C: add "__thread" GCC extension keyword

The parser records it to "properties:" field as "thread_local" property.

Signed-off-by: Masatake YAMATO <[email protected]>

Author: masatake

Units/parser-c.r/properties-thread.d/args.ctags

@@ -0,0 +1,4 @@
+--sort=no
+--kinds-c=*-{parameter}
+--fields=+x
+--fields-c=+{properties}

Units/parser-c.r/properties-thread.d/expected.tags

@@ -0,0 +1,3 @@
+i	input.c	/^__thread int i;$/;"	v	typeref:typename:int	properties:thread_local
+s	input.c	/^extern __thread struct state s;$/;"	x	typeref:struct:state	properties:extern,thread_local
+p	input.c	/^static __thread char *p;$/;"	v	typeref:typename:char *	file:	properties:static,thread_local

Units/parser-c.r/properties-thread.d/input.c

@@ -0,0 +1,4 @@
+/* Taken from https://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Thread-Local.html#Thread-Local */
+__thread int i;
+extern __thread struct state s;
+static __thread char *p;

parsers/cxx/cxx_keyword.c

@@ -136,6 +136,11 @@ static CXXKeywordDescriptor g_aCXXKeywordTable[] = {
 		CXXLanguageCPP,
 		0
 	},
+	{
+		"__thread",
+		CXXLanguageC | CXXLanguageCPP,
+		CXXKeywordMayAppearInVariableDeclaration | CXXKeywordExcludeFromTypeNames,
+	},
 	{
 		"alignas",
 		CXXLanguageCPP,

parsers/cxx/cxx_keyword.h

@@ -33,6 +33,7 @@ typedef enum _CXXKeyword
 	CXXKeyword__SHARED__, // CUDA
 	CXXKeyword__STDCALL, // Microsoft C/C++
 	CXXKeyword__THISCALL, // Microsoft C/C++
+	CXXKeyword__THREAD, // GCC (https://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Thread-Local.html#Thread-Local)
 	CXXKeywordALIGNAS, // (since C++11)
 	CXXKeywordALIGNOF, // (since C++11)
 	//CXXKeywordAND,

parsers/cxx/cxx_parser_block.c

@@ -647,6 +647,7 @@ static bool cxxParserParseBlockInternal(bool bExpectClosingBracket)
 						g_cxx.uKeywordState |= CXXParserKeywordStateSeenConstinit;
 					break;
 					case CXXKeywordTHREAD_LOCAL:
+					case CXXKeyword__THREAD:
 						g_cxx.uKeywordState |= CXXParserKeywordStateSeenThreadLocal;
 					break;