More precise break points and stepping when debugging...

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 431 matching lines @@
     case RelocInfo::COMMENT:
       return "comment";
     case RelocInfo::POSITION:
       return "position";
     case RelocInfo::STATEMENT_POSITION:
       return "statement position";
     case RelocInfo::EXTERNAL_REFERENCE:
       return "external reference";
     case RelocInfo::INTERNAL_REFERENCE:
       return "internal reference";
+    case RelocInfo::DEBUG_BREAK_SLOT:
+#ifndef ENABLE_DEBUGGER_SUPPORT
+      UNREACHABLE();
+#endif
+      return "debug break slot";
     case RelocInfo::NUMBER_OF_MODES:
       UNREACHABLE();
       return "number_of_modes";
   }
   return "unknown relocation type";
 }
 
 
 void RelocInfo::Print() {
   PrintF("%p  %s", pc_, RelocModeName(rmode_));
@@ skipping 44 matching lines @@
       ASSERT(code->address() == HeapObject::cast(found)->address());
       break;
     }
     case RUNTIME_ENTRY:
     case JS_RETURN:
     case COMMENT:
     case POSITION:
     case STATEMENT_POSITION:
     case EXTERNAL_REFERENCE:
     case INTERNAL_REFERENCE:
+    case DEBUG_BREAK_SLOT:
     case NONE:
       break;
     case NUMBER_OF_MODES:
       UNREACHABLE();
       break;
   }
 }
 #endif  // DEBUG
 
 
@@ skipping 260 matching lines @@
   return ExternalReference(Redirect(FUNCTION_ADDR(Debug::Break)));
 }
 
 
 ExternalReference ExternalReference::debug_step_in_fp_address() {
   return ExternalReference(Debug::step_in_fp_addr());
 }
 #endif
 
 } }  // namespace v8::internal