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Re: Errors when invoking refs_may_alias_p_1


On Fri, Aug 27, 2010 at 8:24 PM, Hongtao <yu171@purdue.edu> wrote:
> On 08/27/10 12:35, Richard Guenther wrote:
>> On Fri, Aug 27, 2010 at 5:27 PM, Hongtao <yu171@purdue.edu> wrote:
>>
>>> Hi all,
>>>
>>> I have instrumented a function call like foo(&a,&b) into the gimple SSA
>>> representation (gcc-4.5) and the consequent optimizations can not pass
>>> my instrumented code. The back traces are as followings. The error
>>> occurred when the pass dse tried to test if the call I inserted may use
>>> a memory reference. It is because the arguments &a is not a SSA_VAR or
>>> INDIRECT_REF, so the assert in function
>>>
>>> bool
>>> refs_may_alias_p_1 (ao_ref *ref1, ao_ref *ref2, bool tbaa_p)
>>>
>>> ?gcc_assert ((!ref1->ref
>>> ? ? ? ? ? || SSA_VAR_P (ref1->ref)
>>> ? ? ? ? ? || handled_component_p (ref1->ref)
>>> ? ? ? ? ? || INDIRECT_REF_P (ref1->ref)
>>> ? ? ? ? ? || TREE_CODE (ref1->ref) == TARGET_MEM_REF
>>> ? ? ? ? ? || TREE_CODE (ref1->ref) == CONST_DECL)
>>> ? ? ? ? ?&& (!ref2->ref
>>> ? ? ? ? ?|| SSA_VAR_P (ref2->ref)
>>> ? ? ? ? ?|| handled_component_p (ref2->ref)
>>> ? ? ? ? ?|| INDIRECT_REF_P (ref2->ref)
>>> ? ? ? ? ?|| TREE_CODE (ref2->ref) == TARGET_MEM_REF
>>> ? ? ? ? ?|| TREE_CODE (ref2->ref) == CONST_DECL));
>>> was violated.
>>>
>>> Does anyone know why the function arguments must be a SSA_VAR or
>>> INDIRECT_REF here? Have I missed to perform any actions to maintain the
>>> consistency of Gimple SSA?
>>>
>> Yes. ?is_gimple_val () will return false for your arguments as it seems that
>> the variables do not have function invariant addresses.
>>
>> Richard.
>>
>>
> Thanks. But how can I change my argument to gimple_vals, using it with
> an assignment to a temp before and replacing my argument with the temp?

Yes, that will work.

Richard.

> Hongtao
>>> #0 ?0x00007ffff6fc8ee0 in exit () from /lib/libc.so.6
>>> #1 ?0x00000000005ae4ce in diagnostic_action_after_output
>>> (context=0x1323880, diagnostic=0x7fffffffd870) at
>>> ../../src/gcc/diagnostic.c:198
>>> #2 ?0x00000000005aed54 in diagnostic_report_diagnostic
>>> (context=0x1323880, diagnostic=0x7fffffffd870) at
>>> ../../src/gcc/diagnostic.c:424
>>> #3 ?0x00000000005afdc3 in internal_error (gmsgid=0xddfb57 "in %s, at
>>> %s:%d") at ../../src/gcc/diagnostic.c:709
>>> #4 ?0x00000000005aff4f in fancy_abort (file=0xe42670
>>> "../../src/gcc/tree-ssa-alias.c", line=786, function=0xe427e0
>>> "refs_may_alias_p_1")
>>> ? ?at ../../src/gcc/diagnostic.c:763
>>> #5 ?0x00000000008a1adb in refs_may_alias_p_1 (ref1=0x7fffffffdab0,
>>> ref2=0x7fffffffdb50, tbaa_p=1 '\001')
>>> ? ?at ../../src/gcc/tree-ssa-alias.c:775
>>> #6 ?0x00000000008a2b12 in ref_maybe_used_by_call_p_1
>>> (call=0x7ffff6790630, ref=0x7fffffffdb50) at
>>> ../../src/gcc/tree-ssa-alias.c:1133
>>> #7 ?0x00000000008a2d2e in ref_maybe_used_by_call_p (call=0x7ffff6790630,
>>> ref=0x7ffff6848048) at ../../src/gcc/tree-ssa-alias.c:1147
>>> #8 ?0x00000000008a2dfa in ref_maybe_used_by_stmt_p (stmt=0x7ffff6790630,
>>> ref=0x7ffff6848048) at ../../src/gcc/tree-ssa-alias.c:1179
>>> #9 ?0x00000000008bf275 in dse_possible_dead_store_p
>>> (stmt=0x7ffff683e820, use_stmt=0x7fffffffdca8) at
>>> ../../src/gcc/tree-ssa-dse.c:212
>>> #10 0x00000000008bfeb9 in dse_optimize_stmt (dse_gd=0x7fffffffddd0,
>>> bd=0x156bd30, gsi=...) at ../../src/gcc/tree-ssa-dse.c:297
>>> #11 0x00000000008c029d in dse_enter_block (walk_data=0x7fffffffdde0,
>>> bb=0x7ffff6a75068) at ../../src/gcc/tree-ssa-dse.c:370
>>> #12 0x0000000000cc26a5 in walk_dominator_tree (walk_data=0x7fffffffdde0,
>>> bb=0x7ffff6a75068) at ../../src/gcc/domwalk.c:185
>>> #13 0x00000000008c0812 in tree_ssa_dse () at
>>> ../../src/gcc/tree-ssa-dse.c:430
>>> #14 0x000000000073af0a in execute_one_pass (pass=0x13cced0) at
>>> ../../src/gcc/passes.c:1572
>>> #15 0x000000000073b21a in execute_pass_list (pass=0x13cced0) at
>>> ../../src/gcc/passes.c:1627
>>> #16 0x000000000073b238 in execute_pass_list (pass=0x1312720) at
>>> ../../src/gcc/passes.c:1628
>>> #17 0x000000000086e372 in tree_rest_of_compilation
>>> (fndecl=0x7ffff6b93500) at ../../src/gcc/tree-optimize.c:413
>>> #18 0x00000000009fa7c5 in cgraph_expand_function (node=0x7ffff6be7000)
>>> at ../../src/gcc/cgraphunit.c:1548
>>> #19 0x00000000009faa49 in cgraph_expand_all_functions () at
>>> ../../src/gcc/cgraphunit.c:1627
>>> #20 0x00000000009fb07e in cgraph_optimize () at
>>> ../../src/gcc/cgraphunit.c:1875
>>> #21 0x00000000009f9461 in cgraph_finalize_compilation_unit () at
>>> ../../src/gcc/cgraphunit.c:1096
>>> #22 0x00000000004a9e93 in c_write_global_declarations () at
>>> ../../src/gcc/c-decl.c:9519
>>> #23 0x00000000008180d4 in compile_file () at ../../src/gcc/toplev.c:1065
>>> #24 0x000000000081a1c5 in do_compile () at ../../src/gcc/toplev.c:2417
>>> #25 0x000000000081a286 in toplev_main (argc=21, argv=0x7fffffffe0f8) at
>>> ../../src/gcc/toplev.c:2459
>>> #26 0x0000000000519c6b in main (argc=21, argv=0x7fffffffe0f8) at
>>> ../../src/gcc/main.c:35
>>>
>>> Thanks,
>>>
>>> Hongtao
>>> Purdue University
>>>
>>>
>>>
>>>
>>
>
>


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