On Thu, Sep 20, 2012 at 11:46 AM, Dehao Chen <de...@google.com> wrote:
> Sure, I'll look into this problem today.
>
> Thanks,
> Dehao
>
> On Fri, Sep 21, 2012 at 2:25 AM, Ian Lance Taylor <i...@google.com> wrote:
>> Hi Dehao, I suspect that your recent patch changing block handling has
>> broken bootstrap with --enable-languages=go. I reduced the test case
>> to this C++ code:
>>
>> #include <string>
>>
>> std::string
>> f(bool is_string, bool is_constant)
>> {
>> if (is_string)
>> {
>> std::string left_string;
>> std::string right_string;
>> if (is_constant)
>> {
>> return left_string + right_string;
>> }
>> }
>>
>> return "";
>> }
>>
>> When I compile that with current mainline with -O -g I get a crash
>> (the backtrace is a local patch of mine):
>>
>> foo.cc: In function ‘std::string f(bool, bool)’:
>> foo.cc:17:1: internal compiler error: tree check: expected block, have
>> function_decl in change_scope, at final.c:1544
>> }
>> ^
>> 0xe388bd tree_check_failed(tree_node const*, char const*, int, char const*,
>> ...)
>> ../../trunk/gcc/tree.c:8892
>> 0x50c495 tree_check(tree_node*, char const*, int, char const*, tree_code)
>> ../../trunk/gcc/tree.h:3659
>> 0x9372a1 change_scope
>> ../../trunk/gcc/final.c:1544
>> 0x937646 reemit_insn_block_notes
>> ../../trunk/gcc/final.c:1613
>> 0x937822 final_start_function(rtx_def*, _IO_FILE*, int)
>> ../../trunk/gcc/final.c:1670
>> 0x93c6ad rest_of_handle_final
>> ../../trunk/gcc/final.c:4291
>> Please submit a full bug report,
>> with preprocessed source if appropriate.
>> Please include the complete backtrace with any bug report.
>> See <http://gcc.gnu.org/bugs.html> for instructions.
>>
>>
>> At first glance the bug is that the block obtained from insn_scope
>> (insn), called from reemit_insn_block_notes, has a block number of 0.
>> That leads to the crash in insn_scope.
>>
>> It's interesting that it only occurs with -g. I'm not sure what that means.
>>
>> Could you take a look at this and see if it is due to your patch?
>>
>> Thanks.
>>
>> Ian
It may also cause:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54645
--
H.J.
