Adds simulator debugger and Stop to arm64.

runtime/vm/assembler_arm64.cc

 // Copyright (c) 2014, 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/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
 #include "vm/simulator.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 
 // An extra check since we are assuming the existence of /proc/cpuinfo below.
 #if !defined(USING_SIMULATOR) && !defined(__linux__) && !defined(ANDROID)
 #error ARM64 cross-compile only supported on Linux
 #endif
 
 namespace dart {
 
-DEFINE_FLAG(bool, print_stop_message, true, "Print stop message.");
+DEFINE_FLAG(bool, print_stop_message, false, "Print stop message.");
 DECLARE_FLAG(bool, inline_alloc);
 
 
 Assembler::Assembler(bool use_far_branches)
     : buffer_(),
       object_pool_(GrowableObjectArray::Handle()),
       patchable_pool_entries_(),
       prologue_offset_(-1),
       use_far_branches_(use_far_branches),
       comments_() {
@@ skipping 22 matching lines @@
   ASSERT(Utils::IsAligned(data, 4));
   ASSERT(Utils::IsAligned(length, 4));
   const uword end = data + length;
   while (data < end) {
     *reinterpret_cast<int32_t*>(data) = Instr::kBreakPointInstruction;
     data += 4;
   }
 }
 
 
-void Assembler::Stop(const char* message) {
-  UNIMPLEMENTED();
-}
-
-
 void Assembler::Emit(int32_t value) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   buffer_.Emit<int32_t>(value);
 }
 
 
 static const char* cpu_reg_names[kNumberOfCpuRegisters] = {
   "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
   "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
   "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
@@ skipping 31 matching lines @@
     const int64_t dest = bound_pc - position;
     const int32_t next = buffer_.Load<int32_t>(position);
     const int32_t encoded = EncodeImm19BranchOffset(dest, next);
     buffer_.Store<int32_t>(position, encoded);
     label->position_ = DecodeImm19BranchOffset(next);
   }
   label->BindTo(bound_pc);
 }
 
 
+void Assembler::Stop(const char* message) {
+  if (FLAG_print_stop_message) {
+    UNIMPLEMENTED();
+  }
+  Label stop;
+  b(&stop);
+  Emit(Utils::Low32Bits(reinterpret_cast<int64_t>(message)));
+  Emit(Utils::High32Bits(reinterpret_cast<int64_t>(message)));
+  Bind(&stop);
+  hlt(kImmExceptionIsDebug);
+}
+
+
 static int CountLeadingZeros(uint64_t value, int width) {
   ASSERT((width == 32) || (width == 64));
   if (value == 0) {
     return width;
   }
   int count = 0;
   do {
     count++;
   } while (value >>= 1);
   return width - count;
@@ skipping 299 matching lines @@
       } else {
         movz(reg, h3, 3);
       }
     }
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64