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cppcheck/lib/checkinternal.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2015 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef CHECK_INTERNAL
#include "checkinternal.h"
#include "symboldatabase.h"
#include <string>
#include <set>
#include <cstring>
#include <cctype>
// Register this check class (by creating a static instance of it).
// Disabled in release builds
namespace {
CheckInternal instance;
}
void CheckInternal::checkTokenMatchPatterns()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
if (!Token::simpleMatch(tok, "Token :: Match (") && !Token::simpleMatch(tok, "Token :: findmatch ("))
continue;
const std::string& funcname = tok->strAt(2);
// Get pattern string
const Token *pattern_tok = tok->tokAt(4)->nextArgument();
if (!pattern_tok || pattern_tok->type() != Token::eString)
continue;
const std::string pattern = pattern_tok->strValue();
if (pattern.empty()) {
simplePatternError(tok, pattern, funcname);
continue;
}
const char *p = pattern.c_str();
while (*p) {
while (*p && std::isspace(*p))
p++;
const char *start = p;
while (*p && !std::isspace(*p))
p++;
const char *end = p - 1;
if (start < end && !(*start == '[' && *end == ']')) {
bool cmd = (*start=='%' && std::isalpha(*(start+1)));
// check multicompare pattern..
for (const char *s = start; s != end; s++) {
if (*s == '|') {
if (!(*(s+1) == '%' && std::isalpha(*(s+2)))) {
cmd = false;
} else if (!cmd &&
std::strncmp(s+1,"%op%",4)!=0 &&
std::strncmp(s+1,"%or%",4)!=0 &&
std::strncmp(s+1,"%cop%",5)!=0 &&
std::strncmp(s+1,"%var%",5)!=0 &&
std::strncmp(s+1,"%oror%",6)!=0) {
multiComparePatternError(tok, pattern, funcname);
}
}
}
}
}
if (pattern.find("||") != std::string::npos || pattern.find(" | ") != std::string::npos || pattern[0] == '|' || (pattern[pattern.length() - 1] == '|' && pattern[pattern.length() - 2] == ' '))
orInComplexPattern(tok, pattern, funcname);
// Check for signs of complex patterns
if (pattern.find_first_of("[|") != std::string::npos)
continue;
else if (pattern.find("!!") != std::string::npos)
continue;
bool complex = false;
size_t index = pattern.find('%');
while (index != std::string::npos) {
if (pattern.length() <= index + 2) {
complex = true;
break;
}
if (pattern[index + 1] == 'o' && pattern[index + 2] == 'r') // %or% or %oror%
index = pattern.find('%', index + 1);
else {
complex = true;
break;
}
index = pattern.find('%', index+1);
}
if (!complex)
simplePatternError(tok, pattern, funcname);
}
}
void CheckInternal::checkTokenSimpleMatchPatterns()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
if (!Token::simpleMatch(tok, "Token :: simpleMatch (") && !Token::simpleMatch(tok, "Token :: findsimplematch ("))
continue;
const std::string& funcname = tok->strAt(2);
// Get pattern string
const Token *pattern_tok = tok->tokAt(4)->nextArgument();
if (!pattern_tok || pattern_tok->type() != Token::eString)
continue;
const std::string pattern = pattern_tok->strValue();
if (pattern.empty()) {
complexPatternError(tok, pattern, funcname);
continue;
}
// Check for [xyz] usage - but exclude standalone square brackets
unsigned int char_count = 0;
for (std::string::size_type pos = 0; pos < pattern.size(); ++pos) {
char c = pattern[pos];
if (c == ' ') {
char_count = 0;
} else if (c == ']') {
if (char_count > 0) {
complexPatternError(tok, pattern, funcname);
continue;
}
} else {
++char_count;
}
}
// Check | usage: Count characters before the symbol
char_count = 0;
for (std::string::size_type pos = 0; pos < pattern.size(); ++pos) {
char c = pattern[pos];
if (c == ' ') {
char_count = 0;
} else if (c == '|') {
if (char_count > 0) {
complexPatternError(tok, pattern, funcname);
continue;
}
} else {
++char_count;
}
}
// Check for real errors
if (pattern.length() > 1) {
for (size_t i = 0; i < pattern.length() - 1; i++) {
if (pattern[i] == '%' && pattern[i + 1] != ' ')
complexPatternError(tok, pattern, funcname);
else if (pattern[i] == '!' && pattern[i + 1] == '!')
complexPatternError(tok, pattern, funcname);
}
}
}
}
void CheckInternal::checkMissingPercentCharacter()
{
static std::set<std::string> magics;
if (magics.empty()) {
magics.insert("%any%");
magics.insert("%bool%");
magics.insert("%char%");
magics.insert("%comp%");
magics.insert("%num%");
magics.insert("%op%");
magics.insert("%cop%");
magics.insert("%or%");
magics.insert("%oror%");
magics.insert("%str%");
magics.insert("%type%");
magics.insert("%var%");
magics.insert("%varid%");
}
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
if (!Token::simpleMatch(tok, "Token :: Match (") && !Token::simpleMatch(tok, "Token :: findmatch ("))
continue;
const std::string& funcname = tok->strAt(2);
// Get pattern string
const Token *pattern_tok = tok->tokAt(4)->nextArgument();
if (!pattern_tok || pattern_tok->type() != Token::eString)
continue;
const std::string pattern = pattern_tok->strValue();
std::set<std::string>::const_iterator magic, magics_end = magics.end();
for (magic = magics.begin(); magic != magics_end; ++magic) {
const std::string broken_magic = (*magic).substr(0, (*magic).size()-1);
std::string::size_type pos = 0;
while ((pos = pattern.find(broken_magic, pos)) != std::string::npos) {
// Check if it's the full pattern
if (pattern.find(*magic, pos) != pos) {
// Known whitelist of substrings
if ((broken_magic == "%var" && pattern.find("%varid%", pos) == pos) ||
(broken_magic == "%or" && pattern.find("%oror%", pos) == pos)) {
++pos;
continue;
}
missingPercentCharacterError(tok, pattern, funcname);
}
++pos;
}
}
}
}
void CheckInternal::checkUnknownPattern()
{
static std::set<std::string> knownPatterns;
if (knownPatterns.empty()) {
knownPatterns.insert("%any%");
knownPatterns.insert("%bool%");
knownPatterns.insert("%char%");
knownPatterns.insert("%comp%");
knownPatterns.insert("%num%");
knownPatterns.insert("%op%");
knownPatterns.insert("%cop%");
knownPatterns.insert("%or%");
knownPatterns.insert("%oror%");
knownPatterns.insert("%str%");
knownPatterns.insert("%type%");
knownPatterns.insert("%var%");
knownPatterns.insert("%varid%");
}
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
if (!Token::simpleMatch(tok, "Token :: Match (") && !Token::simpleMatch(tok, "Token :: findmatch ("))
continue;
// Get pattern string
const Token *pattern_tok = tok->tokAt(4)->nextArgument();
if (!pattern_tok || pattern_tok->type() != Token::eString)
continue;
const std::string pattern = pattern_tok->strValue();
bool inBrackets = false;
for (std::string::size_type i = 0; i < pattern.length()-1; i++) {
if (pattern[i] == '[' && (i == 0 || pattern[i-1] == ' '))
inBrackets = true;
else if (pattern[i] == ']')
inBrackets = false;
else if (pattern[i] == '%' && pattern[i+1] != ' ' && pattern[i+1] != '|' && !inBrackets) {
std::string::size_type end = pattern.find('%', i+1);
if (end != std::string::npos) {
std::string s = pattern.substr(i, end-i+1);
if (knownPatterns.find(s) == knownPatterns.end())
unknownPatternError(tok, s);
}
}
}
}
}
void CheckInternal::checkRedundantNextPrevious()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
if (Token::Match(tok, ". previous ( ) . next|tokAt|strAt|linkAt (") || Token::Match(tok, ". next ( ) . previous|tokAt|strAt|linkAt (") ||
(Token::simpleMatch(tok, ". tokAt (") && Token::Match(tok->linkAt(2), ") . previous|next|tokAt|strAt|linkAt|str|link ("))) {
const std::string& func1 = tok->strAt(1);
const std::string& func2 = tok->linkAt(2)->strAt(2);
if ((func2 == "previous" || func2 == "next" || func2 == "str" || func2 == "link") && tok->linkAt(2)->strAt(4) != ")")
continue;
redundantNextPreviousError(tok, func1, func2);
} else if (Token::Match(tok, ". next|previous ( ) . next|previous ( ) . next|previous|linkAt|strAt|link|str (")) {
const std::string& func1 = tok->strAt(1);
const std::string& func2 = tok->strAt(9);
if ((func2 == "previous" || func2 == "next" || func2 == "str" || func2 == "link") && tok->strAt(11) != ")")
continue;
redundantNextPreviousError(tok, func1, func2);
}
}
}
void CheckInternal::checkExtraWhitespace()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
if (!Token::simpleMatch(tok, "Token :: simpleMatch (") &&
!Token::simpleMatch(tok, "Token :: findsimplematch (") &&
!Token::simpleMatch(tok, "Token :: Match (") &&
!Token::simpleMatch(tok, "Token :: findmatch ("))
continue;
const std::string& funcname = tok->strAt(2);
// Get pattern string
const Token *pattern_tok = tok->tokAt(4)->nextArgument();
if (!pattern_tok || pattern_tok->type() != Token::eString)
continue;
const std::string pattern = pattern_tok->strValue();
if (!pattern.empty() && (pattern[0] == ' ' || *pattern.rbegin() == ' '))
extraWhitespaceError(tok, pattern, funcname);
// two whitespaces or more
if (pattern.find(" ") != std::string::npos)
extraWhitespaceError(tok, pattern, funcname);
}
}
void CheckInternal::multiComparePatternError(const Token* tok, const std::string& pattern, const std::string &funcname)
{
reportError(tok, Severity::error, "multiComparePatternError",
"Bad multicompare pattern (a %cmd% must be first unless it is %or%,%op%,%cop%,%var%,%oror%) inside Token::" + funcname + "() call: \"" + pattern + "\""
);
}
void CheckInternal::simplePatternError(const Token* tok, const std::string& pattern, const std::string &funcname)
{
reportError(tok, Severity::warning, "simplePatternError",
"Found simple pattern inside Token::" + funcname + "() call: \"" + pattern + "\""
);
}
void CheckInternal::complexPatternError(const Token* tok, const std::string& pattern, const std::string &funcname)
{
reportError(tok, Severity::error, "complexPatternError",
"Found complex pattern inside Token::" + funcname + "() call: \"" + pattern + "\""
);
}
void CheckInternal::missingPercentCharacterError(const Token* tok, const std::string& pattern, const std::string& funcname)
{
reportError(tok, Severity::error, "missingPercentCharacter",
"Missing percent end character in Token::" + funcname + "() pattern: \"" + pattern + "\""
);
}
void CheckInternal::unknownPatternError(const Token* tok, const std::string& pattern)
{
reportError(tok, Severity::error, "unknownPattern",
"Unknown pattern used: \"" + pattern + "\"");
}
void CheckInternal::redundantNextPreviousError(const Token* tok, const std::string& func1, const std::string& func2)
{
reportError(tok, Severity::style, "redundantNextPrevious",
"Call to 'Token::" + func1 + "()' followed by 'Token::" + func2 + "()' can be simplified.");
}
void CheckInternal::orInComplexPattern(const Token* tok, const std::string& pattern, const std::string &funcname)
{
reportError(tok, Severity::error, "orInComplexPattern",
"Token::" + funcname + "() pattern \"" + pattern + "\" contains \"||\" or \"|\". Replace it by \"%oror%\" or \"%or%\".");
}
void CheckInternal::extraWhitespaceError(const Token* tok, const std::string& pattern, const std::string &funcname)
{
reportError(tok, Severity::warning, "extraWhitespaceError",
"Found extra whitespace inside Token::" + funcname + "() call: \"" + pattern + "\""
);
}
#endif // #ifdef CHECK_INTERNAL
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