Add partial support for -fwasm-exceptions in Asyncify (#5343) #5475

caiiiycuk · 2023-02-02T06:57:13Z

You can download binaries of wasm-opt that support fwasm-exceptions and Asyncify here.
Replace emsdk/upstream/bin/wasm-opt with downloaded version and then you can use -fwasm-exceptions with Asyncify.

--
Hi. This PR does not do lowering wasm exceptions to MVP as suggested in #5343, so I need to explain situation:

I am trying to port a dosbox/dosbox-x core as is to WebAssembly. The dosbox core is syncrhnous, it runs emulation in forever while loop, events are processed inside this loop. To make this loop asynchrous I use Asyncify, however the unmodified core uses exceptions in certain situations.

Asyncify does not support exceptions, this PR should change the situation in some cases including dosbox/x case.
The main idea of emulation loop is follow:

void emulation() {
  do {
    em_sleep(); // <-- **START_UNWIND**
    try {
      int ret = cpudecode();
      // rest logic
    } catch (PageFault&) {
      // load failed page 
    } catch (Some&) {
      // do some 
    }
  } while (ret);
}

int cpudecode() {
  // some logic that also can call **emulation** recursively
}

The catch blocks is used to recover core, or to jump out from some of deep cpudecode calls. There is no situation when emulation loop is called when catch block somewhere in stack:

void some() {
  while () {
    try {
      ...
      some(); // can call start_unwind
    } catch () {
      // never calls to start_unwind
    }
  }
}

This also means that catch block can't change the state, and so only try block can. But on other hand try block it self should works fine with current asyncify code. When we are doing rewind we are only visiting try blocks and never catch blocks, so it work out of the box.

For such type of synchronous code we can add exceptions support, we need only verify that unwind didn't start from a catch block (when catch is not in stack). We can validate this requirment and throw exception if it breaks or ignore the unwind call.

This is very small overhead and simple solution to bring exceptions support in Asyncify, more over for some codebases it should be simple to rewrite the synchronous loop to not call unwind from a catch blocks.

This PR is tested on dosbox-x, it works fine.
emscripten-discuss initial context

There is one thing in impelementation that probably is not correct:

            auto decIf = builder->makeIf(
              br->condition,
              builder->makeSequence(builder->makeDec(amount), br),
              br->value);
            br->condition = nullptr;
            replaceCurrent(decIf);

I have a global variable that I need to decrease on some amount just before br_if instruction,
but only when condition is true. I tried lot of other variants but no luck:

Adding new instruction into condition body:

            Index newLocal = builder->addVar(func, br->condition->type);
            auto setLocal = builder->makeLocalSet(newLocal, br->condition);
            auto getLocal =
              builder->makeLocalGet(newLocal, br->condition->type);
            
            br->condition = builder->makeBlock(
              {setLocal,
               builder->makeIf(getLocal, builder->makeDec(amount)),
               getLocal},
              br->condition->type);

Result:

Assertion failed: (!resultUsed || curr->type != Type::none), function optimize, file Vacuum.cpp, line 95.

>    // resultUsed only makes sense when the type is concrete
>    assert(!resultUsed || curr->type != Type::none);  <-- **ASSERT**
>    // If we actually need the result, then we must not change anything.
>    // TODO: maybe there is something clever though?
>    if (resultUsed) {
>      return curr;
>    }

Just wrap the br_if with new block:

            replaceCurrent(builder->makeSequence(
              builder->makeIf(br->condition, builder->makeDec(amount)), br));

Result:

Assertion failed: (values.size() == 1), function getSingleValue, file wasm-interpreter.h, line 67.

>    if (curr->condition) {
>      Flow conditionFlow = visit(curr->condition);
>      if (conditionFlow.breaking()) {
>        return conditionFlow;
>      }
>      condition = conditionFlow.getSingleValue().getInteger() != 0; // <-- **ASSERT**

Just wrap the br_if but save condition result into local var like in 1. Results is sames as in 2.
Completely replace br_if with if and br:

            auto decIf = builder->makeIf(
              br->condition,
              builder->makeSequence(builder->makeDec(amount), br));
            br->condition = nullptr;
            replaceCurrent(decIf);

Results:

Works fine on small wasm files
On big wasm file have this error:

[wasm-validator error in function CDROM_Interface_Image::LoadCueSheet\28char*\29] unexpected true: if without else must not return a value in body, on

>(if
> (i32.and
>  (i32.load8_u offset=16
>   (i32.add
>    (local.get $8)
>    (i32.load
>     (i32.sub
>      (i32.load
>       (local.get $8)
>      )
>      (i32.const 12)
>     )
>    )
>   )
>  )
>  (i32.const 5)
> )
> (block (result i32)
>  (global.set $__asyncify_catch_counter
>   (i32.sub
>    (global.get $__asyncify_catch_counter)
>    (i32.const 2)
>   )
>  )
>  (br $label$1
>   (i32.const 0)
>  )
> )
>)

OR

[wasm-validator error in function CDROM_Interface_Image::LoadCueSheet\28char*\29] unexpected false: can only drop a valid value, on

>(drop
> (if
>  (i32.and
>   (i32.load8_u offset=16
>    (i32.add
>     (local.get $8)
>     (i32.load
>      (i32.sub
>       (i32.load
>        (local.get $8)
>       )
>       (i32.const 12)
>      )
>     )
>    )
>   )
>   (i32.const 5)
>  )
>  (block (result i32)
>   (global.set $__asyncify_catch_counter
>    (i32.sub
>     (global.get $__asyncify_catch_counter)
>     (i32.const 2)
>    )
>   )
>   (br $label$1
>    (i32.const 0)
>   )
>  )
> )
>)

I thinking to not use replaceCurrent, find the parent block of br_if and insert builder->makeDec just before br, but seems even more cumbersome cause parent block can be Block, Loop, If, Drop, Try, etc. I don't have straightforward algorithm in my mind.

Thanks!

kripken

Interesting idea! I think this makes sense to do.

src/passes/Asyncify.cpp

caiiiycuk · 2023-02-08T18:40:45Z

Refactored, now I change only top-level catch blocks. Also added lit tests, for me seems correct. Dosbox-x works fine.
Only here could be a problem:

// br_if case with condition and value

            Index newLocal = builder->addVar(func, br->value->type);
            auto setLocal = builder->makeLocalSet(newLocal, br->value);
            auto getLocal = builder->makeLocalGet(newLocal, br->value->type);
            auto condition = br->condition;
            br->condition = nullptr;
            br->value = getLocal;
            auto decIf =
              builder->makeIf(condition,
                              builder->makeSequence(builder->makeDec(), br),
                              getLocal);
            replaceCurrent(builder->makeSequence(setLocal, decIf));

Not sure how to deal if sideeffect will be in setLocal, currenlty it executes before condition....
@kripken please take a look

src/passes/Asyncify.cpp

allsey87 · 2023-06-15T07:14:38Z

@kripken is there anything preventing this PR from being merged?

caiiiycuk · 2023-06-15T09:05:42Z

I'm sorry, I want to finish this and add the changes suggested by @kripken, I'll try to find some time to finish it (not sure I can do it anytime soon). Btw I've used it many times and it works great in the case of js-dos.

allsey87 · 2023-06-15T09:47:43Z

Excellent work @caiiiycuk! I look forward to seeing this merged!

allsey87 · 2023-06-15T14:38:01Z

@caiiiycuk I am currently testing your branch and have updated the binaries in emsdk/upstream/bin with those from the build. However I am getting some errors when I try to build my test program:

em++: warning: ASYNCIFY=1 is not compatible with -fwasm-exceptions. Parts of the program that mix ASYNCIFY and exceptions will not compile. [-Wemcc]
error: DISABLE_EXCEPTION_THROWING was set (likely due to -fno-exceptions), which means no C++ exception throwing support code is linked in, but exception catching code appears. Either do not set DISABLE_EXCEPTION_THROWING (if you do want exception throwing) or compile all source files with -fno-except (so that no exceptions support code is required); also make sure DISABLE_EXCEPTION_CATCHING is set to the right value - if you want exceptions, it should be off, and vice versa.

I think the warning is fine. But I am confused as to why DISABLE_EXCEPTION_THROWING is being set. I have added -fwasm-exceptions to both the linker flags and compiler flags (both to the C++ and C flags (I guess the latter is not necessary)). Do have any suggestions on how to fix this? I am using Emscripten 3.1.32.

caiiiycuk · 2023-06-15T14:57:41Z

I just it like this

            -fwasm-exceptions
            "-sASYNCIFY=1"
            "-sASYNCIFY_IMPORTS=['syncSleep']"
            "-sASYNCIFY_WHITELIST=@${TARGETS_DIR}/dosbox-x-asyncify.txt"

Did you check, maybe you set flag -fno-exceptions somewhere.
Also you need to set -fwasm-exceptions both on compile and linking stages.

caiiiycuk · 2023-06-23T20:46:28Z

@kripken I apologize for the delay. I have made all the changes you requested. Please take a look and let me know if there's anything else to do.

caiiiycuk · 2023-07-09T21:38:21Z

@kripken friendly ping

allsey87 · 2023-07-26T17:53:16Z

I have been using this for several weeks now and I haven't found any issues yet! Excellent work @caiiiycuk!

caiiiycuk · 2023-07-26T19:57:28Z

@allsey87 thanks, great to know

kripken · 2023-07-26T20:04:34Z

@caiiiycuk Sorry, I've been meaning to get to this but have been busy. Thanks for updating this!

There has recently been a suggestion to make some changes in how wasm exceptions works in the spec, see WebAssembly/exception-handling#280 - I have no idea what will happen there, but it might mean that if we land this we'd need to then refactor it significantly. On the positive side, they do mention it is a goal to make things like Asyncify easier, so perhaps this will become simpler actually. Either way, though, I think we should wait on this PR to see what the spec changes are first, to avoid wasted work for all of us.

caiiiycuk · 2023-07-26T20:11:07Z

@kripken No worries, all good. At least it works for my case. :)

fs-eire · 2024-01-20T07:55:20Z

Is there any chance that we can merge this? JSPI still need to take some time...

kripken · 2024-01-22T17:53:03Z

The new wasm EH proposal I mentioned above is in the process of being implemented now. The main component is this:

binaryen/src/wasm.h

Lines 1473 to 1474 in 3049fb8

    
           // 'try_table' from the new EH proposal 
        
           class TryTable : public SpecificExpression<Expression::TryTableId> {

If we want to land this PR then targeting that would make sense, as the old EH will be removed. However, the new wasm EH is not done yet (e.g. parts of the optimizer don't work on it) so it's too early for that, I'm afraid.

curiousdannii · 2025-11-03T08:13:38Z

Yeah I haven't been doing anything tricky.

The one catch I see is that indirect calls typically need to be instrumented for Asyncify, and Rust seems to use them a lot. It's very plausible that the Rust exceptions code would use indirect calls. I don't know whether that use would be covered by this PR or not.

You can opt specific functions out of Asyncify instrumentation (asyncify_remove), but it's hard to know when it's safe to. My asyncify_advise log has over 1500 lines.

workingjubilee · 2025-11-03T08:15:19Z

Well. Our formatting code typically goes through a vtable for size reasons, which I believe winds up with an indirect call, and while if memory serves the unwinding itself doesn't involve formatting, the panic messaging sure does.

workingjubilee · 2025-11-03T08:24:29Z

It is a tad too late in the day for me to explain in detail what the difference is between "starting a panic", "running the panic handler" (which usually is the thing that does the message printing, if I am not somehow misremembering everything...), and "unwinding (due to a panic)" but these are technically all their own little thing and it's not entirely clear to me what ASYNCIFY needs and doesn't need, here.

This is why "inscrutable binary editing with unclear parameters but it works, probably" is usually something to which we say, "Have fun with that!" Except that it is apparently core to some usage of the emscripten target, and, well, if we don't support what the emsdk can do, then what exactly does define the emscripten target for us? That is a philosophical question which may be useful to address one day but also may be nice to kick down the road a bit.

caiiiycuk · 2025-11-03T08:46:48Z

Yes, sometimes it’s really hard to understand all the technical details, especially when you don’t fully know the supporting technology.

If we simplify things a lot, code like this is considered normal:

while (true) {
    try {
       // ...
       asyncify_sleep(10);
    } catch (...) {
       // anything
    }
}

while code like this is not supported:

while (true) {
    try {
       // ...
       asyncify_sleep(10);
    } catch (...) {
       // anything
       asyncify_sleep(10); // <--- not supported
    }
}

I believe this approach will succeed because code is typically written like in block 1 — a catch block is used to handle an exception and then return the execution flow to a valid, normal state.

At least in the case of incorrect code organization, we’ll see a clear, understandable error indicating that asyncify_sleep was called in the wrong place.

Overall, if we look only at Emscripten, I don’t see any negative side effects from merging this PR. I’ve been maintaining it for about two years without major issues.

src/passes/Asyncify.cpp

kripken · 2025-11-03T17:47:07Z

src/passes/Asyncify.cpp

 };

+// Add catch block counters to verify that unwind is not called from catch
+// block.


Could we depend on the IR structure to find if we are inside a catch? See ExpressionStackWalker which maintains a stack of parents. findBreakTarget() there shows an example of scanning the parents.

Cool, I will try to adopt this.

@kripken

I have been thinking about this task, and so far I do not understand how to make it more efficient. We do not actually need a parent stack, because we do not care which nested catch block we are currently in. Essentially, I only want to know whether we are inside a catch or not. In the current code, we have a counter for this, which is effectively just a boolean flag. If I am not mistaken, it is always either 0 or 1, which means we could add additional assert that checks it falls within that range.

The core problem is that at compile time we cannot determine whether a function that changes the Asyncify state called inside a catch or not. More precisely, we could determine that if there were no virtual function calls. I have not yet found a way to work around this at compile time, which is why a counter is used.

I still do not quite understand how to apply a parent stack here. I could maintain such a stack at runtime, but that seems worse than just using an integer counter.

Or is the idea to keep the counter, but update it using the information obtained from ExpressionStackWalker?

Oh, obviously it can be greater than 1, but at least it cannot be less than 0.

The core problem is that at compile time we cannot determine whether a function that changes the Asyncify state called inside a catch or not.

We may not know if there is a catch further up, at runtime, but we will reach it when we unwind, I think? So the compile-time knowledge seems enough. Here is what I mean:

function foo() { try { .. } catch (e) { bar(); // after call to bar } } function bar() { importThatPauses(); }

Say we reach that call to bar, then it calls the import that pauses. Inside bar, we don't know that we are inside a catch from earlier. But after bar unwinds normally, we reach "after call to bar" and we can have a static assert there about not unwinding.

That is, each catch block can, statically, get added checks to not unwind, after each possibly-unwinding operation there?

(and iirc we already have a way to add checks for "should not be unwinding here", so I hope this is not hard to add)

Ahh, sounds correct. But then we cannot support --pass-arg=asyncify-ignore-unwind-from-catch if I understood correctly. But we can add those static checks in case if this flag is not passed.

I see now, thanks. So that option makes it necessary to know immediately if we are nested under a catch...

Co-authored-by: Alon Zakai <[email protected]>

curiousdannii · 2025-11-03T20:18:12Z

At least in the case of incorrect code organization, we’ll see a clear, understandable error indicating that asyncify_sleep was called in the wrong place.

At compile time or run time?

caiiiycuk · 2025-11-03T20:20:33Z

At least in the case of incorrect code organization, we’ll see a clear, understandable error indicating that asyncify_sleep was called in the wrong place.

At compile time or run time?

At runtime. However, you can also avoid this by using a special flag that ignores asyncify_sleep in incorrect situations — though the app might get stuck there in forever loop.

curiousdannii · 2025-11-03T21:16:10Z

Specifically asyncify_sleep or all async functions?

The other big question is if you think async in catch is a fundamental incompatibility, or instead a big difficulty that might be supportable with a lot more work?

fs-eire · 2025-11-03T21:20:40Z

Is it possible to use any compile time analysis tool or runtime check to tell whether any rewind/unwind happening inside a catch block?

caiiiycuk · 2025-11-04T19:39:31Z

Specifically asyncify_sleep or all async functions?

The other big question is if you think async in catch is a fundamental incompatibility, or instead a big difficulty that might be supportable with a lot more work?

Any async function — they’re all implemented the same way. But I don’t know if it’s even possible to make Asyncify work inside a catch block. There’s also an attempt here: #5143 — maybe if that idea is developed further, something could come out of it. Still, I think Asyncify is rarely used in practice, and Asyncify inside a catch block is an even rarer case. It seems easier to just rewrite the code to avoid the need for infinite loops inside catch blocks altogether.

Is it possible to use any compile time analysis tool or runtime check to tell whether any rewind/unwind happening inside a catch block?

Yes, to some extent — it’s similar to automatically generating a list of functions that modify asyncify_state. But if there’s a virtual function call inside (through a pointer), then you really can’t be sure anymore.

caiiiycuk · 2025-11-04T19:42:01Z

Is it possible to use any compile time analysis tool or runtime check to tell whether any rewind/unwind happening inside a catch block?

Potentially, it’s possible to implement a check with two outcomes:

100% no catch block calls an async function (ALL GOOD)
Some functions that modify the asyncify state might be called from catch + list of this functions.

kripken · 2025-11-05T17:19:12Z

src/passes/Asyncify.cpp

+// Add catch block counters to verify that unwinding is not done from catch
+// block.


Suggested change

// Add catch block counters to verify that unwinding is not done from catch

// block.

// Add catch block counters to verify that unwinding is not done from inside

// a catch block. Note that we need to know if we are nested under a catch

// immediately - we can't depend on unwinding noticing it when we reach

// that parent catch - because of the option asyncify-ignore-unwind-from-catch.

kripken · 2025-11-05T17:21:57Z

src/passes/Asyncify.cpp

+    // - break outside top-level/nested catch        0 (ignored)
+    //
+    // - exiting from top-level catch               -1
+    // - exiting from nested catch                   0 (ignored)


Unfortunately, detecting an exit from a catch is not as simple as this. You would also need to handle br_on and return_call, off the top of my head.

We could in theory say this feature doesn't support GC or tail calls, but imagine this is linked with a module using those features, and then inlining happens, so it seems worrying.

How important is asyncify-ignore-unwind-from-catch? Without that, we could use the more static approach I mentioned before.

(Oh, and also try_table - people could mix exnref EH and non-exnref EH.)

Personally I don't use asyncify-ignore-unwind-from-catch, I provided it for completeness, and because it is easy. So, I think can remove it, but can't guess if it can be used by someone else. Also I think it is easy to fix in code.

I mean if needed devs can fix code to support something like ignore this asyncify_sleep

Ok, I don't think anyone else mentioned a need for that option, so maybe it is best to remove it. Can maybe wait a bit to see if anyone on this PR responds.

workingjubilee · 2025-11-06T23:00:55Z

while code like this is not supported:
while (true) {
    try {
       // ...
       asyncify_sleep(10);
    } catch (...) {
       // anything
       asyncify_sleep(10); // <--- not supported
    }
}
I believe this approach will succeed because code is typically written like in block 1 — a catch block is used to handle an exception and then return the execution flow to a valid, normal state.

Hmm, that may be slightly easier to run into than I thought! Though I still wouldn't expect it to happen via the Rust side because of how Rust code uses exceptions only, well, exceptionally.

@curiousdannii It may be possible to mitigate the indirection problem if necessary... or at least help you with the ASYNCIFY_REMOVE list... so please feel free to ask us about this if you wind up having troubles after updating to an emcc with this branch in it. Though not in this thread, obviously, I mean a new issue or asking on Zulip or such.

curiousdannii · 2025-11-07T01:19:22Z

Even with JS exceptions I need to work out what I can asyncify_remove. Here's what I'm working with. Wish me luck 😂
glulxe-log.txt

Edit: great news: I've discovered that at least one of the apps I build in my project can go back to using ASYNCIFY_IGNORE_INDIRECT. I'd disabled it when I first switched to Rust. Possibly changing to panic=abort made the difference.

caiiiycuk · 2025-11-10T13:04:46Z

@kripken

Please take a look at the last two commits. I attempted to implement the following algorithm:

We iterate over all function calls.
We determine whether the call is made inside a catch block.
If it is, we insert a check after the call to ensure that ASYNCIFY_STATE is still NORMAL.

More details on point 2, since I am not entirely sure the current implementation covers all cases—mainly because I may not be aware of every detail.

I use ExpressionStackWalker to locate the nearest parent Try block. Once it is found, I need to determine whether the call occurs inside the try body or inside one of the catch blocks. In practice, it is enough to check whether the current instruction belongs to the try.body. To do this, I simply take the first child of the Try block from the stack, and if that child is try->body, then the call is considered safe; otherwise, I insert the corresponding check.

I tested this code with js-dos, and so far I haven’t encountered any issues. However, I am still not completely confident in it overall.

kripken

Looks pretty good! I don't see anything incorrect.

src/passes/Asyncify.cpp

kripken · 2025-11-10T21:36:28Z

src/passes/Asyncify.cpp

+    return std::make_unique<AsyncifyAssertUnwindCorrectness>(analyzer, module);
+  }
+
+  bool isFunctionParallel() override { return true; }


As a convention we prefer this at the top of the class, before all other internals.

kripken · 2025-11-10T21:41:51Z

src/passes/Asyncify.cpp

+      }
+
+      void visitCall(Call* curr) {
+        assert(!expressionStack.empty());


A return_call (curr->isReturn) can be ignored here: It returns first, leaving the Catch, before calling.

kripken · 2025-11-10T21:42:49Z

src/passes/Asyncify.cpp

+  bool isFunctionParallel() override { return true; }
+
+  void runOnFunction(Module*, Function* function) override {
+    auto builder = std::make_unique<Builder>(*module);


Builders are very cheap to construct - please create one in replaceCallWithCheck, as needed, which would be simpler.

kripken · 2025-11-10T21:43:55Z

src/passes/Asyncify.cpp

+  void addFunctions(Module* module, bool asserts) {
    Builder builder(*module);
    auto makeFunction = [&](Name name, bool setData, State state) {
+      auto* body = builder.makeBlock();


Why move this?

kripken · 2025-11-10T21:44:14Z

src/passes/Asyncify.cpp

  }

-  void addFunctions(Module* module) {
+  void addFunctions(Module* module, bool asserts) {


New param seems unused?

kripken · 2025-11-10T21:45:24Z

src/passes/Asyncify.cpp

      PassRunner runner(module);
-      runner.add(std::make_unique<AsyncifyAssertInNonInstrumented>(
-        &analyzer, pointerType, asyncifyMemory));
+      if (asserts) {


This is already inside an if (asserts), line 1860

Co-authored-by: Alon Zakai <[email protected]>

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lbguilherme mentioned this pull request Feb 28, 2023

WebAssembly Exceptions crystal-lang/crystal#13130

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caiiiycuk changed the title ~~Add partial support for -fwasm-exceptions in Asyncify (#5343)~~ WIP: Add partial support for -fwasm-exceptions in Asyncify (#5343) Jun 22, 2023

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caiiiycuk changed the title ~~WIP: Add partial support for -fwasm-exceptions in Asyncify (#5343)~~ Add partial support for -fwasm-exceptions in Asyncify (#5343) Jun 22, 2023

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allsey87 mentioned this pull request Jun 23, 2023

Support Asyncify + Try-Catch [Can't build web-gphoto2 with -fwasm-exceptions instead of -fexceptions] #4470

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Update src/passes/Asyncify.cpp

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Co-authored-by: Alon Zakai <[email protected]>

Update src/passes/Asyncify.cpp

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Update src/passes/Asyncify.cpp

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Introduce AsyncifyAssertUnwindCorrectness

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Update src/passes/Asyncify.cpp

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Co-authored-by: Alon Zakai <[email protected]>

Update src/passes/Asyncify.cpp

fc47f68

Co-authored-by: Alon Zakai <[email protected]>

Update src/passes/Asyncify.cpp

8d37605

Co-authored-by: Alon Zakai <[email protected]>

Update src/passes/Asyncify.cpp

4175a77

Co-authored-by: Alon Zakai <[email protected]>

Update src/passes/Asyncify.cpp

7fd9579

Co-authored-by: Alon Zakai <[email protected]>

Update src/passes/Asyncify.cpp

af58be1

Co-authored-by: Alon Zakai <[email protected]>

Update src/passes/Asyncify.cpp

e9b062f

Co-authored-by: Alon Zakai <[email protected]>

		// Add catch block counters to verify that unwinding is not done from catch
		// block.

-// Add catch block counters to verify that unwinding is not done from catch
-// block.
+// Add catch block counters to verify that unwinding is not done from inside
+// a catch block. Note that we need to know if we are nested under a catch
+// immediately - we can't depend on unwinding noticing it when we reach
+// that parent catch - because of the option asyncify-ignore-unwind-from-catch.

Add partial support for -fwasm-exceptions in Asyncify (#5343) #5475

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Add partial support for -fwasm-exceptions in Asyncify (#5343) #5475

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