Revert "Lazy deopt without code patching."

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 315 matching lines @@
       object_pool_.ObjectAt(target_code_pool_index_));
 }
 
 
 void CallPattern::SetTargetCode(const Code& target) const {
   object_pool_.SetObjectAt(target_code_pool_index_, target);
   // No need to flush the instruction cache, since the code is not modified.
 }
 
 
+void CallPattern::InsertDeoptCallAt(uword pc, uword target_address) {
+  Instr* movz0 = Instr::At(pc + (0 * Instr::kInstrSize));
+  Instr* movk1 = Instr::At(pc + (1 * Instr::kInstrSize));
+  Instr* movk2 = Instr::At(pc + (2 * Instr::kInstrSize));
+  Instr* movk3 = Instr::At(pc + (3 * Instr::kInstrSize));
+  Instr* blr = Instr::At(pc + (4 * Instr::kInstrSize));
+  const uint32_t w0 = Utils::Low32Bits(target_address);
+  const uint32_t w1 = Utils::High32Bits(target_address);
+  const uint16_t h0 = Utils::Low16Bits(w0);
+  const uint16_t h1 = Utils::High16Bits(w0);
+  const uint16_t h2 = Utils::Low16Bits(w1);
+  const uint16_t h3 = Utils::High16Bits(w1);
+
+  movz0->SetMoveWideBits(MOVZ, IP0, h0, 0, kDoubleWord);
+  movk1->SetMoveWideBits(MOVK, IP0, h1, 1, kDoubleWord);
+  movk2->SetMoveWideBits(MOVK, IP0, h2, 2, kDoubleWord);
+  movk3->SetMoveWideBits(MOVK, IP0, h3, 3, kDoubleWord);
+  blr->SetUnconditionalBranchRegBits(BLR, IP0);
+
+  ASSERT(kDeoptCallLengthInBytes == 5 * Instr::kInstrSize);
+  CPU::FlushICache(pc, kDeoptCallLengthInBytes);
+}
+
+
 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 =
@@ skipping 39 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