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[インデックス 10685] ファイルの概要

このコミットは、Goコンパイラのフロントエンドにおけるいくつかのマイナーな変更を導入しています。これらの変更は、主に宣言処理、型チェック、AST (Abstract Syntax Tree) の走査、および型インポートのロジックを改善し、より堅牢で効率的なコンパイルプロセスを目的としています。コミットメッセージによると、これらの変更は元々インライン化に関連する大きな変更の一部でしたが、インライン化のロジックから独立して適用できるため、分離されました。

コミット

commit fc128403dcfc596da7c77251bab2ca5623a406a1
Author: Russ Cox <rsc@golang.org>
Date:   Fri Dec 9 08:03:51 2011 -0500

    gc: minor changes for inlining
    
    Copied from 5400043 since they stand alone from inlining.
    
    R=lvd
    CC=golang-dev
    https://golang.org/cl/5479046

GitHub上でのコミットページへのリンク

https://github.com/golang/go/commit/fc128403dcfc596da7c77251bab2ca5623a406a1

元コミット内容

このコミットは、Goコンパイラ (gc) の内部におけるいくつかの小さな修正と改善を含んでいます。主な目的は、コンパイラのインライン化機能に関連する準備作業、またはインライン化とは独立してコンパイラの堅牢性を高めることです。具体的には、以下のファイルが変更されています。

  • src/cmd/gc/dcl.c: 宣言処理に関する変更。
  • src/cmd/gc/typecheck.c: 型チェック処理に関する変更。
  • src/cmd/gc/walk.c: AST走査処理に関する変更。
  • src/pkg/exp/types/gcimporter.go: 型インポートに関する変更。

これらの変更は、コンパイラの異なるフェーズにまたがっており、それぞれが特定の内部ロジックの最適化やバグ修正に寄与しています。

変更の背景

このコミットの背景には、Goコンパイラの継続的な改善と最適化があります。特に、コミットメッセージに「inlining（インライン化）」というキーワードがあることから、関数インライン化の機能強化またはその前提となるコンパイラ内部の構造改善が意図されていると考えられます。

インライン化は、コンパイラが小さな関数呼び出しを、その関数の本体のコードで直接置き換える最適化手法です。これにより、関数呼び出しのオーバーヘッド（スタックフレームの作成、引数の渡し、戻り値の処理など）を削減し、プログラムの実行速度を向上させることができます。しかし、インライン化を正確かつ効率的に行うためには、コンパイラがコードの構造、型情報、および変数のスコープを正確に理解し、処理できる必要があります。

このコミットは、元々より大きなインライン化関連の変更セット（コミットハッシュ 5400043）の一部でしたが、これらの変更がインライン化のロジックから独立して機能するため、別のコミットとして切り出されました。これは、Gitのベストプラクティスに従い、各コミットを単一の論理的な変更に集中させることで、コードベースの履歴をより明確にし、レビューやデバッグを容易にするためです。

具体的には、関数引数の名前解決の効率化、型と名前の関連付けの強化、AST走査における初期化文の処理の統一、そして型インポートロジックの汎用化といった改善が含まれており、これらはコンパイラの全体的な健全性と将来的な最適化（インライン化を含む）の基盤を強化するものです。

前提知識の解説

このコミットを理解するためには、以下の前提知識が役立ちます。

  1. Goコンパイラ (gc) の構造:

    • Go言語の公式コンパイラは、主にC言語で書かれたgc（Go Compiler）と、Go言語で書かれたツール群から構成されます。
    • gcは、ソースコードを解析し、ASTを構築し、型チェックを行い、中間表現（IR）を生成し、最終的に機械語コードを生成する主要なコンポーネントです。
    • フロントエンド: 字句解析、構文解析、AST構築、型チェック、AST走査（walkフェーズ）などが含まれます。このコミットの変更は主にフロントエンドに集中しています。
    • AST (Abstract Syntax Tree): ソースコードの構造を木構造で表現したものです。コンパイラはASTを走査（walk）しながら、意味解析や最適化を行います。各ノードは、変数、関数呼び出し、演算子、制御構造などを表します。
    • Node構造体: Goコンパイラ内部でASTの各要素を表す基本的なデータ構造です。n->opはノードの種類（演算子、変数など）を示し、n->ninitはノードに関連付けられた初期化文のリストを示します。

  2. Go言語の型システムと宣言:

    • Goは静的型付け言語であり、すべての変数、関数、式には型があります。
    • コンパイラは、プログラムの正しさを保証するために厳密な型チェックを行います。
    • 宣言 (dcl.c) は、変数、関数、型などがプログラム内でどのように導入され、スコープが設定されるかを扱います。

  3. 関数インライン化:

    • コンパイラ最適化の一種で、小さな関数呼び出しをその関数の本体のコードで直接置き換えることで、呼び出しオーバーヘッドを削減します。
    • インライン化の決定は、関数のサイズ、呼び出し頻度、コンパイラのヒューリスティックに基づいて行われます。
    • インライン化を効果的に行うためには、コンパイラが関数の引数、戻り値、ローカル変数などの情報を正確に追跡できる必要があります。

  4. src/pkg/exp/typesパッケージ:

    • Goの標準ライブラリの一部として提供される、実験的な型チェッカーおよび型インポーターです。
    • これは、Goコンパイラ自体とは独立して、Goのソースコードから型情報を抽出したり、型チェックを行ったりするためのツールやライブラリを開発するために使用されます。例えば、IDEや静的解析ツールなどがこれを利用することがあります。
    • gcimporter.goは、gcコンパイラが生成するバイナリ形式の型情報を読み込み、exp/typesパッケージの内部表現に変換する役割を担います。

これらの知識を持つことで、コミットがGoコンパイラのどの部分に影響を与え、どのような目的で変更されたのかをより深く理解できます。

技術的詳細

このコミットは、Goコンパイラの複数のコンポーネントにわたる、細かではあるものの重要な技術的改善を含んでいます。

  1. src/cmd/gc/dcl.c における newname の最適化:

    • funcargs2 関数内で、関数引数や戻り値の宣言時にnewname(ft->nname->sym)の代わりにft->nnameを直接使用するように変更されました。
    • newnameは新しい名前オブジェクトを作成し、シンボルテーブルに登録する可能性があります。しかし、ft->nnameは既に存在する名前オブジェクトへの参照です。
    • この変更は、既に存在する名前オブジェクトを再利用することで、不要なオブジェクトの作成とシンボルテーブル操作を避けるための最適化です。これにより、コンパイラのメモリ使用量と実行時間の両方がわずかに改善される可能性があります。特に、多数の関数引数を持つ関数や、コンパイルされるコードベースが大きい場合に効果を発揮します。

  2. src/cmd/gc/typecheck.c における型と名前の関連付け:

    • typecheckfunc 関数内で、t->nname = n->nname;という行が追加されました。
    • nは現在型チェック中の関数を表すASTノードであり、n->nnameはその関数の名前を表すノードです。tはその関数の型を表すType構造体です。
    • この変更により、関数の型情報 (Type構造体) に、その関数の名前 (nname) が直接関連付けられるようになりました。これは、特にメソッドや名前付き関数型の場合に重要です。コンパイラの後のフェーズ（例えば、インライン化やコード生成）で、型情報から直接関数の名前を取得できるようになり、データの一貫性とアクセス効率が向上します。

  3. src/cmd/gc/walk.c における初期化文 (ninit) の処理の統一:

    • walkstmt 関数内で、OFOR (forループ) と OIF (if文) のケースからwalkstmtlist(n->ninit);の呼び出しが削除され、代わりにwalkstmtの冒頭に移動されました。
    • これにより、すべてのステートメントノード (n) に対して、その初期化文 (n->ninit) が、ステートメント本体が走査される前に一貫して処理されるようになりました。これは、初期化文が常に適切な順序で評価されることを保証するためのリファクタリングです。
    • さらに、walkexpr 関数内にもn->ninitを処理する新しいブロックが追加されました。式 (expr) も初期化文を持つ場合があり、この変更により、式の初期化文も走査され、親の初期化リストに連結されるようになりました。これは、複雑な式（例えば、複合リテラルや関数呼び出し）が持つ初期化ロジックが、コンパイル時に正しく組み込まれることを保証します。
    • ascompatee 関数におけるエラーメッセージの改善も行われました。yyerror("error in shape across %O", op);がyyerror("error in shape across %+H %O %+H", nl, op, nr);に変更され、エラー発生時に比較対象のノードリスト (nl, nr) が出力されるようになり、デバッグ情報が豊富になりました。

  4. src/pkg/exp/types/gcimporter.go における declare 関数の汎用化:

    • declare 関数は、パッケージスコープ内で名前付きオブジェクトを宣言する役割を担います。
    • 以前は、ast.Typ (型) の場合にのみ、既に宣言されているオブジェクトを検索して再利用する特別なロジックがありました。
    • この変更により、このロジックが汎用化され、ast.Typだけでなく、任意の種類のオブジェクト (ast.ObjKind) に対して、既にスコープ内に同じ名前のオブジェクトが存在するかどうかを確認し、存在すればそれを再利用するようになりました。
    • これにより、コードの重複が削減され、declare関数のロジックがよりシンプルで堅牢になりました。これは、型インポートプロセスにおけるオブジェクトの重複宣言を防ぎ、一貫性を保つ上で重要です。

これらの変更は、Goコンパイラの内部構造をよりクリーンにし、将来的な機能拡張や最適化（特にインライン化のような複雑な最適化）のための強固な基盤を築くことを目的としています。

コアとなるコードの変更箇所

このコミットにおけるコアとなるコードの変更箇所は以下の通りです。

src/cmd/gc/dcl.c

funcargs2関数内で、newname(ft->nname->sym)の呼び出しがft->nnameに置き換えられました。

--- a/src/cmd/gc/dcl.c
+++ b/src/cmd/gc/dcl.c
@@ -642,7 +642,7 @@ funcargs2(Type *t)
 		for(ft=getthisx(t)->type; ft; ft=ft->down) {
 			if(!ft->nname || !ft->nname->sym)
 				continue;
-			tn = newname(ft->nname->sym);
+			tn = ft->nname;  // no need for newname(ft->nname->sym)
 			tn->type = ft->type;
 			declare(tn, PPARAM);
 		}
@@ -651,7 +651,7 @@ funcargs2(Type *t)
 		for(ft=getinargx(t)->type; ft; ft=ft->down) {
 			if(!ft->nname || !ft->nname->sym)
 				continue;
-			tn = newname(ft->nname->sym);
+			tn = ft->nname;
 			tn->type = ft->type;
 			declare(tn, PPARAM);
 		}
@@ -660,7 +660,7 @@ funcargs2(Type *t)
 		for(ft=getoutargx(t)->type; ft; ft=ft->down) {
 			if(!ft->nname || !ft->nname->sym)
 				continue;
-			tn = newname(ft->nname->sym);
+			tn = ft->nname;
 			tn->type = ft->type;
 			declare(tn, PPARAMOUT);
 		}

src/cmd/gc/typecheck.c

typecheckfunc関数内で、t->nname = n->nname;が追加されました。

--- a/src/cmd/gc/typecheck.c
+++ b/src/cmd/gc/typecheck.c
@@ -2441,7 +2442,7 @@ typecheckfunc(Node *n)
 	if((t = n->nname->type) == T)
 		return;
 	n->type = t;
-
+	t->nname = n->nname;
 	rcvr = getthisx(t)->type;
 	if(rcvr != nil && n->shortname != N && !isblank(n->shortname))
 		addmethod(n->shortname->sym, t, 1);

src/cmd/gc/walk.c

walkstmt関数内で、OFORとOIFのninit走査が削除され、walkstmtの冒頭にwalkstmtlist(n->ninit);が追加されました。 walkexpr関数内で、n->ninitを処理する新しいブロックが追加されました。 ascompatee関数でエラーメッセージが変更されました。

--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -167,6 +167,8 @@ walkstmt(Node **np)
 
 	setlineno(n);
 
+	walkstmtlist(n->ninit);
+
 	switch(n->op) {
 	default:
 		if(n->op == ONAME)
@@ -243,7 +245,6 @@ walkstmt(Node **np)
 		break;
 
 	case OFOR:
-		walkstmtlist(n->ninit);
 		if(n->ntest != N) {
 			walkstmtlist(n->ntest->ninit);
 			init = n->ntest->ninit;
@@ -256,7 +257,6 @@ walkstmt(Node **np)
 		break;
 
 	case OIF:
-		walkstmtlist(n->ninit);
 		walkexpr(&n->ntest, &n->ninit);
 		walkstmtlist(n->nbody);
 		walkstmtlist(n->nelse);
@@ -384,6 +384,12 @@ walkexpr(Node **np, NodeList **init)
 		fatal("walkexpr init == &n->ninit");
 	}
 
+	if(n->ninit != nil) {
+		walkstmtlist(n->ninit);
+		*init = concat(*init, n->ninit);
+		n->ninit = nil;
+	}
+
 	// annoying case - not typechecked
 	if(n->op == OKEY) {
 		walkexpr(&n->left, init);
@@ -1229,7 +1235,7 @@ ascompatee(int op, NodeList *nl, NodeList *nr, NodeList **init)
 
 	// cannot happen: caller checked that lists had same length
 	if(ll || lr)
-		yyerror("error in shape across %O", op);
+		yyerror("error in shape across %+H %O %+H", nl, op, nr);
 	return nn;
 }

src/pkg/exp/types/gcimporter.go

declare関数内のロジックが汎用化されました。

--- a/src/pkg/exp/types/gcimporter.go
+++ b/src/pkg/exp/types/gcimporter.go
@@ -145,18 +145,14 @@ func GcImporter(imports map[string]*ast.Object, path string) (pkg *ast.Object, e
 
 // Declare inserts a named object of the given kind in scope.
 func (p *gcParser) declare(scope *ast.Scope, kind ast.ObjKind, name string) *ast.Object {
-\t// a type may have been declared before - if it exists
-\t// already in the respective package scope, return that
-\t// type
-\tif kind == ast.Typ {\n-\t\tif obj := scope.Lookup(name); obj != nil {\n-\t\t\tassert(obj.Kind == ast.Typ)\n-\t\t\treturn obj\n-\t\t}\n+\t// the object may have been imported before - if it exists
+\t// already in the respective package scope, return that object
+\tif obj := scope.Lookup(name); obj != nil {\n+\t\tassert(obj.Kind == kind)\n+\t\treturn obj
 \t}
 \n-\t// any other object must be a newly declared object -\n-\t// create it and insert it into the package scope
+\t// otherwise create a new object and insert it into the package scope
 \tobj := ast.NewObj(kind, name)
 \tif scope.Insert(obj) != nil {\n \t\tp.errorf("already declared: %v %s", kind, obj.Name)\n```

## コアとなるコードの解説

### `src/cmd/gc/dcl.c` の変更
`funcargs2`関数は、関数の引数やレシーバ、戻り値の型情報を処理し、それらに対応する名前を宣言する役割を担っています。変更前は、`newname(ft->nname->sym)`を使って新しい名前オブジェクトを作成していました。`ft->nname->sym`はシンボル（名前の文字列）を表します。しかし、`ft->nname`自体が既に名前オブジェクト（`Node`構造体）であるため、`newname`を呼び出して新しいオブジェクトを作成する必要はありませんでした。この変更は、既存の`Node`オブジェクトを直接再利用することで、不要なメモリ割り当てとシンボルテーブル操作を削減し、コンパイラの効率を向上させるためのものです。これは、コンパイラ内部の細かな最適化であり、パフォーマンスに寄与します。

### `src/cmd/gc/typecheck.c` の変更
`typecheckfunc`関数は、関数の型チェックを行う主要な部分です。追加された`t->nname = n->nname;`の行は、関数の型 (`t`) に、その関数のASTノード (`n`) が持つ名前ノード (`n->nname`) を直接関連付けています。
Go言語では、関数も型の一種であり、特にメソッドや名前付き関数型の場合、その型がどの関数名に対応するのかという情報が重要になります。この変更により、コンパイラの後のフェーズ（例えば、インライン化の候補を決定する際や、デバッグ情報生成時など）で、型情報から直接関数の名前を取得できるようになり、コンパイラ内部のデータ構造の一貫性とアクセス効率が向上します。これは、コンパイラがより正確な情報を保持し、複雑な最適化を可能にするための基盤となります。

### `src/cmd/gc/walk.c` の変更
このファイルは、ASTを走査し、意味解析や中間コード生成の準備を行う`walk`フェーズを担当します。
1.  **`ninit`処理の統一**: 以前は`OFOR`や`OIF`のような特定の制御構造の処理内で`ninit`（初期化文のリスト）を走査していましたが、この変更により、`walkstmt`関数の冒頭で`walkstmtlist(n->ninit);`が呼び出されるようになりました。これにより、すべてのステートメントノードの初期化文が、そのステートメント本体が処理される前に一貫して評価されることが保証されます。これは、初期化の順序に関する潜在的なバグを防ぎ、コンパイラのロジックを簡素化します。
2.  **`walkexpr`における`ninit`処理**: 式 (`expr`) も初期化文を持つ場合があります（例: `map[int]int{}`のような複合リテラル）。追加されたブロックは、式の`ninit`を走査し、その初期化文を親の初期化リスト (`*init`) に連結します。これにより、式に関連する初期化ロジックが、その式が評価される前に正しく実行されることが保証されます。これは、複雑な式のコンパイルにおける正確性を高めます。
3.  **エラーメッセージの改善**: `ascompatee`関数は、代入や比較の際に左右のオペランドの「形状」（構造）が一致するかどうかをチェックします。エラーメッセージに`nl`と`nr`（ノードリスト）が追加されたことで、エラー発生時にどのノードが形状不一致を引き起こしたのかがより明確になり、デバッグが容易になります。

これらの変更は、AST走査のロジックをより堅牢で予測可能にし、コンパイラがより複雑なGoの構文構造を正確に処理できるようにするためのものです。

### `src/pkg/exp/types/gcimporter.go` の変更
`gcimporter.go`は、`gc`コンパイラが生成した型情報を読み込み、`exp/types`パッケージの内部表現に変換する役割を担います。`declare`関数は、インポートされた型や変数などの名前付きオブジェクトをスコープに挿入します。
変更前は、`ast.Typ`（型）の場合にのみ、既に同じ名前の型がスコープに存在するかを確認し、存在すればそれを再利用する特別なロジックがありました。この変更により、このロジックが汎用化され、`ast.Typ`だけでなく、任意の種類のオブジェクト (`ast.ObjKind`) に対して、既にスコープ内に同じ名前のオブジェクトが存在するかを確認し、存在すればそれを再利用するようになりました。
これは、型インポートプロセスにおけるオブジェクトの重複宣言を防ぎ、一貫性を保つ上で重要です。例えば、異なるパッケージから同じ名前のオブジェクトがインポートされる場合でも、適切に既存のオブジェクトを再利用することで、内部データ構造の整合性を保ち、不必要なオブジェクトの作成を防ぎます。

## 関連リンク

-   Go言語の公式ドキュメント: [https://golang.org/doc/](https://golang.org/doc/)
-   Goコンパイラのソースコード: [https://github.com/golang/go/tree/master/src/cmd/compile](https://github.com/golang/go/tree/master/src/cmd/compile) (現在のコンパイラは`cmd/compile`にあります)
-   Go言語のインライン化に関する議論 (古いもの): [https://groups.google.com/g/golang-nuts/c/0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0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