Handle StepIn for constructors through PrepareStep just like for regular calls

src/full-codegen/mips/full-codegen-mips.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.
 
 #if V8_TARGET_ARCH_MIPS
 
 // Note on Mips implementation:
 //
 // The result_register() for mips is the 'v0' register, which is defined
 // by the ABI to contain function return values. However, the first
@@ skipping 3063 matching lines @@
 
   // Push the arguments ("left-to-right") on the stack.
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
   for (int i = 0; i < arg_count; i++) {
     VisitForStackValue(args->at(i));
   }
 
   // Call the construct call builtin that handles allocation and
   // constructor invocation.
-  SetConstructCallPosition(expr);
+  SetConstructCallPosition(expr, arg_count);
 
   // Load function and argument count into a1 and a0.
   __ li(a0, Operand(arg_count));
   __ lw(a1, MemOperand(sp, arg_count * kPointerSize));
 
   // Record call targets in unoptimized code.
   __ EmitLoadTypeFeedbackVector(a2);
   __ li(a3, Operand(SmiFromSlot(expr->CallNewFeedbackSlot())));
 
   CallConstructStub stub(isolate(), RECORD_CONSTRUCTOR_TARGET);
@@ skipping 15 matching lines @@
 
   // Push the arguments ("left-to-right") on the stack.
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
   for (int i = 0; i < arg_count; i++) {
     VisitForStackValue(args->at(i));
   }
 
   // Call the construct call builtin that handles allocation and
   // constructor invocation.
-  SetConstructCallPosition(expr);
+  SetConstructCallPosition(expr, arg_count);
 
   // Load new target into t0.
   VisitForAccumulatorValue(super_call_ref->new_target_var());
   __ mov(t0, result_register());
 
   // Load function and argument count into a1 and a0.
   __ li(a0, Operand(arg_count));
   __ lw(a1, MemOperand(sp, arg_count * kPointerSize));
 
   // Record call targets in unoptimized code.
@@ skipping 732 matching lines @@
 
 
 void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 2);
 
   // Evaluate new.target and super constructor.
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
 
+  // Call the construct call builtin that handles allocation and
+  // constructor invocation.
+  SetConstructCallPosition(expr, 0);
+
   // Load new target into a3.
   __ lw(a3, MemOperand(sp, 1 * kPointerSize));
 
   // Check if the calling frame is an arguments adaptor frame.
   Label adaptor_frame, args_set_up, runtime;
   __ lw(a2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   __ lw(t0, MemOperand(a2, StandardFrameConstants::kContextOffset));
   __ Branch(&adaptor_frame, eq, t0,
             Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
   // default constructor has no arguments, so no adaptor frame means no args.
@@ skipping 1172 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS