Auto merge of rust-lang#121370 - jieyouxu:migrate-compiletest-directi…

…ves, r=oli-obk

Migrate compiletest to use `ui_test`-style `//@` directives

## Preface

There's an on-going effort to rewrite parts of or the entirety of compiletest
(<rust-lang/compiler-team#536>). A step towards this involve migrating
compiletest tests to use the [`ui_test`](https://github.com/oli-obk/ui_test) framework, which
involves changing compiletest directives in `// <directive-name>` style to `ui_test`
`//@ <directive-name>` style (rust-lang/compiler-team#512).

This PR aims to implement the directive-style change from `//` to `//`@`` for the remaining
non-"ui" test suite tests.

## Key Changes

1. All `tests/` tests now use `//`@`` directives.
2. Compiletest only accepts `//`@`` and issues an error if an old-style directive is detected.
3. `// ignore-tidy` and `// ignore-tidy-*` are considered tidy directives and are ignored by
   compiletest header parsing.

## Diff Generation

The diff is generated by:

- Collecting directives from `tests/` via hijacking compiletest to emit successfully parsed
  directive lines.
- Using a migration tool
  (<https://github.com/jieyouxu/compiletest-ui_test-header-migration/tree/master>) to replace
  `//` directives in compiletest tests with `//`@`.`

### Reproduction Steps

0. Delete the temporary file `$RUSTC_REPO_PATH/build/<target_triple>/test/__directive_lines.txt`,
   if the collection script was previously ran.
1. Use the <https://github.com/jieyouxu/rust/tree/collect-test-directives> collect-test-directives
   script, which outputs a temporary file recording headers occuring in each compiletest test.
   - You need to checkout this branch: `git checkout collect-test-directives`.
   - This needs to be rebased on latest master to ensure up-to-date test directives can be collected.
   - You need to run `./x test` on each of the `test/*` subfolders once:

        ```bash
        ./x test tests/assembly/ --stage 1 --force-rerun
        ./x test tests/codegen/ --stage 1 --force-rerun
        ./x test tests/codegen-units/ --stage 1 --force-rerun
        ./x test tests/coverage/ --stage 1 --force-rerun
        ./x test tests/coverage-run-rustdoc/ --stage 1 --force-rerun
        ./x test tests/debuginfo/ --stage 1 --force-rerun
        ./x test tests/incremental/ --stage 1 --force-rerun
        ./x test tests/mir-opt/ --stage 1 --force-rerun
        ./x test tests/pretty/ --stage 1 --force-rerun
        ./x test tests/run-make/ --stage 1 --force-rerun
        ./x test tests/run-make-fulldeps/ --stage 1 --force-rerun
        ./x test tests/run-pass-valgrind/ --stage 1 --force-rerun
        ./x test tests/rustdoc/ --stage 1 --force-rerun
        TARGET=<target-triple> ./x test tests/rustdoc-gui/ --stage 1 --force-rerun
        ./x test tests/rustdoc-js/ --stage 1 --force-rerun
        ./x test tests/rustdoc-js-std/ --stage 1 --force-rerun
        ./x test tests/rustdoc-json/ --stage 1 --force-rerun
        ./x test tests/rustdoc-ui/ --stage 1 --force-rerun
        ./x test tests/ui/ --stage 1 --force-rerun
        ./x test tests/ui-fulldeps/ --stage 1 --force-rerun
        ```

2. Checkout the `migrate-compiletest-directives` branch.
3. Run the migration tool <https://github.com/jieyouxu/compiletest-ui_test-header-migration>.
4. Check that the migration at least does not cause test failures if you change compiletest to
   accept `//`@`` directives only. This is also required if the test outputs somehow need to be
   blessed.
   - `RUSTC_TEST_FAIL_FAST=1 ./x test tests/<secondary-directory>  --stage 1 --bless`
5. Confirm that there is no difference after running the migration tool when you are on the
   `migrate-compiletest-directives` branch.

## Follow Up Work

- [ ] Adjust rustc-dev-guide docs for compiletest directives (this time for all the other suites and modes). <rust-lang/rustc-dev-guide#1895>.

src/tools/compiletest/src/header.rs

@@ -673,14 +673,17 @@ pub fn line_directive<'line>(
 /// names. This is **not** an exhaustive list of all possible directives. Instead, this is a
 /// best-effort approximation for diagnostics.
 const DIAGNOSTICS_DIRECTIVE_NAMES: &[&str] = &[
+    "assembly-output",
     "aux-build",
     "aux-crate",
+    "build-aux-docs",
     "build-fail",
     "build-pass",
     "check-fail",
     "check-pass",
     "check-run-results",
     "check-stdout",
+    "check-test-line-numbers-match",
     "compile-flags",
     "dont-check-compiler-stderr",
     "dont-check-compiler-stdout",
@@ -691,12 +694,16 @@ const DIAGNOSTICS_DIRECTIVE_NAMES: &[&str] = &[
     "failure-status",
     "forbid-output",
     "force-host",
+    "ignore-16bit",
     "ignore-32bit",
     "ignore-64bit",
     "ignore-aarch64",
     "ignore-aarch64-unknown-linux-gnu",
     "ignore-android",
     "ignore-arm",
+    "ignore-avr",
+    "ignore-beta",
+    "ignore-cdb",
     "ignore-compare-mode-next-solver",
     "ignore-compare-mode-polonius",
     "ignore-cross-compile",
@@ -705,13 +712,21 @@ const DIAGNOSTICS_DIRECTIVE_NAMES: &[&str] = &[
     "ignore-endian-big",
     "ignore-freebsd",
     "ignore-fuchsia",
+    "ignore-gdb",
+    "ignore-gdb-version",
     "ignore-gnu",
     "ignore-haiku",
     "ignore-horizon",
     "ignore-i686-pc-windows-msvc",
     "ignore-ios",
+    "ignore-linux",
+    "ignore-lldb",
     "ignore-llvm-version",
+    "ignore-loongarch64",
     "ignore-macos",
+    "ignore-mode-coverage-map",
+    "ignore-mode-coverage-run",
+    "ignore-msp430",
     "ignore-msvc",
     "ignore-musl",
     "ignore-netbsd",
@@ -720,8 +735,13 @@ const DIAGNOSTICS_DIRECTIVE_NAMES: &[&str] = &[
     "ignore-nvptx64",
     "ignore-openbsd",
     "ignore-pass",
+    "ignore-remote",
+    "ignore-riscv64",
+    "ignore-s390x",
     "ignore-sgx",
     "ignore-spirv",
+    "ignore-stable",
+    "ignore-stage1",
     "ignore-test",
     "ignore-thumbv8m.base-none-eabi",
     "ignore-thumbv8m.main-none-eabi",
@@ -731,9 +751,15 @@ const DIAGNOSTICS_DIRECTIVE_NAMES: &[&str] = &[
     "ignore-wasm32",
     "ignore-wasm32-bare",
     "ignore-windows",
+    "ignore-windows-gnu",
     "ignore-x86",
+    "ignore-x86_64-apple-darwin",
     "incremental",
     "known-bug",
+    "llvm-cov-flags",
+    "min-cdb-version",
+    "min-gdb-version",
+    "min-lldb-version",
     "min-llvm-version",
     "needs-asm-support",
     "needs-dlltool",
@@ -742,11 +768,15 @@ const DIAGNOSTICS_DIRECTIVE_NAMES: &[&str] = &[
     "needs-profiler-support",
     "needs-relocation-model-pic",
     "needs-run-enabled",
+    "needs-rust-lldb",
     "needs-sanitizer-address",
     "needs-sanitizer-cfi",
     "needs-sanitizer-hwaddress",
     "needs-sanitizer-leak",
     "needs-sanitizer-memory",
+    "needs-sanitizer-memtag",
+    "needs-sanitizer-safestack",
+    "needs-sanitizer-shadow-call-stack",
     "needs-sanitizer-support",
     "needs-sanitizer-thread",
     "needs-unwind",
@@ -756,23 +786,42 @@ const DIAGNOSTICS_DIRECTIVE_NAMES: &[&str] = &[
     "normalize-stderr-64bit",
     "normalize-stderr-test",
     "normalize-stdout-test",
+    "only-16bit",
     "only-32bit",
     "only-64bit",
     "only-aarch64",
+    "only-arm",
+    "only-avr",
+    "only-bpf",
+    "only-cdb",
     "only-gnu",
     "only-i686-pc-windows-msvc",
     "only-linux",
+    "only-loongarch64",
+    "only-loongarch64-unknown-linux-gnu",
     "only-macos",
+    "only-mips",
+    "only-mips64",
+    "only-msp430",
     "only-msvc",
     "only-nightly",
+    "only-nvptx64",
+    "only-riscv64",
+    "only-sparc",
+    "only-sparc64",
+    "only-thumb",
     "only-wasm32",
+    "only-wasm32-bare",
     "only-windows",
     "only-x86",
     "only-x86_64",
+    "only-x86_64-fortanix-unknown-sgx",
     "only-x86_64-pc-windows-msvc",
     "only-x86_64-unknown-linux-gnu",
     "pp-exact",
+    "pretty-compare-only",
     "pretty-expanded",
+    "pretty-mode",
     "regex-error-pattern",
     "remap-src-base",
     "revisions",
@@ -783,7 +832,10 @@ const DIAGNOSTICS_DIRECTIVE_NAMES: &[&str] = &[
     "rustc-env",
     "rustfix-only-machine-applicable",
     "should-fail",
+    "should-ice",
     "stderr-per-bitwidth",
+    "unit-test",
+    "unset-exec-env",
     "unset-rustc-env",
 ];
 
@@ -817,7 +869,7 @@ struct HeaderLine<'ln> {
 
 fn iter_header(
     mode: Mode,
-    suite: &str,
+    _suite: &str,
     poisoned: &mut bool,
     testfile: &Path,
     rdr: impl Read,
@@ -848,11 +900,7 @@ fn iter_header(
         }
     }
 
-    let comment = if testfile.extension().is_some_and(|e| e == "rs") {
-        if mode == Mode::Ui && suite == "ui" { "//@" } else { "//" }
-    } else {
-        "#"
-    };
+    let comment = if testfile.extension().is_some_and(|e| e == "rs") { "//@" } else { "#" };
 
     let mut rdr = BufReader::with_capacity(1024, rdr);
     let mut ln = String::new();
@@ -879,7 +927,7 @@ fn iter_header(
         // First try to accept `ui_test` style comments
         } else if let Some((header_revision, directive)) = line_directive(comment, ln) {
             it(HeaderLine { line_number, original_line, header_revision, directive });
-        } else if mode == Mode::Ui && suite == "ui" && !REVISION_MAGIC_COMMENT_RE.is_match(ln) {
+        } else if !REVISION_MAGIC_COMMENT_RE.is_match(ln) {
             let Some((_, rest)) = line_directive("//", ln) else {
                 continue;
             };
@@ -899,7 +947,7 @@ fn iter_header(
                         // directive. We emit an error here to warn the user.
                         *poisoned = true;
                         eprintln!(
-                            "error: detected legacy-style directives in ui test: {}:{}, please use `ui_test`-style directives `//@` instead:{:#?}",
+                            "error: detected legacy-style directives in compiletest test: {}:{}, please use `ui_test`-style directives `//@` instead:{:#?}",
                             testfile.display(),
                             line_number,
                             line_directive("//", ln),
@@ -912,7 +960,7 @@ fn iter_header(
                         // directive. We emit an error here to warn the user.
                         *poisoned = true;
                         eprintln!(
-                            "error: detected legacy-style directives in ui test: {}:{}, please use `ui_test`-style directives `//@` instead:{:#?}",
+                            "error: detected legacy-style directives in compiletest test: {}:{}, please use `ui_test`-style directives `//@` instead:{:#?}",
                             testfile.display(),
                             line_number,
                             line_directive("//", ln),
@@ -1213,11 +1261,8 @@ pub fn make_test_description<R: Read>(
 
             if let Some((_, post)) = original_line.trim_start().split_once("//") {
                 let post = post.trim_start();
-                if post.starts_with("ignore-tidy")
-                    && config.mode == Mode::Ui
-                    && config.suite == "ui"
-                {
-                    // not handled by compiletest under the ui test mode and ui test suite.
+                if post.starts_with("ignore-tidy") {
+                    // Not handled by compiletest.
                 } else {
                     decision!(cfg::handle_ignore(config, ln));
                 }

src/tools/compiletest/src/header/tests.rs

@@ -578,12 +578,7 @@ fn ignore_mode() {
         assert_eq!(config.mode, Mode::from_str(mode).unwrap());
         assert_ne!(config.mode, Mode::from_str(other).unwrap());
 
-        if mode == "ui" {
-            assert!(check_ignore(&config, &format!("//@ ignore-mode-{mode}")));
-            assert!(!check_ignore(&config, &format!("//@ ignore-mode-{other}")));
-        } else {
-            assert!(check_ignore(&config, &format!("// ignore-mode-{mode}")));
-            assert!(!check_ignore(&config, &format!("// ignore-mode-{other}")));
-        }
+        assert!(check_ignore(&config, &format!("//@ ignore-mode-{mode}")));
+        assert!(!check_ignore(&config, &format!("//@ ignore-mode-{other}")));
     }
 }

src/tools/compiletest/src/runtest.rs

@@ -3938,15 +3938,10 @@ impl<'test> TestCx<'test> {
                 self.props.compare_output_lines_by_subset,
             );
         } else if !expected_fixed.is_empty() {
-            if self.config.suite == "ui" {
-                panic!(
-                    "the `//@ run-rustfix` directive wasn't found but a `*.fixed` file was found"
-                );
-            } else {
-                panic!(
-                    "the `// run-rustfix` directive wasn't found but a `*.fixed` file was found"
-                );
-            }
+            panic!(
+                "the `//@ run-rustfix` directive wasn't found but a `*.fixed` \
+                 file was found"
+            );
         }
 
         if errors > 0 {

src/tools/tidy/src/target_policy.rs

@@ -7,7 +7,7 @@ use std::{collections::HashSet, path::Path};
 
 const TARGET_DEFINITIONS_PATH: &str = "compiler/rustc_target/src/spec/targets/";
 const ASSEMBLY_TEST_PATH: &str = "tests/assembly/targets/";
-const REVISION_LINE_START: &str = "// revisions: ";
+const REVISION_LINE_START: &str = "//@ revisions: ";
 const EXCEPTIONS: &[&str] = &[
     // FIXME: disabled since it fails on CI saying the csky component is missing
     "csky_unknown_linux_gnuabiv2",

src/tools/tidy/src/target_specific_tests.rs

@@ -6,7 +6,7 @@ use std::path::Path;
 
 use crate::walk::filter_not_rust;
 
-const COMMENT: &str = "//";
+const COMMENT: &str = "//@";
 const LLVM_COMPONENTS_HEADER: &str = "needs-llvm-components:";
 const COMPILE_FLAGS_HEADER: &str = "compile-flags:";
 

tests/assembly/aarch64-naked-fn-no-bti-prolog.rs

@@ -1,7 +1,7 @@
-// compile-flags: -C no-prepopulate-passes -Zbranch-protection=bti
-// assembly-output: emit-asm
-// needs-asm-support
-// only-aarch64
+//@ compile-flags: -C no-prepopulate-passes -Zbranch-protection=bti
+//@ assembly-output: emit-asm
+//@ needs-asm-support
+//@ only-aarch64
 
 #![crate_type = "lib"]
 #![feature(naked_functions)]

tests/assembly/aarch64-pointer-auth.rs

@@ -1,9 +1,9 @@
 // Test that PAC instructions are emitted when branch-protection is specified.
 
-// assembly-output: emit-asm
-// compile-flags: --target aarch64-unknown-linux-gnu
-// compile-flags: -Z branch-protection=pac-ret,leaf
-// needs-llvm-components: aarch64
+//@ assembly-output: emit-asm
+//@ compile-flags: --target aarch64-unknown-linux-gnu
+//@ compile-flags: -Z branch-protection=pac-ret,leaf
+//@ needs-llvm-components: aarch64
 
 #![feature(no_core, lang_items)]
 #![no_std]

tests/assembly/align_offset.rs

@@ -1,6 +1,6 @@
-// assembly-output: emit-asm
-// compile-flags: -Copt-level=1
-// only-x86_64
+//@ assembly-output: emit-asm
+//@ compile-flags: -Copt-level=1
+//@ only-x86_64
 #![crate_type="rlib"]
 
 // CHECK-LABEL: align_offset_byte_ptr

tests/assembly/asm/aarch64-el2vmsa.rs

@@ -1,6 +1,6 @@
-// assembly-output: emit-asm
-// compile-flags: --target aarch64-unknown-linux-gnu
-// needs-llvm-components: aarch64
+//@ assembly-output: emit-asm
+//@ compile-flags: --target aarch64-unknown-linux-gnu
+//@ needs-llvm-components: aarch64
 
 #![feature(no_core, lang_items, rustc_attrs)]
 #![crate_type = "rlib"]

tests/assembly/asm/aarch64-modifiers.rs

@@ -1,7 +1,7 @@
-// assembly-output: emit-asm
-// compile-flags: -O
-// compile-flags: --target aarch64-unknown-linux-gnu
-// needs-llvm-components: aarch64
+//@ assembly-output: emit-asm
+//@ compile-flags: -O
+//@ compile-flags: --target aarch64-unknown-linux-gnu
+//@ needs-llvm-components: aarch64
 
 #![feature(no_core, lang_items, rustc_attrs)]
 #![crate_type = "rlib"]

tests/assembly/asm/aarch64-outline-atomics.rs

@@ -1,9 +1,9 @@
-// assembly-output: emit-asm
-// compile-flags: -O
-// compile-flags: --target aarch64-unknown-linux-gnu
-// needs-llvm-components: aarch64
-// only-aarch64
-// only-linux
+//@ assembly-output: emit-asm
+//@ compile-flags: -O
+//@ compile-flags: --target aarch64-unknown-linux-gnu
+//@ needs-llvm-components: aarch64
+//@ only-aarch64
+//@ only-linux
 
 #![crate_type = "rlib"]
 

tests/assembly/asm/aarch64-types.rs

@@ -1,6 +1,6 @@
-// assembly-output: emit-asm
-// compile-flags: --target aarch64-unknown-linux-gnu
-// needs-llvm-components: aarch64
+//@ assembly-output: emit-asm
+//@ compile-flags: --target aarch64-unknown-linux-gnu
+//@ needs-llvm-components: aarch64
 
 #![feature(no_core, lang_items, rustc_attrs, repr_simd)]
 #![crate_type = "rlib"]

tests/assembly/asm/arm-modifiers.rs

@@ -1,8 +1,8 @@
-// assembly-output: emit-asm
-// compile-flags: -O
-// compile-flags: --target armv7-unknown-linux-gnueabihf
-// compile-flags: -C target-feature=+neon
-// needs-llvm-components: arm
+//@ assembly-output: emit-asm
+//@ compile-flags: -O
+//@ compile-flags: --target armv7-unknown-linux-gnueabihf
+//@ compile-flags: -C target-feature=+neon
+//@ needs-llvm-components: arm
 
 #![feature(no_core, lang_items, rustc_attrs, repr_simd)]
 #![crate_type = "rlib"]

tests/assembly/asm/arm-types.rs

@@ -1,8 +1,8 @@
-// assembly-output: emit-asm
-// compile-flags: --target armv7-unknown-linux-gnueabihf
-// compile-flags: -C target-feature=+neon
-// compile-flags: -C opt-level=0
-// needs-llvm-components: arm
+//@ assembly-output: emit-asm
+//@ compile-flags: --target armv7-unknown-linux-gnueabihf
+//@ compile-flags: -C target-feature=+neon
+//@ compile-flags: -C opt-level=0
+//@ needs-llvm-components: arm
 
 #![feature(no_core, lang_items, rustc_attrs, repr_simd)]
 #![crate_type = "rlib"]

tests/assembly/asm/avr-modifiers.rs

@@ -1,6 +1,6 @@
-// assembly-output: emit-asm
-// compile-flags: --target avr-unknown-gnu-atmega328
-// needs-llvm-components: avr
+//@ assembly-output: emit-asm
+//@ compile-flags: --target avr-unknown-gnu-atmega328
+//@ needs-llvm-components: avr
 
 #![feature(no_core, lang_items, rustc_attrs, asm_experimental_arch)]
 #![crate_type = "rlib"]