ObjFW  Check-in [13c2017326]

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Comment:runtime: Add support for emergency exceptions
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SHA3-256: 13c2017326f6ad0dd91cbad8b123feaef6b5a1c6dbded98c99cb2a91eab36da9
User & Date: js on 2017-04-14 02:16:35
Other Links: manifest | tags
Context
2017-04-14
02:28
OFSandbox: Revert using a bitfield check-in: 02ccf37477 user: js tags: trunk
02:16
runtime: Add support for emergency exceptions check-in: 13c2017326 user: js tags: trunk
2017-04-13
13:30
-[OFObject release]: Add memory barriers check-in: 05e2b4b851 user: js tags: trunk
Changes
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Modified src/runtime/exception.m from [ae672d1e54] to [80255e6a7d].

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 * 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 <stdlib.h>
#include <string.h>

#ifdef HAVE_SEH_EXCEPTIONS
# include <windows.h>
#endif

#import "runtime.h"
#import "runtime-private.h"

#import "macros.h"




#if defined(HAVE_DWARF_EXCEPTIONS)
# define PERSONALITY __gnu_objc_personality_v0
# define CXX_PERSONALITY_STR "__gxx_personality_v0"
#elif defined(HAVE_SJLJ_EXCEPTIONS)
# define PERSONALITY __gnu_objc_personality_sj0
# define CXX_PERSONALITY_STR "__gxx_personality_sj0"








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 * 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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef HAVE_SEH_EXCEPTIONS
# include <windows.h>
#endif

#import "runtime.h"
#import "runtime-private.h"

#import "macros.h"
#ifdef OF_HAVE_THREADS
# include "threading.h"
#endif

#if defined(HAVE_DWARF_EXCEPTIONS)
# define PERSONALITY __gnu_objc_personality_v0
# define CXX_PERSONALITY_STR "__gxx_personality_v0"
#elif defined(HAVE_SJLJ_EXCEPTIONS)
# define PERSONALITY __gnu_objc_personality_sj0
# define CXX_PERSONALITY_STR "__gxx_personality_sj0"
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	    struct _Unwind_Context *ctx)
# define CALL_PERSONALITY(func) func(state, ex, ctx)
#endif

#define GNUCOBJC_EXCEPTION_CLASS UINT64_C(0x474E55434F424A43) /* GNUCOBJC */
#define GNUCCXX0_EXCEPTION_CLASS UINT64_C(0x474E5543432B2B00) /* GNUCC++\0 */
#define CLNGCXX0_EXCEPTION_CLASS UINT64_C(0x434C4E47432B2B00) /* CLNGC++\0 */



#define _UA_SEARCH_PHASE  0x01
#define _UA_CLEANUP_PHASE 0x02
#define _UA_HANDLER_FRAME 0x04
#define _UA_FORCE_UNWIND  0x08

#define DW_EH_PE_absptr	  0x00








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	    struct _Unwind_Context *ctx)
# define CALL_PERSONALITY(func) func(state, ex, ctx)
#endif

#define GNUCOBJC_EXCEPTION_CLASS UINT64_C(0x474E55434F424A43) /* GNUCOBJC */
#define GNUCCXX0_EXCEPTION_CLASS UINT64_C(0x474E5543432B2B00) /* GNUCC++\0 */
#define CLNGCXX0_EXCEPTION_CLASS UINT64_C(0x434C4E47432B2B00) /* CLNGC++\0 */

#define NUM_EMERGENCY_EXCEPTIONS 4

#define _UA_SEARCH_PHASE  0x01
#define _UA_CLEANUP_PHASE 0x02
#define _UA_HANDLER_FRAME 0x04
#define _UA_FORCE_UNWIND  0x08

#define DW_EH_PE_absptr	  0x00
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#ifdef HAVE_SEH_EXCEPTIONS
extern EXCEPTION_DISPOSITION _GCC_specific_handler(PEXCEPTION_RECORD, void*,
    PCONTEXT, PDISPATCHER_CONTEXT, _Unwind_Reason_Code(*)(int, int, uint64_t,
    struct _Unwind_Exception*, struct _Unwind_Context*));
#endif

static objc_uncaught_exception_handler uncaught_exception_handler;











static uint64_t
read_uleb128(const uint8_t **ptr)
{
	uint64_t value = 0;
	uint8_t shift = 0;









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#ifdef HAVE_SEH_EXCEPTIONS
extern EXCEPTION_DISPOSITION _GCC_specific_handler(PEXCEPTION_RECORD, void*,
    PCONTEXT, PDISPATCHER_CONTEXT, _Unwind_Reason_Code(*)(int, int, uint64_t,
    struct _Unwind_Exception*, struct _Unwind_Context*));
#endif

static objc_uncaught_exception_handler uncaught_exception_handler;
static struct objc_exception emergency_exceptions[NUM_EMERGENCY_EXCEPTIONS];
#ifdef OF_HAVE_THREADS
static of_spinlock_t emergency_exceptions_spinlock;

OF_CONSTRUCTOR()
{
	if (!of_spinlock_new(&emergency_exceptions_spinlock))
		OBJC_ERROR("Cannot create spinlock!")
}
#endif

static uint64_t
read_uleb128(const uint8_t **ptr)
{
	uint64_t value = 0;
	uint8_t shift = 0;
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}

static void
cleanup(_Unwind_Reason_Code reason, struct _Unwind_Exception *ex)
{
	free(ex);
}

















void
objc_exception_throw(id object)
{
	struct objc_exception *e;







	if ((e = malloc(sizeof(*e))) == NULL)

















		OBJC_ERROR("Not enough memory to allocate exception!")

	memset(e, 0, sizeof(*e));
	e->exception.class = GNUCOBJC_EXCEPTION_CLASS;
	e->exception.cleanup = cleanup;
	e->object = object;

	if (_Unwind_RaiseException(&e->exception) == _URC_END_OF_STACK &&
	    uncaught_exception_handler != NULL)
		uncaught_exception_handler(object);

	OBJC_ERROR("_Unwind_RaiseException() returned!")









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}

static void
cleanup(_Unwind_Reason_Code reason, struct _Unwind_Exception *ex)
{
	free(ex);
}

static void
cleanup_emergency(_Unwind_Reason_Code reason, struct _Unwind_Exception *ex)
{
#ifdef OF_HAVE_THREADS
	if (!of_spinlock_lock(&emergency_exceptions_spinlock))
		OBJC_ERROR("Cannot lock spinlock!");
#endif

	ex->class = 0;

#ifdef OF_HAVE_THREADS
	if (!of_spinlock_unlock(&emergency_exceptions_spinlock))
		OBJC_ERROR("Cannot unlock spinlock!");
#endif
}

void
objc_exception_throw(id object)
{
	struct objc_exception *e = malloc(sizeof(*e));
	bool emergency = false;

	if (e == NULL) {
#ifdef OF_HAVE_THREADS
		if (!of_spinlock_lock(&emergency_exceptions_spinlock))
			OBJC_ERROR("Cannot lock spinlock!");
#endif

		for (uint_fast8_t i = 0; i < NUM_EMERGENCY_EXCEPTIONS; i++) {
			if (emergency_exceptions[i].exception.class == 0) {
				e = &emergency_exceptions[i];
				e->exception.class = GNUCOBJC_EXCEPTION_CLASS;
				emergency = true;

				break;
			}
		}

#ifdef OF_HAVE_THREADS
		if (!of_spinlock_unlock(&emergency_exceptions_spinlock))
			OBJC_ERROR("Cannot lock spinlock!");
#endif
	}

	if (e == NULL)
		OBJC_ERROR("Not enough memory to allocate exception!")

	memset(e, 0, sizeof(*e));
	e->exception.class = GNUCOBJC_EXCEPTION_CLASS;
	e->exception.cleanup = (emergency ? cleanup_emergency : cleanup);
	e->object = object;

	if (_Unwind_RaiseException(&e->exception) == _URC_END_OF_STACK &&
	    uncaught_exception_handler != NULL)
		uncaught_exception_handler(object);

	OBJC_ERROR("_Unwind_RaiseException() returned!")
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Fossil 2.23 [47362306a7] 2023-11-01 18:56:47
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