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Diffstat (limited to '')
| -rw-r--r-- | compilerplugins/clang/moveparam.cxx | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/compilerplugins/clang/moveparam.cxx b/compilerplugins/clang/moveparam.cxx new file mode 100644 index 0000000000..dc7a84b4d6 --- /dev/null +++ b/compilerplugins/clang/moveparam.cxx @@ -0,0 +1,191 @@ +/* -*- 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 <cassert> +#include <string> +#include <iostream> +#include <fstream> +#include <set> +#include <unordered_set> +#include "config_clang.h" +#include "plugin.hxx" +#include "check.hxx" + +/* +Look for places where we can pass by move && param and so avoid +unnecessary copies. +Empirically, when we are passing a container type to a function, 80% of the time, +we are passing a local temporary that can be moved instead of being copied. + +TODO this could be a lot smarter, with ignoring false+ e.g. when copying a param +in a loop +*/ + +namespace +{ +class MoveParam : public loplugin::FilteringPlugin<MoveParam> +{ +public: + explicit MoveParam(loplugin::InstantiationData const& data) + : FilteringPlugin(data) + { + } + + virtual bool preRun() override + { + std::string fn(handler.getMainFileName()); + loplugin::normalizeDotDotInFilePath(fn); + if (loplugin::hasPathnamePrefix(fn, SRCDIR "/filter/source/msfilter/escherex.cxx")) + return false; + if (loplugin::hasPathnamePrefix(fn, SRCDIR "/sc/source/ui/docshell/docfunc.cxx")) + return false; + if (loplugin::hasPathnamePrefix(fn, SRCDIR "/sc/source/ui/view/viewfunc.cxx")) + return false; + if (loplugin::hasPathnamePrefix(fn, SRCDIR "/basegfx/source/polygon/b2dpolygontools.cxx")) + return false; + if (loplugin::hasPathnamePrefix(fn, SRCDIR "/basegfx/source/polygon/b3dpolygontools.cxx")) + return false; + if (loplugin::hasPathnamePrefix(fn, SRCDIR "/connectivity/source/commontools/dbtools.cxx")) + return false; + return true; + } + + virtual void run() override + { + if (preRun()) + TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); + } + + bool VisitCXXOperatorCallExpr(const CXXOperatorCallExpr*); + bool VisitCXXConstructExpr(const CXXConstructExpr*); + + bool isContainerType(QualType qt); +}; + +bool MoveParam::VisitCXXOperatorCallExpr(const CXXOperatorCallExpr* callExpr) +{ + if (ignoreLocation(callExpr)) + return true; + if (!callExpr->isAssignmentOp()) + return true; + auto qt = callExpr->getType(); + if (!isContainerType(qt)) + return true; + auto declRef = dyn_cast<DeclRefExpr>(callExpr->getArg(1)->IgnoreParenImpCasts()); + if (!declRef) + return true; + + auto parmVarDecl = dyn_cast_or_null<ParmVarDecl>(declRef->getDecl()); + if (!parmVarDecl) + return true; + + if (!loplugin::TypeCheck(parmVarDecl->getType()).LvalueReference().Const()) + return true; + + StringRef aFileName = getFilenameOfLocation( + compiler.getSourceManager().getSpellingLoc(parmVarDecl->getBeginLoc())); + if (loplugin::hasPathnamePrefix(aFileName, + SRCDIR "/svx/source/sidebar/line/LineWidthValueSet.cxx")) + return true; + + report(DiagnosticsEngine::Warning, "rather use move && param1", callExpr->getBeginLoc()); + + return true; +} + +bool MoveParam::VisitCXXConstructExpr(const CXXConstructExpr* constructExpr) +{ + if (ignoreLocation(constructExpr->getBeginLoc())) + return true; + if (isInUnoIncludeFile(constructExpr->getBeginLoc())) + return true; + + auto qt = constructExpr->getType(); + if (!isContainerType(qt)) + return true; + + if (constructExpr->getNumArgs() != 1) + return true; + + auto declRef = dyn_cast<DeclRefExpr>(constructExpr->getArg(0)->IgnoreParenImpCasts()); + if (!declRef) + return true; + + auto parmVarDecl = dyn_cast_or_null<ParmVarDecl>(declRef->getDecl()); + if (!parmVarDecl) + return true; + + if (!loplugin::TypeCheck(parmVarDecl->getType()).LvalueReference().Const()) + return true; + + StringRef aFileName = getFilenameOfLocation( + compiler.getSourceManager().getSpellingLoc(parmVarDecl->getBeginLoc())); + if (loplugin::hasPathnamePrefix(aFileName, SRCDIR + "/include/drawinglayer/primitive2d/Primitive2DContainer.hxx")) + return true; + if (loplugin::hasPathnamePrefix(aFileName, + SRCDIR "/include/drawinglayer/primitive3d/baseprimitive3d.hxx")) + return true; + if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/svx/source/svdraw/svdmrkv.cxx")) + return true; + if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/include/editeng/swafopt.hxx")) + return true; + if (loplugin::hasPathnamePrefix( + aFileName, SRCDIR "/drawinglayer/source/primitive2d/textdecoratedprimitive2d.cxx")) + return true; + if (loplugin::hasPathnamePrefix(aFileName, + SRCDIR "/chart2/source/tools/InternalDataProvider.cxx")) + return true; + if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/sc/source/core/data/attrib.cxx")) + return true; + if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/sw/source/core/doc/docfmt.cxx")) + return true; + if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/configmgr/source/modifications.cxx")) + return true; + if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/svx/source/dialog/srchdlg.cxx")) + return true; + if (loplugin::hasPathnamePrefix(aFileName, + SRCDIR "/stoc/source/servicemanager/servicemanager.cxx")) + return true; + + report(DiagnosticsEngine::Warning, "rather use move && param3", constructExpr->getBeginLoc()); + + return true; +} + +bool MoveParam::isContainerType(QualType qt) +{ + auto tc = loplugin::TypeCheck(qt); + return tc.Class("Primitive2DContainer") + .Namespace("primitive2d") + .Namespace("drawinglayer") + .GlobalNamespace() + || tc.ClassOrStruct("sorted_vector").Namespace("o3tl").GlobalNamespace() + || tc.ClassOrStruct("array").StdNamespace() || tc.ClassOrStruct("vector").StdNamespace() + || tc.ClassOrStruct("deque").StdNamespace() + || tc.ClassOrStruct("forward_list").StdNamespace() + || tc.ClassOrStruct("list").StdNamespace() || tc.ClassOrStruct("set").StdNamespace() + || tc.ClassOrStruct("map").StdNamespace() || tc.ClassOrStruct("multiset").StdNamespace() + || tc.ClassOrStruct("multimap").StdNamespace() + || tc.ClassOrStruct("unordered_set").StdNamespace() + || tc.ClassOrStruct("unordered_map").StdNamespace() + || tc.ClassOrStruct("unordered_multiset").StdNamespace() + || tc.ClassOrStruct("unordered_multimap").StdNamespace() + || tc.ClassOrStruct("stack").StdNamespace() || tc.ClassOrStruct("queue").StdNamespace() + || tc.ClassOrStruct("priority_queue").StdNamespace(); +} + +/** off by default because it needs some hand-holding */ +loplugin::Plugin::Registration<MoveParam> moveparam("moveparam", false); + +} // namespace + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |