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.
330 lines
13 KiB
LLVM
330 lines
13 KiB
LLVM
; ModuleID = 'slice.go'
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source_filename = "slice.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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; 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 i32 @main.sliceLen(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #1 {
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entry:
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ret i32 %ints.len
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}
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; Function Attrs: nounwind
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define hidden i32 @main.sliceCap(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #1 {
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entry:
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ret i32 %ints.cap
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}
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; Function Attrs: nounwind
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define hidden i32 @main.sliceElement(ptr %ints.data, i32 %ints.len, i32 %ints.cap, i32 %index, ptr %context) unnamed_addr #1 {
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entry:
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%.not = icmp ult i32 %index, %ints.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 i32, ptr %ints.data, i32 %index
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%1 = load i32, ptr %0, align 4
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ret i32 %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 { ptr, i32, i32 } @main.sliceAppendValues(ptr %ints.data, i32 %ints.len, i32 %ints.cap, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%varargs = call align 4 dereferenceable(12) ptr @runtime.alloc(i32 12, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
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call void @runtime.trackPointer(ptr nonnull %varargs, ptr nonnull %stackalloc, ptr undef)
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store i32 1, ptr %varargs, align 4
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%0 = getelementptr inbounds [3 x i32], ptr %varargs, i32 0, i32 1
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store i32 2, ptr %0, align 4
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%1 = getelementptr inbounds [3 x i32], ptr %varargs, i32 0, i32 2
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store i32 3, ptr %1, align 4
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%append.new = call { ptr, i32, i32 } @runtime.sliceAppend(ptr %ints.data, ptr nonnull %varargs, i32 %ints.len, i32 %ints.cap, i32 3, i32 4, ptr undef) #3
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%append.newPtr = extractvalue { ptr, i32, i32 } %append.new, 0
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%append.newLen = extractvalue { ptr, i32, i32 } %append.new, 1
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%append.newCap = extractvalue { ptr, i32, i32 } %append.new, 2
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%2 = insertvalue { ptr, i32, i32 } undef, ptr %append.newPtr, 0
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%3 = insertvalue { ptr, i32, i32 } %2, i32 %append.newLen, 1
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%4 = insertvalue { ptr, i32, i32 } %3, i32 %append.newCap, 2
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call void @runtime.trackPointer(ptr %append.newPtr, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %4
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}
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declare { ptr, i32, i32 } @runtime.sliceAppend(ptr, ptr nocapture readonly, i32, i32, i32, i32, ptr) #2
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; Function Attrs: nounwind
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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 {
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entry:
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%stackalloc = alloca i8, align 1
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%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
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%append.newPtr = extractvalue { ptr, i32, i32 } %append.new, 0
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%append.newLen = extractvalue { ptr, i32, i32 } %append.new, 1
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%append.newCap = extractvalue { ptr, i32, i32 } %append.new, 2
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%0 = insertvalue { ptr, i32, i32 } undef, ptr %append.newPtr, 0
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%1 = insertvalue { ptr, i32, i32 } %0, i32 %append.newLen, 1
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%2 = insertvalue { ptr, i32, i32 } %1, i32 %append.newCap, 2
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call void @runtime.trackPointer(ptr %append.newPtr, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %2
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}
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; Function Attrs: nounwind
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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 {
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entry:
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%copy.n = call i32 @runtime.sliceCopy(ptr %dst.data, ptr %src.data, i32 %dst.len, i32 %src.len, i32 4, ptr undef) #3
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ret i32 %copy.n
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}
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declare i32 @runtime.sliceCopy(ptr nocapture writeonly, ptr nocapture readonly, i32, i32, i32, ptr) #2
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; Function Attrs: nounwind
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define hidden { ptr, i32, i32 } @main.makeByteSlice(i32 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%slice.maxcap = icmp slt i32 %len, 0
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br i1 %slice.maxcap, label %slice.throw, label %slice.next
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slice.next: ; preds = %entry
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%makeslice.buf = call align 1 ptr @runtime.alloc(i32 %len, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
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%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
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%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
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%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
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call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %2
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slice.throw: ; preds = %entry
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call void @runtime.slicePanic(ptr undef) #3
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unreachable
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}
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declare void @runtime.slicePanic(ptr) #2
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; Function Attrs: nounwind
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define hidden { ptr, i32, i32 } @main.makeInt16Slice(i32 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%slice.maxcap = icmp slt i32 %len, 0
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br i1 %slice.maxcap, label %slice.throw, label %slice.next
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slice.next: ; preds = %entry
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%makeslice.cap = shl nuw i32 %len, 1
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%makeslice.buf = call align 2 ptr @runtime.alloc(i32 %makeslice.cap, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
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%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
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%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
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%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
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call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %2
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slice.throw: ; preds = %entry
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call void @runtime.slicePanic(ptr undef) #3
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unreachable
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}
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; Function Attrs: nounwind
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define hidden { ptr, i32, i32 } @main.makeArraySlice(i32 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%slice.maxcap = icmp ugt i32 %len, 1431655765
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br i1 %slice.maxcap, label %slice.throw, label %slice.next
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slice.next: ; preds = %entry
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%makeslice.cap = mul i32 %len, 3
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%makeslice.buf = call align 1 ptr @runtime.alloc(i32 %makeslice.cap, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
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%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
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%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
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%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
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call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %2
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slice.throw: ; preds = %entry
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call void @runtime.slicePanic(ptr undef) #3
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unreachable
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}
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; Function Attrs: nounwind
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define hidden { ptr, i32, i32 } @main.makeInt32Slice(i32 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%slice.maxcap = icmp ugt i32 %len, 1073741823
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br i1 %slice.maxcap, label %slice.throw, label %slice.next
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slice.next: ; preds = %entry
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%makeslice.cap = shl nuw i32 %len, 2
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%makeslice.buf = call align 4 ptr @runtime.alloc(i32 %makeslice.cap, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
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%0 = insertvalue { ptr, i32, i32 } undef, ptr %makeslice.buf, 0
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%1 = insertvalue { ptr, i32, i32 } %0, i32 %len, 1
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%2 = insertvalue { ptr, i32, i32 } %1, i32 %len, 2
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call void @runtime.trackPointer(ptr nonnull %makeslice.buf, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %2
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slice.throw: ; preds = %entry
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call void @runtime.slicePanic(ptr undef) #3
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unreachable
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}
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; Function Attrs: nounwind
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define hidden ptr @main.Add32(ptr %p, i32 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%0 = getelementptr i8, ptr %p, i32 %len
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call void @runtime.trackPointer(ptr %0, ptr nonnull %stackalloc, ptr undef)
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ret ptr %0
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}
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; Function Attrs: nounwind
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define hidden ptr @main.Add64(ptr %p, i64 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%0 = trunc i64 %len to i32
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%1 = getelementptr i8, ptr %p, i32 %0
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call void @runtime.trackPointer(ptr %1, ptr nonnull %stackalloc, ptr undef)
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ret ptr %1
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}
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; Function Attrs: nounwind
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define hidden ptr @main.SliceToArray(ptr %s.data, i32 %s.len, i32 %s.cap, ptr %context) unnamed_addr #1 {
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entry:
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%0 = icmp ult i32 %s.len, 4
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br i1 %0, label %slicetoarray.throw, label %slicetoarray.next
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slicetoarray.next: ; preds = %entry
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ret ptr %s.data
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slicetoarray.throw: ; preds = %entry
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call void @runtime.sliceToArrayPointerPanic(ptr undef) #3
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unreachable
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}
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declare void @runtime.sliceToArrayPointerPanic(ptr) #2
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; Function Attrs: nounwind
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define hidden ptr @main.SliceToArrayConst(ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%makeslice = call align 4 dereferenceable(24) ptr @runtime.alloc(i32 24, ptr nonnull inttoptr (i32 3 to ptr), ptr undef) #3
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call void @runtime.trackPointer(ptr nonnull %makeslice, ptr nonnull %stackalloc, ptr undef)
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br i1 false, label %slicetoarray.throw, label %slicetoarray.next
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slicetoarray.next: ; preds = %entry
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ret ptr %makeslice
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slicetoarray.throw: ; preds = %entry
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unreachable
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}
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; Function Attrs: nounwind
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define hidden { ptr, i32, i32 } @main.SliceInt(ptr dereferenceable_or_null(4) %ptr, i32 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%0 = icmp ugt i32 %len, 1073741823
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%1 = icmp eq ptr %ptr, null
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%2 = icmp ne i32 %len, 0
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%3 = and i1 %1, %2
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%4 = or i1 %3, %0
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br i1 %4, label %unsafe.Slice.throw, label %unsafe.Slice.next
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unsafe.Slice.next: ; preds = %entry
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%5 = insertvalue { ptr, i32, i32 } undef, ptr %ptr, 0
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%6 = insertvalue { ptr, i32, i32 } %5, i32 %len, 1
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%7 = insertvalue { ptr, i32, i32 } %6, i32 %len, 2
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call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %7
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unsafe.Slice.throw: ; preds = %entry
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call void @runtime.unsafeSlicePanic(ptr undef) #3
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unreachable
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}
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declare void @runtime.unsafeSlicePanic(ptr) #2
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; Function Attrs: nounwind
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define hidden { ptr, i32, i32 } @main.SliceUint16(ptr dereferenceable_or_null(1) %ptr, i16 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%0 = icmp eq ptr %ptr, null
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%1 = icmp ne i16 %len, 0
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%2 = and i1 %0, %1
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br i1 %2, label %unsafe.Slice.throw, label %unsafe.Slice.next
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unsafe.Slice.next: ; preds = %entry
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%3 = zext i16 %len to i32
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%4 = insertvalue { ptr, i32, i32 } undef, ptr %ptr, 0
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%5 = insertvalue { ptr, i32, i32 } %4, i32 %3, 1
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%6 = insertvalue { ptr, i32, i32 } %5, i32 %3, 2
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call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %6
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unsafe.Slice.throw: ; preds = %entry
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call void @runtime.unsafeSlicePanic(ptr undef) #3
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unreachable
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}
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; Function Attrs: nounwind
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define hidden { ptr, i32, i32 } @main.SliceUint64(ptr dereferenceable_or_null(4) %ptr, i64 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%0 = icmp ugt i64 %len, 1073741823
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%1 = icmp eq ptr %ptr, null
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%2 = icmp ne i64 %len, 0
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%3 = and i1 %1, %2
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%4 = or i1 %3, %0
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br i1 %4, label %unsafe.Slice.throw, label %unsafe.Slice.next
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unsafe.Slice.next: ; preds = %entry
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%5 = trunc i64 %len to i32
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%6 = insertvalue { ptr, i32, i32 } undef, ptr %ptr, 0
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%7 = insertvalue { ptr, i32, i32 } %6, i32 %5, 1
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%8 = insertvalue { ptr, i32, i32 } %7, i32 %5, 2
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call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %8
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unsafe.Slice.throw: ; preds = %entry
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call void @runtime.unsafeSlicePanic(ptr undef) #3
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unreachable
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}
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; Function Attrs: nounwind
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define hidden { ptr, i32, i32 } @main.SliceInt64(ptr dereferenceable_or_null(4) %ptr, i64 %len, ptr %context) unnamed_addr #1 {
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entry:
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%stackalloc = alloca i8, align 1
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%0 = icmp ugt i64 %len, 1073741823
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%1 = icmp eq ptr %ptr, null
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%2 = icmp ne i64 %len, 0
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%3 = and i1 %1, %2
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%4 = or i1 %3, %0
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br i1 %4, label %unsafe.Slice.throw, label %unsafe.Slice.next
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unsafe.Slice.next: ; preds = %entry
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%5 = trunc i64 %len to i32
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%6 = insertvalue { ptr, i32, i32 } undef, ptr %ptr, 0
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%7 = insertvalue { ptr, i32, i32 } %6, i32 %5, 1
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%8 = insertvalue { ptr, i32, i32 } %7, i32 %5, 2
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call void @runtime.trackPointer(ptr %ptr, ptr nonnull %stackalloc, ptr undef)
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ret { ptr, i32, i32 } %8
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unsafe.Slice.throw: ; preds = %entry
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call void @runtime.unsafeSlicePanic(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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