expression. Implement C++11 [expr.prim.lambda]p12's requirement that
capturing a variable will odr-use it.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150237
91177308-0d34-0410-b5e6-
96231b3b80d8
// to be re-"exported" from the lambda expression itself.
S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
+ // C++ [expr.prim.labda]p12:
+ // An entity captured by a lambda-expression is odr-used (3.2) in
+ // the scope containing the lambda-expression.
Expr *Ref = new (S.Context) DeclRefExpr(Var, Type.getNonReferenceType(),
VK_LValue, Loc);
+ Var->setUsed(true);
// When the field has array type, create index variables for each
// dimension of the array. We use these index variables to subscript
MarkExprReferenced(*this, E->getMemberLoc(), E->getMemberDecl(), E);
}
-/// \brief Perform marking for a reference to an aribitrary declaration. It
+/// \brief Perform marking for a reference to an arbitrary declaration. It
/// marks the declaration referenced, and performs odr-use checking for functions
/// and variables. This method should not be used when building an normal
/// expression which refers to a variable.
(void)[&Variable] () {}; // expected-error {{use of undeclared identifier 'Variable'; did you mean 'variable'}}
}
};
+
+void test_reaching_scope() {
+ int local; // expected-note{{declared here}}
+ static int local_static; // expected-note{{'local_static' declared here}}
+ (void)[=]() {
+ struct InnerLocal {
+ void member() {
+ (void)[local, // expected-error{{reference to local variable 'local' declared in enclosing function 'test_reaching_scope'}}
+ local_static]() { // expected-error{{'local_static' cannot be captured because it does not have automatic storage duration}}
+ return 0;
+ };
+ }
+ };
+ };
+}
--- /dev/null
+// RUN: %clang_cc1 -std=c++11 %s -verify
+
+void test_reaching_scope() {
+ int local; // expected-note{{declared here}}
+ static int local_static;
+ (void)[=]() {
+ struct InnerLocal {
+ void member() {
+ (void)[=]() {
+ return local + // expected-error{{reference to local variable 'local' declared in enclosing function 'test_reaching_scope'}}
+ local_static;
+ };
+ }
+ };
+ };
+}
--- /dev/null
+// RUN: %clang_cc1 -std=c++11 %s -Wunused -verify
+
+void odr_used() {
+ int i = 17;
+ [i]{}();
+}
+
+struct ReachingThis {
+ static void static_foo() {
+ (void)[this](){}; // expected-error{{'this' cannot be captured in this context}}
+
+ struct Local {
+ int i;
+
+ void bar() {
+ (void)[this](){};
+ (void)[&](){i = 7; };
+ }
+ };
+ }
+
+ void foo() {
+ (void)[this](){};
+
+ struct Local {
+ int i;
+
+ static void static_bar() {
+ (void)[this](){}; // expected-error{{'this' cannot be captured in this context}}
+ (void)[&](){i = 7; }; // expected-error{{invalid use of nonstatic data member 'i'}}
+ }
+ };
+ }
+};
+
+void immediately_enclosing(int i) { // expected-note{{'i' declared here}}
+ [i]() {
+ [i] {}();
+ }();
+
+ [=]() {
+ [i] {}();
+ }();
+
+ []() { // expected-note{{lambda expression begins here}}
+ [i] {}(); // expected-error{{variable 'i' cannot be implicitly captured in a lambda with no capture-default specified}}
+ }();
+}