Add mips skeleton sources.

runtime/vm/assembler_mips.h

Index: runtime/vm/assembler_mips.h
===================================================================
--- runtime/vm/assembler_mips.h	(revision 0)
+++ runtime/vm/assembler_mips.h	(revision 0)
@@ -0,0 +1,183 @@
+// Copyright (c) 2013, 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.
+
+#ifndef VM_ASSEMBLER_MIPS_H_
+#define VM_ASSEMBLER_MIPS_H_
+
+#ifndef VM_ASSEMBLER_H_
+#error Do not include assembler_mips.h directly; use assembler.h instead.
+#endif
+
+#include "platform/assert.h"
+#include "vm/constants_mips.h"
+
+namespace dart {
+
+class Operand : public ValueObject {
+ public:
+  Operand(const Operand& other) : ValueObject() {
+    UNIMPLEMENTED();
+  }
+
+  Operand& operator=(const Operand& other) {
+    UNIMPLEMENTED();
+    return *this;
+  }
+
+ protected:
+  Operand() { }  // Needed by subclass Address.
+};
+
+
+class Address : public Operand {
+ public:
+  Address(Register base, int32_t disp) {
+    UNIMPLEMENTED();
+  }
+
+  Address(const Address& other) : Operand(other) { }
+
+  Address& operator=(const Address& other) {
+    Operand::operator=(other);
+    return *this;
+  }
+};
+
+
+class FieldAddress : public Address {
+ public:
+  FieldAddress(Register base, int32_t disp)
+      : Address(base, disp - kHeapObjectTag) { }
+
+  FieldAddress(const FieldAddress& other) : Address(other) { }
+
+  FieldAddress& operator=(const FieldAddress& other) {
+    Address::operator=(other);
+    return *this;
+  }
+};
+
+
+class Label : public ValueObject {
+ public:
+  Label() : position_(0) { }
+
+  ~Label() {
+    // Assert if label is being destroyed with unresolved branches pending.
+    ASSERT(!IsLinked());
+  }
+
+  // Returns the position for bound and linked labels. Cannot be used
+  // for unused labels.
+  int Position() const {
+    ASSERT(!IsUnused());
+    return IsBound() ? -position_ - kWordSize : position_ - kWordSize;
+  }
+
+  bool IsBound() const { return position_ < 0; }
+  bool IsUnused() const { return position_ == 0; }
+  bool IsLinked() const { return position_ > 0; }
+
+ private:
+  int position_;
+
+  void Reinitialize() {
+    position_ = 0;
+  }
+
+  void BindTo(int position) {
+    ASSERT(!IsBound());
+    position_ = -position - kWordSize;
+    ASSERT(IsBound());
+  }
+
+  void LinkTo(int position) {
+    ASSERT(!IsBound());
+    position_ = position + kWordSize;
+    ASSERT(IsLinked());
+  }
+
+  friend class Assembler;
+  DISALLOW_COPY_AND_ASSIGN(Label);
+};
+
+
+class CPUFeatures : public AllStatic {
+ public:
+  static void InitOnce() { }
+  static bool double_truncate_round_supported() {
+    UNIMPLEMENTED();
+    return false;
+  }
+};
+
+
+class Assembler : public ValueObject {
+ public:
+  Assembler() { UNIMPLEMENTED(); }
+  ~Assembler() { }
+
+  void PopRegister(Register r) {
+    UNIMPLEMENTED();
+  }
+
+  void Bind(Label* label) {
+    UNIMPLEMENTED();
+  }
+
+  // Misc. functionality
+  int CodeSize() const {
+    UNIMPLEMENTED();
+    return 0;
+  }
+  int prologue_offset() const {
+    UNIMPLEMENTED();
+    return 0;
+  }
+  const ZoneGrowableArray<int>& GetPointerOffsets() const {
+    UNIMPLEMENTED();
+    return *pointer_offsets_;
+  }
+  void FinalizeInstructions(const MemoryRegion& region) {
+    UNIMPLEMENTED();
+  }
+
+  // Debugging and bringup support.
+  void Stop(const char* message) { UNIMPLEMENTED(); }
+  void Unimplemented(const char* message);
+  void Untested(const char* message);
+  void Unreachable(const char* message);
+
+  static void InitializeMemoryWithBreakpoints(uword data, int length) {
+    UNIMPLEMENTED();
+  }
+
+  void Comment(const char* format, ...) PRINTF_ATTRIBUTE(2, 3) {
+    UNIMPLEMENTED();
+  }
+
+  const Code::Comments& GetCodeComments() const {
+    UNIMPLEMENTED();
+    return Code::Comments::New(0);
+  }
+
+  static const char* RegisterName(Register reg) {
+    UNIMPLEMENTED();
+    return NULL;
+  }
+
+  static const char* FpuRegisterName(FpuRegister reg) {
+    UNIMPLEMENTED();
+    return NULL;
+  }
+
+ private:
+  ZoneGrowableArray<int>* pointer_offsets_;
+  DISALLOW_ALLOCATION();
+  DISALLOW_COPY_AND_ASSIGN(Assembler);
+};
+
+}  // namespace dart
+
+#endif  // VM_ASSEMBLER_MIPS_H_