commit 788a2227b7bcbff8384fe0b96e4bd66bfa11ccf1
author Ben Hamilton <benhamilton@google.com> Mon Mar 12 15:42:40 2018 +0000
committer Ben Hamilton <benhamilton@google.com> Mon Mar 12 15:42:40 2018 +0000
tree 01e0b8735f503c1be3dc8c069408387a8ca3c811
parent b060ad870f4e3770e4d5b2ca149c59669f8d56b8

[clang-format] Improve detection of Objective-C block types

Summary:
Previously, clang-format would detect the following as an
Objective-C block type:

  FOO(^);

when it actually must be a C or C++ macro dealing with an XOR
statement or an XOR operator overload.

According to the Clang Block Language Spec:

https://clang.llvm.org/docs/BlockLanguageSpec.html

block types are of the form:

  int (^)(char, float)

and block variables of block type are of the form:

  void (^blockReturningVoidWithVoidArgument)(void);
  int (^blockReturningIntWithIntAndCharArguments)(int, char);
  void (^arrayOfTenBlocksReturningVoidWithIntArgument[10])(int);

This tightens up the detection so we don't unnecessarily detect
C macros which pass in the XOR operator.

Depends On D43904

Test Plan: New tests added. Ran tests with:
  make -j12 FormatTests &&
  ./tools/clang/unittests/Format/FormatTests

Reviewers: krasimir, jolesiak, djasper

Reviewed By: djasper

Subscribers: djasper, cfe-commits, klimek

Differential Revision: https://reviews.llvm.org/D43906

llvm-svn: 327285

clang/unittests/Format/FormatTest.cpp

diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 7e0904c..a9fbe4b 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -12128,6 +12128,22 @@
   EXPECT_EQ(FormatStyle::LK_Cpp, guessLanguage("foo.h", "[[foo::bar, ...]]"));
 }
 
+TEST_F(FormatTest, GuessLanguageWithCaret) {
+  EXPECT_EQ(FormatStyle::LK_Cpp, guessLanguage("foo.h", "FOO(^);"));
+  EXPECT_EQ(FormatStyle::LK_Cpp, guessLanguage("foo.h", "FOO(^, Bar);"));
+  EXPECT_EQ(FormatStyle::LK_ObjC,
+            guessLanguage("foo.h", "int(^)(char, float);"));
+  EXPECT_EQ(FormatStyle::LK_ObjC,
+            guessLanguage("foo.h", "int(^foo)(char, float);"));
+  EXPECT_EQ(FormatStyle::LK_ObjC,
+            guessLanguage("foo.h", "int(^foo[10])(char, float);"));
+  EXPECT_EQ(FormatStyle::LK_ObjC,
+            guessLanguage("foo.h", "int(^foo[kNumEntries])(char, float);"));
+  EXPECT_EQ(
+      FormatStyle::LK_ObjC,
+      guessLanguage("foo.h", "int(^foo[(kNumEntries + 10)])(char, float);"));
+}
+
 } // end namespace
 } // end namespace format
 } // end namespace clang

clang/unittests/Format/FormatTestObjC.cpp

diff --git a/clang/unittests/Format/FormatTestObjC.cpp b/clang/unittests/Format/FormatTestObjC.cpp
index 8773088..efc227d 100644
--- a/clang/unittests/Format/FormatTestObjC.cpp
+++ b/clang/unittests/Format/FormatTestObjC.cpp
@@ -845,6 +845,15 @@
   verifyFormat("@ /*foo*/ interface");
 }
 
+TEST_F(FormatTestObjC, ObjCBlockTypesAndVariables) {
+  verifyFormat("void DoStuffWithBlockType(int (^)(char));");
+  verifyFormat("int (^foo)(char, float);");
+  verifyFormat("int (^foo[10])(char, float);");
+  verifyFormat("int (^foo[kNumEntries])(char, float);");
+  verifyFormat("int (^foo[kNumEntries + 10])(char, float);");
+  verifyFormat("int (^foo[(kNumEntries + 10)])(char, float);");
+}
+
 TEST_F(FormatTestObjC, ObjCSnippets) {
   verifyFormat("@autoreleasepool {\n"
                "  foo();\n"