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llvm-project/clang-tools-extra/clangd/XRefs.cpp

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//===--- XRefs.cpp -----------------------------------------------*- C++-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "XRefs.h"
#include "AST.h"
#include "CodeCompletionStrings.h"
#include "FindSymbols.h"
#include "FindTarget.h"
#include "ParsedAST.h"
#include "Protocol.h"
#include "Quality.h"
#include "Selection.h"
#include "SourceCode.h"
#include "URI.h"
#include "index/Index.h"
#include "index/Merge.h"
#include "index/Relation.h"
#include "index/SymbolLocation.h"
#include "support/Logger.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTTypeTraits.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Attrs.inc"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtCXX.h"
#include "clang/AST/Type.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TokenKinds.h"
#include "clang/Index/IndexDataConsumer.h"
#include "clang/Index/IndexSymbol.h"
#include "clang/Index/IndexingAction.h"
#include "clang/Index/IndexingOptions.h"
#include "clang/Index/USRGeneration.h"
#include "clang/Tooling/Syntax/Tokens.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
namespace clang {
namespace clangd {
namespace {
// Returns the single definition of the entity declared by D, if visible.
// In particular:
// - for non-redeclarable kinds (e.g. local vars), return D
// - for kinds that allow multiple definitions (e.g. namespaces), return nullptr
// Kinds of nodes that always return nullptr here will not have definitions
// reported by locateSymbolAt().
const NamedDecl *getDefinition(const NamedDecl *D) {
assert(D);
// Decl has one definition that we can find.
if (const auto *TD = dyn_cast<TagDecl>(D))
return TD->getDefinition();
if (const auto *VD = dyn_cast<VarDecl>(D))
return VD->getDefinition();
if (const auto *FD = dyn_cast<FunctionDecl>(D))
return FD->getDefinition();
// Objective-C classes can have three types of declarations:
//
// - forward declaration: @class MyClass;
// - true declaration (interface definition): @interface MyClass ... @end
// - true definition (implementation): @implementation MyClass ... @end
//
// Objective-C categories are extensions are on classes:
//
// - declaration: @interface MyClass (Ext) ... @end
// - definition: @implementation MyClass (Ext) ... @end
//
// With one special case, a class extension, which is normally used to keep
// some declarations internal to a file without exposing them in a header.
//
// - class extension declaration: @interface MyClass () ... @end
// - which really links to class definition: @implementation MyClass ... @end
if (const auto *ID = dyn_cast<ObjCInterfaceDecl>(D))
return ID->getImplementation();
if (const auto *CD = dyn_cast<ObjCCategoryDecl>(D)) {
if (CD->IsClassExtension()) {
if (const auto *ID = CD->getClassInterface())
return ID->getImplementation();
return nullptr;
}
return CD->getImplementation();
}
// Only a single declaration is allowed.
if (isa<ValueDecl>(D) || isa<TemplateTypeParmDecl>(D) ||
isa<TemplateTemplateParmDecl>(D)) // except cases above
return D;
// Multiple definitions are allowed.
return nullptr; // except cases above
}
void logIfOverflow(const SymbolLocation &Loc) {
if (Loc.Start.hasOverflow() || Loc.End.hasOverflow())
log("Possible overflow in symbol location: {0}", Loc);
}
// Convert a SymbolLocation to LSP's Location.
// TUPath is used to resolve the path of URI.
// FIXME: figure out a good home for it, and share the implementation with
// FindSymbols.
llvm::Optional<Location> toLSPLocation(const SymbolLocation &Loc,
llvm::StringRef TUPath) {
if (!Loc)
return None;
auto Uri = URI::parse(Loc.FileURI);
if (!Uri) {
elog("Could not parse URI {0}: {1}", Loc.FileURI, Uri.takeError());
return None;
}
auto U = URIForFile::fromURI(*Uri, TUPath);
if (!U) {
elog("Could not resolve URI {0}: {1}", Loc.FileURI, U.takeError());
return None;
}
Location LSPLoc;
LSPLoc.uri = std::move(*U);
LSPLoc.range.start.line = Loc.Start.line();
LSPLoc.range.start.character = Loc.Start.column();
LSPLoc.range.end.line = Loc.End.line();
LSPLoc.range.end.character = Loc.End.column();
logIfOverflow(Loc);
return LSPLoc;
}
SymbolLocation toIndexLocation(const Location &Loc, std::string &URIStorage) {
SymbolLocation SymLoc;
URIStorage = Loc.uri.uri();
SymLoc.FileURI = URIStorage.c_str();
SymLoc.Start.setLine(Loc.range.start.line);
SymLoc.Start.setColumn(Loc.range.start.character);
SymLoc.End.setLine(Loc.range.end.line);
SymLoc.End.setColumn(Loc.range.end.character);
return SymLoc;
}
// Returns the preferred location between an AST location and an index location.
SymbolLocation getPreferredLocation(const Location &ASTLoc,
const SymbolLocation &IdxLoc,
std::string &Scratch) {
// Also use a dummy symbol for the index location so that other fields (e.g.
// definition) are not factored into the preference.
Symbol ASTSym, IdxSym;
ASTSym.ID = IdxSym.ID = SymbolID("dummy_id");
ASTSym.CanonicalDeclaration = toIndexLocation(ASTLoc, Scratch);
IdxSym.CanonicalDeclaration = IdxLoc;
auto Merged = mergeSymbol(ASTSym, IdxSym);
return Merged.CanonicalDeclaration;
}
std::vector<const NamedDecl *>
getDeclAtPosition(ParsedAST &AST, SourceLocation Pos, DeclRelationSet Relations,
ASTNodeKind *NodeKind = nullptr) {
unsigned Offset = AST.getSourceManager().getDecomposedSpellingLoc(Pos).second;
std::vector<const NamedDecl *> Result;
SelectionTree::createEach(AST.getASTContext(), AST.getTokens(), Offset,
Offset, [&](SelectionTree ST) {
if (const SelectionTree::Node *N =
ST.commonAncestor()) {
if (NodeKind)
*NodeKind = N->ASTNode.getNodeKind();
llvm::copy(targetDecl(N->ASTNode, Relations),
std::back_inserter(Result));
}
return !Result.empty();
});
return Result;
}
// Expects Loc to be a SpellingLocation, will bail out otherwise as it can't
// figure out a filename.
llvm::Optional<Location> makeLocation(const ASTContext &AST, SourceLocation Loc,
llvm::StringRef TUPath) {
const auto &SM = AST.getSourceManager();
const FileEntry *F = SM.getFileEntryForID(SM.getFileID(Loc));
if (!F)
return None;
auto FilePath = getCanonicalPath(F, SM);
if (!FilePath) {
log("failed to get path!");
return None;
}
Location L;
L.uri = URIForFile::canonicalize(*FilePath, TUPath);
// We call MeasureTokenLength here as TokenBuffer doesn't store spelled tokens
// outside the main file.
auto TokLen = Lexer::MeasureTokenLength(Loc, SM, AST.getLangOpts());
L.range = halfOpenToRange(
SM, CharSourceRange::getCharRange(Loc, Loc.getLocWithOffset(TokLen)));
return L;
}
// Treat #included files as symbols, to enable go-to-definition on them.
llvm::Optional<LocatedSymbol> locateFileReferent(const Position &Pos,
ParsedAST &AST,
llvm::StringRef MainFilePath) {
for (auto &Inc : AST.getIncludeStructure().MainFileIncludes) {
if (!Inc.Resolved.empty() && Inc.HashLine == Pos.line) {
LocatedSymbol File;
File.Name = std::string(llvm::sys::path::filename(Inc.Resolved));
File.PreferredDeclaration = {
URIForFile::canonicalize(Inc.Resolved, MainFilePath), Range{}};
File.Definition = File.PreferredDeclaration;
// We're not going to find any further symbols on #include lines.
return File;
}
}
return llvm::None;
}
// Macros are simple: there's no declaration/definition distinction.
// As a consequence, there's no need to look them up in the index either.
llvm::Optional<LocatedSymbol>
locateMacroReferent(const syntax::Token &TouchedIdentifier, ParsedAST &AST,
llvm::StringRef MainFilePath) {
if (auto M = locateMacroAt(TouchedIdentifier, AST.getPreprocessor())) {
if (auto Loc =
makeLocation(AST.getASTContext(), M->NameLoc, MainFilePath)) {
LocatedSymbol Macro;
Macro.Name = std::string(M->Name);
Macro.PreferredDeclaration = *Loc;
Macro.Definition = Loc;
return Macro;
}
}
return llvm::None;
}
// A wrapper around `Decl::getCanonicalDecl` to support cases where Clang's
// definition of a canonical declaration doesn't match up to what a programmer
// would expect. For example, Objective-C classes can have three types of
// declarations:
//
// - forward declaration(s): @class MyClass;
// - true declaration (interface definition): @interface MyClass ... @end
// - true definition (implementation): @implementation MyClass ... @end
//
// Clang will consider the forward declaration to be the canonical declaration
// because it is first. We actually want the class definition if it is
// available since that is what a programmer would consider the primary
// declaration to be.
const NamedDecl *getPreferredDecl(const NamedDecl *D) {
// FIXME: Canonical declarations of some symbols might refer to built-in
// decls with possibly-invalid source locations (e.g. global new operator).
// In such cases we should pick up a redecl with valid source location
// instead of failing.
D = llvm::cast<NamedDecl>(D->getCanonicalDecl());
// Prefer Objective-C class/protocol definitions over the forward declaration.
if (const auto *ID = dyn_cast<ObjCInterfaceDecl>(D))
if (const auto *DefinitionID = ID->getDefinition())
return DefinitionID;
if (const auto *PD = dyn_cast<ObjCProtocolDecl>(D))
if (const auto *DefinitionID = PD->getDefinition())
return DefinitionID;
return D;
}
// Decls are more complicated.
// The AST contains at least a declaration, maybe a definition.
// These are up-to-date, and so generally preferred over index results.
// We perform a single batch index lookup to find additional definitions.
std::vector<LocatedSymbol>
locateASTReferent(SourceLocation CurLoc, const syntax::Token *TouchedIdentifier,
ParsedAST &AST, llvm::StringRef MainFilePath,
const SymbolIndex *Index, ASTNodeKind *NodeKind) {
const SourceManager &SM = AST.getSourceManager();
// Results follow the order of Symbols.Decls.
std::vector<LocatedSymbol> Result;
// Keep track of SymbolID -> index mapping, to fill in index data later.
llvm::DenseMap<SymbolID, size_t> ResultIndex;
auto AddResultDecl = [&](const NamedDecl *D) {
D = getPreferredDecl(D);
auto Loc =
makeLocation(AST.getASTContext(), nameLocation(*D, SM), MainFilePath);
if (!Loc)
return;
Result.emplace_back();
Result.back().Name = printName(AST.getASTContext(), *D);
Result.back().PreferredDeclaration = *Loc;
if (const NamedDecl *Def = getDefinition(D))
Result.back().Definition = makeLocation(
AST.getASTContext(), nameLocation(*Def, SM), MainFilePath);
// Record SymbolID for index lookup later.
if (auto ID = getSymbolID(D))
ResultIndex[*ID] = Result.size() - 1;
};
// Emit all symbol locations (declaration or definition) from AST.
DeclRelationSet Relations =
DeclRelation::TemplatePattern | DeclRelation::Alias;
for (const NamedDecl *D :
getDeclAtPosition(AST, CurLoc, Relations, NodeKind)) {
// Special case: void foo() ^override: jump to the overridden method.
if (const auto *CMD = llvm::dyn_cast<CXXMethodDecl>(D)) {
const InheritableAttr *Attr = D->getAttr<OverrideAttr>();
if (!Attr)
Attr = D->getAttr<FinalAttr>();
if (Attr && TouchedIdentifier &&
SM.getSpellingLoc(Attr->getLocation()) ==
TouchedIdentifier->location()) {
// We may be overridding multiple methods - offer them all.
for (const NamedDecl *ND : CMD->overridden_methods())
AddResultDecl(ND);
continue;
}
}
// Special case: the point of declaration of a template specialization,
// it's more useful to navigate to the template declaration.
if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(D)) {
if (TouchedIdentifier &&
D->getLocation() == TouchedIdentifier->location()) {
AddResultDecl(CTSD->getSpecializedTemplate());
continue;
}
}
// Give the underlying decl if navigation is triggered on a non-renaming
// alias.
if (llvm::isa<UsingDecl>(D) || llvm::isa<UnresolvedUsingValueDecl>(D)) {
// FIXME: address more complicated cases. TargetDecl(... Underlying) gives
// all overload candidates, we only want the targeted one if the cursor is
// on an using-alias usage, workround it with getDeclAtPosition.
llvm::for_each(
getDeclAtPosition(AST, CurLoc, DeclRelation::Underlying, NodeKind),
[&](const NamedDecl *UD) { AddResultDecl(UD); });
continue;
}
// Special case: if the class name is selected, also map Objective-C
// categories and category implementations back to their class interface.
//
// Since `TouchedIdentifier` might refer to the `ObjCCategoryImplDecl`
// instead of the `ObjCCategoryDecl` we intentionally check the contents
// of the locs when checking for class name equivalence.
if (const auto *CD = dyn_cast<ObjCCategoryDecl>(D))
if (const auto *ID = CD->getClassInterface())
if (TouchedIdentifier &&
(CD->getLocation() == TouchedIdentifier->location() ||
ID->getName() == TouchedIdentifier->text(SM)))
AddResultDecl(ID);
// Otherwise the target declaration is the right one.
AddResultDecl(D);
}
// Now query the index for all Symbol IDs we found in the AST.
if (Index && !ResultIndex.empty()) {
LookupRequest QueryRequest;
for (auto It : ResultIndex)
QueryRequest.IDs.insert(It.first);
std::string Scratch;
Index->lookup(QueryRequest, [&](const Symbol &Sym) {
auto &R = Result[ResultIndex.lookup(Sym.ID)];
if (R.Definition) { // from AST
// Special case: if the AST yielded a definition, then it may not be
// the right *declaration*. Prefer the one from the index.
if (auto Loc = toLSPLocation(Sym.CanonicalDeclaration, MainFilePath))
R.PreferredDeclaration = *Loc;
// We might still prefer the definition from the index, e.g. for
// generated symbols.
if (auto Loc = toLSPLocation(
getPreferredLocation(*R.Definition, Sym.Definition, Scratch),
MainFilePath))
R.Definition = *Loc;
} else {
R.Definition = toLSPLocation(Sym.Definition, MainFilePath);
// Use merge logic to choose AST or index declaration.
if (auto Loc = toLSPLocation(
getPreferredLocation(R.PreferredDeclaration,
Sym.CanonicalDeclaration, Scratch),
MainFilePath))
R.PreferredDeclaration = *Loc;
}
});
}
return Result;
}
bool tokenSpelledAt(SourceLocation SpellingLoc, const syntax::TokenBuffer &TB) {
auto ExpandedTokens = TB.expandedTokens(
TB.sourceManager().getMacroArgExpandedLocation(SpellingLoc));
return !ExpandedTokens.empty();
}
llvm::StringRef sourcePrefix(SourceLocation Loc, const SourceManager &SM) {
auto D = SM.getDecomposedLoc(Loc);
bool Invalid = false;
llvm::StringRef Buf = SM.getBufferData(D.first, &Invalid);
if (Invalid || D.second > Buf.size())
return "";
return Buf.substr(0, D.second);
}
bool isDependentName(ASTNodeKind NodeKind) {
return NodeKind.isSame(ASTNodeKind::getFromNodeKind<OverloadExpr>()) ||
NodeKind.isSame(
ASTNodeKind::getFromNodeKind<CXXDependentScopeMemberExpr>()) ||
NodeKind.isSame(
ASTNodeKind::getFromNodeKind<DependentScopeDeclRefExpr>());
}
} // namespace
std::vector<LocatedSymbol>
locateSymbolTextually(const SpelledWord &Word, ParsedAST &AST,
const SymbolIndex *Index, const std::string &MainFilePath,
ASTNodeKind NodeKind) {
// Don't use heuristics if this is a real identifier, or not an
// identifier.
// Exception: dependent names, because those may have useful textual
// matches that AST-based heuristics cannot find.
if ((Word.ExpandedToken && !isDependentName(NodeKind)) ||
!Word.LikelyIdentifier || !Index)
return {};
// We don't want to handle words in string literals. (It'd be nice to list
// *allowed* token kinds explicitly, but comment Tokens aren't retained).
if (Word.PartOfSpelledToken &&
isStringLiteral(Word.PartOfSpelledToken->kind()))
return {};
const auto &SM = AST.getSourceManager();
// Look up the selected word in the index.
FuzzyFindRequest Req;
Req.Query = Word.Text.str();
Req.ProximityPaths = {MainFilePath};
// Find the namespaces to query by lexing the file.
Req.Scopes =
visibleNamespaces(sourcePrefix(Word.Location, SM), AST.getLangOpts());
// FIXME: For extra strictness, consider AnyScope=false.
Req.AnyScope = true;
// We limit the results to 3 further below. This limit is to avoid fetching
// too much data, while still likely having enough for 3 results to remain
// after additional filtering.
Req.Limit = 10;
bool TooMany = false;
using ScoredLocatedSymbol = std::pair<float, LocatedSymbol>;
std::vector<ScoredLocatedSymbol> ScoredResults;
Index->fuzzyFind(Req, [&](const Symbol &Sym) {
// Only consider exact name matches, including case.
// This is to avoid too many false positives.
// We could relax this in the future (e.g. to allow for typos) if we make
// the query more accurate by other means.
if (Sym.Name != Word.Text)
return;
// Exclude constructor results. They have the same name as the class,
// but we don't have enough context to prefer them over the class.
if (Sym.SymInfo.Kind == index::SymbolKind::Constructor)
return;
auto MaybeDeclLoc =
indexToLSPLocation(Sym.CanonicalDeclaration, MainFilePath);
if (!MaybeDeclLoc) {
log("locateSymbolNamedTextuallyAt: {0}", MaybeDeclLoc.takeError());
return;
}
LocatedSymbol Located;
Located.PreferredDeclaration = *MaybeDeclLoc;
Located.Name = (Sym.Name + Sym.TemplateSpecializationArgs).str();
if (Sym.Definition) {
auto MaybeDefLoc = indexToLSPLocation(Sym.Definition, MainFilePath);
if (!MaybeDefLoc) {
log("locateSymbolNamedTextuallyAt: {0}", MaybeDefLoc.takeError());
return;
}
Located.PreferredDeclaration = *MaybeDefLoc;
Located.Definition = *MaybeDefLoc;
}
if (ScoredResults.size() >= 3) {
// If we have more than 3 results, don't return anything,
// as confidence is too low.
// FIXME: Alternatively, try a stricter query?
TooMany = true;
return;
}
SymbolQualitySignals Quality;
Quality.merge(Sym);
SymbolRelevanceSignals Relevance;
Relevance.Name = Sym.Name;
Relevance.Query = SymbolRelevanceSignals::Generic;
Relevance.merge(Sym);
auto Score = evaluateSymbolAndRelevance(Quality.evaluateHeuristics(),
Relevance.evaluateHeuristics());
dlog("locateSymbolNamedTextuallyAt: {0}{1} = {2}\n{3}{4}\n", Sym.Scope,
Sym.Name, Score, Quality, Relevance);
ScoredResults.push_back({Score, std::move(Located)});
});
if (TooMany) {
vlog("Heuristic index lookup for {0} returned too many candidates, ignored",
Word.Text);
return {};
}
llvm::sort(ScoredResults,
[](const ScoredLocatedSymbol &A, const ScoredLocatedSymbol &B) {
return A.first > B.first;
});
std::vector<LocatedSymbol> Results;
for (auto &Res : std::move(ScoredResults))
Results.push_back(std::move(Res.second));
if (Results.empty())
vlog("No heuristic index definition for {0}", Word.Text);
else
log("Found definition heuristically in index for {0}", Word.Text);
return Results;
}
const syntax::Token *findNearbyIdentifier(const SpelledWord &Word,
const syntax::TokenBuffer &TB) {
// Don't use heuristics if this is a real identifier.
// Unlikely identifiers are OK if they were used as identifiers nearby.
if (Word.ExpandedToken)
return nullptr;
// We don't want to handle words in string literals. (It'd be nice to list
// *allowed* token kinds explicitly, but comment Tokens aren't retained).
if (Word.PartOfSpelledToken &&
isStringLiteral(Word.PartOfSpelledToken->kind()))
return {};
const SourceManager &SM = TB.sourceManager();
// We prefer the closest possible token, line-wise. Backwards is penalized.
// Ties are implicitly broken by traversal order (first-one-wins).
auto File = SM.getFileID(Word.Location);
unsigned WordLine = SM.getSpellingLineNumber(Word.Location);
auto Cost = [&](SourceLocation Loc) -> unsigned {
assert(SM.getFileID(Loc) == File && "spelled token in wrong file?");
unsigned Line = SM.getSpellingLineNumber(Loc);
return Line >= WordLine ? Line - WordLine : 2 * (WordLine - Line);
};
const syntax::Token *BestTok = nullptr;
unsigned BestCost = -1;
// Search bounds are based on word length:
// - forward: 2^N lines
// - backward: 2^(N-1) lines.
unsigned MaxDistance =
1U << std::min<unsigned>(Word.Text.size(),
std::numeric_limits<unsigned>::digits - 1);
// Line number for SM.translateLineCol() should be one-based, also
// SM.translateLineCol() can handle line number greater than
// number of lines in the file.
// - LineMin = max(1, WordLine + 1 - 2^(N-1))
// - LineMax = WordLine + 1 + 2^N
unsigned LineMin =
WordLine + 1 <= MaxDistance / 2 ? 1 : WordLine + 1 - MaxDistance / 2;
unsigned LineMax = WordLine + 1 + MaxDistance;
SourceLocation LocMin = SM.translateLineCol(File, LineMin, 1);
assert(LocMin.isValid());
SourceLocation LocMax = SM.translateLineCol(File, LineMax, 1);
assert(LocMax.isValid());
// Updates BestTok and BestCost if Tok is a good candidate.
// May return true if the cost is too high for this token.
auto Consider = [&](const syntax::Token &Tok) {
if (Tok.location() < LocMin || Tok.location() > LocMax)
return true; // we are too far from the word, break the outer loop.
if (!(Tok.kind() == tok::identifier && Tok.text(SM) == Word.Text))
return false;
// No point guessing the same location we started with.
if (Tok.location() == Word.Location)
return false;
// We've done cheap checks, compute cost so we can break the caller's loop.
unsigned TokCost = Cost(Tok.location());
if (TokCost >= BestCost)
return true; // causes the outer loop to break.
// Allow locations that might be part of the AST, and macros (even if empty)
// but not things like disabled preprocessor sections.
if (!(tokenSpelledAt(Tok.location(), TB) || TB.expansionStartingAt(&Tok)))
return false;
// We already verified this token is an improvement.
BestCost = TokCost;
BestTok = &Tok;
return false;
};
auto SpelledTokens = TB.spelledTokens(File);
// Find where the word occurred in the token stream, to search forward & back.
auto *I = llvm::partition_point(SpelledTokens, [&](const syntax::Token &T) {
assert(SM.getFileID(T.location()) == SM.getFileID(Word.Location));
return T.location() < Word.Location; // Comparison OK: same file.
});
// Search for matches after the cursor.
for (const syntax::Token &Tok : llvm::makeArrayRef(I, SpelledTokens.end()))
if (Consider(Tok))
break; // costs of later tokens are greater...
// Search for matches before the cursor.
for (const syntax::Token &Tok :
llvm::reverse(llvm::makeArrayRef(SpelledTokens.begin(), I)))
if (Consider(Tok))
break;
if (BestTok)
vlog(
"Word {0} under cursor {1} isn't a token (after PP), trying nearby {2}",
Word.Text, Word.Location.printToString(SM),
BestTok->location().printToString(SM));
return BestTok;
}
std::vector<LocatedSymbol> locateSymbolAt(ParsedAST &AST, Position Pos,
const SymbolIndex *Index) {
const auto &SM = AST.getSourceManager();
auto MainFilePath =
getCanonicalPath(SM.getFileEntryForID(SM.getMainFileID()), SM);
if (!MainFilePath) {
elog("Failed to get a path for the main file, so no references");
return {};
}
if (auto File = locateFileReferent(Pos, AST, *MainFilePath))
return {std::move(*File)};
auto CurLoc = sourceLocationInMainFile(SM, Pos);
if (!CurLoc) {
elog("locateSymbolAt failed to convert position to source location: {0}",
CurLoc.takeError());
return {};
}
const syntax::Token *TouchedIdentifier =
syntax::spelledIdentifierTouching(*CurLoc, AST.getTokens());
if (TouchedIdentifier)
if (auto Macro =
locateMacroReferent(*TouchedIdentifier, AST, *MainFilePath))
// Don't look at the AST or index if we have a macro result.
// (We'd just return declarations referenced from the macro's
// expansion.)
return {*std::move(Macro)};
ASTNodeKind NodeKind;
auto ASTResults = locateASTReferent(*CurLoc, TouchedIdentifier, AST,
*MainFilePath, Index, &NodeKind);
if (!ASTResults.empty())
return ASTResults;
// If the cursor can't be resolved directly, try fallback strategies.
auto Word =
SpelledWord::touching(*CurLoc, AST.getTokens(), AST.getLangOpts());
if (Word) {
// Is the same word nearby a real identifier that might refer to something?
if (const syntax::Token *NearbyIdent =
findNearbyIdentifier(*Word, AST.getTokens())) {
if (auto Macro = locateMacroReferent(*NearbyIdent, AST, *MainFilePath)) {
log("Found macro definition heuristically using nearby identifier {0}",
Word->Text);
return {*std::move(Macro)};
}
ASTResults =
locateASTReferent(NearbyIdent->location(), NearbyIdent, AST,
*MainFilePath, Index, /*NodeKind=*/nullptr);
if (!ASTResults.empty()) {
log("Found definition heuristically using nearby identifier {0}",
NearbyIdent->text(SM));
return ASTResults;
} else {
vlog("No definition found using nearby identifier {0} at {1}",
Word->Text, Word->Location.printToString(SM));
}
}
// No nearby word, or it didn't refer to anything either. Try the index.
auto TextualResults =
locateSymbolTextually(*Word, AST, Index, *MainFilePath, NodeKind);
if (!TextualResults.empty())
return TextualResults;
}
return {};
}
std::vector<DocumentLink> getDocumentLinks(ParsedAST &AST) {
const auto &SM = AST.getSourceManager();
auto MainFilePath =
getCanonicalPath(SM.getFileEntryForID(SM.getMainFileID()), SM);
if (!MainFilePath) {
elog("Failed to get a path for the main file, so no links");
return {};
}
std::vector<DocumentLink> Result;
for (auto &Inc : AST.getIncludeStructure().MainFileIncludes) {
if (Inc.Resolved.empty())
continue;
auto HashLoc = SM.getComposedLoc(SM.getMainFileID(), Inc.HashOffset);
const auto *HashTok = AST.getTokens().spelledTokenAt(HashLoc);
assert(HashTok && "got inclusion at wrong offset");
const auto *IncludeTok = std::next(HashTok);
const auto *FileTok = std::next(IncludeTok);
// FileTok->range is not sufficient here, as raw lexing wouldn't yield
// correct tokens for angled filenames. Hence we explicitly use
// Inc.Written's length.
auto FileRange =
syntax::FileRange(SM, FileTok->location(), Inc.Written.length())
.toCharRange(SM);
Result.push_back(
DocumentLink({halfOpenToRange(SM, FileRange),
URIForFile::canonicalize(Inc.Resolved, *MainFilePath)}));
}
return Result;
}
namespace {
/// Collects references to symbols within the main file.
class ReferenceFinder : public index::IndexDataConsumer {
public:
struct Reference {
syntax::Token SpelledTok;
index::SymbolRoleSet Role;
Range range(const SourceManager &SM) const {
return halfOpenToRange(SM, SpelledTok.range(SM).toCharRange(SM));
}
};
ReferenceFinder(const ParsedAST &AST,
const std::vector<const NamedDecl *> &TargetDecls)
: AST(AST) {
for (const NamedDecl *D : TargetDecls)
CanonicalTargets.insert(D->getCanonicalDecl());
}
std::vector<Reference> take() && {
llvm::sort(References, [](const Reference &L, const Reference &R) {
auto LTok = L.SpelledTok.location();
auto RTok = R.SpelledTok.location();
return std::tie(LTok, L.Role) < std::tie(RTok, R.Role);
});
// We sometimes see duplicates when parts of the AST get traversed twice.
References.erase(std::unique(References.begin(), References.end(),
[](const Reference &L, const Reference &R) {
auto LTok = L.SpelledTok.location();
auto RTok = R.SpelledTok.location();
return std::tie(LTok, L.Role) ==
std::tie(RTok, R.Role);
}),
References.end());
return std::move(References);
}
bool
handleDeclOccurrence(const Decl *D, index::SymbolRoleSet Roles,
llvm::ArrayRef<index::SymbolRelation> Relations,
SourceLocation Loc,
index::IndexDataConsumer::ASTNodeInfo ASTNode) override {
assert(D->isCanonicalDecl() && "expect D to be a canonical declaration");
const SourceManager &SM = AST.getSourceManager();
if (!CanonicalTargets.count(D) || !isInsideMainFile(Loc, SM))
return true;
const auto &TB = AST.getTokens();
Loc = SM.getFileLoc(Loc);
if (const auto *Tok = TB.spelledTokenAt(Loc))
References.push_back({*Tok, Roles});
return true;
}
private:
llvm::SmallSet<const Decl *, 4> CanonicalTargets;
std::vector<Reference> References;
const ParsedAST &AST;
};
std::vector<ReferenceFinder::Reference>
findRefs(const std::vector<const NamedDecl *> &Decls, ParsedAST &AST) {
ReferenceFinder RefFinder(AST, Decls);
index::IndexingOptions IndexOpts;
IndexOpts.SystemSymbolFilter =
index::IndexingOptions::SystemSymbolFilterKind::All;
IndexOpts.IndexFunctionLocals = true;
IndexOpts.IndexParametersInDeclarations = true;
IndexOpts.IndexTemplateParameters = true;
indexTopLevelDecls(AST.getASTContext(), AST.getPreprocessor(),
AST.getLocalTopLevelDecls(), RefFinder, IndexOpts);
return std::move(RefFinder).take();
}
const Stmt *getFunctionBody(DynTypedNode N) {
if (const auto *FD = N.get<FunctionDecl>())
return FD->getBody();
if (const auto *FD = N.get<BlockDecl>())
return FD->getBody();
if (const auto *FD = N.get<LambdaExpr>())
return FD->getBody();
if (const auto *FD = N.get<ObjCMethodDecl>())
return FD->getBody();
return nullptr;
}
const Stmt *getLoopBody(DynTypedNode N) {
if (const auto *LS = N.get<ForStmt>())
return LS->getBody();
if (const auto *LS = N.get<CXXForRangeStmt>())
return LS->getBody();
if (const auto *LS = N.get<WhileStmt>())
return LS->getBody();
if (const auto *LS = N.get<DoStmt>())
return LS->getBody();
return nullptr;
}
// AST traversal to highlight control flow statements under some root.
// Once we hit further control flow we prune the tree (or at least restrict
// what we highlight) so we capture e.g. breaks from the outer loop only.
class FindControlFlow : public RecursiveASTVisitor<FindControlFlow> {
// Types of control-flow statements we might highlight.
enum Target {
Break = 1,
Continue = 2,
Return = 4,
Case = 8,
Throw = 16,
Goto = 32,
All = Break | Continue | Return | Case | Throw | Goto,
};
int Ignore = 0; // bitmask of Target - what are we *not* highlighting?
SourceRange Bounds; // Half-open, restricts reported targets.
std::vector<SourceLocation> &Result;
const SourceManager &SM;
// Masks out targets for a traversal into D.
// Traverses the subtree using Delegate() if any targets remain.
template <typename Func>
bool filterAndTraverse(DynTypedNode D, const Func &Delegate) {
auto RestoreIgnore = llvm::make_scope_exit(
[OldIgnore(Ignore), this] { Ignore = OldIgnore; });
if (getFunctionBody(D))
Ignore = All;
else if (getLoopBody(D))
Ignore |= Continue | Break;
else if (D.get<SwitchStmt>())
Ignore |= Break | Case;
// Prune tree if we're not looking for anything.
return (Ignore == All) ? true : Delegate();
}
void found(Target T, SourceLocation Loc) {
if (T & Ignore)
return;
if (SM.isBeforeInTranslationUnit(Loc, Bounds.getBegin()) ||
SM.isBeforeInTranslationUnit(Bounds.getEnd(), Loc))
return;
Result.push_back(Loc);
}
public:
FindControlFlow(SourceRange Bounds, std::vector<SourceLocation> &Result,
const SourceManager &SM)
: Bounds(Bounds), Result(Result), SM(SM) {}
// When traversing function or loops, limit targets to those that still
// refer to the original root.
bool TraverseDecl(Decl *D) {
return !D || filterAndTraverse(DynTypedNode::create(*D), [&] {
return RecursiveASTVisitor::TraverseDecl(D);
});
}
bool TraverseStmt(Stmt *S) {
return !S || filterAndTraverse(DynTypedNode::create(*S), [&] {
return RecursiveASTVisitor::TraverseStmt(S);
});
}
// Add leaves that we found and want.
bool VisitReturnStmt(ReturnStmt *R) {
found(Return, R->getReturnLoc());
return true;
}
bool VisitBreakStmt(BreakStmt *B) {
found(Break, B->getBreakLoc());
return true;
}
bool VisitContinueStmt(ContinueStmt *C) {
found(Continue, C->getContinueLoc());
return true;
}
bool VisitSwitchCase(SwitchCase *C) {
found(Case, C->getKeywordLoc());
return true;
}
bool VisitCXXThrowExpr(CXXThrowExpr *T) {
found(Throw, T->getThrowLoc());
return true;
}
bool VisitGotoStmt(GotoStmt *G) {
// Goto is interesting if its target is outside the root.
if (const auto *LD = G->getLabel()) {
if (SM.isBeforeInTranslationUnit(LD->getLocation(), Bounds.getBegin()) ||
SM.isBeforeInTranslationUnit(Bounds.getEnd(), LD->getLocation()))
found(Goto, G->getGotoLoc());
}
return true;
}
};
// Given a location within a switch statement, return the half-open range that
// covers the case it's contained in.
// We treat `case X: case Y: ...` as one case, and assume no other fallthrough.
SourceRange findCaseBounds(const SwitchStmt &Switch, SourceLocation Loc,
const SourceManager &SM) {
// Cases are not stored in order, sort them first.
// (In fact they seem to be stored in reverse order, don't rely on this)
std::vector<const SwitchCase *> Cases;
for (const SwitchCase *Case = Switch.getSwitchCaseList(); Case;
Case = Case->getNextSwitchCase())
Cases.push_back(Case);
llvm::sort(Cases, [&](const SwitchCase *L, const SwitchCase *R) {
return SM.isBeforeInTranslationUnit(L->getKeywordLoc(), R->getKeywordLoc());
});
// Find the first case after the target location, the end of our range.
auto CaseAfter = llvm::partition_point(Cases, [&](const SwitchCase *C) {
return !SM.isBeforeInTranslationUnit(Loc, C->getKeywordLoc());
});
SourceLocation End = CaseAfter == Cases.end() ? Switch.getEndLoc()
: (*CaseAfter)->getKeywordLoc();
// Our target can be before the first case - cases are optional!
if (CaseAfter == Cases.begin())
return SourceRange(Switch.getBeginLoc(), End);
// The start of our range is usually the previous case, but...
auto CaseBefore = std::prev(CaseAfter);
// ... rewind CaseBefore to the first in a `case A: case B: ...` sequence.
while (CaseBefore != Cases.begin() &&
(*std::prev(CaseBefore))->getSubStmt() == *CaseBefore)
--CaseBefore;
return SourceRange((*CaseBefore)->getKeywordLoc(), End);
}
// Returns the locations of control flow statements related to N. e.g.:
// for => branches: break/continue/return/throw
// break => controlling loop (forwhile/do), and its related control flow
// return => all returns/throws from the same function
// When an inner block is selected, we include branches bound to outer blocks
// as these are exits from the inner block. e.g. return in a for loop.
// FIXME: We don't analyze catch blocks, throw is treated the same as return.
std::vector<SourceLocation> relatedControlFlow(const SelectionTree::Node &N) {
const SourceManager &SM =
N.getDeclContext().getParentASTContext().getSourceManager();
std::vector<SourceLocation> Result;
// First, check if we're at a node that can resolve to a root.
enum class Cur { None, Break, Continue, Return, Case, Throw } Cursor;
if (N.ASTNode.get<BreakStmt>()) {
Cursor = Cur::Break;
} else if (N.ASTNode.get<ContinueStmt>()) {
Cursor = Cur::Continue;
} else if (N.ASTNode.get<ReturnStmt>()) {
Cursor = Cur::Return;
} else if (N.ASTNode.get<CXXThrowExpr>()) {
Cursor = Cur::Throw;
} else if (N.ASTNode.get<SwitchCase>()) {
Cursor = Cur::Case;
} else if (const GotoStmt *GS = N.ASTNode.get<GotoStmt>()) {
// We don't know what root to associate with, but highlight the goto/label.
Result.push_back(GS->getGotoLoc());
if (const auto *LD = GS->getLabel())
Result.push_back(LD->getLocation());
Cursor = Cur::None;
} else {
Cursor = Cur::None;
}
const Stmt *Root = nullptr; // Loop or function body to traverse.
SourceRange Bounds;
// Look up the tree for a root (or just at this node if we didn't find a leaf)
for (const auto *P = &N; P; P = P->Parent) {
// return associates with enclosing function
if (const Stmt *FunctionBody = getFunctionBody(P->ASTNode)) {
if (Cursor == Cur::Return || Cursor == Cur::Throw) {
Root = FunctionBody;
}
break; // other leaves don't cross functions.
}
// break/continue associate with enclosing loop.
if (const Stmt *LoopBody = getLoopBody(P->ASTNode)) {
if (Cursor == Cur::None || Cursor == Cur::Break ||
Cursor == Cur::Continue) {
Root = LoopBody;
// Highlight the loop keyword itself.
// FIXME: for do-while, this only covers the `do`..
Result.push_back(P->ASTNode.getSourceRange().getBegin());
break;
}
}
// For switches, users think of case statements as control flow blocks.
// We highlight only occurrences surrounded by the same case.
// We don't detect fallthrough (other than 'case X, case Y').
if (const auto *SS = P->ASTNode.get<SwitchStmt>()) {
if (Cursor == Cur::Break || Cursor == Cur::Case) {
Result.push_back(SS->getSwitchLoc()); // Highlight the switch.
Root = SS->getBody();
// Limit to enclosing case, if there is one.
Bounds = findCaseBounds(*SS, N.ASTNode.getSourceRange().getBegin(), SM);
break;
}
}
// If we didn't start at some interesting node, we're done.
if (Cursor == Cur::None)
break;
}
if (Root) {
if (!Bounds.isValid())
Bounds = Root->getSourceRange();
FindControlFlow(Bounds, Result, SM).TraverseStmt(const_cast<Stmt *>(Root));
}
return Result;
}
DocumentHighlight toHighlight(const ReferenceFinder::Reference &Ref,
const SourceManager &SM) {
DocumentHighlight DH;
DH.range = Ref.range(SM);
if (Ref.Role & index::SymbolRoleSet(index::SymbolRole::Write))
DH.kind = DocumentHighlightKind::Write;
else if (Ref.Role & index::SymbolRoleSet(index::SymbolRole::Read))
DH.kind = DocumentHighlightKind::Read;
else
DH.kind = DocumentHighlightKind::Text;
return DH;
}
llvm::Optional<DocumentHighlight> toHighlight(SourceLocation Loc,
const syntax::TokenBuffer &TB) {
Loc = TB.sourceManager().getFileLoc(Loc);
if (const auto *Tok = TB.spelledTokenAt(Loc)) {
DocumentHighlight Result;
Result.range = halfOpenToRange(
TB.sourceManager(),
CharSourceRange::getCharRange(Tok->location(), Tok->endLocation()));
return Result;
}
return llvm::None;
}
} // namespace
std::vector<DocumentHighlight> findDocumentHighlights(ParsedAST &AST,
Position Pos) {
const SourceManager &SM = AST.getSourceManager();
// FIXME: show references to macro within file?
auto CurLoc = sourceLocationInMainFile(SM, Pos);
if (!CurLoc) {
llvm::consumeError(CurLoc.takeError());
return {};
}
std::vector<DocumentHighlight> Result;
auto TryTree = [&](SelectionTree ST) {
if (const SelectionTree::Node *N = ST.commonAncestor()) {
DeclRelationSet Relations =
DeclRelation::TemplatePattern | DeclRelation::Alias;
auto Decls = targetDecl(N->ASTNode, Relations);
if (!Decls.empty()) {
// FIXME: we may get multiple DocumentHighlights with the same location
// and different kinds, deduplicate them.
for (const auto &Ref : findRefs({Decls.begin(), Decls.end()}, AST))
Result.push_back(toHighlight(Ref, SM));
return true;
}
auto ControlFlow = relatedControlFlow(*N);
if (!ControlFlow.empty()) {
for (SourceLocation Loc : ControlFlow)
if (auto Highlight = toHighlight(Loc, AST.getTokens()))
Result.push_back(std::move(*Highlight));
return true;
}
}
return false;
};
unsigned Offset =
AST.getSourceManager().getDecomposedSpellingLoc(*CurLoc).second;
SelectionTree::createEach(AST.getASTContext(), AST.getTokens(), Offset,
Offset, TryTree);
return Result;
}
ReferencesResult findReferences(ParsedAST &AST, Position Pos, uint32_t Limit,
const SymbolIndex *Index) {
if (!Limit)
Limit = std::numeric_limits<uint32_t>::max();
ReferencesResult Results;
const SourceManager &SM = AST.getSourceManager();
auto MainFilePath =
getCanonicalPath(SM.getFileEntryForID(SM.getMainFileID()), SM);
if (!MainFilePath) {
elog("Failed to get a path for the main file, so no references");
return Results;
}
auto URIMainFile = URIForFile::canonicalize(*MainFilePath, *MainFilePath);
auto CurLoc = sourceLocationInMainFile(SM, Pos);
if (!CurLoc) {
llvm::consumeError(CurLoc.takeError());
return {};
}
llvm::Optional<DefinedMacro> Macro;
if (const auto *IdentifierAtCursor =
syntax::spelledIdentifierTouching(*CurLoc, AST.getTokens())) {
Macro = locateMacroAt(*IdentifierAtCursor, AST.getPreprocessor());
}
RefsRequest Req;
if (Macro) {
// Handle references to macro.
if (auto MacroSID = getSymbolID(Macro->Name, Macro->Info, SM)) {
// Collect macro references from main file.
const auto &IDToRefs = AST.getMacros().MacroRefs;
auto Refs = IDToRefs.find(*MacroSID);
if (Refs != IDToRefs.end()) {
for (const auto &Ref : Refs->second) {
Location Result;
Result.range = Ref;
Result.uri = URIMainFile;
Results.References.push_back(std::move(Result));
}
}
Req.IDs.insert(*MacroSID);
}
} else {
// Handle references to Decls.
DeclRelationSet Relations =
DeclRelation::TemplatePattern | DeclRelation::Alias;
std::vector<const NamedDecl *> Decls =
getDeclAtPosition(AST, *CurLoc, Relations);
std::vector<const NamedDecl *> NonrenamingAliasUnderlyingDecls;
// If the results include a *non-renaming* alias, get its
// underlying decls as well. (See similar logic in locateASTReferent()).
for (const NamedDecl *D : Decls) {
if (llvm::isa<UsingDecl>(D) || llvm::isa<UnresolvedUsingValueDecl>(D)) {
for (const NamedDecl *AD :
getDeclAtPosition(AST, *CurLoc, DeclRelation::Underlying))
NonrenamingAliasUnderlyingDecls.push_back(AD);
}
}
llvm::copy(NonrenamingAliasUnderlyingDecls, std::back_inserter(Decls));
// We traverse the AST to find references in the main file.
auto MainFileRefs = findRefs(Decls, AST);
// We may get multiple refs with the same location and different Roles, as
// cross-reference is only interested in locations, we deduplicate them
// by the location to avoid emitting duplicated locations.
MainFileRefs.erase(std::unique(MainFileRefs.begin(), MainFileRefs.end(),
[](const ReferenceFinder::Reference &L,
const ReferenceFinder::Reference &R) {
return L.SpelledTok.location() ==
R.SpelledTok.location();
}),
MainFileRefs.end());
for (const auto &Ref : MainFileRefs) {
Location Result;
Result.range = Ref.range(SM);
Result.uri = URIMainFile;
Results.References.push_back(std::move(Result));
}
if (Index && Results.References.size() <= Limit) {
for (const Decl *D : Decls) {
// Not all symbols can be referenced from outside (e.g.
// function-locals).
// TODO: we could skip TU-scoped symbols here (e.g. static functions) if
// we know this file isn't a header. The details might be tricky.
if (D->getParentFunctionOrMethod())
continue;
if (auto ID = getSymbolID(D))
Req.IDs.insert(*ID);
}
}
}
// Now query the index for references from other files.
if (!Req.IDs.empty() && Index && Results.References.size() <= Limit) {
Req.Limit = Limit;
Results.HasMore |= Index->refs(Req, [&](const Ref &R) {
// No need to continue process if we reach the limit.
if (Results.References.size() > Limit)
return;
auto LSPLoc = toLSPLocation(R.Location, *MainFilePath);
// Avoid indexed results for the main file - the AST is authoritative.
if (!LSPLoc || LSPLoc->uri.file() == *MainFilePath)
return;
Results.References.push_back(std::move(*LSPLoc));
});
}
if (Results.References.size() > Limit) {
Results.HasMore = true;
Results.References.resize(Limit);
}
return Results;
}
std::vector<SymbolDetails> getSymbolInfo(ParsedAST &AST, Position Pos) {
const SourceManager &SM = AST.getSourceManager();
auto CurLoc = sourceLocationInMainFile(SM, Pos);
if (!CurLoc) {
llvm::consumeError(CurLoc.takeError());
return {};
}
std::vector<SymbolDetails> Results;
// We also want the targets of using-decls, so we include
// DeclRelation::Underlying.
DeclRelationSet Relations = DeclRelation::TemplatePattern |
DeclRelation::Alias | DeclRelation::Underlying;
for (const NamedDecl *D : getDeclAtPosition(AST, *CurLoc, Relations)) {
SymbolDetails NewSymbol;
std::string QName = printQualifiedName(*D);
auto SplitQName = splitQualifiedName(QName);
NewSymbol.containerName = std::string(SplitQName.first);
NewSymbol.name = std::string(SplitQName.second);
if (NewSymbol.containerName.empty()) {
if (const auto *ParentND =
dyn_cast_or_null<NamedDecl>(D->getDeclContext()))
NewSymbol.containerName = printQualifiedName(*ParentND);
}
llvm::SmallString<32> USR;
if (!index::generateUSRForDecl(D, USR)) {
NewSymbol.USR = std::string(USR.str());
NewSymbol.ID = SymbolID(NewSymbol.USR);
}
Results.push_back(std::move(NewSymbol));
}
const auto *IdentifierAtCursor =
syntax::spelledIdentifierTouching(*CurLoc, AST.getTokens());
if (!IdentifierAtCursor)
return Results;
if (auto M = locateMacroAt(*IdentifierAtCursor, AST.getPreprocessor())) {
SymbolDetails NewMacro;
NewMacro.name = std::string(M->Name);
llvm::SmallString<32> USR;
if (!index::generateUSRForMacro(NewMacro.name, M->Info->getDefinitionLoc(),
SM, USR)) {
NewMacro.USR = std::string(USR.str());
NewMacro.ID = SymbolID(NewMacro.USR);
}
Results.push_back(std::move(NewMacro));
}
return Results;
}
llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const LocatedSymbol &S) {
OS << S.Name << ": " << S.PreferredDeclaration;
if (S.Definition)
OS << " def=" << *S.Definition;
return OS;
}
// FIXME(nridge): Reduce duplication between this function and declToSym().
static llvm::Optional<TypeHierarchyItem>
declToTypeHierarchyItem(ASTContext &Ctx, const NamedDecl &ND) {
auto &SM = Ctx.getSourceManager();
SourceLocation NameLoc = nameLocation(ND, Ctx.getSourceManager());
SourceLocation BeginLoc = SM.getSpellingLoc(SM.getFileLoc(ND.getBeginLoc()));
SourceLocation EndLoc = SM.getSpellingLoc(SM.getFileLoc(ND.getEndLoc()));
const auto DeclRange =
toHalfOpenFileRange(SM, Ctx.getLangOpts(), {BeginLoc, EndLoc});
if (!DeclRange)
return llvm::None;
auto FilePath =
getCanonicalPath(SM.getFileEntryForID(SM.getFileID(NameLoc)), SM);
auto TUPath = getCanonicalPath(SM.getFileEntryForID(SM.getMainFileID()), SM);
if (!FilePath || !TUPath)
return llvm::None; // Not useful without a uri.
Position NameBegin = sourceLocToPosition(SM, NameLoc);
Position NameEnd = sourceLocToPosition(
SM, Lexer::getLocForEndOfToken(NameLoc, 0, SM, Ctx.getLangOpts()));
index::SymbolInfo SymInfo = index::getSymbolInfo(&ND);
// FIXME: this is not classifying constructors, destructors and operators
// correctly (they're all "methods").
SymbolKind SK = indexSymbolKindToSymbolKind(SymInfo.Kind);
TypeHierarchyItem THI;
THI.name = printName(Ctx, ND);
THI.kind = SK;
THI.deprecated = ND.isDeprecated();
THI.range = Range{sourceLocToPosition(SM, DeclRange->getBegin()),
sourceLocToPosition(SM, DeclRange->getEnd())};
THI.selectionRange = Range{NameBegin, NameEnd};
if (!THI.range.contains(THI.selectionRange)) {
// 'selectionRange' must be contained in 'range', so in cases where clang
// reports unrelated ranges we need to reconcile somehow.
THI.range = THI.selectionRange;
}
THI.uri = URIForFile::canonicalize(*FilePath, *TUPath);
// Compute the SymbolID and store it in the 'data' field.
// This allows typeHierarchy/resolve to be used to
// resolve children of items returned in a previous request
// for parents.
if (auto ID = getSymbolID(&ND)) {
THI.data = ID->str();
}
return THI;
}
static Optional<TypeHierarchyItem>
symbolToTypeHierarchyItem(const Symbol &S, const SymbolIndex *Index,
PathRef TUPath) {
auto Loc = symbolToLocation(S, TUPath);
if (!Loc) {
log("Type hierarchy: {0}", Loc.takeError());
return llvm::None;
}
TypeHierarchyItem THI;
THI.name = std::string(S.Name);
THI.kind = indexSymbolKindToSymbolKind(S.SymInfo.Kind);
THI.deprecated = (S.Flags & Symbol::Deprecated);
THI.selectionRange = Loc->range;
// FIXME: Populate 'range' correctly
// (https://github.com/clangd/clangd/issues/59).
THI.range = THI.selectionRange;
THI.uri = Loc->uri;
// Store the SymbolID in the 'data' field. The client will
// send this back in typeHierarchy/resolve, allowing us to
// continue resolving additional levels of the type hierarchy.
THI.data = S.ID.str();
return std::move(THI);
}
static void fillSubTypes(const SymbolID &ID,
std::vector<TypeHierarchyItem> &SubTypes,
const SymbolIndex *Index, int Levels, PathRef TUPath) {
RelationsRequest Req;
Req.Subjects.insert(ID);
Req.Predicate = RelationKind::BaseOf;
Index->relations(Req, [&](const SymbolID &Subject, const Symbol &Object) {
if (Optional<TypeHierarchyItem> ChildSym =
symbolToTypeHierarchyItem(Object, Index, TUPath)) {
if (Levels > 1) {
ChildSym->children.emplace();
fillSubTypes(Object.ID, *ChildSym->children, Index, Levels - 1, TUPath);
}
SubTypes.emplace_back(std::move(*ChildSym));
}
});
}
using RecursionProtectionSet = llvm::SmallSet<const CXXRecordDecl *, 4>;
static void fillSuperTypes(const CXXRecordDecl &CXXRD, ASTContext &ASTCtx,
std::vector<TypeHierarchyItem> &SuperTypes,
RecursionProtectionSet &RPSet) {
// typeParents() will replace dependent template specializations
// with their class template, so to avoid infinite recursion for
// certain types of hierarchies, keep the templates encountered
// along the parent chain in a set, and stop the recursion if one
// starts to repeat.
auto *Pattern = CXXRD.getDescribedTemplate() ? &CXXRD : nullptr;
if (Pattern) {
if (!RPSet.insert(Pattern).second) {
return;
}
}
for (const CXXRecordDecl *ParentDecl : typeParents(&CXXRD)) {
if (Optional<TypeHierarchyItem> ParentSym =
declToTypeHierarchyItem(ASTCtx, *ParentDecl)) {
ParentSym->parents.emplace();
fillSuperTypes(*ParentDecl, ASTCtx, *ParentSym->parents, RPSet);
SuperTypes.emplace_back(std::move(*ParentSym));
}
}
if (Pattern) {
RPSet.erase(Pattern);
}
}
const CXXRecordDecl *findRecordTypeAt(ParsedAST &AST, Position Pos) {
auto RecordFromNode =
[](const SelectionTree::Node *N) -> const CXXRecordDecl * {
if (!N)
return nullptr;
// Note: explicitReferenceTargets() will search for both template
// instantiations and template patterns, and prefer the former if available
// (generally, one will be available for non-dependent specializations of a
// class template).
auto Decls = explicitReferenceTargets(N->ASTNode, DeclRelation::Underlying);
if (Decls.empty())
return nullptr;
const NamedDecl *D = Decls[0];
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
// If this is a variable, use the type of the variable.
return VD->getType().getTypePtr()->getAsCXXRecordDecl();
}
if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
// If this is a method, use the type of the class.
return Method->getParent();
}
// We don't handle FieldDecl because it's not clear what behaviour
// the user would expect: the enclosing class type (as with a
// method), or the field's type (as with a variable).
return dyn_cast<CXXRecordDecl>(D);
};
const SourceManager &SM = AST.getSourceManager();
const CXXRecordDecl *Result = nullptr;
auto Offset = positionToOffset(SM.getBufferData(SM.getMainFileID()), Pos);
if (!Offset) {
llvm::consumeError(Offset.takeError());
return Result;
}
SelectionTree::createEach(AST.getASTContext(), AST.getTokens(), *Offset,
*Offset, [&](SelectionTree ST) {
Result = RecordFromNode(ST.commonAncestor());
return Result != nullptr;
});
return Result;
}
std::vector<const CXXRecordDecl *> typeParents(const CXXRecordDecl *CXXRD) {
std::vector<const CXXRecordDecl *> Result;
// If this is an invalid instantiation, instantiation of the bases
// may not have succeeded, so fall back to the template pattern.
if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(CXXRD)) {
if (CTSD->isInvalidDecl())
CXXRD = CTSD->getSpecializedTemplate()->getTemplatedDecl();
}
for (auto Base : CXXRD->bases()) {
const CXXRecordDecl *ParentDecl = nullptr;
const Type *Type = Base.getType().getTypePtr();
if (const RecordType *RT = Type->getAs<RecordType>()) {
ParentDecl = RT->getAsCXXRecordDecl();
}
if (!ParentDecl) {
// Handle a dependent base such as "Base<T>" by using the primary
// template.
if (const TemplateSpecializationType *TS =
Type->getAs<TemplateSpecializationType>()) {
TemplateName TN = TS->getTemplateName();
if (TemplateDecl *TD = TN.getAsTemplateDecl()) {
ParentDecl = dyn_cast<CXXRecordDecl>(TD->getTemplatedDecl());
}
}
}
if (ParentDecl)
Result.push_back(ParentDecl);
}
return Result;
}
llvm::Optional<TypeHierarchyItem>
getTypeHierarchy(ParsedAST &AST, Position Pos, int ResolveLevels,
TypeHierarchyDirection Direction, const SymbolIndex *Index,
PathRef TUPath) {
const CXXRecordDecl *CXXRD = findRecordTypeAt(AST, Pos);
if (!CXXRD)
return llvm::None;
bool WantParents = Direction == TypeHierarchyDirection::Parents ||
Direction == TypeHierarchyDirection::Both;
bool WantChildren = Direction == TypeHierarchyDirection::Children ||
Direction == TypeHierarchyDirection::Both;
// If we're looking for children, we're doing the lookup in the index.
// The index does not store relationships between implicit
// specializations, so if we have one, use the template pattern instead.
// Note that this needs to be done before the declToTypeHierarchyItem(),
// otherwise the type hierarchy item would misleadingly contain the
// specialization parameters, while the children would involve classes
// that derive from other specializations of the template.
if (WantChildren) {
if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(CXXRD))
CXXRD = CTSD->getTemplateInstantiationPattern();
}
Optional<TypeHierarchyItem> Result =
declToTypeHierarchyItem(AST.getASTContext(), *CXXRD);
if (!Result)
return Result;
if (WantParents) {
Result->parents.emplace();
RecursionProtectionSet RPSet;
fillSuperTypes(*CXXRD, AST.getASTContext(), *Result->parents, RPSet);
}
if (WantChildren && ResolveLevels > 0) {
Result->children.emplace();
if (Index) {
if (Optional<SymbolID> ID = getSymbolID(CXXRD))
fillSubTypes(*ID, *Result->children, Index, ResolveLevels, TUPath);
}
}
return Result;
}
void resolveTypeHierarchy(TypeHierarchyItem &Item, int ResolveLevels,
TypeHierarchyDirection Direction,
const SymbolIndex *Index) {
// We only support typeHierarchy/resolve for children, because for parents
// we ignore ResolveLevels and return all levels of parents eagerly.
if (Direction == TypeHierarchyDirection::Parents || ResolveLevels == 0)
return;
Item.children.emplace();
if (Index && Item.data) {
// We store the item's SymbolID in the 'data' field, and the client
// passes it back to us in typeHierarchy/resolve.
if (Expected<SymbolID> ID = SymbolID::fromStr(*Item.data)) {
fillSubTypes(*ID, *Item.children, Index, ResolveLevels, Item.uri.file());
}
}
}
llvm::DenseSet<const Decl *> getNonLocalDeclRefs(ParsedAST &AST,
const FunctionDecl *FD) {
if (!FD->hasBody())
return {};
llvm::DenseSet<const Decl *> DeclRefs;
findExplicitReferences(FD, [&](ReferenceLoc Ref) {
for (const Decl *D : Ref.Targets) {
if (!index::isFunctionLocalSymbol(D) && !D->isTemplateParameter() &&
!Ref.IsDecl)
DeclRefs.insert(D);
}
});
return DeclRefs;
}
} // namespace clangd
} // namespace clang
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