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[clang][AST] Add an AST matcher for deducedTemplateSpeializationType. 

Summary:
misc-unused-using clang-tidy check needs this matcher to fix a false
positive of C++17 deduced class template types.

Reviewers: gribozavr2

Reviewed By: gribozavr2

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D73869
This commit is contained in:
Haojian Wu 2020-02-03 12:10:56 +01:00
parent ae5d3e8c51
commit bdbdf74822
4 changed files with 37 additions and 1 deletions
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16
clang/docs/LibASTMatchersReference.html
View File

@ -1750,6 +1750,20 @@ decltypeType()
</pre></td></tr>
<tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1Type.html">Type</a>&gt;</td><td class="name" onclick="toggle('deducedTemplateSpecializationType0')"><a name="deducedTemplateSpecializationType0Anchor">deducedTemplateSpecializationType</a></td><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1DeducedTemplateSpecializationType.html">DeducedTemplateSpecializationType</a>&gt;...</td></tr>
<tr><td colspan="4" class="doc" id="deducedTemplateSpecializationType0"><pre>Matches C++17 deduced template specialization types, e.g. deduced class
template types.
Given
template &lt;typename T&gt;
class C { public: C(T); };
C c(123);
deducedTemplateSpecializationType() matches the type in the declaration
of the variable c.
</pre></td></tr>
<tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1Type.html">Type</a>&gt;</td><td class="name" onclick="toggle('dependentSizedArrayType0')"><a name="dependentSizedArrayType0Anchor">dependentSizedArrayType</a></td><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1DependentSizedArrayType.html">DependentSizedArrayType</a>&gt;...</td></tr>
<tr><td colspan="4" class="doc" id="dependentSizedArrayType0"><pre>Matches C++ arrays whose size is a value-dependent expression.
@ -3522,7 +3536,7 @@ void f() {}
</pre></td></tr>
<tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1NamedDecl.html">NamedDecl</a>&gt;</td><td class="name" onclick="toggle('hasName0')"><a name="hasName0Anchor">hasName</a></td><td>const std::string Name</td></tr>
<tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1NamedDecl.html">NamedDecl</a>&gt;</td><td class="name" onclick="toggle('hasName0')"><a name="hasName0Anchor">hasName</a></td><td>StringRef Name</td></tr>
<tr><td colspan="4" class="doc" id="hasName0"><pre>Matches NamedDecl nodes that have the specified name.
Supports specifying enclosing namespaces or classes by prefixing the name

15
clang/include/clang/ASTMatchers/ASTMatchers.h
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@ -6030,6 +6030,21 @@ extern const AstTypeMatcher<EnumType> enumType;
extern const AstTypeMatcher<TemplateSpecializationType>
templateSpecializationType;
/// Matches C++17 deduced template specialization types, e.g. deduced class
/// template types.
///
/// Given
/// \code
/// template <typename T>
/// class C { public: C(T); };
///
/// C c(123);
/// \endcode
/// \c deducedTemplateSpecializationType() matches the type in the declaration
/// of the variable \c c.
extern const AstTypeMatcher<DeducedTemplateSpecializationType>
deducedTemplateSpecializationType;
/// Matches types nodes representing unary type transformations.
///
/// Given:

1
clang/lib/ASTMatchers/Dynamic/Registry.cpp
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@ -202,6 +202,7 @@ RegistryMaps::RegistryMaps() {
REGISTER_MATCHER(declStmt);
REGISTER_MATCHER(declaratorDecl);
REGISTER_MATCHER(decltypeType);
REGISTER_MATCHER(deducedTemplateSpecializationType);
REGISTER_MATCHER(defaultStmt);
REGISTER_MATCHER(dependentSizedArrayType);
REGISTER_MATCHER(designatedInitExpr);

6
clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
View File

@ -1458,6 +1458,12 @@ TEST(TypeMatching, MatchesTemplateSpecializationType) {
templateSpecializationType()));
}
TEST(TypeMatching, MatchesDeucedTemplateSpecializationType) {
EXPECT_TRUE(matches("template <typename T> class A{ public: A(T) {} }; A a(1);",
deducedTemplateSpecializationType(),
LanguageMode::Cxx17OrLater));
}
TEST(TypeMatching, MatchesRecordType) {
EXPECT_TRUE(matches("class C{}; C c;", recordType()));
EXPECT_TRUE(matches("struct S{}; S s;",