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Re: Edges, predictions, and GC crashes ...

From: Daniel Berlin <dberlin at dberlin dot org>
To: Ulrich Weigand <uweigand at de dot ibm dot com>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 2 Jun 2005 13:07:28 -0400 (EDT)
Subject: Re: Edges, predictions, and GC crashes ...
References: <200506021659.j52Gxb68009561@53v30g16.boeblingen.de.ibm.com>

On Thu, 2 Jun 2005, Ulrich Weigand wrote:

Hello,

I'm seeing compiler crashes during garbage collection when using mudflap.

The problem appears to be that some basic_block_def structures point to
edge_prediction structures which point to edge_def structures that have
already been ggc_free()'d.

I keep hitting this problem on my darwin machine with my "rename exit and entry blocks to block 0 and 1" patch. At first i thought it was something in the patch, but it's not. It's the exact problem you describe.


Now, looking at remove_edge (cfg.c) is does indeed appear that it is
possible for edges to get deleted without the corresponding prediction
structure being removed as well ...

References:
- Edges, predictions, and GC crashes ...
  - From: Ulrich Weigand

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