[turbofan] Introduce dedicated CallFrequency class.

src/compiler/ast-graph-builder.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_AST_GRAPH_BUILDER_H_
 #define V8_COMPILER_AST_GRAPH_BUILDER_H_
 
 #include "src/ast/ast.h"
 #include "src/compiler/compiler-source-position-table.h"
 #include "src/compiler/js-graph.h"
@@ skipping 19 matching lines @@
 
 // The AstGraphBuilder produces a high-level IR graph, based on an
 // underlying AST. The produced graph can either be compiled into a
 // stand-alone function or be wired into another graph for the purposes
 // of function inlining.
 // This AstVistor is not final, and provides the AstVisitor methods as virtual
 // methods so they can be specialized by subclasses.
 class AstGraphBuilder : public AstVisitor<AstGraphBuilder> {
  public:
   AstGraphBuilder(Zone* local_zone, CompilationInfo* info, JSGraph* jsgraph,
-                  float invocation_frequency,
+                  CallFrequency invocation_frequency,
                   LoopAssignmentAnalysis* loop_assignment = nullptr);
   virtual ~AstGraphBuilder() {}
 
   // Creates a graph by visiting the entire AST.
   bool CreateGraph(bool stack_check = true);
 
   // Helpers to create new control nodes.
   Node* NewIfTrue() { return NewNode(common()->IfTrue()); }
   Node* NewIfFalse() { return NewNode(common()->IfFalse()); }
   Node* NewMerge() { return NewNode(common()->Merge(1), true); }
@@ skipping 20 matching lines @@
   class ControlScope;
   class ControlScopeForBreakable;
   class ControlScopeForIteration;
   class Environment;
   friend class ControlBuilder;
 
   Isolate* isolate_;
   Zone* local_zone_;
   CompilationInfo* info_;
   JSGraph* jsgraph_;
-  float const invocation_frequency_;
+  CallFrequency const invocation_frequency_;
   Environment* environment_;
   AstContext* ast_context_;
 
   // List of global declarations for functions and variables.
   ZoneVector<Handle<Object>> globals_;
 
   // Stack of control scopes currently entered by the visitor.
   ControlScope* execution_control_;
 
   // Stack of context objects pushed onto the chain by the visitor.
@@ skipping 150 matching lines @@
   // Computes local variable liveness and replaces dead variables in
   // frame states with the undefined values.
   void ClearNonLiveSlotsInFrameStates();
 
   Node** EnsureInputBufferSize(int size);
 
   // Named and keyed loads require a VectorSlotPair for successful lowering.
   VectorSlotPair CreateVectorSlotPair(FeedbackSlot slot) const;
 
   // Computes the frequency for JSCall and JSConstruct nodes.
-  float ComputeCallFrequency(FeedbackSlot slot) const;
+  CallFrequency ComputeCallFrequency(FeedbackSlot slot) const;
 
   // ===========================================================================
   // The following build methods all generate graph fragments and return one
   // resulting node. The operand stack height remains the same, variables and
   // other dependencies tracked by the environment might be mutated though.
 
   // Builders to create local function, script and block contexts.
   Node* BuildLocalActivationContext(Node* context);
   Node* BuildLocalFunctionContext(Scope* scope);
   Node* BuildLocalScriptContext(Scope* scope);
@@ skipping 289 matching lines @@
   bool IsLivenessBlockConsistent();
 
   // Prepare environment to be used as loop header.
   void PrepareForLoop(BitVector* assigned);
   void PrepareForOsrEntry();
 };
 
 class AstGraphBuilderWithPositions final : public AstGraphBuilder {
  public:
   AstGraphBuilderWithPositions(Zone* local_zone, CompilationInfo* info,
-                               JSGraph* jsgraph, float invocation_frequency,
+                               JSGraph* jsgraph,
+                               CallFrequency invocation_frequency,
                                LoopAssignmentAnalysis* loop_assignment,
                                SourcePositionTable* source_positions,
                                int inlining_id = SourcePosition::kNotInlined);
 
   bool CreateGraph(bool stack_check = true) {
     SourcePositionTable::Scope pos_scope(source_positions_, start_position_);
     return AstGraphBuilder::CreateGraph(stack_check);
   }
 
 #define DEF_VISIT(type)                                                  \
   void Visit##type(type* node) override {                                \
     SourcePositionTable::Scope pos(                                      \
         source_positions_,                                               \
         SourcePosition(node->position(), start_position_.InliningId())); \
     AstGraphBuilder::Visit##type(node);                                  \
   }
   AST_NODE_LIST(DEF_VISIT)
 #undef DEF_VISIT
 
  private:
   SourcePositionTable* const source_positions_;
   SourcePosition const start_position_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_AST_GRAPH_BUILDER_H_