zirium 0.4.0

Lossless textual MLIR syntax parsing and semantic processing
Documentation 
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use std::alloc::{GlobalAlloc, Layout, System};
use std::sync::atomic::{AtomicIsize, Ordering};

struct CountingAllocator;
static LIVE: AtomicIsize = AtomicIsize::new(0);
static PEAK: AtomicIsize = AtomicIsize::new(0);

unsafe impl GlobalAlloc for CountingAllocator {
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        let pointer = unsafe { System.alloc(layout) };
        if !pointer.is_null() {
            record(layout.size() as isize);
        }
        pointer
    }

    unsafe fn dealloc(&self, pointer: *mut u8, layout: Layout) {
        LIVE.fetch_sub(layout.size() as isize, Ordering::Relaxed);
        unsafe { System.dealloc(pointer, layout) }
    }

    unsafe fn realloc(&self, pointer: *mut u8, old: Layout, size: usize) -> *mut u8 {
        let result = unsafe { System.realloc(pointer, old, size) };
        if !result.is_null() {
            record(size as isize - old.size() as isize);
        }
        result
    }
}

#[global_allocator]
static ALLOCATOR: CountingAllocator = CountingAllocator;

fn record(delta: isize) {
    let live = LIVE.fetch_add(delta, Ordering::Relaxed) + delta;
    PEAK.fetch_max(live, Ordering::Relaxed);
}

pub(crate) fn begin() -> isize {
    let baseline = LIVE.load(Ordering::Relaxed);
    PEAK.store(baseline, Ordering::Relaxed);
    baseline
}

pub(crate) fn finish(baseline: isize) -> usize {
    PEAK.load(Ordering::Relaxed).saturating_sub(baseline) as usize
}