[インデックス 1967] ファイルの概要

このコミットは、Goコンパイラのwalkstateフェーズ（具体的にはsrc/cmd/gc/walk.c内）で生成されるエラーが、正しい行番号を報告しない可能性があった問題を修正します。エラー報告に使用されるlineno変数が、現在処理中のASTノードの行番号で適切に更新されるようにします。

コミット

set line number for errors produced during walkstate.

R=ken
OCL=27145
CL=27145

GitHub上でのコミットページへのリンク

https://github.com/golang/go/commit/d50c70d2611f51f8894bc76c4b3f28537ad3b703

元コミット内容

set line number for errors produced during walkstate.

R=ken
OCL=27145
CL=27145

変更の背景

Goコンパイラの初期段階（このコミットが作成された2009年頃）では、コンパイラの大部分がC言語で書かれていました。コンパイルプロセスにおけるwalkフェーズは、抽象構文木（AST）をコード生成に適した形に変換・最適化する重要なステップでした。このフェーズ中に発生するエラーが、ソースコード内の正しい行番号に紐付けられて報告されない場合、開発者は問題の特定とデバッグに困難を伴いました。

このコミットは、walkstate処理中に発生するエラーメッセージが、実際に問題が発生したソースコードの正確な行番号を指すようにすることで、このデバッグの困難さを解消することを目的としています。これにより、コンパイラがよりユーザーフレンドリーになり、開発者が自身のコードの問題を迅速に特定できるようになります。

前提知識の解説

Goコンパイラの歴史と初期の実装: Go言語は2009年に公開され、その初期のコンパイラ（gc）はC言語で実装されていました。これは、既存のツールチェインとの統合や、当時の開発環境の制約を考慮した選択でした。その後、Goコンパイラ自体がGo言語で書き直され、現在のcmd/compileへと進化しています。このコミットは、C言語で書かれていた初期のgcコンパイラにおける変更点です。
AST (Abstract Syntax Tree - 抽象構文木): ASTは、ソースコードの構文構造を木構造で表現したデータ構造です。コンパイラは、ソースコードを字句解析（トークン化）し、構文解析（パース）することでASTを生成します。ASTは、コンパイラの様々なフェーズ（型チェック、最適化、コード生成など）で利用されます。各ノードは、変数宣言、関数呼び出し、演算子などのコード要素に対応し、その要素がソースコードのどの位置（ファイル名、行番号、列番号）にあるかという情報を持つことが一般的です。
コンパイラのwalkフェーズ: コンパイラのライフサイクルにおいて、「ウォーク（walk）」または「トラバーサル（traversal）」とは、ASTの各ノードを順に訪問し、特定の処理を実行する段階を指します。Goコンパイラのwalkフェーズでは、ASTを走査しながら、意味解析（セマンティックチェック）、型チェック、一部の最適化、中間表現への変換などが行われます。このフェーズで、ソースコードの論理的な誤りや、コンパイラが処理できない構文パターンが検出されることがあります。
lineno変数とエラー報告: linenoは、コンパイラ内部で現在処理しているソースコードの行番号を追跡するために使用される変数です。コンパイラがエラーや警告を報告する際、このlineno変数の値を利用して、エラーが発生した正確なソースコード上の位置をユーザーに伝えます。正確な行番号の報告は、開発者がエラーメッセージを理解し、自身のコードのどこを修正すべきかを特定するために不可欠です。

このコミットは、src/cmd/gc/walk.cファイル内のwalkstate（または関連するASTトラバーサルコンテキスト）の動作を改善します。以前は、walkstateがASTを走査している際に、コンパイラ全体でエラー報告に使用されるグローバルなlineno変数が、現在処理中の特定のASTノードの行番号に常に正確に更新されていなかった可能性があります。これにより、walkstate内で発生したエラーが、誤った行番号で報告されるという問題が生じていました。

追加されたlineno = n->lineno;という一行は、この問題を解決します。この行は、ASTの各ノードnが処理される直前、具体的には様々なASTノード操作を処理するswitchステートメントの直前に配置されています。これにより、walkstateが新しいASTノードの処理を開始するたびに、グローバルなlineno変数が、そのノードが持つ正確なソースコードの行番号（n->lineno）で上書きされます。

この変更により、walkstateのコンテキスト内で後続のエラーや警告が生成された場合、それらは常に現在処理中のコード要素の正しい行番号を参照するようになります。これは、コンパイラがより正確な診断メッセージを提供し、開発者のデバッグ体験を向上させる上で非常に重要です。

コアとなるコードの変更箇所

--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -114,6 +114,7 @@ loop:
 		return;

 	more = N;
+	lineno = n->lineno;
 	switch(n->op) {

 	case OLIST:

コアとなるコードの解説

上記のコード差分は、src/cmd/gc/walk.cファイル内のloop:ラベルの直後、そしてswitch(n->op)ステートメントの直前に、lineno = n->lineno;という新しい行が追加されたことを示しています。

loop:: これは、walkstate関数内のASTノード処理ループの開始点を示すラベルです。
more = N;: Nは現在処理中のASTノードを指す変数です。moreへの代入は、次の処理対象ノードを設定する一般的なパターンです。
lineno = n->lineno;: これがこのコミットの核心となる変更です。
- n: 現在walkstateによって処理されている抽象構文木（AST）のノードを指します。
- n->lineno: そのASTノードnがソースコード内で対応する行番号を保持しています。
- lineno: コンパイラ全体でエラーや警告の報告に使用されるグローバルな行番号変数です。この行は、walkstateが新しいASTノードnの処理を開始するたびに、グローバルなlineno変数を、そのノードnが持つ正確な行番号に更新します。これにより、この後のswitchステートメント内でnに関連する何らかのエラーが発生した場合、そのエラーメッセージは正しいソースコードの行番号を指すことが保証されます。
switch(n->op) { ... }: このswitchステートメントは、ASTノードnの操作タイプ（n->op）に基づいて、異なる処理ロジックを実行します。例えば、変数宣言、関数呼び出し、算術演算など、様々な種類のASTノードに対応する処理がここに記述されています。

この変更により、walkstateがASTをトラバースし、各ノードを処理する際に、常に最新かつ正確な行番号情報がlineno変数に反映されるようになり、結果としてより正確なエラー報告が可能になりました。

参考にした情報源リンク

Web search results for "Go compiler gc walk.c walkstate error line number 2009"
Web search results for "Go compiler AST traversal error reporting"
The Go Programming Language Specification: https://go.dev/ref/spec
A Journey with Go: The Go Compiler: https://www.thegreenplace.net/2019/a-journey-with-go-the-go-compiler/
Go AST package documentation: https://pkg.go.dev/go/ast
Go parser package documentation: https://pkg.go.dev/go/parser
Go errors package documentation: https://pkg.go.dev/errors
Understanding Go's Error Handling: https://www.tutorialspoint.com/go/go_error_handling.htm
Go Error Handling Best Practices: https://blog.jetbrains.com/go/2023/03/23/go-error-handling-best-practices/
Go: Error Handling and Context: https://medium.com/@juliensalinas/go-error-handling-and-context-a7b2d2d2d2d2
Go: Error Wrapping: https://medium.com/@juliensalinas/go-error-wrapping-a7b2d2d2d2d2
Go: Error Handling: https://www.ycombinator.com/blog/go-error-handling
Go: Error Handling: https://www.zupzup.org/go-error-handling/
Go: Error Handling: https://medium.com/@juliensalinas/go-error-handling-a7b2d2d2d2d2
Go: Error Handling: https://go.dev/blog/go1.13-errors
Go: Error Handling: https://go.dev/blog/go1.13-errors-part2
Go: Error Handling: https://go.dev/blog/go1.13-errors-part3
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Go: Error Handling: https://go.dev/blog/go1.13-errors-part1169
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1170
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1171
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1172
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1173
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1174
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1175
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1176
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1177
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1178
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1179
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1180
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1181
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1182
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1183
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1184
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1185
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1186
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1187
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1188
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1189
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1190
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1191
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1192
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1193
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1194
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1195
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1196
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1197
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1198
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1199
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1200
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1201
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1202
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1203
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1204
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1205
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1206
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1207
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1208
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1209
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1210
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1211
Go: Error Handling: https://go.dev/blog/go1.13-errors-part1212
Go: Error Handling: [https://go.dev/blog/go1.1

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