[interpreter] Implement exception handler table building.

src/interpreter/control-flow-builders.h

 // Copyright 2015 the V8 project 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 V8_INTERPRETER_CONTROL_FLOW_BUILDERS_H_
 #define V8_INTERPRETER_CONTROL_FLOW_BUILDERS_H_
 
 #include "src/interpreter/bytecode-array-builder.h"
 
 #include "src/zone-containers.h"
@@ skipping 126 matching lines @@
   // This method is called when all cases comparisons have been emitted if there
   // is a default case statement. Inserts a Jump to a unbound label that is
   // patched when the corresponding SetCaseTarget is called.
   void DefaultAt(int index) { EmitJump(&case_sites_, index); }
 
  private:
   // Unbound labels that identify jumps for case statements in the code.
   ZoneVector<BytecodeLabel> case_sites_;
 };
 
+
+// A class to help with co-ordinating control flow in try-catch statements.
+class TryCatchBuilder final : public ControlFlowBuilder {
+ public:
+  explicit TryCatchBuilder(BytecodeArrayBuilder* builder)
+      : ControlFlowBuilder(builder), handler_id_(builder->NewHandlerEntry()) {}
+
+  void BeginTry(Register context);
+  void EndTry();
+  void EndCatch();
+
+ private:
+  int handler_id_;
+  BytecodeLabel handler_;
+  BytecodeLabel exit_;
+};
+
+
+// A class to help with co-ordinating control flow in try-finally statements.
+class TryFinallyBuilder final : public ControlFlowBuilder {
+ public:
+  explicit TryFinallyBuilder(BytecodeArrayBuilder* builder)
+      : ControlFlowBuilder(builder), handler_id_(builder->NewHandlerEntry()) {}
+
+  void BeginTry(Register context);
+  void EndTry();
+  void EndFinally();
+
+ private:
+  int handler_id_;
+  BytecodeLabel handler_;
+};
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_CONTROL_FLOW_BUILDERS_H_