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.
142 lines
7.9 KiB
LLVM
142 lines
7.9 KiB
LLVM
; ModuleID = 'interface.go'
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source_filename = "interface.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._interface = type { ptr, ptr }
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%runtime._string = type { ptr, i32 }
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@"reflect/types.type:basic:int" = linkonce_odr constant { i8, ptr } { i8 -62, ptr @"reflect/types.type:pointer:basic:int" }, align 4
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@"reflect/types.type:pointer:basic:int" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:basic:int" }, align 4
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@"reflect/types.type:pointer:named:error" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:named:error" }, align 4
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@"reflect/types.type:named:error" = linkonce_odr constant { i8, i16, ptr, ptr, ptr, [7 x i8] } { i8 116, i16 1, ptr @"reflect/types.type:pointer:named:error", ptr @"reflect/types.type:interface:{Error:func:{}{basic:string}}", ptr @"reflect/types.type.pkgpath.empty", [7 x i8] c".error\00" }, align 4
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@"reflect/types.type.pkgpath.empty" = linkonce_odr unnamed_addr constant [1 x i8] zeroinitializer, align 1
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@"reflect/types.type:interface:{Error:func:{}{basic:string}}" = linkonce_odr constant { i8, ptr } { i8 84, ptr @"reflect/types.type:pointer:interface:{Error:func:{}{basic:string}}" }, align 4
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@"reflect/types.type:pointer:interface:{Error:func:{}{basic:string}}" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:interface:{Error:func:{}{basic:string}}" }, align 4
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@"reflect/types.type:pointer:interface:{String:func:{}{basic:string}}" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:interface:{String:func:{}{basic:string}}" }, align 4
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@"reflect/types.type:interface:{String:func:{}{basic:string}}" = linkonce_odr constant { i8, ptr } { i8 84, ptr @"reflect/types.type:pointer:interface:{String:func:{}{basic:string}}" }, align 4
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@"reflect/types.typeid:basic:int" = external constant i8
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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._interface @main.simpleType(ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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call void @runtime.trackPointer(ptr nonnull @"reflect/types.type:basic:int", ptr nonnull %stackalloc, ptr undef)
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call void @runtime.trackPointer(ptr null, ptr nonnull %stackalloc, ptr undef)
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ret %runtime._interface { ptr @"reflect/types.type:basic:int", ptr null }
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}
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; Function Attrs: nounwind
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define hidden %runtime._interface @main.pointerType(ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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call void @runtime.trackPointer(ptr nonnull @"reflect/types.type:pointer:basic:int", ptr nonnull %stackalloc, ptr undef)
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call void @runtime.trackPointer(ptr null, ptr nonnull %stackalloc, ptr undef)
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ret %runtime._interface { ptr @"reflect/types.type:pointer:basic:int", ptr null }
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}
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; Function Attrs: nounwind
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define hidden %runtime._interface @main.interfaceType(ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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call void @runtime.trackPointer(ptr nonnull @"reflect/types.type:pointer:named:error", ptr nonnull %stackalloc, ptr undef)
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call void @runtime.trackPointer(ptr null, ptr nonnull %stackalloc, ptr undef)
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ret %runtime._interface { ptr @"reflect/types.type:pointer:named:error", ptr null }
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}
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; Function Attrs: nounwind
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define hidden %runtime._interface @main.anonymousInterfaceType(ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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call void @runtime.trackPointer(ptr nonnull @"reflect/types.type:pointer:interface:{String:func:{}{basic:string}}", ptr nonnull %stackalloc, ptr undef)
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call void @runtime.trackPointer(ptr null, ptr nonnull %stackalloc, ptr undef)
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ret %runtime._interface { ptr @"reflect/types.type:pointer:interface:{String:func:{}{basic:string}}", ptr null }
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}
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; Function Attrs: nounwind
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define hidden i1 @main.isInt(ptr %itf.typecode, ptr %itf.value, ptr %context) unnamed_addr #1 {
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entry:
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%typecode = call i1 @runtime.typeAssert(ptr %itf.typecode, ptr nonnull @"reflect/types.typeid:basic:int", ptr undef) #7
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br i1 %typecode, label %typeassert.ok, label %typeassert.next
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typeassert.next: ; preds = %typeassert.ok, %entry
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ret i1 %typecode
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typeassert.ok: ; preds = %entry
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br label %typeassert.next
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}
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declare i1 @runtime.typeAssert(ptr, ptr dereferenceable_or_null(1), ptr) #2
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; Function Attrs: nounwind
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define hidden i1 @main.isError(ptr %itf.typecode, ptr %itf.value, ptr %context) unnamed_addr #1 {
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entry:
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%0 = call i1 @"interface:{Error:func:{}{basic:string}}.$typeassert"(ptr %itf.typecode) #7
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br i1 %0, label %typeassert.ok, label %typeassert.next
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typeassert.next: ; preds = %typeassert.ok, %entry
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ret i1 %0
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typeassert.ok: ; preds = %entry
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br label %typeassert.next
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}
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declare i1 @"interface:{Error:func:{}{basic:string}}.$typeassert"(ptr) #3
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; Function Attrs: nounwind
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define hidden i1 @main.isStringer(ptr %itf.typecode, ptr %itf.value, ptr %context) unnamed_addr #1 {
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entry:
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%0 = call i1 @"interface:{String:func:{}{basic:string}}.$typeassert"(ptr %itf.typecode) #7
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br i1 %0, label %typeassert.ok, label %typeassert.next
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typeassert.next: ; preds = %typeassert.ok, %entry
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ret i1 %0
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typeassert.ok: ; preds = %entry
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br label %typeassert.next
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}
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declare i1 @"interface:{String:func:{}{basic:string}}.$typeassert"(ptr) #4
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; Function Attrs: nounwind
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define hidden i8 @main.callFooMethod(ptr %itf.typecode, ptr %itf.value, ptr %context) unnamed_addr #1 {
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entry:
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%0 = call i8 @"interface:{String:func:{}{basic:string},main.foo:func:{basic:int}{basic:uint8}}.foo$invoke"(ptr %itf.value, i32 3, ptr %itf.typecode, ptr undef) #7
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ret i8 %0
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}
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declare i8 @"interface:{String:func:{}{basic:string},main.foo:func:{basic:int}{basic:uint8}}.foo$invoke"(ptr, i32, ptr, ptr) #5
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; Function Attrs: nounwind
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define hidden %runtime._string @main.callErrorMethod(ptr %itf.typecode, ptr %itf.value, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%0 = call %runtime._string @"interface:{Error:func:{}{basic:string}}.Error$invoke"(ptr %itf.value, ptr %itf.typecode, ptr undef) #7
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%1 = extractvalue %runtime._string %0, 0
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call void @runtime.trackPointer(ptr %1, ptr nonnull %stackalloc, ptr undef)
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ret %runtime._string %0
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}
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declare %runtime._string @"interface:{Error:func:{}{basic:string}}.Error$invoke"(ptr, ptr, ptr) #6
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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 = { "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-methods"="reflect/methods.Error() string" }
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attributes #4 = { "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-methods"="reflect/methods.String() string" }
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attributes #5 = { "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-invoke"="main.$methods.foo(int) uint8" "tinygo-methods"="reflect/methods.String() string; main.$methods.foo(int) uint8" }
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attributes #6 = { "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-invoke"="reflect/methods.Error() string" "tinygo-methods"="reflect/methods.Error() string" }
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attributes #7 = { nounwind }
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