[interpreter] Switch context during stack unwinding.

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 155 matching lines @@
 
   // Growth increment for the temporary buffer used to construct input lists to
   // new nodes.
   static const int kInputBufferSizeIncrement = 64;
 
   // An abstract representation for an exception handler that is being
   // entered and exited while the graph builder is iterating over the
   // underlying bytecode. The exception handlers within the bytecode are
   // well scoped, hence will form a stack during iteration.
   struct ExceptionHandler {
-    int start_offset_;    // Start offset of the handled area in the bytecode.
-    int end_offset_;      // End offset of the handled area in the bytecode.
-    int handler_offset_;  // Handler entry offset within the bytecode.
+    int start_offset_;      // Start offset of the handled area in the bytecode.
+    int end_offset_;        // End offset of the handled area in the bytecode.
+    int handler_offset_;    // Handler entry offset within the bytecode.
+    int context_register_;  // Index of register holding handler context.
   };
 
   // Field accessors
   Graph* graph() const { return jsgraph_->graph(); }
   CommonOperatorBuilder* common() const { return jsgraph_->common(); }
   Zone* graph_zone() const { return graph()->zone(); }
   CompilationInfo* info() const { return info_; }
   JSGraph* jsgraph() const { return jsgraph_; }
   JSOperatorBuilder* javascript() const { return jsgraph_->javascript(); }
   Zone* local_zone() const { return local_zone_; }
@@ skipping 68 matching lines @@
   ZoneVector<Node*> exit_controls_;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeGraphBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_BYTECODE_GRAPH_BUILDER_H_