Eric Fiselier [Fri, 2 Sep 2016 18:53:31 +0000 (18:53 +0000)]
Implement __attribute__((require_constant_initialization)) for safe static initialization.
Summary:
This attribute specifies expectations about the initialization of static and
thread local variables. Specifically that the variable has a
[constant initializer](http://en.cppreference.com/w/cpp/language/constant_initialization)
according to the rules of [basic.start.static]. Failure to meet this expectation
will result in an error.
Static objects with constant initializers avoid hard-to-find bugs caused by
the indeterminate order of dynamic initialization. They can also be safely
used by other static constructors across translation units.
This attribute acts as a compile time assertion that the requirements
for constant initialization have been met. Since these requirements change
between dialects and have subtle pitfalls it's important to fail fast instead
of silently falling back on dynamic initialization.
```c++
// -std=c++14
#define SAFE_STATIC __attribute__((require_constant_initialization)) static
struct T {
constexpr T(int) {}
~T();
};
SAFE_STATIC T x = {42}; // OK.
SAFE_STATIC T y = 42; // error: variable does not have a constant initializer
// copy initialization is not a constant expression on a non-literal type.
```
This attribute can only be applied to objects with static or thread-local storage
duration.
Based on post-commit feedback over IRC with dblaikie, ideally, we should have a SmallVector constructor that accepts anything which can supply a range via ADL begin()/end() calls so that we can construct the SmallVector directly from anything range-like.
Since that doesn't exist right now, use a local variable instead of calling getAssocExprs() twice; NFC.
Eric Fiselier [Fri, 2 Sep 2016 18:25:29 +0000 (18:25 +0000)]
Implement __attribute__((require_constant_initialization)) for safe static initialization.
Summary:
This attribute specifies expectations about the initialization of static and
thread local variables. Specifically that the variable has a
[constant initializer](http://en.cppreference.com/w/cpp/language/constant_initialization)
according to the rules of [basic.start.static]. Failure to meet this expectation
will result in an error.
Static objects with constant initializers avoid hard-to-find bugs caused by
the indeterminate order of dynamic initialization. They can also be safely
used by other static constructors across translation units.
This attribute acts as a compile time assertion that the requirements
for constant initialization have been met. Since these requirements change
between dialects and have subtle pitfalls it's important to fail fast instead
of silently falling back on dynamic initialization.
```c++
// -std=c++14
#define SAFE_STATIC __attribute__((require_constant_initialization)) static
struct T {
constexpr T(int) {}
~T();
};
SAFE_STATIC T x = {42}; // OK.
SAFE_STATIC T y = 42; // error: variable does not have a constant initializer
// copy initialization is not a constant expression on a non-literal type.
```
This attribute can only be applied to objects with static or thread-local storage
duration.
Martin Probst [Fri, 2 Sep 2016 14:29:48 +0000 (14:29 +0000)]
clang-format: [JS] merge requoting replacements.
Summary:
When formatting source code that needs both requoting and reindentation,
merge the replacements to avoid erroring out for conflicting replacements.
Also removes the misleading Replacements parameter from the
TokenAnalyzer API.
Martin Probst [Fri, 2 Sep 2016 14:01:17 +0000 (14:01 +0000)]
clang-format: [JS] Sort all JavaScript imports if any changed.
Summary:
User feedback is that they expect *all* imports to be sorted if any import was
affected by a change, not just imports up to the first non-affected line, as
clang-format currently does.
Allow a C11 generic selection expression to select a function with the overloadable attribute as the result expression without crashing. This fixes PR30201.
Richard Smith [Fri, 2 Sep 2016 00:10:28 +0000 (00:10 +0000)]
Refactor to avoid holding a reference to a container element that could go away
during this function, and to avoid rolling back changes to the module manager's
data structures. Instead, we defer registering the module file until after we
have successfully finished loading it.
Remove excessive padding from MismatchingNewDeleteDetector
The class MismatchingNewDeleteDetector is in
lib/Sema/SemaExprCXX.cpp inside the anonymous namespace.
This diff reorders the fields and removes the excessive padding.
Test plan: make -j8 check-clang
Summary:
We want wasm and asmjs to have matching ABIs, and right now asmjs uses
unsigned int for its size_t. This causes exported symbols in libcxx to
not match and can cause weird breakage where libcxx doesn't get linked
as a result. Long-term we probably want wasm32, wasm64, and asmjs to
all use unsigned long, but that would cause unnecessary ABI churn for
asmjs so defer that until we can make all the ABI changes at once.
Richard Smith [Thu, 1 Sep 2016 20:15:25 +0000 (20:15 +0000)]
When we reach the end of a #include of a header of a local submodule that we
textually included, create an ImportDecl just as we would if we reached a
#include of any other modular header. This is necessary in order to correctly
determine the set of variables to initialize for an imported module.
This should hopefully make the modules selfhost buildbot green again.
Aleksei Sidorin [Thu, 1 Sep 2016 12:25:16 +0000 (12:25 +0000)]
[analyzer] Add more FileIDs to PlistDiagnostic map to avoid assertion
Some FileIDs that may be used by PlistDiagnostics were not added while building
a list of pieces. This caused assertion violation in GetFID() function.
This patch adds some missing FileIDs to avoid the assertion. It also contains
small refactoring of PlistDiagnostics::FlushDiagnosticsImpl().
Honggyu Kim [Thu, 1 Sep 2016 11:29:21 +0000 (11:29 +0000)]
[Frontend] Fix mcount inlining bug
Since some profiling tools, such as gprof, ftrace, and uftrace, use
-pg option to generate a mcount function call at the entry of each
function. Function invocation can be detected by this hook function.
But mcount insertion is done before function inlining phase in clang,
sometime a function that already has a mcount call can be inlined in the
middle of another function.
This patch adds an attribute "counting-function" to each function
rather than emitting the mcount call directly in frontend so that this
attribute can be processed in backend. Then the mcount calls can be
properly inserted in backend after all the other optimizations are
completed.
Richard Smith [Wed, 31 Aug 2016 23:23:25 +0000 (23:23 +0000)]
DR259: Demote the pedantic error for an explicit instantiation after an
explicit specialization to a warning for C++98 mode (this is a defect report
resolution, so per our informal policy it should apply in C++98), and turn
the warning on by default for C++11 and later. In all cases where it fires, the
right thing to do is to remove the pointless explicit instantiation.
Nick Lewycky [Wed, 31 Aug 2016 23:04:32 +0000 (23:04 +0000)]
Add -fprofile-dir= to clang.
-fprofile-dir=path allows the user to specify where .gcda files should be
emitted when the program is run. In particular, this is the first flag that
causes the .gcno and .o files to have different paths, LLVM is extended to
support this. -fprofile-dir= does not change the file name in the .gcno (and
thus where lcov looks for the source) but it does change the name in the .gcda
(and thus where the runtime library writes the .gcda file). It's different from
a GCOV_PREFIX because a user can observe that the GCOV_PREFIX_STRIP will strip
paths off of -fprofile-dir= but not off of a supplied GCOV_PREFIX.
To implement this we split -coverage-file into -coverage-data-file and
-coverage-notes-file to specify the two different names. The !llvm.gcov
metadata node grows from a 2-element form {string coverage-file, node dbg.cu}
to 3-elements, {string coverage-notes-file, string coverage-data-file, node
dbg.cu}. In the 3-element form, the file name is already "mangled" with
.gcno/.gcda suffixes, while the 2-element form left that to the middle end
pass.
Richard Smith [Wed, 31 Aug 2016 20:38:32 +0000 (20:38 +0000)]
Don't diagnoes a mismatch between implicit and explicit exception
specifications under -fno-exceptions, just as we don't diagnose other exception
specification mismatch errors.
Richard Smith [Wed, 31 Aug 2016 20:37:39 +0000 (20:37 +0000)]
Fix mishandling of deletedness for assignment operators of classes with
indirect virtual bases. We don't need to be able to invoke such an assignment
operator from the derived class, and we shouldn't delete the derived assignment
op if we can't do so.
Reid Kleckner [Wed, 31 Aug 2016 20:35:01 +0000 (20:35 +0000)]
[codeview] Don't emit vshape info for classes without vfptrs
Classes with no virtual methods or whose virtual methods were all
inherited from virtual bases don't have a vfptr at offset zero. We were
crashing attempting to get the layout of that non-existent vftable.
We don't need any vshape info in this case because the debugger can
infer it from the base class information. The current class may not
introduce any virtual methods if we are in this situation.
Reid Kleckner [Wed, 31 Aug 2016 16:11:43 +0000 (16:11 +0000)]
[codeview] Pass through vftable shape information
The shape is really just the number of methods in the vftable, since we
don't support 16 bit far calls. All calls are near. Encode this number
in the size of the artificial __vtbl_ptr_type DIDerivedType that we
generate. For DWARF, this will be a normal pointer, but for codeview
this will be a wide pointer that gets pattern matched into a
VFTableShape record. Insert this type into the element list of all
dynamic classes when emitting CodeView, so that the backend can emit the
shape even if the vptr lives in a primary base class.
Luke Drummond [Wed, 31 Aug 2016 13:36:36 +0000 (13:36 +0000)]
[clang-format-vim] Support vim linked against py3
clang-format.py previously only worked in vim compiled against python2.
This patch adds the necessary syntax changes to make this work with vim
linked against python3, which is now shipped by default for at least Ubuntu16 and Arch.
Sjoerd Meijer [Wed, 31 Aug 2016 12:31:03 +0000 (12:31 +0000)]
Revision r280064 adds new options -fdenormal-fp-math and passes through option
-ffast-math to CC1, but it included a wrong llvm regression tests which was
removed in r280065. Although regression test noexceptionsfpmath.c makes sure
-fno-trapping-math ends up as a function attribute, this adds a test that
explicitly checks the driver output for -fno-trapping-math.
Igor Kudrin [Wed, 31 Aug 2016 07:04:16 +0000 (07:04 +0000)]
[Coverage] Suppress creating a code region if the same area is covered by an expansion region.
In most cases these code regions are just redundant, but sometimes they
could be assigned to the counter of the parent code region instead of
the counter of the nested block.
Craig Topper [Wed, 31 Aug 2016 05:38:55 +0000 (05:38 +0000)]
[X86] Use v2i64 vectors to implement _mm_and/andn/or/xor_pd.
These will be reused when removing some builtins from avx512vldqintrin.h and this will make the tests for that change show a better number of vector elements.
Richard Smith [Wed, 31 Aug 2016 02:15:21 +0000 (02:15 +0000)]
PR12298 et al: don't recursively instantiate a template specialization from
within the instantiation of that same specialization. This could previously
happen for eagerly-instantiated function templates, variable templates,
exception specifications, default arguments, and a handful of other cases.
We still have an issue here for default template arguments that recursively
make use of themselves and likewise for substitution into the type of a
non-type template parameter, but in those cases we're producing a different
entity each time, so they should instead be caught by the instantiation depth
limit. However, currently we will typically run out of stack before we reach
it. :(
Richard Trieu [Wed, 31 Aug 2016 01:57:12 +0000 (01:57 +0000)]
Concatenate two FileCheck lines in a test.
'cc1' is a valid sequence of hexadecimal and sometimes can occur in the path
when testing. This can lead to FileCheck matching the incorrect occurance
of the 'cc1' string and causing a test failure. Join two adjacent flags
together into one check to prevent this.
Devin Coughlin [Tue, 30 Aug 2016 23:07:14 +0000 (23:07 +0000)]
[analyzer] Use lazily created buffer in EmptyLocalizationContextChecker
Fix a crash when relexing the underlying memory buffer to find incorrect
arguments to NSLocalizedString(). With precompiled headers, the raw
buffer may be NULL. Instead, use the source manager to get the buffer,
which will lazily create the buffer for precompiled headers.
On Windows, static libraries are named lib<name>.lib while import libraries are
named <name>.lib. Use the appropriate naming on itanium and msvc environments.
This is setup properly so that if a dynamic builtins is used on Windows, it
would do the right thing, although this is not currently wired through the
driver (i.e. there is no equivalent to -{shared,static}-gcc).
Vedant Kumar [Tue, 30 Aug 2016 20:36:48 +0000 (20:36 +0000)]
Revert "[test] Add libLTO as a clang test dependency on Darwin"
This reverts commit r280142. Mehdi suggested a better way to fix up the
test: just create a fake libLTO.dylib and tell the driver where to find
it. Patch incoming...
Vedant Kumar [Tue, 30 Aug 2016 19:57:40 +0000 (19:57 +0000)]
[test] Add libLTO as a clang test dependency on Darwin
Running 'check-clang' on a stock checkout of llvm+clang doesn't work on
Darwin, because test/Driver/darwin-ld-lto.c can't find libLTO.dylib. Add
libLTO as a clang test dependency on Darwin to fix the problem.
Note: We don't have this issue with check-all because libLTO is in the
test-depends target.
Richard Smith [Tue, 30 Aug 2016 19:13:18 +0000 (19:13 +0000)]
PR29166: when merging declarations with typedef names for linkage purposes,
don't assume that the anonymous struct will be part of the most recent
declaration of the typedef.
Richard Smith [Tue, 30 Aug 2016 19:06:26 +0000 (19:06 +0000)]
Unrevert r280035 now that the clang-cl bug it exposed has been fixed by
r280133. Original commit message:
C++ Modules TS: driver support for building modules.
This works as follows: we add --precompile to the existing gamut of options for
specifying how far to go when compiling an input (-E, -c, -S, etc.). This flag
specifies that an input is taken to the precompilation step and no further, and
this can be specified when building a .pcm from a module interface or when
building a .pch from a header file.
The .cppm extension (and some related extensions) are implicitly recognized as
C++ module interface files. If --precompile is /not/ specified, the file is
compiled (via a .pcm) to a .o file containing the code for the module (and then
potentially also assembled and linked, if -S, -c, etc. are not specified). We
do not yet suppress the emission of object code for other users of the module
interface, so for now this will only work if everything in the .cppm file has
vague linkage.
As with the existing support for module-map modules, prebuilt modules can be
provided as compiler inputs either via the -fmodule-file= command-line argument
or via files named ModuleName.pcm in one of the directories specified via
-fprebuilt-module-path=.
This also exposes the -fmodules-ts cc1 flag in the driver. This is still
experimental, and in particular, the concrete syntax is subject to change as
the Modules TS evolves in the C++ committee. Unlike -fmodules, this flag does
not enable support for implicitly loading module maps nor building modules via
the module cache, but those features can be turned on separately and used in
conjunction with the Modules TS support.
Olivier Goffart [Tue, 30 Aug 2016 17:42:29 +0000 (17:42 +0000)]
Fix colored diagnostics from tools
r271042 changed the way the diagnostic arguments are parsed. It assumes that
the diagnostics options were already parsed by the "Driver".
For tools using clang::Tooling, the diagnostics argument were not parsed.
Sjoerd Meijer [Tue, 30 Aug 2016 08:09:45 +0000 (08:09 +0000)]
This adds new options -fdenormal-fp-math and passes through option -ffast-math
to CC1, which are translated to function attributes and can e.g. be mapped on
build attributes FP_exceptions and FP_denormal. Setting these build attributes
allows better selection of floating point libraries.
Richard Smith [Tue, 30 Aug 2016 00:44:54 +0000 (00:44 +0000)]
C++ Modules TS: driver support for building modules.
This works as follows: we add --precompile to the existing gamut of options for
specifying how far to go when compiling an input (-E, -c, -S, etc.). This flag
specifies that an input is taken to the precompilation step and no further, and
this can be specified when building a .pcm from a module interface or when
building a .pch from a header file.
The .cppm extension (and some related extensions) are implicitly recognized as
C++ module interface files. If --precompile is /not/ specified, the file is
compiled (via a .pcm) to a .o file containing the code for the module (and then
potentially also assembled and linked, if -S, -c, etc. are not specified). We
do not yet suppress the emission of object code for other users of the module
interface, so for now this will only work if everything in the .cppm file has
vague linkage.
As with the existing support for module-map modules, prebuilt modules can be
provided as compiler inputs either via the -fmodule-file= command-line argument
or via files named ModuleName.pcm in one of the directories specified via
-fprebuilt-module-path=.
This also exposes the -fmodules-ts cc1 flag in the driver. This is still
experimental, and in particular, the concrete syntax is subject to change as
the Modules TS evolves in the C++ committee. Unlike -fmodules, this flag does
not enable support for implicitly loading module maps nor building modules via
the module cache, but those features can be turned on separately and used in
conjunction with the Modules TS support.
Igor Kudrin [Mon, 29 Aug 2016 11:48:50 +0000 (11:48 +0000)]
[Coverage] Prevent creating a redundant counter if a nested body ends with a macro.
If there were several nested statements arranged in a way that all of them
end up with the same macro, then the expansion of this macro was assigned
with all the corresponding counters of these statements.
As a result, the wrong counter value was shown for the macro in llvm-cov.
This patch fixes the issue by preventing adding a counter for an expanded
source range if it already has an assigned counter, which is expected
to come from the most specific statement.
Nico Weber [Fri, 26 Aug 2016 21:51:14 +0000 (21:51 +0000)]
clang-cl: Support MSVC2015's /validate-charset flag.
Clang always assumes that files are utf-8. If an invalidly encoded character is
used in an identifier, clang always errors. If it's used in a character
literal, clang warns Winvalid-source-encoding (on by default). Clang never
checks the encoding of things in comments (adding this seems like a nice
feature if it doesn't impact performance).
For cl.exe /utf-8 (which enables /validate-charset), if a bad character is used
in an identifier, it emits both an error and a warning. If it's used in a
literal or a comment, it emits a warning.
So mapping /validate-charset to -Winvalid-source-encoding seems like a fairly
decent fit.
Also makes -fexec-charset accept utf-8 case-insensitively.
Like https://reviews.llvm.org/D23807, but for execution-charset.
Also replace a few .lower() comparisons with equals_lower().
Manman Ren [Fri, 26 Aug 2016 17:16:46 +0000 (17:16 +0000)]
Don't diagnose non-modular includes when we are not compiling a module.
This is triggered when we are compiling an implementation of a module,
it has relative includes to a VFS-mapped module with umbrella headers.
Currently we will find the real path to headers under the umbrella directory,
but the umbrella directories are using virtual path.
Richard Smith [Fri, 26 Aug 2016 00:14:38 +0000 (00:14 +0000)]
C++ Modules TS: add frontend support for building pcm files from module
interface files. At the moment, all declarations (and no macros) are exported,
and 'export' declarations are not supported yet.
Richard Smith [Thu, 25 Aug 2016 18:26:30 +0000 (18:26 +0000)]
Refactor to remove the assumption that we know the name of the module we're emitting at the point when we create a PCHGenerator (with the C++ modules TS, we find that out part way through parsing the input).
Adrian McCarthy [Thu, 25 Aug 2016 18:24:35 +0000 (18:24 +0000)]
Omit column info for CodeView by default
Clang tracks only start columns, not start-end ranges. CodeView allows for that, but the VS debugger doesn't handle anything less than a complete range well--it either highlights the wrong part of a statement or truncates source lines in the assembly view. It's better to have no column information at all.
So by default, we'll omit the column information for CodeView targeting Windows.
Since the column info is still useful for sanitizers, I've promoted -gcolumn-info (and -gno-column-info) to a CoreOption and added a couple tests to make sure that works for clang-cl.
Reid Kleckner [Thu, 25 Aug 2016 18:23:28 +0000 (18:23 +0000)]
[MS] Pass non-trivially-copyable objects indirectly on Windows ARM
This isn't exactly what MSVC does, unfortunately. MSVC does not pass
objects with destructors but no copy constructors by address. More ARM
expertise is required to really understand what should be done here.
Richard Smith [Thu, 25 Aug 2016 00:34:00 +0000 (00:34 +0000)]
Lazily load the ContextDecl for a lambda's DefinitionData, to fix a
deserialization cycle caused by the ContextDecl recursively importing members
of the lambda's closure type.
projects / clang / log