David Blaikie [Fri, 29 Aug 2014 16:53:14 +0000 (16:53 +0000)]
Provide a BuryPointer for unique_ptrs.
In theory, it'd be nice if we could move to a case where all buried
pointers were buried via unique_ptr to demonstrate that the program had
finished with the value (that we could really have cleanly deallocated
it) but instead chose to bury it.
I think the main reason that's not possible right now is the various
IntrusiveRefCntPtrs in the Frontend, sharing ownership for a variety of
compiler bits (see the various similar
"CompilerInstance::releaseAndLeak*" functions). I have yet to figure out
their correct ownership semantics - but perhaps, even if the
intrusiveness can be removed, the shared ownership may yet remain and
that would lead to a non-unique burying as is there today. (though we
could model that a little better - by passing in a shared_ptr, etc -
rather than needing the two step that's currently used in those other
releaseAndLeak* functions)
This might be a bit more robust if BuryPointer took the boolean:
BuryPointer(bool, unique_ptr<T>)
and the choice to bury was made internally - that way, even when
DisableFree was not set, the unique_ptr would still be null in the
caller and there'd be no chance of accidentally having a different
codepath where the value is used after burial in !DisableFree, but it
becomes null only in DisableFree, etc...
Benjamin Kramer [Fri, 29 Aug 2014 11:22:47 +0000 (11:22 +0000)]
ASTMatchers: Replace some copies of the bound nodes tree builder with moves.
But don't move if all we do is clearing the thing. The move method is too large
to be inlined and performs a ton of unnecessary checking when the RHS is empty.
James Molloy [Fri, 29 Aug 2014 10:17:52 +0000 (10:17 +0000)]
Use store size instead of alloc size when coercing.
Previously, EnterStructPointerForCoercedAccess used Alloc size when determining how to convert. This was problematic, because there were situations were the alloc size was larger than the store size. For example, if the first element of a structure were i24 and the destination type were i32, the old code would generate a GEP and a load i24. The code should compare store sizes to ensure the whole object is loaded. I have attached a test case.
This patch modifies the output of arm64-be-bitfield.c test case, but the new IR seems to be equivalent, and after -O3, the compiler generates identical ARM assembly. (asr x0, x0, #54)
Summary:
We did a great job getting this wrong:
- We messed up which LLVM IR types to use for arguments and return values.
The optimized libcalls use integer types for values.
Clang attempted to use the IR type which corresponds to the value
passed in instead of using an appropriately sized integer type. This
would result in violations of the ABI for, as an example, floating
point types.
- We didn't bother recording the result of the atomic libcall in the
destination memory.
Instead, call the functions with arguments matching the type of the
libcall prototype's parameters.
David Blaikie [Fri, 29 Aug 2014 07:25:23 +0000 (07:25 +0000)]
unique_ptrify Driver Action handling
It hits a limit when we reach ActionList, which is used for dynamic
conditional ownership, so we lose type safety there.
This did expose at least one caller "lying" about ownership (passing
ownership to an Action, then updating the Action to specify that it
doesn't actually own the thing that was passed) - changing this to
unique_ptr just makes that oddity more obvious.
David Blaikie [Fri, 29 Aug 2014 06:34:53 +0000 (06:34 +0000)]
Improve unique_ptr-y ownership in ASTUnit::ComputePreamble
Rather than having a pair of pairs and a reference out parameter, build
a structure with everything together and named. A raw pointer and a
unique_ptr, rather than a raw pointer and a boolean, are used to
communicate ownership transfer.
It's possible one day we'll end up with a conditional pointer (probably
represented by a raw pointer and a boolean) abstraction to use in places
like this. Conditional ownership seems to be coming up more often than
I'd hoped...
Craig Topper [Fri, 29 Aug 2014 06:05:01 +0000 (06:05 +0000)]
Use llvm::makeArrayRef instead of explicitly calling ArrayRef constructor and mentioning the type. This works now that we have a conversion from ArrayRef<T*> to ArrayRef<const T*>.
call __asan_load_cxx_array_cookie when loading array cookie in asan mode.
Summary:
The current implementation of asan cookie is incorrect:
we add nosanitize metadata to the cookie load, but the metadata may be lost
and we will instrument the load from poisoned memory.
This change replaces the load with a call to __asan_load_cxx_array_cookie (r216692)
Hans Wennborg [Fri, 29 Aug 2014 00:16:06 +0000 (00:16 +0000)]
Better codegen support for DLL attributes being dropped after the first declaration (PR20792)
For the following code:
__declspec(dllimport) int f(int x);
int user(int x) {
return f(x);
}
int f(int x) { return 1; }
Clang will drop the dllimport attribute in the AST, but CodeGen would have
already put it on the LLVM::Function, and that would never get updated.
(The same thing happens for global variables.)
This makes Clang check dropped DLL attribute case each time the LLVM object
is referenced.
This isn't perfect, because we will still get it wrong if the function is
never referenced by codegen after the attribute is dropped, but this handles
the common cases and makes us not fail in the verifier.
Alexey Samsonov [Thu, 28 Aug 2014 23:51:01 +0000 (23:51 +0000)]
Don't create a null reference in ASTUnit::LoadFromCommandLine.
This change is the last in the pack of five commits
(also see r216691, r216694, r216695, and r216696) that reduces the number
of test failures in "check-clang" invocation in UBSan bootstrap
from 2443 down to 5.
Rafael Espindola [Thu, 28 Aug 2014 21:23:05 +0000 (21:23 +0000)]
Call powerpc-darwin external tools with -arch ppc.
With this patch we call external tools for powerpc-darwin with "-arch ppc"
instead of "-arch powerpc", so as to be compatible with the cctools assembler
and ld64 linker.
Objective-C IRGen. Fixes an assertion crash caused by inconsistent
linkage related to generation of OBJC_SELECTOR_REFERENCES symbol
needed in generation of call to 'super' in a class method.
// rdar://18150301
Aaron Ballman [Thu, 28 Aug 2014 16:48:44 +0000 (16:48 +0000)]
Throw a std::bad_array_new_length exception when the expression (or constant-expression) passed to operator new[] results in overflow in conformance with [expr.new]p7. Fixes PR11644.
Oliver Stannard [Thu, 28 Aug 2014 12:15:49 +0000 (12:15 +0000)]
[ARM] Change default ABI for AArch32 to be "aapcs" (was "apcs-gnu")
The current default abi when no environment is given is "apcs-gnu",
which is obsolete. This patch changes the default to "aapcs". "aapcs" has both
hard- and soft-float variants, so the -mhard-float, -msoft-float and
-mfloat-abi= options now all behave as expected when no environment is
specified in the triple.
While writing this I also noticed that a preprocessor test claims to be
checking darwin, but is actually checking the defaults, which are
different for darwin.
Yi Kong [Thu, 28 Aug 2014 09:44:07 +0000 (09:44 +0000)]
arm_acle: Implement data processing intrinsics
Summary:
ACLE 2.0 section 9.2 defines the following "miscellaneous data processing intrinsics": `__clz`, `__cls`, `__ror`, `__rev`, `__rev16`, `__revsh` and `__rbit`.
`__clz` has already been implemented in the arm_acle.h header file. The rest are not supported yet. This patch completes ACLE data processing intrinsics.
Richard Smith [Thu, 28 Aug 2014 05:44:07 +0000 (05:44 +0000)]
[modules] When completing the redecl chain for an anonymous declaration in a
merged context, pull in the lexical decls in that context, since one of them
may complete the redecl chain.
Richard Trieu [Thu, 28 Aug 2014 03:23:47 +0000 (03:23 +0000)]
During cross field uninitialized checking, when processing an assignment,
don't mark the field as initialized until the next initializer instead of
instantly. Since this checker is AST based, statements are processed in tree
order instead of following code flow. This can result in different warnings
from just reordering the code. Also changed to use one checker per constructor
instead of creating a new checker per field.
Richard Smith [Wed, 27 Aug 2014 23:11:59 +0000 (23:11 +0000)]
[modules] Add an assert that we properly manage the IsCompleteDefinition flag
on CXXRecordDecls when merging definitions, and make it pass by not trying to
save and restore this flag across AST serialization/deserialization. For
CXXRecordDecls, we have a separate mechanism to manage this.
Richard Trieu [Wed, 27 Aug 2014 22:15:10 +0000 (22:15 +0000)]
More -Wuninitialized updates
Fix r216438 to catch more complicated self-initialized in std::move. For
instance, "Foo f = std::move(cond ? OtherFoo : (UNUSED_VALUE, f));"
Make sure that BinaryConditionalOperator, ConditionalOperator, BinaryOperator
with comma operator, and OpaqueValueExpr perform the correct usage forwarding
across the three uninitialized value checkers.
Query CompilationDatabase right before running each compilation.
Summary:
Query CompilationDatabase right before running each compilation. This allows
supporting compilation databases that change external state required for
successful compilation.
Hans Wennborg [Wed, 27 Aug 2014 21:27:40 +0000 (21:27 +0000)]
Allow adding dll attributes on certain redecls with a warning if the decl hasn't been used yet (PR20746)
This shouldn't really be allowed, but it comes up in real code (see PR). As
long as the decl hasn't been used there's no technical difficulty in supporting
it, so downgrade the error to a warning.
David Blaikie [Wed, 27 Aug 2014 20:54:45 +0000 (20:54 +0000)]
Overload SourceManager::overrideFileContents so that unconditionally passing ownership is explicitly done using unique_ptr.
Only those callers who are dynamically passing ownership should need the
3 argument form. Those accepting the default ("do pass ownership")
should do so explicitly with a unique_ptr now.
Objective-C. Change to method lookup rules to look
into primary class's named categories before looking
into their protocols. This is because categories are
part of the public interface and , just as primary class,
preference should be given to them before class
(and category) protocols. // rdar://18013929
Chandler Carruth [Wed, 27 Aug 2014 18:21:27 +0000 (18:21 +0000)]
Fix PR20773 which I introduced with a silly edit mistake in r216531.
Trivial fix, and I've made the gentoo tests more representative. With
the changes, they would have caught this failure.
Nico Weber [Wed, 27 Aug 2014 17:04:39 +0000 (17:04 +0000)]
Call ResolveExceptionSpec for non-OdrUsed functions.
In C++11, instantiation of exception specs is deferred. The instantiation is
done in MarkFunctionReferenced(), which wasn't called for non-OdrUsed functions,
which then caused an assert in codegen. Fixes PR19190, see the bug for details.
Objective-C. When multiple nullary selectors are found in
global pool in the course of method selection for
a messaging expression, select one with the most general
return type of 'id'. This is to remove type-mismatch
warning (which is useless) as result of random selection of
method with more restrictive return type. rdar://18095772
Oliver Stannard [Wed, 27 Aug 2014 16:31:57 +0000 (16:31 +0000)]
Allow __fp16 as a function arg or return type for AArch64
ACLE 2.0 allows __fp16 to be used as a function argument or return
type. This enables this for AArch64.
This also fixes an existing bug that causes clang to not allow
homogeneous floating-point aggregates with a base type of __fp16. This
is valid for AAPCS64, but not for AAPCS-VFP.
Ted Kremenek [Wed, 27 Aug 2014 15:14:15 +0000 (15:14 +0000)]
Add support for the static analyzer to synthesize function implementations from external model files.
Currently the analyzer lazily models some functions using 'BodyFarm',
which constructs a fake function implementation that the analyzer
can simulate that approximates the semantics of the function when
it is called. BodyFarm does this by constructing the AST for
such definitions on-the-fly. One strength of BodyFarm
is that all symbols and types referenced by synthesized function
bodies are contextual adapted to the containing translation unit.
The downside is that these ASTs are hardcoded in Clang's own
source code.
A more scalable model is to allow these models to be defined as source
code in separate "model" files and have the analyzer use those
definitions lazily when a function body is needed. Among other things,
it will allow more customization of the analyzer for specific APIs
and platforms.
This patch provides the initial infrastructure for this feature.
It extends BodyFarm to use an abstract API 'CodeInjector' that can be
used to synthesize function bodies. That 'CodeInjector' is
implemented using a new 'ModelInjector' in libFrontend, which lazily
parses a model file and injects the ASTs into the current translation
unit.
Models are currently found by specifying a 'model-path' as an
analyzer option; if no path is specified the CodeInjector is not
used, thus defaulting to the current behavior in the analyzer.
Models currently contain a single function definition, and can
be found by finding the file <function name>.model. This is an
initial starting point for something more rich, but it bootstraps
this feature for future evolution.
This patch was contributed by Gábor Horváth as part of his
Google Summer of Code project.
Some notes:
- This introduces the notion of a "model file" into
FrontendAction and the Preprocessor. This nomenclature
is specific to the static analyzer, but possibly could be
generalized. Essentially these are sources pulled in
exogenously from the principal translation.
Preprocessor gets a 'InitializeForModelFile' and
'FinalizeForModelFile' which could possibly be hoisted out
of Preprocessor if Preprocessor exposed a new API to
change the PragmaHandlers and some other internal pieces. This
can be revisited.
FrontendAction gets a 'isModelParsingAction()' predicate function
used to allow a new FrontendAction to recycle the Preprocessor
and ASTContext. This name could probably be made something
more general (i.e., not tied to 'model files') at the expense
of losing the intent of why it exists. This can be revisited.
- This is a moderate sized patch; it has gone through some amount of
offline code review. Most of the changes to the non-analyzer
parts are fairly small, and would make little sense without
the analyzer changes.
- Most of the analyzer changes are plumbing, with the interesting
behavior being introduced by ModelInjector.cpp and
ModelConsumer.cpp.
- The new functionality introduced by this change is off-by-default.
It requires an analyzer config option to enable.
Oliver Stannard [Wed, 27 Aug 2014 10:43:15 +0000 (10:43 +0000)]
Move some ARM-specific code from CGCall.cpp to TargetInfo.cpp
This tidies up some ARM-specific code added by r208417 to move it out
of the target-independent parts of clang into TargetInfo.cpp. This
also has the advantage that we can now flatten struct arguments to
variadic AAPCS functions.
Evgeniy Stepanov [Wed, 27 Aug 2014 09:46:54 +0000 (09:46 +0000)]
[asan] Restore asan-rt name on linux back to pre-r216380.
There is no reason to have different library names for shared and static
cases on linux. It also breaks Android where we install the shared asan-rt
library into the system and should keep the old name.
This change reverts most of r216380 limiting it to win32 targets only.
Chandler Carruth [Wed, 27 Aug 2014 08:41:41 +0000 (08:41 +0000)]
Significantly fix Clang's header search for Ubuntu (and possibly other
modern Debian-based distributions) due to on-going multiarch madness.
It appears that when the multiarch heeader search support went into the
clang driver, it went in in a quite bad state. The order of includes
completely failed to match the order exhibited by GCC, and in a specific
case -- when the GCC triple and the multiarch triple don't match as with
i686-linux-gnu and i386-linux-gnu -- we would absolutely fail to find
the libstdc++ target-specific header files.
I assume that folks who have been using Clang on Ubuntu 32-bit systems
have been applying weird patches to hack around this. I can't imagine
how else it could have worked. This was originally reported by a 64-bit
operating system user who had a 32-bit crosscompiler installed. We tried
to use that rather than the bi-arch support of the 64-bit compiler, but
failed due to the triple differences.
I've corrected all the wrong orderings in the existing tests and added
a specific test for the multiarch triple strings that are different in
a significant way. This should significantly improve the usability of
Clang when checked out vanilla from upstream onto Ubuntu machines with
an i686 GCC installation for whatever reason.
Justin Bogner [Wed, 27 Aug 2014 05:12:35 +0000 (05:12 +0000)]
Driver: Restore -fkeep-inline-functions as an ignored flag
Several options were moved to the clang_ignored_gcc_optimization group
in r213365, but -fkeep-inline-functions was accidentally dropped. This
restores the flag.
Richard Smith [Wed, 27 Aug 2014 04:59:42 +0000 (04:59 +0000)]
Fix representation of __attribute__((nonnull)) to support correctly modeling
the no-arguments case. Don't expand this to an __attribute__((nonnull(A, B,
C))) attribute, since that does the wrong thing for function templates and
varargs functions.
In passing, fix a grammar error in the diagnostic, a crash if
__attribute__((nonnull(N))) is applied to a varargs function,
a bug where the same null argument could be diagnosed multiple
times if there were multiple nonnull attributes referring to it,
and a bug where nonnull attributes would not be accumulated correctly
across redeclarations.
Richard Smith [Tue, 26 Aug 2014 23:29:11 +0000 (23:29 +0000)]
[modules] Don't assert when merging virtual functions that override other
functions. Also don't needlessly pull in non-canonical declarations of the
overridden virtual functions.
Keno Fischer [Tue, 26 Aug 2014 22:50:03 +0000 (22:50 +0000)]
Attempt to address cmake buildbot failure
CMake gets confused by the fact that both LLVM and Clang now have
a CodeGen unittest. Rename the target to avoid that. The new test
was also missing ProfileData (thanks to Julien Lerouge for
pointing that out)
Keno Fischer [Tue, 26 Aug 2014 22:10:15 +0000 (22:10 +0000)]
Don't segfault in EmitCXXGlobalInitFunc when main file is a membuf
Summary: When the main file is created from a membuffer, there is no file entry that can be retrieved. This uses "__GLOBAL_I_a" in that case which is what was always used before r208128.
Quentin Colombet [Tue, 26 Aug 2014 18:43:31 +0000 (18:43 +0000)]
[test/CodeGen/ARM] Update arm_neon_intrinsics test case to actually test the
lowering of the intrinsics.
Prior to this commit, most of the copy-related intrinsics could be optimized
away. The situation is still not ideal as there are several possibilities to
lower a given intrinsic. Currently, we match LLVM behavior.
c11- Check for c11 language option as documentation says
feature is c11 about nested struct declarations must have
struct-declarator-list. Without this change, code
which was meant for c99 breaks. rdar://18125536
Aaron Ballman [Tue, 26 Aug 2014 14:09:25 +0000 (14:09 +0000)]
This test was updated in r216397, but was failing on Windows due to mixed path separators as well as case sensitivity of the "no" in "no such file or directory." Rather than revert this file back to its original form, I've made some incredibly ugly regexes so that it will pass everywhere.
Note, the path this test reports a failure on (for my Windows setup) is: E:\llvm\llvm\tools\clang\test\Frontend/doesnotexist/somename
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