[PATCH] D50645: [clangd] Show non-instantiated decls in signatureHelp

[Yvan Roux via llvm-commits]

Hi Ilya,

This commit broke some of ARM's bots, log are available here:

http://lab.llvm.org:8011/builders/clang-cmake-armv7-quick/builds/3120/steps/ninja%20check%201/logs/stdio

Thanks
Yvan

On Tue, 14 Aug 2018 at 11:37, Phabricator via Phabricator via
cfe-commits <cfe-commits at lists.llvm.org> wrote:
>
> This revision was automatically updated to reflect the committed changes.
> Closed by commit rL339665: [clangd] Show non-instantiated decls in signatureHelp (authored by ibiryukov, committed by ).
> Herald added a subscriber: llvm-commits.
>
> Repository:
>   rL LLVM
>
> https://reviews.llvm.org/D50645
>
> Files:
>   clang-tools-extra/trunk/clangd/CodeComplete.cpp
>   clang-tools-extra/trunk/unittests/clangd/CodeCompleteTests.cpp
>
>
> Index: clang-tools-extra/trunk/unittests/clangd/CodeCompleteTests.cpp
> ===================================================================
> --- clang-tools-extra/trunk/unittests/clangd/CodeCompleteTests.cpp
> +++ clang-tools-extra/trunk/unittests/clangd/CodeCompleteTests.cpp
> @@ -1537,6 +1537,59 @@
>    EXPECT_EQ(0, Results.activeParameter);
>  }
>
> +TEST(SignatureHelpTest, InstantiatedSignatures) {
> +  EXPECT_THAT(signatures(R"cpp(
> +    template <class T>
> +    void foo(T, T, T);
> +
> +    int main() {
> +      foo<int>(^);
> +    }
> +  )cpp")
> +                  .signatures,
> +              ElementsAre(Sig("foo(T, T, T) -> void", {"T", "T", "T"})));
> +
> +  EXPECT_THAT(signatures(R"cpp(
> +    template <class T>
> +    void foo(T, T, T);
> +
> +    int main() {
> +      foo(10, ^);
> +    })cpp")
> +                  .signatures,
> +              ElementsAre(Sig("foo(T, T, T) -> void", {"T", "T", "T"})));
> +
> +  EXPECT_THAT(signatures(R"cpp(
> +    template <class ...T>
> +    void foo(T...);
> +
> +    int main() {
> +      foo<int>(^);
> +    }
> +  )cpp")
> +                  .signatures,
> +              ElementsAre(Sig("foo(T...) -> void", {"T..."})));
> +
> +  // It is debatable whether we should substitute the outer template parameter
> +  // ('T') in that case. Currently we don't substitute it in signature help, but
> +  // do substitute in code complete.
> +  // FIXME: make code complete and signature help consistent, figure out which
> +  // way is better.
> +  EXPECT_THAT(signatures(R"cpp(
> +    template <class T>
> +    struct X {
> +      template <class U>
> +      void foo(T, U);
> +    };
> +
> +    int main() {
> +      X<int>().foo<double>(^)
> +    }
> +  )cpp")
> +                  .signatures,
> +              ElementsAre(Sig("foo(T, U) -> void", {"T", "U"})));
> +}
> +
>  } // namespace
>  } // namespace clangd
>  } // namespace clang
> Index: clang-tools-extra/trunk/clangd/CodeComplete.cpp
> ===================================================================
> --- clang-tools-extra/trunk/clangd/CodeComplete.cpp
> +++ clang-tools-extra/trunk/clangd/CodeComplete.cpp
> @@ -714,7 +714,15 @@
>             "too many arguments");
>      SigHelp.activeParameter = static_cast<int>(CurrentArg);
>      for (unsigned I = 0; I < NumCandidates; ++I) {
> -      const auto &Candidate = Candidates[I];
> +      OverloadCandidate Candidate = Candidates[I];
> +      // We want to avoid showing instantiated signatures, because they may be
> +      // long in some cases (e.g. when 'T' is substituted with 'std::string', we
> +      // would get 'std::basic_string<char>').
> +      if (auto *Func = Candidate.getFunction()) {
> +        if (auto *Pattern = Func->getTemplateInstantiationPattern())
> +          Candidate = OverloadCandidate(Pattern);
> +      }
> +
>        const auto *CCS = Candidate.CreateSignatureString(
>            CurrentArg, S, *Allocator, CCTUInfo, true);
>        assert(CCS && "Expected the CodeCompletionString to be non-null");
>
>
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