fix for #18: initializing comm memory

d933a639 · Brendan Gregg · ac109604 · d933a639
Commit d933a639 authored Mar 06, 2018 by Brendan Gregg
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src/ast/codegen_llvm.cpp src/ast/codegen_llvm.cpp +2 -0

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--- a/src/ast/codegen_llvm.cpp
+++ b/src/ast/codegen_llvm.cpp
@@ -69,6 +69,8 @@ void CodegenLLVM::visit(Builtin &builtin)
  else if (builtin.ident == "comm")
  {
    AllocaInst *buf = b_.CreateAllocaBPF(builtin.type, "comm");
+    // initializing memory needed for older kernels:
+    b_.CreateMemSet(buf, b_.getInt8(0), builtin.type.size, 1);
    b_.CreateGetCurrentComm(buf, builtin.type.size);
    expr_ = buf;
  }