121 lines
4.8 KiB
C++
121 lines
4.8 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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#ifndef checktypeH
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#define checktypeH
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//---------------------------------------------------------------------------
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#include "check.h"
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#include "config.h"
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#include "tokenize.h"
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#include "vfvalue.h"
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#include <list>
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#include <string>
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class ErrorLogger;
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class Settings;
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class Token;
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class ValueType;
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/// @addtogroup Checks
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/// @{
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/** @brief Various small checks */
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class CPPCHECKLIB CheckType : public Check {
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public:
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/** @brief This constructor is used when registering the CheckClass */
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CheckType() : Check(myName()) {}
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private:
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/** @brief This constructor is used when running checks. */
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CheckType(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {}
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/** @brief Run checks against the normal token list */
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void runChecks(const Tokenizer &tokenizer, ErrorLogger *errorLogger) override {
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// These are not "simplified" because casts can't be ignored
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CheckType checkType(&tokenizer, tokenizer.getSettings(), errorLogger);
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checkType.checkTooBigBitwiseShift();
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checkType.checkIntegerOverflow();
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checkType.checkSignConversion();
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checkType.checkLongCast();
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checkType.checkFloatToIntegerOverflow();
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}
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/** @brief %Check for bitwise shift with too big right operand */
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void checkTooBigBitwiseShift();
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/** @brief %Check for integer overflow */
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void checkIntegerOverflow();
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/** @brief %Check for dangerous sign conversion */
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void checkSignConversion();
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/** @brief %Check for implicit long cast of int result */
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void checkLongCast();
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/** @brief %Check for float to integer overflow */
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void checkFloatToIntegerOverflow();
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void checkFloatToIntegerOverflow(const Token *tok, const ValueType *vtint, const ValueType *vtfloat, const std::list<ValueFlow::Value> &floatValues);
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// Error messages..
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void tooBigBitwiseShiftError(const Token *tok, int lhsbits, const ValueFlow::Value &rhsbits);
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void tooBigSignedBitwiseShiftError(const Token *tok, int lhsbits, const ValueFlow::Value &rhsbits);
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void integerOverflowError(const Token *tok, const ValueFlow::Value &value);
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void signConversionError(const Token *tok, const ValueFlow::Value *negativeValue, const bool constvalue);
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void longCastAssignError(const Token *tok, const ValueType* src = nullptr, const ValueType* tgt = nullptr);
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void longCastReturnError(const Token *tok, const ValueType* src = nullptr, const ValueType* tgt = nullptr);
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void floatToIntegerOverflowError(const Token *tok, const ValueFlow::Value &value);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const override {
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CheckType c(nullptr, settings, errorLogger);
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c.tooBigBitwiseShiftError(nullptr, 32, ValueFlow::Value(64));
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c.tooBigSignedBitwiseShiftError(nullptr, 31, ValueFlow::Value(31));
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c.integerOverflowError(nullptr, ValueFlow::Value(1LL<<32));
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c.signConversionError(nullptr, nullptr, false);
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c.longCastAssignError(nullptr);
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c.longCastReturnError(nullptr);
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ValueFlow::Value f;
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f.valueType = ValueFlow::Value::ValueType::FLOAT;
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f.floatValue = 1E100;
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c.floatToIntegerOverflowError(nullptr, f);
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}
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static std::string myName() {
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return "Type";
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}
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std::string classInfo() const override {
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return "Type checks\n"
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"- bitwise shift by too many bits (only enabled when --platform is used)\n"
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"- signed integer overflow (only enabled when --platform is used)\n"
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"- dangerous sign conversion, when signed value can be negative\n"
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"- possible loss of information when assigning int result to long variable\n"
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"- possible loss of information when returning int result as long return value\n"
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"- float conversion overflow\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checktypeH
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