[turbofan] Implement tail calls with differing stack parameter counts

src/compiler/instruction.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_INSTRUCTION_H_
 #define V8_COMPILER_INSTRUCTION_H_
 
 #include <deque>
 #include <iosfwd>
 #include <map>
@@ skipping 1014 matching lines @@
 // register allocation.
 // TODO(titzer): s/IsDouble/IsFloat64/
 class InstructionSequence final : public ZoneObject {
  public:
   static InstructionBlocks* InstructionBlocksFor(Zone* zone,
                                                  const Schedule* schedule);
   // Puts the deferred blocks last.
   static void ComputeAssemblyOrder(InstructionBlocks* blocks);
 
   InstructionSequence(Isolate* isolate, Zone* zone,
-                      InstructionBlocks* instruction_blocks);
+                      InstructionBlocks* instruction_blocks, Frame* frame);
 
   int NextVirtualRegister();
   int VirtualRegisterCount() const { return next_virtual_register_; }
 
   const InstructionBlocks& instruction_blocks() const {
     return *instruction_blocks_;
   }
 
   int InstructionBlockCount() const {
     return static_cast<int>(instruction_blocks_->size());
@@ skipping 120 matching lines @@
                          SourcePosition* result) const;
   void SetSourcePosition(const Instruction* instr, SourcePosition value);
 
   bool ContainsCall() const {
     for (Instruction* instr : instructions_) {
       if (instr->IsCall()) return true;
     }
     return false;
   }
 
+  Frame* frame() const { return frame_; }
+
  private:
   friend std::ostream& operator<<(std::ostream& os,
                                   const PrintableInstructionSequence& code);
 
   typedef ZoneMap<const Instruction*, SourcePosition> SourcePositionMap;
 
   Isolate* isolate_;
   Zone* const zone_;
   InstructionBlocks* const instruction_blocks_;
+  Frame* frame_;
   SourcePositionMap source_positions_;
   IntVector block_starts_;
   ConstantMap constants_;
   Immediates immediates_;
   InstructionDeque instructions_;
   int next_virtual_register_;
   ReferenceMapDeque reference_maps_;
   ZoneVector<MachineType> representations_;
   DeoptimizationVector deoptimization_entries_;
 
   DISALLOW_COPY_AND_ASSIGN(InstructionSequence);
 };
 
 
 struct PrintableInstructionSequence {
   const RegisterConfiguration* register_configuration_;
   const InstructionSequence* sequence_;
 };
 
 
+enum TailCallOpcode {
+  kPopAndStore,
+  kStore,
+  kReplaceReturn,
+  kDeconstructFrame,
+  kParametersReady
+};
+
+
 std::ostream& operator<<(std::ostream& os,
                          const PrintableInstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_