Enable concurrent sweep on MIPS and ARM64.

runtime/vm/simulator_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 <setjmp.h>  // NOLINT
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
@@ skipping 1205 matching lines @@
 }
 
 
 void Simulator::ClearExclusive() {
   MutexLocker ml(exclusive_access_lock_);
   // Remove the reservation for this thread.
   SetExclusiveAccess(NULL);
 }
 
 
-intptr_t Simulator::ReadExclusiveW(uword addr, Instr* instr) {
+intptr_t Simulator::ReadExclusiveX(uword addr, Instr* instr) {
   MutexLocker ml(exclusive_access_lock_);
   SetExclusiveAccess(addr);
-  return ReadW(addr, instr);
+  return ReadX(addr, instr);
 }
 
 
-intptr_t Simulator::WriteExclusiveW(uword addr, intptr_t value, Instr* instr) {
+intptr_t Simulator::WriteExclusiveX(uword addr, intptr_t value, Instr* instr) {
   MutexLocker ml(exclusive_access_lock_);
   bool write_allowed = HasExclusiveAccessAndOpen(addr);
   if (write_allowed) {
-    WriteW(addr, value, instr);
+    WriteX(addr, value, instr);
     return 0;  // Success.
   }
   return 1;  // Failure.
 }
 
 
 uword Simulator::CompareExchange(uword* address,
                                  uword compare_value,
                                  uword new_value) {
   MutexLocker ml(exclusive_access_lock_);
@@ skipping 494 matching lines @@
     } else {
       UnimplementedInstruction(instr);
     }
   } else {
     UnimplementedInstruction(instr);
   }
 }
 
 
 void Simulator::DecodeSystem(Instr* instr) {
+  if (instr->InstructionBits() == CLREX) {
+    // Format(instr, "clrex");
+    ClearExclusive();
+    return;
+  }
+
   if ((instr->Bits(0, 8) == 0x1f) && (instr->Bits(12, 4) == 2) &&
       (instr->Bits(16, 3) == 3) && (instr->Bits(19, 2) == 0) &&
       (instr->Bit(21) == 0)) {
     if (instr->Bits(8, 4) == 0) {
       // Format(instr, "nop");
     } else {
       UnimplementedInstruction(instr);
     }
   } else {
     UnimplementedInstruction(instr);
@@ skipping 395 matching lines @@
   if (instr->Bit(30)) {
     // Format(instr, "ldrx 'rt, 'pcldr");
     set_register(instr, rt, val, R31IsZR);
   } else {
     // Format(instr, "ldrw 'rt, 'pcldr");
     set_wregister(rt, static_cast<int32_t>(val), R31IsZR);
   }
 }
 
 
+void Simulator::DecodeLoadStoreExclusive(Instr* instr) {
+  if ((instr->Bit(23) != 0) ||
+      (instr->Bit(21) != 0) ||
+      (instr->Bit(15) != 0)) {
+    UNIMPLEMENTED();
+  }
+  const int32_t size = instr->Bits(30, 2);
+  if (size != 3) {
+    UNIMPLEMENTED();
+  }
+
+  const Register rs = instr->RsField();
+  const Register rn = instr->RnField();
+  const Register rt = instr->RtField();
+  const bool is_load = instr->Bit(22) == 1;
+  if (is_load) {
+    // Format(instr, "ldxr 'rt, 'rn");
+    const int64_t addr = get_register(rn, R31IsSP);
+    intptr_t value = ReadExclusiveX(addr, instr);
+    set_register(instr, rt, value, R31IsSP);
+  } else {
+    // Format(instr, "stxr 'rs, 'rt, 'rn");
+    uword value = get_register(rt, R31IsSP);
+    uword addr = get_register(rn, R31IsSP);
+    intptr_t status = WriteExclusiveX(addr, value, instr);
+    set_register(instr, rs, status, R31IsSP);
+  }
+}
+
+
 void Simulator::DecodeLoadStore(Instr* instr) {
   if (instr->IsLoadStoreRegOp()) {
     DecodeLoadStoreReg(instr);
   } else if (instr->IsLoadStoreRegPairOp()) {
     DecodeLoadStoreRegPair(instr);
   } else if (instr->IsLoadRegLiteralOp()) {
     DecodeLoadRegLiteral(instr);
+  } else if (instr->IsLoadStoreExclusiveOp()) {
+    DecodeLoadStoreExclusive(instr);
   } else {
     UnimplementedInstruction(instr);
   }
 }
 
 
 int64_t Simulator::ShiftOperand(uint8_t reg_size,
                                 int64_t value,
                                 Shift shift_type,
                                 uint8_t amount) {
@@ skipping 1384 matching lines @@
   set_register(NULL, kExceptionObjectReg, bit_cast<int64_t>(raw_exception));
   set_register(NULL, kStackTraceObjectReg, bit_cast<int64_t>(raw_stacktrace));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(USING_SIMULATOR)
 
 #endif  // defined TARGET_ARCH_ARM64