summaryrefslogtreecommitdiffstats
path: root/src/librustdoc/lib.rs
blob: dda06d4c9c1d7ffd28de585c20d061be27ed172d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
#![doc(
    html_root_url = "https://doc.rust-lang.org/nightly/",
    html_playground_url = "https://play.rust-lang.org/"
)]
#![feature(rustc_private)]
#![feature(array_methods)]
#![feature(assert_matches)]
#![feature(box_patterns)]
#![feature(if_let_guard)]
#![feature(impl_trait_in_assoc_type)]
#![feature(iter_intersperse)]
#![feature(lazy_cell)]
#![feature(let_chains)]
#![feature(never_type)]
#![feature(round_char_boundary)]
#![feature(test)]
#![feature(type_alias_impl_trait)]
#![feature(type_ascription)]
#![recursion_limit = "256"]
#![warn(rustc::internal)]
#![allow(clippy::collapsible_if, clippy::collapsible_else_if)]
#![allow(rustc::potential_query_instability)]

extern crate thin_vec;
#[macro_use]
extern crate tracing;

// N.B. these need `extern crate` even in 2018 edition
// because they're loaded implicitly from the sysroot.
// The reason they're loaded from the sysroot is because
// the rustdoc artifacts aren't stored in rustc's cargo target directory.
// So if `rustc` was specified in Cargo.toml, this would spuriously rebuild crates.
//
// Dependencies listed in Cargo.toml do not need `extern crate`.

extern crate pulldown_cmark;
extern crate rustc_abi;
extern crate rustc_ast;
extern crate rustc_ast_pretty;
extern crate rustc_attr;
extern crate rustc_const_eval;
extern crate rustc_data_structures;
extern crate rustc_driver;
extern crate rustc_errors;
extern crate rustc_expand;
extern crate rustc_feature;
extern crate rustc_hir;
extern crate rustc_hir_analysis;
extern crate rustc_hir_pretty;
extern crate rustc_index;
extern crate rustc_infer;
extern crate rustc_interface;
extern crate rustc_lexer;
extern crate rustc_lint;
extern crate rustc_lint_defs;
extern crate rustc_macros;
extern crate rustc_metadata;
extern crate rustc_middle;
extern crate rustc_parse;
extern crate rustc_passes;
extern crate rustc_resolve;
extern crate rustc_serialize;
extern crate rustc_session;
extern crate rustc_span;
extern crate rustc_target;
extern crate rustc_trait_selection;
extern crate test;

// See docs in https://github.com/rust-lang/rust/blob/master/compiler/rustc/src/main.rs
// about jemalloc.
#[cfg(feature = "jemalloc")]
extern crate jemalloc_sys;

use std::env::{self, VarError};
use std::io::{self, IsTerminal};
use std::process;
use std::sync::{atomic::AtomicBool, Arc};

use rustc_driver::abort_on_err;
use rustc_errors::ErrorGuaranteed;
use rustc_interface::interface;
use rustc_middle::ty::TyCtxt;
use rustc_session::config::{make_crate_type_option, ErrorOutputType, RustcOptGroup};
use rustc_session::{getopts, EarlyErrorHandler};

use crate::clean::utils::DOC_RUST_LANG_ORG_CHANNEL;

/// A macro to create a FxHashMap.
///
/// Example:
///
/// ```ignore(cannot-test-this-because-non-exported-macro)
/// let letters = map!{"a" => "b", "c" => "d"};
/// ```
///
/// Trailing commas are allowed.
/// Commas between elements are required (even if the expression is a block).
macro_rules! map {
    ($( $key: expr => $val: expr ),* $(,)*) => {{
        let mut map = ::rustc_data_structures::fx::FxHashMap::default();
        $( map.insert($key, $val); )*
        map
    }}
}

mod clean;
mod config;
mod core;
mod docfs;
mod doctest;
mod error;
mod externalfiles;
mod fold;
mod formats;
// used by the error-index generator, so it needs to be public
pub mod html;
mod json;
pub(crate) mod lint;
mod markdown;
mod passes;
mod scrape_examples;
mod theme;
mod visit;
mod visit_ast;
mod visit_lib;

pub fn main() {
    // See docs in https://github.com/rust-lang/rust/blob/master/compiler/rustc/src/main.rs
    // about jemalloc.
    #[cfg(feature = "jemalloc")]
    {
        use std::os::raw::{c_int, c_void};

        #[used]
        static _F1: unsafe extern "C" fn(usize, usize) -> *mut c_void = jemalloc_sys::calloc;
        #[used]
        static _F2: unsafe extern "C" fn(*mut *mut c_void, usize, usize) -> c_int =
            jemalloc_sys::posix_memalign;
        #[used]
        static _F3: unsafe extern "C" fn(usize, usize) -> *mut c_void = jemalloc_sys::aligned_alloc;
        #[used]
        static _F4: unsafe extern "C" fn(usize) -> *mut c_void = jemalloc_sys::malloc;
        #[used]
        static _F5: unsafe extern "C" fn(*mut c_void, usize) -> *mut c_void = jemalloc_sys::realloc;
        #[used]
        static _F6: unsafe extern "C" fn(*mut c_void) = jemalloc_sys::free;

        #[cfg(target_os = "macos")]
        {
            extern "C" {
                fn _rjem_je_zone_register();
            }

            #[used]
            static _F7: unsafe extern "C" fn() = _rjem_je_zone_register;
        }
    }

    let mut handler = EarlyErrorHandler::new(ErrorOutputType::default());

    let using_internal_features = rustc_driver::install_ice_hook(
        "https://github.com/rust-lang/rust/issues/new\
    ?labels=C-bug%2C+I-ICE%2C+T-rustdoc&template=ice.md",
        |_| (),
    );

    // When using CI artifacts with `download-rustc`, tracing is unconditionally built
    // with `--features=static_max_level_info`, which disables almost all rustdoc logging. To avoid
    // this, compile our own version of `tracing` that logs all levels.
    // NOTE: this compiles both versions of tracing unconditionally, because
    // - The compile time hit is not that bad, especially compared to rustdoc's incremental times, and
    // - Otherwise, there's no warning that logging is being ignored when `download-rustc` is enabled
    // NOTE: The reason this doesn't show double logging when `download-rustc = false` and
    // `debug_logging = true` is because all rustc logging goes to its version of tracing (the one
    // in the sysroot), and all of rustdoc's logging goes to its version (the one in Cargo.toml).

    init_logging(&handler);
    rustc_driver::init_env_logger(&handler, "RUSTDOC_LOG");

    let exit_code = rustc_driver::catch_with_exit_code(|| match get_args(&handler) {
        Some(args) => main_args(&mut handler, &args, using_internal_features),
        _ =>
        {
            #[allow(deprecated)]
            Err(ErrorGuaranteed::unchecked_claim_error_was_emitted())
        }
    });
    process::exit(exit_code);
}

fn init_logging(handler: &EarlyErrorHandler) {
    let color_logs = match std::env::var("RUSTDOC_LOG_COLOR").as_deref() {
        Ok("always") => true,
        Ok("never") => false,
        Ok("auto") | Err(VarError::NotPresent) => io::stdout().is_terminal(),
        Ok(value) => handler.early_error(format!(
            "invalid log color value '{value}': expected one of always, never, or auto",
        )),
        Err(VarError::NotUnicode(value)) => handler.early_error(format!(
            "invalid log color value '{}': expected one of always, never, or auto",
            value.to_string_lossy()
        )),
    };
    let filter = tracing_subscriber::EnvFilter::from_env("RUSTDOC_LOG");
    let layer = tracing_tree::HierarchicalLayer::default()
        .with_writer(io::stderr)
        .with_indent_lines(true)
        .with_ansi(color_logs)
        .with_targets(true)
        .with_wraparound(10)
        .with_verbose_exit(true)
        .with_verbose_entry(true)
        .with_indent_amount(2);
    #[cfg(all(parallel_compiler, debug_assertions))]
    let layer = layer.with_thread_ids(true).with_thread_names(true);

    use tracing_subscriber::layer::SubscriberExt;
    let subscriber = tracing_subscriber::Registry::default().with(filter).with(layer);
    tracing::subscriber::set_global_default(subscriber).unwrap();
}

fn get_args(handler: &EarlyErrorHandler) -> Option<Vec<String>> {
    env::args_os()
        .enumerate()
        .map(|(i, arg)| {
            arg.into_string()
                .map_err(|arg| {
                    handler.early_warn(format!("Argument {i} is not valid Unicode: {arg:?}"));
                })
                .ok()
        })
        .collect()
}

fn opts() -> Vec<RustcOptGroup> {
    let stable: fn(_, fn(&mut getopts::Options) -> &mut _) -> _ = RustcOptGroup::stable;
    let unstable: fn(_, fn(&mut getopts::Options) -> &mut _) -> _ = RustcOptGroup::unstable;
    vec![
        stable("h", |o| o.optflagmulti("h", "help", "show this help message")),
        stable("V", |o| o.optflagmulti("V", "version", "print rustdoc's version")),
        stable("v", |o| o.optflagmulti("v", "verbose", "use verbose output")),
        stable("w", |o| o.optopt("w", "output-format", "the output type to write", "[html]")),
        stable("output", |o| {
            o.optopt(
                "",
                "output",
                "Which directory to place the output. \
                 This option is deprecated, use --out-dir instead.",
                "PATH",
            )
        }),
        stable("o", |o| o.optopt("o", "out-dir", "which directory to place the output", "PATH")),
        stable("crate-name", |o| {
            o.optopt("", "crate-name", "specify the name of this crate", "NAME")
        }),
        make_crate_type_option(),
        stable("L", |o| {
            o.optmulti("L", "library-path", "directory to add to crate search path", "DIR")
        }),
        stable("cfg", |o| o.optmulti("", "cfg", "pass a --cfg to rustc", "")),
        unstable("check-cfg", |o| o.optmulti("", "check-cfg", "pass a --check-cfg to rustc", "")),
        stable("extern", |o| o.optmulti("", "extern", "pass an --extern to rustc", "NAME[=PATH]")),
        unstable("extern-html-root-url", |o| {
            o.optmulti(
                "",
                "extern-html-root-url",
                "base URL to use for dependencies; for example, \
                 \"std=/doc\" links std::vec::Vec to /doc/std/vec/struct.Vec.html",
                "NAME=URL",
            )
        }),
        unstable("extern-html-root-takes-precedence", |o| {
            o.optflagmulti(
                "",
                "extern-html-root-takes-precedence",
                "give precedence to `--extern-html-root-url`, not `html_root_url`",
            )
        }),
        stable("C", |o| {
            o.optmulti("C", "codegen", "pass a codegen option to rustc", "OPT[=VALUE]")
        }),
        stable("document-private-items", |o| {
            o.optflagmulti("", "document-private-items", "document private items")
        }),
        unstable("document-hidden-items", |o| {
            o.optflagmulti("", "document-hidden-items", "document items that have doc(hidden)")
        }),
        stable("test", |o| o.optflagmulti("", "test", "run code examples as tests")),
        stable("test-args", |o| {
            o.optmulti("", "test-args", "arguments to pass to the test runner", "ARGS")
        }),
        stable("test-run-directory", |o| {
            o.optopt(
                "",
                "test-run-directory",
                "The working directory in which to run tests",
                "PATH",
            )
        }),
        stable("target", |o| o.optopt("", "target", "target triple to document", "TRIPLE")),
        stable("markdown-css", |o| {
            o.optmulti(
                "",
                "markdown-css",
                "CSS files to include via <link> in a rendered Markdown file",
                "FILES",
            )
        }),
        stable("html-in-header", |o| {
            o.optmulti(
                "",
                "html-in-header",
                "files to include inline in the <head> section of a rendered Markdown file \
                 or generated documentation",
                "FILES",
            )
        }),
        stable("html-before-content", |o| {
            o.optmulti(
                "",
                "html-before-content",
                "files to include inline between <body> and the content of a rendered \
                 Markdown file or generated documentation",
                "FILES",
            )
        }),
        stable("html-after-content", |o| {
            o.optmulti(
                "",
                "html-after-content",
                "files to include inline between the content and </body> of a rendered \
                 Markdown file or generated documentation",
                "FILES",
            )
        }),
        unstable("markdown-before-content", |o| {
            o.optmulti(
                "",
                "markdown-before-content",
                "files to include inline between <body> and the content of a rendered \
                 Markdown file or generated documentation",
                "FILES",
            )
        }),
        unstable("markdown-after-content", |o| {
            o.optmulti(
                "",
                "markdown-after-content",
                "files to include inline between the content and </body> of a rendered \
                 Markdown file or generated documentation",
                "FILES",
            )
        }),
        stable("markdown-playground-url", |o| {
            o.optopt("", "markdown-playground-url", "URL to send code snippets to", "URL")
        }),
        stable("markdown-no-toc", |o| {
            o.optflagmulti("", "markdown-no-toc", "don't include table of contents")
        }),
        stable("e", |o| {
            o.optopt(
                "e",
                "extend-css",
                "To add some CSS rules with a given file to generate doc with your \
                 own theme. However, your theme might break if the rustdoc's generated HTML \
                 changes, so be careful!",
                "PATH",
            )
        }),
        unstable("Z", |o| {
            o.optmulti("Z", "", "unstable / perma-unstable options (only on nightly build)", "FLAG")
        }),
        stable("sysroot", |o| o.optopt("", "sysroot", "Override the system root", "PATH")),
        unstable("playground-url", |o| {
            o.optopt(
                "",
                "playground-url",
                "URL to send code snippets to, may be reset by --markdown-playground-url \
                 or `#![doc(html_playground_url=...)]`",
                "URL",
            )
        }),
        unstable("display-doctest-warnings", |o| {
            o.optflagmulti(
                "",
                "display-doctest-warnings",
                "show warnings that originate in doctests",
            )
        }),
        stable("crate-version", |o| {
            o.optopt("", "crate-version", "crate version to print into documentation", "VERSION")
        }),
        unstable("sort-modules-by-appearance", |o| {
            o.optflagmulti(
                "",
                "sort-modules-by-appearance",
                "sort modules by where they appear in the program, rather than alphabetically",
            )
        }),
        stable("default-theme", |o| {
            o.optopt(
                "",
                "default-theme",
                "Set the default theme. THEME should be the theme name, generally lowercase. \
                 If an unknown default theme is specified, the builtin default is used. \
                 The set of themes, and the rustdoc built-in default, are not stable.",
                "THEME",
            )
        }),
        unstable("default-setting", |o| {
            o.optmulti(
                "",
                "default-setting",
                "Default value for a rustdoc setting (used when \"rustdoc-SETTING\" is absent \
                 from web browser Local Storage). If VALUE is not supplied, \"true\" is used. \
                 Supported SETTINGs and VALUEs are not documented and not stable.",
                "SETTING[=VALUE]",
            )
        }),
        stable("theme", |o| {
            o.optmulti(
                "",
                "theme",
                "additional themes which will be added to the generated docs",
                "FILES",
            )
        }),
        stable("check-theme", |o| {
            o.optmulti("", "check-theme", "check if given theme is valid", "FILES")
        }),
        unstable("resource-suffix", |o| {
            o.optopt(
                "",
                "resource-suffix",
                "suffix to add to CSS and JavaScript files, e.g., \"search-index.js\" will \
                 become \"search-index-suffix.js\"",
                "PATH",
            )
        }),
        stable("edition", |o| {
            o.optopt(
                "",
                "edition",
                "edition to use when compiling rust code (default: 2015)",
                "EDITION",
            )
        }),
        stable("color", |o| {
            o.optopt(
                "",
                "color",
                "Configure coloring of output:
                                          auto   = colorize, if output goes to a tty (default);
                                          always = always colorize output;
                                          never  = never colorize output",
                "auto|always|never",
            )
        }),
        stable("error-format", |o| {
            o.optopt(
                "",
                "error-format",
                "How errors and other messages are produced",
                "human|json|short",
            )
        }),
        stable("diagnostic-width", |o| {
            o.optopt(
                "",
                "diagnostic-width",
                "Provide width of the output for truncated error messages",
                "WIDTH",
            )
        }),
        stable("json", |o| {
            o.optopt("", "json", "Configure the structure of JSON diagnostics", "CONFIG")
        }),
        stable("allow", |o| o.optmulti("A", "allow", "Set lint allowed", "LINT")),
        stable("warn", |o| o.optmulti("W", "warn", "Set lint warnings", "LINT")),
        stable("force-warn", |o| o.optmulti("", "force-warn", "Set lint force-warn", "LINT")),
        stable("deny", |o| o.optmulti("D", "deny", "Set lint denied", "LINT")),
        stable("forbid", |o| o.optmulti("F", "forbid", "Set lint forbidden", "LINT")),
        stable("cap-lints", |o| {
            o.optmulti(
                "",
                "cap-lints",
                "Set the most restrictive lint level. \
                 More restrictive lints are capped at this \
                 level. By default, it is at `forbid` level.",
                "LEVEL",
            )
        }),
        unstable("index-page", |o| {
            o.optopt("", "index-page", "Markdown file to be used as index page", "PATH")
        }),
        unstable("enable-index-page", |o| {
            o.optflagmulti("", "enable-index-page", "To enable generation of the index page")
        }),
        unstable("static-root-path", |o| {
            o.optopt(
                "",
                "static-root-path",
                "Path string to force loading static files from in output pages. \
                 If not set, uses combinations of '../' to reach the documentation root.",
                "PATH",
            )
        }),
        unstable("persist-doctests", |o| {
            o.optopt(
                "",
                "persist-doctests",
                "Directory to persist doctest executables into",
                "PATH",
            )
        }),
        unstable("show-coverage", |o| {
            o.optflagmulti(
                "",
                "show-coverage",
                "calculate percentage of public items with documentation",
            )
        }),
        unstable("enable-per-target-ignores", |o| {
            o.optflagmulti(
                "",
                "enable-per-target-ignores",
                "parse ignore-foo for ignoring doctests on a per-target basis",
            )
        }),
        unstable("runtool", |o| {
            o.optopt(
                "",
                "runtool",
                "",
                "The tool to run tests with when building for a different target than host",
            )
        }),
        unstable("runtool-arg", |o| {
            o.optmulti(
                "",
                "runtool-arg",
                "",
                "One (of possibly many) arguments to pass to the runtool",
            )
        }),
        unstable("test-builder", |o| {
            o.optopt("", "test-builder", "The rustc-like binary to use as the test builder", "PATH")
        }),
        unstable("check", |o| o.optflagmulti("", "check", "Run rustdoc checks")),
        unstable("generate-redirect-map", |o| {
            o.optflagmulti(
                "",
                "generate-redirect-map",
                "Generate JSON file at the top level instead of generating HTML redirection files",
            )
        }),
        unstable("emit", |o| {
            o.optmulti(
                "",
                "emit",
                "Comma separated list of types of output for rustdoc to emit",
                "[unversioned-shared-resources,toolchain-shared-resources,invocation-specific]",
            )
        }),
        unstable("no-run", |o| {
            o.optflagmulti("", "no-run", "Compile doctests without running them")
        }),
        unstable("show-type-layout", |o| {
            o.optflagmulti("", "show-type-layout", "Include the memory layout of types in the docs")
        }),
        unstable("nocapture", |o| {
            o.optflag("", "nocapture", "Don't capture stdout and stderr of tests")
        }),
        unstable("generate-link-to-definition", |o| {
            o.optflag(
                "",
                "generate-link-to-definition",
                "Make the identifiers in the HTML source code pages navigable",
            )
        }),
        unstable("scrape-examples-output-path", |o| {
            o.optopt(
                "",
                "scrape-examples-output-path",
                "",
                "collect function call information and output at the given path",
            )
        }),
        unstable("scrape-examples-target-crate", |o| {
            o.optmulti(
                "",
                "scrape-examples-target-crate",
                "",
                "collect function call information for functions from the target crate",
            )
        }),
        unstable("scrape-tests", |o| {
            o.optflag("", "scrape-tests", "Include test code when scraping examples")
        }),
        unstable("with-examples", |o| {
            o.optmulti(
                "",
                "with-examples",
                "",
                "path to function call information (for displaying examples in the documentation)",
            )
        }),
        // deprecated / removed options
        unstable("disable-minification", |o| o.optflagmulti("", "disable-minification", "removed")),
        stable("plugin-path", |o| {
            o.optmulti(
                "",
                "plugin-path",
                "removed, see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
                for more information",
                "DIR",
            )
        }),
        stable("passes", |o| {
            o.optmulti(
                "",
                "passes",
                "removed, see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
                for more information",
                "PASSES",
            )
        }),
        stable("plugins", |o| {
            o.optmulti(
                "",
                "plugins",
                "removed, see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
                for more information",
                "PLUGINS",
            )
        }),
        stable("no-default", |o| {
            o.optflagmulti(
                "",
                "no-defaults",
                "removed, see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
                for more information",
            )
        }),
        stable("r", |o| {
            o.optopt(
                "r",
                "input-format",
                "removed, see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
                for more information",
                "[rust]",
            )
        }),
        unstable("html-no-source", |o| {
            o.optflag("", "html-no-source", "Disable HTML source code pages generation")
        }),
    ]
}

fn usage(argv0: &str) {
    let mut options = getopts::Options::new();
    for option in opts() {
        (option.apply)(&mut options);
    }
    println!("{}", options.usage(&format!("{argv0} [options] <input>")));
    println!("    @path               Read newline separated options from `path`\n");
    println!(
        "More information available at {DOC_RUST_LANG_ORG_CHANNEL}/rustdoc/what-is-rustdoc.html",
    );
}

/// A result type used by several functions under `main()`.
type MainResult = Result<(), ErrorGuaranteed>;

fn wrap_return(diag: &rustc_errors::Handler, res: Result<(), String>) -> MainResult {
    match res {
        Ok(()) => diag.has_errors().map_or(Ok(()), Err),
        Err(err) => {
            let reported = diag.struct_err(err).emit();
            Err(reported)
        }
    }
}

fn run_renderer<'tcx, T: formats::FormatRenderer<'tcx>>(
    krate: clean::Crate,
    renderopts: config::RenderOptions,
    cache: formats::cache::Cache,
    tcx: TyCtxt<'tcx>,
) -> MainResult {
    match formats::run_format::<T>(krate, renderopts, cache, tcx) {
        Ok(_) => tcx.sess.has_errors().map_or(Ok(()), Err),
        Err(e) => {
            let mut msg =
                tcx.sess.struct_err(format!("couldn't generate documentation: {}", e.error));
            let file = e.file.display().to_string();
            if !file.is_empty() {
                msg.note(format!("failed to create or modify \"{file}\""));
            }
            Err(msg.emit())
        }
    }
}

fn main_args(
    handler: &mut EarlyErrorHandler,
    at_args: &[String],
    using_internal_features: Arc<AtomicBool>,
) -> MainResult {
    // Throw away the first argument, the name of the binary.
    // In case of at_args being empty, as might be the case by
    // passing empty argument array to execve under some platforms,
    // just use an empty slice.
    //
    // This situation was possible before due to arg_expand_all being
    // called before removing the argument, enabling a crash by calling
    // the compiler with @empty_file as argv[0] and no more arguments.
    let at_args = at_args.get(1..).unwrap_or_default();

    let args = rustc_driver::args::arg_expand_all(handler, at_args);

    let mut options = getopts::Options::new();
    for option in opts() {
        (option.apply)(&mut options);
    }
    let matches = match options.parse(&args) {
        Ok(m) => m,
        Err(err) => {
            handler.early_error(err.to_string());
        }
    };

    // Note that we discard any distinction between different non-zero exit
    // codes from `from_matches` here.
    let (options, render_options) = match config::Options::from_matches(handler, &matches, args) {
        Ok(opts) => opts,
        Err(code) => {
            return if code == 0 {
                Ok(())
            } else {
                #[allow(deprecated)]
                Err(ErrorGuaranteed::unchecked_claim_error_was_emitted())
            };
        }
    };

    let diag = core::new_handler(
        options.error_format,
        None,
        options.diagnostic_width,
        &options.unstable_opts,
    );

    match (options.should_test, options.markdown_input()) {
        (true, true) => return wrap_return(&diag, markdown::test(options)),
        (true, false) => return doctest::run(options),
        (false, true) => {
            let input = options.input.clone();
            let edition = options.edition;
            let config = core::create_config(options, &render_options, using_internal_features);

            // `markdown::render` can invoke `doctest::make_test`, which
            // requires session globals and a thread pool, so we use
            // `run_compiler`.
            return wrap_return(
                &diag,
                interface::run_compiler(config, |_compiler| {
                    markdown::render(&input, render_options, edition)
                }),
            );
        }
        (false, false) => {}
    }

    // need to move these items separately because we lose them by the time the closure is called,
    // but we can't create the Handler ahead of time because it's not Send
    let show_coverage = options.show_coverage;
    let run_check = options.run_check;

    // First, parse the crate and extract all relevant information.
    info!("starting to run rustc");

    // Interpret the input file as a rust source file, passing it through the
    // compiler all the way through the analysis passes. The rustdoc output is
    // then generated from the cleaned AST of the crate. This runs all the
    // plug/cleaning passes.
    let crate_version = options.crate_version.clone();

    let output_format = options.output_format;
    let scrape_examples_options = options.scrape_examples_options.clone();
    let bin_crate = options.bin_crate;

    let config = core::create_config(options, &render_options, using_internal_features);

    interface::run_compiler(config, |compiler| {
        let sess = compiler.session();

        if sess.opts.describe_lints {
            let mut lint_store = rustc_lint::new_lint_store(sess.enable_internal_lints());
            let registered_lints = if let Some(register_lints) = compiler.register_lints() {
                register_lints(sess, &mut lint_store);
                true
            } else {
                false
            };
            rustc_driver::describe_lints(sess, &lint_store, registered_lints);
            return Ok(());
        }

        compiler.enter(|queries| {
            let mut gcx = abort_on_err(queries.global_ctxt(), sess);
            if sess.diagnostic().has_errors_or_lint_errors().is_some() {
                sess.fatal("Compilation failed, aborting rustdoc");
            }

            gcx.enter(|tcx| {
                let (krate, render_opts, mut cache) = sess.time("run_global_ctxt", || {
                    core::run_global_ctxt(tcx, show_coverage, render_options, output_format)
                });
                info!("finished with rustc");

                if let Some(options) = scrape_examples_options {
                    return scrape_examples::run(
                        krate,
                        render_opts,
                        cache,
                        tcx,
                        options,
                        bin_crate,
                    );
                }

                cache.crate_version = crate_version;

                if show_coverage {
                    // if we ran coverage, bail early, we don't need to also generate docs at this point
                    // (also we didn't load in any of the useful passes)
                    return Ok(());
                } else if run_check {
                    // Since we're in "check" mode, no need to generate anything beyond this point.
                    return Ok(());
                }

                info!("going to format");
                match output_format {
                    config::OutputFormat::Html => sess.time("render_html", || {
                        run_renderer::<html::render::Context<'_>>(krate, render_opts, cache, tcx)
                    }),
                    config::OutputFormat::Json => sess.time("render_json", || {
                        run_renderer::<json::JsonRenderer<'_>>(krate, render_opts, cache, tcx)
                    }),
                }
            })
        })
    })
}