Move Hydrogen and Lithium to src/crankshaft/

src/arm64/lithium-gap-resolver-arm64.h

-// Copyright 2013 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_ARM64_LITHIUM_GAP_RESOLVER_ARM64_H_
-#define V8_ARM64_LITHIUM_GAP_RESOLVER_ARM64_H_
-
-#include "src/arm64/delayed-masm-arm64.h"
-#include "src/lithium.h"
-
-namespace v8 {
-namespace internal {
-
-class LCodeGen;
-class LGapResolver;
-
-class DelayedGapMasm : public DelayedMasm {
- public:
-  DelayedGapMasm(LCodeGen* owner, MacroAssembler* masm)
-    : DelayedMasm(owner, masm, root) {
-    // We use the root register as an extra scratch register.
-    // The root register has two advantages:
-    //  - It is not in crankshaft allocatable registers list, so it can't
-    //    interfere with the allocatable registers.
-    //  - We don't need to push it on the stack, as we can reload it with its
-    //    value once we have finish.
-  }
-  void EndDelayedUse();
-};
-
-
-class LGapResolver BASE_EMBEDDED {
- public:
-  explicit LGapResolver(LCodeGen* owner);
-
-  // Resolve a set of parallel moves, emitting assembler instructions.
-  void Resolve(LParallelMove* parallel_move);
-
- private:
-  // Build the initial list of moves.
-  void BuildInitialMoveList(LParallelMove* parallel_move);
-
-  // Perform the move at the moves_ index in question (possibly requiring
-  // other moves to satisfy dependencies).
-  void PerformMove(int index);
-
-  // If a cycle is found in the series of moves, save the blocking value to
-  // a scratch register.  The cycle must be found by hitting the root of the
-  // depth-first search.
-  void BreakCycle(int index);
-
-  // After a cycle has been resolved, restore the value from the scratch
-  // register to its proper destination.
-  void RestoreValue();
-
-  // Emit a move and remove it from the move graph.
-  void EmitMove(int index);
-
-  // Emit a move from one stack slot to another.
-  void EmitStackSlotMove(int index) {
-    masm_.StackSlotMove(moves_[index].source(), moves_[index].destination());
-  }
-
-  // Verify the move list before performing moves.
-  void Verify();
-
-  // Registers used to solve cycles.
-  const Register& SavedValueRegister() {
-    DCHECK(!masm_.ScratchRegister().IsAllocatable());
-    return masm_.ScratchRegister();
-  }
-  // The scratch register is used to break cycles and to store constant.
-  // These two methods switch from one mode to the other.
-  void AcquireSavedValueRegister() { masm_.AcquireScratchRegister(); }
-  void ReleaseSavedValueRegister() { masm_.ReleaseScratchRegister(); }
-  const FPRegister& SavedFPValueRegister() {
-    // We use the Crankshaft floating-point scratch register to break a cycle
-    // involving double values as the MacroAssembler will not need it for the
-    // operations performed by the gap resolver.
-    DCHECK(!crankshaft_fp_scratch.IsAllocatable());
-    return crankshaft_fp_scratch;
-  }
-
-  LCodeGen* cgen_;
-  DelayedGapMasm masm_;
-
-  // List of moves not yet resolved.
-  ZoneList<LMoveOperands> moves_;
-
-  int root_index_;
-  bool in_cycle_;
-  LOperand* saved_destination_;
-};
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_ARM64_LITHIUM_GAP_RESOLVER_ARM64_H_