compiler/optimizing/instruction_builder.cc

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "instruction_builder.h"

#include "art_method-inl.h"
#include "bytecode_utils.h"
#include "class_linker.h"
#include "dex_instruction-inl.h"
#include "driver/compiler_options.h"
#include "imtable-inl.h"
#include "quicken_info.h"
#include "scoped_thread_state_change-inl.h"
#include "sharpening.h"

namespace art {

HBasicBlock* HInstructionBuilder::FindBlockStartingAt(uint32_t dex_pc) const {
  return block_builder_->GetBlockAt(dex_pc);
}

inline ArenaVector<HInstruction*>* HInstructionBuilder::GetLocalsFor(HBasicBlock* block) {
  ArenaVector<HInstruction*>* locals = &locals_for_[block->GetBlockId()];
  const size_t vregs = graph_->GetNumberOfVRegs();
  if (locals->size() == vregs) {
    return locals;
  }
  return GetLocalsForWithAllocation(block, locals, vregs);
}

ArenaVector<HInstruction*>* HInstructionBuilder::GetLocalsForWithAllocation(
    HBasicBlock* block,
    ArenaVector<HInstruction*>* locals,
    const size_t vregs) {
  DCHECK_NE(locals->size(), vregs);
  locals->resize(vregs, nullptr);
  if (block->IsCatchBlock()) {
    // We record incoming inputs of catch phis at throwing instructions and
    // must therefore eagerly create the phis. Phis for undefined vregs will
    // be deleted when the first throwing instruction with the vreg undefined
    // is encountered. Unused phis will be removed by dead phi analysis.
    for (size_t i = 0; i < vregs; ++i) {
      // No point in creating the catch phi if it is already undefined at
      // the first throwing instruction.
      HInstruction* current_local_value = (*current_locals_)[i];
      if (current_local_value != nullptr) {
        HPhi* phi = new (arena_) HPhi(
            arena_,
            i,
            0,
            current_local_value->GetType());
        block->AddPhi(phi);
        (*locals)[i] = phi;
      }
    }
  }
  return locals;
}

inline HInstruction* HInstructionBuilder::ValueOfLocalAt(HBasicBlock* block, size_t local) {
  ArenaVector<HInstruction*>* locals = GetLocalsFor(block);
  return (*locals)[local];
}

void HInstructionBuilder::InitializeBlockLocals() {
  current_locals_ = GetLocalsFor(current_block_);

  if (current_block_->IsCatchBlock()) {
    // Catch phis were already created and inputs collected from throwing sites.
    if (kIsDebugBuild) {
      // Make sure there was at least one throwing instruction which initialized
      // locals (guaranteed by HGraphBuilder) and that all try blocks have been
      // visited already (from HTryBoundary scoping and reverse post order).
      bool catch_block_visited = false;
      for (HBasicBlock* current : graph_->GetReversePostOrder()) {
        if (current == current_block_) {
          catch_block_visited = true;
        } else if (current->IsTryBlock()) {
          const HTryBoundary& try_entry = current->GetTryCatchInformation()->GetTryEntry();
          if (try_entry.HasExceptionHandler(*current_block_)) {
            DCHECK(!catch_block_visited) << "Catch block visited before its try block.";
          }
        }
      }
      DCHECK_EQ(current_locals_->size(), graph_->GetNumberOfVRegs())
          << "No instructions throwing into a live catch block.";
    }
  } else if (current_block_->IsLoopHeader()) {
    // If the block is a loop header, we know we only have visited the pre header
    // because we are visiting in reverse post order. We create phis for all initialized
    // locals from the pre header. Their inputs will be populated at the end of
    // the analysis.
    for (size_t local = 0; local < current_locals_->size(); ++local) {
      HInstruction* incoming =
          ValueOfLocalAt(current_block_->GetLoopInformation()->GetPreHeader(), local);
      if (incoming != nullptr) {
        HPhi* phi = new (arena_) HPhi(
            arena_,
            local,
            0,
            incoming->GetType());
        current_block_->AddPhi(phi);
        (*current_locals_)[local] = phi;
      }
    }

    // Save the loop header so that the last phase of the analysis knows which
    // blocks need to be updated.
    loop_headers_.push_back(current_block_);
  } else if (current_block_->GetPredecessors().size() > 0) {
    // All predecessors have already been visited because we are visiting in reverse post order.
    // We merge the values of all locals, creating phis if those values differ.
    for (size_t local = 0; local < current_locals_->size(); ++local) {
      bool one_predecessor_has_no_value = false;
      bool is_different = false;
      HInstruction* value = ValueOfLocalAt(current_block_->GetPredecessors()[0], local);

      for (HBasicBlock* predecessor : current_block_->GetPredecessors()) {
        HInstruction* current = ValueOfLocalAt(predecessor, local);
        if (current == nullptr) {
          one_predecessor_has_no_value = true;
          break;
        } else if (current != value) {
          is_different = true;
        }
      }

      if (one_predecessor_has_no_value) {
        // If one predecessor has no value for this local, we trust the verifier has
        // successfully checked that there is a store dominating any read after this block.
        continue;
      }

      if (is_different) {
        HInstruction* first_input = ValueOfLocalAt(current_block_->GetPredecessors()[0], local);
        HPhi* phi = new (arena_) HPhi(
            arena_,
            local,
            current_block_->GetPredecessors().size(),
            first_input->GetType());
        for (size_t i = 0; i < current_block_->GetPredecessors().size(); i++) {
          HInstruction* pred_value = ValueOfLocalAt(current_block_->GetPredecessors()[i], local);
          phi->SetRawInputAt(i, pred_value);
        }
        current_block_->AddPhi(phi);
        value = phi;
      }
      (*current_locals_)[local] = value;
    }
  }
}

void HInstructionBuilder::PropagateLocalsToCatchBlocks() {
  const HTryBoundary& try_entry = current_block_->GetTryCatchInformation()->GetTryEntry();
  for (HBasicBlock* catch_block : try_entry.GetExceptionHandlers()) {
    ArenaVector<HInstruction*>* handler_locals = GetLocalsFor(catch_block);
    DCHECK_EQ(handler_locals->size(), current_locals_->size());
    for (size_t vreg = 0, e = current_locals_->size(); vreg < e; ++vreg) {
      HInstruction* handler_value = (*handler_locals)[vreg];
      if (handler_value == nullptr) {
        // Vreg was undefined at a previously encountered throwing instruction
        // and the catch phi was deleted. Do not record the local value.
        continue;
      }
      DCHECK(handler_value->IsPhi());

      HInstruction* local_value = (*current_locals_)[vreg];
      if (local_value == nullptr) {
        // This is the first instruction throwing into `catch_block` where
        // `vreg` is undefined. Delete the catch phi.
        catch_block->RemovePhi(handler_value->AsPhi());
        (*handler_locals)[vreg] = nullptr;
      } else {
        // Vreg has been defined at all instructions throwing into `catch_block`
        // encountered so far. Record the local value in the catch phi.
        handler_value->AsPhi()->AddInput(local_value);
      }
    }
  }
}

void HInstructionBuilder::AppendInstruction(HInstruction* instruction) {
  current_block_->AddInstruction(instruction);
  InitializeInstruction(instruction);
}

void HInstructionBuilder::InsertInstructionAtTop(HInstruction* instruction) {
  if (current_block_->GetInstructions().IsEmpty()) {
    current_block_->AddInstruction(instruction);
  } else {
    current_block_->InsertInstructionBefore(instruction, current_block_->GetFirstInstruction());
  }
  InitializeInstruction(instruction);
}

void HInstructionBuilder::InitializeInstruction(HInstruction* instruction) {
  if (instruction->NeedsEnvironment()) {
    HEnvironment* environment = new (arena_) HEnvironment(
        arena_,
        current_locals_->size(),
        graph_->GetArtMethod(),
        instruction->GetDexPc(),
        instruction);
    environment->CopyFrom(*current_locals_);
    instruction->SetRawEnvironment(environment);
  }
}

HInstruction* HInstructionBuilder::LoadNullCheckedLocal(uint32_t register_index, uint32_t dex_pc) {
  HInstruction* ref = LoadLocal(register_index, Primitive::kPrimNot);
  if (!ref->CanBeNull()) {
    return ref;
  }

  HNullCheck* null_check = new (arena_) HNullCheck(ref, dex_pc);
  AppendInstruction(null_check);
  return null_check;
}

void HInstructionBuilder::SetLoopHeaderPhiInputs() {
  for (size_t i = loop_headers_.size(); i > 0; --i) {
    HBasicBlock* block = loop_headers_[i - 1];
    for (HInstructionIterator it(block->GetPhis()); !it.Done(); it.Advance()) {
      HPhi* phi = it.Current()->AsPhi();
      size_t vreg = phi->GetRegNumber();
      for (HBasicBlock* predecessor : block->GetPredecessors()) {
        HInstruction* value = ValueOfLocalAt(predecessor, vreg);
        if (value == nullptr) {
          // Vreg is undefined at this predecessor. Mark it dead and leave with
          // fewer inputs than predecessors. SsaChecker will fail if not removed.
          phi->SetDead();
          break;
        } else {
          phi->AddInput(value);
        }
      }
    }
  }
}

static bool IsBlockPopulated(HBasicBlock* block) {
  if (block->IsLoopHeader()) {
    // Suspend checks were inserted into loop headers during building of dominator tree.
    DCHECK(block->GetFirstInstruction()->IsSuspendCheck());
    return block->GetFirstInstruction() != block->GetLastInstruction();
  } else {
    return !block->GetInstructions().IsEmpty();
  }
}

bool HInstructionBuilder::Build() {
  locals_for_.resize(graph_->GetBlocks().size(),
                     ArenaVector<HInstruction*>(arena_->Adapter(kArenaAllocGraphBuilder)));

  // Find locations where we want to generate extra stackmaps for native debugging.
  // This allows us to generate the info only at interesting points (for example,
  // at start of java statement) rather than before every dex instruction.
  const bool native_debuggable = compiler_driver_ != nullptr &&
                                 compiler_driver_->GetCompilerOptions().GetNativeDebuggable();
  ArenaBitVector* native_debug_info_locations = nullptr;
  if (native_debuggable) {
    const uint32_t num_instructions = code_item_.insns_size_in_code_units_;
    native_debug_info_locations = new (arena_) ArenaBitVector (arena_, num_instructions, false);
    FindNativeDebugInfoLocations(native_debug_info_locations);
  }

  for (HBasicBlock* block : graph_->GetReversePostOrder()) {
    current_block_ = block;
    uint32_t block_dex_pc = current_block_->GetDexPc();

    InitializeBlockLocals();

    if (current_block_->IsEntryBlock()) {
      InitializeParameters();
      AppendInstruction(new (arena_) HSuspendCheck(0u));
      AppendInstruction(new (arena_) HGoto(0u));
      continue;
    } else if (current_block_->IsExitBlock()) {
      AppendInstruction(new (arena_) HExit());
      continue;
    } else if (current_block_->IsLoopHeader()) {
      HSuspendCheck* suspend_check = new (arena_) HSuspendCheck(current_block_->GetDexPc());
      current_block_->GetLoopInformation()->SetSuspendCheck(suspend_check);
      // This is slightly odd because the loop header might not be empty (TryBoundary).
      // But we're still creating the environment with locals from the top of the block.
      InsertInstructionAtTop(suspend_check);
    }

    if (block_dex_pc == kNoDexPc || current_block_ != block_builder_->GetBlockAt(block_dex_pc)) {
      // Synthetic block that does not need to be populated.
      DCHECK(IsBlockPopulated(current_block_));
      continue;
    }

    DCHECK(!IsBlockPopulated(current_block_));

    uint32_t quicken_index = 0;
    if (CanDecodeQuickenedInfo()) {
      quicken_index = block_builder_->GetQuickenIndex(block_dex_pc);
    }

    for (CodeItemIterator it(code_item_, block_dex_pc); !it.Done(); it.Advance()) {
      if (current_block_ == nullptr) {
        // The previous instruction ended this block.
        break;
      }

      uint32_t dex_pc = it.CurrentDexPc();
      if (dex_pc != block_dex_pc && FindBlockStartingAt(dex_pc) != nullptr) {
        // This dex_pc starts a new basic block.
        break;
      }

      if (current_block_->IsTryBlock() && IsThrowingDexInstruction(it.CurrentInstruction())) {
        PropagateLocalsToCatchBlocks();
      }

      if (native_debuggable && native_debug_info_locations->IsBitSet(dex_pc)) {
        AppendInstruction(new (arena_) HNativeDebugInfo(dex_pc));
      }

      if (!ProcessDexInstruction(it.CurrentInstruction(), dex_pc, quicken_index)) {
        return false;
      }

      if (QuickenInfoTable::NeedsIndexForInstruction(&it.CurrentInstruction())) {
        ++quicken_index;
      }
    }

    if (current_block_ != nullptr) {
      // Branching instructions clear current_block, so we know the last
      // instruction of the current block is not a branching instruction.
      // We add an unconditional Goto to the next block.
      DCHECK_EQ(current_block_->GetSuccessors().size(), 1u);
      AppendInstruction(new (arena_) HGoto());
    }
  }

  SetLoopHeaderPhiInputs();

  return true;
}

void HInstructionBuilder::FindNativeDebugInfoLocations(ArenaBitVector* locations) {
  // The callback gets called when the line number changes.
  // In other words, it marks the start of new java statement.
  struct Callback {
    static bool Position(void* ctx, const DexFile::PositionInfo& entry) {
      static_cast<ArenaBitVector*>(ctx)->SetBit(entry.address_);
      return false;
    }
  };
  dex_file_->DecodeDebugPositionInfo(&code_item_, Callback::Position, locations);
  // Instruction-specific tweaks.
  const Instruction* const begin = Instruction::At(code_item_.insns_);
  const Instruction* const end = begin->RelativeAt(code_item_.insns_size_in_code_units_);
  for (const Instruction* inst = begin; inst < end; inst = inst->Next()) {
    switch (inst->Opcode()) {
      case Instruction::MOVE_EXCEPTION: {
        // Stop in native debugger after the exception has been moved.
        // The compiler also expects the move at the start of basic block so
        // we do not want to interfere by inserting native-debug-info before it.
        locations->ClearBit(inst->GetDexPc(code_item_.insns_));
        const Instruction* next = inst->Next();
        if (next < end) {
          locations->SetBit(next->GetDexPc(code_item_.insns_));
        }
        break;
      }
      default:
        break;
    }
  }
}

HInstruction* HInstructionBuilder::LoadLocal(uint32_t reg_number, Primitive::Type type) const {
  HInstruction* value = (*current_locals_)[reg_number];
  DCHECK(value != nullptr);

  // If the operation requests a specific type, we make sure its input is of that type.
  if (type != value->GetType()) {
    if (Primitive::IsFloatingPointType(type)) {
      value = ssa_builder_->GetFloatOrDoubleEquivalent(value, type);
    } else if (type == Primitive::kPrimNot) {
      value = ssa_builder_->GetReferenceTypeEquivalent(value);
    }
    DCHECK(value != nullptr);
  }

  return value;
}

void HInstructionBuilder::UpdateLocal(uint32_t reg_number, HInstruction* stored_value) {
  Primitive::Type stored_type = stored_value->GetType();
  DCHECK_NE(stored_type, Primitive::kPrimVoid);

  // Storing into vreg `reg_number` may implicitly invalidate the surrounding
  // registers. Consider the following cases:
  // (1) Storing a wide value must overwrite previous values in both `reg_number`
  //     and `reg_number+1`. We store `nullptr` in `reg_number+1`.
  // (2) If vreg `reg_number-1` holds a wide value, writing into `reg_number`
  //     must invalidate it. We store `nullptr` in `reg_number-1`.
  // Consequently, storing a wide value into the high vreg of another wide value
  // will invalidate both `reg_number-1` and `reg_number+1`.

  if (reg_number != 0) {
    HInstruction* local_low = (*current_locals_)[reg_number - 1];
    if (local_low != nullptr && Primitive::Is64BitType(local_low->GetType())) {
      // The vreg we are storing into was previously the high vreg of a pair.
      // We need to invalidate its low vreg.
      DCHECK((*current_locals_)[reg_number] == nullptr);
      (*current_locals_)[reg_number - 1] = nullptr;
    }
  }

  (*current_locals_)[reg_number] = stored_value;
  if (Primitive::Is64BitType(stored_type)) {
    // We are storing a pair. Invalidate the instruction in the high vreg.
    (*current_locals_)[reg_number + 1] = nullptr;
  }
}

void HInstructionBuilder::InitializeParameters() {
  DCHECK(current_block_->IsEntryBlock());

  // dex_compilation_unit_ is null only when unit testing.
  if (dex_compilation_unit_ == nullptr) {
    return;
  }

  const char* shorty = dex_compilation_unit_->GetShorty();
  uint16_t number_of_parameters = graph_->GetNumberOfInVRegs();
  uint16_t locals_index = graph_->GetNumberOfLocalVRegs();
  uint16_t parameter_index = 0;

  const DexFile::MethodId& referrer_method_id =
      dex_file_->GetMethodId(dex_compilation_unit_->GetDexMethodIndex());
  if (!dex_compilation_unit_->IsStatic()) {
    // Add the implicit 'this' argument, not expressed in the signature.
    HParameterValue* parameter = new (arena_) HParameterValue(*dex_file_,
                                                              referrer_method_id.class_idx_,
                                                              parameter_index++,
                                                              Primitive::kPrimNot,
                                                              /* is_this */ true);
    AppendInstruction(parameter);
    UpdateLocal(locals_index++, parameter);
    number_of_parameters--;
    current_this_parameter_ = parameter;
  } else {
    DCHECK(current_this_parameter_ == nullptr);
  }

  const DexFile::ProtoId& proto = dex_file_->GetMethodPrototype(referrer_method_id);
  const DexFile::TypeList* arg_types = dex_file_->GetProtoParameters(proto);
  for (int i = 0, shorty_pos = 1; i < number_of_parameters; i++) {
    HParameterValue* parameter = new (arena_) HParameterValue(
        *dex_file_,
        arg_types->GetTypeItem(shorty_pos - 1).type_idx_,
        parameter_index++,
        Primitive::GetType(shorty[shorty_pos]),
        /* is_this */ false);
    ++shorty_pos;
    AppendInstruction(parameter);
    // Store the parameter value in the local that the dex code will use
    // to reference that parameter.
    UpdateLocal(locals_index++, parameter);
    if (Primitive::Is64BitType(parameter->GetType())) {
      i++;
      locals_index++;
      parameter_index++;
    }
  }
}

template<typename T>
void HInstructionBuilder::If_22t(const Instruction& instruction, uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegA(), Primitive::kPrimInt);
  HInstruction* second = LoadLocal(instruction.VRegB(), Primitive::kPrimInt);
  T* comparison = new (arena_) T(first, second, dex_pc);
  AppendInstruction(comparison);
  AppendInstruction(new (arena_) HIf(comparison, dex_pc));
  current_block_ = nullptr;
}

template<typename T>
void HInstructionBuilder::If_21t(const Instruction& instruction, uint32_t dex_pc) {
  HInstruction* value = LoadLocal(instruction.VRegA(), Primitive::kPrimInt);
  T* comparison = new (arena_) T(value, graph_->GetIntConstant(0, dex_pc), dex_pc);
  AppendInstruction(comparison);
  AppendInstruction(new (arena_) HIf(comparison, dex_pc));
  current_block_ = nullptr;
}

template<typename T>
void HInstructionBuilder::Unop_12x(const Instruction& instruction,
                                   Primitive::Type type,
                                   uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegB(), type);
  AppendInstruction(new (arena_) T(type, first, dex_pc));
  UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
}

void HInstructionBuilder::Conversion_12x(const Instruction& instruction,
                                         Primitive::Type input_type,
                                         Primitive::Type result_type,
                                         uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegB(), input_type);
  AppendInstruction(new (arena_) HTypeConversion(result_type, first, dex_pc));
  UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
}

template<typename T>
void HInstructionBuilder::Binop_23x(const Instruction& instruction,
                                    Primitive::Type type,
                                    uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegB(), type);
  HInstruction* second = LoadLocal(instruction.VRegC(), type);
  AppendInstruction(new (arena_) T(type, first, second, dex_pc));
  UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
}

template<typename T>
void HInstructionBuilder::Binop_23x_shift(const Instruction& instruction,
                                          Primitive::Type type,
                                          uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegB(), type);
  HInstruction* second = LoadLocal(instruction.VRegC(), Primitive::kPrimInt);
  AppendInstruction(new (arena_) T(type, first, second, dex_pc));
  UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
}

void HInstructionBuilder::Binop_23x_cmp(const Instruction& instruction,
                                        Primitive::Type type,
                                        ComparisonBias bias,
                                        uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegB(), type);
  HInstruction* second = LoadLocal(instruction.VRegC(), type);
  AppendInstruction(new (arena_) HCompare(type, first, second, bias, dex_pc));
  UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
}

template<typename T>
void HInstructionBuilder::Binop_12x_shift(const Instruction& instruction,
                                          Primitive::Type type,
                                          uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegA(), type);
  HInstruction* second = LoadLocal(instruction.VRegB(), Primitive::kPrimInt);
  AppendInstruction(new (arena_) T(type, first, second, dex_pc));
  UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
}

template<typename T>
void HInstructionBuilder::Binop_12x(const Instruction& instruction,
                                    Primitive::Type type,
                                    uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegA(), type);
  HInstruction* second = LoadLocal(instruction.VRegB(), type);
  AppendInstruction(new (arena_) T(type, first, second, dex_pc));
  UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
}

template<typename T>
void HInstructionBuilder::Binop_22s(const Instruction& instruction, bool reverse, uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegB(), Primitive::kPrimInt);
  HInstruction* second = graph_->GetIntConstant(instruction.VRegC_22s(), dex_pc);
  if (reverse) {
    std::swap(first, second);
  }
  AppendInstruction(new (arena_) T(Primitive::kPrimInt, first, second, dex_pc));
  UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
}

template<typename T>
void HInstructionBuilder::Binop_22b(const Instruction& instruction, bool reverse, uint32_t dex_pc) {
  HInstruction* first = LoadLocal(instruction.VRegB(), Primitive::kPrimInt);
  HInstruction* second = graph_->GetIntConstant(instruction.VRegC_22b(), dex_pc);
  if (reverse) {
    std::swap(first, second);
  }
  AppendInstruction(new (arena_) T(Primitive::kPrimInt, first, second, dex_pc));
  UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
}

// Does the method being compiled need any constructor barriers being inserted?
// (Always 'false' for methods that aren't <init>.)
static bool RequiresConstructorBarrier(const DexCompilationUnit* cu, CompilerDriver* driver) {
  // Can be null in unit tests only.
  if (UNLIKELY(cu == nullptr)) {
    return false;
  }

  Thread* self = Thread::Current();
  return cu->IsConstructor()
      && !cu->IsStatic()
      // RequiresConstructorBarrier must only be queried for <init> methods;
      // it's effectively "false" for every other method.
      //
      // See CompilerDriver::RequiresConstructBarrier for more explanation.
      && driver->RequiresConstructorBarrier(self, cu->GetDexFile(), cu->GetClassDefIndex());
}

// Returns true if `block` has only one successor which starts at the next
// dex_pc after `instruction` at `dex_pc`.
static bool IsFallthroughInstruction(const Instruction& instruction,
                                     uint32_t dex_pc,
                                     HBasicBlock* block) {
  uint32_t next_dex_pc = dex_pc + instruction.SizeInCodeUnits();
  return block->GetSingleSuccessor()->GetDexPc() == next_dex_pc;
}

void HInstructionBuilder::BuildSwitch(const Instruction& instruction, uint32_t dex_pc) {
  HInstruction* value = LoadLocal(instruction.VRegA(), Primitive::kPrimInt);
  DexSwitchTable table(instruction, dex_pc);

  if (table.GetNumEntries() == 0) {
    // Empty Switch. Code falls through to the next block.
    DCHECK(IsFallthroughInstruction(instruction, dex_pc, current_block_));
    AppendInstruction(new (arena_) HGoto(dex_pc));
  } else if (table.ShouldBuildDecisionTree()) {
    for (DexSwitchTableIterator it(table); !it.Done(); it.Advance()) {
      HInstruction* case_value = graph_->GetIntConstant(it.CurrentKey(), dex_pc);
      HEqual* comparison = new (arena_) HEqual(value, case_value, dex_pc);
      AppendInstruction(comparison);
      AppendInstruction(new (arena_) HIf(comparison, dex_pc));

      if (!it.IsLast()) {
        current_block_ = FindBlockStartingAt(it.GetDexPcForCurrentIndex());
      }
    }
  } else {
    AppendInstruction(
        new (arena_) HPackedSwitch(table.GetEntryAt(0), table.GetNumEntries(), value, dex_pc));
  }

  current_block_ = nullptr;
}

void HInstructionBuilder::BuildReturn(const Instruction& instruction,
                                      Primitive::Type type,
                                      uint32_t dex_pc) {
  if (type == Primitive::kPrimVoid) {
    // Only <init> (which is a return-void) could possibly have a constructor fence.
    // This may insert additional redundant constructor fences from the super constructors.
    // TODO: remove redundant constructor fences (b/36656456).
    if (RequiresConstructorBarrier(dex_compilation_unit_, compiler_driver_)) {
      // Compiling instance constructor.
      DCHECK_STREQ("<init>", graph_->GetMethodName());

      HInstruction* fence_target = current_this_parameter_;
      DCHECK(fence_target != nullptr);

      AppendInstruction(new (arena_) HConstructorFence(fence_target, dex_pc, arena_));
    }
    AppendInstruction(new (arena_) HReturnVoid(dex_pc));
  } else {
    DCHECK(!RequiresConstructorBarrier(dex_compilation_unit_, compiler_driver_));
    HInstruction* value = LoadLocal(instruction.VRegA(), type);
    AppendInstruction(new (arena_) HReturn(value, dex_pc));
  }
  current_block_ = nullptr;
}

static InvokeType GetInvokeTypeFromOpCode(Instruction::Code opcode) {
  switch (opcode) {
    case Instruction::INVOKE_STATIC:
    case Instruction::INVOKE_STATIC_RANGE:
      return kStatic;
    case Instruction::INVOKE_DIRECT:
    case Instruction::INVOKE_DIRECT_RANGE:
      return kDirect;
    case Instruction::INVOKE_VIRTUAL:
    case Instruction::INVOKE_VIRTUAL_QUICK:
    case Instruction::INVOKE_VIRTUAL_RANGE:
    case Instruction::INVOKE_VIRTUAL_RANGE_QUICK:
      return kVirtual;
    case Instruction::INVOKE_INTERFACE:
    case Instruction::INVOKE_INTERFACE_RANGE:
      return kInterface;
    case Instruction::INVOKE_SUPER_RANGE:
    case Instruction::INVOKE_SUPER:
      return kSuper;
    default:
      LOG(FATAL) << "Unexpected invoke opcode: " << opcode;
      UNREACHABLE();
  }
}

ArtMethod* HInstructionBuilder::ResolveMethod(uint16_t method_idx, InvokeType invoke_type) {
  ScopedObjectAccess soa(Thread::Current());

  ClassLinker* class_linker = dex_compilation_unit_->GetClassLinker();
  Handle<mirror::ClassLoader> class_loader = dex_compilation_unit_->GetClassLoader();

  ArtMethod* resolved_method =
      class_linker->ResolveMethod<ClassLinker::ResolveMode::kCheckICCEAndIAE>(
          *dex_compilation_unit_->GetDexFile(),
          method_idx,
          dex_compilation_unit_->GetDexCache(),
          class_loader,
          graph_->GetArtMethod(),
          invoke_type);

  if (UNLIKELY(resolved_method == nullptr)) {
    // Clean up any exception left by type resolution.
    soa.Self()->ClearException();
    return nullptr;
  }

  // The referrer may be unresolved for AOT if we're compiling a class that cannot be
  // resolved because, for example, we don't find a superclass in the classpath.
  if (graph_->GetArtMethod() == nullptr) {
    // The class linker cannot check access without a referrer, so we have to do it.
    // Fall back to HInvokeUnresolved if the method isn't public.
    if (!resolved_method->IsPublic()) {
      return nullptr;
    }
  }

  // We have to special case the invoke-super case, as ClassLinker::ResolveMethod does not.
  // We need to look at the referrer's super class vtable. We need to do this to know if we need to
  // make this an invoke-unresolved to handle cross-dex invokes or abstract super methods, both of
  // which require runtime handling.
  if (invoke_type == kSuper) {
    ObjPtr<mirror::Class> compiling_class = GetCompilingClass();
    if (compiling_class == nullptr) {
      // We could not determine the method's class we need to wait until runtime.
      DCHECK(Runtime::Current()->IsAotCompiler());
      return nullptr;
    }
    ObjPtr<mirror::Class> referenced_class = class_linker->LookupResolvedType(
        *dex_compilation_unit_->GetDexFile(),
        dex_compilation_unit_->GetDexFile()->GetMethodId(method_idx).class_idx_,
        dex_compilation_unit_->GetDexCache().Get(),
        class_loader.Get());
    DCHECK(referenced_class != nullptr);  // We have already resolved a method from this class.
    if (!referenced_class->IsAssignableFrom(compiling_class)) {
      // We cannot statically determine the target method. The runtime will throw a
      // NoSuchMethodError on this one.
      return nullptr;
    }
    ArtMethod* actual_method;
    if (referenced_class->IsInterface()) {
      actual_method = referenced_class->FindVirtualMethodForInterfaceSuper(
          resolved_method, class_linker->GetImagePointerSize());
    } else {
      uint16_t vtable_index = resolved_method->GetMethodIndex();
      actual_method = compiling_class->GetSuperClass()->GetVTableEntry(
          vtable_index, class_linker->GetImagePointerSize());
    }
    if (actual_method != resolved_method &&
        !IsSameDexFile(*actual_method->GetDexFile(), *dex_compilation_unit_->GetDexFile())) {
      // The back-end code generator relies on this check in order to ensure that it will not
      // attempt to read the dex_cache with a dex_method_index that is not from the correct
      // dex_file. If we didn't do this check then the dex_method_index will not be updated in the
      // builder, which means that the code-generator (and compiler driver during sharpening and
      // inliner, maybe) might invoke an incorrect method.
      // TODO: The actual method could still be referenced in the current dex file, so we
      //       could try locating it.
      // TODO: Remove the dex_file restriction.
      return nullptr;
    }
    if (!actual_method->IsInvokable()) {
      // Fail if the actual method cannot be invoked. Otherwise, the runtime resolution stub
      // could resolve the callee to the wrong method.
      return nullptr;
    }
    resolved_method = actual_method;
  }

  return resolved_method;
}

static bool IsStringConstructor(ArtMethod* method) {
  ScopedObjectAccess soa(Thread::Current());
  return method->GetDeclaringClass()->IsStringClass() && method->IsConstructor();
}

bool HInstructionBuilder::BuildInvoke(const Instruction& instruction,
                                      uint32_t dex_pc,
                                      uint32_t method_idx,
                                      uint32_t number_of_vreg_arguments,
                                      bool is_range,
                                      uint32_t* args,
                                      uint32_t register_index) {
  InvokeType invoke_type = GetInvokeTypeFromOpCode(instruction.Opcode());
  const char* descriptor = dex_file_->GetMethodShorty(method_idx);
  Primitive::Type return_type = Primitive::GetType(descriptor[0]);

  // Remove the return type from the 'proto'.
  size_t number_of_arguments = strlen(descriptor) - 1;
  if (invoke_type != kStatic) {  // instance call
    // One extra argument for 'this'.
    number_of_arguments++;
  }

  ArtMethod* resolved_method = ResolveMethod(method_idx, invoke_type);

  if (UNLIKELY(resolved_method == nullptr)) {
    MaybeRecordStat(compilation_stats_,
                    MethodCompilationStat::kUnresolvedMethod);
    HInvoke* invoke = new (arena_) HInvokeUnresolved(arena_,
                                                     number_of_arguments,
                                                     return_type,
                                                     dex_pc,
                                                     method_idx,
                                                     invoke_type);
    return HandleInvoke(invoke,
                        number_of_vreg_arguments,
                        args,
                        register_index,
                        is_range,
                        descriptor,
                        nullptr, /* clinit_check */
                        true /* is_unresolved */);
  }

  // Replace calls to String.<init> with StringFactory.
  if (IsStringConstructor(resolved_method)) {
    uint32_t string_init_entry_point = WellKnownClasses::StringInitToEntryPoint(resolved_method);
    HInvokeStaticOrDirect::DispatchInfo dispatch_info = {
        HInvokeStaticOrDirect::MethodLoadKind::kStringInit,
        HInvokeStaticOrDirect::CodePtrLocation::kCallArtMethod,
        dchecked_integral_cast<uint64_t>(string_init_entry_point)
    };
    MethodReference target_method(dex_file_, method_idx);
    HInvoke* invoke = new (arena_) HInvokeStaticOrDirect(
        arena_,
        number_of_arguments - 1,
        Primitive::kPrimNot /*return_type */,
        dex_pc,
        method_idx,
        nullptr,
        dispatch_info,
        invoke_type,
        target_method,
        HInvokeStaticOrDirect::ClinitCheckRequirement::kImplicit);
    return HandleStringInit(invoke,
                            number_of_vreg_arguments,
                            args,
                            register_index,
                            is_range,
                            descriptor);
  }

  // Potential class initialization check, in the case of a static method call.
  HClinitCheck* clinit_check = nullptr;
  HInvoke* invoke = nullptr;
  if (invoke_type == kDirect || invoke_type == kStatic || invoke_type == kSuper) {
    // By default, consider that the called method implicitly requires
    // an initialization check of its declaring method.
    HInvokeStaticOrDirect::ClinitCheckRequirement clinit_check_requirement
        = HInvokeStaticOrDirect::ClinitCheckRequirement::kImplicit;
    ScopedObjectAccess soa(Thread::Current());
    if (invoke_type == kStatic) {
      clinit_check = ProcessClinitCheckForInvoke(
          dex_pc, resolved_method, &clinit_check_requirement);
    } else if (invoke_type == kSuper) {
      if (IsSameDexFile(*resolved_method->GetDexFile(), *dex_compilation_unit_->GetDexFile())) {
        // Update the method index to the one resolved. Note that this may be a no-op if
        // we resolved to the method referenced by the instruction.
        method_idx = resolved_method->GetDexMethodIndex();
      }
    }

    HInvokeStaticOrDirect::DispatchInfo dispatch_info = {
        HInvokeStaticOrDirect::MethodLoadKind::kRuntimeCall,
        HInvokeStaticOrDirect::CodePtrLocation::kCallArtMethod,
        0u
    };
    MethodReference target_method(resolved_method->GetDexFile(),
                                  resolved_method->GetDexMethodIndex());
    invoke = new (arena_) HInvokeStaticOrDirect(arena_,
                                                number_of_arguments,
                                                return_type,
                                                dex_pc,
                                                method_idx,
                                                resolved_method,
                                                dispatch_info,
                                                invoke_type,
                                                target_method,
                                                clinit_check_requirement);
  } else if (invoke_type == kVirtual) {
    ScopedObjectAccess soa(Thread::Current());  // Needed for the method index
    invoke = new (arena_) HInvokeVirtual(arena_,
                                         number_of_arguments,
                                         return_type,
                                         dex_pc,
                                         method_idx,
                                         resolved_method,
                                         resolved_method->GetMethodIndex());
  } else {
    DCHECK_EQ(invoke_type, kInterface);
    ScopedObjectAccess soa(Thread::Current());  // Needed for the IMT index.
    invoke = new (arena_) HInvokeInterface(arena_,
                                           number_of_arguments,
                                           return_type,
                                           dex_pc,
                                           method_idx,
                                           resolved_method,
                                           ImTable::GetImtIndex(resolved_method));
  }

  return HandleInvoke(invoke,
                      number_of_vreg_arguments,
                      args,
                      register_index,
                      is_range,
                      descriptor,
                      clinit_check,
                      false /* is_unresolved */);
}

bool HInstructionBuilder::BuildInvokePolymorphic(const Instruction& instruction ATTRIBUTE_UNUSED,
                                                 uint32_t dex_pc,
                                                 uint32_t method_idx,
                                                 uint32_t proto_idx,
                                                 uint32_t number_of_vreg_arguments,
                                                 bool is_range,
                                                 uint32_t* args,
                                                 uint32_t register_index) {
  const char* descriptor = dex_file_->GetShorty(proto_idx);
  DCHECK_EQ(1 + ArtMethod::NumArgRegisters(descriptor), number_of_vreg_arguments);
  Primitive::Type return_type = Primitive::GetType(descriptor[0]);
  size_t number_of_arguments = strlen(descriptor);
  HInvoke* invoke = new (arena_) HInvokePolymorphic(arena_,
                                                    number_of_arguments,
                                                    return_type,
                                                    dex_pc,
                                                    method_idx);
  return HandleInvoke(invoke,
                      number_of_vreg_arguments,
                      args,
                      register_index,
                      is_range,
                      descriptor,
                      nullptr /* clinit_check */,
                      false /* is_unresolved */);
}

HNewInstance* HInstructionBuilder::BuildNewInstance(dex::TypeIndex type_index, uint32_t dex_pc) {
  ScopedObjectAccess soa(Thread::Current());

  HLoadClass* load_class = BuildLoadClass(type_index, dex_pc);

  HInstruction* cls = load_class;
  Handle<mirror::Class> klass = load_class->GetClass();

  if (!IsInitialized(klass)) {
    cls = new (arena_) HClinitCheck(load_class, dex_pc);
    AppendInstruction(cls);
  }

  // Only the access check entrypoint handles the finalizable class case. If we
  // need access checks, then we haven't resolved the method and the class may
  // again be finalizable.
  QuickEntrypointEnum entrypoint = kQuickAllocObjectInitialized;
  if (load_class->NeedsAccessCheck() || klass->IsFinalizable() || !klass->IsInstantiable()) {
    entrypoint = kQuickAllocObjectWithChecks;
  }

  // Consider classes we haven't resolved as potentially finalizable.
  bool finalizable = (klass == nullptr) || klass->IsFinalizable();

  HNewInstance* new_instance = new (arena_) HNewInstance(
      cls,
      dex_pc,
      type_index,
      *dex_compilation_unit_->GetDexFile(),
      finalizable,
      entrypoint);
  AppendInstruction(new_instance);

  return new_instance;
}

void HInstructionBuilder::BuildConstructorFenceForAllocation(HInstruction* allocation) {
  DCHECK(allocation != nullptr &&
             (allocation->IsNewInstance() ||
              allocation->IsNewArray()));  // corresponding to "new" keyword in JLS.

  if (allocation->IsNewInstance()) {
    // STRING SPECIAL HANDLING:
    // -------------------------------
    // Strings have a real HNewInstance node but they end up always having 0 uses.
    // All uses of a String HNewInstance are always transformed to replace their input
    // of the HNewInstance with an input of the invoke to StringFactory.
    //
    // Do not emit an HConstructorFence here since it can inhibit some String new-instance
    // optimizations (to pass checker tests that rely on those optimizations).
    HNewInstance* new_inst = allocation->AsNewInstance();
    HLoadClass* load_class = new_inst->GetLoadClass();

    Thread* self = Thread::Current();
    ScopedObjectAccess soa(self);
    StackHandleScope<1> hs(self);
    Handle<mirror::Class> klass = load_class->GetClass();
    if (klass != nullptr && klass->IsStringClass()) {
      return;
      // Note: Do not use allocation->IsStringAlloc which requires
      // a valid ReferenceTypeInfo, but that doesn't get made until after reference type
      // propagation (and instruction builder is too early).
    }
    // (In terms of correctness, the StringFactory needs to provide its own
    // default initialization barrier, see below.)
  }

  // JLS 17.4.5 "Happens-before Order" describes:
  //
  //   The default initialization of any object happens-before any other actions (other than
  //   default-writes) of a program.
  //
  // In our implementation the default initialization of an object to type T means
  // setting all of its initial data (object[0..size)) to 0, and setting the
  // object's class header (i.e. object.getClass() == T.class).
  //
  // In practice this fence ensures that the writes to the object header
  // are visible to other threads if this object escapes the current thread.
  // (and in theory the 0-initializing, but that happens automatically
  // when new memory pages are mapped in by the OS).
  HConstructorFence* ctor_fence =
      new (arena_) HConstructorFence(allocation, allocation->GetDexPc(), arena_);
  AppendInstruction(ctor_fence);
}

static bool IsSubClass(mirror::Class* to_test, mirror::Class* super_class)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  return to_test != nullptr && !to_test->IsInterface() && to_test->IsSubClass(super_class);
}

bool HInstructionBuilder::IsInitialized(Handle<mirror::Class> cls) const {
  if (cls == nullptr) {
    return false;
  }

  // `CanAssumeClassIsLoaded` will return true if we're JITting, or will
  // check whether the class is in an image for the AOT compilation.
  if (cls->IsInitialized() &&
      compiler_driver_->CanAssumeClassIsLoaded(cls.Get())) {
    return true;
  }

  if (IsSubClass(GetOutermostCompilingClass(), cls.Get())) {
    return true;
  }

  // TODO: We should walk over the inlined methods, but we don't pass
  //       that information to the builder.
  if (IsSubClass(GetCompilingClass(), cls.Get())) {
    return true;
  }

  return false;
}

HClinitCheck* HInstructionBuilder::ProcessClinitCheckForInvoke(
      uint32_t dex_pc,
      ArtMethod* resolved_method,
      HInvokeStaticOrDirect::ClinitCheckRequirement* clinit_check_requirement) {
  Handle<mirror::Class> klass = handles_->NewHandle(resolved_method->GetDeclaringClass());

  HClinitCheck* clinit_check = nullptr;
  if (IsInitialized(klass)) {
    *clinit_check_requirement = HInvokeStaticOrDirect::ClinitCheckRequirement::kNone;
  } else {
    HLoadClass* cls = BuildLoadClass(klass->GetDexTypeIndex(),
                                     klass->GetDexFile(),
                                     klass,
                                     dex_pc,
                                     /* needs_access_check */ false);
    if (cls != nullptr) {
      *clinit_check_requirement = HInvokeStaticOrDirect::ClinitCheckRequirement::kExplicit;
      clinit_check = new (arena_) HClinitCheck(cls, dex_pc);
      AppendInstruction(clinit_check);
    }
  }
  return clinit_check;
}

bool HInstructionBuilder::SetupInvokeArguments(HInvoke* invoke,
                                               uint32_t number_of_vreg_arguments,
                                               uint32_t* args,
                                               uint32_t register_index,
                                               bool is_range,
                                               const char* descriptor,
                                               size_t start_index,
                                               size_t* argument_index) {
  uint32_t descriptor_index = 1;  // Skip the return type.

  for (size_t i = start_index;
       // Make sure we don't go over the expected arguments or over the number of
       // dex registers given. If the instruction was seen as dead by the verifier,
       // it hasn't been properly checked.
       (i < number_of_vreg_arguments) && (*argument_index < invoke->GetNumberOfArguments());
       i++, (*argument_index)++) {
    Primitive::Type type = Primitive::GetType(descriptor[descriptor_index++]);
    bool is_wide = (type == Primitive::kPrimLong) || (type == Primitive::kPrimDouble);
    if (!is_range
        && is_wide
        && ((i + 1 == number_of_vreg_arguments) || (args[i] + 1 != args[i + 1]))) {
      // Longs and doubles should be in pairs, that is, sequential registers. The verifier should
      // reject any class where this is violated. However, the verifier only does these checks
      // on non trivially dead instructions, so we just bailout the compilation.
      VLOG(compiler) << "Did not compile "
                     << dex_file_->PrettyMethod(dex_compilation_unit_->GetDexMethodIndex())
                     << " because of non-sequential dex register pair in wide argument";
      MaybeRecordStat(compilation_stats_,
                      MethodCompilationStat::kNotCompiledMalformedOpcode);
      return false;
    }
    HInstruction* arg = LoadLocal(is_range ? register_index + i : args[i], type);
    invoke->SetArgumentAt(*argument_index, arg);
    if (is_wide) {
      i++;
    }
  }

  if (*argument_index != invoke->GetNumberOfArguments()) {
    VLOG(compiler) << "Did not compile "
                   << dex_file_->PrettyMethod(dex_compilation_unit_->GetDexMethodIndex())
                   << " because of wrong number of arguments in invoke instruction";
    MaybeRecordStat(compilation_stats_,
                    MethodCompilationStat::kNotCompiledMalformedOpcode);
    return false;
  }

  if (invoke->IsInvokeStaticOrDirect() &&
      HInvokeStaticOrDirect::NeedsCurrentMethodInput(
          invoke->AsInvokeStaticOrDirect()->GetMethodLoadKind())) {
    invoke->SetArgumentAt(*argument_index, graph_->GetCurrentMethod());
    (*argument_index)++;
  }

  return true;
}

bool HInstructionBuilder::HandleInvoke(HInvoke* invoke,
                                       uint32_t number_of_vreg_arguments,
                                       uint32_t* args,
                                       uint32_t register_index,
                                       bool is_range,
                                       const char* descriptor,
                                       HClinitCheck* clinit_check,
                                       bool is_unresolved) {
  DCHECK(!invoke->IsInvokeStaticOrDirect() || !invoke->AsInvokeStaticOrDirect()->IsStringInit());

  size_t start_index = 0;
  size_t argument_index = 0;
  if (invoke->GetInvokeType() != InvokeType::kStatic) {  // Instance call.
    uint32_t obj_reg = is_range ? register_index : args[0];
    HInstruction* arg = is_unresolved
        ? LoadLocal(obj_reg, Primitive::kPrimNot)
        : LoadNullCheckedLocal(obj_reg, invoke->GetDexPc());
    invoke->SetArgumentAt(0, arg);
    start_index = 1;
    argument_index = 1;
  }

  if (!SetupInvokeArguments(invoke,
                            number_of_vreg_arguments,
                            args,
                            register_index,
                            is_range,
                            descriptor,
                            start_index,
                            &argument_index)) {
    return false;
  }

  if (clinit_check != nullptr) {
    // Add the class initialization check as last input of `invoke`.
    DCHECK(invoke->IsInvokeStaticOrDirect());
    DCHECK(invoke->AsInvokeStaticOrDirect()->GetClinitCheckRequirement()
        == HInvokeStaticOrDirect::ClinitCheckRequirement::kExplicit);
    invoke->SetArgumentAt(argument_index, clinit_check);
    argument_index++;
  }

  AppendInstruction(invoke);
  latest_result_ = invoke;

  return true;
}

bool HInstructionBuilder::HandleStringInit(HInvoke* invoke,
                                           uint32_t number_of_vreg_arguments,
                                           uint32_t* args,
                                           uint32_t register_index,
                                           bool is_range,
                                           const char* descriptor) {
  DCHECK(invoke->IsInvokeStaticOrDirect());
  DCHECK(invoke->AsInvokeStaticOrDirect()->IsStringInit());

  size_t start_index = 1;
  size_t argument_index = 0;
  if (!SetupInvokeArguments(invoke,
                            number_of_vreg_arguments,
                            args,
                            register_index,
                            is_range,
                            descriptor,
                            start_index,
                            &argument_index)) {
    return false;
  }

  AppendInstruction(invoke);

  // This is a StringFactory call, not an actual String constructor. Its result
  // replaces the empty String pre-allocated by NewInstance.
  uint32_t orig_this_reg = is_range ? register_index : args[0];
  HInstruction* arg_this = LoadLocal(orig_this_reg, Primitive::kPrimNot);

  // Replacing the NewInstance might render it redundant. Keep a list of these
  // to be visited once it is clear whether it is has remaining uses.
  if (arg_this->IsNewInstance()) {
    ssa_builder_->AddUninitializedString(arg_this->AsNewInstance());
  } else {
    DCHECK(arg_this->IsPhi());
    // NewInstance is not the direct input of the StringFactory call. It might
    // be redundant but optimizing this case is not worth the effort.
  }

  // Walk over all vregs and replace any occurrence of `arg_this` with `invoke`.
  for (size_t vreg = 0, e = current_locals_->size(); vreg < e; ++vreg) {
    if ((*current_locals_)[vreg] == arg_this) {
      (*current_locals_)[vreg] = invoke;
    }
  }

  return true;
}

static Primitive::Type GetFieldAccessType(const DexFile& dex_file, uint16_t field_index) {
  const DexFile::FieldId& field_id = dex_file.GetFieldId(field_index);
  const char* type = dex_file.GetFieldTypeDescriptor(field_id);
  return Primitive::GetType(type[0]);
}

bool HInstructionBuilder::BuildInstanceFieldAccess(const Instruction& instruction,
                                                   uint32_t dex_pc,
                                                   bool is_put,
                                                   size_t quicken_index) {
  uint32_t source_or_dest_reg = instruction.VRegA_22c();
  uint32_t obj_reg = instruction.VRegB_22c();
  uint16_t field_index;
  if (instruction.IsQuickened()) {
    if (!CanDecodeQuickenedInfo()) {
      return false;
    }
    field_index = LookupQuickenedInfo(quicken_index);
  } else {
    field_index = instruction.VRegC_22c();
  }

  ScopedObjectAccess soa(Thread::Current());
  ArtField* resolved_field = ResolveField(field_index, /* is_static */ false, is_put);

  // Generate an explicit null check on the reference, unless the field access
  // is unresolved. In that case, we rely on the runtime to perform various
  // checks first, followed by a null check.
  HInstruction* object = (resolved_field == nullptr)
      ? LoadLocal(obj_reg, Primitive::kPrimNot)
      : LoadNullCheckedLocal(obj_reg, dex_pc);

  Primitive::Type field_type = (resolved_field == nullptr)
      ? GetFieldAccessType(*dex_file_, field_index)
      : resolved_field->GetTypeAsPrimitiveType();
  if (is_put) {
    HInstruction* value = LoadLocal(source_or_dest_reg, field_type);
    HInstruction* field_set = nullptr;
    if (resolved_field == nullptr) {
      MaybeRecordStat(compilation_stats_,
                      MethodCompilationStat::kUnresolvedField);
      field_set = new (arena_) HUnresolvedInstanceFieldSet(object,
                                                           value,
                                                           field_type,
                                                           field_index,
                                                           dex_pc);
    } else {
      uint16_t class_def_index = resolved_field->GetDeclaringClass()->GetDexClassDefIndex();
      field_set = new (arena_) HInstanceFieldSet(object,
                                                 value,
                                                 resolved_field,
                                                 field_type,
                                                 resolved_field->GetOffset(),
                                                 resolved_field->IsVolatile(),
                                                 field_index,
                                                 class_def_index,
                                                 *dex_file_,
                                                 dex_pc);
    }
    AppendInstruction(field_set);
  } else {
    HInstruction* field_get = nullptr;
    if (resolved_field == nullptr) {
      MaybeRecordStat(compilation_stats_,
                      MethodCompilationStat::kUnresolvedField);
      field_get = new (arena_) HUnresolvedInstanceFieldGet(object,
                                                           field_type,
                                                           field_index,
                                                           dex_pc);
    } else {
      uint16_t class_def_index = resolved_field->GetDeclaringClass()->GetDexClassDefIndex();
      field_get = new (arena_) HInstanceFieldGet(object,
                                                 resolved_field,
                                                 field_type,
                                                 resolved_field->GetOffset(),
                                                 resolved_field->IsVolatile(),
                                                 field_index,
                                                 class_def_index,
                                                 *dex_file_,
                                                 dex_pc);
    }
    AppendInstruction(field_get);
    UpdateLocal(source_or_dest_reg, field_get);
  }

  return true;
}

static mirror::Class* GetClassFrom(CompilerDriver* driver,
                                   const DexCompilationUnit& compilation_unit) {
  ScopedObjectAccess soa(Thread::Current());
  Handle<mirror::ClassLoader> class_loader = compilation_unit.GetClassLoader();
  Handle<mirror::DexCache> dex_cache = compilation_unit.GetDexCache();

  return driver->ResolveCompilingMethodsClass(soa, dex_cache, class_loader, &compilation_unit);
}

mirror::Class* HInstructionBuilder::GetOutermostCompilingClass() const {
  return GetClassFrom(compiler_driver_, *outer_compilation_unit_);
}

mirror::Class* HInstructionBuilder::GetCompilingClass() const {
  return GetClassFrom(compiler_driver_, *dex_compilation_unit_);
}

bool HInstructionBuilder::IsOutermostCompilingClass(dex::TypeIndex type_index) const {
  ScopedObjectAccess soa(Thread::Current());
  StackHandleScope<2> hs(soa.Self());
  Handle<mirror::DexCache> dex_cache = dex_compilation_unit_->GetDexCache();
  Handle<mirror::ClassLoader> class_loader = dex_compilation_unit_->GetClassLoader();
  Handle<mirror::Class> cls(hs.NewHandle(compiler_driver_->ResolveClass(
      soa, dex_cache, class_loader, type_index, dex_compilation_unit_)));
  Handle<mirror::Class> outer_class(hs.NewHandle(GetOutermostCompilingClass()));

  // GetOutermostCompilingClass returns null when the class is unresolved
  // (e.g. if it derives from an unresolved class). This is bogus knowing that
  // we are compiling it.
  // When this happens we cannot establish a direct relation between the current
  // class and the outer class, so we return false.
  // (Note that this is only used for optimizing invokes and field accesses)
  return (cls != nullptr) && (outer_class.Get() == cls.Get());
}

void HInstructionBuilder::BuildUnresolvedStaticFieldAccess(const Instruction& instruction,
                                                           uint32_t dex_pc,
                                                           bool is_put,
                                                           Primitive::Type field_type) {
  uint32_t source_or_dest_reg = instruction.VRegA_21c();
  uint16_t field_index = instruction.VRegB_21c();

  if (is_put) {
    HInstruction* value = LoadLocal(source_or_dest_reg, field_type);
    AppendInstruction(
        new (arena_) HUnresolvedStaticFieldSet(value, field_type, field_index, dex_pc));
  } else {
    AppendInstruction(new (arena_) HUnresolvedStaticFieldGet(field_type, field_index, dex_pc));
    UpdateLocal(source_or_dest_reg, current_block_->GetLastInstruction());
  }
}

ArtField* HInstructionBuilder::ResolveField(uint16_t field_idx, bool is_static, bool is_put) {
  ScopedObjectAccess soa(Thread::Current());
  StackHandleScope<2> hs(soa.Self());

  ClassLinker* class_linker = dex_compilation_unit_->GetClassLinker();
  Handle<mirror::ClassLoader> class_loader = dex_compilation_unit_->GetClassLoader();
  Handle<mirror::Class> compiling_class(hs.NewHandle(GetCompilingClass()));

  ArtField* resolved_field = class_linker->ResolveField(*dex_compilation_unit_->GetDexFile(),
                                                        field_idx,
                                                        dex_compilation_unit_->GetDexCache(),
                                                        class_loader,
                                                        is_static);

  if (UNLIKELY(resolved_field == nullptr)) {
    // Clean up any exception left by type resolution.
    soa.Self()->ClearException();
    return nullptr;
  }

  // Check static/instance. The class linker has a fast path for looking into the dex cache
  // and does not check static/instance if it hits it.
  if (UNLIKELY(resolved_field->IsStatic() != is_static)) {
    return nullptr;
  }

  // Check access.
  if (compiling_class == nullptr) {
    if (!resolved_field->IsPublic()) {
      return nullptr;
    }
  } else if (!compiling_class->CanAccessResolvedField(resolved_field->GetDeclaringClass(),
                                                      resolved_field,
                                                      dex_compilation_unit_->GetDexCache().Get(),
                                                      field_idx)) {
    return nullptr;
  }

  if (is_put &&
      resolved_field->IsFinal() &&
      (compiling_class.Get() != resolved_field->GetDeclaringClass())) {
    // Final fields can only be updated within their own class.
    // TODO: Only allow it in constructors. b/34966607.
    return nullptr;
  }

  return resolved_field;
}

bool HInstructionBuilder::BuildStaticFieldAccess(const Instruction& instruction,
                                                 uint32_t dex_pc,
                                                 bool is_put) {
  uint32_t source_or_dest_reg = instruction.VRegA_21c();
  uint16_t field_index = instruction.VRegB_21c();

  ScopedObjectAccess soa(Thread::Current());
  ArtField* resolved_field = ResolveField(field_index, /* is_static */ true, is_put);

  if (resolved_field == nullptr) {
    MaybeRecordStat(compilation_stats_,
                    MethodCompilationStat::kUnresolvedField);
    Primitive::Type field_type = GetFieldAccessType(*dex_file_, field_index);
    BuildUnresolvedStaticFieldAccess(instruction, dex_pc, is_put, field_type);
    return true;
  }

  Primitive::Type field_type = resolved_field->GetTypeAsPrimitiveType();

  Handle<mirror::Class> klass = handles_->NewHandle(resolved_field->GetDeclaringClass());
  HLoadClass* constant = BuildLoadClass(klass->GetDexTypeIndex(),
                                        klass->GetDexFile(),
                                        klass,
                                        dex_pc,
                                        /* needs_access_check */ false);

  if (constant == nullptr) {
    // The class cannot be referenced from this compiled code. Generate
    // an unresolved access.
    MaybeRecordStat(compilation_stats_,
                    MethodCompilationStat::kUnresolvedFieldNotAFastAccess);
    BuildUnresolvedStaticFieldAccess(instruction, dex_pc, is_put, field_type);
    return true;
  }

  HInstruction* cls = constant;
  if (!IsInitialized(klass)) {
    cls = new (arena_) HClinitCheck(constant, dex_pc);
    AppendInstruction(cls);
  }

  uint16_t class_def_index = klass->GetDexClassDefIndex();
  if (is_put) {
    // We need to keep the class alive before loading the value.
    HInstruction* value = LoadLocal(source_or_dest_reg, field_type);
    DCHECK_EQ(HPhi::ToPhiType(value->GetType()), HPhi::ToPhiType(field_type));
    AppendInstruction(new (arena_) HStaticFieldSet(cls,
                                                   value,
                                                   resolved_field,
                                                   field_type,
                                                   resolved_field->GetOffset(),
                                                   resolved_field->IsVolatile(),
                                                   field_index,
                                                   class_def_index,
                                                   *dex_file_,
                                                   dex_pc));
  } else {
    AppendInstruction(new (arena_) HStaticFieldGet(cls,
                                                   resolved_field,
                                                   field_type,
                                                   resolved_field->GetOffset(),
                                                   resolved_field->IsVolatile(),
                                                   field_index,
                                                   class_def_index,
                                                   *dex_file_,
                                                   dex_pc));
    UpdateLocal(source_or_dest_reg, current_block_->GetLastInstruction());
  }
  return true;
}

void HInstructionBuilder::BuildCheckedDivRem(uint16_t out_vreg,
                                       uint16_t first_vreg,
                                       int64_t second_vreg_or_constant,
                                       uint32_t dex_pc,
                                       Primitive::Type type,
                                       bool second_is_constant,
                                       bool isDiv) {
  DCHECK(type == Primitive::kPrimInt || type == Primitive::kPrimLong);

  HInstruction* first = LoadLocal(first_vreg, type);
  HInstruction* second = nullptr;
  if (second_is_constant) {
    if (type == Primitive::kPrimInt) {
      second = graph_->GetIntConstant(second_vreg_or_constant, dex_pc);
    } else {
      second = graph_->GetLongConstant(second_vreg_or_constant, dex_pc);
    }
  } else {
    second = LoadLocal(second_vreg_or_constant, type);
  }

  if (!second_is_constant
      || (type == Primitive::kPrimInt && second->AsIntConstant()->GetValue() == 0)
      || (type == Primitive::kPrimLong && second->AsLongConstant()->GetValue() == 0)) {
    second = new (arena_) HDivZeroCheck(second, dex_pc);
    AppendInstruction(second);
  }

  if (isDiv) {
    AppendInstruction(new (arena_) HDiv(type, first, second, dex_pc));
  } else {
    AppendInstruction(new (arena_) HRem(type, first, second, dex_pc));
  }
  UpdateLocal(out_vreg, current_block_->GetLastInstruction());
}

void HInstructionBuilder::BuildArrayAccess(const Instruction& instruction,
                                           uint32_t dex_pc,
                                           bool is_put,
                                           Primitive::Type anticipated_type) {
  uint8_t source_or_dest_reg = instruction.VRegA_23x();
  uint8_t array_reg = instruction.VRegB_23x();
  uint8_t index_reg = instruction.VRegC_23x();

  HInstruction* object = LoadNullCheckedLocal(array_reg, dex_pc);
  HInstruction* length = new (arena_) HArrayLength(object, dex_pc);
  AppendInstruction(length);
  HInstruction* index = LoadLocal(index_reg, Primitive::kPrimInt);
  index = new (arena_) HBoundsCheck(index, length, dex_pc);
  AppendInstruction(index);
  if (is_put) {
    HInstruction* value = LoadLocal(source_or_dest_reg, anticipated_type);
    // TODO: Insert a type check node if the type is Object.
    HArraySet* aset = new (arena_) HArraySet(object, index, value, anticipated_type, dex_pc);
    ssa_builder_->MaybeAddAmbiguousArraySet(aset);
    AppendInstruction(aset);
  } else {
    HArrayGet* aget = new (arena_) HArrayGet(object, index, anticipated_type, dex_pc);
    ssa_builder_->MaybeAddAmbiguousArrayGet(aget);
    AppendInstruction(aget);
    UpdateLocal(source_or_dest_reg, current_block_->GetLastInstruction());
  }
  graph_->SetHasBoundsChecks(true);
}

HNewArray* HInstructionBuilder::BuildFilledNewArray(uint32_t dex_pc,
                                                    dex::TypeIndex type_index,
                                                    uint32_t number_of_vreg_arguments,
                                                    bool is_range,
                                                    uint32_t* args,
                                                    uint32_t register_index) {
  HInstruction* length = graph_->GetIntConstant(number_of_vreg_arguments, dex_pc);
  HLoadClass* cls = BuildLoadClass(type_index, dex_pc);
  HNewArray* const object = new (arena_) HNewArray(cls, length, dex_pc);
  AppendInstruction(object);

  const char* descriptor = dex_file_->StringByTypeIdx(type_index);
  DCHECK_EQ(descriptor[0], '[') << descriptor;
  char primitive = descriptor[1];
  DCHECK(primitive == 'I'
      || primitive == 'L'
      || primitive == '[') << descriptor;
  bool is_reference_array = (primitive == 'L') || (primitive == '[');
  Primitive::Type type = is_reference_array ? Primitive::kPrimNot : Primitive::kPrimInt;

  for (size_t i = 0; i < number_of_vreg_arguments; ++i) {
    HInstruction* value = LoadLocal(is_range ? register_index + i : args[i], type);
    HInstruction* index = graph_->GetIntConstant(i, dex_pc);
    HArraySet* aset = new (arena_) HArraySet(object, index, value, type, dex_pc);
    ssa_builder_->MaybeAddAmbiguousArraySet(aset);
    AppendInstruction(aset);
  }
  latest_result_ = object;

  return object;
}

template <typename T>
void HInstructionBuilder::BuildFillArrayData(HInstruction* object,
                                             const T* data,
                                             uint32_t element_count,
                                             Primitive::Type anticipated_type,
                                             uint32_t dex_pc) {
  for (uint32_t i = 0; i < element_count; ++i) {
    HInstruction* index = graph_->GetIntConstant(i, dex_pc);
    HInstruction* value = graph_->GetIntConstant(data[i], dex_pc);
    HArraySet* aset = new (arena_) HArraySet(object, index, value, anticipated_type, dex_pc);
    ssa_builder_->MaybeAddAmbiguousArraySet(aset);
    AppendInstruction(aset);
  }
}

void HInstructionBuilder::BuildFillArrayData(const Instruction& instruction, uint32_t dex_pc) {
  HInstruction* array = LoadNullCheckedLocal(instruction.VRegA_31t(), dex_pc);

  int32_t payload_offset = instruction.VRegB_31t() + dex_pc;
  const Instruction::ArrayDataPayload* payload =
      reinterpret_cast<const Instruction::ArrayDataPayload*>(code_item_.insns_ + payload_offset);
  const uint8_t* data = payload->data;
  uint32_t element_count = payload->element_count;

  if (element_count == 0u) {
    // For empty payload we emit only the null check above.
    return;
  }

  HInstruction* length = new (arena_) HArrayLength(array, dex_pc);
  AppendInstruction(length);

  // Implementation of this DEX instruction seems to be that the bounds check is
  // done before doing any stores.
  HInstruction* last_index = graph_->GetIntConstant(payload->element_count - 1, dex_pc);
  AppendInstruction(new (arena_) HBoundsCheck(last_index, length, dex_pc));

  switch (payload->element_width) {
    case 1:
      BuildFillArrayData(array,
                         reinterpret_cast<const int8_t*>(data),
                         element_count,
                         Primitive::kPrimByte,
                         dex_pc);
      break;
    case 2:
      BuildFillArrayData(array,
                         reinterpret_cast<const int16_t*>(data),
                         element_count,
                         Primitive::kPrimShort,
                         dex_pc);
      break;
    case 4:
      BuildFillArrayData(array,
                         reinterpret_cast<const int32_t*>(data),
                         element_count,
                         Primitive::kPrimInt,
                         dex_pc);
      break;
    case 8:
      BuildFillWideArrayData(array,
                             reinterpret_cast<const int64_t*>(data),
                             element_count,
                             dex_pc);
      break;
    default:
      LOG(FATAL) << "Unknown element width for " << payload->element_width;
  }
  graph_->SetHasBoundsChecks(true);
}

void HInstructionBuilder::BuildFillWideArrayData(HInstruction* object,
                                                 const int64_t* data,
                                                 uint32_t element_count,
                                                 uint32_t dex_pc) {
  for (uint32_t i = 0; i < element_count; ++i) {
    HInstruction* index = graph_->GetIntConstant(i, dex_pc);
    HInstruction* value = graph_->GetLongConstant(data[i], dex_pc);
    HArraySet* aset = new (arena_) HArraySet(object, index, value, Primitive::kPrimLong, dex_pc);
    ssa_builder_->MaybeAddAmbiguousArraySet(aset);
    AppendInstruction(aset);
  }
}

static TypeCheckKind ComputeTypeCheckKind(Handle<mirror::Class> cls)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  if (cls == nullptr) {
    return TypeCheckKind::kUnresolvedCheck;
  } else if (cls->IsInterface()) {
    return TypeCheckKind::kInterfaceCheck;
  } else if (cls->IsArrayClass()) {
    if (cls->GetComponentType()->IsObjectClass()) {
      return TypeCheckKind::kArrayObjectCheck;
    } else if (cls->CannotBeAssignedFromOtherTypes()) {
      return TypeCheckKind::kExactCheck;
    } else {
      return TypeCheckKind::kArrayCheck;
    }
  } else if (cls->IsFinal()) {
    return TypeCheckKind::kExactCheck;
  } else if (cls->IsAbstract()) {
    return TypeCheckKind::kAbstractClassCheck;
  } else {
    return TypeCheckKind::kClassHierarchyCheck;
  }
}

HLoadClass* HInstructionBuilder::BuildLoadClass(dex::TypeIndex type_index, uint32_t dex_pc) {
  ScopedObjectAccess soa(Thread::Current());
  const DexFile& dex_file = *dex_compilation_unit_->GetDexFile();
  Handle<mirror::ClassLoader> class_loader = dex_compilation_unit_->GetClassLoader();
  Handle<mirror::Class> klass = handles_->NewHandle(compiler_driver_->ResolveClass(
      soa, dex_compilation_unit_->GetDexCache(), class_loader, type_index, dex_compilation_unit_));

  bool needs_access_check = true;
  if (klass != nullptr) {
    if (klass->IsPublic()) {
      needs_access_check = false;
    } else {
      mirror::Class* compiling_class = GetCompilingClass();
      if (compiling_class != nullptr && compiling_class->CanAccess(klass.Get())) {
        needs_access_check = false;
      }
    }
  }

  return BuildLoadClass(type_index, dex_file, klass, dex_pc, needs_access_check);
}

HLoadClass* HInstructionBuilder::BuildLoadClass(dex::TypeIndex type_index,
                                                const DexFile& dex_file,
                                                Handle<mirror::Class> klass,
                                                uint32_t dex_pc,
                                                bool needs_access_check) {
  // Try to find a reference in the compiling dex file.
  const DexFile* actual_dex_file = &dex_file;
  if (!IsSameDexFile(dex_file, *dex_compilation_unit_->GetDexFile())) {
    dex::TypeIndex local_type_index =
        klass->FindTypeIndexInOtherDexFile(*dex_compilation_unit_->GetDexFile());
    if (local_type_index.IsValid()) {
      type_index = local_type_index;
      actual_dex_file = dex_compilation_unit_->GetDexFile();
    }
  }

  // Note: `klass` must be from `handles_`.
  HLoadClass* load_class = new (arena_) HLoadClass(
      graph_->GetCurrentMethod(),
      type_index,
      *actual_dex_file,
      klass,
      klass != nullptr && (klass.Get() == GetOutermostCompilingClass()),
      dex_pc,
      needs_access_check);

  HLoadClass::LoadKind load_kind = HSharpening::ComputeLoadClassKind(load_class,
                                                                     code_generator_,
                                                                     compiler_driver_,
                                                                     *dex_compilation_unit_);

  if (load_kind == HLoadClass::LoadKind::kInvalid) {
    // We actually cannot reference this class, we're forced to bail.
    return nullptr;
  }
  // Append the instruction first, as setting the load kind affects the inputs.
  AppendInstruction(load_class);
  load_class->SetLoadKind(load_kind);
  return load_class;
}

void HInstructionBuilder::BuildTypeCheck(const Instruction& instruction,
                                         uint8_t destination,
                                         uint8_t reference,
                                         dex::TypeIndex type_index,
                                         uint32_t dex_pc) {
  HInstruction* object = LoadLocal(reference, Primitive::kPrimNot);
  HLoadClass* cls = BuildLoadClass(type_index, dex_pc);

  ScopedObjectAccess soa(Thread::Current());
  TypeCheckKind check_kind = ComputeTypeCheckKind(cls->GetClass());
  if (instruction.Opcode() == Instruction::INSTANCE_OF) {
    AppendInstruction(new (arena_) HInstanceOf(object, cls, check_kind, dex_pc));
    UpdateLocal(destination, current_block_->GetLastInstruction());
  } else {
    DCHECK_EQ(instruction.Opcode(), Instruction::CHECK_CAST);
    // We emit a CheckCast followed by a BoundType. CheckCast is a statement
    // which may throw. If it succeeds BoundType sets the new type of `object`
    // for all subsequent uses.
    AppendInstruction(new (arena_) HCheckCast(object, cls, check_kind, dex_pc));
    AppendInstruction(new (arena_) HBoundType(object, dex_pc));
    UpdateLocal(reference, current_block_->GetLastInstruction());
  }
}

bool HInstructionBuilder::NeedsAccessCheck(dex::TypeIndex type_index, bool* finalizable) const {
  return !compiler_driver_->CanAccessInstantiableTypeWithoutChecks(
      LookupReferrerClass(), LookupResolvedType(type_index, *dex_compilation_unit_), finalizable);
}

bool HInstructionBuilder::CanDecodeQuickenedInfo() const {
  return !quicken_info_.IsNull();
}

uint16_t HInstructionBuilder::LookupQuickenedInfo(uint32_t quicken_index) {
  DCHECK(CanDecodeQuickenedInfo());
  return quicken_info_.GetData(quicken_index);
}

bool HInstructionBuilder::ProcessDexInstruction(const Instruction& instruction,
                                                uint32_t dex_pc,
                                                size_t quicken_index) {
  switch (instruction.Opcode()) {
    case Instruction::CONST_4: {
      int32_t register_index = instruction.VRegA();
      HIntConstant* constant = graph_->GetIntConstant(instruction.VRegB_11n(), dex_pc);
      UpdateLocal(register_index, constant);
      break;
    }

    case Instruction::CONST_16: {
      int32_t register_index = instruction.VRegA();
      HIntConstant* constant = graph_->GetIntConstant(instruction.VRegB_21s(), dex_pc);
      UpdateLocal(register_index, constant);
      break;
    }

    case Instruction::CONST: {
      int32_t register_index = instruction.VRegA();
      HIntConstant* constant = graph_->GetIntConstant(instruction.VRegB_31i(), dex_pc);
      UpdateLocal(register_index, constant);
      break;
    }

    case Instruction::CONST_HIGH16: {
      int32_t register_index = instruction.VRegA();
      HIntConstant* constant = graph_->GetIntConstant(instruction.VRegB_21h() << 16, dex_pc);
      UpdateLocal(register_index, constant);
      break;
    }

    case Instruction::CONST_WIDE_16: {
      int32_t register_index = instruction.VRegA();
      // Get 16 bits of constant value, sign extended to 64 bits.
      int64_t value = instruction.VRegB_21s();
      value <<= 48;
      value >>= 48;
      HLongConstant* constant = graph_->GetLongConstant(value, dex_pc);
      UpdateLocal(register_index, constant);
      break;
    }

    case Instruction::CONST_WIDE_32: {
      int32_t register_index = instruction.VRegA();
      // Get 32 bits of constant value, sign extended to 64 bits.
      int64_t value = instruction.VRegB_31i();
      value <<= 32;
      value >>= 32;
      HLongConstant* constant = graph_->GetLongConstant(value, dex_pc);
      UpdateLocal(register_index, constant);
      break;
    }

    case Instruction::CONST_WIDE: {
      int32_t register_index = instruction.VRegA();
      HLongConstant* constant = graph_->GetLongConstant(instruction.VRegB_51l(), dex_pc);
      UpdateLocal(register_index, constant);
      break;
    }

    case Instruction::CONST_WIDE_HIGH16: {
      int32_t register_index = instruction.VRegA();
      int64_t value = static_cast<int64_t>(instruction.VRegB_21h()) << 48;
      HLongConstant* constant = graph_->GetLongConstant(value, dex_pc);
      UpdateLocal(register_index, constant);
      break;
    }

    // Note that the SSA building will refine the types.
    case Instruction::MOVE:
    case Instruction::MOVE_FROM16:
    case Instruction::MOVE_16: {
      HInstruction* value = LoadLocal(instruction.VRegB(), Primitive::kPrimInt);
      UpdateLocal(instruction.VRegA(), value);
      break;
    }

    // Note that the SSA building will refine the types.
    case Instruction::MOVE_WIDE:
    case Instruction::MOVE_WIDE_FROM16:
    case Instruction::MOVE_WIDE_16: {
      HInstruction* value = LoadLocal(instruction.VRegB(), Primitive::kPrimLong);
      UpdateLocal(instruction.VRegA(), value);
      break;
    }

    case Instruction::MOVE_OBJECT:
    case Instruction::MOVE_OBJECT_16:
    case Instruction::MOVE_OBJECT_FROM16: {
      // The verifier has no notion of a null type, so a move-object of constant 0
      // will lead to the same constant 0 in the destination register. To mimic
      // this behavior, we just pretend we haven't seen a type change (int to reference)
      // for the 0 constant and phis. We rely on our type propagation to eventually get the
      // types correct.
      uint32_t reg_number = instruction.VRegB();
      HInstruction* value = (*current_locals_)[reg_number];
      if (value->IsIntConstant()) {
        DCHECK_EQ(value->AsIntConstant()->GetValue(), 0);
      } else if (value->IsPhi()) {
        DCHECK(value->GetType() == Primitive::kPrimInt || value->GetType() == Primitive::kPrimNot);
      } else {
        value = LoadLocal(reg_number, Primitive::kPrimNot);
      }
      UpdateLocal(instruction.VRegA(), value);
      break;
    }

    case Instruction::RETURN_VOID_NO_BARRIER:
    case Instruction::RETURN_VOID: {
      BuildReturn(instruction, Primitive::kPrimVoid, dex_pc);
      break;
    }

#define IF_XX(comparison, cond) \
    case Instruction::IF_##cond: If_22t<comparison>(instruction, dex_pc); break; \
    case Instruction::IF_##cond##Z: If_21t<comparison>(instruction, dex_pc); break

    IF_XX(HEqual, EQ);
    IF_XX(HNotEqual, NE);
    IF_XX(HLessThan, LT);
    IF_XX(HLessThanOrEqual, LE);
    IF_XX(HGreaterThan, GT);
    IF_XX(HGreaterThanOrEqual, GE);

    case Instruction::GOTO:
    case Instruction::GOTO_16:
    case Instruction::GOTO_32: {
      AppendInstruction(new (arena_) HGoto(dex_pc));
      current_block_ = nullptr;
      break;
    }

    case Instruction::RETURN: {
      BuildReturn(instruction, return_type_, dex_pc);
      break;
    }

    case Instruction::RETURN_OBJECT: {
      BuildReturn(instruction, return_type_, dex_pc);
      break;
    }

    case Instruction::RETURN_WIDE: {
      BuildReturn(instruction, return_type_, dex_pc);
      break;
    }

    case Instruction::INVOKE_DIRECT:
    case Instruction::INVOKE_INTERFACE:
    case Instruction::INVOKE_STATIC:
    case Instruction::INVOKE_SUPER:
    case Instruction::INVOKE_VIRTUAL:
    case Instruction::INVOKE_VIRTUAL_QUICK: {
      uint16_t method_idx;
      if (instruction.Opcode() == Instruction::INVOKE_VIRTUAL_QUICK) {
        if (!CanDecodeQuickenedInfo()) {
          return false;
        }
        method_idx = LookupQuickenedInfo(quicken_index);
      } else {
        method_idx = instruction.VRegB_35c();
      }
      uint32_t number_of_vreg_arguments = instruction.VRegA_35c();
      uint32_t args[5];
      instruction.GetVarArgs(args);
      if (!BuildInvoke(instruction, dex_pc, method_idx,
                       number_of_vreg_arguments, false, args, -1)) {
        return false;
      }
      break;
    }

    case Instruction::INVOKE_DIRECT_RANGE:
    case Instruction::INVOKE_INTERFACE_RANGE:
    case Instruction::INVOKE_STATIC_RANGE:
    case Instruction::INVOKE_SUPER_RANGE:
    case Instruction::INVOKE_VIRTUAL_RANGE:
    case Instruction::INVOKE_VIRTUAL_RANGE_QUICK: {
      uint16_t method_idx;
      if (instruction.Opcode() == Instruction::INVOKE_VIRTUAL_RANGE_QUICK) {
        if (!CanDecodeQuickenedInfo()) {
          return false;
        }
        method_idx = LookupQuickenedInfo(quicken_index);
      } else {
        method_idx = instruction.VRegB_3rc();
      }
      uint32_t number_of_vreg_arguments = instruction.VRegA_3rc();
      uint32_t register_index = instruction.VRegC();
      if (!BuildInvoke(instruction, dex_pc, method_idx,
                       number_of_vreg_arguments, true, nullptr, register_index)) {
        return false;
      }
      break;
    }

    case Instruction::INVOKE_POLYMORPHIC: {
      uint16_t method_idx = instruction.VRegB_45cc();
      uint16_t proto_idx = instruction.VRegH_45cc();
      uint32_t number_of_vreg_arguments = instruction.VRegA_45cc();
      uint32_t args[5];
      instruction.GetVarArgs(args);
      return BuildInvokePolymorphic(instruction,
                                    dex_pc,
                                    method_idx,
                                    proto_idx,
                                    number_of_vreg_arguments,
                                    false,
                                    args,
                                    -1);
    }

    case Instruction::INVOKE_POLYMORPHIC_RANGE: {
      uint16_t method_idx = instruction.VRegB_4rcc();
      uint16_t proto_idx = instruction.VRegH_4rcc();
      uint32_t number_of_vreg_arguments = instruction.VRegA_4rcc();
      uint32_t register_index = instruction.VRegC_4rcc();
      return BuildInvokePolymorphic(instruction,
                                    dex_pc,
                                    method_idx,
                                    proto_idx,
                                    number_of_vreg_arguments,
                                    true,
                                    nullptr,
                                    register_index);
    }

    case Instruction::NEG_INT: {
      Unop_12x<HNeg>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::NEG_LONG: {
      Unop_12x<HNeg>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::NEG_FLOAT: {
      Unop_12x<HNeg>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::NEG_DOUBLE: {
      Unop_12x<HNeg>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::NOT_INT: {
      Unop_12x<HNot>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::NOT_LONG: {
      Unop_12x<HNot>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::INT_TO_LONG: {
      Conversion_12x(instruction, Primitive::kPrimInt, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::INT_TO_FLOAT: {
      Conversion_12x(instruction, Primitive::kPrimInt, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::INT_TO_DOUBLE: {
      Conversion_12x(instruction, Primitive::kPrimInt, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::LONG_TO_INT: {
      Conversion_12x(instruction, Primitive::kPrimLong, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::LONG_TO_FLOAT: {
      Conversion_12x(instruction, Primitive::kPrimLong, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::LONG_TO_DOUBLE: {
      Conversion_12x(instruction, Primitive::kPrimLong, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::FLOAT_TO_INT: {
      Conversion_12x(instruction, Primitive::kPrimFloat, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::FLOAT_TO_LONG: {
      Conversion_12x(instruction, Primitive::kPrimFloat, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::FLOAT_TO_DOUBLE: {
      Conversion_12x(instruction, Primitive::kPrimFloat, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::DOUBLE_TO_INT: {
      Conversion_12x(instruction, Primitive::kPrimDouble, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::DOUBLE_TO_LONG: {
      Conversion_12x(instruction, Primitive::kPrimDouble, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::DOUBLE_TO_FLOAT: {
      Conversion_12x(instruction, Primitive::kPrimDouble, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::INT_TO_BYTE: {
      Conversion_12x(instruction, Primitive::kPrimInt, Primitive::kPrimByte, dex_pc);
      break;
    }

    case Instruction::INT_TO_SHORT: {
      Conversion_12x(instruction, Primitive::kPrimInt, Primitive::kPrimShort, dex_pc);
      break;
    }

    case Instruction::INT_TO_CHAR: {
      Conversion_12x(instruction, Primitive::kPrimInt, Primitive::kPrimChar, dex_pc);
      break;
    }

    case Instruction::ADD_INT: {
      Binop_23x<HAdd>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::ADD_LONG: {
      Binop_23x<HAdd>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::ADD_DOUBLE: {
      Binop_23x<HAdd>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::ADD_FLOAT: {
      Binop_23x<HAdd>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::SUB_INT: {
      Binop_23x<HSub>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::SUB_LONG: {
      Binop_23x<HSub>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::SUB_FLOAT: {
      Binop_23x<HSub>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::SUB_DOUBLE: {
      Binop_23x<HSub>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::ADD_INT_2ADDR: {
      Binop_12x<HAdd>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::MUL_INT: {
      Binop_23x<HMul>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::MUL_LONG: {
      Binop_23x<HMul>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::MUL_FLOAT: {
      Binop_23x<HMul>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::MUL_DOUBLE: {
      Binop_23x<HMul>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::DIV_INT: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegB(), instruction.VRegC(),
                         dex_pc, Primitive::kPrimInt, false, true);
      break;
    }

    case Instruction::DIV_LONG: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegB(), instruction.VRegC(),
                         dex_pc, Primitive::kPrimLong, false, true);
      break;
    }

    case Instruction::DIV_FLOAT: {
      Binop_23x<HDiv>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::DIV_DOUBLE: {
      Binop_23x<HDiv>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::REM_INT: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegB(), instruction.VRegC(),
                         dex_pc, Primitive::kPrimInt, false, false);
      break;
    }

    case Instruction::REM_LONG: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegB(), instruction.VRegC(),
                         dex_pc, Primitive::kPrimLong, false, false);
      break;
    }

    case Instruction::REM_FLOAT: {
      Binop_23x<HRem>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::REM_DOUBLE: {
      Binop_23x<HRem>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::AND_INT: {
      Binop_23x<HAnd>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::AND_LONG: {
      Binop_23x<HAnd>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::SHL_INT: {
      Binop_23x_shift<HShl>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::SHL_LONG: {
      Binop_23x_shift<HShl>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::SHR_INT: {
      Binop_23x_shift<HShr>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::SHR_LONG: {
      Binop_23x_shift<HShr>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::USHR_INT: {
      Binop_23x_shift<HUShr>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::USHR_LONG: {
      Binop_23x_shift<HUShr>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::OR_INT: {
      Binop_23x<HOr>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::OR_LONG: {
      Binop_23x<HOr>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::XOR_INT: {
      Binop_23x<HXor>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::XOR_LONG: {
      Binop_23x<HXor>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::ADD_LONG_2ADDR: {
      Binop_12x<HAdd>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::ADD_DOUBLE_2ADDR: {
      Binop_12x<HAdd>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::ADD_FLOAT_2ADDR: {
      Binop_12x<HAdd>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::SUB_INT_2ADDR: {
      Binop_12x<HSub>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::SUB_LONG_2ADDR: {
      Binop_12x<HSub>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::SUB_FLOAT_2ADDR: {
      Binop_12x<HSub>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::SUB_DOUBLE_2ADDR: {
      Binop_12x<HSub>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::MUL_INT_2ADDR: {
      Binop_12x<HMul>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::MUL_LONG_2ADDR: {
      Binop_12x<HMul>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::MUL_FLOAT_2ADDR: {
      Binop_12x<HMul>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::MUL_DOUBLE_2ADDR: {
      Binop_12x<HMul>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::DIV_INT_2ADDR: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegA(), instruction.VRegB(),
                         dex_pc, Primitive::kPrimInt, false, true);
      break;
    }

    case Instruction::DIV_LONG_2ADDR: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegA(), instruction.VRegB(),
                         dex_pc, Primitive::kPrimLong, false, true);
      break;
    }

    case Instruction::REM_INT_2ADDR: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegA(), instruction.VRegB(),
                         dex_pc, Primitive::kPrimInt, false, false);
      break;
    }

    case Instruction::REM_LONG_2ADDR: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegA(), instruction.VRegB(),
                         dex_pc, Primitive::kPrimLong, false, false);
      break;
    }

    case Instruction::REM_FLOAT_2ADDR: {
      Binop_12x<HRem>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::REM_DOUBLE_2ADDR: {
      Binop_12x<HRem>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::SHL_INT_2ADDR: {
      Binop_12x_shift<HShl>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::SHL_LONG_2ADDR: {
      Binop_12x_shift<HShl>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::SHR_INT_2ADDR: {
      Binop_12x_shift<HShr>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::SHR_LONG_2ADDR: {
      Binop_12x_shift<HShr>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::USHR_INT_2ADDR: {
      Binop_12x_shift<HUShr>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::USHR_LONG_2ADDR: {
      Binop_12x_shift<HUShr>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::DIV_FLOAT_2ADDR: {
      Binop_12x<HDiv>(instruction, Primitive::kPrimFloat, dex_pc);
      break;
    }

    case Instruction::DIV_DOUBLE_2ADDR: {
      Binop_12x<HDiv>(instruction, Primitive::kPrimDouble, dex_pc);
      break;
    }

    case Instruction::AND_INT_2ADDR: {
      Binop_12x<HAnd>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::AND_LONG_2ADDR: {
      Binop_12x<HAnd>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::OR_INT_2ADDR: {
      Binop_12x<HOr>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::OR_LONG_2ADDR: {
      Binop_12x<HOr>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::XOR_INT_2ADDR: {
      Binop_12x<HXor>(instruction, Primitive::kPrimInt, dex_pc);
      break;
    }

    case Instruction::XOR_LONG_2ADDR: {
      Binop_12x<HXor>(instruction, Primitive::kPrimLong, dex_pc);
      break;
    }

    case Instruction::ADD_INT_LIT16: {
      Binop_22s<HAdd>(instruction, false, dex_pc);
      break;
    }

    case Instruction::AND_INT_LIT16: {
      Binop_22s<HAnd>(instruction, false, dex_pc);
      break;
    }

    case Instruction::OR_INT_LIT16: {
      Binop_22s<HOr>(instruction, false, dex_pc);
      break;
    }

    case Instruction::XOR_INT_LIT16: {
      Binop_22s<HXor>(instruction, false, dex_pc);
      break;
    }

    case Instruction::RSUB_INT: {
      Binop_22s<HSub>(instruction, true, dex_pc);
      break;
    }

    case Instruction::MUL_INT_LIT16: {
      Binop_22s<HMul>(instruction, false, dex_pc);
      break;
    }

    case Instruction::ADD_INT_LIT8: {
      Binop_22b<HAdd>(instruction, false, dex_pc);
      break;
    }

    case Instruction::AND_INT_LIT8: {
      Binop_22b<HAnd>(instruction, false, dex_pc);
      break;
    }

    case Instruction::OR_INT_LIT8: {
      Binop_22b<HOr>(instruction, false, dex_pc);
      break;
    }

    case Instruction::XOR_INT_LIT8: {
      Binop_22b<HXor>(instruction, false, dex_pc);
      break;
    }

    case Instruction::RSUB_INT_LIT8: {
      Binop_22b<HSub>(instruction, true, dex_pc);
      break;
    }

    case Instruction::MUL_INT_LIT8: {
      Binop_22b<HMul>(instruction, false, dex_pc);
      break;
    }

    case Instruction::DIV_INT_LIT16:
    case Instruction::DIV_INT_LIT8: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegB(), instruction.VRegC(),
                         dex_pc, Primitive::kPrimInt, true, true);
      break;
    }

    case Instruction::REM_INT_LIT16:
    case Instruction::REM_INT_LIT8: {
      BuildCheckedDivRem(instruction.VRegA(), instruction.VRegB(), instruction.VRegC(),
                         dex_pc, Primitive::kPrimInt, true, false);
      break;
    }

    case Instruction::SHL_INT_LIT8: {
      Binop_22b<HShl>(instruction, false, dex_pc);
      break;
    }

    case Instruction::SHR_INT_LIT8: {
      Binop_22b<HShr>(instruction, false, dex_pc);
      break;
    }

    case Instruction::USHR_INT_LIT8: {
      Binop_22b<HUShr>(instruction, false, dex_pc);
      break;
    }

    case Instruction::NEW_INSTANCE: {
      HNewInstance* new_instance =
          BuildNewInstance(dex::TypeIndex(instruction.VRegB_21c()), dex_pc);
      DCHECK(new_instance != nullptr);

      UpdateLocal(instruction.VRegA(), current_block_->GetLastInstruction());
      BuildConstructorFenceForAllocation(new_instance);
      break;
    }

    case Instruction::NEW_ARRAY: {
      dex::TypeIndex type_index(instruction.VRegC_22c());
      HInstruction* length = LoadLocal(instruction.VRegB_22c(), Primitive::kPrimInt);
      HLoadClass* cls = BuildLoadClass(type_index, dex_pc);

      HNewArray* new_array = new (arena_) HNewArray(cls, length, dex_pc);
      AppendInstruction(new_array);
      UpdateLocal(instruction.VRegA_22c(), current_block_->GetLastInstruction());
      BuildConstructorFenceForAllocation(new_array);
      break;
    }

    case Instruction::FILLED_NEW_ARRAY: {
      uint32_t number_of_vreg_arguments = instruction.VRegA_35c();
      dex::TypeIndex type_index(instruction.VRegB_35c());
      uint32_t args[5];
      instruction.GetVarArgs(args);
      HNewArray* new_array = BuildFilledNewArray(dex_pc,
                                                 type_index,
                                                 number_of_vreg_arguments,
                                                 /* is_range */ false,
                                                 args,
                                                 /* register_index */ 0);
      BuildConstructorFenceForAllocation(new_array);
      break;
    }

    case Instruction::FILLED_NEW_ARRAY_RANGE: {
      uint32_t number_of_vreg_arguments = instruction.VRegA_3rc();
      dex::TypeIndex type_index(instruction.VRegB_3rc());
      uint32_t register_index = instruction.VRegC_3rc();
      HNewArray* new_array = BuildFilledNewArray(dex_pc,
                                                 type_index,
                                                 number_of_vreg_arguments,
                                                 /* is_range */ true,
                                                 /* args*/ nullptr,
                                                 register_index);
      BuildConstructorFenceForAllocation(new_array);
      break;
    }

    case Instruction::FILL_ARRAY_DATA: {
      BuildFillArrayData(instruction, dex_pc);
      break;
    }

    case Instruction::MOVE_RESULT:
    case Instruction::MOVE_RESULT_WIDE:
    case Instruction::MOVE_RESULT_OBJECT: {
      DCHECK(latest_result_ != nullptr);
      UpdateLocal(instruction.VRegA(), latest_result_);
      latest_result_ = nullptr;
      break;
    }

    case Instruction::CMP_LONG: {
      Binop_23x_cmp(instruction, Primitive::kPrimLong, ComparisonBias::kNoBias, dex_pc);
      break;
    }

    case Instruction::CMPG_FLOAT: {
      Binop_23x_cmp(instruction, Primitive::kPrimFloat, ComparisonBias::kGtBias, dex_pc);
      break;
    }

    case Instruction::CMPG_DOUBLE: {
      Binop_23x_cmp(instruction, Primitive::kPrimDouble, ComparisonBias::kGtBias, dex_pc);
      break;
    }

    case Instruction::CMPL_FLOAT: {
      Binop_23x_cmp(instruction, Primitive::kPrimFloat, ComparisonBias::kLtBias, dex_pc);
      break;
    }

    case Instruction::CMPL_DOUBLE: {
      Binop_23x_cmp(instruction, Primitive::kPrimDouble, ComparisonBias::kLtBias, dex_pc);
      break;
    }

    case Instruction::NOP:
      break;

    case Instruction::IGET:
    case Instruction::IGET_QUICK:
    case Instruction::IGET_WIDE:
    case Instruction::IGET_WIDE_QUICK:
    case Instruction::IGET_OBJECT:
    case Instruction::IGET_OBJECT_QUICK:
    case Instruction::IGET_BOOLEAN:
    case Instruction::IGET_BOOLEAN_QUICK:
    case Instruction::IGET_BYTE:
    case Instruction::IGET_BYTE_QUICK:
    case Instruction::IGET_CHAR:
    case Instruction::IGET_CHAR_QUICK:
    case Instruction::IGET_SHORT:
    case Instruction::IGET_SHORT_QUICK: {
      if (!BuildInstanceFieldAccess(instruction, dex_pc, false, quicken_index)) {
        return false;
      }
      break;
    }

    case Instruction::IPUT:
    case Instruction::IPUT_QUICK:
    case Instruction::IPUT_WIDE:
    case Instruction::IPUT_WIDE_QUICK:
    case Instruction::IPUT_OBJECT:
    case Instruction::IPUT_OBJECT_QUICK:
    case Instruction::IPUT_BOOLEAN:
    case Instruction::IPUT_BOOLEAN_QUICK:
    case Instruction::IPUT_BYTE:
    case Instruction::IPUT_BYTE_QUICK:
    case Instruction::IPUT_CHAR:
    case Instruction::IPUT_CHAR_QUICK:
    case Instruction::IPUT_SHORT:
    case Instruction::IPUT_SHORT_QUICK: {
      if (!BuildInstanceFieldAccess(instruction, dex_pc, true, quicken_index)) {
        return false;
      }
      break;
    }

    case Instruction::SGET:
    case Instruction::SGET_WIDE:
    case Instruction::SGET_OBJECT:
    case Instruction::SGET_BOOLEAN:
    case Instruction::SGET_BYTE:
    case Instruction::SGET_CHAR:
    case Instruction::SGET_SHORT: {
      if (!BuildStaticFieldAccess(instruction, dex_pc, false)) {
        return false;
      }
      break;
    }

    case Instruction::SPUT:
    case Instruction::SPUT_WIDE:
    case Instruction::SPUT_OBJECT:
    case Instruction::SPUT_BOOLEAN:
    case Instruction::SPUT_BYTE:
    case Instruction::SPUT_CHAR:
    case Instruction::SPUT_SHORT: {
      if (!BuildStaticFieldAccess(instruction, dex_pc, true)) {
        return false;
      }
      break;
    }

#define ARRAY_XX(kind, anticipated_type)                                          \
    case Instruction::AGET##kind: {                                               \
      BuildArrayAccess(instruction, dex_pc, false, anticipated_type);         \
      break;                                                                      \
    }                                                                             \
    case Instruction::APUT##kind: {                                               \
      BuildArrayAccess(instruction, dex_pc, true, anticipated_type);          \
      break;                                                                      \
    }

    ARRAY_XX(, Primitive::kPrimInt);
    ARRAY_XX(_WIDE, Primitive::kPrimLong);
    ARRAY_XX(_OBJECT, Primitive::kPrimNot);
    ARRAY_XX(_BOOLEAN, Primitive::kPrimBoolean);
    ARRAY_XX(_BYTE, Primitive::kPrimByte);
    ARRAY_XX(_CHAR, Primitive::kPrimChar);
    ARRAY_XX(_SHORT, Primitive::kPrimShort);

    case Instruction::ARRAY_LENGTH: {
      HInstruction* object = LoadNullCheckedLocal(instruction.VRegB_12x(), dex_pc);
      AppendInstruction(new (arena_) HArrayLength(object, dex_pc));
      UpdateLocal(instruction.VRegA_12x(), current_block_->GetLastInstruction());
      break;
    }

    case Instruction::CONST_STRING: {
      dex::StringIndex string_index(instruction.VRegB_21c());
      AppendInstruction(
          new (arena_) HLoadString(graph_->GetCurrentMethod(), string_index, *dex_file_, dex_pc));
      UpdateLocal(instruction.VRegA_21c(), current_block_->GetLastInstruction());
      break;
    }

    case Instruction::CONST_STRING_JUMBO: {
      dex::StringIndex string_index(instruction.VRegB_31c());
      AppendInstruction(
          new (arena_) HLoadString(graph_->GetCurrentMethod(), string_index, *dex_file_, dex_pc));
      UpdateLocal(instruction.VRegA_31c(), current_block_->GetLastInstruction());
      break;
    }

    case Instruction::CONST_CLASS: {
      dex::TypeIndex type_index(instruction.VRegB_21c());
      BuildLoadClass(type_index, dex_pc);
      UpdateLocal(instruction.VRegA_21c(), current_block_->GetLastInstruction());
      break;
    }

    case Instruction::MOVE_EXCEPTION: {
      AppendInstruction(new (arena_) HLoadException(dex_pc));
      UpdateLocal(instruction.VRegA_11x(), current_block_->GetLastInstruction());
      AppendInstruction(new (arena_) HClearException(dex_pc));
      break;
    }

    case Instruction::THROW: {
      HInstruction* exception = LoadLocal(instruction.VRegA_11x(), Primitive::kPrimNot);
      AppendInstruction(new (arena_) HThrow(exception, dex_pc));
      // We finished building this block. Set the current block to null to avoid
      // adding dead instructions to it.
      current_block_ = nullptr;
      break;
    }

    case Instruction::INSTANCE_OF: {
      uint8_t destination = instruction.VRegA_22c();
      uint8_t reference = instruction.VRegB_22c();
      dex::TypeIndex type_index(instruction.VRegC_22c());
      BuildTypeCheck(instruction, destination, reference, type_index, dex_pc);
      break;
    }

    case Instruction::CHECK_CAST: {
      uint8_t reference = instruction.VRegA_21c();
      dex::TypeIndex type_index(instruction.VRegB_21c());
      BuildTypeCheck(instruction, -1, reference, type_index, dex_pc);
      break;
    }

    case Instruction::MONITOR_ENTER: {
      AppendInstruction(new (arena_) HMonitorOperation(
          LoadLocal(instruction.VRegA_11x(), Primitive::kPrimNot),
          HMonitorOperation::OperationKind::kEnter,
          dex_pc));
      break;
    }

    case Instruction::MONITOR_EXIT: {
      AppendInstruction(new (arena_) HMonitorOperation(
          LoadLocal(instruction.VRegA_11x(), Primitive::kPrimNot),
          HMonitorOperation::OperationKind::kExit,
          dex_pc));
      break;
    }

    case Instruction::SPARSE_SWITCH:
    case Instruction::PACKED_SWITCH: {
      BuildSwitch(instruction, dex_pc);
      break;
    }

    default:
      VLOG(compiler) << "Did not compile "
                     << dex_file_->PrettyMethod(dex_compilation_unit_->GetDexMethodIndex())
                     << " because of unhandled instruction "
                     << instruction.Name();
      MaybeRecordStat(compilation_stats_,
                      MethodCompilationStat::kNotCompiledUnhandledInstruction);
      return false;
  }
  return true;
}  // NOLINT(readability/fn_size)

ObjPtr<mirror::Class> HInstructionBuilder::LookupResolvedType(
    dex::TypeIndex type_index,
    const DexCompilationUnit& compilation_unit) const {
  return ClassLinker::LookupResolvedType(
        type_index, compilation_unit.GetDexCache().Get(), compilation_unit.GetClassLoader().Get());
}

ObjPtr<mirror::Class> HInstructionBuilder::LookupReferrerClass() const {
  // TODO: Cache the result in a Handle<mirror::Class>.
  const DexFile::MethodId& method_id =
      dex_compilation_unit_->GetDexFile()->GetMethodId(dex_compilation_unit_->GetDexMethodIndex());
  return LookupResolvedType(method_id.class_idx_, *dex_compilation_unit_);
}

}  // namespace art