Use nullptr to silence -Wsentinel when self-hosting on Windows

Richard rejected my Sema change to interpret an integer literal zero in
a varargs context as a null pointer, so -Wsentinel sees an integer
literal zero and fires off a warning. Only CodeGen currently knows that
it promotes integer literal zeroes in this context to pointer size on
Windows.  I didn't want to teach -Wsentinel about that compatibility
hack. Therefore, I'm migrating to C++11 nullptr.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223079 91177308-0d34-0410-b5e6-96231b3b80d8
Make -fuse-ld=lld work properly on Windows.

Using lld on Windows requires calling link-lld.exe instead of
lld.exe.  This patch puts this knowledge into clang so that when
using the GCC style clang driver, it can properly delegate to
lld.

Differential Revision: http://reviews.llvm.org/D6428
Reviewed by: Reid Kleckner, Rui Ueyama

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223086 91177308-0d34-0410-b5e6-96231b3b80d8
Perform correct lookup when '__super' is used in class with dependent base.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223090 91177308-0d34-0410-b5e6-96231b3b80d8
[modules] Track how 'header' directives were written in module map files,
rather than trying to extract this information from the FileEntry after the
fact.

This has a number of beneficial effects. For instance, diagnostic messages for
failed module builds give a path relative to the "module root" rather than an
absolute file path, and the contents of the module includes file is no longer
dependent on what files the including TU happened to inspect prior to
triggering the module build.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223095 91177308-0d34-0410-b5e6-96231b3b80d8
Remove special case for aarch64 static vs. PIC code in iOS kernel code.

I added this check a while back but then made a note to myself that it
should be completely unnecessary since iOS always uses PIC code-gen for
aarch64. Since I could never come up with any reason why it would be
necessary, I'm just going to remove it and we'll see if anything breaks.
rdar://problem/13627985

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223097 91177308-0d34-0410-b5e6-96231b3b80d8
Add a test that ensures the Clang driver behaves itself when the PATH
environment variable is changed to strange things out from under it.
Prior to r223099 in LLVM, these test cases would crash in various ways
(assert fails, stack exhaustion, etc.).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223100 91177308-0d34-0410-b5e6-96231b3b80d8
Rely on fewer features of the 'env' command. Darwin only supports '-i'.
I'm explicitly setting LC_ALL=C somewhat for documentation, but
hopefully this also removes some host variation from the test results.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223102 91177308-0d34-0410-b5e6-96231b3b80d8
Try to fix the MSVC build.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223105 91177308-0d34-0410-b5e6-96231b3b80d8
CMake: make the regexes used for setting HOST_LINK_VERSION more forgiving (PR21268)

If the output of 'ld -v' didn't match the regexes, CMake would previously error
with a message like:

  CMake Error at tools/clang/CMakeLists.txt:269 (string):
    string sub-command REGEX, mode REPLACE regex "[^0-9]*([0-9.]*).*" matched
    an empty string.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223106 91177308-0d34-0410-b5e6-96231b3b80d8
clang/test/Modules/malformed.cpp REQUIRES shell due to "cd".

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223107 91177308-0d34-0410-b5e6-96231b3b80d8
Re-apply "Revert r166370 and r166540 now that Xcode 4.6 has been available for a while."

This reverts commit r176892.

I had reverted this a while back to give Chromium more time to update, and
Nico says it should be OK now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223108 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format: precedence-based indentation when breaking before operators.

Before:
  bool value = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
               + aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
               + aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
               == aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                  * bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
                  + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
               && aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                  * aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                  > ccccccccccccccccccccccccccccccccccccccccc;

After:
  bool value = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                       + aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                       + aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                   == aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                              * bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
                          + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
               && aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                          * aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                      > ccccccccccccccccccccccccccccccccccccccccc;

Not particularly pretty, but can probably help to uncover bugs. And if this
bugs somebody, parentheses can help.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223111 91177308-0d34-0410-b5e6-96231b3b80d8
Emit warning if define or undef reserved identifier or keyword.

Summary:
This change implements warnings if macro name is identical to a keyword or
reserved identifier. The warnings are different depending on the "danger"
of the operation. Defining macro that replaces a keyword is on by default.
Other cases produce warning that is off by default but can be turned on
using option -Wreserved-id-macro.

This change fixes PR11488.

Reviewers: rnk

Reviewed By: rnk

Subscribers: rnk, cfe-commits

Differential Revision: http://reviews.llvm.org/D6194


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223114 91177308-0d34-0410-b5e6-96231b3b80d8
[NVPTX] Fix type error for some builtins in BuiltinsNVPTX.def

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223116 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format: Add option to suppress operator alignment.

With alignment:
  int aaaaaa = aa
               + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
                     * cccccccccccccccccccccccccccccccc;

Without alignment:
  int aaaaaa = aa
      + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
          * cccccccccccccccccccccccccccccccc;

This fixes llvm.org/PR21666.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223117 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format: Escape '*' in generated flag documentation.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223118 91177308-0d34-0410-b5e6-96231b3b80d8
Reverted r223114, it caused failure on on clang-native-arm-cortex-a9.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223120 91177308-0d34-0410-b5e6-96231b3b80d8
Fix invalid calling convention used for libcalls on ARM.
ARM ABI specifies that all the libcalls use soft FP ABI 
(even hard FP binaries). These days clang emits _mulsc3 / _muldc3
calls with default (C) calling convention which would be translated
into AAPCS_VFP LLVM calling and thus the result of complex
multiplication will be bogus.

Introduce a way for a target to specify explicitly calling
convention for libcalls. Right now this is temporary correctness
fix. Ultimately, we'll end with intrinsic for complex 
multiplication and all calling convention decisions for libcalls
will be put into backend.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223123 91177308-0d34-0410-b5e6-96231b3b80d8
Skip some unnecessary type checks.

Summary:
Skip some unnecessary type checks wrt DynTypedNodes.
Add DynTypedNode::getUnchecked() to skip the runtime check when the type
is known.
Speed up DynTypedNode::operator== by using isSame() instead of
isBaseOf().
Skip the type check in MatcherInterface<T>::matches(). All calls come
from DynTypedMatcher::matches(), which already did the type check.
This change speeds up our clang-tidy benchmark by ~4%.

Reviewers: klimek

Subscribers: klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D6468

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223134 91177308-0d34-0410-b5e6-96231b3b80d8
This patch fixes a crash involving use of predefined
expressions. It fixes crash when mangling name for block's helper
function used inside a constructor/destructor. 
rdar://19065361.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223136 91177308-0d34-0410-b5e6-96231b3b80d8