https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84456
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-03-08
CC| |jakub at gcc dot gnu.org
Component|testsuite |debug
Ever confirmed|0 |1
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
In gcc 7 as well as with -gvariable-location-views in trunk, the 6 problematic
tests are UNSUPPORTED, due to:
Breakpoint 1, f (p=p@entry=0x7fffffffd844) at
/usr/src/gcc-7/gcc/testsuite/gcc.dg/guality/pr49888.c:18
18 v = 0; /* { dg-final { gdb-test 18 "!c" "1" } } */
pr49888.gdb:3: Error in sourced command file:
value has been optimized out
UNSUPPORTED: gcc.dg/guality/pr49888.c -O1 line 18 !c == 1
etc.
On the trunk without location views, it is a FAIL instead:
Breakpoint 1, f (p=p@entry=0x7fffffffd7d4) at
/usr/src/gcc/gcc/testsuite/gcc.dg/guality/pr49888.c:18
18 v = 0; /* { dg-final { gdb-test 18 "!c" "1" } } */
$1 = 0
$2 = 1
A debugging session is active.
Inferior 1 [process 11689] will be killed.
0 != 1
FAIL: gcc.dg/guality/pr49888.c -O1 line 18 !c == 1
The *.final dump is still correct, on the trunk:
1: NOTE_INSN_DELETED
25: NOTE_INSN_VAR_LOCATION{loc di:DI} ! p var
4: NOTE_INSN_BASIC_BLOCK 2
17: NOTE_INSN_PROLOGUE_END
3: NOTE_INSN_FUNCTION_BEG
21: NOTE_INSN_BEGIN_STMT
26: NOTE_INSN_VAR_LOCATION{loc [di:DI]} ! c var
22: NOTE_INSN_BEGIN_STMT
23: NOTE_INSN_BEGIN_STMT
11: [di:DI]=0x1
REG_DEAD di:DI
27: NOTE_INSN_VAR_LOCATION{loc (nil)} ! c var
24: NOTE_INSN_BEGIN_STMT
13: [`v']=0
18: NOTE_INSN_EPILOGUE_BEG
19: simple_return
20: barrier
16: NOTE_INSN_DELETED
and in 7.3 similarly with the NOTE_INSN_BEGIN_STMT deleted.
1: NOTE_INSN_DELETED
17: NOTE_INSN_VAR_LOCATION{loc di:DI} ! p var
4: NOTE_INSN_BASIC_BLOCK 2
13: NOTE_INSN_PROLOGUE_END
3: NOTE_INSN_FUNCTION_BEG
18: NOTE_INSN_VAR_LOCATION{loc [di:DI]} ! c var
8: [di:DI]=0x1
REG_DEAD di:DI
19: NOTE_INSN_VAR_LOCATION{loc (nil)}
9: [`v']=0
14: NOTE_INSN_EPILOGUE_BEG
15: simple_return
16: barrier
12: NOTE_INSN_DELETED
The bug is that the trunk without -gvariable-location-views makes:
.uleb128 0x2 # (DIE (0xb4) DW_TAG_variable)
.ascii "c\0" # DW_AT_name
.byte 0x1 # DW_AT_decl_file (pr49888.c)
.byte 0xa # DW_AT_decl_line
.byte 0x7 # DW_AT_decl_column
.long 0x41 # DW_AT_type
.uleb128 0x2 # DW_AT_location
.byte 0x75 # DW_OP_breg5
.sleb128 0
out of it rather than the expected:
.uleb128 0x9 # (DIE (0xaf) DW_TAG_variable)
.ascii "c\0" # DW_AT_name
.byte 0x1 # DW_AT_decl_file (pr49888.c)
.byte 0xa # DW_AT_decl_line
.long 0x40 # DW_AT_type
.long .LLST0 # DW_AT_location
that e.g. GCC 7 emits.
