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use serde::Serialize;
use std::{collections::HashMap, ffi::c_void, time::Instant};
#[cfg(feature = "jemalloc")]
pub mod jemalloc;
pub mod time;
#[derive(Copy, Clone, Debug)]
#[allow(dead_code)]
pub enum ProfStartTime {
Instant(Instant),
TimeImmemorial,
}
#[derive(Clone, Debug)]
pub struct WeightedStack {
pub addrs: Vec<usize>,
pub weight: f64,
}
#[derive(Default)]
pub struct StackProfile {
annotations: Vec<String>,
stacks: Vec<(WeightedStack, Option<usize>)>,
}
pub struct StackProfileIter<'a> {
inner: &'a StackProfile,
idx: usize,
}
impl<'a> Iterator for StackProfileIter<'a> {
type Item = (&'a WeightedStack, Option<&'a str>);
fn next(&mut self) -> Option<Self::Item> {
let (stack, anno) = self.inner.stacks.get(self.idx)?;
self.idx += 1;
let anno = anno.map(|idx| self.inner.annotations.get(idx).unwrap().as_str());
Some((stack, anno))
}
}
impl StackProfile {
pub fn push(&mut self, stack: WeightedStack, annotation: Option<&str>) {
let anno_idx = if let Some(annotation) = annotation {
Some(
self.annotations
.iter()
.position(|anno| annotation == anno.as_str())
.unwrap_or_else(|| {
self.annotations.push(annotation.to_string());
self.annotations.len() - 1
}),
)
} else {
None
};
self.stacks.push((stack, anno_idx))
}
pub fn iter(&self) -> StackProfileIter<'_> {
StackProfileIter {
inner: self,
idx: 0,
}
}
}
#[derive(Serialize)]
pub struct SymbolTrieNode {
pub name: String,
pub weight: f64,
links: Vec<usize>,
}
#[derive(Serialize)]
pub struct WeightedSymbolTrie {
arena: Vec<SymbolTrieNode>,
}
impl WeightedSymbolTrie {
fn new() -> Self {
let root = SymbolTrieNode {
name: "".to_string(),
weight: 0.0,
links: vec![],
};
let arena = vec![root];
Self { arena }
}
pub fn dfs<F: FnMut(&SymbolTrieNode), G: FnMut(&SymbolTrieNode, bool)>(
&self,
mut pre: F,
mut post: G,
) {
self.dfs_inner(0, &mut pre, &mut post, true);
}
fn dfs_inner<F: FnMut(&SymbolTrieNode), G: FnMut(&SymbolTrieNode, bool)>(
&self,
cur: usize,
pre: &mut F,
post: &mut G,
is_last: bool,
) {
let node = &self.arena[cur];
pre(node);
for &link_idx in node.links.iter() {
let is_last = link_idx == *node.links.last().unwrap();
self.dfs_inner(link_idx, pre, post, is_last);
}
post(node, is_last);
}
fn step(&mut self, node: usize, next_name: &str) -> usize {
for &link_idx in self.arena[node].links.iter() {
if next_name == self.arena[link_idx].name {
return link_idx;
}
}
let next = SymbolTrieNode {
name: next_name.to_string(),
weight: 0.0,
links: vec![],
};
let idx = self.arena.len();
self.arena.push(next);
self.arena[node].links.push(idx);
idx
}
fn node_mut(&mut self, idx: usize) -> &mut SymbolTrieNode {
&mut self.arena[idx]
}
}
pub fn symbolicate(profile: &StackProfile) -> HashMap<usize, Vec<String>> {
let mut all_addrs = vec![];
for (stack, _annotation) in profile.stacks.iter() {
all_addrs.extend(stack.addrs.iter().cloned());
}
all_addrs.sort_unstable();
all_addrs.dedup();
all_addrs
.into_iter()
.map(|addr| {
let mut syms = vec![];
backtrace::resolve(addr as *mut c_void, |sym| {
let name = sym
.name()
.map(|sn| sn.to_string())
.unwrap_or_else(|| "???".to_string());
syms.push(name);
});
syms.reverse();
(addr, syms)
})
.collect()
}
pub fn collate_stacks(profile: StackProfile) -> WeightedSymbolTrie {
let addr_to_symbols = symbolicate(&profile);
let mut trie = WeightedSymbolTrie::new();
let StackProfile {
annotations,
stacks,
} = profile;
let any_annotation = !annotations.is_empty();
for (stack, annotation) in stacks {
let mut cur = if any_annotation {
let annotation = annotation
.map(|idx| annotations[idx].as_str())
.unwrap_or("unknown");
trie.node_mut(0).weight += stack.weight;
trie.step(0, annotation)
} else {
0
};
for name in stack
.addrs
.into_iter()
.flat_map(|addr| addr_to_symbols.get(&addr).unwrap().iter())
{
trie.node_mut(cur).weight += stack.weight;
cur = trie.step(cur, name);
}
trie.node_mut(cur).weight += stack.weight;
}
trie
}