[debug] introduce precise binary code coverage.

src/api.cc

 // 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.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 9593 matching lines @@
     return ToApiHandle<String>(name);
   } else {
     // We do not expect this to fail. Change this if it does.
     i::Handle<i::String> cons = isolate->factory()->NewConsString(
         isolate->factory()->InternalizeUtf8String(entry->name_prefix()),
         name).ToHandleChecked();
     return ToApiHandle<String>(cons);
   }
 }
 
-int debug::Coverage::FunctionData::StartOffset() { return function_->start; }
-int debug::Coverage::FunctionData::EndOffset() { return function_->end; }
-uint32_t debug::Coverage::FunctionData::Count() { return function_->count; }
+int debug::Coverage::FunctionData::StartOffset() const {
+  return function_->start;
+}
+int debug::Coverage::FunctionData::EndOffset() const { return function_->end; }
+uint32_t debug::Coverage::FunctionData::Count() const {
+  return function_->count;
+}
 
-MaybeLocal<String> debug::Coverage::FunctionData::Name() {
+MaybeLocal<String> debug::Coverage::FunctionData::Name() const {
   return ToApiHandle<String>(function_->name);
 }
 
-Local<debug::Script> debug::Coverage::ScriptData::GetScript() {
+Local<debug::Script> debug::Coverage::ScriptData::GetScript() const {
   return ToApiHandle<debug::Script>(script_->script);
 }
 
-size_t debug::Coverage::ScriptData::FunctionCount() {
+size_t debug::Coverage::ScriptData::FunctionCount() const {
   return script_->functions.size();
 }
 
 debug::Coverage::FunctionData debug::Coverage::ScriptData::GetFunctionData(
-    size_t i) {
+    size_t i) const {
   return FunctionData(&script_->functions.at(i));
 }
 
 debug::Coverage::~Coverage() { delete coverage_; }
 
-size_t debug::Coverage::ScriptCount() { return coverage_->size(); }
+size_t debug::Coverage::ScriptCount() const { return coverage_->size(); }
 
-debug::Coverage::ScriptData debug::Coverage::GetScriptData(size_t i) {
+debug::Coverage::ScriptData debug::Coverage::GetScriptData(size_t i) const {
   return ScriptData(&coverage_->at(i));
 }
 
-debug::Coverage debug::Coverage::Collect(Isolate* isolate, bool reset_count) {
-  return Coverage(i::Coverage::Collect(reinterpret_cast<i::Isolate*>(isolate),
-                                       reset_count));
+debug::Coverage debug::Coverage::CollectPrecise(Isolate* isolate) {
+  return Coverage(
+      i::Coverage::CollectPrecise(reinterpret_cast<i::Isolate*>(isolate)));
+}
+
+debug::Coverage debug::Coverage::CollectBestEffort(Isolate* isolate) {
+  return Coverage(
+      i::Coverage::CollectBestEffort(reinterpret_cast<i::Isolate*>(isolate)));
 }
 
 void debug::Coverage::SelectMode(Isolate* isolate, debug::Coverage::Mode mode) {
   i::Coverage::SelectMode(reinterpret_cast<i::Isolate*>(isolate), mode);
 }
 
 const char* CpuProfileNode::GetFunctionNameStr() const {
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   return node->entry()->name();
 }
@@ skipping 654 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8