Initial SIMDBC interpreter.

runtime/vm/native_arguments.h

 // Copyright (c) 2012, 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_NATIVE_ARGUMENTS_H_
 #define VM_NATIVE_ARGUMENTS_H_
 
 #include "platform/assert.h"
 #include "platform/memory_sanitizer.h"
 #include "vm/globals.h"
 #include "vm/handles_impl.h"
 #include "vm/simulator.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, trace_natives);
 
 // Forward declarations.
 class BootstrapNatives;
 class Object;
 class RawObject;
 class Simulator;
 class Thread;
 
 #if defined(TESTING) || defined(DEBUG)
 
-#if defined(USING_SIMULATOR)
+#if defined(TARGET_ARCH_DBC)
+// C-stack is always aligned on DBC because we don't have any native code.
+#define CHECK_STACK_ALIGNMENT
+#elif defined(USING_SIMULATOR)
 #define CHECK_STACK_ALIGNMENT {                                                \
   uword current_sp = Simulator::Current()->get_register(SPREG);                \
   ASSERT(Utils::IsAligned(current_sp, OS::ActivationFrameAlignment()));        \
 }
 #elif defined(TARGET_OS_WINDOWS)
 // The compiler may dynamically align the stack on Windows, so do not check.
 #define CHECK_STACK_ALIGNMENT { }
 #else
 #define CHECK_STACK_ALIGNMENT {                                                \
   uword (*func)() = reinterpret_cast<uword (*)()>(                             \
@@ skipping 46 matching lines @@
 // NOTE: Since we pass 'this' as a pass-by-value argument in the stubs we don't
 // have DISALLOW_COPY_AND_ASSIGN in the class definition and do not make it a
 // subclass of ValueObject.
 class NativeArguments {
  public:
   Thread* thread() const { return thread_; }
   int ArgCount() const { return ArgcBits::decode(argc_tag_); }
 
   RawObject* ArgAt(int index) const {
     ASSERT((index >= 0) && (index < ArgCount()));
-    RawObject** arg_ptr = &((*argv_)[-index]);
+#if defined(TARGET_ARCH_DBC)
+    // On DBC stack is growing upwards, in reverse direction from all other
+    // architectures.
+    RawObject** arg_ptr = &(argv_[index]);
+#else
+    RawObject** arg_ptr = &(argv_[-index]);
+#endif
     // Tell MemorySanitizer the RawObject* was initialized (by generated code).
     MSAN_UNPOISON(arg_ptr, kWordSize);
     return *arg_ptr;
   }
 
   bool IsNativeAutoSetupScope() const {
     return AutoSetupScopeBits::decode(argc_tag_);
   }
 
   int NativeArgCount() const {
@@ skipping 91 matching lines @@
   };
   class ArgcBits : public BitField<intptr_t, int32_t, kArgcBit, kArgcSize> {};
   class FunctionBits :
       public BitField<intptr_t, int, kFunctionBit, kFunctionSize> {};
   class AutoSetupScopeBits :
       public BitField<intptr_t, int, kAutoSetupScopeBit, 1> {};
   friend class Api;
   friend class BootstrapNatives;
   friend class Simulator;
 
+#if defined(TARGET_ARCH_DBC)
+  // Allow simulator to create NativeArguments on the stack.
+  NativeArguments(Thread* thread,
+                  int argc_tag,
+                  RawObject** argv,
+                  RawObject** retval)
+      : thread_(thread), argc_tag_(argc_tag), argv_(argv), retval_(retval) {
+  }
+#endif
+
   // Since this function is passed a RawObject directly, we need to be
   // exceedingly careful when we use it.  If there are any other side
   // effects in the statement that may cause GC, it could lead to
   // bugs.
   void SetReturnUnsafe(RawObject* value) const {
     *retval_ = value;
   }
 
   // Returns true if the arguments are those of an instance function call.
   bool ToInstanceFunction() const {
@@ skipping 11 matching lines @@
     // the context and the closure at index 0 is hidden, so the apparent
     // argument count remains unchanged.
     if (function_bits == kClosureFunctionBit) {
       return 1;
     }
     return 0;
   }
 
   Thread* thread_;  // Current thread pointer.
   intptr_t argc_tag_;  // Encodes argument count and invoked native call type.
-  RawObject*(*argv_)[];  // Pointer to an array of arguments to runtime call.
+  RawObject** argv_;  // Pointer to an array of arguments to runtime call.
   RawObject** retval_;  // Pointer to the return value area.
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ARGUMENTS_H_