[turbofan] Extend and streamline serialization.

- Trigger serialization for more objects, such as some root maps.
- Serialize more data for certain object kinds.
- Add macros for convenience.
- Mark a few functions as const.

R=jarin@chromium.org
Bug: v8:7790

Change-Id: Id39b97e93728c0b3d87d9546bdf68abd04496c05
Reviewed-on: https://chromium-review.googlesource.com/1158572Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54923}

src/compiler/js-heap-broker.h

@@ -157,7 +157,7 @@ class JSObjectRef : public HeapObjectRef {
 
   FixedArrayBaseRef elements() const;
   void EnsureElementsTenured();
-  ElementsKind GetElementsKind();
+  ElementsKind GetElementsKind() const;
 };
 
 struct SlackTrackingResult {
@@ -359,7 +359,7 @@ class SharedFunctionInfoRef : public HeapObjectRef {
   bool has_duplicate_parameters() const;
   int function_map_index() const;
   FunctionKind kind() const;
-  LanguageMode language_mode();
+  LanguageMode language_mode() const;
   bool native() const;
   bool HasBreakInfo() const;
   bool HasBuiltinId() const;

src/compiler/js-heap-copy-reducer.cc

@@ -28,10 +28,14 @@ Reduction JSHeapCopyReducer::Reduce(Node* node) {
       ObjectRef(broker(), HeapConstantOf(node->op()));
       break;
     }
-    case IrOpcode::kJSCreateFunctionContext: {
-      CreateFunctionContextParameters const& p =
-          CreateFunctionContextParametersOf(node->op());
-      ScopeInfoRef(broker(), p.scope_info());
+    case IrOpcode::kJSCreateArray: {
+      CreateArrayParameters const& p = CreateArrayParametersOf(node->op());
+      Handle<AllocationSite> site;
+      if (p.site().ToHandle(&site)) AllocationSiteRef(broker(), site);
+      break;
+    }
+    case IrOpcode::kJSCreateCatchContext: {
+      ScopeInfoRef(broker(), ScopeInfoOf(node->op()));
       break;
     }
     case IrOpcode::kJSCreateClosure: {
@@ -41,6 +45,12 @@ Reduction JSHeapCopyReducer::Reduce(Node* node) {
       HeapObjectRef(broker(), p.code());
       break;
     }
+    case IrOpcode::kJSCreateFunctionContext: {
+      CreateFunctionContextParameters const& p =
+          CreateFunctionContextParametersOf(node->op());
+      ScopeInfoRef(broker(), p.scope_info());
+      break;
+    }
     case IrOpcode::kJSLoadNamed:
     case IrOpcode::kJSStoreNamed: {
       NamedAccess const& p = NamedAccessOf(node->op());

src/objects-debug.cc

@@ -445,8 +445,7 @@ void FixedTypedArray<Traits>::FixedTypedArrayVerify(Isolate* isolate) {
   }
 }
 
-
-bool JSObject::ElementsAreSafeToExamine() {
+bool JSObject::ElementsAreSafeToExamine() const {
   // If a GC was caused while constructing this object, the elements
   // pointer may point to a one pointer filler map.
   return reinterpret_cast<Map*>(elements()) !=

src/objects-inl.h

@@ -2547,7 +2547,7 @@ SMI_ACCESSORS(JSMessageObject, start_position, kStartPositionOffset)
 SMI_ACCESSORS(JSMessageObject, end_position, kEndPositionOffset)
 SMI_ACCESSORS(JSMessageObject, error_level, kErrorLevelOffset)
 
-ElementsKind JSObject::GetElementsKind() {
+ElementsKind JSObject::GetElementsKind() const {
   ElementsKind kind = map()->elements_kind();
 #if VERIFY_HEAP && DEBUG
   FixedArrayBase* fixed_array =

src/objects.h

@@ -2265,7 +2265,7 @@ class JSObject: public JSReceiver {
   static inline void SetMapAndElements(Handle<JSObject> object,
                                        Handle<Map> map,
                                        Handle<FixedArrayBase> elements);
-  inline ElementsKind GetElementsKind();
+  inline ElementsKind GetElementsKind() const;
   ElementsAccessor* GetElementsAccessor();
   // Returns true if an object has elements of PACKED_SMI_ELEMENTS or
   // HOLEY_SMI_ELEMENTS ElementsKind.
@@ -2655,7 +2655,7 @@ class JSObject: public JSReceiver {
   // If a GC was caused while constructing this object, the elements pointer
   // may point to a one pointer filler map. The object won't be rooted, but
   // our heap verification code could stumble across it.
-  bool ElementsAreSafeToExamine();
+  bool ElementsAreSafeToExamine() const;
 #endif
 
   Object* SlowReverseLookup(Object* value);

src/objects/shared-function-info-inl.h

@@ -188,7 +188,7 @@ BailoutReason SharedFunctionInfo::disable_optimization_reason() const {
   return DisabledOptimizationReasonBits::decode(flags());
 }
 
-LanguageMode SharedFunctionInfo::language_mode() {
+LanguageMode SharedFunctionInfo::language_mode() const {
   STATIC_ASSERT(LanguageModeSize == 2);
   return construct_language_mode(IsStrictBit::decode(flags()));
 }

src/objects/shared-function-info.h

@@ -415,7 +415,7 @@ class SharedFunctionInfo : public HeapObject, public NeverReadOnlySpaceObject {
   DECL_BOOLEAN_ACCESSORS(allows_lazy_compilation)
 
   // Indicates the language mode.
-  inline LanguageMode language_mode();
+  inline LanguageMode language_mode() const;
   inline void set_language_mode(LanguageMode language_mode);
 
   // Indicates whether the source is implicitly wrapped in a function.