52 lines · cpp
1// RUN: %clang_cc1 -std=c++20 -Wunsafe-buffer-usage -fsafe-buffer-usage-suggestions -verify %s2 3void lhs_span_multi_assign() {4 int *a = new int[2];5 int *b = a;6 int *c = b;7 int *d = c; // expected-warning{{'d' is an unsafe pointer used for buffer access}} expected-note{{change type of 'd' to 'std::span' to preserve bounds information, and change 'c', 'b', and 'a' to 'std::span' to propagate bounds information between them}}8 int tmp = d[2]; // expected-note{{used in buffer access here}}9}10 11void rhs_span1() {12 int *q = new int[12];13 int *p = q; // expected-warning{{'p' is an unsafe pointer used for buffer access}} expected-note{{change type of 'p' to 'std::span' to preserve bounds information, and change 'q' and 'r' to 'std::span' to propagate bounds information between them}}14 p[5] = 10; // expected-note{{used in buffer access here}}15 int *r = q; // expected-warning{{'r' is an unsafe pointer used for buffer access}} expected-note{{change type of 'r' to 'std::span' to preserve bounds information, and change 'p' and 'q' to 'std::span' to propagate bounds information between them}}16 r[10] = 5; // expected-note{{used in buffer access here}}17}18 19void rhs_span2() {20 int *q = new int[6];21 int *p = q; // expected-warning{{'p' is an unsafe pointer used for buffer access}} expected-note{{change type of 'p' to 'std::span' to preserve bounds information, and change 'q' to 'std::span' to propagate bounds information between them}}22 p[5] = 10; // expected-note{{used in buffer access here}}23}24 25// FIXME: Suggest fixits for p, q, and r since span a valid fixit for r.26void rhs_span3() {27 int *q = new int[6];28 int *p = q; // expected-warning{{'p' is an unsafe pointer used for buffer access}}29 p[5] = 10; // expected-note{{used in buffer access here}}30 int *r = q; // FIXME: we do not fix `int *r = q` here as the `.data()` fix-it is not generally correct31}32 33void test_grouping() {34 int *z = new int[8];35 int tmp;36 int *y = new int[10]; // expected-warning{{'y' is an unsafe pointer used for buffer access}}37 tmp = y[5]; // expected-note{{used in buffer access here}}38 39 int *x = new int[10];40 x = y; // FIXME: we do not fix `x = y` here as the `.data()` fix-it is not generally correct41 42 int *w = z;43}44 45void test_crash() {46 int *r = new int[8];47 int *q = r;48 int *p; // expected-warning{{'p' is an unsafe pointer used for buffer access}} expected-note{{change type of 'p' to 'std::span' to preserve bounds information, and change 'q' and 'r' to 'std::span' to propagate bounds information between them}}49 p = q;50 int tmp = p[9]; // expected-note{{used in buffer access here}}51}52