r218129 - Omit DW_TAG_subprograms for subprograms without inlined subroutines when producing -gmlt data
Kuba Brecka
kuba.brecka at gmail.com
Thu Sep 25 13:03:19 PDT 2014
Clang r218129:
$ ./bin/clang -gline-tables-only a.c -o a.out -###
clang version 3.6.0 (218129)
Target: x86_64-apple-darwin14.0.0
Thread model: posix
"/Users/kuba/llvm-tot-cmake-release/bin/clang-3.6" "-cc1" "-triple"
"x86_64-apple-macosx10.10.0" "-emit-obj" "-mrelax-all" "-disable-free"
"-main-file-name" "a.c" "-mrelocation-model" "pic" "-pic-level" "2"
"-mdisable-fp-elim" "-masm-verbose" "-munwind-tables" "-target-cpu" "core2"
"-gline-tables-only" "-gdwarf-2" "-dwarf-column-info" "-resource-dir"
"/Users/kuba/llvm-tot-cmake-release/bin/../lib/clang/3.6.0"
"-fdebug-compilation-dir" "/Users/kuba/llvm-tot-cmake-release"
"-ferror-limit" "19" "-fmessage-length" "364" "-stack-protector" "1"
"-mstackrealign" "-fblocks" "-fobjc-runtime=macosx-10.10.0"
"-fencode-extended-block-signature" "-fmax-type-align=16"
"-fdiagnostics-show-option" "-fcolor-diagnostics" "-o"
"/var/folders/k0/qjt5nwj91314gwrg0j9ltrrw0000gn/T/a-87344c.o" "-x" "c" "a.c"
"/usr/bin/ld" "-dynamic" "-arch" "x86_64" "-macosx_version_min" "10.10.0"
"-o" "a.out" "/var/folders/k0/qjt5nwj91314gwrg0j9ltrrw0000gn/T/a-87344c.o"
"-lSystem"
"/usr/bin/dsymutil" "-o" "a.out.dSYM" "a.out"
$ ./bin/clang -cc1 -triple x86_64-apple-macosx10.10.0 -emit-obj
-gline-tables-only -gdwarf-2 -dwarf-column-info a.c -o a.o
$ ld -dynamic -arch x86_64 -o a.out a.o -lSystem -macosx_version_min 10.10.0
$ dsymutil a.out -o a.out.dSYM
warning: no debug symbols in executable (-arch x86_64)
$ ./bin/llvm-dwarfdump -debug-dump=all
a.out.dSYM/Contents/Resources/DWARF/a.out
a.out.dSYM/Contents/Resources/DWARF/a.out: file format Mach-O 64-bit x86-64
.debug_abbrev contents:
Abbrev table for offset: 0x00000000
.debug_abbrev.dwo contents:
< EMPTY >
.debug_info contents:
.debug_loc contents:
.debug_loc.dwo contents:
.debug_frame contents:
.debug_aranges contents:
.debug_line contents:
.debug_line.dwo contents:
.debug_str contents:
0x00000000: ""
.debug_ranges contents:
.debug_pubnames contents:
.debug_pubtypes contents:
.debug_gnu_pubnames contents:
.debug_gnu_pubtypes contents:
$
Clang r218128:
$ ./bin/clang -gline-tables-only a.c -o a.out -###
clang version 3.6.0 (218128)
Target: x86_64-apple-darwin14.0.0
Thread model: posix
"/Users/kuba/llvm-tot-cmake-release/bin/clang-3.6" "-cc1" "-triple"
"x86_64-apple-macosx10.10.0" "-emit-obj" "-mrelax-all" "-disable-free"
"-main-file-name" "a.c" "-mrelocation-model" "pic" "-pic-level" "2"
"-mdisable-fp-elim" "-masm-verbose" "-munwind-tables" "-target-cpu" "core2"
"-gline-tables-only" "-gdwarf-2" "-dwarf-column-info" "-resource-dir"
"/Users/kuba/llvm-tot-cmake-release/bin/../lib/clang/3.6.0"
"-fdebug-compilation-dir" "/Users/kuba/llvm-tot-cmake-release"
"-ferror-limit" "19" "-fmessage-length" "364" "-stack-protector" "1"
"-mstackrealign" "-fblocks" "-fobjc-runtime=macosx-10.10.0"
"-fencode-extended-block-signature" "-fmax-type-align=16"
"-fdiagnostics-show-option" "-fcolor-diagnostics" "-o"
"/var/folders/k0/qjt5nwj91314gwrg0j9ltrrw0000gn/T/a-d4d93b.o" "-x" "c" "a.c"
"/usr/bin/ld" "-dynamic" "-arch" "x86_64" "-macosx_version_min" "10.10.0"
"-o" "a.out" "/var/folders/k0/qjt5nwj91314gwrg0j9ltrrw0000gn/T/a-d4d93b.o"
"-lSystem"
"/usr/bin/dsymutil" "-o" "a.out.dSYM" "a.out"
$ ./bin/clang -cc1 -triple x86_64-apple-macosx10.10.0 -emit-obj
-gline-tables-only -gdwarf-2 -dwarf-column-info a.c -o a.o
$ ld -dynamic -arch x86_64 -o a.out a.o -lSystem -macosx_version_min 10.10.0
$ dsymutil a.out -o a.out.dSYM
$ ./bin/llvm-dwarfdump -debug-dump=all
a.out.dSYM/Contents/Resources/DWARF/a.out
a.out.dSYM/Contents/Resources/DWARF/a.out: file format Mach-O 64-bit x86-64
.debug_abbrev contents:
Abbrev table for offset: 0x00000000
[1] DW_TAG_compile_unit DW_CHILDREN_yes
DW_AT_producer DW_FORM_strp
DW_AT_language DW_FORM_data2
DW_AT_name DW_FORM_strp
DW_AT_stmt_list DW_FORM_data4
DW_AT_comp_dir DW_FORM_strp
[2] DW_TAG_subprogram DW_CHILDREN_no
DW_AT_low_pc DW_FORM_addr
DW_AT_high_pc DW_FORM_addr
DW_AT_APPLE_omit_frame_ptr DW_FORM_flag
DW_AT_name DW_FORM_strp
.debug_abbrev.dwo contents:
< EMPTY >
.debug_info contents:
0x00000000: Compile Unit: length = 0x00000047 version = 0x0002 abbr_offset
= 0x0000 addr_size = 0x08 (next unit at 0x0000004b)
0x0000000b: DW_TAG_compile_unit [1] *
DW_AT_producer [DW_FORM_strp] ( .debug_str[0x00000001] =
"clang version 3.6.0 (218128)")
DW_AT_language [DW_FORM_data2] (DW_LANG_C99)
DW_AT_name [DW_FORM_strp] ( .debug_str[0x0000001e] =
"<stdin>")
DW_AT_stmt_list [DW_FORM_data4] (0x00000000)
DW_AT_comp_dir [DW_FORM_strp] ( .debug_str[0x00000026] =
"/Users/kuba/llvm-tot-cmake-release")
0x0000001e: DW_TAG_subprogram [2]
DW_AT_low_pc [DW_FORM_addr] (0x0000000100000f20)
DW_AT_high_pc [DW_FORM_addr] (0x0000000100000f39)
DW_AT_APPLE_omit_frame_ptr [DW_FORM_flag] (0x01)
DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000049] = "f")
0x00000034: DW_TAG_subprogram [2]
DW_AT_low_pc [DW_FORM_addr] (0x0000000100000f40)
DW_AT_high_pc [DW_FORM_addr] (0x0000000100000f83)
DW_AT_APPLE_omit_frame_ptr [DW_FORM_flag] (0x01)
DW_AT_name [DW_FORM_strp] ( .debug_str[0x0000004b] = "main")
0x0000004a: NULL
.debug_loc contents:
.debug_loc.dwo contents:
.debug_frame contents:
00000000 00000014 ffffffff CIE
Version: 1
Augmentation: ""
Code alignment factor: 1
Data alignment factor: -8
Return address column: 16
DW_CFA_def_cfa:
DW_CFA_offset:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
00000018 0000001c 00000000 FDE cie=00000000 pc=00000f20...00000f39
DW_CFA_advance_loc:
DW_CFA_def_cfa_offset:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
00000038 0000001c 00000000 FDE cie=00000000 pc=00000f40...00000f83
DW_CFA_advance_loc:
DW_CFA_def_cfa_offset:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
DW_CFA_nop:
.debug_aranges contents:
Address Range Header: length = 0x0000003c, version = 0x0002, cu_offset =
0x00000000, addr_size = 0x08, seg_size = 0x00
[0x0000000100000f20 - 0x0000000100000f39)
[0x0000000100000f40 - 0x0000000100000f83)
.debug_line contents:
Line table prologue:
total_length: 0x00000052
version: 2
prologue_length: 0x0000001a
min_inst_length: 1
default_is_stmt: 1
line_base: -5
line_range: 14
opcode_base: 13
standard_opcode_lengths[DW_LNS_copy] = 0
standard_opcode_lengths[DW_LNS_advance_pc] = 1
standard_opcode_lengths[DW_LNS_advance_line] = 1
standard_opcode_lengths[DW_LNS_set_file] = 1
standard_opcode_lengths[DW_LNS_set_column] = 1
standard_opcode_lengths[DW_LNS_negate_stmt] = 0
standard_opcode_lengths[DW_LNS_set_basic_block] = 0
standard_opcode_lengths[DW_LNS_const_add_pc] = 0
standard_opcode_lengths[DW_LNS_fixed_advance_pc] = 1
standard_opcode_lengths[DW_LNS_set_prologue_end] = 0
standard_opcode_lengths[DW_LNS_set_epilogue_begin] = 0
standard_opcode_lengths[DW_LNS_set_isa] = 1
Dir Mod Time File Len File Name
---- ---------- ---------- ---------------------------
file_names[ 1] 0 0x00000000 0x00000000 a.c
Address Line Column File ISA Discriminator Flags
------------------ ------ ------ ------ --- ------------- -------------
0x0000000100000f20 3 0 1 0 0 is_stmt
0x0000000100000f28 4 2 1 0 0 is_stmt
prologue_end
0x0000000100000f31 5 2 1 0 0 is_stmt
0x0000000100000f39 5 2 1 0 0 is_stmt
end_sequence
0x0000000100000f40 8 0 1 0 0 is_stmt
0x0000000100000f4b 9 2 1 0 0 is_stmt
prologue_end
0x0000000100000f59 10 2 1 0 0 is_stmt
0x0000000100000f6b 11 2 1 0 0 is_stmt
0x0000000100000f78 12 1 1 0 0 is_stmt
0x0000000100000f83 12 1 1 0 0 is_stmt
end_sequence
.debug_line.dwo contents:
.debug_str contents:
0x00000000: ""
0x00000001: "clang version 3.6.0 (218128)"
0x0000001e: "<stdin>"
0x00000026: "/Users/kuba/llvm-tot-cmake-release"
0x00000049: "f"
0x0000004b: "main"
.debug_ranges contents:
.debug_pubnames contents:
length = 0x0000001d version = 0x0002 unit_offset = 0x00000000 unit_size =
0x0000004b
Offset Name
0x0000001e "f"
0x00000034 "main"
.debug_pubtypes contents:
.debug_gnu_pubnames contents:
.debug_gnu_pubtypes contents:
$
Kuba
On Thu, Sep 25, 2014 at 10:51 AM, David Blaikie <dblaikie at gmail.com> wrote:
>
>
> On Wed, Sep 24, 2014 at 12:27 PM, Kuba Brecka <kuba.brecka at gmail.com>
> wrote:
>
>> Sure. It works with my system's clang, but when using my just-built
>> ./bin/clang, the symbolizer doesn't give me any line information.
>>
>> $ cat a.c
>> #include <stdio.h>
>>
>> int f() {
>> printf("X");
>> return 0;
>> }
>>
>> int main() {
>> printf("1");
>> printf("2");
>> printf("3");
>> }
>> $ clang a.c -o a.out -gline-tables-only
>>
>
> A -cc1 command line would be helpful, not sure which -target I should use,
> etc.
>
>
>> $ nm a.out
>> 0000000100000000 T __mh_execute_header
>> 0000000100000f00 T _f
>> 0000000100000f30 T _main
>> U _printf
>> U dyld_stub_binder
>> $ echo "a.out 0x0000000100000f00" | ./bin/llvm-symbolizer
>> f
>> /Users/kuba/llvm-tot-cmake-release/a.c:3:0
>> $ echo "a.out 0x0000000100000f18" | ./bin/llvm-symbolizer
>> f
>> /Users/kuba/llvm-tot-cmake-release/a.c:5:2
>> $ ./bin/llvm-dwarfdump -debug-dump=line
>> a.out.dSYM/Contents/Resources/DWARF/a.out
>>
>
> The full dwarfdump, not just the line table, is probably necessary to
> investigate this - my change didn't modify the line table, it modified the
> compile units in the debug_info section (and added ranges back into the
> debug_ranges section).
>
>
>> a.out.dSYM/Contents/Resources/DWARF/a.out: file format Mach-O 64-bit
>> x86-64
>> .debug_line contents:
>> Line table prologue:
>> total_length: 0x00000052
>> version: 2
>> prologue_length: 0x0000001a
>> min_inst_length: 1
>> default_is_stmt: 1
>> line_base: -5
>> line_range: 14
>> opcode_base: 13
>> standard_opcode_lengths[DW_LNS_copy] = 0
>> standard_opcode_lengths[DW_LNS_advance_pc] = 1
>> standard_opcode_lengths[DW_LNS_advance_line] = 1
>> standard_opcode_lengths[DW_LNS_set_file] = 1
>> standard_opcode_lengths[DW_LNS_set_column] = 1
>> standard_opcode_lengths[DW_LNS_negate_stmt] = 0
>> standard_opcode_lengths[DW_LNS_set_basic_block] = 0
>> standard_opcode_lengths[DW_LNS_const_add_pc] = 0
>> standard_opcode_lengths[DW_LNS_fixed_advance_pc] = 1
>> standard_opcode_lengths[DW_LNS_set_prologue_end] = 0
>> standard_opcode_lengths[DW_LNS_set_epilogue_begin] = 0
>> standard_opcode_lengths[DW_LNS_set_isa] = 1
>> Dir Mod Time File Len File Name
>> ---- ---------- ---------- ---------------------------
>> file_names[ 1] 0 0x00000000 0x00000000 a.c
>> Address Line Column File ISA Discriminator Flags
>> ------------------ ------ ------ ------ --- ------------- -------------
>> 0x0000000100000f00 3 0 1 0 0 is_stmt
>> 0x0000000100000f0f 4 2 1 0 0 is_stmt
>> prologue_end
>> 0x0000000100000f18 5 2 1 0 0 is_stmt
>> 0x0000000100000f23 5 2 1 0 0 is_stmt
>> end_sequence
>> 0x0000000100000f30 8 0 1 0 0 is_stmt
>> 0x0000000100000f3f 9 2 1 0 0 is_stmt
>> prologue_end
>> 0x0000000100000f4d 10 2 1 0 0 is_stmt
>> 0x0000000100000f5e 11 2 1 0 0 is_stmt
>> 0x0000000100000f6a 12 1 1 0 0 is_stmt
>> 0x0000000100000f75 12 1 1 0 0 is_stmt
>> end_sequence
>>
>> $ ./bin/clang a.c -o a.out -gline-tables-only
>> warning: no debug symbols in executable (-arch x86_64)
>> $ echo "a.out 0x0000000100000f00" | ./bin/llvm-symbolizer
>> f
>> ??:0:0
>> $ echo "a.out 0x0000000100000f18" | ./bin/llvm-symbolizer
>> f
>> ??:0:0
>> $ ./bin/llvm-dwarfdump -debug-dump=line
>> a.out.dSYM/Contents/Resources/DWARF/a.out
>> a.out.dSYM/Contents/Resources/DWARF/a.out: file format Mach-O 64-bit
>> x86-64
>>
>>
>> .debug_line contents:
>> $
>>
>> Kuba
>>
>>
>> On Wed, Sep 24, 2014 at 12:10 PM, David Blaikie <dblaikie at gmail.com>
>> wrote:
>>
>>>
>>>
>>> On Wed, Sep 24, 2014 at 12:08 PM, Kuba Brecka <kuba.brecka at gmail.com>
>>> wrote:
>>>
>>>> I'm getting test failures for compiler-rt asan tests after this patch.
>>>> It seems the symbolizer stops working with -gline-tables-only on OS X:
>>>>
>>>
>>> Could you provide a simple reproduction? (a clang command line with a
>>> -target and an llvm-symbolizer invocation that should symbolize a
>>> particular instruction/offset in the binary, etc) and/or llvm-dwarfdump of
>>> a simple binary that fails symbolication when it shouldn't.
>>>
>>>
>>>>
>>>> FAIL: AddressSanitizer32 :: TestCases/use-after-free.cc (222 of 460)
>>>> ******************** TEST 'AddressSanitizer32 ::
>>>> TestCases/use-after-free.cc' FAILED ********************
>>>> Script:
>>>> --
>>>> /Users/kuba/llvm-tot-cmake-release/./bin/clang --driver-mode=g++
>>>> -fsanitize=address -mno-omit-leaf-frame-pointer -fno-omit-frame-pointer
>>>> -fno-optimize-sibling-calls -gline-tables-only -m32 -O0
>>>> /Users/kuba/llvm-tot/projects/compiler-rt/test/asan/TestCases/use-after-free.cc
>>>> -o
>>>> /Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp
>>>> && not
>>>> /Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp
>>>> 2>&1 | FileCheck
>>>> /Users/kuba/llvm-tot/projects/compiler-rt/test/asan/TestCases/use-after-free.cc
>>>> --check-prefix=CHECK-Darwin --check-prefix=CHECK
>>>> /Users/kuba/llvm-tot-cmake-release/./bin/clang --driver-mode=g++
>>>> -fsanitize=address -mno-omit-leaf-frame-pointer -fno-omit-frame-pointer
>>>> -fno-optimize-sibling-calls -gline-tables-only -m32 -O1
>>>> /Users/kuba/llvm-tot/projects/compiler-rt/test/asan/TestCases/use-after-free.cc
>>>> -o
>>>> /Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp
>>>> && not
>>>> /Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp
>>>> 2>&1 | FileCheck
>>>> /Users/kuba/llvm-tot/projects/compiler-rt/test/asan/TestCases/use-after-free.cc
>>>> --check-prefix=CHECK-Darwin --check-prefix=CHECK
>>>> /Users/kuba/llvm-tot-cmake-release/./bin/clang --driver-mode=g++
>>>> -fsanitize=address -mno-omit-leaf-frame-pointer -fno-omit-frame-pointer
>>>> -fno-optimize-sibling-calls -gline-tables-only -m32 -O2
>>>> /Users/kuba/llvm-tot/projects/compiler-rt/test/asan/TestCases/use-after-free.cc
>>>> -o
>>>> /Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp
>>>> && not
>>>> /Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp
>>>> 2>&1 | FileCheck
>>>> /Users/kuba/llvm-tot/projects/compiler-rt/test/asan/TestCases/use-after-free.cc
>>>> --check-prefix=CHECK-Darwin --check-prefix=CHECK
>>>> /Users/kuba/llvm-tot-cmake-release/./bin/clang --driver-mode=g++
>>>> -fsanitize=address -mno-omit-leaf-frame-pointer -fno-omit-frame-pointer
>>>> -fno-optimize-sibling-calls -gline-tables-only -m32 -O3
>>>> /Users/kuba/llvm-tot/projects/compiler-rt/test/asan/TestCases/use-after-free.cc
>>>> -o
>>>> /Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp
>>>> && not
>>>> /Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp
>>>> 2>&1 | FileCheck
>>>> /Users/kuba/llvm-tot/projects/compiler-rt/test/asan/TestCases/use-after-free.cc
>>>> --check-prefix=CHECK-Darwin --check-prefix=CHECK
>>>> --
>>>> Exit Code: 1
>>>>
>>>> Command Output (stdout):
>>>> --
>>>> warning: no debug symbols in executable (-arch i386)
>>>>
>>>> --
>>>> Command Output (stderr):
>>>> --
>>>> /Users/kuba/llvm-tot/projects/compiler-rt/test/asan/TestCases/use-after-free.cc:15:12:
>>>> error: expected string not found in input
>>>> // CHECK: {{ #0 0x.* in main .*use-after-free.cc:}}[[@LINE-4]]
>>>> ^
>>>> <stdin>:4:2: note: scanning from here
>>>> #0 0x75e5f in main
>>>> (/Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp+0x1e5f)
>>>> ^
>>>> <stdin>:4:2: note: with expression "@LINE-4" equal to "11"
>>>> #0 0x75e5f in main
>>>> (/Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp+0x1e5f)
>>>> ^
>>>> <stdin>:4:97: note: possible intended match here
>>>> #0 0x75e5f in main
>>>> (/Users/kuba/llvm-tot-cmake-release/projects/compiler-rt/test/asan/32bitConfig/TestCases/Output/use-after-free.cc.tmp+0x1e5f)
>>>>
>>>>
>>>> Kuba
>>>>
>>>> Author: dblaikie
>>>>> Date: Fri Sep 19 12:03:16 2014
>>>>> New Revision: 218129
>>>>> URL: http://llvm.org/viewvc/llvm-project?rev=218129&view=rev
>>>>> Log:
>>>>> Omit DW_TAG_subprograms for subprograms without inlined subroutines
>>>>> when producing -gmlt data
>>>>> To reduce the size of -gmlt data, skip the subprograms without any
>>>>> inlined subroutines. Since we've now got the ability to make these
>>>>> determinations in the backend (funnily enough - we added the flag so we
>>>>> wouldn't produce ranges under -gmlt, but with this change we use the
>>>>> flag, but go back to producing ranges under -gmlt).
>>>>> Instead, just produce CU ranges to inform the consumer which parts of
>>>>> the code are described by this CU's line table. Tools could inspect the
>>>>> line table directly to compute the range, but the CU ranges only seem
>>>>> to
>>>>> be about 0.5% of object/executable size, so I'm not too worried about
>>>>> teaching llvm-symbolizer that trick just yet - it's certainly a
>>>>> possible
>>>>> piece of future work.
>>>>> Update an llvm-symbolizer test just to demonstrate that this schema is
>>>>> acceptable there (if it wasn't, the compiler-rt tests would catch this,
>>>>> but good to have an in-llvm-tree test for llvm-symbolizer's behavior
>>>>> here)
>>>>> Building the clang binary with -gmlt with this patch reduces the total
>>>>> size of object files by 5.1% (5.56% without ranges) without compression
>>>>> and the executable by 4.37% (4.75% without ranges).
>>>>> Modified:
>>>>> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
>>>>> llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
>>>>> llvm/trunk/test/DebugInfo/Inputs/dwarfdump-inl-test.elf-x86-64
>>>>> llvm/trunk/test/DebugInfo/gmlt.ll
>>>>> llvm/trunk/test/DebugInfo/llvm-symbolizer.test
>>>>
>>>>
>>>
>>
>
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