Save/restore only live registers in the generator suspend/resume.

src/interpreter/interpreter-assembler.h

 // Copyright 2015 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_INTERPRETER_INTERPRETER_ASSEMBLER_H_
 #define V8_INTERPRETER_INTERPRETER_ASSEMBLER_H_
 
 #include "src/allocation.h"
 #include "src/builtins/builtins.h"
 #include "src/code-stub-assembler.h"
@@ skipping 63 matching lines @@
 
   // Context at |depth| in the context chain starting at |context|.
   compiler::Node* GetContextAtDepth(compiler::Node* context,
                                     compiler::Node* depth);
 
   // Goto the given |target| if the context chain starting at |context| has any
   // extensions up to the given |depth|.
   void GotoIfHasContextExtensionUpToDepth(compiler::Node* context,
                                           compiler::Node* depth, Label* target);
 
-  // Number of registers.
-  compiler::Node* RegisterCount();
-
   // Backup/restore register file to/from a fixed array of the correct length.
-  compiler::Node* ExportRegisterFile(compiler::Node* array);
-  compiler::Node* ImportRegisterFile(compiler::Node* array);
+  compiler::Node* ExportRegisterFile(compiler::Node* array,
+                                     compiler::Node* register_count);
+  compiler::Node* ImportRegisterFile(compiler::Node* array,
+                                     compiler::Node* register_count);
 
   // Loads from and stores to the interpreter register file.
   compiler::Node* LoadRegister(Register reg);
   compiler::Node* LoadRegister(compiler::Node* reg_index);
   compiler::Node* LoadAndUntagRegister(Register reg);
   compiler::Node* StoreRegister(compiler::Node* value, Register reg);
   compiler::Node* StoreRegister(compiler::Node* value,
                                 compiler::Node* reg_index);
   compiler::Node* StoreAndTagRegister(compiler::Node* value, Register reg);
 
@@ skipping 114 matching lines @@
   // Truncate tagged |value| to word32 and store the type feedback in
   // |var_type_feedback|.
   compiler::Node* TruncateTaggedToWord32WithFeedback(
       compiler::Node* context, compiler::Node* value,
       Variable* var_type_feedback);
 
   // Abort with the given bailout reason.
   void Abort(BailoutReason bailout_reason);
   void AbortIfWordNotEqual(compiler::Node* lhs, compiler::Node* rhs,
                            BailoutReason bailout_reason);
+  // Abort if |register_count| is invalid for given register file array.
+  void AbortIfRegisterCountInvalid(compiler::Node* register_file,
+                                   compiler::Node* register_count);
 
   // Dispatch to frame dropper trampoline if necessary.
   void MaybeDropFrames(compiler::Node* context);
 
   // Returns the offset from the BytecodeArrayPointer of the current bytecode.
   compiler::Node* BytecodeOffset();
 
  protected:
   Bytecode bytecode() const { return bytecode_; }
   static bool TargetSupportsUnalignedAccess();
@@ skipping 125 matching lines @@
   compiler::Node* stack_pointer_before_call_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_INTERPRETER_ASSEMBLER_H_