45de338f1b
This is a mess. The version is AUR is still outdated and also doesn't install anymore. Fedora 38 carries the latest version of it so use that now. Keep the old steps in case we need to switch again in the future.
468 lines
18 KiB
C++
468 lines
18 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2023 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#include "checkunusedfunctions.h"
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#include "astutils.h"
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#include "errorlogger.h"
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#include "errortypes.h"
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#include "library.h"
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#include "settings.h"
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#include "symboldatabase.h"
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#include "token.h"
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#include "tokenize.h"
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#include "tokenlist.h"
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#include "utils.h"
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#include <algorithm>
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#include <cctype>
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#include <cstring>
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#include <fstream> // IWYU pragma: keep
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#include <map>
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#include <sstream> // IWYU pragma: keep
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#include <tuple>
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#include <utility>
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#include <vector>
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#include <tinyxml2.h>
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namespace CTU {
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class FileInfo;
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}
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//---------------------------------------------------------------------------
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// Register this check class
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CheckUnusedFunctions CheckUnusedFunctions::instance;
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static const struct CWE CWE561(561U); // Dead Code
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static std::string stripTemplateParameters(const std::string& funcName) {
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std::string name = funcName;
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const auto pos = name.find('<');
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if (pos > 0 && pos != std::string::npos)
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name.erase(pos - 1);
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return name;
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}
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//---------------------------------------------------------------------------
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// FUNCTION USAGE - Check for unused functions etc
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//---------------------------------------------------------------------------
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void CheckUnusedFunctions::parseTokens(const Tokenizer &tokenizer, const char FileName[], const Settings *settings)
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{
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const bool doMarkup = settings->library.markupFile(FileName);
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// Function declarations..
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if (!doMarkup) {
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const SymbolDatabase* symbolDatabase = tokenizer.getSymbolDatabase();
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for (const Scope* scope : symbolDatabase->functionScopes) {
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const Function* func = scope->function;
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if (!func || !func->token || scope->bodyStart->fileIndex() != 0)
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continue;
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// Don't warn about functions that are marked by __attribute__((constructor)) or __attribute__((destructor))
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if (func->isAttributeConstructor() || func->isAttributeDestructor() || func->type != Function::eFunction || func->isOperator())
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continue;
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if (func->isExtern())
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continue;
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mFunctionDecl.emplace_back(func);
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FunctionUsage &usage = mFunctions[stripTemplateParameters(func->name())];
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if (!usage.lineNumber)
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usage.lineNumber = func->token->linenr();
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// No filename set yet..
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if (usage.filename.empty()) {
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usage.filename = tokenizer.list.getSourceFilePath();
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}
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// Multiple files => filename = "+"
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else if (usage.filename != tokenizer.list.getSourceFilePath()) {
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//func.filename = "+";
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usage.usedOtherFile |= usage.usedSameFile;
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}
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}
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}
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// Function usage..
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const Token *lambdaEndToken = nullptr;
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for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
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if (tok == lambdaEndToken)
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lambdaEndToken = nullptr;
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else if (!lambdaEndToken && tok->str() == "[")
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lambdaEndToken = findLambdaEndToken(tok);
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// parsing of library code to find called functions
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if (settings->library.isexecutableblock(FileName, tok->str())) {
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const Token * markupVarToken = tok->tokAt(settings->library.blockstartoffset(FileName));
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// not found
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if (!markupVarToken)
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continue;
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int scope = 0;
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bool start = true;
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// find all function calls in library code (starts with '(', not if or while etc)
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while ((scope || start) && markupVarToken) {
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if (markupVarToken->str() == settings->library.blockstart(FileName)) {
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scope++;
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start = false;
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} else if (markupVarToken->str() == settings->library.blockend(FileName))
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scope--;
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else if (!settings->library.iskeyword(FileName, markupVarToken->str())) {
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mFunctionCalls.insert(markupVarToken->str());
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if (mFunctions.find(markupVarToken->str()) != mFunctions.end())
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mFunctions[markupVarToken->str()].usedOtherFile = true;
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else if (markupVarToken->next()->str() == "(") {
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FunctionUsage &func = mFunctions[markupVarToken->str()];
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func.filename = tokenizer.list.getSourceFilePath();
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if (func.filename.empty() || func.filename == "+")
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func.usedOtherFile = true;
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else
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func.usedSameFile = true;
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}
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}
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markupVarToken = markupVarToken->next();
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}
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}
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if (!doMarkup // only check source files
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&& settings->library.isexporter(tok->str()) && tok->next() != nullptr) {
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const Token * propToken = tok->next();
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while (propToken && propToken->str() != ")") {
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if (settings->library.isexportedprefix(tok->str(), propToken->str())) {
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const Token* nextPropToken = propToken->next();
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const std::string& value = nextPropToken->str();
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if (mFunctions.find(value) != mFunctions.end()) {
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mFunctions[value].usedOtherFile = true;
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}
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mFunctionCalls.insert(value);
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}
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if (settings->library.isexportedsuffix(tok->str(), propToken->str())) {
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const Token* prevPropToken = propToken->previous();
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const std::string& value = prevPropToken->str();
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if (value != ")" && mFunctions.find(value) != mFunctions.end()) {
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mFunctions[value].usedOtherFile = true;
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}
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mFunctionCalls.insert(value);
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}
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propToken = propToken->next();
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}
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}
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if (doMarkup && settings->library.isimporter(FileName, tok->str()) && tok->next()) {
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const Token * propToken = tok->next();
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if (propToken->next()) {
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propToken = propToken->next();
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while (propToken && propToken->str() != ")") {
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const std::string& value = propToken->str();
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if (!value.empty()) {
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mFunctions[value].usedOtherFile = true;
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mFunctionCalls.insert(value);
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break;
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}
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propToken = propToken->next();
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}
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}
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}
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if (settings->library.isreflection(tok->str())) {
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const int argIndex = settings->library.reflectionArgument(tok->str());
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if (argIndex >= 0) {
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const Token * funcToken = tok->next();
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int index = 0;
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std::string value;
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while (funcToken) {
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if (funcToken->str()==",") {
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if (++index == argIndex)
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break;
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value.clear();
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} else
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value += funcToken->str();
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funcToken = funcToken->next();
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}
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if (index == argIndex) {
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value = value.substr(1, value.length() - 2);
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mFunctions[value].usedOtherFile = true;
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mFunctionCalls.insert(std::move(value));
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}
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}
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}
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const Token *funcname = nullptr;
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if (doMarkup)
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funcname = Token::Match(tok, "%name% (") ? tok : nullptr;
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else if ((lambdaEndToken || tok->scope()->isExecutable()) && Token::Match(tok, "%name% (")) {
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funcname = tok;
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} else if ((lambdaEndToken || tok->scope()->isExecutable()) && Token::Match(tok, "%name% <") && Token::simpleMatch(tok->linkAt(1), "> (")) {
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funcname = tok;
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} else if (Token::Match(tok, "< %name%") && tok->link()) {
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funcname = tok->next();
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while (Token::Match(funcname, "%name% :: %name%"))
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funcname = funcname->tokAt(2);
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} else if (tok->scope()->type != Scope::ScopeType::eEnum && (Token::Match(tok, "[;{}.,()[=+-/|!?:]") || Token::Match(tok, "return|throw"))) {
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funcname = tok->next();
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if (funcname && funcname->str() == "&")
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funcname = funcname->next();
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if (funcname && funcname->str() == "::")
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funcname = funcname->next();
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while (Token::Match(funcname, "%name% :: %name%"))
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funcname = funcname->tokAt(2);
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if (!Token::Match(funcname, "%name% [(),;]:}>]") || funcname->varId())
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continue;
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}
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if (!funcname || funcname->isKeyword() || funcname->isStandardType())
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continue;
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// funcname ( => Assert that the end parentheses isn't followed by {
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if (Token::Match(funcname, "%name% (|<")) {
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const Token *ftok = funcname->next();
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if (ftok->str() == "<")
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ftok = ftok->link();
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if (Token::Match(ftok->linkAt(1), ") const|throw|{"))
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funcname = nullptr;
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}
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if (funcname) {
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const auto baseName = stripTemplateParameters(funcname->str());
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FunctionUsage &func = mFunctions[baseName];
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const std::string& called_from_file = tokenizer.list.getSourceFilePath();
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if (func.filename.empty() || func.filename == "+" || func.filename != called_from_file)
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func.usedOtherFile = true;
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else
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func.usedSameFile = true;
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mFunctionCalls.insert(baseName);
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}
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}
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}
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static bool isOperatorFunction(const std::string & funcName)
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{
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/* Operator functions are invalid function names for C, so no need to check
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* this in here. As result the returned error function might be incorrect.
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*
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* List of valid operators can be found at:
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* http://en.cppreference.com/w/cpp/language/operators
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*
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* Conversion functions must be a member function (at least for gcc), so no
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* need to cover them for unused functions.
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*
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* To speed up the comparison, not the whole list of operators is used.
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* Instead only the character after the operator prefix is checked to be a
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* none alpa numeric value, but the '_', to cover function names like
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* "operator_unused". In addition the following valid operators are checked:
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* - new
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* - new[]
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* - delete
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* - delete[]
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*/
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const std::string operatorPrefix = "operator";
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if (funcName.compare(0, operatorPrefix.length(), operatorPrefix) != 0) {
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return false;
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}
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// Taking care of funcName == "operator", which is no valid operator
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if (funcName.length() == operatorPrefix.length()) {
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return false;
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}
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const char firstOperatorChar = funcName[operatorPrefix.length()];
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if (firstOperatorChar == '_') {
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return false;
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}
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if (!std::isalnum(firstOperatorChar)) {
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return true;
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}
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const std::vector<std::string> additionalOperators = {
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"new", "new[]", "delete", "delete[]"
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};
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return std::find(additionalOperators.cbegin(), additionalOperators.cend(), funcName.substr(operatorPrefix.length())) != additionalOperators.cend();
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}
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bool CheckUnusedFunctions::check(ErrorLogger * const errorLogger, const Settings& settings) const
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{
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using ErrorParams = std::tuple<std::string, unsigned int, std::string>;
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std::vector<ErrorParams> errors; // ensure well-defined order
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for (std::unordered_map<std::string, FunctionUsage>::const_iterator it = mFunctions.cbegin(); it != mFunctions.cend(); ++it) {
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const FunctionUsage &func = it->second;
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if (func.usedOtherFile || func.filename.empty())
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continue;
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if (settings.library.isentrypoint(it->first))
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continue;
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if (!func.usedSameFile) {
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if (isOperatorFunction(it->first))
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continue;
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std::string filename;
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if (func.filename != "+")
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filename = func.filename;
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errors.emplace_back(filename, func.lineNumber, it->first);
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} else if (!func.usedOtherFile) {
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/** @todo add error message "function is only used in <file> it can be static" */
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/*
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std::ostringstream errmsg;
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errmsg << "The function '" << it->first << "' is only used in the file it was declared in so it should have local linkage.";
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mErrorLogger->reportErr( errmsg.str() );
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errors = true;
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*/
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}
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}
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std::sort(errors.begin(), errors.end());
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for (const auto& e : errors)
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unusedFunctionError(errorLogger, std::get<0>(e), std::get<1>(e), std::get<2>(e));
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return !errors.empty();
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}
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void CheckUnusedFunctions::unusedFunctionError(ErrorLogger * const errorLogger,
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const std::string &filename, unsigned int lineNumber,
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const std::string &funcname)
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{
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std::list<ErrorMessage::FileLocation> locationList;
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if (!filename.empty()) {
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locationList.emplace_back(filename, lineNumber);
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}
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const ErrorMessage errmsg(locationList, emptyString, Severity::style, "$symbol:" + funcname + "\nThe function '$symbol' is never used.", "unusedFunction", CWE561, Certainty::normal);
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if (errorLogger)
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errorLogger->reportErr(errmsg);
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else
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reportError(errmsg);
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}
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Check::FileInfo *CheckUnusedFunctions::getFileInfo(const Tokenizer *tokenizer, const Settings *settings) const
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{
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if (!settings->checks.isEnabled(Checks::unusedFunction))
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return nullptr;
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if (settings->useSingleJob() && settings->buildDir.empty())
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instance.parseTokens(*tokenizer, tokenizer->list.getFiles().front().c_str(), settings);
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return nullptr;
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}
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bool CheckUnusedFunctions::analyseWholeProgram(const CTU::FileInfo *ctu, const std::list<Check::FileInfo*> &fileInfo, const Settings& settings, ErrorLogger &errorLogger)
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{
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(void)ctu;
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(void)fileInfo;
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return check(&errorLogger, settings);
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}
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CheckUnusedFunctions::FunctionDecl::FunctionDecl(const Function *f)
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: functionName(f->name()), lineNumber(f->token->linenr())
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{}
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std::string CheckUnusedFunctions::analyzerInfo() const
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{
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std::ostringstream ret;
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for (const FunctionDecl &functionDecl : mFunctionDecl) {
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ret << " <functiondecl"
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<< " functionName=\"" << ErrorLogger::toxml(functionDecl.functionName) << '\"'
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<< " lineNumber=\"" << functionDecl.lineNumber << "\"/>\n";
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}
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for (const std::string &fc : mFunctionCalls) {
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ret << " <functioncall functionName=\"" << ErrorLogger::toxml(fc) << "\"/>\n";
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}
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return ret.str();
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}
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namespace {
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struct Location {
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Location() : lineNumber(0) {}
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Location(std::string f, const int l) : fileName(std::move(f)), lineNumber(l) {}
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std::string fileName;
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int lineNumber;
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};
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}
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void CheckUnusedFunctions::analyseWholeProgram(const Settings &settings, ErrorLogger * const errorLogger, const std::string &buildDir)
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{
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std::map<std::string, Location> decls;
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std::set<std::string> calls;
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const std::string filesTxt(buildDir + "/files.txt");
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std::ifstream fin(filesTxt.c_str());
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std::string filesTxtLine;
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while (std::getline(fin, filesTxtLine)) {
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const std::string::size_type firstColon = filesTxtLine.find(':');
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if (firstColon == std::string::npos)
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continue;
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const std::string::size_type secondColon = filesTxtLine.find(':', firstColon+1);
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if (secondColon == std::string::npos)
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continue;
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const std::string xmlfile = buildDir + '/' + filesTxtLine.substr(0,firstColon);
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const std::string sourcefile = filesTxtLine.substr(secondColon+1);
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tinyxml2::XMLDocument doc;
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const tinyxml2::XMLError error = doc.LoadFile(xmlfile.c_str());
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if (error != tinyxml2::XML_SUCCESS)
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continue;
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const tinyxml2::XMLElement * const rootNode = doc.FirstChildElement();
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if (rootNode == nullptr)
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continue;
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for (const tinyxml2::XMLElement *e = rootNode->FirstChildElement(); e; e = e->NextSiblingElement()) {
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if (std::strcmp(e->Name(), "FileInfo") != 0)
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continue;
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const char *checkattr = e->Attribute("check");
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if (checkattr == nullptr || std::strcmp(checkattr,"CheckUnusedFunctions") != 0)
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continue;
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for (const tinyxml2::XMLElement *e2 = e->FirstChildElement(); e2; e2 = e2->NextSiblingElement()) {
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const char* functionName = e2->Attribute("functionName");
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if (functionName == nullptr)
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continue;
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if (std::strcmp(e2->Name(),"functioncall") == 0) {
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calls.insert(functionName);
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continue;
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}
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if (std::strcmp(e2->Name(),"functiondecl") == 0) {
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const char* lineNumber = e2->Attribute("lineNumber");
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if (lineNumber)
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decls[functionName] = Location(sourcefile, strToInt<int>(lineNumber));
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}
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}
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}
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}
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for (std::map<std::string, Location>::const_iterator decl = decls.cbegin(); decl != decls.cend(); ++decl) {
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const std::string &functionName = stripTemplateParameters(decl->first);
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if (settings.library.isentrypoint(functionName))
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continue;
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if (calls.find(functionName) == calls.end() && !isOperatorFunction(functionName)) {
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const Location &loc = decl->second;
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unusedFunctionError(errorLogger, loc.fileName, loc.lineNumber, functionName);
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}
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}
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}
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