[interpreter] First implementation of stack unwinding.

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index 0b74a8dd3b8a100a40ea16598c06858f1b8aad42..db6acc2505a3f2c32718cbea7ca90812372b6318 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -917,17 +917,8 @@ void BytecodeGenerator::VisitTryCatchStatement(TryCatchStatement* stmt) {
   // TODO(mstarzinger): Implement this!
 
   // Create a catch scope that binds the exception.
-  register_allocator()->PrepareForConsecutiveAllocations(3);
-  Register name = register_allocator()->NextConsecutiveRegister();
-  Register exception = register_allocator()->NextConsecutiveRegister();
-  Register closure = register_allocator()->NextConsecutiveRegister();
-  builder()
-      ->StoreAccumulatorInRegister(exception)
-      .LoadLiteral(stmt->variable()->name())
-      .StoreAccumulatorInRegister(name);
-  VisitFunctionClosureForContext();
-  builder()->StoreAccumulatorInRegister(closure).CallRuntime(
-      Runtime::kPushCatchContext, name, 3);
+  VisitNewLocalCatchContext(stmt->variable());
+  ContextScope scope(this, stmt->scope());
 
   // Evaluate the catch-block.
   Visit(stmt->catch_block());
@@ -2123,6 +2114,27 @@ void BytecodeGenerator::VisitNewLocalBlockContext(Scope* scope) {
 }
 
 
+void BytecodeGenerator::VisitNewLocalCatchContext(Variable* variable) {
+  AccumulatorResultScope accumulator_execution_result(this);
+  DCHECK(variable->IsContextSlot());
+
+  // Allocate a new local block context.
+  register_allocator()->PrepareForConsecutiveAllocations(3);
+  Register name = register_allocator()->NextConsecutiveRegister();
+  Register exception = register_allocator()->NextConsecutiveRegister();
+  Register closure = register_allocator()->NextConsecutiveRegister();
+
+  builder()
+      ->StoreAccumulatorInRegister(exception)
+      .LoadLiteral(variable->name())
+      .StoreAccumulatorInRegister(name);
+  VisitFunctionClosureForContext();
+  builder()->StoreAccumulatorInRegister(closure).CallRuntime(
+      Runtime::kPushCatchContext, name, 3);
+  execution_result()->SetResultInAccumulator();
+}
+
+
 void BytecodeGenerator::VisitObjectLiteralAccessor(
     Register home_object, ObjectLiteralProperty* property, Register value_out) {
   // TODO(rmcilroy): Replace value_out with VisitForRegister();