adjust layout string in JIT with llvm11 128bit spec support

To fix the issue (iovisor#2827) which exposed a problem with aarch64 frontend and bpf backend regarding __int128 type, the following llvm patch https://reviews.llvm.org/D76587 landed to explicitly support i128 type in bpf layout spec. Adjust the layout string in bpf_module JIT compilation accordingly. Signed-off-by: Yonghong Song <[email protected]>
drcwr · Apr 6, 2020 · f35dae0 · f35dae0
1 parent 533391e
commit f35dae0
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/src/cc/bpf_module.cc b/src/cc/bpf_module.cc
@@ -446,10 +446,18 @@ int BPFModule::finalize() {
  *sections_p;
 
  mod->setTargetTriple("bpf-pc-linux");
+#if LLVM_MAJOR_VERSION >= 11
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+ mod->setDataLayout("e-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
+#else
+ mod->setDataLayout("E-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
+#endif
+#else
 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  mod->setDataLayout("e-m:e-p:64:64-i64:64-n32:64-S128");
 #else
  mod->setDataLayout("E-m:e-p:64:64-i64:64-n32:64-S128");
+#endif
 #endif
  sections_p = rw_engine_enabled_ ? &sections_ : &tmp_sections;