[TypeFeedbackVector] Root literal arrays in function literals slots

src/compiler.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/compiler.h"
 
 #include <algorithm>
 #include <memory>
 
 #include "src/asmjs/asm-js.h"
@@ skipping 579 matching lines @@
   return info->code();
 }
 
 MUST_USE_RESULT MaybeHandle<Code> GetCodeFromOptimizedCodeMap(
     Handle<JSFunction> function, BailoutId osr_ast_id) {
   RuntimeCallTimerScope runtimeTimer(
       function->GetIsolate(),
       &RuntimeCallStats::CompileGetFromOptimizedCodeMap);
   Handle<SharedFunctionInfo> shared(function->shared());
   DisallowHeapAllocation no_gc;
-  CodeAndLiterals cached = shared->SearchOptimizedCodeMap(
+  Code* code = shared->SearchOptimizedCodeMap(
       function->context()->native_context(), osr_ast_id);
-  if (cached.code != nullptr) {
+  if (code != nullptr) {
     // Caching of optimized code enabled and optimized code found.
-    if (cached.literals != nullptr) function->set_literals(cached.literals);
-    DCHECK(!cached.code->marked_for_deoptimization());
+    DCHECK(!code->marked_for_deoptimization());
     DCHECK(function->shared()->is_compiled());
-    return Handle<Code>(cached.code);
+    return Handle<Code>(code);
   }
   return MaybeHandle<Code>();
 }
 
 void InsertCodeIntoOptimizedCodeMap(CompilationInfo* info) {
   Handle<Code> code = info->code();
   if (code->kind() != Code::OPTIMIZED_FUNCTION) return;  // Nothing to do.
 
   // Function context specialization folds-in the function context,
   // so no sharing can occur.
   if (info->is_function_context_specializing()) return;
   // Frame specialization implies function context specialization.
   DCHECK(!info->is_frame_specializing());
 
   // TODO(4764): When compiling for OSR from bytecode, BailoutId might derive
   // from bytecode offset and overlap with actual BailoutId. No caching!
   if (info->is_osr() && info->is_optimizing_from_bytecode()) return;
 
   // Cache optimized context-specific code.
   Handle<JSFunction> function = info->closure();
   Handle<SharedFunctionInfo> shared(function->shared());
-  Handle<LiteralsArray> literals(function->literals());
   Handle<Context> native_context(function->context()->native_context());
   SharedFunctionInfo::AddToOptimizedCodeMap(shared, native_context, code,
-                                            literals, info->osr_ast_id());
+                                            info->osr_ast_id());
 }
 
 bool GetOptimizedCodeNow(CompilationJob* job) {
   CompilationInfo* info = job->info();
   Isolate* isolate = info->isolate();
 
   // Parsing is not required when optimizing from existing bytecode.
   if (!info->is_optimizing_from_bytecode()) {
     if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
     EnsureFeedbackMetadata(info);
@@ skipping 215 matching lines @@
   // 3) The code may have already been invalidated due to dependency change.
   // 4) Code generation may have failed.
   if (job->state() == CompilationJob::State::kReadyToFinalize) {
     if (shared->optimization_disabled()) {
       job->RetryOptimization(kOptimizationDisabled);
     } else if (info->dependencies()->HasAborted()) {
       job->RetryOptimization(kBailedOutDueToDependencyChange);
     } else if (job->FinalizeJob() == CompilationJob::SUCCEEDED) {
       job->RecordOptimizedCompilationStats();
       RecordFunctionCompilation(CodeEventListener::LAZY_COMPILE_TAG, info);
-      if (shared
-              ->SearchOptimizedCodeMap(info->context()->native_context(),
-                                       info->osr_ast_id())
-              .code == nullptr) {
+      if (shared->SearchOptimizedCodeMap(info->context()->native_context(),
+                                         info->osr_ast_id()) == nullptr) {
         InsertCodeIntoOptimizedCodeMap(info);
       }
       if (FLAG_trace_opt) {
         PrintF("[completed optimizing ");
         info->closure()->ShortPrint();
         PrintF("]\n");
       }
       info->closure()->ReplaceCode(*info->code());
       return CompilationJob::SUCCEEDED;
     }
@@ skipping 867 matching lines @@
 void Compiler::PostInstantiation(Handle<JSFunction> function,
                                  PretenureFlag pretenure) {
   Handle<SharedFunctionInfo> shared(function->shared());
 
   if (FLAG_always_opt && shared->allows_lazy_compilation() &&
       !function->shared()->HasAsmWasmData() &&
       function->shared()->is_compiled()) {
     function->MarkForOptimization();
   }
 
-  CodeAndLiterals cached = shared->SearchOptimizedCodeMap(
+  Code* code = shared->SearchOptimizedCodeMap(
       function->context()->native_context(), BailoutId::None());
-  if (cached.code != nullptr) {
+  if (code != nullptr) {
     // Caching of optimized code enabled and optimized code found.
-    DCHECK(!cached.code->marked_for_deoptimization());
+    DCHECK(!code->marked_for_deoptimization());
     DCHECK(function->shared()->is_compiled());
-    function->ReplaceCode(cached.code);
+    function->ReplaceCode(code);
   }
 
-  if (cached.literals != nullptr) {
-    DCHECK(shared->is_compiled());
-    function->set_literals(cached.literals);
-  } else if (shared->is_compiled()) {
+  if (shared->is_compiled()) {
     // TODO(mvstanton): pass pretenure flag to EnsureLiterals.
     JSFunction::EnsureLiterals(function);
   }
 }
 
 }  // namespace internal
 }  // namespace v8