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Update singlepass backend to support metering.

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This commit is contained in:
losfair
2019-05-17 01:11:22 +08:00
parent 7e79dd2cfe
commit e7297b9465
2 changed files with 79 additions and 4 deletions
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12
lib/singlepass-backend/src/protect_unix.rs
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@ -35,7 +35,9 @@ extern "C" fn signal_trap_handler(
let bkpt_map = BKPT_MAP.with(|x| x.borrow().last().map(|x| x.clone()));
if let Some(bkpt_map) = bkpt_map {
if let Some(ref x) = bkpt_map.get(&(ip as usize)) {
(x)(BkptInfo {});
(x)(BkptInfo {
throw: throw,
});
return;
}
}
@ -128,6 +130,14 @@ pub fn call_protected<T>(f: impl FnOnce() -> T) -> Result<T, CallProtError> {
}
}
pub unsafe extern "C" fn throw() -> ! {
let jmp_buf = SETJMP_BUFFER.with(|buf| buf.get());
if *jmp_buf == [0; SETJMP_BUFFER_LEN] {
::std::process::abort();
}
longjmp(jmp_buf as *mut ::nix::libc::c_void, 0xffff);
}
/// Unwinds to last protected_call.
pub unsafe fn do_unwind(signum: i32, siginfo: *const c_void, ucontext: *const c_void) -> ! {
// Since do_unwind is only expected to get called from WebAssembly code which doesn't hold any host resources (locks etc.)