[analyzer] Add generateErrorNode() APIs to CheckerContext.
The analyzer trims unnecessary nodes from the exploded graph before reporting
path diagnostics. However, in some cases it can trim all nodes (including the
error node), leading to an assertion failure (see
https://llvm.org/bugs/show_bug.cgi?id=24184).
This commit addresses the issue by adding two new APIs to CheckerContext to
explicitly create error nodes. Unless the client provides a custom tag, these
APIs tag the node with the checker's tag -- preventing it from being trimmed.
The generateErrorNode() method creates a sink error node, while
generateNonFatalErrorNode() creates an error node for a path that should
continue being explored.
The intent is that one of these two methods should be used whenever a checker
creates an error node.
This commit updates the checkers to use these APIs. These APIs
(unlike addTransition() and generateSink()) do not take an explicit Pred node.
This is because there are not any error nodes in the checkers that were created
with an explicit different than the default (the CheckerContext's Pred node).
It also changes generateSink() to require state and pred nodes (previously
these were optional) to reduce confusion.
Additionally, there were several cases where checkers did check whether a
generated node could be null; we now explicitly check for null in these places.
This commit also includes a test case written by Ying Yi as part of
http://reviews.llvm.org/D12163 (that patch originally addressed this issue but
was reverted because it introduced false positive regressions).
[WinEH] Pass the catch adjectives to catchpad directly
This avoids building a fake LLVM IR global variable just to ferry an i32
down into LLVM codegen. It also puts a nail in the coffin of using MS
ABI C++ EH with landingpads, since now we'll assert in the lpad code
when flags are present.
Anton Yartsev [Wed, 16 Sep 2015 18:12:15 +0000 (18:12 +0000)]
[analyzer] Improved behavior if Clang was not found, part II
- scan-build help: display 'Could not query Clang for the list of available checkers.' + the reason why it happened so if clang was not found.
- display requested/forced help in case of --use-analyzer=Xcode.
[analyzer] SATestBuild.py: Move additional checkers logic so SATestAdd.py can use it as well.
Move the logic looking for additional checkers in the SA_ADDITIONAL_CHECKERS
environmental variable from SATestBuild's main() to runScanBuild(). This allows
SATestAdd.py to use the variable as well. Without it, we won't include
additional checkers when building reference results for the build bot.
Fixed testing callback emission order to account for vptr.
Poison vtable in either complete or base dtor, depending on
if virtual bases exist. If virtual bases exist, poison in
complete dtor. Otherwise, poison in base.
Remove commented-out block.
Don't crash when passing &@selector to a _Nonnull parameter. Fixes PR24774.
The root cause here is that ObjCSelectorExpr is an rvalue, yet it can have its
address taken. That's kind of awkward, but fixing this is awkward in other
ways, see https://llvm.org/bugs/show_bug.cgi?id=24774#c16 . For now, just
fix the crash.
Chris Bieneman [Tue, 15 Sep 2015 21:52:42 +0000 (21:52 +0000)]
[CMake] Add cache scripts for Apple-style clang builds.
Summary:
These CMake cache scripts are my first pass at replicating Apple's packaging logic from autoconf. They can be used on any Darwin machine to approximate an Apple Clang build.
The included README file includes documentation and a sample CMake invocation.
Piotr Padlewski [Tue, 15 Sep 2015 21:46:55 +0000 (21:46 +0000)]
Decorating vptr load & stores with !invariant.group
Adding !invariant.group to vptr load/stores for devirtualization purposes.
For more goto:
http://lists.llvm.org/pipermail/cfe-dev/2015-July/044227.html
[OPENMP] Emit an additional note during analysis of 'if' clause.
Patch adds emission of additional note for 'if' clauses with name modifiers in case if 'if' clause without name modified was specified or 'if' clause with the same name modifier was specified.
Daniel Sanders [Tue, 15 Sep 2015 14:08:28 +0000 (14:08 +0000)]
Re-commit r247683: Replace Triple with a new TargetTuple in MCTargetDesc/* and related. NFC.
Summary:
This is the first patch in the series to migrate Triple's (which are ambiguous)
to TargetTuple's (which aren't).
For the moment, TargetTuple simply passes all requests to the Triple object it
holds. Once it has replaced Triple, it will start to implement the interface in
a more suitable way.
This change makes some changes to the public C++ API. In particular,
InitMCSubtargetInfo(), createMCRelocationInfo(), and createMCSymbolizer()
now take TargetTuples instead of Triples. The other public C++ API's have
been left as-is for the moment to reduce patch size.
This commit also contains a trivial patch to clang to account for the C++ API
change. Thanks go to Pavel Labath for fixing LLDB for me.
Daniel Sanders [Tue, 15 Sep 2015 13:17:40 +0000 (13:17 +0000)]
Replace Triple with a new TargetTuple in MCTargetDesc/* and related. NFC.
Summary:
This is the first patch in the series to migrate Triple's (which are ambiguous)
to TargetTuple's (which aren't).
For the moment, TargetTuple simply passes all requests to the Triple object it
holds. Once it has replaced Triple, it will start to implement the interface in
a more suitable way.
This change makes some changes to the public C++ API. In particular,
InitMCSubtargetInfo(), createMCRelocationInfo(), and createMCSymbolizer()
now take TargetTuples instead of Triples. The other public C++ API's have
been left as-is for the moment to reduce patch size.
This commit also contains a trivial patch to clang to account for the C++ API
change.
[OPENMP] Emit __kmpc_cancel_barrier() and code for 'cancellation point' only if 'cancel' is found.
Patch improves codegen for OpenMP constructs. If the OpenMP region does not have internal 'cancel' construct, a call to 'void __kmpc_barrier()' runtime function is generated for all implicit/explicit barriers. If the region has inner 'cancel' directive, then
```
if (__kmpc_cancel_barrier())
exit from outer construct;
```
code is generated.
Also, the code for 'canellation point' directive is not generated if parent directive does not have 'cancel' directive.
[analyzer] Restore behavior change introduced by r247657.
r247657 fixed warnings about unused variables when compiling without asserts
but changed behavior. This commit restores the old behavior but still suppresses
the warnings.
Richard Smith [Tue, 15 Sep 2015 01:28:55 +0000 (01:28 +0000)]
[modules] A using-declaration doesn't introduce a new entity, just a new name
for an existing entity, and as such a using-declaration doesn't need to
conflict with a hidden entity (nor vice versa).
[analyzer] Skip Pre/Post handlers for ObjC calls when receiver is nil.
In Objective-C, method calls with nil receivers are essentially no-ops. They
do not fault (although the returned value may be garbage depending on the
declared return type and architecture). Programmers are aware of this
behavior and will complain about a false alarm when the analyzer
diagnoses API violations for method calls when the receiver is known to
be nil.
Rather than require each individual checker to be aware of this behavior
and suppress a warning when the receiver is nil, this commit
changes ExprEngineObjC so that VisitObjCMessage skips calling checker
pre/post handlers when the receiver is definitely nil. Instead, it adds a
new event, ObjCMessageNil, that is only called in that case.
The CallAndMessageChecker explicitly cares about this case, so I've changed it
to add a callback for ObjCMessageNil and moved the logic in PreObjCMessage
that handles nil receivers to the new callback.
David Majnemer [Tue, 15 Sep 2015 01:00:55 +0000 (01:00 +0000)]
[MS ABI] Overwide bool bitfields should be permitted
Overwide bool bitfields have eight bits of storage size, make sure we
take the padding into account when determining whether or not they are
problematic.
Piotr Padlewski [Tue, 15 Sep 2015 00:37:06 +0000 (00:37 +0000)]
Generating assumption loads of vptr after ctor call (fixed)
Generating call assume(icmp %vtable, %global_vtable) after constructor
call for devirtualization purposes.
For more info go to:
http://lists.llvm.org/pipermail/cfe-dev/2015-July/044227.html
Edit:
Fixed version because of PR24479 and other bug caused in chrome.
After this patch got reverted because of ScalarEvolution bug (D12719)
Merged after John McCall big patch (Added Address).
Stephen Canon [Tue, 15 Sep 2015 00:21:56 +0000 (00:21 +0000)]
Prevent implicit re-interpret casts between ExtVector and Scalar types.
Previously, in certain cases lax vector conversions could occur between scalar floating-point values and ExtVector types; these conversions would be simple bitcasts. We need to allow them with other vector types to support some common headers, but we don't need them for ExtVector. Preventing them here makes them behave like other operations involving scalars and ExtVectors.
Dan Gohman [Mon, 14 Sep 2015 21:56:37 +0000 (21:56 +0000)]
[WebAssembly] Define the atomic type sizes
WebAssembly's spec has now been updated to specify some guarantees
about lock free atomic accesses. Update clang to match.
This also updates sig_atomic_t to be 64-bit on wasm64. WebAssembly
does not presently have asynchronous interrupts, but this change is
within the spirit of how they will work if they are added.
PR24595: Ignore calling convention modifiers for structors in MS ABI.
MS compiler ignores calling convention modifiers for structors. This patch makes
clang do the same (for MS ABI). This fixes PR24595 and makes vswriter.h header
(from Windows SDK 8.1) compilable.
Rafael Espindola [Mon, 14 Sep 2015 19:30:53 +0000 (19:30 +0000)]
[Solaris] Add -lc also when linking shared libraries
This is actually needed, otherwise libc won't be added at all. For
instance when building libclang.so all the libc symbols won't be
found, with ld warning about libc being an "implicit dependency".
David Blaikie [Mon, 14 Sep 2015 18:02:04 +0000 (18:02 +0000)]
Revert "[opaque pointer type] update for LLVM API change"
This was the wrong direction to take anyway (because ultimately the
GlobalValue needed the pointee type again and /it/ used
PointerType::getElementType eventually anyway)... let's go a different way.
Current implementation may end up emitting an undefined reference for
an "inline __attribute__((always_inline))" function by generating an
"available_externally alwaysinline" IR function for it and then failing to
inline all the calls. This happens when a call to such function is in dead
code. As the inliner is an SCC pass, it does not process dead code.
Libc++ relies on the compiler never emitting such undefined reference.
With this patch, we emit a pair of
1. internal alwaysinline definition (called F.alwaysinline)
2a. A stub F() { musttail call F.alwaysinline }
-- or, depending on the linkage --
2b. A declaration of F.
The frontend ensures that F.inlinefunction is only used for direct
calls, and the stub is used for everything else (taking the address of
the function, really). Declaration (2b) is emitted in the case when
"inline" is meant for inlining only (like __gnu_inline__ and some
other cases).
This approach, among other nice properties, ensures that alwaysinline
functions are always internal, making it impossible for a direct call
to such function to produce an undefined symbol reference.
This patch is based on ideas by Chandler Carruth and Richard Smith.
Richard Smith [Fri, 11 Sep 2015 22:39:35 +0000 (22:39 +0000)]
[modules] When picking one of two template declarations as a lookup result,
it's not sufficient to prefer the declaration with more default arguments, or
the one that's visible; they might both be visible, but one of them might have
a visible default argument where the other has a hidden default argument.
Chris Bieneman [Fri, 11 Sep 2015 20:42:57 +0000 (20:42 +0000)]
[CMake] [Darwin] Add support for building bootstrap builds with -flto
When building with LTO the bootstrap builds need to depend on libLTO, llvm-ar, and llvm-ranlib, which all need to be passed into the bootstrap build. This functionality only works on Darwin.
Anton Yartsev [Fri, 11 Sep 2015 20:41:09 +0000 (20:41 +0000)]
[analyzer] Improve behavior if Clang not found.
- Eliminate 'No such file or directory at scan-build line ...' error if '$RealBin/bin/clang' or '$RealBin/clang' directory does not exist.
- Eliminate 'Use of uninitialized value $Clang in concatenation (.) or string at scan-build line ...' error if help is displayed while $Clang was not found.
Current implementation may end up emitting an undefined reference for
an "inline __attribute__((always_inline))" function by generating an
"available_externally alwaysinline" IR function for it and then failing to
inline all the calls. This happens when a call to such function is in dead
code. As the inliner is an SCC pass, it does not process dead code.
Libc++ relies on the compiler never emitting such undefined reference.
With this patch, we emit a pair of
1. internal alwaysinline definition (called F.alwaysinline)
2a. A stub F() { musttail call F.alwaysinline }
-- or, depending on the linkage --
2b. A declaration of F.
The frontend ensures that F.inlinefunction is only used for direct
calls, and the stub is used for everything else (taking the address of
the function, really). Declaration (2b) is emitted in the case when
"inline" is meant for inlining only (like __gnu_inline__ and some
other cases).
This approach, among other nice properties, ensures that alwaysinline
functions are always internal, making it impossible for a direct call
to such function to produce an undefined symbol reference.
This patch is based on ideas by Chandler Carruth and Richard Smith.
projects / clang / log