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https://github.com/bspeice/qadapt
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Rustfmt run
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1faa353706
commit
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52
src/lib.rs
52
src/lib.rs
@ -26,8 +26,8 @@ use libc::c_void;
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use libc::free;
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use libc::malloc;
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use spin::RwLock;
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use std::alloc::Layout;
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use std::alloc::GlobalAlloc;
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use std::alloc::Layout;
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use std::thread;
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thread_local! {
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@ -41,22 +41,25 @@ pub struct QADAPT;
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/// panics should be triggered if allocations/drops happen while we are running.
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pub fn enter_protected() {
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if thread::panicking() {
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return
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return;
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}
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PROTECTION_LEVEL.try_with(|v| {
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PROTECTION_LEVEL
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.try_with(|v| {
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*v.write() += 1;
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}).unwrap_or_else(|_e| ());
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})
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.unwrap_or_else(|_e| ());
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}
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/// Let QADAPT know that we are exiting a protected region. Will panic
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/// if we attempt to [`exit_protected`] more times than we [`enter_protected`].
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pub fn exit_protected() {
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if thread::panicking() {
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return
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return;
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}
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PROTECTION_LEVEL.try_with(|v| {
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PROTECTION_LEVEL
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.try_with(|v| {
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let val = { *v.read() };
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match val {
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v if v == 0 => panic!("Attempt to exit protected too many times"),
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@ -64,7 +67,8 @@ pub fn exit_protected() {
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*v.write() -= 1;
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}
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}
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}).unwrap_or_else(|_e| ());
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})
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.unwrap_or_else(|_e| ());
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}
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static INTERNAL_ALLOCATION: RwLock<usize> = RwLock::new(usize::max_value());
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@ -74,9 +78,9 @@ unsafe fn claim_internal_alloc() {
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match INTERNAL_ALLOCATION.write() {
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ref mut lock if **lock == usize::max_value() => {
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**lock = thread_id::get();
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break
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},
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_ => ()
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break;
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}
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_ => (),
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}
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}
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}
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@ -84,7 +88,7 @@ unsafe fn claim_internal_alloc() {
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unsafe fn release_internal_alloc() {
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match INTERNAL_ALLOCATION.write() {
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ref mut lock if **lock == thread_id::get() => **lock = usize::max_value(),
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_ => panic!("Internal allocation tracking error")
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_ => panic!("Internal allocation tracking error"),
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}
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}
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@ -103,7 +107,8 @@ unsafe impl GlobalAlloc for QADAPT {
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// Because accessing PROTECTION_LEVEL has the potential to trigger an allocation,
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// we need to spin until we can claim the INTERNAL_ALLOCATION lock for our thread.
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claim_internal_alloc();
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let protection_level: Result<usize, ()> = PROTECTION_LEVEL.try_with(|v| *v.read()).or(Ok(0));
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let protection_level: Result<usize, ()> =
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PROTECTION_LEVEL.try_with(|v| *v.read()).or(Ok(0));
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release_internal_alloc();
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match protection_level {
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@ -112,9 +117,13 @@ unsafe impl GlobalAlloc for QADAPT {
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// Tripped a bad allocation, but make sure further memory access during unwind
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// doesn't have issues
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PROTECTION_LEVEL.with(|v| *v.write() = 0);
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panic!("Unexpected allocation for size {}, protection level: {}", layout.size(), v)
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},
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Err(_) => unreachable!()
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panic!(
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"Unexpected allocation for size {}, protection level: {}",
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layout.size(),
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v
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)
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}
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Err(_) => unreachable!(),
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}
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}
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@ -124,7 +133,8 @@ unsafe impl GlobalAlloc for QADAPT {
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}
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claim_internal_alloc();
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let protection_level: Result<usize, ()> = PROTECTION_LEVEL.try_with(|v| *v.read()).or(Ok(0));
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let protection_level: Result<usize, ()> =
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PROTECTION_LEVEL.try_with(|v| *v.read()).or(Ok(0));
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release_internal_alloc();
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// Free before checking panic to make sure we avoid leaks
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@ -134,9 +144,13 @@ unsafe impl GlobalAlloc for QADAPT {
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// Tripped a bad dealloc, but make sure further memory access during unwind
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// doesn't have issues
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PROTECTION_LEVEL.with(|v| *v.write() = 0);
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panic!("Unexpected deallocation for size {}, protection level: {}", layout.size(), v)
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},
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_ => ()
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panic!(
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"Unexpected deallocation for size {}, protection level: {}",
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layout.size(),
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v
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)
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}
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_ => (),
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}
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}
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}
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@ -1,9 +1,9 @@
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#![feature(asm)]
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extern crate qadapt;
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use qadapt::QADAPT;
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use qadapt::enter_protected;
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use qadapt::exit_protected;
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use qadapt::QADAPT;
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#[global_allocator]
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static Q: QADAPT = QADAPT;
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@ -41,10 +41,14 @@ fn unit_result(b: bool) -> Result<(), ()> {
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fn test_unit_result() {
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enter_protected();
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#[allow(unused)]
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{ black_box(unit_result(true)); }
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{
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black_box(unit_result(true));
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}
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black_box(unit_result(true)).unwrap();
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#[allow(unused)]
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{ black_box(unit_result(false)); }
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{
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black_box(unit_result(false));
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}
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black_box(unit_result(false)).unwrap_err();
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exit_protected();
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}
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@ -2,7 +2,6 @@ extern crate qadapt;
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use qadapt::allocate_panic;
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#[allocate_panic]
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fn allocates() {
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let _v: Vec<()> = Vec::with_capacity(1);
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