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.
99 lines
3.2 KiB
LLVM
99 lines
3.2 KiB
LLVM
; ModuleID = 'float.go'
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source_filename = "float.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.f32tou32(float %v, ptr %context) unnamed_addr #1 {
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entry:
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%positive = fcmp oge float %v, 0.000000e+00
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%withinmax = fcmp ole float %v, 0x41EFFFFFC0000000
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%inbounds = and i1 %positive, %withinmax
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%saturated = sext i1 %positive to i32
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%normal = fptoui float %v to i32
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%0 = select i1 %inbounds, i32 %normal, i32 %saturated
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ret i32 %0
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}
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; Function Attrs: nounwind
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define hidden float @main.maxu32f(ptr %context) unnamed_addr #1 {
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entry:
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ret float 0x41F0000000000000
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}
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; Function Attrs: nounwind
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define hidden i32 @main.maxu32tof32(ptr %context) unnamed_addr #1 {
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entry:
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ret i32 -1
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}
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; Function Attrs: nounwind
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define hidden { i32, i32, i32, i32 } @main.inftoi32(ptr %context) unnamed_addr #1 {
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entry:
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ret { i32, i32, i32, i32 } { i32 -1, i32 0, i32 2147483647, i32 -2147483648 }
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}
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; Function Attrs: nounwind
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define hidden i32 @main.u32tof32tou32(i32 %v, ptr %context) unnamed_addr #1 {
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entry:
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%0 = uitofp i32 %v to float
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%withinmax = fcmp ole float %0, 0x41EFFFFFC0000000
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%normal = fptoui float %0 to i32
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%1 = select i1 %withinmax, i32 %normal, i32 -1
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ret i32 %1
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}
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; Function Attrs: nounwind
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define hidden float @main.f32tou32tof32(float %v, ptr %context) unnamed_addr #1 {
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entry:
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%positive = fcmp oge float %v, 0.000000e+00
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%withinmax = fcmp ole float %v, 0x41EFFFFFC0000000
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%inbounds = and i1 %positive, %withinmax
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%saturated = sext i1 %positive to i32
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%normal = fptoui float %v to i32
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%0 = select i1 %inbounds, i32 %normal, i32 %saturated
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%1 = uitofp i32 %0 to float
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ret float %1
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}
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; Function Attrs: nounwind
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define hidden i8 @main.f32tou8(float %v, ptr %context) unnamed_addr #1 {
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entry:
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%positive = fcmp oge float %v, 0.000000e+00
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%withinmax = fcmp ole float %v, 2.550000e+02
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%inbounds = and i1 %positive, %withinmax
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%saturated = sext i1 %positive to i8
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%normal = fptoui float %v to i8
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%0 = select i1 %inbounds, i8 %normal, i8 %saturated
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ret i8 %0
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}
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; Function Attrs: nounwind
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define hidden i8 @main.f32toi8(float %v, ptr %context) unnamed_addr #1 {
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entry:
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%abovemin = fcmp oge float %v, -1.280000e+02
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%belowmax = fcmp ole float %v, 1.270000e+02
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%inbounds = and i1 %abovemin, %belowmax
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%saturated = select i1 %abovemin, i8 127, i8 -128
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%isnan = fcmp uno float %v, 0.000000e+00
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%remapped = select i1 %isnan, i8 0, i8 %saturated
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%normal = fptosi float %v to i8
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%0 = select i1 %inbounds, i8 %normal, i8 %remapped
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ret i8 %0
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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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