[interpreter] Deprecate notion of an unreachable environment.

src/compiler/bytecode-graph-builder.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_COMPILER_BYTECODE_GRAPH_BUILDER_H_
 #define V8_COMPILER_BYTECODE_GRAPH_BUILDER_H_
 
 #include "src/compiler.h"
 #include "src/compiler/bytecode-branch-analysis.h"
 #include "src/compiler/js-graph.h"
@@ skipping 89 matching lines @@
   // Helpers for merging control, effect or value dependencies.
   Node* MergeControl(Node* control, Node* other);
   Node* MergeEffect(Node* effect, Node* other_effect, Node* control);
   Node* MergeValue(Node* value, Node* other_value, Node* control);
 
   // The main node creation chokepoint. Adds context, frame state, effect,
   // and control dependencies depending on the operator.
   Node* MakeNode(const Operator* op, int value_input_count, Node** value_inputs,
                  bool incomplete);
 
-  // Helper to indicate a node exits the function body.
-  void UpdateControlDependencyToLeaveFunction(Node* exit);
-
   Node** EnsureInputBufferSize(int size);
 
   Node* ProcessCallArguments(const Operator* call_op, Node* callee,
                              interpreter::Register receiver, size_t arity);
   Node* ProcessCallNewArguments(const Operator* call_new_op,
                                 interpreter::Register callee,
                                 interpreter::Register first_arg, size_t arity);
   Node* ProcessCallRuntimeArguments(const Operator* call_runtime_op,
                                     interpreter::Register first_arg,
                                     size_t arity);
 
   void BuildCreateLiteral(const Operator* op);
   void BuildCreateRegExpLiteral();
   void BuildCreateArrayLiteral();
   void BuildCreateObjectLiteral();
   void BuildCreateArguments(CreateArgumentsParameters::Type type);
   void BuildLoadGlobal(TypeofMode typeof_mode);
   void BuildStoreGlobal();
   void BuildNamedLoad();
   void BuildKeyedLoad();
   void BuildNamedStore();
   void BuildKeyedStore();
   void BuildLdaLookupSlot(TypeofMode typeof_mode);
   void BuildStaLookupSlot(LanguageMode language_mode);
   void BuildCall();
   void BuildCallJSRuntime();
   void BuildCallRuntime();
   void BuildCallRuntimeForPair();
   void BuildCallConstruct();
+  void BuildThrowOp(const Operator* op);
   void BuildBinaryOp(const Operator* op);
   void BuildCompareOp(const Operator* op);
   void BuildDelete();
-  void BuildCastOperator(const Operator* js_op);
+  void BuildCastOperator(const Operator* op);
   void BuildForInPrepare();
   void BuildForInNext();
 
   // Control flow plumbing.
   void BuildJump();
   void BuildConditionalJump(Node* condition);
   void BuildJumpIfEqual(Node* comperand);
   void BuildJumpIfToBooleanEqual(Node* boolean_comperand);
 
   // Simulates control flow by forward-propagating environments.
   void MergeIntoSuccessorEnvironment(int target_offset);
   void BuildLoopHeaderEnvironment(int current_offset);
   void SwitchToMergeEnvironment(int current_offset);
 
+  // Simulates control flow that exits the function body.
+  void MergeControlToLeaveFunction(Node* exit);
+
   // Simulates entry and exit of exception handlers.
   void EnterAndExitExceptionHandlers(int current_offset);
 
   // Attaches a frame state to |node| for the entry to the function.
   void PrepareEntryFrameState(Node* node);
 
   // Growth increment for the temporary buffer used to construct input lists to
   // new nodes.
   static const int kInputBufferSizeIncrement = 64;
 
@@ skipping 86 matching lines @@
   ZoneVector<Node*> exit_controls_;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeGraphBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_BYTECODE_GRAPH_BUILDER_H_