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f276e2dc46
The "casts away constness" check doesn't care at all how the different layers of the source and destination type were formed: for example, if the source is a pointer and the destination is a pointer-to-member, the types are still decomposed and their pointee qualifications are still checked. This rule is bizarre and somewhat ridiculous, so as an extension we accept code making use of such reinterpret_casts with a warning outside of SFINAE contexts. llvm-svn: 336738
65 lines
2.9 KiB
C
65 lines
2.9 KiB
C
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -Wcast-qual -verify %s
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -x c++ -fsyntax-only -Wcast-qual -verify %s
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#include <stdint.h>
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void foo() {
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const char *const ptr = 0;
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const char *const *ptrptr = 0;
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char *const *ptrcptr = 0;
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char **ptrptr2 = 0;
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char *y = (char *)ptr; // expected-warning {{cast from 'const char *' to 'char *' drops const qualifier}}
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char **y1 = (char **)ptrptr; // expected-warning {{cast from 'const char *const *' to 'char **' drops const qualifier}}
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const char **y2 = (const char **)ptrptr; // expected-warning {{cast from 'const char *const *' to 'const char **' drops const qualifier}}
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char *const *y3 = (char *const *)ptrptr; // expected-warning {{cast from 'const char *const' to 'char *const' drops const qualifier}}
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const char **y4 = (const char **)ptrcptr; // expected-warning {{cast from 'char *const *' to 'const char **' drops const qualifier}}
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char *z = (char *)(uintptr_t)(const void *)ptr; // no warning
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char *z1 = (char *)(const void *)ptr; // expected-warning {{cast from 'const void *' to 'char *' drops const qualifier}}
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volatile char *vol = 0;
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char *vol2 = (char *)vol; // expected-warning {{cast from 'volatile char *' to 'char *' drops volatile qualifier}}
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const volatile char *volc = 0;
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char *volc2 = (char *)volc; // expected-warning {{cast from 'const volatile char *' to 'char *' drops const and volatile qualifiers}}
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int **intptrptr;
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const int **intptrptrc = (const int **)intptrptr; // expected-warning {{cast from 'int **' to 'const int **' must have all intermediate pointers const qualified}}
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volatile int **intptrptrv = (volatile int **)intptrptr; // expected-warning {{cast from 'int **' to 'volatile int **' must have all intermediate pointers const qualified}}
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int *intptr;
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const int *intptrc = (const int *)intptr; // no warning
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const char **charptrptrc;
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char **charptrptr = (char **)charptrptrc; // expected-warning {{cast from 'const char *' to 'char *' drops const qualifier}}
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const char *constcharptr;
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char *charptr = (char *)constcharptr; // expected-warning {{cast from 'const char *' to 'char *' drops const qualifier}}
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const char *constcharptr2 = (char *)constcharptr; // expected-warning {{cast from 'const char *' to 'char *' drops const qualifier}}
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const char *charptr2 = (char *)charptr; // no warning
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}
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void bar_0() {
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struct C {
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const int a;
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int b;
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};
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const struct C S = {0, 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; // expected-warning {{cast from 'const int *' to 'int *' drops const qualifier}}
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}
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void bar_1() {
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struct C {
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const int a;
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int b;
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};
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struct C S = {0, 0};
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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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