[turbofan] Implement tail calls with differing stack parameter counts

src/compiler/js-operator.h

 // Copyright 2013 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_COMPILER_JS_OPERATOR_H_
 #define V8_COMPILER_JS_OPERATOR_H_
 
 #include "src/runtime/runtime.h"
 #include "src/unique.h"
 
@@ skipping 70 matching lines @@
   friend size_t hash_value(CallFunctionParameters const& p) {
     return base::hash_combine(p.bit_field_, p.feedback_);
   }
 
   typedef BitField<size_t, 0, 28> ArityField;
   typedef BitField<CallFunctionFlags, 28, 2> FlagsField;
   typedef BitField<LanguageMode, 30, 2> LanguageModeField;
 
   const uint32_t bit_field_;
   const VectorSlotPair feedback_;
-  bool tail_call_mode_;
+  TailCallMode tail_call_mode_;
 };
 
 size_t hash_value(CallFunctionParameters const&);
 
 std::ostream& operator<<(std::ostream&, CallFunctionParameters const&);
 
 const CallFunctionParameters& CallFunctionParametersOf(const Operator* op);
 
 
 // Defines the arity and the ID for a runtime function call. This is used as a
 // parameter by JSCallRuntime operators.
 class CallRuntimeParameters final {
  public:
-  CallRuntimeParameters(Runtime::FunctionId id, size_t arity)
-      : id_(id), arity_(arity) {}
+  CallRuntimeParameters(Runtime::FunctionId id, size_t arity, TailCallMode mode)
+      : id_(id), arity_(arity), mode_(mode) {}
 
   Runtime::FunctionId id() const { return id_; }
   size_t arity() const { return arity_; }
+  TailCallMode mode() const { return mode_; }
 
  private:
   const Runtime::FunctionId id_;
   const size_t arity_;
+  const TailCallMode mode_;
 };
 
 bool operator==(CallRuntimeParameters const&, CallRuntimeParameters const&);
 bool operator!=(CallRuntimeParameters const&, CallRuntimeParameters const&);
 
 size_t hash_value(CallRuntimeParameters const&);
 
 std::ostream& operator<<(std::ostream&, CallRuntimeParameters const&);
 
 const CallRuntimeParameters& CallRuntimeParametersOf(const Operator* op);
@@ skipping 351 matching lines @@
   const Operator* Create();
   const Operator* CreateClosure(Handle<SharedFunctionInfo> shared_info,
                                 PretenureFlag pretenure);
   const Operator* CreateLiteralArray(int literal_flags);
   const Operator* CreateLiteralObject(int literal_flags);
 
   const Operator* CallFunction(
       size_t arity, CallFunctionFlags flags, LanguageMode language_mode,
       VectorSlotPair const& feedback = VectorSlotPair(),
       TailCallMode tail_call_mode = NO_TAIL_CALLS);
-  const Operator* CallRuntime(Runtime::FunctionId id, size_t arity);
+  const Operator* CallRuntime(Runtime::FunctionId id, size_t arity,
+                              TailCallMode mode = ALLOW_TAIL_CALLS);
 
   const Operator* CallConstruct(int arguments);
 
   const Operator* LoadProperty(const VectorSlotPair& feedback,
                                LanguageMode language_mode);
   const Operator* LoadNamed(const Unique<Name>& name,
                             const VectorSlotPair& feedback,
                             LanguageMode language_mode);
 
   const Operator* StoreProperty(LanguageMode language_mode,
@@ skipping 51 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(JSOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_OPERATOR_H_