Debugger: correctly ensure debug info in Debug::Break.

src/debug/debug.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/v8.h"
 
 #include "src/debug/debug.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 562 matching lines @@
   if (break_disabled()) return;
 
   // Enter the debugger.
   DebugScope debug_scope(this);
   if (debug_scope.failed()) return;
 
   // Postpone interrupt during breakpoint processing.
   PostponeInterruptsScope postpone(isolate_);
 
   // Get the debug info (create it if it does not exist).
-  Handle<SharedFunctionInfo> shared =
-      Handle<SharedFunctionInfo>(frame->function()->shared());
+  Handle<JSFunction> function(frame->function());
+  Handle<SharedFunctionInfo> shared(function->shared());
+  if (!EnsureDebugInfo(shared, function)) {
+    // Return if we failed to retrieve the debug info.
+    return;
+  }
   Handle<DebugInfo> debug_info(shared->GetDebugInfo());
 
   // Find the break point where execution has stopped.
   // PC points to the instruction after the current one, possibly a break
   // location as well. So the "- 1" to exclude it from the search.
   Address call_pc = frame->pc() - 1;
   BreakLocation break_location =
       BreakLocation::FromAddress(debug_info, ALL_BREAK_LOCATIONS, call_pc);
 
   // Check whether step next reached a new statement.
@@ skipping 2210 matching lines @@
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8