Begins work on ARM64, first assembler test.

runtime/vm/instructions_arm64.h

+// Copyright (c) 2014, 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.
+// Classes that describe assembly patterns as used by inline caches.
+
+#ifndef VM_INSTRUCTIONS_ARM64_H_
+#define VM_INSTRUCTIONS_ARM64_H_
+
+#ifndef VM_INSTRUCTIONS_H_
+#error Do not include instructions_arm64.h directly; use instructions.h instead.
+#endif
+
+#include "vm/constants_arm64.h"
+#include "vm/object.h"
+
+namespace dart {
+
+class InstructionPattern : public AllStatic {
+ public:
+  // Decodes a load sequence ending at 'end' (the last instruction of the
+  // load sequence is the instruction before the one at end).  Returns the
+  // address of the first instruction in the sequence.  Returns the register
+  // being loaded and the loaded object in the output parameters 'reg' and
+  // 'obj' respectively.
+  static uword DecodeLoadObject(uword end,
+                                const Array& object_pool,
+                                Register* reg,
+                                Object* obj);
+
+  // Decodes a load sequence ending at 'end' (the last instruction of the
+  // load sequence is the instruction before the one at end).  Returns the
+  // address of the first instruction in the sequence.  Returns the register
+  // being loaded and the loaded immediate value in the output parameters
+  // 'reg' and 'value' respectively.
+  static uword DecodeLoadWordImmediate(uword end,
+                                       Register* reg,
+                                       intptr_t* value);
+
+  // Decodes a load sequence ending at 'end' (the last instruction of the
+  // load sequence is the instruction before the one at end).  Returns the
+  // address of the first instruction in the sequence.  Returns the register
+  // being loaded and the index in the pool being read from in the output
+  // parameters 'reg' and 'index' respectively.
+  static uword DecodeLoadWordFromPool(uword end,
+                                      Register* reg,
+                                      intptr_t* index);
+};
+
+
+class CallPattern : public ValueObject {
+ public:
+  CallPattern(uword pc, const Code& code);
+
+  RawICData* IcData();
+  RawArray* ClosureArgumentsDescriptor();
+
+  uword TargetAddress() const;
+  void SetTargetAddress(uword target_address) const;
+
+  // This constant length is only valid for inserted call patterns used for
+  // lazy deoptimization. Regular call pattern may vary in length.
+  static int LengthInBytes();
+
+  static void InsertAt(uword pc, uword target_address);
+
+ private:
+  const Array& object_pool_;
+
+  uword end_;
+  uword args_desc_load_end_;
+  uword ic_data_load_end_;
+
+  intptr_t target_address_pool_index_;
+  Array& args_desc_;
+  ICData& ic_data_;
+
+  DISALLOW_COPY_AND_ASSIGN(CallPattern);
+};
+
+
+class JumpPattern : public ValueObject {
+ public:
+  JumpPattern(uword pc, const Code& code);
+
+  static const int kLengthInBytes = 3 * Instr::kInstrSize;
+
+  static int pattern_length_in_bytes();
+
+  bool IsValid() const;
+  uword TargetAddress() const;
+  void SetTargetAddress(uword target_address) const;
+
+ private:
+  const uword pc_;
+
+  DISALLOW_COPY_AND_ASSIGN(JumpPattern);
+};
+
+}  // namespace dart
+
+#endif  // VM_INSTRUCTIONS_ARM64_H_