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
f100(S100 s)14 S100 f100(S100 s) { return s; }
15
f101(S101 s)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
f101_no_param_name(S101)19 void f101_no_param_name(S101) {} // expected-warning {{'' is a large (101 bytes) pass-by-value argument}}
20
21 // FIXME: Don't warn when when the return value is subject to (N)RVO.
22
23 template <typename T> T foo_template(T);
foo_template(S101)24 template <> S101 foo_template(S101) { return S101(); } // expected-warning {{return value of 'foo_template<rdar8548050::S101>' is a large}}
25 // expected-warning@-1 {{'' is a large (101 bytes) pass-by-value argument}}
26
27 typedef int Arr[200];
farr(Arr a)28 void farr(Arr a) { }
29
30 struct NonPOD {
31 char x[200];
32 virtual void m();
33 };
34
fNonPOD(NonPOD s)35 NonPOD fNonPOD(NonPOD s) { return s; }
36
37 template <unsigned size>
38 struct TS {
39 char x[size];
40 };
41
42 template <unsigned size>
tf(TS<size> ts)43 void tf(TS<size> ts) {} // expected-warning {{ts' is a large (300 bytes) pass-by-value argument}}
44
g()45 void g() {
46 TS<300> ts;
47 tf<300>(ts); // expected-note {{instantiation}}
48 }
49
50 }
51
52 template<typename T> class DependentPOD {
53 enum b { x };
foo()54 b foo() { return x; }
55 };
56