[PATCH] D94719: [clangd] Make ExpandAutoType not available on template params.
Adam Czachorowski via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Thu Jan 14 13:44:31 PST 2021
adamcz created this revision.
adamcz added a reviewer: hokein.
Herald added subscribers: usaxena95, kadircet, arphaman.
adamcz requested review of this revision.
Herald added subscribers: cfe-commits, MaskRay, ilya-biryukov.
Herald added a project: clang.
We cannot expand auto when used inside a template param (C++17 feature),
so do not offer it there.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D94719
Files:
clang-tools-extra/clangd/refactor/tweaks/ExpandAutoType.cpp
clang-tools-extra/clangd/unittests/tweaks/ExpandAutoTypeTests.cpp
Index: clang-tools-extra/clangd/unittests/tweaks/ExpandAutoTypeTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/tweaks/ExpandAutoTypeTests.cpp
+++ clang-tools-extra/clangd/unittests/tweaks/ExpandAutoTypeTests.cpp
@@ -80,6 +80,9 @@
// unknown types in a template should not be replaced
EXPECT_THAT(apply("template <typename T> void x() { ^auto y = T::z(); }"),
StartsWith("fail: Could not deduce type for 'auto' type"));
+
+ ExtraArgs.push_back("-std=c++17");
+ EXPECT_UNAVAILABLE("template <au^to X> class Y;");
}
} // namespace
Index: clang-tools-extra/clangd/refactor/tweaks/ExpandAutoType.cpp
===================================================================
--- clang-tools-extra/clangd/refactor/tweaks/ExpandAutoType.cpp
+++ clang-tools-extra/clangd/refactor/tweaks/ExpandAutoType.cpp
@@ -82,6 +82,15 @@
return false;
}
+// Returns true iff "auto" in Node is really part of the template parameter,
+// which we cannot expand.
+bool isTemplateParam(const SelectionTree::Node *Node) {
+ if (Node->Parent)
+ if (Node->Parent->ASTNode.get<NonTypeTemplateParmDecl>())
+ return true;
+ return false;
+}
+
bool ExpandAutoType::prepare(const Selection& Inputs) {
CachedLocation = llvm::None;
if (auto *Node = Inputs.ASTSelection.commonAncestor()) {
@@ -90,7 +99,8 @@
// Code in apply() does handle 'decltype(auto)' yet.
if (!Result.getTypePtr()->isDecltypeAuto() &&
!isStructuredBindingType(Node) &&
- !isDeducedAsLambda(Node, Result.getBeginLoc()))
+ !isDeducedAsLambda(Node, Result.getBeginLoc()) &&
+ !isTemplateParam(Node))
CachedLocation = Result;
}
}
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