Aaron Ballman [Tue, 23 Jun 2015 17:14:51 +0000 (17:14 +0000)]
AttributeReference.rst is automatically generated by a server-side process currently. To cut down on accidental commits to this file that are not properly reflected in AttrDocs.td (such as r215806 - r215808), this file now contains nothing but a comment explaining the current state of affairs.
Aaron Ballman [Tue, 23 Jun 2015 13:41:03 +0000 (13:41 +0000)]
Moving r215806, r215807, and r215808 into AttrDocs.td. These changes were originally applied to the RST file that is automatically generated by the server, and so the changes were never properly reflected online once the server overwrote AttributeReference.rst.
NAKAMURA Takumi [Tue, 23 Jun 2015 08:37:21 +0000 (08:37 +0000)]
Tweak clang/test/Modules/modules-with-same-name.m to run with GnuWin32's find.exe on newer version of Windows.
It seems "*.pcm" would be expanded with current directory by NTOS 6.x's msvcrt. GnuWin32 utils are affected.
To avoid the issue, put an expression that msvcrt's glob won't match, like "*.pc[m]".
David Majnemer [Tue, 23 Jun 2015 07:31:11 +0000 (07:31 +0000)]
[MS ABI] Rework member pointer conversion
Member pointers in the MS ABI are made complicated due to the following:
- Virtual methods in the most derived class (MDC) might live in a
vftable in a virtual base.
- There are four different representations of member pointer: single
inheritance, multiple inheritance, virtual inheritance and the "most
general" representation.
- Bases might have a *more* general representation than classes which
derived from them, a most surprising result.
We believed that we could treat all member pointers as-if they were a
degenerate case of the multiple inheritance model. This fell apart once
we realized that implementing standard member pointers using this ABI
requires referencing members with a non-zero vbindex.
On a bright note, all but the virtual inheritance model operate rather
similarly. The virtual inheritance member pointer representation
awkwardly requires a virtual base adjustment in order to refer to
entities in the MDC.
However, the first virtual base might be quite far from the start of the
virtual base. This means that we must add a negative non-virtual
displacement.
However, things get even more complicated. The most general
representation interprets vbindex zero differently from the virtual
inheritance model: it doesn't reference the vbtable at all.
It turns out that this complexity can increase for quite some time:
consider a derived to base conversion from the most general model to the
multiple inheritance model...
To manage this complexity we introduce a concept of "normalized" member
pointer which allows us to treat all three models as the most general
model. Then we try to figure out how to map this generalized member
pointer onto the destination member pointer model. I've done my best to
furnish the code with comments explaining why each adjustment is
performed.
David Majnemer [Tue, 23 Jun 2015 07:31:07 +0000 (07:31 +0000)]
[MS ABI] Refactor member pointer generation
The MS ABI has very complicated member pointers. Don't attempt to
synthesize the final member pointer ab ovo usque ad mala in one go.
Instead, start with a member pointer which points to the declaration in
question as-if it's decl context was the target class. Then, utilize
our conversion logical to convert it to the target type.
This allows us to simplify how we think about member pointers because we
don't need to consider non-zero nv adjustments before we even generate
the member pointer. Furthermore, it gives our adjustment logic more
exposure by utilizing it in a common path.
Alexey Bataev [Tue, 23 Jun 2015 04:51:00 +0000 (04:51 +0000)]
[OPENMP] Do not emit references to original variables in 'private' clause.
Currently if the variable is captured in captured region, capture record for this region stores reference to this variable for future use. But we don't need to provide the reference to the original variable if it was explicitly marked as private in the 'private' clause of the OpenMP construct, this variable is replaced by private copy.
Differential Revision: http://reviews.llvm.org/D9550
Richard Smith [Mon, 22 Jun 2015 22:20:47 +0000 (22:20 +0000)]
[modules] When building a module, if there are multiple matches for a header
file in the loaded module maps and one of them is from the current module,
that's the right match.
Richard Smith [Mon, 22 Jun 2015 21:15:01 +0000 (21:15 +0000)]
[modules] Add a flag to disable the feature that permits conflicting redefinitions of internal-linkage symbols that are not visible.
Such conflicts are an accident waiting to happen, and this feature conflicts
with the desire to include existing headers into multiple modules and merge the
results. (In an ideal world, it should not be possible to export internal
linkage symbols from a module, but sadly the glibc and libstdc++ headers
provide 'static inline' functions in a few cases.)
Justin Bogner [Mon, 22 Jun 2015 18:47:10 +0000 (18:47 +0000)]
test: Set lit features appropriately when using asan and ubsan together
The asan/not_asan and ubsan/not_ubsan features weren't being set
correctly when LLVM_USE_SANITIZER is set to 'Address;Undefined'. Fix
this by doing substring instead of exact matching. Also simplify the
msan check for consistency.
Sema: add a helper for enumerating the TST id (NFC)
The same pattern was repeated a few times. Create a trivial helper method to
map the Type Specifier to an ID for the diagnostic. Flip the selection order on
one of the diagnostic messages to get the same ordering across all of the
messages. This makes the emission of the diagnostic slightly more legible by
changing the cascading ternary into a switch in a function. NFC.
Nico Weber [Sun, 21 Jun 2015 20:49:05 +0000 (20:49 +0000)]
Clean up CLCompatOptions.td a bit.
Move /Qvec flags from the "// Non-aliases:" section up to the "// Aliases:"
section since the flags are just aliases. For the same reason, move the
/vm flags the other way. Also reflow a few lines to 80 columns.
Justin Bogner [Sun, 21 Jun 2015 20:32:40 +0000 (20:32 +0000)]
ASTReader: Treat InputFileOffsets as unaligned to avoid UB
This is a better approach to fixing the undefined behaviour I tried to
fix in r240228. This data doesn't necessarily have suitable alignment
for uint64_t, so use unaligned_uint64_t instead.
This fixes 225 test failures when clang is built with ubsan.
Justin Bogner [Sat, 20 Jun 2015 22:31:04 +0000 (22:31 +0000)]
ASTReader: Copy input file offset data to avoid unaligned accesses
We interpret Blob as an array of uint64_t here, but there's no reason
to think that it has suitable alignment. Instead, read the data in in
an alignment-safe way and store it in a std::vector.
This fixes 225 test failures when clang is built with ubsan.
Adrian Prantl [Sat, 20 Jun 2015 18:53:08 +0000 (18:53 +0000)]
Introduce a PCHContainerOperations interface (NFC).
A PCHContainerOperations abstract interface provides operations for
creating and unwrapping containers for serialized ASTs (precompiled
headers and clang modules). The default implementation is
RawPCHContainerOperations, which uses a flat file for the output.
The main application for this interface will be an
ObjectFilePCHContainerOperations implementation that uses LLVM to
wrap the module in an ELF/Mach-O/COFF container to store debug info
alongside the AST.
Douglas Gregor [Fri, 19 Jun 2015 23:18:03 +0000 (23:18 +0000)]
Stop moving attributes off of a block literal's decl specifiers.
These usually apply to the return type. At one point this was necessary to
get some of them to apply to the entire block, but it appears that's working
anyway (see block-return.c).
Douglas Gregor [Fri, 19 Jun 2015 23:18:00 +0000 (23:18 +0000)]
Handle 'instancetype' in ParseDeclarationSpecifiers.
...instead of as a special case in ParseObjCTypeName with lots of
duplicated logic. Besides being a nice refactoring, this also allows
"- (instancetype __nonnull)self" in addition to "- (nonnull instancetype)self".
Douglas Gregor [Fri, 19 Jun 2015 23:17:46 +0000 (23:17 +0000)]
Allow the cf_returns_[not_]retained attributes to appear on out-parameters.
Includes a simple static analyzer check and not much else, but we'll also
be able to take advantage of this in Swift.
This feature can be tested for using __has_feature(cf_returns_on_parameters).
This commit also contains two fixes:
- Look through non-typedef sugar when deciding whether something is a CF type.
- When (cf|ns)_returns(_not)?_retained is applied to invalid properties,
refer to "property" instead of "method" in the error message.
Alexey Samsonov [Fri, 19 Jun 2015 21:36:47 +0000 (21:36 +0000)]
[Sanitizers] Provide better diagnostic for sanitizers unsupported for target triple.
Introduce ToolChain::getSupportedSanitizers() that would return the set
of sanitizers available on given toolchain. By default, these are
sanitizers which don't necessarily require runtime support and are
not toolchain- or architecture-dependent.
Sanitizers (ASan, DFSan, TSan, MSan etc.) which cannot function
without runtime library are marked as supported only on platforms
for which we actually build these runtimes.
This would allow more fine-grained checks in the future: for instance,
we have to restrict availability of -fsanitize=vptr to Mac OS 10.9+
(PR23539).
Update test cases accrodingly: add tests for certain unsupported
configurations, remove test cases for -fsanitize=vptr + PS4
integration, as we don't build the runtime for PS4 at the moment.
This change was first submitted as r239953 and reverted in r239958.
The problem was and still is in Darwin toolchains, which get the
knowledge about target platform too late after initializaition, while
now we require this information when ToolChain::getSanitizerArgs() is
called. r240170 works around this issue.
Alexey Samsonov [Fri, 19 Jun 2015 19:57:46 +0000 (19:57 +0000)]
[CFI] Require -flto instead of implying it.
Summary:
This is unfortunate, but would let us land http://reviews.llvm.org/D10467,
that makes ToolChains responsible for computing the set of sanitizers
they support.
Unfortunately, Darwin ToolChains doesn't know about actual OS they
target until ToolChain::TranslateArgs() is called. In particular, it
means we won't be able to construct SanitizerArgs for these ToolChains
before that.
This change removes SanitizerArgs::needsLTO() method, so that now
ToolChain::IsUsingLTO(), which is called very early, doesn't need
SanitizerArgs to implement this method.
Docs and test cases are updated accordingly. See
https://llvm.org/bugs/show_bug.cgi?id=23539, which describes why we
start all these.
Douglas Gregor [Fri, 19 Jun 2015 18:27:45 +0000 (18:27 +0000)]
Check for consistent use of nullability type specifiers in a header.
Adds a new warning (under -Wnullability-completeness) that complains
about pointer, block pointer, or member pointer declarations that have
not been annotated with nullability information (directly or inferred)
within a header that contains some nullability annotations. This is
intended to be used to help maintain the completeness of nullability
information within a header that has already been audited.
Note that, for performance reasons, this warning will underrepresent
the number of non-annotated pointers in the case where more than one
pointer is seen before the first nullability type specifier, because
we're only tracking one piece of information per header. Part of
rdar://problem/18868820.
Douglas Gregor [Fri, 19 Jun 2015 18:25:57 +0000 (18:25 +0000)]
Introduced pragmas for audited nullability regions.
Introduce the clang pragmas "assume_nonnull begin" and "assume_nonnull
end" in which we make default assumptions about the nullability of many
unannotated pointers:
- Single-level pointers are inferred to __nonnull
- NSError** in a (function or method) parameter list is inferred to
NSError * __nullable * __nullable.
- CFErrorRef * in a (function or method) parameter list is inferred
to CFErrorRef __nullable * __nullable.
- Other multi-level pointers are never inferred to anything.
Douglas Gregor [Fri, 19 Jun 2015 18:14:46 +0000 (18:14 +0000)]
Implement the 'null_resettable' attribute for Objective-C properties.
'null_resettable' properties are those whose getters return nonnull
but whose setters take nil, to "reset" the property to some
default. Implements rdar://problem/19051334.
Douglas Gregor [Fri, 19 Jun 2015 18:14:38 +0000 (18:14 +0000)]
Extend type nullability qualifiers for Objective-C.
Introduce context-sensitive, non-underscored nullability specifiers
(nonnull, nullable, null_unspecified) for Objective-C method return
types, method parameter types, and properties.
Introduce Objective-C-specific semantics, including computation of the
nullability of the result of a message send, merging of nullability
information from the @interface of a class into its @implementation,
etc .
This is the Objective-C part of rdar://problem/18868820.
Douglas Gregor [Fri, 19 Jun 2015 18:13:19 +0000 (18:13 +0000)]
Diagnose unsafe uses of nil and __nonnull pointers.
This generalizes the checking of null arguments to also work with
values of pointer-to-function, reference-to-function, and block
pointer type, using the nullability information within the underling
function prototype to extend non-null checking, and diagnoses returns
of 'nil' within a function with a __nonnull return type.
Note that we don't warn about nil returns from Objective-C methods,
because it's common for Objective-C methods to mimic the nil-swallowing
behavior of the receiver by checking ostensibly non-null parameters
and returning nil from otherwise non-null methods in that
case.
It also diagnoses (via a separate flag) conversions from nullable to
nonnull pointers. It's a separate flag because this warning can be noisy.
Eric Christopher [Fri, 19 Jun 2015 18:09:33 +0000 (18:09 +0000)]
Add a comment and FIXME based on the commit message that made the
intrinsic _mm_prefetch into a builtin rather than by textual inclusion
via the intrinsic headers.
Douglas Gregor [Fri, 19 Jun 2015 17:51:05 +0000 (17:51 +0000)]
Introduce type nullability specifiers for C/C++.
Introduces the type specifiers __nonnull, __nullable, and
__null_unspecified that describe the nullability of the pointer type
to which the specifier appertains. Nullability type specifiers improve
on the existing nonnull attributes in a few ways:
- They apply to types, so one can represent a pointer to a non-null
pointer, use them in function pointer types, etc.
- As type specifiers, they are syntactically more lightweight than
__attribute__s or [[attribute]]s.
- They can express both the notion of 'should never be null' and
also 'it makes sense for this to be null', and therefore can more
easily catch errors of omission where one forgot to annotate the
nullability of a particular pointer (this will come in a subsequent
patch).
Nullability type specifiers are maintained as type sugar, and
therefore have no effect on mangling, encoding, overloading,
etc. Nonetheless, they will be used for warnings about, e.g., passing
'null' to a method that does not accept it.
This is the C/C++ part of rdar://problem/18868820.
Douglas Katzman [Fri, 19 Jun 2015 14:55:19 +0000 (14:55 +0000)]
Add nominal support for 'shave' target.
This change passes through C and assembler jobs to Movidius tools by
constructing commands which are the same as ones produces by the examples
in the SDK. But rather than reference MV_TOOLS_DIR to find tools,
we will assume that binaries are installed wherever the Driver would
find its native tools. Similarly, this change assumes that -I options
will "just work" based on where SDK headers get installed, rather than
baking into the Driver some magic paths.
[ASan] Initial support for Kernel AddressSanitizer
This patch adds initial support for the -fsanitize=kernel-address flag to Clang.
Right now it's quite restricted: only out-of-line instrumentation is supported, globals are not instrumented, some GCC kasan flags are not supported.
Using this patch I am able to build and boot the KASan tree with LLVMLinux patches from github.com/ramosian-glider/kasan/tree/kasan_llvmlinux.
To disable KASan instrumentation for a certain function attribute((no_sanitize("kernel-address"))) can be used.
CFI: Implement bitset emission for the Microsoft ABI.
Clang's control flow integrity implementation works by conceptually attaching
"tags" (in the form of bitset entries) to each virtual table, identifying
the names of the classes that the virtual table is compatible with. Under
the Itanium ABI, it is simple to assign tags to virtual tables; they are
simply the address points, which are available via VTableLayout. Because any
overridden methods receive an entry in the derived class's virtual table,
a check for an overridden method call can always be done by checking the
tag of whichever derived class overrode the method call.
The Microsoft ABI is a little different, as it does not directly use address
points, and overrides in a derived class do not cause new virtual table entries
to be added to the derived class; instead, the slot in the base class is
reused, and the compiler needs to adjust the this pointer at the call site
to (generally) the base class that initially defined the method. After the
this pointer has been adjusted, we cannot check for the derived class's tag,
as the virtual table may not be compatible with the derived class. So we
need to determine which base class we have been adjusted to.
Specifically, at each call site, we use ASTRecordLayout to identify the most
derived class whose virtual table is laid out at the "this" pointer offset
we are using to make the call, and check the virtual table for that tag.
Because address point information is unavailable, we "reconstruct" it as
follows: any virtual tables we create for a non-derived class receive a tag
for that class, and virtual tables for a base class inside a derived class
receive a tag for the base class, together with tags for any derived classes
which are laid out at the same position as the derived class (and therefore
have compatible virtual tables).
Implement diagnostic mode for -fsanitize=cfi*, -fsanitize=cfi-diag.
This causes programs compiled with this flag to print a diagnostic when
a control flow integrity check fails instead of aborting. Diagnostics are
printed using UBSan's runtime library.
The main motivation of this feature over -fsanitize=vptr is fidelity with
the -fsanitize=cfi implementation: the diagnostics are printed under exactly
the same conditions as those which would cause -fsanitize=cfi to abort the
program. This means that the same restrictions apply regarding compiling
all translation units with -fsanitize=cfi, cross-DSO virtual calls are
forbidden, etc.
This flag controls whether a given sanitizer traps upon detecting
an error. It currently only supports UBSan. The existing flag
-fsanitize-undefined-trap-on-error has been made an alias of
-fsanitize-trap=undefined.
This change also cleans up some awkward behavior around the combination
of -fsanitize-trap=undefined and -fsanitize=undefined. Previously we
would reject command lines containing the combination of these two flags,
as -fsanitize=vptr is not compatible with trapping. This required the
creation of -fsanitize=undefined-trap, which excluded -fsanitize=vptr
(and -fsanitize=function, but this seems like an oversight).
Now, -fsanitize=undefined is an alias for -fsanitize=undefined-trap,
and if -fsanitize-trap=undefined is specified, we treat -fsanitize=vptr
as an "unsupported" flag, which means that we error out if the flag is
specified explicitly, but implicitly disable it if the flag was implied
by -fsanitize=undefined.
David Majnemer [Thu, 18 Jun 2015 20:20:10 +0000 (20:20 +0000)]
[MS ABI] Initialize "most general" member pointers which don't point at a vbase
The most general model has fields for the vbptr offset and the vbindex.
Don't initialize the vbptr offset if the vbindex is 0: we aren't
referencing an entity from a vbase.
Getting this wrong can make member pointer equality fail.
Gabor Ballabas [Thu, 18 Jun 2015 14:23:12 +0000 (14:23 +0000)]
Allow case-insensitive values for -march for AArch64 target in line with GCC.
GCC allows case-insensitive values for -mcpu, -march and -mtune options.
This patch implements the same behaviour for the -march option for the AArch64 target.
Daniel Jasper [Thu, 18 Jun 2015 12:32:59 +0000 (12:32 +0000)]
clang-format: [JS] Add a special case for indenting function literals.
Before:
var func =
function() {
doSomething();
};
After:
var func =
function() {
doSomething();
};
This is a very narrow special case which fixes most of the discrepency
with what our users do. In the long run, we should try to come up with
a more generic fix for indenting these.
Alexey Bataev [Thu, 18 Jun 2015 12:14:09 +0000 (12:14 +0000)]
[OPENMP] Support for '#pragma omp taskgroup' directive.
Added parsing, sema analysis and codegen for '#pragma omp taskgroup' directive (OpenMP 4.0).
The code for directive is generated the following way:
#pragma omp taskgroup
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