r182913 - Fix crasher when formatting certain block comments.

[Daniel Jasper]

Author: djasper
Date: Thu May 30 01:40:07 2013
New Revision: 182913

URL: http://llvm.org/viewvc/llvm-project?rev=182913&view=rev
Log:
Fix crasher when formatting certain block comments.

Smallest reproduction:
/*
**
*/

Modified:
    cfe/trunk/lib/Format/BreakableToken.cpp
    cfe/trunk/unittests/Format/FormatTest.cpp

Modified: cfe/trunk/lib/Format/BreakableToken.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Format/BreakableToken.cpp?rev=182913&r1=182912&r2=182913&view=diff
==============================================================================
--- cfe/trunk/lib/Format/BreakableToken.cpp (original)
+++ cfe/trunk/lib/Format/BreakableToken.cpp Thu May 30 01:40:07 2013
@@ -337,6 +337,11 @@ BreakableBlockComment::replaceWhitespace
       // contain a trailing whitespace.
       Prefix = Prefix.substr(0, 1);
     }
+  } else {
+    if (StartOfLineColumn[LineIndex] == 1) {
+      // This lines starts immediately after the decorating *.
+      Prefix = Prefix.substr(0, 1);
+    }
   }
 
   unsigned WhitespaceOffsetInToken =

Modified: cfe/trunk/unittests/Format/FormatTest.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/unittests/Format/FormatTest.cpp?rev=182913&r1=182912&r2=182913&view=diff
==============================================================================
--- cfe/trunk/unittests/Format/FormatTest.cpp (original)
+++ cfe/trunk/unittests/Format/FormatTest.cpp Thu May 30 01:40:07 2013
@@ -3640,6 +3640,7 @@ TEST_F(FormatTest, BlockComments) {
             format("#define A\n"
                    "/* */someCall(parameter);",
                    getLLVMStyleWithColumns(15)));
+  EXPECT_EQ("/*\n**\n*/", format("/*\n**\n*/"));
 
   FormatStyle NoBinPacking = getLLVMStyle();
   NoBinPacking.BinPackParameters = false;