1d4e04f7a7
On Wasm, it's not currently possibly to change which `personality` is attached to a given IR function. This is primarily because no matter what `personality` is attached, codegen creates a call to a `Unwind_CallPersonality` wrapper hard-coded to call c++abi's personality. In order to allow alternative personalities without introducing bloat at each personality call site, this PR adjusts the ABI of the personality on Wasm. `Unwind_CallPersonality` is moved to `libcxxabi` under the name `__gxx_wasm_personality_v0`, with the "real" personality code renamed `__gxx_personality_imp` and called by `__gxx_wasm_personality_v0` (after resetting the landing pad context). The signature of EH personalities on Wasm is now `int personality(void* exception_object)` (where the int return is `_Unwind_Reason_Code` and the `void*` is `_Unwind_Exception*`), and personalities are expected to `__wasm_lpad_context.selector = 0;`. Based on #175202
68 lines
2.6 KiB
LLVM
68 lines
2.6 KiB
LLVM
; RUN: not --crash opt < %s -wasm-lower-em-ehsjlj -wasm-enable-eh -wasm-enable-sjlj -mattr=+exception-handling -S 2>&1 | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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%struct.__jmp_buf_tag = type { [6 x i32], i32, [32 x i32] }
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@_ZTIi = external constant ptr
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define void @setjmp_within_catch() personality ptr @__gxx_wasm_personality_v0 {
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entry:
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%buf = alloca [1 x %struct.__jmp_buf_tag], align 16
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invoke void @foo()
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to label %try.cont unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%0 = catchswitch within none [label %catch.start] unwind to caller
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catch.start: ; preds = %catch.dispatch
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%1 = catchpad within %0 [ptr @_ZTIi]
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%2 = call ptr @llvm.wasm.get.exception(token %1)
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%3 = call i32 @llvm.wasm.get.ehselector(token %1)
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%4 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi) #0
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%matches = icmp eq i32 %3, %4
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br i1 %matches, label %catch, label %rethrow
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catch: ; preds = %catch.start
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%5 = call ptr @__cxa_begin_catch(ptr %2) #0 [ "funclet"(token %1) ]
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%6 = load i32, ptr %5, align 4
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; CHECK: LLVM ERROR: In function setjmp_within_catch: setjmp within a catch clause is not supported in Wasm EH
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; CHECK-NEXT: %call = invoke i32 @setjmp
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%call = invoke i32 @setjmp(ptr noundef %buf) #2 [ "funclet"(token %1) ]
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to label %invoke.cont1 unwind label %ehcleanup
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invoke.cont1: ; preds = %catch
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call void @__cxa_end_catch() #0 [ "funclet"(token %1) ]
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catchret from %1 to label %try.cont
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rethrow: ; preds = %catch.start
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call void @llvm.wasm.rethrow() #1 [ "funclet"(token %1) ]
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unreachable
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try.cont: ; preds = %entry, %invoke.cont1
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ret void
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ehcleanup: ; preds = %catch
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%7 = cleanuppad within %1 []
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call void @__cxa_end_catch() #0 [ "funclet"(token %7) ]
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cleanupret from %7 unwind to caller
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}
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declare void @foo()
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declare i32 @__gxx_wasm_personality_v0(ptr)
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; Function Attrs: nounwind
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declare ptr @llvm.wasm.get.exception(token) #0
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; Function Attrs: nounwind
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declare i32 @llvm.wasm.get.ehselector(token) #0
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; Function Attrs: nounwind
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declare i32 @llvm.eh.typeid.for(ptr) #0
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; Function Attrs: noreturn
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declare void @llvm.wasm.rethrow() #1
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declare ptr @__cxa_begin_catch(ptr)
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; Function Attrs: returns_twice
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declare i32 @setjmp(ptr noundef) #2
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declare void @__cxa_end_catch()
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attributes #0 = { nounwind }
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attributes #1 = { noreturn }
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attributes #2 = { returns_twice }
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