bpf_dsl: fix argument-dependent lookup of BoolExpr operators

sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <fcntl.h>
 #include <linux/futex.h>
@@ skipping 70 matching lines @@
 
 #define CASES SANDBOX_BPF_DSL_CASES
 
 using sandbox::bpf_dsl::Allow;
 using sandbox::bpf_dsl::Arg;
 using sandbox::bpf_dsl::BoolExpr;
 using sandbox::bpf_dsl::Error;
 using sandbox::bpf_dsl::If;
 using sandbox::bpf_dsl::ResultExpr;
 
-// TODO(mdempsky): Make BoolExpr a standalone class so these operators can
-// be resolved via argument-dependent lookup.
-using sandbox::bpf_dsl::operator||;
-using sandbox::bpf_dsl::operator&&;
-
 namespace sandbox {
 
 // Allow Glibc's and Android pthread creation flags, crash on any other
 // thread creation attempts and EPERM attempts to use neither
 // CLONE_VM, nor CLONE_THREAD, which includes all fork() implementations.
 ResultExpr RestrictCloneToThreadsAndEPERMFork() {
   const Arg<unsigned long> flags(0);
 
   // TODO(mdempsky): Extend DSL to support (flags & ~mask1) == mask2.
   const uint64_t kAndroidCloneMask = CLONE_VM | CLONE_FS | CLONE_FILES |
@@ skipping 132 matching lines @@
               FUTEX_REQUEUE,
               FUTEX_CMP_REQUEUE,
               FUTEX_WAKE_OP,
               FUTEX_WAIT_BITSET,
               FUTEX_WAKE_BITSET),
              Allow())
       .Default(CrashSIGSYSFutex());
 }
 
 }  // namespace sandbox.