[pushed] c++: nested generic lambda in DMI [PR101717]
Commit Message
We were already checking COMPLETE_TYPE_P to recognize instantiation of a
generic lambda, but didn't consider that we might be nested in a non-generic
lambda.
Tested x86_64-pc-linux-gnu, applying to trunk.
PR c++/101717
gcc/cp/ChangeLog:
* lambda.cc (lambda_expr_this_capture): Check all enclosing
lambdas for completeness.
gcc/testsuite/ChangeLog:
* g++.dg/cpp1y/lambda-generic-this4.C: New test.
---
gcc/cp/lambda.cc | 8 +++++++-
gcc/testsuite/g++.dg/cpp1y/lambda-generic-this4.C | 7 +++++++
2 files changed, 14 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/g++.dg/cpp1y/lambda-generic-this4.C
base-commit: d9421784980276b42ecdce85b6dde28e965c88c6
@@ -741,6 +741,7 @@ lambda_expr_this_capture (tree lambda, int add_capture_p)
{
tree lambda_stack = NULL_TREE;
tree init = NULL_TREE;
+ bool saw_complete = false;
/* If we are in a lambda function, we can move out until we hit:
1. a non-lambda function or NSDMI,
@@ -759,6 +760,11 @@ lambda_expr_this_capture (tree lambda, int add_capture_p)
lambda_stack);
tree closure = LAMBDA_EXPR_CLOSURE (tlambda);
+ if (COMPLETE_TYPE_P (closure))
+ /* We're instantiating a generic lambda op(), the containing
+ scope may be gone. */
+ saw_complete = true;
+
tree containing_function
= decl_function_context (TYPE_NAME (closure));
@@ -768,7 +774,7 @@ lambda_expr_this_capture (tree lambda, int add_capture_p)
/* Lambda in an NSDMI. We don't have a function to look up
'this' in, but we can find (or rebuild) the fake one from
inject_this_parameter. */
- if (!containing_function && !COMPLETE_TYPE_P (closure))
+ if (!containing_function && !saw_complete)
/* If we're parsing a lambda in a non-local class,
we can find the fake 'this' in scope_chain. */
init = scope_chain->x_current_class_ptr;
new file mode 100644
@@ -0,0 +1,7 @@
+// PR c++/101717
+// { dg-do compile { target c++14 } }
+
+struct x {
+ static void f() { }
+ void (*_)() = [] { [=](auto) { f(); }(0); };
+};