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Re: Mainline bootstrap failure (revision 110017)
- From: Daniel Berlin <dberlin at dberlin dot org>
- To: Ranjit Mathew <rmathew at gmail dot com>, Kenneth Zadeck <zadeck at naturalbridge dot com>, Andrew Pinski <pinskia at physics dot uc dot edu>
- Cc: gcc at gcc dot gnu dot org
- Date: Fri, 20 Jan 2006 00:42:24 -0500
- Subject: Re: Mainline bootstrap failure (revision 110017)
- References: <dqps5o$737$1@sea.gmane.org>
On Fri, 2006-01-20 at 10:53 +0530, Ranjit Mathew wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi,
>
> Mainline fails to bootstrap for me (revision 110017)
> on i686-pc-linux-gnu.
>
> Configured as:
>
> $GCC_SRC_DIR/configure --prefix=$HOME/gcc --enable-languages=c,c++,java \
> - --with-as=/home/ranmath/gnu/bin/as --with-gnu-as \
> - --with-ld=/home/ranmath/gnu/bin/ld --with-gnu-ld \
> - --with-arch=pentium4 --with-tune=pentium4 \
> - --disable-nls --disable-checking --disable-libmudflap \
> - --disable-debug --enable-threads=posix --enable-__cxa_atexit \
> - --disable-static
>
Kenny thought it would be nice, rather than pass the actual bb info to free to the freeing function, to instead pass some random bitmap.
The attached fixes *that*, but this just causes a crash deeper in trying to free some chains.
However, it looks like that is either caused by a double free, or because
we never null out pointers to things after we free the memory for what they are pointing to.
Index: df-core.c
===================================================================
--- df-core.c (revision 110017)
+++ df-core.c (working copy)
@@ -292,6 +292,7 @@ are write-only operations.
static struct df *ddf = NULL;
struct df *shared_df = NULL;
+static void * df_get_bb_info (struct dataflow *, unsigned int);
/*----------------------------------------------------------------------------
Functions to create, destroy and manipulate an instance of df.
----------------------------------------------------------------------------*/
@@ -370,7 +371,7 @@ df_set_blocks (struct df *df, bitmap blo
EXECUTE_IF_SET_IN_BITMAP (diff, 0, bb_index, bi)
{
basic_block bb = BASIC_BLOCK (bb_index);
- (*dflow->problem->free_bb_fun) (dflow, bb, diff);
+ (*dflow->problem->free_bb_fun) (dflow, bb, df_get_bb_info (dflow, bb_index));
}
}
}