wasmer_vm/libcalls/eh/
mod.rs

1// Part of the logic, here, is borrowed as-is from rust's stdlib.
2
3use crate::{InternalStoreHandle, VMContext, VMExceptionObj};
4
5mod dwarf;
6
7cfg_if::cfg_if! {
8    if #[cfg(any(target_env = "msvc", target_family = "wasm"))] {
9        /// The implementation of Wasmer's personality function.
10        ///
11        /// # Safety
12        ///
13        /// Performs libunwind unwinding magic.
14        pub unsafe fn wasmer_eh_personality() {
15            panic!()
16        }
17
18        /// The second stage of the personality function. See module level documentation
19        /// for an explanation of the exact procedure used during unwinding.
20        ///
21        /// # Safety
22        ///
23        /// Does pointer accesses, which must be valid.
24        pub unsafe fn wasmer_eh_personality2() {
25            panic!()
26        }
27
28        pub unsafe fn read_exnref(_exception: *mut std::ffi::c_void) -> u32 {
29            panic!()
30        }
31
32        /// # Safety
33        ///
34        /// Performs libunwind unwinding magic. Highly unsafe.
35        pub unsafe fn throw(_ctx: &crate::StoreObjects, _exnref: u32) -> ! {
36            panic!()
37        }
38
39        /// Given a pointer to a caught exception, return the exnref contained within.
40        ///
41        /// # Safety
42        ///
43        /// `exception` must be a pointer the platform-specific exception type; this is
44        /// `UwExceptionWrapper` for gcc.
45        pub unsafe fn delete_exception(_exception: *mut std::ffi::c_void) {
46            panic!()
47        }
48    } else if #[cfg(any(
49        all(target_family = "windows", target_env = "gnu"),
50        target_family = "unix",
51    ))] {
52        // gcc-like eh-personality mechanisms.
53        mod gcc;
54        pub use gcc::*;
55    } else {
56        // Targets that don't support unwinding.
57        // - os=none ("bare metal" targets)
58        // - os=uefi
59        // - os=espidf
60        // - os=hermit
61        // - nvptx64-nvidia-cuda
62        // - arch=avr
63    }
64}
65
66pub(crate) fn exn_obj_from_exnref(vmctx: *mut VMContext, exnref: u32) -> *mut VMExceptionObj {
67    let instance = unsafe { (*vmctx).instance_mut() };
68    let exnref = InternalStoreHandle::<VMExceptionObj>::from_index(exnref as usize).unwrap();
69    let exn = exnref.get_mut(instance.context_mut());
70    exn as *mut VMExceptionObj
71}
wasmer_vm/libcalls/eh/mod.rs

wasmer_vm/libcalls/eh/
mod.rs
