[turbofan] remove dependence of InstructionBlock on BasicBlock

BUG=

Review URL: https://codereview.chromium.org/951553005

Cr-Commit-Position: refs/heads/master@{#26859}

src/compiler/arm/code-generator-arm.cc

@@ -740,7 +740,7 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
 }
 
 
-void CodeGenerator::AssembleArchJump(BasicBlock::RpoNumber target) {
+void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ b(GetLabel(target));
 }
 

src/compiler/arm64/code-generator-arm64.cc

@@ -841,7 +841,7 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
 }
 
 
-void CodeGenerator::AssembleArchJump(BasicBlock::RpoNumber target) {
+void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ B(GetLabel(target));
 }
 

src/compiler/code-generator-impl.h

@@ -63,7 +63,7 @@ class InstructionOperandConverter {
 
   Label* InputLabel(size_t index) { return ToLabel(instr_->InputAt(index)); }
 
-  BasicBlock::RpoNumber InputRpo(size_t index) {
+  RpoNumber InputRpo(size_t index) {
     return ToRpoNumber(instr_->InputAt(index));
   }
 
@@ -85,7 +85,7 @@ class InstructionOperandConverter {
     return gen_->GetLabel(ToRpoNumber(op));
   }
 
-  BasicBlock::RpoNumber ToRpoNumber(InstructionOperand* op) {
+  RpoNumber ToRpoNumber(InstructionOperand* op) {
     return ToConstant(op).ToRpoNumber();
   }
 

src/compiler/code-generator.cc

@@ -37,7 +37,7 @@ CodeGenerator::CodeGenerator(Frame* frame, Linkage* linkage,
       code_(code),
       info_(info),
       labels_(zone()->NewArray<Label>(code->InstructionBlockCount())),
-      current_block_(BasicBlock::RpoNumber::Invalid()),
+      current_block_(RpoNumber::Invalid()),
       current_source_position_(SourcePosition::Invalid()),
       masm_(info->isolate(), NULL, 0),
       resolver_(this),
@@ -85,7 +85,7 @@ Handle<Code> CodeGenerator::GenerateCode() {
       if (FLAG_code_comments) {
         // TODO(titzer): these code comments are a giant memory leak.
         Vector<char> buffer = Vector<char>::New(32);
-        SNPrintF(buffer, "-- B%d start --", block->id().ToInt());
+        SNPrintF(buffer, "-- B%d start --", block->rpo_number().ToInt());
         masm()->RecordComment(buffer.start());
       }
       masm()->bind(GetLabel(current_block_));
@@ -159,7 +159,7 @@ Handle<Code> CodeGenerator::GenerateCode() {
 }
 
 
-bool CodeGenerator::IsNextInAssemblyOrder(BasicBlock::RpoNumber block) const {
+bool CodeGenerator::IsNextInAssemblyOrder(RpoNumber block) const {
   return code()->InstructionBlockAt(current_block_)->ao_number().IsNext(
       code()->InstructionBlockAt(block)->ao_number());
 }
@@ -199,8 +199,8 @@ void CodeGenerator::AssembleInstruction(Instruction* instr) {
     if (mode == kFlags_branch) {
       // Assemble a branch after this instruction.
       InstructionOperandConverter i(this, instr);
-      BasicBlock::RpoNumber true_rpo = i.InputRpo(instr->InputCount() - 2);
-      BasicBlock::RpoNumber false_rpo = i.InputRpo(instr->InputCount() - 1);
+      RpoNumber true_rpo = i.InputRpo(instr->InputCount() - 2);
+      RpoNumber false_rpo = i.InputRpo(instr->InputCount() - 1);
 
       if (true_rpo == false_rpo) {
         // redundant branch.
@@ -343,7 +343,7 @@ void CodeGenerator::RecordCallPosition(Instruction* instr) {
 
   if (flags & CallDescriptor::kHasExceptionHandler) {
     InstructionOperandConverter i(this, instr);
-    BasicBlock::RpoNumber handler_rpo =
+    RpoNumber handler_rpo =
         i.InputRpo(static_cast<int>(instr->InputCount()) - 1);
     handlers_.push_back({GetLabel(handler_rpo), masm()->pc_offset()});
   }
@@ -592,9 +592,7 @@ void CodeGenerator::AssembleArchBoolean(Instruction* instr,
 }
 
 
-void CodeGenerator::AssembleArchJump(BasicBlock::RpoNumber target) {
-  UNIMPLEMENTED();
-}
+void CodeGenerator::AssembleArchJump(RpoNumber target) { UNIMPLEMENTED(); }
 
 
 void CodeGenerator::AssembleDeoptimizerCall(int deoptimization_id) {

src/compiler/code-generator.h

@@ -41,7 +41,7 @@ class CodeGenerator FINAL : public GapResolver::Assembler {
   Isolate* isolate() const { return info_->isolate(); }
   Linkage* linkage() const { return linkage_; }
 
-  Label* GetLabel(BasicBlock::RpoNumber rpo) { return &labels_[rpo.ToSize()]; }
+  Label* GetLabel(RpoNumber rpo) { return &labels_[rpo.ToSize()]; }
 
  private:
   MacroAssembler* masm() { return &masm_; }
@@ -52,7 +52,7 @@ class CodeGenerator FINAL : public GapResolver::Assembler {
 
   // Checks if {block} will appear directly after {current_block_} when
   // assembling code, in which case, a fall-through can be used.
-  bool IsNextInAssemblyOrder(BasicBlock::RpoNumber block) const;
+  bool IsNextInAssemblyOrder(RpoNumber block) const;
 
   // Record a safepoint with the given pointer map.
   void RecordSafepoint(PointerMap* pointers, Safepoint::Kind kind,
@@ -68,7 +68,7 @@ class CodeGenerator FINAL : public GapResolver::Assembler {
   // ===========================================================================
 
   void AssembleArchInstruction(Instruction* instr);
-  void AssembleArchJump(BasicBlock::RpoNumber target);
+  void AssembleArchJump(RpoNumber target);
   void AssembleArchBranch(Instruction* instr, BranchInfo* branch);
   void AssembleArchBoolean(Instruction* instr, FlagsCondition condition);
   void AssembleArchLookupSwitch(Instruction* instr);
@@ -158,7 +158,7 @@ class CodeGenerator FINAL : public GapResolver::Assembler {
   InstructionSequence* const code_;
   CompilationInfo* const info_;
   Label* const labels_;
-  BasicBlock::RpoNumber current_block_;
+  RpoNumber current_block_;
   SourcePosition current_source_position_;
   MacroAssembler masm_;
   GapResolver resolver_;

src/compiler/graph-visualizer.cc

@@ -406,7 +406,7 @@ class GraphC1Visualizer {
   void PrintStringProperty(const char* name, const char* value);
   void PrintLongProperty(const char* name, int64_t value);
   void PrintIntProperty(const char* name, int value);
-  void PrintBlockProperty(const char* name, BasicBlock::Id block_id);
+  void PrintBlockProperty(const char* name, int rpo_number);
   void PrintNodeId(Node* n);
   void PrintNode(Node* n);
   void PrintInputs(Node* n);
@@ -469,10 +469,9 @@ void GraphC1Visualizer::PrintLongProperty(const char* name, int64_t value) {
 }
 
 
-void GraphC1Visualizer::PrintBlockProperty(const char* name,
-                                           BasicBlock::Id block_id) {
+void GraphC1Visualizer::PrintBlockProperty(const char* name, int rpo_number) {
   PrintIndent();
-  os_ << name << " \"B" << block_id << "\"\n";
+  os_ << name << " \"B" << rpo_number << "\"\n";
 }
 
 
@@ -558,21 +557,21 @@ void GraphC1Visualizer::PrintSchedule(const char* phase,
   for (size_t i = 0; i < rpo->size(); i++) {
     BasicBlock* current = (*rpo)[i];
     Tag block_tag(this, "block");
-    PrintBlockProperty("name", current->id());
+    PrintBlockProperty("name", current->rpo_number());
     PrintIntProperty("from_bci", -1);
     PrintIntProperty("to_bci", -1);
 
     PrintIndent();
     os_ << "predecessors";
     for (BasicBlock* predecessor : current->predecessors()) {
-      os_ << " \"B" << predecessor->id() << "\"";
+      os_ << " \"B" << predecessor->rpo_number() << "\"";
     }
     os_ << "\n";
 
     PrintIndent();
     os_ << "successors";
     for (BasicBlock* successor : current->successors()) {
-      os_ << " \"B" << successor->id() << "\"";
+      os_ << " \"B" << successor->rpo_number() << "\"";
     }
     os_ << "\n";
 
@@ -583,13 +582,14 @@ void GraphC1Visualizer::PrintSchedule(const char* phase,
     os_ << "flags\n";
 
     if (current->dominator() != NULL) {
-      PrintBlockProperty("dominator", current->dominator()->id());
+      PrintBlockProperty("dominator", current->dominator()->rpo_number());
     }
 
     PrintIntProperty("loop_depth", current->loop_depth());
 
     const InstructionBlock* instruction_block =
-        instructions->InstructionBlockAt(current->GetRpoNumber());
+        instructions->InstructionBlockAt(
+            RpoNumber::FromInt(current->rpo_number()));
     if (instruction_block->code_start() >= 0) {
       int first_index = instruction_block->first_instruction_index();
       int last_index = instruction_block->last_instruction_index();
@@ -654,11 +654,11 @@ void GraphC1Visualizer::PrintSchedule(const char* phase,
         if (current->control_input() != NULL) {
           PrintNode(current->control_input());
         } else {
-          os_ << -1 - current->id().ToInt() << " Goto";
+          os_ << -1 - current->rpo_number() << " Goto";
         }
         os_ << " ->";
         for (BasicBlock* successor : current->successors()) {
-          os_ << " B" << successor->id();
+          os_ << " B" << successor->rpo_number();
         }
         if (FLAG_trace_turbo_types && current->control_input() != NULL) {
           os_ << " ";

src/compiler/ia32/code-generator-ia32.cc

@@ -761,7 +761,7 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
 }
 
 
-void CodeGenerator::AssembleArchJump(BasicBlock::RpoNumber target) {
+void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ jmp(GetLabel(target));
 }
 

src/compiler/instruction-selector-impl.h

@@ -8,6 +8,7 @@
 #include "src/compiler/instruction.h"
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/linkage.h"
+#include "src/compiler/schedule.h"
 #include "src/macro-assembler.h"
 
 namespace v8 {
@@ -142,7 +143,8 @@ class OperandGenerator {
   }
 
   InstructionOperand Label(BasicBlock* block) {
-    int index = sequence()->AddImmediate(Constant(block->GetRpoNumber()));
+    int index = sequence()->AddImmediate(
+        Constant(RpoNumber::FromInt(block->rpo_number())));
     return ImmediateOperand(index);
   }
 

src/compiler/instruction-selector.cc

@@ -10,6 +10,7 @@
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/pipeline.h"
+#include "src/compiler/schedule.h"
 
 namespace v8 {
 namespace internal {
@@ -61,15 +62,15 @@ void InstructionSelector::SelectInstructions() {
   // Schedule the selected instructions.
   for (auto const block : *blocks) {
     InstructionBlock* instruction_block =
-        sequence()->InstructionBlockAt(block->GetRpoNumber());
+        sequence()->InstructionBlockAt(RpoNumber::FromInt(block->rpo_number()));
     size_t end = instruction_block->code_end();
     size_t start = instruction_block->code_start();
     DCHECK_LE(end, start);
-    sequence()->StartBlock(block->GetRpoNumber());
+    sequence()->StartBlock(RpoNumber::FromInt(block->rpo_number()));
     while (start-- > end) {
       sequence()->AddInstruction(instructions_[start]);
     }
-    sequence()->EndBlock(block->GetRpoNumber());
+    sequence()->EndBlock(RpoNumber::FromInt(block->rpo_number()));
   }
 }
 
@@ -477,7 +478,7 @@ void InstructionSelector::VisitBlock(BasicBlock* block) {
 
   // We're done with the block.
   InstructionBlock* instruction_block =
-      sequence()->InstructionBlockAt(block->GetRpoNumber());
+      sequence()->InstructionBlockAt(RpoNumber::FromInt(block->rpo_number()));
   instruction_block->set_code_start(static_cast<int>(instructions_.size()));
   instruction_block->set_code_end(current_block_end);
 
@@ -1032,7 +1033,9 @@ void InstructionSelector::VisitPhi(Node* node) {
   PhiInstruction* phi = new (instruction_zone())
       PhiInstruction(instruction_zone(), GetVirtualRegister(node),
                      static_cast<size_t>(input_count));
-  sequence()->InstructionBlockAt(current_block_->GetRpoNumber())->AddPhi(phi);
+  sequence()
+      ->InstructionBlockAt(RpoNumber::FromInt(current_block_->rpo_number()))
+      ->AddPhi(phi);
   for (int i = 0; i < input_count; ++i) {
     Node* const input = node->InputAt(i);
     MarkAsUsed(input);

src/compiler/instruction-selector.h

@@ -18,11 +18,11 @@ namespace internal {
 namespace compiler {
 
 // Forward declarations.
+class BasicBlock;
 struct CallBuffer;  // TODO(bmeurer): Remove this.
 class FlagsContinuation;
 class Linkage;
 
-
 typedef ZoneVector<InstructionOperand> InstructionOperandVector;
 
 

src/compiler/instruction.cc

@@ -5,6 +5,7 @@
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
+#include "src/compiler/schedule.h"
 
 namespace v8 {
 namespace internal {
@@ -375,15 +376,12 @@ void PhiInstruction::SetInput(size_t offset, int virtual_register) {
 }
 
 
-InstructionBlock::InstructionBlock(Zone* zone, BasicBlock::Id id,
-                                   BasicBlock::RpoNumber rpo_number,
-                                   BasicBlock::RpoNumber loop_header,
-                                   BasicBlock::RpoNumber loop_end,
+InstructionBlock::InstructionBlock(Zone* zone, RpoNumber rpo_number,
+                                   RpoNumber loop_header, RpoNumber loop_end,
                                    bool deferred)
     : successors_(zone),
       predecessors_(zone),
       phis_(zone),
-      id_(id),
       ao_number_(rpo_number),
       rpo_number_(rpo_number),
       loop_header_(loop_header),
@@ -393,8 +391,7 @@ InstructionBlock::InstructionBlock(Zone* zone, BasicBlock::Id id,
       deferred_(deferred) {}
 
 
-size_t InstructionBlock::PredecessorIndexOf(
-    BasicBlock::RpoNumber rpo_number) const {
+size_t InstructionBlock::PredecessorIndexOf(RpoNumber rpo_number) const {
   size_t j = 0;
   for (InstructionBlock::Predecessors::const_iterator i = predecessors_.begin();
        i != predecessors_.end(); ++i, ++j) {
@@ -404,31 +401,31 @@ size_t InstructionBlock::PredecessorIndexOf(
 }
 
 
-static BasicBlock::RpoNumber GetRpo(BasicBlock* block) {
-  if (block == NULL) return BasicBlock::RpoNumber::Invalid();
-  return block->GetRpoNumber();
+static RpoNumber GetRpo(const BasicBlock* block) {
+  if (block == NULL) return RpoNumber::Invalid();
+  return RpoNumber::FromInt(block->rpo_number());
 }
 
 
-static BasicBlock::RpoNumber GetLoopEndRpo(const BasicBlock* block) {
-  if (!block->IsLoopHeader()) return BasicBlock::RpoNumber::Invalid();
-  return block->loop_end()->GetRpoNumber();
+static RpoNumber GetLoopEndRpo(const BasicBlock* block) {
+  if (!block->IsLoopHeader()) return RpoNumber::Invalid();
+  return RpoNumber::FromInt(block->loop_end()->rpo_number());
 }
 
 
 static InstructionBlock* InstructionBlockFor(Zone* zone,
                                              const BasicBlock* block) {
-  InstructionBlock* instr_block = new (zone) InstructionBlock(
-      zone, block->id(), block->GetRpoNumber(), GetRpo(block->loop_header()),
+  InstructionBlock* instr_block = new (zone)
+      InstructionBlock(zone, GetRpo(block), GetRpo(block->loop_header()),
                        GetLoopEndRpo(block), block->deferred());
   // Map successors and precessors
   instr_block->successors().reserve(block->SuccessorCount());
   for (BasicBlock* successor : block->successors()) {
-    instr_block->successors().push_back(successor->GetRpoNumber());
+    instr_block->successors().push_back(GetRpo(successor));
   }
   instr_block->predecessors().reserve(block->PredecessorCount());
   for (BasicBlock* predecessor : block->predecessors()) {
-    instr_block->predecessors().push_back(predecessor->GetRpoNumber());
+    instr_block->predecessors().push_back(GetRpo(predecessor));
   }
   return instr_block;
 }
@@ -443,7 +440,7 @@ InstructionBlocks* InstructionSequence::InstructionBlocksFor(
   for (BasicBlockVector::const_iterator it = schedule->rpo_order()->begin();
        it != schedule->rpo_order()->end(); ++it, ++rpo_number) {
     DCHECK(!(*blocks)[rpo_number]);
-    DCHECK((*it)->GetRpoNumber().ToSize() == rpo_number);
+    DCHECK(GetRpo(*it).ToSize() == rpo_number);
     (*blocks)[rpo_number] = InstructionBlockFor(zone, *it);
   }
   ComputeAssemblyOrder(blocks);
@@ -455,12 +452,12 @@ void InstructionSequence::ComputeAssemblyOrder(InstructionBlocks* blocks) {
   int ao = 0;
   for (auto const block : *blocks) {
     if (!block->IsDeferred()) {
-      block->set_ao_number(BasicBlock::RpoNumber::FromInt(ao++));
+      block->set_ao_number(RpoNumber::FromInt(ao++));
     }
   }
   for (auto const block : *blocks) {
     if (block->IsDeferred()) {
-      block->set_ao_number(BasicBlock::RpoNumber::FromInt(ao++));
+      block->set_ao_number(RpoNumber::FromInt(ao++));
     }
   }
 }
@@ -493,14 +490,13 @@ int InstructionSequence::NextVirtualRegister() {
 }
 
 
-GapInstruction* InstructionSequence::GetBlockStart(
-    BasicBlock::RpoNumber rpo) const {
+GapInstruction* InstructionSequence::GetBlockStart(RpoNumber rpo) const {
   const InstructionBlock* block = InstructionBlockAt(rpo);
   return GapInstruction::cast(InstructionAt(block->code_start()));
 }
 
 
-void InstructionSequence::StartBlock(BasicBlock::RpoNumber rpo) {
+void InstructionSequence::StartBlock(RpoNumber rpo) {
   DCHECK(block_starts_.size() == rpo.ToSize());
   InstructionBlock* block = InstructionBlockAt(rpo);
   int code_start = static_cast<int>(instructions_.size());
@@ -509,7 +505,7 @@ void InstructionSequence::StartBlock(BasicBlock::RpoNumber rpo) {
 }
 
 
-void InstructionSequence::EndBlock(BasicBlock::RpoNumber rpo) {
+void InstructionSequence::EndBlock(RpoNumber rpo) {
   int end = static_cast<int>(instructions_.size());
   InstructionBlock* block = InstructionBlockAt(rpo);
   if (block->code_start() == end) {  // Empty block.  Insert a nop.
@@ -668,6 +664,11 @@ void FrameStateDescriptor::SetType(size_t index, MachineType type) {
 }
 
 
+std::ostream& operator<<(std::ostream& os, const RpoNumber& rpo) {
+  return os << rpo.ToSize();
+}
+
+
 std::ostream& operator<<(std::ostream& os,
                          const PrintableInstructionSequence& printable) {
   const InstructionSequence& code = *printable.sequence_;
@@ -681,13 +682,12 @@ std::ostream& operator<<(std::ostream& os,
     os << "CST#" << i << ": v" << it->first << " = " << it->second << "\n";
   }
   for (int i = 0; i < code.InstructionBlockCount(); i++) {
-    BasicBlock::RpoNumber rpo = BasicBlock::RpoNumber::FromInt(i);
+    RpoNumber rpo = RpoNumber::FromInt(i);
     const InstructionBlock* block = code.InstructionBlockAt(rpo);
     CHECK(block->rpo_number() == rpo);
 
-    os << "RPO#" << block->rpo_number();
+    os << "B" << block->rpo_number();
     os << ": AO#" << block->ao_number();
-    os << ": B" << block->id();
     if (block->IsDeferred()) os << " (deferred)";
     if (block->IsLoopHeader()) {
       os << " loop blocks: [" << block->rpo_number() << ", "
@@ -697,8 +697,7 @@ std::ostream& operator<<(std::ostream& os,
        << block->code_end() << ")\n  predecessors:";
 
     for (auto pred : block->predecessors()) {
-      const InstructionBlock* pred_block = code.InstructionBlockAt(pred);
-      os << " B" << pred_block->id();
+      os << " B" << pred.ToInt();
     }
     os << "\n";
 
@@ -725,8 +724,7 @@ std::ostream& operator<<(std::ostream& os,
     }
 
     for (auto succ : block->successors()) {
-      const InstructionBlock* succ_block = code.InstructionBlockAt(succ);
-      os << " B" << succ_block->id();
+      os << " B" << succ.ToInt();
     }
     os << "\n";
   }

src/compiler/instruction.h

@@ -15,7 +15,6 @@
 #include "src/compiler/instruction-codes.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/register-configuration.h"
-#include "src/compiler/schedule.h"
 #include "src/compiler/source-position.h"
 #include "src/zone-allocator.h"
 
@@ -23,6 +22,8 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
+class Schedule;
+
 // A couple of reserved opcodes are used for internal use.
 const InstructionCode kGapInstruction = -1;
 const InstructionCode kSourcePositionInstruction = -2;
@@ -691,6 +692,39 @@ class SourcePositionInstruction FINAL : public Instruction {
 };
 
 
+class RpoNumber FINAL {
+ public:
+  static const int kInvalidRpoNumber = -1;
+  int ToInt() const {
+    DCHECK(IsValid());
+    return index_;
+  }
+  size_t ToSize() const {
+    DCHECK(IsValid());
+    return static_cast<size_t>(index_);
+  }
+  bool IsValid() const { return index_ >= 0; }
+  static RpoNumber FromInt(int index) { return RpoNumber(index); }
+  static RpoNumber Invalid() { return RpoNumber(kInvalidRpoNumber); }
+
+  bool IsNext(const RpoNumber other) const {
+    DCHECK(IsValid());
+    return other.index_ == this->index_ + 1;
+  }
+
+  bool operator==(RpoNumber other) const {
+    return this->index_ == other.index_;
+  }
+
+ private:
+  explicit RpoNumber(int32_t index) : index_(index) {}
+  int32_t index_;
+};
+
+
+std::ostream& operator<<(std::ostream&, const RpoNumber&);
+
+
 class Constant FINAL {
  public:
   enum Type {
@@ -711,8 +745,7 @@ class Constant FINAL {
       : type_(kExternalReference), value_(bit_cast<intptr_t>(ref)) {}
   explicit Constant(Handle<HeapObject> obj)
       : type_(kHeapObject), value_(bit_cast<intptr_t>(obj)) {}
-  explicit Constant(BasicBlock::RpoNumber rpo)
-      : type_(kRpoNumber), value_(rpo.ToInt()) {}
+  explicit Constant(RpoNumber rpo) : type_(kRpoNumber), value_(rpo.ToInt()) {}
 
   Type type() const { return type_; }
 
@@ -745,9 +778,9 @@ class Constant FINAL {
     return bit_cast<ExternalReference>(static_cast<intptr_t>(value_));
   }
 
-  BasicBlock::RpoNumber ToRpoNumber() const {
+  RpoNumber ToRpoNumber() const {
     DCHECK_EQ(kRpoNumber, type());
-    return BasicBlock::RpoNumber::FromInt(static_cast<int>(value_));
+    return RpoNumber::FromInt(static_cast<int>(value_));
   }
 
   Handle<HeapObject> ToHeapObject() const {
@@ -831,10 +864,8 @@ class PhiInstruction FINAL : public ZoneObject {
 // Analogue of BasicBlock for Instructions instead of Nodes.
 class InstructionBlock FINAL : public ZoneObject {
  public:
-  InstructionBlock(Zone* zone, BasicBlock::Id id,
-                   BasicBlock::RpoNumber rpo_number,
-                   BasicBlock::RpoNumber loop_header,
-                   BasicBlock::RpoNumber loop_end, bool deferred);
+  InstructionBlock(Zone* zone, RpoNumber rpo_number, RpoNumber loop_header,
+                   RpoNumber loop_end, bool deferred);
 
   // Instruction indexes (used by the register allocator).
   int first_instruction_index() const {
@@ -858,23 +889,22 @@ class InstructionBlock FINAL : public ZoneObject {
 
   bool IsDeferred() const { return deferred_; }
 
-  BasicBlock::Id id() const { return id_; }
-  BasicBlock::RpoNumber ao_number() const { return ao_number_; }
-  BasicBlock::RpoNumber rpo_number() const { return rpo_number_; }
-  BasicBlock::RpoNumber loop_header() const { return loop_header_; }
-  BasicBlock::RpoNumber loop_end() const {
+  RpoNumber ao_number() const { return ao_number_; }
+  RpoNumber rpo_number() const { return rpo_number_; }
+  RpoNumber loop_header() const { return loop_header_; }
+  RpoNumber loop_end() const {
     DCHECK(IsLoopHeader());
     return loop_end_;
   }
   inline bool IsLoopHeader() const { return loop_end_.IsValid(); }
 
-  typedef ZoneVector<BasicBlock::RpoNumber> Predecessors;
+  typedef ZoneVector<RpoNumber> Predecessors;
   Predecessors& predecessors() { return predecessors_; }
   const Predecessors& predecessors() const { return predecessors_; }
   size_t PredecessorCount() const { return predecessors_.size(); }
-  size_t PredecessorIndexOf(BasicBlock::RpoNumber rpo_number) const;
+  size_t PredecessorIndexOf(RpoNumber rpo_number) const;
 
-  typedef ZoneVector<BasicBlock::RpoNumber> Successors;
+  typedef ZoneVector<RpoNumber> Successors;
   Successors& successors() { return successors_; }
   const Successors& successors() const { return successors_; }
   size_t SuccessorCount() const { return successors_.size(); }
@@ -883,19 +913,16 @@ class InstructionBlock FINAL : public ZoneObject {
   const PhiInstructions& phis() const { return phis_; }
   void AddPhi(PhiInstruction* phi) { phis_.push_back(phi); }
 
-  void set_ao_number(BasicBlock::RpoNumber ao_number) {
-    ao_number_ = ao_number;
-  }
+  void set_ao_number(RpoNumber ao_number) { ao_number_ = ao_number; }
 
  private:
   Successors successors_;
   Predecessors predecessors_;
   PhiInstructions phis_;
-  const BasicBlock::Id id_;
-  BasicBlock::RpoNumber ao_number_;  // Assembly order number.
-  const BasicBlock::RpoNumber rpo_number_;
-  const BasicBlock::RpoNumber loop_header_;
-  const BasicBlock::RpoNumber loop_end_;
+  RpoNumber ao_number_;  // Assembly order number.
+  const RpoNumber rpo_number_;
+  const RpoNumber loop_header_;
+  const RpoNumber loop_end_;
   int32_t code_start_;   // start index of arch-specific code.
   int32_t code_end_;     // end index of arch-specific code.
   const bool deferred_;  // Block contains deferred code.
@@ -937,7 +964,7 @@ class InstructionSequence FINAL : public ZoneObject {
     return static_cast<int>(instruction_blocks_->size());
   }
 
-  InstructionBlock* InstructionBlockAt(BasicBlock::RpoNumber rpo_number) {
+  InstructionBlock* InstructionBlockAt(RpoNumber rpo_number) {
     return instruction_blocks_->at(rpo_number.ToSize());
   }
 
@@ -946,8 +973,7 @@ class InstructionSequence FINAL : public ZoneObject {
         ->last_instruction_index();
   }
 
-  const InstructionBlock* InstructionBlockAt(
-      BasicBlock::RpoNumber rpo_number) const {
+  const InstructionBlock* InstructionBlockAt(RpoNumber rpo_number) const {
     return instruction_blocks_->at(rpo_number.ToSize());
   }
 
@@ -961,7 +987,7 @@ class InstructionSequence FINAL : public ZoneObject {
 
   void AddGapMove(int index, InstructionOperand* from, InstructionOperand* to);
 
-  GapInstruction* GetBlockStart(BasicBlock::RpoNumber rpo) const;
+  GapInstruction* GetBlockStart(RpoNumber rpo) const;
 
   typedef InstructionDeque::const_iterator const_iterator;
   const_iterator begin() const { return instructions_.begin(); }
@@ -984,8 +1010,8 @@ class InstructionSequence FINAL : public ZoneObject {
 
   // Used by the instruction selector while adding instructions.
   int AddInstruction(Instruction* instr);
-  void StartBlock(BasicBlock::RpoNumber rpo);
-  void EndBlock(BasicBlock::RpoNumber rpo);
+  void StartBlock(RpoNumber rpo);
+  void EndBlock(RpoNumber rpo);
 
   int AddConstant(int virtual_register, Constant constant) {
     // TODO(titzer): allow RPO numbers as constants?
@@ -1030,7 +1056,7 @@ class InstructionSequence FINAL : public ZoneObject {
   FrameStateDescriptor* GetFrameStateDescriptor(StateId deoptimization_id);
   int GetFrameStateDescriptorCount();
 
-  BasicBlock::RpoNumber InputRpo(Instruction* instr, size_t index) {
+  RpoNumber InputRpo(Instruction* instr, size_t index) {
     InstructionOperand* operand = instr->InputAt(index);
     Constant constant = operand->IsImmediate() ? GetImmediate(operand->index())
                                                : GetConstant(operand->index());

src/compiler/jump-threading.cc

@@ -9,8 +9,6 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-typedef BasicBlock::RpoNumber RpoNumber;
-
 #define TRACE(x) \
   if (FLAG_trace_turbo_jt) PrintF x
 
@@ -70,8 +68,8 @@ bool JumpThreading::ComputeForwarding(Zone* local_zone,
     while (!state.stack.empty()) {
       InstructionBlock* block = code->InstructionBlockAt(state.stack.top());
       // Process the instructions in a block up to a non-empty instruction.
-      TRACE(("jt [%d] B%d RPO%d\n", static_cast<int>(stack.size()),
-             block->id().ToInt(), block->rpo_number().ToInt()));
+      TRACE(("jt [%d] B%d\n", static_cast<int>(stack.size()),
+             block->rpo_number().ToInt()));
       bool fallthru = true;
       RpoNumber fw = block->rpo_number();
       for (int i = block->code_start(); i < block->code_end(); ++i) {
@@ -120,12 +118,10 @@ bool JumpThreading::ComputeForwarding(Zone* local_zone,
 
   if (FLAG_trace_turbo_jt) {
     for (int i = 0; i < static_cast<int>(result.size()); i++) {
-      TRACE(("RPO%d B%d ", i,
-             code->InstructionBlockAt(RpoNumber::FromInt(i))->id().ToInt()));
+      TRACE(("B%d ", i));
       int to = result[i].ToInt();
       if (i != to) {
-        TRACE(("-> B%d\n",
-               code->InstructionBlockAt(RpoNumber::FromInt(to))->id().ToInt()));
+        TRACE(("-> B%d\n", to));
       } else {
         TRACE(("\n"));
       }

src/compiler/jump-threading.h

@@ -17,13 +17,12 @@ class JumpThreading {
  public:
   // Compute the forwarding map of basic blocks to their ultimate destination.
   // Returns {true} if there is at least one block that is forwarded.
-  static bool ComputeForwarding(Zone* local_zone,
-                                ZoneVector<BasicBlock::RpoNumber>& result,
+  static bool ComputeForwarding(Zone* local_zone, ZoneVector<RpoNumber>& result,
                                 InstructionSequence* code);
 
   // Rewrite the instructions to forward jumps and branches.
   // May also negate some branches.
-  static void ApplyForwarding(ZoneVector<BasicBlock::RpoNumber>& forwarding,
+  static void ApplyForwarding(ZoneVector<RpoNumber>& forwarding,
                               InstructionSequence* code);
 };
 

src/compiler/mips/code-generator-mips.cc

@@ -803,7 +803,7 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
 }
 
 
-void CodeGenerator::AssembleArchJump(BasicBlock::RpoNumber target) {
+void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ Branch(GetLabel(target));
 }
 

src/compiler/mips64/code-generator-mips64.cc

@@ -917,7 +917,7 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
 }
 
 
-void CodeGenerator::AssembleArchJump(BasicBlock::RpoNumber target) {
+void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ Branch(GetLabel(target));
 }
 

src/compiler/pipeline.cc

@@ -746,7 +746,7 @@ struct JumpThreadingPhase {
   static const char* phase_name() { return "jump threading"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
-    ZoneVector<BasicBlock::RpoNumber> result(temp_zone);
+    ZoneVector<RpoNumber> result(temp_zone);
     if (JumpThreading::ComputeForwarding(temp_zone, result, data->sequence())) {
       JumpThreading::ApplyForwarding(result, data->sequence());
     }

src/compiler/ppc/code-generator-ppc.cc

@@ -1016,7 +1016,7 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
 }
 
 
-void CodeGenerator::AssembleArchJump(BasicBlock::RpoNumber target) {
+void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ b(GetLabel(target));
 }
 

src/compiler/register-allocator-verifier.cc

@@ -214,7 +214,7 @@ void RegisterAllocatorVerifier::CheckConstraint(
 
 namespace {
 
-typedef BasicBlock::RpoNumber Rpo;
+typedef RpoNumber Rpo;
 
 static const int kInvalidVreg = InstructionOperand::kInvalidVirtualRegister;
 

src/compiler/register-allocator.cc

@@ -1706,8 +1706,7 @@ void RegisterAllocator::BuildLiveRanges() {
   // Process the blocks in reverse order.
   for (int block_id = code()->InstructionBlockCount() - 1; block_id >= 0;
        --block_id) {
-    auto block =
-        code()->InstructionBlockAt(BasicBlock::RpoNumber::FromInt(block_id));
+    auto block = code()->InstructionBlockAt(RpoNumber::FromInt(block_id));
     auto live = ComputeLiveOut(block);
     // Initially consider all live_out values live for the entire block. We
     // will shorten these intervals if necessary.

src/compiler/schedule.cc

@@ -121,11 +121,6 @@ std::ostream& operator<<(std::ostream& os, const BasicBlock::Id& id) {
 }
 
 
-std::ostream& operator<<(std::ostream& os, const BasicBlock::RpoNumber& rpo) {
-  return os << rpo.ToSize();
-}
-
-
 Schedule::Schedule(Zone* zone, size_t node_count_hint)
     : zone_(zone),
       all_blocks_(zone),
@@ -319,14 +314,14 @@ void Schedule::SetBlockForNode(BasicBlock* block, Node* node) {
 
 std::ostream& operator<<(std::ostream& os, const Schedule& s) {
   for (BasicBlock* block : *s.rpo_order()) {
-    os << "--- BLOCK B" << block->id();
+    os << "--- BLOCK B" << block->rpo_number();
     if (block->deferred()) os << " (deferred)";
     if (block->PredecessorCount() != 0) os << " <- ";
     bool comma = false;
     for (BasicBlock const* predecessor : block->predecessors()) {
       if (comma) os << ", ";
       comma = true;
-      os << "B" << predecessor->id();
+      os << "B" << predecessor->rpo_number();
     }
     os << " ---\n";
     for (Node* node : *block) {
@@ -355,7 +350,7 @@ std::ostream& operator<<(std::ostream& os, const Schedule& s) {
       for (BasicBlock const* successor : block->successors()) {
         if (comma) os << ", ";
         comma = true;
-        os << "B" << successor->id();
+        os << "B" << successor->rpo_number();
       }
       os << "\n";
     }

src/compiler/schedule.h

@@ -51,35 +51,6 @@ class BasicBlock FINAL : public ZoneObject {
     size_t index_;
   };
 
-  static const int kInvalidRpoNumber = -1;
-  class RpoNumber FINAL {
-   public:
-    int ToInt() const {
-      DCHECK(IsValid());
-      return index_;
-    }
-    size_t ToSize() const {
-      DCHECK(IsValid());
-      return static_cast<size_t>(index_);
-    }
-    bool IsValid() const { return index_ >= 0; }
-    static RpoNumber FromInt(int index) { return RpoNumber(index); }
-    static RpoNumber Invalid() { return RpoNumber(kInvalidRpoNumber); }
-
-    bool IsNext(const RpoNumber other) const {
-      DCHECK(IsValid());
-      return other.index_ == this->index_ + 1;
-    }
-
-    bool operator==(RpoNumber other) const {
-      return this->index_ == other.index_;
-    }
-
-   private:
-    explicit RpoNumber(int32_t index) : index_(index) {}
-    int32_t index_;
-  };
-
   BasicBlock(Zone* zone, Id id);
 
   Id id() const { return id_; }
@@ -160,7 +131,6 @@ class BasicBlock FINAL : public ZoneObject {
   int32_t loop_number() const { return loop_number_; }
   void set_loop_number(int32_t loop_number) { loop_number_ = loop_number; }
 
-  RpoNumber GetRpoNumber() const { return RpoNumber::FromInt(rpo_number_); }
   int32_t rpo_number() const { return rpo_number_; }
   void set_rpo_number(int32_t rpo_number);
 
@@ -198,7 +168,6 @@ class BasicBlock FINAL : public ZoneObject {
 
 std::ostream& operator<<(std::ostream&, const BasicBlock::Control&);
 std::ostream& operator<<(std::ostream&, const BasicBlock::Id&);
-std::ostream& operator<<(std::ostream&, const BasicBlock::RpoNumber&);
 
 
 // A schedule represents the result of assigning nodes to basic blocks

src/compiler/verifier.cc

@@ -865,7 +865,7 @@ static void CheckInputsDominate(Schedule* schedule, BasicBlock* block,
                           use_pos)) {
       V8_Fatal(__FILE__, __LINE__,
                "Node #%d:%s in B%d is not dominated by input@%d #%d:%s",
-               node->id(), node->op()->mnemonic(), block->id().ToInt(), j,
+               node->id(), node->op()->mnemonic(), block->rpo_number(), j,
                input->id(), input->op()->mnemonic());
     }
   }
@@ -878,8 +878,8 @@ static void CheckInputsDominate(Schedule* schedule, BasicBlock* block,
     if (!Dominates(schedule, ctl, node)) {
       V8_Fatal(__FILE__, __LINE__,
                "Node #%d:%s in B%d is not dominated by control input #%d:%s",
-               node->id(), node->op()->mnemonic(), block->id(), ctl->id(),
-               ctl->op()->mnemonic());
+               node->id(), node->op()->mnemonic(), block->rpo_number(),
+               ctl->id(), ctl->op()->mnemonic());
     }
   }
 }
@@ -973,7 +973,7 @@ void ScheduleVerifier::Run(Schedule* schedule) {
       BasicBlock* idom = block->dominator();
       if (idom != NULL && !block_doms->Contains(idom->id().ToInt())) {
         V8_Fatal(__FILE__, __LINE__, "Block B%d is not dominated by B%d",
-                 block->id().ToInt(), idom->id().ToInt());
+                 block->rpo_number(), idom->rpo_number());
       }
       for (size_t s = 0; s < block->SuccessorCount(); s++) {
         BasicBlock* succ = block->SuccessorAt(s);
@@ -1011,7 +1011,7 @@ void ScheduleVerifier::Run(Schedule* schedule) {
             !dominators[idom->id().ToSize()]->Contains(dom->id().ToInt())) {
           V8_Fatal(__FILE__, __LINE__,
                    "Block B%d is not immediately dominated by B%d",
-                   block->id().ToInt(), idom->id().ToInt());
+                   block->rpo_number(), idom->rpo_number());
         }
       }
     }

src/compiler/x64/code-generator-x64.cc

@@ -1066,7 +1066,7 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
 }
 
 
-void CodeGenerator::AssembleArchJump(BasicBlock::RpoNumber target) {
+void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ jmp(GetLabel(target));
 }
 

test/cctest/compiler/test-instruction.cc

@@ -93,8 +93,12 @@ class InstructionTester : public HandleAndZoneScope {
     return UnallocatedOperand(UnallocatedOperand::ANY, vreg).Copy(zone());
   }
 
+  RpoNumber RpoFor(BasicBlock* block) {
+    return RpoNumber::FromInt(block->rpo_number());
+  }
+
   InstructionBlock* BlockAt(BasicBlock* block) {
-    return code->InstructionBlockAt(block->GetRpoNumber());
+    return code->InstructionBlockAt(RpoFor(block));
   }
   BasicBlock* GetBasicBlock(int instruction_index) {
     const InstructionBlock* block =
@@ -131,7 +135,6 @@ TEST(InstructionBasic) {
 
   for (auto block : *blocks) {
     CHECK_EQ(block->rpo_number(), R.BlockAt(block)->rpo_number().ToInt());
-    CHECK_EQ(block->id().ToInt(), R.BlockAt(block)->id().ToInt());
     CHECK(!block->loop_end());
   }
 }
@@ -151,23 +154,23 @@ TEST(InstructionGetBasicBlock) {
 
   R.allocCode();
 
-  R.code->StartBlock(b0->GetRpoNumber());
+  R.code->StartBlock(R.RpoFor(b0));
   int i0 = R.NewInstr();
   int i1 = R.NewInstr();
-  R.code->EndBlock(b0->GetRpoNumber());
-  R.code->StartBlock(b1->GetRpoNumber());
+  R.code->EndBlock(R.RpoFor(b0));
+  R.code->StartBlock(R.RpoFor(b1));
   int i2 = R.NewInstr();
   int i3 = R.NewInstr();
   int i4 = R.NewInstr();
   int i5 = R.NewInstr();
-  R.code->EndBlock(b1->GetRpoNumber());
-  R.code->StartBlock(b2->GetRpoNumber());
+  R.code->EndBlock(R.RpoFor(b1));
+  R.code->StartBlock(R.RpoFor(b2));
   int i6 = R.NewInstr();
   int i7 = R.NewInstr();
   int i8 = R.NewInstr();
-  R.code->EndBlock(b2->GetRpoNumber());
-  R.code->StartBlock(b3->GetRpoNumber());
-  R.code->EndBlock(b3->GetRpoNumber());
+  R.code->EndBlock(R.RpoFor(b2));
+  R.code->StartBlock(R.RpoFor(b3));
+  R.code->EndBlock(R.RpoFor(b3));
 
   CHECK_EQ(b0, R.GetBasicBlock(i0));
   CHECK_EQ(b0, R.GetBasicBlock(i1));
@@ -204,10 +207,10 @@ TEST(InstructionIsGapAt) {
   R.allocCode();
   TestInstr* i0 = TestInstr::New(R.zone(), 100);
   TestInstr* g = TestInstr::New(R.zone(), 103)->MarkAsControl();
-  R.code->StartBlock(b0->GetRpoNumber());
+  R.code->StartBlock(R.RpoFor(b0));
   R.code->AddInstruction(i0);
   R.code->AddInstruction(g);
-  R.code->EndBlock(b0->GetRpoNumber());
+  R.code->EndBlock(R.RpoFor(b0));
 
   CHECK(R.code->instructions().size() == 4);
   for (size_t i = 0; i < R.code->instructions().size(); ++i) {
@@ -227,17 +230,17 @@ TEST(InstructionIsGapAt2) {
   R.allocCode();
   TestInstr* i0 = TestInstr::New(R.zone(), 100);
   TestInstr* g = TestInstr::New(R.zone(), 103)->MarkAsControl();
-  R.code->StartBlock(b0->GetRpoNumber());
+  R.code->StartBlock(R.RpoFor(b0));
   R.code->AddInstruction(i0);
   R.code->AddInstruction(g);
-  R.code->EndBlock(b0->GetRpoNumber());
+  R.code->EndBlock(R.RpoFor(b0));
 
   TestInstr* i1 = TestInstr::New(R.zone(), 102);
   TestInstr* g1 = TestInstr::New(R.zone(), 104)->MarkAsControl();
-  R.code->StartBlock(b1->GetRpoNumber());
+  R.code->StartBlock(R.RpoFor(b1));
   R.code->AddInstruction(i1);
   R.code->AddInstruction(g1);
-  R.code->EndBlock(b1->GetRpoNumber());
+  R.code->EndBlock(R.RpoFor(b1));
 
   CHECK(R.code->instructions().size() == 8);
   for (size_t i = 0; i < R.code->instructions().size(); ++i) {
@@ -255,10 +258,10 @@ TEST(InstructionAddGapMove) {
   R.allocCode();
   TestInstr* i0 = TestInstr::New(R.zone(), 100);
   TestInstr* g = TestInstr::New(R.zone(), 103)->MarkAsControl();
-  R.code->StartBlock(b0->GetRpoNumber());
+  R.code->StartBlock(R.RpoFor(b0));
   R.code->AddInstruction(i0);
   R.code->AddInstruction(g);
-  R.code->EndBlock(b0->GetRpoNumber());
+  R.code->EndBlock(R.RpoFor(b0));
 
   CHECK(R.code->instructions().size() == 4);
   for (size_t i = 0; i < R.code->instructions().size(); ++i) {

test/cctest/compiler/test-jump-threading.cc

@@ -13,8 +13,6 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-typedef BasicBlock::RpoNumber RpoNumber;
-
 class TestCode : public HandleAndZoneScope {
  public:
   TestCode()
@@ -87,9 +85,9 @@ class TestCode : public HandleAndZoneScope {
   }
   void Start(bool deferred = false) {
     if (current_ == NULL) {
-      current_ = new (main_zone()) InstructionBlock(
-          main_zone(), BasicBlock::Id::FromInt(rpo_number_.ToInt()),
-          rpo_number_, RpoNumber::Invalid(), RpoNumber::Invalid(), deferred);
+      current_ = new (main_zone())
+          InstructionBlock(main_zone(), rpo_number_, RpoNumber::Invalid(),
+                           RpoNumber::Invalid(), deferred);
       blocks_.push_back(current_);
       sequence_.StartBlock(rpo_number_);
     }

test/unittests/compiler/instruction-selector-unittest.cc

@@ -5,6 +5,7 @@
 #include "test/unittests/compiler/instruction-selector-unittest.h"
 
 #include "src/compiler/graph.h"
+#include "src/compiler/schedule.h"
 #include "src/flags.h"
 #include "test/unittests/compiler/compiler-test-utils.h"
 

test/unittests/compiler/instruction-sequence-unittest.cc

@@ -410,15 +410,14 @@ InstructionOperand InstructionSequenceTest::ConvertOutputOp(VReg vreg,
 
 InstructionBlock* InstructionSequenceTest::NewBlock() {
   CHECK(current_block_ == nullptr);
-  auto block_id = BasicBlock::Id::FromSize(instruction_blocks_.size());
-  Rpo rpo = Rpo::FromInt(block_id.ToInt());
+  Rpo rpo = Rpo::FromInt(static_cast<int>(instruction_blocks_.size()));
   Rpo loop_header = Rpo::Invalid();
   Rpo loop_end = Rpo::Invalid();
   if (!loop_blocks_.empty()) {
     auto& loop_data = loop_blocks_.back();
     // This is a loop header.
     if (!loop_data.loop_header_.IsValid()) {
-      loop_end = Rpo::FromInt(block_id.ToInt() + loop_data.expected_blocks_);
+      loop_end = Rpo::FromInt(rpo.ToInt() + loop_data.expected_blocks_);
       loop_data.expected_blocks_--;
       loop_data.loop_header_ = rpo;
     } else {
@@ -430,8 +429,8 @@ InstructionBlock* InstructionSequenceTest::NewBlock() {
     }
   }
   // Construct instruction block.
-  auto instruction_block = new (zone())
-      InstructionBlock(zone(), block_id, rpo, loop_header, loop_end, false);
+  auto instruction_block =
+      new (zone()) InstructionBlock(zone(), rpo, loop_header, loop_end, false);
   instruction_blocks_.push_back(instruction_block);
   current_block_ = instruction_block;
   sequence()->StartBlock(rpo);

test/unittests/compiler/instruction-sequence-unittest.h

@@ -18,7 +18,7 @@ class InstructionSequenceTest : public TestWithIsolateAndZone {
   static const int kDefaultNRegs = 4;
   static const int kNoValue = kMinInt;
 
-  typedef BasicBlock::RpoNumber Rpo;
+  typedef RpoNumber Rpo;
 
   struct VReg {
     VReg() : value_(kNoValue) {}