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// RUN: %check_clang_tidy %s llvm-prefer-isa-or-dyn-cast-in-conditionals %t
struct X;
struct Y;
struct Z {
int foo();
X *bar();
X *cast(Y*);
bool baz(Y*);
};
template <class X, class Y>
bool isa(Y *);
template <class X, class Y>
X *cast(Y *);
template <class X, class Y>
X *dyn_cast(Y *);
template <class X, class Y>
X *dyn_cast_or_null(Y *);
bool foo(Y *y, Z *z) {
if (auto x = cast<X>(y))
return true;
// CHECK-MESSAGES: :[[@LINE-2]]:16: warning: cast<> in conditional will assert rather than return a null pointer [llvm-prefer-isa-or-dyn-cast-in-conditionals]
// CHECK-FIXES: if (auto x = dyn_cast<X>(y))
while (auto x = cast<X>(y))
break;
// CHECK-MESSAGES: :[[@LINE-2]]:19: warning: cast<> in conditional
// CHECK-FIXES: while (auto x = dyn_cast<X>(y))
if (cast<X>(y))
return true;
// CHECK-MESSAGES: :[[@LINE-2]]:7: warning: cast<> in conditional
// CHECK-FIXES: if (isa<X>(y))
while (cast<X>(y))
break;
// CHECK-MESSAGES: :[[@LINE-2]]:10: warning: cast<> in conditional
// CHECK-FIXES: while (isa<X>(y))
do {
break;
} while (cast<X>(y));
// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: cast<> in conditional
// CHECK-FIXES: while (isa<X>(y));
if (dyn_cast<X>(y))
return true;
// CHECK-MESSAGES: :[[@LINE-2]]:7: warning: return value from dyn_cast<> not used [llvm-prefer-isa-or-dyn-cast-in-conditionals]
// CHECK-FIXES: if (isa<X>(y))
while (dyn_cast<X>(y))
break;
// CHECK-MESSAGES: :[[@LINE-2]]:10: warning: return value from dyn_cast<> not used
// CHECK-FIXES: while (isa<X>(y))
do {
break;
} while (dyn_cast<X>(y));
// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: return value from dyn_cast<> not used
// CHECK-FIXES: while (isa<X>(y));
if (y && isa<X>(y))
return true;
// CHECK-MESSAGES: :[[@LINE-2]]:7: warning: isa_and_nonnull<> is preferred over an explicit test for null followed by calling isa<> [llvm-prefer-isa-or-dyn-cast-in-conditionals]
// CHECK-FIXES: if (isa_and_nonnull<X>(y))
if (z->bar() && isa<Y>(z->bar()))
return true;
// CHECK-MESSAGES: :[[@LINE-2]]:7: warning: isa_and_nonnull<> is preferred
// CHECK-FIXES: if (isa_and_nonnull<Y>(z->bar()))
if (z->bar() && cast<Y>(z->bar()))
return true;
// CHECK-MESSAGES: :[[@LINE-2]]:7: warning: isa_and_nonnull<> is preferred
// CHECK-FIXES: if (isa_and_nonnull<Y>(z->bar()))
if (z->bar() && dyn_cast<Y>(z->bar()))
return true;
// CHECK-MESSAGES: :[[@LINE-2]]:7: warning: isa_and_nonnull<> is preferred
// CHECK-FIXES: if (isa_and_nonnull<Y>(z->bar()))
if (z->bar() && dyn_cast_or_null<Y>(z->bar()))
return true;
// CHECK-MESSAGES: :[[@LINE-2]]:7: warning: isa_and_nonnull<> is preferred
// CHECK-FIXES: if (isa_and_nonnull<Y>(z->bar()))
bool b = z->bar() && cast<Y>(z->bar());
// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: isa_and_nonnull<> is preferred
// CHECK-FIXES: bool b = isa_and_nonnull<Y>(z->bar());
// These don't trigger a warning.
if (auto x = cast<Z>(y)->foo())
return true;
if (auto x = z->cast(y))
return true;
while (auto x = cast<Z>(y)->foo())
break;
if (cast<Z>(y)->foo())
return true;
if (z->cast(y))
return true;
while (cast<Z>(y)->foo())
break;
if (y && cast<X>(z->bar()))
return true;
if (z && cast<Z>(y)->foo())
return true;
bool b2 = y && cast<X>(z);
if(z->cast(y))
return true;
if (z->baz(cast<Y>(z)))
return true;
#define CAST(T, Obj) cast<T>(Obj)
#define AUTO_VAR_CAST(X, Y, Z) auto X = cast<Y>(Z)
#define ISA(T, Obj) isa<T>(Obj)
#define ISA_OR_NULL(T, Obj) Obj &&isa<T>(Obj)
// Macros don't trigger warning.
if (auto x = CAST(X, y))
return true;
if (AUTO_VAR_CAST(x, X, z))
return true;
if (z->bar() && ISA(Y, z->bar()))
return true;
if (ISA_OR_NULL(Y, z->bar()))
return true;
return false;
}
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