[WebAssembly] Don't create bitcast-wrappers for varargs.
WebAssembly varargs functions use a significantly different ABI than
non-varargs functions, and the current code in
WebAssemblyFixFunctionBitcasts doesn't handle that difference. For now,
just avoid creating wrapper functions in the presence of varargs.
llvm-svn: 292645
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
index adf904e..cdbd9ea 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyFixFunctionBitcasts.cpp
@@ -148,6 +148,11 @@
if (!Ty)
continue;
+ // Wasm varargs are not ABI-compatible with non-varargs. Just ignore
+ // such casts for now.
+ if (Ty->isVarArg() || F->isVarArg())
+ continue;
+
auto Pair = Wrappers.insert(std::make_pair(std::make_pair(F, Ty), nullptr));
if (Pair.second)
Pair.first->second = CreateWrapper(F, Ty);