Line data    Source code

       1             : // Copyright 2017 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #include "src/debug/debug-type-profile.h"
       6             : 
       7             : #include "src/feedback-vector.h"
       8             : #include "src/isolate.h"
       9             : #include "src/objects-inl.h"
      10             : #include "src/objects.h"
      11             : 
      12             : namespace v8 {
      13             : namespace internal {
      14             : 
      15          40 : std::unique_ptr<TypeProfile> TypeProfile::Collect(Isolate* isolate) {
      16          40 :   std::unique_ptr<TypeProfile> result(new TypeProfile());
      17             : 
      18             :   // Feedback vectors are already listed to prevent losing them to GC.
      19             :   DCHECK(isolate->factory()
      20             :              ->feedback_vectors_for_profiling_tools()
      21             :              ->IsArrayList());
      22             :   Handle<ArrayList> list = Handle<ArrayList>::cast(
      23             :       isolate->factory()->feedback_vectors_for_profiling_tools());
      24             : 
      25          40 :   Script::Iterator scripts(isolate);
      26             : 
      27         520 :   for (Script script = scripts.Next(); !script.is_null();
      28             :        script = scripts.Next()) {
      29         220 :     if (!script->IsUserJavaScript()) {
      30         120 :       continue;
      31             :     }
      32             : 
      33             :     Handle<Script> script_handle(script, isolate);
      34             : 
      35             :     TypeProfileScript type_profile_script(script_handle);
      36             :     std::vector<TypeProfileEntry>* entries = &type_profile_script.entries;
      37             : 
      38             :     // TODO(franzih): Sort the vectors by script first instead of iterating
      39             :     // the list multiple times.
      40        1072 :     for (int i = 0; i < list->Length(); i++) {
      41         972 :       FeedbackVector vector = FeedbackVector::cast(list->Get(i));
      42         972 :       SharedFunctionInfo info = vector->shared_function_info();
      43             :       DCHECK(info->IsSubjectToDebugging());
      44             : 
      45             :       // Match vectors with script.
      46        1944 :       if (script != info->script()) {
      47         864 :         continue;
      48             :       }
      49         660 :       if (!info->HasFeedbackMetadata() ||
      50         416 :           info->feedback_metadata()->is_empty() ||
      51         416 :           !info->feedback_metadata()->HasTypeProfileSlot()) {
      52             :         continue;
      53             :       }
      54         108 :       FeedbackSlot slot = vector->GetTypeProfileSlot();
      55             :       FeedbackNexus nexus(vector, slot);
      56         108 :       Handle<String> name(info->DebugName(), isolate);
      57         108 :       std::vector<int> source_positions = nexus.GetSourcePositions();
      58         256 :       for (int position : source_positions) {
      59             :         DCHECK_GE(position, 0);
      60         296 :         entries->emplace_back(position, nexus.GetTypesForSourcePositions(
      61         148 :                                             static_cast<uint32_t>(position)));
      62             :       }
      63             : 
      64             :       // Releases type profile data collected so far.
      65         108 :       nexus.ResetTypeProfile();
      66             :     }
      67         100 :     if (!entries->empty()) {
      68          32 :       result->emplace_back(type_profile_script);
      69             :     }
      70             :   }
      71          40 :   return result;
      72             : }
      73             : 
      74         100 : void TypeProfile::SelectMode(Isolate* isolate, debug::TypeProfileMode mode) {
      75             :   HandleScope handle_scope(isolate);
      76             : 
      77         100 :   if (mode == debug::TypeProfileMode::kNone) {
      78          48 :     if (!isolate->factory()
      79             :              ->feedback_vectors_for_profiling_tools()
      80             :              ->IsUndefined(isolate)) {
      81             :       // Release type profile data collected so far.
      82             : 
      83             :       // Feedback vectors are already listed to prevent losing them to GC.
      84             :       DCHECK(isolate->factory()
      85             :                  ->feedback_vectors_for_profiling_tools()
      86             :                  ->IsArrayList());
      87             :       Handle<ArrayList> list = Handle<ArrayList>::cast(
      88             :           isolate->factory()->feedback_vectors_for_profiling_tools());
      89             : 
      90         552 :       for (int i = 0; i < list->Length(); i++) {
      91         256 :         FeedbackVector vector = FeedbackVector::cast(list->Get(i));
      92             :         SharedFunctionInfo info = vector->shared_function_info();
      93             :         DCHECK(info->IsSubjectToDebugging());
      94         256 :         if (info->feedback_metadata()->HasTypeProfileSlot()) {
      95         104 :           FeedbackSlot slot = vector->GetTypeProfileSlot();
      96             :           FeedbackNexus nexus(vector, slot);
      97         104 :           nexus.ResetTypeProfile();
      98             :         }
      99             :       }
     100             : 
     101             :       // Delete the feedback vectors from the list if they're not used by code
     102             :       // coverage.
     103          40 :       if (isolate->is_best_effort_code_coverage()) {
     104             :         isolate->SetFeedbackVectorsForProfilingTools(
     105          40 :             ReadOnlyRoots(isolate).undefined_value());
     106             :       }
     107             :     }
     108             :   } else {
     109             :     DCHECK_EQ(debug::TypeProfileMode::kCollect, mode);
     110          52 :     isolate->MaybeInitializeVectorListFromHeap();
     111             :   }
     112             :   isolate->set_type_profile_mode(mode);
     113         100 : }
     114             : 
     115             : }  // namespace internal
     116      122004 : }  // namespace v8