return C language format style for OpenCL

Author: wenju-he

clang/lib/Format/Format.cpp

@@ -4094,6 +4094,9 @@ static FormatStyle::LanguageKind getLanguageByFileName(StringRef FileName) {
       FileName.ends_with_insensitive(".vh")) {
     return FormatStyle::LK_Verilog;
   }
+  // OpenCL is based on C99 and C11.
+  if (FileName.ends_with(".cl"))
+    return FormatStyle::LK_C;
   return FormatStyle::LK_Cpp;
 }
 
@@ -4121,6 +4124,8 @@ static FormatStyle::LanguageKind getLanguageByComment(const Environment &Env) {
       return FormatStyle::LK_Cpp;
     if (Text == "ObjC")
       return FormatStyle::LK_ObjC;
+    if (Text == "OpenCL")
+      return FormatStyle::LK_C;
   }
 
   return FormatStyle::LK_None;

clang/test/Format/dump-config-opencl-stdin.cl

@@ -0,0 +1,7 @@
+// RUN: clang-format -assume-filename=foo.cl -dump-config | FileCheck %s
+
+// RUN: clang-format -dump-config - < %s | FileCheck %s
+
+// CHECK: Language: C
+
+void foo() {}

clang/test/Format/lit.local.cfg

@@ -20,7 +20,8 @@ config.suffixes = [
     ".textpb",
     ".asciipb",
     ".td",
-    ".test"
+    ".test",
+    ".cl"
 ]
 
 # AIX 'diff' command doesn't support --strip-trailing-cr, but the internal

clang/unittests/Format/FormatTest.cpp

@@ -25187,6 +25187,9 @@ TEST_F(FormatTest, GetLanguageByComment) {
   EXPECT_EQ(FormatStyle::LK_ObjC,
             guessLanguage("foo.h", "// clang-format Language: ObjC\n"
                                    "int i;"));
+  EXPECT_EQ(FormatStyle::LK_C,
+            guessLanguage("foo.h", "// clang-format Language: OpenCL\n"
+                                   "int i;"));
 }
 
 TEST_F(FormatTest, TypenameMacros) {