Revert "Address http://bugs.llvm.org/pr30994 so that a non-friend can properly replace a friend, and a visible friend can properly replace an invisible friend but not vice verse, and definitions are not replaced. This fixes the two FIXME in SemaTemplate/friend-template.cpp."

This reverts commit r300443. Breaks compiling libc++ with modules in
some configurations.

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Differential Revision: https://reviews.llvm.org/D32133


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Differential Revision: https://reviews.llvm.org/D31717


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Use default ref capture to simplify local lambdas, use a template to avoid std::function overhead, other cleanup

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Also, simplify code by calling MakeNaturalAlignAddrLValue.

This is a follow-up to r300396.

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Address http://bugs.llvm.org/pr30994 so that a non-friend can properly replace a friend, and a visible friend can properly replace an invisible friend but not vice verse, and definitions are not replaced. This fixes the two FIXME in SemaTemplate/friend-template.cpp.

The code implements Richard Smith suggestion in comment 3 of the PR.

reviewer: Vassil Vassilev

Differential Revision: https://reviews.llvm.org/D31540



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This diff registers isConstexpr matcher.

Test plan:
make check-all
check that "match varDecl(isConstexpr())" 
works in clang-query

Differential revision: https://reviews.llvm.org/D32112


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Revert r300420 - [coroutines] Fix building of new/delete expressions when get_return_object_on_allocation_failure() is present

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[coroutines] Fix building of new/delete expressions when get_return_object_on_allocation_failure() is present.

Summary:
This patch implements [dcl.fct.def.coroutine]p8:
> The unqualified-id get_return_object_on_allocation_failure is looked up in the scope of
> class P by class member access lookup (3.4.5). If a declaration is found, ..., and if a 
> global allocation function is selected, the ::operator new(size_t, nothrow_t) form shall be used.
> [...]
> The allocation function used in this case must have a non-throwing noexcept-specification.

Reviewers: GorNishanov, rsmith, majnemer, aaron.ballman

Reviewed By: GorNishanov

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D31562

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Patch by Dave Lee.

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available.

Original patch by Douglas Gregor with minor modifications.

This recommits r300389, which broke bots because there have been API
changes since the original patch was written.

rdar://problem/20689633

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with disabling it as well as disabling all vsx specific features when
turning off altivec.

Fixes PR32663.

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If expensive checks are enabled, safe mode of libstdc++ is enabled too.
In this mode the library uses more complex data that allow additional
checks, for instance, a container may keep list of iterators that points
to it. If a code crashes it can leave these complex library objects in
inconsistent state. It occurs in a few tests that check error recovery
if compiler crashes. These test hang in expensive check mode, as the
library tries to synchronize access to the iterators pointing to some
container, but corresponding mutex remains locked after the crash.

This fix marks these tests as unsupported if clang is built with
libstdc++ safe mode enabled.

Differential Revision: https://reviews.llvm.org/D31126


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This reverts commit r300389. There were mistakes in the changes I made
to CodeGen.

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available.

Original patch by Douglas Gregor with minor modifications.

rdar://problem/20689633

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The modules side of r299226, which serializes #pragma pack state,
doesn't work well.

The main purpose was to make -include and -include-pch match semantics
(the PCH side).  We also started serializing #pragma pack in PCMs, in
the hopes of making modules and non-modules builds more consistent.  But
consider:

    $ cat a.h
    $ cat b.h
    #pragma pack(push, 2)
    $ cat module.modulemap
    module M {
        module a { header "a.h" }
        module b { header "b.h" }
    }
    $ cat t.cpp
    #include "a.h"
    #pragma pack(show)

As of r299226, the #pragma pack(show) gives "2", even though we've only
included "a.h".

- With -fmodules-local-submodule-visibility, this is clearly wrong.  We
  should get the default state (8 on x86_64).

- Without -fmodules-local-submodule-visibility, this kind of matches how
  other things work (as if include-the-whole-module), but it's still
  really terrible, and it doesn't actually make modules and non-modules
  builds more consistent.

This commit disables the serialization for modules, essentially a
partial revert of r299226.

Going forward:

 1. Having this #pragma pack stuff escape is terrible design (or, more
    often, a horrible bug).  We should prioritize adding warnings (maybe
    -Werror by default?).

 2. If we eventually reintroduce this for modules, it should only apply
    to -fmodules-local-submodule-visibility, and it should be tracked on
    a per-submodule basis.

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If a pointer is 1-byte aligned, there's no use in checking its
alignment. Somewhat surprisingly, ubsan can spend a significant amount
of time doing just that!

This loosely depends on D30283.

Testing: check-clang, check-ubsan, and a stage2 ubsan build.

Differential Revision: https://reviews.llvm.org/D30285

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This patch teaches ubsan to insert an alignment check for the 'this'
pointer at the start of each method/lambda. This allows clang to emit
significantly fewer alignment checks overall, because if 'this' is
aligned, so are its fields.

This is essentially the same thing r295515 does, but for the alignment
check instead of the null check. One difference is that we keep the
alignment checks on member expressions where the base is a DeclRefExpr.
There's an opportunity to diagnose unaligned accesses in this situation
(as pointed out by Eli, see PR32630).

Testing: check-clang, check-ubsan, and a stage2 ubsan build.

Along with the patch from D30285, this roughly halves the amount of
alignment checks we emit when compiling X86FastISel.cpp. Here are the
numbers from patched/unpatched clangs based on r298160.

  ------------------------------------------
  | Setup          | # of alignment checks |
  ------------------------------------------
  | unpatched, -O0 |                 24326 |
  | patched, -O0   |                 12717 | (-47.7%)
  ------------------------------------------

Differential Revision: https://reviews.llvm.org/D30283

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CodeGenFunction::EmitObjCForCollectionStmt currently emits lifetime markers for the loop variable in an inconsistent way:  lifetime.start is emitted before the loop is entered, but lifetime.end is emitted inside the loop. AddressSanitizer uses these markers to track out-of-scope accesses to local variables, and we get false positives in Obj-C foreach loops (in the 2nd iteration of the loop). This patch keeps the loop variable alive for the whole loop by extending ForScope and registering the cleanup function inside EmitAutoVarAlloca.

Differential Revision: https://reviews.llvm.org/D32029



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The config-*triple* file handling isn't tolerant of 
leading/trailing whitespace, making it not terribly 
obvious when a single extraneous tab/space/etc will 
cause the override to be ignored. This patch simply 
trims the lines to ensure that it is tolerant of 
whitespace.


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MOVNTDQA non-temporal aligned vector loads can be correctly represented using generic builtin loads, allowing us to remove the existing x86 intrinsics.

LLVM companion patch: D31767.

Differential Revision: https://reviews.llvm.org/D31766

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Patch by Yuka Takahashi (D31591)!


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Differential Revision: https://reviews.llvm.org/D31482


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Printing out stack traces along with UBSan diagnostics is unsupported on
Darwin. That's because it isn't possible to use the fast unwinder or the
slow unwinder.

Apparently, it's inappropriate to use the fast unwinder for UBSan
issues. I'm not exactly sure why (see the comment in ubsan_diag.cc).
Forcing use of the fast unwinder produces decent results, AFAICT.

Darwin also does not appear to have a slow unwinder suitable for use
with the sanitizers. Apparently that's because of PR20800 [1][2]. But
that bug has been fixed. I'm not sure if there is anything preventing
use of the slow unwinder now.

Currently, passing UBSAN_OPTIONS=print_stacktrace=1 does nothing on
Darwin. This isn't good, but it might be a while before we can fix the
situation, so we should at least document it.

[1] https://github.com/google/sanitizers/issues/137
"We can't use the slow unwinder on OSX now, because Clang produces
incorrect unwind info for the ASan runtime functions on OSX
(http://llvm.org/PR20800)."

[2] https://bugs.llvm.org/show_bug.cgi?id=20800
Bug 20800 - Invalid compact unwind info generated for a function without
frame pointers on OSX

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CodeGenFunction::EmitObjCForCollectionStmt currently emits lifetime markers for the loop variable in an inconsistent way:  lifetime.start is emitted before the loop is entered, but lifetime.end is emitted inside the loop.  AddressSanitizer uses these markers to track out-of-scope accesses to local variables, and we get false positives in Obj-C foreach loops (in the 2nd iteration of the loop). The markers of the loop variable need to be either both inside the loop (so that we poison and unpoison the variable in each iteration), or both outside. This patch implements the "both inside" approach.

Differential Revision: https://reviews.llvm.org/D32029



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PR/32584

Differential Revision: https://reviews.llvm.org/D32023


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Add hasParamAttribute() and use it instead of hasAttribute(ArgNo+1,
Kind) everywhere.

The fact that the AttributeList index for an argument is ArgNo+1 should
be a hidden implementation detail.

NFC

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Patch by Jacob Young!


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Patch by Jacob Young!

Differential Revision: https://reviews.llvm.org/D27263


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