From 98eb348eb38aaba63aa149000c97d27a7e5190c3 Mon Sep 17 00:00:00 2001
From: David Spickett <david.spickett@linaro.org>
Date: Fri, 13 Aug 2021 16:25:32 +0100
Subject: [PATCH] Revert "[clang-format] Distinguish K&R C function definition
 and attribute"

This reverts commit de763c4037157e60551ba227ccd0ed02e109c317.

Causing test failures on the Arm/AArch64 quick bots:
https://lab.llvm.org/buildbot/#/builders/188/builds/2202
---
 clang/lib/Format/UnwrappedLineParser.cpp | 25 ++++++++-----------------
 clang/unittests/Format/FormatTest.cpp    | 10 ----------
 2 files changed, 8 insertions(+), 27 deletions(-)

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index e234c74..0c4caca 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -14,6 +14,7 @@
 
 #include "UnwrappedLineParser.h"
 #include "FormatToken.h"
+#include "clang/Basic/TokenKinds.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
@@ -994,13 +995,6 @@ static bool isJSDeclOrStmt(const AdditionalKeywords &Keywords,
       Keywords.kw_import, tok::kw_export);
 }
 
-// Checks whether a token is a type in K&R C (aka C78).
-static bool isC78Type(const FormatToken &Tok) {
-  return Tok.isOneOf(tok::kw_char, tok::kw_short, tok::kw_int, tok::kw_long,
-                     tok::kw_unsigned, tok::kw_float, tok::kw_double,
-                     tok::identifier);
-}
-
 // This function checks whether a token starts the first parameter declaration
 // in a K&R C (aka C78) function definition, e.g.:
 //   int f(a, b)
@@ -1012,8 +1006,9 @@ static bool isC78ParameterDecl(const FormatToken *Tok) {
   if (!Tok)
     return false;
 
-  if (!isC78Type(*Tok) &&
-      !Tok->isOneOf(tok::kw_register, tok::kw_struct, tok::kw_union))
+  if (!Tok->isOneOf(tok::kw_int, tok::kw_char, tok::kw_float, tok::kw_double,
+                    tok::kw_struct, tok::kw_union, tok::kw_long, tok::kw_short,
+                    tok::kw_unsigned, tok::kw_register))
     return false;
 
   Tok = Tok->Previous;
@@ -1374,7 +1369,7 @@ void UnwrappedLineParser::parseStructuralElement(bool IsTopLevel) {
     case tok::r_brace:
       addUnwrappedLine();
       return;
-    case tok::l_paren: {
+    case tok::l_paren:
       parseParens();
       // Break the unwrapped line if a K&R C function definition has a parameter
       // declaration.
@@ -1382,18 +1377,14 @@ void UnwrappedLineParser::parseStructuralElement(bool IsTopLevel) {
         break;
       if (!Previous || Previous->isNot(tok::identifier))
         break;
-      const FormatToken *PrevPrev = Previous->Previous;
-      if (!PrevPrev || (!isC78Type(*PrevPrev) && PrevPrev->isNot(tok::star)))
+      if (Previous->Previous && Previous->Previous->is(tok::at))
         break;
-      const FormatToken *Next = AllTokens[Tokens->getPosition() + 1];
-      if (Next && Next->isOneOf(tok::l_paren, tok::semi))
-        break;
-      if (isC78ParameterDecl(FormatTok)) {
+      if (!Line->Tokens.begin()->Tok->is(tok::kw_typedef) &&
+          isC78ParameterDecl(FormatTok)) {
         addUnwrappedLine();
         return;
       }
       break;
-    }
     case tok::kw_operator:
       nextToken();
       if (FormatTok->isBinaryOperator())
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 63e93b7..1283aa6 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -8247,16 +8247,6 @@ TEST_F(FormatTest, ReturnTypeBreakingStyle) {
                "  return a + b < c;\n"
                "};",
                Style);
-  verifyFormat("byte *\n" // Break here.
-               "f(a)\n"   // Break here.
-               "byte a[];\n"
-               "{\n"
-               "  return a;\n"
-               "}",
-               Style);
-  verifyFormat("bool f(int a, int) override;\n"
-               "Bar g(int a, Bar) final; // comment",
-               Style);
 
   // The return breaking style doesn't affect:
   // * function and object definitions with attribute-like macros
-- 
2.7.4