[ignition/turbofan] Wrap bytecode liveness bitvectors

src/compiler/bytecode-analysis.h

 // Copyright 2016 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_BYTECODE_ANALYSIS_H_
 #define V8_COMPILER_BYTECODE_ANALYSIS_H_
 
 #include "src/base/hashmap.h"
 #include "src/bit-vector.h"
 #include "src/compiler/bytecode-liveness-map.h"
@@ skipping 18 matching lines @@
 
   // Return true if the given offset is a loop header
   bool IsLoopHeader(int offset) const;
   // Get the loop header offset of the containing loop for arbitrary
   // {offset}, or -1 if the {offset} is not inside any loop.
   int GetLoopOffsetFor(int offset) const;
   // Gets the loop header offset of the parent loop of the loop header
   // at {header_offset}, or -1 for outer-most loops.
   int GetParentLoopFor(int header_offset) const;
 
-  // Gets the in-liveness for the bytecode at {offset}. The liveness bit vector
-  // represents the liveness of the registers and the accumulator, with the last
-  // bit being the accumulator liveness bit, and so is (register count + 1) bits
-  // long.
-  const BitVector* GetInLivenessFor(int offset) const;
+  // Gets the in-liveness for the bytecode at {offset}.
+  const BytecodeLivenessState* GetInLivenessFor(int offset) const;
 
-  // Gets the out-liveness for the bytecode at {offset}. The liveness bit vector
-  // represents the liveness of the registers and the accumulator, with the last
-  // bit being the accumulator liveness bit, and so is (register count + 1) bits
-  // long.
-  const BitVector* GetOutLivenessFor(int offset) const;
+  // Gets the out-liveness for the bytecode at {offset}.
+  const BytecodeLivenessState* GetOutLivenessFor(int offset) const;
 
   std::ostream& PrintLivenessTo(std::ostream& os) const;
 
  private:
   void PushLoop(int loop_header, int loop_end);
 
 #if DEBUG
   bool LivenessIsValid();
 #endif
 
@@ skipping 14 matching lines @@
   BytecodeLivenessMap liveness_map_;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeAnalysis);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_BYTECODE_ANALYSIS_H_