Reid Kleckner [Fri, 13 Jan 2017 17:18:19 +0000 (17:18 +0000)]
Use less byval on 32-bit Windows x86 for classes with bases
This comes up in V8, which has a Handle template class that wraps a
typed pointer, and is frequently passed by value. The pointer is stored
in the base, HandleBase. This change allows us to pass the struct as a
pointer instead of using byval. This avoids creating tons of temporary
allocas that we copy from during call lowering.
Eventually, it would be good to use FCAs here instead.
Richard Smith [Fri, 13 Jan 2017 02:22:01 +0000 (02:22 +0000)]
Implement DR1265 (wg21.link/cwg1265).
Diasllow a declaration using the 'auto' type specifier from using two different
meanings of it at once, or from declaring multiple functions with deduced
return types or introducing multiple trailing return types.
The standard does not technically disallow the multiple trailing return types
case if all the declarators declare variables (such as function pointers with
trailing return types), but we disallow that too, following the clear intent.
In the case where the template class itself is already `dllexport`, the
implicit instantiation will have already emitted all members. When we
check the explicit instantiation definition, the `Specialization` will
have inherited the `dllexport` attribute, so we'll attempt to emit all
members for a second time, which causes an assertion failure. Restrict
the exporting to when the `dllexport` attribute is newly introduced by
the explicit instantiation definition.
Richard Smith [Fri, 13 Jan 2017 00:57:54 +0000 (00:57 +0000)]
Update C++ status pages for Clang 4 branch:
* Update version number in DR tests from 4.0 to 4
* Teach make_cxx_dr_status script about version numbers that don't contain a
period.
* Update cxx_status.html and cxx_dr_status.html to list Clang 4 features as
"Clang 4" rather than "SVN"
Clang 4 features are still listed in yellow rather than green until release.
Dehao Chen [Fri, 13 Jan 2017 00:51:55 +0000 (00:51 +0000)]
Pass -fprofile-sample-use to lto backends.
Summary: LTO backend will not invoke SampleProfileLoader pass even if -fprofile-sample-use is specified. This patch passes the flag down so that pass manager can add the SampleProfileLoader pass correctly.
Anna Zaks [Fri, 13 Jan 2017 00:50:50 +0000 (00:50 +0000)]
[tsan] Do not report errors in __destroy_helper_block_
There is a synchronization point between the reference count of a block dropping to zero and it's destruction, which TSan does not observe. Do not report errors in the compiler-emitted block destroy method and everything called from it.
This is similar to https://reviews.llvm.org/D25857
Anna Zaks [Fri, 13 Jan 2017 00:50:41 +0000 (00:50 +0000)]
[analyzer] Fix false positives in Keychain API checker
The checker has several false positives that this patch addresses:
- Do not check if the return status has been compared to error (or no error) at the time when leaks are reported since the status symbol might no longer be alive. Instead, pattern match on the assume and stop tracking allocated symbols on error paths.
- The checker used to report error when an unknown symbol was freed. This could lead to false positives, let's not repot those. This leads to loss of coverage in double frees.
- Do not enforce that we should only call free if we are sure that error was not returned and the pointer is not null. That warning is too noisy and we received several false positive reports about it. (I removed: "Only call free if a valid (non-NULL) buffer was returned")
- Use !isDead instead of isLive in leak reporting. Otherwise, we report leaks for objects we loose track of. This change triggered change #1.
This also adds checker specific dump to the state.
Richard Smith [Fri, 13 Jan 2017 00:43:31 +0000 (00:43 +0000)]
Improve handling of instantiated thread_local variables in Itanium C++ ABI.
* Do not initialize these variables when initializing the rest of the
thread_locals in the TU; they have unordered initialization so they can be
initialized by themselves.
This fixes a rejects-valid bug: we would make the per-variable initializer
function internal, but put it in a comdat keyed off the variable, resulting
in link errors when the comdat is selected from a different TU (as the per
TU TLS init function tries to call an init function that does not exist).
* On Darwin, when we decide that we're not going to emit a thread wrapper
function at all, demote its linkage to External. Fixes a verifier failure
on explicit instantiation of a thread_local variable on Darwin.
Daniel Jasper [Thu, 12 Jan 2017 19:35:26 +0000 (19:35 +0000)]
clang-format: Treat braced lists like other complex parameters.
Specifically, wrap before them if they are multi-line so that we don't
create long hanging indents. This prevents having a lot of code
indented a lot in some cases.
Dehao Chen [Thu, 12 Jan 2017 16:29:25 +0000 (16:29 +0000)]
Pass -fprofile-sample-use to lto backends.
Summary: LTO backend will not invoke SampleProfileLoader pass even if -fprofile-sample-use is specified. This patch passes the flag down so that pass manager can add the SampleProfileLoader pass correctly.
Malcolm Parsons [Thu, 12 Jan 2017 16:11:28 +0000 (16:11 +0000)]
Tracking exception specification source locations
Summary:
We do not currently track the source locations for exception specifications such
that their source range can be queried through the AST. This leads to trying to
write more complex code to determine the source range for uses like FixItHints
(see D18575 for an example). In addition to use within tools like clang-tidy, I
think this information may become more important to track as exception
specifications become more integrated into the type system.
Alex Lorenz [Thu, 12 Jan 2017 10:48:03 +0000 (10:48 +0000)]
Avoid multiple -Wunreachable-code diagnostics that are triggered by
the same source range and use the unary operator fixit only when it
actually silences the warning.
Artem Dergachev [Thu, 12 Jan 2017 09:46:16 +0000 (09:46 +0000)]
[analyzer] Avoid a crash in DereferenceChecker on string literal initializers.
A hotfix for pr31592 that fixes the crash but not the root cause of the problem.
We need to update the analyzer engine further to account for AST changes
introduced in r289618. At the moment we're erroneously performing a redundant
lvalue-to-rvalue cast in this scenario, and squashing the rvalue of the object
bound to the reference into the reference itself.
Vassil Vassilev [Thu, 12 Jan 2017 09:16:26 +0000 (09:16 +0000)]
PR31469: Don't add friend template class decls to redecl chain in dependent contexts.
Fixes a crash in modules where the template class decl becomes the most recent
decl in the redeclaration chain and forcing the template instantiator try to
instantiate the friend declaration, rather than the template definition.
In practice, A::list<int> produces a TemplateSpecializationType
A::__1::list<int, allocator<type-parameter-0-0> >' failing to replace to
subsitute the default argument to allocator<int>.
Richard Smith [Thu, 12 Jan 2017 02:27:38 +0000 (02:27 +0000)]
Remove redundant passing around of a "ContainsAutoType" flag.
This flag serves no purpose other than to prevent us walking through a type to
check whether it contains an 'auto' specifier; this duplication of information
is error-prone, does not appear to provide any performance benefit, and will
become less practical once we support C++1z deduced class template types and
eventually constrained types from the Concepts TS.
Manman Ren [Wed, 11 Jan 2017 18:32:30 +0000 (18:32 +0000)]
This reverts r291628. As suggested by Richard, we can simply
filter out the implicilty imported modules at CodeGen instead of removing the
implicit ImportDecl when an implementation TU of a module imports a header of
that same module.
Devin Coughlin [Wed, 11 Jan 2017 01:02:34 +0000 (01:02 +0000)]
[analyzer] Fix crash in body farm for getter without implicit self.
Fix a crash in body farm when synthesizing a getter for a property
synthesized for a property declared in a protocol on a class extension
that shadows a declaration of the property in a category.
In this case, Sema doesn't fill in the implicit 'self' parameter for the getter
in the category, which leads to a crash when trying to synthesize the getter
for it.
To avoid the crash, skip getter synthesis in body farm if the self parameter is
not filled int.
Summary:
openSuse has AArch64 support, with images running on the Raspberry Pi 3.
The libraries and headers live under the aarch64-suse-linux subdirectory,
which is currently not in the AArch64 triples list. Address this by adding
the corresponding string to AArch64Triples.
Richard Smith [Tue, 10 Jan 2017 20:52:50 +0000 (20:52 +0000)]
Don't try to check implicit conversion sequences for an object argument if
there is no object argument, when early checking of implicit conversion
sequences for a function template fails.
Devin Coughlin [Tue, 10 Jan 2017 18:49:27 +0000 (18:49 +0000)]
[analyzer] Treat pointers to static member functions as function pointers
Sema treats pointers to static member functions as having function pointer
type, so treat treat them as function pointer values in the analyzer as well.
This prevents an assertion failure in SValBuilder::evalBinOp caused by code
that expects function pointers to be Locs (in contrast, PointerToMember values
are nonlocs).
[OpenMP] Basic support for a parallel directive in a target region on an NVPTX device
Summary:
This patch introduces support for the execution of parallel constructs in a target
region on the NVPTX device. Parallel regions must be in the lexical scope of the
target directive.
The master thread in the master warp signals parallel work for worker threads in worker
warps on encountering a parallel region.
Note: The patch does not yet support capture of arguments in a parallel region so
the test cases are simple.
Craig Topper [Tue, 10 Jan 2017 06:02:12 +0000 (06:02 +0000)]
AMD family 17h (znver1) enablement
Summary:
This patch enables the following
1. AMD family 17h architecture using "znver1" tune flag (-march, -mcpu).
2. ISAs that are enabled for "znver1" architecture.
3. Checks ADX isa from cpuid to identify "znver1" flag when -march=native is used.
4. ISAs FMA4, XOP are disabled as they are dropped from amdfam17.
5. For the time being, it uses the btver2 scheduler model.
6. Test file is updated to check this flag.
This is linked to llvm review item https://reviews.llvm.org/D28017
Patch by Ganesh Gopalasubramanian. Additional test cases added by Craig Topper.
Richard Smith [Mon, 9 Jan 2017 23:54:33 +0000 (23:54 +0000)]
Check that template template arguments match template template parameters
properly even when a non-type template parameter has a dependent type.
Previously, if a non-type template parameter was dependent, but not dependent
on an outer level of template parameter, we would not match the type of the
parameter. Under [temp.arg.template], we are supposed to check that the types
are equivalent, which means checking for syntactic equivalence in the dependent
case.
This also fixes some accepts-invalids when passing templates with auto-typed
non-type template parameters as template template arguments.
Richard Smith [Mon, 9 Jan 2017 21:40:40 +0000 (21:40 +0000)]
PR31587: Fix handling of __FUNCSIG__ in C.
Fix crash if __FUNCSIG__ is used in a function without a prototype, and use
"(void)" as parameter list instead of "()" for a function with a no-parameters
prototype, matching MSVC's observed behavior.
David L. Jones [Mon, 9 Jan 2017 21:38:07 +0000 (21:38 +0000)]
Allow constexpr construction of subobjects unconditionally, not just in C++14.
Summary:
Per https://wg21.link/CWG1677, the C++11 standard did not clarify that constant
initialization of an object allowed constexpr brace-or-equal initialization of
subobjects:
struct foo_t { union { int i; volatile int j; } u; };
__attribute__((__require_constant_initialization__))
static const foo_t x = {{0}};
Because foo_t::u has a volatile member, the initializer for x fails. However,
there is really no good reason, because this:
union foo_u { int i; volatile int j; };
__attribute__((__require_constant_initialization__))
static const foo_u x = {0};
does have a constant initializer.
(This was triggered by musl's pthread_mutex_t type when building under C++11.)
Michal Gorny [Mon, 9 Jan 2017 20:54:20 +0000 (20:54 +0000)]
[Frontend] Correct values of ATOMIC_*_LOCK_FREE to match builtin
Correct the logic used to set ATOMIC_*_LOCK_FREE preprocessor macros not
to rely on the ABI alignment of types. Instead, just assume all those
types are aligned correctly by default since clang uses safe alignment
for _Atomic types even if the underlying types are aligned to a lower
boundary by default.
For example, the 'long long' and 'double' types on x86 are aligned to
32-bit boundary by default. However, '_Atomic long long' and '_Atomic
double' are aligned to 64-bit boundary, therefore satisfying
the requirements of lock-free atomic operations.
This fixes PR #19355 by correcting the value of
__GCC_ATOMIC_LLONG_LOCK_FREE on x86, and therefore also fixing
the assumption made in libc++ tests. This also fixes PR #30581 by
applying a consistent logic between the functions used to implement
both interfaces.
Manman Ren [Mon, 9 Jan 2017 19:20:18 +0000 (19:20 +0000)]
PCH: fix a regression that reports a module is defined in both pch and pcm.
In r276159, we started to say that a module X is defined in a pch if we specify
-fmodule-name when building the pch. This caused a regression that reports
module X is defined in both pch and pcm if we generate the pch with
-fmodule-name=X and then in a separate clang invocation, we include the pch and
also import X.pcm.
This patch adds an option CompilingPCH similar to CompilingModule. When we use
-fmodule-name=X while building a pch, modular headers in X will be textually
included and the compiler knows that we are not building module X, so we don't
put module X in SUBMODULE_DEFINITION of the pch.
Reid Kleckner [Mon, 9 Jan 2017 17:27:17 +0000 (17:27 +0000)]
[MS] Mark default args of exported default constructors as used
Fixes a regression introduced in r291045, which would lead to link
errors. While we should no longer encounter unparsed or uninstantiated
default arguments in this codepath, we still need to call
CheckCXXDefaultArgExpr to mark the default argument expressions as
ODR-used.
Reid Kleckner [Mon, 9 Jan 2017 17:04:37 +0000 (17:04 +0000)]
[MS] Fix function type mangling of default ctor closures
Use the canonical decl in pointer comparisons with the default
constructor closure decl. Otherwise we don't produce the correct
"@@QAEXXZ" mangling, which essentially means "void(void) thiscall public
instance method".
Richard Smith [Mon, 9 Jan 2017 08:01:21 +0000 (08:01 +0000)]
Implement C++ DR1391 (wg21.link/cwg1391)
Check for implicit conversion sequences for non-dependent function
template parameters between deduction and substitution. The idea is to accept
as many cases as possible, on the basis that substitution failure outside the
immediate context is much more common during substitution than during implicit
conversion sequence formation.
This re-commits r290808, reverted in r290811 and r291412, with a couple of
fixes for handling of explicitly-specified non-trailing template argument
packs.
Richard Smith [Mon, 9 Jan 2017 07:14:40 +0000 (07:14 +0000)]
Implement DR1388 (wg21.link/cwg1388).
This issue clarifies how deduction proceeds past a non-trailing function
parameter pack. Essentially, the pack itself is skipped and consumes no
arguments (except for those implied by an explicitly-specified template
arguments), and nothing is deduced from it. As a small fix to the standard's
rule, we do not allow subsequent deduction to change the length of the function
parameter pack (by preventing extension of the explicitly-specified pack if
present, and otherwise deducing all contained packs to empty packs).
Faisal Vali [Mon, 9 Jan 2017 03:02:53 +0000 (03:02 +0000)]
[cxx1z-constexpr-lambda] Implement constant evaluation of non-capturing lambda expressions.
Add a visitor for lambda expressions to RecordExprEvaluator in ExprConstant.cpp that creates an empty APValue of Struct type to represent the closure object. Additionally, add a LambdaExpr visitor to the TemporaryExprEvaluator that forwards constant evaluation of immediately-called-lambda-expressions to the one in RecordExprEvaluator through VisitConstructExpr.
This patch supports:
constexpr auto ID = [] (auto a) { return a; };
static_assert(ID(3.14) == 3.14);
static_assert([](auto a) { return a + 1; }(10) == 11);
Lambda captures are still not supported for constexpr lambdas.
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