bionic (1) llvm-symbolizer-9.1.gz
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 command-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 command-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
assumed. 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, following any “DATA” or “CODE” prefix.
EXAMPLES
All of the following examples use the following two source files as input. 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
OPTIONS
--adjust-vma <offset>
Add the specified offset to object file addresses when performing lookups. This can be used to
perform lookups as if the object were relocated by the offset.
--basenames, -s
Strip directories when printing the file 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, respectively). Defaults to linkage.
--help, -h
Show help and usage for this command.
--help-list
Show help and usage for this command without grouping the options into categories.
--inlining, --inlines, -i
If a source code location is in an inlined function, prints all the inlined frames. Defaults to
true.
--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>
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 and --use-symbol-table is on.
$ 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 -i=0
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 -i=0
baz() at /tmp/test.cpp:11
foo() at /tmp/test.cpp:6
--pretty-print, -p
Print human readable output. If --inlining is specified, the enclosing scope is prefixed by
(inlined by).
$ 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=2
baz()
/tmp/test.cpp:11:0
10 : volatile int k = 42;
11 >: return foz() + k;
12 : }
--use-symbol-table
Prefer function names stored in symbol table to function names in debug info sections. Defaults to
true.
--verbose
Print verbose line and column information.
$ llvm-symbolizer --obj=inlined.elf --verbose 0x4004be
baz()
Filename: /tmp/test.cpp
Function start line: 9
Line: 11
Column: 18
main
Filename: /tmp/test.cpp
Function start line: 14
Line: 15
Column: 0
--version
Print version information for the tool.
@<FILE>
Read command-line options from response file <FILE>.
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
architecture by writing binary_name:arch_name in the input (see example 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 location, 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
2003-2020, LLVM Project