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-rw-r--r--test/SemaCXX/warn-cast-qual.cpp140
1 files changed, 140 insertions, 0 deletions
diff --git a/test/SemaCXX/warn-cast-qual.cpp b/test/SemaCXX/warn-cast-qual.cpp
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index 0000000000000..d1f0cc73a63d4
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+++ 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}}
+ }
+}