[PATCH] Fixed a segfault when ElaboratedType has no NestedNameSpecifier

[Tareq A. Siraj]

Hi revane,

If the elaborated type has no nested name specifier, return false for the matcher. Also:
  - Re-generated docs for matchers
  - Added testcase

http://llvm-reviews.chandlerc.com/D490

Files:
  docs/LibASTMatchersReference.html
  include/clang/ASTMatchers/ASTMatchers.h
  unittests/ASTMatchers/ASTMatchersTest.cpp

Index: docs/LibASTMatchersReference.html
===================================================================
--- docs/LibASTMatchersReference.html
+++ docs/LibASTMatchersReference.html
@@ -2509,7 +2509,7 @@
 
 <tr><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1ElaboratedType.html">ElaboratedType</a>></td><td class="name" onclick="toggle('hasQualifier0')"><a name="hasQualifier0Anchor">hasQualifier</a></td><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1NestedNameSpecifier.html">NestedNameSpecifier</a>> InnerMatcher</td></tr>
 <tr><td colspan="4" class="doc" id="hasQualifier0"><pre>Matches ElaboratedTypes whose qualifier, a NestedNameSpecifier,
-matches InnerMatcher.
+matches InnerMatcher if the qualifier exists.
 
 Given
   namespace N {
Index: include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- include/clang/ASTMatchers/ASTMatchers.h
+++ include/clang/ASTMatchers/ASTMatchers.h
@@ -2965,7 +2965,7 @@
 AST_TYPE_MATCHER(ElaboratedType, elaboratedType);
 
 /// \brief Matches ElaboratedTypes whose qualifier, a NestedNameSpecifier,
-/// matches \c InnerMatcher.
+/// matches \c InnerMatcher if the qualifier exists.
 ///
 /// Given
 /// \code
@@ -2981,7 +2981,10 @@
 /// matches the type of the variable declaration of \c d.
 AST_MATCHER_P(ElaboratedType, hasQualifier,
               internal::Matcher<NestedNameSpecifier>, InnerMatcher) {
-  return InnerMatcher.matches(*Node.getQualifier(), Finder, Builder);
+  if (const NestedNameSpecifier *Qualifier = Node.getQualifier())
+    return InnerMatcher.matches(*Qualifier, Finder, Builder);
+
+  return false;
 }
 
 /// \brief Matches ElaboratedTypes whose named type matches \c InnerMatcher.
Index: unittests/ASTMatchers/ASTMatchersTest.cpp
===================================================================
--- unittests/ASTMatchers/ASTMatchersTest.cpp
+++ unittests/ASTMatchers/ASTMatchersTest.cpp
@@ -3469,6 +3469,10 @@
     "}"
     "M::D d;",
     elaboratedType(hasQualifier(hasPrefix(specifiesNamespace(hasName("N")))))));
+  EXPECT_TRUE(notMatches(
+    "struct D {"
+    "} d;",
+    elaboratedType(hasQualifier(nestedNameSpecifier()))));
 }
 
 TEST(ElaboratedTypeNarrowing, namesType) {
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