rustc_driver_impl/
pretty.rs

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
//! The various pretty-printing routines.

use std::cell::Cell;
use std::fmt::Write;

use rustc_ast_pretty::pprust as pprust_ast;
use rustc_errors::FatalError;
use rustc_middle::bug;
use rustc_middle::mir::{write_mir_graphviz, write_mir_pretty};
use rustc_middle::ty::{self, TyCtxt};
use rustc_session::Session;
use rustc_session::config::{OutFileName, PpHirMode, PpMode, PpSourceMode};
use rustc_smir::rustc_internal::pretty::write_smir_pretty;
use rustc_span::FileName;
use rustc_span::symbol::Ident;
use tracing::debug;
use {rustc_ast as ast, rustc_hir_pretty as pprust_hir};

pub use self::PpMode::*;
pub use self::PpSourceMode::*;

struct AstNoAnn;

impl pprust_ast::PpAnn for AstNoAnn {}

struct AstIdentifiedAnn;

impl pprust_ast::PpAnn for AstIdentifiedAnn {
    fn pre(&self, s: &mut pprust_ast::State<'_>, node: pprust_ast::AnnNode<'_>) {
        if let pprust_ast::AnnNode::Expr(_) = node {
            s.popen();
        }
    }

    fn post(&self, s: &mut pprust_ast::State<'_>, node: pprust_ast::AnnNode<'_>) {
        match node {
            pprust_ast::AnnNode::Crate(_)
            | pprust_ast::AnnNode::Ident(_)
            | pprust_ast::AnnNode::Name(_) => {}

            pprust_ast::AnnNode::Item(item) => {
                s.s.space();
                s.synth_comment(item.id.to_string())
            }
            pprust_ast::AnnNode::SubItem(id) => {
                s.s.space();
                s.synth_comment(id.to_string())
            }
            pprust_ast::AnnNode::Block(blk) => {
                s.s.space();
                s.synth_comment(format!("block {}", blk.id))
            }
            pprust_ast::AnnNode::Expr(expr) => {
                s.s.space();
                s.synth_comment(expr.id.to_string());
                s.pclose()
            }
            pprust_ast::AnnNode::Pat(pat) => {
                s.s.space();
                s.synth_comment(format!("pat {}", pat.id));
            }
        }
    }
}

struct HirIdentifiedAnn<'tcx> {
    tcx: TyCtxt<'tcx>,
}

impl<'tcx> pprust_hir::PpAnn for HirIdentifiedAnn<'tcx> {
    fn nested(&self, state: &mut pprust_hir::State<'_>, nested: pprust_hir::Nested) {
        self.tcx.nested(state, nested)
    }

    fn pre(&self, s: &mut pprust_hir::State<'_>, node: pprust_hir::AnnNode<'_>) {
        if let pprust_hir::AnnNode::Expr(_) = node {
            s.popen();
        }
    }

    fn post(&self, s: &mut pprust_hir::State<'_>, node: pprust_hir::AnnNode<'_>) {
        match node {
            pprust_hir::AnnNode::Name(_) => {}
            pprust_hir::AnnNode::Item(item) => {
                s.s.space();
                s.synth_comment(format!("hir_id: {}", item.hir_id()));
            }
            pprust_hir::AnnNode::SubItem(id) => {
                s.s.space();
                s.synth_comment(id.to_string());
            }
            pprust_hir::AnnNode::Block(blk) => {
                s.s.space();
                s.synth_comment(format!("block hir_id: {}", blk.hir_id));
            }
            pprust_hir::AnnNode::Expr(expr) => {
                s.s.space();
                s.synth_comment(format!("expr hir_id: {}", expr.hir_id));
                s.pclose();
            }
            pprust_hir::AnnNode::Pat(pat) => {
                s.s.space();
                s.synth_comment(format!("pat hir_id: {}", pat.hir_id));
            }
            pprust_hir::AnnNode::Arm(arm) => {
                s.s.space();
                s.synth_comment(format!("arm hir_id: {}", arm.hir_id));
            }
        }
    }
}

struct AstHygieneAnn<'a> {
    sess: &'a Session,
}

impl<'a> pprust_ast::PpAnn for AstHygieneAnn<'a> {
    fn post(&self, s: &mut pprust_ast::State<'_>, node: pprust_ast::AnnNode<'_>) {
        match node {
            pprust_ast::AnnNode::Ident(&Ident { name, span }) => {
                s.s.space();
                s.synth_comment(format!("{}{:?}", name.as_u32(), span.ctxt()))
            }
            pprust_ast::AnnNode::Name(&name) => {
                s.s.space();
                s.synth_comment(name.as_u32().to_string())
            }
            pprust_ast::AnnNode::Crate(_) => {
                s.s.hardbreak();
                let verbose = self.sess.verbose_internals();
                s.synth_comment(rustc_span::hygiene::debug_hygiene_data(verbose));
                s.s.hardbreak_if_not_bol();
            }
            _ => {}
        }
    }
}

struct HirTypedAnn<'tcx> {
    tcx: TyCtxt<'tcx>,
    maybe_typeck_results: Cell<Option<&'tcx ty::TypeckResults<'tcx>>>,
}

impl<'tcx> pprust_hir::PpAnn for HirTypedAnn<'tcx> {
    fn nested(&self, state: &mut pprust_hir::State<'_>, nested: pprust_hir::Nested) {
        let old_maybe_typeck_results = self.maybe_typeck_results.get();
        if let pprust_hir::Nested::Body(id) = nested {
            self.maybe_typeck_results.set(Some(self.tcx.typeck_body(id)));
        }
        self.tcx.nested(state, nested);
        self.maybe_typeck_results.set(old_maybe_typeck_results);
    }

    fn pre(&self, s: &mut pprust_hir::State<'_>, node: pprust_hir::AnnNode<'_>) {
        if let pprust_hir::AnnNode::Expr(_) = node {
            s.popen();
        }
    }

    fn post(&self, s: &mut pprust_hir::State<'_>, node: pprust_hir::AnnNode<'_>) {
        if let pprust_hir::AnnNode::Expr(expr) = node {
            let typeck_results = self.maybe_typeck_results.get().or_else(|| {
                self.tcx
                    .hir()
                    .maybe_body_owned_by(expr.hir_id.owner.def_id)
                    .map(|body_id| self.tcx.typeck_body(body_id.id()))
            });

            if let Some(typeck_results) = typeck_results {
                s.s.space();
                s.s.word("as");
                s.s.space();
                s.s.word(typeck_results.expr_ty(expr).to_string());
            }

            s.pclose();
        }
    }
}

fn get_source(sess: &Session) -> (String, FileName) {
    let src_name = sess.io.input.source_name();
    let src = String::clone(
        sess.source_map()
            .get_source_file(&src_name)
            .expect("get_source_file")
            .src
            .as_ref()
            .expect("src"),
    );
    (src, src_name)
}

fn write_or_print(out: &str, sess: &Session) {
    sess.io.output_file.as_ref().unwrap_or(&OutFileName::Stdout).overwrite(out, sess);
}

// Extra data for pretty-printing, the form of which depends on what kind of
// pretty-printing we are doing.
pub enum PrintExtra<'tcx> {
    AfterParsing { krate: &'tcx ast::Crate },
    NeedsAstMap { tcx: TyCtxt<'tcx> },
}

impl<'tcx> PrintExtra<'tcx> {
    fn with_krate<F, R>(&self, f: F) -> R
    where
        F: FnOnce(&ast::Crate) -> R,
    {
        match self {
            PrintExtra::AfterParsing { krate, .. } => f(krate),
            PrintExtra::NeedsAstMap { tcx } => f(&tcx.resolver_for_lowering().borrow().1),
        }
    }

    fn tcx(&self) -> TyCtxt<'tcx> {
        match self {
            PrintExtra::AfterParsing { .. } => bug!("PrintExtra::tcx"),
            PrintExtra::NeedsAstMap { tcx } => *tcx,
        }
    }
}

pub fn print<'tcx>(sess: &Session, ppm: PpMode, ex: PrintExtra<'tcx>) {
    if ppm.needs_analysis() {
        ex.tcx().ensure().analysis(());
    }

    let (src, src_name) = get_source(sess);

    let out = match ppm {
        Source(s) => {
            debug!("pretty printing source code {:?}", s);
            let annotation: Box<dyn pprust_ast::PpAnn> = match s {
                Normal => Box::new(AstNoAnn),
                Expanded => Box::new(AstNoAnn),
                Identified => Box::new(AstIdentifiedAnn),
                ExpandedIdentified => Box::new(AstIdentifiedAnn),
                ExpandedHygiene => Box::new(AstHygieneAnn { sess }),
            };
            let psess = &sess.psess;
            let is_expanded = ppm.needs_ast_map();
            ex.with_krate(|krate| {
                pprust_ast::print_crate(
                    sess.source_map(),
                    krate,
                    src_name,
                    src,
                    &*annotation,
                    is_expanded,
                    psess.edition,
                    &sess.psess.attr_id_generator,
                )
            })
        }
        AstTree => {
            debug!("pretty printing AST tree");
            ex.with_krate(|krate| format!("{krate:#?}"))
        }
        AstTreeExpanded => {
            debug!("pretty-printing expanded AST");
            format!("{:#?}", ex.tcx().resolver_for_lowering().borrow().1)
        }
        Hir(s) => {
            debug!("pretty printing HIR {:?}", s);
            let tcx = ex.tcx();
            let f = |annotation: &dyn pprust_hir::PpAnn| {
                let sm = sess.source_map();
                let hir_map = tcx.hir();
                let attrs = |id| hir_map.attrs(id);
                pprust_hir::print_crate(
                    sm,
                    hir_map.root_module(),
                    src_name,
                    src,
                    &attrs,
                    annotation,
                )
            };
            match s {
                PpHirMode::Normal => f(&tcx),
                PpHirMode::Identified => {
                    let annotation = HirIdentifiedAnn { tcx };
                    f(&annotation)
                }
                PpHirMode::Typed => {
                    let annotation = HirTypedAnn { tcx, maybe_typeck_results: Cell::new(None) };
                    tcx.dep_graph.with_ignore(|| f(&annotation))
                }
            }
        }
        HirTree => {
            debug!("pretty printing HIR tree");
            format!("{:#?}", ex.tcx().hir().krate())
        }
        Mir => {
            let mut out = Vec::new();
            write_mir_pretty(ex.tcx(), None, &mut out).unwrap();
            String::from_utf8(out).unwrap()
        }
        MirCFG => {
            let mut out = Vec::new();
            write_mir_graphviz(ex.tcx(), None, &mut out).unwrap();
            String::from_utf8(out).unwrap()
        }
        StableMir => {
            let mut out = Vec::new();
            write_smir_pretty(ex.tcx(), &mut out).unwrap();
            String::from_utf8(out).unwrap()
        }
        ThirTree => {
            let tcx = ex.tcx();
            let mut out = String::new();
            rustc_hir_analysis::check_crate(tcx);
            if tcx.dcx().has_errors().is_some() {
                FatalError.raise();
            }
            debug!("pretty printing THIR tree");
            for did in tcx.hir().body_owners() {
                let _ = writeln!(out, "{:?}:\n{}\n", did, tcx.thir_tree(did));
            }
            out
        }
        ThirFlat => {
            let tcx = ex.tcx();
            let mut out = String::new();
            rustc_hir_analysis::check_crate(tcx);
            if tcx.dcx().has_errors().is_some() {
                FatalError.raise();
            }
            debug!("pretty printing THIR flat");
            for did in tcx.hir().body_owners() {
                let _ = writeln!(out, "{:?}:\n{}\n", did, tcx.thir_flat(did));
            }
            out
        }
    };

    write_or_print(&out, sess);
}