mirror of
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.
142 lines
7.3 KiB
LLVM
142 lines
7.3 KiB
LLVM
; ModuleID = 'zeromap.go'
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source_filename = "zeromap.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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%main.hasPadding = type { i1, i32, i1 }
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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: noinline nounwind
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define hidden i32 @main.testZeroGet(ptr dereferenceable_or_null(40) %m, i1 %s.b1, i32 %s.i, i1 %s.b2, ptr %context) unnamed_addr #2 {
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entry:
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%hashmap.key = alloca %main.hasPadding, align 8
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%hashmap.value = alloca i32, align 4
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%0 = insertvalue %main.hasPadding zeroinitializer, i1 %s.b1, 0
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%1 = insertvalue %main.hasPadding %0, i32 %s.i, 1
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%2 = insertvalue %main.hasPadding %1, i1 %s.b2, 2
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call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %hashmap.value)
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call void @llvm.lifetime.start.p0(i64 12, ptr nonnull %hashmap.key)
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store %main.hasPadding %2, ptr %hashmap.key, align 4
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%3 = getelementptr inbounds i8, ptr %hashmap.key, i32 1
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call void @runtime.memzero(ptr nonnull %3, i32 3, ptr undef) #5
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%4 = getelementptr inbounds i8, ptr %hashmap.key, i32 9
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call void @runtime.memzero(ptr nonnull %4, i32 3, ptr undef) #5
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%5 = call i1 @runtime.hashmapBinaryGet(ptr %m, ptr nonnull %hashmap.key, ptr nonnull %hashmap.value, i32 4, ptr undef) #5
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call void @llvm.lifetime.end.p0(i64 12, ptr nonnull %hashmap.key)
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%6 = load i32, ptr %hashmap.value, align 4
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call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %hashmap.value)
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ret i32 %6
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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) #3
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declare void @runtime.memzero(ptr, i32, ptr) #4
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declare i1 @runtime.hashmapBinaryGet(ptr dereferenceable_or_null(40), ptr, ptr, i32, ptr) #4
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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) #3
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; Function Attrs: noinline nounwind
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define hidden void @main.testZeroSet(ptr dereferenceable_or_null(40) %m, i1 %s.b1, i32 %s.i, i1 %s.b2, ptr %context) unnamed_addr #2 {
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entry:
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%hashmap.key = alloca %main.hasPadding, align 8
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%hashmap.value = alloca i32, align 4
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%0 = insertvalue %main.hasPadding zeroinitializer, i1 %s.b1, 0
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%1 = insertvalue %main.hasPadding %0, i32 %s.i, 1
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%2 = insertvalue %main.hasPadding %1, i1 %s.b2, 2
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call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %hashmap.value)
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store i32 5, ptr %hashmap.value, align 4
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call void @llvm.lifetime.start.p0(i64 12, ptr nonnull %hashmap.key)
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store %main.hasPadding %2, ptr %hashmap.key, align 4
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%3 = getelementptr inbounds i8, ptr %hashmap.key, i32 1
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call void @runtime.memzero(ptr nonnull %3, i32 3, ptr undef) #5
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%4 = getelementptr inbounds i8, ptr %hashmap.key, i32 9
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call void @runtime.memzero(ptr nonnull %4, i32 3, ptr undef) #5
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call void @runtime.hashmapBinarySet(ptr %m, ptr nonnull %hashmap.key, ptr nonnull %hashmap.value, ptr undef) #5
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call void @llvm.lifetime.end.p0(i64 12, ptr nonnull %hashmap.key)
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call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %hashmap.value)
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ret void
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}
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declare void @runtime.hashmapBinarySet(ptr dereferenceable_or_null(40), ptr, ptr, ptr) #4
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; Function Attrs: noinline nounwind
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define hidden i32 @main.testZeroArrayGet(ptr dereferenceable_or_null(40) %m, [2 x %main.hasPadding] %s, ptr %context) unnamed_addr #2 {
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entry:
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%hashmap.key = alloca [2 x %main.hasPadding], align 8
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%hashmap.value = alloca i32, align 4
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call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %hashmap.value)
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call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %hashmap.key)
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%s.elt = extractvalue [2 x %main.hasPadding] %s, 0
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store %main.hasPadding %s.elt, ptr %hashmap.key, align 4
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%hashmap.key.repack1 = getelementptr inbounds [2 x %main.hasPadding], ptr %hashmap.key, i32 0, i32 1
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%s.elt2 = extractvalue [2 x %main.hasPadding] %s, 1
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store %main.hasPadding %s.elt2, ptr %hashmap.key.repack1, align 4
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%0 = getelementptr inbounds i8, ptr %hashmap.key, i32 1
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call void @runtime.memzero(ptr nonnull %0, i32 3, ptr undef) #5
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%1 = getelementptr inbounds i8, ptr %hashmap.key, i32 9
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call void @runtime.memzero(ptr nonnull %1, i32 3, ptr undef) #5
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%2 = getelementptr inbounds i8, ptr %hashmap.key, i32 13
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call void @runtime.memzero(ptr nonnull %2, i32 3, ptr undef) #5
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%3 = getelementptr inbounds i8, ptr %hashmap.key, i32 21
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call void @runtime.memzero(ptr nonnull %3, i32 3, ptr undef) #5
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%4 = call i1 @runtime.hashmapBinaryGet(ptr %m, ptr nonnull %hashmap.key, ptr nonnull %hashmap.value, i32 4, ptr undef) #5
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call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %hashmap.key)
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%5 = load i32, ptr %hashmap.value, align 4
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call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %hashmap.value)
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ret i32 %5
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}
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; Function Attrs: noinline nounwind
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define hidden void @main.testZeroArraySet(ptr dereferenceable_or_null(40) %m, [2 x %main.hasPadding] %s, ptr %context) unnamed_addr #2 {
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entry:
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%hashmap.key = alloca [2 x %main.hasPadding], align 8
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%hashmap.value = alloca i32, align 4
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call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %hashmap.value)
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store i32 5, ptr %hashmap.value, align 4
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call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %hashmap.key)
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%s.elt = extractvalue [2 x %main.hasPadding] %s, 0
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store %main.hasPadding %s.elt, ptr %hashmap.key, align 4
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%hashmap.key.repack1 = getelementptr inbounds [2 x %main.hasPadding], ptr %hashmap.key, i32 0, i32 1
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%s.elt2 = extractvalue [2 x %main.hasPadding] %s, 1
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store %main.hasPadding %s.elt2, ptr %hashmap.key.repack1, align 4
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%0 = getelementptr inbounds i8, ptr %hashmap.key, i32 1
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call void @runtime.memzero(ptr nonnull %0, i32 3, ptr undef) #5
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%1 = getelementptr inbounds i8, ptr %hashmap.key, i32 9
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call void @runtime.memzero(ptr nonnull %1, i32 3, ptr undef) #5
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%2 = getelementptr inbounds i8, ptr %hashmap.key, i32 13
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call void @runtime.memzero(ptr nonnull %2, i32 3, ptr undef) #5
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%3 = getelementptr inbounds i8, ptr %hashmap.key, i32 21
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call void @runtime.memzero(ptr nonnull %3, i32 3, ptr undef) #5
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call void @runtime.hashmapBinarySet(ptr %m, ptr nonnull %hashmap.key, ptr nonnull %hashmap.value, ptr undef) #5
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call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %hashmap.key)
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call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %hashmap.value)
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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.main(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 = { noinline nounwind "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
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attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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attributes #4 = { "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
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attributes #5 = { nounwind }
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