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Diffstat (limited to '')
| -rw-r--r-- | compilerplugins/clang/plugin.cxx | 867 |
1 files changed, 867 insertions, 0 deletions
diff --git a/compilerplugins/clang/plugin.cxx b/compilerplugins/clang/plugin.cxx new file mode 100644 index 000000000..5248927e5 --- /dev/null +++ b/compilerplugins/clang/plugin.cxx @@ -0,0 +1,867 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * Based on LLVM/Clang. + * + * This file is distributed under the University of Illinois Open Source + * License. See LICENSE.TXT for details. + * + */ + +#include "plugin.hxx" + +#include <cassert> +#include <cstddef> +#include <string> + +#include <clang/Basic/FileManager.h> +#include <clang/Lex/Lexer.h> + +#include "config_clang.h" + +#include "compat.hxx" +#include "pluginhandler.hxx" +#include "check.hxx" + +#if CLANG_VERSION >= 110000 +#include "clang/AST/ParentMapContext.h" +#endif + +/* +Base classes for plugin actions. +*/ +namespace loplugin +{ + +namespace { + +Expr const * skipImplicit(Expr const * expr) { + if (auto const e = dyn_cast<MaterializeTemporaryExpr>(expr)) { + expr = compat::getSubExpr(e)->IgnoreImpCasts(); + } + if (auto const e = dyn_cast<CXXBindTemporaryExpr>(expr)) { + expr = e->getSubExpr(); + } + return expr; +} + +bool structurallyIdentical(Stmt const * stmt1, Stmt const * stmt2) { + if (stmt1->getStmtClass() != stmt2->getStmtClass()) { + return false; + } + switch (stmt1->getStmtClass()) { + case Stmt::CXXConstructExprClass: + if (cast<CXXConstructExpr>(stmt1)->getConstructor()->getCanonicalDecl() + != cast<CXXConstructExpr>(stmt2)->getConstructor()->getCanonicalDecl()) + { + return false; + } + break; + case Stmt::DeclRefExprClass: + if (cast<DeclRefExpr>(stmt1)->getDecl()->getCanonicalDecl() + != cast<DeclRefExpr>(stmt2)->getDecl()->getCanonicalDecl()) + { + return false; + } + break; + case Stmt::ImplicitCastExprClass: + { + auto const e1 = cast<ImplicitCastExpr>(stmt1); + auto const e2 = cast<ImplicitCastExpr>(stmt2); + if (e1->getCastKind() != e2->getCastKind() + || e1->getType().getCanonicalType() != e2->getType().getCanonicalType()) + { + return false; + } + break; + } + case Stmt::MemberExprClass: + { + auto const e1 = cast<MemberExpr>(stmt1); + auto const e2 = cast<MemberExpr>(stmt2); + if (e1->isArrow() != e2->isArrow() + || e1->getType().getCanonicalType() != e2->getType().getCanonicalType()) + { + return false; + } + break; + } + case Stmt::CXXMemberCallExprClass: + case Stmt::CXXOperatorCallExprClass: + if (cast<Expr>(stmt1)->getType().getCanonicalType() + != cast<Expr>(stmt2)->getType().getCanonicalType()) + { + return false; + } + break; + case Stmt::MaterializeTemporaryExprClass: + case Stmt::CXXBindTemporaryExprClass: + case Stmt::ParenExprClass: + break; + case Stmt::CXXNullPtrLiteralExprClass: + return true; + default: + // Conservatively assume non-identical for expressions that don't happen for us in practice + // when compiling the LO code base (and for which the above set of supported classes would + // need to be extended): + return false; + } + auto i1 = stmt1->child_begin(); + auto e1 = stmt1->child_end(); + auto i2 = stmt2->child_begin(); + auto e2 = stmt2->child_end(); + for (; i1 != e1; ++i1, ++i2) { + if (i2 == e2 || !structurallyIdentical(*i1, *i2)) { + return false; + } + } + return i2 == e2; +} + +} + +Plugin::Plugin( const InstantiationData& data ) + : compiler( data.compiler ), handler( data.handler ), name( data.name ) +{ +} + +DiagnosticBuilder Plugin::report( DiagnosticsEngine::Level level, StringRef message, SourceLocation loc ) const +{ + return handler.report( level, name, message, compiler, loc ); +} + +void normalizeDotDotInFilePath( std::string & s ) +{ + for (std::string::size_type i = 0;;) + { + i = s.find("/.", i); + if (i == std::string::npos) { + break; + } + if (i + 2 == s.length() || s[i + 2] == '/') { + s.erase(i, 2); // [AAA]/.[/CCC] -> [AAA][/CCC] + } else if (s[i + 2] == '.' + && (i + 3 == s.length() || s[i + 3] == '/')) + { + if (i == 0) { // /..[/CCC] -> /..[/CCC] + break; + } + auto j = s.rfind('/', i - 1); + if (j == std::string::npos) + { + // BBB/..[/CCC] -> BBB/..[/CCC] (instead of BBB/../CCC -> + // CCC, to avoid wrong ../../CCC -> CCC; relative paths + // shouldn't happen anyway, and even if they did, wouldn't + // match against WORKDIR anyway, as WORKDIR should be + // absolute): + break; + } + s.erase(j, i + 3 - j); // AAA/BBB/..[/CCC] -> AAA[/CCC] + i = j; + } else { + i += 2; + } + } +} + +void Plugin::registerPlugin( Plugin* (*create)( const InstantiationData& ), const char* optionName, + bool isPPCallback, bool isSharedPlugin, bool byDefault ) +{ + PluginHandler::registerPlugin( create, optionName, isPPCallback, isSharedPlugin, byDefault ); +} + +bool Plugin::evaluate(const Expr* expr, APSInt& x) +{ + if (compat::EvaluateAsInt(expr, x, compiler.getASTContext())) + { + return true; + } + if (isa<CXXNullPtrLiteralExpr>(expr)) { + x = 0; + return true; + } + return false; +} + +compat::DynTypedNodeList Plugin::getParents(Decl const & decl) +{ +#if CLANG_VERSION >= 110000 + if (!parentMapContext_) { + parentMapContext_.reset(new ParentMapContext(compiler.getASTContext())); + parentMapContext_->setTraversalKind(TK_AsIs); + } + return parentMapContext_->getParents(decl); +#else + return compiler.getASTContext().getParents(decl); +#endif +} + +compat::DynTypedNodeList Plugin::getParents(Stmt const & stmt) +{ +#if CLANG_VERSION >= 110000 + if (!parentMapContext_) { + parentMapContext_.reset(new ParentMapContext(compiler.getASTContext())); + parentMapContext_->setTraversalKind(TK_AsIs); + } + return parentMapContext_->getParents(stmt); +#else + return compiler.getASTContext().getParents(stmt); +#endif +} + +const Stmt* Plugin::getParentStmt( const Stmt* stmt ) +{ + auto parentsRange = getParents(*stmt); + if ( parentsRange.begin() == parentsRange.end()) + return nullptr; + return parentsRange.begin()->get<Stmt>(); +} + +Stmt* Plugin::getParentStmt( Stmt* stmt ) +{ + auto parentsRange = getParents(*stmt); + if ( parentsRange.begin() == parentsRange.end()) + return nullptr; + return const_cast<Stmt*>(parentsRange.begin()->get<Stmt>()); +} + +const Decl* Plugin::getFunctionDeclContext(const Stmt* stmt) +{ + auto const parents = getParents(*stmt); + auto it = parents.begin(); + + if (it == parents.end()) + return nullptr; + + const Decl *decl = it->get<Decl>(); + if (decl) + { + if (isa<VarDecl>(decl)) + return dyn_cast<FunctionDecl>(decl->getDeclContext()); + return decl; + } + + stmt = it->get<Stmt>(); + if (stmt) + return getFunctionDeclContext(stmt); + + return nullptr; +} + +const FunctionDecl* Plugin::getParentFunctionDecl( const Stmt* stmt ) +{ + const Decl *decl = getFunctionDeclContext(stmt); + if (decl) + return static_cast<const FunctionDecl*>(decl->getNonClosureContext()); + + return nullptr; +} + +StringRef Plugin::getFilenameOfLocation(SourceLocation spellingLocation) const +{ + // prevent crashes when running the global-analysis plugins + if (!spellingLocation.isValid()) + return ""; + + static enum { NOINIT, STDIN, GOOD } s_Mode(NOINIT); + if (s_Mode == GOOD) + { + return compiler.getSourceManager().getFilename(spellingLocation); + } + else if (s_Mode == STDIN + || !compiler.getSourceManager().isInMainFile(spellingLocation)) + { + const char* bufferName = compiler.getSourceManager().getPresumedLoc(spellingLocation).getFilename(); + return bufferName; + } + else + { + auto const fn(compiler.getSourceManager().getFilename(spellingLocation)); + if (!fn.data()) // wtf? happens in sot/source/sdstor/stg.cxx + { + return fn; + } +#if !defined _WIN32 + assert(fn.startswith("/") || fn == "<stdin>"); +#endif + s_Mode = fn == "<stdin>" ? STDIN : GOOD; + return getFilenameOfLocation(spellingLocation); + } +} + +bool Plugin::isInUnoIncludeFile(SourceLocation spellingLocation) const +{ + StringRef name{ getFilenameOfLocation(spellingLocation) }; + return compiler.getSourceManager().isInMainFile(spellingLocation) + ? (isSamePathname(name, SRCDIR "/cppu/source/cppu/compat.cxx") + || isSamePathname(name, SRCDIR "/cppuhelper/source/compat.cxx") + || isSamePathname(name, SRCDIR "/sal/osl/all/compat.cxx")) + : (hasPathnamePrefix(name, SRCDIR "/include/com/") + || hasPathnamePrefix(name, SRCDIR "/include/cppu/") + || hasPathnamePrefix(name, SRCDIR "/include/cppuhelper/") + || hasPathnamePrefix(name, SRCDIR "/include/osl/") + || hasPathnamePrefix(name, SRCDIR "/include/rtl/") + || hasPathnamePrefix(name, SRCDIR "/include/sal/") + || hasPathnamePrefix(name, SRCDIR "/include/salhelper/") + || hasPathnamePrefix(name, SRCDIR "/include/systools/") + || hasPathnamePrefix(name, SRCDIR "/include/typelib/") + || hasPathnamePrefix(name, SRCDIR "/include/uno/")); +} + +bool Plugin::isInUnoIncludeFile(const FunctionDecl* functionDecl) const +{ + return isInUnoIncludeFile(compiler.getSourceManager().getSpellingLoc( + functionDecl->getCanonicalDecl()->getNameInfo().getLoc())); +} + +SourceLocation Plugin::locationAfterToken( SourceLocation location ) +{ + return Lexer::getLocForEndOfToken( location, 0, compiler.getSourceManager(), compiler.getLangOpts()); +} + +bool Plugin::isUnitTestMode() +{ + return PluginHandler::isUnitTestMode(); +} + +bool Plugin::containsPreprocessingConditionalInclusion(SourceRange range) +{ + // Preprocessing directives (other than _Pragma, which is not relevant here) cannot appear in + // macro expansions, so it is safe to just consider the range of expansion locations: + auto const begin = compiler.getSourceManager().getExpansionLoc( + range.getBegin()); + auto const end = compiler.getSourceManager().getExpansionLoc( + range.getEnd()); + assert(begin.isFileID() && end.isFileID()); + if (!(begin == end + || compiler.getSourceManager().isBeforeInTranslationUnit( + begin, end))) + { + if (isDebugMode()) { + report( + DiagnosticsEngine::Fatal, + ("unexpected broken range for Plugin::containsPreprocessingConditionalInclusion," + " case 1"), + range.getBegin()) + << range; + } + // Conservatively assume "yes" if lexing fails: + return true; + } + auto hash = false; + for (auto loc = begin;;) { + Token tok; + if (Lexer::getRawToken( + loc, tok, compiler.getSourceManager(), + compiler.getLangOpts(), true)) + { + if (isDebugMode()) { + report( + DiagnosticsEngine::Fatal, + ("unexpected broken range for" + " Plugin::containsPreprocessingConditionalInclusion, case 2"), + loc) + << range; + } + // Conservatively assume "yes" if lexing fails: + return true; + } + if (hash && tok.is(tok::raw_identifier)) { + auto const id = tok.getRawIdentifier(); + if (id == "if" || id == "ifdef" || id == "ifndef" + || id == "elif" || id == "else" || id == "endif") + { + return true; + } + } + if (loc == end) { + break; + } + hash = tok.is(tok::hash) && tok.isAtStartOfLine(); + loc = loc.getLocWithOffset( + std::max<unsigned>( + Lexer::MeasureTokenLength( + loc, compiler.getSourceManager(), + compiler.getLangOpts()), + 1)); + } + return false; +} + +Plugin::IdenticalDefaultArgumentsResult Plugin::checkIdenticalDefaultArguments( + Expr const * argument1, Expr const * argument2) +{ + if ((argument1 == nullptr) != (argument2 == nullptr)) { + return IdenticalDefaultArgumentsResult::No; + } + if (argument1 == nullptr) { + return IdenticalDefaultArgumentsResult::Yes; + } + if (argument1->isNullPointerConstant(compiler.getASTContext(), Expr::NPC_NeverValueDependent) + && argument2->isNullPointerConstant(compiler.getASTContext(), Expr::NPC_NeverValueDependent)) + { + return IdenticalDefaultArgumentsResult::Yes; + } + APSInt x1, x2; + if (evaluate(argument1, x1) && evaluate(argument2, x2)) + { + return x1 == x2 + ? IdenticalDefaultArgumentsResult::Yes + : IdenticalDefaultArgumentsResult::No; + } + APFloat f1(0.0f), f2(0.0f); + if (argument1->EvaluateAsFloat(f1, compiler.getASTContext()) + && argument2->EvaluateAsFloat(f2, compiler.getASTContext())) + { + return f1.bitwiseIsEqual(f2) + ? IdenticalDefaultArgumentsResult::Yes + : IdenticalDefaultArgumentsResult::No; + } + auto const desugared1 = argument1->IgnoreParenImpCasts(); + auto const desugared2 = argument2->IgnoreParenImpCasts(); + if (auto const lit1 = dyn_cast<clang::StringLiteral>(desugared1)) { + if (auto const lit2 = dyn_cast<clang::StringLiteral>(desugared2)) { + return lit1->getBytes() == lit2->getBytes() + ? IdenticalDefaultArgumentsResult::Yes + : IdenticalDefaultArgumentsResult::No; + } + } + // catch params with defaults like "= OUString()" + for (Expr const * e1 = desugared1, * e2 = desugared2;;) { + auto const ce1 = dyn_cast<CXXConstructExpr>(skipImplicit(e1)); + auto const ce2 = dyn_cast<CXXConstructExpr>(skipImplicit(e2)); + if (ce1 == nullptr || ce2 == nullptr) { + break; + } + if (ce1->getConstructor()->getCanonicalDecl() != ce2->getConstructor()->getCanonicalDecl()) + { + return IdenticalDefaultArgumentsResult::No; + } + if (ce1->isElidable() && ce2->isElidable() && ce1->getNumArgs() == 1 + && ce2->getNumArgs() == 1) + { + assert(ce1->getConstructor()->isCopyOrMoveConstructor()); + e1 = ce1->getArg(0)->IgnoreImpCasts(); + e2 = ce2->getArg(0)->IgnoreImpCasts(); + continue; + } + if (ce1->getNumArgs() == 0 && ce2->getNumArgs() == 0) { + return IdenticalDefaultArgumentsResult::Yes; + } + break; + } + // If the EvaluateAsRValue derivatives above failed because the arguments use e.g. (constexpr) + // function template specializations that happen to not have been instantiated in this TU, try a + // structural comparison of the arguments: + if (structurallyIdentical(argument1, argument2)) { + return IdenticalDefaultArgumentsResult::Yes; + } + if (isDebugMode()) { + report( + DiagnosticsEngine::Fatal, "TODO: Unexpected 'IdenticalDefaultArgumentsResult::Maybe'", + argument1->getExprLoc()) + << argument1->getSourceRange(); + report( + DiagnosticsEngine::Note, "TODO: second argument is here", argument2->getExprLoc()) + << argument2->getSourceRange(); + argument1->dump(); + argument2->dump(); + } + return IdenticalDefaultArgumentsResult::Maybe; +} + +RewritePlugin::RewritePlugin( const InstantiationData& data ) + : Plugin( data ) + , rewriter( data.rewriter ) +{ +} + +bool RewritePlugin::insertText( SourceLocation Loc, StringRef Str, bool InsertAfter, bool indentNewLines ) +{ + assert( rewriter ); + if (wouldRewriteWorkdir(Loc)) + return false; + SourceRange Range(SourceRange(Loc, Loc.getLocWithOffset(Str.size()))); + if( !handler.checkOverlap( Range ) ) + { + report( DiagnosticsEngine::Warning, "double code removal, possible plugin error", Range.getBegin()); + return false; + } + if( rewriter->InsertText( Loc, Str, InsertAfter, indentNewLines )) + return reportEditFailure( Loc ); + handler.addSourceModification(Range); + return true; +} + +bool RewritePlugin::insertTextAfter( SourceLocation Loc, StringRef Str ) +{ + assert( rewriter ); + if (wouldRewriteWorkdir(Loc)) + return false; + SourceRange Range(SourceRange(Loc, Loc.getLocWithOffset(Str.size()))); + if( !handler.checkOverlap( Range ) ) + { + report( DiagnosticsEngine::Warning, "double code removal, possible plugin error", Range.getBegin()); + return false; + } + if( rewriter->InsertTextAfter( Loc, Str )) + return reportEditFailure( Loc ); + handler.addSourceModification(Range); + return true; +} + +bool RewritePlugin::insertTextAfterToken( SourceLocation Loc, StringRef Str ) +{ + assert( rewriter ); + if (wouldRewriteWorkdir(Loc)) + return false; + SourceRange Range(SourceRange(Loc, Loc.getLocWithOffset(Str.size()))); + if( !handler.checkOverlap( Range ) ) + { + report( DiagnosticsEngine::Warning, "double code removal, possible plugin error", Range.getBegin()); + return false; + } + if( rewriter->InsertTextAfterToken( Loc, Str )) + return reportEditFailure( Loc ); + handler.addSourceModification(Range); + return true; +} + +bool RewritePlugin::insertTextBefore( SourceLocation Loc, StringRef Str ) +{ + assert( rewriter ); + if (wouldRewriteWorkdir(Loc)) + return false; + SourceRange Range(SourceRange(Loc, Loc.getLocWithOffset(Str.size()))); + if( !handler.checkOverlap( Range ) ) + { + report( DiagnosticsEngine::Warning, "double code removal, possible plugin error", Range.getBegin()); + return false; + } + if( rewriter->InsertTextBefore( Loc, Str )) + return reportEditFailure( Loc ); + handler.addSourceModification(Range); + return true; +} + +bool RewritePlugin::removeText( SourceLocation Start, unsigned Length, RewriteOptions opts ) +{ + CharSourceRange range( SourceRange( Start, Start.getLocWithOffset( Length )), false ); + return removeText( range, opts ); +} + +bool RewritePlugin::removeText( SourceRange range, RewriteOptions opts ) +{ + return removeText( CharSourceRange( range, true ), opts ); +} + +bool RewritePlugin::removeText( CharSourceRange range, RewriteOptions opts ) +{ + assert( rewriter ); + if (wouldRewriteWorkdir(range.getBegin())) + return false; + if( rewriter->getRangeSize( range, opts ) == -1 ) + return reportEditFailure( range.getBegin()); + if( !handler.checkOverlap( range.getAsRange() ) ) + { + report( DiagnosticsEngine::Warning, "double code removal, possible plugin error", range.getBegin()); + return false; + } + if( opts.flags & RemoveWholeStatement || opts.flags & RemoveAllWhitespace ) + { + if( !adjustRangeForOptions( &range, opts )) + return reportEditFailure( range.getBegin()); + } + if( rewriter->RemoveText( range, opts )) + return reportEditFailure( range.getBegin()); + handler.addSourceModification(range.getAsRange()); + return true; +} + +bool RewritePlugin::adjustRangeForOptions( CharSourceRange* range, RewriteOptions opts ) +{ + assert( rewriter ); + SourceManager& SM = rewriter->getSourceMgr(); + SourceLocation fileStartLoc = SM.getLocForStartOfFile( SM.getFileID( range->getBegin())); + if( fileStartLoc.isInvalid()) + return false; + bool isInvalid = false; + const char* fileBuf = SM.getCharacterData( fileStartLoc, &isInvalid ); + if( isInvalid ) + return false; + const char* startBuf = SM.getCharacterData( range->getBegin(), &isInvalid ); + if( isInvalid ) + return false; + SourceLocation locationEnd = range->getEnd(); + if( range->isTokenRange()) + locationEnd = locationAfterToken( locationEnd ); + const char* endBuf = SM.getCharacterData( locationEnd, &isInvalid ); + if( isInvalid ) + return false; + const char* startPos = startBuf; + --startPos; + while( startPos >= fileBuf && ( *startPos == ' ' || *startPos == '\t' )) + --startPos; + if( startPos >= fileBuf && *startPos == '\n' ) + startPos = startBuf - 1; // do not remove indentation whitespace (RemoveLineIfEmpty can do that) + const char* endPos = endBuf; + while( *endPos == ' ' || *endPos == '\t' ) + ++endPos; + if( opts.flags & RemoveWholeStatement ) + { + if( *endPos == ';' ) + ++endPos; + else + return false; + } + *range = CharSourceRange( SourceRange( range->getBegin().getLocWithOffset( startPos - startBuf + 1 ), + locationEnd.getLocWithOffset( endPos - endBuf )), false ); + return true; +} + +bool RewritePlugin::replaceText( SourceLocation Start, unsigned OrigLength, StringRef NewStr ) +{ + assert( rewriter ); + if (wouldRewriteWorkdir(Start)) + return false; + SourceRange Range(Start, Start.getLocWithOffset(std::max<size_t>(OrigLength, NewStr.size()))); + if( OrigLength != 0 && !handler.checkOverlap( Range ) ) + { + report( DiagnosticsEngine::Warning, "overlapping code replacement, possible plugin error", Start ); + return false; + } + if( rewriter->ReplaceText( Start, OrigLength, NewStr )) + return reportEditFailure( Start ); + handler.addSourceModification(Range); + return true; +} + +bool RewritePlugin::replaceText( SourceRange range, StringRef NewStr ) +{ + assert( rewriter ); + if (wouldRewriteWorkdir(range.getBegin())) + return false; + if( rewriter->getRangeSize( range ) == -1 ) + return reportEditFailure( range.getBegin()); + if( !handler.checkOverlap( range ) ) + { + report( DiagnosticsEngine::Warning, "overlapping code replacement, possible plugin error", range.getBegin()); + return false; + } + if( rewriter->ReplaceText( range, NewStr )) + return reportEditFailure( range.getBegin()); + handler.addSourceModification(range); + return true; +} + +bool RewritePlugin::replaceText( SourceRange range, SourceRange replacementRange ) +{ + assert( rewriter ); + if (wouldRewriteWorkdir(range.getBegin())) + return false; + if( rewriter->getRangeSize( range ) == -1 ) + return reportEditFailure( range.getBegin()); + if( !handler.checkOverlap( range ) ) + { + report( DiagnosticsEngine::Warning, "overlapping code replacement, possible plugin error", range.getBegin()); + return false; + } + if( rewriter->ReplaceText( range, replacementRange )) + return reportEditFailure( range.getBegin()); + handler.addSourceModification(range); + return true; +} + +bool RewritePlugin::wouldRewriteWorkdir(SourceLocation loc) +{ + if (loc.isInvalid() || loc.isMacroID()) { + return false; + } + return + getFilenameOfLocation(compiler.getSourceManager().getSpellingLoc(loc)) + .startswith(WORKDIR "/"); +} + +bool RewritePlugin::reportEditFailure( SourceLocation loc ) +{ + report( DiagnosticsEngine::Warning, "cannot perform source modification (macro expansion involved?)", loc ); + return false; +} + +namespace { + +template<typename Fn> bool checkPathname( + StringRef pathname, StringRef against, Fn check) +{ + if (check(pathname, against)) { + return true; + } +#if defined _WIN32 + for (std::size_t n = 0;;) + { + std::size_t n1 = pathname.find('\\', n); + std::size_t n2 = against.find('\\', n); + if (n1 <= n2) { + if (n1 >= against.size()) { + return check(pathname.substr(n), against.substr(n)); + } + if ((against[n1] != '/' && against[n1] != '\\') + || pathname.substr(n, n1 - n) != against.substr(n, n1 - n)) + { + break; + } + n = n1 + 1; + } else { + if (n2 >= pathname.size()) { + return check(pathname.substr(n), against.substr(n)); + } + if (pathname[n2] != '/' + || pathname.substr(n, n2 - n) != against.substr(n, n2 - n)) + { + break; + } + n = n2 + 1; + } + } +#endif + return false; +} + +} + +bool hasPathnamePrefix(StringRef pathname, StringRef prefix) +{ + return checkPathname( + pathname, prefix, + [](StringRef p, StringRef a) { return p.startswith(a); }); +} + +bool isSamePathname(StringRef pathname, StringRef other) +{ + return checkPathname( + pathname, other, [](StringRef p, StringRef a) { return p == a; }); +} + +bool hasCLanguageLinkageType(FunctionDecl const * decl) { + assert(decl != nullptr); + if (decl->isExternC()) { + return true; + } + if (decl->isInExternCContext()) { + return true; + } + return false; +} + +static const CXXRecordDecl* stripTypeSugar(QualType qt) +{ + const clang::Type* t = qt.getTypePtr(); + while (auto elaboratedType = dyn_cast<ElaboratedType>(t)) + t = elaboratedType->desugar().getTypePtr(); + auto recordType = dyn_cast<RecordType>(t); + if (!recordType) + return nullptr; + return dyn_cast_or_null<CXXRecordDecl>(recordType->getDecl()); +} + +int derivedFromCount(const CXXRecordDecl* subclassRecordDecl, const CXXRecordDecl* baseclassRecordDecl) +{ + if (!subclassRecordDecl || !baseclassRecordDecl) + return 0; + int derivedCount = 0; + if (subclassRecordDecl == baseclassRecordDecl) + derivedCount++; + if (!subclassRecordDecl->hasDefinition()) + return derivedCount; + for (auto it = subclassRecordDecl->bases_begin(); it != subclassRecordDecl->bases_end(); ++it) + { + derivedCount += derivedFromCount(stripTypeSugar(it->getType()), baseclassRecordDecl); + // short-circuit, we only care about 0,1,2 + if (derivedCount > 1) + return derivedCount; + } + for (auto it = subclassRecordDecl->vbases_begin(); it != subclassRecordDecl->vbases_end(); ++it) + { + derivedCount += derivedFromCount(stripTypeSugar(it->getType()), baseclassRecordDecl); + // short-circuit, we only care about 0,1,2 + if (derivedCount > 1) + return derivedCount; + } + return derivedCount; +} + +int derivedFromCount(QualType subclassQt, QualType baseclassQt) +{ + auto baseclassRecordDecl = stripTypeSugar(baseclassQt); + if (!baseclassRecordDecl) + return 0; + auto subclassRecordDecl = stripTypeSugar(subclassQt); + if (!subclassRecordDecl) + return 0; + + return derivedFromCount(subclassRecordDecl, baseclassRecordDecl); +} + +// It looks like Clang wrongly implements DR 4 +// (<http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#4>) and treats +// a variable declared in an 'extern "..." {...}'-style linkage-specification as +// if it contained the 'extern' specifier: +bool hasExternalLinkage(VarDecl const * decl) { + if (decl->getLinkageAndVisibility().getLinkage() != ExternalLinkage) { + return false; + } + for (auto ctx = decl->getLexicalDeclContext(); + ctx->getDeclKind() != Decl::TranslationUnit; + ctx = ctx->getLexicalParent()) + { + if (auto ls = dyn_cast<LinkageSpecDecl>(ctx)) { + if (!ls->hasBraces()) { + return true; + } + if (auto prev = decl->getPreviousDecl()) { + return hasExternalLinkage(prev); + } + return !decl->isInAnonymousNamespace(); + } + } + return true; +} + +bool isSmartPointerType(const Expr* e) +{ + // First check the object type as written, in case the get member function is + // declared at a base class of std::unique_ptr or std::shared_ptr: + auto const t = e->IgnoreImpCasts()->getType(); + auto const tc1 = loplugin::TypeCheck(t); + if (tc1.ClassOrStruct("unique_ptr").StdNamespace() + || tc1.ClassOrStruct("shared_ptr").StdNamespace()) + return true; + + // Then check the object type coerced to the type of the get member function, in + // case the type-as-written is derived from one of these types (tools::SvRef is + // final, but the rest are not; but note that this will fail when the type-as- + // written is derived from std::unique_ptr or std::shared_ptr for which the get + // member function is declared at a base class): + auto const tc2 = loplugin::TypeCheck(e->getType()); + if (tc2.ClassOrStruct("unique_ptr").StdNamespace() + || tc2.ClassOrStruct("shared_ptr").StdNamespace() + || tc2.Class("Reference").Namespace("uno").Namespace("star") + .Namespace("sun").Namespace("com").GlobalNamespace() + || tc2.Class("Reference").Namespace("rtl").GlobalNamespace() + || tc2.Class("SvRef").Namespace("tools").GlobalNamespace() + || tc2.Class("WeakReference").Namespace("tools").GlobalNamespace() + || tc2.Class("ScopedReadAccess").Namespace("Bitmap").GlobalNamespace() + || tc2.Class("ScopedVclPtrInstance").GlobalNamespace() + || tc2.Class("VclPtr").GlobalNamespace() + || tc2.Class("ScopedVclPtr").GlobalNamespace()) + { + return true; + } + return false; +} + + +} // namespace + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |