Initial SIMDBC interpreter.

runtime/vm/isolate.cc

 // 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.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
@@ skipping 964 matching lines @@
   }
 
   return result;
 }
 
 
 /* static */
 uword Isolate::GetCurrentStackPointer() {
   // Since AddressSanitizer's detect_stack_use_after_return instruments the
   // C++ code to give out fake stack addresses, we call a stub in that case.
-  uword (*func)() = reinterpret_cast<uword (*)()>(
-      StubCode::GetStackPointer_entry()->EntryPoint());
+  uword (*func)() =
+#if !defined(TARGET_ARCH_DBC)
+      reinterpret_cast<uword (*)()>(
+          StubCode::GetStackPointer_entry()->EntryPoint());
+#else
+      NULL;
+#endif
   // But for performance (and to support simulators), we normally use a local.
 #if defined(__has_feature)
 #if __has_feature(address_sanitizer)
   uword current_sp = func();
   return current_sp;
 #else
   uword stack_allocated_local_address = reinterpret_cast<uword>(&func);
   return stack_allocated_local_address;
 #endif
 #else
@@ skipping 52 matching lines @@
   if (ServiceIsolate::NameEquals(name_prefix)) {
     name_ = strdup(name_prefix);
     return;
   }
   name_ = OS::SCreate(NULL, "%s-%" Pd64 "", name_prefix, main_port());
 }
 
 
 void Isolate::SetStackLimitFromStackBase(uword stack_base) {
   // Set stack limit.
+#if !defined(TARGET_ARCH_DBC)
 #if defined(USING_SIMULATOR)
   // Ignore passed-in native stack top and use Simulator stack top.
   Simulator* sim = Simulator::Current();  // May allocate a simulator.
   ASSERT(simulator() == sim);  // This isolate's simulator is the current one.
   stack_base = sim->StackTop();
   // The overflow area is accounted for by the simulator.
-#endif
+#endif  // defined(USING_SIMULATOR)
   SetStackLimit(stack_base - OSThread::GetSpecifiedStackSize());
+#else
+  SetStackLimit(Simulator::Current()->StackTop());
+#endif  // !defined(TARGET_ARCH_DBC)
 }
 
 
 void Isolate::SetStackLimit(uword limit) {
   // The isolate setting the stack limit is not necessarily the isolate which
   // the stack limit is being set on.
   MutexLocker ml(mutex_);
   if (stack_limit_ == saved_stack_limit_) {
     // No interrupt pending, set stack_limit_ too.
     stack_limit_ = limit;
@@ skipping 418 matching lines @@
   uword defer_bits = interrupt_bits & deferred_interrupts_mask_;
   if (defer_bits != 0) {
     deferred_interrupts_ |= defer_bits;
     interrupt_bits &= ~deferred_interrupts_mask_;
     if (interrupt_bits == 0) {
       return;
     }
   }
 
   if (stack_limit_ == saved_stack_limit_) {
+    // On DBC stack is growing upwards so interrupt limit is 0 unlike on all
+    // other architectures.
+#if !defined(TARGET_ARCH_DBC)

[zra, 2016/04/14 18:27:49]

Maybe instead of #if defined,  add a function to stack_frame_*.h

[Vyacheslav Egorov (Google), 2016/04/18 15:56:42]

Done.

     stack_limit_ = (~static_cast<uword>(0)) & ~kInterruptsMask;
+#else
+    stack_limit_ = 0;
+#endif
   }
   stack_limit_ |= interrupt_bits;
 }
 
 
 uword Isolate::GetAndClearInterrupts() {
   MutexLocker ml(mutex_);
   if (stack_limit_ == saved_stack_limit_) {
     return 0;  // No interrupt was requested.
   }
@@ skipping 26 matching lines @@
   }
 }
 
 
 void Isolate::RestoreOOBMessageInterrupts() {
   MutexLocker ml(mutex_);
   ASSERT(deferred_interrupts_mask_ == kMessageInterrupt);
   deferred_interrupts_mask_ = 0;
   if (deferred_interrupts_ != 0) {
     if (stack_limit_ == saved_stack_limit_) {
+      // On DBC stack is growing upwards so interrupt limit is 0 unlike on all
+      // other architectures.
+#if !defined(TARGET_ARCH_DBC)

[zra, 2016/04/14 18:27:48]

ditto

[Vyacheslav Egorov (Google), 2016/04/18 15:56:42]

Done.

       stack_limit_ = (~static_cast<uword>(0)) & ~kInterruptsMask;
+#else
+      stack_limit_ = 0;
+#endif
     }
     stack_limit_ |= deferred_interrupts_;
     deferred_interrupts_ = 0;
   }
   if (FLAG_trace_service && FLAG_trace_service_verbose) {
     OS::Print("[+%" Pd64 "ms] Isolate %s restoring OOB interrupts\n",
               Dart::timestamp(), name());
   }
 }
 
@@ skipping 1276 matching lines @@
 void IsolateSpawnState::DecrementSpawnCount() {
   ASSERT(spawn_count_monitor_ != NULL);
   ASSERT(spawn_count_ != NULL);
   MonitorLocker ml(spawn_count_monitor_);
   ASSERT(*spawn_count_ > 0);
   *spawn_count_ = *spawn_count_ - 1;
   ml.Notify();
 }
 
 }  // namespace dart