Revert of [crankshaft] Fixing ES6 tail call elimination.

src/crankshaft/mips/lithium-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.
 
 #include "src/crankshaft/mips/lithium-mips.h"
 
 #include <sstream>
 
 #if V8_TARGET_ARCH_MIPS
 
@@ skipping 535 matching lines @@
 
 
 LInstruction* LChunkBuilder::DefineFixedDouble(
     LTemplateResultInstruction<1>* instr, DoubleRegister reg) {
   return Define(instr, ToUnallocated(reg));
 }
 
 
 LInstruction* LChunkBuilder::AssignEnvironment(LInstruction* instr) {
   HEnvironment* hydrogen_env = current_block_->last_environment();
-  return LChunkBuilderBase::AssignEnvironment(instr, hydrogen_env);
+  int argument_index_accumulator = 0;
+  ZoneList<HValue*> objects_to_materialize(0, zone());
+  instr->set_environment(CreateEnvironment(hydrogen_env,
+                                           &argument_index_accumulator,
+                                           &objects_to_materialize));
+  return instr;
 }
 
 
 LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
                                         HInstruction* hinstr,
                                         CanDeoptimize can_deoptimize) {
   info()->MarkAsNonDeferredCalling();
 #ifdef DEBUG
   instr->VerifyCall();
 #endif
@@ skipping 308 matching lines @@
 
   if (FLAG_stress_pointer_maps && !instr->HasPointerMap()) {
     instr = AssignPointerMap(instr);
   }
   if (FLAG_stress_environments && !instr->HasEnvironment()) {
     instr = AssignEnvironment(instr);
   }
   chunk_->AddInstruction(instr, current_block_);
 
   if (instr->IsCall()) {
-    HEnvironment* hydrogen_env = current_block_->last_environment();
     HValue* hydrogen_value_for_lazy_bailout = hydrogen_val;
-    DCHECK_NOT_NULL(hydrogen_env);
-    if (instr->IsTailCall()) {
-      hydrogen_env = hydrogen_env->outer();
-      if (hydrogen_env != nullptr &&
-          hydrogen_env->frame_type() == ARGUMENTS_ADAPTOR) {
-        hydrogen_env = hydrogen_env->outer();
-      }
-    } else {
-      if (hydrogen_val->HasObservableSideEffects()) {
-        HSimulate* sim = HSimulate::cast(hydrogen_val->next());
-        sim->ReplayEnvironment(hydrogen_env);
-        hydrogen_value_for_lazy_bailout = sim;
-      }
+    if (hydrogen_val->HasObservableSideEffects()) {
+      HSimulate* sim = HSimulate::cast(hydrogen_val->next());
+      sim->ReplayEnvironment(current_block_->last_environment());
+      hydrogen_value_for_lazy_bailout = sim;
     }
-    if (hydrogen_env != nullptr) {
-      LInstruction* bailout = LChunkBuilderBase::AssignEnvironment(
-          new (zone()) LLazyBailout(), hydrogen_env);
-      bailout->set_hydrogen_value(hydrogen_value_for_lazy_bailout);
-      chunk_->AddInstruction(bailout, current_block_);
-    }
+    LInstruction* bailout = AssignEnvironment(new(zone()) LLazyBailout());
+    bailout->set_hydrogen_value(hydrogen_value_for_lazy_bailout);
+    chunk_->AddInstruction(bailout, current_block_);
   }
 }
 
 
 LInstruction* LChunkBuilder::DoPrologue(HPrologue* instr) {
   LInstruction* result = new (zone()) LPrologue();
   if (info_->num_heap_slots() > 0) {
     result = MarkAsCall(result, instr);
   }
   return result;
@@ skipping 154 matching lines @@
        i < instr->OperandCount(); i++) {
     op =
         UseFixed(instr->OperandAt(i),
                  descriptor.GetRegisterParameter(
                      i - LCallWithDescriptor::kImplicitRegisterParameterCount));
     ops.Add(op, zone());
   }
 
   LCallWithDescriptor* result = new(zone()) LCallWithDescriptor(
       descriptor, ops, zone());
-  if (instr->syntactic_tail_call_mode() == TailCallMode::kAllow) {
-    result->MarkAsTailCall();
-  }
   return MarkAsCall(DefineFixed(result, v0), instr);
 }
 
 
 LInstruction* LChunkBuilder::DoInvokeFunction(HInvokeFunction* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
   LOperand* function = UseFixed(instr->function(), a1);
   LInvokeFunction* result = new(zone()) LInvokeFunction(context, function);
-  if (instr->syntactic_tail_call_mode() == TailCallMode::kAllow) {
-    result->MarkAsTailCall();
-  }
   return MarkAsCall(DefineFixed(result, v0), instr, CANNOT_DEOPTIMIZE_EAGERLY);
 }
 
 
 LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
   switch (instr->op()) {
     case kMathFloor:
       return DoMathFloor(instr);
     case kMathRound:
       return DoMathRound(instr);
@@ skipping 1406 matching lines @@
 
 LInstruction* LChunkBuilder::DoStoreFrameContext(HStoreFrameContext* instr) {
   LOperand* context = UseRegisterAtStart(instr->context());
   return new(zone()) LStoreFrameContext(context);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS