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Diffstat (limited to 'test/SemaCXX/warn-cast-qual.cpp')
-rw-r--r-- | test/SemaCXX/warn-cast-qual.cpp | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/test/SemaCXX/warn-cast-qual.cpp b/test/SemaCXX/warn-cast-qual.cpp new file mode 100644 index 0000000000000..d1f0cc73a63d4 --- /dev/null +++ b/test/SemaCXX/warn-cast-qual.cpp @@ -0,0 +1,140 @@ +// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -Wcast-qual -verify %s + +#include <stdint.h> + +// do *NOT* warn on const_cast<>() +// use clang-tidy's cppcoreguidelines-pro-type-const-cast for that. +void foo_ptr() { + const char *const ptr = 0; + char *t0 = const_cast<char *>(ptr); // no warning + + volatile char *ptr2 = 0; + char *t1 = const_cast<char *>(ptr2); // no warning + + const volatile char *ptr3 = 0; + char *t2 = const_cast<char *>(ptr3); // no warning +} + +void cstr() { + void* p0 = (void*)(const void*)"txt"; // expected-warning {{cast from 'const void *' to 'void *' drops const qualifier}} + void* p1 = (void*)"txt"; // FIXME + char* p2 = (char*)"txt"; // expected-warning {{cast from 'const char *' to 'char *' drops const qualifier}} +} + +void foo_0() { + const int a = 0; + + const int &a0 = a; // no warning + const int &a1 = (const int &)a; // no warning + + int &a2 = (int &)a; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} + const int &a3 = (int &)a; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} + int &a4 = (int &)((const int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} + int &a5 = (int &)((int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} + const int &a6 = (int &)((int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} + const int &a7 = (int &)((const int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} + const int &a8 = (const int &)((int &)a); // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} +} + +void foo_1() { + volatile int a = 0; + + volatile int &a0 = a; // no warning + volatile int &a1 = (volatile int &)a; // no warning + + int &a2 = (int &)a; // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}} + volatile int &a3 = (int &)a; // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}} + int &a4 = (int &)((volatile int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}} + int &a5 = (int &)((int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}} + volatile int &a6 = (int &)((int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}} + volatile int &a7 = (int &)((volatile int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}} + volatile int &a8 = (volatile int &)((int &)a); // expected-warning {{cast from 'volatile int' to 'int &' drops volatile qualifier}} +} + +void foo_2() { + const volatile int a = 0; + + const volatile int &a0 = a; // no warning + const volatile int &a1 = (const volatile int &)a; // no warning + + int &a2 = (int &)a; // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}} + const volatile int &a3 = (int &)a; // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}} + int &a4 = (int &)((const volatile int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}} + int &a5 = (int &)((int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}} + const volatile int &a6 = (int &)((int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}} + const volatile int &a7 = (int &)((const volatile int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}} + const volatile int &a8 = (const volatile int &)((int &)a); // expected-warning {{cast from 'const volatile int' to 'int &' drops const and volatile qualifiers}} +} + +void bar_0() { + const int *_a = 0; + const int **a = &_a; + + int **a0 = (int **)((const int **)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} + int **a1 = (int **)((int **)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} + + // const int **a2 = (int **)((int **)a); + // const int **a3 = (int **)((const int **)a); + + 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}} + const int **a5 = (const int **)((const int **)a); // no warning +} + +void bar_1() { + const int *_a = 0; + const int *&a = _a; + + int *&a0 = (int *&)((const int *&)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} + int *&a1 = (int *&)((int *&)a); // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} + + // const int *&a2 = (int *&)((int *&)a); + // const int *&a3 = (int *&)((const int *&)a); + + 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}} + const int *&a5 = (const int *&)((const int *&)a); // no warning +} + +void baz_0() { + struct C { + void A() {} + void B() const {} + }; + + const C S; + S.B(); + + ((C &)S).B(); // expected-warning {{cast from 'const C' to 'C &' drops const qualifier}} + ((C &)S).A(); // expected-warning {{cast from 'const C' to 'C &' drops const qualifier}} + + ((C *)&S)->B(); // expected-warning {{cast from 'const C *' to 'C *' drops const qualifier}} + ((C *)&S)->A(); // expected-warning {{cast from 'const C *' to 'C *' drops const qualifier}} +} + +void baz_1() { + struct C { + const int a; + int b; + + C() : a(0) {} + }; + + { + C S; + S.b = 0; + + (int &)(S.a) = 0; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} + (int &)(S.b) = 0; // no warning + + *(int *)(&S.a) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} + *(int *)(&S.b) = 0; // no warning + } + { + const C S; + + (int &)(S.a) = 0; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} + (int &)(S.b) = 0; // expected-warning {{cast from 'const int' to 'int &' drops const qualifier}} + + *(int *)(&S.a) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} + *(int *)(&S.b) = 0; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}} + } +} |