Author: owenca
Date: 2025-08-17T12:54:23-07:00
New Revision: 5e57a10f502c8fc524bd119a53ddbf643686c7a0

URL: 
https://github.com/llvm/llvm-project/commit/5e57a10f502c8fc524bd119a53ddbf643686c7a0
DIFF: 
https://github.com/llvm/llvm-project/commit/5e57a10f502c8fc524bd119a53ddbf643686c7a0.diff

LOG: [clang-format] Allow breaking before bit-field colons (#153529)

Fixes #153448

Added: 
    

Modified: 
    clang/lib/Format/TokenAnnotator.cpp
    clang/unittests/Format/FormatTest.cpp

Removed: 
    


################################################################################
diff  --git a/clang/lib/Format/TokenAnnotator.cpp 
b/clang/lib/Format/TokenAnnotator.cpp
index 88752903914bf..4be3bfbf41b4e 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -6272,7 +6272,8 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine 
&Line,
   }
 
   if (Right.is(tok::colon) &&
-      !Right.isOneOf(TT_CtorInitializerColon, TT_InlineASMColon)) {
+      !Right.isOneOf(TT_CtorInitializerColon, TT_InlineASMColon,
+                     TT_BitFieldColon)) {
     return false;
   }
   if (Left.is(tok::colon) && Left.isOneOf(TT_DictLiteral, TT_ObjCMethodExpr)) {

diff  --git a/clang/unittests/Format/FormatTest.cpp 
b/clang/unittests/Format/FormatTest.cpp
index 96cc650f52a5d..6fc008f029b48 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -4050,6 +4050,10 @@ TEST_F(FormatTest, FormatsBitfields) {
                "  uchar : 8;\n"
                "  uchar other;\n"
                "};");
+  verifyFormat("struct foo {\n"
+               "  uint8_t i_am_a_bit_field_this_long\n"
+               "      : struct_with_constexpr::i_am_a_constexpr_lengthhhhh;\n"
+               "};");
   FormatStyle Style = getLLVMStyle();
   Style.BitFieldColonSpacing = FormatStyle::BFCS_None;
   verifyFormat("struct Bitfields {\n"


        
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