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The DWARF data for Swift code has a top-level DW_TAG_module DIE as the child of the DW_TAG_compile_unit DIE and the parent of the DW_TAG_subprogram DIEs that dump_syms uses to locate functions. dump_syms needs to process DW_TAG_module DIEs as introducing nested scopes to make it work with Swift. This also reworks demangling to be language-specific, so that the C++ demangler isn't invoked when processing Swift code. The DWARF data for Swift code presents its mangled names in the same form as used for C++ (DW_AT_MIPS_linkage_name or DW_AT_linkage_name) but the mangling is Swift-specific (beginning with _T instead of _Z). There is no programmatic interface to a Swift name demangler as an analogue to C++'s __cxa_demangle(), so mangled Swift names are exposed as-is. Xcode's "xcrun swift-demangle" can be used to post-process these mangled Swift names on macOS. Support for mangled names presented in a DW_AT_linkage_name attribute, as used by DWARF 4, is added. This supersedes the earlier use of DW_AT_MIPS_linkage_name. BUG=google-breakpad:702,google-breakpad:715 R=ted.mielczarek@gmail.com Review URL: https://codereview.chromium.org/2147523005 .
105 lines
4.2 KiB
C++
105 lines
4.2 KiB
C++
// -*- mode: c++ -*-
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// Copyright (c) 2010 Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
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// language.h: Define google_breakpad::Language. Instances of
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// subclasses of this class provide language-appropriate operations
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// for the Breakpad symbol dumper.
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#ifndef COMMON_LINUX_LANGUAGE_H__
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#define COMMON_LINUX_LANGUAGE_H__
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#include <string>
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#include "common/using_std_string.h"
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namespace google_breakpad {
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// An abstract base class for language-specific operations. We choose
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// an instance of a subclass of this when we find the CU's language.
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// This class's definitions are appropriate for CUs with no specified
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// language.
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class Language {
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public:
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// A base class destructor should be either public and virtual,
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// or protected and nonvirtual.
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virtual ~Language() {}
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// Return true if this language has functions to which we can assign
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// line numbers. (Debugging info for assembly language, for example,
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// can have source location information, but does not have functions
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// recorded using DW_TAG_subprogram DIEs.)
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virtual bool HasFunctions() const { return true; }
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// Construct a fully-qualified, language-appropriate form of NAME,
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// given that PARENT_NAME is the name of the construct enclosing
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// NAME. If PARENT_NAME is the empty string, then NAME is a
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// top-level name.
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//
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// This API sort of assumes that a fully-qualified name is always
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// some simple textual composition of the unqualified name and its
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// parent's name, and that we don't need to know anything else about
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// the parent or the child (say, their DIEs' tags) to do the job.
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// This is true for the languages we support at the moment, and
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// keeps things concrete. Perhaps a more refined operation would
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// take into account the parent and child DIE types, allow languages
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// to use their own data type for complex parent names, etc. But if
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// C++ doesn't need all that, who would?
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virtual string MakeQualifiedName (const string &parent_name,
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const string &name) const = 0;
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enum DemangleResult {
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// Demangling was not performed because it’s not appropriate to attempt.
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kDontDemangle = -1,
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kDemangleSuccess,
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kDemangleFailure,
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};
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// Wraps abi::__cxa_demangle() or similar for languages where appropriate.
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virtual DemangleResult DemangleName(const string& mangled,
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std::string* demangled) const {
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demangled->clear();
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return kDontDemangle;
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}
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// Instances for specific languages.
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static const Language * const CPlusPlus,
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* const Java,
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* const Swift,
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* const Assembler;
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};
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} // namespace google_breakpad
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#endif // COMMON_LINUX_LANGUAGE_H__
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