cc6e8e1af2
Groups all CL data structures into single dependency to be used accross wasmtime project.
72 lines
2.1 KiB
Rust
72 lines
2.1 KiB
Rust
use lazy_static::lazy_static;
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use std::collections::HashMap;
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use std::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};
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use wasmtime_environ::ir;
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lazy_static! {
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static ref REGISTRY: RwLock<TrapRegistry> = RwLock::new(TrapRegistry::default());
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}
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/// The registry maintains descriptions of traps in currently allocated functions.
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#[derive(Default)]
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pub struct TrapRegistry {
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traps: HashMap<usize, TrapDescription>,
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}
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/// Description of a trap.
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#[derive(Clone, Copy, PartialEq, Debug)]
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pub struct TrapDescription {
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/// Location of the trap in source binary module.
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pub source_loc: ir::SourceLoc,
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/// Code of the trap.
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pub trap_code: ir::TrapCode,
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}
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/// RAII guard for deregistering traps
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pub struct TrapRegistrationGuard(usize);
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impl TrapRegistry {
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/// Registers a new trap.
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/// Returns a RAII guard that deregisters the trap when dropped.
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pub fn register_trap(
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&mut self,
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address: usize,
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source_loc: ir::SourceLoc,
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trap_code: ir::TrapCode,
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) -> TrapRegistrationGuard {
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let entry = TrapDescription {
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source_loc,
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trap_code,
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};
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let previous_trap = self.traps.insert(address, entry);
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assert!(previous_trap.is_none());
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TrapRegistrationGuard(address)
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}
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fn deregister_trap(&mut self, address: usize) {
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assert!(self.traps.remove(&address).is_some());
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}
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/// Gets a trap description at given address.
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pub fn get_trap(&self, address: usize) -> Option<TrapDescription> {
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self.traps.get(&address).copied()
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}
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}
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impl Drop for TrapRegistrationGuard {
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fn drop(&mut self) {
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let mut registry = get_mut_trap_registry();
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registry.deregister_trap(self.0);
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}
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}
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/// Gets guarded writable reference to traps registry
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pub fn get_mut_trap_registry() -> RwLockWriteGuard<'static, TrapRegistry> {
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REGISTRY.write().expect("trap registry lock got poisoned")
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}
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/// Gets guarded readable reference to traps registry
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pub fn get_trap_registry() -> RwLockReadGuard<'static, TrapRegistry> {
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REGISTRY.read().expect("trap registry lock got poisoned")
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}
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