Support: ensure proper state in ErrorOr copy ctors before calling 'get'

Some paths through the copy constructors for 'ErrorOr' were calling
'get' when 'HasError' and 'IsValid' were not properly initialized.
Depending on what happened to be in memory for those member variables
the asserts in 'get' might incorrectly fire.  Fixed by ensuring that
the member variables in question are always initialized before calling
'get'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174381 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 7 deletions

diff --git a/include/llvm/Support/ErrorOr.h b/include/llvm/Support/ErrorOr.h
index 653b9e5c88..c22c3ca84f 100644
--- a/include/llvm/Support/ErrorOr.h
+++ b/include/llvm/Support/ErrorOr.h
@@ -204,18 +204,17 @@ public:
     // Construct an invalid ErrorOr if other is invalid.
     if (!Other.IsValid)
       return;
+    IsValid = true;
     if (!Other.HasError) {
       // Get the other value.
-      new (get()) storage_type(*Other.get());
       HasError = false;
+      new (get()) storage_type(*Other.get());
     } else {
       // Get other's error.
       Error = Other.Error;
       HasError = true;
       Error->aquire();
     }
-
-    IsValid = true;
   }
 
   ErrorOr &operator =(const ErrorOr &Other) {
@@ -234,11 +233,11 @@ public:
     // Construct an invalid ErrorOr if other is invalid.
     if (!Other.IsValid)
       return;
+    IsValid = true;
     if (!Other.HasError) {
       // Get the other value.
-      IsValid = true;
-      new (get()) storage_type(std::move(*Other.get()));
       HasError = false;
+      new (get()) storage_type(std::move(*Other.get()));
       // Tell other not to do any destruction.
       Other.IsValid = false;
     } else {
@@ -248,8 +247,6 @@ public:
       // Tell other not to do any destruction.
       Other.IsValid = false;
     }
-
-    IsValid = true;
   }
 
   ErrorOr &operator =(ErrorOr &&Other) {