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# 4f902c7e 08-Mar-2016 Richard Smith <[email protected]>

P0188R1: add support for standard [[fallthrough]] attribute. This is almost
exactly the same as clang's existing [[clang::fallthrough]] attribute, which
has been updated to have the same semantics. T

P0188R1: add support for standard [[fallthrough]] attribute. This is almost
exactly the same as clang's existing [[clang::fallthrough]] attribute, which
has been updated to have the same semantics. The one significant difference
is that [[fallthrough]] is ill-formed if it's not used immediately before a
switch label (even when -Wimplicit-fallthrough is disabled). To support that,
we now build a CFG of any function that uses a '[[fallthrough]];' statement
to check.

In passing, fix some bugs with our support for statement attributes -- in
particular, diagnose their use on declarations, rather than asserting.

llvm-svn: 262881

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Revision tags: llvmorg-3.8.0, llvmorg-3.8.0-rc3, llvmorg-3.8.0-rc2, llvmorg-3.8.0-rc1, llvmorg-3.7.1, llvmorg-3.7.1-rc2, llvmorg-3.7.1-rc1, llvmorg-3.7.0, llvmorg-3.7.0-rc4, llvmorg-3.7.0-rc3, llvmorg-3.7.0-rc2, llvmorg-3.7.0-rc1, llvmorg-3.6.2, llvmorg-3.6.2-rc1, llvmorg-3.6.1, llvmorg-3.6.1-rc1, llvmorg-3.5.2, llvmorg-3.5.2-rc1, llvmorg-3.6.0, llvmorg-3.6.0-rc4, llvmorg-3.6.0-rc3, llvmorg-3.6.0-rc2, llvmorg-3.6.0-rc1, llvmorg-3.5.1, llvmorg-3.5.1-rc2, llvmorg-3.5.1-rc1, llvmorg-3.5.0, llvmorg-3.5.0-rc4, llvmorg-3.5.0-rc3, llvmorg-3.5.0-rc2, llvmorg-3.5.0-rc1, llvmorg-3.4.2, llvmorg-3.4.2-rc1, llvmorg-3.4.1, llvmorg-3.4.1-rc2, llvmorg-3.4.1-rc1, llvmorg-3.4.0, llvmorg-3.4.0-rc3, llvmorg-3.4.0-rc2, llvmorg-3.4.0-rc1, llvmorg-3.3.1-rc1, llvmorg-3.3.0, llvmorg-3.3.0-rc3, llvmorg-3.3.0-rc2, llvmorg-3.3.0-rc1, llvmorg-3.2.0, llvmorg-3.2.0-rc3, llvmorg-3.2.0-rc2, llvmorg-3.2.0-rc1
# e61e5625 28-Sep-2012 Alexander Kornienko <[email protected]>

Compatibility macro detection for the -Wimplicit-fallthrough diagnostic.

Summary:
When issuing a diagnostic message for the -Wimplicit-fallthrough diagnostics, always try to find the latest macro, d

Compatibility macro detection for the -Wimplicit-fallthrough diagnostic.

Summary:
When issuing a diagnostic message for the -Wimplicit-fallthrough diagnostics, always try to find the latest macro, defined at the point of fallthrough, which is immediately expanded to "[[clang::fallthrough]]", and use it's name instead of the actual sequence.

Known issues:
* uses PP.getSpelling() to compare macro definition with a string (anyone can suggest a convenient way to fill a token array, or maybe lex it in runtime?);
* this can be generalized and used in other similar cases, any ideas where it should reside then?

Reviewers: doug.gregor, rsmith

Reviewed By: rsmith

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D50

llvm-svn: 164858

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