Merge branch 'master' of ssh://bitbucket.org/czan/honours

1 files changed, 292 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/reinterpret-cast.cpp b/clang/test/SemaCXX/reinterpret-cast.cpp
new file mode 100644
index 0000000..7f41b93
--- /dev/null
+++ b/clang/test/SemaCXX/reinterpret-cast.cpp
@@ -0,0 +1,292 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -ffreestanding -Wundefined-reinterpret-cast %s
+
+#include <stdint.h>
+
+enum test { testval = 1 };
+struct structure { int m; };
+typedef void (*fnptr)();
+
+// Test the conversion to self.
+void self_conversion()
+{
+  // T->T is allowed per [expr.reinterpret.cast]p2 so long as it doesn't
+  // cast away constness, and is integral, enumeration, pointer or 
+  // pointer-to-member.
+  int i = 0;
+  (void)reinterpret_cast<int>(i);
+
+  test e = testval;
+  (void)reinterpret_cast<test>(e);
+
+  // T*->T* is allowed
+  int *pi = 0;
+  (void)reinterpret_cast<int*>(pi);
+
+  const int structure::*psi = 0;
+  (void)reinterpret_cast<const int structure::*>(psi);
+
+  structure s;
+  (void)reinterpret_cast<structure>(s); // expected-error {{reinterpret_cast from 'structure' to 'structure' is not allowed}}
+
+  float f = 0.0f;
+  (void)reinterpret_cast<float>(f); // expected-error {{reinterpret_cast from 'float' to 'float' is not allowed}}
+}
+
+// Test conversion between pointer and integral types, as in /3 and /4.
+void integral_conversion()
+{
+  void *vp = reinterpret_cast<void*>(testval);
+  intptr_t i = reinterpret_cast<intptr_t>(vp);
+  (void)reinterpret_cast<float*>(i);
+  fnptr fnp = reinterpret_cast<fnptr>(i);
+  (void)reinterpret_cast<char>(fnp); // expected-error {{cast from pointer to smaller type 'char' loses information}}
+  (void)reinterpret_cast<intptr_t>(fnp);
+}
+
+void pointer_conversion()
+{
+  int *p1 = 0;
+  float *p2 = reinterpret_cast<float*>(p1);
+  structure *p3 = reinterpret_cast<structure*>(p2);
+  typedef int **ppint;
+  ppint *deep = reinterpret_cast<ppint*>(p3);
+  (void)reinterpret_cast<fnptr*>(deep);
+}
+
+void constness()
+{
+  int ***const ipppc = 0;
+  // Valid: T1* -> T2 const*
+  int const *icp = reinterpret_cast<int const*>(ipppc);
+  // Invalid: T1 const* -> T2*
+  (void)reinterpret_cast<int*>(icp); // expected-error {{reinterpret_cast from 'const int *' to 'int *' casts away qualifiers}}
+  // Invalid: T1*** -> T2 const* const**
+  int const *const **icpcpp = reinterpret_cast<int const* const**>(ipppc); // expected-error {{reinterpret_cast from 'int ***' to 'const int *const **' casts away qualifiers}}
+  // Valid: T1* -> T2*
+  int *ip = reinterpret_cast<int*>(icpcpp);
+  // Valid: T* -> T const*
+  (void)reinterpret_cast<int const*>(ip);
+  // Valid: T*** -> T2 const* const* const*
+  (void)reinterpret_cast<int const* const* const*>(ipppc);
+}
+
+void fnptrs()
+{
+  typedef int (*fnptr2)(int);
+  fnptr fp = 0;
+  (void)reinterpret_cast<fnptr2>(fp);
+  void *vp = reinterpret_cast<void*>(fp);
+  (void)reinterpret_cast<fnptr>(vp);
+}
+
+void refs()
+{
+  long l = 0;
+  char &c = reinterpret_cast<char&>(l);
+  // Bad: from rvalue
+  (void)reinterpret_cast<int&>(&c); // expected-error {{reinterpret_cast from rvalue to reference type 'int &'}}
+}
+
+void memptrs()
+{
+  const int structure::*psi = 0;
+  (void)reinterpret_cast<const float structure::*>(psi);
+  (void)reinterpret_cast<int structure::*>(psi); // expected-error {{reinterpret_cast from 'const int structure::*' to 'int structure::*' casts away qualifiers}}
+
+  void (structure::*psf)() = 0;
+  (void)reinterpret_cast<int (structure::*)()>(psf);
+
+  (void)reinterpret_cast<void (structure::*)()>(psi); // expected-error {{reinterpret_cast from 'const int structure::*' to 'void (structure::*)()' is not allowed}}
+  (void)reinterpret_cast<int structure::*>(psf); // expected-error {{reinterpret_cast from 'void (structure::*)()' to 'int structure::*' is not allowed}}
+
+  // Cannot cast from integers to member pointers, not even the null pointer
+  // literal.
+  (void)reinterpret_cast<void (structure::*)()>(0); // expected-error {{reinterpret_cast from 'int' to 'void (structure::*)()' is not allowed}}
+  (void)reinterpret_cast<int structure::*>(0); // expected-error {{reinterpret_cast from 'int' to 'int structure::*' is not allowed}}
+}
+
+namespace PR5545 {
+// PR5545
+class A;
+class B;
+void (A::*a)();
+void (B::*b)() = reinterpret_cast<void (B::*)()>(a);
+}
+
+// <rdar://problem/8018292>
+void const_arrays() {
+  typedef char STRING[10];
+  const STRING *s;
+  const char *c;
+
+  (void)reinterpret_cast<char *>(s); // expected-error {{reinterpret_cast from 'const STRING *' (aka 'char const (*)[10]') to 'char *' casts away qualifiers}}
+  (void)reinterpret_cast<const STRING *>(c);
+}
+
+namespace PR9564 {
+  struct a { int a : 10; }; a x;
+  int *y = &reinterpret_cast<int&>(x.a); // expected-error {{not allowed}}
+
+  __attribute((ext_vector_type(4))) typedef float v4;
+  float& w(v4 &a) { return reinterpret_cast<float&>(a[1]); } // expected-error {{not allowed}}
+}
+
+void dereference_reinterpret_cast() {
+  struct A {};
+  typedef A A2;
+  class B {};
+  typedef B B2;
+  A a;
+  B b;
+  A2 a2;
+  B2 b2;
+  long l;
+  double d;
+  float f;
+  char c;
+  unsigned char uc;
+  void* v_ptr;
+  (void)reinterpret_cast<double&>(l);  // expected-warning {{reinterpret_cast from 'long' to 'double &' has undefined behavior}}
+  (void)*reinterpret_cast<double*>(&l);  // expected-warning {{dereference of type 'double *' that was reinterpret_cast from type 'long *' has undefined behavior}}
+  (void)reinterpret_cast<double&>(f);  // expected-warning {{reinterpret_cast from 'float' to 'double &' has undefined behavior}}
+  (void)*reinterpret_cast<double*>(&f);  // expected-warning {{dereference of type 'double *' that was reinterpret_cast from type 'float *' has undefined behavior}}
+  (void)reinterpret_cast<float&>(l);  // expected-warning {{reinterpret_cast from 'long' to 'float &' has undefined behavior}}
+  (void)*reinterpret_cast<float*>(&l);  // expected-warning {{dereference of type 'float *' that was reinterpret_cast from type 'long *' has undefined behavior}}
+  (void)reinterpret_cast<float&>(d);  // expected-warning {{reinterpret_cast from 'double' to 'float &' has undefined behavior}}
+  (void)*reinterpret_cast<float*>(&d);  // expected-warning {{dereference of type 'float *' that was reinterpret_cast from type 'double *' has undefined behavior}}
+
+  // TODO: add warning for tag types
+  (void)reinterpret_cast<A&>(b);
+  (void)*reinterpret_cast<A*>(&b);
+  (void)reinterpret_cast<B&>(a);
+  (void)*reinterpret_cast<B*>(&a);
+  (void)reinterpret_cast<A2&>(b2);
+  (void)*reinterpret_cast<A2*>(&b2);
+  (void)reinterpret_cast<B2&>(a2);
+  (void)*reinterpret_cast<B2*>(&a2);
+
+  // Casting to itself is allowed
+  (void)reinterpret_cast<A&>(a);
+  (void)*reinterpret_cast<A*>(&a);
+  (void)reinterpret_cast<B&>(b);
+  (void)*reinterpret_cast<B*>(&b);
+  (void)reinterpret_cast<long&>(l);
+  (void)*reinterpret_cast<long*>(&l);
+  (void)reinterpret_cast<double&>(d);
+  (void)*reinterpret_cast<double*>(&d);
+  (void)reinterpret_cast<char&>(c);
+  (void)*reinterpret_cast<char*>(&c);
+
+  // Casting to and from chars are allowable
+  (void)reinterpret_cast<A&>(c);
+  (void)*reinterpret_cast<A*>(&c);
+  (void)reinterpret_cast<B&>(c);
+  (void)*reinterpret_cast<B*>(&c);
+  (void)reinterpret_cast<long&>(c);
+  (void)*reinterpret_cast<long*>(&c);
+  (void)reinterpret_cast<double&>(c);
+  (void)*reinterpret_cast<double*>(&c);
+  (void)reinterpret_cast<char&>(l);
+  (void)*reinterpret_cast<char*>(&l);
+  (void)reinterpret_cast<char&>(d);
+  (void)*reinterpret_cast<char*>(&d);
+  (void)reinterpret_cast<char&>(f);
+  (void)*reinterpret_cast<char*>(&f);
+
+  // Casting from void pointer.
+  (void)*reinterpret_cast<A*>(v_ptr);
+  (void)*reinterpret_cast<B*>(v_ptr);
+  (void)*reinterpret_cast<long*>(v_ptr);
+  (void)*reinterpret_cast<double*>(v_ptr);
+  (void)*reinterpret_cast<float*>(v_ptr);
+
+  // Casting to void pointer
+  (void)*reinterpret_cast<void*>(&a);
+  (void)*reinterpret_cast<void*>(&b);
+  (void)*reinterpret_cast<void*>(&l);
+  (void)*reinterpret_cast<void*>(&d);
+  (void)*reinterpret_cast<void*>(&f);
+}
+
+void reinterpret_cast_whitelist () {
+  // the dynamic type of the object
+  int a;
+  float b;
+  (void)reinterpret_cast<int&>(a);
+  (void)*reinterpret_cast<int*>(&a);
+  (void)reinterpret_cast<float&>(b);
+  (void)*reinterpret_cast<float*>(&b);
+
+  // a cv-qualified version of the dynamic object
+  (void)reinterpret_cast<const int&>(a);
+  (void)*reinterpret_cast<const int*>(&a);
+  (void)reinterpret_cast<volatile int&>(a);
+  (void)*reinterpret_cast<volatile int*>(&a);
+  (void)reinterpret_cast<const volatile int&>(a);
+  (void)*reinterpret_cast<const volatile int*>(&a);
+  (void)reinterpret_cast<const float&>(b);
+  (void)*reinterpret_cast<const float*>(&b);
+  (void)reinterpret_cast<volatile float&>(b);
+  (void)*reinterpret_cast<volatile float*>(&b);
+  (void)reinterpret_cast<const volatile float&>(b);
+  (void)*reinterpret_cast<const volatile float*>(&b);
+
+  // a type that is the signed or unsigned type corresponding to the dynamic
+  // type of the object
+  signed d;
+  unsigned e;
+  (void)reinterpret_cast<signed&>(d);
+  (void)*reinterpret_cast<signed*>(&d);
+  (void)reinterpret_cast<signed&>(e);
+  (void)*reinterpret_cast<signed*>(&e);
+  (void)reinterpret_cast<unsigned&>(d);
+  (void)*reinterpret_cast<unsigned*>(&d);
+  (void)reinterpret_cast<unsigned&>(e);
+  (void)*reinterpret_cast<unsigned*>(&e);
+
+  // a type that is the signed or unsigned type corresponding a cv-qualified
+  // version of the dynamic type the object
+  (void)reinterpret_cast<const signed&>(d);
+  (void)*reinterpret_cast<const signed*>(&d);
+  (void)reinterpret_cast<const signed&>(e);
+  (void)*reinterpret_cast<const signed*>(&e);
+  (void)reinterpret_cast<const unsigned&>(d);
+  (void)*reinterpret_cast<const unsigned*>(&d);
+  (void)reinterpret_cast<const unsigned&>(e);
+  (void)*reinterpret_cast<const unsigned*>(&e);
+  (void)reinterpret_cast<volatile signed&>(d);
+  (void)*reinterpret_cast<volatile signed*>(&d);
+  (void)reinterpret_cast<volatile signed&>(e);
+  (void)*reinterpret_cast<volatile signed*>(&e);
+  (void)reinterpret_cast<volatile unsigned&>(d);
+  (void)*reinterpret_cast<volatile unsigned*>(&d);
+  (void)reinterpret_cast<volatile unsigned&>(e);
+  (void)*reinterpret_cast<volatile unsigned*>(&e);
+  (void)reinterpret_cast<const volatile signed&>(d);
+  (void)*reinterpret_cast<const volatile signed*>(&d);
+  (void)reinterpret_cast<const volatile signed&>(e);
+  (void)*reinterpret_cast<const volatile signed*>(&e);
+  (void)reinterpret_cast<const volatile unsigned&>(d);
+  (void)*reinterpret_cast<const volatile unsigned*>(&d);
+  (void)reinterpret_cast<const volatile unsigned&>(e);
+  (void)*reinterpret_cast<const volatile unsigned*>(&e);
+
+  // an aggregate or union type that includes one of the aforementioned types
+  // among its members (including, recursively, a member of a subaggregate or
+  // contained union)
+  // TODO: checking is not implemented for tag types
+
+  // a type that is a (possible cv-qualified) base class type of the dynamic
+  // type of the object
+  // TODO: checking is not implemented for tag types
+
+  // a char or unsigned char type
+  (void)reinterpret_cast<char&>(a);
+  (void)*reinterpret_cast<char*>(&a);
+  (void)reinterpret_cast<unsigned char&>(a);
+  (void)*reinterpret_cast<unsigned char*>(&a);
+  (void)reinterpret_cast<char&>(b);
+  (void)*reinterpret_cast<char*>(&b);
+  (void)reinterpret_cast<unsigned char&>(b);
+  (void)*reinterpret_cast<unsigned char*>(&b);
+}