[interpreter] Rename HandlerTable::depth field.

src/isolate.cc

 // Copyright 2012 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.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 1181 matching lines @@
     StackFrame* frame = iter.frame();
 
     // For JSEntryStub frames we update the JS_ENTRY handler.
     if (frame->is_entry() || frame->is_entry_construct()) {
       entry_handler = frame->top_handler()->next()->address();
     }
 
     // For JavaScript frames we perform a lookup in the handler table.
     if (frame->is_java_script()) {
       JavaScriptFrame* js_frame = static_cast<JavaScriptFrame*>(frame);
-      int stack_slots = 0;  // The computed stack slot count is not used.
       HandlerTable::CatchPrediction prediction;
-      if (js_frame->LookupExceptionHandlerInTable(&stack_slots, &prediction) >
-          0) {
+      if (js_frame->LookupExceptionHandlerInTable(nullptr, &prediction) > 0) {
         // We are conservative with our prediction: try-finally is considered
         // to always rethrow, to meet the expectation of the debugger.
         if (prediction == HandlerTable::CAUGHT) return CAUGHT_BY_JAVASCRIPT;
       }
     }
 
     // The exception has been externally caught if and only if there is an
     // external handler which is on top of the top-most JS_ENTRY handler.
     if (external_handler != nullptr && !try_catch_handler()->is_verbose_) {
       if (entry_handler == nullptr || entry_handler > external_handler) {
@@ skipping 389 matching lines @@
 
 Handle<Object> Isolate::GetPromiseOnStackOnThrow() {
   Handle<Object> undefined = factory()->undefined_value();
   ThreadLocalTop* tltop = thread_local_top();
   if (tltop->promise_on_stack_ == NULL) return undefined;
   Handle<JSFunction> promise_function = tltop->promise_on_stack_->function();
   // Find the top-most try-catch or try-finally handler.
   if (PredictExceptionCatcher() != CAUGHT_BY_JAVASCRIPT) return undefined;
   for (JavaScriptFrameIterator it(this); !it.done(); it.Advance()) {
     JavaScriptFrame* frame = it.frame();
-    int stack_slots = 0;  // The computed stack slot count is not used.
-    if (frame->LookupExceptionHandlerInTable(&stack_slots, NULL) > 0) {
+    if (frame->LookupExceptionHandlerInTable(nullptr, nullptr) > 0) {
       // Throwing inside a Promise only leads to a reject if not caught by an
       // inner try-catch or try-finally.
       if (frame->function() == *promise_function) {
         return tltop->promise_on_stack_->promise();
       }
       return undefined;
     }
   }
   return undefined;
 }
@@ skipping 1234 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8