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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/slice.ll
Vendored
+43 -42
View File
@@ -6,28 +6,29 @@ 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 i32 @main.sliceLen(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #2 {
define hidden i32 @main.sliceLen(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #1 {
entry:
ret i32 %ints.len
}
; Function Attrs: nounwind
define hidden i32 @main.sliceCap(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #2 {
define hidden i32 @main.sliceCap(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #1 {
entry:
ret i32 %ints.cap
}
; Function Attrs: nounwind
define hidden i32 @main.sliceElement(ptr %ints.data, i32 %ints.len, i32 %ints.cap, i32 %index, ptr %context) unnamed_addr #2 {
define hidden i32 @main.sliceElement(ptr %ints.data, i32 %ints.len, i32 %ints.cap, i32 %index, ptr %context) unnamed_addr #1 {
entry:
%.not = icmp ult i32 %index, %ints.len
br i1 %.not, label %lookup.next, label %lookup.throw
@@ -42,14 +43,14 @@ lookup.throw: ; preds = %entry
unreachable
}
declare void @runtime.lookupPanic(ptr) #1
declare void @runtime.lookupPanic(ptr) #2
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.sliceAppendValues(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.sliceAppendValues(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%varargs = call align 4 dereferenceable(12) ptr @runtime.alloc(i32 12, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %varargs, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %varargs, ptr nonnull %stackalloc, ptr undef)
store i32 1, ptr %varargs, align 4
%0 = getelementptr inbounds [3 x i32], ptr %varargs, i32 0, i32 1
store i32 2, ptr %0, align 4
@@ -62,14 +63,14 @@ entry:
%2 = insertvalue { ptr, i32, i32 } undef, ptr %append.newPtr, 0
%3 = insertvalue { ptr, i32, i32 } %2, i32 %append.newLen, 1
%4 = insertvalue { ptr, i32, i32 } %3, i32 %append.newCap, 2
call void @runtime.trackPointer(ptr %append.newPtr, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %append.newPtr, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %4
}
declare { ptr, i32, i32 } @runtime.sliceAppend(ptr, ptr nocapture readonly, i32, i32, i32, i32, ptr) #1
declare { ptr, i32, i32 } @runtime.sliceAppend(ptr, ptr nocapture readonly, i32, i32, i32, i32, ptr) #2
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.sliceAppendSlice(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %added.data, i32 %added.len, i32 %added.cap, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.sliceAppendSlice(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %added.data, i32 %added.len, i32 %added.cap, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%append.new = call { ptr, i32, i32 } @runtime.sliceAppend(ptr %ints.data, ptr %added.data, i32 %ints.len, i32 %ints.cap, i32 %added.len, i32 4, ptr undef) #3
@@ -79,21 +80,21 @@ entry:
%0 = insertvalue { ptr, i32, i32 } undef, ptr %append.newPtr, 0
%1 = insertvalue { ptr, i32, i32 } %0, i32 %append.newLen, 1
%2 = insertvalue { ptr, i32, i32 } %1, i32 %append.newCap, 2
call void @runtime.trackPointer(ptr %append.newPtr, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %append.newPtr, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %2
}
; Function Attrs: nounwind
define hidden i32 @main.sliceCopy(ptr %dst.data, i32 %dst.len, i32 %dst.cap, ptr %src.data, i32 %src.len, i32 %src.cap, ptr %context) unnamed_addr #2 {
define hidden i32 @main.sliceCopy(ptr %dst.data, i32 %dst.len, i32 %dst.cap, ptr %src.data, i32 %src.len, i32 %src.cap, ptr %context) unnamed_addr #1 {
entry:
%copy.n = call i32 @runtime.sliceCopy(ptr %dst.data, ptr %src.data, i32 %dst.len, i32 %src.len, i32 4, ptr undef) #3
ret i32 %copy.n
}
declare i32 @runtime.sliceCopy(ptr nocapture writeonly, ptr nocapture readonly, i32, i32, i32, ptr) #1
declare i32 @runtime.sliceCopy(ptr nocapture writeonly, ptr nocapture readonly, i32, i32, i32, ptr) #2
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.makeByteSlice(i32 %len, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.makeByteSlice(i32 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%slice.maxcap = icmp slt i32 %len, 0
@@ -104,7 +105,7 @@ slice.next: ; preds = %entry
%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %2
slice.throw: ; preds = %entry
@@ -112,10 +113,10 @@ slice.throw: ; preds = %entry
unreachable
}
declare void @runtime.slicePanic(ptr) #1
declare void @runtime.slicePanic(ptr) #2
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.makeInt16Slice(i32 %len, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.makeInt16Slice(i32 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%slice.maxcap = icmp slt i32 %len, 0
@@ -127,7 +128,7 @@ slice.next: ; preds = %entry
%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %2
slice.throw: ; preds = %entry
@@ -136,7 +137,7 @@ slice.throw: ; preds = %entry
}
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.makeArraySlice(i32 %len, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.makeArraySlice(i32 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%slice.maxcap = icmp ugt i32 %len, 1431655765
@@ -148,7 +149,7 @@ slice.next: ; preds = %entry
%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %2
slice.throw: ; preds = %entry
@@ -157,7 +158,7 @@ slice.throw: ; preds = %entry
}
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.makeInt32Slice(i32 %len, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.makeInt32Slice(i32 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%slice.maxcap = icmp ugt i32 %len, 1073741823
@@ -169,7 +170,7 @@ slice.next: ; preds = %entry
%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %2
slice.throw: ; preds = %entry
@@ -178,26 +179,26 @@ slice.throw: ; preds = %entry
}
; Function Attrs: nounwind
define hidden ptr @main.Add32(ptr %p, i32 %len, ptr %context) unnamed_addr #2 {
define hidden ptr @main.Add32(ptr %p, i32 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%0 = getelementptr i8, ptr %p, i32 %len
call void @runtime.trackPointer(ptr %0, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %0, ptr nonnull %stackalloc, ptr undef)
ret ptr %0
}
; Function Attrs: nounwind
define hidden ptr @main.Add64(ptr %p, i64 %len, ptr %context) unnamed_addr #2 {
define hidden ptr @main.Add64(ptr %p, i64 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%0 = trunc i64 %len to i32
%1 = getelementptr i8, ptr %p, i32 %0
call void @runtime.trackPointer(ptr %1, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %1, ptr nonnull %stackalloc, ptr undef)
ret ptr %1
}
; Function Attrs: nounwind
define hidden ptr @main.SliceToArray(ptr %s.data, i32 %s.len, i32 %s.cap, ptr %context) unnamed_addr #2 {
define hidden ptr @main.SliceToArray(ptr %s.data, i32 %s.len, i32 %s.cap, ptr %context) unnamed_addr #1 {
entry:
%0 = icmp ult i32 %s.len, 4
br i1 %0, label %slicetoarray.throw, label %slicetoarray.next
@@ -210,14 +211,14 @@ slicetoarray.throw: ; preds = %entry
unreachable
}
declare void @runtime.sliceToArrayPointerPanic(ptr) #1
declare void @runtime.sliceToArrayPointerPanic(ptr) #2
; Function Attrs: nounwind
define hidden ptr @main.SliceToArrayConst(ptr %context) unnamed_addr #2 {
define hidden ptr @main.SliceToArrayConst(ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%makeslice = call align 4 dereferenceable(24) ptr @runtime.alloc(i32 24, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %makeslice, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr nonnull %makeslice, ptr nonnull %stackalloc, ptr undef)
br i1 false, label %slicetoarray.throw, label %slicetoarray.next
slicetoarray.next: ; preds = %entry
@@ -228,7 +229,7 @@ slicetoarray.throw: ; preds = %entry
}
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.SliceInt(ptr dereferenceable_or_null(4) %ptr, i32 %len, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.SliceInt(ptr dereferenceable_or_null(4) %ptr, i32 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%0 = icmp ugt i32 %len, 1073741823
@@ -242,7 +243,7 @@ unsafe.Slice.next: ; preds = %entry
%5 = insertvalue { ptr, i32, i32 } undef, ptr %ptr, 0
%6 = insertvalue { ptr, i32, i32 } %5, i32 %len, 1
%7 = insertvalue { ptr, i32, i32 } %6, i32 %len, 2
call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %7
unsafe.Slice.throw: ; preds = %entry
@@ -250,10 +251,10 @@ unsafe.Slice.throw: ; preds = %entry
unreachable
}
declare void @runtime.unsafeSlicePanic(ptr) #1
declare void @runtime.unsafeSlicePanic(ptr) #2
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.SliceUint16(ptr dereferenceable_or_null(1) %ptr, i16 %len, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.SliceUint16(ptr dereferenceable_or_null(1) %ptr, i16 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%0 = icmp eq ptr %ptr, null
@@ -266,7 +267,7 @@ unsafe.Slice.next: ; preds = %entry
%4 = insertvalue { ptr, i32, i32 } undef, ptr %ptr, 0
%5 = insertvalue { ptr, i32, i32 } %4, i32 %3, 1
%6 = insertvalue { ptr, i32, i32 } %5, i32 %3, 2
call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %6
unsafe.Slice.throw: ; preds = %entry
@@ -275,7 +276,7 @@ unsafe.Slice.throw: ; preds = %entry
}
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.SliceUint64(ptr dereferenceable_or_null(4) %ptr, i64 %len, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.SliceUint64(ptr dereferenceable_or_null(4) %ptr, i64 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%0 = icmp ugt i64 %len, 1073741823
@@ -290,7 +291,7 @@ unsafe.Slice.next: ; preds = %entry
%6 = insertvalue { ptr, i32, i32 } undef, ptr %ptr, 0
%7 = insertvalue { ptr, i32, i32 } %6, i32 %5, 1
%8 = insertvalue { ptr, i32, i32 } %7, i32 %5, 2
call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %8
unsafe.Slice.throw: ; preds = %entry
@@ -299,7 +300,7 @@ unsafe.Slice.throw: ; preds = %entry
}
; Function Attrs: nounwind
define hidden { ptr, i32, i32 } @main.SliceInt64(ptr dereferenceable_or_null(4) %ptr, i64 %len, ptr %context) unnamed_addr #2 {
define hidden { ptr, i32, i32 } @main.SliceInt64(ptr dereferenceable_or_null(4) %ptr, i64 %len, ptr %context) unnamed_addr #1 {
entry:
%stackalloc = alloca i8, align 1
%0 = icmp ugt i64 %len, 1073741823
@@ -314,7 +315,7 @@ unsafe.Slice.next: ; preds = %entry
%6 = insertvalue { ptr, i32, i32 } undef, ptr %ptr, 0
%7 = insertvalue { ptr, i32, i32 } %6, i32 %5, 1
%8 = insertvalue { ptr, i32, i32 } %7, i32 %5, 2
call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef) #3
call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef)
ret { ptr, i32, i32 } %8
unsafe.Slice.throw: ; preds = %entry
@@ -322,7 +323,7 @@ unsafe.Slice.throw: ; preds = %entry
unreachable
}
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 #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" }
attributes #2 = { "target-features"="+bulk-memory,+exception-handling,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
attributes #3 = { nounwind }