[PATCH] D39722: [ASTImporter] Support TypeTraitExpr Importing

[Takafumi Kubota via Phabricator via cfe-commits]

tk1012 updated this revision to Diff 124232.
tk1012 added a comment.

Hello Aaron,

I remove the semicolon.

> Is this type actually correct for C++?

Yes, it is.
clang generates the AST for `declToImport` struct like this.

  |-CXXRecordDecl 0x8b19fe0 <col:22, col:29> col:29 implicit struct declToImport
  `-CXXMethodDecl 0x8b1a0d0 <line:2:3, col:27> col:8 m 'void (void)'
    `-CompoundStmt 0x8b1a1e8 <col:12, col:27>
      `-TypeTraitExpr 0x8b1a1c8 <col:14, col:24> '_Bool'




https://reviews.llvm.org/D39722

Files:
  lib/AST/ASTImporter.cpp
  unittests/AST/ASTImporterTest.cpp


Index: unittests/AST/ASTImporterTest.cpp
===================================================================
--- unittests/AST/ASTImporterTest.cpp
+++ unittests/AST/ASTImporterTest.cpp
@@ -525,6 +525,47 @@
                                          declRefExpr()))))))))));
 }
 
+/// \brief Matches __builtin_types_compatible_p:
+/// GNU extension to check equivalent types
+/// Given
+/// \code
+///   __builtin_types_compatible_p(int, int)
+/// \endcode
+//  will generate TypeTraitExpr <...> 'int'
+const internal::VariadicDynCastAllOfMatcher<Stmt, TypeTraitExpr> typeTraitExpr;
+
+TEST(ImportExpr, ImportTypeTraitExpr) {
+  MatchVerifier<Decl> Verifier;
+  EXPECT_TRUE(testImport("void declToImport() { "
+                         "  __builtin_types_compatible_p(int, int);"
+                         "}",
+                         Lang_C, "", Lang_C, Verifier,
+                         functionDecl(
+                           hasBody(
+                             compoundStmt(
+                               has(
+                                 typeTraitExpr(hasType(asString("int")))))))));
+}
+
+TEST(ImportExpr, ImportTypeTraitExprValDep) {
+  MatchVerifier<Decl> Verifier;
+  EXPECT_TRUE(testImport("template<typename T> struct declToImport {"
+                         "  void m() { __is_pod(T); }"
+                         "};"
+                         "void f() { declToImport<int>().m(); }",
+                         Lang_CXX11, "", Lang_CXX11, Verifier,
+                         classTemplateDecl(
+                           has(
+                             cxxRecordDecl(
+                               has(
+                                 functionDecl(
+                                   hasBody(
+                                     compoundStmt(
+                                       has(
+                                         typeTraitExpr(
+                                           hasType(asString("_Bool"))
+                                           )))))))))));
+}
 
 } // end namespace ast_matchers
 } // end namespace clang
Index: lib/AST/ASTImporter.cpp
===================================================================
--- lib/AST/ASTImporter.cpp
+++ lib/AST/ASTImporter.cpp
@@ -283,6 +283,7 @@
     Expr *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *E);
     Expr *VisitCXXNamedCastExpr(CXXNamedCastExpr *E);
     Expr *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E);
+    Expr *VisitTypeTraitExpr(TypeTraitExpr *E);
 
 
     template<typename IIter, typename OIter>
@@ -5612,6 +5613,26 @@
         Replacement);
 }
 
+Expr *ASTNodeImporter::VisitTypeTraitExpr(TypeTraitExpr *E) {
+  QualType ToType = Importer.Import(E->getType());
+  if (ToType.isNull())
+    return nullptr;
+
+  SmallVector<TypeSourceInfo *, 4> ToArgs(E->getNumArgs());
+  if (ImportContainerChecked(E->getArgs(), ToArgs))
+    return nullptr;
+
+  // According to Sema::BuildTypeTrait(), if E is value-dependent,
+  // Value is always false.
+  bool ToValue = false;
+  if (!E->isValueDependent())
+    ToValue = E->getValue();
+
+  return TypeTraitExpr::Create(
+      Importer.getToContext(), ToType, Importer.Import(E->getLocStart()),
+      E->getTrait(), ToArgs, Importer.Import(E->getLocEnd()), ToValue);
+}
+
 void ASTNodeImporter::ImportOverrides(CXXMethodDecl *ToMethod,
                                       CXXMethodDecl *FromMethod) {
   for (auto *FromOverriddenMethod : FromMethod->overridden_methods())


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