324 lines
14 KiB
C++
324 lines
14 KiB
C++
// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify -Wreinterpret-base-class -Wno-unused-volatile-lvalue %s
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// RUN: %clang_cc1 -std=c++11 -fsyntax-only -fdiagnostics-parseable-fixits -Wreinterpret-base-class -Wno-unused-volatile-lvalue %s 2>&1 | FileCheck %s
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// PR 13824
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class A {
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};
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class DA : public A {
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};
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class DDA : public DA {
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};
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class DAo : protected A {
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};
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class DAi : private A {
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};
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class DVA : public virtual A {
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};
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class DDVA : public virtual DA {
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};
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class DMA : public virtual A, public virtual DA {
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};
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class B;
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struct C {
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// Do not fail on incompletely-defined classes.
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decltype(reinterpret_cast<C *>(0)) foo;
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decltype(reinterpret_cast<A *>((C *) 0)) bar;
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decltype(reinterpret_cast<C *>((A *) 0)) baz;
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};
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void reinterpret_not_defined_class(B *b, C *c) {
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// Should not fail if class has no definition.
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(void)*reinterpret_cast<C *>(b);
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(void)*reinterpret_cast<B *>(c);
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(void)reinterpret_cast<C &>(*b);
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(void)reinterpret_cast<B &>(*c);
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}
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// Do not fail on erroneous classes with fields of incompletely-defined types.
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// Base class is malformed.
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namespace BaseMalformed {
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struct A; // expected-note {{forward declaration of 'BaseMalformed::A'}}
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struct B {
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A a; // expected-error {{field has incomplete type 'BaseMalformed::A'}}
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};
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struct C : public B {} c;
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B *b = reinterpret_cast<B *>(&c);
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} // end anonymous namespace
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// Child class is malformed.
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namespace ChildMalformed {
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struct A; // expected-note {{forward declaration of 'ChildMalformed::A'}}
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struct B {};
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struct C : public B {
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A a; // expected-error {{field has incomplete type 'ChildMalformed::A'}}
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} c;
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B *b = reinterpret_cast<B *>(&c);
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} // end anonymous namespace
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// Base class outside upcast base-chain is malformed.
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namespace BaseBaseMalformed {
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struct A; // expected-note {{forward declaration of 'BaseBaseMalformed::A'}}
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struct Y {};
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struct X { A a; }; // expected-error {{field has incomplete type 'BaseBaseMalformed::A'}}
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struct B : Y, X {};
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struct C : B {} c;
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B *p = reinterpret_cast<B*>(&c);
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}
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namespace InheritanceMalformed {
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struct A; // expected-note {{forward declaration of 'InheritanceMalformed::A'}}
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struct B : A {}; // expected-error {{base class has incomplete type}}
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struct C : B {} c;
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B *p = reinterpret_cast<B*>(&c);
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}
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// Virtual base class outside upcast base-chain is malformed.
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namespace VBaseMalformed{
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struct A; // expected-note {{forward declaration of 'VBaseMalformed::A'}}
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struct X { A a; }; // expected-error {{field has incomplete type 'VBaseMalformed::A'}}
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struct B : public virtual X {};
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struct C : B {} c;
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B *p = reinterpret_cast<B*>(&c);
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}
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void reinterpret_not_updowncast(A *pa, const A *pca, A &a, const A &ca) {
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(void)*reinterpret_cast<C *>(pa);
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(void)*reinterpret_cast<const C *>(pa);
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(void)*reinterpret_cast<volatile C *>(pa);
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(void)*reinterpret_cast<const volatile C *>(pa);
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(void)*reinterpret_cast<const C *>(pca);
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(void)*reinterpret_cast<const volatile C *>(pca);
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(void)reinterpret_cast<C &>(a);
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(void)reinterpret_cast<const C &>(a);
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(void)reinterpret_cast<volatile C &>(a);
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(void)reinterpret_cast<const volatile C &>(a);
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(void)reinterpret_cast<const C &>(ca);
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(void)reinterpret_cast<const volatile C &>(ca);
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}
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void reinterpret_pointer_downcast(A *a, const A *ca) {
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(void)*reinterpret_cast<DA *>(a);
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(void)*reinterpret_cast<const DA *>(a);
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(void)*reinterpret_cast<volatile DA *>(a);
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(void)*reinterpret_cast<const volatile DA *>(a);
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(void)*reinterpret_cast<const DA *>(ca);
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(void)*reinterpret_cast<const volatile DA *>(ca);
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(void)*reinterpret_cast<DDA *>(a);
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(void)*reinterpret_cast<DAo *>(a);
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(void)*reinterpret_cast<DAi *>(a);
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// expected-warning@+2 {{'reinterpret_cast' to class 'DVA *' from its virtual base 'A *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)*reinterpret_cast<DVA *>(a);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:10-[[@LINE-1]]:26}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' to class 'DDVA *' from its virtual base 'A *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)*reinterpret_cast<DDVA *>(a);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:10-[[@LINE-1]]:26}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' to class 'DMA *' from its virtual base 'A *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)*reinterpret_cast<DMA *>(a);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:10-[[@LINE-1]]:26}:"static_cast"
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}
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void reinterpret_reference_downcast(A a, A &ra, const A &cra) {
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(void)reinterpret_cast<DA &>(a);
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(void)reinterpret_cast<const DA &>(a);
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(void)reinterpret_cast<volatile DA &>(a);
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(void)reinterpret_cast<const volatile DA &>(a);
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(void)reinterpret_cast<DA &>(ra);
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(void)reinterpret_cast<const DA &>(ra);
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(void)reinterpret_cast<volatile DA &>(ra);
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(void)reinterpret_cast<const volatile DA &>(ra);
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(void)reinterpret_cast<const DA &>(cra);
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(void)reinterpret_cast<const volatile DA &>(cra);
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(void)reinterpret_cast<DDA &>(a);
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(void)reinterpret_cast<DAo &>(a);
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(void)reinterpret_cast<DAi &>(a);
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// expected-warning@+2 {{'reinterpret_cast' to class 'DVA &' from its virtual base 'A' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)reinterpret_cast<DVA &>(a);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' to class 'DDVA &' from its virtual base 'A' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)reinterpret_cast<DDVA &>(a);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' to class 'DMA &' from its virtual base 'A' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)reinterpret_cast<DMA &>(a);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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}
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void reinterpret_pointer_upcast(DA *da, const DA *cda, DDA *dda, DAo *dao,
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DAi *dai, DVA *dva, DDVA *ddva, DMA *dma) {
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(void)*reinterpret_cast<A *>(da);
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(void)*reinterpret_cast<const A *>(da);
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(void)*reinterpret_cast<volatile A *>(da);
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(void)*reinterpret_cast<const volatile A *>(da);
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(void)*reinterpret_cast<const A *>(cda);
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(void)*reinterpret_cast<const volatile A *>(cda);
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(void)*reinterpret_cast<A *>(dda);
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(void)*reinterpret_cast<DA *>(dda);
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(void)*reinterpret_cast<A *>(dao);
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(void)*reinterpret_cast<A *>(dai);
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// expected-warning@+2 {{'reinterpret_cast' from class 'DVA *' to its virtual base 'A *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)*reinterpret_cast<A *>(dva);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:10-[[@LINE-1]]:26}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' from class 'DDVA *' to its virtual base 'A *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)*reinterpret_cast<A *>(ddva);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:10-[[@LINE-1]]:26}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' from class 'DDVA *' to its virtual base 'DA *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)*reinterpret_cast<DA *>(ddva);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:10-[[@LINE-1]]:26}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' from class 'DMA *' to its virtual base 'A *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)*reinterpret_cast<A *>(dma);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:10-[[@LINE-1]]:26}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' from class 'DMA *' to its virtual base 'DA *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)*reinterpret_cast<DA *>(dma);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:10-[[@LINE-1]]:26}:"static_cast"
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}
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void reinterpret_reference_upcast(DA &da, const DA &cda, DDA &dda, DAo &dao,
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DAi &dai, DVA &dva, DDVA &ddva, DMA &dma) {
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(void)reinterpret_cast<A &>(da);
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(void)reinterpret_cast<const A &>(da);
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(void)reinterpret_cast<volatile A &>(da);
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(void)reinterpret_cast<const volatile A &>(da);
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(void)reinterpret_cast<const A &>(cda);
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(void)reinterpret_cast<const volatile A &>(cda);
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(void)reinterpret_cast<A &>(dda);
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(void)reinterpret_cast<DA &>(dda);
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(void)reinterpret_cast<A &>(dao);
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(void)reinterpret_cast<A &>(dai);
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// expected-warning@+2 {{'reinterpret_cast' from class 'DVA' to its virtual base 'A &' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)reinterpret_cast<A &>(dva);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' from class 'DDVA' to its virtual base 'A &' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)reinterpret_cast<A &>(ddva);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' from class 'DDVA' to its virtual base 'DA &' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)reinterpret_cast<DA &>(ddva);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' from class 'DMA' to its virtual base 'A &' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)reinterpret_cast<A &>(dma);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' from class 'DMA' to its virtual base 'DA &' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)reinterpret_cast<DA &>(dma);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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}
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struct E {
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int x;
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};
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class F : public E {
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virtual int foo() { return x; }
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};
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class G : public F {
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};
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class H : public E, public A {
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};
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class I : virtual public F {
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};
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typedef const F * K;
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typedef volatile K L;
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void different_subobject_downcast(E *e, F *f, A *a) {
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// expected-warning@+2 {{'reinterpret_cast' to class 'F *' from its base at non-zero offset 'E *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)reinterpret_cast<F *>(e);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' to class 'G *' from its base at non-zero offset 'E *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)reinterpret_cast<G *>(e);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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(void)reinterpret_cast<H *>(e);
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// expected-warning@+2 {{'reinterpret_cast' to class 'I *' from its virtual base 'E *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)reinterpret_cast<I *>(e);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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(void)reinterpret_cast<G *>(f);
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// expected-warning@+2 {{'reinterpret_cast' to class 'I *' from its virtual base 'F *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)reinterpret_cast<I *>(f);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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(void)reinterpret_cast<H *>(a);
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// expected-warning@+2 {{'reinterpret_cast' to class 'L' (aka 'const F *volatile') from its base at non-zero offset 'E *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while downcasting}}
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(void)reinterpret_cast<L>(e);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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}
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void different_subobject_upcast(F *f, G *g, H *h, I *i) {
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// expected-warning@+2 {{'reinterpret_cast' from class 'F *' to its base at non-zero offset 'E *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)reinterpret_cast<E *>(f);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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(void)reinterpret_cast<F *>(g);
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// expected-warning@+2 {{'reinterpret_cast' from class 'G *' to its base at non-zero offset 'E *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)reinterpret_cast<E *>(g);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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(void)reinterpret_cast<E *>(h);
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(void)reinterpret_cast<A *>(h);
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// expected-warning@+2 {{'reinterpret_cast' from class 'I *' to its virtual base 'F *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)reinterpret_cast<F *>(i);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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// expected-warning@+2 {{'reinterpret_cast' from class 'I *' to its virtual base 'E *' behaves differently from 'static_cast'}}
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// expected-note@+1 {{use 'static_cast' to adjust the pointer correctly while upcasting}}
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(void)reinterpret_cast<E *>(i);
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// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:9-[[@LINE-1]]:25}:"static_cast"
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}
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