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.
105 lines
3.6 KiB
LLVM
105 lines
3.6 KiB
LLVM
; ModuleID = 'string.go'
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source_filename = "string.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._string = type { ptr, i32 }
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@"main$string" = internal unnamed_addr constant [3 x i8] c"foo", align 1
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; Function Attrs: allockind("alloc,zeroed") allocsize(0)
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declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
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; Function Attrs: nounwind
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declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
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; Function Attrs: nounwind
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define hidden void @main.init(ptr %context) unnamed_addr #1 {
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entry:
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ret void
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}
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; Function Attrs: nounwind
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define hidden %runtime._string @main.someString(ptr %context) unnamed_addr #1 {
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entry:
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ret %runtime._string { ptr @"main$string", i32 3 }
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}
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; Function Attrs: nounwind
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define hidden %runtime._string @main.zeroLengthString(ptr %context) unnamed_addr #1 {
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entry:
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ret %runtime._string zeroinitializer
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}
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; Function Attrs: nounwind
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define hidden i32 @main.stringLen(ptr %s.data, i32 %s.len, ptr %context) unnamed_addr #1 {
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entry:
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ret i32 %s.len
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}
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; Function Attrs: nounwind
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define hidden i8 @main.stringIndex(ptr %s.data, i32 %s.len, i32 %index, ptr %context) unnamed_addr #1 {
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entry:
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%.not = icmp ult i32 %index, %s.len
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br i1 %.not, label %lookup.next, label %lookup.throw
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lookup.next: ; preds = %entry
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%0 = getelementptr inbounds i8, ptr %s.data, i32 %index
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%1 = load i8, ptr %0, align 1
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ret i8 %1
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lookup.throw: ; preds = %entry
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call void @runtime.lookupPanic(ptr undef) #3
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unreachable
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}
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declare void @runtime.lookupPanic(ptr) #2
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; Function Attrs: nounwind
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define hidden i1 @main.stringCompareEqual(ptr %s1.data, i32 %s1.len, ptr %s2.data, i32 %s2.len, ptr %context) unnamed_addr #1 {
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entry:
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%0 = call i1 @runtime.stringEqual(ptr %s1.data, i32 %s1.len, ptr %s2.data, i32 %s2.len, ptr undef) #3
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ret i1 %0
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}
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declare i1 @runtime.stringEqual(ptr, i32, ptr, i32, ptr) #2
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; Function Attrs: nounwind
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define hidden i1 @main.stringCompareUnequal(ptr %s1.data, i32 %s1.len, ptr %s2.data, i32 %s2.len, ptr %context) unnamed_addr #1 {
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entry:
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%0 = call i1 @runtime.stringEqual(ptr %s1.data, i32 %s1.len, ptr %s2.data, i32 %s2.len, ptr undef) #3
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%1 = xor i1 %0, true
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ret i1 %1
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}
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; Function Attrs: nounwind
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define hidden i1 @main.stringCompareLarger(ptr %s1.data, i32 %s1.len, ptr %s2.data, i32 %s2.len, ptr %context) unnamed_addr #1 {
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entry:
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%0 = call i1 @runtime.stringLess(ptr %s2.data, i32 %s2.len, ptr %s1.data, i32 %s1.len, ptr undef) #3
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ret i1 %0
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}
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declare i1 @runtime.stringLess(ptr, i32, ptr, i32, ptr) #2
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; Function Attrs: nounwind
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define hidden i8 @main.stringLookup(ptr %s.data, i32 %s.len, i8 %x, ptr %context) unnamed_addr #1 {
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entry:
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%0 = zext i8 %x to i32
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%.not = icmp ult i32 %0, %s.len
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br i1 %.not, label %lookup.next, label %lookup.throw
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lookup.next: ; preds = %entry
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%1 = getelementptr inbounds i8, ptr %s.data, i32 %0
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%2 = load i8, ptr %1, align 1
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ret i8 %2
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lookup.throw: ; preds = %entry
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call void @runtime.lookupPanic(ptr undef) #3
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unreachable
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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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