Initial SIMDBC interpreter.

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
diff --git a/runtime/vm/code_generator.cc b/runtime/vm/code_generator.cc
index 652cdc25a7e6126c09cc072d077260351e0000fa..921bca2e71567c7f015b558bdfafa454ee90cc38 100644
--- a/runtime/vm/code_generator.cc
+++ b/runtime/vm/code_generator.cc
@@ -677,6 +677,7 @@ static void CheckResultError(const Object& result) {
 }
 
 
+#if !defined(TARGET_ARCH_DBC)
 // Gets called from debug stub when code reaches a breakpoint
 // set on a runtime stub call.
 DEFINE_RUNTIME_ENTRY(BreakpointRuntimeHandler, 0) {
@@ -696,6 +697,20 @@ DEFINE_RUNTIME_ENTRY(BreakpointRuntimeHandler, 0) {
   }
   arguments.SetReturn(orig_stub);
 }
+#else
+// Gets called from the simulator when the breakpoint is reached.
+DEFINE_RUNTIME_ENTRY(BreakpointRuntimeHandler, 0) {
+  if (!FLAG_support_debugger) {
+    UNREACHABLE();
+    return;
+  }
+  const Error& error = Error::Handle(isolate->debugger()->SignalBpReached());
+  if (!error.IsNull()) {
+    Exceptions::PropagateError(error);
+    UNREACHABLE();
+  }
+}
+#endif  // !defined(TARGET_ARCH_DBC)
 
 
 DEFINE_RUNTIME_ENTRY(SingleStepHandler, 0) {
@@ -1023,7 +1038,12 @@ DEFINE_RUNTIME_ENTRY(MegamorphicCacheMissHandler, 3) {
       ASSERT(caller_frame->IsDartFrame());
       const Code& code = Code::Handle(zone, caller_frame->LookupDartCode());
       const Code& stub =
+#if !defined(TARGET_ARCH_DBC)
           Code::Handle(zone, StubCode::MegamorphicLookup_entry()->code());
+#else
+          Code::Handle();
+          UNREACHABLE();
+#endif
       CodePatcher::PatchSwitchableCallAt(caller_frame->pc(),
                                          code, ic_data, cache, stub);
     }
@@ -1212,6 +1232,7 @@ DEFINE_RUNTIME_ENTRY(InvokeClosureNoSuchMethod, 3) {
 }
 
 
+#if !defined(TARGET_ARCH_DBC)
 static bool CanOptimizeFunction(const Function& function, Thread* thread) {
   if (FLAG_support_debugger) {
     Isolate* isolate = thread->isolate();
@@ -1273,10 +1294,13 @@ static bool CanOptimizeFunction(const Function& function, Thread* thread) {
   }
   return true;
 }
+#endif
 
 
 DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
-#if defined(USING_SIMULATOR)
+#if defined(TARGET_ARCH_DBC)
+  uword stack_pos = Simulator::Current()->sp();

[Florian Schneider, 2016/04/12 02:29:58]

Maybe just add a helper sp() to the other simulators.

[Vyacheslav Egorov (Google), 2016/04/12 09:01:21]

Done.

+#elif defined(USING_SIMULATOR)
   uword stack_pos = Simulator::Current()->get_register(SPREG);
 #else
   uword stack_pos = Isolate::GetCurrentStackPointer();
@@ -1289,7 +1313,7 @@ DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
   // If an interrupt happens at the same time as a stack overflow, we
   // process the stack overflow now and leave the interrupt for next
   // time.
-  if (stack_pos < isolate->saved_stack_limit()) {
+  if (IsCalleeFrameOf(isolate->saved_stack_limit(), stack_pos)) {
     // Use the preallocated stack overflow exception to avoid calling
     // into dart code.
     const Instance& exception =
@@ -1369,6 +1393,7 @@ DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
 
   if ((stack_overflow_flags & Isolate::kOsrRequest) != 0) {
     ASSERT(FLAG_use_osr);
+#if !defined(TARGET_ARCH_DBC)
     DartFrameIterator iterator;
     StackFrame* frame = iterator.NextFrame();
     ASSERT(frame != NULL);
@@ -1421,6 +1446,7 @@ DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
       frame->set_pc(optimized_entry);
       frame->set_pc_marker(optimized_code.raw());
     }
+#endif

[Florian Schneider, 2016/04/12 02:29:58]

Maybe add TODO to add OSR support in the future?  Add

#else
  UNREACHABLE()
#endif  // TARGET_ARCH_DBC

[Vyacheslav Egorov (Google), 2016/04/12 09:01:21]

Done.

   }
 }
 
@@ -1445,7 +1471,7 @@ DEFINE_RUNTIME_ENTRY(TraceICCall, 2) {
 // The requesting function can be already optimized (reoptimization).
 // Returns the Code object where to continue execution.
 DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
-#if !defined(DART_PRECOMPILED_RUNTIME)
+#if !defined(DART_PRECOMPILED_RUNTIME) && !defined(TARGET_ARCH_DBC)
   const Function& function = Function::CheckedHandle(zone,
                                                      arguments.ArgAt(0));
   ASSERT(!function.IsNull());