Rollup merge of #133733 - jyn514:compiletest-diffs, r=jieyouxu

 compiletest: show the difference between the normalized output and the actual output for lines which didn't match

example output:
```
failures:

---- [ui] tests/ui/layout/enum.rs stdout ----
diff of stderr:

-	error: align: AbiAndPrefAlign { abi: Align(2 bytes), pref: $PREF_ALIGN }
+	error: align: AbiAndPrefAlign { abi: Align(2 bytes), pref: $PREF_ALIN }
2	  --> $DIR/enum.rs:9:1
3	   |
4	LL | enum UninhabitedVariantAlign {

Note: some mismatched output was normalized before being compared
-	error: align: AbiAndPrefAlign { abi: Align(2 bytes), pref: Align(8 bytes) }
-	  --> /home/jyn/src/rust2/tests/ui/layout/enum.rs:9:1
+	error: align: AbiAndPrefAlign { abi: Align(2 bytes), pref: $PREF_ALIN }
```

Author: matthiaskrgr

Diff for: src/tools/compiletest/src/runtest.rs

@@ -22,7 +22,7 @@ use crate::common::{
     UI_STDERR, UI_STDOUT, UI_SVG, UI_WINDOWS_SVG, Ui, expected_output_path, incremental_dir,
     output_base_dir, output_base_name, output_testname_unique,
 };
-use crate::compute_diff::{write_diff, write_filtered_diff};
+use crate::compute_diff::{DiffLine, make_diff, write_diff, write_filtered_diff};
 use crate::errors::{self, Error, ErrorKind};
 use crate::header::TestProps;
 use crate::read2::{Truncated, read2_abbreviated};
@@ -2295,17 +2295,31 @@ impl<'test> TestCx<'test> {
         match output_kind {
             TestOutput::Compile => {
                 if !self.props.dont_check_compiler_stdout {
-                    errors +=
-                        self.compare_output(stdout_kind, &normalized_stdout, &expected_stdout);
+                    errors += self.compare_output(
+                        stdout_kind,
+                        &normalized_stdout,
+                        &proc_res.stdout,
+                        &expected_stdout,
+                    );
                 }
                 if !self.props.dont_check_compiler_stderr {
-                    errors +=
-                        self.compare_output(stderr_kind, &normalized_stderr, &expected_stderr);
+                    errors += self.compare_output(
+                        stderr_kind,
+                        &normalized_stderr,
+                        &stderr,
+                        &expected_stderr,
+                    );
                 }
             }
             TestOutput::Run => {
-                errors += self.compare_output(stdout_kind, &normalized_stdout, &expected_stdout);
-                errors += self.compare_output(stderr_kind, &normalized_stderr, &expected_stderr);
+                errors += self.compare_output(
+                    stdout_kind,
+                    &normalized_stdout,
+                    &proc_res.stdout,
+                    &expected_stdout,
+                );
+                errors +=
+                    self.compare_output(stderr_kind, &normalized_stderr, &stderr, &expected_stderr);
             }
         }
         errors
@@ -2533,7 +2547,13 @@ impl<'test> TestCx<'test> {
         }
     }
 
-    fn compare_output(&self, stream: &str, actual: &str, expected: &str) -> usize {
+    fn compare_output(
+        &self,
+        stream: &str,
+        actual: &str,
+        actual_unnormalized: &str,
+        expected: &str,
+    ) -> usize {
         let are_different = match (self.force_color_svg(), expected.find('\n'), actual.find('\n')) {
             // FIXME: We ignore the first line of SVG files
             // because the width parameter is non-deterministic.
@@ -2590,28 +2610,14 @@ impl<'test> TestCx<'test> {
             if expected.is_empty() {
                 println!("normalized {}:\n{}\n", stream, actual);
             } else {
-                println!("diff of {stream}:\n");
-                if let Some(diff_command) = self.config.diff_command.as_deref() {
-                    let mut args = diff_command.split_whitespace();
-                    let name = args.next().unwrap();
-                    match Command::new(name)
-                        .args(args)
-                        .args([&expected_path, &actual_path])
-                        .output()
-                    {
-                        Err(err) => {
-                            self.fatal(&format!(
-                                "failed to call custom diff command `{diff_command}`: {err}"
-                            ));
-                        }
-                        Ok(output) => {
-                            let output = String::from_utf8_lossy(&output.stdout);
-                            print!("{output}");
-                        }
-                    }
-                } else {
-                    print!("{}", write_diff(expected, actual, 3));
-                }
+                self.show_diff(
+                    stream,
+                    &expected_path,
+                    &actual_path,
+                    expected,
+                    actual,
+                    actual_unnormalized,
+                );
             }
         } else {
             // Delete non-revision .stderr/.stdout file if revisions are used.
@@ -2633,6 +2639,76 @@ impl<'test> TestCx<'test> {
         if self.config.bless { 0 } else { 1 }
     }
 
+    /// Returns whether to show the full stderr/stdout.
+    fn show_diff(
+        &self,
+        stream: &str,
+        expected_path: &Path,
+        actual_path: &Path,
+        expected: &str,
+        actual: &str,
+        actual_unnormalized: &str,
+    ) {
+        eprintln!("diff of {stream}:\n");
+        if let Some(diff_command) = self.config.diff_command.as_deref() {
+            let mut args = diff_command.split_whitespace();
+            let name = args.next().unwrap();
+            match Command::new(name).args(args).args([expected_path, actual_path]).output() {
+                Err(err) => {
+                    self.fatal(&format!(
+                        "failed to call custom diff command `{diff_command}`: {err}"
+                    ));
+                }
+                Ok(output) => {
+                    let output = String::from_utf8_lossy(&output.stdout);
+                    eprint!("{output}");
+                }
+            }
+        } else {
+            eprint!("{}", write_diff(expected, actual, 3));
+        }
+
+        // NOTE: argument order is important, we need `actual` to be on the left so the line number match up when we compare it to `actual_unnormalized` below.
+        let diff_results = make_diff(actual, expected, 0);
+
+        let (mut mismatches_normalized, mut mismatch_line_nos) = (String::new(), vec![]);
+        for hunk in diff_results {
+            let mut line_no = hunk.line_number;
+            for line in hunk.lines {
+                // NOTE: `Expected` is actually correct here, the argument order is reversed so our line numbers match up
+                if let DiffLine::Expected(normalized) = line {
+                    mismatches_normalized += &normalized;
+                    mismatches_normalized += "\n";
+                    mismatch_line_nos.push(line_no);
+                    line_no += 1;
+                }
+            }
+        }
+        let mut mismatches_unnormalized = String::new();
+        let diff_normalized = make_diff(actual, actual_unnormalized, 0);
+        for hunk in diff_normalized {
+            if mismatch_line_nos.contains(&hunk.line_number) {
+                for line in hunk.lines {
+                    if let DiffLine::Resulting(unnormalized) = line {
+                        mismatches_unnormalized += &unnormalized;
+                        mismatches_unnormalized += "\n";
+                    }
+                }
+            }
+        }
+
+        let normalized_diff = make_diff(&mismatches_normalized, &mismatches_unnormalized, 0);
+        // HACK: instead of checking if each hunk is empty, this only checks if the whole input is empty. we should be smarter about this so we don't treat added or removed output as normalized.
+        if !normalized_diff.is_empty()
+            && !mismatches_unnormalized.is_empty()
+            && !mismatches_normalized.is_empty()
+        {
+            eprintln!("Note: some mismatched output was normalized before being compared");
+            // FIXME: respect diff_command
+            eprint!("{}", write_diff(&mismatches_unnormalized, &mismatches_normalized, 0));
+        }
+    }
+
     fn check_and_prune_duplicate_outputs(
         &self,
         proc_res: &ProcRes,

Diff for: src/tools/compiletest/src/runtest/coverage.rs

@@ -39,8 +39,12 @@ impl<'test> TestCx<'test> {
         let expected_coverage_dump = self.load_expected_output(kind);
         let actual_coverage_dump = self.normalize_output(&proc_res.stdout, &[]);
 
-        let coverage_dump_errors =
-            self.compare_output(kind, &actual_coverage_dump, &expected_coverage_dump);
+        let coverage_dump_errors = self.compare_output(
+            kind,
+            &actual_coverage_dump,
+            &proc_res.stdout,
+            &expected_coverage_dump,
+        );
 
         if coverage_dump_errors > 0 {
             self.fatal_proc_rec(
@@ -135,8 +139,12 @@ impl<'test> TestCx<'test> {
                 self.fatal_proc_rec(&err, &proc_res);
             });
 
-        let coverage_errors =
-            self.compare_output(kind, &normalized_actual_coverage, &expected_coverage);
+        let coverage_errors = self.compare_output(
+            kind,
+            &normalized_actual_coverage,
+            &proc_res.stdout,
+            &expected_coverage,
+        );
 
         if coverage_errors > 0 {
             self.fatal_proc_rec(

Diff for: src/tools/compiletest/src/runtest/ui.rs

@@ -100,7 +100,7 @@ impl TestCx<'_> {
                 )
             });
 
-            errors += self.compare_output("fixed", &fixed_code, &expected_fixed);
+            errors += self.compare_output("fixed", &fixed_code, &fixed_code, &expected_fixed);
         } else if !expected_fixed.is_empty() {
             panic!(
                 "the `//@ run-rustfix` directive wasn't found but a `*.fixed` \