https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87440
Bernd Edlinger <bernd.edlinger at hotmail dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bernd.edlinger at hotmail dot
de
--- Comment #5 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
This is only fixed for inlined subroutines with just one subrange,
but not for the case when a subroutine has multiple subranges,
as in this example:
https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gdb/testsuite/gdb.cp/step-and-next-inline.cc;h=ac92206fd7f9036b909968b46355bdb8c6861ec3;hb=HEAD
$ gcc -g -O2 step-and-next-inline.cc
here the first invocation of "tree_check" has multiple subranges,
and a redundant lexical block:
<2><865>: Abbrev Number: 41 (DW_TAG_inlined_subroutine)
<866> DW_AT_abstract_origin: <0x955>
<86a> DW_AT_entry_pc : 0x401165
<872> DW_AT_GNU_entry_view: 0
<873> DW_AT_ranges : 0x21
<877> DW_AT_call_file : 1
<878> DW_AT_call_line : 52
<879> DW_AT_call_column : 10
<87a> DW_AT_sibling : <0x8b9>
<3><87e>: Abbrev Number: 8 (DW_TAG_formal_parameter)
<87f> DW_AT_abstract_origin: <0x966>
<883> DW_AT_location : 0x37 (location list)
<887> DW_AT_GNU_locviews: 0x35
<3><88b>: Abbrev Number: 8 (DW_TAG_formal_parameter)
<88c> DW_AT_abstract_origin: <0x96e>
<890> DW_AT_location : 0x46 (location list)
<894> DW_AT_GNU_locviews: 0x44
<3><898>: Abbrev Number: 42 (DW_TAG_lexical_block)
<899> DW_AT_ranges : 0x21
while the other invocations look like:
<2><8b9>: Abbrev Number: 44 (DW_TAG_inlined_subroutine)
<8ba> DW_AT_abstract_origin: <0x955>
<8be> DW_AT_entry_pc : 0x401177
<8c6> DW_AT_GNU_entry_view: 0
<8c7> DW_AT_low_pc : 0x401177
<8cf> DW_AT_high_pc : 0xa
<8d7> DW_AT_call_file : 1
<8d8> DW_AT_call_line : 53
<8d9> DW_AT_call_column : 10
<8da> DW_AT_sibling : <0x906>
... and happen to be fixed by :
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ac02e5b75451cc3c6ae9028338183bcdcb056ea2
This is not a big issue, but the duplicated variables
show up only while stepping thru the first invocation:
$ gdb a.out
[...]
Breakpoint 1, main () at step-and-next-inline.cc:64
64 get_alias_set (&xx); /* Beginning of main */
(gdb) s
get_alias_set (t=t@entry=0x404020 <xx>) at step-and-next-inline.cc:51
51 if (t != NULL
(gdb) s
52 && TREE_TYPE (t).z != 1
(gdb) s
tree_check (t=0x404020 <xx>, i=0) at step-and-next-inline.cc:40
40 if (t->x != i)
(gdb) info locals
x = <optimized out>
x = <optimized out>
(gdb)
I have a patch...
