specifically checks for equality to null.

Enforcing this general practice, which keeps the analyzer less
noisy, in the CString Checker. This change suppresses "Assigned value is
garbage or undefined" warning in the added test case.

llvm-svn: 156085

failing to lex the string, as suggested by Eli.

Part of rdar://11305263.

llvm-svn: 156081

aren't necessary to reproduce the clang crash.
Part of rdar://11285725

llvm-svn: 156079

under -Wobjc-missing-property-synthesis which must be
opted-in. // rdar://11295716

llvm-svn: 156078

llvm-svn: 156074

[analyzer] Equality ops are like relational ops in that the arguments shouldn't be converted to the result type. Fixes PR12206 and dupe PR12510.

This was probably the original intent of r133041 (also me, a year ago).

llvm-svn: 156062

llvm-svn: 156058

Fixes rdar://11353109 & http://llvm.org/bugs/show_bug.cgi?id=12689

llvm-svn: 156056

We need to identify the value of ptr as
ElementRegion (result of pointer arithmetic) in the following code.
However, before this commit '(2-x)' evaluated to Unknown value, and as
the result, 'p + (2-x)' evaluated to Unknown value as well.

int *p = malloc(sizeof(int));
ptr = p + (2-x);

llvm-svn: 156052

The resulting type info is stored in the SymSymExpr, so no reason not to
support construction of expression with different subexpression types.

llvm-svn: 156051

(Currently, this is only relevant for tainted data.)

llvm-svn: 156050

The change resulted in multiple issues on the buildbot, so it's not
ready for prime time. Only enable history tracking for tainted
data(which is experimental) for now.

llvm-svn: 156049

#define TEST int y; int x = y;
void foo() {
  TEST
}

-Wuninitialized gives this warning:
invalid-loc.cc:4:3: warning: variable 'y' is uninitialized when used here
      [-Wuninitialized]
  TEST
  ^~~~
invalid-loc.cc:2:29: note: expanded from macro 'TEST'
#define TEST int y; int x = y;
                            ^
note: initialize the variable 'y' to silence this warning
1 warning generated.

The second note lacks filename, line number, and code snippet.  This change
will remove the fixit and only point to variable declaration.

invalid-loc.cc:4:3: warning: variable 'y' is uninitialized when used here
      [-Wuninitialized]
  TEST
  ^~~~
invalid-loc.cc:2:29: note: expanded from macro 'TEST'
#define TEST int y; int x = y;
                            ^
invalid-loc.cc:4:3: note: variable 'y' is declared here
  TEST
  ^
invalid-loc.cc:2:14: note: expanded from macro 'TEST'
#define TEST int y; int x = y;
             ^
1 warning generated.

llvm-svn: 156045

not as we expect; it may be due to racing issue of a file coming from PCH
changing after the PCH is loaded.

rdar://11353109

llvm-svn: 156043

for __NSContainer_literal.

llvm-svn: 156035

refactorings in that revision, and some of the subsequent bugfixes, which
seem to be relevant even without delayed exception specification parsing.

llvm-svn: 156031

llvm-svn: 156030

them, otherwise we cannot produce an error for both

struct HIDDEN test4; // canonical
struct test4;
struct DEFAULT test4;

and

struct test5; // canonical
struct HIDDEN test5;
struct DEFAULT test5;

llvm-svn: 156016

llvm-svn: 156005

related to laying out ivar structs and accessing non-fragile-ivar
in more compilated cases. // rdar://11323187

llvm-svn: 156004

TableGen-generated StringMatcher, for a 1.2% speedup in -fparse-only
time in <rdar://problem/11004361>. Thanks to Benjamin for pointing me
at StringMatcher!

llvm-svn: 156003

we accept are not modeled somehow via Attr.td.

llvm-svn: 155998

as an AST node, and fold a number of such attributes into Attr.td.

llvm-svn: 155995

and const (as "__const") using tblgen, rather than explicitly hacking
them in.

llvm-svn: 155991

Driver: Turn the default value for -fmath-errno into a proper target hook and disable it by default on more platforms.

For now -fno-math-errno is the default on BSD-derived platforms (Darwin,
DragonFlyBSD, FreeBSD, NetBSD, OpenBSD). If the default is not right for
your platform, please yell. I only verified the result with the default
compilers on Darwin and FreeBSD.

llvm-svn: 155990

Benjamin has suggested a better approach.

llvm-svn: 155989

we're looking at a normal token. Tiny positive impact -fsyntax-only
time for <rdar://problem/11004361>.

llvm-svn: 155988

IdentifierInfo *) with a static StringMap, improving -fsyntax-only
performance by 1% for the example in <rdar://problem/11004361>.

llvm-svn: 155987

-fpack-struct's handling has changed in CC1 (one of only two flags that needed changing) because the driver treats "-fpack-struct" as a boolean flag, and CC1 (did) treat it as an option with a separated value.

This change causes -fpack-struct=X to be forwarded correctly to -fpack-struct=X instead of erroneously to "-fpack-struct X"

llvm-svn: 155981

llvm-svn: 155977

the parsing of such things appears to be a conforming extension, but it breaks
libstdc++4.7's std::pair.

llvm-svn: 155975

Really just a wild stab in the dark.

llvm-svn: 155974

Refine analyzer diagnostics by adding an expression "cone-of-influence" to reverse track interesting
values through interesting expressions.  This allows us to map from interesting values in a caller
to interesting values in a caller, thus recovering some precision in diagnostics lost from IPA.

Fixes <rdar://problem/11327497>

llvm-svn: 155971

warning.

llvm-svn: 155966

of giving unhelpful errors about undeclared identifers and missing semicolons.

llvm-svn: 155965

llvm-svn: 155964

llvm-svn: 155963

folding its one check into the normal path for checking overridden
Objective-C methods. Good for another 3.6% speedup on the test case in
<rdar://problem/11004361>.

llvm-svn: 155961

declared in a subclass has consistent parameter types with a method
having the same selector in a superclass performs a significant number
of lookups into the class hierarchy. In the example in
<rdar://problem/11004361>, we spend 4.7% of -fsyntax-only time in
these lookups.

Optimize away most of the calls to this routine
(Sema::CompareMethodParamsInBaseAndSuper) by first checking whether we
have ever seen *any* method with that selector (using the global
selector table). Since most selectors are unique, we can avoid the
cost of this name lookup in many cases, for a 3.3% speedup.

llvm-svn: 155958

While I'm here, fix source locations for other diagnostics related to property synthesis.

llvm-svn: 155953