[compiler-rt] [llvm] [LowerTypeTests] Add debug info to jump table entries (PR #194493)

[Florian Mayer via llvm-commits]

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@@ -1523,25 +1524,87 @@ Triple::ArchType LowerTypeTestsModule::selectJumpTableArmEncoding(
   return ArmCount > ThumbCount ? Triple::arm : Triple::thumb;
 }
 
+// Create location for each function entry which should look like this:
+// frame #0: c::c() (.cfi_jt) at sanitizer/ubsan_interface.h:0:0
+// frame #1: __ubsan_check_cfi_icall_jt at sanitizer/ubsan_interface.h:0
+// frame #2: .cfi.jumptable.81 at sanitizer/ubsan_interface.h:0:0
+static SmallVector<DILocation *>
+createJumpTableDebugInfo(Function *F, ArrayRef<GlobalTypeMember *> Functions) {
+  Module &M = *F->getParent();
+  DICompileUnit *CU = nullptr;
+  auto CUs = M.debug_compile_units();
+  if (!CUs.empty())
+    CU = *CUs.begin();
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fmayer wrote:

does this have `.front()`?

https://github.com/llvm/llvm-project/pull/194493