Reland "Remove redundant ParseInfo::scope_."

Original commit message:
> Remove redundant ParseInfo::scope_.
>
> This was always set to the literal's scope.
>
> (Additional change: mark getters as const.)
>
> R=adamk@chromium.org
> BUG=
>
> Review-Url: https://codereview.chromium.org/2216563003
> Cr-Commit-Position: refs/heads/master@{#38372}
> This was always set to the literal's scope.

TBR=adamk@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2216083003
Cr-Commit-Position: refs/heads/master@{#38393}

src/ast/scopes.cc

@@ -375,7 +375,6 @@ int Scope::num_parameters() const {
 
 bool Scope::Analyze(ParseInfo* info) {
   DCHECK(info->literal() != NULL);
-  DCHECK(info->scope() == NULL);
   DeclarationScope* scope = info->literal()->scope();
   DeclarationScope* top = scope;
 
@@ -403,7 +402,6 @@ bool Scope::Analyze(ParseInfo* info) {
   scope->CheckZones();
 #endif
 
-  info->set_scope(scope);
   return true;
 }
 

src/compiler.cc

@@ -1778,7 +1778,6 @@ Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfo(
   CompilationInfo info(&parse_info, Handle<JSFunction>::null());
   parse_info.set_literal(literal);
   parse_info.set_shared_info(result);
-  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_debug()) info.MarkAsDebug();

src/parsing/parser.cc

@@ -59,8 +59,7 @@ ParseInfo::ParseInfo(Zone* zone)
       cached_data_(nullptr),
       ast_value_factory_(nullptr),
       function_name_(nullptr),
-      literal_(nullptr),
-      scope_(nullptr) {}
+      literal_(nullptr) {}
 
 ParseInfo::ParseInfo(Zone* zone, Handle<JSFunction> function)
     : ParseInfo(zone, Handle<SharedFunctionInfo>(function->shared())) {

src/parsing/parser.h

@@ -40,7 +40,7 @@ class ParseInfo {
     ast_value_factory_ = nullptr;
   }
 
-  Zone* zone() { return zone_; }
+  Zone* zone() const { return zone_; }
 
 // Convenience accessor methods for flags.
 #define FLAG_ACCESSOR(flag, getter, setter)     \
@@ -73,14 +73,14 @@ class ParseInfo {
                                       : NO_PARSE_RESTRICTION;
   }
 
-  ScriptCompiler::ExternalSourceStream* source_stream() {
+  ScriptCompiler::ExternalSourceStream* source_stream() const {
     return source_stream_;
   }
   void set_source_stream(ScriptCompiler::ExternalSourceStream* source_stream) {
     source_stream_ = source_stream;
   }
 
-  ScriptCompiler::StreamedSource::Encoding source_stream_encoding() {
+  ScriptCompiler::StreamedSource::Encoding source_stream_encoding() const {
     return source_stream_encoding_;
   }
   void set_source_stream_encoding(
@@ -93,23 +93,25 @@ class ParseInfo {
     character_stream_ = character_stream;
   }
 
-  v8::Extension* extension() { return extension_; }
+  v8::Extension* extension() const { return extension_; }
   void set_extension(v8::Extension* extension) { extension_ = extension; }
 
-  ScriptData** cached_data() { return cached_data_; }
+  ScriptData** cached_data() const { return cached_data_; }
   void set_cached_data(ScriptData** cached_data) { cached_data_ = cached_data; }
 
-  ScriptCompiler::CompileOptions compile_options() { return compile_options_; }
+  ScriptCompiler::CompileOptions compile_options() const {
+    return compile_options_;
+  }
   void set_compile_options(ScriptCompiler::CompileOptions compile_options) {
     compile_options_ = compile_options;
   }
 
-  DeclarationScope* script_scope() { return script_scope_; }
+  DeclarationScope* script_scope() const { return script_scope_; }
   void set_script_scope(DeclarationScope* script_scope) {
     script_scope_ = script_scope;
   }
 
-  AstValueFactory* ast_value_factory() { return ast_value_factory_; }
+  AstValueFactory* ast_value_factory() const { return ast_value_factory_; }
   void set_ast_value_factory(AstValueFactory* ast_value_factory) {
     ast_value_factory_ = ast_value_factory;
   }
@@ -119,21 +121,20 @@ class ParseInfo {
     function_name_ = function_name;
   }
 
-  FunctionLiteral* literal() { return literal_; }
+  FunctionLiteral* literal() const { return literal_; }
   void set_literal(FunctionLiteral* literal) { literal_ = literal; }
 
-  DeclarationScope* scope() { return scope_; }
-  void set_scope(DeclarationScope* scope) { scope_ = scope; }
+  DeclarationScope* scope() const { return literal()->scope(); }
 
-  UnicodeCache* unicode_cache() { return unicode_cache_; }
+  UnicodeCache* unicode_cache() const { return unicode_cache_; }
   void set_unicode_cache(UnicodeCache* unicode_cache) {
     unicode_cache_ = unicode_cache;
   }
 
-  uintptr_t stack_limit() { return stack_limit_; }
+  uintptr_t stack_limit() const { return stack_limit_; }
   void set_stack_limit(uintptr_t stack_limit) { stack_limit_ = stack_limit; }
 
-  uint32_t hash_seed() { return hash_seed_; }
+  uint32_t hash_seed() const { return hash_seed_; }
   void set_hash_seed(uint32_t hash_seed) { hash_seed_ = hash_seed; }
 
   int compiler_hints() const { return compiler_hints_; }
@@ -159,10 +160,10 @@ class ParseInfo {
   //--------------------------------------------------------------------------
   // TODO(titzer): these should not be part of ParseInfo.
   //--------------------------------------------------------------------------
-  Isolate* isolate() { return isolate_; }
-  Handle<SharedFunctionInfo> shared_info() { return shared_; }
-  Handle<Script> script() { return script_; }
-  Handle<Context> context() { return context_; }
+  Isolate* isolate() const { return isolate_; }
+  Handle<SharedFunctionInfo> shared_info() const { return shared_; }
+  Handle<Script> script() const { return script_; }
+  Handle<Context> context() const { return context_; }
   void clear_script() { script_ = Handle<Script>::null(); }
   void set_isolate(Isolate* isolate) { isolate_ = isolate; }
   void set_shared_info(Handle<SharedFunctionInfo> shared) { shared_ = shared; }
@@ -170,7 +171,7 @@ class ParseInfo {
   void set_script(Handle<Script> script) { script_ = script; }
   //--------------------------------------------------------------------------
 
-  LanguageMode language_mode() {
+  LanguageMode language_mode() const {
     return construct_language_mode(is_strict_mode());
   }
   void set_language_mode(LanguageMode language_mode) {
@@ -185,7 +186,9 @@ class ParseInfo {
   }
 
 #ifdef DEBUG
-  bool script_is_native() { return script_->type() == Script::TYPE_NATIVE; }
+  bool script_is_native() const {
+    return script_->type() == Script::TYPE_NATIVE;
+  }
 #endif  // DEBUG
 
  private:
@@ -234,9 +237,8 @@ class ParseInfo {
   AstValueFactory* ast_value_factory_;  // used if available, otherwise new.
   const AstRawString* function_name_;
 
-  //----------- Outputs of parsing and scope analysis ------------------------
-  FunctionLiteral* literal_;  // produced by full parser.
-  DeclarationScope* scope_;   // produced by scope analysis.
+  //----------- Output of parsing and scope analysis ------------------------
+  FunctionLiteral* literal_;
 
   void SetFlag(Flag f) { flags_ |= f; }
   void SetFlag(Flag f, bool v) { flags_ = v ? flags_ | f : flags_ & ~f; }