On 03/09/2017 08:28 PM, David Malcolm wrote:
The root cause is an out-of-bounds memory write in the RTL dump
reader when handling SYMBOL_REFs with SYMBOL_FLAG_HAS_BLOCK_INFO set.
Such SYMBOL_REFs are normally created by varasm.c:create_block_symbol,
which has:
Hmm, I don't actually recall seeing this stuff. It's for section anchors
apparently.
OK for trunk in stage 4?
gcc/ChangeLog:
PR bootstrap/79952
* read-rtl-function.c (function_reader::read_rtx_operand): Update
x with result of extra_parsing_for_operand_code_0.
(function_reader::extra_parsing_for_operand_code_0): Convert
return type from void to rtx, returning x. When reading
SYMBOL_REF with SYMBOL_FLAG_HAS_BLOCK_INFO, reallocate x to the
larger size containing struct block_symbol.
Looks OK for now, but longer term I think we should make it possible to
reconstruct this data.
Bernd
