[turbofan]: Implement tail calls with more callee than caller parameters

src/compiler/code-generator.h

 // Copyright 2014 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_CODE_GENERATOR_H_
 #define V8_COMPILER_CODE_GENERATOR_H_
 
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/instruction.h"
 #include "src/deoptimizer.h"
@@ skipping 78 matching lines @@
   // Generates an architecture-specific, descriptor-specific prologue
   // to set up a stack frame.
   void AssemblePrologue();
   // Generates an architecture-specific, descriptor-specific return sequence
   // to tear down a stack frame.
   void AssembleReturn();
 
   // Generates code to deconstruct a the caller's frame, including arguments.
   void AssembleDeconstructActivationRecord(int stack_param_delta);
 
+  // Generates code to manipulate the stack in preparation for a tail call.
+  void AssemblePrepareTailCall(int stack_param_delta);
+
   // ===========================================================================
   // ============== Architecture-specific gap resolver methods. ================
   // ===========================================================================
 
   // Interface used by the gap resolver to emit moves and swaps.
   void AssembleMove(InstructionOperand* source,
                     InstructionOperand* destination) final;
   void AssembleSwap(InstructionOperand* source,
                     InstructionOperand* destination) final;
 
@@ skipping 24 matching lines @@
   void BuildTranslationForFrameStateDescriptor(
       FrameStateDescriptor* descriptor, Instruction* instr,
       Translation* translation, size_t frame_state_offset,
       OutputFrameStateCombine state_combine);
   void AddTranslationForOperand(Translation* translation, Instruction* instr,
                                 InstructionOperand* op, MachineType type);
   void AddNopForSmiCodeInlining();
   void EnsureSpaceForLazyDeopt();
   void MarkLazyDeoptSite();
 
+  // Converts the delta in the number of stack parameter passed from a tail
+  // caller to the callee into the distance (in pointers) the SP must be
+  // adjusted, taking frame elision and other relevant factors into
+  // consideration.
+  int TailCallFrameStackSlotDelta(int stack_param_delta);
+
   // ===========================================================================
 
   struct DeoptimizationState : ZoneObject {
    public:
     BailoutId bailout_id() const { return bailout_id_; }
     int translation_id() const { return translation_id_; }
     int pc_offset() const { return pc_offset_; }
 
     DeoptimizationState(BailoutId bailout_id, int translation_id, int pc_offset)
         : bailout_id_(bailout_id),
@@ skipping 35 matching lines @@
   OutOfLineCode* ools_;
   int osr_pc_offset_;
   bool needs_frame_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_GENERATOR_H