bpf_dsl: move Verifier into PolicyCompiler

sandbox/linux/seccomp-bpf/verifier.h

-// Copyright (c) 2012 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.
-
-#ifndef SANDBOX_LINUX_SECCOMP_BPF_VERIFIER_H__
-#define SANDBOX_LINUX_SECCOMP_BPF_VERIFIER_H__
-
-#include <stdint.h>
-
-#include <vector>
-
-#include "base/macros.h"
-#include "sandbox/sandbox_export.h"
-
-struct sock_filter;
-
-namespace sandbox {
-struct arch_seccomp_data;
-namespace bpf_dsl {
-class Policy;
-class PolicyCompiler;
-}
-
-class SANDBOX_EXPORT Verifier {
- public:
-  // Evaluate the BPF program for all possible inputs and verify that it
-  // computes the correct result. We use the "evaluators" to determine
-  // the full set of possible inputs that we have to iterate over.
-  // Returns success, if the BPF filter accurately reflects the rules
-  // set by the "evaluators".
-  // Upon success, "err" is set to NULL. Upon failure, it contains a static
-  // error message that does not need to be free()'d.
-  static bool VerifyBPF(bpf_dsl::PolicyCompiler* compiler,
-                        const std::vector<struct sock_filter>& program,
-                        const bpf_dsl::Policy& policy,
-                        const char** err);
-
-  // Evaluate a given BPF program for a particular set of system call
-  // parameters. If evaluation failed for any reason, "err" will be set to
-  // a non-NULL error string. Otherwise, the BPF program's result will be
-  // returned by the function and "err" is NULL.
-  // We do not actually implement the full BPF state machine, but only the
-  // parts that can actually be generated by our BPF compiler. If this code
-  // is used for purposes other than verifying the output of the sandbox's
-  // BPF compiler, we might have to extend this BPF interpreter.
-  static uint32_t EvaluateBPF(const std::vector<struct sock_filter>& program,
-                              const struct arch_seccomp_data& data,
-                              const char** err);
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(Verifier);
-};
-
-}  // namespace sandbox
-
-#endif  // SANDBOX_LINUX_SECCOMP_BPF_VERIFIER_H__