Fix clang -Wimplicit-fallthrough warnings across llvm, NFC
This patch should not introduce any behavior changes. It consists of
mostly one of two changes:
1. Replacing fall through comments with the LLVM_FALLTHROUGH macro
2. Inserting 'break' before falling through into a case block consisting
of only 'break'.
We were already using this warning with GCC, but its warning behaves
slightly differently. In this patch, the following differences are
relevant:
1. GCC recognizes comments that say "fall through" as annotations, clang
doesn't
2. GCC doesn't warn on "case N: foo(); default: break;", clang does
3. GCC doesn't warn when the case contains a switch, but falls through
the outer case.
I will enable the warning separately in a follow-up patch so that it can
be cleanly reverted if necessary.
Reviewers: alexfh, rsmith, lattner, rtrieu, EricWF, bollu
Differential Revision: https://reviews.llvm.org/D53950
llvm-svn: 345882
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index af7bbfc..af6214c 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -4661,7 +4661,7 @@
case tok::identifier: // foo::bar
if (TryAltiVecVectorToken())
return true;
- // Fall through.
+ LLVM_FALLTHROUGH;
case tok::kw_typename: // typename T::type
// Annotate typenames and C++ scope specifiers. If we get one, just
// recurse to handle whatever we get.
@@ -4795,7 +4795,7 @@
return false;
if (TryAltiVecVectorToken())
return true;
- // Fall through.
+ LLVM_FALLTHROUGH;
case tok::kw_decltype: // decltype(T())::type
case tok::kw_typename: // typename T::type
// Annotate typenames and C++ scope specifiers. If we get one, just