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libgcc2.c (throw_helper): Just return the SP offset, rather than a whole udata.

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* libgcc2.c (throw_helper): Just return the SP offset, rather than
	a whole udata.  Include args_size in the offset.
	(__throw, __rethrow): Adjust.

From-SVN: r26066
This commit is contained in:
Jason Merrill 1999-03-30 14:12:49 +00:00 committed by Jason Merrill
parent 1504b2b439
commit 51980de69e
2 changed files with 49 additions and 35 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Tue Mar 30 13:19:36 1999 Jason Merrill <jason@yorick.cygnus.com>
* libgcc2.c (throw_helper): Just return the SP offset, rather than
a whole udata. Include args_size in the offset.
(__throw, __rethrow): Adjust.
Tue Mar 30 11:39:27 1999 Craig Burley <craig@jcb-sc.com>
* extend.texi (Extended Asm): Delete spurious `b' before

78
gcc/libgcc2.c
View File

@ -3692,16 +3692,21 @@ __unwinding_cleanup ()
for a dummy call to a routine __unwinding_cleanup() when there are nothing
but cleanups remaining. This allows a debugger to examine the state
at which the throw was executed, before any cleanups, rather than
at the terminate point after the stack has been unwound. */
at the terminate point after the stack has been unwound.
EH is the current eh_context structure.
PC is the address of the call to __throw.
MY_UDATA is the unwind information for __throw.
OFFSET_P is where we return the SP adjustment offset. */
static void *
throw_helper (eh, pc, my_udata, udata_p)
throw_helper (eh, pc, my_udata, offset_p)
struct eh_context *eh;
void *pc;
frame_state *my_udata;
frame_state **udata_p;
long *offset_p;
{
frame_state *udata = *udata_p;
frame_state ustruct2, *udata = &ustruct2;
frame_state ustruct;
frame_state *sub_udata = &ustruct;
void *saved_pc = pc;
@ -3714,12 +3719,15 @@ throw_helper (eh, pc, my_udata, udata_p)
int only_cleanup = 0;
int rethrow = 0;
int saved_state = 0;
long args_size;
__eh_info *eh_info = (__eh_info *)eh->info;
/* Do we find a handler based on a re-throw PC? */
if (eh->table_index != (void *) 0)
rethrow = 1;
memcpy (udata, my_udata, sizeof (*udata));
handler = (void *) 0;
for (;;)
{
@ -3795,6 +3803,8 @@ throw_helper (eh, pc, my_udata, udata_p)
eh->handler_label = handler;
args_size = udata->args_size;
if (pc == saved_pc)
/* We found a handler in the throw context, no need to unwind. */
udata = my_udata;
@ -3847,7 +3857,17 @@ throw_helper (eh, pc, my_udata, udata_p)
}
/* udata now refers to the frame called by the handler frame. */
*udata_p = udata;
/* We adjust SP by the difference between __throw's CFA and the CFA for
the frame called by the handler frame, because those CFAs correspond
to the SP values at the two call sites. We need to further adjust by
the args_size of the handler frame itself to get the handler frame's
SP from before the args were pushed for that call. */
#ifdef STACK_GROWS_DOWNWARD
*offset_p = udata->cfa - my_udata->cfa + args_size;
#else
*offset_p = my_udata->cfa - udata->cfa - args_size;
#endif
return handler;
}
@ -3867,8 +3887,10 @@ __throw ()
{
struct eh_context *eh = (*get_eh_context) ();
void *pc, *handler;
frame_state ustruct;
frame_state *udata = &ustruct;
long offset;
/* XXX maybe make my_ustruct static so we don't have to look it up for
each throw. */
frame_state my_ustruct, *my_udata = &my_ustruct;
/* This is required for C++ semantics. We must call terminate if we
@ -3879,14 +3901,12 @@ __throw ()
/* Start at our stack frame. */
label:
udata = __frame_state_for (&&label, udata);
if (! udata)
my_udata = __frame_state_for (&&label, my_udata);
if (! my_udata)
__terminate ();
/* We need to get the value from the CFA register. */
udata->cfa = __builtin_dwarf_cfa ();
memcpy (my_udata, udata, sizeof (*udata));
my_udata->cfa = __builtin_dwarf_cfa ();
/* Do any necessary initialization to access arbitrary stack frames.
On the SPARC, this means flushing the register windows. */
@ -3895,17 +3915,11 @@ label:
/* Now reset pc to the right throw point. */
pc = __builtin_extract_return_addr (__builtin_return_address (0)) - 1;
handler = throw_helper (eh, pc, my_udata, &udata);
handler = throw_helper (eh, pc, my_udata, &offset);
/* Now go! */
__builtin_eh_return ((void *)eh,
#ifdef STACK_GROWS_DOWNWARD
udata->cfa - my_udata->cfa,
#else
my_udata->cfa - udata->cfa,
#endif
handler);
__builtin_eh_return ((void *)eh, offset, handler);
/* Epilogue: restore the handler frame's register values and return
to the stub. */
@ -3919,8 +3933,10 @@ __rethrow (index)
{
struct eh_context *eh = (*get_eh_context) ();
void *pc, *handler;
frame_state ustruct;
frame_state *udata = &ustruct;
long offset;
/* XXX maybe make my_ustruct static so we don't have to look it up for
each throw. */
frame_state my_ustruct, *my_udata = &my_ustruct;
/* This is required for C++ semantics. We must call terminate if we
@ -3936,14 +3952,12 @@ __rethrow (index)
/* Start at our stack frame. */
label:
udata = __frame_state_for (&&label, udata);
if (! udata)
my_udata = __frame_state_for (&&label, my_udata);
if (! my_udata)
__terminate ();
/* We need to get the value from the CFA register. */
udata->cfa = __builtin_dwarf_cfa ();
memcpy (my_udata, udata, sizeof (*udata));
my_udata->cfa = __builtin_dwarf_cfa ();
/* Do any necessary initialization to access arbitrary stack frames.
On the SPARC, this means flushing the register windows. */
@ -3952,17 +3966,11 @@ label:
/* Now reset pc to the right throw point. */
pc = __builtin_extract_return_addr (__builtin_return_address (0)) - 1;
handler = throw_helper (eh, pc, my_udata, &udata);
handler = throw_helper (eh, pc, my_udata, &offset);
/* Now go! */
__builtin_eh_return ((void *)eh,
#ifdef STACK_GROWS_DOWNWARD
udata->cfa - my_udata->cfa,
#else
my_udata->cfa - udata->cfa,
#endif
handler);
__builtin_eh_return ((void *)eh, offset, handler);
/* Epilogue: restore the handler frame's register values and return
to the stub. */