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3342 lines (3091 loc) · 123 KB
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2023 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/>.
*/
//---------------------------------------------------------------------------
#include "astutils.h"
#include "config.h"
#include "errortypes.h"
#include "infer.h"
#include "library.h"
#include "mathlib.h"
#include "settings.h"
#include "symboldatabase.h"
#include "token.h"
#include "utils.h"
#include "valueflow.h"
#include "valueptr.h"
#include "vfvalue.h"
#include "checkclass.h"
#include <algorithm>
#include <cassert>
#include <functional>
#include <initializer_list>
#include <iterator>
#include <list>
#include <set>
#include <type_traits>
#include <unordered_map>
#include <utility>
const Token* findExpression(const nonneg int exprid,
const Token* start,
const Token* end,
const std::function<bool(const Token*)>& pred)
{
if (exprid == 0)
return nullptr;
if (!precedes(start, end))
return nullptr;
for (const Token* tok = start; tok != end; tok = tok->next()) {
if (tok->exprId() != exprid)
continue;
if (pred(tok))
return tok;
}
return nullptr;
}
static int findArgumentPosRecursive(const Token* tok, const Token* tokToFind, bool &found, nonneg int depth=0)
{
++depth;
if (!tok || depth >= 100)
return -1;
if (tok->str() == ",") {
int res = findArgumentPosRecursive(tok->astOperand1(), tokToFind, found, depth);
if (res == -1)
return -1;
if (found)
return res;
const int argn = res;
res = findArgumentPosRecursive(tok->astOperand2(), tokToFind, found, depth);
if (res == -1)
return -1;
return argn + res;
}
if (tokToFind == tok)
found = true;
return 1;
}
static int findArgumentPos(const Token* tok, const Token* tokToFind){
bool found = false;
const int argn = findArgumentPosRecursive(tok, tokToFind, found, 0);
if (found)
return argn - 1;
return -1;
}
static int getArgumentPos(const Token* ftok, const Token* tokToFind){
const Token* tok = ftok;
if (Token::Match(tok, "%name% (|{"))
tok = ftok->next();
if (!Token::Match(tok, "(|{|["))
return -1;
const Token* startTok = tok->astOperand2();
if (!startTok && tok->next() != tok->link())
startTok = tok->astOperand1();
return findArgumentPos(startTok, tokToFind);
}
template<class T, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )>
static void astFlattenRecursive(T* tok, std::vector<T*>& result, const char* op, nonneg int depth = 0)
{
++depth;
if (!tok || depth >= 100)
return;
if (tok->str() == op) {
astFlattenRecursive(tok->astOperand1(), result, op, depth);
astFlattenRecursive(tok->astOperand2(), result, op, depth);
} else {
result.push_back(tok);
}
}
std::vector<const Token*> astFlatten(const Token* tok, const char* op)
{
std::vector<const Token*> result;
astFlattenRecursive(tok, result, op);
return result;
}
std::vector<Token*> astFlatten(Token* tok, const char* op)
{
std::vector<Token*> result;
astFlattenRecursive(tok, result, op);
return result;
}
nonneg int astCount(const Token* tok, const char* op, int depth)
{
--depth;
if (!tok || depth < 0)
return 0;
if (tok->str() == op)
return astCount(tok->astOperand1(), op, depth) + astCount(tok->astOperand2(), op, depth);
return 1;
}
bool astHasToken(const Token* root, const Token * tok)
{
if (!root)
return false;
while (tok->astParent() && tok != root)
tok = tok->astParent();
return root == tok;
}
bool astHasVar(const Token * tok, nonneg int varid)
{
if (!tok)
return false;
if (tok->varId() == varid)
return true;
return astHasVar(tok->astOperand1(), varid) || astHasVar(tok->astOperand2(), varid);
}
static bool astIsCharWithSign(const Token *tok, ValueType::Sign sign)
{
if (!tok)
return false;
const ValueType *valueType = tok->valueType();
if (!valueType)
return false;
return valueType->type == ValueType::Type::CHAR && valueType->pointer == 0U && valueType->sign == sign;
}
bool astIsSignedChar(const Token *tok)
{
return astIsCharWithSign(tok, ValueType::Sign::SIGNED);
}
bool astIsUnknownSignChar(const Token *tok)
{
return astIsCharWithSign(tok, ValueType::Sign::UNKNOWN_SIGN);
}
bool astIsGenericChar(const Token* tok)
{
return !astIsPointer(tok) && tok && tok->valueType() && (tok->valueType()->type == ValueType::Type::CHAR || tok->valueType()->type == ValueType::Type::WCHAR_T);
}
bool astIsPrimitive(const Token* tok)
{
const ValueType* vt = tok ? tok->valueType() : nullptr;
if (!vt)
return false;
return vt->isPrimitive();
}
bool astIsIntegral(const Token *tok, bool unknown)
{
const ValueType *vt = tok ? tok->valueType() : nullptr;
if (!vt)
return unknown;
return vt->isIntegral() && vt->pointer == 0U;
}
bool astIsUnsigned(const Token* tok)
{
return tok && tok->valueType() && tok->valueType()->sign == ValueType::UNSIGNED;
}
bool astIsFloat(const Token *tok, bool unknown)
{
const ValueType *vt = tok ? tok->valueType() : nullptr;
if (!vt)
return unknown;
return vt->type >= ValueType::Type::FLOAT && vt->pointer == 0U;
}
bool astIsBool(const Token *tok)
{
return tok && (tok->isBoolean() || (tok->valueType() && tok->valueType()->type == ValueType::Type::BOOL && !tok->valueType()->pointer));
}
bool astIsPointer(const Token *tok)
{
return tok && tok->valueType() && tok->valueType()->pointer;
}
bool astIsSmartPointer(const Token* tok)
{
return tok && tok->valueType() && tok->valueType()->smartPointerTypeToken;
}
bool astIsUniqueSmartPointer(const Token* tok)
{
if (!astIsSmartPointer(tok))
return false;
if (!tok->valueType()->smartPointer)
return false;
return tok->valueType()->smartPointer->unique;
}
bool astIsIterator(const Token *tok)
{
return tok && tok->valueType() && tok->valueType()->type == ValueType::Type::ITERATOR;
}
bool astIsContainer(const Token* tok) {
return getLibraryContainer(tok) != nullptr && !astIsIterator(tok);
}
bool astIsContainerView(const Token* tok)
{
const Library::Container* container = getLibraryContainer(tok);
return container && !astIsIterator(tok) && container->view;
}
bool astIsContainerOwned(const Token* tok) {
return astIsContainer(tok) && !astIsContainerView(tok);
}
static const Token* getContainerFunction(const Token* tok)
{
if (!tok || !tok->valueType() || !tok->valueType()->container)
return nullptr;
const Token* parent = tok->astParent();
if (Token::Match(parent, ". %name% (") && astIsLHS(tok)) {
return parent->next();
}
return nullptr;
}
Library::Container::Action astContainerAction(const Token* tok, const Token** ftok)
{
const Token* ftok2 = getContainerFunction(tok);
if (ftok)
*ftok = ftok2;
if (!ftok2)
return Library::Container::Action::NO_ACTION;
return tok->valueType()->container->getAction(ftok2->str());
}
Library::Container::Yield astContainerYield(const Token* tok, const Token** ftok)
{
const Token* ftok2 = getContainerFunction(tok);
if (ftok)
*ftok = ftok2;
if (!ftok2)
return Library::Container::Yield::NO_YIELD;
return tok->valueType()->container->getYield(ftok2->str());
}
Library::Container::Yield astFunctionYield(const Token* tok, const Settings* settings, const Token** ftok)
{
if (!tok)
return Library::Container::Yield::NO_YIELD;
const auto* function = settings->library.getFunction(tok);
if (!function)
return Library::Container::Yield::NO_YIELD;
if (ftok)
*ftok = tok;
return function->containerYield;
}
bool astIsRangeBasedForDecl(const Token* tok)
{
return Token::simpleMatch(tok->astParent(), ":") && Token::simpleMatch(tok->astParent()->astParent(), "(");
}
std::string astCanonicalType(const Token *expr, bool pointedToType)
{
if (!expr)
return "";
std::pair<const Token*, const Token*> decl = Token::typeDecl(expr, pointedToType);
if (decl.first && decl.second) {
std::string ret;
for (const Token *type = decl.first; Token::Match(type,"%name%|::") && type != decl.second; type = type->next()) {
if (!Token::Match(type, "const|static"))
ret += type->str();
}
return ret;
}
return "";
}
static bool match(const Token *tok, const std::string &rhs)
{
if (tok->str() == rhs)
return true;
if (!tok->varId() && tok->hasKnownIntValue() && MathLib::toString(tok->values().front().intvalue) == rhs)
return true;
return false;
}
const Token * astIsVariableComparison(const Token *tok, const std::string &comp, const std::string &rhs, const Token **vartok)
{
if (!tok)
return nullptr;
const Token *ret = nullptr;
if (tok->isComparisonOp()) {
if (tok->astOperand1() && match(tok->astOperand1(), rhs)) {
// Invert comparator
std::string s = tok->str();
if (s[0] == '>')
s[0] = '<';
else if (s[0] == '<')
s[0] = '>';
if (s == comp) {
ret = tok->astOperand2();
}
} else if (tok->str() == comp && tok->astOperand2() && match(tok->astOperand2(), rhs)) {
ret = tok->astOperand1();
}
} else if (comp == "!=" && rhs == "0") {
if (tok->str() == "!") {
ret = tok->astOperand1();
// handle (!(x==0)) as (x!=0)
astIsVariableComparison(ret, "==", "0", &ret);
} else
ret = tok;
} else if (comp == "==" && rhs == "0") {
if (tok->str() == "!") {
ret = tok->astOperand1();
// handle (!(x!=0)) as (x==0)
astIsVariableComparison(ret, "!=", "0", &ret);
}
}
while (ret && ret->str() == ".")
ret = ret->astOperand2();
if (ret && ret->str() == "=" && ret->astOperand1() && ret->astOperand1()->varId())
ret = ret->astOperand1();
else if (ret && ret->varId() == 0U)
ret = nullptr;
if (vartok)
*vartok = ret;
return ret;
}
bool isVariableDecl(const Token* tok)
{
if (!tok)
return false;
const Variable* var = tok->variable();
if (!var)
return false;
if (var->nameToken() == tok)
return true;
const Token * const varDeclEndToken = var->declEndToken();
return Token::Match(varDeclEndToken, "; %var%") && varDeclEndToken->next() == tok;
}
bool isStlStringType(const Token* tok)
{
return Token::Match(tok, "std :: string|wstring|u16string|u32string !!::") ||
(Token::simpleMatch(tok, "std :: basic_string <") && !Token::simpleMatch(tok->linkAt(3), "> ::"));
}
bool isTemporary(bool cpp, const Token* tok, const Library* library, bool unknown)
{
if (!tok)
return false;
if (Token::simpleMatch(tok, "."))
return (tok->originalName() != "->" && isTemporary(cpp, tok->astOperand1(), library)) ||
isTemporary(cpp, tok->astOperand2(), library);
if (Token::Match(tok, ",|::"))
return isTemporary(cpp, tok->astOperand2(), library);
if (tok->isCast() || (cpp && isCPPCast(tok)))
return isTemporary(cpp, tok->astOperand2(), library);
if (Token::Match(tok, ".|[|++|--|%name%|%assign%"))
return false;
if (tok->isUnaryOp("*"))
return false;
if (Token::Match(tok, "&|<<|>>") && isLikelyStream(cpp, tok->astOperand1()))
return false;
if (Token::simpleMatch(tok, "?")) {
const Token* branchTok = tok->astOperand2();
if (!branchTok->astOperand1() || !branchTok->astOperand1()->valueType())
return false;
if (!branchTok->astOperand2()->valueType())
return false;
return !branchTok->astOperand1()->valueType()->isTypeEqual(branchTok->astOperand2()->valueType());
}
if (Token::simpleMatch(tok, "(") && tok->astOperand1() &&
(tok->astOperand2() || Token::simpleMatch(tok->next(), ")"))) {
if (Token::simpleMatch(tok->astOperand1(), "typeid"))
return false;
if (tok->valueType()) {
return tok->valueType()->reference == Reference::None;
}
const Token* ftok = nullptr;
if (Token::simpleMatch(tok->previous(), ">") && tok->previous()->link())
ftok = tok->previous()->link()->previous();
else
ftok = tok->previous();
if (!ftok)
return false;
if (const Function * f = ftok->function())
return !Function::returnsReference(f, true);
if (ftok->type())
return true;
if (library) {
std::string returnType = library->returnValueType(ftok);
return !returnType.empty() && returnType.back() != '&';
}
return unknown;
}
if (tok->isCast())
return false;
// Currying a function is unknown in cppcheck
if (Token::simpleMatch(tok, "(") && Token::simpleMatch(tok->astOperand1(), "("))
return unknown;
if (Token::simpleMatch(tok, "{") && Token::simpleMatch(tok->astParent(), "return") && tok->astOperand1() &&
!tok->astOperand2())
return isTemporary(cpp, tok->astOperand1(), library);
return true;
}
static bool isFunctionCall(const Token* tok)
{
if (Token::Match(tok, "%name% ("))
return true;
if (Token::Match(tok, "%name% <") && Token::simpleMatch(tok->next()->link(), "> ("))
return true;
if (Token::Match(tok, "%name% ::"))
return isFunctionCall(tok->tokAt(2));
return false;
}
static bool hasToken(const Token * startTok, const Token * stopTok, const Token * tok)
{
for (const Token * tok2 = startTok; tok2 != stopTok; tok2 = tok2->next()) {
if (tok2 == tok)
return true;
}
return false;
}
template<class T, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )>
static T* previousBeforeAstLeftmostLeafGeneric(T* tok)
{
if (!tok)
return nullptr;
T* leftmostLeaf = tok;
while (leftmostLeaf->astOperand1())
leftmostLeaf = leftmostLeaf->astOperand1();
return leftmostLeaf->previous();
}
const Token* previousBeforeAstLeftmostLeaf(const Token* tok)
{
return previousBeforeAstLeftmostLeafGeneric(tok);
}
Token* previousBeforeAstLeftmostLeaf(Token* tok)
{
return previousBeforeAstLeftmostLeafGeneric(tok);
}
template<class T, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )>
static T* nextAfterAstRightmostLeafGeneric(T* tok)
{
T * rightmostLeaf = tok;
if (!rightmostLeaf || !rightmostLeaf->astOperand1())
return nullptr;
do {
if (T* lam = findLambdaEndToken(rightmostLeaf)) {
rightmostLeaf = lam;
break;
}
if (rightmostLeaf->astOperand2() && precedes(rightmostLeaf, rightmostLeaf->astOperand2()))
rightmostLeaf = rightmostLeaf->astOperand2();
else if (rightmostLeaf->astOperand1() && precedes(rightmostLeaf, rightmostLeaf->astOperand1()))
rightmostLeaf = rightmostLeaf->astOperand1();
else
break;
} while (rightmostLeaf->astOperand1() || rightmostLeaf->astOperand2());
while (Token::Match(rightmostLeaf->next(), "]|)") && !hasToken(rightmostLeaf->next()->link(), rightmostLeaf->next(), tok))
rightmostLeaf = rightmostLeaf->next();
if (Token::Match(rightmostLeaf, "{|(|[") && rightmostLeaf->link())
rightmostLeaf = rightmostLeaf->link();
return rightmostLeaf->next();
}
const Token* nextAfterAstRightmostLeaf(const Token* tok)
{
return nextAfterAstRightmostLeafGeneric(tok);
}
Token* nextAfterAstRightmostLeaf(Token* tok)
{
return nextAfterAstRightmostLeafGeneric(tok);
}
const Token* astParentSkipParens(const Token* tok)
{
return astParentSkipParens(const_cast<Token*>(tok));
}
Token* astParentSkipParens(Token* tok)
{
if (!tok)
return nullptr;
Token * parent = tok->astParent();
if (!Token::simpleMatch(parent, "("))
return parent;
if (parent->link() != nextAfterAstRightmostLeaf(tok))
return parent;
if (Token::Match(parent->previous(), "%name% (") ||
(Token::simpleMatch(parent->previous(), "> (") && parent->previous()->link()))
return parent;
return astParentSkipParens(parent);
}
const Token* getParentMember(const Token * tok)
{
if (!tok)
return tok;
const Token * parent = tok->astParent();
if (!Token::simpleMatch(parent, "."))
return tok;
if (astIsRHS(tok)) {
if (Token::simpleMatch(parent->astOperand1(), "."))
return parent->astOperand1()->astOperand2();
return parent->astOperand1();
}
const Token * gparent = parent->astParent();
if (!Token::simpleMatch(gparent, ".") || gparent->astOperand2() != parent)
return tok;
if (gparent->astOperand1())
return gparent->astOperand1();
return tok;
}
const Token* getParentLifetime(const Token* tok)
{
if (!tok)
return tok;
// Skipping checking for variable if its a pointer-to-member
if (!Token::simpleMatch(tok->previous(), ". *")) {
const Variable* var = tok->variable();
// TODO: Call getLifetimeVariable for deeper analysis
if (!var)
return tok;
if (var->isLocal() || var->isArgument())
return tok;
}
const Token* parent = getParentMember(tok);
if (parent != tok)
return getParentLifetime(parent);
return tok;
}
static std::vector<const Token*> getParentMembers(const Token* tok)
{
if (!tok)
return {};
if (!Token::simpleMatch(tok->astParent(), "."))
return {tok};
const Token* parent = tok->astParent();
while (Token::simpleMatch(parent->astParent(), "."))
parent = parent->astParent();
std::vector<const Token*> result;
for (const Token* tok2 : astFlatten(parent, ".")) {
if (Token::simpleMatch(tok2, "(") && Token::simpleMatch(tok2->astOperand1(), ".")) {
std::vector<const Token*> sub = getParentMembers(tok2->astOperand1());
result.insert(result.end(), sub.cbegin(), sub.cend());
}
result.push_back(tok2);
}
return result;
}
const Token* getParentLifetime(bool cpp, const Token* tok, const Library* library)
{
std::vector<const Token*> members = getParentMembers(tok);
if (members.size() < 2)
return tok;
// Find the first local variable or temporary
auto it = std::find_if(members.crbegin(), members.crend(), [&](const Token* tok2) {
const Variable* var = tok2->variable();
if (var)
return var->isLocal() || var->isArgument();
return isTemporary(cpp, tok2, library);
});
if (it == members.rend())
return tok;
// If any of the submembers are borrowed types then stop
if (std::any_of(it.base() - 1, members.cend() - 1, [&](const Token* tok2) {
if (astIsPointer(tok2) || astIsContainerView(tok2) || astIsIterator(tok2))
return true;
if (!astIsUniqueSmartPointer(tok2)) {
if (astIsSmartPointer(tok2))
return true;
const Token* dotTok = tok2->next();
if (!Token::simpleMatch(dotTok, ".")) {
const Token* endTok = nextAfterAstRightmostLeaf(tok2);
if (!endTok)
dotTok = tok2->next();
else if (Token::simpleMatch(endTok, "."))
dotTok = endTok;
else if (Token::simpleMatch(endTok->next(), "."))
dotTok = endTok->next();
}
// If we are dereferencing the member variable then treat it as borrowed
if (Token::simpleMatch(dotTok, ".") && dotTok->originalName() == "->")
return true;
}
const Variable* var = tok2->variable();
return var && var->isReference();
}))
return nullptr;
return *it;
}
static bool isInConstructorList(const Token* tok)
{
if (!tok)
return false;
if (!astIsRHS(tok))
return false;
const Token* parent = tok->astParent();
if (!Token::Match(parent, "{|("))
return false;
if (!Token::Match(parent->previous(), "%var% {|("))
return false;
if (!parent->astOperand1() || !parent->astOperand2())
return false;
do {
parent = parent->astParent();
} while (Token::simpleMatch(parent, ","));
return Token::simpleMatch(parent, ":") && !Token::simpleMatch(parent->astParent(), "?");
}
std::vector<ValueType> getParentValueTypes(const Token* tok, const Settings* settings, const Token** parent)
{
if (!tok)
return {};
if (!tok->astParent())
return {};
if (isInConstructorList(tok)) {
if (parent)
*parent = tok->astParent()->astOperand1();
if (tok->astParent()->astOperand1()->valueType())
return {*tok->astParent()->astOperand1()->valueType()};
return {};
}
if (Token::Match(tok->astParent(), "(|{|,")) {
int argn = -1;
const Token* ftok = getTokenArgumentFunction(tok, argn);
const Token* typeTok = nullptr;
if (ftok && argn >= 0) {
if (ftok->function()) {
std::vector<ValueType> result;
const Token* nameTok = nullptr;
for (const Variable* var : getArgumentVars(ftok, argn)) {
if (!var)
continue;
if (!var->valueType())
continue;
nameTok = var->nameToken();
result.push_back(*var->valueType());
}
if (result.size() == 1 && nameTok && parent) {
*parent = nameTok;
}
return result;
}
if (const Type* t = Token::typeOf(ftok, &typeTok)) {
if (astIsPointer(typeTok))
return {*typeTok->valueType()};
const Scope* scope = t->classScope;
// Check for aggregate constructors
if (scope && scope->numConstructors == 0 && t->derivedFrom.empty() &&
(t->isClassType() || t->isStructType()) && numberOfArguments(ftok) < scope->varlist.size()) {
assert(argn < scope->varlist.size());
auto it = std::next(scope->varlist.cbegin(), argn);
if (it->valueType())
return {*it->valueType()};
}
}
}
}
if (settings && Token::Match(tok->astParent()->tokAt(-2), ". push_back|push_front|insert|push (") &&
astIsContainer(tok->astParent()->tokAt(-2)->astOperand1())) {
const Token* contTok = tok->astParent()->tokAt(-2)->astOperand1();
const ValueType* vtCont = contTok->valueType();
if (!vtCont->containerTypeToken)
return {};
ValueType vtParent = ValueType::parseDecl(vtCont->containerTypeToken, *settings, true); // TODO: set isCpp
return {std::move(vtParent)};
}
if (Token::Match(tok->astParent(), "return|(|{|%assign%") && parent) {
*parent = tok->astParent();
}
if (tok->astParent()->valueType())
return {*tok->astParent()->valueType()};
return {};
}
bool astIsLHS(const Token* tok)
{
if (!tok)
return false;
const Token* parent = tok->astParent();
if (!parent)
return false;
if (!parent->astOperand1())
return false;
if (!parent->astOperand2())
return false;
return parent->astOperand1() == tok;
}
bool astIsRHS(const Token* tok)
{
if (!tok)
return false;
const Token* parent = tok->astParent();
if (!parent)
return false;
if (!parent->astOperand1())
return false;
if (!parent->astOperand2())
return false;
return parent->astOperand2() == tok;
}
template<class T, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )>
static T* getCondTokImpl(T* tok)
{
if (!tok)
return nullptr;
if (Token::simpleMatch(tok, "("))
return getCondTok(tok->previous());
if (Token::simpleMatch(tok, "for") && Token::simpleMatch(tok->next()->astOperand2(), ";") &&
tok->next()->astOperand2()->astOperand2())
return tok->next()->astOperand2()->astOperand2()->astOperand1();
if (Token::simpleMatch(tok->next()->astOperand2(), ";"))
return tok->next()->astOperand2()->astOperand1();
return tok->next()->astOperand2();
}
template<class T, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )>
static T* getCondTokFromEndImpl(T* endBlock)
{
if (!Token::simpleMatch(endBlock, "}"))
return nullptr;
T* startBlock = endBlock->link();
if (!Token::simpleMatch(startBlock, "{"))
return nullptr;
if (Token::simpleMatch(startBlock->previous(), ")"))
return getCondTok(startBlock->previous()->link());
if (Token::simpleMatch(startBlock->tokAt(-2), "} else {"))
return getCondTokFromEnd(startBlock->tokAt(-2));
return nullptr;
}
template<class T, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )>
static T* getInitTokImpl(T* tok)
{
if (!tok)
return nullptr;
if (Token::Match(tok, "%name% ("))
return getInitTokImpl(tok->next());
if (tok->str() != "(")
return nullptr;
if (!Token::simpleMatch(tok->astOperand2(), ";"))
return nullptr;
if (Token::simpleMatch(tok->astOperand2()->astOperand1(), ";"))
return nullptr;
return tok->astOperand2()->astOperand1();
}
template<class T, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )>
static T* getStepTokImpl(T* tok)
{
if (!tok)
return nullptr;
if (Token::Match(tok, "%name% ("))
return getStepTokImpl(tok->next());
if (tok->str() != "(")
return nullptr;
if (!Token::simpleMatch(tok->astOperand2(), ";"))
return nullptr;
if (!Token::simpleMatch(tok->astOperand2()->astOperand2(), ";"))
return nullptr;
return tok->astOperand2()->astOperand2()->astOperand2();
}
Token* getCondTok(Token* tok)
{
return getCondTokImpl(tok);
}
const Token* getCondTok(const Token* tok)
{
return getCondTokImpl(tok);
}
Token* getCondTokFromEnd(Token* endBlock)
{
return getCondTokFromEndImpl(endBlock);
}
const Token* getCondTokFromEnd(const Token* endBlock)
{
return getCondTokFromEndImpl(endBlock);
}
Token* getInitTok(Token* tok) {
return getInitTokImpl(tok);
}
const Token* getInitTok(const Token* tok) {
return getInitTokImpl(tok);
}
Token* getStepTok(Token* tok) {
return getStepTokImpl(tok);
}
const Token* getStepTok(const Token* tok) {
return getStepTokImpl(tok);
}
const Token *findNextTokenFromBreak(const Token *breakToken)
{
const Scope *scope = breakToken->scope();
while (scope) {
if (scope->isLoopScope() || scope->type == Scope::ScopeType::eSwitch) {
if (scope->type == Scope::ScopeType::eDo && Token::simpleMatch(scope->bodyEnd, "} while ("))
return scope->bodyEnd->linkAt(2)->next();
return scope->bodyEnd;
}
scope = scope->nestedIn;
}
return nullptr;
}
bool extractForLoopValues(const Token *forToken,
nonneg int &varid,
bool &knownInitValue,
MathLib::bigint &initValue,
bool &partialCond,
MathLib::bigint &stepValue,
MathLib::bigint &lastValue)
{
if (!Token::simpleMatch(forToken, "for (") || !Token::simpleMatch(forToken->next()->astOperand2(), ";"))
return false;
const Token *initExpr = forToken->next()->astOperand2()->astOperand1();
const Token *condExpr = forToken->next()->astOperand2()->astOperand2()->astOperand1();
const Token *incExpr = forToken->next()->astOperand2()->astOperand2()->astOperand2();
if (!initExpr || !initExpr->isBinaryOp() || initExpr->str() != "=" || !Token::Match(initExpr->astOperand1(), "%var%"))
return false;
std::vector<MathLib::bigint> minInitValue = getMinValue(ValueFlow::makeIntegralInferModel(), initExpr->astOperand2()->values());
varid = initExpr->astOperand1()->varId();
knownInitValue = initExpr->astOperand2()->hasKnownIntValue();
initValue = minInitValue.empty() ? 0 : minInitValue.front();
partialCond = Token::Match(condExpr, "%oror%|&&");
visitAstNodes(condExpr, [varid, &condExpr](const Token *tok) {
if (Token::Match(tok, "%oror%|&&"))
return ChildrenToVisit::op1_and_op2;
if (Token::Match(tok, "<|<=") && tok->isBinaryOp() && tok->astOperand1()->varId() == varid && tok->astOperand2()->hasKnownIntValue()) {
if (Token::Match(condExpr, "%oror%|&&") || tok->astOperand2()->getKnownIntValue() < condExpr->astOperand2()->getKnownIntValue())
condExpr = tok;
}
return ChildrenToVisit::none;
});
if (!Token::Match(condExpr, "<|<=") || !condExpr->isBinaryOp() || condExpr->astOperand1()->varId() != varid || !condExpr->astOperand2()->hasKnownIntValue())
return false;
if (!incExpr || !incExpr->isUnaryOp("++") || incExpr->astOperand1()->varId() != varid)
return false;
stepValue = 1;
if (condExpr->str() == "<")
lastValue = condExpr->astOperand2()->getKnownIntValue() - 1;
else
lastValue = condExpr->astOperand2()->getKnownIntValue();
return true;
}
static const Token * getVariableInitExpression(const Variable * var)
{
if (!var)
return nullptr;
const Token *varDeclEndToken = var->declEndToken();
if (!varDeclEndToken)
return nullptr;
if (Token::Match(varDeclEndToken, "; %varid% =", var->declarationId()))
return varDeclEndToken->tokAt(2)->astOperand2();
return varDeclEndToken->astOperand2();
}
const Token* isInLoopCondition(const Token* tok)
{
const Token* top = tok->astTop();
return top && Token::Match(top->previous(), "for|while (") ? top : nullptr;
}
/// If tok2 comes after tok1
bool precedes(const Token * tok1, const Token * tok2)
{
if (tok1 == tok2)
return false;
if (!tok1)
return false;
if (!tok2)
return true;
return tok1->index() < tok2->index();
}
/// If tok1 comes after tok2
bool succeeds(const Token* tok1, const Token* tok2)
{
if (tok1 == tok2)
return false;
if (!tok1)
return false;
if (!tok2)
return true;
return tok1->index() > tok2->index();
}
bool isAliasOf(const Token *tok, nonneg int varid, bool* inconclusive)
{
if (tok->varId() == varid)
return false;
for (const ValueFlow::Value &val : tok->values()) {
if (!val.isLocalLifetimeValue())
continue;
if (val.tokvalue->varId() == varid) {
if (val.isInconclusive()) {
if (inconclusive)
*inconclusive = true;
else
continue;
}
return true;
}
}
return false;
}
bool isAliasOf(const Token* tok, const Token* expr, bool* inconclusive)
{
const bool pointer = astIsPointer(tok);
const ValueFlow::Value* value = nullptr;
const Token* r = findAstNode(expr, [&](const Token* childTok) {
for (const ValueFlow::Value& val : tok->values()) {
if (val.isImpossible())
continue;
if (val.isLocalLifetimeValue() || (pointer && val.isSymbolicValue() && val.intvalue == 0)) {
if (findAstNode(val.tokvalue,
[&](const Token* aliasTok) {
return aliasTok->exprId() == childTok->exprId();
})) {
if (val.isInconclusive() && inconclusive != nullptr) {
value = &val;
} else {
return true;
}
}
}
}
return false;