491 lines
13 KiB
C
491 lines
13 KiB
C
/* Demangler for GNU C++
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Copyright (C) 1989-2019 Free Software Foundation, Inc.
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Written by James Clark (jjc@jclark.uucp)
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Rewritten by Fred Fish (fnf@cygnus.com) for ARM and Lucid demangling
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Modified by Satish Pai (pai@apollo.hp.com) for HP demangling
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Library General Public
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License, the Free Software Foundation gives you unlimited permission
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to link the compiled version of this file into combinations with other
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programs, and to distribute those combinations without any restriction
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coming from the use of this file. (The Library Public License
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restrictions do apply in other respects; for example, they cover
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modification of the file, and distribution when not linked into a
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combined executable.)
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* This file lives in both GCC and libiberty. When making changes, please
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try not to break either. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "safe-ctype.h"
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#include <string.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#else
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void * malloc ();
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void * realloc ();
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#endif
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#include <demangle.h>
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#undef CURRENT_DEMANGLING_STYLE
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#define CURRENT_DEMANGLING_STYLE options
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#include "libiberty.h"
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enum demangling_styles current_demangling_style = auto_demangling;
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const struct demangler_engine libiberty_demanglers[] =
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{
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{
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NO_DEMANGLING_STYLE_STRING,
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no_demangling,
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"Demangling disabled"
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}
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,
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{
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AUTO_DEMANGLING_STYLE_STRING,
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auto_demangling,
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"Automatic selection based on executable"
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}
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,
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{
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GNU_V3_DEMANGLING_STYLE_STRING,
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gnu_v3_demangling,
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"GNU (g++) V3 (Itanium C++ ABI) style demangling"
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}
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,
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{
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JAVA_DEMANGLING_STYLE_STRING,
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java_demangling,
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"Java style demangling"
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}
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,
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{
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GNAT_DEMANGLING_STYLE_STRING,
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gnat_demangling,
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"GNAT style demangling"
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}
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,
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{
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DLANG_DEMANGLING_STYLE_STRING,
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dlang_demangling,
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"DLANG style demangling"
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}
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,
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{
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RUST_DEMANGLING_STYLE_STRING,
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rust_demangling,
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"Rust style demangling"
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}
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,
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{
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NULL, unknown_demangling, NULL
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}
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};
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/* Add a routine to set the demangling style to be sure it is valid and
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allow for any demangler initialization that maybe necessary. */
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enum demangling_styles
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cplus_demangle_set_style (enum demangling_styles style)
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{
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const struct demangler_engine *demangler = libiberty_demanglers;
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for (; demangler->demangling_style != unknown_demangling; ++demangler)
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if (style == demangler->demangling_style)
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{
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current_demangling_style = style;
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return current_demangling_style;
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}
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return unknown_demangling;
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}
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/* Do string name to style translation */
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enum demangling_styles
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cplus_demangle_name_to_style (const char *name)
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{
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const struct demangler_engine *demangler = libiberty_demanglers;
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for (; demangler->demangling_style != unknown_demangling; ++demangler)
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if (strcmp (name, demangler->demangling_style_name) == 0)
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return demangler->demangling_style;
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return unknown_demangling;
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}
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/* char *cplus_demangle (const char *mangled, int options)
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If MANGLED is a mangled function name produced by GNU C++, then
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a pointer to a @code{malloc}ed string giving a C++ representation
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of the name will be returned; otherwise NULL will be returned.
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It is the caller's responsibility to free the string which
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is returned.
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Note that any leading underscores, or other such characters prepended by
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the compilation system, are presumed to have already been stripped from
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MANGLED. */
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char *
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cplus_demangle (const char *mangled, int options)
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{
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char *ret;
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if (current_demangling_style == no_demangling)
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return xstrdup (mangled);
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if ((options & DMGL_STYLE_MASK) == 0)
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options |= (int) current_demangling_style & DMGL_STYLE_MASK;
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/* The V3 ABI demangling is implemented elsewhere. */
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if (GNU_V3_DEMANGLING || RUST_DEMANGLING || AUTO_DEMANGLING)
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{
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ret = cplus_demangle_v3 (mangled, options);
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if (GNU_V3_DEMANGLING)
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return ret;
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if (ret)
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{
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/* Rust symbols are GNU_V3 mangled plus some extra subtitutions.
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The subtitutions are always smaller, so do in place changes. */
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if (rust_is_mangled (ret))
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rust_demangle_sym (ret);
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else if (RUST_DEMANGLING)
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{
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free (ret);
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ret = NULL;
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}
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}
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if (ret || RUST_DEMANGLING)
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return ret;
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}
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if (JAVA_DEMANGLING)
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{
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ret = java_demangle_v3 (mangled);
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if (ret)
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return ret;
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}
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if (GNAT_DEMANGLING)
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return ada_demangle (mangled, options);
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if (DLANG_DEMANGLING)
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{
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ret = dlang_demangle (mangled, options);
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if (ret)
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return ret;
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}
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return (ret);
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}
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char *
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rust_demangle (const char *mangled, int options)
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{
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/* Rust symbols are GNU_V3 mangled plus some extra subtitutions. */
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char *ret = cplus_demangle_v3 (mangled, options);
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/* The Rust subtitutions are always smaller, so do in place changes. */
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if (ret != NULL)
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{
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if (rust_is_mangled (ret))
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rust_demangle_sym (ret);
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else
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{
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free (ret);
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ret = NULL;
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}
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}
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return ret;
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}
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/* Demangle ada names. The encoding is documented in gcc/ada/exp_dbug.ads. */
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char *
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ada_demangle (const char *mangled, int option ATTRIBUTE_UNUSED)
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{
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int len0;
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const char* p;
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char *d;
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char *demangled = NULL;
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/* Discard leading _ada_, which is used for library level subprograms. */
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if (strncmp (mangled, "_ada_", 5) == 0)
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mangled += 5;
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/* All ada unit names are lower-case. */
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if (!ISLOWER (mangled[0]))
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goto unknown;
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/* Most of the demangling will trivially remove chars. Operator names
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may add one char but because they are always preceeded by '__' which is
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replaced by '.', they eventually never expand the size.
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A few special names such as '___elabs' add a few chars (at most 7), but
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they occur only once. */
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len0 = strlen (mangled) + 7 + 1;
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demangled = XNEWVEC (char, len0);
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d = demangled;
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p = mangled;
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while (1)
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{
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/* An entity names is expected. */
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if (ISLOWER (*p))
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{
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/* An identifier, which is always lower case. */
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do
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*d++ = *p++;
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while (ISLOWER(*p) || ISDIGIT (*p)
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|| (p[0] == '_' && (ISLOWER (p[1]) || ISDIGIT (p[1]))));
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}
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else if (p[0] == 'O')
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{
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/* An operator name. */
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static const char * const operators[][2] =
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{{"Oabs", "abs"}, {"Oand", "and"}, {"Omod", "mod"},
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{"Onot", "not"}, {"Oor", "or"}, {"Orem", "rem"},
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{"Oxor", "xor"}, {"Oeq", "="}, {"One", "/="},
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{"Olt", "<"}, {"Ole", "<="}, {"Ogt", ">"},
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{"Oge", ">="}, {"Oadd", "+"}, {"Osubtract", "-"},
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{"Oconcat", "&"}, {"Omultiply", "*"}, {"Odivide", "/"},
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{"Oexpon", "**"}, {NULL, NULL}};
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int k;
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for (k = 0; operators[k][0] != NULL; k++)
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{
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size_t slen = strlen (operators[k][0]);
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if (strncmp (p, operators[k][0], slen) == 0)
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{
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p += slen;
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slen = strlen (operators[k][1]);
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*d++ = '"';
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memcpy (d, operators[k][1], slen);
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d += slen;
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*d++ = '"';
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break;
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}
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}
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/* Operator not found. */
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if (operators[k][0] == NULL)
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goto unknown;
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}
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else
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{
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/* Not a GNAT encoding. */
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goto unknown;
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}
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/* The name can be directly followed by some uppercase letters. */
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if (p[0] == 'T' && p[1] == 'K')
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{
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/* Task stuff. */
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if (p[2] == 'B' && p[3] == 0)
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{
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/* Subprogram for task body. */
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break;
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}
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else if (p[2] == '_' && p[3] == '_')
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{
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/* Inner declarations in a task. */
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p += 4;
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*d++ = '.';
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continue;
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}
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else
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goto unknown;
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}
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if (p[0] == 'E' && p[1] == 0)
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{
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/* Exception name. */
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goto unknown;
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}
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if ((p[0] == 'P' || p[0] == 'N') && p[1] == 0)
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{
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/* Protected type subprogram. */
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break;
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}
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if ((*p == 'N' || *p == 'S') && p[1] == 0)
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{
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/* Enumerated type name table. */
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goto unknown;
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}
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if (p[0] == 'X')
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{
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/* Body nested. */
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p++;
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while (p[0] == 'n' || p[0] == 'b')
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p++;
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}
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if (p[0] == 'S' && p[1] != 0 && (p[2] == '_' || p[2] == 0))
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{
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/* Stream operations. */
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const char *name;
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switch (p[1])
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{
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case 'R':
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name = "'Read";
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break;
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case 'W':
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name = "'Write";
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break;
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case 'I':
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name = "'Input";
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break;
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case 'O':
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name = "'Output";
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break;
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default:
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goto unknown;
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}
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p += 2;
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strcpy (d, name);
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d += strlen (name);
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}
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else if (p[0] == 'D')
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{
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/* Controlled type operation. */
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const char *name;
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switch (p[1])
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{
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case 'F':
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name = ".Finalize";
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break;
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case 'A':
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name = ".Adjust";
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break;
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default:
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goto unknown;
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}
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strcpy (d, name);
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d += strlen (name);
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break;
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}
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if (p[0] == '_')
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{
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/* Separator. */
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if (p[1] == '_')
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{
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/* Standard separator. Handled first. */
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p += 2;
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if (ISDIGIT (*p))
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{
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/* Overloading number. */
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do
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p++;
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while (ISDIGIT (*p) || (p[0] == '_' && ISDIGIT (p[1])));
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if (*p == 'X')
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{
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p++;
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while (p[0] == 'n' || p[0] == 'b')
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p++;
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}
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}
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else if (p[0] == '_' && p[1] != '_')
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{
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/* Special names. */
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static const char * const special[][2] = {
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{ "_elabb", "'Elab_Body" },
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{ "_elabs", "'Elab_Spec" },
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{ "_size", "'Size" },
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{ "_alignment", "'Alignment" },
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{ "_assign", ".\":=\"" },
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{ NULL, NULL }
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};
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int k;
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for (k = 0; special[k][0] != NULL; k++)
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{
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size_t slen = strlen (special[k][0]);
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if (strncmp (p, special[k][0], slen) == 0)
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{
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p += slen;
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slen = strlen (special[k][1]);
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memcpy (d, special[k][1], slen);
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d += slen;
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break;
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}
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}
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if (special[k][0] != NULL)
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break;
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else
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goto unknown;
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}
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else
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{
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*d++ = '.';
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continue;
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}
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}
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else if (p[1] == 'B' || p[1] == 'E')
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{
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/* Entry Body or barrier Evaluation. */
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p += 2;
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while (ISDIGIT (*p))
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p++;
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if (p[0] == 's' && p[1] == 0)
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break;
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else
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goto unknown;
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}
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else
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goto unknown;
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}
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if (p[0] == '.' && ISDIGIT (p[1]))
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{
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/* Nested subprogram. */
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p += 2;
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while (ISDIGIT (*p))
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p++;
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}
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if (*p == 0)
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{
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/* End of mangled name. */
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break;
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}
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else
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goto unknown;
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}
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*d = 0;
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return demangled;
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unknown:
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XDELETEVEC (demangled);
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len0 = strlen (mangled);
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demangled = XNEWVEC (char, len0 + 3);
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if (mangled[0] == '<')
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strcpy (demangled, mangled);
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else
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sprintf (demangled, "<%s>", mangled);
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return demangled;
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}
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