0792b85914
> AtomicExpr 0xcb01120 'std::__detail::__platform_wait_t':'int' > |-ImplicitCastExpr 0xcb01108 'std::__detail::__platform_wait_t *' <LValueToRValue> > | `-MemberExpr 0xcb01048 'std::__detail::__platform_wait_t *' lvalue ->_M_addr 0xcafd9c8 > | `-CXXThisExpr 0xcb01038 '__waiter_base<_Tp> *' implicit this > |-IntegerLiteral 0xcb01098 'int' 5 > `-IntegerLiteral 0xcb01078 'int' 1 > AtomicExpr 0xd1e2d08 'std::__detail::__platform_wait_t':'int' > |-ImplicitCastExpr 0xd1e2cf0 'std::__detail::__platform_wait_t *' <LValueToRValue> > | `-MemberExpr 0xd1e2cc0 'std::__detail::__platform_wait_t *' lvalue ->_M_addr 0xcb02bf8 > | `-CXXThisExpr 0xd1e2cb0 'struct std::__detail::__waiter_base<struct std::__detail::__waiter_pool> *' implicit this > |-IntegerLiteral 0xcb01098 'int' 5 > `-IntegerLiteral 0xcb01078 'int' 1 > error: 'error' diagnostics seen but not expected: > File ~/gcc/trunk/inst/lib/gcc/x86_64-pc-linux-gnu/12.0.1/../../../../include/c++/12.0.1/bits/atomic_wait.h Line 312: oh dear, what can the matter be? [loplugin:singlevalfields] > File ~/gcc/trunk/inst/lib/gcc/x86_64-pc-linux-gnu/12.0.1/../../../../include/c++/12.0.1/bits/atomic_wait.h Line 312: oh dear, what can the matter be? [loplugin:singlevalfields] Change-Id: I71c43b482aaa0992b7ce131d27e262b8e3b4087f Reviewed-on: https://gerrit.libreoffice.org/c/core/+/132160 Tested-by: Jenkins Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
577 lines
21 KiB
C++
577 lines
21 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <cassert>
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#include <string>
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#include <iostream>
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#include <fstream>
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#include <set>
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#include "config_clang.h"
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#include "compat.hxx"
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#include "plugin.hxx"
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#include "clang/AST/ParentMapContext.h"
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/**
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Look for fields that are only ever assigned a single constant value.
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We dmp a list of values assigned to fields, and a list of field definitions.
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Then we will post-process the 2 lists and find the set of interesting fields.
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Be warned that it produces around 5G of log file.
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The process goes something like this:
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$ make check
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$ make FORCE_COMPILE=all COMPILER_PLUGIN_TOOL='singlevalfields' check
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$ ./compilerplugins/clang/singlevalfields.py
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Note that the actual process may involve a fair amount of undoing, hand editing, and general messing around
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to get it to work :-)
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@TODO we don't spot fields that have been zero-initialised via calloc or rtl_allocateZeroMemory or memset
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@TODO calls to lambdas where a reference to the field is taken
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*/
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namespace {
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struct MyFieldInfo
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{
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FieldDecl const * fieldDecl;
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std::string parentClass;
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std::string fieldName;
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std::string fieldType;
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std::string sourceLocation;
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};
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bool operator < (const MyFieldInfo &lhs, const MyFieldInfo &rhs)
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{
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return std::tie(lhs.parentClass, lhs.fieldName)
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< std::tie(rhs.parentClass, rhs.fieldName);
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}
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struct MyFieldAssignmentInfo : public MyFieldInfo
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{
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std::string value;
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};
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bool operator < (const MyFieldAssignmentInfo &lhs, const MyFieldAssignmentInfo &rhs)
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{
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return std::tie(lhs.parentClass, lhs.fieldName, lhs.value)
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< std::tie(rhs.parentClass, rhs.fieldName, rhs.value);
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}
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// try to limit the voluminous output a little
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static std::set<MyFieldAssignmentInfo> assignedSet;
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static std::set<MyFieldInfo> definitionSet;
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/** escape the value string to make it easier to parse the output file in python */
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std::string escape(std::string s)
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{
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std::string out;
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for (size_t i=0; i<s.length(); ++i)
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if (int(s[i]) >= 32)
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out += s[i];
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else
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out += "\\" + std::to_string((int)s[i]);
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return out;
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}
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class SingleValFields:
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public RecursiveASTVisitor<SingleValFields>, public loplugin::Plugin
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{
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public:
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explicit SingleValFields(loplugin::InstantiationData const & data):
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Plugin(data) {}
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virtual void run() override
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{
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TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
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if (!isUnitTestMode())
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{
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// dump all our output in one write call - this is to try and limit IO "crosstalk" between multiple processes
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// writing to the same logfile
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std::string output;
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for (const MyFieldAssignmentInfo & s : assignedSet)
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output += "asgn:\t" + s.parentClass + "\t" + s.fieldName + "\t" + escape(s.value) + "\n";
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for (const MyFieldInfo & s : definitionSet)
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output += "defn:\t" + s.parentClass + "\t" + s.fieldName + "\t" + s.fieldType + "\t" + s.sourceLocation + "\n";
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std::ofstream myfile;
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myfile.open( WORKDIR "/loplugin.singlevalfields.log", std::ios::app | std::ios::out);
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myfile << output;
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myfile.close();
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}
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else
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{
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for (const MyFieldAssignmentInfo & s : assignedSet)
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if (s.fieldDecl && compiler.getSourceManager().isInMainFile(s.fieldDecl->getBeginLoc()))
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report(
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DiagnosticsEngine::Warning,
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"assign %0",
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s.fieldDecl->getBeginLoc())
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<< s.value;
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}
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}
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bool shouldVisitTemplateInstantiations () const { return true; }
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// to catch compiler-generated constructors
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bool shouldVisitImplicitCode() const { return true; }
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bool VisitFieldDecl( const FieldDecl* );
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bool VisitVarDecl( const VarDecl* );
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bool VisitMemberExpr( const MemberExpr* );
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bool VisitDeclRefExpr( const DeclRefExpr* );
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bool VisitCXXConstructorDecl( const CXXConstructorDecl* );
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// bool VisitUnaryExprOrTypeTraitExpr( const UnaryExprOrTypeTraitExpr* );
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private:
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void niceName(const DeclaratorDecl*, MyFieldInfo&);
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void walkPotentialAssign( const DeclaratorDecl* fieldOrVarDecl, const Stmt* stmt );
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std::string getExprValue(const Expr*);
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const FunctionDecl* get_top_FunctionDecl_from_Stmt(const Stmt&);
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void checkCallExpr(const Stmt* child, const CallExpr* callExpr, std::string& assignValue, bool& bPotentiallyAssignedTo);
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};
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void SingleValFields::niceName(const DeclaratorDecl* fieldOrVarDecl, MyFieldInfo& aInfo)
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{
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const VarDecl* varDecl = dyn_cast<VarDecl>(fieldOrVarDecl);
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const FieldDecl* fieldDecl = dyn_cast<FieldDecl>(fieldOrVarDecl);
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aInfo.fieldDecl = fieldDecl;
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if (fieldDecl)
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aInfo.parentClass = fieldDecl->getParent()->getQualifiedNameAsString();
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else
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{
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if (auto parentRecordDecl = dyn_cast<CXXRecordDecl>(varDecl->getDeclContext()))
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aInfo.parentClass = parentRecordDecl->getQualifiedNameAsString();
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else if (auto parentMethodDecl = dyn_cast<CXXMethodDecl>(varDecl->getDeclContext()))
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aInfo.parentClass = parentMethodDecl->getQualifiedNameAsString();
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else if (auto parentFunctionDecl = dyn_cast<FunctionDecl>(varDecl->getDeclContext()))
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aInfo.parentClass = parentFunctionDecl->getQualifiedNameAsString();
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else if (isa<TranslationUnitDecl>(varDecl->getDeclContext()))
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aInfo.parentClass = handler.getMainFileName().str();
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else if (auto parentNamespaceDecl = dyn_cast<NamespaceDecl>(varDecl->getDeclContext()))
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aInfo.parentClass = parentNamespaceDecl->getQualifiedNameAsString();
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else if (isa<LinkageSpecDecl>(varDecl->getDeclContext()))
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aInfo.parentClass = "extern"; // what to do here?
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else
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{
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std::cout << "what is this? " << varDecl->getDeclContext()->getDeclKindName() << std::endl;
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exit(1);
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}
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}
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aInfo.fieldName = fieldOrVarDecl->getNameAsString();
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aInfo.fieldType = fieldOrVarDecl->getType().getAsString();
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SourceLocation expansionLoc = compiler.getSourceManager().getExpansionLoc( fieldOrVarDecl->getLocation() );
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StringRef name = getFilenameOfLocation(expansionLoc);
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aInfo.sourceLocation = std::string(name.substr(strlen(SRCDIR)+1)) + ":" + std::to_string(compiler.getSourceManager().getSpellingLineNumber(expansionLoc));
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loplugin::normalizeDotDotInFilePath(aInfo.sourceLocation);
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}
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bool SingleValFields::VisitFieldDecl( const FieldDecl* fieldDecl )
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{
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auto canonicalDecl = fieldDecl->getCanonicalDecl();
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if( isInUnoIncludeFile( compiler.getSourceManager().getSpellingLoc(canonicalDecl->getLocation())) )
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return true;
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MyFieldInfo aInfo;
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niceName(canonicalDecl, aInfo);
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definitionSet.insert(aInfo);
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if (fieldDecl->getInClassInitializer())
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{
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MyFieldAssignmentInfo aInfo;
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niceName(canonicalDecl, aInfo);
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aInfo.value = getExprValue(fieldDecl->getInClassInitializer());
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assignedSet.insert(aInfo);
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}
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return true;
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}
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bool SingleValFields::VisitVarDecl( const VarDecl* varDecl )
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{
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if (isa<ParmVarDecl>(varDecl))
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return true;
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if (varDecl->getType().isConstQualified())
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return true;
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if (!(varDecl->isStaticLocal() || varDecl->isStaticDataMember() || varDecl->hasGlobalStorage()))
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return true;
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auto canonicalDecl = varDecl->getCanonicalDecl();
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if (!canonicalDecl->getLocation().isValid())
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return true;
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if( isInUnoIncludeFile( compiler.getSourceManager().getSpellingLoc(canonicalDecl->getLocation())) )
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return true;
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MyFieldInfo aInfo;
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niceName(canonicalDecl, aInfo);
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definitionSet.insert(aInfo);
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if (varDecl->getInit())
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{
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MyFieldAssignmentInfo aInfo;
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niceName(canonicalDecl, aInfo);
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aInfo.value = getExprValue(varDecl->getInit());
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assignedSet.insert(aInfo);
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}
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return true;
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}
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bool SingleValFields::VisitCXXConstructorDecl( const CXXConstructorDecl* decl )
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{
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// doesn't count as a write to fields because it's self->self
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if (decl->isCopyOrMoveConstructor())
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return true;
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for(auto it = decl->init_begin(); it != decl->init_end(); ++it)
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{
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const CXXCtorInitializer* init = *it;
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const FieldDecl* fieldDecl = init->getMember();
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if( !fieldDecl )
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continue;
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MyFieldAssignmentInfo aInfo;
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niceName(fieldDecl, aInfo);
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const Expr * expr = init->getInit();
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// unwrap any single-arg constructors, this helps to find smart pointers
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// that are only assigned nullptr
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if (auto cxxConstructExpr = dyn_cast<CXXConstructExpr>(expr))
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if (cxxConstructExpr->getNumArgs() == 1)
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expr = cxxConstructExpr->getArg(0);
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aInfo.value = getExprValue(expr);
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assignedSet.insert(aInfo);
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}
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return true;
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}
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bool SingleValFields::VisitMemberExpr( const MemberExpr* memberExpr )
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{
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const ValueDecl* decl = memberExpr->getMemberDecl();
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const FieldDecl* fieldDecl = dyn_cast<FieldDecl>(decl);
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if (!fieldDecl)
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return true;
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walkPotentialAssign(fieldDecl, memberExpr);
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return true;
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}
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bool SingleValFields::VisitDeclRefExpr( const DeclRefExpr* declRefExpr )
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{
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const VarDecl* varDecl = dyn_cast_or_null<VarDecl>(declRefExpr->getDecl());
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if (!varDecl)
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return true;
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if (isa<ParmVarDecl>(varDecl))
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return true;
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if (varDecl->getType().isConstQualified())
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return true;
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if (!(varDecl->isStaticLocal() || varDecl->isStaticDataMember() || varDecl->hasGlobalStorage()))
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return true;
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walkPotentialAssign(varDecl, declRefExpr);
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return true;
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}
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void SingleValFields::walkPotentialAssign( const DeclaratorDecl* fieldOrVarDecl, const Stmt* memberExpr )
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{
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const FunctionDecl* parentFunction = getParentFunctionDecl(memberExpr);
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if (parentFunction)
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{
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auto methodDecl = dyn_cast<CXXMethodDecl>(parentFunction);
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if (methodDecl && (methodDecl->isCopyAssignmentOperator() || methodDecl->isMoveAssignmentOperator()))
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return;
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if (methodDecl && methodDecl->getIdentifier()
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&& (methodDecl->getName().startswith("Clone") || methodDecl->getName().startswith("clone")))
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return;
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auto cxxConstructorDecl = dyn_cast<CXXConstructorDecl>(parentFunction);
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if (cxxConstructorDecl && cxxConstructorDecl->isCopyOrMoveConstructor())
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return;
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}
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// walk up the tree until we find something interesting
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const Stmt* child = memberExpr;
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const Stmt* parent = getParentStmt(memberExpr);
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bool bPotentiallyAssignedTo = false;
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bool bDump = false;
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std::string assignValue = "?";
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// check for field being returned by non-const ref eg. Foo& getFoo() { return f; }
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if (parentFunction && parent && isa<ReturnStmt>(parent)) {
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const Stmt* parent2 = getParentStmt(parent);
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if (parent2 && isa<CompoundStmt>(parent2)) {
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QualType qt = parentFunction->getReturnType().getDesugaredType(compiler.getASTContext());
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if (!qt.isConstQualified() && qt->isReferenceType()) {
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bPotentiallyAssignedTo = true;
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}
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}
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}
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while (!bPotentiallyAssignedTo) {
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// check for field being accessed by a reference variable e.g. Foo& f = m.foo;
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auto parentsList = compiler.getASTContext().getParents(*child);
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auto it = parentsList.begin();
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if (it != parentsList.end()) {
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const VarDecl *varDecl = it->get<VarDecl>();
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if (varDecl) {
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QualType qt = varDecl->getType().getDesugaredType(compiler.getASTContext());
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if (!qt.isConstQualified() && qt->isReferenceType()) {
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bPotentiallyAssignedTo = true;
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break;
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}
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}
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}
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if (!parent) {
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return;
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}
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if (isa<CastExpr>(parent) || isa<MemberExpr>(parent) || isa<ParenExpr>(parent) || isa<ParenListExpr>(parent)
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|| isa<ExprWithCleanups>(parent))
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{
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child = parent;
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parent = getParentStmt(parent);
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}
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else if (isa<UnaryOperator>(parent))
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{
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const UnaryOperator* unaryOperator = dyn_cast<UnaryOperator>(parent);
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int x = unaryOperator->getOpcode();
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if (x == UO_AddrOf || x == UO_PostInc || x == UO_PostDec || x == UO_PreInc || x == UO_PreDec) {
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assignValue = "?";
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bPotentiallyAssignedTo = true;
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break;
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}
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// cannot be assigned to anymore
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break;
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}
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else if (auto callExpr = dyn_cast<CallExpr>(parent))
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{
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checkCallExpr(child, callExpr, assignValue, bPotentiallyAssignedTo);
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break;
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}
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else if (isa<CXXConstructExpr>(parent))
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{
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const CXXConstructExpr* consExpr = dyn_cast<CXXConstructExpr>(parent);
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const CXXConstructorDecl* consDecl = consExpr->getConstructor();
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for (unsigned i = 0; i < consExpr->getNumArgs(); ++i) {
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if (i >= consDecl->getNumParams()) // can happen in template code
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break;
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if (consExpr->getArg(i) == child) {
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const ParmVarDecl* parmVarDecl = consDecl->getParamDecl(i);
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QualType qt = parmVarDecl->getType().getDesugaredType(compiler.getASTContext());
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if (!qt.isConstQualified() && qt->isReferenceType()) {
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bPotentiallyAssignedTo = true;
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}
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break;
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}
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}
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break;
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}
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else if (isa<BinaryOperator>(parent))
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{
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const BinaryOperator* binaryOp = dyn_cast<BinaryOperator>(parent);
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auto op = binaryOp->getOpcode();
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if ( binaryOp->getLHS() != child ) {
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// if the expr is on the RHS, do nothing
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}
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else if ( op == BO_Assign ) {
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assignValue = getExprValue(binaryOp->getRHS());
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bPotentiallyAssignedTo = true;
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} else if ( op == BO_MulAssign || op == BO_DivAssign
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|| op == BO_RemAssign || op == BO_AddAssign
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|| op == BO_SubAssign || op == BO_ShlAssign
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|| op == BO_ShrAssign || op == BO_AndAssign
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|| op == BO_XorAssign || op == BO_OrAssign )
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{
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bPotentiallyAssignedTo = true;
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}
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break;
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}
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else if ( isa<CompoundStmt>(parent)
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|| isa<SwitchStmt>(parent) || isa<CaseStmt>(parent) || isa<DefaultStmt>(parent)
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|| isa<DoStmt>(parent) || isa<WhileStmt>(parent)
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|| isa<IfStmt>(parent)
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|| isa<ForStmt>(parent)
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|| isa<ReturnStmt>(parent)
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|| isa<CXXNewExpr>(parent)
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|| isa<CXXDeleteExpr>(parent)
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|| isa<ConditionalOperator>(parent)
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|| isa<CXXTypeidExpr>(parent)
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|| isa<ArraySubscriptExpr>(parent)
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|| isa<CXXDependentScopeMemberExpr>(parent)
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|| isa<DeclStmt>(parent)
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|| isa<UnaryExprOrTypeTraitExpr>(parent)
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|| isa<UnresolvedMemberExpr>(parent)
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|| isa<MaterializeTemporaryExpr>(parent) //???
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|| isa<InitListExpr>(parent)
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|| isa<CXXUnresolvedConstructExpr>(parent)
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|| isa<LambdaExpr>(parent)
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|| isa<PackExpansionExpr>(parent)
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|| isa<CXXPseudoDestructorExpr>(parent)
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)
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{
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break;
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}
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else if ( isa<ArrayInitLoopExpr>(parent) || isa<AtomicExpr>(parent) || isa<GCCAsmStmt>(parent) || isa<VAArgExpr>(parent))
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{
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bPotentiallyAssignedTo = true;
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break;
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}
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else {
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bPotentiallyAssignedTo = true;
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bDump = true;
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break;
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}
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}
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if (bDump)
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{
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report(
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DiagnosticsEngine::Warning,
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"oh dear, what can the matter be?",
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memberExpr->getBeginLoc())
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<< memberExpr->getSourceRange();
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parent->dump();
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}
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if (bPotentiallyAssignedTo)
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{
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MyFieldAssignmentInfo aInfo;
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niceName(fieldOrVarDecl, aInfo);
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aInfo.value = assignValue;
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assignedSet.insert(aInfo);
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}
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}
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void SingleValFields::checkCallExpr(const Stmt* child, const CallExpr* callExpr, std::string& assignValue, bool& bPotentiallyAssignedTo)
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{
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if (callExpr->getCallee() == child) {
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return;
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}
|
|
const FunctionDecl* functionDecl;
|
|
if (auto memberCallExpr = dyn_cast<CXXMemberCallExpr>(callExpr)) {
|
|
functionDecl = memberCallExpr->getMethodDecl();
|
|
} else {
|
|
functionDecl = callExpr->getDirectCallee();
|
|
}
|
|
if (functionDecl) {
|
|
if (auto operatorCallExpr = dyn_cast<CXXOperatorCallExpr>(callExpr)) {
|
|
if (operatorCallExpr->getArg(0) == child) {
|
|
const CXXMethodDecl* calleeMethodDecl = dyn_cast_or_null<CXXMethodDecl>(operatorCallExpr->getDirectCallee());
|
|
if (calleeMethodDecl) {
|
|
if (operatorCallExpr->getOperator() == OO_Equal) {
|
|
assignValue = getExprValue(operatorCallExpr->getArg(1));
|
|
bPotentiallyAssignedTo = true;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
for (unsigned i = 0; i < callExpr->getNumArgs(); ++i) {
|
|
if (i >= functionDecl->getNumParams()) // can happen in template code
|
|
break;
|
|
if (callExpr->getArg(i) == child) {
|
|
const ParmVarDecl* parmVarDecl = functionDecl->getParamDecl(i);
|
|
QualType qt = parmVarDecl->getType().getDesugaredType(compiler.getASTContext());
|
|
if (!qt.isConstQualified() && qt->isReferenceType()) {
|
|
assignValue = "?";
|
|
bPotentiallyAssignedTo = true;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
// check for function pointers
|
|
const FieldDecl* calleeFieldDecl = dyn_cast_or_null<FieldDecl>(callExpr->getCalleeDecl());
|
|
if (!calleeFieldDecl) {
|
|
return;
|
|
}
|
|
QualType qt = calleeFieldDecl->getType().getDesugaredType(compiler.getASTContext());
|
|
if (!qt->isPointerType()) {
|
|
return;
|
|
}
|
|
qt = qt->getPointeeType().getDesugaredType(compiler.getASTContext());
|
|
const FunctionProtoType* proto = qt->getAs<FunctionProtoType>();
|
|
if (!proto) {
|
|
return;
|
|
}
|
|
for (unsigned i = 0; i < callExpr->getNumArgs(); ++i) {
|
|
if (i >= proto->getNumParams()) // can happen in template code
|
|
break;
|
|
if (callExpr->getArg(i) == child) {
|
|
QualType qt = proto->getParamType(i).getDesugaredType(compiler.getASTContext());
|
|
if (!qt.isConstQualified() && qt->isReferenceType()) {
|
|
assignValue = "?";
|
|
bPotentiallyAssignedTo = true;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
std::string SingleValFields::getExprValue(const Expr* arg)
|
|
{
|
|
if (!arg)
|
|
return "?";
|
|
arg = arg->IgnoreParenCasts();
|
|
arg = arg->IgnoreImplicit();
|
|
// ignore this, it seems to trigger an infinite recursion
|
|
if (isa<UnaryExprOrTypeTraitExpr>(arg))
|
|
return "?";
|
|
if (arg->isValueDependent())
|
|
return "?";
|
|
// for stuff like: OUString foo = "xxx";
|
|
if (auto stringLiteral = dyn_cast<clang::StringLiteral>(arg))
|
|
{
|
|
if (stringLiteral->getCharByteWidth() == 1)
|
|
return stringLiteral->getString().str();
|
|
return "?";
|
|
}
|
|
// ParenListExpr containing a CXXNullPtrLiteralExpr and has a NULL type pointer
|
|
if (auto parenListExpr = dyn_cast<ParenListExpr>(arg))
|
|
{
|
|
if (parenListExpr->getNumExprs() == 1)
|
|
return getExprValue(parenListExpr->getExpr(0));
|
|
return "?";
|
|
}
|
|
if (auto constructExpr = dyn_cast<CXXConstructExpr>(arg))
|
|
{
|
|
if (constructExpr->getNumArgs() >= 1
|
|
&& isa<clang::StringLiteral>(constructExpr->getArg(0)))
|
|
{
|
|
auto stringLiteral = dyn_cast<clang::StringLiteral>(constructExpr->getArg(0));
|
|
if (stringLiteral->getCharByteWidth() == 1)
|
|
return stringLiteral->getString().str();
|
|
return "?";
|
|
}
|
|
}
|
|
if (arg->getType()->isFloatingType())
|
|
{
|
|
APFloat x1(0.0f);
|
|
if (arg->EvaluateAsFloat(x1, compiler.getASTContext()))
|
|
{
|
|
std::string s;
|
|
llvm::raw_string_ostream os(s);
|
|
x1.print(os);
|
|
return os.str();
|
|
}
|
|
}
|
|
APSInt x1;
|
|
if (compat::EvaluateAsInt(arg, x1, compiler.getASTContext()))
|
|
return compat::toString(x1, 10);
|
|
if (isa<CXXNullPtrLiteralExpr>(arg))
|
|
return "0";
|
|
return "?";
|
|
}
|
|
|
|
loplugin::Plugin::Registration< SingleValFields > X("singlevalfields", false);
|
|
|
|
}
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|