[clang] [clang][ASTImporter] Import explicit object parameter location (PR #124262)

[Michael Buch via cfe-commits]

https://github.com/Michael137 created 
https://github.com/llvm/llvm-project/pull/124262

Make sure to import the explicit object parameter location for `ParmVarDecl`s. 
This is how Clang determines whether a parameter `isExplicitObjectParamater`. 
This will be needed to enable expression evaluation of explicit member 
functions from LLDB.

>From ff885745df0d4842dd4c541ec5e3c6cbb557f6a5 Mon Sep 17 00:00:00 2001
From: Michael Buch <michaelbuc...@gmail.com>
Date: Fri, 24 Jan 2025 11:59:42 +0000
Subject: [PATCH] [clang][ASTImporter] Import explicit object parameter
 location

Make sure to import the explicit object parameter location for
`ParmVarDecl`s. This is how Clang determines whether a parameter
`isExplicitObjectParamater`. This will be needed to enable expression
evaluation of explicit member functions from LLDB.
---
 clang/lib/AST/ASTImporter.cpp           |  9 +++++++++
 clang/unittests/AST/ASTImporterTest.cpp | 18 ++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 0669aa1b809c34..c946a7687670f8 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -4756,6 +4756,15 @@ ExpectedDecl 
ASTNodeImporter::VisitParmVarDecl(ParmVarDecl *D) {
                               /*DefaultArg*/ nullptr))
     return ToParm;
 
+  if (D->isExplicitObjectParameter()) {
+    auto ToExplicitObjectParameterLoc =
+        importChecked(Err, D->getExplicitObjectParamThisLoc());
+    if (Err)
+      return std::move(Err);
+
+    ToParm->setExplicitObjectParameterLoc(ToExplicitObjectParameterLoc);
+  }
+
   // Set the default argument. It should be no problem if it was already done.
   // Do not import the default expression before GetImportedOrCreateDecl call
   // to avoid possible infinite import loop because circular dependency.
diff --git a/clang/unittests/AST/ASTImporterTest.cpp 
b/clang/unittests/AST/ASTImporterTest.cpp
index 791248e7a394f1..49b970708d73af 100644
--- a/clang/unittests/AST/ASTImporterTest.cpp
+++ b/clang/unittests/AST/ASTImporterTest.cpp
@@ -3441,6 +3441,7 @@ TEST_P(ASTImporterOptionSpecificTestBase, 
ImportParmVarDecl) {
   ASSERT_TRUE(FromVar);
   ASSERT_TRUE(FromVar->hasUninstantiatedDefaultArg());
   ASSERT_TRUE(FromVar->getUninstantiatedDefaultArg());
+  ASSERT_FALSE(FromVar->isExplicitObjectParameter());
 
   const auto *ToVar = Import(FromVar, Lang_CXX11);
   EXPECT_TRUE(ToVar);
@@ -3448,6 +3449,23 @@ TEST_P(ASTImporterOptionSpecificTestBase, 
ImportParmVarDecl) {
   EXPECT_TRUE(ToVar->getUninstantiatedDefaultArg());
   EXPECT_NE(FromVar->getUninstantiatedDefaultArg(),
             ToVar->getUninstantiatedDefaultArg());
+  EXPECT_FALSE(ToVar->isExplicitObjectParameter());
+}
+
+TEST_P(ASTImporterOptionSpecificTestBase, ImportParmVarDecl_Explicit) {
+  const auto *Code = R"(
+    struct Wrapper {
+      Wrapper(this Wrapper) {}
+    };
+    )";
+  Decl *FromTU = getTuDecl(Code, Lang_CXX23);
+  auto *FromVar = FirstDeclMatcher<ParmVarDecl>().match(FromTU, parmVarDecl());
+  ASSERT_TRUE(FromVar);
+  ASSERT_TRUE(FromVar->isExplicitObjectParameter());
+
+  const auto *ToVar = Import(FromVar, Lang_CXX23);
+  EXPECT_TRUE(ToVar);
+  EXPECT_TRUE(ToVar->isExplicitObjectParameter());
 }
 
 TEST_P(ASTImporterOptionSpecificTestBase, ImportOfNonEquivalentField) {

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