building module 'Foo' imported from..." notes (the same we we provide
"In file included from..." notes) in the diagnostic, so that we know
how this module got included in the first place. This is part of
<rdar://problem/12696425>.


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working with preprocessed testcases. This causes source locations in
diagnostics to point at the spelling location instead of the presumed location,
while still keeping the semantic effects of the line directives (entering and
leaving system-header mode, primarily).


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for completeness and use it in CompilerInstance::InitializeSourceManager if
the input is a memory buffer.

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macro expansion ranges, make sure to check all the FileID
entries that are contained in the spelling range of the
expansion for the macro argument.

Fixes rdar://12537982

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as "volatile", meaning there's a high enough chance that they may
change while we are trying to use them.

This flag is only enabled by libclang.
Currently "volatile" source files will be stat'ed immediately
before opening them, because the file size stat info
may not be accurate since when we got it (e.g. from the PCH).
This avoids crashes when trying to reference mmap'ed memory
from a file whose size is not what we expect.

Note that there's still a window for a racing issue to occur
but the window for it should be way smaller than before.
We can consider later on to avoid mmap completely on such files.

rdar://11612916

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// expected-warning@10 {{some text}}

The line number may be absolute (as above), or relative to the current
line by prefixing the number with either '+' or '-'.

Patch by Andy Gibbs!

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* Primarily, added \brief to most of include/clang/Basic, instead of prefixing
  the comments with "DeclaredName - ";
* Made some brief summaries significantly briefer;
* Fixed up some erroneous uses of \see and \arg;
* Fixed up some extraneous backslashes in \code...\endcode blocks;
* Fixed up some typos/spelling errors.


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\file and \brief markup and appear in Doxygen's summaries (and eventually at
http://clang.llvm.org/doxygen/files.html).  Fixed up another couple of minor
glitches in the docs at the same time.


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* Many fixes for \brief summaries (adding some, and making others shorter);
* Don't try to explicit tell Doxygen a namespace name (and particularly
  don't get it wrong);
* Typo fix: instantitions -> instantiations;
* Slightly more use of \pre for documenting preconditions.


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* Retain comments in the AST
* Serialize/deserialize comments
* Find comments attached to a certain Decl
* Expose raw comment text and SourceRange via libclang


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r158085 added some logic to track predefined declarations.  The main reason we
had predefined declarations in the input was because the __builtin_va_list
declarations were injected into the preprocessor input.  As of r158592 we 
explicitly build the __builtin_va_list declarations.  Therefore the predefined
decl tracking is no longer needed.


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This simplifies the code a little bit, since these functions all took a
SourceManager parameter and called a bunch of methods on it, and makes
the functions available to other users.

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* Escaped # characters in Doxygen comments;
* Added Doxygen markup (\brief, \code, \file, \namespace).


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This reduces the number of warnings generated by Doxygen by about 100
(roughly 10%).  Issues addressed:
(1) Primarily, backslash-escaped "@foo" and "#bah" in Doxygen comments
when they're not supposed to be Doxygen commands or links, and
similarly for "<baz>" when it's not intended as as HTML tag;
(2) Changed some \t commands (which don't exist) to \c ("to refer to a
word of code", as the Doxygen manual says);
(3) \precondition becomes \pre;
(4) When touching comments, deleted a couple of spurious spaces in them;
(5) Changed some \n and \r to \\n and \\r;
(6) Fixed one tiny typo: #pragms -> #pragma.

This patch touches documentation/comments only.



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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.

PR12665 and <rdar://problem/9165548>

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validate that we didn't override the contents of any of such files.

If this is detected, emit a diagnostic error and recover gracefully
by using the contents of the original file that the PCH was built from.

Part of rdar://11305263

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from the one stored in the PCH/AST, while trying to load a SLocEntry.

We verify that all files of the PCH did not change before loading it but this is not enough because:

- The AST may have been 1) kept around, 2) to do queries on it.
- We may have 1) verified the PCH and 2) started parsing.

Between 1) and 2) files may change and we are going to have crashes because the rest of clang
cannot deal with the ASTReader failing to read a SLocEntry.

Handle this by recovering gracefully in such a case, by initializing the SLocEntry
with the info from the PCH/AST as well as reporting failure by the ASTReader.

rdar://10888929

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The class name is long enough without the llvm:: added.
Also bring in RefCountedBase and RefCountedBaseVPTR.

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single attribute ("system") that allows us to mark a module as being a
"system" module. Each of the headers that makes up a system module is
considered to be a system header, so that we (for example) suppress
warnings there.

If a module is being inferred for a framework, and that framework
directory is within a system frameworks directory, infer it as a
system framework.


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Along the way, move a helper function from SemaChecking.cpp to a more
accessible home in SourceManager.

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as suggested by Tom Honermann.

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to make sure we do not crash. rdar://10594186

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token locations as coming before the closing ')' of a function macro expansion.

Include a unit test for SourceManager.

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constructors go below public member functions?


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file in the source manager. This allows us to properly create and use
modules described by module map files without umbrella headers (or
with incompletely umbrella headers). More generally, we can actually
build a PCH file that makes use of  file -> buffer remappings, which
could be useful in libclang in the future.


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Useful to set up a virtual include hierarchy, e.g. to order diagnostics for ambiguous overloads from MemoryBuffers.


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preprocessed entities that are #included in the range that we are interested.

This is useful when we are interested in preprocessed entities of a specific file, e.g
when we are annotating tokens. There is also an optimization where we cache the last
result of PreprocessingRecord::getPreprocessedEntitiesInRange and we re-use it if
there is a call with the same range as before.

rdar://10313365

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Fix all 80 col violations in include/clang/Basic, plus any trailing whitespace in the files I'm touching anyway.


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taking into account macro arguments.

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of a ContentCache, since multiple FileIDs can have the same ContentCache
but the expanded macro arguments locations will be different.

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