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[インデックス 1324] ファイルの概要

このコミットは、Go言語の初期のビルドシステムにおける、Perforceからの新規チェックアウト時に発生する競合状態（race condition）を修正するものです。具体的には、src/cmd/gc/Makefile内のsysimport.cのビルドルールが変更され、6gコンパイラがまだ利用できない状況でもビルドが正常に進行するように改善されています。

コミット

commit fa945d5bf887bb16b60ca3580bec10c739b524d5
Author: Russ Cox <rsc@golang.org>
Date:   Thu Dec 11 11:58:45 2008 -0800

    fix race with fresh perforce checkouts
    
    R=r
    DELTA=15  (9 added, 0 deleted, 6 changed)
    OCL=20977
    CL=20981

GitHub上でのコミットページへのリンク

https://github.com/golang/go/commit/fa945d5bf887bb16b60ca3580bec10c739b524d5

元コミット内容

--- a/src/cmd/gc/Makefile
+++ b/src/cmd/gc/Makefile
@@ -39,13 +39,22 @@ y.tab.h: $(YFILES)
 y.tab.c: y.tab.h
  	test -f y.tab.c && touch y.tab.c
  
+# the test here checks whether we have 6g at all.
+# if so, use it.  if not, just use the sysimport.c we have.
+# this happens on fresh perforce checkouts where
+# sysimport.c ends up with an older time stamp
+# than sys.go (or unsafe.go or mksys.c).
 sysimport.c:	sys.go unsafe.go mksys.c
-	gcc -o mksys mksys.c
-	6g sys.go
-	6g unsafe.go
-	./mksys sys >_sysimport.c &&\
-		./mksys unsafe >>_sysimport.c &&\
-		mv _sysimport.c sysimport.c
+	if test -x $(BIN)/6g; then \
+		gcc -o mksys mksys.c; \
+		6g sys.go; \
+		6g unsafe.go; \
+		./mksys sys >_sysimport.c && \
+		./mksys unsafe >>_sysimport.c && \
+		mv _sysimport.c sysimport.c; \
+	elif test -f sysimport.c; then \
+		touch sysimport.c; \
+	fi
  
 clean:
  	rm -f $(OFILES) *.6 enam.c 6.out a.out y.tab.h y.tab.c $(LIB) _sysimport.c

変更の背景

この変更は、Go言語のソースコードをPerforceバージョン管理システムから新規にチェックアウトした際に発生するビルドエラーを解決するために導入されました。問題の根源は、sysimport.cというファイルが、その依存関係であるsys.go、unsafe.go、mksys.cよりも古いタイムスタンプを持つ状態でチェックアウトされる可能性があったことにあります。

通常のmakeの動作では、ターゲットファイル（sysimport.c）のタイムスタンプが依存ファイルよりも古い場合、そのターゲットを再ビルドしようとします。しかし、Goのビルドプロセスはブートストラップ（自己コンパイル）の性質を持っており、初期段階ではGoコンパイラである6gがまだビルドされていない、あるいはパスが通っていない状態であることがあります。

このような状況でsysimport.cのビルドがトリガーされると、6gコマンドが見つからずにビルドが失敗し、Goのソースコード全体のコンパイルが中断されてしまうという競合状態が発生していました。このコミットは、6gが利用可能になる前にsysimport.cの不必要な再ビルドを回避し、ビルドプロセスがスムーズに進行できるようにするためのものです。

前提知識の解説

  • Go言語の初期ビルドシステム: Go言語は、そのコンパイラ自体がGoで書かれているため、ブートストラッププロセスが必要です。初期のGoコンパイラはC言語で書かれた6c, 6g, 6lなどのツールチェーンで構成されており、これらを使ってGoのソースコードをコンパイルしていました。6gはGoソースコードをコンパイルするコンパイラです。
  • Makefile: makeユーティリティが使用するビルド設定ファイルです。依存関係とそれらを解決するためのコマンドを定義します。makeはファイルのタイムスタンプを比較して、依存関係が変更された場合にのみターゲットを再ビルドします。
  • sysimport.c: Go言語のランタイムや標準ライブラリの一部をC言語から利用するためのインターフェースを提供するファイルの一つです。Goの内部構造やシステムコールへのアクセスをC言語側から行うために、mksysというツールによって生成されます。
  • mksys: sys.goやunsafe.goなどのGoソースファイルから、C言語でGoの内部構造や関数を呼び出すためのCヘッダファイルやCソースファイルを生成するツールです。このツール自体はC言語で書かれており、gccでコンパイルされます。
  • 6g: 初期Go言語のコンパイラの一つで、Goのソースコードをコンパイルしてオブジェクトファイルを生成します。
  • Perforce: 集中型バージョン管理システム（Centralized Version Control System, CVCS）の一つです。Gitのような分散型システムとは異なり、すべての変更履歴が中央サーバーに保存されます。新規チェックアウト時には、サーバーから最新のファイルがローカルに取得されますが、この際にファイルのタイムスタンプがサーバー上のタイムスタンプで設定されることがあります。
  • 競合状態 (Race Condition): 複数のプロセスやスレッドが共有リソースにアクセスする際に、その実行順序によって結果が変わってしまう状態を指します。このケースでは、makeがsysimport.cの再ビルドを試みるタイミングと、6gコンパイラが利用可能になるタイミングとの間に競合がありました。
  • touchコマンド: ファイルのアクセス時刻と更新時刻を現在時刻に更新するUNIXコマンドです。ファイルが存在しない場合は新しく作成します。この修正では、既存のファイルのタイムスタンプを更新することで、makeにそのファイルが最新であると「錯覚」させるために使われています。

技術的詳細

このコミットの核心は、src/cmd/gc/Makefile内のsysimport.cターゲットのビルドルールに条件分岐を導入した点です。

変更前は、sysimport.cのビルドルールは以下のようでした。

sysimport.c:	sys.go unsafe.go mksys.c
	gcc -o mksys mksys.c
	6g sys.go
	6g unsafe.go
	./mksys sys >_sysimport.c &&\
		./mksys unsafe >>_sysimport.c &&\
		mv _sysimport.c sysimport.c

これは、sysimport.cがsys.go、unsafe.go、mksys.cのいずれかよりも古い場合、常に以下のステップを実行します。

  1. mksys.cをgccでコンパイルしてmksys実行ファイルを生成。
  2. sys.goとunsafe.goを6gでコンパイル。
  3. mksysを実行して_sysimport.cを生成し、最終的にsysimport.cにリネーム。

問題は、Perforceの新規チェックアウト時にsysimport.cが古いタイムスタンプで取得され、かつ6gコンパイラがまだビルドされていない（またはパスが通っていない）状況でmakeが実行されると、ステップ2の6g sys.goでエラーが発生し、ビルドが停止してしまうことでした。

変更後は、以下の条件分岐が追加されました。

sysimport.c:	sys.go unsafe.go mksys.c
	if test -x $(BIN)/6g; then \
		# ... (元のビルドステップ) ...
	elif test -f sysimport.c; then \
		touch sysimport.c; \
	fi

この変更により、sysimport.cのビルドがトリガーされた際に、まず以下のチェックが行われます。

  1. if test -x $(BIN)/6g; then ...:

    • test -x $(BIN)/6gは、$(BIN)ディレクトリ（Goのバイナリが配置される場所）に6gという実行可能ファイルが存在するかどうかをチェックします。
    • もし6gが存在し、実行可能であれば、通常のsysimport.cのビルドプロセス（gccでmksysをビルドし、6gでGoファイルをコンパイルし、mksysでsysimport.cを生成する一連のステップ）が実行されます。これは、6gが利用可能であるため、sysimport.cを正しく再生成できる状況です。

  2. elif test -f sysimport.c; then touch sysimport.c; fi:

    • もし上記のif条件（6gが存在し、実行可能である）が偽であった場合、次にこのelif条件が評価されます。
    • test -f sysimport.cは、現在のディレクトリにsysimport.cというファイルが存在するかどうかをチェックします。
    • もしsysimport.cが存在すれば、touch sysimport.cコマンドが実行されます。このコマンドはsysimport.cの最終更新時刻を現在時刻に更新します。これにより、makeはsysimport.cがその依存関係よりも新しいと判断し、それ以上の再ビルドを試みなくなります。

このロジックにより、6gがまだ利用できない（ブートストラップの初期段階や新規チェックアウト直後でまだコンパイラがビルドされていない）状況でも、もしsysimport.cが既に存在していれば、不必要なビルドエラーを回避し、ビルドプロセスを続行させることができます。sysimport.cのタイムスタンプを更新することで、makeは一時的にこのファイルが最新であるとみなし、後続のビルドステップ（例えば6g自体のビルド）に進むことが可能になります。6gがビルドされた後、再度makeが実行されれば、必要に応じてsysimport.cは正しく再生成されることになります。

コアとなるコードの変更箇所

変更はsrc/cmd/gc/Makefileファイル内のsysimport.cターゲットのビルドルールに集中しています。

--- a/src/cmd/gc/Makefile
+++ b/src/cmd/gc/Makefile
@@ -39,13 +39,22 @@ y.tab.h: $(YFILES)
 y.tab.c: y.tab.h
  	test -f y.tab.c && touch y.tab.c
  
+# the test here checks whether we have 6g at all.
+# if so, use it.  if not, just use the sysimport.c we have.
+# this happens on fresh perforce checkouts where
+# sysimport.c ends up with an older time stamp
+# than sys.go (or unsafe.go or mksys.c).
 sysimport.c:	sys.go unsafe.go mksys.c
-	gcc -o mksys mksys.c
-	6g sys.go
-	6g unsafe.go
-	./mksys sys >_sysimport.c &&\
-		./mksys unsafe >>_sysimport.c &&\
-		mv _sysimport.c sysimport.c
+	if test -x $(BIN)/6g; then \
+		gcc -o mksys mksys.c; \
+		6g sys.go; \
+		6g unsafe.go; \
+		./mksys sys >_sysimport.c && \
+		./mksys unsafe >>_sysimport.c && \
+		mv _sysimport.c sysimport.c; \
+	elif test -f sysimport.c; then \
+		touch sysimport.c; \
+	fi
  
 clean:
  	rm -f $(OFILES) *.6 enam.c 6.out a.out y.tab.h y.tab.c $(LIB) _sysimport.c

具体的には、sysimport.c:で始まる行の下のビルドコマンドブロックが、if/elif条件文でラップされています。

コアとなるコードの解説

変更されたMakefileのルールは、Go言語のブートストラップビルドプロセスにおける堅牢性を高めるためのものです。

sysimport.c:	sys.go unsafe.go mksys.c
	if test -x $(BIN)/6g; then \
		gcc -o mksys mksys.c; \
		6g sys.go; \
		6g unsafe.go; \
		./mksys sys >_sysimport.c && \
		./mksys unsafe >>_sysimport.c && \
		mv _sysimport.c sysimport.c; \
	elif test -f sysimport.c; then \
		touch sysimport.c; \
	fi
  • sysimport.c: sys.go unsafe.go mksys.c: これはmakeの依存関係定義です。sysimport.cはsys.go、unsafe.go、mksys.cに依存していることを示します。これらのいずれかのファイルがsysimport.cよりも新しい場合、このルールが実行されます。
  • if test -x $(BIN)/6g; then \ ... fi:
    • test -x $(BIN)/6g: $(BIN)はGoのツールチェーンバイナリが置かれるディレクトリ（例: $GOROOT/bin）を指します。この条件は、Goコンパイラ6gが既にビルドされ、実行可能であるかをチェックします。
    • もし6gが利用可能であれば、その後のブロックが実行されます。これは、mksysをCコンパイラ（gcc）でビルドし、6gでsys.goとunsafe.goをコンパイルし、最後にmksysを使ってsysimport.cを生成するという、sysimport.cを完全に再ビルドする標準的な手順です。
  • elif test -f sysimport.c; then \ touch sysimport.c; \ fi:
    • if条件が偽（つまり6gがまだ利用できない）の場合にこのelifブロックが評価されます。
    • test -f sysimport.c: sysimport.cファイルが現在のディレクトリに存在するかどうかをチェックします。これは、Perforceなどからソースコードをチェックアウトした際に、sysimport.c自体は存在しているが、そのタイムスタンプが古いという状況を想定しています。
    • touch sysimport.c: もしsysimport.cが存在すれば、このコマンドが実行され、ファイルの最終更新時刻が現在時刻に更新されます。これにより、makeはsysimport.cが最新であると判断し、このビルドステップをスキップします。これは、6gがまだ利用できないためにsysimport.cを正しく再ビルドできない状況で、ビルドプロセスがエラーで停止するのを防ぐための「一時的な回避策」です。ビルドの次の段階で6gがビルドされ、その後のmake実行時にsysimport.cが本当に古ければ、正しく再ビルドされることが期待されます。

この修正は、Goの初期のビルドシステムが、まだ完全に自己ホストされていない（つまり、Goコンパイラ自体がGoで書かれていない）段階でのブートストラップの課題に対処するために重要でした。

関連リンク

  • Go言語の初期のツールチェーンに関する議論: 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