Switchable call scheduling.

runtime/vm/instructions_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"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/constants_arm64.h"
 #include "vm/cpu.h"
@@ skipping 324 matching lines @@
 
 SwitchableCallPattern::SwitchableCallPattern(uword pc, const Code& code)
     : object_pool_(ObjectPool::Handle(code.GetObjectPool())),
       data_pool_index_(-1),
       target_pool_index_(-1) {
   ASSERT(code.ContainsInstructionAt(pc));
   // Last instruction: blr ip0.
   ASSERT(*(reinterpret_cast<uint32_t*>(pc) - 1) == 0xd63f0200);
 
   Register reg;
-  uword stub_load_end =
-      InstructionPattern::DecodeLoadWordFromPool(pc - 2 * Instr::kInstrSize,
+  uword data_load_end =
+      InstructionPattern::DecodeLoadWordFromPool(pc - Instr::kInstrSize,
                                                  &reg,
-                                                 &target_pool_index_);
+                                                 &data_pool_index_);
+  ASSERT(reg == R5);
+  InstructionPattern::DecodeLoadWordFromPool(data_load_end - Instr::kInstrSize,
+                                             &reg,
+                                             &target_pool_index_);
   ASSERT(reg == CODE_REG);
-  InstructionPattern::DecodeLoadWordFromPool(stub_load_end,
-                                             &reg,
-                                             &data_pool_index_);
-  ASSERT(reg == R5);
 }
 
 
 RawObject* SwitchableCallPattern::data() const {
   return object_pool_.ObjectAt(data_pool_index_);
 }
 
 
 RawCode* SwitchableCallPattern::target() const {
   return reinterpret_cast<RawCode*>(
@@ skipping 21 matching lines @@
 bool ReturnPattern::IsValid() const {
   Instr* bx_lr = Instr::At(pc_);
   const Register crn = ConcreteRegister(LR);
   const int32_t instruction = RET | (static_cast<int32_t>(crn) << kRnShift);
   return bx_lr->InstructionBits() == instruction;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64