1 files changed, 83 insertions, 0 deletions
diff --git a/js/src/jit/x86-shared/MoveEmitter-x86-shared.h b/js/src/jit/x86-shared/MoveEmitter-x86-shared.h
new file mode 100644
index 0000000000..15a1680c9a
--- /dev/null
+++ b/js/src/jit/x86-shared/MoveEmitter-x86-shared.h
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_MoveEmitter_x86_shared_h
+#define jit_MoveEmitter_x86_shared_h
+
+#include "mozilla/Maybe.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "jit/MoveResolver.h"
+#include "jit/Registers.h"
+
+namespace js {
+namespace jit {
+
+struct Address;
+class MacroAssembler;
+class Operand;
+
+class MoveEmitterX86 {
+  bool inCycle_;
+  MacroAssembler& masm;
+
+  // Original stack push value.
+  uint32_t pushedAtStart_;
+
+  // This is a store stack offset for the cycle-break spill slot, snapshotting
+  // codegen->framePushed_ at the time it is allocated. -1 if not allocated.
+  int32_t pushedAtCycle_;
+
+#ifdef JS_CODEGEN_X86
+  // Optional scratch register for performing moves.
+  mozilla::Maybe<Register> scratchRegister_;
+#endif
+
+  void assertDone();
+  Address cycleSlot();
+  Address toAddress(const MoveOperand& operand) const;
+  Operand toOperand(const MoveOperand& operand) const;
+  Operand toPopOperand(const MoveOperand& operand) const;
+
+  size_t characterizeCycle(const MoveResolver& moves, size_t i,
+                           bool* allGeneralRegs, bool* allFloatRegs);
+  bool maybeEmitOptimizedCycle(const MoveResolver& moves, size_t i,
+                               bool allGeneralRegs, bool allFloatRegs,
+                               size_t swapCount);
+  void emitInt32Move(const MoveOperand& from, const MoveOperand& to,
+                     const MoveResolver& moves, size_t i);
+  void emitGeneralMove(const MoveOperand& from, const MoveOperand& to,
+                       const MoveResolver& moves, size_t i);
+  void emitFloat32Move(const MoveOperand& from, const MoveOperand& to);
+  void emitDoubleMove(const MoveOperand& from, const MoveOperand& to);
+  void emitSimd128Move(const MoveOperand& from, const MoveOperand& to);
+  void breakCycle(const MoveOperand& to, MoveOp::Type type);
+  void completeCycle(const MoveOperand& to, MoveOp::Type type);
+
+ public:
+  explicit MoveEmitterX86(MacroAssembler& masm);
+  ~MoveEmitterX86();
+  void emit(const MoveResolver& moves);
+  void finish();
+
+  void setScratchRegister(Register reg) {
+#ifdef JS_CODEGEN_X86
+    scratchRegister_.emplace(reg);
+#endif
+  }
+
+  mozilla::Maybe<Register> findScratchRegister(const MoveResolver& moves,
+                                               size_t i);
+};
+
+using MoveEmitter = MoveEmitterX86;
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_MoveEmitter_x86_shared_h */