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wasm: add recover support

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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.
This commit is contained in:
Ayke van Laethem
2024-08-03 09:56:19 +02:00
parent 2f7952ff29
commit 89ffb47a0c
28 changed files with 885 additions and 397 deletions
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compiler/testdata/pointer.ll
Vendored
+11 -12
View File
@@ -6,45 +6,44 @@ target triple = "wasm32-unknown-wasi"
; Function Attrs: allockind("alloc,zeroed") allocsize(0)
declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
; Function Attrs: nounwind
declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
; Function Attrs: nounwind
define hidden void @main.init(ptr %context) unnamed_addr #2 {
define hidden void @main.init(ptr %context) unnamed_addr #1 {
entry:
ret void
}
; Function Attrs: nounwind
define hidden [0 x i32] @main.pointerDerefZero(ptr %x, ptr %context) unnamed_addr #2 {
define hidden [0 x i32] @main.pointerDerefZero(ptr %x, ptr %context) unnamed_addr #1 {
entry:
ret [0 x i32] zeroinitializer
}
; Function Attrs: nounwind
define hidden ptr @main.pointerCastFromUnsafe(ptr %x, ptr %context) unnamed_addr #2 {
define hidden ptr @main.pointerCastFromUnsafe(ptr %x, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef)
ret ptr %x
}
; Function Attrs: nounwind
define hidden ptr @main.pointerCastToUnsafe(ptr dereferenceable_or_null(4) %x, ptr %context) unnamed_addr #2 {
define hidden ptr @main.pointerCastToUnsafe(ptr dereferenceable_or_null(4) %x, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef)
ret ptr %x
}
; Function Attrs: nounwind
define hidden ptr @main.pointerCastToUnsafeNoop(ptr dereferenceable_or_null(1) %x, ptr %context) unnamed_addr #2 {
define hidden ptr @main.pointerCastToUnsafeNoop(ptr dereferenceable_or_null(1) %x, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %x, ptr nonnull %stackalloc, ptr undef)
ret ptr %x
}
attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
attributes #3 = { nounwind }
attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
attributes #1 = { nounwind "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" }