT, "Struct"},
{T_BIGNUM, "Bignum"},
{T_FILE, "File"},
{T_TRUE, "true"},
{T_FALSE, "false"},
{T_SYMBOL, "Symbol"}, /* :symbol */
{T_DATA, "Data"}, /* internal use: wrapped C pointers */
{T_MATCH, "MatchData"}, /* data of $~ */
{T_VARMAP, "Varmap"}, /* internal use: dynamic variables */
{T_SCOPE, "Scope"}, /* internal use: variable scope */
{T_NODE, "Node"}, /* internal use: syntax tree node */
{T_UNDEF, "undef"}, /* internal use: #undef; should not happen */
{-1, 0}
};
void
rb_check_type(x, t)
VALUE x;
int t;
{
struct types *type = builtin_types;
if (x == Qundef) {
rb_bug("undef leaked to the Ruby space");
}
if (TYPE(x) != t) {
while (type->type >= 0) {
if (type->type == t) {
const char *etype;
if (NIL_P(x)) {
etype = "nil";
}
else if (FIXNUM_P(x)) {
etype = "Fixnum";
}
else if (SYMBOL_P(x)) {
etype = "Symbol";
}
else if (rb_special_const_p(x)) {
etype = RSTRING(rb_obj_as_string(x))->ptr;
}
else {
etype = rb_obj_classname(x);
}
rb_raise(rb_eTypeError, "wrong argument type %s (expected %s)",
etype, type->name);
}
type++;
}
rb_bug("unknown type 0x%x", t);
}
}
/* exception classes */
#include <errno.h>
VALUE rb_eException;
VALUE rb_eSystemExit;
VALUE rb_eInterrupt;
VALUE rb_eSignal;
VALUE rb_eFatal;
VALUE rb_eStandardError;
VALUE rb_eRuntimeError;
VALUE rb_eTypeError;
VALUE rb_eArgError;
VALUE rb_eIndexError;
VALUE rb_eRangeError;
VALUE rb_eNameError;
VALUE rb_eNoMethodError;
VALUE rb_eSecurityError;
VALUE rb_eNotImpError;
VALUE rb_eNoMemError;
VALUE rb_cNameErrorMesg;
VALUE rb_eScriptError;
VALUE rb_eSyntaxError;
VALUE rb_eLoadError;
VALUE rb_eSystemCallError;
VALUE rb_mErrno;
VALUE
rb_exc_new(etype, ptr, len)
VALUE etype;
const char *ptr;
long len;
{
return rb_funcall(etype, rb_intern("new"), 1, rb_str_new(ptr, len));
}
VALUE
rb_exc_new2(etype, s)
VALUE etype;
const char *s;
{
return rb_exc_new(etype, s, strlen(s));
}
VALUE
rb_exc_new3(etype, str)
VALUE etype, str;
{
StringValue(str);
return rb_funcall(etype, rb_intern("new"), 1, str);
}
/*
* call-seq:
* Exception.new(msg = nil) => exception
*
* Construct a new Exception object, optionally passing in
* a message.
*/
static VALUE
exc_initialize(argc, argv, exc)
int argc;
VALUE *argv;
VALUE exc;
{
VALUE arg;
rb_scan_args(argc, argv, "01", &arg);
rb_iv_set(exc, "mesg", arg);
rb_iv_set(exc, "bt", Qnil);
return exc;
}
/*
* Document-method: exception
*
* call-seq:
* exc.exception(string) -> an_exception or exc
*
* With no argument, or if the argument is the same as the receiver,
* return the receiver. Otherwise, create a new
* exception object of the same class as the receiver, but with a
* message equal to <code>string.to_str</code>.
*
*/
static VALUE
exc_exception(argc, argv, self)
int argc;
VALUE *argv;
VALUE self;
{
VALUE exc;
if (argc == 0) return self;
if (argc == 1 && self == argv[0]) return self;
exc = rb_obj_clone(self);
exc_initialize(argc, argv, exc);
return exc;
}
/*
* call-seq:
* exception.to_s => string
*
* Returns exception's message (or the name of the exception if
* no message is set).
*/
static VALUE
exc_to_s(exc)
VALUE exc;
{
VALUE mesg = rb_attr_get(exc, rb_intern("mesg"));
if (NIL_P(mesg)) return rb_class_name(CLASS_OF(exc));
if (OBJ_TAINTED(exc)) OBJ_TAINT(mesg);
return mesg;
}
/*
* call-seq:
* exception.message => string
* exception.to_str => string
*
* Returns the result of invoking <code>exception.to_s</code>.
* Normally this returns the exception's message or name. By
* supplying a to_str method, exceptions are agreeing to
* be used where Strings are expected.
*/
static VALUE
exc_to_str(exc)
VALUE exc;
{
return rb_funcall(exc, rb_intern("to_s"), 0, 0);
}
/*
* call-seq:
* exception.inspect => string
*
* Return this exception's class name an message
*/
static VALUE
exc_inspect(exc)
VALUE exc;
{
VALUE str, klass;
klass = CLASS_OF(exc);
exc = rb_obj_as_string(exc);
if (RSTRING(exc)->len == 0) {
return rb_str_dup(rb_class_name(klass));
}
str = rb_str_buf_new2("#<");
klass = rb_class_name(klass);
rb_str_buf_append(str, klass);
rb_str_buf_cat(str, ": ", 2);
rb_str_buf_append(str, exc);
rb_str_buf_cat(str, ">", 1);
return str;
}
/*
* call-seq:
* exception.backtrace => array
*
* Returns any backtrace associated with the exception. The backtrace
* is an array of strings, each containing either ``filename:lineNo: in
* `method''' or ``filename:lineNo.''
*
* def a
* raise "boom"
* end
*
* def b
* a()
* end
*
* begin
* b()
* rescue => detail
* print detail.backtrace.join("\n")
* end
*
* <em>produces:</em>
*
* prog.rb:2:in `a'
* prog.rb:6:in `b'
* prog.rb:10
*/
static VALUE
exc_backtrace(exc)
VALUE exc;
{
static ID bt;
if (!bt) bt = rb_intern("bt");
return rb_attr_get(exc, bt);
}
VALUE
rb_check_backtrace(bt)
VALUE bt;
{
long i;
static const char err[] = "backtrace must be Array of String";
if (!NIL_P(bt)) {
int t = TYPE(bt);
if (t == T_STRING) return rb_ary_new3(1, bt);
if (t != T_ARRAY) {
rb_raise(rb_eTypeError, err);
}
for (i=0;i<RARRAY(bt)->len;i++) {
if (TYPE(RARRAY(bt)->ptr[i]) != T_STRING) {
rb_raise(rb_eTypeError, err);
}
}
}
return bt;
}
/*
* call-seq:
* exc.set_backtrace(array) => array
*
* Sets the backtrace information associated with <i>exc</i>. The
* argument must be an array of <code>String</code> objects in the
* format described in <code>Exception#backtrace</code>.
*
*/
static VALUE
exc_set_backtrace(exc, bt)
VALUE exc;
VALUE bt;
{
return rb_iv_set(exc, "bt", rb_check_backtrace(bt));
}
/*
* call-seq:
* SystemExit.new(status=0) => system_exit
*
* Create a new +SystemExit+ exception with the given status.
*/
static VALUE
exit_initialize(argc, argv, exc)
int argc;
VALUE *argv;
VALUE exc;
{
VALUE status = INT2FIX(EXIT_SUCCESS);
if (argc > 0 && FIXNUM_P(argv[0])) {
status = *argv++;
--argc;
}
rb_call_super(argc, argv);
rb_iv_set(exc, "status", status);
return exc;
}
/*
* call-seq:
* system_exit.status => fixnum
*
* Return the status value associated with this system exit.
*/
static VALUE
exit_status(exc)
VALUE exc;
{
return rb_attr_get(exc, rb_intern("status"));
}
/*
* call-seq:
* system_exit.success? => true or false
*
* Returns +true+ if exiting successful, +false+ if not.
*/
static VALUE
exit_success_p(exc)
VALUE exc;
{
VALUE status = rb_attr_get(exc, rb_intern("status"));
if (NIL_P(status)) return Qtrue;
if (status == INT2FIX(EXIT_SUCCESS)) return Qtrue;
return Qfalse;
}
void
#ifdef HAVE_STDARG_PROTOTYPES
rb_name_error(ID id, const char *fmt, ...)
#else
rb_name_error(id, fmt, va_alist)
ID id;
const char *fmt;
va_dcl
#endif
{
VALUE exc, argv[2];
va_list args;
char buf[BUFSIZ];
va_init_list(args, fmt);
vsnprintf(buf, BUFSIZ, fmt, args);
va_end(args);
argv[0] = rb_str_new2(buf);
argv[1] = ID2SYM(id);
exc = rb_class_new_instance(2, argv, rb_eNameError);
rb_exc_raise(exc);
}
/*
* call-seq:
* NameError.new(msg [, name]) => name_error
*
* Construct a new NameError exception. If given the <i>name</i>
* parameter may subsequently be examined using the <code>NameError.name</code>
* method.
*/
static VALUE
name_err_initialize(argc, argv, self)
int argc;
VALUE *argv;
VALUE self;
{
VALUE name;
name = (argc > 1) ? argv[--argc] : Qnil;
rb_call_super(argc, argv);
rb_iv_set(self, "name", name);
return self;
}
/*
* call-seq:
* name_error.name => string or nil
*
* Return the name associated with this NameError exception.
*/
static VALUE
name_err_name(self)
VALUE self;
{
return rb_attr_get(self, rb_intern("name"));
}
/*
* call-seq:
* name_error.to_s => string
*
* Produce a nicely-formated string representing the +NameError+.
*/
static VALUE
name_err_to_s(exc)
VALUE exc;
{
VALUE mesg = rb_attr_get(exc, rb_intern("mesg")), str = mesg;
if (NIL_P(mesg)) return rb_class_name(CLASS_OF(exc));
StringValue(str);
if (str != mesg) {
rb_iv_set(exc, "mesg", mesg = str);
}
if (OBJ_TAINTED(exc)) OBJ_TAINT(mesg);
return mesg;
}
/*
* call-seq:
* NoMethodError.new(msg, name [, args]) => no_method_error
*
* Construct a NoMethodError exception for a method of the given name
* called with the given arguments. The name may be accessed using
* the <code>#name</code> method on the resulting object, and the
* arguments using the <code>#args</code> method.
*/
static VALUE
nometh_err_initialize(argc, argv, self)
int argc;
VALUE *argv;
VALUE self;
{
VALUE args = (argc > 2) ? argv[--argc] : Qnil;
name_err_initialize(argc, argv, self);
rb_iv_set(self, "args", args);
return self;
}
/* :nodoc: */
static void
name_err_mesg_mark(ptr)
VALUE *ptr;
{
rb_gc_mark_locations(ptr, ptr+3);
}
/* :nodoc: */
static VALUE
name_err_mesg_new(obj, mesg, recv, method)
VALUE obj, mesg, recv, method;
{
VALUE *ptr = ALLOC_N(VALUE, 3);
ptr[0] = mesg;
ptr[1] = recv;
ptr[2] = method;
return Data_Wrap_Struct(rb_cNameErrorMesg, name_err_mesg_mark, -1, ptr);
}
/* :nodoc: */
static VALUE
name_err_mesg_to_str(obj)
VALUE obj;
{
VALUE *ptr, mesg;
Data_Get_Struct(obj, VALUE, ptr);
mesg = ptr[0];
if (NIL_P(mesg)) return Qnil;
else {
const char *desc = 0;
VALUE d = 0, args[3];
obj = ptr[1];
switch (TYPE(obj)) {
case T_NIL:
desc = "nil";
break;
case T_TRUE:
desc = "true";
break;
case T_FALSE:
desc = "false";
break;
default:
d = rb_protect(rb_inspect, obj, 0);
if (NIL_P(d) || RSTRING(d)->len > 65) {
d = rb_any_to_s(obj);
}
desc = RSTRING(d)->ptr;
break;
}
if (desc && desc[0] != '#') {
d = rb_str_new2(desc);
rb_str_cat2(d, ":");
rb_str_cat2(d, rb_obj_classname(obj));
}
args[0] = mesg;
args[1] = ptr[2];
args[2] = d;
mesg = rb_f_sprintf(3, args);
}
if (OBJ_TAINTED(obj)) OBJ_TAINT(mesg);
return mesg;
}
/* :nodoc: */
static VALUE
name_err_mesg_load(klass, str)
VALUE klass, str;
{
return str;
}
/*
* call-seq:
* no_method_error.args => obj
*
* Return the arguments passed in as the third parameter to
* the constructor.
*/
static VALUE
nometh_err_args(self)
VALUE self;
{
return rb_attr_get(self, rb_intern("args"));
}
void
rb_invalid_str(str, type)
const char *str, *type;
{
VALUE s = rb_str_inspect(rb_str_new2(str));
rb_raise(rb_eArgError, "invalid value for %s: %s", type, RSTRING(s)->ptr);
}
/*
* Document-module: Errno
*
* Ruby exception objects are subclasses of <code>Exception</code>.
* However, operating systems typically report errors using plain
* integers. Module <code>Errno</code> is created dynamically to map
* these operating system errors to Ruby classes, with each error
* number generating its own subclass of <code>SystemCallError</code>.
* As the subclass is created in module <code>Errno</code>, its name
* will start <code>Errno::</code>.
*
* The names of the <code>Errno::</code> classes depend on
* the environment in which Ruby runs. On a typical Unix or Windows
* platform, there are <code>Errno</code> classes such as
* <code>Errno::EACCES</code>, <code>Errno::EAGAIN</code>,
* <code>Errno::EINTR</code>, and so on.
*
* The integer operating system error number corresponding to a
* particular error is available as the class constant
* <code>Errno::</code><em>error</em><code>::Errno</code>.
*
* Errno::EACCES::Errno #=> 13
* Errno::EAGAIN::Errno #=> 11
* Errno::EINTR::Errno #=> 4
*
* The full list of operating system errors on your particular platform
* are available as the constants of <code>Errno</code>.
*
* Errno.constants #=> E2BIG, EACCES, EADDRINUSE, EADDRNOTAVAIL, ...
*/
static st_table *syserr_tbl;
static VALUE
set_syserr(n, name)
int n;
const char *name;
{
VALUE error;
if (!st_lookup(syserr_tbl, n, &error)) {
error = rb_define_class_under(rb_mErrno, name, rb_eSystemCallError);
rb_define_const(error, "Errno", INT2NUM(n));
st_add_direct(syserr_tbl, n, error);
}
else {
rb_define_const(rb_mErrno, name, error);
}
return error;
}
static VALUE
get_syserr(n)
int n;
{
VALUE error;
if (!st_lookup(syserr_tbl, n, &error)) {
char name[8]; /* some Windows' errno have 5 digits. */
snprintf(name, sizeof(name), "E%03d", n);
error = set_syserr(n, name);
}
return error;
}
/*
* call-seq:
* SystemCallError.new(msg, errno) => system_call_error_subclass
*
* If _errno_ corresponds to a known system error code, constructs
* the appropriate <code>Errno</code> class for that error, otherwise
* constructs a generic <code>SystemCallError</code> object. The
* error number is subsequently available via the <code>errno</code>
* method.
*/
static VALUE
syserr_initialize(argc, argv, self)
int argc;
VALUE *argv;
VALUE self;
{
#if !defined(_WIN32) && !defined(__VMS)
char *strerror();
#endif
const char *err;
VALUE mesg, error;
VALUE klass = rb_obj_class(self);
if (klass == rb_eSystemCallError) {
rb_scan_args(argc, argv, "11", &mesg, &error);
if (argc == 1 && FIXNUM_P(mesg)) {
error = mesg; mesg = Qnil;
}
if (!NIL_P(error) && st_lookup(syserr_tbl, NUM2LONG(error), &klass)) {
/* change class */
if (TYPE(self) != T_OBJECT) { /* insurance to avoid type crash */
rb_raise(rb_eTypeError, "invalid instance type");
}
RBASIC(self)->klass = klass;
}
}
else {
rb_scan_args(argc, argv, "01", &mesg);
error = rb_const_get(klass, rb_intern("Errno"));
}
if (!NIL_P(error)) err = strerror(NUM2LONG(error));
else err = "unknown error";
if (!NIL_P(mesg)) {
VALUE str = mesg;
size_t len;
StringValue(str);
len = strlen(err)+RSTRING(str)->len+3;
mesg = rb_str_new(0, len);
snprintf(RSTRING(mesg)->ptr, len+1, "%s - %.*s", err,
(int)RSTRING(str)->len, RSTRING(str)->ptr);
rb_str_resize(mesg, strlen(RSTRING(mesg)->ptr));
}
else {
mesg = rb_str_new2(err);
}
rb_call_super(1, &mesg);
rb_iv_set(self, "errno", error);
return self;
}
/*
* call-seq:
* system_call_error.errno => fixnum
*
* Return this SystemCallError's error number.
*/
static VALUE
syserr_errno(self)
VALUE self;
{
return rb_attr_get(self, rb_intern("errno"));
}
/*
* call-seq:
* system_call_error === other => true or false
*
* Return +true+ if the receiver is a generic +SystemCallError+, or
* if the error numbers _self_ and _other_ are the same.
*/
static VALUE
syserr_eqq(self, exc)
VALUE self, exc;
{
VALUE num, e;
ID en = rb_intern("errno");
if (!rb_obj_is_kind_of(exc, rb_eSystemCallError)) {
if (!rb_respond_to(exc, en)) return Qfalse;
}
else if (self == rb_eSystemCallError) return Qtrue;
num = rb_attr_get(exc, en);
if (NIL_P(num)) {
num = rb_funcall(exc, en, 0, 0);
}
e = rb_const_get(self, rb_intern("Errno"));
if (FIXNUM_P(num) ? num == e : rb_equal(num, e))
return Qtrue;
return Qfalse;
}
/*
* Descendents of class <code>Exception</code> are used to communicate
* between <code>raise</code> methods and <code>rescue</code>
* statements in <code>begin/end</code> blocks. <code>Exception</code>
* objects carry information about the exception---its type (the
* exception's class name), an optional descriptive string, and
* optional traceback information. Programs may subclass
* <code>Exception</code> to add additional information.
*/
void
Init_Exception()
{
rb_eException = rb_define_class("Exception", rb_cObject);
rb_define_singleton_method(rb_eException, "exception", rb_class_new_instance, -1);
rb_define_method(rb_eException, "exception", exc_exception, -1);
rb_define_method(rb_eException, "initialize", exc_initialize, -1);
rb_define_method(rb_eException, "to_s", exc_to_s, 0);
rb_define_method(rb_eException, "to_str", exc_to_str, 0);
rb_define_method(rb_eException, "message", exc_to_str, 0);
rb_define_method(rb_eException, "inspect", exc_inspect, 0);
rb_define_method(rb_eException, "backtrace", exc_backtrace, 0);
rb_define_method(rb_eException, "set_backtrace", exc_set_backtrace, 1);
rb_eSystemExit = rb_define_class("SystemExit", rb_eException);
rb_define_method(rb_eSystemExit, "initialize", exit_initialize, -1);
rb_define_method(rb_eSystemExit, "status", exit_status, 0);
rb_define_method(rb_eSystemExit, "success?", exit_success_p, 0);
rb_eFatal = rb_define_class("fatal", rb_eException);