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Fix memory corruption probelem in reload. 

* reload.c (find_reloads_address_part): If have a CONST_INT, create
	a new one before passing it to force_const_mem.

From-SVN: r23698
This commit is contained in:
Jim Wilson 1998-11-18 17:52:45 +00:00 committed by Jim Wilson
parent 10352226d4
commit ef18065c0a
2 changed files with 24 additions and 2 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
Wed Nov 18 16:31:28 1998 Jim Wilson <wilson@cygnus.com>
* reload.c (find_reloads_address_part): If have a CONST_INT, create
a new one before passing it to force_const_mem.
* reload.c (find_reloads_toplev): Pass &x instead of NULL_PTR in
find_reloads_address call.

23
gcc/reload.c
View File

@ -5517,7 +5517,20 @@ find_reloads_address_part (x, loc, class, mode, opnum, type, ind_levels)
&& (! LEGITIMATE_CONSTANT_P (x)
|| PREFERRED_RELOAD_CLASS (x, class) == NO_REGS))
{
rtx tem = x = force_const_mem (mode, x);
rtx tem;
/* If this is a CONST_INT, it could have been created by a
plus_constant call in eliminate_regs, which means it may be
on the reload_obstack. reload_obstack will be freed later, so
we can't allow such RTL to be put in the constant pool. There
is code in force_const_mem to check for this case, but it doesn't
work because we have already popped off the reload_obstack, so
rtl_obstack == saveable_obstack is true at this point. */
if (GET_CODE (x) == CONST_INT)
tem = x = force_const_mem (mode, GEN_INT (INTVAL (x)));
else
tem = x = force_const_mem (mode, x);
find_reloads_address (mode, &tem, XEXP (tem, 0), &XEXP (tem, 0),
opnum, type, ind_levels, 0);
}
@ -5527,7 +5540,13 @@ find_reloads_address_part (x, loc, class, mode, opnum, type, ind_levels)
&& (! LEGITIMATE_CONSTANT_P (XEXP (x, 1))
|| PREFERRED_RELOAD_CLASS (XEXP (x, 1), class) == NO_REGS))
{
rtx tem = force_const_mem (GET_MODE (x), XEXP (x, 1));
rtx tem;
/* See comment above. */
if (GET_CODE (XEXP (x, 1)) == CONST_INT)
tem = force_const_mem (GET_MODE (x), GEN_INT (INTVAL (XEXP (x, 1))));
else
tem = force_const_mem (GET_MODE (x), XEXP (x, 1));
x = gen_rtx_PLUS (GET_MODE (x), XEXP (x, 0), tem);
find_reloads_address (mode, &tem, XEXP (tem, 0), &XEXP (tem, 0),