Don't crash on variable sized gc allocations

JuliaLang · Sep 26, 2022 · de49fde · de49fde
1 parent 83a3ab6
commit de49fde
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/llvm-alloc-opt.cpp b/src/llvm-alloc-opt.cpp
@@ -436,7 +436,10 @@ ssize_t Optimizer::getGCAllocSize(Instruction *I)
     if (call->getCalledValue() != pass.alloc_obj)
         return -1;
     assert(call->getNumArgOperands() == 3);
-    size_t sz = (size_t)cast<ConstantInt>(call->getArgOperand(1))->getZExtValue();
+    auto CI = dyn_cast<ConstantInt>(call->getArgOperand(1));
+    if (!CI)
+        return -1;
+    size_t sz = (size_t)CI->getZExtValue();
     if (sz < IntegerType::MAX_INT_BITS / 8 && sz < INT32_MAX)
         return sz;
     return -1;