ObjFW  OFException.m at [6dcd43ed6c]

File src/exceptions/OFException.m artifact 03e1d50c2c part of check-in 6dcd43ed6c

/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * 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"

#define _GNU_SOURCE

#include <stdlib.h>

#ifdef HAVE_DLFCN_H
# include <dlfcn.h>
#endif

#import "OFException.h"
#import "OFString.h"
#import "OFArray.h"

#import "autorelease.h"

#if defined(_WIN32) && defined(OF_HAVE_SOCKETS)
# include <errno.h>
# include <winerror.h>
#endif

#if defined(HAVE_DWARF_EXCEPTIONS) || defined(OBJC_ZEROCOST_EXCEPTIONS)
struct _Unwind_Context;
typedef enum {
	_URC_OK		  = 0,
	_URC_END_OF_STACK = 5
}_Unwind_Reason_Code;

struct backtrace_ctx {
	void **backtrace;
	uint_fast8_t i;
};

extern _Unwind_Reason_Code _Unwind_Backtrace(
    _Unwind_Reason_Code(*)(struct _Unwind_Context*, void*), void*);
# if defined(__arm__) || defined(__ARM__)
extern int _Unwind_VRS_Get(struct _Unwind_Context*, int, uint32_t, int, void*);
# else
extern uintptr_t _Unwind_GetIP(struct _Unwind_Context*);
# endif

static _Unwind_Reason_Code
backtrace_callback(struct _Unwind_Context *ctx, void *data)
{
	struct backtrace_ctx *bt = data;

	if (bt->i < OF_BACKTRACE_SIZE) {
# if defined(__arm__) || defined(__ARM__)
		uintptr_t ip;

		_Unwind_VRS_Get(ctx, 0, 15, 0, &ip);
		bt->backtrace[bt->i++] = (void*)(ip & ~1);
# else
		bt->backtrace[bt->i++] = (void*)_Unwind_GetIP(ctx);
# endif
		return _URC_OK;
	}

	return _URC_END_OF_STACK;
}
#endif

#if defined(_WIN32) && defined(OF_HAVE_SOCKETS)
int
of_wsaerr_to_errno(int wsaerr)
{
	switch (wsaerr) {
	case WSAEACCES:
		return EACCES;
	case WSAEBADF:
		return EBADF;
	case WSAEDISCON:
		return EPIPE;
	case WSAEFAULT:
		return EFAULT;
	case WSAEINTR:
		return EINTR;
	case WSAEINVAL:
		return EINVAL;
	case WSAENAMETOOLONG:
		return ENAMETOOLONG;
	case WSAENOTEMPTY:
		return ENOTEMPTY;
	case WSAEWOULDBLOCK:
		return EAGAIN;
	default:
		return wsaerr;
	}
}
#endif

@implementation OFException
+ (instancetype)exception
{
	return [[[self alloc] init] autorelease];
}

#if defined(HAVE_DWARF_EXCEPTIONS) || defined(OBJC_ZEROCOST_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
{
#if defined(HAVE_DWARF_EXCEPTIONS) || defined(OBJC_ZEROCOST_EXCEPTIONS)
	OFMutableArray *backtrace = [OFMutableArray array];
	void *pool = objc_autoreleasePoolPush();
	uint_fast8_t i;

	for (i = 0; i < OF_BACKTRACE_SIZE && _backtrace[i] != NULL; i++) {
# ifdef HAVE_DLADDR
		Dl_info info;

		if (dladdr(_backtrace[i], &info)) {
			ptrdiff_t offset = (char*)_backtrace[i] -
			    (char*)info.dli_saddr;

			if (info.dli_sname == NULL)
				info.dli_sname = "??";

			[backtrace addObject:
			    [OFString stringWithFormat: @"%p <%s+%td> at %s",
							_backtrace[i],
							info.dli_sname, offset,
							info.dli_fname]];
		} else
# endif
			[backtrace addObject:
			    [OFString stringWithFormat: @"%p", _backtrace[i]]];
	}

	objc_autoreleasePoolPop(pool);

	[backtrace makeImmutable];

	return backtrace;
#else
	return nil;
#endif
}
@end