test/SemaCXX/warn-large-by-value-copy.cpp

   1 // RUN: %clang_cc1 -verify -fsyntax-only -Wlarge-by-value-copy=100 %s
   2
   3 // rdar://8548050
   4 namespace rdar8548050 {
   5
   6 struct S100 {
   7     char x[100];
   8 };
   9
  10 struct S101 {
  11     char x[101];
  12 };
  13
  14 S100 f100(S100 s) { return s; }
  15
  16 S101 f101(S101 s) { return s; } // expected-warning {{return value of 'f101' is a large (101 bytes) pass-by-value object}} \
  17                                 // expected-warning {{'s' is a large (101 bytes) pass-by-value argument}}
  18
  19 typedef int Arr[200];
  20 void farr(Arr a) { }
  21
  22 struct NonPOD {
  23   char x[200];
  24   virtual void m();
  25 };
  26
  27 NonPOD fNonPOD(NonPOD s) { return s; }
  28
  29 template <unsigned size>
  30 struct TS {
  31     char x[size];
  32 };
  33
  34 template <unsigned size>
  35 void tf(TS<size> ts) {} // expected-warning {{ts' is a large (300 bytes) pass-by-value argument}}
  36
  37 void g() {
  38     TS<300> ts;
  39     tf<300>(ts); // expected-note {{instantiation}}
  40 }
  41
  42 }