1289 lines
50 KiB
Rust
1289 lines
50 KiB
Rust
//! Types for tracking pieces of source code within a crate.
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//!
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//! The [`SourceMap`] tracks all the source code used within a single crate, mapping
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//! from integer byte positions to the original source code location. Each bit
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//! of source parsed during crate parsing (typically files, in-memory strings,
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//! or various bits of macro expansion) cover a continuous range of bytes in the
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//! `SourceMap` and are represented by [`SourceFile`]s. Byte positions are stored in
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//! [`Span`] and used pervasively in the compiler. They are absolute positions
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//! within the `SourceMap`, which upon request can be converted to line and column
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//! information, source code snippets, etc.
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use crate::*;
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use rustc_data_structures::sync::{IntoDynSyncSend, MappedReadGuard, ReadGuard, RwLock};
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use rustc_data_structures::unhash::UnhashMap;
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use std::fs;
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use std::io::{self, BorrowedBuf, Read};
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use std::path::{self};
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#[cfg(test)]
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mod tests;
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/// Returns the span itself if it doesn't come from a macro expansion,
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/// otherwise return the call site span up to the `enclosing_sp` by
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/// following the `expn_data` chain.
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pub fn original_sp(sp: Span, enclosing_sp: Span) -> Span {
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let ctxt = sp.ctxt();
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if ctxt.is_root() {
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return sp;
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}
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let enclosing_ctxt = enclosing_sp.ctxt();
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let expn_data1 = ctxt.outer_expn_data();
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if !enclosing_ctxt.is_root()
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&& expn_data1.call_site == enclosing_ctxt.outer_expn_data().call_site
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{
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sp
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} else {
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original_sp(expn_data1.call_site, enclosing_sp)
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}
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}
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mod monotonic {
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use std::ops::{Deref, DerefMut};
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/// A `MonotonicVec` is a `Vec` which can only be grown.
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/// Once inserted, an element can never be removed or swapped,
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/// guaranteeing that any indices into a `MonotonicVec` are stable
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// This is declared in its own module to ensure that the private
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// field is inaccessible
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pub struct MonotonicVec<T>(Vec<T>);
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impl<T> MonotonicVec<T> {
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pub(super) fn push(&mut self, val: T) {
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self.0.push(val);
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}
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}
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impl<T> Default for MonotonicVec<T> {
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fn default() -> Self {
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MonotonicVec(vec![])
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}
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}
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impl<T> Deref for MonotonicVec<T> {
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type Target = Vec<T>;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl<T> !DerefMut for MonotonicVec<T> {}
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}
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#[derive(Clone, Encodable, Decodable, Debug, Copy, PartialEq, Hash, HashStable_Generic)]
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pub struct Spanned<T> {
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pub node: T,
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pub span: Span,
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}
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pub fn respan<T>(sp: Span, t: T) -> Spanned<T> {
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Spanned { node: t, span: sp }
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}
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pub fn dummy_spanned<T>(t: T) -> Spanned<T> {
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respan(DUMMY_SP, t)
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}
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// _____________________________________________________________________________
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// SourceFile, MultiByteChar, FileName, FileLines
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//
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/// An abstraction over the fs operations used by the Parser.
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pub trait FileLoader {
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/// Query the existence of a file.
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fn file_exists(&self, path: &Path) -> bool;
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/// Read the contents of a UTF-8 file into memory.
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/// This function must return a String because we normalize
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/// source files, which may require resizing.
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fn read_file(&self, path: &Path) -> io::Result<String>;
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/// Read the contents of a potentially non-UTF-8 file into memory.
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/// We don't normalize binary files, so we can start in an Lrc.
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fn read_binary_file(&self, path: &Path) -> io::Result<Lrc<[u8]>>;
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}
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/// A FileLoader that uses std::fs to load real files.
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pub struct RealFileLoader;
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impl FileLoader for RealFileLoader {
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fn file_exists(&self, path: &Path) -> bool {
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path.exists()
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}
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fn read_file(&self, path: &Path) -> io::Result<String> {
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fs::read_to_string(path)
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}
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fn read_binary_file(&self, path: &Path) -> io::Result<Lrc<[u8]>> {
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let mut file = fs::File::open(path)?;
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let len = file.metadata()?.len();
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let mut bytes = Lrc::new_uninit_slice(len as usize);
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let mut buf = BorrowedBuf::from(Lrc::get_mut(&mut bytes).unwrap());
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match file.read_buf_exact(buf.unfilled()) {
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Ok(()) => {}
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Err(e) if e.kind() == io::ErrorKind::UnexpectedEof => {
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drop(bytes);
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return fs::read(path).map(Vec::into);
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}
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Err(e) => return Err(e),
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}
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// SAFETY: If the read_buf_exact call returns Ok(()), then we have
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// read len bytes and initialized the buffer.
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let bytes = unsafe { bytes.assume_init() };
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// At this point, we've read all the bytes that filesystem metadata reported exist.
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// But we are not guaranteed to be at the end of the file, because we did not attempt to do
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// a read with a non-zero-sized buffer and get Ok(0).
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// So we do small read to a fixed-size buffer. If the read returns no bytes then we're
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// already done, and we just return the Lrc we built above.
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// If the read returns bytes however, we just fall back to reading into a Vec then turning
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// that into an Lrc, losing our nice peak memory behavior. This fallback code path should
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// be rarely exercised.
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let mut probe = [0u8; 32];
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let n = loop {
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match file.read(&mut probe) {
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Ok(0) => return Ok(bytes),
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Err(e) if e.kind() == io::ErrorKind::Interrupted => continue,
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Err(e) => return Err(e),
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Ok(n) => break n,
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}
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};
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let mut bytes: Vec<u8> = bytes.iter().copied().chain(probe[..n].iter().copied()).collect();
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file.read_to_end(&mut bytes)?;
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Ok(bytes.into())
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}
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}
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// _____________________________________________________________________________
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// SourceMap
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//
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#[derive(Default)]
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struct SourceMapFiles {
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source_files: monotonic::MonotonicVec<Lrc<SourceFile>>,
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stable_id_to_source_file: UnhashMap<StableSourceFileId, Lrc<SourceFile>>,
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}
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pub struct SourceMap {
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files: RwLock<SourceMapFiles>,
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file_loader: IntoDynSyncSend<Box<dyn FileLoader + Sync + Send>>,
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// This is used to apply the file path remapping as specified via
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// `--remap-path-prefix` to all `SourceFile`s allocated within this `SourceMap`.
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path_mapping: FilePathMapping,
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/// The algorithm used for hashing the contents of each source file.
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hash_kind: SourceFileHashAlgorithm,
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}
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impl SourceMap {
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pub fn new(path_mapping: FilePathMapping) -> SourceMap {
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Self::with_file_loader_and_hash_kind(
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Box::new(RealFileLoader),
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path_mapping,
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SourceFileHashAlgorithm::Md5,
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)
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}
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pub fn with_file_loader_and_hash_kind(
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file_loader: Box<dyn FileLoader + Sync + Send>,
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path_mapping: FilePathMapping,
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hash_kind: SourceFileHashAlgorithm,
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) -> SourceMap {
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SourceMap {
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files: Default::default(),
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file_loader: IntoDynSyncSend(file_loader),
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path_mapping,
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hash_kind,
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}
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}
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pub fn path_mapping(&self) -> &FilePathMapping {
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&self.path_mapping
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}
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pub fn file_exists(&self, path: &Path) -> bool {
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self.file_loader.file_exists(path)
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}
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pub fn load_file(&self, path: &Path) -> io::Result<Lrc<SourceFile>> {
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let src = self.file_loader.read_file(path)?;
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let filename = path.to_owned().into();
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Ok(self.new_source_file(filename, src))
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}
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/// Loads source file as a binary blob.
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///
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/// Unlike `load_file`, guarantees that no normalization like BOM-removal
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/// takes place.
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pub fn load_binary_file(&self, path: &Path) -> io::Result<Lrc<[u8]>> {
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let bytes = self.file_loader.read_binary_file(path)?;
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// We need to add file to the `SourceMap`, so that it is present
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// in dep-info. There's also an edge case that file might be both
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// loaded as a binary via `include_bytes!` and as proper `SourceFile`
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// via `mod`, so we try to use real file contents and not just an
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// empty string.
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let text = std::str::from_utf8(&bytes).unwrap_or("").to_string();
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self.new_source_file(path.to_owned().into(), text);
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Ok(bytes)
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}
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// By returning a `MonotonicVec`, we ensure that consumers cannot invalidate
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// any existing indices pointing into `files`.
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pub fn files(&self) -> MappedReadGuard<'_, monotonic::MonotonicVec<Lrc<SourceFile>>> {
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ReadGuard::map(self.files.borrow(), |files| &files.source_files)
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}
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pub fn source_file_by_stable_id(
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&self,
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stable_id: StableSourceFileId,
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) -> Option<Lrc<SourceFile>> {
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self.files.borrow().stable_id_to_source_file.get(&stable_id).cloned()
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}
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fn register_source_file(
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&self,
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file_id: StableSourceFileId,
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mut file: SourceFile,
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) -> Result<Lrc<SourceFile>, OffsetOverflowError> {
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let mut files = self.files.borrow_mut();
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file.start_pos = BytePos(if let Some(last_file) = files.source_files.last() {
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// Add one so there is some space between files. This lets us distinguish
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// positions in the `SourceMap`, even in the presence of zero-length files.
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last_file.end_position().0.checked_add(1).ok_or(OffsetOverflowError)?
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} else {
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0
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});
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let file = Lrc::new(file);
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files.source_files.push(file.clone());
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files.stable_id_to_source_file.insert(file_id, file.clone());
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Ok(file)
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}
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/// Creates a new `SourceFile`.
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/// If a file already exists in the `SourceMap` with the same ID, that file is returned
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/// unmodified.
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pub fn new_source_file(&self, filename: FileName, src: String) -> Lrc<SourceFile> {
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self.try_new_source_file(filename, src).unwrap_or_else(|OffsetOverflowError| {
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eprintln!("fatal error: rustc does not support files larger than 4GB");
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crate::fatal_error::FatalError.raise()
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})
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}
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fn try_new_source_file(
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&self,
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filename: FileName,
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src: String,
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) -> Result<Lrc<SourceFile>, OffsetOverflowError> {
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// Note that filename may not be a valid path, eg it may be `<anon>` etc,
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// but this is okay because the directory determined by `path.pop()` will
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// be empty, so the working directory will be used.
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let (filename, _) = self.path_mapping.map_filename_prefix(&filename);
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let stable_id = StableSourceFileId::from_filename_in_current_crate(&filename);
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match self.source_file_by_stable_id(stable_id) {
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Some(lrc_sf) => Ok(lrc_sf),
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None => {
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let source_file = SourceFile::new(filename, src, self.hash_kind)?;
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// Let's make sure the file_id we generated above actually matches
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// the ID we generate for the SourceFile we just created.
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debug_assert_eq!(source_file.stable_id, stable_id);
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self.register_source_file(stable_id, source_file)
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}
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}
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}
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/// Allocates a new `SourceFile` representing a source file from an external
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/// crate. The source code of such an "imported `SourceFile`" is not available,
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/// but we still know enough to generate accurate debuginfo location
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/// information for things inlined from other crates.
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pub fn new_imported_source_file(
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&self,
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filename: FileName,
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src_hash: SourceFileHash,
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stable_id: StableSourceFileId,
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source_len: u32,
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cnum: CrateNum,
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file_local_lines: FreezeLock<SourceFileLines>,
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multibyte_chars: Vec<MultiByteChar>,
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non_narrow_chars: Vec<NonNarrowChar>,
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normalized_pos: Vec<NormalizedPos>,
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metadata_index: u32,
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) -> Lrc<SourceFile> {
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let source_len = RelativeBytePos::from_u32(source_len);
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let source_file = SourceFile {
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name: filename,
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src: None,
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src_hash,
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external_src: FreezeLock::new(ExternalSource::Foreign {
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kind: ExternalSourceKind::AbsentOk,
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metadata_index,
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}),
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start_pos: BytePos(0),
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source_len,
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lines: file_local_lines,
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multibyte_chars,
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non_narrow_chars,
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normalized_pos,
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stable_id,
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cnum,
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};
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self.register_source_file(stable_id, source_file)
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.expect("not enough address space for imported source file")
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}
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/// If there is a doctest offset, applies it to the line.
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pub fn doctest_offset_line(&self, file: &FileName, orig: usize) -> usize {
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match file {
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FileName::DocTest(_, offset) => {
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if *offset < 0 {
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orig - (-(*offset)) as usize
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} else {
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orig + *offset as usize
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}
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}
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_ => orig,
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}
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}
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/// Return the SourceFile that contains the given `BytePos`
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pub fn lookup_source_file(&self, pos: BytePos) -> Lrc<SourceFile> {
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let idx = self.lookup_source_file_idx(pos);
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(*self.files.borrow().source_files)[idx].clone()
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}
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/// Looks up source information about a `BytePos`.
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pub fn lookup_char_pos(&self, pos: BytePos) -> Loc {
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let sf = self.lookup_source_file(pos);
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let (line, col, col_display) = sf.lookup_file_pos_with_col_display(pos);
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Loc { file: sf, line, col, col_display }
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}
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/// If the corresponding `SourceFile` is empty, does not return a line number.
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pub fn lookup_line(&self, pos: BytePos) -> Result<SourceFileAndLine, Lrc<SourceFile>> {
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let f = self.lookup_source_file(pos);
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let pos = f.relative_position(pos);
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match f.lookup_line(pos) {
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Some(line) => Ok(SourceFileAndLine { sf: f, line }),
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None => Err(f),
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}
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}
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pub fn span_to_string(
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&self,
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sp: Span,
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filename_display_pref: FileNameDisplayPreference,
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) -> String {
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let (source_file, lo_line, lo_col, hi_line, hi_col) = self.span_to_location_info(sp);
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let file_name = match source_file {
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Some(sf) => sf.name.display(filename_display_pref).to_string(),
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None => return "no-location".to_string(),
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};
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format!(
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"{file_name}:{lo_line}:{lo_col}{}",
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if let FileNameDisplayPreference::Short = filename_display_pref {
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String::new()
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} else {
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format!(": {hi_line}:{hi_col}")
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}
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)
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}
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pub fn span_to_location_info(
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&self,
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sp: Span,
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) -> (Option<Lrc<SourceFile>>, usize, usize, usize, usize) {
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if self.files.borrow().source_files.is_empty() || sp.is_dummy() {
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return (None, 0, 0, 0, 0);
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}
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let lo = self.lookup_char_pos(sp.lo());
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let hi = self.lookup_char_pos(sp.hi());
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(Some(lo.file), lo.line, lo.col.to_usize() + 1, hi.line, hi.col.to_usize() + 1)
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}
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/// Format the span location suitable for embedding in build artifacts
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pub fn span_to_embeddable_string(&self, sp: Span) -> String {
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self.span_to_string(sp, FileNameDisplayPreference::Remapped)
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}
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|
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/// Format the span location to be printed in diagnostics. Must not be emitted
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/// to build artifacts as this may leak local file paths. Use span_to_embeddable_string
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/// for string suitable for embedding.
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pub fn span_to_diagnostic_string(&self, sp: Span) -> String {
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self.span_to_string(sp, self.path_mapping.filename_display_for_diagnostics)
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}
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|
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pub fn span_to_filename(&self, sp: Span) -> FileName {
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self.lookup_char_pos(sp.lo()).file.name.clone()
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}
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pub fn filename_for_diagnostics<'a>(&self, filename: &'a FileName) -> FileNameDisplay<'a> {
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filename.display(self.path_mapping.filename_display_for_diagnostics)
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}
|
|
|
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pub fn is_multiline(&self, sp: Span) -> bool {
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let lo = self.lookup_source_file_idx(sp.lo());
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let hi = self.lookup_source_file_idx(sp.hi());
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if lo != hi {
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return true;
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}
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let f = (*self.files.borrow().source_files)[lo].clone();
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let lo = f.relative_position(sp.lo());
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let hi = f.relative_position(sp.hi());
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f.lookup_line(lo) != f.lookup_line(hi)
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}
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|
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#[instrument(skip(self), level = "trace")]
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pub fn is_valid_span(&self, sp: Span) -> Result<(Loc, Loc), SpanLinesError> {
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let lo = self.lookup_char_pos(sp.lo());
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trace!(?lo);
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let hi = self.lookup_char_pos(sp.hi());
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trace!(?hi);
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if lo.file.start_pos != hi.file.start_pos {
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return Err(SpanLinesError::DistinctSources(Box::new(DistinctSources {
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begin: (lo.file.name.clone(), lo.file.start_pos),
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end: (hi.file.name.clone(), hi.file.start_pos),
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})));
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}
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Ok((lo, hi))
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}
|
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|
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pub fn is_line_before_span_empty(&self, sp: Span) -> bool {
|
|
match self.span_to_prev_source(sp) {
|
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Ok(s) => s.rsplit_once('\n').unwrap_or(("", &s)).1.trim_start().is_empty(),
|
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Err(_) => false,
|
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}
|
|
}
|
|
|
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pub fn span_to_lines(&self, sp: Span) -> FileLinesResult {
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debug!("span_to_lines(sp={:?})", sp);
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let (lo, hi) = self.is_valid_span(sp)?;
|
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assert!(hi.line >= lo.line);
|
|
|
|
if sp.is_dummy() {
|
|
return Ok(FileLines { file: lo.file, lines: Vec::new() });
|
|
}
|
|
|
|
let mut lines = Vec::with_capacity(hi.line - lo.line + 1);
|
|
|
|
// The span starts partway through the first line,
|
|
// but after that it starts from offset 0.
|
|
let mut start_col = lo.col;
|
|
|
|
// For every line but the last, it extends from `start_col`
|
|
// and to the end of the line. Be careful because the line
|
|
// numbers in Loc are 1-based, so we subtract 1 to get 0-based
|
|
// lines.
|
|
//
|
|
// FIXME: now that we handle DUMMY_SP up above, we should consider
|
|
// asserting that the line numbers here are all indeed 1-based.
|
|
let hi_line = hi.line.saturating_sub(1);
|
|
for line_index in lo.line.saturating_sub(1)..hi_line {
|
|
let line_len = lo.file.get_line(line_index).map_or(0, |s| s.chars().count());
|
|
lines.push(LineInfo { line_index, start_col, end_col: CharPos::from_usize(line_len) });
|
|
start_col = CharPos::from_usize(0);
|
|
}
|
|
|
|
// For the last line, it extends from `start_col` to `hi.col`:
|
|
lines.push(LineInfo { line_index: hi_line, start_col, end_col: hi.col });
|
|
|
|
Ok(FileLines { file: lo.file, lines })
|
|
}
|
|
|
|
/// Extracts the source surrounding the given `Span` using the `extract_source` function. The
|
|
/// extract function takes three arguments: a string slice containing the source, an index in
|
|
/// the slice for the beginning of the span and an index in the slice for the end of the span.
|
|
fn span_to_source<F, T>(&self, sp: Span, extract_source: F) -> Result<T, SpanSnippetError>
|
|
where
|
|
F: Fn(&str, usize, usize) -> Result<T, SpanSnippetError>,
|
|
{
|
|
let local_begin = self.lookup_byte_offset(sp.lo());
|
|
let local_end = self.lookup_byte_offset(sp.hi());
|
|
|
|
if local_begin.sf.start_pos != local_end.sf.start_pos {
|
|
Err(SpanSnippetError::DistinctSources(Box::new(DistinctSources {
|
|
begin: (local_begin.sf.name.clone(), local_begin.sf.start_pos),
|
|
end: (local_end.sf.name.clone(), local_end.sf.start_pos),
|
|
})))
|
|
} else {
|
|
self.ensure_source_file_source_present(&local_begin.sf);
|
|
|
|
let start_index = local_begin.pos.to_usize();
|
|
let end_index = local_end.pos.to_usize();
|
|
let source_len = local_begin.sf.source_len.to_usize();
|
|
|
|
if start_index > end_index || end_index > source_len {
|
|
return Err(SpanSnippetError::MalformedForSourcemap(MalformedSourceMapPositions {
|
|
name: local_begin.sf.name.clone(),
|
|
source_len,
|
|
begin_pos: local_begin.pos,
|
|
end_pos: local_end.pos,
|
|
}));
|
|
}
|
|
|
|
if let Some(ref src) = local_begin.sf.src {
|
|
extract_source(src, start_index, end_index)
|
|
} else if let Some(src) = local_begin.sf.external_src.read().get_source() {
|
|
extract_source(src, start_index, end_index)
|
|
} else {
|
|
Err(SpanSnippetError::SourceNotAvailable { filename: local_begin.sf.name.clone() })
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn is_span_accessible(&self, sp: Span) -> bool {
|
|
self.span_to_source(sp, |src, start_index, end_index| {
|
|
Ok(src.get(start_index..end_index).is_some())
|
|
})
|
|
.is_ok_and(|is_accessible| is_accessible)
|
|
}
|
|
|
|
/// Returns the source snippet as `String` corresponding to the given `Span`.
|
|
pub fn span_to_snippet(&self, sp: Span) -> Result<String, SpanSnippetError> {
|
|
self.span_to_source(sp, |src, start_index, end_index| {
|
|
src.get(start_index..end_index)
|
|
.map(|s| s.to_string())
|
|
.ok_or(SpanSnippetError::IllFormedSpan(sp))
|
|
})
|
|
}
|
|
|
|
pub fn span_to_margin(&self, sp: Span) -> Option<usize> {
|
|
Some(self.indentation_before(sp)?.len())
|
|
}
|
|
|
|
pub fn indentation_before(&self, sp: Span) -> Option<String> {
|
|
self.span_to_source(sp, |src, start_index, _| {
|
|
let before = &src[..start_index];
|
|
let last_line = before.rsplit_once('\n').map_or(before, |(_, last)| last);
|
|
Ok(last_line
|
|
.split_once(|c: char| !c.is_whitespace())
|
|
.map_or(last_line, |(indent, _)| indent)
|
|
.to_string())
|
|
})
|
|
.ok()
|
|
}
|
|
|
|
/// Returns the source snippet as `String` before the given `Span`.
|
|
pub fn span_to_prev_source(&self, sp: Span) -> Result<String, SpanSnippetError> {
|
|
self.span_to_source(sp, |src, start_index, _| {
|
|
src.get(..start_index).map(|s| s.to_string()).ok_or(SpanSnippetError::IllFormedSpan(sp))
|
|
})
|
|
}
|
|
|
|
/// Extends the given `Span` to just after the previous occurrence of `c`. Return the same span
|
|
/// if no character could be found or if an error occurred while retrieving the code snippet.
|
|
pub fn span_extend_to_prev_char(&self, sp: Span, c: char, accept_newlines: bool) -> Span {
|
|
if let Ok(prev_source) = self.span_to_prev_source(sp) {
|
|
let prev_source = prev_source.rsplit(c).next().unwrap_or("");
|
|
if !prev_source.is_empty() && (accept_newlines || !prev_source.contains('\n')) {
|
|
return sp.with_lo(BytePos(sp.lo().0 - prev_source.len() as u32));
|
|
}
|
|
}
|
|
|
|
sp
|
|
}
|
|
|
|
/// Extends the given `Span` to just after the previous occurrence of `pat` when surrounded by
|
|
/// whitespace. Returns None if the pattern could not be found or if an error occurred while
|
|
/// retrieving the code snippet.
|
|
pub fn span_extend_to_prev_str(
|
|
&self,
|
|
sp: Span,
|
|
pat: &str,
|
|
accept_newlines: bool,
|
|
include_whitespace: bool,
|
|
) -> Option<Span> {
|
|
// assure that the pattern is delimited, to avoid the following
|
|
// fn my_fn()
|
|
// ^^^^ returned span without the check
|
|
// ---------- correct span
|
|
let prev_source = self.span_to_prev_source(sp).ok()?;
|
|
for ws in &[" ", "\t", "\n"] {
|
|
let pat = pat.to_owned() + ws;
|
|
if let Some(pat_pos) = prev_source.rfind(&pat) {
|
|
let just_after_pat_pos = pat_pos + pat.len() - 1;
|
|
let just_after_pat_plus_ws = if include_whitespace {
|
|
just_after_pat_pos
|
|
+ prev_source[just_after_pat_pos..]
|
|
.find(|c: char| !c.is_whitespace())
|
|
.unwrap_or(0)
|
|
} else {
|
|
just_after_pat_pos
|
|
};
|
|
let len = prev_source.len() - just_after_pat_plus_ws;
|
|
let prev_source = &prev_source[just_after_pat_plus_ws..];
|
|
if accept_newlines || !prev_source.trim_start().contains('\n') {
|
|
return Some(sp.with_lo(BytePos(sp.lo().0 - len as u32)));
|
|
}
|
|
}
|
|
}
|
|
|
|
None
|
|
}
|
|
|
|
/// Returns the source snippet as `String` after the given `Span`.
|
|
pub fn span_to_next_source(&self, sp: Span) -> Result<String, SpanSnippetError> {
|
|
self.span_to_source(sp, |src, _, end_index| {
|
|
src.get(end_index..).map(|s| s.to_string()).ok_or(SpanSnippetError::IllFormedSpan(sp))
|
|
})
|
|
}
|
|
|
|
/// Extends the given `Span` while the next character matches the predicate
|
|
pub fn span_extend_while(
|
|
&self,
|
|
span: Span,
|
|
f: impl Fn(char) -> bool,
|
|
) -> Result<Span, SpanSnippetError> {
|
|
self.span_to_source(span, |s, _start, end| {
|
|
let n = s[end..].char_indices().find(|&(_, c)| !f(c)).map_or(s.len() - end, |(i, _)| i);
|
|
Ok(span.with_hi(span.hi() + BytePos(n as u32)))
|
|
})
|
|
}
|
|
|
|
/// Extends the given `Span` to previous character while the previous character matches the predicate
|
|
pub fn span_extend_prev_while(
|
|
&self,
|
|
span: Span,
|
|
f: impl Fn(char) -> bool,
|
|
) -> Result<Span, SpanSnippetError> {
|
|
self.span_to_source(span, |s, start, _end| {
|
|
let n = s[..start]
|
|
.char_indices()
|
|
.rfind(|&(_, c)| !f(c))
|
|
.map_or(start, |(i, _)| start - i - 1);
|
|
Ok(span.with_lo(span.lo() - BytePos(n as u32)))
|
|
})
|
|
}
|
|
|
|
/// Extends the given `Span` to just before the next occurrence of `c`.
|
|
pub fn span_extend_to_next_char(&self, sp: Span, c: char, accept_newlines: bool) -> Span {
|
|
if let Ok(next_source) = self.span_to_next_source(sp) {
|
|
let next_source = next_source.split(c).next().unwrap_or("");
|
|
if !next_source.is_empty() && (accept_newlines || !next_source.contains('\n')) {
|
|
return sp.with_hi(BytePos(sp.hi().0 + next_source.len() as u32));
|
|
}
|
|
}
|
|
|
|
sp
|
|
}
|
|
|
|
/// Extends the given `Span` to contain the entire line it is on.
|
|
pub fn span_extend_to_line(&self, sp: Span) -> Span {
|
|
self.span_extend_to_prev_char(self.span_extend_to_next_char(sp, '\n', true), '\n', true)
|
|
}
|
|
|
|
/// Given a `Span`, tries to get a shorter span ending before the first occurrence of `char`
|
|
/// `c`.
|
|
pub fn span_until_char(&self, sp: Span, c: char) -> Span {
|
|
match self.span_to_snippet(sp) {
|
|
Ok(snippet) => {
|
|
let snippet = snippet.split(c).next().unwrap_or("").trim_end();
|
|
if !snippet.is_empty() && !snippet.contains('\n') {
|
|
sp.with_hi(BytePos(sp.lo().0 + snippet.len() as u32))
|
|
} else {
|
|
sp
|
|
}
|
|
}
|
|
_ => sp,
|
|
}
|
|
}
|
|
|
|
/// Given a 'Span', tries to tell if it's wrapped by "<>" or "()"
|
|
/// the algorithm searches if the next character is '>' or ')' after skipping white space
|
|
/// then searches the previous character to match '<' or '(' after skipping white space
|
|
/// return true if wrapped by '<>' or '()'
|
|
pub fn span_wrapped_by_angle_or_parentheses(&self, span: Span) -> bool {
|
|
self.span_to_source(span, |src, start_index, end_index| {
|
|
if src.get(start_index..end_index).is_none() {
|
|
return Ok(false);
|
|
}
|
|
// test the right side to match '>' after skipping white space
|
|
let end_src = &src[end_index..];
|
|
let mut i = 0;
|
|
let mut found_right_parentheses = false;
|
|
let mut found_right_angle = false;
|
|
while let Some(cc) = end_src.chars().nth(i) {
|
|
if cc == ' ' {
|
|
i = i + 1;
|
|
} else if cc == '>' {
|
|
// found > in the right;
|
|
found_right_angle = true;
|
|
break;
|
|
} else if cc == ')' {
|
|
found_right_parentheses = true;
|
|
break;
|
|
} else {
|
|
// failed to find '>' return false immediately
|
|
return Ok(false);
|
|
}
|
|
}
|
|
// test the left side to match '<' after skipping white space
|
|
i = start_index;
|
|
let start_src = &src[0..start_index];
|
|
while let Some(cc) = start_src.chars().nth(i) {
|
|
if cc == ' ' {
|
|
if i == 0 {
|
|
return Ok(false);
|
|
}
|
|
i = i - 1;
|
|
} else if cc == '<' {
|
|
// found < in the left
|
|
if !found_right_angle {
|
|
// skip something like "(< )>"
|
|
return Ok(false);
|
|
}
|
|
break;
|
|
} else if cc == '(' {
|
|
if !found_right_parentheses {
|
|
// skip something like "<(>)"
|
|
return Ok(false);
|
|
}
|
|
break;
|
|
} else {
|
|
// failed to find '<' return false immediately
|
|
return Ok(false);
|
|
}
|
|
}
|
|
return Ok(true);
|
|
})
|
|
.is_ok_and(|is_accessible| is_accessible)
|
|
}
|
|
|
|
/// Given a `Span`, tries to get a shorter span ending just after the first occurrence of `char`
|
|
/// `c`.
|
|
pub fn span_through_char(&self, sp: Span, c: char) -> Span {
|
|
if let Ok(snippet) = self.span_to_snippet(sp) {
|
|
if let Some(offset) = snippet.find(c) {
|
|
return sp.with_hi(BytePos(sp.lo().0 + (offset + c.len_utf8()) as u32));
|
|
}
|
|
}
|
|
sp
|
|
}
|
|
|
|
/// Given a `Span`, gets a new `Span` covering the first token and all its trailing whitespace
|
|
/// or the original `Span`.
|
|
///
|
|
/// If `sp` points to `"let mut x"`, then a span pointing at `"let "` will be returned.
|
|
pub fn span_until_non_whitespace(&self, sp: Span) -> Span {
|
|
let mut whitespace_found = false;
|
|
|
|
self.span_take_while(sp, |c| {
|
|
if !whitespace_found && c.is_whitespace() {
|
|
whitespace_found = true;
|
|
}
|
|
|
|
!whitespace_found || c.is_whitespace()
|
|
})
|
|
}
|
|
|
|
/// Given a `Span`, gets a new `Span` covering the first token without its trailing whitespace
|
|
/// or the original `Span` in case of error.
|
|
///
|
|
/// If `sp` points to `"let mut x"`, then a span pointing at `"let"` will be returned.
|
|
pub fn span_until_whitespace(&self, sp: Span) -> Span {
|
|
self.span_take_while(sp, |c| !c.is_whitespace())
|
|
}
|
|
|
|
/// Given a `Span`, gets a shorter one until `predicate` yields `false`.
|
|
pub fn span_take_while<P>(&self, sp: Span, predicate: P) -> Span
|
|
where
|
|
P: for<'r> FnMut(&'r char) -> bool,
|
|
{
|
|
if let Ok(snippet) = self.span_to_snippet(sp) {
|
|
let offset = snippet.chars().take_while(predicate).map(|c| c.len_utf8()).sum::<usize>();
|
|
|
|
sp.with_hi(BytePos(sp.lo().0 + (offset as u32)))
|
|
} else {
|
|
sp
|
|
}
|
|
}
|
|
|
|
/// Given a `Span`, return a span ending in the closest `{`. This is useful when you have a
|
|
/// `Span` enclosing a whole item but we need to point at only the head (usually the first
|
|
/// line) of that item.
|
|
///
|
|
/// *Only suitable for diagnostics.*
|
|
pub fn guess_head_span(&self, sp: Span) -> Span {
|
|
// FIXME: extend the AST items to have a head span, or replace callers with pointing at
|
|
// the item's ident when appropriate.
|
|
self.span_until_char(sp, '{')
|
|
}
|
|
|
|
/// Returns a new span representing just the first character of the given span.
|
|
pub fn start_point(&self, sp: Span) -> Span {
|
|
let width = {
|
|
let sp = sp.data();
|
|
let local_begin = self.lookup_byte_offset(sp.lo);
|
|
let start_index = local_begin.pos.to_usize();
|
|
let src = local_begin.sf.external_src.read();
|
|
|
|
let snippet = if let Some(ref src) = local_begin.sf.src {
|
|
Some(&src[start_index..])
|
|
} else {
|
|
src.get_source().map(|src| &src[start_index..])
|
|
};
|
|
|
|
match snippet {
|
|
None => 1,
|
|
Some(snippet) => match snippet.chars().next() {
|
|
None => 1,
|
|
Some(c) => c.len_utf8(),
|
|
},
|
|
}
|
|
};
|
|
|
|
sp.with_hi(BytePos(sp.lo().0 + width as u32))
|
|
}
|
|
|
|
/// Returns a new span representing just the last character of this span.
|
|
pub fn end_point(&self, sp: Span) -> Span {
|
|
let pos = sp.hi().0;
|
|
|
|
let width = self.find_width_of_character_at_span(sp, false);
|
|
let corrected_end_position = pos.checked_sub(width).unwrap_or(pos);
|
|
|
|
let end_point = BytePos(cmp::max(corrected_end_position, sp.lo().0));
|
|
sp.with_lo(end_point)
|
|
}
|
|
|
|
/// Returns a new span representing the next character after the end-point of this span.
|
|
/// Special cases:
|
|
/// - if span is a dummy one, returns the same span
|
|
/// - if next_point reached the end of source, return a span exceeding the end of source,
|
|
/// which means sm.span_to_snippet(next_point) will get `Err`
|
|
/// - respect multi-byte characters
|
|
pub fn next_point(&self, sp: Span) -> Span {
|
|
if sp.is_dummy() {
|
|
return sp;
|
|
}
|
|
let start_of_next_point = sp.hi().0;
|
|
|
|
let width = self.find_width_of_character_at_span(sp, true);
|
|
// If the width is 1, then the next span should only contain the next char besides current ending.
|
|
// However, in the case of a multibyte character, where the width != 1, the next span should
|
|
// span multiple bytes to include the whole character.
|
|
let end_of_next_point =
|
|
start_of_next_point.checked_add(width).unwrap_or(start_of_next_point);
|
|
|
|
let end_of_next_point = BytePos(cmp::max(start_of_next_point + 1, end_of_next_point));
|
|
Span::new(BytePos(start_of_next_point), end_of_next_point, sp.ctxt(), None)
|
|
}
|
|
|
|
/// Check whether span is followed by some specified expected string in limit scope
|
|
pub fn span_look_ahead(&self, span: Span, expect: &str, limit: Option<usize>) -> Option<Span> {
|
|
let mut sp = span;
|
|
for _ in 0..limit.unwrap_or(100_usize) {
|
|
sp = self.next_point(sp);
|
|
if let Ok(ref snippet) = self.span_to_snippet(sp) {
|
|
if snippet == expect {
|
|
return Some(sp);
|
|
}
|
|
if snippet.chars().any(|c| !c.is_whitespace()) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
/// Finds the width of the character, either before or after the end of provided span,
|
|
/// depending on the `forwards` parameter.
|
|
#[instrument(skip(self, sp))]
|
|
fn find_width_of_character_at_span(&self, sp: Span, forwards: bool) -> u32 {
|
|
let sp = sp.data();
|
|
|
|
if sp.lo == sp.hi && !forwards {
|
|
debug!("early return empty span");
|
|
return 1;
|
|
}
|
|
|
|
let local_begin = self.lookup_byte_offset(sp.lo);
|
|
let local_end = self.lookup_byte_offset(sp.hi);
|
|
debug!("local_begin=`{:?}`, local_end=`{:?}`", local_begin, local_end);
|
|
|
|
if local_begin.sf.start_pos != local_end.sf.start_pos {
|
|
debug!("begin and end are in different files");
|
|
return 1;
|
|
}
|
|
|
|
let start_index = local_begin.pos.to_usize();
|
|
let end_index = local_end.pos.to_usize();
|
|
debug!("start_index=`{:?}`, end_index=`{:?}`", start_index, end_index);
|
|
|
|
// Disregard indexes that are at the start or end of their spans, they can't fit bigger
|
|
// characters.
|
|
if (!forwards && end_index == usize::MIN) || (forwards && start_index == usize::MAX) {
|
|
debug!("start or end of span, cannot be multibyte");
|
|
return 1;
|
|
}
|
|
|
|
let source_len = local_begin.sf.source_len.to_usize();
|
|
debug!("source_len=`{:?}`", source_len);
|
|
// Ensure indexes are also not malformed.
|
|
if start_index > end_index || end_index > source_len - 1 {
|
|
debug!("source indexes are malformed");
|
|
return 1;
|
|
}
|
|
|
|
let src = local_begin.sf.external_src.read();
|
|
|
|
let snippet = if let Some(src) = &local_begin.sf.src {
|
|
src
|
|
} else if let Some(src) = src.get_source() {
|
|
src
|
|
} else {
|
|
return 1;
|
|
};
|
|
|
|
if forwards {
|
|
(snippet.ceil_char_boundary(end_index + 1) - end_index) as u32
|
|
} else {
|
|
(end_index - snippet.floor_char_boundary(end_index - 1)) as u32
|
|
}
|
|
}
|
|
|
|
pub fn get_source_file(&self, filename: &FileName) -> Option<Lrc<SourceFile>> {
|
|
// Remap filename before lookup
|
|
let filename = self.path_mapping().map_filename_prefix(filename).0;
|
|
for sf in self.files.borrow().source_files.iter() {
|
|
if filename == sf.name {
|
|
return Some(sf.clone());
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
/// For a global `BytePos`, computes the local offset within the containing `SourceFile`.
|
|
pub fn lookup_byte_offset(&self, bpos: BytePos) -> SourceFileAndBytePos {
|
|
let idx = self.lookup_source_file_idx(bpos);
|
|
let sf = (*self.files.borrow().source_files)[idx].clone();
|
|
let offset = bpos - sf.start_pos;
|
|
SourceFileAndBytePos { sf, pos: offset }
|
|
}
|
|
|
|
/// Returns the index of the [`SourceFile`] (in `self.files`) that contains `pos`.
|
|
/// This index is guaranteed to be valid for the lifetime of this `SourceMap`,
|
|
/// since `source_files` is a `MonotonicVec`
|
|
pub fn lookup_source_file_idx(&self, pos: BytePos) -> usize {
|
|
self.files.borrow().source_files.partition_point(|x| x.start_pos <= pos) - 1
|
|
}
|
|
|
|
pub fn count_lines(&self) -> usize {
|
|
self.files().iter().fold(0, |a, f| a + f.count_lines())
|
|
}
|
|
|
|
pub fn ensure_source_file_source_present(&self, source_file: &SourceFile) -> bool {
|
|
source_file.add_external_src(|| {
|
|
let FileName::Real(ref name) = source_file.name else {
|
|
return None;
|
|
};
|
|
|
|
let local_path: Cow<'_, Path> = match name {
|
|
RealFileName::LocalPath(local_path) => local_path.into(),
|
|
RealFileName::Remapped { local_path: Some(local_path), .. } => local_path.into(),
|
|
RealFileName::Remapped { local_path: None, virtual_name } => {
|
|
// The compiler produces better error messages if the sources of dependencies
|
|
// are available. Attempt to undo any path mapping so we can find remapped
|
|
// dependencies.
|
|
// We can only use the heuristic because `add_external_src` checks the file
|
|
// content hash.
|
|
self.path_mapping.reverse_map_prefix_heuristically(virtual_name)?.into()
|
|
}
|
|
};
|
|
|
|
self.file_loader.read_file(&local_path).ok()
|
|
})
|
|
}
|
|
|
|
pub fn is_imported(&self, sp: Span) -> bool {
|
|
let source_file_index = self.lookup_source_file_idx(sp.lo());
|
|
let source_file = &self.files()[source_file_index];
|
|
source_file.is_imported()
|
|
}
|
|
|
|
/// Gets the span of a statement. If the statement is a macro expansion, the
|
|
/// span in the context of the block span is found. The trailing semicolon is included
|
|
/// on a best-effort basis.
|
|
pub fn stmt_span(&self, stmt_span: Span, block_span: Span) -> Span {
|
|
if !stmt_span.from_expansion() {
|
|
return stmt_span;
|
|
}
|
|
let mac_call = original_sp(stmt_span, block_span);
|
|
self.mac_call_stmt_semi_span(mac_call).map_or(mac_call, |s| mac_call.with_hi(s.hi()))
|
|
}
|
|
|
|
/// Tries to find the span of the semicolon of a macro call statement.
|
|
/// The input must be the *call site* span of a statement from macro expansion.
|
|
/// ```ignore (illustrative)
|
|
/// // v output
|
|
/// mac!();
|
|
/// // ^^^^^^ input
|
|
/// ```
|
|
pub fn mac_call_stmt_semi_span(&self, mac_call: Span) -> Option<Span> {
|
|
let span = self.span_extend_while(mac_call, char::is_whitespace).ok()?;
|
|
let span = span.shrink_to_hi().with_hi(BytePos(span.hi().0.checked_add(1)?));
|
|
if self.span_to_snippet(span).as_deref() != Ok(";") {
|
|
return None;
|
|
}
|
|
Some(span)
|
|
}
|
|
}
|
|
|
|
#[derive(Clone)]
|
|
pub struct FilePathMapping {
|
|
mapping: Vec<(PathBuf, PathBuf)>,
|
|
filename_display_for_diagnostics: FileNameDisplayPreference,
|
|
}
|
|
|
|
impl FilePathMapping {
|
|
pub fn empty() -> FilePathMapping {
|
|
FilePathMapping::new(Vec::new(), FileNameDisplayPreference::Local)
|
|
}
|
|
|
|
pub fn new(
|
|
mapping: Vec<(PathBuf, PathBuf)>,
|
|
filename_display_for_diagnostics: FileNameDisplayPreference,
|
|
) -> FilePathMapping {
|
|
FilePathMapping { mapping, filename_display_for_diagnostics }
|
|
}
|
|
|
|
/// Applies any path prefix substitution as defined by the mapping.
|
|
/// The return value is the remapped path and a boolean indicating whether
|
|
/// the path was affected by the mapping.
|
|
pub fn map_prefix<'a>(&'a self, path: impl Into<Cow<'a, Path>>) -> (Cow<'a, Path>, bool) {
|
|
let path = path.into();
|
|
if path.as_os_str().is_empty() {
|
|
// Exit early if the path is empty and therefore there's nothing to remap.
|
|
// This is mostly to reduce spam for `RUSTC_LOG=[remap_path_prefix]`.
|
|
return (path, false);
|
|
}
|
|
|
|
return remap_path_prefix(&self.mapping, path);
|
|
|
|
#[instrument(level = "debug", skip(mapping), ret)]
|
|
fn remap_path_prefix<'a>(
|
|
mapping: &'a [(PathBuf, PathBuf)],
|
|
path: Cow<'a, Path>,
|
|
) -> (Cow<'a, Path>, bool) {
|
|
// NOTE: We are iterating over the mapping entries from last to first
|
|
// because entries specified later on the command line should
|
|
// take precedence.
|
|
for (from, to) in mapping.iter().rev() {
|
|
debug!("Trying to apply {from:?} => {to:?}");
|
|
|
|
if let Ok(rest) = path.strip_prefix(from) {
|
|
let remapped = if rest.as_os_str().is_empty() {
|
|
// This is subtle, joining an empty path onto e.g. `foo/bar` will
|
|
// result in `foo/bar/`, that is, there'll be an additional directory
|
|
// separator at the end. This can lead to duplicated directory separators
|
|
// in remapped paths down the line.
|
|
// So, if we have an exact match, we just return that without a call
|
|
// to `Path::join()`.
|
|
to.into()
|
|
} else {
|
|
to.join(rest).into()
|
|
};
|
|
debug!("Match - remapped");
|
|
|
|
return (remapped, true);
|
|
} else {
|
|
debug!("No match - prefix {from:?} does not match");
|
|
}
|
|
}
|
|
|
|
debug!("not remapped");
|
|
(path, false)
|
|
}
|
|
}
|
|
|
|
fn map_filename_prefix(&self, file: &FileName) -> (FileName, bool) {
|
|
match file {
|
|
FileName::Real(realfile) if let RealFileName::LocalPath(local_path) = realfile => {
|
|
let (mapped_path, mapped) = self.map_prefix(local_path);
|
|
let realfile = if mapped {
|
|
RealFileName::Remapped {
|
|
local_path: Some(local_path.clone()),
|
|
virtual_name: mapped_path.into_owned(),
|
|
}
|
|
} else {
|
|
realfile.clone()
|
|
};
|
|
(FileName::Real(realfile), mapped)
|
|
}
|
|
FileName::Real(_) => unreachable!("attempted to remap an already remapped filename"),
|
|
other => (other.clone(), false),
|
|
}
|
|
}
|
|
|
|
/// Applies any path prefix substitution as defined by the mapping.
|
|
/// The return value is the local path with a "virtual path" representing the remapped
|
|
/// part if any remapping was performed.
|
|
pub fn to_real_filename<'a>(&self, local_path: impl Into<Cow<'a, Path>>) -> RealFileName {
|
|
let local_path = local_path.into();
|
|
if let (remapped_path, true) = self.map_prefix(&*local_path) {
|
|
RealFileName::Remapped {
|
|
virtual_name: remapped_path.into_owned(),
|
|
local_path: Some(local_path.into_owned()),
|
|
}
|
|
} else {
|
|
RealFileName::LocalPath(local_path.into_owned())
|
|
}
|
|
}
|
|
|
|
/// Expand a relative path to an absolute path with remapping taken into account.
|
|
/// Use this when absolute paths are required (e.g. debuginfo or crate metadata).
|
|
///
|
|
/// The resulting `RealFileName` will have its `local_path` portion erased if
|
|
/// possible (i.e. if there's also a remapped path).
|
|
pub fn to_embeddable_absolute_path(
|
|
&self,
|
|
file_path: RealFileName,
|
|
working_directory: &RealFileName,
|
|
) -> RealFileName {
|
|
match file_path {
|
|
// Anything that's already remapped we don't modify, except for erasing
|
|
// the `local_path` portion.
|
|
RealFileName::Remapped { local_path: _, virtual_name } => {
|
|
RealFileName::Remapped {
|
|
// We do not want any local path to be exported into metadata
|
|
local_path: None,
|
|
// We use the remapped name verbatim, even if it looks like a relative
|
|
// path. The assumption is that the user doesn't want us to further
|
|
// process paths that have gone through remapping.
|
|
virtual_name,
|
|
}
|
|
}
|
|
|
|
RealFileName::LocalPath(unmapped_file_path) => {
|
|
// If no remapping has been applied yet, try to do so
|
|
let (new_path, was_remapped) = self.map_prefix(unmapped_file_path);
|
|
if was_remapped {
|
|
// It was remapped, so don't modify further
|
|
return RealFileName::Remapped {
|
|
local_path: None,
|
|
virtual_name: new_path.into_owned(),
|
|
};
|
|
}
|
|
|
|
if new_path.is_absolute() {
|
|
// No remapping has applied to this path and it is absolute,
|
|
// so the working directory cannot influence it either, so
|
|
// we are done.
|
|
return RealFileName::LocalPath(new_path.into_owned());
|
|
}
|
|
|
|
debug_assert!(new_path.is_relative());
|
|
let unmapped_file_path_rel = new_path;
|
|
|
|
match working_directory {
|
|
RealFileName::LocalPath(unmapped_working_dir_abs) => {
|
|
let file_path_abs = unmapped_working_dir_abs.join(unmapped_file_path_rel);
|
|
|
|
// Although neither `working_directory` nor the file name were subject
|
|
// to path remapping, the concatenation between the two may be. Hence
|
|
// we need to do a remapping here.
|
|
let (file_path_abs, was_remapped) = self.map_prefix(file_path_abs);
|
|
if was_remapped {
|
|
RealFileName::Remapped {
|
|
// Erase the actual path
|
|
local_path: None,
|
|
virtual_name: file_path_abs.into_owned(),
|
|
}
|
|
} else {
|
|
// No kind of remapping applied to this path, so
|
|
// we leave it as it is.
|
|
RealFileName::LocalPath(file_path_abs.into_owned())
|
|
}
|
|
}
|
|
RealFileName::Remapped {
|
|
local_path: _,
|
|
virtual_name: remapped_working_dir_abs,
|
|
} => {
|
|
// If working_directory has been remapped, then we emit
|
|
// Remapped variant as the expanded path won't be valid
|
|
RealFileName::Remapped {
|
|
local_path: None,
|
|
virtual_name: Path::new(remapped_working_dir_abs)
|
|
.join(unmapped_file_path_rel),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Expand a relative path to an absolute path **without** remapping taken into account.
|
|
///
|
|
/// The resulting `RealFileName` will have its `virtual_path` portion erased if
|
|
/// possible (i.e. if there's also a remapped path).
|
|
pub fn to_local_embeddable_absolute_path(
|
|
&self,
|
|
file_path: RealFileName,
|
|
working_directory: &RealFileName,
|
|
) -> RealFileName {
|
|
let file_path = file_path.local_path_if_available();
|
|
if file_path.is_absolute() {
|
|
// No remapping has applied to this path and it is absolute,
|
|
// so the working directory cannot influence it either, so
|
|
// we are done.
|
|
return RealFileName::LocalPath(file_path.to_path_buf());
|
|
}
|
|
debug_assert!(file_path.is_relative());
|
|
let working_directory = working_directory.local_path_if_available();
|
|
RealFileName::LocalPath(Path::new(working_directory).join(file_path))
|
|
}
|
|
|
|
/// Attempts to (heuristically) reverse a prefix mapping.
|
|
///
|
|
/// Returns [`Some`] if there is exactly one mapping where the "to" part is
|
|
/// a prefix of `path` and has at least one non-empty
|
|
/// [`Normal`](path::Component::Normal) component. The component
|
|
/// restriction exists to avoid reverse mapping overly generic paths like
|
|
/// `/` or `.`).
|
|
///
|
|
/// This is a heuristic and not guaranteed to return the actual original
|
|
/// path! Do not rely on the result unless you have other means to verify
|
|
/// that the mapping is correct (e.g. by checking the file content hash).
|
|
#[instrument(level = "debug", skip(self), ret)]
|
|
fn reverse_map_prefix_heuristically(&self, path: &Path) -> Option<PathBuf> {
|
|
let mut found = None;
|
|
|
|
for (from, to) in self.mapping.iter() {
|
|
let has_normal_component = to.components().any(|c| match c {
|
|
path::Component::Normal(s) => !s.is_empty(),
|
|
_ => false,
|
|
});
|
|
|
|
if !has_normal_component {
|
|
continue;
|
|
}
|
|
|
|
let Ok(rest) = path.strip_prefix(to) else {
|
|
continue;
|
|
};
|
|
|
|
if found.is_some() {
|
|
return None;
|
|
}
|
|
|
|
found = Some(from.join(rest));
|
|
}
|
|
|
|
found
|
|
}
|
|
}
|