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+/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+
+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 TENSORFLOW_COMPILER_AOT_COMPILE_H_
+#define TENSORFLOW_COMPILER_AOT_COMPILE_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "tensorflow/compiler/aot/flags.h"
+#include "tensorflow/compiler/aot/tfcompile.pb.h"
+#include "tensorflow/compiler/xla/service/compiler.h"
+#include "tensorflow/compiler/xla/service/cpu/cpu_compiler.h"
+#include "tensorflow/compiler/xla/xla_data.pb.h"
+#include "tensorflow/core/framework/function.h"
+#include "tensorflow/core/framework/graph.pb.h"
+#include "tensorflow/core/graph/graph.h"
+
+namespace tensorflow {
+namespace tfcompile {
+
+// Constants for op types and attribute names.
+extern const char* const kArgOp;
+extern const char* const kRetvalOp;
+extern const char* const kFeedIdAttr;
+extern const char* const kFetchIdAttr;
+extern const char* const kShapeAttr;
+extern const char* const kDebugNameAttr;
+
+// InitGraph creates a graph based on the graph_def, that may then be compiled
+// by CompileGraph.
+//
+// The graph is rewritten with _Arg and _Retval nodes, representing the inputs
+// and outputs of the function that will be compiled.  Each feed id causes a new
+// _Arg node to be created, where we first collect all existing edges pointing
+// from the named node's output index, and then rewrite them to point from that
+// _Arg node instead.  Each fetch id causes a new _Retval node to be created,
+// with a new edge pointing from the named node's output index to that _Retval
+// node.  All _Retval nodes also point to a special CompileExpressions node,
+// used internally to finish the compilation.
+//
+// The rewritten graph is then pruned to only contain the portion necessary to
+// compute the outputs.  If dump_graphs is true, graph rewrites will be dumped
+// for debugging.
+Status InitGraph(const GraphDef& graph_def, const Config& config,
+                 const MainFlags& flags, const FunctionLibraryDefinition* flib,
+                 std::unique_ptr<Graph>* graph);
+
+// CompileResult describes the output of CompileGraph, where the object file
+// data and meta-information is available in aot.
+struct CompileResult {
+  // Contains object file and meta-info.
+  std::unique_ptr<xla::cpu::CpuAotCompilationResult> aot;
+  xla::ProgramShape program_shape;  // Static shape of args and results.
+  bool has_context_arg = false;     // Is last arg XlaLocalRuntimeContext?
+  string entry_point;               // Name of generated function.
+  int pointer_size = 0;             // Size of a pointer in bytes.
+};
+
+// CompileGraph compiles the graph into an object file containing a function
+// that performs the graph operations.
+//
+// The graph must have _Arg and _Retval nodes representing the function inputs
+// and outputs.  Every _Arg node must have a shape attribute (key=kShapeAttr,
+// value=TensorShape) representing the static shape of that input, and every
+// _Retval node must point to a CompileExpressions node.
+//
+// Typically InitGraph is called to perform this initialization, followed by
+// full specification of the shape attributes.
+//
+// The XLA compilation options are specified in the flags.
+Status CompileGraph(std::unique_ptr<Graph> graph, const MainFlags& flags,
+                    const FunctionLibraryDefinition* flib,
+                    CompileResult* result);
+
+}  // namespace tfcompile
+}  // namespace tensorflow
+
+#endif  // TENSORFLOW_COMPILER_AOT_COMPILE_H_