[interpreter] First implementation of stack unwinding.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 4e42b436b1317022c966370fae99334736912e51..45a6c576cd216bdd200ff178b633b04553db243c 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1116,6 +1116,26 @@ Object* Isolate::UnwindAndFindHandler() {
       }
     }
 
+    // For interpreted frame we perform a range lookup in the handler table.
+    if (frame->is_interpreted() && catchable_by_js) {
+      InterpretedFrame* js_frame = static_cast<InterpretedFrame*>(frame);
+      int stack_slots = 0;  // Will contain stack slot count of frame.
+      offset = js_frame->LookupExceptionHandlerInTable(&stack_slots, NULL);
+      if (offset >= 0) {
+        // Patch the bytecode offset in the interpreted frame to reflect the
+        // position of the exception handler. The special builtin below will
+        // take care of continuing to dispatch at that position.
+        js_frame->PatchBytecodeOffset(static_cast<int>(offset));
+        offset = 0;
+
+        // Gather information from the frame.
+        code = *builtins()->InterpreterEnterExceptionHandler();
+        handler_sp = frame->sp();
+        handler_fp = frame->fp();
+        break;
+      }
+    }
+
     // For JavaScript frames we perform a range lookup in the handler table.
     if (frame->is_java_script() && catchable_by_js) {
       JavaScriptFrame* js_frame = static_cast<JavaScriptFrame*>(frame);