public override void CGenStmt(Env env, CGenState state) {
ExprType ret_type = env.GetCurrentFunction().ret_t;
Int32 stack_size = state.StackSize;
// Evaluate the value.
expr.CGenValue(env, state);
// If the function returns a struct, copy it to the address given by 8(%ebp).
if (expr.type is TStructOrUnion) {
state.MOVL(Reg.EAX, Reg.ESI);
state.MOVL(2 * ExprType.SIZEOF_POINTER, Reg.EBP, Reg.EDI);
state.MOVL(expr.type.SizeOf, Reg.ECX);
state.CGenMemCpy();
state.MOVL(2 * ExprType.SIZEOF_POINTER, Reg.EBP, Reg.EAX);
}
// Restore stack size.
state.CGenForceStackSizeTo(stack_size);
// Jump to end of the function.
state.JMP(state.ReturnLabel);
}