mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-03 10:37:46 +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.
116 lines
5.6 KiB
LLVM
116 lines
5.6 KiB
LLVM
; ModuleID = 'channel.go'
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source_filename = "channel.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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%runtime.channelBlockedList = type { ptr, ptr, ptr, { ptr, i32, i32 } }
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%runtime.chanSelectState = type { ptr, ptr }
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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.chanIntSend(ptr dereferenceable_or_null(32) %ch, ptr %context) unnamed_addr #1 {
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entry:
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%chan.blockedList = alloca %runtime.channelBlockedList, align 8
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%chan.value = alloca i32, align 4
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call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %chan.value)
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store i32 3, ptr %chan.value, align 4
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call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %chan.blockedList)
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call void @runtime.chanSend(ptr %ch, ptr nonnull %chan.value, ptr nonnull %chan.blockedList, ptr undef) #4
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call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %chan.blockedList)
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call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %chan.value)
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ret void
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}
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; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2
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declare void @runtime.chanSend(ptr dereferenceable_or_null(32), ptr, ptr dereferenceable_or_null(24), ptr) #3
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; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2
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; Function Attrs: nounwind
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define hidden void @main.chanIntRecv(ptr dereferenceable_or_null(32) %ch, ptr %context) unnamed_addr #1 {
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entry:
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%chan.blockedList = alloca %runtime.channelBlockedList, align 8
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%chan.value = alloca i32, align 4
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call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %chan.value)
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call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %chan.blockedList)
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%0 = call i1 @runtime.chanRecv(ptr %ch, ptr nonnull %chan.value, ptr nonnull %chan.blockedList, ptr undef) #4
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call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %chan.value)
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call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %chan.blockedList)
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ret void
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}
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declare i1 @runtime.chanRecv(ptr dereferenceable_or_null(32), ptr, ptr dereferenceable_or_null(24), ptr) #3
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; Function Attrs: nounwind
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define hidden void @main.chanZeroSend(ptr dereferenceable_or_null(32) %ch, ptr %context) unnamed_addr #1 {
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entry:
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%chan.blockedList = alloca %runtime.channelBlockedList, align 8
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call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %chan.blockedList)
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call void @runtime.chanSend(ptr %ch, ptr null, ptr nonnull %chan.blockedList, ptr undef) #4
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call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %chan.blockedList)
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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.chanZeroRecv(ptr dereferenceable_or_null(32) %ch, ptr %context) unnamed_addr #1 {
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entry:
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%chan.blockedList = alloca %runtime.channelBlockedList, align 8
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call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %chan.blockedList)
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%0 = call i1 @runtime.chanRecv(ptr %ch, ptr null, ptr nonnull %chan.blockedList, ptr undef) #4
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call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %chan.blockedList)
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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.selectZeroRecv(ptr dereferenceable_or_null(32) %ch1, ptr dereferenceable_or_null(32) %ch2, ptr %context) unnamed_addr #1 {
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entry:
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%select.states.alloca = alloca [2 x %runtime.chanSelectState], align 8
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%select.send.value = alloca i32, align 4
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store i32 1, ptr %select.send.value, align 4
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call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %select.states.alloca)
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store ptr %ch1, ptr %select.states.alloca, align 4
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%select.states.alloca.repack1 = getelementptr inbounds %runtime.chanSelectState, ptr %select.states.alloca, i32 0, i32 1
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store ptr %select.send.value, ptr %select.states.alloca.repack1, align 4
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%0 = getelementptr inbounds [2 x %runtime.chanSelectState], ptr %select.states.alloca, i32 0, i32 1
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store ptr %ch2, ptr %0, align 4
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%.repack3 = getelementptr inbounds [2 x %runtime.chanSelectState], ptr %select.states.alloca, i32 0, i32 1, i32 1
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store ptr null, ptr %.repack3, align 4
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%select.result = call { i32, i1 } @runtime.tryChanSelect(ptr undef, ptr nonnull %select.states.alloca, i32 2, i32 2, ptr undef) #4
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call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %select.states.alloca)
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%1 = extractvalue { i32, i1 } %select.result, 0
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%2 = icmp eq i32 %1, 0
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br i1 %2, label %select.done, label %select.next
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select.done: ; preds = %select.body, %select.next, %entry
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ret void
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select.next: ; preds = %entry
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%3 = icmp eq i32 %1, 1
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br i1 %3, label %select.body, label %select.done
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select.body: ; preds = %select.next
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br label %select.done
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}
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declare { i32, i1 } @runtime.tryChanSelect(ptr, ptr, i32, i32, ptr) #3
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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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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attributes #3 = { "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
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attributes #4 = { nounwind }
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