Summary:
The MSVC ABI appears to mangle the lexical scope into the names of
statics. Specifically, a counter is incremented whenever a scope is
entered where things can be declared in such a way that an ambiguity can
arise. For example, a class scope inside of a class scope doesn't do
anything interesting because the nested class cannot collide with
another nested class.
There are problems with this scheme:
- It is unreliable. The counter is only incremented when a previously
never encountered scope is entered. There are cases where this will
cause ambiguity amongst declarations that have the same name where one
was introduced in a deep scope while the other was introduced right
after in the previous lexical scope.
- It is wasteful. Statements like: {{{{{{{ static int foo = a; }}}}}}}
will make the mangling of "foo" larger than it need be because the
scope counter has been incremented many times.
Because of these problems, and practical implementation concerns. We
choose not to implement this scheme if the local static or local type
isn't visible. The mangling of these declarations will look very
similar but the numbering will make far more sense, this scheme is
lifted from the Itanium ABI implementation.
Reviewers: rsmith, doug.gregor, rnk, eli.friedman, cdavis5x
Reviewed By: rnk
CC: cfe-commits
Differential Revision: http://llvm-reviews.chandlerc.com/D2953
llvm-svn: 202951
Per more discussion, 'objc_protocol_requires_explicit_implementation' is
refinement that it mainly adds that requirement that a protocol must be
explicitly satisfied at the moment the first class in the class hierarchy
conforms to it. Any subclasses that also conform to that protocol,
either directly or via conforming to a protocol that inherits that protocol,
do not need to re-implement that protocol.
Doing this requires first doing a pass on the super class hierarchy,
gathering the set of protocols conformed to by the super classes,
and then culling those out when determining conformance. This
two-pass algorithm could be generalized for all protocol checking,
and could possibly be a performance win in some cases. For now
we restrict this change to protocols with this attribute to isolate
the change in logic (especially as the design continues to evolve).
This change needs to be adjusted for properties as well; this
only impacts methods right now.
llvm-svn: 202948
Patchpoints already did this. Doing it for stackmaps is a convenience
for the runtime in the event that it needs to scratch register to
patch or perform a runtime call thunk.
Unlike patchpoints, we just assume the AnyRegCC calling
convention. This is the only language and target independent calling
convention specific to stackmaps so makes sense. Although the calling
convention is not currently used to select the scratch registers.
llvm-svn: 202943
selection dag (PR19012)
In X86SelectionDagInfo::EmitTargetCodeForMemcpy we check with MachineFrameInfo
to make sure that ESI isn't used as a base pointer register before we choose to
emit rep movs (which clobbers esi).
The problem is that MachineFrameInfo wouldn't know about dynamic allocas or
inline asm that clobbers the stack pointer until SelectionDAGBuilder has
encountered them.
This patch fixes the problem by checking for such things when building the
FunctionLoweringInfo.
Differential Revision: http://llvm-reviews.chandlerc.com/D2954
llvm-svn: 202930
The correct name of the type in LLVM assembly is "x86_mmx". Also remove
the reST label "t_x86mmx" because it was unused anyway.
Patch by Manuel Jacob!
Differential Revision: http://llvm-reviews.chandlerc.com/D2955
llvm-svn: 202929
itself and teach it to convert between the non-const and const variants.
De-templatetize its usage in APIs to just use the const variant which
always works for those use cases. Also, rename its implementation to
reflect that it is an iterator over *users* not over *uses*.
This is a step toward providing both iterator and range support for
walking the *uses* distinct from the *users*. In a subsequent patch this
will get renamed to make it clear that this is an adaptor over the
fundamental use iterator.
llvm-svn: 202923
using a full uint16_t with the flag value... which happens to be
0 or 1. Update the class for bool values and rename functions slightly.
llvm-svn: 202921
Looks like llvm-readobj is the only customer of this code, and apparently
there's no test to cover this function. I'll write it after finishing
plumbing from llvm-objdump to there.
llvm-svn: 202915
Some unreachable code is only "sometimes unreachable" because it
is guarded by a configuration value that is determined at compile
time and is always constant. Sometimes those represent real bugs,
but often they do not. This patch causes the reachability analysis
to cover such branches even if they are technically unreachable
in the CFG itself. There are some conservative heuristics at
play here to determine a "configuration value"; these are intended
to be refined over time.
llvm-svn: 202912
Summary:
Our usual definition of max_align_t wouldn't match up with MSVC if it
was used in a template argument.
Reviewers: chandlerc, rsmith, rnk
Reviewed By: chandlerc
CC: cfe-commits
Differential Revision: http://llvm-reviews.chandlerc.com/D2924
llvm-svn: 202911
Currently this code is duplicated across visitSHL, visitSRA and visitSRL. The
plan is to add rotates as clients to this new function.
There is no functional change intended here.
llvm-svn: 202908
ProcessGDBRemote::GetAuxvData obtains the auxv from a remote gdbserver (via a binary-data packet), and returns the data as a DataBufferSP.
The patch includes a small fix to GDBRemoteCommunicationClient::SendPacketsAndConcatenateResponses() to support binary file format packet returns (by not assuming each binary packet is a null-terminated string when concatenating them).
llvm-svn: 202907
Andrew MacPherson