[debug] introduce precise binary code coverage.

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <memory>
 #include <sstream>
@@ skipping 13440 matching lines @@
   Handle<String> script_source(String::cast(Script::cast(script())->source()));
   int start_pos = function_token_position();
   if (start_pos == kNoSourcePosition) start_pos = start_position();
   return isolate->factory()->NewSubString(script_source, start_pos,
                                           end_position());
 }
 
 bool SharedFunctionInfo::IsInlineable() {
   // Check that the function has a script associated with it.
   if (!script()->IsScript()) return false;
+  if (GetIsolate()->is_precise_binary_code_coverage() &&
+      !has_reported_binary_coverage()) {
+    // We may miss invocations if this function is inlined.
+    return false;
+  }
   return !optimization_disabled();
 }
 
-
 int SharedFunctionInfo::SourceSize() {
   return end_position() - start_position();
 }
 
 void JSFunction::CalculateInstanceSizeHelper(InstanceType instance_type,
                                              int requested_embedder_fields,
                                              int requested_in_object_properties,
                                              int* instance_size,
                                              int* in_object_properties) {
   int header_size = JSObject::GetHeaderSize(instance_type);
@@ skipping 6821 matching lines @@
       // depend on this.
       return DICTIONARY_ELEMENTS;
     }
     DCHECK_LE(kind, LAST_ELEMENTS_KIND);
     return kind;
   }
 }
 
 }  // namespace internal
 }  // namespace v8