91 lines · cpp
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 c2// 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 c8// 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 warning17 // 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 type20 // 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 warning27 // CHECK-NOTES-ALL: :[[@LINE-3]]:13: note: perform multiplication in a wider type28}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 warning34 // 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 type37 // 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 warning45 // CHECK-NOTES-ALL: :[[@LINE-3]]:16: note: perform multiplication in a wider type46}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 warning52 // CHECK-NOTES-ALL: :[[@LINE-3]]:16: note: perform multiplication in a wider type53}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 warning66 // CHECK-NOTES-ALL: :[[@LINE-3]]:17: note: perform multiplication in a wider type67}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 __cplusplus83template <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#endif91