Initial SIMDBC interpreter.

runtime/vm/simulator_dbc.h

Index: runtime/vm/simulator_dbc.h
diff --git a/runtime/vm/simulator_dbc.h b/runtime/vm/simulator_dbc.h
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+// Copyright (c) 2016, 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_SIMULATOR_DBC_H_
+#define VM_SIMULATOR_DBC_H_
+
+#ifndef VM_SIMULATOR_H_
+#error Do not include simulator_dbc.h directly; use simulator.h.
+#endif
+
+#include "vm/constants_dbc.h"
+#include "vm/method_recognizer.h"
+
+namespace dart {
+
+class Isolate;
+class RawObject;
+class SimulatorSetjmpBuffer;
+class Thread;
+class Code;
+class Array;
+class RawICData;
+class RawArray;
+class RawObjectPool;
+class RawFunction;
+
+// Simulator intrinsic handler. It is invoked on entry to the intrinsified
+// function via Intrinsic bytecode before the frame is setup.
+// If the handler returns true then Intrinsic bytecode works as a return
+// instruction returning the value in result. Otherwise interpreter proceeds to
+// execute the body of the function.
+typedef bool (*IntrinsicHandler)(Thread* thread,
+                                 RawObject** FP,
+                                 RawObject** result);
+
+
+class Simulator {
+ public:
+  static const uword kSimulatorStackUnderflowSize = 64;
+
+  Simulator();
+  ~Simulator();
+
+  // The currently executing Simulator instance, which is associated to the
+  // current isolate
+  static Simulator* Current();
+
+  // Accessors to the internal simulator stack base and top.
+  uword StackBase() const { return reinterpret_cast<uword>(stack_); }
+  uword StackTop() const;
+
+  // The isolate's top_exit_frame_info refers to a Dart frame in the simulator
+  // stack. The simulator's top_exit_frame_info refers to a C++ frame in the
+  // native stack.
+  uword top_exit_frame_info() const { return top_exit_frame_info_; }
+  void set_top_exit_frame_info(uword value) { top_exit_frame_info_ = value; }
+
+  // Call on program start.
+  static void InitOnce();
+
+  RawObject* Call(const Code& code,
+                  const Array& arguments_descriptor,
+                  const Array& arguments,
+                  Thread* thread);
+
+  void Longjmp(uword pc,
+               uword sp,
+               uword fp,
+               RawObject* raw_exception,
+               RawObject* raw_stacktrace,
+               Thread* thread);
+
+  uword get_sp() const {
+    return reinterpret_cast<uword>(sp_);
+  }
+
+  enum IntrinsicId {
+#define V(test_class_name, test_function_name, enum_name, fp) \
+    k##enum_name##Intrinsic,
+  ALL_INTRINSICS_LIST(V)
+  GRAPH_INTRINSICS_LIST(V)
+#undef V
+    kIntrinsicCount,
+  };
+
+  static bool IsSupportedIntrinsic(IntrinsicId id) {
+    return intrinsics_[id] != NULL;
+  }
+
+  enum SpecialIndex {
+    kExceptionSpecialIndex,
+    kStacktraceSpecialIndex,
+    kSpecialIndexCount
+  };
+
+ private:
+  uintptr_t* stack_;
+
+  RawObject** fp_;
+  RawObject** sp_;
+  uword pc_;
+
+  SimulatorSetjmpBuffer* last_setjmp_buffer_;
+  uword top_exit_frame_info_;
+
+  RawObject* special_[kSpecialIndexCount];
+
+  static IntrinsicHandler intrinsics_[kIntrinsicCount];
+
+  void Exit(Thread* thread,
+            RawObject** base,
+            RawObject** exit_frame,
+            uint32_t* pc);
+
+  void CallRuntime(Thread* thread,
+                   RawObject** base,
+                   RawObject** exit_frame,
+                   uint32_t* pc,
+                   intptr_t argc_tag,
+                   RawObject** args,
+                   RawObject** result,
+                   uword target);
+
+  void Invoke(Thread* thread,
+              RawObject** call_base,
+              RawObject** call_top,
+              RawObjectPool** pp,
+              uint32_t** pc,
+              RawObject*** B,
+              RawObject*** SP);
+
+  void InlineCacheMiss(int checked_args,
+                       Thread* thread,
+                       RawICData* icdata,
+                       RawObject** call_base,
+                       RawObject** top,
+                       uint32_t* pc,
+                       RawObject** B, RawObject** SP);
+
+  void InstanceCall1(Thread* thread,
+                     RawICData* icdata,
+                     RawObject** call_base,
+                     RawObject** call_top,
+                     RawArray** argdesc,
+                     RawObjectPool** pp,
+                     uint32_t** pc,
+                     RawObject*** B, RawObject*** SP);
+
+  void InstanceCall2(Thread* thread,
+                     RawICData* icdata,
+                     RawObject** call_base,
+                     RawObject** call_top,
+                     RawArray** argdesc,
+                     RawObjectPool** pp,
+                     uint32_t** pc,
+                     RawObject*** B, RawObject*** SP);
+
+  void InstanceCall3(Thread* thread,
+                     RawICData* icdata,
+                     RawObject** call_base,
+                     RawObject** call_top,
+                     RawArray** argdesc,
+                     RawObjectPool** pp,
+                     uint32_t** pc,
+                     RawObject*** B, RawObject*** SP);
+
+  // Longjmp support for exceptions.
+  SimulatorSetjmpBuffer* last_setjmp_buffer() {
+    return last_setjmp_buffer_;
+  }
+  void set_last_setjmp_buffer(SimulatorSetjmpBuffer* buffer) {
+    last_setjmp_buffer_ = buffer;
+  }
+
+  friend class SimulatorSetjmpBuffer;
+  DISALLOW_COPY_AND_ASSIGN(Simulator);
+};
+
+}  // namespace dart
+
+#endif  // VM_SIMULATOR_DBC_H_