[crankshaft] Support inlining of function calls in tail position (in ES6 sense).

src/crankshaft/hydrogen-instructions.h

 // 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.
 
 #ifndef V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
 #define V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
 
 #include <cstring>
 #include <iosfwd>
 
@@ skipping 1930 matching lines @@
 class HConstant;
 
 
 class HEnterInlined final : public HTemplateInstruction<0> {
  public:
   static HEnterInlined* New(Isolate* isolate, Zone* zone, HValue* context,
                             BailoutId return_id, Handle<JSFunction> closure,
                             HConstant* closure_context, int arguments_count,
                             FunctionLiteral* function,
                             InliningKind inlining_kind, Variable* arguments_var,
-                            HArgumentsObject* arguments_object) {
-    return new (zone) HEnterInlined(return_id, closure, closure_context,
-                                    arguments_count, function, inlining_kind,
-                                    arguments_var, arguments_object, zone);
+                            HArgumentsObject* arguments_object,
+                            TailCallMode syntactic_tail_call_mode) {
+    return new (zone)
+        HEnterInlined(return_id, closure, closure_context, arguments_count,
+                      function, inlining_kind, arguments_var, arguments_object,
+                      syntactic_tail_call_mode, zone);
   }
 
   void RegisterReturnTarget(HBasicBlock* return_target, Zone* zone);
   ZoneList<HBasicBlock*>* return_targets() { return &return_targets_; }
 
   std::ostream& PrintDataTo(std::ostream& os) const override;  // NOLINT
 
   Handle<SharedFunctionInfo> shared() const { return shared_; }
   Handle<JSFunction> closure() const { return closure_; }
   HConstant* closure_context() const { return closure_context_; }
   int arguments_count() const { return arguments_count_; }
   bool arguments_pushed() const { return arguments_pushed_; }
   void set_arguments_pushed() { arguments_pushed_ = true; }
   FunctionLiteral* function() const { return function_; }
   InliningKind inlining_kind() const { return inlining_kind_; }
+  TailCallMode syntactic_tail_call_mode() const {
+    return syntactic_tail_call_mode_;
+  }
   BailoutId ReturnId() const { return return_id_; }
   int inlining_id() const { return inlining_id_; }
   void set_inlining_id(int inlining_id) { inlining_id_ = inlining_id; }
 
   Representation RequiredInputRepresentation(int index) override {
     return Representation::None();
   }
 
   Variable* arguments_var() { return arguments_var_; }
   HArgumentsObject* arguments_object() { return arguments_object_; }
 
   DECLARE_CONCRETE_INSTRUCTION(EnterInlined)
 
  private:
   HEnterInlined(BailoutId return_id, Handle<JSFunction> closure,
                 HConstant* closure_context, int arguments_count,
                 FunctionLiteral* function, InliningKind inlining_kind,
                 Variable* arguments_var, HArgumentsObject* arguments_object,
-                Zone* zone)
+                TailCallMode syntactic_tail_call_mode, Zone* zone)
       : return_id_(return_id),
         shared_(handle(closure->shared())),
         closure_(closure),
         closure_context_(closure_context),
         arguments_count_(arguments_count),
         arguments_pushed_(false),
         function_(function),
         inlining_kind_(inlining_kind),
+        syntactic_tail_call_mode_(syntactic_tail_call_mode),
         inlining_id_(0),
         arguments_var_(arguments_var),
         arguments_object_(arguments_object),
         return_targets_(2, zone) {}
 
   BailoutId return_id_;
   Handle<SharedFunctionInfo> shared_;
   Handle<JSFunction> closure_;
   HConstant* closure_context_;
   int arguments_count_;
   bool arguments_pushed_;
   FunctionLiteral* function_;
   InliningKind inlining_kind_;
+  TailCallMode syntactic_tail_call_mode_;
   int inlining_id_;
   Variable* arguments_var_;
   HArgumentsObject* arguments_object_;
   ZoneList<HBasicBlock*> return_targets_;
 };
 
 
 class HLeaveInlined final : public HTemplateInstruction<0> {
  public:
   HLeaveInlined(HEnterInlined* entry,
@@ skipping 5571 matching lines @@
 
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_