[PATCH] D93094: [clang][cli] Prevent double denormalization

Tue Dec 15 02:14:17 PST 2020

jansvoboda11 added inline comments.

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Comment at: clang/unittests/Frontend/CompilerInvocationTest.cpp:267

-  ASSERT_THAT(GeneratedArgs, Contains(StrEq("-fdebug-pass-manager")));
+  ASSERT_EQ(count(GeneratedArgs, "-fdebug-pass-manager"), 1);
   ASSERT_THAT(GeneratedArgs, Not(Contains(StrEq("-fno-debug-pass-manager"))));
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dexonsmith wrote:
> jansvoboda11 wrote:
> > Is it wise to rely on pointer comparison here? The call to `count` returns 2 before changing the denormalizer and 1 after, but I'm not sure if it will work on all platforms.
> Does this compile / avoid the pointer comparison?
> ```
> ASSERT_EQ(count(GeneratedArgs, StringRef("-fdebug-pass-manager")), 1);
> ```
Yes, this forces the `const char *` from GeneratedArgs to be converted into `StringRef`, which does comparison via `::memcmp`.

If we decide comparing `StringRef`s is a better solution, I'd be inclined to create a helper function or custom matcher that does the conversion to `StringRef`. That way, we don't have to worry about doing the right thing in test cases.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D93094/new/

https://reviews.llvm.org/D93094