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diff --git a/src/trace_processor/ftrace_descriptors.h b/src/trace_processor/ftrace_descriptors.h
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+++ b/src/trace_processor/ftrace_descriptors.h
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+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SRC_TRACE_PROCESSOR_FTRACE_DESCRIPTORS_H_
+#define SRC_TRACE_PROCESSOR_FTRACE_DESCRIPTORS_H_
+
+#include <array>
+#include "perfetto/protozero/proto_utils.h"
+
+namespace perfetto {
+namespace trace_processor {
+
+using protozero::proto_utils::ProtoSchemaType;
+
+// We assume that no ftrace event (e.g. SchedSwitchFtraceEvent) has a proto
+// field which id is >= this.
+static constexpr size_t kMaxFtraceEventFields = 32;
+
+// This file is the header for the generated descriptors for all ftrace event
+// protos. These descriptors can be used to parse ftrace event protos without
+// needing individual parsing logic for every event. (In proto_trace_parser.cc)
+// By generating these descriptors we avoid having to build the full proto
+// library. These structs deliberately don't have a ctor (nor are initialized)
+// because they are used to define linker-initialized dicts in the .cc file.
+struct FieldDescriptor {
+  const char* name;
+  ProtoSchemaType type;
+};
+
+struct MessageDescriptor {
+  const char* name;
+  size_t max_field_id;
+  FieldDescriptor fields[kMaxFtraceEventFields];
+};
+
+MessageDescriptor* GetMessageDescriptorForId(size_t id);
+size_t GetDescriptorsSize();
+
+}  // namespace trace_processor
+}  // namespace perfetto
+#endif  // SRC_TRACE_PROCESSOR_FTRACE_DESCRIPTORS_H_