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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/defer-cortex-m-qemu.ll
Vendored
+11 -11
View File
@@ -3,7 +3,7 @@ source_filename = "defer.go"
target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv7m-unknown-unknown-eabi"
%runtime.deferFrame = type { ptr, ptr, [0 x ptr], ptr, i1, %runtime._interface }
%runtime.deferFrameInlineAsm = type { ptr, ptr, [0 x ptr], ptr, i1, %runtime._interface }
%runtime._interface = type { ptr, ptr }
%runtime._defer = type { i32, ptr }
@@ -24,9 +24,9 @@ entry:
%defer.alloca = alloca { i32, ptr }, align 4
%deferPtr = alloca ptr, align 4
store ptr null, ptr %deferPtr, align 4
%deferframe.buf = alloca %runtime.deferFrame, align 4
%deferframe.buf = alloca %runtime.deferFrameInlineAsm, align 4
%0 = call ptr @llvm.stacksave.p0()
call void @runtime.setupDeferFrame(ptr nonnull %deferframe.buf, ptr %0, ptr undef) #4
call void @runtime.setupDeferFrameInlineAsm(ptr nonnull %deferframe.buf, ptr %0, ptr undef) #4
store i32 0, ptr %defer.alloca, align 4
%defer.alloca.repack15 = getelementptr inbounds { i32, ptr }, ptr %defer.alloca, i32 0, i32 1
store ptr null, ptr %defer.alloca.repack15, align 4
@@ -40,7 +40,7 @@ entry:
br label %rundefers.block
rundefers.after: ; preds = %rundefers.end
call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
call void @runtime.destroyDeferFrameInlineAsm(ptr nonnull %deferframe.buf, ptr undef) #4
ret void
rundefers.block: ; preds = %1
@@ -76,7 +76,7 @@ rundefers.end: ; preds = %rundefers.loophead
br label %rundefers.after
recover: ; preds = %rundefers.end3
call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
call void @runtime.destroyDeferFrameInlineAsm(ptr nonnull %deferframe.buf, ptr undef) #4
ret void
lpad: ; preds = %rundefers.callback012, %rundefers.callback0, %entry
@@ -115,9 +115,9 @@ rundefers.end3: ; preds = %rundefers.loophead6
; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #3
declare void @runtime.setupDeferFrame(ptr dereferenceable_or_null(24), ptr, ptr) #2
declare void @runtime.setupDeferFrameInlineAsm(ptr dereferenceable_or_null(24), ptr, ptr) #2
declare void @runtime.destroyDeferFrame(ptr dereferenceable_or_null(24), ptr) #2
declare void @runtime.destroyDeferFrameInlineAsm(ptr dereferenceable_or_null(24), ptr) #2
; Function Attrs: nounwind
define internal void @"main.deferSimple$1"(ptr %context) unnamed_addr #1 {
@@ -135,9 +135,9 @@ entry:
%defer.alloca = alloca { i32, ptr }, align 4
%deferPtr = alloca ptr, align 4
store ptr null, ptr %deferPtr, align 4
%deferframe.buf = alloca %runtime.deferFrame, align 4
%deferframe.buf = alloca %runtime.deferFrameInlineAsm, align 4
%0 = call ptr @llvm.stacksave.p0()
call void @runtime.setupDeferFrame(ptr nonnull %deferframe.buf, ptr %0, ptr undef) #4
call void @runtime.setupDeferFrameInlineAsm(ptr nonnull %deferframe.buf, ptr %0, ptr undef) #4
store i32 0, ptr %defer.alloca, align 4
%defer.alloca.repack22 = getelementptr inbounds { i32, ptr }, ptr %defer.alloca, i32 0, i32 1
store ptr null, ptr %defer.alloca.repack22, align 4
@@ -155,7 +155,7 @@ entry:
br label %rundefers.block
rundefers.after: ; preds = %rundefers.end
call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
call void @runtime.destroyDeferFrameInlineAsm(ptr nonnull %deferframe.buf, ptr undef) #4
ret void
rundefers.block: ; preds = %1
@@ -201,7 +201,7 @@ rundefers.end: ; preds = %rundefers.loophead
br label %rundefers.after
recover: ; preds = %rundefers.end7
call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
call void @runtime.destroyDeferFrameInlineAsm(ptr nonnull %deferframe.buf, ptr undef) #4
ret void
lpad: ; preds = %rundefers.callback119, %rundefers.callback016, %rundefers.callback1, %rundefers.callback0, %entry