1 | // RUN: %clang_analyze_cc1 -Wno-unused -std=c++11 -analyzer-checker=core,debug.ExprInspection -verify %s |
2 | // RUN: %clang_analyze_cc1 -Wno-unused -std=c++17 -analyzer-checker=core,debug.ExprInspection -verify %s |
3 | // RUN: %clang_analyze_cc1 -Wno-unused -std=c++11 -analyzer-checker=core,debug.ExprInspection -DMOVES -verify %s |
4 | // RUN: %clang_analyze_cc1 -Wno-unused -std=c++17 -analyzer-checker=core,debug.ExprInspection -DMOVES -verify %s |
5 | |
6 | void clang_analyzer_eval(bool); |
7 | void clang_analyzer_checkInlined(bool); |
8 | |
9 | template <typename T> struct AddressVector { |
10 | T *buf[10]; |
11 | int len; |
12 | |
13 | AddressVector() : len(0) {} |
14 | |
15 | void push(T *t) { |
16 | buf[len] = t; |
17 | ++len; |
18 | } |
19 | }; |
20 | |
21 | class C { |
22 | AddressVector<C> &v; |
23 | |
24 | public: |
25 | C(AddressVector<C> &v) : v(v) { v.push(this); } |
26 | ~C() { v.push(this); } |
27 | |
28 | #ifdef MOVES |
29 | C(C &&c) : v(c.v) { v.push(this); } |
30 | #endif |
31 | |
32 | // Note how return-statements prefer move-constructors when available. |
33 | C(const C &c) : v(c.v) { |
34 | #ifdef MOVES |
35 | clang_analyzer_checkInlined(false); // no-warning |
36 | #else |
37 | v.push(this); |
38 | #endif |
39 | } // no-warning |
40 | }; |
41 | |
42 | @interface NSObject {} |
43 | @end; |
44 | @interface Foo: NSObject {} |
45 | -(C) make: (AddressVector<C> &)v; |
46 | @end |
47 | |
48 | @implementation Foo |
49 | -(C) make: (AddressVector<C> &)v { |
50 | return C(v); |
51 | } |
52 | @end |
53 | |
54 | void testReturnByValueFromMessage(Foo *foo) { |
55 | AddressVector<C> v; |
56 | { |
57 | const C &c = [foo make: v]; |
58 | } |
59 | // 0. Construct the return value of -make (copy/move elided) and |
60 | // lifetime-extend it directly via reference 'c', |
61 | // 1. Destroy the temporary lifetime-extended by 'c'. |
62 | clang_analyzer_eval(v.len == 2); // expected-warning{{TRUE}} |
63 | clang_analyzer_eval(v.buf[0] == v.buf[1]); // expected-warning{{TRUE}} |
64 | } |
65 | |