X87: [Interpreter] Remove InterpreterExitTrampoline and replace with returning to the entry trampol…

src/full-codegen/x87/full-codegen-x87.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_X87
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 150 matching lines @@
   // Possibly allocate a local context.
   if (info->scope()->num_heap_slots() > 0) {
     Comment cmnt(masm_, "[ Allocate context");
     bool need_write_barrier = true;
     int slots = info->scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
     // Argument to NewContext is the function, which is still in edi.
     if (info->scope()->is_script_scope()) {
       __ push(edi);
       __ Push(info->scope()->GetScopeInfo(info->isolate()));
       __ CallRuntime(Runtime::kNewScriptContext);
-      PrepareForBailoutForId(BailoutId::ScriptContext(), TOS_REG);
+      PrepareForBailoutForId(BailoutId::ScriptContext(),
+                             BailoutState::TOS_REGISTER);
       // The new target value is not used, clobbering is safe.
       DCHECK_NULL(info->scope()->new_target_var());
     } else {
       if (info->scope()->new_target_var() != nullptr) {
         __ push(edx);  // Preserve new target.
       }
       if (slots <= FastNewContextStub::kMaximumSlots) {
         FastNewContextStub stub(isolate(), slots);
         __ CallStub(&stub);
         // Result of FastNewContextStub is always in new space.
@@ skipping 35 matching lines @@
           __ Abort(kExpectedNewSpaceObject);
           __ bind(&done);
         }
       }
     }
   }
 
   // Register holding this function and new target are both trashed in case we
   // bailout here. But since that can happen only when new target is not used
   // and we allocate a context, the value of |function_in_register| is correct.
-  PrepareForBailoutForId(BailoutId::FunctionContext(), NO_REGISTERS);
+  PrepareForBailoutForId(BailoutId::FunctionContext(),
+                         BailoutState::NO_REGISTERS);
 
   // Possibly set up a local binding to the this function which is used in
   // derived constructors with super calls.
   Variable* this_function_var = scope()->this_function_var();
   if (this_function_var != nullptr) {
     Comment cmnt(masm_, "[ This function");
     if (!function_in_register) {
       __ mov(edi, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
       // The write barrier clobbers register again, keep it marked as such.
     }
@@ skipping 41 matching lines @@
     }
 
     SetVar(arguments, eax, ebx, edx);
   }
 
   if (FLAG_trace) {
     __ CallRuntime(Runtime::kTraceEnter);
   }
 
   // Visit the declarations and body.
-  PrepareForBailoutForId(BailoutId::FunctionEntry(), NO_REGISTERS);
+  PrepareForBailoutForId(BailoutId::FunctionEntry(),
+                         BailoutState::NO_REGISTERS);
   {
     Comment cmnt(masm_, "[ Declarations");
     VisitDeclarations(scope()->declarations());
   }
 
   // Assert that the declarations do not use ICs. Otherwise the debugger
   // won't be able to redirect a PC at an IC to the correct IC in newly
   // recompiled code.
   DCHECK_EQ(0, ic_total_count_);
 
   {
     Comment cmnt(masm_, "[ Stack check");
-    PrepareForBailoutForId(BailoutId::Declarations(), NO_REGISTERS);
+    PrepareForBailoutForId(BailoutId::Declarations(),
+                           BailoutState::NO_REGISTERS);
     Label ok;
     ExternalReference stack_limit =
         ExternalReference::address_of_stack_limit(isolate());
     __ cmp(esp, Operand::StaticVariable(stack_limit));
     __ j(above_equal, &ok, Label::kNear);
     __ call(isolate()->builtins()->StackCheck(), RelocInfo::CODE_TARGET);
     __ bind(&ok);
   }
 
   {
@@ skipping 46 matching lines @@
   __ call(isolate()->builtins()->InterruptCheck(), RelocInfo::CODE_TARGET);
 
   // Record a mapping of this PC offset to the OSR id.  This is used to find
   // the AST id from the unoptimized code in order to use it as a key into
   // the deoptimization input data found in the optimized code.
   RecordBackEdge(stmt->OsrEntryId());
 
   EmitProfilingCounterReset();
 
   __ bind(&ok);
-  PrepareForBailoutForId(stmt->EntryId(), NO_REGISTERS);
+  PrepareForBailoutForId(stmt->EntryId(), BailoutState::NO_REGISTERS);
   // Record a mapping of the OSR id to this PC.  This is used if the OSR
   // entry becomes the target of a bailout.  We don't expect it to be, but
   // we want it to work if it is.
-  PrepareForBailoutForId(stmt->OsrEntryId(), NO_REGISTERS);
+  PrepareForBailoutForId(stmt->OsrEntryId(), BailoutState::NO_REGISTERS);
 }
 
 void FullCodeGenerator::EmitProfilingCounterHandlingForReturnSequence(
     bool is_tail_call) {
   // Pretend that the exit is a backwards jump to the entry.
   int weight = 1;
   if (info_->ShouldSelfOptimize()) {
     weight = FLAG_interrupt_budget / FLAG_self_opt_count;
   } else {
     int distance = masm_->pc_offset();
@@ skipping 286 matching lines @@
                                                      bool should_normalize,
                                                      Label* if_true,
                                                      Label* if_false) {
   // Only prepare for bailouts before splits if we're in a test
   // context. Otherwise, we let the Visit function deal with the
   // preparation to avoid preparing with the same AST id twice.
   if (!context()->IsTest()) return;
 
   Label skip;
   if (should_normalize) __ jmp(&skip, Label::kNear);
-  PrepareForBailout(expr, TOS_REG);
+  PrepareForBailout(expr, BailoutState::TOS_REGISTER);
   if (should_normalize) {
     __ cmp(eax, isolate()->factory()->true_value());
     Split(equal, if_true, if_false, NULL);
     __ bind(&skip);
   }
 }
 
 
 void FullCodeGenerator::EmitDebugCheckDeclarationContext(Variable* variable) {
   // The variable in the declaration always resides in the current context.
@@ skipping 35 matching lines @@
       }
       break;
 
     case VariableLocation::CONTEXT:
       if (hole_init) {
         Comment cmnt(masm_, "[ VariableDeclaration");
         EmitDebugCheckDeclarationContext(variable);
         __ mov(ContextOperand(esi, variable->index()),
                Immediate(isolate()->factory()->the_hole_value()));
         // No write barrier since the hole value is in old space.
-        PrepareForBailoutForId(proxy->id(), NO_REGISTERS);
+        PrepareForBailoutForId(proxy->id(), BailoutState::NO_REGISTERS);
       }
       break;
 
     case VariableLocation::LOOKUP: {
       Comment cmnt(masm_, "[ VariableDeclaration");
       __ push(Immediate(variable->name()));
       // VariableDeclaration nodes are always introduced in one of four modes.
       DCHECK(IsDeclaredVariableMode(mode));
       // Push initial value, if any.
       // Note: For variables we must not push an initial value (such as
       // 'undefined') because we may have a (legal) redeclaration and we
       // must not destroy the current value.
       if (hole_init) {
         __ push(Immediate(isolate()->factory()->the_hole_value()));
       } else {
         __ push(Immediate(Smi::FromInt(0)));  // Indicates no initial value.
       }
       __ push(
           Immediate(Smi::FromInt(variable->DeclarationPropertyAttributes())));
       __ CallRuntime(Runtime::kDeclareLookupSlot);
-      PrepareForBailoutForId(proxy->id(), NO_REGISTERS);
+      PrepareForBailoutForId(proxy->id(), BailoutState::NO_REGISTERS);
       break;
     }
   }
 }
 
 void FullCodeGenerator::VisitFunctionDeclaration(
     FunctionDeclaration* declaration) {
   VariableProxy* proxy = declaration->proxy();
   Variable* variable = proxy->var();
   switch (variable->location()) {
@@ skipping 18 matching lines @@
 
     case VariableLocation::CONTEXT: {
       Comment cmnt(masm_, "[ FunctionDeclaration");
       EmitDebugCheckDeclarationContext(variable);
       VisitForAccumulatorValue(declaration->fun());
       __ mov(ContextOperand(esi, variable->index()), result_register());
       // We know that we have written a function, which is not a smi.
       __ RecordWriteContextSlot(esi, Context::SlotOffset(variable->index()),
                                 result_register(), ecx, kDontSaveFPRegs,
                                 EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
-      PrepareForBailoutForId(proxy->id(), NO_REGISTERS);
+      PrepareForBailoutForId(proxy->id(), BailoutState::NO_REGISTERS);
       break;
     }
 
     case VariableLocation::LOOKUP: {
       Comment cmnt(masm_, "[ FunctionDeclaration");
       PushOperand(variable->name());
       VisitForStackValue(declaration->fun());
       PushOperand(Smi::FromInt(variable->DeclarationPropertyAttributes()));
       CallRuntimeWithOperands(Runtime::kDeclareLookupSlot);
-      PrepareForBailoutForId(proxy->id(), NO_REGISTERS);
+      PrepareForBailoutForId(proxy->id(), BailoutState::NO_REGISTERS);
       break;
     }
   }
 }
 
 
 void FullCodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
   // Call the runtime to declare the globals.
   __ Push(pairs);
   __ Push(Smi::FromInt(DeclareGlobalsFlags()));
@@ skipping 10 matching lines @@
 }
 
 
 void FullCodeGenerator::VisitSwitchStatement(SwitchStatement* stmt) {
   Comment cmnt(masm_, "[ SwitchStatement");
   Breakable nested_statement(this, stmt);
   SetStatementPosition(stmt);
 
   // Keep the switch value on the stack until a case matches.
   VisitForStackValue(stmt->tag());
-  PrepareForBailoutForId(stmt->EntryId(), NO_REGISTERS);
+  PrepareForBailoutForId(stmt->EntryId(), BailoutState::NO_REGISTERS);
 
   ZoneList<CaseClause*>* clauses = stmt->cases();
   CaseClause* default_clause = NULL;  // Can occur anywhere in the list.
 
   Label next_test;  // Recycled for each test.
   // Compile all the tests with branches to their bodies.
   for (int i = 0; i < clauses->length(); i++) {
     CaseClause* clause = clauses->at(i);
     clause->body_target()->Unuse();
 
@@ skipping 28 matching lines @@
     }
 
     SetExpressionPosition(clause);
     Handle<Code> ic =
         CodeFactory::CompareIC(isolate(), Token::EQ_STRICT).code();
     CallIC(ic, clause->CompareId());
     patch_site.EmitPatchInfo();
 
     Label skip;
     __ jmp(&skip, Label::kNear);
-    PrepareForBailout(clause, TOS_REG);
+    PrepareForBailout(clause, BailoutState::TOS_REGISTER);
     __ cmp(eax, isolate()->factory()->true_value());
     __ j(not_equal, &next_test);
     __ Drop(1);
     __ jmp(clause->body_target());
     __ bind(&skip);
 
     __ test(eax, eax);
     __ j(not_equal, &next_test);
     __ Drop(1);  // Switch value is no longer needed.
     __ jmp(clause->body_target());
   }
 
   // Discard the test value and jump to the default if present, otherwise to
   // the end of the statement.
   __ bind(&next_test);
   DropOperands(1);  // Switch value is no longer needed.
   if (default_clause == NULL) {
     __ jmp(nested_statement.break_label());
   } else {
     __ jmp(default_clause->body_target());
   }
 
   // Compile all the case bodies.
   for (int i = 0; i < clauses->length(); i++) {
     Comment cmnt(masm_, "[ Case body");
     CaseClause* clause = clauses->at(i);
     __ bind(clause->body_target());
-    PrepareForBailoutForId(clause->EntryId(), NO_REGISTERS);
+    PrepareForBailoutForId(clause->EntryId(), BailoutState::NO_REGISTERS);
     VisitStatements(clause->statements());
   }
 
   __ bind(nested_statement.break_label());
-  PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS);
+  PrepareForBailoutForId(stmt->ExitId(), BailoutState::NO_REGISTERS);
 }
 
 
 void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   Comment cmnt(masm_, "[ ForInStatement");
   SetStatementPosition(stmt, SKIP_BREAK);
 
   FeedbackVectorSlot slot = stmt->ForInFeedbackSlot();
 
   // Get the object to enumerate over.
@@ skipping 12 matching lines @@
   __ CmpObjectType(eax, FIRST_JS_RECEIVER_TYPE, ecx);
   __ j(above_equal, &done_convert, Label::kNear);
   __ cmp(eax, isolate()->factory()->undefined_value());
   __ j(equal, &exit);
   __ cmp(eax, isolate()->factory()->null_value());
   __ j(equal, &exit);
   __ bind(&convert);
   ToObjectStub stub(isolate());
   __ CallStub(&stub);
   __ bind(&done_convert);
-  PrepareForBailoutForId(stmt->ToObjectId(), TOS_REG);
+  PrepareForBailoutForId(stmt->ToObjectId(), BailoutState::TOS_REGISTER);
   __ push(eax);
 
   // Check cache validity in generated code. If we cannot guarantee cache
   // validity, call the runtime system to check cache validity or get the
   // property names in a fixed array. Note: Proxies never have an enum cache,
   // so will always take the slow path.
   Label call_runtime, use_cache, fixed_array;
   __ CheckEnumCache(&call_runtime);
 
   __ mov(eax, FieldOperand(eax, HeapObject::kMapOffset));
   __ jmp(&use_cache, Label::kNear);
 
   // Get the set of properties to enumerate.
   __ bind(&call_runtime);
   __ push(eax);
   __ CallRuntime(Runtime::kForInEnumerate);
-  PrepareForBailoutForId(stmt->EnumId(), TOS_REG);
+  PrepareForBailoutForId(stmt->EnumId(), BailoutState::TOS_REGISTER);
   __ cmp(FieldOperand(eax, HeapObject::kMapOffset),
          isolate()->factory()->meta_map());
   __ j(not_equal, &fixed_array);
 
 
   // We got a map in register eax. Get the enumeration cache from it.
   Label no_descriptors;
   __ bind(&use_cache);
 
   __ EnumLength(edx, eax);
@@ skipping 11 matching lines @@
   __ push(Immediate(Smi::FromInt(0)));  // Initial index.
   __ jmp(&loop);
 
   __ bind(&no_descriptors);
   __ add(esp, Immediate(kPointerSize));
   __ jmp(&exit);
 
   // We got a fixed array in register eax. Iterate through that.
   __ bind(&fixed_array);
 
-  __ push(Immediate(Smi::FromInt(1)));  // Smi(1) undicates slow check
+  __ push(Immediate(Smi::FromInt(1)));  // Smi(1) indicates slow check
   __ push(eax);  // Array
   __ mov(eax, FieldOperand(eax, FixedArray::kLengthOffset));
   __ push(eax);  // Fixed array length (as smi).
-  PrepareForBailoutForId(stmt->PrepareId(), NO_REGISTERS);
+  PrepareForBailoutForId(stmt->PrepareId(), BailoutState::NO_REGISTERS);
   __ push(Immediate(Smi::FromInt(0)));  // Initial index.
 
   // Generate code for doing the condition check.
   __ bind(&loop);
   SetExpressionAsStatementPosition(stmt->each());
 
   __ mov(eax, Operand(esp, 0 * kPointerSize));  // Get the current index.
   __ cmp(eax, Operand(esp, 1 * kPointerSize));  // Compare to the array length.
   __ j(above_equal, loop_statement.break_label());
 
@@ skipping 17 matching lines @@
   __ EmitLoadTypeFeedbackVector(edx);
   __ mov(FieldOperand(edx, FixedArray::OffsetOfElementAt(vector_index)),
          Immediate(TypeFeedbackVector::MegamorphicSentinel(isolate())));
 
   // Convert the entry to a string or null if it isn't a property
   // anymore. If the property has been removed while iterating, we
   // just skip it.
   __ push(ecx);  // Enumerable.
   __ push(ebx);  // Current entry.
   __ CallRuntime(Runtime::kForInFilter);
-  PrepareForBailoutForId(stmt->FilterId(), TOS_REG);
+  PrepareForBailoutForId(stmt->FilterId(), BailoutState::TOS_REGISTER);
   __ cmp(eax, isolate()->factory()->undefined_value());
   __ j(equal, loop_statement.continue_label());
   __ mov(ebx, eax);
 
   // Update the 'each' property or variable from the possibly filtered
   // entry in register ebx.
   __ bind(&update_each);
   __ mov(result_register(), ebx);
   // Perform the assignment as if via '='.
   { EffectContext context(this);
     EmitAssignment(stmt->each(), stmt->EachFeedbackSlot());
-    PrepareForBailoutForId(stmt->AssignmentId(), NO_REGISTERS);
+    PrepareForBailoutForId(stmt->AssignmentId(), BailoutState::NO_REGISTERS);
   }
 
   // Both Crankshaft and Turbofan expect BodyId to be right before stmt->body().
-  PrepareForBailoutForId(stmt->BodyId(), NO_REGISTERS);
+  PrepareForBailoutForId(stmt->BodyId(), BailoutState::NO_REGISTERS);
   // Generate code for the body of the loop.
   Visit(stmt->body());
 
   // Generate code for going to the next element by incrementing the
   // index (smi) stored on top of the stack.
   __ bind(loop_statement.continue_label());
   __ add(Operand(esp, 0 * kPointerSize), Immediate(Smi::FromInt(1)));
 
   EmitBackEdgeBookkeeping(stmt, &loop);
   __ jmp(&loop);
 
   // Remove the pointers stored on the stack.
   __ bind(loop_statement.break_label());
   DropOperands(5);
 
   // Exit and decrement the loop depth.
-  PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS);
+  PrepareForBailoutForId(stmt->ExitId(), BailoutState::NO_REGISTERS);
   __ bind(&exit);
   decrement_loop_depth();
 }
 
 
 void FullCodeGenerator::EmitSetHomeObject(Expression* initializer, int offset,
                                           FeedbackVectorSlot slot) {
   DCHECK(NeedsHomeObject(initializer));
   __ mov(StoreDescriptor::ReceiverRegister(), Operand(esp, 0));
   __ mov(StoreDescriptor::NameRegister(),
@@ skipping 137 matching lines @@
   __ mov(LoadDescriptor::NameRegister(), var->name());
   __ mov(LoadDescriptor::SlotRegister(),
          Immediate(SmiFromSlot(proxy->VariableFeedbackSlot())));
   CallLoadIC(typeof_mode);
 }
 
 
 void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy,
                                          TypeofMode typeof_mode) {
   SetExpressionPosition(proxy);
-  PrepareForBailoutForId(proxy->BeforeId(), NO_REGISTERS);
+  PrepareForBailoutForId(proxy->BeforeId(), BailoutState::NO_REGISTERS);
   Variable* var = proxy->var();
 
   // Three cases: global variables, lookup variables, and all other types of
   // variables.
   switch (var->location()) {
     case VariableLocation::GLOBAL:
     case VariableLocation::UNALLOCATED: {
       Comment cmnt(masm_, "[ Global variable");
       EmitGlobalVariableLoad(proxy, typeof_mode);
       context()->Plug(eax);
@@ skipping 91 matching lines @@
     __ CallRuntime(Runtime::kCreateObjectLiteral);
   } else {
     __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
     __ mov(ebx, Immediate(Smi::FromInt(expr->literal_index())));
     __ mov(ecx, Immediate(constant_properties));
     __ mov(edx, Immediate(Smi::FromInt(flags)));
     FastCloneShallowObjectStub stub(isolate(), expr->properties_count());
     __ CallStub(&stub);
     RestoreContext();
   }
-  PrepareForBailoutForId(expr->CreateLiteralId(), TOS_REG);
+  PrepareForBailoutForId(expr->CreateLiteralId(), BailoutState::TOS_REGISTER);
 
   // If result_saved is true the result is on top of the stack.  If
   // result_saved is false the result is in eax.
   bool result_saved = false;
 
   AccessorTable accessor_table(zone());
   int property_index = 0;
   for (; property_index < expr->properties()->length(); property_index++) {
     ObjectLiteral::Property* property = expr->properties()->at(property_index);
     if (property->is_computed_name()) break;
@@ skipping 15 matching lines @@
         // It is safe to use [[Put]] here because the boilerplate already
         // contains computed properties with an uninitialized value.
         if (key->value()->IsInternalizedString()) {
           if (property->emit_store()) {
             VisitForAccumulatorValue(value);
             DCHECK(StoreDescriptor::ValueRegister().is(eax));
             __ mov(StoreDescriptor::NameRegister(), Immediate(key->value()));
             __ mov(StoreDescriptor::ReceiverRegister(), Operand(esp, 0));
             EmitLoadStoreICSlot(property->GetSlot(0));
             CallStoreIC();
-            PrepareForBailoutForId(key->id(), NO_REGISTERS);
+            PrepareForBailoutForId(key->id(), BailoutState::NO_REGISTERS);
             if (NeedsHomeObject(value)) {
               EmitSetHomeObjectAccumulator(value, 0, property->GetSlot(1));
             }
           } else {
             VisitForEffect(value);
           }
           break;
         }
         PushOperand(Operand(esp, 0));  // Duplicate receiver.
         VisitForStackValue(key);
         VisitForStackValue(value);
         if (property->emit_store()) {
           if (NeedsHomeObject(value)) {
             EmitSetHomeObject(value, 2, property->GetSlot());
           }
           PushOperand(Smi::FromInt(SLOPPY));  // Language mode
           CallRuntimeWithOperands(Runtime::kSetProperty);
         } else {
           DropOperands(3);
         }
         break;
       case ObjectLiteral::Property::PROTOTYPE:
         PushOperand(Operand(esp, 0));  // Duplicate receiver.
         VisitForStackValue(value);
         DCHECK(property->emit_store());
         CallRuntimeWithOperands(Runtime::kInternalSetPrototype);
         PrepareForBailoutForId(expr->GetIdForPropertySet(property_index),
-                               NO_REGISTERS);
+                               BailoutState::NO_REGISTERS);
         break;
       case ObjectLiteral::Property::GETTER:
         if (property->emit_store()) {
           accessor_table.lookup(key)->second->getter = property;
         }
         break;
       case ObjectLiteral::Property::SETTER:
         if (property->emit_store()) {
           accessor_table.lookup(key)->second->setter = property;
         }
@@ skipping 35 matching lines @@
     }
 
     PushOperand(Operand(esp, 0));  // Duplicate receiver.
 
     if (property->kind() == ObjectLiteral::Property::PROTOTYPE) {
       DCHECK(!property->is_computed_name());
       VisitForStackValue(value);
       DCHECK(property->emit_store());
       CallRuntimeWithOperands(Runtime::kInternalSetPrototype);
       PrepareForBailoutForId(expr->GetIdForPropertySet(property_index),
-                             NO_REGISTERS);
+                             BailoutState::NO_REGISTERS);
     } else {
       EmitPropertyKey(property, expr->GetIdForPropertyName(property_index));
       VisitForStackValue(value);
       if (NeedsHomeObject(value)) {
         EmitSetHomeObject(value, 2, property->GetSlot());
       }
 
       switch (property->kind()) {
         case ObjectLiteral::Property::CONSTANT:
         case ObjectLiteral::Property::MATERIALIZED_LITERAL:
@@ skipping 52 matching lines @@
     __ push(Immediate(constant_elements));
     __ push(Immediate(Smi::FromInt(expr->ComputeFlags())));
     __ CallRuntime(Runtime::kCreateArrayLiteral);
   } else {
     __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
     __ mov(ebx, Immediate(Smi::FromInt(expr->literal_index())));
     __ mov(ecx, Immediate(constant_elements));
     FastCloneShallowArrayStub stub(isolate(), allocation_site_mode);
     __ CallStub(&stub);
   }
-  PrepareForBailoutForId(expr->CreateLiteralId(), TOS_REG);
+  PrepareForBailoutForId(expr->CreateLiteralId(), BailoutState::TOS_REGISTER);
 
   bool result_saved = false;  // Is the result saved to the stack?
   ZoneList<Expression*>* subexprs = expr->values();
   int length = subexprs->length();
 
   // Emit code to evaluate all the non-constant subexpressions and to store
   // them into the newly cloned array.
   int array_index = 0;
   for (; array_index < length; array_index++) {
     Expression* subexpr = subexprs->at(array_index);
     DCHECK(!subexpr->IsSpread());
 
     // If the subexpression is a literal or a simple materialized literal it
     // is already set in the cloned array.
     if (CompileTimeValue::IsCompileTimeValue(subexpr)) continue;
 
     if (!result_saved) {
       PushOperand(eax);  // array literal.
       result_saved = true;
     }
     VisitForAccumulatorValue(subexpr);
 
     __ mov(StoreDescriptor::NameRegister(),
            Immediate(Smi::FromInt(array_index)));
     __ mov(StoreDescriptor::ReceiverRegister(), Operand(esp, 0));
     EmitLoadStoreICSlot(expr->LiteralFeedbackSlot());
     Handle<Code> ic =
         CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
     CallIC(ic);
-    PrepareForBailoutForId(expr->GetIdForElement(array_index), NO_REGISTERS);
+    PrepareForBailoutForId(expr->GetIdForElement(array_index),
+                           BailoutState::NO_REGISTERS);
   }
 
   // In case the array literal contains spread expressions it has two parts. The
   // first part is  the "static" array which has a literal index is  handled
   // above. The second part is the part after the first spread expression
   // (inclusive) and these elements gets appended to the array. Note that the
   // number elements an iterable produces is unknown ahead of time.
   if (array_index < length && result_saved) {
     PopOperand(eax);
     result_saved = false;
   }
   for (; array_index < length; array_index++) {
     Expression* subexpr = subexprs->at(array_index);
 
     PushOperand(eax);
     DCHECK(!subexpr->IsSpread());
     VisitForStackValue(subexpr);
     CallRuntimeWithOperands(Runtime::kAppendElement);
 
-    PrepareForBailoutForId(expr->GetIdForElement(array_index), NO_REGISTERS);
+    PrepareForBailoutForId(expr->GetIdForElement(array_index),
+                           BailoutState::NO_REGISTERS);
   }
 
   if (result_saved) {
     context()->PlugTOS();
   } else {
     context()->Plug(eax);
   }
 }
 
 
@@ skipping 58 matching lines @@
   }
 
   // For compound assignments we need another deoptimization point after the
   // variable/property load.
   if (expr->is_compound()) {
     AccumulatorValueContext result_context(this);
     { AccumulatorValueContext left_operand_context(this);
       switch (assign_type) {
         case VARIABLE:
           EmitVariableLoad(expr->target()->AsVariableProxy());
-          PrepareForBailout(expr->target(), TOS_REG);
+          PrepareForBailout(expr->target(), BailoutState::TOS_REGISTER);
           break;
         case NAMED_SUPER_PROPERTY:
           EmitNamedSuperPropertyLoad(property);
-          PrepareForBailoutForId(property->LoadId(), TOS_REG);
+          PrepareForBailoutForId(property->LoadId(),
+                                 BailoutState::TOS_REGISTER);
           break;
         case NAMED_PROPERTY:
           EmitNamedPropertyLoad(property);
-          PrepareForBailoutForId(property->LoadId(), TOS_REG);
+          PrepareForBailoutForId(property->LoadId(),
+                                 BailoutState::TOS_REGISTER);
           break;
         case KEYED_SUPER_PROPERTY:
           EmitKeyedSuperPropertyLoad(property);
-          PrepareForBailoutForId(property->LoadId(), TOS_REG);
+          PrepareForBailoutForId(property->LoadId(),
+                                 BailoutState::TOS_REGISTER);
           break;
         case KEYED_PROPERTY:
           EmitKeyedPropertyLoad(property);
-          PrepareForBailoutForId(property->LoadId(), TOS_REG);
+          PrepareForBailoutForId(property->LoadId(),
+                                 BailoutState::TOS_REGISTER);
           break;
       }
     }
 
     Token::Value op = expr->binary_op();
     PushOperand(eax);  // Left operand goes on the stack.
     VisitForAccumulatorValue(expr->value());
 
     if (ShouldInlineSmiCase(op)) {
       EmitInlineSmiBinaryOp(expr->binary_operation(),
                             op,
                             expr->target(),
                             expr->value());
     } else {
       EmitBinaryOp(expr->binary_operation(), op);
     }
 
     // Deoptimization point in case the binary operation may have side effects.
-    PrepareForBailout(expr->binary_operation(), TOS_REG);
+    PrepareForBailout(expr->binary_operation(), BailoutState::TOS_REGISTER);
   } else {
     VisitForAccumulatorValue(expr->value());
   }
 
   SetExpressionPosition(expr);
 
   // Store the value.
   switch (assign_type) {
     case VARIABLE:
       EmitVariableAssignment(expr->target()->AsVariableProxy()->var(),
                              expr->op(), expr->AssignmentSlot());
-      PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+      PrepareForBailoutForId(expr->AssignmentId(), BailoutState::TOS_REGISTER);
       context()->Plug(eax);
       break;
     case NAMED_PROPERTY:
       EmitNamedPropertyAssignment(expr);
       break;
     case NAMED_SUPER_PROPERTY:
       EmitNamedSuperPropertyStore(property);
       context()->Plug(result_register());
       break;
     case KEYED_SUPER_PROPERTY:
@@ skipping 438 matching lines @@
   // eax    : value
   // esp[0] : receiver
   Property* prop = expr->target()->AsProperty();
   DCHECK(prop != NULL);
   DCHECK(prop->key()->IsLiteral());
 
   __ mov(StoreDescriptor::NameRegister(), prop->key()->AsLiteral()->value());
   PopOperand(StoreDescriptor::ReceiverRegister());
   EmitLoadStoreICSlot(expr->AssignmentSlot());
   CallStoreIC();
-  PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+  PrepareForBailoutForId(expr->AssignmentId(), BailoutState::TOS_REGISTER);
   context()->Plug(eax);
 }
 
 
 void FullCodeGenerator::EmitNamedSuperPropertyStore(Property* prop) {
   // Assignment to named property of super.
   // eax : value
   // stack : receiver ('this'), home_object
   DCHECK(prop != NULL);
   Literal* key = prop->key()->AsLiteral();
@@ skipping 25 matching lines @@
   // esp[0]            : key
   // esp[kPointerSize] : receiver
 
   PopOperand(StoreDescriptor::NameRegister());  // Key.
   PopOperand(StoreDescriptor::ReceiverRegister());
   DCHECK(StoreDescriptor::ValueRegister().is(eax));
   Handle<Code> ic =
       CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
   EmitLoadStoreICSlot(expr->AssignmentSlot());
   CallIC(ic);
-  PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+  PrepareForBailoutForId(expr->AssignmentId(), BailoutState::TOS_REGISTER);
   context()->Plug(eax);
 }
 
 
 void FullCodeGenerator::CallIC(Handle<Code> code,
                                TypeFeedbackId ast_id) {
   ic_total_count_++;
   __ call(code, RelocInfo::CODE_TARGET, ast_id);
 }
 
 
 // Code common for calls using the IC.
 void FullCodeGenerator::EmitCallWithLoadIC(Call* expr) {
   Expression* callee = expr->expression();
 
   // Get the target function.
   ConvertReceiverMode convert_mode;
   if (callee->IsVariableProxy()) {
     { StackValueContext context(this);
       EmitVariableLoad(callee->AsVariableProxy());
-      PrepareForBailout(callee, NO_REGISTERS);
+      PrepareForBailout(callee, BailoutState::NO_REGISTERS);
     }
     // Push undefined as receiver. This is patched in the method prologue if it
     // is a sloppy mode method.
     PushOperand(isolate()->factory()->undefined_value());
     convert_mode = ConvertReceiverMode::kNullOrUndefined;
   } else {
     // Load the function from the receiver.
     DCHECK(callee->IsProperty());
     DCHECK(!callee->AsProperty()->IsSuperAccess());
     __ mov(LoadDescriptor::ReceiverRegister(), Operand(esp, 0));
     EmitNamedPropertyLoad(callee->AsProperty());
-    PrepareForBailoutForId(callee->AsProperty()->LoadId(), TOS_REG);
+    PrepareForBailoutForId(callee->AsProperty()->LoadId(),
+                           BailoutState::TOS_REGISTER);
     // Push the target function under the receiver.
     PushOperand(Operand(esp, 0));
     __ mov(Operand(esp, kPointerSize), eax);
     convert_mode = ConvertReceiverMode::kNotNullOrUndefined;
   }
 
   EmitCall(expr, convert_mode);
 }
 
 
@@ skipping 14 matching lines @@
   PushOperand(eax);
   PushOperand(Operand(esp, kPointerSize * 2));
   PushOperand(key->value());
   // Stack here:
   //  - home_object
   //  - this (receiver)
   //  - this (receiver) <-- LoadFromSuper will pop here and below.
   //  - home_object
   //  - key
   CallRuntimeWithOperands(Runtime::kLoadFromSuper);
-  PrepareForBailoutForId(prop->LoadId(), TOS_REG);
+  PrepareForBailoutForId(prop->LoadId(), BailoutState::TOS_REGISTER);
 
   // Replace home_object with target function.
   __ mov(Operand(esp, kPointerSize), eax);
 
   // Stack here:
   // - target function
   // - this (receiver)
   EmitCall(expr);
 }
 
 
 // Code common for calls using the IC.
 void FullCodeGenerator::EmitKeyedCallWithLoadIC(Call* expr,
                                                 Expression* key) {
   // Load the key.
   VisitForAccumulatorValue(key);
 
   Expression* callee = expr->expression();
 
   // Load the function from the receiver.
   DCHECK(callee->IsProperty());
   __ mov(LoadDescriptor::ReceiverRegister(), Operand(esp, 0));
   __ mov(LoadDescriptor::NameRegister(), eax);
   EmitKeyedPropertyLoad(callee->AsProperty());
-  PrepareForBailoutForId(callee->AsProperty()->LoadId(), TOS_REG);
+  PrepareForBailoutForId(callee->AsProperty()->LoadId(),
+                         BailoutState::TOS_REGISTER);
 
   // Push the target function under the receiver.
   PushOperand(Operand(esp, 0));
   __ mov(Operand(esp, kPointerSize), eax);
 
   EmitCall(expr, ConvertReceiverMode::kNotNullOrUndefined);
 }
 
 
 void FullCodeGenerator::EmitKeyedSuperCallWithLoadIC(Call* expr) {
@@ skipping 11 matching lines @@
   PushOperand(eax);
   PushOperand(Operand(esp, kPointerSize * 2));
   VisitForStackValue(prop->key());
   // Stack here:
   //  - home_object
   //  - this (receiver)
   //  - this (receiver) <-- LoadKeyedFromSuper will pop here and below.
   //  - home_object
   //  - key
   CallRuntimeWithOperands(Runtime::kLoadKeyedFromSuper);
-  PrepareForBailoutForId(prop->LoadId(), TOS_REG);
+  PrepareForBailoutForId(prop->LoadId(), BailoutState::TOS_REGISTER);
 
   // Replace home_object with target function.
   __ mov(Operand(esp, kPointerSize), eax);
 
   // Stack here:
   // - target function
   // - this (receiver)
   EmitCall(expr);
 }
 
 
 void FullCodeGenerator::EmitCall(Call* expr, ConvertReceiverMode mode) {
   // Load the arguments.
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
   for (int i = 0; i < arg_count; i++) {
     VisitForStackValue(args->at(i));
   }
 
-  PrepareForBailoutForId(expr->CallId(), NO_REGISTERS);
+  PrepareForBailoutForId(expr->CallId(), BailoutState::NO_REGISTERS);
   SetCallPosition(expr, expr->tail_call_mode());
   if (expr->tail_call_mode() == TailCallMode::kAllow) {
     if (FLAG_trace) {
       __ CallRuntime(Runtime::kTraceTailCall);
     }
     // Update profiling counters before the tail call since we will
     // not return to this function.
     EmitProfilingCounterHandlingForReturnSequence(true);
   }
   Handle<Code> ic =
@@ skipping 47 matching lines @@
     // eval-introduced variables.
     EmitDynamicLookupFastCase(callee, NOT_INSIDE_TYPEOF, &slow, &done);
 
     __ bind(&slow);
     // Call the runtime to find the function to call (returned in eax) and
     // the object holding it (returned in edx).
     __ Push(callee->name());
     __ CallRuntime(Runtime::kLoadLookupSlotForCall);
     PushOperand(eax);  // Function.
     PushOperand(edx);  // Receiver.
-    PrepareForBailoutForId(expr->LookupId(), NO_REGISTERS);
+    PrepareForBailoutForId(expr->LookupId(), BailoutState::NO_REGISTERS);
 
     // If fast case code has been generated, emit code to push the function
     // and receiver and have the slow path jump around this code.
     if (done.is_linked()) {
       Label call;
       __ jmp(&call, Label::kNear);
       __ bind(&done);
       // Push function.
       __ push(eax);
       // The receiver is implicitly the global receiver. Indicate this by
@@ skipping 24 matching lines @@
   }
 
   // Push a copy of the function (found below the arguments) and
   // resolve eval.
   __ push(Operand(esp, (arg_count + 1) * kPointerSize));
   EmitResolvePossiblyDirectEval(expr);
 
   // Touch up the stack with the resolved function.
   __ mov(Operand(esp, (arg_count + 1) * kPointerSize), eax);
 
-  PrepareForBailoutForId(expr->EvalId(), NO_REGISTERS);
+  PrepareForBailoutForId(expr->EvalId(), BailoutState::NO_REGISTERS);
 
   SetCallPosition(expr);
   __ mov(edi, Operand(esp, (arg_count + 1) * kPointerSize));
   __ Set(eax, arg_count);
   __ Call(isolate()->builtins()->Call(ConvertReceiverMode::kAny,
                                       expr->tail_call_mode()),
           RelocInfo::CODE_TARGET);
   OperandStackDepthDecrement(arg_count + 1);
   RecordJSReturnSite(expr);
   RestoreContext();
@@ skipping 28 matching lines @@
   __ Move(eax, Immediate(arg_count));
   __ mov(edi, Operand(esp, arg_count * kPointerSize));
 
   // Record call targets in unoptimized code.
   __ EmitLoadTypeFeedbackVector(ebx);
   __ mov(edx, Immediate(SmiFromSlot(expr->CallNewFeedbackSlot())));
 
   CallConstructStub stub(isolate());
   __ call(stub.GetCode(), RelocInfo::CODE_TARGET);
   OperandStackDepthDecrement(arg_count + 1);
-  PrepareForBailoutForId(expr->ReturnId(), TOS_REG);
+  PrepareForBailoutForId(expr->ReturnId(), BailoutState::TOS_REGISTER);
   RestoreContext();
   context()->Plug(eax);
 }
 
 
 void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
   SuperCallReference* super_call_ref =
       expr->expression()->AsSuperCallReference();
   DCHECK_NOT_NULL(super_call_ref);
 
@@ skipping 415 matching lines @@
 }
 
 
 void FullCodeGenerator::EmitCall(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK_LE(2, args->length());
   // Push target, receiver and arguments onto the stack.
   for (Expression* const arg : *args) {
     VisitForStackValue(arg);
   }
-  PrepareForBailoutForId(expr->CallId(), NO_REGISTERS);
+  PrepareForBailoutForId(expr->CallId(), BailoutState::NO_REGISTERS);
   // Move target to edi.
   int const argc = args->length() - 2;
   __ mov(edi, Operand(esp, (argc + 1) * kPointerSize));
   // Call the target.
   __ mov(eax, Immediate(argc));
   __ Call(isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
   OperandStackDepthDecrement(argc + 1);
   RestoreContext();
   // Discard the function left on TOS.
   context()->DropAndPlug(1, eax);
@@ skipping 186 matching lines @@
         // because we need to prepare a pair of extra administrative AST ids
         // for the optimizing compiler.
         DCHECK(context()->IsAccumulatorValue() || context()->IsStackValue());
         Label materialize_true, materialize_false, done;
         VisitForControl(expr->expression(),
                         &materialize_false,
                         &materialize_true,
                         &materialize_true);
         if (!context()->IsAccumulatorValue()) OperandStackDepthIncrement(1);
         __ bind(&materialize_true);
-        PrepareForBailoutForId(expr->MaterializeTrueId(), NO_REGISTERS);
+        PrepareForBailoutForId(expr->MaterializeTrueId(),
+                               BailoutState::NO_REGISTERS);
         if (context()->IsAccumulatorValue()) {
           __ mov(eax, isolate()->factory()->true_value());
         } else {
           __ Push(isolate()->factory()->true_value());
         }
         __ jmp(&done, Label::kNear);
         __ bind(&materialize_false);
-        PrepareForBailoutForId(expr->MaterializeFalseId(), NO_REGISTERS);
+        PrepareForBailoutForId(expr->MaterializeFalseId(),
+                               BailoutState::NO_REGISTERS);
         if (context()->IsAccumulatorValue()) {
           __ mov(eax, isolate()->factory()->false_value());
         } else {
           __ Push(isolate()->factory()->false_value());
         }
         __ bind(&done);
       }
       break;
     }
 
@@ skipping 78 matching lines @@
       }
 
       case VARIABLE:
         UNREACHABLE();
     }
   }
 
   // We need a second deoptimization point after loading the value
   // in case evaluating the property load my have a side effect.
   if (assign_type == VARIABLE) {
-    PrepareForBailout(expr->expression(), TOS_REG);
+    PrepareForBailout(expr->expression(), BailoutState::TOS_REGISTER);
   } else {
-    PrepareForBailoutForId(prop->LoadId(), TOS_REG);
+    PrepareForBailoutForId(prop->LoadId(), BailoutState::TOS_REGISTER);
   }
 
   // Inline smi case if we are in a loop.
   Label done, stub_call;
   JumpPatchSite patch_site(masm_);
   if (ShouldInlineSmiCase(expr->op())) {
     Label slow;
     patch_site.EmitJumpIfNotSmi(eax, &slow, Label::kNear);
 
     // Save result for postfix expressions.
@@ skipping 34 matching lines @@
     } else {
       __ add(eax, Immediate(Smi::FromInt(1)));
     }
     __ jmp(&stub_call, Label::kNear);
     __ bind(&slow);
   }
 
   // Convert old value into a number.
   ToNumberStub convert_stub(isolate());
   __ CallStub(&convert_stub);
-  PrepareForBailoutForId(expr->ToNumberId(), TOS_REG);
+  PrepareForBailoutForId(expr->ToNumberId(), BailoutState::TOS_REGISTER);
 
   // Save result for postfix expressions.
   if (expr->is_postfix()) {
     if (!context()->IsEffect()) {
       // Save the result on the stack. If we have a named or keyed property
       // we store the result under the receiver that is currently on top
       // of the stack.
       switch (assign_type) {
         case VARIABLE:
           PushOperand(eax);
@@ skipping 27 matching lines @@
   __ bind(&done);
 
   // Store the value returned in eax.
   switch (assign_type) {
     case VARIABLE:
       if (expr->is_postfix()) {
         // Perform the assignment as if via '='.
         { EffectContext context(this);
           EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                  Token::ASSIGN, expr->CountSlot());
-          PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+          PrepareForBailoutForId(expr->AssignmentId(),
+                                 BailoutState::TOS_REGISTER);
           context.Plug(eax);
         }
         // For all contexts except EffectContext We have the result on
         // top of the stack.
         if (!context()->IsEffect()) {
           context()->PlugTOS();
         }
       } else {
         // Perform the assignment as if via '='.
         EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                Token::ASSIGN, expr->CountSlot());
-        PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+        PrepareForBailoutForId(expr->AssignmentId(),
+                               BailoutState::TOS_REGISTER);
         context()->Plug(eax);
       }
       break;
     case NAMED_PROPERTY: {
       __ mov(StoreDescriptor::NameRegister(),
              prop->key()->AsLiteral()->value());
       PopOperand(StoreDescriptor::ReceiverRegister());
       EmitLoadStoreICSlot(expr->CountSlot());
       CallStoreIC();
-      PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+      PrepareForBailoutForId(expr->AssignmentId(), BailoutState::TOS_REGISTER);
       if (expr->is_postfix()) {
         if (!context()->IsEffect()) {
           context()->PlugTOS();
         }
       } else {
         context()->Plug(eax);
       }
       break;
     }
     case NAMED_SUPER_PROPERTY: {
@@ skipping 18 matching lines @@
       }
       break;
     }
     case KEYED_PROPERTY: {
       PopOperand(StoreDescriptor::NameRegister());
       PopOperand(StoreDescriptor::ReceiverRegister());
       Handle<Code> ic =
           CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
       EmitLoadStoreICSlot(expr->CountSlot());
       CallIC(ic);
-      PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+      PrepareForBailoutForId(expr->AssignmentId(), BailoutState::TOS_REGISTER);
       if (expr->is_postfix()) {
         // Result is on the stack
         if (!context()->IsEffect()) {
           context()->PlugTOS();
         }
       } else {
         context()->Plug(eax);
       }
       break;
     }
@@ skipping 361 matching lines @@
       isolate->builtins()->OnStackReplacement()->entry(),
       Assembler::target_address_at(call_target_address, unoptimized_code));
   return ON_STACK_REPLACEMENT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87