[PATCH] D135411: Add generic KCFI operand bundle lowering

[Nick Desaulniers via Phabricator via cfe-commits]

nickdesaulniers added inline comments.


================
Comment at: llvm/lib/Transforms/Instrumentation/KCFI.cpp:48-49
+  SmallVector<CallInst *, 8> KCFICalls;
+  for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
+    if (auto *CI = dyn_cast<CallInst>(&*I))
+      if (CI->getOperandBundle(LLVMContext::OB_kcfi))
----------------
samitolvanen wrote:
> nickdesaulniers wrote:
> > prefer a range-for here
> > ```
> > for (Instruction &I : F)
> >   if (auto &CI = dyn_cast<CallInst>(I);
> > ```
> `Function` doesn't directly support iterating through instructions. I used `inst_iterator` here to avoid looping through basic blocks as well. Your example results in:
> ```
> error: non-const lvalue reference to type 'llvm::Instruction' cannot bind to a value of unrelated type 'llvm::BasicBlock'
> ```
That's right, sorry, you'd need either a double-nested for loop

for BB : F
  for I : BB

or

for I :  instructions(F)

Please use that ^.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D135411/new/

https://reviews.llvm.org/D135411