Implement basic support for deferred slow path code with calls that save and restore live registers.

runtime/vm/flow_graph_compiler_ia32.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_FLOW_GRAPH_COMPILER_IA32_H_
 #define VM_FLOW_GRAPH_COMPILER_IA32_H_
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #error Include flow_graph_compiler.h instead of flow_graph_compiler_ia32.h.
 #endif
@@ skipping 173 matching lines @@
                             intptr_t deopt_id,
                             intptr_t token_pos,
                             intptr_t try_index);
   Label* AddDeoptStub(intptr_t deopt_id,
                       intptr_t try_index_,
                       DeoptReasonId reason,
                       Register reg1 = kNoRegister,
                       Register reg2 = kNoRegister,
                       Register reg3 = kNoRegister);
 
+  void AddSlowPathCode(SlowPathCode* slow_path);
+
   void FinalizeExceptionHandlers(const Code& code);
   void FinalizePcDescriptors(const Code& code);
   void FinalizeDeoptInfo(const Code& code);
   void FinalizeStackmaps(const Code& code);
   void FinalizeVarDescriptors(const Code& code);
   void FinalizeComments(const Code& code);
 
   const Bool& bool_true() const { return bool_true_; }
   const Bool& bool_false() const { return bool_false_; }
   const Class& double_class() const { return double_class_; }
 
   FrameRegisterAllocator* frame_register_allocator() {
     return &frame_register_allocator_;
   }
 
+  void SaveLiveRegisters(LocationSummary* locs);
+  void RestoreLiveRegisters(LocationSummary* locs);
+
   // Returns true if the compiled function has a finally clause.
   bool HasFinally() const;
 
   static const int kLocalsOffsetFromFP = (-1 * kWordSize);
 
  private:
   friend class DeoptimizationStub;
 
   void GenerateDeferredCode();
 
@@ skipping 79 matching lines @@
 
   // Compiler specific per-block state.  Indexed by postorder block number
   // for convenience.  This is not the block's index in the block order,
   // which is reverse postorder.
   BlockEntryInstr* current_block_;
   ExceptionHandlerList* exception_handlers_list_;
   DescriptorList* pc_descriptors_list_;
   StackmapTableBuilder* stackmap_table_builder_;
   GrowableArray<BlockInfo*> block_info_;
   GrowableArray<DeoptimizationStub*> deopt_stubs_;
+  GrowableArray<SlowPathCode*> slow_path_code_;
   const GrowableObjectArray& object_table_;
   const bool is_optimizing_;
   const bool is_ssa_;
   const bool is_dart_leaf_;
 
   const Bool& bool_true_;
   const Bool& bool_false_;
   const Class& double_class_;
 
   FrameRegisterAllocator frame_register_allocator_;
   ParallelMoveResolver parallel_move_resolver_;
 
   // Currently instructions generate deopt stubs internally by
   // calling AddDeoptStub.  To communicate deoptimization environment
   // that should be used when deoptimizing we store it in this variable.
   // In future AddDeoptStub should be moved out of the instruction template.
   Environment* pending_deoptimization_env_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_IA32_H_