new classes: no longer experimental.

src/ia32/builtins-ia32.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"
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
@@ skipping 521 matching lines @@
     Label loop, entry;
     __ mov(ecx, eax);
     __ jmp(&entry);
     __ bind(&loop);
     __ push(Operand(ebx, ecx, times_4, 0));
     __ bind(&entry);
     __ dec(ecx);
     __ j(greater_equal, &loop);
 
     __ inc(eax);  // Pushed new.target.
+
+
+    // Handle step in.
+    Label skip_step_in;
+    ExternalReference debug_step_in_fp =
+        ExternalReference::debug_step_in_fp_address(masm->isolate());
+    __ cmp(Operand::StaticVariable(debug_step_in_fp), Immediate(0));
+    __ j(equal, &skip_step_in);
+
+    __ push(eax);
+    __ push(edi);
+    __ push(edi);
+    __ CallRuntime(Runtime::kHandleStepInForDerivedConstructors, 1);
+    __ pop(edi);
+    __ pop(eax);
+
+    __ bind(&skip_step_in);
+
+    // Invoke function.
     ParameterCount actual(eax);
     __ InvokeFunction(edi, actual, CALL_FUNCTION, NullCallWrapper());
 
     // Restore context from the frame.
     __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
 
     __ mov(ebx, Operand(esp, 0));
   }
 
   __ pop(ecx);  // Return address.
@@ skipping 977 matching lines @@
 
   __ bind(&ok);
   __ ret(0);
 }
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32