[PATCH] D87350: [AST][RecoveryExpr] Fix a crash on undeduced type.

[Haojian Wu via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG7f05fe1aeeb0: [AST][RecoveryExpr] Fix a crash on undeduced type. (authored by hokein).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D87350/new/

https://reviews.llvm.org/D87350

Files:
  clang/lib/Sema/SemaOverload.cpp
  clang/test/AST/ast-dump-recovery.cpp
  clang/test/SemaCXX/recovery-expr-type.cpp


Index: clang/test/SemaCXX/recovery-expr-type.cpp
===================================================================
--- clang/test/SemaCXX/recovery-expr-type.cpp
+++ clang/test/SemaCXX/recovery-expr-type.cpp
@@ -105,3 +105,9 @@
 int v = arr(); // expected-error {{array types cannot be value-initialized}} \
                   expected-error {{cannot initialize a variable of type 'int' with an rvalue of type 'test8::arr'}}
 }
+
+namespace test9 {
+auto f(); // expected-note {{candidate function not viable}}
+// verify no crash on evaluating the size of undeduced auto type.
+static_assert(sizeof(f(1)), ""); // expected-error {{no matching function for call to 'f'}}
+}
Index: clang/test/AST/ast-dump-recovery.cpp
===================================================================
--- clang/test/AST/ast-dump-recovery.cpp
+++ clang/test/AST/ast-dump-recovery.cpp
@@ -126,6 +126,12 @@
 // CHECK-NEXT:|   `-UnresolvedLookupExpr {{.*}} 'invalid'
 struct alignas(invalid()) Aligned {};
 
+auto f();
+int f(double);
+// CHECK:      VarDecl {{.*}} unknown_type_call 'int'
+// CHECK-NEXT: `-RecoveryExpr {{.*}} '<dependent type>'
+int unknown_type_call = f(0, 0);
+
 void InvalidInitalizer(int x) {
   struct Bar { Bar(); };
   // CHECK:     `-VarDecl {{.*}} a1 'Bar'
Index: clang/lib/Sema/SemaOverload.cpp
===================================================================
--- clang/lib/Sema/SemaOverload.cpp
+++ clang/lib/Sema/SemaOverload.cpp
@@ -12880,7 +12880,12 @@
     for (const auto &C : CS)
       ConsiderCandidate(C);
 
-  return Result.getValueOr(QualType());
+  if (!Result)
+    return QualType();
+  auto Value = Result.getValue();
+  if (Value.isNull() || Value->isUndeducedType())
+    return QualType();
+  return Value;
 }
 
 /// FinishOverloadedCallExpr - given an OverloadCandidateSet, builds and returns


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D87350.296146.patch
Type: text/x-patch
Size: 1827 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20201005/68f29fe3/attachment.bin>