ObjFW  Check-in [259f593244]

Overview
Comment:Use _Unwind_Backtrace() to get a backtrace.

With this, neither the buggy __builtin_return_address() nor the GNU-only
backtrace() are required for a backtrace.

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SHA3-256: 259f59324452f3188ad0bef03d85fbcdb6b3d0017c37568c7e6c7a9b5fa24176
User & Date: js on 2013-06-11 22:55:07
Other Links: manifest | tags
Context
2013-06-11
23:33
Initial sockets support for the Wii. check-in: ffb91daffe user: js tags: trunk
22:55
Use _Unwind_Backtrace() to get a backtrace. check-in: 259f593244 user: js tags: trunk
2013-06-03
21:38
OFException: Cleaner way to check architecture. check-in: 42ed7e394c user: js tags: trunk
Changes

Modified configure.ac from [c5958dcc8b] to [538d135f42].

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		;;
esac
AS_IF([test x"$have_processes" = x"yes"], [
	AC_SUBST(OFPROCESS_M, "OFProcess.m")
	AC_DEFINE(OF_HAVE_PROCESSES, 1, [Whether we have processes])
])

AC_DEFUN([CHECK_BUILTIN_RETURN_ADDRESS], [
	AC_MSG_CHECKING(for working __builtin_return_address)
	AC_TRY_LINK([
		#if defined(__ppc__) || defined(__PPC__)
		/* __builtin_return_address() is known to work correctly */
		#else
		# error
		#endif
	], [
		__builtin_return_address(1);
	], [
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_BUILTIN_RETURN_ADDRESS, 1,
			[Whether we have __builtin_return_address])
	], [
		AC_MSG_RESULT(no)
	])
])
AC_CHECK_HEADER(execinfo.h, [
	AC_DEFINE(HAVE_EXECINFO_H, 1, [Whether we have execinfo.h])
	AC_CHECK_FUNC(backtrace, [
		AC_DEFINE(HAVE_BACKTRACE, 1, [Whether we have backtrace()])
	], [
		CHECK_BUILTIN_RETURN_ADDRESS
	])
], [
	CHECK_BUILTIN_RETURN_ADDRESS
])

AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
	AC_CHECK_HEADER(Foundation/NSObject.h, [
		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
		AC_SUBST(BRIDGE, "bridge")

		AS_IF([test x"$enable_shared" != x"no"], [
			AC_SUBST(OBJFW_BRIDGE_SHARED_LIB,







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		;;
esac
AS_IF([test x"$have_processes" = x"yes"], [
	AC_SUBST(OFPROCESS_M, "OFProcess.m")
	AC_DEFINE(OF_HAVE_PROCESSES, 1, [Whether we have processes])
])






























AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
	AC_CHECK_HEADER(Foundation/NSObject.h, [
		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
		AC_SUBST(BRIDGE, "bridge")

		AS_IF([test x"$enable_shared" != x"no"], [
			AC_SUBST(OBJFW_BRIDGE_SHARED_LIB,

Modified src/exceptions/OFException.h from [3edc7f9b6e] to [cc67cf334c].

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#import "OFObject.h"

@class OFString;
@class OFArray;
@class OFMutableArray;



/*!
 * @brief The base class for all exceptions in ObjFW
 *
 * The OFException class is the base class for all exceptions in ObjFW, except
 * the OFAllocFailedException.
 */
@interface OFException: OFObject
{
	Class _inClass;
	void *_backtrace[32];
	int _backtraceSize;
}

#ifdef OF_HAVE_PROPERTIES
@property (readonly) Class inClass;
#endif

/*!







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#import "OFObject.h"

@class OFString;
@class OFArray;
@class OFMutableArray;

#define OF_BACKTRACE_SIZE 32

/*!
 * @brief The base class for all exceptions in ObjFW
 *
 * The OFException class is the base class for all exceptions in ObjFW, except
 * the OFAllocFailedException.
 */
@interface OFException: OFObject
{
	Class _inClass;
	void *_backtrace[OF_BACKTRACE_SIZE];

}

#ifdef OF_HAVE_PROPERTIES
@property (readonly) Class inClass;
#endif

/*!

Modified src/exceptions/OFException.m from [d08e1839ba] to [59da75fa7e].

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 * file.
 */

#include "config.h"

#include <stdlib.h>

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

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

#import "autorelease.h"





























@implementation OFException
+ (instancetype)exceptionWithClass: (Class)class
{
	return [[[self alloc] initWithClass: class] autorelease];
}

................................................................................
	}

	abort();
}

- initWithClass: (Class)class
{


	self = [super init];

	_inClass = class;
#if defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE)
	_backtraceSize = backtrace(_backtrace, 32);
#elif defined(HAVE_BUILTIN_RETURN_ADDRESS)
	/*
	 * We can't use a loop here, as __builtin_return_address() and
	 * __builtin_frame_address() only allow a constant as parameter.
	 */
# define GET_FRAME(i)							\
	if (__builtin_frame_address(i + 1) == NULL)			\
		goto backtrace_done;					\
	if ((_backtrace[i] = (__builtin_return_address(i))) == NULL)	\
		goto backtrace_done;
	GET_FRAME(0)
	GET_FRAME(1)
	GET_FRAME(2)
	GET_FRAME(3)
	GET_FRAME(4)
	GET_FRAME(5)
	GET_FRAME(6)
	GET_FRAME(7)
	GET_FRAME(8)
	GET_FRAME(9)
	GET_FRAME(10)
	GET_FRAME(11)
	GET_FRAME(12)
	GET_FRAME(13)
	GET_FRAME(14)
	GET_FRAME(15)
	GET_FRAME(16)
	GET_FRAME(17)
	GET_FRAME(18)
	GET_FRAME(19)
	GET_FRAME(20)
	GET_FRAME(21)
	GET_FRAME(22)
	GET_FRAME(23)
	GET_FRAME(24)
	GET_FRAME(25)
	GET_FRAME(26)
	GET_FRAME(27)
	GET_FRAME(28)
	GET_FRAME(29)
	GET_FRAME(30)
	GET_FRAME(31)
# undef GET_FRAME

backtrace_done:
#endif



	return self;
}

- (Class)inClass
{
	return _inClass;
................................................................................
	return [OFString stringWithFormat:
	    @"An exception of class %@ occurred in class %@!",
	    object_getClass(self), _inClass];
}

- (OFArray*)backtrace
{
#if defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE)
	OFMutableArray *backtrace = [OFMutableArray array];
	void *pool = objc_autoreleasePoolPush();
	char **symbols;



	if (_backtraceSize < 0)
		return nil;

	symbols = backtrace_symbols(_backtrace, _backtraceSize);
	@try {
		int i;

		for (i = 0; i < _backtraceSize; i++) {
			OFString *symbol = [OFString
			    stringWithCString: symbols[i]
				     encoding: OF_STRING_ENCODING_NATIVE];
			[backtrace addObject: symbol];
		}



	} @finally {
		free(symbols);




	}

	objc_autoreleasePoolPop(pool);

	[backtrace makeImmutable];

	return backtrace;
#elif defined(HAVE_BUILTIN_RETURN_ADDRESS)
	OFMutableArray *backtrace = [OFMutableArray array];
	void *pool = objc_autoreleasePoolPush();
	uint_fast8_t i;

	for (i = 0; i < 32 && _backtrace[i] != NULL; i++) {
		void *addr =
		    __builtin_extract_return_addr(_backtrace[i]);
# ifdef HAVE_DLFCN_H
		Dl_info info;

		if (dladdr(addr, &info)) {
			ptrdiff_t offset = (char*)addr - (char*)info.dli_saddr;

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

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

	objc_autoreleasePoolPop(pool);

	[backtrace makeImmutable];

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







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 * file.
 */

#include "config.h"

#include <stdlib.h>




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

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

#import "autorelease.h"

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*);
extern uintptr_t _Unwind_GetIP(struct _Unwind_Context*);

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

	if (bt->i < OF_BACKTRACE_SIZE) {
		bt->backtrace[bt->i++] = (void*)_Unwind_GetIP(ctx);
		return _URC_OK;
	}

	return _URC_END_OF_STACK;
}

@implementation OFException
+ (instancetype)exceptionWithClass: (Class)class
{
	return [[[self alloc] initWithClass: class] autorelease];
}

................................................................................
	}

	abort();
}

- initWithClass: (Class)class
{
	struct backtrace_ctx ctx;

	self = [super init];

	_inClass = class;














































	ctx.backtrace = _backtrace;

	ctx.i = 0;
	_Unwind_Backtrace(backtrace_callback, &ctx);

	return self;
}

- (Class)inClass
{
	return _inClass;
................................................................................
	return [OFString stringWithFormat:
	    @"An exception of class %@ occurred in class %@!",
	    object_getClass(self), _inClass];
}

- (OFArray*)backtrace
{

	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_DLFCN_H
		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;




}
































@end