src/codegen/pending-optimization-table.cc

// Copyright 2019 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/codegen/pending-optimization-table.h"

#include "src/base/flags.h"
#include "src/execution/isolate-inl.h"
#include "src/heap/heap-inl.h"
#include "src/objects/hash-table.h"
#include "src/objects/js-objects.h"

namespace v8 {
namespace internal {

void ManualOptimizationTable::MarkFunctionForManualOptimization(
    Isolate* isolate, DirectHandle<JSFunction> function,
    IsCompiledScope* is_compiled_scope) {
  DCHECK(v8_flags.allow_natives_syntax);
  DCHECK(is_compiled_scope->is_compiled());
  DCHECK(function->has_feedback_vector());

  DirectHandle<SharedFunctionInfo> shared_info(function->shared(), isolate);

  Handle<ObjectHashTable> table =
      IsUndefined(isolate->heap()->functions_marked_for_manual_optimization())
          ? ObjectHashTable::New(isolate, 1)
          : handle(Cast<ObjectHashTable>(
                       isolate->heap()
                           ->functions_marked_for_manual_optimization()),
                   isolate);
  // We want to keep the function's BytecodeArray alive as bytecode flushing
  // may otherwise delete it. However, we can't directly store a reference to
  // the BytecodeArray inside the hash table as the BytecodeArray lives in
  // trusted space (outside of the main pointer compression cage) when the
  // sandbox is enabled. So instead, we reference the BytecodeArray's
  // in-sandbox wrapper object.
  table = ObjectHashTable::Put(
      isolate, table, shared_info,
      direct_handle(shared_info->GetBytecodeArray(isolate)->wrapper(),
                    isolate));
  isolate->heap()->SetFunctionsMarkedForManualOptimization(*table);
}

bool ManualOptimizationTable::IsMarkedForManualOptimization(
    Isolate* isolate, Tagged<JSFunction> function) {
  DCHECK(v8_flags.allow_natives_syntax);

  DirectHandle<Object> table(
      isolate->heap()->functions_marked_for_manual_optimization(), isolate);
  DirectHandle<Object> entry(
      IsUndefined(*table) ? ReadOnlyRoots(isolate).the_hole_value()
                          : Cast<ObjectHashTable>(table)->Lookup(
                                direct_handle(function->shared(), isolate)),
      isolate);

  return !IsTheHole(*entry);
}

}  // namespace internal
}  // namespace v8