| 1 | //===--- LocateSymbol.cpp - Find locations providing a symbol -------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "AnalysisInternal.h" |
| 10 | #include "clang-include-cleaner/Types.h" |
| 11 | #include "clang/AST/Decl.h" |
| 12 | #include "clang/AST/DeclBase.h" |
| 13 | #include "clang/AST/DeclCXX.h" |
| 14 | #include "clang/AST/DeclTemplate.h" |
| 15 | #include "clang/Tooling/Inclusions/StandardLibrary.h" |
| 16 | #include "llvm/Support/Casting.h" |
| 17 | #include <utility> |
| 18 | #include <vector> |
| 19 | |
| 20 | namespace clang::include_cleaner { |
| 21 | namespace { |
| 22 | |
| 23 | template <typename T> Hints completeIfDefinition(T *D) { |
| 24 | return D->isThisDeclarationADefinition() ? Hints::CompleteSymbol |
| 25 | : Hints::None; |
| 26 | } |
| 27 | |
| 28 | Hints declHints(const Decl *D) { |
| 29 | // Definition is only needed for classes and templates for completeness. |
| 30 | if (auto *TD = llvm::dyn_cast<TagDecl>(Val: D)) |
| 31 | return completeIfDefinition(D: TD); |
| 32 | else if (auto *CTD = llvm::dyn_cast<ClassTemplateDecl>(Val: D)) |
| 33 | return completeIfDefinition(D: CTD); |
| 34 | else if (auto *FTD = llvm::dyn_cast<FunctionTemplateDecl>(Val: D)) |
| 35 | return completeIfDefinition(D: FTD); |
| 36 | // Any other declaration is assumed usable. |
| 37 | return Hints::CompleteSymbol; |
| 38 | } |
| 39 | |
| 40 | std::vector<Hinted<SymbolLocation>> locateDecl(const Decl &D) { |
| 41 | std::vector<Hinted<SymbolLocation>> Result; |
| 42 | // FIXME: Should we also provide physical locations? |
| 43 | if (auto SS = tooling::stdlib::Recognizer()(&D)) |
| 44 | return {{*SS, Hints::CompleteSymbol}}; |
| 45 | // FIXME: Signal foreign decls, e.g. a forward declaration not owned by a |
| 46 | // library. Some useful signals could be derived by checking the DeclContext. |
| 47 | // Most incidental forward decls look like: |
| 48 | // namespace clang { |
| 49 | // class SourceManager; // likely an incidental forward decl. |
| 50 | // namespace my_own_ns {} |
| 51 | // } |
| 52 | for (auto *Redecl : D.redecls()) |
| 53 | Result.push_back(x: {Redecl->getLocation(), declHints(D: Redecl)}); |
| 54 | return Result; |
| 55 | } |
| 56 | |
| 57 | std::vector<Hinted<SymbolLocation>> locateMacro(const Macro &M) { |
| 58 | // FIXME: Should we also provide physical locations? |
| 59 | if (auto SS = tooling::stdlib::Symbol::named(Scope: "", Name: M.Name->getName())) |
| 60 | return {{*SS, Hints::CompleteSymbol}}; |
| 61 | return {{M.Definition, Hints::CompleteSymbol}}; |
| 62 | } |
| 63 | } // namespace |
| 64 | |
| 65 | std::vector<Hinted<SymbolLocation>> locateSymbol(const Symbol &S) { |
| 66 | switch (S.kind()) { |
| 67 | case Symbol::Declaration: |
| 68 | return locateDecl(D: S.declaration()); |
| 69 | case Symbol::Macro: |
| 70 | return locateMacro(M: S.macro()); |
| 71 | } |
| 72 | llvm_unreachable("Unknown Symbol::Kind enum"); |
| 73 | } |
| 74 | |
| 75 | } // namespace clang::include_cleaner |
| 76 |