[PATCH] D141451: [clang] report inlining decisions with -Wattribute-{warning|error}

[Aaron Ballman via Phabricator via cfe-commits]

aaron.ballman added a subscriber: cjdb.
aaron.ballman added inline comments.


================
Comment at: clang/lib/CodeGen/CodeGenAction.cpp:863
+  InliningDecisions.push_back(D.getCaller().str());
+  for (size_t i = 0, e = InliningDecisions.size(); i != e; ++i) {
+    std::string S = llvm::demangle(InliningDecisions[i]);
----------------
Alternatively:
```
for (auto Dec : llvm::enumerate(InliningDecisions)) {
  std::string S = llvm::demangle(Dec.value());
  if (Dec.index() == 0)
    Diags.Report(...);
  ...
}
```


================
Comment at: clang/test/Frontend/backend-attribute-error-warning-optimize.c:12
   foo(); // expected-error {{call to 'foo' declared with 'error' attribute: oh no foo}}
+         // expected-note@* {{In function 'baz'}}
   if (x())
----------------
nickdesaulniers wrote:
> nickdesaulniers wrote:
> > aaron.ballman wrote:
> > > Instead of allowing this note to appear anywhere in the file, I think it's better to use "bookmark" comments. e.g.,
> > > ```
> > > void baz() { // #baz_defn
> > > }
> > > 
> > > void foo() {
> > >   baz(); // expected-note@#baz_defn {{whatever note text}}
> > > }
> > > ```
> > > so that we're testing where the diagnostic is emitted. (This is especially important given that the changes are about location tracking.)
> > oh, that's new (to me)! will do
> It looks like the "bookmarks" don't work because the notes do not line+col info. They follow the warning/error diagnostic which does, on the bottom most call site.
> 
> The warning is supposed to be emitted on the callsite, not the definition.
I still don't think this is reasonable for test coverage because this means we'll accept the note *anywhere* in the file. This makes it much too easy to regress the behavior accidentally (e.g., accidentally emit all the notes on line 1 of the file). I think we need *some* way to nail down where these notes are emitted in the test. However, I might be asking you to solve "please track location information through the backend" for that, so perhaps this isn't a reasonable request?

Also, CC @cjdb for awareness of how this kind of diagnostic is produced (Chris is working on an idea for how we emit diagnostics so we get better structured information from them, so knowing about this novel approach might impact that idea).


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D141451/new/

https://reviews.llvm.org/D141451