A64: Synchronize with r16849.

src/a64/deoptimizer-a64.cc

Index: src/a64/deoptimizer-a64.cc
diff --git a/src/a64/deoptimizer-a64.cc b/src/a64/deoptimizer-a64.cc
index 86fbd7433f04143cc4e3c45b3c5b0bcd11b830db..a17545ce410fca1719beafa03308bc19cb8ca0fc 100644
--- a/src/a64/deoptimizer-a64.cc
+++ b/src/a64/deoptimizer-a64.cc
@@ -80,75 +80,6 @@ void Deoptimizer::PatchCodeForDeoptimization(Isolate* isolate, Code* code) {
 }
 
 
-// The back edge bookkeeping code matches the pattern:
-//
-//  <decrement profiling counter>
-//  .. .. .. ..       b.pl ok
-//  .. .. .. ..       ldr x16, pc+<interrupt stub address>
-//  .. .. .. ..       blr x16
-//  ok-label
-//
-// We patch the code to the following form:
-//
-//  <decrement profiling counter>
-//  .. .. .. ..       mov x0, x0 (NOP)
-//  .. .. .. ..       ldr x16, pc+<on-stack replacement address>
-//  .. .. .. ..       blr x16
-void Deoptimizer::PatchInterruptCodeAt(Code* unoptimized_code,
-                                       Address pc_after,
-                                       Code* replacement_code) {
-  // Turn the jump into a nop.
-  Instruction* jump = Instruction::Cast(pc_after)->preceding(3);
-  PatchingAssembler patcher(jump, 1);
-  patcher.nop(Assembler::INTERRUPT_CODE_NOP);
-
-  // Replace the call address.
-  Instruction* load = Instruction::Cast(pc_after)->preceding(2);
-  Address interrupt_address_pointer =
-      reinterpret_cast<Address>(load) + load->ImmPCOffset();
-  Memory::uint64_at(interrupt_address_pointer) =
-      reinterpret_cast<uint64_t>(replacement_code->entry());
-
-  unoptimized_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch(
-      unoptimized_code, pc_after - 2 * kInstructionSize, replacement_code);
-}
-
-
-void Deoptimizer::RevertInterruptCodeAt(Code* unoptimized_code,
-                                        Address pc_after,
-                                        Code* interrupt_code) {
-  // Turn the nop into a jump.
-  Instruction* jump = Instruction::Cast(pc_after)->preceding(3);
-  PatchingAssembler patcher(jump, 1);
-  patcher.b(6, pl);  // The ok label is 6 instructions later.
-
-  // Replace the call address.
-  Instruction* load = Instruction::Cast(pc_after)->preceding(2);
-  Address interrupt_address_pointer =
-      reinterpret_cast<Address>(load) + load->ImmPCOffset();
-  Memory::uint64_at(interrupt_address_pointer) =
-      reinterpret_cast<uint64_t>(interrupt_code->entry());
-
-  interrupt_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch(
-      unoptimized_code, pc_after - 2 * kInstructionSize, interrupt_code);
-}
-
-
-#ifdef DEBUG
-Deoptimizer::InterruptPatchState Deoptimizer::GetInterruptPatchState(
-    Isolate* isolate,
-    Code* unoptimized_code,
-    Address pc_after) {
-  // TODO(jbramley): There should be some extra assertions here (as in the ARM
-  // back-end), but this function is gone in bleeding_edge so it might not
-  // matter anyway.
-  Instruction* jump_or_nop = Instruction::Cast(pc_after)->preceding(3);
-  return jump_or_nop->IsNop(Assembler::INTERRUPT_CODE_NOP) ? PATCHED_FOR_OSR
-                                                           : NOT_PATCHED;
-}
-#endif
-
-
 void Deoptimizer::FillInputFrame(Address tos, JavaScriptFrame* frame) {
   // Set the register values. The values are not important as there are no
   // callee saved registers in JavaScript frames, so all registers are