[clang][analyzer] Move StreamChecker out of the alpha package. (#89247)

[clang][analyzer] Add "pedantic" mode to StreamChecker. (#87322)

The checker may create failure branches for all stream write operations
only if the new option "pedantic" is set to true.
Result of

[clang][analyzer] Add "pedantic" mode to StreamChecker. (#87322)

The checker may create failure branches for all stream write operations
only if the new option "pedantic" is set to true.
Result of the write operations is often not checked in typical code. If
failure branches are created the checker will warn for unchecked write
operations and generate a lot of "false positives" (these are valid
warnings but the programmer does not care about this problem).

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[clang][analyzer] Support 'fdopen' in the StreamChecker (#76776)

[clang][analyzer] Move checker alpha.unix.StdCLibraryFunctions out of alpha. (#66207)

[clang][analyzer] Add report of NULL stream to StreamChecker.

The report of NULL stream was removed in commit 570bf97.
The old reason is not actual any more because the checker dependencies are chan

[clang][analyzer] Add report of NULL stream to StreamChecker.

The report of NULL stream was removed in commit 570bf97.
The old reason is not actual any more because the checker dependencies are changed.
It is not good to eliminate a failure state (where the stream is NULL) without
generating a bug report because other checkers are not able to find it later.
The checker did this with the NULL stream pointer, and because this checker
runs now before other checkers that can detect NULL pointers, the null pointer
bug was not found at all.

Reviewed By: steakhal

Differential Revision: https://reviews.llvm.org/D152169

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[clang][analyzer] Merge apiModeling.StdCLibraryFunctions and StdCLibraryFunctionArgs checkers into one.

Main reason for this change is that these checkers were implemented in the same class
but had

[clang][analyzer] Merge apiModeling.StdCLibraryFunctions and StdCLibraryFunctionArgs checkers into one.

Main reason for this change is that these checkers were implemented in the same class
but had different dependency ordering. (NonNullParamChecker should run before StdCLibraryFunctionArgs
to get more special warning about null arguments, but the apiModeling.StdCLibraryFunctions was a modeling
checker that should run before other non-modeling checkers. The modeling checker changes state in a way
that makes it impossible to detect a null argument by NonNullParamChecker.)
To make it more simple, the modeling part is removed as separate checker and can be only used if
checker StdCLibraryFunctions is turned on, that produces the warnings too. Modeling the functions
without bug detection (for invalid argument) is not possible. The modeling of standard functions
does not happen by default from this change on.

Reviewed By: Szelethus

Differential Revision: https://reviews.llvm.org/D151225

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[clang][analyzer] Improve bug reports of StdLibraryFunctionsChecker.

Add an additional explanation of what is wrong if a constraint is
not satisfied, in some cases.
Additionally the bug report gener

[clang][analyzer] Improve bug reports of StdLibraryFunctionsChecker.

Add an additional explanation of what is wrong if a constraint is
not satisfied, in some cases.
Additionally the bug report generation is changed to use raw_ostream.

Reviewed By: Szelethus, NoQ

Differential Revision: https://reviews.llvm.org/D144003

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[clang][analyzer] Make messages of StdCLibraryFunctionsChecker user-friendly

Warnings and notes of checker alpha.unix.StdLibraryFunctionArgs are
improved. Previously one warning and one note was emi

[clang][analyzer] Make messages of StdCLibraryFunctionsChecker user-friendly

Warnings and notes of checker alpha.unix.StdLibraryFunctionArgs are
improved. Previously one warning and one note was emitted for every
finding, now one warning is emitted only that contains a detailed
description of the found issue.

Reviewed By: Szelethus

Differential Revision: https://reviews.llvm.org/D143194

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[clang][analyzer] Remove report of null stream from StreamChecker.

The case of NULL stream passed to stream functions was reported by StreamChecker.
The same condition is checked already by StdLibra

[clang][analyzer] Remove report of null stream from StreamChecker.

The case of NULL stream passed to stream functions was reported by StreamChecker.
The same condition is checked already by StdLibraryFunctionsChecker and it is
enough to check at one place. The StreamChecker stops now analysis if a passed NULL
stream is encountered but generates no report.
This change removes a dependency between StdCLibraryFunctionArgs checker and
StreamChecker. There is now no more specific message reported by StreamChecker,
the previous weak-dependency is not needed. And StreamChecker can be used
without StdCLibraryFunctions checker or its ModelPOSIX option.

Reviewed By: Szelethus

Differential Revision: https://reviews.llvm.org/D137790

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