Revert "Keep a canonical list of shared function infos."

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 "src/ast-numbering.h"
 #include "src/bootstrapper.h"
@@ skipping 997 matching lines @@
 
 
 void Compiler::CompileForLiveEdit(Handle<Script> script) {
   // TODO(635): support extensions.
   Zone zone;
   ParseInfo parse_info(&zone, script);
   CompilationInfo info(&parse_info);
   PostponeInterruptsScope postpone(info.isolate());
   VMState<COMPILER> state(info.isolate());
 
-  // Get rid of old list of shared function infos.
-  script->set_shared_function_infos(Smi::FromInt(0));
-
   info.parse_info()->set_global();
   if (!Parser::ParseStatic(info.parse_info())) return;
 
   LiveEditFunctionTracker tracker(info.isolate(), info.function());
   if (!CompileUnoptimizedCode(&info)) return;
   if (info.has_shared_info()) {
     Handle<ScopeInfo> scope_info =
         ScopeInfo::Create(info.isolate(), info.zone(), info.scope());
     info.shared_info()->set_scope_info(*scope_info);
   }
@@ skipping 40 matching lines @@
         // Eager parsing cannot benefit from cached data, and producing cached
         // data while parsing eagerly is not implemented.
         parse_info->set_cached_data(nullptr);
         parse_info->set_compile_options(ScriptCompiler::kNoCompileOptions);
       }
       if (!Parser::ParseStatic(parse_info)) {
         return Handle<SharedFunctionInfo>::null();
       }
     }
 
-    info->MarkAsNewScript();
-
     FunctionLiteral* lit = info->function();
     LiveEditFunctionTracker live_edit_tracker(isolate, lit);
 
     // Measure how long it takes to do the compilation; only take the
     // rest of the function into account to avoid overlap with the
     // parsing statistics.
     HistogramTimer* rate = info->is_eval()
           ? info->isolate()->counters()->compile_eval()
           : info->isolate()->counters()->compile();
     HistogramTimerScope timer(rate);
 
     // Compile the code.
     if (!CompileUnoptimizedCode(info)) {
       return Handle<SharedFunctionInfo>::null();
     }
 
     // Allocate function.
     DCHECK(!info->code().is_null());
     result = isolate->factory()->NewSharedFunctionInfo(
         lit->name(), lit->materialized_literal_count(), lit->kind(),
         info->code(),
         ScopeInfo::Create(info->isolate(), info->zone(), info->scope()),
         info->feedback_vector());
 
     DCHECK_EQ(RelocInfo::kNoPosition, lit->function_token_position());
     SharedFunctionInfo::InitFromFunctionLiteral(result, lit);
-    SharedFunctionInfo::SetScript(result, script);
+    result->set_script(*script);
     result->set_is_toplevel(true);
 
     Handle<String> script_name = script->name()->IsString()
         ? Handle<String>(String::cast(script->name()))
         : isolate->factory()->empty_string();
     Logger::LogEventsAndTags log_tag = info->is_eval()
         ? Logger::EVAL_TAG
         : Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script);
 
     PROFILE(isolate, CodeCreateEvent(
@@ skipping 209 matching lines @@
   parse_info->set_language_mode(
       static_cast<LanguageMode>(parse_info->language_mode() | language_mode));
 
   CompilationInfo compile_info(parse_info);
   // TODO(marja): FLAG_serialize_toplevel is not honoured and won't be; when the
   // real code caching lands, streaming needs to be adapted to use it.
   return CompileToplevel(&compile_info);
 }
 
 
-Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfo(
+Handle<SharedFunctionInfo> Compiler::BuildFunctionInfo(
     FunctionLiteral* literal, Handle<Script> script,
     CompilationInfo* outer_info) {
   // Precondition: code has been parsed and scopes have been analyzed.
-  MaybeHandle<SharedFunctionInfo> maybe_existing;
-  if (outer_info->is_new_script()) {
-    // There is no existing shared function info when compiling a new script.
-    DCHECK(script->FindSharedFunctionInfo(literal).is_null());
-  } else {
-    maybe_existing = script->FindSharedFunctionInfo(literal);
-  }
-  // We found an existing shared function info. If it's already compiled,
-  // don't worry about compiling it, and simply return it. If it's not yet
-  // compiled, continue to decide whether to eagerly compile.
-  Handle<SharedFunctionInfo> existing;
-  if (maybe_existing.ToHandle(&existing) && existing->is_compiled()) {
-    return existing;
-  }
-
   Zone zone;
   ParseInfo parse_info(&zone, script);
   CompilationInfo info(&parse_info);
   parse_info.set_literal(literal);
   parse_info.set_scope(literal->scope());
   parse_info.set_language_mode(literal->scope()->language_mode());
   if (outer_info->will_serialize()) info.PrepareForSerializing();
-  if (outer_info->is_new_script()) info.MarkAsNewScript();
 
   Isolate* isolate = info.isolate();
   Factory* factory = isolate->factory();
   LiveEditFunctionTracker live_edit_tracker(isolate, literal);
   // Determine if the function can be lazily compiled. This is necessary to
   // allow some of our builtin JS files to be lazily compiled. These
   // builtins cannot be handled lazily by the parser, since we have to know
   // if a function uses the special natives syntax, which is something the
   // parser records.
   // If the debugger requests compilation for break points, we cannot be
@@ skipping 33 matching lines @@
     DCHECK(!info.code().is_null());
     scope_info = ScopeInfo::Create(info.isolate(), info.zone(), info.scope());
     if (literal->should_eager_compile() &&
         literal->should_be_used_once_hint()) {
       info.code()->MarkToBeExecutedOnce(isolate);
     }
   } else {
     return Handle<SharedFunctionInfo>::null();
   }
 
-  if (maybe_existing.is_null()) {
-    // Create a shared function info object.
-    Handle<SharedFunctionInfo> result = factory->NewSharedFunctionInfo(
-        literal->name(), literal->materialized_literal_count(), literal->kind(),
-        info.code(), scope_info, info.feedback_vector());
+  // Create a shared function info object.
+  Handle<SharedFunctionInfo> result = factory->NewSharedFunctionInfo(
+      literal->name(), literal->materialized_literal_count(), literal->kind(),
+      info.code(), scope_info, info.feedback_vector());
 
-    SharedFunctionInfo::InitFromFunctionLiteral(result, literal);
-    SharedFunctionInfo::SetScript(result, script);
-    result->set_is_toplevel(false);
+  SharedFunctionInfo::InitFromFunctionLiteral(result, literal);
+  result->set_script(*script);
+  result->set_is_toplevel(false);
 
-    RecordFunctionCompilation(Logger::FUNCTION_TAG, &info, result);
-    result->set_allows_lazy_compilation(literal->AllowsLazyCompilation());
-    result->set_allows_lazy_compilation_without_context(allow_lazy_without_ctx);
+  RecordFunctionCompilation(Logger::FUNCTION_TAG, &info, result);
+  result->set_allows_lazy_compilation(literal->AllowsLazyCompilation());
+  result->set_allows_lazy_compilation_without_context(allow_lazy_without_ctx);
 
-    // Set the expected number of properties for instances and return
-    // the resulting function.
-    SetExpectedNofPropertiesFromEstimate(result,
-                                         literal->expected_property_count());
-    live_edit_tracker.RecordFunctionInfo(result, literal, info.zone());
-    return result;
-  } else {
-    // We may have additional data from compilation now.
-    DCHECK(!existing->is_compiled());
-    existing->ReplaceCode(*info.code());
-    existing->set_scope_info(*scope_info);
-    existing->set_feedback_vector(*info.feedback_vector());
-    return existing;
-  }
+  // Set the expected number of properties for instances and return
+  // the resulting function.
+  SetExpectedNofPropertiesFromEstimate(result,
+                                       literal->expected_property_count());
+  live_edit_tracker.RecordFunctionInfo(result, literal, info.zone());
+  return result;
 }
 
 
 MaybeHandle<Code> Compiler::GetOptimizedCode(Handle<JSFunction> function,
                                              Handle<Code> current_code,
                                              ConcurrencyMode mode,
                                              BailoutId osr_ast_id) {
   Handle<Code> cached_code;
   if (GetCodeFromOptimizedCodeMap(
           function, osr_ast_id).ToHandle(&cached_code)) {
@@ skipping 140 matching lines @@
 
 
 #if DEBUG
 void CompilationInfo::PrintAstForTesting() {
   PrintF("--- Source from AST ---\n%s\n",
          PrettyPrinter(isolate(), zone()).PrintProgram(function()));
 }
 #endif
 }  // namespace internal
 }  // namespace v8