[インデックス 14175] ファイルの概要

このコミットは、Goランタイムの src/pkg/runtime/runtime.h ファイル内のコメントを更新し、extern register 変数 g (現在のゴルーチン) と m (現在のOSスレッド) の宣言に関する説明をより正確かつ詳細にしたものです。特に、これらの変数が異なるアーキテクチャでどのように扱われるか、およびリンカがコンパイラの出力に与える影響について明確化しています。

コミット

コミットハッシュ: 90ad6a2d111d10b60fd5b7f5d46fd224635d5024
Author: Nigel Tao nigeltao@golang.org
Date: Fri Oct 19 11:02:32 2012 +1100

コミットメッセージ:

runtime: update comment for the "extern register" variables g and m.

R=rsc, minux.ma, ality
CC=dave, golang-dev
https://golang.org/cl/6620050

GitHub上でのコミットページへのリンク

https://github.com/golang/go/commit/90ad6a2d111d10b60fd5b7f5d46fd224635d5024

元コミット内容

runtime: update comment for the "extern register" variables g and m.

R=rsc, minux.ma, ality
CC=dave, golang-dev
https://golang.org/cl/6620050

変更の背景

Goランタイムは、ゴルーチン（g）とOSスレッド（m）のポインタを非常に効率的にアクセスする必要があります。初期のGoコンパイラ（6c, 8cなど）は、これらのポインタを「extern register」という特殊なストレージクラスとして扱っていました。これは、特定のレジスタまたはスレッドローカルストレージ（TLS）をこれらの変数に割り当てることで、高速なアクセスを可能にするためのGo独自のメカニズムでした。

しかし、この「extern register」の動作は、アーキテクチャによって異なり、またリンカ（6lなど）がコンパイラの出力に対してさらにOS固有の変更を加える可能性がありました。元のコメントは、これらの複雑な詳細を十分に説明していませんでした。特に、x86アーキテクチャにおけるセグメントレジスタ（GSやFS）の使用や、リンカによるアドレスの書き換え（例: 0(GS)が-16(FS)に書き換えられる）といった具体的な挙動が不明瞭でした。

このコミットは、これらの重要な低レベルの詳細を明確にし、Goランタイムの内部動作を理解しようとする開発者や、将来のランタイムの変更に携わる人々にとって、より正確で包括的な情報を提供することを目的としています。

前提知識の解説

Goランタイムにおける `g` と `m`

Go言語は、軽量な並行処理の単位である「ゴルーチン (goroutine)」を採用しています。Goランタイムは、これらのゴルーチンをOSスレッドに多重化して実行します。この管理のために、Goランタイムは以下の2つの重要な構造体ポインタを内部的に保持しています。

g (goroutine): 現在実行中のゴルーチンを表す構造体へのポインタです。各ゴルーチンは独自のスタックを持ち、g ポインタを通じてそのゴルーチンの状態やコンテキストにアクセスできます。
m (machine/thread): 現在ゴルーチンを実行しているOSスレッド（マシン）を表す構造体へのポインタです。m は、OSスレッド固有の情報（例: スケジューラ、シグナルハンドラなど）を保持します。g は m を介してアクセスされることがよくあります（例: g.m）。

これらのポインタへの高速なアクセスは、Goスケジューラがゴルーチンの切り替えやコンテキストスイッチを効率的に行う上で極めて重要です。

`extern register`

「extern register」は、Goの初期のCコンパイラ（6c, 8cなど）が提供していた特殊なストレージクラスです。これは、特定の変数をCPUレジスタに割り当てるか、またはスレッドローカルストレージ（TLS）の特定のスロットに割り当てることをコンパイラに指示するためのGo独自の拡張機能でした。これにより、g や m のような頻繁にアクセスされる変数を非常に高速に読み書きすることが可能になります。

レジスタ割り当て: ARMアーキテクチャのように、実際にCPUレジスタに割り当てられる場合があります。
スレッドローカルストレージ（TLS）: x86アーキテクチャでは、セグメントレジスタ（GSやFS）を介してアクセスされるスレッドローカルストレージのスロットに割り当てられます。TLSは、各スレッドが独自のデータを持つことを可能にするメカニズムです。

Plan 9 コンパイラ (`6c`, `8c`)

Go言語の初期のツールチェインは、Bell LabsのPlan 9オペレーティングシステムに由来するコンパイラとリンカの影響を強く受けていました。

6c: 64ビットx86アーキテクチャ向けのCコンパイラ。
8c: 32ビットx86アーキテクチャ向けのCコンパイラ。

これらのコンパイラは、Goランタイムの一部（当時はCで書かれていた）をコンパイルするために使用されていました。Go 1.5以降、Goコンパイラ自体がGoで書かれるようになり（セルフホスティング）、これらのCコンパイラはGoの標準ビルドプロセスでは直接使用されなくなりましたが、Goのアセンブラ構文などにはPlan 9の影響が残っています。

`6l` リンカ

6l は、Goの初期のツールチェインにおける64ビットLinuxシステム向けのリンカでした。リンカは、コンパイラによって生成されたオブジェクトファイルを結合し、実行可能なバイナリを作成する役割を担います。

このコミットの文脈では、6l のようなリンカが、コンパイラが生成したコード（特にセグメントレジスタを介したTLSアクセス）に対して、OS固有の調整を行う可能性があることが言及されています。例えば、0(GS)（GSセグメントレジスタを基準としたオフセット0のアドレス）という表記が、Linux環境では-16(FS)（FSセグメントレジスタを基準としたオフセット-16のアドレス）に書き換えられるといった具体的な例が挙げられています。これは、OSがTLSを管理する方法の違いによるものです。

`zasmhdr` と `src/cmd/dist/buildruntime.c`

zasmhdr は、Goのビルドプロセスの一部として、アセンブリヘッダファイルを生成するための内部的なコマンドまたはメカニズムを指している可能性があります。src/cmd/dist/buildruntime.c は、Goランタイムのビルドに関連するCソースファイルであり、extern register の詳細がどのように処理されるかに関する情報が含まれている可能性があります。

技術的詳細

このコミットの技術的な核心は、Goランタイムが g と m ポインタをどのように効率的に管理し、アクセスするかという低レベルのメカニズムに関する正確なドキュメントを提供することにあります。

Goランタイムは、現在のゴルーチン (g) とOSスレッド (m) のポインタを、非常に高速にアクセスできる場所に保持する必要があります。これは、Goのスケジューラが頻繁にゴルーチンを切り替えるため、これらのポインタへのアクセスがパフォーマンスのボトルネックにならないようにするためです。

初期のGoコンパイラは、この目的のために「extern register」という特殊なキーワードを導入しました。これは、コンパイラに対して、これらの変数を特定のCPUレジスタに割り当てるか、またはスレッドローカルストレージ（TLS）の特定のスロットに割り当てるように指示するものです。

ARMアーキテクチャ: ARMでは、R10のような実際のCPUレジスタが g や m のポインタを保持するために使用されることがあります。コメントでは「allocated downwards from R10」とあり、これはレジスタを基準としたオフセットでデータが配置されることを示唆しています。
x86アーキテクチャ (32-bit): x86では、セグメントレジスタ（GS）を介したTLSが使用されます。元のコメントでは「allocated upwards from 0(GS)」とありましたが、更新されたコメントでは「a slot in thread-local storage indexed by a segment register」とより一般化されています。これは、GSレジスタがTLSセグメントのベースアドレスを指し、そこからのオフセットで g や m のデータが格納されることを意味します。
AMD64アーキテクチャ (64-bit): AMD64でもTLSが使用され、コメントでは「allocated downwards from R15」とありましたが、更新されたコメントではx86と同様に「a slot in thread-local storage indexed by a segment register」と一般化されています。

重要なのは、コンパイラが生成したコードが、リンカによってさらに変更される可能性があるという点です。特にLinux上の6lリンカは、0(GS)のようなTLSアクセス命令を-16(FS)のような別の形式に書き換えることがあります。これは、OSがTLSを実装する方法の違いを吸収するためです。このリンカによる書き換えは、Goランタイムの低レベルな動作を理解する上で重要な側面であり、更新されたコメントで明示的に言及されています。

また、GoプログラムにリンクされるすべてのCファイルが runtime.h をインクルードする必要があるという点も重要です。これは、Cコンパイラが g や m に割り当てられた専用のレジスタやTLSスロットを、他の用途で誤って使用しないようにするためです。Goコンパイラ自体は、これらの特殊な変数を認識し、適切に処理するように設計されています。

このコメントの更新は、Goランタイムの移植性、デバッグ、および将来の最適化において、これらの低レベルな実装の詳細がどれほど重要であるかを浮き彫りにしています。

コアとなるコードの変更箇所

--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -82,19 +82,18 @@ typedef struct	ParFor		ParFor;
 typedef struct	ParForThread	ParForThread;
 
 /*
- * per-cpu declaration.
- * "extern register" is a special storage class implemented by 6c, 8c, etc.
- * on machines with lots of registers, it allocates a register that will not be
- * used in generated code.  on the x86, it allocates a slot indexed by a
- * segment register.
+ * Per-CPU declaration.
  *
- * amd64: allocated downwards from R15
- * x86: allocated upwards from 0(GS)
- * arm: allocated downwards from R10
+ * "extern register" is a special storage class implemented by 6c, 8c, etc.
+ * On the ARM, it is an actual register; elsewhere it is a slot in thread-
+ * local storage indexed by a segment register. See zasmhdr in
+ * src/cmd/dist/buildruntime.c for details, and be aware that the linker may
+ * make further OS-specific changes to the compiler's output. For example,
+ * 6l/linux rewrites 0(GS) as -16(FS).
  *
- * every C file linked into a Go program must include runtime.h
- * so that the C compiler knows to avoid other uses of these registers.
- * the Go compilers know to avoid them.
+ * Every C file linked into a Go program must include runtime.h so that the
+ * C compiler (6c, 8c, etc.) knows to avoid other uses of these dedicated
+ * registers. The Go compiler (6g, 8g, etc.) knows to avoid them.
  */
 extern	register	G*	g;
 extern	register	M*	m;

コアとなるコードの解説

このコミットは、src/pkg/runtime/runtime.h ファイル内の g と m 変数の宣言に関するコメントを修正しています。

変更前:

/*
 * per-cpu declaration.
 * "extern register" is a special storage class implemented by 6c, 8c, etc.
 * on machines with lots of registers, it allocates a register that will not be
 * used in generated code.  on the x86, it allocates a slot indexed by a
 * segment register.
 *
 * amd64: allocated downwards from R15
 * x86: allocated upwards from 0(GS)
 * arm: allocated downwards from R10
 *
 * every C file linked into a Go program must include runtime.h
 * so that the C compiler knows to avoid other uses of these registers.
 * the Go compilers know to avoid them.
 */

変更後:

/*
 * Per-CPU declaration.
 *
 * "extern register" is a special storage class implemented by 6c, 8c, etc.
 * On the ARM, it is an actual register; elsewhere it is a slot in thread-
 * local storage indexed by a segment register. See zasmhdr in
 * src/cmd/dist/buildruntime.c for details, and be aware that the linker may
 * make further OS-specific changes to the compiler's output. For example,
 * 6l/linux rewrites 0(GS) as -16(FS).
 *
 * Every C file linked into a Go program must include runtime.h so that the
 * C compiler (6c, 8c, etc.) knows to avoid other uses of these dedicated
 * registers. The Go compiler (6g, 8g, etc.) knows to avoid them.
 */

具体的な変更点は以下の通りです。

per-cpu declaration. の変更:
- 変更前: per-cpu declaration. (小文字)
- 変更後: Per-CPU declaration. (大文字で始まり、より正式な表現に)
extern register の説明の明確化:
- 変更前は「on machines with lots of registers, it allocates a register that will not be used in generated code. on the x86, it allocates a slot indexed by a segment register.」と、レジスタが多いマシンとx86で分けて説明していました。
- 変更後は「On the ARM, it is an actual register; elsewhere it is a slot in thread-local storage indexed by a segment register.」と、ARMとそれ以外のアーキテクチャで明確に区別し、TLSの使用を強調しています。
アーキテクチャ固有の記述の削除と一般化:
- 変更前には「amd64: allocated downwards from R15」「x86: allocated upwards from 0(GS)」「arm: allocated downwards from R10」といった具体的なアーキテクチャ固有の割り当て方法が記述されていました。
- 変更後、これらの具体的な記述は削除され、より一般的な「thread-local storage indexed by a segment register」という表現に統一されました。これは、実装の詳細が変更される可能性や、リンカによる変換があることを考慮したものです。
リンカによる変更の明示的な言及:
- 変更前はリンカによる変更について言及がありませんでした。
- 変更後、「See zasmhdr in src/cmd/dist/buildruntime.c for details, and be aware that the linker may make further OS-specific changes to the compiler's output. For example, 6l/linux rewrites 0(GS) as -16(FS).」という文が追加されました。これは、zasmhdrというツールやbuildruntime.cを参照しつつ、6l/linuxリンカが0(GS)を-16(FS)に書き換えるという具体的な例を挙げることで、コンパイラ出力がリンカによってさらに変更される可能性があることを明確にしています。これは、Goランタイムの低レベルな動作を理解する上で非常に重要な情報です。
CコンパイラとGoコンパイラの役割の明確化:
- 変更前は「so that the C compiler knows to avoid other uses of these registers. the Go compilers know to avoid them.」と記述されていました。
- 変更後、「so that the C compiler (6c, 8c, etc.) knows to avoid other uses of these dedicated registers. The Go compiler (6g, 8g, etc.) knows to avoid them.」と、CコンパイラとGoコンパイラの具体的な名前（6c, 8c, 6g, 8g）を例示することで、それぞれの役割をより明確にしています。

これらの変更は、Goランタイムの低レベルな実装に関するドキュメントの正確性と詳細度を向上させ、特にextern registerの動作、TLSの利用、およびリンカによるコード変換の側面をより深く理解できるようにすることを目的としています。

関連リンク

Go runtime: g and m - https://go.dev/doc/articles/go-runtime-g-m (これは一般的な情報源であり、特定のコミットに関連するものではありませんが、gとmの概念を理解するのに役立ちます。)
Goの初期のコンパイラとツールチェインに関する議論 - [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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