rnk created this revision.
rnk added reviewers: rsmith, thakis, hans.
This fixes PR33561 and PR34185.
Don't store pending template instantiations for late-parsed templates in
the normal PendingInstantiations queue. Instead, use a separate list
that will only be parsed and instantiated at end of TU when late
template parsing actually works and doesn't infinite loop.
https://reviews.llvm.org/D44846
Files:
clang/include/clang/Sema/Sema.h
clang/lib/Sema/Sema.cpp
clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
clang/test/SemaTemplate/late-parsing-eager-instantiation.cpp
Index: clang/test/SemaTemplate/late-parsing-eager-instantiation.cpp
===================================================================
--- /dev/null
+++ clang/test/SemaTemplate/late-parsing-eager-instantiation.cpp
@@ -0,0 +1,40 @@
+// RUN: %clang_cc1 -std=c++14 -verify %s
+
+// pr33561
+class ArrayBuffer;
+template <typename T> class Trans_NS_WTF_RefPtr {
+public:
+ ArrayBuffer *operator->() { return nullptr; }
+};
+Trans_NS_WTF_RefPtr<ArrayBuffer> get();
+template <typename _Visitor>
+constexpr void visit(_Visitor __visitor) {
+ __visitor(get()); // expected-note {{in instantiation}}
+}
+class ArrayBuffer {
+ char data() {
+ visit([](auto buffer) -> char { // expected-note {{in instantiation}}
+ buffer->data();
+ }); // expected-warning {{control reaches end of non-void lambda}}
+ } // expected-warning {{control reaches end of non-void function}}
+};
+
+// pr34185
+template <typename Promise> struct coroutine_handle {
+ Promise &promise() const { return
+ *static_cast<Promise *>(nullptr); // expected-warning {{binding
dereferenced null}}
+ }
+};
+
+template <typename Promise> auto GetCurrenPromise() {
+ struct Awaiter { // expected-note {{in instantiation}}
+ void await_suspend(coroutine_handle<Promise> h) {
+ h.promise(); // expected-note {{in instantiation}}
+ }
+ };
+ return Awaiter{};
+}
+
+void foo() {
+ auto &&p = GetCurrenPromise<int>(); // expected-note {{in instantiation}}
+}
Index: clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
===================================================================
--- clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -3837,8 +3837,8 @@
if (PatternDecl->isLateTemplateParsed() &&
!LateTemplateParser) {
Function->setInstantiationIsPending(true);
- PendingInstantiations.push_back(
- std::make_pair(Function, PointOfInstantiation));
+ LateParsedInstantiations.push_back(
+ std::make_pair(Function, PointOfInstantiation));
return;
}
Index: clang/lib/Sema/Sema.cpp
===================================================================
--- clang/lib/Sema/Sema.cpp
+++ clang/lib/Sema/Sema.cpp
@@ -879,8 +879,20 @@
PendingInstantiations.insert(PendingInstantiations.begin(),
Pending.begin(), Pending.end());
}
+
+ // Now that we are at the end of the TU and we have the late template
+ // parser, transfer late parsed instantiations onto PendingInstantiations.
+ PendingInstantiations.insert(PendingInstantiations.end(),
+ LateParsedInstantiations.begin(),
+ LateParsedInstantiations.end());
+ LateParsedInstantiations.clear();
+
PerformPendingInstantiations();
+ assert(LateParsedInstantiations.empty() &&
+ "end of TU template instantiation should not create more "
+ "late-parsed templates");
+
if (LateTemplateParserCleanup)
LateTemplateParserCleanup(OpaqueParser);
Index: clang/include/clang/Sema/Sema.h
===================================================================
--- clang/include/clang/Sema/Sema.h
+++ clang/include/clang/Sema/Sema.h
@@ -7550,6 +7550,10 @@
/// but have not yet been performed.
std::deque<PendingImplicitInstantiation> PendingInstantiations;
+ /// Queue of implicit template instantiations that cannot be performed
+ /// eagerly.
+ SmallVector<PendingImplicitInstantiation, 1> LateParsedInstantiations;
+
class GlobalEagerInstantiationScope {
public:
GlobalEagerInstantiationScope(Sema &S, bool Enabled)
Index: clang/test/SemaTemplate/late-parsing-eager-instantiation.cpp
===================================================================
--- /dev/null
+++ clang/test/SemaTemplate/late-parsing-eager-instantiation.cpp
@@ -0,0 +1,40 @@
+// RUN: %clang_cc1 -std=c++14 -verify %s
+
+// pr33561
+class ArrayBuffer;
+template <typename T> class Trans_NS_WTF_RefPtr {
+public:
+ ArrayBuffer *operator->() { return nullptr; }
+};
+Trans_NS_WTF_RefPtr<ArrayBuffer> get();
+template <typename _Visitor>
+constexpr void visit(_Visitor __visitor) {
+ __visitor(get()); // expected-note {{in instantiation}}
+}
+class ArrayBuffer {
+ char data() {
+ visit([](auto buffer) -> char { // expected-note {{in instantiation}}
+ buffer->data();
+ }); // expected-warning {{control reaches end of non-void lambda}}
+ } // expected-warning {{control reaches end of non-void function}}
+};
+
+// pr34185
+template <typename Promise> struct coroutine_handle {
+ Promise &promise() const { return
+ *static_cast<Promise *>(nullptr); // expected-warning {{binding dereferenced null}}
+ }
+};
+
+template <typename Promise> auto GetCurrenPromise() {
+ struct Awaiter { // expected-note {{in instantiation}}
+ void await_suspend(coroutine_handle<Promise> h) {
+ h.promise(); // expected-note {{in instantiation}}
+ }
+ };
+ return Awaiter{};
+}
+
+void foo() {
+ auto &&p = GetCurrenPromise<int>(); // expected-note {{in instantiation}}
+}
Index: clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
===================================================================
--- clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -3837,8 +3837,8 @@
if (PatternDecl->isLateTemplateParsed() &&
!LateTemplateParser) {
Function->setInstantiationIsPending(true);
- PendingInstantiations.push_back(
- std::make_pair(Function, PointOfInstantiation));
+ LateParsedInstantiations.push_back(
+ std::make_pair(Function, PointOfInstantiation));
return;
}
Index: clang/lib/Sema/Sema.cpp
===================================================================
--- clang/lib/Sema/Sema.cpp
+++ clang/lib/Sema/Sema.cpp
@@ -879,8 +879,20 @@
PendingInstantiations.insert(PendingInstantiations.begin(),
Pending.begin(), Pending.end());
}
+
+ // Now that we are at the end of the TU and we have the late template
+ // parser, transfer late parsed instantiations onto PendingInstantiations.
+ PendingInstantiations.insert(PendingInstantiations.end(),
+ LateParsedInstantiations.begin(),
+ LateParsedInstantiations.end());
+ LateParsedInstantiations.clear();
+
PerformPendingInstantiations();
+ assert(LateParsedInstantiations.empty() &&
+ "end of TU template instantiation should not create more "
+ "late-parsed templates");
+
if (LateTemplateParserCleanup)
LateTemplateParserCleanup(OpaqueParser);
Index: clang/include/clang/Sema/Sema.h
===================================================================
--- clang/include/clang/Sema/Sema.h
+++ clang/include/clang/Sema/Sema.h
@@ -7550,6 +7550,10 @@
/// but have not yet been performed.
std::deque<PendingImplicitInstantiation> PendingInstantiations;
+ /// Queue of implicit template instantiations that cannot be performed
+ /// eagerly.
+ SmallVector<PendingImplicitInstantiation, 1> LateParsedInstantiations;
+
class GlobalEagerInstantiationScope {
public:
GlobalEagerInstantiationScope(Sema &S, bool Enabled)
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