[clang-format] Do not insert space after new/delete keywords in C function declarations

Fixes llvm#46915.

Reviewed By: curdeius, HazardyKnusperkeks

Differential Revision: https://reviews.llvm.org/D120374

Author: penagos

clang/lib/Format/TokenAnnotator.cpp

@@ -3299,11 +3299,15 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
       if (Left.isOneOf(tok::kw_try, Keywords.kw___except, tok::kw_catch))
         return Style.SpaceBeforeParensOptions.AfterControlStatements ||
                spaceRequiredBeforeParens(Right);
-      if (Left.isOneOf(tok::kw_new, tok::kw_delete) ||
-          (Left.is(tok::r_square) && Left.MatchingParen &&
-           Left.MatchingParen->Previous &&
-           Left.MatchingParen->Previous->is(tok::kw_delete)))
-        return Style.SpaceBeforeParens != FormatStyle::SBPO_Never ||
+      if (Left.isOneOf(tok::kw_new, tok::kw_delete))
+        return ((!Line.MightBeFunctionDecl || !Left.Previous) &&
+                Style.SpaceBeforeParens != FormatStyle::SBPO_Never) ||
+               spaceRequiredBeforeParens(Right);
+
+      if (Left.is(tok::r_square) && Left.MatchingParen &&
+          Left.MatchingParen->Previous &&
+          Left.MatchingParen->Previous->is(tok::kw_delete))
+        return (Style.SpaceBeforeParens != FormatStyle::SBPO_Never) ||
                spaceRequiredBeforeParens(Right);
     }
     if (Line.Type != LT_PreprocessorDirective &&

clang/unittests/Format/FormatTest.cpp

@@ -9919,6 +9919,11 @@ TEST_F(FormatTest, UnderstandsNewAndDelete) {
   verifyFormat("void operator new(void *foo) ATTRIB;");
   verifyFormat("void operator delete[](void *foo) ATTRIB;");
   verifyFormat("void operator delete(void *ptr) noexcept;");
+
+  EXPECT_EQ("void new(link p);\n"
+            "void delete(link p);\n",
+            format("void new (link p);\n"
+                   "void delete (link p);\n"));
 }
 
 TEST_F(FormatTest, UnderstandsUsesOfStarAndAmp) {