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Author SHA1 Message Date
Argyrios Kyrtzidis e72f7154f1 Follow through references to catch returned stack addresses, local blocks, label addresses or references to temporaries, e.g: 
const int& g2() {
  int s1;
  int &s2 = s1; // expected-note {{binding reference variable 's2' here}}
  return s2; // expected-warning {{reference to stack memory associated with local variable 's1' returned}}
}

llvm-svn: 120483
 2010-11-30 22:57:32 +00:00
Argyrios Kyrtzidis 091d97c709 Revert r120331 since it causes spurious warnings and a possible assertion hit when self-host. 
llvm-svn: 120351
 2010-11-29 23:42:03 +00:00
Argyrios Kyrtzidis 569cad9734 Emit warnings if we are returning a reference to a local temporary. 
The issue was brought to our attention by Matthieu Monrocq.

llvm-svn: 120331
 2010-11-29 22:32:08 +00:00
Ted Kremenek b786156b01 Teach SemaChecking::CheckReturnStackAddr about ImplicitCastExprs that convert values to an lvalue. This allows us to warn (again) about returning references to stack variables. (fixes PR 7812). 
llvm-svn: 110242
 2010-08-04 20:01:07 +00:00