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| author | Adrian Prantl <aprantl@apple.com> | 2019-10-29 09:20:14 -0700 |
|---|---|---|
| committer | Adrian Prantl <aprantl@apple.com> | 2019-10-29 13:44:06 -0700 |
| commit | f919be336583349d883ba0dfdb3b2479a190b67c (patch) | |
| tree | 8abf8bb775e050414bcd735d6702bfeb00418637 /llvm/docs/SourceLevelDebugging.rst | |
| parent | 3260fa2cb09b78ad55e91d95a522d9dc455575f0 (diff) | |
[DWARF5] Added support for deleted C++ special member functions.
This patch adds support for deleted C++ special member functions in
clang and llvm. Also added Defaulted member encodings for future
support for defaulted member functions.
Patch by Sourabh Singh Tomar!
Differential Revision: https://reviews.llvm.org/D69215
Diffstat (limited to 'llvm/docs/SourceLevelDebugging.rst')
| -rw-r--r-- | llvm/docs/SourceLevelDebugging.rst | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/llvm/docs/SourceLevelDebugging.rst b/llvm/docs/SourceLevelDebugging.rst index a887810db4d8..978184743314 100644 --- a/llvm/docs/SourceLevelDebugging.rst +++ b/llvm/docs/SourceLevelDebugging.rst @@ -989,6 +989,39 @@ a C/C++ front-end would generate the following descriptors: ... } +C++ specific debug information +============================== + +C++ special member functions information +---------------------------------------- + +DWARF v5 introduces attributes defined to enhance debugging information of C++ programs. LLVM can generate (or omit) these appropriate DWARF attributes. In C++ a special member function Ctors, Dtors, Copy/Move Ctors, assignment operators can be declared with C++11 keyword deleted. This is represented in LLVM using spFlags value DISPFlagDeleted. + +Given a class declaration with copy constructor declared as deleted: + +.. code-block:: c + + class foo { + public: + foo(const foo&) = deleted; + }; + +A C++ frontend would generate follwing: + +.. code-block:: text + + !17 = !DISubprogram(name: "foo", scope: !11, file: !1, line: 5, type: !18, scopeLine: 5, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagDeleted) + +and this will produce an additional DWARF attibute as: + +.. code-block:: text + + DW_TAG_subprogram [7] * + DW_AT_name [DW_FORM_strx1] (indexed (00000006) string = "foo") + DW_AT_decl_line [DW_FORM_data1] (5) + ... + DW_AT_deleted [DW_FORM_flag_present] (true) + Fortran specific debug information ================================== |