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Initial support for dumping DWARF corresponding to Swift code

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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 .
This commit is contained in:
Mark Mentovai 2016-09-23 14:22:42 -04:00
parent 138886803c
commit 7398ce15b7
6 changed files with 130 additions and 33 deletions
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16
src/common/language.h
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@ -77,9 +77,25 @@ class Language {
virtual string MakeQualifiedName (const string &parent_name,
const string &name) const = 0;
enum DemangleResult {
// Demangling was not performed because it’s not appropriate to attempt.
kDontDemangle = -1,
kDemangleSuccess,
kDemangleFailure,
};
// Wraps abi::__cxa_demangle() or similar for languages where appropriate.
virtual DemangleResult DemangleName(const string& mangled,
std::string* demangled) const {
demangled->clear();
return kDontDemangle;
}
// Instances for specific languages.
static const Language * const CPlusPlus,
* const Java,
* const Swift,
* const Assembler;
};