derek.holloway
7502bf64a4
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141 lines
6.7 KiB
C++
141 lines
6.7 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -Wcast-qual -verify %s
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#include <stdint.h>
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// do *NOT* warn on const_cast<>()
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// use clang-tidy's cppcoreguidelines-pro-type-const-cast for that.
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void foo_ptr() {
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const char *const ptr = 0;
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char *t0 = const_cast<char *>(ptr); // no warning
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volatile char *ptr2 = 0;
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char *t1 = const_cast<char *>(ptr2); // no warning
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const volatile char *ptr3 = 0;
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char *t2 = const_cast<char *>(ptr3); // no warning
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}
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void cstr() {
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void* p0 = (void*)(const void*)"txt"; // expected-warning {{cast from 'const void *' to 'void *' drops const qualifier}}
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void* p1 = (void*)"txt"; // FIXME
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char* p2 = (char*)"txt"; // expected-warning {{cast from 'const char *' to 'char *' drops const qualifier}}
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}
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void foo_0() {
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const int a = 0;
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const int &a0 = a; // no warning
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const int &a1 = (const int &)a; // no warning
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int &a2 = (int &)a; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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const int &a3 = (int &)a; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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int &a4 = (int &)((const int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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int &a5 = (int &)((int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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const int &a6 = (int &)((int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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const int &a7 = (int &)((const int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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const int &a8 = (const int &)((int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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}
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void foo_1() {
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volatile int a = 0;
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volatile int &a0 = a; // no warning
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volatile int &a1 = (volatile int &)a; // no warning
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int &a2 = (int &)a; // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
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volatile int &a3 = (int &)a; // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
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int &a4 = (int &)((volatile int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
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int &a5 = (int &)((int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
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volatile int &a6 = (int &)((int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
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volatile int &a7 = (int &)((volatile int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
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volatile int &a8 = (volatile int &)((int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}}
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}
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void foo_2() {
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const volatile int a = 0;
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const volatile int &a0 = a; // no warning
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const volatile int &a1 = (const volatile int &)a; // no warning
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int &a2 = (int &)a; // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
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const volatile int &a3 = (int &)a; // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
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int &a4 = (int &)((const volatile int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
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int &a5 = (int &)((int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
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const volatile int &a6 = (int &)((int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
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const volatile int &a7 = (int &)((const volatile int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
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const volatile int &a8 = (const volatile int &)((int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}}
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}
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void bar_0() {
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const int *_a = 0;
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const int **a = &_a;
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int **a0 = (int **)((const int **)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
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int **a1 = (int **)((int **)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
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// const int **a2 = (int **)((int **)a);
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// const int **a3 = (int **)((const int **)a);
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const int **a4 = (const int **)((int **)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} expected-warning {{cast from 'int **' to 'const int **' must have all intermediate pointers const qualified to be safe}}
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const int **a5 = (const int **)((const int **)a); // no warning
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}
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void bar_1() {
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const int *_a = 0;
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const int *&a = _a;
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int *&a0 = (int *&)((const int *&)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
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int *&a1 = (int *&)((int *&)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
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// const int *&a2 = (int *&)((int *&)a);
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// const int *&a3 = (int *&)((const int *&)a);
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const int *&a4 = (const int *&)((int *&)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} expected-warning {{cast from 'int *' to 'const int *&' must have all intermediate pointers const qualified to be safe}}
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const int *&a5 = (const int *&)((const int *&)a); // no warning
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}
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void baz_0() {
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struct C {
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void A() {}
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void B() const {}
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};
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const C S;
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S.B();
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((C &)S).B(); // expected-warning {{cast from 'const C' to 'C &' drops const qualifier}}
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((C &)S).A(); // expected-warning {{cast from 'const C' to 'C &' drops const qualifier}}
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((C *)&S)->B(); // expected-warning {{cast from 'const C *' to 'C *' drops const qualifier}}
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((C *)&S)->A(); // expected-warning {{cast from 'const C *' to 'C *' drops const qualifier}}
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}
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void baz_1() {
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struct C {
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const int a;
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int b;
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C() : a(0) {}
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};
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{
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C S;
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S.b = 0;
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(int &)(S.a) = 0; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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(int &)(S.b) = 0; // no warning
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*(int *)(&S.a) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
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*(int *)(&S.b) = 0; // no warning
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}
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{
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const C S;
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(int &)(S.a) = 0; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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(int &)(S.b) = 0; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}}
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*(int *)(&S.a) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
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*(int *)(&S.b) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
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}
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}
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