Jordan Rose [Mon, 11 Jun 2012 23:20:52 +0000 (23:20 +0000)]
[analyzer] Treat LValueBitCasts like regular pointer bit casts.
These casts only appear in very well-defined circumstances, in which the
target of a reinterpret_cast or a function formal parameter is an lvalue
reference. According to the C++ standard, the following are equivalent:
Hal Finkel [Mon, 11 Jun 2012 22:35:19 +0000 (22:35 +0000)]
Add PPC support for translating gcc-style -mcpu options into LLVM -target-cpu options.
This functionality is based on what is done on ARM, and enables selecting PPC CPUs
in a way compatible with gcc's driver. Also, mirroring gcc (and what is done on x86),
-mcpu=native support was added. This uses the host cpu detection from LLVM
(which will also soon be updated by refactoring code currently in backend).
In order for this to work, the target needs a list of valid CPUs -- we now accept all CPUs accepted by LLVM.
A few preprocessor defines for common CPU types have been added.
Jordan Rose [Mon, 11 Jun 2012 16:40:41 +0000 (16:40 +0000)]
[analyzer] Add ObjCLoopChecker: objects from NSArray et al are non-nil.
While collections containing nil elements can still be iterated over in an
Objective-C for-in loop, the most common Cocoa collections -- NSArray,
NSDictionary, and NSSet -- cannot contain nil elements. This checker adds
that assumption to the analyzer state.
This was the cause of some minor false positives concerning CFRelease calls
on objects in an NSArray.
Jordan Rose [Mon, 11 Jun 2012 16:40:37 +0000 (16:40 +0000)]
[analyzer] When looking for a known class, only traverse the hierarchy once.
This has a small hit in the case where only one class is interesting
(NilArgChecker) but is a big improvement when looking for one of several
interesting classes (VariadicMethodTypeChecker), in which the most common
case is that there is no match.
James Dennett [Mon, 11 Jun 2012 06:19:40 +0000 (06:19 +0000)]
Documentation cleanup, fixing Doxygen markup. Mostly this avoids common terms
such as "protocol" and "expression" being implicitly turned into links to
mistakenly-generated Doxygen pages:
- Escaping @ symbols when Doxygen would otherwise incorrectly interpret them;
- Escaping # symbols when they're not intended as explicit Doxygen link
requests, such as when discussing preprocessor directives;
- In one odd case, unescaping @ in @__experimental_modules_import, because
Doxygen wrote '\@' to the output in that case, causing the example in the
description of ImportDecl to be wrong; and
- Fixing a typo: @breif -> @brief.
Richard Smith [Sun, 10 Jun 2012 07:07:24 +0000 (07:07 +0000)]
Remove CXXRecordDecl flags which are unused after r158289.
We need an efficient mechanism to determine whether a defaulted default
constructor is constexpr, in order to determine whether a class is a literal
type, so keep the incrementally-built form on CXXRecordDecl. Remove the
on-demand computation of same, so that we only have one method for determining
whether a default constructor is constexpr. This doesn't affect correctness,
since default constructor lookup is much simpler than selecting a constructor
for copying or moving.
We don't need a corresponding mechanism for defaulted copy or move constructors,
since they can't affect whether a type is a literal type. Conversely, checking
whether such functions are constexpr can require non-trivial effort, so we defer
such checks until the copy or move constructor is required.
Thus we now only compute whether a copy or move constructor is constexpr on
demand, and only compute whether a default constructor is constexpr in advance.
This is unfortunate, but seems like the best solution.
Richard Smith [Sun, 10 Jun 2012 05:43:50 +0000 (05:43 +0000)]
Fix PR13052 properly, by performing special member lookup to determine whether
an explicitly-defaulted default constructor would be constexpr. This is
necessary in weird (but well-formed) cases where a class has more than one copy
or move constructor.
Cleanup of now-unused parts of CXXRecordDecl to follow.
Richard Smith [Sun, 10 Jun 2012 03:12:00 +0000 (03:12 +0000)]
PR13064: Store whether an in-class initializer uses direct or copy
initialization, and use that information to produce the right kind of
initialization during template instantiation.
[C++11 Compat] Fix breaking change in C++11 pair copyctor.
While this code is valid C++98, it is not valid C++11. The problem can be
reduced to:
class MDNode;
class DIType {
operator MDNode*() const {return 0;}
};
class WeakVH {
WeakVH(MDNode*) {}
};
int main() {
DIType di;
std::pair<void*, WeakVH> p(std::make_pair((void*)0, di)));
}
This was not detected by any of the bots we have because they either compile
C++98 with libstdc++ (which allows it), or C++11 with libc++ (which incorrectly
allows it). I ran into the problem when compiling with VS 2012 RC.
Jordan Rose [Fri, 8 Jun 2012 21:14:25 +0000 (21:14 +0000)]
Disallow using ObjC literals in direct comparisons (== and friends).
Objective-C literals conceptually always create new objects, but may be
optimized by the compiler or runtime (constant folding, singletons, etc).
Comparing addresses of these objects is relying on this optimization
behavior, which is really an implementation detail.
In the case of == and !=, offer a fixit to a call to -isEqual:, if the
method is available. This fixit is directly on the error so that it is
automatically applied.
Most of the time, this is really a newbie mistake, hence the fixit.
Jordan Rose [Fri, 8 Jun 2012 21:14:19 +0000 (21:14 +0000)]
If fixits appear to overlap, move the second one over in the output.
This occurs when you have two insertions and the first one is so long that the
second fixit's column is before the first fixit ends. The edits themselves
don't actually overlap, but our command-line preview does.
Richard Smith [Fri, 8 Jun 2012 21:09:22 +0000 (21:09 +0000)]
PR13051: If a constructor is explicitly defaulted, it isn't marked as being
constexpr until we get to the end of the class definition. When that happens,
be sure to remember that the class actually does have a constexpr constructor.
This is a stopgap solution, which still doesn't cover the case of a class with
multiple copy constructors (only some of which are constexpr). We should be
performing constructor lookup when implicitly defining a constructor in order
to determine whether all constructors it invokes are constexpr.
Anna Zaks [Fri, 8 Jun 2012 18:44:43 +0000 (18:44 +0000)]
[analyzer] MallocSizeofChecker false positive: when sizeof is argument
to addition.
We should not to warn in case the malloc size argument is an
addition containing 'sizeof' operator - it is common to use the pattern
to pack values of different sizes into a buffer.
Jordan Rose [Fri, 8 Jun 2012 18:06:21 +0000 (18:06 +0000)]
Disable _Pragma during HTML macro rewriting to keep from crashing.
The preprocessor's handling of diagnostic push/pops is stateful, so
encountering pragmas during a re-parse causes problems. HTMLRewrite
already filters out normal # directives including #pragma, so it's
clear it's not expected to be interpreting pragmas in this mode.
This fix adds a flag to Preprocessor to explicitly disable pragmas.
The "right" fix might be to separate pragma lexing from pragma
parsing so that we can throw away pragmas like we do preprocessor
directives, but right now it's important to get the fix in.
Note that this has nothing to do with the "hack" of re-using the
input preprocessor in HTMLRewrite. Even if we someday copy the
preprocessor instead of re-using it, the copy would (and should) include
the diagnostic level tables and have the same problems.
[libclang/AST]
AST: For auto-synthesized ivars give them the location of the related
property (previously they had no source location). This allows them
to be indexed by libclang.
libclang: Make sure synthesized ivars are indexed before the methods that
may reference them.
Rename a test case to a more generic name. This is a completely useless
test, but David Sehr is looking at spiffing it up and adding some proper
tests for our alloca codegen.
Anna Zaks [Fri, 8 Jun 2012 00:04:43 +0000 (00:04 +0000)]
[analyzer] Add experimental "issue hash" to the plist diagnostic.
CmpRuns.py can be used to compare issues from different analyzer runs.
Since it uses the issue line number to unique 2 issues, adding a new
line to the beginning of a file makes all issues in the file reported as
new.
The hash will be an opaque value which could be used (along with the
function name) by CmpRuns to identify the same issues. This way, we only
fail to identify the same issue from two runs if the function it appears
in changes (not perfect, but much better than nothing).
Kaelyn Uhrain [Thu, 7 Jun 2012 23:57:12 +0000 (23:57 +0000)]
Teach the FixIt in DiagnoseInvalidRedeclaration how to replace the written
nested name specifiers in addition to the function's identifier when the
correction has a different nested name specifier.
Anna Zaks [Thu, 7 Jun 2012 20:18:08 +0000 (20:18 +0000)]
[analyzer] Fixit for r158136.
I falsely assumed that the memory spaces are equal when we reach this
point, they might not be when memory space of one or more is stack or
Unknown. We don't want a region from Heap space alias something with
another memory space.
This patch affects docs only, and includes formatting changes only
(though those include some fixes for broken Doxygen markup that caused
some content to be missing from generated pages). It avoids generating
many spurious pages such as
http://clang.llvm.org/doxygen/classRepresents.html, but likely not all
yet.
Benjamin Kramer [Thu, 7 Jun 2012 15:09:51 +0000 (15:09 +0000)]
Plug a long standing memory leak in TemplateArgument.
The integral APSInt value is now stored in a decomposed form and the backing
store for large values is allocated via the ASTContext. This way its not
leaked as TemplateArguments are never destructed when they are allocated in
the ASTContext. Since the integral data is immutable it is now shared between
instances, making copying TemplateArguments a trivial operation.
Currently getting the integral data out of a TemplateArgument requires creating
a new APSInt object. This is cheap when the value is small but can be expensive
if it's not. If this turns out to be an issue a more efficient accessor could
be added.
Anna Zaks [Thu, 7 Jun 2012 03:57:32 +0000 (03:57 +0000)]
[analyzer] Anti-aliasing: different heap allocations do not alias
Add a concept of symbolic memory region belonging to heap memory space.
When comparing symbolic regions allocated on the heap, assume that they
do not alias.
Use symbolic heap region to suppress a common false positive pattern in
the malloc checker, in code that relies on malloc not returning the
memory aliased to other malloc allocations, stack.
Jordan Rose [Thu, 7 Jun 2012 01:10:31 +0000 (01:10 +0000)]
Insert a space if necessary when suggesting CFBridgingRetain/Release.
This was a problem for people who write 'return(result);'
Also fix ARCMT's corresponding code, though there's no test case for this
because implicit casts like this are rejected by the migrator for being
ambiguous, and explicit casts have no problem.
Manuel Klimek [Wed, 6 Jun 2012 21:28:13 +0000 (21:28 +0000)]
Switches the RewriterTestContext away from PathV1.
Now the ToolingTests all work on Windows, and they also clean up their temporary directory if they don't crash.
Douglas Gregor [Wed, 6 Jun 2012 21:18:07 +0000 (21:18 +0000)]
Whenever we have a BalancedDelimiterTracker, we have a 'nested' scope
where '>' is going to behave as an operator (and not as a '>' closing
a template argument list).
David Blaikie [Wed, 6 Jun 2012 20:45:41 +0000 (20:45 +0000)]
Revert Decl's iterators back to pointer value_type rather than reference value_type
In addition, I've made the pointer and reference typedef 'void' rather than T*
just so they can't get misused. I would've omitted them entirely but
std::distance likes them to be there even if it doesn't use them.
This rolls back r155808 and r155869.
Review by Doug Gregor incorporating feedback from Chandler Carruth.
In standard C since C89, a 'translation-unit' is syntactically defined to have
at least one "external-declaration", which is either a decl or a function
definition. In Clang the latter gives us a declaration as well.
The tricky bit about this warning is that our predefines can contain external
declarations (__builtin_va_list and the 128-bit integer types). Therefore our
AST parser now makes sure we have at least one declaration that doesn't come
from the predefines buffer.
Also, remove bogus warning about empty source files. This doesn't catch source
files that only contain comments, and never fired anyway because of our
predefines.
Francois Pichet [Wed, 6 Jun 2012 12:00:10 +0000 (12:00 +0000)]
Zap the /Za compiler switch from MSVC projects, the option is considered harmful even by Microsoft people and clang won't build using the MSVC 2012 RC if not removed.
Only 1 minor code change was necessary: can't use cdecl as variable name anymore.
Daniel Jasper [Wed, 6 Jun 2012 08:32:04 +0000 (08:32 +0000)]
Introduce -Wunused-private-field. If enabled, this warning detects
unused private fields of classes that are fully defined in the current
translation unit.
Ted Kremenek [Tue, 5 Jun 2012 22:00:52 +0000 (22:00 +0000)]
PlistDiagnostics: force the ranges for control-flow edges to be single locations, forcing
adjacent edges to have compatible ranges. This simplifies the layout logic for some clients.
projects / clang / log