Special detail is added for uninitialized variable analysis as this has
serious performance problems than need to be tracked.

Computing some of this data is expensive, for example walking the CFG to
determine its size. To avoid doing that unless the stats data is going
to be used, we thread a bit into the Sema object to track whether
detailed stats should be collected or not. This bit is used to avoid
computations whereever the computations are likely to be more expensive
than checking the state of the flag. Thus, counters are in some cases
unconditionally updated, but the more expensive (and less frequent)
aggregation steps are skipped.

With this patch, we're able to see that for 'gcc.c':
*** Analysis Based Warnings Stats:
232 functions analyzed (0 w/o CFGs).
  7151 CFG blocks built.
  30 average CFG blocks per function.
  1167 max CFG blocks per function.
163 functions analyzed for uninitialiazed variables
  640 variables analyzed.
  3 average variables per function.
  94 max variables per function.
  96409 block visits.
  591 average block visits per function.
  61546 max block visits per function.

And for the reduced testcase in PR10183:
*** Analysis Based Warnings Stats:
98 functions analyzed (0 w/o CFGs).
  8526 CFG blocks built.
  87 average CFG blocks per function.
  7277 max CFG blocks per function.
68 functions analyzed for uninitialiazed variables
  1359 variables analyzed.
  19 average variables per function.
  1196 max variables per function.
  2540494 block visits.
  37360 average block visits per function.
  2536495 max block visits per function.

That last number is the somewhat scary one that indicates the problem in
PR10183.

llvm-svn: 134494

obey the objc_method_family attribute when provided. Fixes
<rdar://problem/9726279>.

llvm-svn: 134493

instantiating functions.

Fixes PR10272.

llvm-svn: 134491

llvm-svn: 134490

variadic argument pack expansions as having changed, rather than doing
it for each changed expansion, which leaves out zero-argument packs
with catastrophic consequences.

Fixes PR10260.

llvm-svn: 134483

as scope specifiers;  diagnose the attempt, rather than letting it go
to an assert.  The rest of PR10264.

llvm-svn: 134479

of an enum specifier in dialects which permit fixed underlying types.
Fixes the rejects-valid part of PR10264.

llvm-svn: 134468

Bendersky. Specifically: 

* Implemented a new function in libclang: clang_isAttribute

* Fixing TranslationUnit.get_includes to only go through the argument
* buffer when it contains something. This fixed a crash on Windows 

* clang_getFileName returns CXString, not char*. Made appropriate
* fixes in cindex.py - now the relevant tests pass and we can see the
* full locations correctly again (previously there was garbage in
* place of the file name) 
* Exposed clang_getCursorDisplayName to the python bindings

llvm-svn: 134460

Restore it.

llvm-svn: 134459

exception in Objective-C;  in Objective-C++ we still use std::terminate().
This is only available in very recent runtimes.

llvm-svn: 134456

llvm-svn: 134455

llvm-svn: 134454

structure to hold inferred information, then propagate each invididual
bit down to -cc1.  Separate the bits of "supports weak" and "has a native
ARC runtime";  make the latter a CodeGenOption.

The tool chain is still driving this decision, because it's the place that
has the required deployment target information on Darwin, but at least it's
better-factored now.

llvm-svn: 134453

passed to it, and unknown selectors causing potential leak.
// rdar://9659270

llvm-svn: 134449

hardwired into the default pass list.

llvm-svn: 134445

llvm-svn: 134443

llvm-svn: 134442

llvm-svn: 134438

instantiated function template was written with a prototype or via
some kind of typedef. Fixes PR10273 / <rdar://problem/9723679>. 

llvm-svn: 134426

llvm-svn: 134425

llvm-svn: 134422

llvm-svn: 134419

llvm-svn: 134418

repetition and better reflect the actual grammar, from John Freeman!

llvm-svn: 134417

ActOnDeclarator can return NULL. Fixes PR10270, from Hans Wennborg!

llvm-svn: 134416

Patch by Jean-Daniel Dupas.

llvm-svn: 134414

llvm-svn: 134411

llvm-svn: 134410

Teach Clang's <float.h> to also include MinGW's <float.h>, which provides additional system definitions, from Ruben Van Boxem

llvm-svn: 134407

llvm-svn: 134406

Tested by valgrind & Sema/asm.c.

llvm-svn: 134404

llvm-svn: 134403

llvm-svn: 134399

llvm-svn: 134393

llvm-svn: 134392

llvm-svn: 134377

fprintf, and to be more consistent in formatting with the other stats
printing routines.

llvm-svn: 134374

fprintf. There is more cleanup to be done to the AST stats printing...

llvm-svn: 134373

llvm-svn: 134361

llvm-svn: 134320