Summary:
This attribute will allow users to opt specific functions out of
speculative load hardening. This compliments the Clang attribute
named speculative_load_hardening. When this attribute or the attribute
speculative_load_hardening is used in combination with the flags
-mno-speculative-load-hardening or -mspeculative-load-hardening,
the function level attribute will override the default during LLVM IR
generation. For example, in the case, where the flag opposes the
function attribute, the function attribute will take precendence.
The sticky inlining behavior of the speculative_load_hardening attribute
may cause a function with the no_speculative_load_hardening attribute
to be tagged with the speculative_load_hardening tag in
subsequent compiler phases which is desired behavior since the
speculative_load_hardening LLVM attribute is designed to be maximally
conservative.
If both attributes are specified for a function, then an error will be
thrown.
Erich Keane [Fri, 18 Jan 2019 13:58:10 +0000 (13:58 +0000)]
Fix test failure from r351495
The test has problems due to some platforms having a different type for
ptrdiff_t, so the error message is different. The error message doesn't
matter to the test for anything other than an incompatible intger to
pointer conversion, so this patch removes the integral type from the
expected message.
Artem Dergachev [Fri, 18 Jan 2019 00:08:56 +0000 (00:08 +0000)]
[analyzer] Make sure base-region and its sub-regions are either all alive or all dead.
SymbolReaper now realizes that our liveness analysis isn't sharp enough
to discriminate between liveness of, say, variables and their fields.
Surprisingly, this didn't quite work before: having a variable live only
through Environment (eg., calling a C++ method on a local variable
as the last action ever performed on that variable) would not keep the
region value symbol of a field of that variable alive.
It would have been broken in the opposite direction as well, but both
Environment and RegionStore use the scanReachableSymbols mechanism for finding
live symbols regions within their values, and due to that they accidentally
end up marking the whole chain of super-regions as live when at least one
sub-region is known to be live.
It is now a direct responsibility of SymbolReaper to maintain this invariant,
and a unit test was added in order to make sure it stays that way.
Erich Keane [Thu, 17 Jan 2019 23:11:15 +0000 (23:11 +0000)]
Make integral-o-pointer conversions in SFINAE illegal.
As reported in PR40362, allowing the conversion from an integral to a
pointer type (despite being illegal in the C++ standard) will cause
surprsing results when testing for certain behaviors in SFINAE. This
patch converts the error to a SFINAE Error and adds a test to ensure
that it is still a warning in non-SFINAE but an error in it.
Richard Smith [Thu, 17 Jan 2019 22:05:50 +0000 (22:05 +0000)]
Fix cleanup registration for lambda captures.
Lambda captures should be destroyed if an exception is thrown only if
the construction of the complete lambda-expression has not completed.
(If the lambda-expression has been fully constructed, any exception will
invoke its destructor, which will destroy the captures.)
This is directly modeled after how we handle the equivalent situation in
InitListExprs.
Note that EmitLambdaLValue was unreachable because in C++11 onwards the
frontend never creates the awkward situation where a prvalue expression
(such as a lambda) is used in an lvalue context (such as the left-hand
side of a class member access).
Eric Fiselier [Thu, 17 Jan 2019 21:44:24 +0000 (21:44 +0000)]
Add -Wctad-maybe-unsupported to diagnose CTAD on types with no user defined deduction guides.
Summary:
Some style guides want to allow using CTAD only on types that "opt-in"; i.e. on types that are designed to support it and not just types that *happen* to work with it.
This patch implements the `-Wctad-maybe-unsupported` warning, which is off by default, which warns when CTAD is used on a type that does not define any deduction guides.
The following pattern can be used to suppress the warning in cases where the type intentionally doesn't define any deduction guides:
```
struct allow_ctad_t;
template <class T>
struct TestSuppression {
TestSuppression(T) {}
};
TestSuppression(allow_ctad_t)->TestSuppression<void>; // guides with incomplete parameter types are never considered.
```
Erik Pilkington [Thu, 17 Jan 2019 18:18:53 +0000 (18:18 +0000)]
[CodeGenObjC] Use a constant value for non-fragile ivar offsets when possible
If a class inherits from NSObject and has an implementation, then we
can assume that ivar offsets won't need to be updated by the runtime.
This allows us to index into the object using a constant value and
avoid loading from the ivar offset variable.
This patch was adapted from one written by Pete Cooper.
Alex Lorenz [Thu, 17 Jan 2019 18:12:45 +0000 (18:12 +0000)]
[ObjC] Follow-up r350768 and allow the use of unavailable methods that are
declared in a parent class from within the @implementation context
This commit extends r350768 and allows the use of methods marked as unavailable
that are declared in a parent class/category from within the @implementation of
the class where the method is marked as unavailable.
This allows users to call init that's marked as unavailable even if they don't
define it.
Vlad Tsyrklevich [Thu, 17 Jan 2019 17:53:45 +0000 (17:53 +0000)]
TLS: Respect visibility for thread_local variables on Darwin (PR40327)
Summary:
Teach clang to mark thread wrappers for thread_local variables with
hidden visibility when the original variable is marked with hidden
visibility. This is necessary on Darwin which exposes the thread wrapper
instead of the thread variable. The thread wrapper would previously
always be created with default visibility unless it had
linkonce*/weak_odr linkage.
CodeGen: Cast llvm.flt.rounds result to match __builtin_flt_rounds
llvm.flt.rounds returns an i32, but the builtin expects an integer.
On targets where integers are not 32-bits clang tries to bitcast the result, causing an assertion failure.
Richard Smith [Wed, 16 Jan 2019 22:01:39 +0000 (22:01 +0000)]
PR40329: [adl] Fix determination of associated classes when searching a
member enum and then its enclosing class.
There are situations where ADL will collect a class but not the complete
set of associated classes / namespaces of that class. When that
happened, and we later tried to collect those associated classes /
namespaces, we would previously short-circuit the lookup and not find
them. Eg, for:
struct A : B { enum E; };
if we first looked for associated classes/namespaces of A::E, we'd find
only A. But if we then tried to also collect associated
classes/namespaces of A (which should include the base class B), we
would not add B because we had already visited A.
This also fixes a minor issue where we would fail to collect associated
classes from an overloaded class member access expression naming a
static member function.
Leonard Chan [Wed, 16 Jan 2019 19:53:50 +0000 (19:53 +0000)]
[Fixed Point Arithmetic] Fixed Point Subtraction
This patch covers subtraction between fixed point types and other fixed point
types or integers, using the conversion rules described in 4.1.4 of N1169.
Leonard Chan [Wed, 16 Jan 2019 18:13:59 +0000 (18:13 +0000)]
[Fixed Point Arithmetic] Fixed Point Addition
This patch covers addition between fixed point types and other fixed point
types or integers, using the conversion rules described in 4.1.4 of N1169.
Usual arithmetic rules do not apply to binary operations when one of the
operands is a fixed point type, and the result of the operation must be
calculated with the full precision of the operands, so we should not perform
any casting to a common type.
This patch does not include constant expression evaluation for addition of
fixed point types. That will be addressed in another patch since I think this
one is already big enough.
Jeremy Morse [Wed, 16 Jan 2019 17:41:29 +0000 (17:41 +0000)]
Add a REQUIRES: darwin line for a mac test.
This test, apparently for macs, fails on Windows as lit can't emulate
the shell subprocess $(which...) correctly. Some other netbsd and linux
buildbots also fail here. Limit to macs as a temporary workaround.
* Accept as an argument constants in range 0..63 (aligned with TI headers and linker scripts provided with TI GCC toolchain).
* Emit function attribute 'interrupt'='xx' instead of aliases (used in the backend to create a section for particular interrupt vector).
* Add more diagnostics.
Ilya Biryukov [Wed, 16 Jan 2019 13:18:59 +0000 (13:18 +0000)]
Set '-target' flag in the test checking the MacOS include dir
To fix a buildbot failure on PS4, see
http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-ubuntu-fast/builds/42251
The test was added in r351222 and aims to check only a particular
Mac configuration. However it relied on the default compiler target
by default, therefore unintentionally failing on PS4.
Pavel Labath [Wed, 16 Jan 2019 09:55:32 +0000 (09:55 +0000)]
[Support] Remove error return value from one overload of fs::make_absolute
Summary:
The version of make_absolute which accepted a specific directory to use
as the "base" for the computation could never fail, even though it
returned a std::error_code. The reason for that seems to be historical
-- the CWD flavour (which can fail due to failure to retrieve CWD) was
there first, and the new version was implemented by extending that.
This removes the error return value from the non-CWD overload and
reimplements the CWD version on top of that. This enables us to remove
some dead code where people were pessimistically trying to handle the
errors returned from this function.
Philip Pfaffe [Wed, 16 Jan 2019 09:28:01 +0000 (09:28 +0000)]
[NewPM][TSan] Reiterate the TSan port
Summary:
Second iteration of D56433 which got reverted in rL350719. The problem
in the previous version was that we dropped the thunk calling the tsan init
function. The new version keeps the thunk which should appease dyld, but is not
actually OK wrt. the current semantics of function passes. Hence, add a
helper to insert the functions only on the first time. The helper
allows hooking into the insertion to be able to append them to the
global ctors list.
Craig Topper [Wed, 16 Jan 2019 07:17:14 +0000 (07:17 +0000)]
[X86] Correct the type string for __builtin_ia32_gathersiv16sf to make the indices an integer type not an FP type.
The element count and width remain the same. This went unnoticed because default conversion from builtin to intrinsic will generate a bitcast if the types don't match.
Eric Fiselier [Wed, 16 Jan 2019 02:34:36 +0000 (02:34 +0000)]
[SemaCXX] Unconfuse Clang when std::align_val_t is unscoped in C++03
When -faligned-allocation is specified in C++03 libc++ defines
std::align_val_t as an unscoped enumeration type (because Clang didn't
provide scoped enumerations as an extension until 8.0).
Unfortunately Clang confuses the `align_val_t` overloads of delete with
the sized deallocation overloads which aren't enabled. This caused Clang
to call the aligned deallocation function as if it were the sized
deallocation overload.
Reid Kleckner [Tue, 15 Jan 2019 21:24:55 +0000 (21:24 +0000)]
[clang-cl] Alias /Zc:alignedNew[-] to -f[no-]aligned-allocation
Implements PR40180.
clang-cl has one minor behavior difference with cl with this change.
Clang allows the user to enable the C++17 feature of aligned allocation
without enabling all of C++17, but MSVC will not call the aligned
allocation overloads unless -std:c++17 is passed. While our behavior is
technically incompatible, it would require making driver mode specific
changes to match MSVC precisely, and clang's behavior is useful because
it allows people to experiment with new C++17 features individually.
Therefore, I plan to leave it as is.
Craig Topper [Tue, 15 Jan 2019 19:58:36 +0000 (19:58 +0000)]
[Nios2] Remove Nios2 backend
As mentioned here http://lists.llvm.org/pipermail/llvm-dev/2019-January/129121.html This backend is incomplete and has not been maintained in several months.
Haojian Wu [Tue, 15 Jan 2019 19:05:50 +0000 (19:05 +0000)]
[Tooling] Make clang-tool find libc++ dir on mac when running on a file without compilation database.
Summary:
This is a regression of r348365.
When clang-tools run on a file without a complation database (`clang-check /tmp/t.cc`),
we will use fixed compilation database as a fallback. However the actual compiler
path in the fallback complation command is just `clang-tool` which is
insufficient to detect the libc++ dir.
Erich Keane [Tue, 15 Jan 2019 17:51:09 +0000 (17:51 +0000)]
Fix cpu-dispatch MV regression caused by r347812
r347812 permitted forward declarations for cpu-dispatch functions, which
are occassionally useful as exposition in header files. However, this inadvertently
permitted this function to become multiversioned after a usage. This
patch ensures that the "CausesMV" checks are still run in the
forward-declaration case.
The BoundNodesTreeBuilder class is used both directly and indirectly as a local
variable in matchesAncestorOfRecursively, memoizedMatchesAncestorOfRecursively
and other functions that happen to be on long recursive call paths. By reducing
the inline storage size of the SmallVector we dramatically reduce the stack
requirements of ASTMatchers. Running clang-tidy with a large number of checks
enabled on a few arbitrarily chosen files show no performance regression.
Roman Lebedev [Tue, 15 Jan 2019 11:20:02 +0000 (11:20 +0000)]
[OpenCL] opencl-c.h: read_image*(): sampler-less, and image{1,2}d_array_t variants are OpenCL-1.2+, mark them as such
Summary:
Refer to [[ https://www.khronos.org/registry/OpenCL/specs/opencl-1.1.pdf#page=242 | `6.11.13.2 Built-in Image Functions` ]],
and [[ https://www.khronos.org/registry/OpenCL/specs/opencl-1.1.pdf#page=306 | `9.6.8 Image Read and Write Functions` ]] of the OpenCL 1.1 spec.
* There is no mention of `image1d_array_t` and `image2d_array_t` anywhere in the OpenCL 1.1 spec.
* All the `read_image{f,i,ui,h}()` functions, as of OpenCL 1.1 spec, have a second required parameter `sampler_t sampler`
Should have prevented the following regression:
https://redmine.darktable.org/issues/12493
Roman Lebedev [Tue, 15 Jan 2019 09:44:25 +0000 (09:44 +0000)]
[clang][UBSan] Sanitization for alignment assumptions.
Summary:
UB isn't nice. It's cool and powerful, but not nice.
Having a way to detect it is nice though.
[[ https://wg21.link/p1007r3 | P1007R3: std::assume_aligned ]] / http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1007r2.pdf says:
```
We propose to add this functionality via a library function instead of a core language attribute.
...
If the pointer passed in is not aligned to at least N bytes, calling assume_aligned results in undefined behaviour.
```
This differential teaches clang to sanitize all the various variants of this assume-aligned attribute.
Requires D54588 for LLVM IRBuilder changes.
The compiler-rt part is D54590.
This is a second commit, the original one was r351105,
which was mass-reverted in r351159 because 2 compiler-rt tests were failing.
Dan Gohman [Tue, 15 Jan 2019 06:58:16 +0000 (06:58 +0000)]
[WebAssembly] Support multilibs for wasm32 and add a wasm OS that uses it
This adds support for multilib paths for wasm32 targets, following
[Debian's Multiarch conventions], and also adds an experimental OS name in
order to test it.
Craig Topper [Tue, 15 Jan 2019 05:03:18 +0000 (05:03 +0000)]
[X86] Make _xgetbv/_xsetbv on non-windows platforms
Summary:
This patch attempts to redo what was tried in r278783, but was reverted.
These intrinsics should be available on non-windows platforms with "xsave" feature check. But on Windows platforms they shouldn't have feature check since that's how MSVC behaves.
To accomplish this I've added a MS builtin with no feature check. And a normal gcc builtin with a feature check. When _MSC_VER is not defined _xgetbv/_xsetbv will be macros pointing to the gcc builtin name.
I've moved the forward declarations from intrin.h to immintrin.h to match the MSDN documentation and used that as the header file for the MS builtin.
I'm not super happy with this implementation, and I'm open to suggestions for better ways to do it.
Petr Hosek [Tue, 15 Jan 2019 01:15:00 +0000 (01:15 +0000)]
[CMake][Fuchsia] Synchronize first and second stage builds
This reorders options between the first and second stage builds to make
them better lined up. The change also re-enables tests for first stage
which is useful e.g. for cross-compiling when we cannot run tests for
second stage directly (i.e. without emulation).
Roman Lebedev [Mon, 14 Jan 2019 19:09:27 +0000 (19:09 +0000)]
[clang][UBSan] Sanitization for alignment assumptions.
Summary:
UB isn't nice. It's cool and powerful, but not nice.
Having a way to detect it is nice though.
[[ https://wg21.link/p1007r3 | P1007R3: std::assume_aligned ]] / http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1007r2.pdf says:
```
We propose to add this functionality via a library function instead of a core language attribute.
...
If the pointer passed in is not aligned to at least N bytes, calling assume_aligned results in undefined behaviour.
```
This differential teaches clang to sanitize all the various variants of this assume-aligned attribute.
Requires D54588 for LLVM IRBuilder changes.
The compiler-rt part is D54590.
projects / clang / log