292 lines
11 KiB
C++
292 lines
11 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -ffreestanding -Wundefined-reinterpret-cast -Wno-unused-volatile-lvalue %s
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#include <stdint.h>
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enum test { testval = 1 };
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struct structure { int m; };
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typedef void (*fnptr)();
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// Test the conversion to self.
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void self_conversion()
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{
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// T->T is allowed per [expr.reinterpret.cast]p2 so long as it doesn't
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// cast away constness, and is integral, enumeration, pointer or
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// pointer-to-member.
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int i = 0;
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(void)reinterpret_cast<int>(i);
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test e = testval;
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(void)reinterpret_cast<test>(e);
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// T*->T* is allowed
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int *pi = 0;
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(void)reinterpret_cast<int*>(pi);
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const int structure::*psi = 0;
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(void)reinterpret_cast<const int structure::*>(psi);
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structure s;
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(void)reinterpret_cast<structure>(s); // expected-error {{reinterpret_cast from 'structure' to 'structure' is not allowed}}
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float f = 0.0f;
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(void)reinterpret_cast<float>(f); // expected-error {{reinterpret_cast from 'float' to 'float' is not allowed}}
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}
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// Test conversion between pointer and integral types, as in /3 and /4.
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void integral_conversion()
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{
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void *vp = reinterpret_cast<void*>(testval);
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intptr_t i = reinterpret_cast<intptr_t>(vp);
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(void)reinterpret_cast<float*>(i);
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fnptr fnp = reinterpret_cast<fnptr>(i);
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(void)reinterpret_cast<char>(fnp); // expected-error {{cast from pointer to smaller type 'char' loses information}}
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(void)reinterpret_cast<intptr_t>(fnp);
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}
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void pointer_conversion()
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{
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int *p1 = 0;
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float *p2 = reinterpret_cast<float*>(p1);
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structure *p3 = reinterpret_cast<structure*>(p2);
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typedef int **ppint;
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ppint *deep = reinterpret_cast<ppint*>(p3);
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(void)reinterpret_cast<fnptr*>(deep);
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}
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void constness()
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{
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int ***const ipppc = 0;
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// Valid: T1* -> T2 const*
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int const *icp = reinterpret_cast<int const*>(ipppc);
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// Invalid: T1 const* -> T2*
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(void)reinterpret_cast<int*>(icp); // expected-error {{reinterpret_cast from 'const int *' to 'int *' casts away qualifiers}}
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// Invalid: T1*** -> T2 const* const**
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int const *const **icpcpp = reinterpret_cast<int const* const**>(ipppc); // expected-error {{reinterpret_cast from 'int ***' to 'const int *const **' casts away qualifiers}}
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// Valid: T1* -> T2*
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int *ip = reinterpret_cast<int*>(icpcpp);
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// Valid: T* -> T const*
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(void)reinterpret_cast<int const*>(ip);
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// Valid: T*** -> T2 const* const* const*
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(void)reinterpret_cast<int const* const* const*>(ipppc);
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}
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void fnptrs()
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{
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typedef int (*fnptr2)(int);
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fnptr fp = 0;
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(void)reinterpret_cast<fnptr2>(fp);
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void *vp = reinterpret_cast<void*>(fp);
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(void)reinterpret_cast<fnptr>(vp);
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}
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void refs()
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{
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long l = 0;
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char &c = reinterpret_cast<char&>(l);
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// Bad: from rvalue
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(void)reinterpret_cast<int&>(&c); // expected-error {{reinterpret_cast from rvalue to reference type 'int &'}}
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}
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void memptrs()
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{
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const int structure::*psi = 0;
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(void)reinterpret_cast<const float structure::*>(psi);
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(void)reinterpret_cast<int structure::*>(psi); // expected-error {{reinterpret_cast from 'const int structure::*' to 'int structure::*' casts away qualifiers}}
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void (structure::*psf)() = 0;
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(void)reinterpret_cast<int (structure::*)()>(psf);
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(void)reinterpret_cast<void (structure::*)()>(psi); // expected-error {{reinterpret_cast from 'const int structure::*' to 'void (structure::*)()' is not allowed}}
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(void)reinterpret_cast<int structure::*>(psf); // expected-error {{reinterpret_cast from 'void (structure::*)()' to 'int structure::*' is not allowed}}
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// Cannot cast from integers to member pointers, not even the null pointer
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// literal.
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(void)reinterpret_cast<void (structure::*)()>(0); // expected-error {{reinterpret_cast from 'int' to 'void (structure::*)()' is not allowed}}
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(void)reinterpret_cast<int structure::*>(0); // expected-error {{reinterpret_cast from 'int' to 'int structure::*' is not allowed}}
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}
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namespace PR5545 {
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// PR5545
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class A;
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class B;
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void (A::*a)();
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void (B::*b)() = reinterpret_cast<void (B::*)()>(a);
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}
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// <rdar://problem/8018292>
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void const_arrays() {
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typedef char STRING[10];
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const STRING *s;
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const char *c;
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(void)reinterpret_cast<char *>(s); // expected-error {{reinterpret_cast from 'const STRING *' (aka 'char const (*)[10]') to 'char *' casts away qualifiers}}
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(void)reinterpret_cast<const STRING *>(c);
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}
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namespace PR9564 {
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struct a { int a : 10; }; a x;
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int *y = &reinterpret_cast<int&>(x.a); // expected-error {{not allowed}}
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__attribute((ext_vector_type(4))) typedef float v4;
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float& w(v4 &a) { return reinterpret_cast<float&>(a[1]); } // expected-error {{not allowed}}
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}
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void dereference_reinterpret_cast() {
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struct A {};
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typedef A A2;
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class B {};
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typedef B B2;
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A a;
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B b;
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A2 a2;
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B2 b2;
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long l;
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double d;
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float f;
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char c;
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unsigned char uc;
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void* v_ptr;
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(void)reinterpret_cast<double&>(l); // expected-warning {{reinterpret_cast from 'long' to 'double &' has undefined behavior}}
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(void)*reinterpret_cast<double*>(&l); // expected-warning {{dereference of type 'double *' that was reinterpret_cast from type 'long *' has undefined behavior}}
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(void)reinterpret_cast<double&>(f); // expected-warning {{reinterpret_cast from 'float' to 'double &' has undefined behavior}}
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(void)*reinterpret_cast<double*>(&f); // expected-warning {{dereference of type 'double *' that was reinterpret_cast from type 'float *' has undefined behavior}}
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(void)reinterpret_cast<float&>(l); // expected-warning {{reinterpret_cast from 'long' to 'float &' has undefined behavior}}
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(void)*reinterpret_cast<float*>(&l); // expected-warning {{dereference of type 'float *' that was reinterpret_cast from type 'long *' has undefined behavior}}
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(void)reinterpret_cast<float&>(d); // expected-warning {{reinterpret_cast from 'double' to 'float &' has undefined behavior}}
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(void)*reinterpret_cast<float*>(&d); // expected-warning {{dereference of type 'float *' that was reinterpret_cast from type 'double *' has undefined behavior}}
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// TODO: add warning for tag types
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(void)reinterpret_cast<A&>(b);
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(void)*reinterpret_cast<A*>(&b);
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(void)reinterpret_cast<B&>(a);
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(void)*reinterpret_cast<B*>(&a);
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(void)reinterpret_cast<A2&>(b2);
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(void)*reinterpret_cast<A2*>(&b2);
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(void)reinterpret_cast<B2&>(a2);
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(void)*reinterpret_cast<B2*>(&a2);
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// Casting to itself is allowed
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(void)reinterpret_cast<A&>(a);
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(void)*reinterpret_cast<A*>(&a);
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(void)reinterpret_cast<B&>(b);
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(void)*reinterpret_cast<B*>(&b);
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(void)reinterpret_cast<long&>(l);
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(void)*reinterpret_cast<long*>(&l);
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(void)reinterpret_cast<double&>(d);
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(void)*reinterpret_cast<double*>(&d);
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(void)reinterpret_cast<char&>(c);
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(void)*reinterpret_cast<char*>(&c);
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// Casting to and from chars are allowable
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(void)reinterpret_cast<A&>(c);
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(void)*reinterpret_cast<A*>(&c);
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(void)reinterpret_cast<B&>(c);
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(void)*reinterpret_cast<B*>(&c);
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(void)reinterpret_cast<long&>(c);
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(void)*reinterpret_cast<long*>(&c);
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(void)reinterpret_cast<double&>(c);
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(void)*reinterpret_cast<double*>(&c);
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(void)reinterpret_cast<char&>(l);
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(void)*reinterpret_cast<char*>(&l);
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(void)reinterpret_cast<char&>(d);
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(void)*reinterpret_cast<char*>(&d);
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(void)reinterpret_cast<char&>(f);
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(void)*reinterpret_cast<char*>(&f);
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// Casting from void pointer.
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(void)*reinterpret_cast<A*>(v_ptr);
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(void)*reinterpret_cast<B*>(v_ptr);
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(void)*reinterpret_cast<long*>(v_ptr);
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(void)*reinterpret_cast<double*>(v_ptr);
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(void)*reinterpret_cast<float*>(v_ptr);
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// Casting to void pointer
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(void)*reinterpret_cast<void*>(&a);
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(void)*reinterpret_cast<void*>(&b);
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(void)*reinterpret_cast<void*>(&l);
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(void)*reinterpret_cast<void*>(&d);
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(void)*reinterpret_cast<void*>(&f);
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}
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void reinterpret_cast_whitelist () {
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// the dynamic type of the object
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int a;
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float b;
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(void)reinterpret_cast<int&>(a);
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(void)*reinterpret_cast<int*>(&a);
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(void)reinterpret_cast<float&>(b);
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(void)*reinterpret_cast<float*>(&b);
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// a cv-qualified version of the dynamic object
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(void)reinterpret_cast<const int&>(a);
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(void)*reinterpret_cast<const int*>(&a);
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(void)reinterpret_cast<volatile int&>(a);
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(void)*reinterpret_cast<volatile int*>(&a);
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(void)reinterpret_cast<const volatile int&>(a);
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(void)*reinterpret_cast<const volatile int*>(&a);
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(void)reinterpret_cast<const float&>(b);
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(void)*reinterpret_cast<const float*>(&b);
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(void)reinterpret_cast<volatile float&>(b);
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(void)*reinterpret_cast<volatile float*>(&b);
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(void)reinterpret_cast<const volatile float&>(b);
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(void)*reinterpret_cast<const volatile float*>(&b);
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// a type that is the signed or unsigned type corresponding to the dynamic
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// type of the object
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signed d;
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unsigned e;
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(void)reinterpret_cast<signed&>(d);
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(void)*reinterpret_cast<signed*>(&d);
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(void)reinterpret_cast<signed&>(e);
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(void)*reinterpret_cast<signed*>(&e);
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(void)reinterpret_cast<unsigned&>(d);
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(void)*reinterpret_cast<unsigned*>(&d);
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(void)reinterpret_cast<unsigned&>(e);
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(void)*reinterpret_cast<unsigned*>(&e);
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// a type that is the signed or unsigned type corresponding a cv-qualified
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// version of the dynamic type the object
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(void)reinterpret_cast<const signed&>(d);
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(void)*reinterpret_cast<const signed*>(&d);
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(void)reinterpret_cast<const signed&>(e);
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(void)*reinterpret_cast<const signed*>(&e);
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(void)reinterpret_cast<const unsigned&>(d);
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(void)*reinterpret_cast<const unsigned*>(&d);
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(void)reinterpret_cast<const unsigned&>(e);
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(void)*reinterpret_cast<const unsigned*>(&e);
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(void)reinterpret_cast<volatile signed&>(d);
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(void)*reinterpret_cast<volatile signed*>(&d);
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(void)reinterpret_cast<volatile signed&>(e);
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(void)*reinterpret_cast<volatile signed*>(&e);
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(void)reinterpret_cast<volatile unsigned&>(d);
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(void)*reinterpret_cast<volatile unsigned*>(&d);
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(void)reinterpret_cast<volatile unsigned&>(e);
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(void)*reinterpret_cast<volatile unsigned*>(&e);
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(void)reinterpret_cast<const volatile signed&>(d);
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(void)*reinterpret_cast<const volatile signed*>(&d);
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(void)reinterpret_cast<const volatile signed&>(e);
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(void)*reinterpret_cast<const volatile signed*>(&e);
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(void)reinterpret_cast<const volatile unsigned&>(d);
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(void)*reinterpret_cast<const volatile unsigned*>(&d);
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(void)reinterpret_cast<const volatile unsigned&>(e);
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(void)*reinterpret_cast<const volatile unsigned*>(&e);
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// an aggregate or union type that includes one of the aforementioned types
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// among its members (including, recursively, a member of a subaggregate or
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// contained union)
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// TODO: checking is not implemented for tag types
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// a type that is a (possible cv-qualified) base class type of the dynamic
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// type of the object
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// TODO: checking is not implemented for tag types
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// a char or unsigned char type
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(void)reinterpret_cast<char&>(a);
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(void)*reinterpret_cast<char*>(&a);
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(void)reinterpret_cast<unsigned char&>(a);
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(void)*reinterpret_cast<unsigned char*>(&a);
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(void)reinterpret_cast<char&>(b);
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(void)*reinterpret_cast<char*>(&b);
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(void)reinterpret_cast<unsigned char&>(b);
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(void)*reinterpret_cast<unsigned char*>(&b);
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}
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