ahatanak added a comment.
In CodeGenFunction::EmitARCRetainScalarExpr, if I move the declaration of
"scope" above the call to enterFullExpression, the cleanup is popped before the
loop body is entered right after the method returning the collection (foo1 in
the test case) is called.
if (const ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(e)) {
enterFullExpression(cleanups);
RunCleanupsScope scope(*this);
return EmitARCRetainScalarExpr(cleanups->getSubExpr());
}
The cleanup is entered in enterBlockScope which is transitively called from
enterFullExpression. EmitARCRetainScalarExpr is called at CGObjC.cpp:1491. The
Collection for ExprObjCForCollectionStmt is an ExprWithCleanups which has the
Block passed to foo1 attached to it and the cleanups for the captures of the
Block are entered in enterBlockScope.
http://reviews.llvm.org/D18618
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