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2e662e9f46
As detailed in https://bugs.llvm.org/show_bug.cgi?id=42253, there were a number of issues in the llvm-symbolizer documentation. This patch fixes them by: 1. Adding [addresses...] to the synopsis, and matching the formatting of other tools. 2. Rewriting the description to fix grammar issues and mention other usage options. 3. Rewriting the examples to be easier to read. 4. Re-ordering the options into alphabetical order. 5. Improving the text of some of the option descriptions, and adding some examples to individual options. 6. Splitting the Mach-O options into a separate section of the document. 7. Standardizing on double dashes for long options throughout the file. 8. Adding a reference to the llvm-addr2line document. Reviewed by: mtrent, ikudrin Differential Revision: https://reviews.llvm.org/D63651 llvm-svn: 364410
353 lines
8.3 KiB
ReStructuredText
353 lines
8.3 KiB
ReStructuredText
llvm-symbolizer - convert addresses into source code locations
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==============================================================
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SYNOPSIS
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--------
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:program:`llvm-symbolizer` [*options*] [*addresses...*]
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DESCRIPTION
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-----------
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:program:`llvm-symbolizer` reads object file names and addresses from the
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command-line and prints corresponding source code locations to standard output.
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If no address is specified on the command-line, it reads the addresses from
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standard input. If no object file is specified on the command-line, but
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addresses are, or if at any time an input value is not recognized, the input is
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simply echoed to the output.
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A positional argument or standard input value can be preceded by "DATA" or
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"CODE" to indicate that the address should be symbolized as data or executable
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code respectively. If neither is specified, "CODE" is assumed. DATA is
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symbolized as address and symbol size rather than line number.
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Object files can be specified together with the addresses either on standard
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input or as positional arguments on the command-line, following any "DATA" or
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"CODE" prefix.
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EXAMPLES
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--------
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All of the following examples use the following two source files as input. They
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use a mixture of C-style and C++-style linkage to illustrate how these names are
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printed differently (see :option:`--demangle`).
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.. code-block:: c
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// test.h
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extern "C" inline int foz() {
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return 1234;
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}
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.. code-block:: c
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// test.cpp
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#include "test.h"
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int bar=42;
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int foo() {
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return bar;
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}
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int baz() {
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volatile int k = 42;
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return foz() + k;
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}
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int main() {
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return foo() + baz();
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}
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These files are built as follows:
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.. code-block:: console
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$ clang -g test.cpp -o test.elf
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$ clang -g -O2 test.cpp -o inlined.elf
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Example 1 - addresses and object on command-line:
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.. code-block:: console
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$ llvm-symbolizer --obj=test.elf 0x4004d0 0x400490
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foz
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/tmp/test.h:1:0
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baz()
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/tmp/test.cpp:11:0
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Example 2 - addresses on standard input:
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.. code-block:: console
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$ cat addr.txt
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0x4004a0
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0x400490
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0x4004d0
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$ llvm-symbolizer --obj=test.elf < addr.txt
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main
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/tmp/test.cpp:15:0
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baz()
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/tmp/test.cpp:11:0
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foz
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/tmp/./test.h:1:0
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Example 3 - object specified with address:
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.. code-block:: console
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$ llvm-symbolizer "test.elf 0x400490" "inlined.elf 0x400480"
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baz()
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/tmp/test.cpp:11:0
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foo()
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/tmp/test.cpp:8:10
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$ cat addr2.txt
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test.elf 0x4004a0
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inlined.elf 0x400480
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$ llvm-symbolizer < addr2.txt
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main
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/tmp/test.cpp:15:0
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foo()
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/tmp/test.cpp:8:10
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Example 4 - CODE and DATA prefixes:
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.. code-block:: console
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$ llvm-symbolizer --obj=test.elf "CODE 0x400490" "DATA 0x601028"
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baz()
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/tmp/test.cpp:11:0
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bar
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6295592 4
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$ cat addr3.txt
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CODE test.elf 0x4004a0
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DATA inlined.elf 0x601028
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$ llvm-symbolizer < addr3.txt
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main
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/tmp/test.cpp:15:0
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bar
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6295592 4
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OPTIONS
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-------
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.. option:: --adjust-vma <offset>
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Add the specified offset to object file addresses when performing lookups.
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This can be used to perform lookups as if the object were relocated by the
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offset.
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.. option:: --basenames, -s
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Strip directories when printing the file path.
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.. _llvm-symbolizer-opt-C:
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.. option:: --demangle, -C
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Print demangled function names, if the names are mangled (e.g. the mangled
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name `_Z3bazv` becomes `baz()`, whilst the non-mangled name `foz` is printed
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as is). Defaults to true.
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.. option:: --dwp <path>
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Use the specified DWP file at ``<path>`` for any CUs that have split DWARF
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debug data.
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.. option:: --fallback-debug-path <path>
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When a separate file contains debug data, and is referenced by a GNU debug
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link section, use the specified path as a basis for locating the debug data if
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it cannot be found relative to the object.
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.. _llvm-symbolizer-opt-f:
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.. option:: --functions [<none|short|linkage>], -f
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Specify the way function names are printed (omit function name, print short
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function name, or print full linkage name, respectively). Defaults to
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``linkage``.
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.. option:: --help, -h
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Show help and usage for this command.
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.. option:: --help-list
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Show help and usage for this command without grouping the options into categories.
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.. _llvm-symbolizer-opt-i:
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.. option:: --inlining, --inlines, -i
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If a source code location is in an inlined function, prints all the inlined
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frames. Defaults to true.
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.. option:: --no-demangle
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Don't print demangled function names.
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.. option:: --obj <path>, --exe, -e
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Path to object file to be symbolized. If ``-`` is specified, read the object
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directly from the standard input stream.
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.. _llvm-symbolizer-opt-output-style:
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.. option:: --output-style <LLVM|GNU>
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Specify the preferred output style. Defaults to ``LLVM``. When the output
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style is set to ``GNU``, the tool follows the style of GNU's **addr2line**.
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The differences from the ``LLVM`` style are:
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* Does not print column of a source code location.
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* Does not add an empty line after the report for an address.
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* Does not replace the name of an inlined function with the name of the
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topmost caller when inlined frames are not shown and :option:`--use-symbol-table`
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is on.
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.. code-block:: console
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$ llvm-symbolizer --obj=inlined.elf 0x4004be 0x400486 -p
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baz() at /tmp/test.cpp:11:18
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(inlined by) main at /tmp/test.cpp:15:0
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foo() at /tmp/test.cpp:6:3
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$ llvm-symbolizer --output-style=LLVM --obj=inlined.elf 0x4004be 0x400486 -p -i=0
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main at /tmp/test.cpp:11:18
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foo() at /tmp/test.cpp:6:3
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$ llvm-symbolizer --output-style=GNU --obj=inlined.elf 0x4004be 0x400486 -p -i=0
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baz() at /tmp/test.cpp:11
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foo() at /tmp/test.cpp:6
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.. option:: --pretty-print, -p
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Print human readable output. If :option:`--inlining` is specified, the
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enclosing scope is prefixed by (inlined by).
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.. code-block:: console
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$ llvm-symbolizer --obj=inlined.elf 0x4004be --inlining --pretty-print
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baz() at /tmp/test.cpp:11:18
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(inlined by) main at /tmp/test.cpp:15:0
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.. option:: --print-address, --addresses, -a
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Print address before the source code location. Defaults to false.
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.. code-block:: console
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$ llvm-symbolizer --obj=inlined.elf --print-address 0x4004be
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0x4004be
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baz()
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/tmp/test.cpp:11:18
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main
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/tmp/test.cpp:15:0
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$ llvm-symbolizer --obj=inlined.elf 0x4004be --pretty-print --print-address
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0x4004be: baz() at /tmp/test.cpp:11:18
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(inlined by) main at /tmp/test.cpp:15:0
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.. option:: --print-source-context-lines <N>
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Print ``N`` lines of source context for each symbolized address.
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.. code-block:: console
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$ llvm-symbolizer --obj=test.elf 0x400490 --print-source-context-lines=2
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baz()
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/tmp/test.cpp:11:0
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10 : volatile int k = 42;
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11 >: return foz() + k;
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12 : }
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.. _llvm-symbolizer-opt-use-symbol-table:
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.. option:: --use-symbol-table
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Prefer function names stored in symbol table to function names in debug info
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sections. Defaults to true.
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.. option:: --verbose
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Print verbose line and column information.
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.. code-block:: console
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$ llvm-symbolizer --obj=inlined.elf --verbose 0x4004be
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baz()
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Filename: /tmp/test.cpp
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Function start line: 9
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Line: 11
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Column: 18
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main
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Filename: /tmp/test.cpp
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Function start line: 14
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Line: 15
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Column: 0
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.. option:: --version
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Print version information for the tool.
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.. option:: @<FILE>
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Read command-line options from response file `<FILE>`.
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MACH-O SPECIFIC OPTIONS
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-----------------------
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.. option:: --default-arch <arch>
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If a binary contains object files for multiple architectures (e.g. it is a
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Mach-O universal binary), symbolize the object file for a given architecture.
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You can also specify the architecture by writing ``binary_name:arch_name`` in
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the input (see example below). If the architecture is not specified in either
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way, the address will not be symbolized. Defaults to empty string.
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.. code-block:: console
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$ cat addr.txt
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/tmp/mach_universal_binary:i386 0x1f84
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/tmp/mach_universal_binary:x86_64 0x100000f24
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$ llvm-symbolizer < addr.txt
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_main
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/tmp/source_i386.cc:8
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_main
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/tmp/source_x86_64.cc:8
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.. option:: --dsym-hint <path/to/file.dSYM>
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If the debug info for a binary isn't present in the default location, look for
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the debug info at the .dSYM path provided via this option. This flag can be
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used multiple times.
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EXIT STATUS
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-----------
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:program:`llvm-symbolizer` returns 0. Other exit codes imply an internal program
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error.
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SEE ALSO
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--------
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:manpage:`llvm-addr2line(1)`
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