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
87 lines
3.8 KiB
LLVM
87 lines
3.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -mtriple=wasm32-unknown-unknown -S --passes=expand-variadics --expand-variadics-override=optimize < %s | FileCheck %s
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; RUN: not --crash opt -mtriple=wasm32-unknown-unknown -S --passes=expand-variadics --expand-variadics-override=lowering < %s 2>&1 | FileCheck %s -check-prefixes=ERROR
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; REQUIRES: webassembly-registered-target
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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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; ERROR: LLVM ERROR: Cannot lower callbase instruction
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@_ZTIi = external constant ptr
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; Function Attrs: mustprogress
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define hidden void @test0(i32 noundef %x) #0 personality ptr @__gxx_wasm_personality_v0 {
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; CHECK-LABEL: @test0(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: invoke void (...) @may_throw(i32 noundef [[X:%.*]])
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; CHECK-NEXT: to label [[TRY_CONT:%.*]] unwind label [[CATCH_DISPATCH:%.*]]
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; CHECK: catch.dispatch:
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; CHECK-NEXT: [[TMP0:%.*]] = catchswitch within none [label %catch.start] unwind to caller
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; CHECK: catch.start:
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; CHECK-NEXT: [[TMP1:%.*]] = catchpad within [[TMP0]] [ptr @_ZTIi]
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; CHECK-NEXT: [[TMP2:%.*]] = tail call ptr @llvm.wasm.get.exception(token [[TMP1]])
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; CHECK-NEXT: [[TMP3:%.*]] = tail call i32 @llvm.wasm.get.ehselector(token [[TMP1]])
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; CHECK-NEXT: [[TMP4:%.*]] = tail call i32 @llvm.eh.typeid.for.p0(ptr nonnull @_ZTIi)
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; CHECK-NEXT: [[MATCHES:%.*]] = icmp eq i32 [[TMP3]], [[TMP4]]
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; CHECK-NEXT: br i1 [[MATCHES]], label [[CATCH:%.*]], label [[RETHROW:%.*]]
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; CHECK: catch:
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; CHECK-NEXT: [[TMP5:%.*]] = call ptr @__cxa_begin_catch(ptr [[TMP2]]) [ "funclet"(token [[TMP1]]) ]
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; CHECK-NEXT: call void (...) @dont_throw(i32 noundef [[X]]) [ "funclet"(token [[TMP1]]) ]
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; CHECK-NEXT: call void @__cxa_end_catch() [ "funclet"(token [[TMP1]]) ]
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; CHECK-NEXT: catchret from [[TMP1]] to label [[TRY_CONT]]
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; CHECK: rethrow:
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; CHECK-NEXT: call void @llvm.wasm.rethrow() [ "funclet"(token [[TMP1]]) ]
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; CHECK-NEXT: unreachable
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; CHECK: try.cont:
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; CHECK-NEXT: ret void
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;
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entry:
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invoke void (...) @may_throw(i32 noundef %x)
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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 = tail call ptr @llvm.wasm.get.exception(token %1)
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%3 = tail call i32 @llvm.wasm.get.ehselector(token %1)
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%4 = tail call i32 @llvm.eh.typeid.for.p0(ptr nonnull @_ZTIi)
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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) #6 [ "funclet"(token %1) ]
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call void (...) @dont_throw(i32 noundef %x) #6 [ "funclet"(token %1) ]
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call void @__cxa_end_catch() #6 [ "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() #5 [ "funclet"(token %1) ]
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unreachable
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try.cont: ; preds = %entry, %catch
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ret void
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}
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declare void @may_throw(...)
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declare i32 @__gxx_wasm_personality_v0(ptr)
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; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
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declare ptr @llvm.wasm.get.exception(token)
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; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
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declare i32 @llvm.wasm.get.ehselector(token)
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; Function Attrs: nofree nosync nounwind memory(none)
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declare i32 @llvm.eh.typeid.for.p0(ptr)
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declare ptr @__cxa_begin_catch(ptr)
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; Function Attrs: nounwind
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declare void @dont_throw(...)
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declare void @__cxa_end_catch()
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; Function Attrs: noreturn
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declare void @llvm.wasm.rethrow()
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