f7dc917ba4
Emits loc, and node count - before and after expansion. E.g., ``` rustc: x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore Lines of code: 32060 Pre-expansion node count: 120205 Post-expansion node count: 482749 ```
1278 lines
44 KiB
Rust
1278 lines
44 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! The CodeMap 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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//! CodeMap and are represented by FileMaps. Byte positions are stored in
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//! `spans` and used pervasively in the compiler. They are absolute positions
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//! within the CodeMap, which upon request can be converted to line and column
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//! information, source code snippets, etc.
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pub use self::ExpnFormat::*;
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use std::cell::{Cell, RefCell};
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use std::ops::{Add, Sub};
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use std::path::Path;
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use std::rc::Rc;
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use std::{fmt, fs};
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use std::io::{self, Read};
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use serialize::{Encodable, Decodable, Encoder, Decoder};
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use ast::Name;
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// _____________________________________________________________________________
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// Pos, BytePos, CharPos
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//
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pub trait Pos {
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fn from_usize(n: usize) -> Self;
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fn to_usize(&self) -> usize;
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}
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/// A byte offset. Keep this small (currently 32-bits), as AST contains
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/// a lot of them.
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#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Debug)]
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pub struct BytePos(pub u32);
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/// A character offset. Because of multibyte utf8 characters, a byte offset
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/// is not equivalent to a character offset. The CodeMap will convert BytePos
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/// values to CharPos values as necessary.
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#[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Debug)]
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pub struct CharPos(pub usize);
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// FIXME: Lots of boilerplate in these impls, but so far my attempts to fix
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// have been unsuccessful
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impl Pos for BytePos {
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fn from_usize(n: usize) -> BytePos { BytePos(n as u32) }
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fn to_usize(&self) -> usize { let BytePos(n) = *self; n as usize }
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}
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impl Add for BytePos {
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type Output = BytePos;
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fn add(self, rhs: BytePos) -> BytePos {
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BytePos((self.to_usize() + rhs.to_usize()) as u32)
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}
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}
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impl Sub for BytePos {
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type Output = BytePos;
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fn sub(self, rhs: BytePos) -> BytePos {
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BytePos((self.to_usize() - rhs.to_usize()) as u32)
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}
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}
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impl Encodable for BytePos {
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fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
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s.emit_u32(self.0)
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}
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}
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impl Decodable for BytePos {
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fn decode<D: Decoder>(d: &mut D) -> Result<BytePos, D::Error> {
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Ok(BytePos(try!{ d.read_u32() }))
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}
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}
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impl Pos for CharPos {
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fn from_usize(n: usize) -> CharPos { CharPos(n) }
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fn to_usize(&self) -> usize { let CharPos(n) = *self; n }
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}
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impl Add for CharPos {
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type Output = CharPos;
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fn add(self, rhs: CharPos) -> CharPos {
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CharPos(self.to_usize() + rhs.to_usize())
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}
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}
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impl Sub for CharPos {
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type Output = CharPos;
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fn sub(self, rhs: CharPos) -> CharPos {
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CharPos(self.to_usize() - rhs.to_usize())
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}
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}
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// _____________________________________________________________________________
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// Span, Spanned
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//
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/// Spans represent a region of code, used for error reporting. Positions in spans
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/// are *absolute* positions from the beginning of the codemap, not positions
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/// relative to FileMaps. Methods on the CodeMap can be used to relate spans back
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/// to the original source.
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/// You must be careful if the span crosses more than one file - you will not be
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/// able to use many of the functions on spans in codemap and you cannot assume
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/// that the length of the span = hi - lo; there may be space in the BytePos
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/// range between files.
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#[derive(Clone, Copy, Hash)]
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pub struct Span {
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pub lo: BytePos,
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pub hi: BytePos,
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/// Information about where the macro came from, if this piece of
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/// code was created by a macro expansion.
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pub expn_id: ExpnId
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}
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pub const DUMMY_SP: Span = Span { lo: BytePos(0), hi: BytePos(0), expn_id: NO_EXPANSION };
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// Generic span to be used for code originating from the command line
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pub const COMMAND_LINE_SP: Span = Span { lo: BytePos(0),
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hi: BytePos(0),
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expn_id: COMMAND_LINE_EXPN };
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impl Span {
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/// Returns `self` if `self` is not the dummy span, and `other` otherwise.
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pub fn substitute_dummy(self, other: Span) -> Span {
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if self == DUMMY_SP { other } else { self }
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}
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pub fn contains(self, other: Span) -> bool {
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self.lo <= other.lo && other.hi <= self.hi
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}
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}
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
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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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impl PartialEq for Span {
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fn eq(&self, other: &Span) -> bool {
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return (*self).lo == (*other).lo && (*self).hi == (*other).hi;
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}
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fn ne(&self, other: &Span) -> bool { !(*self).eq(other) }
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}
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impl Eq for Span {}
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impl Encodable for Span {
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fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
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// Encode spans as a single u64 in order to cut down on tagging overhead
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// added by the RBML metadata encoding. The should be solved differently
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// altogether some time (FIXME #21482)
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s.emit_u64( (self.lo.0 as u64) | ((self.hi.0 as u64) << 32) )
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}
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}
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impl Decodable for Span {
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fn decode<D: Decoder>(d: &mut D) -> Result<Span, D::Error> {
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let lo_hi: u64 = try! { d.read_u64() };
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let lo = BytePos(lo_hi as u32);
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let hi = BytePos((lo_hi >> 32) as u32);
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Ok(mk_sp(lo, hi))
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}
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}
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fn default_span_debug(span: Span, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "Span {{ lo: {:?}, hi: {:?}, expn_id: {:?} }}",
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span.lo, span.hi, span.expn_id)
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}
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thread_local!(pub static SPAN_DEBUG: Cell<fn(Span, &mut fmt::Formatter) -> fmt::Result> =
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Cell::new(default_span_debug));
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impl fmt::Debug for Span {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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SPAN_DEBUG.with(|span_debug| span_debug.get()(*self, f))
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}
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}
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pub fn spanned<T>(lo: BytePos, hi: BytePos, t: T) -> Spanned<T> {
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respan(mk_sp(lo, hi), t)
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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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/* assuming that we're not in macro expansion */
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pub fn mk_sp(lo: BytePos, hi: BytePos) -> Span {
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Span {lo: lo, hi: hi, expn_id: NO_EXPANSION}
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}
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/// Return 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_info` chain.
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pub fn original_sp(cm: &CodeMap, sp: Span, enclosing_sp: Span) -> Span {
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let call_site1 = cm.with_expn_info(sp.expn_id, |ei| ei.map(|ei| ei.call_site));
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let call_site2 = cm.with_expn_info(enclosing_sp.expn_id, |ei| ei.map(|ei| ei.call_site));
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match (call_site1, call_site2) {
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(None, _) => sp,
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(Some(call_site1), Some(call_site2)) if call_site1 == call_site2 => sp,
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(Some(call_site1), _) => original_sp(cm, call_site1, enclosing_sp),
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}
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}
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// _____________________________________________________________________________
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// Loc, LocWithOpt, FileMapAndLine, FileMapAndBytePos
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//
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/// A source code location used for error reporting
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#[derive(Debug)]
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pub struct Loc {
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/// Information about the original source
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pub file: Rc<FileMap>,
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/// The (1-based) line number
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pub line: usize,
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/// The (0-based) column offset
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pub col: CharPos
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}
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/// A source code location used as the result of lookup_char_pos_adj
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// Actually, *none* of the clients use the filename *or* file field;
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// perhaps they should just be removed.
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#[derive(Debug)]
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pub struct LocWithOpt {
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pub filename: FileName,
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pub line: usize,
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pub col: CharPos,
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pub file: Option<Rc<FileMap>>,
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}
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// used to be structural records. Better names, anyone?
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#[derive(Debug)]
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pub struct FileMapAndLine { pub fm: Rc<FileMap>, pub line: usize }
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#[derive(Debug)]
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pub struct FileMapAndBytePos { pub fm: Rc<FileMap>, pub pos: BytePos }
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// _____________________________________________________________________________
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// ExpnFormat, NameAndSpan, ExpnInfo, ExpnId
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//
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/// The source of expansion.
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#[derive(Clone, Hash, Debug, PartialEq, Eq)]
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pub enum ExpnFormat {
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/// e.g. #[derive(...)] <item>
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MacroAttribute(Name),
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/// e.g. `format!()`
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MacroBang(Name),
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}
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#[derive(Clone, Hash, Debug)]
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pub struct NameAndSpan {
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/// The format with which the macro was invoked.
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pub format: ExpnFormat,
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/// Whether the macro is allowed to use #[unstable]/feature-gated
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/// features internally without forcing the whole crate to opt-in
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/// to them.
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pub allow_internal_unstable: bool,
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/// The span of the macro definition itself. The macro may not
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/// have a sensible definition span (e.g. something defined
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/// completely inside libsyntax) in which case this is None.
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pub span: Option<Span>
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}
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impl NameAndSpan {
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pub fn name(&self) -> Name {
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match self.format {
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ExpnFormat::MacroAttribute(s) => s,
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ExpnFormat::MacroBang(s) => s,
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}
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}
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}
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/// Extra information for tracking spans of macro and syntax sugar expansion
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#[derive(Hash, Debug)]
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pub struct ExpnInfo {
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/// The location of the actual macro invocation or syntax sugar , e.g.
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/// `let x = foo!();` or `if let Some(y) = x {}`
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///
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/// This may recursively refer to other macro invocations, e.g. if
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/// `foo!()` invoked `bar!()` internally, and there was an
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/// expression inside `bar!`; the call_site of the expression in
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/// the expansion would point to the `bar!` invocation; that
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/// call_site span would have its own ExpnInfo, with the call_site
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/// pointing to the `foo!` invocation.
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pub call_site: Span,
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/// Information about the expansion.
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pub callee: NameAndSpan
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}
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#[derive(PartialEq, Eq, Clone, Debug, Hash, RustcEncodable, RustcDecodable, Copy)]
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pub struct ExpnId(u32);
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pub const NO_EXPANSION: ExpnId = ExpnId(!0);
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// For code appearing from the command line
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pub const COMMAND_LINE_EXPN: ExpnId = ExpnId(!1);
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impl ExpnId {
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pub fn from_u32(id: u32) -> ExpnId {
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ExpnId(id)
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}
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pub fn into_u32(self) -> u32 {
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self.0
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}
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}
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// _____________________________________________________________________________
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// FileMap, MultiByteChar, FileName, FileLines
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//
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pub type FileName = String;
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub struct LineInfo {
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/// Index of line, starting from 0.
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pub line_index: usize,
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/// Column in line where span begins, starting from 0.
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pub start_col: CharPos,
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/// Column in line where span ends, starting from 0, exclusive.
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pub end_col: CharPos,
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}
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pub struct FileLines {
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pub file: Rc<FileMap>,
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pub lines: Vec<LineInfo>
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}
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/// Identifies an offset of a multi-byte character in a FileMap
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#[derive(Copy, Clone, RustcEncodable, RustcDecodable, Eq, PartialEq)]
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pub struct MultiByteChar {
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/// The absolute offset of the character in the CodeMap
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pub pos: BytePos,
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/// The number of bytes, >=2
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pub bytes: usize,
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}
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/// A single source in the CodeMap.
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pub struct FileMap {
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/// The name of the file that the source came from, source that doesn't
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/// originate from files has names between angle brackets by convention,
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/// e.g. `<anon>`
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pub name: FileName,
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/// The complete source code
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pub src: Option<Rc<String>>,
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/// The start position of this source in the CodeMap
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pub start_pos: BytePos,
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/// The end position of this source in the CodeMap
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pub end_pos: BytePos,
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/// Locations of lines beginnings in the source code
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pub lines: RefCell<Vec<BytePos>>,
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/// Locations of multi-byte characters in the source code
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pub multibyte_chars: RefCell<Vec<MultiByteChar>>,
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}
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impl Encodable for FileMap {
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fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
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s.emit_struct("FileMap", 5, |s| {
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try! { s.emit_struct_field("name", 0, |s| self.name.encode(s)) };
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try! { s.emit_struct_field("start_pos", 1, |s| self.start_pos.encode(s)) };
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try! { s.emit_struct_field("end_pos", 2, |s| self.end_pos.encode(s)) };
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try! { s.emit_struct_field("lines", 3, |s| {
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let lines = self.lines.borrow();
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// store the length
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try! { s.emit_u32(lines.len() as u32) };
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if !lines.is_empty() {
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// In order to preserve some space, we exploit the fact that
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// the lines list is sorted and individual lines are
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// probably not that long. Because of that we can store lines
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// as a difference list, using as little space as possible
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// for the differences.
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let max_line_length = if lines.len() == 1 {
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0
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} else {
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lines.windows(2)
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.map(|w| w[1] - w[0])
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.map(|bp| bp.to_usize())
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.max()
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.unwrap()
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};
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let bytes_per_diff: u8 = match max_line_length {
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0 ... 0xFF => 1,
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0x100 ... 0xFFFF => 2,
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_ => 4
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};
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// Encode the number of bytes used per diff.
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try! { bytes_per_diff.encode(s) };
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// Encode the first element.
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try! { lines[0].encode(s) };
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let diff_iter = (&lines[..]).windows(2)
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.map(|w| (w[1] - w[0]));
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match bytes_per_diff {
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1 => for diff in diff_iter { try! { (diff.0 as u8).encode(s) } },
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2 => for diff in diff_iter { try! { (diff.0 as u16).encode(s) } },
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4 => for diff in diff_iter { try! { diff.0.encode(s) } },
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_ => unreachable!()
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}
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}
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Ok(())
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})
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};
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s.emit_struct_field("multibyte_chars", 4, |s| {
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(*self.multibyte_chars.borrow()).encode(s)
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})
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})
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}
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}
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impl Decodable for FileMap {
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fn decode<D: Decoder>(d: &mut D) -> Result<FileMap, D::Error> {
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d.read_struct("FileMap", 5, |d| {
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let name: String = try! {
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d.read_struct_field("name", 0, |d| Decodable::decode(d))
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};
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let start_pos: BytePos = try! {
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d.read_struct_field("start_pos", 1, |d| Decodable::decode(d))
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};
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let end_pos: BytePos = try! {
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d.read_struct_field("end_pos", 2, |d| Decodable::decode(d))
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};
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let lines: Vec<BytePos> = try! {
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d.read_struct_field("lines", 3, |d| {
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let num_lines: u32 = try! { Decodable::decode(d) };
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let mut lines = Vec::with_capacity(num_lines as usize);
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if num_lines > 0 {
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// Read the number of bytes used per diff.
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let bytes_per_diff: u8 = try! { Decodable::decode(d) };
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// Read the first element.
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let mut line_start: BytePos = try! { Decodable::decode(d) };
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lines.push(line_start);
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for _ in 1..num_lines {
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let diff = match bytes_per_diff {
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1 => try! { d.read_u8() } as u32,
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2 => try! { d.read_u16() } as u32,
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4 => try! { d.read_u32() },
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_ => unreachable!()
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};
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line_start = line_start + BytePos(diff);
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lines.push(line_start);
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}
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}
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Ok(lines)
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})
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};
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let multibyte_chars: Vec<MultiByteChar> = try! {
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d.read_struct_field("multibyte_chars", 4, |d| Decodable::decode(d))
|
|
};
|
|
Ok(FileMap {
|
|
name: name,
|
|
start_pos: start_pos,
|
|
end_pos: end_pos,
|
|
src: None,
|
|
lines: RefCell::new(lines),
|
|
multibyte_chars: RefCell::new(multibyte_chars)
|
|
})
|
|
})
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for FileMap {
|
|
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
|
write!(fmt, "FileMap({})", self.name)
|
|
}
|
|
}
|
|
|
|
impl FileMap {
|
|
/// EFFECT: register a start-of-line offset in the
|
|
/// table of line-beginnings.
|
|
/// UNCHECKED INVARIANT: these offsets must be added in the right
|
|
/// order and must be in the right places; there is shared knowledge
|
|
/// about what ends a line between this file and parse.rs
|
|
/// WARNING: pos param here is the offset relative to start of CodeMap,
|
|
/// and CodeMap will append a newline when adding a filemap without a newline at the end,
|
|
/// so the safe way to call this is with value calculated as
|
|
/// filemap.start_pos + newline_offset_relative_to_the_start_of_filemap.
|
|
pub fn next_line(&self, pos: BytePos) {
|
|
// the new charpos must be > the last one (or it's the first one).
|
|
let mut lines = self.lines.borrow_mut();
|
|
let line_len = lines.len();
|
|
assert!(line_len == 0 || ((*lines)[line_len - 1] < pos));
|
|
lines.push(pos);
|
|
}
|
|
|
|
/// get a line from the list of pre-computed line-beginnings.
|
|
/// line-number here is 0-based.
|
|
pub fn get_line(&self, line_number: usize) -> Option<&str> {
|
|
match self.src {
|
|
Some(ref src) => {
|
|
let lines = self.lines.borrow();
|
|
lines.get(line_number).map(|&line| {
|
|
let begin: BytePos = line - self.start_pos;
|
|
let begin = begin.to_usize();
|
|
// We can't use `lines.get(line_number+1)` because we might
|
|
// be parsing when we call this function and thus the current
|
|
// line is the last one we have line info for.
|
|
let slice = &src[begin..];
|
|
match slice.find('\n') {
|
|
Some(e) => &slice[..e],
|
|
None => slice
|
|
}
|
|
})
|
|
}
|
|
None => None
|
|
}
|
|
}
|
|
|
|
pub fn record_multibyte_char(&self, pos: BytePos, bytes: usize) {
|
|
assert!(bytes >=2 && bytes <= 4);
|
|
let mbc = MultiByteChar {
|
|
pos: pos,
|
|
bytes: bytes,
|
|
};
|
|
self.multibyte_chars.borrow_mut().push(mbc);
|
|
}
|
|
|
|
pub fn is_real_file(&self) -> bool {
|
|
!(self.name.starts_with("<") &&
|
|
self.name.ends_with(">"))
|
|
}
|
|
|
|
pub fn is_imported(&self) -> bool {
|
|
self.src.is_none()
|
|
}
|
|
|
|
fn count_lines(&self) -> usize {
|
|
self.lines.borrow().len()
|
|
}
|
|
}
|
|
|
|
/// An abstraction over the fs operations used by the Parser.
|
|
pub trait FileLoader {
|
|
/// Query the existence of a file.
|
|
fn file_exists(&self, path: &Path) -> bool;
|
|
|
|
/// Read the contents of an UTF-8 file into memory.
|
|
fn read_file(&self, path: &Path) -> io::Result<String>;
|
|
}
|
|
|
|
/// A FileLoader that uses std::fs to load real files.
|
|
pub struct RealFileLoader;
|
|
|
|
impl FileLoader for RealFileLoader {
|
|
fn file_exists(&self, path: &Path) -> bool {
|
|
fs::metadata(path).is_ok()
|
|
}
|
|
|
|
fn read_file(&self, path: &Path) -> io::Result<String> {
|
|
let mut src = String::new();
|
|
try!(try!(fs::File::open(path)).read_to_string(&mut src));
|
|
Ok(src)
|
|
}
|
|
}
|
|
|
|
// _____________________________________________________________________________
|
|
// CodeMap
|
|
//
|
|
|
|
pub struct CodeMap {
|
|
pub files: RefCell<Vec<Rc<FileMap>>>,
|
|
expansions: RefCell<Vec<ExpnInfo>>,
|
|
file_loader: Box<FileLoader>
|
|
}
|
|
|
|
impl CodeMap {
|
|
pub fn new() -> CodeMap {
|
|
CodeMap {
|
|
files: RefCell::new(Vec::new()),
|
|
expansions: RefCell::new(Vec::new()),
|
|
file_loader: Box::new(RealFileLoader)
|
|
}
|
|
}
|
|
|
|
pub fn with_file_loader(file_loader: Box<FileLoader>) -> CodeMap {
|
|
CodeMap {
|
|
files: RefCell::new(Vec::new()),
|
|
expansions: RefCell::new(Vec::new()),
|
|
file_loader: file_loader
|
|
}
|
|
}
|
|
|
|
pub fn file_exists(&self, path: &Path) -> bool {
|
|
self.file_loader.file_exists(path)
|
|
}
|
|
|
|
pub fn load_file(&self, path: &Path) -> io::Result<Rc<FileMap>> {
|
|
let src = try!(self.file_loader.read_file(path));
|
|
Ok(self.new_filemap(path.to_str().unwrap().to_string(), src))
|
|
}
|
|
|
|
fn next_start_pos(&self) -> usize {
|
|
let files = self.files.borrow();
|
|
match files.last() {
|
|
None => 0,
|
|
// Add one so there is some space between files. This lets us distinguish
|
|
// positions in the codemap, even in the presence of zero-length files.
|
|
Some(last) => last.end_pos.to_usize() + 1,
|
|
}
|
|
}
|
|
|
|
/// Creates a new filemap without setting its line information. If you don't
|
|
/// intend to set the line information yourself, you should use new_filemap_and_lines.
|
|
pub fn new_filemap(&self, filename: FileName, mut src: String) -> Rc<FileMap> {
|
|
let start_pos = self.next_start_pos();
|
|
let mut files = self.files.borrow_mut();
|
|
|
|
// Remove utf-8 BOM if any.
|
|
if src.starts_with("\u{feff}") {
|
|
src.drain(..3);
|
|
}
|
|
|
|
let end_pos = start_pos + src.len();
|
|
|
|
let filemap = Rc::new(FileMap {
|
|
name: filename,
|
|
src: Some(Rc::new(src)),
|
|
start_pos: Pos::from_usize(start_pos),
|
|
end_pos: Pos::from_usize(end_pos),
|
|
lines: RefCell::new(Vec::new()),
|
|
multibyte_chars: RefCell::new(Vec::new()),
|
|
});
|
|
|
|
files.push(filemap.clone());
|
|
|
|
filemap
|
|
}
|
|
|
|
/// Creates a new filemap and sets its line information.
|
|
pub fn new_filemap_and_lines(&self, filename: &str, src: &str) -> Rc<FileMap> {
|
|
let fm = self.new_filemap(filename.to_string(), src.to_owned());
|
|
let mut byte_pos: u32 = 0;
|
|
for line in src.lines() {
|
|
// register the start of this line
|
|
fm.next_line(BytePos(byte_pos));
|
|
|
|
// update byte_pos to include this line and the \n at the end
|
|
byte_pos += line.len() as u32 + 1;
|
|
}
|
|
fm
|
|
}
|
|
|
|
|
|
/// Allocates a new FileMap representing a source file from an external
|
|
/// crate. The source code of such an "imported filemap" is not available,
|
|
/// but we still know enough to generate accurate debuginfo location
|
|
/// information for things inlined from other crates.
|
|
pub fn new_imported_filemap(&self,
|
|
filename: FileName,
|
|
source_len: usize,
|
|
mut file_local_lines: Vec<BytePos>,
|
|
mut file_local_multibyte_chars: Vec<MultiByteChar>)
|
|
-> Rc<FileMap> {
|
|
let start_pos = self.next_start_pos();
|
|
let mut files = self.files.borrow_mut();
|
|
|
|
let end_pos = Pos::from_usize(start_pos + source_len);
|
|
let start_pos = Pos::from_usize(start_pos);
|
|
|
|
for pos in &mut file_local_lines {
|
|
*pos = *pos + start_pos;
|
|
}
|
|
|
|
for mbc in &mut file_local_multibyte_chars {
|
|
mbc.pos = mbc.pos + start_pos;
|
|
}
|
|
|
|
let filemap = Rc::new(FileMap {
|
|
name: filename,
|
|
src: None,
|
|
start_pos: start_pos,
|
|
end_pos: end_pos,
|
|
lines: RefCell::new(file_local_lines),
|
|
multibyte_chars: RefCell::new(file_local_multibyte_chars),
|
|
});
|
|
|
|
files.push(filemap.clone());
|
|
|
|
filemap
|
|
}
|
|
|
|
pub fn mk_substr_filename(&self, sp: Span) -> String {
|
|
let pos = self.lookup_char_pos(sp.lo);
|
|
(format!("<{}:{}:{}>",
|
|
pos.file.name,
|
|
pos.line,
|
|
pos.col.to_usize() + 1)).to_string()
|
|
}
|
|
|
|
/// Lookup source information about a BytePos
|
|
pub fn lookup_char_pos(&self, pos: BytePos) -> Loc {
|
|
let chpos = self.bytepos_to_file_charpos(pos);
|
|
match self.lookup_line(pos) {
|
|
Ok(FileMapAndLine { fm: f, line: a }) => {
|
|
let line = a + 1; // Line numbers start at 1
|
|
let linebpos = (*f.lines.borrow())[a];
|
|
let linechpos = self.bytepos_to_file_charpos(linebpos);
|
|
debug!("byte pos {:?} is on the line at byte pos {:?}",
|
|
pos, linebpos);
|
|
debug!("char pos {:?} is on the line at char pos {:?}",
|
|
chpos, linechpos);
|
|
debug!("byte is on line: {}", line);
|
|
assert!(chpos >= linechpos);
|
|
Loc {
|
|
file: f,
|
|
line: line,
|
|
col: chpos - linechpos,
|
|
}
|
|
}
|
|
Err(f) => {
|
|
Loc {
|
|
file: f,
|
|
line: 0,
|
|
col: chpos,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// If the relevant filemap is empty, we don't return a line number.
|
|
fn lookup_line(&self, pos: BytePos) -> Result<FileMapAndLine, Rc<FileMap>> {
|
|
let idx = self.lookup_filemap_idx(pos);
|
|
|
|
let files = self.files.borrow();
|
|
let f = (*files)[idx].clone();
|
|
|
|
let len = f.lines.borrow().len();
|
|
if len == 0 {
|
|
return Err(f);
|
|
}
|
|
|
|
let mut a = 0;
|
|
{
|
|
let lines = f.lines.borrow();
|
|
let mut b = lines.len();
|
|
while b - a > 1 {
|
|
let m = (a + b) / 2;
|
|
if (*lines)[m] > pos {
|
|
b = m;
|
|
} else {
|
|
a = m;
|
|
}
|
|
}
|
|
assert!(a <= lines.len());
|
|
}
|
|
Ok(FileMapAndLine { fm: f, line: a })
|
|
}
|
|
|
|
pub fn lookup_char_pos_adj(&self, pos: BytePos) -> LocWithOpt {
|
|
let loc = self.lookup_char_pos(pos);
|
|
LocWithOpt {
|
|
filename: loc.file.name.to_string(),
|
|
line: loc.line,
|
|
col: loc.col,
|
|
file: Some(loc.file)
|
|
}
|
|
}
|
|
|
|
pub fn span_to_string(&self, sp: Span) -> String {
|
|
if self.files.borrow().is_empty() && sp == DUMMY_SP {
|
|
return "no-location".to_string();
|
|
}
|
|
|
|
let lo = self.lookup_char_pos_adj(sp.lo);
|
|
let hi = self.lookup_char_pos_adj(sp.hi);
|
|
return (format!("{}:{}:{}: {}:{}",
|
|
lo.filename,
|
|
lo.line,
|
|
lo.col.to_usize() + 1,
|
|
hi.line,
|
|
hi.col.to_usize() + 1)).to_string()
|
|
}
|
|
|
|
pub fn span_to_filename(&self, sp: Span) -> FileName {
|
|
self.lookup_char_pos(sp.lo).file.name.to_string()
|
|
}
|
|
|
|
pub fn span_to_lines(&self, sp: Span) -> FileLinesResult {
|
|
if sp.lo > sp.hi {
|
|
return Err(SpanLinesError::IllFormedSpan(sp));
|
|
}
|
|
|
|
let lo = self.lookup_char_pos(sp.lo);
|
|
let hi = self.lookup_char_pos(sp.hi);
|
|
|
|
if lo.file.start_pos != hi.file.start_pos {
|
|
return Err(SpanLinesError::DistinctSources(DistinctSources {
|
|
begin: (lo.file.name.clone(), lo.file.start_pos),
|
|
end: (hi.file.name.clone(), hi.file.start_pos),
|
|
}));
|
|
}
|
|
assert!(hi.line >= lo.line);
|
|
|
|
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.
|
|
for line_index in lo.line-1 .. hi.line-1 {
|
|
let line_len = lo.file.get_line(line_index).map(|s| s.len()).unwrap_or(0);
|
|
lines.push(LineInfo { line_index: line_index,
|
|
start_col: 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 - 1,
|
|
start_col: start_col,
|
|
end_col: hi.col });
|
|
|
|
Ok(FileLines {file: lo.file, lines: lines})
|
|
}
|
|
|
|
pub fn span_to_snippet(&self, sp: Span) -> Result<String, SpanSnippetError> {
|
|
if sp.lo > sp.hi {
|
|
return Err(SpanSnippetError::IllFormedSpan(sp));
|
|
}
|
|
|
|
let local_begin = self.lookup_byte_offset(sp.lo);
|
|
let local_end = self.lookup_byte_offset(sp.hi);
|
|
|
|
if local_begin.fm.start_pos != local_end.fm.start_pos {
|
|
return Err(SpanSnippetError::DistinctSources(DistinctSources {
|
|
begin: (local_begin.fm.name.clone(),
|
|
local_begin.fm.start_pos),
|
|
end: (local_end.fm.name.clone(),
|
|
local_end.fm.start_pos)
|
|
}));
|
|
} else {
|
|
match local_begin.fm.src {
|
|
Some(ref src) => {
|
|
let start_index = local_begin.pos.to_usize();
|
|
let end_index = local_end.pos.to_usize();
|
|
let source_len = (local_begin.fm.end_pos -
|
|
local_begin.fm.start_pos).to_usize();
|
|
|
|
if start_index > end_index || end_index > source_len {
|
|
return Err(SpanSnippetError::MalformedForCodemap(
|
|
MalformedCodemapPositions {
|
|
name: local_begin.fm.name.clone(),
|
|
source_len: source_len,
|
|
begin_pos: local_begin.pos,
|
|
end_pos: local_end.pos,
|
|
}));
|
|
}
|
|
|
|
return Ok((&src[start_index..end_index]).to_string())
|
|
}
|
|
None => {
|
|
return Err(SpanSnippetError::SourceNotAvailable {
|
|
filename: local_begin.fm.name.clone()
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn get_filemap(&self, filename: &str) -> Rc<FileMap> {
|
|
for fm in self.files.borrow().iter() {
|
|
if filename == fm.name {
|
|
return fm.clone();
|
|
}
|
|
}
|
|
panic!("asking for {} which we don't know about", filename);
|
|
}
|
|
|
|
/// For a global BytePos compute the local offset within the containing FileMap
|
|
pub fn lookup_byte_offset(&self, bpos: BytePos) -> FileMapAndBytePos {
|
|
let idx = self.lookup_filemap_idx(bpos);
|
|
let fm = (*self.files.borrow())[idx].clone();
|
|
let offset = bpos - fm.start_pos;
|
|
FileMapAndBytePos {fm: fm, pos: offset}
|
|
}
|
|
|
|
/// Converts an absolute BytePos to a CharPos relative to the filemap.
|
|
pub fn bytepos_to_file_charpos(&self, bpos: BytePos) -> CharPos {
|
|
let idx = self.lookup_filemap_idx(bpos);
|
|
let files = self.files.borrow();
|
|
let map = &(*files)[idx];
|
|
|
|
// The number of extra bytes due to multibyte chars in the FileMap
|
|
let mut total_extra_bytes = 0;
|
|
|
|
for mbc in map.multibyte_chars.borrow().iter() {
|
|
debug!("{}-byte char at {:?}", mbc.bytes, mbc.pos);
|
|
if mbc.pos < bpos {
|
|
// every character is at least one byte, so we only
|
|
// count the actual extra bytes.
|
|
total_extra_bytes += mbc.bytes - 1;
|
|
// We should never see a byte position in the middle of a
|
|
// character
|
|
assert!(bpos.to_usize() >= mbc.pos.to_usize() + mbc.bytes);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
assert!(map.start_pos.to_usize() + total_extra_bytes <= bpos.to_usize());
|
|
CharPos(bpos.to_usize() - map.start_pos.to_usize() - total_extra_bytes)
|
|
}
|
|
|
|
// Return the index of the filemap (in self.files) which contains pos.
|
|
fn lookup_filemap_idx(&self, pos: BytePos) -> usize {
|
|
let files = self.files.borrow();
|
|
let files = &*files;
|
|
let count = files.len();
|
|
|
|
// Binary search for the filemap.
|
|
let mut a = 0;
|
|
let mut b = count;
|
|
while b - a > 1 {
|
|
let m = (a + b) / 2;
|
|
if files[m].start_pos > pos {
|
|
b = m;
|
|
} else {
|
|
a = m;
|
|
}
|
|
}
|
|
|
|
assert!(a < count, "position {} does not resolve to a source location", pos.to_usize());
|
|
|
|
return a;
|
|
}
|
|
|
|
pub fn record_expansion(&self, expn_info: ExpnInfo) -> ExpnId {
|
|
let mut expansions = self.expansions.borrow_mut();
|
|
expansions.push(expn_info);
|
|
let len = expansions.len();
|
|
if len > u32::max_value() as usize {
|
|
panic!("too many ExpnInfo's!");
|
|
}
|
|
ExpnId(len as u32 - 1)
|
|
}
|
|
|
|
pub fn with_expn_info<T, F>(&self, id: ExpnId, f: F) -> T where
|
|
F: FnOnce(Option<&ExpnInfo>) -> T,
|
|
{
|
|
match id {
|
|
NO_EXPANSION | COMMAND_LINE_EXPN => f(None),
|
|
ExpnId(i) => f(Some(&(*self.expansions.borrow())[i as usize]))
|
|
}
|
|
}
|
|
|
|
/// Check if a span is "internal" to a macro in which #[unstable]
|
|
/// items can be used (that is, a macro marked with
|
|
/// `#[allow_internal_unstable]`).
|
|
pub fn span_allows_unstable(&self, span: Span) -> bool {
|
|
debug!("span_allows_unstable(span = {:?})", span);
|
|
let mut allows_unstable = false;
|
|
let mut expn_id = span.expn_id;
|
|
loop {
|
|
let quit = self.with_expn_info(expn_id, |expninfo| {
|
|
debug!("span_allows_unstable: expninfo = {:?}", expninfo);
|
|
expninfo.map_or(/* hit the top level */ true, |info| {
|
|
|
|
let span_comes_from_this_expansion =
|
|
info.callee.span.map_or(span == info.call_site, |mac_span| {
|
|
mac_span.contains(span)
|
|
});
|
|
|
|
debug!("span_allows_unstable: span: {:?} call_site: {:?} callee: {:?}",
|
|
(span.lo, span.hi),
|
|
(info.call_site.lo, info.call_site.hi),
|
|
info.callee.span.map(|x| (x.lo, x.hi)));
|
|
debug!("span_allows_unstable: from this expansion? {}, allows unstable? {}",
|
|
span_comes_from_this_expansion,
|
|
info.callee.allow_internal_unstable);
|
|
if span_comes_from_this_expansion {
|
|
allows_unstable = info.callee.allow_internal_unstable;
|
|
// we've found the right place, stop looking
|
|
true
|
|
} else {
|
|
// not the right place, keep looking
|
|
expn_id = info.call_site.expn_id;
|
|
false
|
|
}
|
|
})
|
|
});
|
|
if quit {
|
|
break
|
|
}
|
|
}
|
|
debug!("span_allows_unstable? {}", allows_unstable);
|
|
allows_unstable
|
|
}
|
|
|
|
pub fn count_lines(&self) -> usize {
|
|
self.files.borrow().iter().fold(0, |a, f| a + f.count_lines())
|
|
}
|
|
}
|
|
|
|
// _____________________________________________________________________________
|
|
// SpanLinesError, SpanSnippetError, DistinctSources, MalformedCodemapPositions
|
|
//
|
|
|
|
pub type FileLinesResult = Result<FileLines, SpanLinesError>;
|
|
|
|
#[derive(Clone, PartialEq, Eq, Debug)]
|
|
pub enum SpanLinesError {
|
|
IllFormedSpan(Span),
|
|
DistinctSources(DistinctSources),
|
|
}
|
|
|
|
#[derive(Clone, PartialEq, Eq, Debug)]
|
|
pub enum SpanSnippetError {
|
|
IllFormedSpan(Span),
|
|
DistinctSources(DistinctSources),
|
|
MalformedForCodemap(MalformedCodemapPositions),
|
|
SourceNotAvailable { filename: String }
|
|
}
|
|
|
|
#[derive(Clone, PartialEq, Eq, Debug)]
|
|
pub struct DistinctSources {
|
|
begin: (String, BytePos),
|
|
end: (String, BytePos)
|
|
}
|
|
|
|
#[derive(Clone, PartialEq, Eq, Debug)]
|
|
pub struct MalformedCodemapPositions {
|
|
name: String,
|
|
source_len: usize,
|
|
begin_pos: BytePos,
|
|
end_pos: BytePos
|
|
}
|
|
|
|
|
|
// _____________________________________________________________________________
|
|
// Tests
|
|
//
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn t1 () {
|
|
let cm = CodeMap::new();
|
|
let fm = cm.new_filemap("blork.rs".to_string(),
|
|
"first line.\nsecond line".to_string());
|
|
fm.next_line(BytePos(0));
|
|
// Test we can get lines with partial line info.
|
|
assert_eq!(fm.get_line(0), Some("first line."));
|
|
// TESTING BROKEN BEHAVIOR: line break declared before actual line break.
|
|
fm.next_line(BytePos(10));
|
|
assert_eq!(fm.get_line(1), Some("."));
|
|
fm.next_line(BytePos(12));
|
|
assert_eq!(fm.get_line(2), Some("second line"));
|
|
}
|
|
|
|
#[test]
|
|
#[should_panic]
|
|
fn t2 () {
|
|
let cm = CodeMap::new();
|
|
let fm = cm.new_filemap("blork.rs".to_string(),
|
|
"first line.\nsecond line".to_string());
|
|
// TESTING *REALLY* BROKEN BEHAVIOR:
|
|
fm.next_line(BytePos(0));
|
|
fm.next_line(BytePos(10));
|
|
fm.next_line(BytePos(2));
|
|
}
|
|
|
|
fn init_code_map() -> CodeMap {
|
|
let cm = CodeMap::new();
|
|
let fm1 = cm.new_filemap("blork.rs".to_string(),
|
|
"first line.\nsecond line".to_string());
|
|
let fm2 = cm.new_filemap("empty.rs".to_string(),
|
|
"".to_string());
|
|
let fm3 = cm.new_filemap("blork2.rs".to_string(),
|
|
"first line.\nsecond line".to_string());
|
|
|
|
fm1.next_line(BytePos(0));
|
|
fm1.next_line(BytePos(12));
|
|
fm2.next_line(fm2.start_pos);
|
|
fm3.next_line(fm3.start_pos);
|
|
fm3.next_line(fm3.start_pos + BytePos(12));
|
|
|
|
cm
|
|
}
|
|
|
|
#[test]
|
|
fn t3() {
|
|
// Test lookup_byte_offset
|
|
let cm = init_code_map();
|
|
|
|
let fmabp1 = cm.lookup_byte_offset(BytePos(23));
|
|
assert_eq!(fmabp1.fm.name, "blork.rs");
|
|
assert_eq!(fmabp1.pos, BytePos(23));
|
|
|
|
let fmabp1 = cm.lookup_byte_offset(BytePos(24));
|
|
assert_eq!(fmabp1.fm.name, "empty.rs");
|
|
assert_eq!(fmabp1.pos, BytePos(0));
|
|
|
|
let fmabp2 = cm.lookup_byte_offset(BytePos(25));
|
|
assert_eq!(fmabp2.fm.name, "blork2.rs");
|
|
assert_eq!(fmabp2.pos, BytePos(0));
|
|
}
|
|
|
|
#[test]
|
|
fn t4() {
|
|
// Test bytepos_to_file_charpos
|
|
let cm = init_code_map();
|
|
|
|
let cp1 = cm.bytepos_to_file_charpos(BytePos(22));
|
|
assert_eq!(cp1, CharPos(22));
|
|
|
|
let cp2 = cm.bytepos_to_file_charpos(BytePos(25));
|
|
assert_eq!(cp2, CharPos(0));
|
|
}
|
|
|
|
#[test]
|
|
fn t5() {
|
|
// Test zero-length filemaps.
|
|
let cm = init_code_map();
|
|
|
|
let loc1 = cm.lookup_char_pos(BytePos(22));
|
|
assert_eq!(loc1.file.name, "blork.rs");
|
|
assert_eq!(loc1.line, 2);
|
|
assert_eq!(loc1.col, CharPos(10));
|
|
|
|
let loc2 = cm.lookup_char_pos(BytePos(25));
|
|
assert_eq!(loc2.file.name, "blork2.rs");
|
|
assert_eq!(loc2.line, 1);
|
|
assert_eq!(loc2.col, CharPos(0));
|
|
}
|
|
|
|
fn init_code_map_mbc() -> CodeMap {
|
|
let cm = CodeMap::new();
|
|
// € is a three byte utf8 char.
|
|
let fm1 =
|
|
cm.new_filemap("blork.rs".to_string(),
|
|
"fir€st €€€€ line.\nsecond line".to_string());
|
|
let fm2 = cm.new_filemap("blork2.rs".to_string(),
|
|
"first line€€.\n€ second line".to_string());
|
|
|
|
fm1.next_line(BytePos(0));
|
|
fm1.next_line(BytePos(28));
|
|
fm2.next_line(fm2.start_pos);
|
|
fm2.next_line(fm2.start_pos + BytePos(20));
|
|
|
|
fm1.record_multibyte_char(BytePos(3), 3);
|
|
fm1.record_multibyte_char(BytePos(9), 3);
|
|
fm1.record_multibyte_char(BytePos(12), 3);
|
|
fm1.record_multibyte_char(BytePos(15), 3);
|
|
fm1.record_multibyte_char(BytePos(18), 3);
|
|
fm2.record_multibyte_char(fm2.start_pos + BytePos(10), 3);
|
|
fm2.record_multibyte_char(fm2.start_pos + BytePos(13), 3);
|
|
fm2.record_multibyte_char(fm2.start_pos + BytePos(18), 3);
|
|
|
|
cm
|
|
}
|
|
|
|
#[test]
|
|
fn t6() {
|
|
// Test bytepos_to_file_charpos in the presence of multi-byte chars
|
|
let cm = init_code_map_mbc();
|
|
|
|
let cp1 = cm.bytepos_to_file_charpos(BytePos(3));
|
|
assert_eq!(cp1, CharPos(3));
|
|
|
|
let cp2 = cm.bytepos_to_file_charpos(BytePos(6));
|
|
assert_eq!(cp2, CharPos(4));
|
|
|
|
let cp3 = cm.bytepos_to_file_charpos(BytePos(56));
|
|
assert_eq!(cp3, CharPos(12));
|
|
|
|
let cp4 = cm.bytepos_to_file_charpos(BytePos(61));
|
|
assert_eq!(cp4, CharPos(15));
|
|
}
|
|
|
|
#[test]
|
|
fn t7() {
|
|
// Test span_to_lines for a span ending at the end of filemap
|
|
let cm = init_code_map();
|
|
let span = Span {lo: BytePos(12), hi: BytePos(23), expn_id: NO_EXPANSION};
|
|
let file_lines = cm.span_to_lines(span).unwrap();
|
|
|
|
assert_eq!(file_lines.file.name, "blork.rs");
|
|
assert_eq!(file_lines.lines.len(), 1);
|
|
assert_eq!(file_lines.lines[0].line_index, 1);
|
|
}
|
|
|
|
/// Given a string like " ^~~~~~~~~~~~ ", produces a span
|
|
/// coverting that range. The idea is that the string has the same
|
|
/// length as the input, and we uncover the byte positions. Note
|
|
/// that this can span lines and so on.
|
|
fn span_from_selection(input: &str, selection: &str) -> Span {
|
|
assert_eq!(input.len(), selection.len());
|
|
let left_index = selection.find('^').unwrap() as u32;
|
|
let right_index = selection.rfind('~').unwrap() as u32;
|
|
Span { lo: BytePos(left_index), hi: BytePos(right_index + 1), expn_id: NO_EXPANSION }
|
|
}
|
|
|
|
/// Test span_to_snippet and span_to_lines for a span coverting 3
|
|
/// lines in the middle of a file.
|
|
#[test]
|
|
fn span_to_snippet_and_lines_spanning_multiple_lines() {
|
|
let cm = CodeMap::new();
|
|
let inputtext = "aaaaa\nbbbbBB\nCCC\nDDDDDddddd\neee\n";
|
|
let selection = " \n ^~\n~~~\n~~~~~ \n \n";
|
|
cm.new_filemap_and_lines("blork.rs", inputtext);
|
|
let span = span_from_selection(inputtext, selection);
|
|
|
|
// check that we are extracting the text we thought we were extracting
|
|
assert_eq!(&cm.span_to_snippet(span).unwrap(), "BB\nCCC\nDDDDD");
|
|
|
|
// check that span_to_lines gives us the complete result with the lines/cols we expected
|
|
let lines = cm.span_to_lines(span).unwrap();
|
|
let expected = vec![
|
|
LineInfo { line_index: 1, start_col: CharPos(4), end_col: CharPos(6) },
|
|
LineInfo { line_index: 2, start_col: CharPos(0), end_col: CharPos(3) },
|
|
LineInfo { line_index: 3, start_col: CharPos(0), end_col: CharPos(5) }
|
|
];
|
|
assert_eq!(lines.lines, expected);
|
|
}
|
|
|
|
#[test]
|
|
fn t8() {
|
|
// Test span_to_snippet for a span ending at the end of filemap
|
|
let cm = init_code_map();
|
|
let span = Span {lo: BytePos(12), hi: BytePos(23), expn_id: NO_EXPANSION};
|
|
let snippet = cm.span_to_snippet(span);
|
|
|
|
assert_eq!(snippet, Ok("second line".to_string()));
|
|
}
|
|
|
|
#[test]
|
|
fn t9() {
|
|
// Test span_to_str for a span ending at the end of filemap
|
|
let cm = init_code_map();
|
|
let span = Span {lo: BytePos(12), hi: BytePos(23), expn_id: NO_EXPANSION};
|
|
let sstr = cm.span_to_string(span);
|
|
|
|
assert_eq!(sstr, "blork.rs:2:1: 2:12");
|
|
}
|
|
}
|