1 //! This module provides the [CommentWriter] which makes it possible
2 //! to add comments to the written cranelift ir.
10 //! function u0:0(i64, i64, i64) system_v {
11 //! ; symbol _ZN119_$LT$example..IsNotEmpty$u20$as$u20$mini_core..FnOnce$LT$$LP$$RF$$u27$a$u20$$RF$$u27$b$u20$$u5b$u16$u5d$$C$$RP$$GT$$GT$9call_once17he85059d5e6a760a0E
12 //! ; instance Instance { def: Item(DefId(0/0:29 ~ example[8787]::{{impl}}[0]::call_once[0])), substs: [ReErased, ReErased] }
13 //! ; sig ([IsNotEmpty, (&&[u16],)]; c_variadic: false)->(u8, u8)
15 //! ; ssa {_2: NOT_SSA, _4: NOT_SSA, _0: NOT_SSA, _3: (empty), _1: NOT_SSA}
16 //! ; msg loc.idx param pass mode ssa flags ty
17 //! ; ret _0 = v0 ByRef NOT_SSA (u8, u8)
18 //! ; arg _1 = v1 ByRef NOT_SSA IsNotEmpty
19 //! ; arg _2.0 = v2 ByVal(types::I64) NOT_SSA &&[u16]
21 //! ss0 = explicit_slot 0 ; _1: IsNotEmpty size=0 align=1,8
22 //! ss1 = explicit_slot 8 ; _2: (&&[u16],) size=8 align=8,8
23 //! ss2 = explicit_slot 8 ; _4: (&&[u16],) size=8 align=8,8
24 //! sig0 = (i64, i64, i64) system_v
25 //! sig1 = (i64, i64, i64) system_v
26 //! fn0 = colocated u0:6 sig1 ; Instance { def: Item(DefId(0/0:31 ~ example[8787]::{{impl}}[1]::call_mut[0])), substs: [ReErased, ReErased] }
28 //! block0(v0: i64, v1: i64, v2: i64):
29 //! v3 = stack_addr.i64 ss0
30 //! v4 = stack_addr.i64 ss1
32 //! v5 = stack_addr.i64 ss2
42 //! ; _0 = const mini_core::FnMut::call_mut(move _3, move _4)
44 //! call fn0(v0, v3, v7)
58 use cranelift_codegen::{
60 ir::{entities::AnyEntity, function::DisplayFunctionAnnotations},
61 write::{FuncWriter, PlainWriter},
64 use rustc_middle::ty::layout::FnAbiExt;
65 use rustc_session::config::OutputType;
66 use rustc_target::abi::call::FnAbi;
68 use crate::prelude::*;
71 pub(crate) struct CommentWriter {
72 global_comments: Vec<String>,
73 entity_comments: FxHashMap<AnyEntity, String>,
77 pub(crate) fn new<'tcx>(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> Self {
78 let global_comments = if cfg!(debug_assertions) {
80 format!("symbol {}", tcx.symbol_name(instance).name),
81 format!("instance {:?}", instance),
84 FnAbi::of_instance(&RevealAllLayoutCx(tcx), instance, &[])
94 entity_comments: FxHashMap::default(),
99 #[cfg(debug_assertions)]
101 pub(crate) fn add_global_comment<S: Into<String>>(&mut self, comment: S) {
102 self.global_comments.push(comment.into());
105 pub(crate) fn add_comment<S: Into<String> + AsRef<str>, E: Into<AnyEntity>>(
110 use std::collections::hash_map::Entry;
111 match self.entity_comments.entry(entity.into()) {
112 Entry::Occupied(mut occ) => {
113 occ.get_mut().push('\n');
114 occ.get_mut().push_str(comment.as_ref());
116 Entry::Vacant(vac) => {
117 vac.insert(comment.into());
123 impl FuncWriter for &'_ CommentWriter {
126 w: &mut dyn fmt::Write,
128 reg_info: Option<&isa::RegInfo>,
129 ) -> Result<bool, fmt::Error> {
130 for comment in &self.global_comments {
131 if !comment.is_empty() {
132 writeln!(w, "; {}", comment)?;
137 if !self.global_comments.is_empty() {
141 self.super_preamble(w, func, reg_info)
144 fn write_entity_definition(
146 w: &mut dyn fmt::Write,
149 value: &dyn fmt::Display,
151 write!(w, " {} = {}", entity, value)?;
153 if let Some(comment) = self.entity_comments.get(&entity) {
154 writeln!(w, " ; {}", comment.replace('\n', "\n; "))
160 fn write_block_header(
162 w: &mut dyn fmt::Write,
164 isa: Option<&dyn isa::TargetIsa>,
168 PlainWriter.write_block_header(w, func, isa, block, indent)
171 fn write_instruction(
173 w: &mut dyn fmt::Write,
175 aliases: &SecondaryMap<Value, Vec<Value>>,
176 isa: Option<&dyn isa::TargetIsa>,
180 PlainWriter.write_instruction(w, func, aliases, isa, inst, indent)?;
181 if let Some(comment) = self.entity_comments.get(&inst.into()) {
182 writeln!(w, "; {}", comment.replace('\n', "\n; "))?;
188 #[cfg(debug_assertions)]
189 impl<M: Module> FunctionCx<'_, '_, M> {
190 pub(crate) fn add_global_comment<S: Into<String>>(&mut self, comment: S) {
191 self.clif_comments.add_global_comment(comment);
194 pub(crate) fn add_comment<S: Into<String> + AsRef<str>, E: Into<AnyEntity>>(
199 self.clif_comments.add_comment(entity, comment);
203 pub(crate) fn should_write_ir(tcx: TyCtxt<'_>) -> bool {
204 cfg!(debug_assertions)
209 .contains_key(&OutputType::LlvmAssembly)
212 pub(crate) fn write_ir_file<'tcx>(
215 write: impl FnOnce(&mut dyn Write) -> std::io::Result<()>,
217 if !should_write_ir(tcx) {
221 let clif_output_dir = tcx.output_filenames(LOCAL_CRATE).with_extension("clif");
223 match std::fs::create_dir(&clif_output_dir) {
225 Err(err) if err.kind() == std::io::ErrorKind::AlreadyExists => {}
226 res @ Err(_) => res.unwrap(),
229 let clif_file_name = clif_output_dir.join(name);
231 let res: std::io::Result<()> = try {
232 let mut file = std::fs::File::create(clif_file_name)?;
235 if let Err(err) = res {
236 tcx.sess.warn(&format!("error writing ir file: {}", err));
240 pub(crate) fn write_clif_file<'tcx>(
243 isa: Option<&dyn cranelift_codegen::isa::TargetIsa>,
244 instance: Instance<'tcx>,
245 context: &cranelift_codegen::Context,
246 mut clif_comments: &CommentWriter,
250 &format!("{}.{}.clif", tcx.symbol_name(instance).name, postfix),
252 let value_ranges = isa.map(|isa| {
254 .build_value_labels_ranges(isa)
255 .expect("value location ranges")
258 let mut clif = String::new();
259 cranelift_codegen::write::decorate_function(
263 &DisplayFunctionAnnotations {
264 isa: Some(&*crate::build_isa(tcx.sess)),
265 value_ranges: value_ranges.as_ref(),
270 writeln!(file, "test compile")?;
271 writeln!(file, "set is_pic")?;
272 writeln!(file, "set enable_simd")?;
273 writeln!(file, "target {} haswell", crate::target_triple(tcx.sess))?;
275 file.write_all(clif.as_bytes())?;
281 impl<M: Module> fmt::Debug for FunctionCx<'_, '_, M> {
282 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
283 writeln!(f, "{:?}", self.instance.substs)?;
284 writeln!(f, "{:?}", self.local_map)?;
286 let mut clif = String::new();
287 ::cranelift_codegen::write::decorate_function(
288 &mut &self.clif_comments,
291 &DisplayFunctionAnnotations::default(),
294 writeln!(f, "\n{}", clif)