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Re: Compiler crash with block numbers
On Thu, Sep 20, 2012 at 11:46 AM, Dehao Chen <email@example.com> wrote:
> Sure, I'll look into this problem today.
> On Fri, Sep 21, 2012 at 2:25 AM, Ian Lance Taylor <firstname.lastname@example.org> 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>
>> 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*, ...)
>> 0x50c495 tree_check(tree_node*, char const*, int, char const*, tree_code)
>> 0x9372a1 change_scope
>> 0x937646 reemit_insn_block_notes
>> 0x937822 final_start_function(rtx_def*, _IO_FILE*, int)
>> 0x93c6ad rest_of_handle_final
>> 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?
It may also cause: