Reland: [Parse] ParseInfo owns the parsing Zone.

src/parsing/parse-info.h

 // Copyright 2016 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.
 
 #ifndef V8_PARSING_PARSE_INFO_H_
 #define V8_PARSING_PARSE_INFO_H_
 
+#include <memory>
+
 #include "include/v8.h"
 #include "src/globals.h"
 #include "src/handles.h"
 #include "src/parsing/preparsed-scope-data.h"
 
 namespace v8 {
 
 class Extension;
 
 namespace internal {
 
+class AccountingAllocator;
 class AstRawString;
 class AstValueFactory;
 class DeclarationScope;
 class FunctionLiteral;
 class ScriptData;
 class SharedFunctionInfo;
 class UnicodeCache;
 class Utf16CharacterStream;
 class Zone;
 
 // A container for the inputs, configuration options, and outputs of parsing.
 class V8_EXPORT_PRIVATE ParseInfo {
  public:
-  explicit ParseInfo(Zone* zone);
-  ParseInfo(Zone* zone, Handle<Script> script);
-  ParseInfo(Zone* zone, Handle<SharedFunctionInfo> shared);
+  explicit ParseInfo(AccountingAllocator* zone_allocator);
+  ParseInfo(Handle<Script> script);
+  ParseInfo(Handle<SharedFunctionInfo> shared);
+
+  // TODO(rmcilroy): Remove once Hydrogen no longer needs this.
+  ParseInfo(Handle<SharedFunctionInfo> shared, std::shared_ptr<Zone> zone);
 
   ~ParseInfo();
 
-  Zone* zone() const { return zone_; }
+  Zone* zone() const { return zone_.get(); }
+
+  std::shared_ptr<Zone> zone_shared() const { return zone_; }
 
 // Convenience accessor methods for flags.
 #define FLAG_ACCESSOR(flag, getter, setter)     \
   bool getter() const { return GetFlag(flag); } \
   void setter() { SetFlag(flag); }              \
   void setter(bool val) { SetFlag(flag, val); }
 
   FLAG_ACCESSOR(kToplevel, is_toplevel, set_toplevel)
   FLAG_ACCESSOR(kEval, is_eval, set_eval)
   FLAG_ACCESSOR(kStrictMode, is_strict_mode, set_strict_mode)
@@ skipping 170 matching lines @@
     kAllowLazyParsing = 1 << 7,
     kIsNamedExpression = 1 << 8,
     kCallsEval = 1 << 9,
     kDebug = 1 << 10,
     kSerializing = 1 << 11,
     // ---------- Output flags --------------------------
     kAstValueFactoryOwned = 1 << 12
   };
 
   //------------- Inputs to parsing and scope analysis -----------------------
-  Zone* zone_;
+  std::shared_ptr<Zone> zone_;
   unsigned flags_;
   ScriptCompiler::ExternalSourceStream* source_stream_;
   ScriptCompiler::StreamedSource::Encoding source_stream_encoding_;
   Utf16CharacterStream* character_stream_;
   v8::Extension* extension_;
   ScriptCompiler::CompileOptions compile_options_;
   DeclarationScope* script_scope_;
   DeclarationScope* asm_function_scope_;
   UnicodeCache* unicode_cache_;
   uintptr_t stack_limit_;
@@ skipping 21 matching lines @@
 
   void SetFlag(Flag f) { flags_ |= f; }
   void SetFlag(Flag f, bool v) { flags_ = v ? flags_ | f : flags_ & ~f; }
   bool GetFlag(Flag f) const { return (flags_ & f) != 0; }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSE_INFO_H_