449 lines
14 KiB
C++
449 lines
14 KiB
C++
/*
|
|
* Cppcheck - A tool for static C/C++ code analysis
|
|
* Copyright (C) 2007-2021 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 valueflowH
|
|
#define valueflowH
|
|
//---------------------------------------------------------------------------
|
|
|
|
#include "astutils.h"
|
|
#include "config.h"
|
|
#include "mathlib.h"
|
|
#include "utils.h"
|
|
|
|
#include <functional>
|
|
#include <list>
|
|
#include <string>
|
|
#include <type_traits>
|
|
#include <utility>
|
|
#include <vector>
|
|
|
|
class ErrorLogger;
|
|
class Settings;
|
|
class SymbolDatabase;
|
|
class Token;
|
|
class TokenList;
|
|
class ValueType;
|
|
class Variable;
|
|
|
|
namespace ValueFlow {
|
|
struct increment {
|
|
template <class T>
|
|
void operator()(T& x) const {
|
|
x++;
|
|
}
|
|
};
|
|
struct decrement {
|
|
template <class T>
|
|
void operator()(T& x) const {
|
|
x--;
|
|
}
|
|
};
|
|
|
|
struct less {
|
|
template <class T, class U>
|
|
bool operator()(const T& x, const U& y) const {
|
|
return x < y;
|
|
}
|
|
};
|
|
|
|
struct adjacent {
|
|
template <class T, class U>
|
|
bool operator()(const T& x, const U& y) const {
|
|
return std::abs(x - y) == 1;
|
|
}
|
|
};
|
|
|
|
struct equalVisitor {
|
|
template <class T, class U>
|
|
void operator()(bool& result, T x, U y) const {
|
|
result = !(x > y || x < y);
|
|
}
|
|
};
|
|
class CPPCHECKLIB Value {
|
|
public:
|
|
typedef std::pair<const Token *, std::string> ErrorPathItem;
|
|
typedef std::list<ErrorPathItem> ErrorPath;
|
|
|
|
explicit Value(long long val = 0)
|
|
: valueType(ValueType::INT),
|
|
bound(Bound::Point),
|
|
intvalue(val),
|
|
tokvalue(nullptr),
|
|
floatValue(0.0),
|
|
moveKind(MoveKind::NonMovedVariable),
|
|
varvalue(val),
|
|
condition(nullptr),
|
|
varId(0U),
|
|
safe(false),
|
|
conditional(false),
|
|
defaultArg(false),
|
|
indirect(0),
|
|
path(0),
|
|
lifetimeKind(LifetimeKind::Object),
|
|
lifetimeScope(LifetimeScope::Local),
|
|
valueKind(ValueKind::Possible)
|
|
{}
|
|
Value(const Token *c, long long val);
|
|
|
|
bool equalValue(const ValueFlow::Value& rhs) const {
|
|
if (valueType != rhs.valueType)
|
|
return false;
|
|
switch (valueType) {
|
|
case ValueType::INT:
|
|
case ValueType::CONTAINER_SIZE:
|
|
case ValueType::BUFFER_SIZE:
|
|
case ValueType::ITERATOR_START:
|
|
case ValueType::ITERATOR_END:
|
|
if (intvalue != rhs.intvalue)
|
|
return false;
|
|
break;
|
|
case ValueType::TOK:
|
|
if (tokvalue != rhs.tokvalue)
|
|
return false;
|
|
break;
|
|
case ValueType::FLOAT:
|
|
// TODO: Write some better comparison
|
|
if (floatValue > rhs.floatValue || floatValue < rhs.floatValue)
|
|
return false;
|
|
break;
|
|
case ValueType::MOVED:
|
|
if (moveKind != rhs.moveKind)
|
|
return false;
|
|
break;
|
|
case ValueType::UNINIT:
|
|
break;
|
|
case ValueType::LIFETIME:
|
|
if (tokvalue != rhs.tokvalue)
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
template <class T, class F>
|
|
static void visitValue(T& self, F f) {
|
|
switch (self.valueType) {
|
|
case ValueType::INT:
|
|
case ValueType::BUFFER_SIZE:
|
|
case ValueType::CONTAINER_SIZE:
|
|
case ValueType::ITERATOR_START:
|
|
case ValueType::ITERATOR_END: {
|
|
f(self.intvalue);
|
|
break;
|
|
}
|
|
case ValueType::FLOAT: {
|
|
f(self.floatValue);
|
|
break;
|
|
}
|
|
case ValueType::UNINIT:
|
|
case ValueType::TOK:
|
|
case ValueType::LIFETIME:
|
|
case ValueType::MOVED:
|
|
break;
|
|
}
|
|
}
|
|
|
|
struct compareVisitor {
|
|
struct innerVisitor {
|
|
template <class Compare, class T, class U>
|
|
void operator()(bool& result, Compare compare, T x, U y) const {
|
|
result = compare(x, y);
|
|
}
|
|
};
|
|
template <class Compare, class T>
|
|
void operator()(bool& result, const Value& rhs, Compare compare, T x) const {
|
|
visitValue(rhs,
|
|
std::bind(innerVisitor{}, std::ref(result), std::move(compare), x, std::placeholders::_1));
|
|
}
|
|
};
|
|
|
|
template <class Compare>
|
|
bool compareValue(const Value& rhs, Compare compare) const {
|
|
bool result = false;
|
|
visitValue(
|
|
*this,
|
|
std::bind(compareVisitor{}, std::ref(result), std::ref(rhs), std::move(compare), std::placeholders::_1));
|
|
return result;
|
|
}
|
|
|
|
bool operator==(const Value &rhs) const {
|
|
if (!equalValue(rhs))
|
|
return false;
|
|
|
|
return varvalue == rhs.varvalue &&
|
|
condition == rhs.condition &&
|
|
varId == rhs.varId &&
|
|
conditional == rhs.conditional &&
|
|
defaultArg == rhs.defaultArg &&
|
|
indirect == rhs.indirect &&
|
|
valueKind == rhs.valueKind;
|
|
}
|
|
|
|
bool operator!=(const Value &rhs) const {
|
|
return !(*this == rhs);
|
|
}
|
|
|
|
template <class T, REQUIRES("T must be an arithmetic type", std::is_arithmetic<T>)>
|
|
bool equalTo(const T& x) const {
|
|
bool result = false;
|
|
visitValue(*this, std::bind(equalVisitor{}, std::ref(result), x, std::placeholders::_1));
|
|
return result;
|
|
}
|
|
|
|
void decreaseRange() {
|
|
if (bound == Bound::Lower)
|
|
visitValue(*this, increment{});
|
|
else if (bound == Bound::Upper)
|
|
visitValue(*this, decrement{});
|
|
}
|
|
|
|
void invertBound() {
|
|
if (bound == Bound::Lower)
|
|
bound = Bound::Upper;
|
|
else if (bound == Bound::Upper)
|
|
bound = Bound::Lower;
|
|
}
|
|
|
|
void invertRange() {
|
|
invertBound();
|
|
decreaseRange();
|
|
}
|
|
|
|
void assumeCondition(const Token* tok);
|
|
|
|
std::string infoString() const;
|
|
|
|
enum class ValueType { INT, TOK, FLOAT, MOVED, UNINIT, CONTAINER_SIZE, LIFETIME, BUFFER_SIZE, ITERATOR_START, ITERATOR_END } valueType;
|
|
bool isIntValue() const {
|
|
return valueType == ValueType::INT;
|
|
}
|
|
bool isTokValue() const {
|
|
return valueType == ValueType::TOK;
|
|
}
|
|
bool isFloatValue() const {
|
|
return valueType == ValueType::FLOAT;
|
|
}
|
|
bool isMovedValue() const {
|
|
return valueType == ValueType::MOVED;
|
|
}
|
|
bool isUninitValue() const {
|
|
return valueType == ValueType::UNINIT;
|
|
}
|
|
bool isContainerSizeValue() const {
|
|
return valueType == ValueType::CONTAINER_SIZE;
|
|
}
|
|
bool isLifetimeValue() const {
|
|
return valueType == ValueType::LIFETIME;
|
|
}
|
|
bool isBufferSizeValue() const {
|
|
return valueType == ValueType::BUFFER_SIZE;
|
|
}
|
|
bool isIteratorValue() const {
|
|
return valueType == ValueType::ITERATOR_START || valueType == ValueType::ITERATOR_END;
|
|
}
|
|
bool isIteratorStartValue() const {
|
|
return valueType == ValueType::ITERATOR_START;
|
|
}
|
|
bool isIteratorEndValue() const {
|
|
return valueType == ValueType::ITERATOR_END;
|
|
}
|
|
|
|
bool isLocalLifetimeValue() const {
|
|
return valueType == ValueType::LIFETIME && lifetimeScope == LifetimeScope::Local;
|
|
}
|
|
|
|
bool isArgumentLifetimeValue() const {
|
|
return valueType == ValueType::LIFETIME && lifetimeScope == LifetimeScope::Argument;
|
|
}
|
|
|
|
bool isSubFunctionLifetimeValue() const {
|
|
return valueType == ValueType::LIFETIME && lifetimeScope == LifetimeScope::SubFunction;
|
|
}
|
|
|
|
bool isNonValue() const {
|
|
return isMovedValue() || isUninitValue() || isLifetimeValue();
|
|
}
|
|
|
|
/** The value bound */
|
|
enum class Bound { Upper, Lower, Point } bound;
|
|
|
|
/** int value (or sometimes bool value?) */
|
|
long long intvalue;
|
|
|
|
/** token value - the token that has the value. this is used for pointer aliases, strings, etc. */
|
|
const Token *tokvalue;
|
|
|
|
/** float value */
|
|
double floatValue;
|
|
|
|
/** kind of moved */
|
|
enum class MoveKind {NonMovedVariable, MovedVariable, ForwardedVariable} moveKind;
|
|
|
|
/** For calculated values - variable value that calculated value depends on */
|
|
long long varvalue;
|
|
|
|
/** Condition that this value depends on */
|
|
const Token *condition;
|
|
|
|
ErrorPath errorPath;
|
|
|
|
/** For calculated values - varId that calculated value depends on */
|
|
nonneg int varId;
|
|
|
|
/** value relies on safe checking */
|
|
bool safe;
|
|
|
|
/** Conditional value */
|
|
bool conditional;
|
|
|
|
/** Is this value passed as default parameter to the function? */
|
|
bool defaultArg;
|
|
|
|
int indirect;
|
|
|
|
/** Path id */
|
|
MathLib::bigint path;
|
|
|
|
enum class LifetimeKind {Object, SubObject, Lambda, Iterator, Address} lifetimeKind;
|
|
|
|
enum class LifetimeScope { Local, Argument, SubFunction } lifetimeScope;
|
|
|
|
static const char* toString(MoveKind moveKind);
|
|
|
|
/** How known is this value */
|
|
enum class ValueKind {
|
|
/** This value is possible, other unlisted values may also be possible */
|
|
Possible,
|
|
/** Only listed values are possible */
|
|
Known,
|
|
/** Inconclusive */
|
|
Inconclusive,
|
|
/** Listed values are impossible */
|
|
Impossible
|
|
} valueKind;
|
|
|
|
void setKnown() {
|
|
valueKind = ValueKind::Known;
|
|
}
|
|
|
|
bool isKnown() const {
|
|
return valueKind == ValueKind::Known;
|
|
}
|
|
|
|
void setPossible() {
|
|
valueKind = ValueKind::Possible;
|
|
}
|
|
|
|
bool isPossible() const {
|
|
return valueKind == ValueKind::Possible;
|
|
}
|
|
|
|
bool isImpossible() const {
|
|
return valueKind == ValueKind::Impossible;
|
|
}
|
|
|
|
void setImpossible() {
|
|
valueKind = ValueKind::Impossible;
|
|
}
|
|
|
|
void setInconclusive(bool inconclusive = true) {
|
|
if (inconclusive)
|
|
valueKind = ValueKind::Inconclusive;
|
|
}
|
|
|
|
bool isInconclusive() const {
|
|
return valueKind == ValueKind::Inconclusive;
|
|
}
|
|
|
|
void changeKnownToPossible() {
|
|
if (isKnown())
|
|
valueKind = ValueKind::Possible;
|
|
}
|
|
|
|
bool errorSeverity() const {
|
|
return !condition && !defaultArg;
|
|
}
|
|
};
|
|
|
|
/// Constant folding of expression. This can be used before the full ValueFlow has been executed (ValueFlow::setValues).
|
|
const ValueFlow::Value * valueFlowConstantFoldAST(Token *expr, const Settings *settings);
|
|
|
|
/// Perform valueflow analysis.
|
|
void setValues(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger *errorLogger, const Settings *settings);
|
|
|
|
std::string eitherTheConditionIsRedundant(const Token *condition);
|
|
|
|
size_t getSizeOf(const ValueType &vt, const Settings *settings);
|
|
}
|
|
|
|
struct LifetimeToken {
|
|
const Token* token;
|
|
bool addressOf;
|
|
ValueFlow::Value::ErrorPath errorPath;
|
|
bool inconclusive;
|
|
|
|
LifetimeToken() : token(nullptr), addressOf(false), errorPath(), inconclusive(false) {}
|
|
|
|
LifetimeToken(const Token* token, ValueFlow::Value::ErrorPath errorPath)
|
|
: token(token), addressOf(false), errorPath(std::move(errorPath)), inconclusive(false)
|
|
{}
|
|
|
|
LifetimeToken(const Token* token, bool addressOf, ValueFlow::Value::ErrorPath errorPath)
|
|
: token(token), addressOf(addressOf), errorPath(std::move(errorPath)), inconclusive(false)
|
|
{}
|
|
|
|
static std::vector<LifetimeToken> setAddressOf(std::vector<LifetimeToken> v, bool b) {
|
|
for (LifetimeToken& x : v)
|
|
x.addressOf = b;
|
|
return v;
|
|
}
|
|
|
|
static std::vector<LifetimeToken> setInconclusive(std::vector<LifetimeToken> v, bool b) {
|
|
for (LifetimeToken& x : v)
|
|
x.inconclusive = b;
|
|
return v;
|
|
}
|
|
};
|
|
|
|
const Token *parseCompareInt(const Token *tok, ValueFlow::Value &true_value, ValueFlow::Value &false_value, const std::function<std::vector<MathLib::bigint>(const Token*)>& evaluate);
|
|
const Token *parseCompareInt(const Token *tok, ValueFlow::Value &true_value, ValueFlow::Value &false_value);
|
|
|
|
ValueFlow::Value inferCondition(std::string op, MathLib::bigint val, const Token* varTok);
|
|
ValueFlow::Value inferCondition(const std::string& op, const Token* varTok, MathLib::bigint val);
|
|
|
|
std::vector<LifetimeToken> getLifetimeTokens(const Token* tok,
|
|
bool escape = false,
|
|
ValueFlow::Value::ErrorPath errorPath = ValueFlow::Value::ErrorPath{},
|
|
int depth = 20);
|
|
|
|
const Variable* getLifetimeVariable(const Token* tok, ValueFlow::Value::ErrorPath& errorPath, bool* addressOf = nullptr);
|
|
|
|
const Variable* getLifetimeVariable(const Token* tok);
|
|
|
|
bool isLifetimeBorrowed(const Token *tok, const Settings *settings);
|
|
|
|
std::string lifetimeType(const Token *tok, const ValueFlow::Value *val);
|
|
|
|
std::string lifetimeMessage(const Token *tok, const ValueFlow::Value *val, ValueFlow::Value::ErrorPath &errorPath);
|
|
|
|
CPPCHECKLIB ValueFlow::Value getLifetimeObjValue(const Token *tok, bool inconclusive = false);
|
|
|
|
CPPCHECKLIB std::vector<ValueFlow::Value> getLifetimeObjValues(const Token *tok, bool inconclusive = false, bool subfunction = false);
|
|
|
|
#endif // valueflowH
|