Rollup merge of #132033 - Zalathar:directive-line, r=jieyouxu

compiletest: Make `line_directive` return a `DirectiveLine`

This reduces the need to juggle raw tuples, and opens up the possibility of moving more parts of directive parsing into `line_directive`.

In order to make the main change possible, this PR also (partly) separates the debugger-command parsing from the main directive parser. That cleanup removes support for `[rev]` in debugger commands, which is not used by any tests.

3 files changed, 56 insertions, 65 deletions

diff --git a/src/tools/compiletest/src/header.rs b/src/tools/compiletest/src/header.rs
index 099e620ffe0..d75cdefe635 100644
--- a/src/tools/compiletest/src/header.rs
+++ b/src/tools/compiletest/src/header.rs
@@ -57,7 +57,7 @@ impl EarlyProps {
             &mut poisoned,
             testfile,
             rdr,
-            &mut |DirectiveLine { directive: ln, .. }| {
+            &mut |DirectiveLine { raw_directive: ln, .. }| {
                 parse_and_update_aux(config, ln, &mut props.aux);
                 config.parse_and_update_revisions(testfile, ln, &mut props.revisions);
             },
@@ -344,8 +344,8 @@ impl TestProps {
                 &mut poisoned,
                 testfile,
                 file,
-                &mut |DirectiveLine { header_revision, directive: ln, .. }| {
-                    if header_revision.is_some() && header_revision != test_revision {
+                &mut |directive @ DirectiveLine { raw_directive: ln, .. }| {
+                    if !directive.applies_to_test_revision(test_revision) {
                         return;
                     }
 
@@ -678,28 +678,35 @@ impl TestProps {
     }
 }
 
-/// Extract an `(Option<line_revision>, directive)` directive from a line if comment is present.
-///
-/// See [`DirectiveLine`] for a diagram.
-pub fn line_directive<'line>(
+/// If the given line begins with the appropriate comment prefix for a directive,
+/// returns a struct containing various parts of the directive.
+fn line_directive<'line>(
+    line_number: usize,
     comment: &str,
     original_line: &'line str,
-) -> Option<(Option<&'line str>, &'line str)> {
+) -> Option<DirectiveLine<'line>> {
     // Ignore lines that don't start with the comment prefix.
     let after_comment = original_line.trim_start().strip_prefix(comment)?.trim_start();
 
+    let revision;
+    let raw_directive;
+
     if let Some(after_open_bracket) = after_comment.strip_prefix('[') {
         // A comment like `//@[foo]` only applies to revision `foo`.
-        let Some((line_revision, directive)) = after_open_bracket.split_once(']') else {
+        let Some((line_revision, after_close_bracket)) = after_open_bracket.split_once(']') else {
             panic!(
                 "malformed condition directive: expected `{comment}[foo]`, found `{original_line}`"
             )
         };
 
-        Some((Some(line_revision), directive.trim_start()))
+        revision = Some(line_revision);
+        raw_directive = after_close_bracket.trim_start();
     } else {
-        Some((None, after_comment))
-    }
+        revision = None;
+        raw_directive = after_comment;
+    };
+
+    Some(DirectiveLine { line_number, revision, raw_directive })
 }
 
 // To prevent duplicating the list of commmands between `compiletest`,`htmldocck` and `jsondocck`,
@@ -730,28 +737,37 @@ const KNOWN_HTMLDOCCK_DIRECTIVE_NAMES: &[&str] = &[
 const KNOWN_JSONDOCCK_DIRECTIVE_NAMES: &[&str] =
     &["count", "!count", "has", "!has", "is", "!is", "ismany", "!ismany", "set", "!set"];
 
-/// The broken-down contents of a line containing a test header directive,
+/// The (partly) broken-down contents of a line containing a test directive,
 /// which [`iter_header`] passes to its callback function.
 ///
 /// For example:
 ///
 /// ```text
 /// //@ compile-flags: -O
-///     ^^^^^^^^^^^^^^^^^ directive
+///     ^^^^^^^^^^^^^^^^^ raw_directive
 ///
 /// //@ [foo] compile-flags: -O
-///      ^^^                    header_revision
-///           ^^^^^^^^^^^^^^^^^ directive
+///      ^^^                    revision
+///           ^^^^^^^^^^^^^^^^^ raw_directive
 /// ```
 struct DirectiveLine<'ln> {
     line_number: usize,
-    /// Some header directives start with a revision name in square brackets
+    /// Some test directives start with a revision name in square brackets
     /// (e.g. `[foo]`), and only apply to that revision of the test.
     /// If present, this field contains the revision name (e.g. `foo`).
-    header_revision: Option<&'ln str>,
-    /// The main part of the header directive, after removing the comment prefix
+    revision: Option<&'ln str>,
+    /// The main part of the directive, after removing the comment prefix
     /// and the optional revision specifier.
-    directive: &'ln str,
+    ///
+    /// This is "raw" because the directive's name and colon-separated value
+    /// (if present) have not yet been extracted or checked.
+    raw_directive: &'ln str,
+}
+
+impl<'ln> DirectiveLine<'ln> {
+    fn applies_to_test_revision(&self, test_revision: Option<&str>) -> bool {
+        self.revision.is_none() || self.revision == test_revision
+    }
 }
 
 pub(crate) struct CheckDirectiveResult<'ln> {
@@ -819,8 +835,8 @@ fn iter_header(
             "ignore-cross-compile",
         ];
         // Process the extra implied directives, with a dummy line number of 0.
-        for directive in extra_directives {
-            it(DirectiveLine { line_number: 0, header_revision: None, directive });
+        for raw_directive in extra_directives {
+            it(DirectiveLine { line_number: 0, revision: None, raw_directive });
         }
     }
 
@@ -847,24 +863,21 @@ fn iter_header(
             return;
         }
 
-        let Some((header_revision, non_revisioned_directive_line)) = line_directive(comment, ln)
-        else {
+        let Some(directive_line) = line_directive(line_number, comment, ln) else {
             continue;
         };
 
         // Perform unknown directive check on Rust files.
         if testfile.extension().map(|e| e == "rs").unwrap_or(false) {
-            let directive_ln = non_revisioned_directive_line.trim();
-
             let CheckDirectiveResult { is_known_directive, trailing_directive } =
-                check_directive(directive_ln, mode, ln);
+                check_directive(directive_line.raw_directive, mode, ln);
 
             if !is_known_directive {
                 *poisoned = true;
 
                 eprintln!(
                     "error: detected unknown compiletest test directive `{}` in {}:{}",
-                    directive_ln,
+                    directive_line.raw_directive,
                     testfile.display(),
                     line_number,
                 );
@@ -888,11 +901,7 @@ fn iter_header(
             }
         }
 
-        it(DirectiveLine {
-            line_number,
-            header_revision,
-            directive: non_revisioned_directive_line,
-        });
+        it(directive_line);
     }
 }
 
@@ -1292,8 +1301,8 @@ pub fn make_test_description<R: Read>(
         &mut local_poisoned,
         path,
         src,
-        &mut |DirectiveLine { header_revision, directive: ln, line_number }| {
-            if header_revision.is_some() && header_revision != test_revision {
+        &mut |directive @ DirectiveLine { line_number, raw_directive: ln, .. }| {
+            if !directive.applies_to_test_revision(test_revision) {
                 return;
             }
 
diff --git a/src/tools/compiletest/src/runtest/debugger.rs b/src/tools/compiletest/src/runtest/debugger.rs
index 985fe6381e8..c15422fb6f6 100644
--- a/src/tools/compiletest/src/runtest/debugger.rs
+++ b/src/tools/compiletest/src/runtest/debugger.rs
@@ -4,7 +4,6 @@ use std::io::{BufRead, BufReader};
 use std::path::{Path, PathBuf};
 
 use crate::common::Config;
-use crate::header::line_directive;
 use crate::runtest::ProcRes;
 
 /// Representation of information to invoke a debugger and check its output
@@ -24,7 +23,6 @@ impl DebuggerCommands {
         file: &Path,
         config: &Config,
         debugger_prefixes: &[&str],
-        rev: Option<&str>,
     ) -> Result<Self, String> {
         let directives = debugger_prefixes
             .iter()
@@ -39,18 +37,17 @@ impl DebuggerCommands {
         for (line_no, line) in reader.lines().enumerate() {
             counter += 1;
             let line = line.map_err(|e| format!("Error while parsing debugger commands: {}", e))?;
-            let (lnrev, line) = line_directive("//", &line).unwrap_or((None, &line));
-
-            // Skip any revision specific directive that doesn't match the current
-            // revision being tested
-            if lnrev.is_some() && lnrev != rev {
-                continue;
-            }
 
+            // Breakpoints appear on lines with actual code, typically at the end of the line.
             if line.contains("#break") {
                 breakpoint_lines.push(counter);
+                continue;
             }
 
+            let Some(line) = line.trim_start().strip_prefix("//").map(str::trim_start) else {
+                continue;
+            };
+
             for &(ref command_directive, ref check_directive) in &directives {
                 config
                     .parse_name_value_directive(&line, command_directive)
diff --git a/src/tools/compiletest/src/runtest/debuginfo.rs b/src/tools/compiletest/src/runtest/debuginfo.rs
index bd0845b4524..c621c22ac99 100644
--- a/src/tools/compiletest/src/runtest/debuginfo.rs
+++ b/src/tools/compiletest/src/runtest/debuginfo.rs
@@ -66,13 +66,8 @@ impl TestCx<'_> {
         };
 
         // Parse debugger commands etc from test files
-        let dbg_cmds = DebuggerCommands::parse_from(
-            &self.testpaths.file,
-            self.config,
-            prefixes,
-            self.revision,
-        )
-        .unwrap_or_else(|e| self.fatal(&e));
+        let dbg_cmds = DebuggerCommands::parse_from(&self.testpaths.file, self.config, prefixes)
+            .unwrap_or_else(|e| self.fatal(&e));
 
         // https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/debugger-commands
         let mut script_str = String::with_capacity(2048);
@@ -142,13 +137,8 @@ impl TestCx<'_> {
     }
 
     fn run_debuginfo_gdb_test_no_opt(&self) {
-        let dbg_cmds = DebuggerCommands::parse_from(
-            &self.testpaths.file,
-            self.config,
-            &["gdb"],
-            self.revision,
-        )
-        .unwrap_or_else(|e| self.fatal(&e));
+        let dbg_cmds = DebuggerCommands::parse_from(&self.testpaths.file, self.config, &["gdb"])
+            .unwrap_or_else(|e| self.fatal(&e));
         let mut cmds = dbg_cmds.commands.join("\n");
 
         // compile test file (it should have 'compile-flags:-g' in the header)
@@ -413,13 +403,8 @@ impl TestCx<'_> {
         }
 
         // Parse debugger commands etc from test files
-        let dbg_cmds = DebuggerCommands::parse_from(
-            &self.testpaths.file,
-            self.config,
-            &["lldb"],
-            self.revision,
-        )
-        .unwrap_or_else(|e| self.fatal(&e));
+        let dbg_cmds = DebuggerCommands::parse_from(&self.testpaths.file, self.config, &["lldb"])
+            .unwrap_or_else(|e| self.fatal(&e));
 
         // Write debugger script:
         // We don't want to hang when calling `quit` while the process is still running