1// RUN: %check_clang_tidy -check-suffixes=ALL,C -std=c99 %s bugprone-implicit-widening-of-multiplication-result %t -- -- -target x86_64-unknown-unknown -x c
2// RUN: %check_clang_tidy -check-suffixes=ALL,CXX %s bugprone-implicit-widening-of-multiplication-result %t -- -- -target x86_64-unknown-unknown -x c++
3
4// RUN: %check_clang_tidy -check-suffixes=ALL,C -std=c99 %s bugprone-implicit-widening-of-multiplication-result %t -- \
5// RUN: -config='{CheckOptions: { \
6// RUN: bugprone-implicit-widening-of-multiplication-result.UseCXXStaticCastsInCppSources: false \
7// RUN: }}' -- -target x86_64-unknown-unknown -x c
8// RUN: %check_clang_tidy -check-suffixes=ALL,C %s bugprone-implicit-widening-of-multiplication-result %t -- \
9// RUN: -config='{CheckOptions: { \
10// RUN: bugprone-implicit-widening-of-multiplication-result.UseCXXStaticCastsInCppSources: false \
11// RUN: }}' -- -target x86_64-unknown-unknown -x c++
12
13char *t0(char *base, int a, int b) {
14 return &base[a * b];
15 // CHECK-NOTES-ALL: :[[@LINE-1]]:11: warning: result of multiplication in type 'int' is used as a pointer offset after an implicit widening conversion to type 'ptrdiff_t'
16 // CHECK-NOTES-ALL: :[[@LINE-2]]:16: note: make conversion explicit to silence this warning
17 // CHECK-NOTES-C: (ptrdiff_t)( )
18 // CHECK-NOTES-CXX: static_cast<ptrdiff_t>( )
19 // CHECK-NOTES-ALL: :[[@LINE-5]]:16: note: perform multiplication in a wider type
20 // CHECK-NOTES-C: (ptrdiff_t)
21 // CHECK-NOTES-CXX: static_cast<ptrdiff_t>( )
22}
23void *t1(char *base, int a, int b) {
24 return &((a * b)[base]);
25 // CHECK-NOTES-ALL: :[[@LINE-1]]:12: warning: result of multiplication in type 'int' is used as a pointer offset after an implicit widening conversion to type 'ptrdiff_t'
26 // CHECK-NOTES-ALL: :[[@LINE-2]]:13: note: make conversion explicit to silence this warning
27 // CHECK-NOTES-ALL: :[[@LINE-3]]:13: note: perform multiplication in a wider type
28}
29
30char *t2(char *base, unsigned int a, int b) {
31 return &base[a * b];
32 // CHECK-NOTES-ALL: :[[@LINE-1]]:11: warning: result of multiplication in type 'unsigned int' is used as a pointer offset after an implicit widening conversion to type 'size_t'
33 // CHECK-NOTES-ALL: :[[@LINE-2]]:16: note: make conversion explicit to silence this warning
34 // CHECK-NOTES-C: (size_t)
35 // CHECK-NOTES-CXX: static_cast<size_t>( )
36 // CHECK-NOTES-ALL: :[[@LINE-5]]:16: note: perform multiplication in a wider type
37 // CHECK-NOTES-C: (size_t)
38 // CHECK-NOTES-CXX: static_cast<size_t>( )
39}
40
41char *t3(char *base, int a, unsigned int b) {
42 return &base[a * b];
43 // CHECK-NOTES-ALL: :[[@LINE-1]]:11: warning: result of multiplication in type 'unsigned int' is used as a pointer offset after an implicit widening conversion to type 'size_t'
44 // CHECK-NOTES-ALL: :[[@LINE-2]]:16: note: make conversion explicit to silence this warning
45 // CHECK-NOTES-ALL: :[[@LINE-3]]:16: note: perform multiplication in a wider type
46}
47
48char *t4(char *base, unsigned int a, unsigned int b) {
49 return &base[a * b];
50 // CHECK-NOTES-ALL: :[[@LINE-1]]:11: warning: result of multiplication in type 'unsigned int' is used as a pointer offset after an implicit widening conversion to type 'size_t'
51 // CHECK-NOTES-ALL: :[[@LINE-2]]:16: note: make conversion explicit to silence this warning
52 // CHECK-NOTES-ALL: :[[@LINE-3]]:16: note: perform multiplication in a wider type
53}
54
55char *n5(char *base, int a, int b, int c) {
56 return &base[a * b + c];
57}
58char *n6(char *base, int a, int b, int c) {
59 return &base[a + b * c];
60}
61
62char *t7(char *base, int a, int b) {
63 return &base[(a * b)];
64 // CHECK-NOTES-ALL: :[[@LINE-1]]:11: warning: result of multiplication in type 'int' is used as a pointer offset after an implicit widening conversion to type 'ptrdiff_t'
65 // CHECK-NOTES-ALL: :[[@LINE-2]]:17: note: make conversion explicit to silence this warning
66 // CHECK-NOTES-ALL: :[[@LINE-3]]:17: note: perform multiplication in a wider type
67}
68char *n8(char *base, int a, int b, int c) {
69 return &base[(a * b + c)];
70}
71char *n9(char *base, int a, int b, int c) {
72 return &base[(a * b) + c];
73}
74
75char *n10(char *base, int a, int b) {
76 return &base[(long)(a * b)];
77}
78char *n11(char *base, int a, int b) {
79 return &base[(unsigned long)(a * b)];
80}
81
82#ifdef __cplusplus
83template <typename T>
84char *template_test(char *base, T a, T b) {
85 return &base[a * b];
86}
87char *template_test_instantiation(char *base, int a, int b) {
88 return template_test(base, a, b);
89}
90#endif
91

source code of clang-tools-extra/test/clang-tidy/checkers/bugprone/implicit-widening-of-multiplication-result-array-subscript-expression.cpp