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#![allow(clippy::missing_errors_doc)]
use line_span::LineSpans;
// https://llvm.org/docs/LangRef.html
use owo_colors::OwoColorize;
use regex::Regex;
use crate::Dumpable;
use crate::{
color,
demangle::{self, contents},
opts::Format,
safeprintln, Item,
};
use std::{
collections::BTreeMap,
fs::File,
io::{BufRead, BufReader},
ops::Range,
path::Path,
};
#[derive(Debug)]
enum State {
Skipping,
Seeking,
Name,
Type,
Define,
}
pub struct Llvm;
impl Dumpable for Llvm {
type Line<'a> = &'a str;
fn split_lines(contents: &str) -> anyhow::Result<Vec<Self::Line<'_>>> {
Ok(contents
.line_spans()
.map(|s| s.as_str())
.collect::<Vec<_>>())
}
fn find_items(lines: &[&str]) -> BTreeMap<Item, Range<usize>> {
struct ItemParseState {
item: Item,
start: usize,
}
let mut res = BTreeMap::new();
let mut current_item = None::<ItemParseState>;
let regex = Regex::new("@\"?(_?[a-zA-Z0-9_$.]+)\"?\\(").expect("regexp should be valid");
for (ix, &line) in lines.iter().enumerate() {
if line.starts_with("; Module") || line.starts_with("; Function Attrs: ") {
#[allow(clippy::needless_continue)] // silly clippy, readability suffers otherwise
continue;
} else if let (true, Some(name)) = (current_item.is_none(), line.strip_prefix("; ")) {
current_item = Some(ItemParseState {
item: Item {
mangled_name: name.to_owned(),
name: name.to_owned(),
hashed: String::new(),
index: res.len(),
len: 0,
non_blank_len: 0,
},
start: ix,
});
} else if line.starts_with("define ") {
if let Some(name) = regex.captures(line).and_then(|c| c.get(1)) {
let name = name.as_str();
let cur = current_item.get_or_insert_with(|| ItemParseState {
item: Item {
mangled_name: String::new(),
name: name.to_owned(),
hashed: String::new(),
index: res.len(),
len: 0,
non_blank_len: 0,
},
start: ix,
});
name.clone_into(&mut cur.item.mangled_name);
cur.item.hashed = demangle::demangled(name)
.map_or_else(|| name.to_owned(), |hashed| format!("{hashed:?}"));
}
} else if !line_is_blank(line) {
if let Some(cur) = &mut current_item {
cur.item.non_blank_len += 1;
}
} else if line == "}" {
if let Some(mut cur) = current_item.take() {
let range = cur.start..ix + 1;
cur.item.len = range.len();
res.insert(cur.item, range);
}
}
}
res
}
fn dump_range(&self, fmt: &Format, strings: &[&str]) -> anyhow::Result<()> {
for line in strings {
if line.starts_with("; ") {
safeprintln!("{}", color!(line, OwoColorize::bright_cyan));
} else {
let line = contents(line, fmt.name_display);
safeprintln!("{line}");
}
}
Ok(())
}
}
/// Returns true if the line should not be counted as meaningful for the function definition.
///
/// LLVM functions can contain whitespace-only lines or lines with labels/comments that are not codegened,
/// thus counted towards function size.
/// llvm-lines uses similar heuristic to drop lines from its counts.
fn line_is_blank(line: &str) -> bool {
// Valid instructions have exactly two spaces as formatting.
// Notable exceptions include comments (lines starting with ';') and
// labels (lines starting with alphanumeric characters).
let is_comment_or_label = !line.starts_with(" ");
// That's not the end of story though. A line can have more than two spaces at the start of line,
// but in that case it is an extension of the instruction started at previous line.
// For example:
// invoke void @_ZN4bpaf7literal17hd39eb03fefd4e354E(ptr sret(%"bpaf::params::ParseAny<()>") align 8 %_5, ptr align 1 %cmd.0, i64 %cmd.1)
// to label %bb1 unwind label %cleanup, !dbg !4048
//
// First line is an instruction, so it should be counted towards function size.
// The second one is a part of the instruction started on the previous line, so we should not
// count that towards the function size.
let is_multiline_instruction_extension = line.starts_with(" ");
is_comment_or_label || is_multiline_instruction_extension
}
/// try to print `goal` from `path`, collect available items otherwise
pub fn collect_or_dump(
goal: Option<(&str, usize)>,
path: &Path,
fmt: &Format,
items: &mut Vec<Item>,
) -> anyhow::Result<bool> {
let mut seen = false;
let reader = BufReader::new(File::open(path)?);
let regex = Regex::new("@\"?(_?_[a-zA-Z0-9_$.]+)\"?\\(")?;
let mut state = State::Seeking;
let mut name = String::new();
let mut attrs = String::new();
let mut current_item = None::<Item>;
let mut names = BTreeMap::new();
for (ix, line) in reader.lines().enumerate() {
let line = line?;
// glorious state machine
match state {
State::Skipping => {
current_item = None;
if line.is_empty() {
state = State::Seeking;
}
}
State::Seeking => {
if let Some(name_str) = line.strip_prefix("; ") {
state = State::Name;
name = name_str.to_string();
} else {
state = State::Skipping;
}
}
State::Name => {
if line.starts_with("; Function Attrs: ") {
state = State::Type;
attrs = line;
} else {
state = State::Skipping;
}
}
State::Type => {
if line.starts_with("define ") {
state = State::Define;
if let Some((mangled_name, hashed)) = regex
.captures(&line)
.and_then(|c| c.get(1))
.map(|c| c.as_str())
.and_then(|c| Some((c.to_owned(), demangle::demangled(c)?)))
{
let hashed = format!("{hashed:?}");
let name_entry = names.entry(name.clone()).or_insert(0);
seen = goal.is_none_or(|goal| {
(name.as_ref(), *name_entry) == goal || hashed == goal.0
});
current_item = Some(Item {
mangled_name,
name: name.clone(),
hashed,
index: *name_entry,
len: ix,
non_blank_len: 0,
});
*name_entry += 1;
if seen {
safeprintln!("{}", color!(name, OwoColorize::cyan));
safeprintln!("{}", color!(attrs, OwoColorize::cyan));
safeprintln!("{}", contents(&line, fmt.name_display));
}
} else {
state = State::Skipping;
}
} else {
state = State::Skipping;
}
}
State::Define => {
if seen {
safeprintln!("{}", contents(&line, fmt.name_display));
}
if line == "}" {
if let Some(mut cur) = current_item.take() {
cur.len = ix - cur.len;
cur.non_blank_len = cur.len;
if goal.is_none_or(|goal| goal.0.is_empty() || cur.name.contains(goal.0)) {
items.push(cur);
}
}
if seen {
return Ok(true);
}
state = State::Skipping;
}
}
}
}
Ok(seen)
}