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Remappings involving extern "C" names were already supported in the context of <local-name>s, but this support didn't work for remapping the complete mangling itself. (Eg, we would remap X<foo> but not foo itself, if foo is an extern "C" function.)
102 lines
3.1 KiB
ReStructuredText
102 lines
3.1 KiB
ReStructuredText
llvm-cxxmap - Mangled name remapping tool
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=========================================
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.. program:: llvm-cxxmap
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SYNOPSIS
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--------
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:program:`llvm-cxxmap` [*options*] *symbol-file-1* *symbol-file-2*
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DESCRIPTION
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-----------
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The :program:`llvm-cxxmap` tool performs fuzzy matching of C++ mangled names,
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based on a file describing name components that should be considered equivalent.
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The symbol files should contain a list of C++ mangled names (one per line).
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Blank lines and lines starting with ``#`` are ignored. The output is a list
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of pairs of equivalent symbols, one per line, of the form
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.. code-block:: none
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<symbol-1> <symbol-2>
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where ``<symbol-1>`` is a symbol from *symbol-file-1* and ``<symbol-2>`` is
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a symbol from *symbol-file-2*. Mappings for which the two symbols are identical
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are omitted.
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OPTIONS
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-------
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.. program:: llvm-cxxmap
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.. option:: -remapping-file=file, -r=file
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Specify a file containing a list of equivalence rules that should be used
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to determine whether two symbols are equivalent. Required.
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See :ref:`remapping-file`.
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.. option:: -output=file, -o=file
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Specify a file to write the list of matched names to. If unspecified, the
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list will be written to stdout.
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.. option:: -Wambiguous
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Produce a warning if there are multiple equivalent (but distinct) symbols in
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*symbol-file-2*.
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.. option:: -Wincomplete
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Produce a warning if *symbol-file-1* contains a symbol for which there is no
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equivalent symbol in *symbol-file-2*.
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.. _remapping-file:
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REMAPPING FILE
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--------------
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The remapping file is a text file containing lines of the form
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.. code-block:: none
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fragmentkind fragment1 fragment2
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where ``fragmentkind`` is one of ``name``, ``type``, or ``encoding``,
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indicating whether the following mangled name fragments are
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<`name <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.name>`_>s,
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<`type <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.type>`_>s, or
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<`encoding <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.encoding>`_>s,
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respectively.
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Blank lines and lines starting with ``#`` are ignored.
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Unmangled C names can be expressed as an ``encoding`` that is a (length-prefixed)
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<`source-name <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.source-name>`_>:
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.. code-block:: none
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# C function "void foo_bar()" is remapped to C++ function "void foo::bar()".
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encoding 7foo_bar _Z3foo3barv
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For convenience, built-in <substitution>s such as ``St`` and ``Ss``
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are accepted as <name>s (even though they technically are not <name>s).
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For example, to specify that ``absl::string_view`` and ``std::string_view``
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should be treated as equivalent, the following remapping file could be used:
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.. code-block:: none
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# absl::string_view is considered equivalent to std::string_view
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type N4absl11string_viewE St17basic_string_viewIcSt11char_traitsIcEE
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# std:: might be std::__1:: in libc++ or std::__cxx11:: in libstdc++
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name St St3__1
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name St St7__cxx11
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.. note::
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Symbol remapping is currently only supported for C++ mangled names
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following the Itanium C++ ABI mangling scheme. This covers all C++ targets
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supported by Clang other than Windows targets.
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