File: warn-large-by-value-copy.cpp

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (55 lines) | stat: -rw-r--r-- 1,432 bytes parent folder | download | duplicates (11)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
// RUN: %clang_cc1 -verify -fsyntax-only -Wlarge-by-value-copy=100 %s

// rdar://8548050
namespace rdar8548050 {

struct S100 {
    char x[100];
};

struct S101 {
    char x[101];
};

S100 f100(S100 s) { return s; }

S101 f101(S101 s) { return s; } // expected-warning {{return value of 'f101' is a large (101 bytes) pass-by-value object}} \
                                // expected-warning {{'s' is a large (101 bytes) pass-by-value argument}}

void f101_no_param_name(S101) {} // expected-warning {{'' is a large (101 bytes) pass-by-value argument}}

// FIXME: Don't warn when when the return value is subject to (N)RVO.

template <typename T> T foo_template(T);
template <> S101 foo_template(S101) { return S101(); } // expected-warning {{return value of 'foo_template<rdar8548050::S101>' is a large}}
                                                       // expected-warning@-1 {{'' is a large (101 bytes) pass-by-value argument}}

typedef int Arr[200];
void farr(Arr a) { }

struct NonPOD {
  char x[200];
  virtual void m();
};

NonPOD fNonPOD(NonPOD s) { return s; }

template <unsigned size>
struct TS {
    char x[size];
};

template <unsigned size>
void tf(TS<size> ts) {} // expected-warning {{ts' is a large (300 bytes) pass-by-value argument}}

void g() {
    TS<300> ts;
    tf<300>(ts); // expected-note {{instantiation}}
}

}

template<typename T> class DependentPOD {
  enum b { x };
  b foo() { return x; }
};