llvm/test/TableGen/self-reference.td

// RUN: llvm-tblgen %s | FileCheck %s
// XFAIL: vg_leak

// CHECK: --- Defs ---

// CHECK: def A0 {
// CHECK:   dag a = (ops A0);
// CHECK: }

// CHECK: def B0 {
// CHECK:   dag a = (ops);
// CHECK:   A b = B0;
// CHECK: }

// CHECK: def C0 {
// CHECK:   dag q = (ops C0);
// CHECK: }

def ops;

class A<dag d> {
  dag a = d;
}

// This type of self-reference is used in various places defining register
// classes.
def A0 : A<(ops A0)>;

class B<string self> {
  A b = !cast<A>(self);
}

// A stronger form of this type of self-reference is used at least in the
// SystemZ backend to define a record which is a ComplexPattern and an Operand
// at the same time.
def B0 : A<(ops)>, B<"B0">;

// Casting C0 to C by name here is tricky, because it happens while (or rather:
// before) adding C as a superclass. However, SystemZ uses this pattern.
class C<string self> {
  dag q = (ops !cast<C>(self));
}

def C0 : C<"C0">;