[inspector] extend protocol for code coverage.

src/debug/debug-interface.h

 // Copyright 2016 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_DEBUG_DEBUG_INTERFACE_H_
 #define V8_DEBUG_DEBUG_INTERFACE_H_
 
 #include <functional>
 
 #include "include/v8-debug.h"
 #include "include/v8-util.h"
 #include "include/v8.h"
 
 #include "src/debug/interface-types.h"
 #include "src/globals.h"
 
 namespace v8 {
 
 namespace internal {
-struct CoverageRange;
+struct CoverageFunction;
+struct CoverageScript;
 class Coverage;
 class Script;
 }
 
 namespace debug {
 
 /**
  * Debugger is running in its own context which is entered while debugger
  * messages are being dispatched. This is an explicit getter for this
  * debugger context. Note that the content of the debugger context is subject
@@ skipping 173 matching lines @@
   bool IsSuspended();
 
   static v8::Local<debug::GeneratorObject> Cast(v8::Local<v8::Value> value);
 };
 
 /*
  * Provide API layer between inspector and code coverage.
  */
 class V8_EXPORT_PRIVATE Coverage {
  public:
-  class V8_EXPORT_PRIVATE Range {
+  class ScriptData;  // Forward declaration.
+
+  class V8_EXPORT_PRIVATE FunctionData {
    public:
     // 0-based line and colum numbers.
     Location Start() { return start_; }
     Location End() { return end_; }
     uint32_t Count();
-    size_t NestedCount();
-    Range GetNested(size_t i);
     MaybeLocal<String> Name();
 
    private:
-    Range(i::CoverageRange* range, Local<debug::Script> script);
-    i::CoverageRange* range_;
+    FunctionData(i::CoverageFunction* function, Local<debug::Script> script);
+    i::CoverageFunction* function_;
     Location start_;
     Location end_;
-    Local<debug::Script> script_;
 
-    friend class debug::Coverage;
+    friend class v8::debug::Coverage::ScriptData;
   };
 
-  static Coverage Collect(Isolate* isolate);
+  class V8_EXPORT_PRIVATE ScriptData {
+   public:
+    Local<debug::Script> GetScript();
+    size_t FunctionCount();
+    FunctionData GetFunctionData(size_t i);
+
+   private:
+    explicit ScriptData(i::CoverageScript* script) : script_(script) {}
+    i::CoverageScript* script_;
+
+    friend class v8::debug::Coverage;
+  };
+
+  static Coverage Collect(Isolate* isolate, bool reset_count);
 
   static void TogglePrecise(Isolate* isolate, bool enable);
 
   size_t ScriptCount();
-  Local<debug::Script> GetScript(size_t i);
-  Range GetRange(size_t i);
+  ScriptData GetScriptData(size_t i);
+  bool IsEmpty() { return coverage_ == nullptr; }
 
   ~Coverage();
 
  private:
   explicit Coverage(i::Coverage* coverage) : coverage_(coverage) {}
   i::Coverage* coverage_;
 };
 }  // namespace debug
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_INTERFACE_H_