PPC: Handle StepIn for constructors through PrepareStep just like for regular calls

src/ppc/builtins-ppc.cc

 // Copyright 2014 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.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 357 matching lines @@
 
     // Preserve the incoming parameters on the stack.
     __ AssertUndefinedOrAllocationSite(r5, r7);
     __ SmiTag(r3);
     __ Push(r5, r3, r4, r6);
 
     // Try to allocate the object without transitioning into C code. If any of
     // the preconditions is not met, the code bails out to the runtime call.
     Label rt_call, allocated;
     if (FLAG_inline_new) {
-      ExternalReference debug_step_in_fp =
-          ExternalReference::debug_step_in_fp_address(isolate);
-      __ mov(r5, Operand(debug_step_in_fp));
-      __ LoadP(r5, MemOperand(r5));
-      __ cmpi(r5, Operand::Zero());
-      __ bne(&rt_call);
-
       // Verify that the new target is a JSFunction.
       __ CompareObjectType(r6, r8, r7, JS_FUNCTION_TYPE);
       __ bne(&rt_call);
 
       // Load the initial map and verify that it is in fact a map.
       // r6: new target
       __ LoadP(r5,
                FieldMemOperand(r6, JSFunction::kPrototypeOrInitialMapOffset));
       __ JumpIfSmi(r5, &rt_call);
       __ CompareObjectType(r5, r8, r7, MAP_TYPE);
@@ skipping 282 matching lines @@
     __ beq(&no_args, cr0);
     __ ShiftLeftImm(ip, r3, Operand(kPointerSizeLog2));
     __ mtctr(r3);
     __ bind(&loop);
     __ subi(ip, ip, Operand(kPointerSize));
     __ LoadPX(r0, MemOperand(r5, ip));
     __ push(r0);
     __ bdnz(&loop);
     __ bind(&no_args);
 
-    // Handle step in.
-    Label skip_step_in;
-    ExternalReference debug_step_in_fp =
-        ExternalReference::debug_step_in_fp_address(masm->isolate());
-    __ mov(r5, Operand(debug_step_in_fp));
-    __ LoadP(r5, MemOperand(r5));
-    __ and_(r0, r5, r5, SetRC);
-    __ beq(&skip_step_in, cr0);
-
-    __ Push(r3, r4, r4);
-    __ CallRuntime(Runtime::kHandleStepInForDerivedConstructors, 1);
-    __ Pop(r3, r4);
-
-    __ bind(&skip_step_in);
-
     // Call the function.
     // r3: number of arguments
     // r4: constructor function
     ParameterCount actual(r3);
     __ InvokeFunction(r4, actual, CALL_FUNCTION, NullCallWrapper());
 
     // Restore context from the frame.
     // r3: result
     // sp[0]: number of arguments (smi-tagged)
     __ LoadP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
@@ skipping 1251 matching lines @@
     __ bkpt(0);
   }
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC