Fixes various bugs around the keywords class, struct and union.

This switches to parsing record definitions only if we can clearly
identify them. We're specifically allowing common patterns for
visibility control through macros and attributes, but we cannot
currently fix all instances. This fixes all known bugs we have though.

Before:
static class A f() {
  return g();
} int x;

After:
static class A f() {
  return g();
}
int x;

llvm-svn: 172530

3 files changed, 54 insertions, 24 deletions

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index b3671b30409..fe522ac9d8f 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -320,8 +320,10 @@ void UnwrappedLineParser::parseStructuralElement() {
     case tok::kw_struct: // fallthrough
     case tok::kw_union:  // fallthrough
     case tok::kw_class:
-      parseStructClassOrBracedList();
-      return;
+      parseRecord();
+      // A record declaration or definition is always the start of a structural
+      // element.
+      break;
     case tok::semi:
       nextToken();
       addUnwrappedLine();
@@ -569,30 +571,29 @@ void UnwrappedLineParser::parseEnum() {
   } while (!eof());
 }
 
-void UnwrappedLineParser::parseStructClassOrBracedList() {
+void UnwrappedLineParser::parseRecord() {
   nextToken();
-  do {
-    switch (FormatTok.Tok.getKind()) {
-    case tok::l_brace:
-      // FIXME: Think about how to resolve the error handling here.
-      parseBlock();
-      parseStructuralElement();
-      return;
-    case tok::semi:
-      nextToken();
-      addUnwrappedLine();
-      return;
-    case tok::equal:
+  if (FormatTok.Tok.is(tok::identifier) ||
+      FormatTok.Tok.is(tok::kw___attribute) ||
+      FormatTok.Tok.is(tok::kw___declspec)) {
+    nextToken();
+    // We can have macros or attributes in between 'class' and the class name.
+    if (FormatTok.Tok.is(tok::l_paren)) {
+      parseParens();
+    }
+    if (FormatTok.Tok.is(tok::identifier))
       nextToken();
-      if (FormatTok.Tok.is(tok::l_brace)) {
-        parseBracedList();
+
+    if (FormatTok.Tok.is(tok::colon)) {
+      while (FormatTok.Tok.isNot(tok::l_brace)) {
+        if (FormatTok.Tok.is(tok::semi))
+          return;
+        nextToken();
       }
-      break;
-    default:
-      nextToken();
-      break;
     }
-  } while (!eof());
+  }
+  if (FormatTok.Tok.is(tok::l_brace))
+    parseBlock();
 }
 
 void UnwrappedLineParser::parseObjCProtocolList() {
diff --git a/clang/lib/Format/UnwrappedLineParser.h b/clang/lib/Format/UnwrappedLineParser.h
index 487e7019f7a..08faff15af1 100644
--- a/clang/lib/Format/UnwrappedLineParser.h
+++ b/clang/lib/Format/UnwrappedLineParser.h
@@ -146,7 +146,7 @@ private:
   void parseNamespace();
   void parseAccessSpecifier();
   void parseEnum();
-  void parseStructClassOrBracedList();
+  void parseRecord();
   void parseObjCProtocolList();
   void parseObjCUntilAtEnd();
   void parseObjCInterfaceOrImplementation();
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index f8a81b59820..e9fa666f907 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -1290,8 +1290,37 @@ TEST_F(FormatTest, PullTrivialFunctionDefinitionsIntoSingleLine) {
                "}");
 }
 
-TEST_F(FormatTest, BracedInitListWithElaboratedTypeSpecifier) {
+TEST_F(FormatTest, UnderstandContextOfRecordTypeKeywords) {
+  // Elaborate type variable declarations.
   verifyFormat("struct foo a = { bar };\nint n;");
+  verifyFormat("class foo a = { bar };\nint n;");
+  verifyFormat("union foo a = { bar };\nint n;");
+
+  // Elaborate types inside function definitions.
+  verifyFormat("struct foo f() {}\nint n;");
+  verifyFormat("class foo f() {}\nint n;");
+  verifyFormat("union foo f() {}\nint n;");
+
+  // Templates.
+  verifyFormat("template <class X> void f() {}\nint n;");
+  verifyFormat("template <struct X> void f() {}\nint n;");
+  verifyFormat("template <union X> void f() {}\nint n;");
+
+  // Actual definitions...
+  verifyFormat("struct {} n;");
+  verifyFormat("template <template <class T, class Y>, class Z > class X {} n;");
+  verifyFormat("union Z {\n  int n;\n} x;");
+  verifyFormat("class MACRO Z {} n;");
+  verifyFormat("class MACRO(X) Z {} n;");
+  verifyFormat("class __attribute__(X) Z {} n;");
+  verifyFormat("class __declspec(X) Z {} n;");
+
+  // Elaborate types where incorrectly parsing the structural element would
+  // break the indent.
+  verifyFormat("if (true)\n"
+               "  class X x;\n"
+               "else\n"
+               "  f();\n");
 }
 
 // FIXME: This breaks the order of the unwrapped lines: