cppcheck/lib/exprengine.h

220 lines
6.8 KiB
C++

/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2019 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/>.
*/
//---------------------------------------------------------------------------
#ifndef exprengineH
#define exprengineH
//---------------------------------------------------------------------------
#include "config.h"
#include <functional>
#include <map>
#include <memory>
#include <set>
#include <string>
#include <vector>
#include <stdint.h>
class ErrorLogger;
class Tokenizer;
class Scope;
class Settings;
class Token;
#ifdef __GNUC__
typedef __int128_t int128_t;
#else
typedef long long int128_t;
#ifdef _MSC_VER
#pragma message(__FILE__ "(" _CRT_STRINGIZE(__LINE__) ")" ": warning: TODO No 128-bit integer type is available => Limited analysis of large integers...")
#else
#warning TODO No 128-bit integer type is available => Limited analysis of large integers
#endif
#endif
namespace ExprEngine {
std::string str(int128_t);
// TODO we need to handle floats, containers, pointers, aliases and structs and stuff
enum class ValueType { UninitValue, IntRange, PointerValue, ArrayValue, StructValue, AddressOfValue, BinOpResult };
class Value;
typedef std::shared_ptr<Value> ValuePtr;
class Value {
public:
Value(const std::string &name) : name(name) {}
virtual ~Value() {}
virtual ValueType type() const = 0;
virtual std::string getRange() const = 0;
virtual bool isIntValueInRange(int value) const {
(void)value;
return false;
}
const std::string name;
};
class UninitValue: public Value {
public:
UninitValue() : Value("?") {}
ValueType type() const override {
return ValueType::UninitValue;
}
std::string getRange() const override {
return "?";
}
};
class IntRange : public Value {
public:
IntRange(const std::string &name, int128_t minValue, int128_t maxValue)
: Value(name)
, minValue(minValue)
, maxValue(maxValue) {
}
~IntRange() {}
ValueType type() const override {
return ValueType::IntRange;
}
std::string getRange() const override {
return "[" + str(minValue) + ":" + str(maxValue) + "]";
}
bool isIntValueInRange(int value) const override {
return value >= minValue && value <= maxValue;
}
int128_t minValue;
int128_t maxValue;
};
class PointerValue: public Value {
public:
PointerValue(const std::string &name, ValuePtr data) : Value(name), data(data) {}
ValueType type() const override {
return ValueType::PointerValue;
}
std::string getRange() const override {
return "*" + data->getRange();
}
ValuePtr data;
};
class ArrayValue: public Value {
public:
const int MAXSIZE = 0x100000;
ArrayValue(const std::string &name, size_t size)
: Value(name) {
data.resize((size < MAXSIZE) ? size : MAXSIZE,
std::make_shared<UninitValue>());
}
ValueType type() const override {
return ValueType::ArrayValue;
}
std::string getRange() const override {
return "[" + std::to_string(data.size()) + "]";
}
void assign(ValuePtr index, ValuePtr value);
ValuePtr read(ValuePtr index);
std::vector<ValuePtr> data;
};
class StructValue: public Value {
public:
explicit StructValue(const std::string &name) : Value(name) {}
ValueType type() const override {
return ValueType::StructValue;
}
std::string getRange() const override {
return name;
}
ValuePtr getValueOfMember(const std::string &name) const {
auto it = member.find(name);
return (it == member.end()) ? ValuePtr() : it->second;
}
std::map<std::string, ValuePtr> member;
};
class AddressOfValue: public Value {
public:
AddressOfValue(const std::string &name, int varId)
: Value(name)
, varId(varId)
{}
ValueType type() const override {
return ValueType::AddressOfValue;
}
std::string getRange() const override {
return "(&@" + std::to_string(varId);
}
int varId;
};
class BinOpResult : public Value {
public:
BinOpResult(const std::string &binop, ValuePtr op1, ValuePtr op2)
: Value("(" + op1->name + ")" + binop + "(" + op2->name + ")")
, binop(binop)
, op1(op1)
, op2(op2) {
auto b1 = std::dynamic_pointer_cast<BinOpResult>(op1);
if (b1)
mLeafs = b1->mLeafs;
else
mLeafs.insert(op1);
auto b2 = std::dynamic_pointer_cast<BinOpResult>(op2);
if (b2)
mLeafs.insert(b2->mLeafs.begin(), b2->mLeafs.end());
else
mLeafs.insert(op2);
}
ValueType type() const override {
return ValueType::BinOpResult;
}
std::string getRange() const override;
void getRange(int128_t *minValue, int128_t *maxValue) const;
bool isIntValueInRange(int value) const override;
std::string binop;
ValuePtr op1;
ValuePtr op2;
private:
int128_t evaluate(int test, const std::map<ValuePtr, int> &valueBit) const;
int128_t evaluateOperand(int test, const std::map<ValuePtr, int> &valueBit, ValuePtr value) const;
std::set<ValuePtr> mLeafs;
};
typedef std::function<void(const Token *, const ExprEngine::Value &)> Callback;
/** Execute all functions */
void CPPCHECKLIB executeAllFunctions(const Tokenizer *tokenizer, const Settings *settings, const std::vector<Callback> &callbacks);
void executeFunction(const Scope *functionScope, const Tokenizer *tokenizer, const Settings *settings, const std::vector<Callback> &callbacks);
void runChecks(ErrorLogger *errorLogger, const Tokenizer *tokenizer, const Settings *settings);
}
#endif // exprengineH