/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
* Jonathan Schleifer <js@heap.zone>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "config.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_DLFCN_H
# include <dlfcn.h>
#endif
#import "OFException.h"
#import "OFString.h"
#import "OFArray.h"
#import "OFSystemInfo.h"
#import "OFInitializationFailedException.h"
#import "OFLockFailedException.h"
#import "OFUnlockFailedException.h"
#if !defined(HAVE_STRERROR_R) && defined(OF_HAVE_THREADS)
# import "threading.h"
#endif
#if defined(OF_WINDOWS) && defined(OF_HAVE_SOCKETS)
# include <winerror.h>
#endif
/*
* Define HAVE_DWARF_EXCEPTIONS if OBJC_ZEROCOST_EXCEPTIONS is defined, but
* don't do so on iOS, as it is defined there even if SjLj exceptions are used.
*/
#ifndef HAVE_DWARF_EXCEPTIONS
# if defined(OBJC_ZEROCOST_EXCEPTIONS) && !defined(OF_IOS)
# define HAVE_DWARF_EXCEPTIONS
# endif
#endif
/*
* Define HAVE_DWARF_EXCEPTIONS if HAVE_SEH_EXCEPTIONS is defined, as SEH
* exceptions are implemented as a wrapper around DWARF exceptions.
*/
#ifdef HAVE_SEH_EXCEPTIONS
# define HAVE_DWARF_EXCEPTIONS
#endif
#if defined(OF_ARM) && !defined(__ARM_DWARF_EH__)
# define HAVE_ARM_EHABI_EXCEPTIONS
#endif
#ifdef HAVE_DWARF_EXCEPTIONS
struct _Unwind_Context;
typedef enum {
_URC_OK = 0,
_URC_END_OF_STACK = 5
}_Unwind_Reason_Code;
struct backtrace_ctx {
void **backtrace;
uint8_t i;
};
extern _Unwind_Reason_Code _Unwind_Backtrace(
_Unwind_Reason_Code(*)(struct _Unwind_Context*, void*), void*);
# ifndef HAVE_ARM_EHABI_EXCEPTIONS
extern uintptr_t _Unwind_GetIP(struct _Unwind_Context*);
# else
extern int _Unwind_VRS_Get(struct _Unwind_Context*, int, uint32_t, int, void*);
# endif
#endif
#if !defined(HAVE_STRERROR_R) && defined(OF_HAVE_THREADS)
static of_mutex_t mutex;
static void __attribute__((__constructor__))
init(void)
{
if (!of_mutex_new(&mutex))
@throw [OFInitializationFailedException exception];
}
#endif
OFString*
of_strerror(int errNo)
{
OFString *ret;
#ifdef HAVE_STRERROR_R
char buffer[256];
#endif
#ifdef OF_WINDOWS
/*
* These were translated from WSAE* errors to errno and thus Win32's
* strerror_r() does not know about them.
*
* FIXME: These could have better descriptions!
*/
switch (errNo) {
case EADDRINUSE:
return @"EADDRINUSE";
case EADDRNOTAVAIL:
return @"EADDRNOTAVAIL";
case EAFNOSUPPORT:
return @"EAFNOSUPPORT";
case EALREADY:
return @"EALREADY";
case ECONNABORTED:
return @"ECONNABORTED";
case ECONNREFUSED:
return @"ECONNREFUSED";
case ECONNRESET:
return @"ECONNRESET";
case EDESTADDRREQ:
return @"EDESTADDRREQ";
case EDQUOT:
return @"EDQUOT";
case EHOSTDOWN:
return @"EHOSTDOWN";
case EHOSTUNREACH:
return @"EHOSTUNREACH";
case EINPROGRESS:
return @"EINPROGRESS";
case EISCONN:
return @"EISCONN";
case ELOOP:
return @"ELOOP";
case EMSGSIZE:
return @"EMSGSIZE";
case ENETDOWN:
return @"ENETDOWN";
case ENETRESET:
return @"ENETRESET";
case ENETUNREACH:
return @"ENETUNREACH";
case ENOBUFS:
return @"ENOBUFS";
case ENOPROTOOPT:
return @"ENOPROTOOPT";
case ENOTCONN:
return @"ENOTCONN";
case ENOTSOCK:
return @"ENOTSOCK";
case EOPNOTSUPP:
return @"EOPNOTSUPP";
case EPFNOSUPPORT:
return @"EPFNOSUPPORT";
case EPROCLIM:
return @"EPROCLIM";
case EPROTONOSUPPORT:
return @"EPROTONOSUPPORT";
case EPROTOTYPE:
return @"EPROTOTYPE";
case EREMOTE:
return @"EREMOTE";
case ESHUTDOWN:
return @"ESHUTDOWN";
case ESOCKTNOSUPPORT:
return @"ESOCKTNOSUPPORT";
case ESTALE:
return @"ESTALE";
case ETIMEDOUT:
return @"ETIMEDOUT";
case ETOOMANYREFS:
return @"ETOOMANYREFS";
case EUSERS:
return @"EUSERS";
case EWOULDBLOCK:
return @"EWOULDBLOCK";
}
#endif
#ifdef HAVE_STRERROR_R
if (strerror_r(errNo, buffer, 256) != 0)
return @"Unknown error (strerror_r failed)";
ret = [OFString stringWithCString: buffer
encoding: [OFSystemInfo native8BitEncoding]];
#else
# ifdef OF_HAVE_THREADS
if (!of_mutex_lock(&mutex))
@throw [OFLockFailedException exception];
@try {
# endif
ret = [OFString
stringWithCString: strerror(errNo)
encoding: [OFSystemInfo native8BitEncoding]];
# ifdef OF_HAVE_THREADS
} @finally {
if (!of_mutex_unlock(&mutex))
@throw [OFUnlockFailedException exception];
}
# endif
#endif
return ret;
}
#ifdef HAVE_DWARF_EXCEPTIONS
static _Unwind_Reason_Code
backtrace_callback(struct _Unwind_Context *ctx, void *data)
{
struct backtrace_ctx *bt = data;
if (bt->i < OF_BACKTRACE_SIZE) {
# ifndef HAVE_ARM_EHABI_EXCEPTIONS
bt->backtrace[bt->i++] = (void*)_Unwind_GetIP(ctx);
# else
uintptr_t ip;
_Unwind_VRS_Get(ctx, 0, 15, 0, &ip);
bt->backtrace[bt->i++] = (void*)(ip & ~1);
# endif
return _URC_OK;
}
return _URC_END_OF_STACK;
}
#endif
@implementation OFException
+ (instancetype)exception
{
return [[[self alloc] init] autorelease];
}
#ifdef HAVE_DWARF_EXCEPTIONS
- init
{
struct backtrace_ctx ctx;
self = [super init];
ctx.backtrace = _backtrace;
ctx.i = 0;
_Unwind_Backtrace(backtrace_callback, &ctx);
return self;
}
#endif
- (OFString*)description
{
return [OFString stringWithFormat:
@"An exception of type %@ occurred!", [self class]];
}
- (OFArray*)backtrace
{
#ifdef HAVE_DWARF_EXCEPTIONS
OFMutableArray *backtrace = [OFMutableArray array];
void *pool = objc_autoreleasePoolPush();
for (uint8_t i = 0;
i < OF_BACKTRACE_SIZE && _backtrace[i] != NULL; i++) {
# ifdef HAVE_DLADDR
Dl_info info;
if (dladdr(_backtrace[i], &info)) {
OFString *frame;
if (info.dli_sname != NULL) {
ptrdiff_t offset = (char*)_backtrace[i] -
(char*)info.dli_saddr;
frame = [OFString stringWithFormat:
@"%p <%s+%td> at %s",
_backtrace[i], info.dli_sname, offset,
info.dli_fname];
} else
frame = [OFString stringWithFormat:
@"%p <?" @"?> at %s",
_backtrace[i], info.dli_fname];
[backtrace addObject: frame];
} else
# endif
[backtrace addObject:
[OFString stringWithFormat: @"%p", _backtrace[i]]];
}
objc_autoreleasePoolPop(pool);
[backtrace makeImmutable];
return backtrace;
#else
return nil;
#endif
}
@end