Debugger: make debug code on-stack replacement more robust.

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 752 matching lines @@
       return "encoded internal reference";
     case DEOPT_REASON:
       return "deopt reason";
     case CONST_POOL:
       return "constant pool";
     case VENEER_POOL:
       return "veneer pool";
     case DEBUG_BREAK_SLOT:
       return "debug break slot";
     case CODE_AGE_SEQUENCE:
-      return "code_age_sequence";
+      return "code age sequence";
+    case GENERATOR_CONTINUATION:
+      return "generator continuation";
     case NUMBER_OF_MODES:
     case PC_JUMP:
       UNREACHABLE();
       return "number_of_modes";
   }
   return "unknown relocation type";
 }
 
 
 void RelocInfo::Print(Isolate* isolate, std::ostream& os) {  // NOLINT
@@ skipping 80 matching lines @@
     case RUNTIME_ENTRY:
     case JS_RETURN:
     case COMMENT:
     case POSITION:
     case STATEMENT_POSITION:
     case EXTERNAL_REFERENCE:
     case DEOPT_REASON:
     case CONST_POOL:
     case VENEER_POOL:
     case DEBUG_BREAK_SLOT:
+    case GENERATOR_CONTINUATION:
     case NONE32:
     case NONE64:
       break;
     case NUMBER_OF_MODES:
     case PC_JUMP:
       UNREACHABLE();
       break;
     case CODE_AGE_SEQUENCE:
       DCHECK(Code::IsYoungSequence(isolate, pc_) || code_age_stub()->IsCode());
       break;
@@ skipping 930 matching lines @@
 }
 
 
 void Assembler::RecordJSReturn() {
   positions_recorder()->WriteRecordedPositions();
   EnsureSpace ensure_space(this);
   RecordRelocInfo(RelocInfo::JS_RETURN);
 }
 
 
+void Assembler::RecordGeneratorContinuation() {
+  EnsureSpace ensure_space(this);
+  RecordRelocInfo(RelocInfo::GENERATOR_CONTINUATION);
+}
+
+
 void Assembler::RecordDebugBreakSlot() {
   EnsureSpace ensure_space(this);
   intptr_t data = static_cast<intptr_t>(RelocInfo::kDebugBreakNonCallSentinel);
   RecordRelocInfo(RelocInfo::DEBUG_BREAK_SLOT, data);
 }
 
 
 void Assembler::RecordDebugBreakSlotForCall(int argc) {
   EnsureSpace ensure_space(this);
   intptr_t data = static_cast<intptr_t>(argc);
@@ skipping 10 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8