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https://github.com/tinygo-org/tinygo.git
synced 2026-08-03 02:27:48 +00:00
Ayke van Laethem
89ffb47a0c
Add unwinding and recover support for wasm using WebAssembly exception
handling. This still has a few gotchas:
* Many WASI systems don't support exception handling yet.
For example, see:
https://github.com/bytecodealliance/wasmtime/issues/2049
* Asyncify doesn't support wasm exception handling:
https://github.com/WebAssembly/binaryen/issues/4470
This means it's not possible to use goroutines together with
panic/recover.
* The current way that exceptions are implemented pretend to be C++
exceptions, but work slightly differently. If C++ code is called
(for example through CGo) that raises an exception, that exception
will be eaten by TinyGo and not be propagated. This is fixable, it
just hasn't been implemented (because we don't actually support C++
right now).
I hope that these issues will be resolved over time. At least for now,
people who need `recover()` have a way to use it.
52 lines
1.8 KiB
LLVM
52 lines
1.8 KiB
LLVM
; ModuleID = 'func.go'
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source_filename = "func.go"
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target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
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target triple = "wasm32-unknown-wasi"
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; Function Attrs: allockind("alloc,zeroed") allocsize(0)
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declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
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; Function Attrs: nounwind
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declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
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; Function Attrs: nounwind
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define hidden void @main.init(ptr %context) unnamed_addr #1 {
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entry:
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @main.foo(ptr %callback.context, ptr %callback.funcptr, ptr %context) unnamed_addr #1 {
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entry:
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%0 = icmp eq ptr %callback.funcptr, null
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br i1 %0, label %fpcall.throw, label %fpcall.next
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fpcall.next: ; preds = %entry
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call void %callback.funcptr(i32 3, ptr %callback.context) #3
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ret void
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fpcall.throw: ; preds = %entry
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call void @runtime.nilPanic(ptr undef) #3
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unreachable
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}
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declare void @runtime.nilPanic(ptr) #2
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; Function Attrs: nounwind
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define hidden void @main.bar(ptr %context) unnamed_addr #1 {
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entry:
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call void @main.foo(ptr undef, ptr nonnull @main.someFunc, ptr undef)
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @main.someFunc(i32 %arg0, ptr %context) unnamed_addr #1 {
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entry:
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ret void
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}
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attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
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attributes #1 = { nounwind "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
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attributes #2 = { "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
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attributes #3 = { nounwind }
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