[turbofan] Hide escape analysis internals from interface.

This is pure refactoring that moves many internal details of the escape
analysis from the header into the compilation unit. The goal of this is
to simplify the interface for readability.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/1991723003
Cr-Commit-Position: refs/heads/master@{#36322}

src/compiler/escape-analysis.h

@@ -5,7 +5,6 @@
 #ifndef V8_COMPILER_ESCAPE_ANALYSIS_H_
 #define V8_COMPILER_ESCAPE_ANALYSIS_H_
 
-#include "src/base/flags.h"
 #include "src/compiler/graph.h"
 
 namespace v8 {
@@ -14,107 +13,16 @@ namespace compiler {
 
 // Forward declarations.
 class CommonOperatorBuilder;
-class EscapeAnalysis;
+class EscapeStatusAnalysis;
+class MergeCache;
 class VirtualState;
 class VirtualObject;
 
-// EscapeStatusAnalysis determines for each allocation whether it escapes.
-class EscapeStatusAnalysis {
- public:
-  typedef NodeId Alias;
-  ~EscapeStatusAnalysis();
-
-  enum Status {
-    kUnknown = 0u,
-    kTracked = 1u << 0,
-    kEscaped = 1u << 1,
-    kOnStack = 1u << 2,
-    kVisited = 1u << 3,
-    // A node is dangling, if it is a load of some kind, and does not have
-    // an effect successor.
-    kDanglingComputed = 1u << 4,
-    kDangling = 1u << 5,
-    // A node is is an effect branch point, if it has more than 2 non-dangling
-    // effect successors.
-    kBranchPointComputed = 1u << 6,
-    kBranchPoint = 1u << 7,
-    kInQueue = 1u << 8
-  };
-  typedef base::Flags<Status, uint16_t> StatusFlags;
-
-  void RunStatusAnalysis();
-
-  bool IsVirtual(Node* node);
-  bool IsEscaped(Node* node);
-  bool IsAllocation(Node* node);
-
-  bool IsInQueue(NodeId id);
-  void SetInQueue(NodeId id, bool on_stack);
-
-  void DebugPrint();
-
-  EscapeStatusAnalysis(EscapeAnalysis* object_analysis, Graph* graph,
-                       Zone* zone);
-  void EnqueueForStatusAnalysis(Node* node);
-  bool SetEscaped(Node* node);
-  bool IsEffectBranchPoint(Node* node);
-  bool IsDanglingEffectNode(Node* node);
-  void ResizeStatusVector();
-  size_t GetStatusVectorSize();
-  bool IsVirtual(NodeId id);
-
-  Graph* graph() const { return graph_; }
-  Zone* zone() const { return zone_; }
-  void AssignAliases();
-  Alias GetAlias(NodeId id) const { return aliases_[id]; }
-  const ZoneVector<Alias>& GetAliasMap() const { return aliases_; }
-  Alias AliasCount() const { return next_free_alias_; }
-  static const Alias kNotReachable;
-  static const Alias kUntrackable;
-
-  bool IsNotReachable(Node* node);
-
- private:
-  void Process(Node* node);
-  void ProcessAllocate(Node* node);
-  void ProcessFinishRegion(Node* node);
-  void ProcessStoreField(Node* node);
-  void ProcessStoreElement(Node* node);
-  bool CheckUsesForEscape(Node* node, bool phi_escaping = false) {
-    return CheckUsesForEscape(node, node, phi_escaping);
-  }
-  bool CheckUsesForEscape(Node* node, Node* rep, bool phi_escaping = false);
-  void RevisitUses(Node* node);
-  void RevisitInputs(Node* node);
-
-  Alias NextAlias() { return next_free_alias_++; }
-
-  bool HasEntry(Node* node);
-
-  bool IsAllocationPhi(Node* node);
-
-  ZoneVector<Node*> stack_;
-  EscapeAnalysis* object_analysis_;
-  Graph* const graph_;
-  Zone* const zone_;
-  ZoneVector<StatusFlags> status_;
-  Alias next_free_alias_;
-  ZoneVector<Node*> status_stack_;
-  ZoneVector<Alias> aliases_;
-
-  DISALLOW_COPY_AND_ASSIGN(EscapeStatusAnalysis);
-};
-
-DEFINE_OPERATORS_FOR_FLAGS(EscapeStatusAnalysis::StatusFlags)
-
-// Forward Declaration.
-class MergeCache;
-
 // EscapeObjectAnalysis simulates stores to determine values of loads if
 // an object is virtual and eliminated.
 class EscapeAnalysis {
  public:
-  using Alias = EscapeStatusAnalysis::Alias;
+  typedef NodeId Alias;
   EscapeAnalysis(Graph* graph, CommonOperatorBuilder* common, Zone* zone);
   ~EscapeAnalysis();
 
@@ -164,23 +72,16 @@ class EscapeAnalysis {
   void DebugPrintState(VirtualState* state);
   void DebugPrintObject(VirtualObject* state, Alias id);
 
-  Graph* graph() const { return status_analysis_.graph(); }
-  Zone* zone() const { return status_analysis_.zone(); }
+  Alias GetAlias(NodeId id) const;
+  Alias AliasCount() const;
+
+  Graph* graph() const;
+  Zone* zone() const { return zone_; }
   CommonOperatorBuilder* common() const { return common_; }
-  bool IsEffectBranchPoint(Node* node) {
-    return status_analysis_.IsEffectBranchPoint(node);
-  }
-  bool IsDanglingEffectNode(Node* node) {
-    return status_analysis_.IsDanglingEffectNode(node);
-  }
-  bool IsNotReachable(Node* node) {
-    return status_analysis_.IsNotReachable(node);
-  }
-  Alias GetAlias(NodeId id) const { return status_analysis_.GetAlias(id); }
-  Alias AliasCount() const { return status_analysis_.AliasCount(); }
-
-  EscapeStatusAnalysis status_analysis_;
+
+  Zone* const zone_;
   CommonOperatorBuilder* const common_;
+  EscapeStatusAnalysis* status_analysis_;
   ZoneVector<VirtualState*> virtual_states_;
   ZoneVector<Node*> replacements_;
   MergeCache* cache_;