First stab at try-catch and try-finally in TurboFan.

src/compiler/control-builders.h

 // Copyright 2013 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_COMPILER_CONTROL_BUILDERS_H_
 #define V8_COMPILER_CONTROL_BUILDERS_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/ast-graph-builder.h"
 #include "src/compiler/node.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Base class for all control builders. Also provides a common interface for
-// control builders to handle 'break' and 'continue' statements when they are
-// used to model breakable statements.
+// control builders to handle 'break' statements when they are used to model
+// breakable statements.
 class ControlBuilder {
  public:
   explicit ControlBuilder(AstGraphBuilder* builder) : builder_(builder) {}
   virtual ~ControlBuilder() {}
 
-  // Interface for break and continue.
+  // Interface for break.
   virtual void Break() { UNREACHABLE(); }
-  virtual void Continue() { UNREACHABLE(); }
 
  protected:
   typedef AstGraphBuilder Builder;
   typedef AstGraphBuilder::Environment Environment;
 
   Zone* zone() const { return builder_->local_zone(); }
   Environment* environment() { return builder_->environment(); }
   void set_environment(Environment* env) { builder_->set_environment(env); }
 
   Builder* builder_;
@@ skipping 24 matching lines @@
 class LoopBuilder FINAL : public ControlBuilder {
  public:
   explicit LoopBuilder(AstGraphBuilder* builder)
       : ControlBuilder(builder),
         loop_environment_(NULL),
         continue_environment_(NULL),
         break_environment_(NULL) {}
 
   // Primitive control commands.
   void BeginLoop(BitVector* assigned, bool is_osr = false);
+  void Continue();
   void EndBody();
   void EndLoop();
 
-  // Primitive support for break and continue.
-  void Continue() FINAL;
+  // Primitive support for break.
   void Break() FINAL;
 
   // Compound control commands for conditional break.
   void BreakUnless(Node* condition);
   void BreakWhen(Node* condition);
 
  private:
   Environment* loop_environment_;      // Environment of the loop header.
   Environment* continue_environment_;  // Environment after the loop body.
   Environment* break_environment_;     // Environment after the loop exits.
@@ skipping 43 matching lines @@
   void BeginBlock();
   void EndBlock();
 
   // Primitive support for break.
   void Break() FINAL;
 
  private:
   Environment* break_environment_;  // Environment after the block exits.
 };
 
+
+// Tracks control flow for a try-catch statement.
+class TryCatchBuilder FINAL : public ControlBuilder {
+ public:
+  explicit TryCatchBuilder(AstGraphBuilder* builder)
+      : ControlBuilder(builder),
+        catch_environment_(NULL),
+        exit_environment_(NULL),
+        exception_node_(NULL) {}
+
+  // Primitive control commands.
+  void BeginTry();
+  void Throw(Node* exception);
+  void EndTry();
+  void EndCatch();
+
+  // Returns the exception value inside the 'catch' body.
+  Node* GetExceptionNode() const { return exception_node_; }
+
+ private:
+  Environment* catch_environment_;  // Environment for the 'catch' body.
+  Environment* exit_environment_;   // Environment after the statement.
+  Node* exception_node_;            // Node for exception in 'catch' body.
+};
+
+
+// Tracks control flow for a try-finally statement.
+class TryFinallyBuilder FINAL : public ControlBuilder {
+ public:
+  explicit TryFinallyBuilder(AstGraphBuilder* builder)
+      : ControlBuilder(builder),
+        finally_environment_(NULL),
+        token_node_(NULL) {}
+
+  // Primitive control commands.
+  void BeginTry();
+  void LeaveTry(Node* token);
+  void EndTry(Node* token);
+  void EndFinally();
+
+  // Returns the dispatch token value inside the 'finally' body.
+  Node* GetDispatchTokenNode() const { return token_node_; }
+
+ private:
+  Environment* finally_environment_;  // Environment for the 'finally' body.
+  Node* token_node_;                  // Node for token in 'finally' body.
+};
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CONTROL_BUILDERS_H_