maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Update the MSVC Compatibility document 

It hasn't been updated to reflect the progress we've made.  We've fuzz
tested VFTables, VBTables, layout, and RTTI data.  We support lambdas
that are compatible with their scheme.

llvm-svn: 212193
This commit is contained in:
David Majnemer 2014-07-02 17:26:04 +00:00
parent a746e8e58a
commit fe828adf19
1 changed files with 12 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
clang/docs/MSVCCompatibility.rst
View File

@ -43,14 +43,14 @@ ABI features
The status of major ABI-impacting C++ features:
* Record layout: :good:`Mostly complete`. We've tested this with a fuzzer, and
most of the remaining failures involve ``#pragma pack``,
``__declspec(align(N))``, or other pragmas.
* Record layout: :good:`Complete`. We've tested this with a fuzzer and have
fixed all known bugs.
* Class inheritance: :good:`Mostly complete`. This covers all of the standard
OO features you would expect: virtual method inheritance, multiple
inheritance, and virtual inheritance. Every so often we uncover a bug where
our tables are incompatible, but this is pretty well in hand.
our tables are incompatible, but this is pretty well in hand. This feature
has also been fuzz tested.
* Name mangling: :good:`Ongoing`. Every new C++ feature generally needs its own
mangling. For example, member pointer template arguments have an interesting
@ -78,23 +78,21 @@ The status of major ABI-impacting C++ features:
enabling stack traces in all modern Windows debuggers. Clang does not emit
any type info or description of variable layout.
* `RTTI`_: :none:`Unstarted`. See the bug for a discussion of what needs to
happen first.
.. _RTTI: http://llvm.org/PR18951
* `RTTI`_: :good:`Complete`. Generation of RTTI data structures has been
finished, along with support for the ``/GR`` flag.
* Exceptions and SEH: :none:`Unstarted`. Clang can parse both constructs, but
does not know how to emit compatible handlers. This depends on RTTI.
* Thread-safe initialization of local statics: :none:`Unstarted`. We are ABI
compatible with MSVC 2012, which does not support thread-safe local statics.
MSVC 2013 changed the ABI to make initialization of local statics thread safe,
compatible with MSVC 2013, which does not support thread-safe local statics.
MSVC "14" changed the ABI to make initialization of local statics thread safe,
and we have not yet implemented this.
* Lambdas in ABI boundaries: :none:`Infeasible`. It is unlikely that we will
ever be fully ABI compatible with lambdas declared in inline functions due to
what appears to be a hash code in the name mangling. Lambdas that are not
externally visible should work fine.
* Lambdas: :none:`Mostly complete`. Clang is compatible with Microsoft's
implementation of lambdas except for providing overloads for conversion to
function pointer for different calling conventions. However, Microsoft's
extension is non-conforming.
Template instantiation and name lookup
======================================