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Add preliminary support for throwing and catching uncatchable exceptions.

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Additional info:
- WebAssembly "traps" are uncatchable, but are still caught by the trampoline caller.
This commit is contained in:
Lachlan Sneff
2019-03-02 12:57:35 -08:00
parent 5760f6006a
commit 9a90689b93
5 changed files with 120 additions and 11 deletions
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18
lib/llvm-backend/src/backend.rs
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@ -71,6 +71,16 @@ extern "C" {
) -> LLVMResult;
fn module_delete(module: *mut LLVMModule);
fn get_func_symbol(module: *mut LLVMModule, name: *const c_char) -> *const vm::Func;
fn throw_unreachable_exception();
fn throw_incorrect_call_indirect_signature();
// invoke_trampoline(trampoline_t trampoline, void* ctx, void* func, void* params, void* results)
fn invoke_trampoline(
trampoline: unsafe extern "C" fn(*mut vm::Ctx, *const vm::Func, *const u64, *mut u64),
vmctx_ptr: *mut vm::Ctx,
func_ptr: *const vm::Func,
params: *const u64,
results: *mut u64,
);
}
fn get_callbacks() -> Callbacks {
@ -162,6 +172,11 @@ fn get_callbacks() -> Callbacks {
fn_name!("vm.memory.size.dynamic.local") => vmcalls::local_dynamic_memory_size as _,
fn_name!("vm.memory.grow.static.local") => vmcalls::local_static_memory_grow as _,
fn_name!("vm.memory.size.static.local") => vmcalls::local_static_memory_size as _,
fn_name!("vm.exception.throw.unreachable") => throw_unreachable_exception as _,
fn_name!("vm.exception.throw.incorrect-call_indirect_signature") => {
throw_incorrect_call_indirect_signature as _
}
_ => ptr::null(),
}
}
@ -343,7 +358,8 @@ impl ProtectedCaller for LLVMProtectedCaller {
// Here we go.
unsafe {
trampoline(
invoke_trampoline(
trampoline,
vmctx_ptr,
func_ptr,
param_vec.as_ptr(),