[debug] refactor code coverage to use enum for mode.

src/isolate.h

 // Copyright 2012 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_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 
 #include "include/v8-debug.h"
 #include "src/allocation.h"
 #include "src/base/atomicops.h"
 #include "src/builtins/builtins.h"
 #include "src/contexts.h"
 #include "src/date.h"
+#include "src/debug/debug-interface.h"
 #include "src/execution.h"
 #include "src/frames.h"
 #include "src/futex-emulation.h"
 #include "src/global-handles.h"
 #include "src/handles.h"
 #include "src/heap/heap.h"
 #include "src/messages.h"
 #include "src/regexp/regexp-stack.h"
 #include "src/runtime/runtime.h"
 #include "src/zone/zone.h"
@@ skipping 388 matching lines @@
   V(PromiseRejectCallback, promise_reject_callback, nullptr)                  \
   V(const v8::StartupData*, snapshot_blob, nullptr)                           \
   V(int, code_and_metadata_size, 0)                                           \
   V(int, bytecode_and_metadata_size, 0)                                       \
   /* true if being profiled. Causes collection of extra compile info. */      \
   V(bool, is_profiling, false)                                                \
   /* true if a trace is being formatted through Error.prepareStackTrace. */   \
   V(bool, formatting_stack_trace, false)                                      \
   /* Perform side effect checks on function call and API callbacks. */        \
   V(bool, needs_side_effect_check, false)                                     \
+  /* Current code coverage mode */                                            \
+  V(debug::Coverage::Mode, code_coverage_mode, debug::Coverage::kBestEffort)  \
   ISOLATE_INIT_SIMULATOR_LIST(V)
 
 #define THREAD_LOCAL_TOP_ACCESSOR(type, name)                        \
   inline void set_##name(type v) { thread_local_top_.name##_ = v; }  \
   inline type name() const { return thread_local_top_.name##_; }
 
 #define THREAD_LOCAL_TOP_ADDRESS(type, name) \
   type* name##_address() { return &thread_local_top_.name##_; }
 
 
@@ skipping 533 matching lines @@
 
   bool IsDead() { return has_fatal_error_; }
   void SignalFatalError() { has_fatal_error_ = true; }
 
   bool use_crankshaft();
 
   bool initialized_from_snapshot() { return initialized_from_snapshot_; }
 
   bool NeedsSourcePositionsForProfiling() const;
 
-  bool IsCodeCoverageEnabled();
+  bool is_best_effort_code_coverage() const {
+    return code_coverage_mode() == debug::Coverage::kBestEffort;
+  }
+
+  bool is_precise_count_code_coverage() const {
+    return code_coverage_mode() == debug::Coverage::kPreciseCount;
+  }
+
   void SetCodeCoverageList(Object* value);
 
   double time_millis_since_init() {
     return heap_.MonotonicallyIncreasingTimeInMs() - time_millis_at_init_;
   }
 
   DateCache* date_cache() {
     return date_cache_;
   }
 
@@ skipping 771 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_