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[WebAssembly] Fix landingpad-only case in Emscripten EH #30

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Merged
merged 1 commit into from
Jan 7, 2020
Merged

[WebAssembly] Fix landingpad-only case in Emscripten EH #30

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2 changes: 1 addition & 1 deletion llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -755,7 +755,6 @@ bool WebAssemblyLowerEmscriptenEHSjLj::runEHOnFunction(Function &F) {
auto *II = dyn_cast<InvokeInst>(BB.getTerminator());
if (!II)
continue;
Changed = true;
LandingPads.insert(II->getLandingPadInst());
IRB.SetInsertPoint(II);

Expand Down Expand Up @@ -835,6 +834,7 @@ bool WebAssemblyLowerEmscriptenEHSjLj::runEHOnFunction(Function &F) {
if (auto *LPI = dyn_cast<LandingPadInst>(I))
LandingPads.insert(LPI);
}
Changed = !LandingPads.empty();

// Handle all the landingpad for this function together, as multiple invokes
// may share a single lp
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25 changes: 25 additions & 0 deletions llvm/test/CodeGen/WebAssembly/lower-em-exceptions-lpad-only.ll
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@@ -0,0 +1,25 @@
; RUN: opt < %s -wasm-lower-em-ehsjlj -S | FileCheck %s

target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"

@_ZTIi = external constant i8*

; Checks if a module that only contains a landingpad (and resume) but not an
; invoke works correctly and does not crash.
; CHECK-LABEL: @landingpad_only
define void @landingpad_only() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
entry:
br label %cont

lpad: ; preds = %entry
%0 = landingpad { i8*, i32 }
catch i8* bitcast (i8** @_ZTIi to i8*)
catch i8* null
resume { i8*, i32 } %0

cont:
ret void
}

declare i32 @__gxx_personality_v0(...)