1 // RUN: %clang_cc1 -verify -fsyntax-only -Wlarge-by-value-copy=100 %s
2
3 namespace rdar8548050 {
4
5 struct S100 {
6 char x[100];
7 };
8
9 struct S101 {
10 char x[101];
11 };
12
f100(S100 s)13 S100 f100(S100 s) { return s; }
14
f101(S101 s)15 S101 f101(S101 s) { return s; } // expected-warning {{return value of 'f101' is a large (101 bytes) pass-by-value object}} \
16 // expected-warning {{'s' is a large (101 bytes) pass-by-value argument}}
17
f101_no_param_name(S101)18 void f101_no_param_name(S101) {} // expected-warning {{'' is a large (101 bytes) pass-by-value argument}}
19
20 // FIXME: Don't warn when when the return value is subject to (N)RVO.
21
22 template <typename T> T foo_template(T);
foo_template(S101)23 template <> S101 foo_template(S101) { return S101(); } // expected-warning {{return value of 'foo_template<rdar8548050::S101>' is a large}}
24 // expected-warning@-1 {{'' is a large (101 bytes) pass-by-value argument}}
25
26 typedef int Arr[200];
farr(Arr a)27 void farr(Arr a) { }
28
29 struct NonPOD {
30 char x[200];
31 virtual void m();
32 };
33
fNonPOD(NonPOD s)34 NonPOD fNonPOD(NonPOD s) { return s; }
35
36 template <unsigned size>
37 struct TS {
38 char x[size];
39 };
40
41 template <unsigned size>
tf(TS<size> ts)42 void tf(TS<size> ts) {} // expected-warning {{ts' is a large (300 bytes) pass-by-value argument}}
43
g()44 void g() {
45 TS<300> ts;
46 tf<300>(ts); // expected-note {{instantiation}}
47 }
48
49 }
50
51 template<typename T> class DependentPOD {
52 enum b { x };
foo()53 b foo() { return x; }
54 };
55