[debug] change coverage API to use offset instead of line/column.

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 9531 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);
   }
 }
 
-debug::Coverage::FunctionData::FunctionData(i::CoverageFunction* function,
-                                            Local<debug::Script> script)
-    : function_(function) {
-  i::Handle<i::Script> i_script = v8::Utils::OpenHandle(*script);
-  i::Script::PositionInfo start;
-  i::Script::PositionInfo end;
-  i::Script::GetPositionInfo(i_script, function->start, &start,
-                             i::Script::WITH_OFFSET);
-  i::Script::GetPositionInfo(i_script, function->end, &end,
-                             i::Script::WITH_OFFSET);
-  start_ = Location(start.line, start.column);
-  end_ = Location(end.line, end.column);
-}
-
+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; }
 
 MaybeLocal<String> debug::Coverage::FunctionData::Name() {
   return ToApiHandle<String>(function_->name);
 }
 
 Local<debug::Script> debug::Coverage::ScriptData::GetScript() {
   return ToApiHandle<debug::Script>(script_->script);
 }
 
 size_t debug::Coverage::ScriptData::FunctionCount() {
   return script_->functions.size();
 }
 
 debug::Coverage::FunctionData debug::Coverage::ScriptData::GetFunctionData(
     size_t i) {
-  return FunctionData(&script_->functions.at(i), GetScript());
+  return FunctionData(&script_->functions.at(i));
 }
 
 debug::Coverage::~Coverage() { delete coverage_; }
 
 size_t debug::Coverage::ScriptCount() { return coverage_->size(); }
 
 debug::Coverage::ScriptData debug::Coverage::GetScriptData(size_t i) {
   return ScriptData(&coverage_->at(i));
 }
 
@@ skipping 667 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