[clang] 89c1a7a - [ASTImporter] Import the default argument of NonTypeTemplateParmDecl

[Raphael Isemann via cfe-commits]

Author: Raphael Isemann
Date: 2020-11-27T11:40:07+01:00
New Revision: 89c1a7a67d6947f56dc2db189d3872626f5a8609

URL: https://github.com/llvm/llvm-project/commit/89c1a7a67d6947f56dc2db189d3872626f5a8609
DIFF: https://github.com/llvm/llvm-project/commit/89c1a7a67d6947f56dc2db189d3872626f5a8609.diff

LOG: [ASTImporter] Import the default argument of NonTypeTemplateParmDecl

The test case isn't using the AST matchers for all checks as there doesn't seem to be support for
matching NonTypeTemplateParmDecl default arguments. Otherwise this is simply importing the
default arguments.

Reviewed By: martong

Differential Revision: https://reviews.llvm.org/D92106

Added: 
    

Modified: 
    clang/lib/AST/ASTImporter.cpp
    clang/unittests/AST/ASTImporterTest.cpp

Removed: 
    


################################################################################
diff  --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 5159682da85f..01ee8d275af1 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -5227,15 +5227,22 @@ ASTNodeImporter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
   if (Err)
     return std::move(Err);
 
-  // FIXME: Import default argument.
-
   NonTypeTemplateParmDecl *ToD = nullptr;
-  (void)GetImportedOrCreateDecl(
-      ToD, D, Importer.getToContext(),
-      Importer.getToContext().getTranslationUnitDecl(),
-      ToInnerLocStart, ToLocation, D->getDepth(),
-      D->getPosition(), ToDeclName.getAsIdentifierInfo(), ToType,
-      D->isParameterPack(), ToTypeSourceInfo);
+  if (GetImportedOrCreateDecl(ToD, D, Importer.getToContext(),
+                              Importer.getToContext().getTranslationUnitDecl(),
+                              ToInnerLocStart, ToLocation, D->getDepth(),
+                              D->getPosition(),
+                              ToDeclName.getAsIdentifierInfo(), ToType,
+                              D->isParameterPack(), ToTypeSourceInfo))
+    return ToD;
+
+  if (D->hasDefaultArgument()) {
+    ExpectedExpr ToDefaultArgOrErr = import(D->getDefaultArgument());
+    if (!ToDefaultArgOrErr)
+      return ToDefaultArgOrErr.takeError();
+    ToD->setDefaultArgument(*ToDefaultArgOrErr);
+  }
+
   return ToD;
 }
 

diff  --git a/clang/unittests/AST/ASTImporterTest.cpp b/clang/unittests/AST/ASTImporterTest.cpp
index 5a93a7348e7a..81a92a10f48d 100644
--- a/clang/unittests/AST/ASTImporterTest.cpp
+++ b/clang/unittests/AST/ASTImporterTest.cpp
@@ -953,6 +953,27 @@ TEST_P(ASTImporterOptionSpecificTestBase, TemplateTemplateParmDeclDefaultArg) {
   ASSERT_EQ(ToTemplate, ToExpectedDecl);
 }
 
+TEST_P(ASTImporterOptionSpecificTestBase, NonTypeTemplateParmDeclNoDefaultArg) {
+  Decl *FromTU = getTuDecl("template<int N> struct X {};", Lang_CXX03);
+  auto From = FirstDeclMatcher<NonTypeTemplateParmDecl>().match(
+      FromTU, nonTypeTemplateParmDecl(hasName("N")));
+  NonTypeTemplateParmDecl *To = Import(From, Lang_CXX03);
+  ASSERT_FALSE(To->hasDefaultArgument());
+}
+
+TEST_P(ASTImporterOptionSpecificTestBase, NonTypeTemplateParmDeclDefaultArg) {
+  Decl *FromTU = getTuDecl("template<int S = 1> struct X {};", Lang_CXX03);
+  auto From = FirstDeclMatcher<NonTypeTemplateParmDecl>().match(
+      FromTU, nonTypeTemplateParmDecl(hasName("S")));
+  NonTypeTemplateParmDecl *To = Import(From, Lang_CXX03);
+  ASSERT_TRUE(To->hasDefaultArgument());
+  Stmt *ToArg = To->getDefaultArgument();
+  ASSERT_TRUE(isa<ConstantExpr>(ToArg));
+  ToArg = *ToArg->child_begin();
+  ASSERT_TRUE(isa<IntegerLiteral>(ToArg));
+  ASSERT_EQ(cast<IntegerLiteral>(ToArg)->getValue().getLimitedValue(), 1U);
+}
+
 TEST_P(ASTImporterOptionSpecificTestBase,
        ImportOfTemplatedDeclOfClassTemplateDecl) {
   Decl *FromTU = getTuDecl("template<class X> struct S{};", Lang_CXX03);