Fix warnings on Win64.

src/debug.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 90 matching lines @@
   bool first = break_point_ == -1;
   while (!RinfoDone()) {
     if (!first) RinfoNext();
     first = false;
     if (RinfoDone()) return;
 
     // Whenever a statement position or (plain) position is passed update the
     // current value of these.
     if (RelocInfo::IsPosition(rmode())) {
       if (RelocInfo::IsStatementPosition(rmode())) {
-        statement_position_ =
-            rinfo()->data() - debug_info_->shared()->start_position();
+        statement_position_ = static_cast<int>(
+            rinfo()->data() - debug_info_->shared()->start_position());
       }
       // Always update the position as we don't want that to be before the
       // statement position.
-      position_ = rinfo()->data() - debug_info_->shared()->start_position();
+      position_ = static_cast<int>(
+          rinfo()->data() - debug_info_->shared()->start_position());
       ASSERT(position_ >= 0);
       ASSERT(statement_position_ >= 0);
     }
 
     // Check for breakable code target. Look in the original code as setting
     // break points can cause the code targets in the running (debugged) code to
     // be of a different kind than in the original code.
     if (RelocInfo::IsCodeTarget(rmode())) {
       Address target = original_rinfo()->target_address();
       Code* code = Code::GetCodeFromTargetAddress(target);
@@ skipping 48 matching lines @@
 
 // Find the break point closest to the supplied address.
 void BreakLocationIterator::FindBreakLocationFromAddress(Address pc) {
   // Run through all break points to locate the one closest to the address.
   int closest_break_point = 0;
   int distance = kMaxInt;
   while (!Done()) {
     // Check if this break point is closer that what was previously found.
     if (this->pc() < pc && pc - this->pc() < distance) {
       closest_break_point = break_point();
-      distance = pc - this->pc();
+      distance = static_cast<int>(pc - this->pc());
       // Check whether we can't get any closer.
       if (distance == 0) break;
     }
     Next();
   }
 
   // Move to the break point found.
   Reset();
   Next(closest_break_point);
 }
@@ skipping 2516 matching lines @@
 
 
 void LockingCommandMessageQueue::Clear() {
   ScopedLock sl(lock_);
   queue_.Clear();
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal