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Allow the boxed exception object to rethrow itself, if it knows how. This means that a C++ function can throw a C++ object, we can box it in an ObjC object for passing through Objective-C stack frames, and then unbox it to catch it in C++ code.

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This commit is contained in:
theraven 2011-03-16 15:04:26 +00:00
parent a2db6f58be
commit 45c428f9a3
1 changed files with 21 additions and 4 deletions
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25
eh_personality.c
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@ -5,8 +5,8 @@
#include "dwarf_eh.h"
#include "objc/runtime.h"
#include "objc/hooks.h"
#include "class.h"
#define fprintf(...)
/**
@ -52,10 +52,26 @@ static void cleanup(_Unwind_Reason_Code reason, struct _Unwind_Exception *e)
unwindHeader)));
}
/**
*
* Throws an Objective-C exception. This function is, unfortunately, used for
* rethrowing caught exceptions too, even in @finally() blocks. Unfortunately,
* this means that we have some problems if the exception is boxed.
*/
void objc_exception_throw(id object)
{
SEL rethrow_sel = sel_registerName("rethrow");
if ((nil != object) &&
(class_respondsToSelector(object->isa, rethrow_sel)))
{
fprintf(stderr, "Rethrowing\n");
IMP rethrow = objc_msg_lookup(object, rethrow_sel);
rethrow(object, rethrow_sel);
// Should not be reached! If it is, then the rethrow method actually
// didn't, so we throw it normally.
}
fprintf(stderr, "Throwing %p\n", object);
struct objc_exception *ex = calloc(1, sizeof(struct objc_exception));
ex->unwindHeader.exception_class = objc_exception_class;
@ -89,7 +105,7 @@ Class get_type_table_entry(struct _Unwind_Context *context,
if (0 == class_name) { return Nil; }
fprintf(stderr, "Class name: %d\n", class_name);
fprintf(stderr, "Class name: %s\n", class_name);
if (__objc_id_typeinfo == class_name) { return (Class)1; }
@ -261,7 +277,7 @@ _Unwind_Reason_Code __gnu_objc_personality_v0(int version,
}
handler_type handler = check_action_record(context, foreignException,
&lsda, action.action_record, thrown_class, &selector);
fprintf(stderr, "handler! %d %d\n",handler, selector);
fprintf(stderr, "handler! %d %d\n", (int)handler, (int)selector);
// If this is not a cleanup, ignore it and keep unwinding.
//if (check_action_record(context, foreignException, &lsda,
//action.action_record, thrown_class, &selector) != handler_cleanup)
@ -287,6 +303,7 @@ _Unwind_Reason_Code __gnu_objc_personality_v0(int version,
SEL box_sel = sel_registerName("exceptionWithForeignException:");
IMP boxfunction = objc_msg_lookup((id)thrown_class, box_sel);
object = boxfunction((id)thrown_class, box_sel, exceptionObject);
fprintf(stderr, "Boxed as %p\n", object);
}
else
{