LLVM-SYMBOLIZER(1) LLVM LLVM-SYMBOLIZER(1)
NAME
llvm-symbolizer - convert addresses into source code locations
SYNOPSIS
llvm-symbolizer [options] [addresses…]
DESCRIPTION
llvm-symbolizer reads object file names and addresses from the com-
mand-line and prints corresponding source code locations to standard
output.
If no address is specified on the command-line, it reads the addresses
from standard input. If no object file is specified on the com-
mand-line, but addresses are, or if at any time an input value is not
recognized, the input is simply echoed to the output.
A positional argument or standard input value can be preceded by “DATA”
or “CODE” to indicate that the address should be symbolized as data or
executable code respectively. If neither is specified, “CODE” is as-
sumed. DATA is symbolized as address and symbol size rather than line
number.
Object files can be specified together with the addresses either on
standard input or as positional arguments on the command-line, follow-
ing any “DATA” or “CODE” prefix.
llvm-symbolizer parses options from the environment variable LLVM_SYM-
BOLIZER_OPTS after parsing options from the command line. LLVM_SYMBOL-
IZER_OPTS is primarily useful for supplementing the command-line op-
tions when llvm-symbolizer is invoked by another program or runtime.
EXAMPLES
All of the following examples use the following two source files as in-
put. They use a mixture of C-style and C++-style linkage to illustrate
how these names are printed differently (see --demangle).
// test.h
extern "C" inline int foz() {
return 1234;
}
// test.cpp
#include "test.h"
int bar=42;
int foo() {
return bar;
}
int baz() {
volatile int k = 42;
return foz() + k;
}
int main() {
return foo() + baz();
}
These files are built as follows:
$ clang -g test.cpp -o test.elf
$ clang -g -O2 test.cpp -o inlined.elf
Example 1 - addresses and object on command-line:
$ llvm-symbolizer --obj=test.elf 0x4004d0 0x400490
foz
/tmp/test.h:1:0
baz()
/tmp/test.cpp:11:0
Example 2 - addresses on standard input:
$ cat addr.txt
0x4004a0
0x400490
0x4004d0
$ llvm-symbolizer --obj=test.elf < addr.txt
main
/tmp/test.cpp:15:0
baz()
/tmp/test.cpp:11:0
foz
/tmp/./test.h:1:0
Example 3 - object specified with address:
$ llvm-symbolizer "test.elf 0x400490" "inlined.elf 0x400480"
baz()
/tmp/test.cpp:11:0
foo()
/tmp/test.cpp:8:10
$ cat addr2.txt
test.elf 0x4004a0
inlined.elf 0x400480
$ llvm-symbolizer < addr2.txt
main
/tmp/test.cpp:15:0
foo()
/tmp/test.cpp:8:10
Example 4 - CODE and DATA prefixes:
$ llvm-symbolizer --obj=test.elf "CODE 0x400490" "DATA 0x601028"
baz()
/tmp/test.cpp:11:0
bar
6295592 4
$ cat addr3.txt
CODE test.elf 0x4004a0
DATA inlined.elf 0x601028
$ llvm-symbolizer < addr3.txt
main
/tmp/test.cpp:15:0
bar
6295592 4
Example 5 - path-style options:
This example uses the same source file as above, but the source file’s
full path is /tmp/foo/test.cpp and is compiled as follows. The first
case shows the default absolute path, the second –basenames, and the
third shows –relativenames.
$ pwd
/tmp
$ clang -g foo/test.cpp -o test.elf
$ llvm-symbolizer --obj=test.elf 0x4004a0
main
/tmp/foo/test.cpp:15:0
$ llvm-symbolizer --obj=test.elf 0x4004a0 --basenames
main
test.cpp:15:0
$ llvm-symbolizer --obj=test.elf 0x4004a0 --relativenames
main
foo/test.cpp:15:0
OPTIONS
--adjust-vma <offset>
Add the specified offset to object file addresses when perform-
ing lookups. This can be used to perform lookups as if the ob-
ject were relocated by the offset.
--basenames, -s
Print just the file’s name without any directories, instead of
the absolute path.
--demangle, -C
Print demangled function names, if the names are mangled (e.g.
the mangled name _Z3bazv becomes baz(), whilst the non-mangled
name foz is printed as is). Defaults to true.
--dwp <path>
Use the specified DWP file at <path> for any CUs that have split
DWARF debug data.
--fallback-debug-path <path>
When a separate file contains debug data, and is referenced by a
GNU debug link section, use the specified path as a basis for
locating the debug data if it cannot be found relative to the
object.
--functions [=<none|short|linkage>], -f
Specify the way function names are printed (omit function name,
print short function name, or print full linkage name, respec-
tively). Defaults to linkage.
--help, -h
Show help and usage for this command.
--inlining, --inlines, -i
If a source code location is in an inlined function, prints all
the inlined frames. This is the default.
--no-inlines
Don’t print inlined frames.
--no-demangle
Don’t print demangled function names.
--obj <path>, --exe, -e
Path to object file to be symbolized. If - is specified, read
the object directly from the standard input stream.
--output-style <LLVM|GNU|JSON>
Specify the preferred output style. Defaults to LLVM. When the
output style is set to GNU, the tool follows the style of GNU’s
addr2line. The differences from the LLVM style are:
• Does not print the column of a source code location.
• Does not add an empty line after the report for an address.
• Does not replace the name of an inlined function with the name
of the topmost caller when inlined frames are not shown.
• Prints an address’s debug-data discriminator when it is
non-zero. One way to produce discriminators is to compile with
clang’s -fdebug-info-for-profiling.
JSON style provides a machine readable output in JSON. If ad-
dresses are
supplied via stdin, the output JSON will be a series of
individual objects. Otherwise, all results will be con-
tained in a single array.
$ llvm-symbolizer --obj=inlined.elf 0x4004be 0x400486 -p
baz() at /tmp/test.cpp:11:18
(inlined by) main at /tmp/test.cpp:15:0
foo() at /tmp/test.cpp:6:3
$ llvm-symbolizer --output-style=LLVM --obj=inlined.elf 0x4004be 0x400486 -p --no-inlines
main at /tmp/test.cpp:11:18
foo() at /tmp/test.cpp:6:3
$ llvm-symbolizer --output-style=GNU --obj=inlined.elf 0x4004be 0x400486 -p --no-inlines
baz() at /tmp/test.cpp:11
foo() at /tmp/test.cpp:6
$ clang -g -fdebug-info-for-profiling test.cpp -o profiling.elf
$ llvm-symbolizer --output-style=GNU --obj=profiling.elf 0x401167 -p --no-inlines
main at /tmp/test.cpp:15 (discriminator 2)
$ llvm-symbolizer --output-style=JSON --obj=inlined.elf 0x4004be 0x400486 -p
[
{
"Address": "0x4004be",
"ModuleName": "inlined.elf",
"Symbol": [
{
"Column": 18,
"Discriminator": 0,
"FileName": "/tmp/test.cpp",
"FunctionName": "baz()",
"Line": 11,
"StartAddress": "0x4004be",
"StartFileName": "/tmp/test.cpp",
"StartLine": 9
},
{
"Column": 0,
"Discriminator": 0,
"FileName": "/tmp/test.cpp",
"FunctionName": "main",
"Line": 15,
"StartAddress": "0x4004be",
"StartFileName": "/tmp/test.cpp",
"StartLine": 14
}
]
},
{
"Address": "0x400486",
"ModuleName": "inlined.elf",
"Symbol": [
{
"Column": 3,
"Discriminator": 0,
"FileName": "/tmp/test.cpp",
"FunctionName": "foo()",
"Line": 6,
"StartAddress": "0x400486",
"StartFileName": "/tmp/test.cpp",
"StartLine": 5
}
]
}
]
--pretty-print, -p
Print human readable output. If --inlining is specified, the en-
closing scope is prefixed by (inlined by). For JSON output, the
option will cause JSON to be indented and split over new lines.
Otherwise, the JSON output will be printed in a compact form.
$ llvm-symbolizer --obj=inlined.elf 0x4004be --inlining --pretty-print
baz() at /tmp/test.cpp:11:18
(inlined by) main at /tmp/test.cpp:15:0
--print-address, --addresses, -a
Print address before the source code location. Defaults to
false.
$ llvm-symbolizer --obj=inlined.elf --print-address 0x4004be
0x4004be
baz()
/tmp/test.cpp:11:18
main
/tmp/test.cpp:15:0
$ llvm-symbolizer --obj=inlined.elf 0x4004be --pretty-print --print-address
0x4004be: baz() at /tmp/test.cpp:11:18
(inlined by) main at /tmp/test.cpp:15:0
--print-source-context-lines <N>
Print N lines of source context for each symbolized address.
$ llvm-symbolizer --obj=test.elf 0x400490 --print-source-context-lines=3
baz()
/tmp/test.cpp:11:0
10 : volatile int k = 42;
11 >: return foz() + k;
12 : }
--relativenames
Print the file’s path relative to the compilation directory, in-
stead of the absolute path. If the command-line to the compiler
included the full path, this will be the same as the default.
--verbose
Print verbose address, line and column information.
$ llvm-symbolizer --obj=inlined.elf --verbose 0x4004be
baz()
Filename: /tmp/test.cpp
Function start filename: /tmp/test.cpp
Function start line: 9
Function start address: 0x4004b6
Line: 11
Column: 18
main
Filename: /tmp/test.cpp
Function start filename: /tmp/test.cpp
Function start line: 14
Function start address: 0x4004b0
Line: 15
Column: 18
--version, -v
Print version information for the tool.
@<FILE>
Read command-line options from response file <FILE>.
WINDOWS/PDB SPECIFIC OPTIONS
--dia Use the Windows DIA SDK for symbolization. If the DIA SDK is not
found, llvm-symbolizer will fall back to the native implementa-
tion.
MACH-O SPECIFIC OPTIONS
--default-arch <arch>
If a binary contains object files for multiple architectures
(e.g. it is a Mach-O universal binary), symbolize the object
file for a given architecture. You can also specify the archi-
tecture by writing binary_name:arch_name in the input (see exam-
ple below). If the architecture is not specified in either way,
the address will not be symbolized. Defaults to empty string.
$ cat addr.txt
/tmp/mach_universal_binary:i386 0x1f84
/tmp/mach_universal_binary:x86_64 0x100000f24
$ llvm-symbolizer < addr.txt
_main
/tmp/source_i386.cc:8
_main
/tmp/source_x86_64.cc:8
--dsym-hint <path/to/file.dSYM>
If the debug info for a binary isn’t present in the default lo-
cation, look for the debug info at the .dSYM path provided via
this option. This flag can be used multiple times.
EXIT STATUS
llvm-symbolizer returns 0. Other exit codes imply an internal program
error.
SEE ALSO
llvm-addr2line(1)
AUTHOR
Maintained by the LLVM Team (https://llvm.org/).
COPYRIGHT
2003-2023, LLVM Project
14 2023-02-17 LLVM-SYMBOLIZER(1)
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