David Blaikie [Mon, 20 May 2013 22:50:41 +0000 (22:50 +0000)]
PR14606: Debug Info for namespace aliases/DW_TAG_imported_module
This resolves the last of the PR14606 failures in the GDB 7.5 test
suite. (but there are still unresolved issues in the imported_decl case
- we need to implement optional/lazy decls for functions & variables
like we already do for types)
Objective-C [qoi]: When an class conforms to multiple
protocols that declare the same property of incompatible
types, issue a warning when class implementation synthesizes
the property. // rdar://13075400
[ms-cxxabi] Look up operator delete() at every virtual dtor declaration.
While the C++ standard requires that this lookup take place only at the
definition point of a virtual destructor (C++11 [class.dtor]p12), the
Microsoft ABI may require the compiler to emit a deleting destructor
for any virtual destructor declared in the TU, including ones without
a body, requiring an operator delete() lookup for every virtual
destructor declaration. The result of the lookup should be the same
no matter which declaration is used (except in weird corner cases).
This change will cause us to reject some valid TUs in Microsoft ABI
mode, e.g.:
struct A {
void operator delete(void *);
};
struct B {
void operator delete(void *);
};
struct C : A, B {
virtual ~C();
};
As Richard points out, every virtual function declared in a TU
(including this virtual destructor) is odr-used, so it must be defined
in any program which declares it, or the program is ill formed, no
diagnostic required. Because we know that any definition of this
destructor will cause the lookup to fail, the compiler can choose to
issue a diagnostic here.
Reid Kleckner [Mon, 20 May 2013 14:02:37 +0000 (14:02 +0000)]
Implement __declspec(selectany) under -fms-extensions
selectany only applies to externally visible global variables. It has
the effect of making the data weak_odr.
The MSDN docs suggest that unused definitions can only be dropped at
linktime, so Clang uses weak instead of linkonce. MSVC optimizes away
references to constant selectany data, so it must assume that there is
only one definition, hence weak_odr.
This addresses one of the two issues identified in r181947, ensuring
that types imported via using declarations only result in a declaration
being emitted for the type, not a definition. The second issue (emitting
using declarations that are unused) is hopefully an acceptable increase
as the real fix for this would be a bit difficult (probably at best we
could record which using directives were involved in lookups - but may
not have been the result of the lookup).
This also ensures that DW_TAG_imported_declarations (& directives) are
not emitted in line-tables-only mode as well as ensuring that typedefs
only require/emit declarations (rather than definitions) for referenced
types.
Chandler Carruth [Sat, 18 May 2013 20:47:36 +0000 (20:47 +0000)]
Fix a logic bug in the handling of -fmath-errno in the driver. We would
imply -fno-math-errno if the user passed -fno-fast-math OR -ffast-math,
regardless of in which order and regardless of the tool chain default.
I've fixed this to follow the logic:
1) If the last dominating flag is -fno-math-errno, -ffast-math, or
-Ofast, then do not use math-errno.
2) If the last dominating flag is an explicit -fmath-errno, do use
math-errno.
3) Otherwise, use the toolchain default.
This, for example, allows the flag sequence
'-ffast-math ... -fno-fast-math' with no mention of '-fmath-errno' or
'-fno-math-errno' to preserve the toolchain default. Most notably, this
should prevent users trying to disable fast-math optimizations on Darwin
and BSD platforms from simultaneously enabling (pointless) -fmath-errno.
I've enhanced the tests (after more reorganization) to cover this and
other weird permutations of flags and targets.
Chandler Carruth [Sat, 18 May 2013 20:27:06 +0000 (20:27 +0000)]
Slight reorganization of the fast-math tests which test for errno
setting. Consolidate the collection of tests that enable -fmath-errno
and share a single CHECK line for simplicity.
Jordan Rose [Sat, 18 May 2013 02:27:09 +0000 (02:27 +0000)]
[analyzer] "Fix" ParentMap to handle non-syntactic OpaqueValueExprs.
Constructs like PseudoObjectExpr, where an expression can appear more than
once in the AST, use OpaqueValueExprs to guard against inadvertent
re-processing of the shared expression during AST traversal. The most
common form of this is to share expressions between the syntactic
"as-written" form of, say, an Objective-C property access 'obj.prop', and
the underlying "semantic" form '[obj prop]'.
However, some constructs can produce OpaqueValueExprs that don't appear in
the syntactic form at all; in these cases the ParentMap wasn't ever traversing
the children of these expressions. This patch fixes that by checking to see
if an OpaqueValueExpr's child has ever been traversed before. There's also a
bit of reset logic when visiting a PseudoObjectExpr to handle the case of
updating the ParentMap, which some external clients depend on.
This still isn't exactly the right fix because we probably want the parent
of the OpaqueValueExpr itself to be its location in the syntactic form if
it's syntactic and the PseudoObjectExpr or BinaryConditionalOperator itself
if it's semantic. Whe I originally wrote the code to do this, I didn't realize
that OpaqueValueExprs themselves are shared in the AST, not just their source
expressions. This patch doesn't change the existing behavior so as not to
break anything inadvertently relying on it; we'll come back to this later.
Jordan Rose [Sat, 18 May 2013 02:26:50 +0000 (02:26 +0000)]
Revert "[analyzer; alternate edges] improve support for edges with PseudoObjectExprs."
Ted and I spent a long time discussing this today and found out that neither
the existing code nor the new code was doing what either of us thought it
was, which is never good. The good news is we found a much simpler way to
fix the motivating test case (an ObjCSubscriptExpr).
This reverts r182083, but pieces of it will come back in subsequent commits.
Thread safety analysis: add two new attributes to the thread safety analysis:
assert_exclusive_lock and assert_shared_lock. These attributes are used to
mark functions that dynamically check (i.e. assert) that a lock is held.
Objective-C++ (and c++) Sema: Patch fixes a sema crash when gnu’s ?: extension
is used for Objective-C++’s dictionary subscripting. This is done by filtering
out all placeholder types before check on lowering of the
common expression is done. // rdar://1374918.
Reviewed by John McCall.
Ted Kremenek [Fri, 17 May 2013 09:41:40 +0000 (09:41 +0000)]
[analyzer; alternate edges] improve support for edges with PseudoObjectExprs.
This optimizes some spurious edges resulting from PseudoObjectExprs.
This required far more changes than I anticipated. The current
ParentMap does not record any hierarchy information between
a PseudoObjectExpr and its *semantic* expressions that may be
wrapped in OpaqueValueExprs, which are the expressions actually
laid out in the CFG. This means the arrow pruning logic could
not map from an expression to its containing PseudoObjectExprs.
To solve this, this patch adds a variant of ParentMap that
returns the "semantic" parentage of expressions (essentially
as they are viewed by the CFG). This alternate ParentMap is then
used by the arrow reducing logic to identify edges into pseudo
object expressions, and then eliminate them.
Daniel Jasper [Fri, 17 May 2013 09:35:01 +0000 (09:35 +0000)]
Slightly modify the formatting rules for braced lists.
Basically, the new rule is: The opening "{" always has to be on the
same line as the first element if the braced list is nested
(e.g. in another braced list or in a function).
The solution that clang-format produces almost always adheres to this
rule anyway and this makes clang-format significantly faster for larger
lists. Added a test cases for the only exception I could find
(which doesn't seem to be very important at first sight).
Ted Kremenek [Fri, 17 May 2013 06:48:22 +0000 (06:48 +0000)]
[analyzer; alternate edges] don't add an edge incoming from the start of a function
for a nested call. This matches what we do with the first stack frame.
Richard Smith [Fri, 17 May 2013 02:19:35 +0000 (02:19 +0000)]
PR15757: When we instantiate an inheriting constructor template, also
instantiate the inherited constructor template and mark that as the constructor
which the instantiated specialization is inheriting. This fixes a
crash-on-valid when trying to compute the exception specification of a
specialization of the inheriting constructor.
Jordan Rose [Fri, 17 May 2013 02:16:49 +0000 (02:16 +0000)]
[analyzer] Don't inline ~shared_ptr.
The analyzer can't see the reference count for shared_ptr, so it doesn't
know whether a given destruction is going to delete the referenced object.
This leads to spurious leak and use-after-free warnings.
For now, just ban destructors named '~shared_ptr', which catches
std::shared_ptr, std::tr1::shared_ptr, and boost::shared_ptr.
Anna Zaks [Thu, 16 May 2013 22:30:45 +0000 (22:30 +0000)]
[analyzer] Add an option to use the last location in the main source file as the report location.
Previously, we’ve used the last location of the analyzer issue path as the location of the
report. This might not provide the best user experience, when one analyzer a source
file and the issue appears in the header. Introduce an option to use the last location
of the path that is in the main source file as the report location.
New option can be enabled with -analyzer-config report-in-main-source-file=true.
Richard Smith [Thu, 16 May 2013 22:18:32 +0000 (22:18 +0000)]
Since we're counting number of steps, switch to turing machines which maximize
#steps not #1s, and use a more traditional step count where the 'halt' step is
not counted.
Objective-C arc: Diagnose when user attempts to
synthesize a property getter method that overrides
a method definition named 'retain' and the like.
Fixes // rdar://13885083
Daniel Jasper [Thu, 16 May 2013 10:40:07 +0000 (10:40 +0000)]
Add a more convenient interface to use clang-format.
It turns out that several implementations go through the trouble of
setting up a SourceManager and Lexer and abstracting this into a
function makes usage easier.
Also abstracts SourceManager-independent ranges out of
tooling::Refactoring and provides a convenience function to create them
from line ranges.
Clang has an issue between mingw/include/float.h and clang/Headers/float.h with cyclic include_next.
For now, it should work to suppress #include_next in clang/float.h with an explicit target.
(It may work with -U__MINGW32__, though.)
Richard Smith [Thu, 16 May 2013 06:20:58 +0000 (06:20 +0000)]
First pass of semantic analysis for init-captures: check the initializer, build
a FieldDecl from it, and propagate both into the closure type and the
LambdaExpr.
You can't do much useful with them yet -- you can't use them within the body
of the lambda, because we don't have a representation for "the this of the
lambda, not the this of the enclosing context". We also don't have support or a
representation for a nested capture of an init-capture yet, which was intended
to work despite not being allowed by the current standard wording.
Rafael Espindola [Thu, 16 May 2013 04:30:21 +0000 (04:30 +0000)]
Fix pr15930.
In the case of inline functions, we have to special case local types
when they are used as template arguments to make sure the template
instantiations are still uniqued in case the function itself is inlined.
Richard Trieu [Thu, 16 May 2013 01:46:09 +0000 (01:46 +0000)]
Return QualType() when a too large array is attempting to be created. This
prevents further errors and some overflows in size calculations.
One overflow was previously triggering an assert.
Richard Smith [Thu, 16 May 2013 01:23:30 +0000 (01:23 +0000)]
Start a page tracking which C++ defect reports have been implemented in Clang.
The page is generated from a text file listing DR numbers and implementation
status, plus a copy of the cwg_index.html from the WG21 website. Recipe:
The intent here is to go through all the DRs, add tests for each one, then mark
them as done once such tests are committed and passing. I've not linked to this
page from anywhere, since it doesn't contain any useful information yet.
Adrian Prantl [Thu, 16 May 2013 00:41:29 +0000 (00:41 +0000)]
Set the debug location for landing pad code to the canonical EH location.
It used to point to the first call that caused the landing pad to
be generated.
This seems to be emitting too much extra debug info for two (known)
reasons:
* full class definitions are emitted when only declarations are expected
* unused using declarations still produce DW_TAG_imported_declarations
Jordan Rose [Wed, 15 May 2013 23:22:55 +0000 (23:22 +0000)]
Remove unused, awkward CFGStmtVisitor and subclasses.
This class is a StmtVisitor that distinguishes between block-level and
non-block-level statements in a CFG. However, it does so using a hard-coded
idea of which statements might be block-level, which probably isn't accurate
anymore. The only implementer of the CFGStmtVisitor hierarchy was the
analyzer's DeadStoresChecker, and the analyzer creates a linearized CFG
anyway (every non-trivial statement is a block-level statement).
This also allows us to remove the block-expr map ("BlkExprMap"), which
mapped statements to positions in the CFG. Apart from having a helper type
that really should have just been Optional<unsigned>, it was only being
used to ask /if/ a particular expression was block-level, for traversal
purposes in CFGStmtVisitor.
Jordan Rose [Wed, 15 May 2013 18:08:15 +0000 (18:08 +0000)]
[analyzer] Put back DefaultBool's implicit conversion to bool.
DefaultBool is basically just "bool with a default constructor", so it
really should implicitly convert to bool. In fact, it should convert to
bool&, so that it could be passed to functions that take bools by reference.
This time, mark the operator bool& as implicit to promise that it's
deliberate.
Rationale:
a) Having anything other than forward declaration on the same line
as a namespace looks confusing.
b) Formatting namespace-forward-declaration-combinations different
from other stuff is inconsistent.
c) Wasting vertical space close to such forward declarations really
does not affect readability.
Hans Wennborg [Wed, 15 May 2013 11:03:04 +0000 (11:03 +0000)]
Better diagnostics for string initialization.
This commit improves Clang's diagnostics for string initialization.
Where it would previously say:
/tmp/a.c:3:9: error: array initializer must be an initializer list
wchar_t s[] = "Hi";
^
/tmp/a.c:4:6: error: array initializer must be an initializer list or string literal
char t[] = L"Hi";
^
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