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cppcheck/lib/programmemory.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2022 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 "programmemory.h"
#include "astutils.h"
#include "calculate.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 <algorithm>
#include <cassert>
#include <cmath>
#include <functional>
#include <list>
#include <memory>
#include <string>
#include <utility>
#include <vector>
nonneg int ExprIdToken::getExpressionId() const {
return tok ? tok->exprId() : exprid;
}
std::size_t ExprIdToken::Hash::operator()(ExprIdToken etok) const
{
return std::hash<nonneg int>()(etok.getExpressionId());
}
void ProgramMemory::setValue(const Token* expr, const ValueFlow::Value& value) {
mValues[expr] = value;
ValueFlow::Value subvalue = value;
const Token* subexpr = solveExprValue(
expr,
[&](const Token* tok) -> std::vector<MathLib::bigint> {
if (tok->hasKnownIntValue())
return {tok->values().front().intvalue};
MathLib::bigint result = 0;
if (getIntValue(tok->exprId(), &result))
return {result};
return {};
},
subvalue);
if (subexpr)
mValues[subexpr] = subvalue;
}
const ValueFlow::Value* ProgramMemory::getValue(nonneg int exprid, bool impossible) const
{
const ProgramMemory::Map::const_iterator it = mValues.find(exprid);
const bool found = it != mValues.cend() && (impossible || !it->second.isImpossible());
if (found)
return &it->second;
else
return nullptr;
}
// cppcheck-suppress unusedFunction
bool ProgramMemory::getIntValue(nonneg int exprid, MathLib::bigint* result) const
{
const ValueFlow::Value* value = getValue(exprid);
if (value && value->isIntValue()) {
*result = value->intvalue;
return true;
}
return false;
}
void ProgramMemory::setIntValue(const Token* expr, MathLib::bigint value, bool impossible)
{
ValueFlow::Value v(value);
if (impossible)
v.setImpossible();
setValue(expr, v);
}
bool ProgramMemory::getTokValue(nonneg int exprid, const Token** result) const
{
const ValueFlow::Value* value = getValue(exprid);
if (value && value->isTokValue()) {
*result = value->tokvalue;
return true;
}
return false;
}
// cppcheck-suppress unusedFunction
bool ProgramMemory::getContainerSizeValue(nonneg int exprid, MathLib::bigint* result) const
{
const ValueFlow::Value* value = getValue(exprid);
if (value && value->isContainerSizeValue()) {
*result = value->intvalue;
return true;
}
return false;
}
bool ProgramMemory::getContainerEmptyValue(nonneg int exprid, MathLib::bigint* result) const
{
const ValueFlow::Value* value = getValue(exprid, true);
if (value && value->isContainerSizeValue()) {
if (value->isImpossible() && value->intvalue == 0) {
*result = false;
return true;
}
if (!value->isImpossible()) {
*result = (value->intvalue == 0);
return true;
}
}
return false;
}
void ProgramMemory::setContainerSizeValue(const Token* expr, MathLib::bigint value, bool isEqual)
{
ValueFlow::Value v(value);
v.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
if (!isEqual)
v.valueKind = ValueFlow::Value::ValueKind::Impossible;
setValue(expr, v);
}
void ProgramMemory::setUnknown(const Token* expr) {
mValues[expr].valueType = ValueFlow::Value::ValueType::UNINIT;
}
bool ProgramMemory::hasValue(nonneg int exprid)
{
return mValues.find(exprid) != mValues.end();
}
const ValueFlow::Value& ProgramMemory::at(nonneg int exprid) const {
return mValues.at(exprid);
}
ValueFlow::Value& ProgramMemory::at(nonneg int exprid) {
return mValues.at(exprid);
}
void ProgramMemory::erase_if(const std::function<bool(const ExprIdToken&)>& pred)
{
for (auto it = mValues.begin(); it != mValues.end();) {
if (pred(it->first))
it = mValues.erase(it);
else
++it;
}
}
void ProgramMemory::swap(ProgramMemory &pm)
{
mValues.swap(pm.mValues);
}
void ProgramMemory::clear()
{
mValues.clear();
}
bool ProgramMemory::empty() const
{
return mValues.empty();
}
void ProgramMemory::replace(const ProgramMemory &pm)
{
for (auto&& p : pm.mValues) {
mValues[p.first] = p.second;
}
}
void ProgramMemory::insert(const ProgramMemory &pm)
{
for (auto&& p : pm)
mValues.insert(p);
}
static ValueFlow::Value execute(const Token* expr, ProgramMemory& pm, const Settings* settings = nullptr);
static bool evaluateCondition(const std::string& op,
MathLib::bigint r,
const Token* condition,
ProgramMemory& pm,
const Settings* settings)
{
if (!condition)
return false;
if (condition->str() == op) {
return evaluateCondition(op, r, condition->astOperand1(), pm, settings) ||
evaluateCondition(op, r, condition->astOperand2(), pm, settings);
}
MathLib::bigint result = 0;
bool error = false;
execute(condition, &pm, &result, &error, settings);
return !error && result == r;
}
bool conditionIsFalse(const Token* condition, ProgramMemory pm, const Settings* settings)
{
return evaluateCondition("&&", 0, condition, pm, settings);
}
bool conditionIsTrue(const Token* condition, ProgramMemory pm, const Settings* settings)
{
return evaluateCondition("||", 1, condition, pm, settings);
}
static bool frontIs(const std::vector<MathLib::bigint>& v, bool i)
{
if (v.empty())
return false;
if (v.front())
return i;
return !i;
}
// If the scope is a non-range for loop
static bool isBasicForLoop(const Token* tok)
{
if (!tok)
return false;
if (Token::simpleMatch(tok, "}"))
return isBasicForLoop(tok->link());
if (!Token::simpleMatch(tok->previous(), ") {"))
return false;
const Token* start = tok->linkAt(-1);
if (!start)
return false;
if (!Token::simpleMatch(start->previous(), "for ("))
return false;
if (!Token::simpleMatch(start->astOperand2(), ";"))
return false;
return true;
}
void programMemoryParseCondition(ProgramMemory& pm, const Token* tok, const Token* endTok, const Settings* settings, bool then)
{
auto eval = [&](const Token* t) -> std::vector<MathLib::bigint> {
if (t->hasKnownIntValue())
return {t->values().front().intvalue};
MathLib::bigint result = 0;
bool error = false;
execute(t, &pm, &result, &error);
if (!error)
return {result};
return std::vector<MathLib::bigint>{};
};
if (Token::Match(tok, "==|>=|<=|<|>|!=")) {
ValueFlow::Value truevalue;
ValueFlow::Value falsevalue;
const Token* vartok = parseCompareInt(tok, truevalue, falsevalue, eval);
if (!vartok)
return;
if (vartok->exprId() == 0)
return;
if (!truevalue.isIntValue())
return;
if (endTok && isExpressionChanged(vartok, tok->next(), endTok, settings, true))
return;
const bool impossible = (tok->str() == "==" && !then) || (tok->str() == "!=" && then);
const ValueFlow::Value& v = then ? truevalue : falsevalue;
pm.setValue(vartok, impossible ? asImpossible(v) : v);
const Token* containerTok = settings->library.getContainerFromYield(vartok, Library::Container::Yield::SIZE);
if (containerTok)
pm.setContainerSizeValue(containerTok, v.intvalue, !impossible);
} else if (Token::simpleMatch(tok, "!")) {
programMemoryParseCondition(pm, tok->astOperand1(), endTok, settings, !then);
} else if (then && Token::simpleMatch(tok, "&&")) {
programMemoryParseCondition(pm, tok->astOperand1(), endTok, settings, then);
programMemoryParseCondition(pm, tok->astOperand2(), endTok, settings, then);
} else if (!then && Token::simpleMatch(tok, "||")) {
programMemoryParseCondition(pm, tok->astOperand1(), endTok, settings, then);
programMemoryParseCondition(pm, tok->astOperand2(), endTok, settings, then);
} else if (Token::Match(tok, "&&|%oror%")) {
std::vector<MathLib::bigint> lhs = eval(tok->astOperand1());
std::vector<MathLib::bigint> rhs = eval(tok->astOperand2());
if (lhs.empty() || rhs.empty()) {
if (frontIs(lhs, !then))
programMemoryParseCondition(pm, tok->astOperand2(), endTok, settings, then);
if (frontIs(rhs, !then))
programMemoryParseCondition(pm, tok->astOperand1(), endTok, settings, then);
}
} else if (tok->exprId() > 0) {
if (endTok && isExpressionChanged(tok, tok->next(), endTok, settings, true))
return;
pm.setIntValue(tok, 0, then);
const Token* containerTok = settings->library.getContainerFromYield(tok, Library::Container::Yield::EMPTY);
if (containerTok)
pm.setContainerSizeValue(containerTok, 0, then);
}
}
static void fillProgramMemoryFromConditions(ProgramMemory& pm, const Scope* scope, const Token* endTok, const Settings* settings)
{
if (!scope)
return;
if (!scope->isLocal())
return;
assert(scope != scope->nestedIn);
fillProgramMemoryFromConditions(pm, scope->nestedIn, endTok, settings);
if (scope->type == Scope::eIf || scope->type == Scope::eWhile || scope->type == Scope::eElse || scope->type == Scope::eFor) {
const Token* condTok = getCondTokFromEnd(scope->bodyEnd);
if (!condTok)
return;
MathLib::bigint result = 0;
bool error = false;
execute(condTok, &pm, &result, &error);
if (error)
programMemoryParseCondition(pm, condTok, endTok, settings, scope->type != Scope::eElse);
}
}
static void fillProgramMemoryFromConditions(ProgramMemory& pm, const Token* tok, const Settings* settings)
{
fillProgramMemoryFromConditions(pm, tok->scope(), tok, settings);
}
static void fillProgramMemoryFromAssignments(ProgramMemory& pm, const Token* tok, const ProgramMemory& state, const ProgramMemory::Map& vars)
{
int indentlevel = 0;
for (const Token *tok2 = tok; tok2; tok2 = tok2->previous()) {
if ((Token::simpleMatch(tok2, "=") || Token::Match(tok2->previous(), "%var% (|{")) && tok2->astOperand1() &&
tok2->astOperand2()) {
bool setvar = false;
const Token* vartok = tok2->astOperand1();
const Token* valuetok = tok2->astOperand2();
for (const auto& p:vars) {
if (p.first != vartok->exprId())
continue;
if (vartok == tok)
continue;
pm.setValue(vartok, p.second);
setvar = true;
}
if (!setvar) {
if (!pm.hasValue(vartok->exprId())) {
pm.setValue(vartok, execute(valuetok, pm));
}
}
} else if (tok2->exprId() > 0 && Token::Match(tok2, ".|(|[|*|%var%") && !pm.hasValue(tok2->exprId()) &&
isVariableChanged(tok2, 0, nullptr, true)) {
pm.setUnknown(tok2);
}
if (tok2->str() == "{") {
if (indentlevel <= 0) {
const Token* cond = getCondTokFromEnd(tok2->link());
// Keep progressing with anonymous/do scopes and always true branches
if (!Token::Match(tok2->previous(), "do|; {") && !conditionIsTrue(cond, state) &&
(cond || !isBasicForLoop(tok2)))
break;
} else
--indentlevel;
if (Token::simpleMatch(tok2->previous(), "else {"))
tok2 = tok2->linkAt(-2)->previous();
}
if (tok2->str() == "}") {
const Token *cond = getCondTokFromEnd(tok2);
const bool inElse = Token::simpleMatch(tok2->link()->previous(), "else {");
if (cond) {
if (conditionIsFalse(cond, state)) {
if (inElse) {
++indentlevel;
continue;
}
} else if (conditionIsTrue(cond, state)) {
if (inElse)
tok2 = tok2->link()->tokAt(-2);
++indentlevel;
continue;
}
}
break;
}
}
}
static void removeModifiedVars(ProgramMemory& pm, const Token* tok, const Token* origin)
{
pm.erase_if([&](const ExprIdToken& e) {
return isVariableChanged(origin, tok, e.getExpressionId(), false, nullptr, true);
});
}
static ProgramMemory getInitialProgramState(const Token* tok,
const Token* origin,
const ProgramMemory::Map& vars = ProgramMemory::Map {})
{
ProgramMemory pm;
if (origin) {
fillProgramMemoryFromConditions(pm, origin, nullptr);
const ProgramMemory state = pm;
fillProgramMemoryFromAssignments(pm, tok, state, vars);
removeModifiedVars(pm, tok, origin);
}
return pm;
}
ProgramMemoryState::ProgramMemoryState(const Settings* s) : state(), origins(), settings(s) {}
void ProgramMemoryState::insert(const ProgramMemory &pm, const Token* origin)
{
if (origin)
for (auto&& p : pm)
origins.insert(std::make_pair(p.first.getExpressionId(), origin));
state.insert(pm);
}
void ProgramMemoryState::replace(const ProgramMemory &pm, const Token* origin)
{
if (origin)
for (auto&& p : pm)
origins[p.first.getExpressionId()] = origin;
state.replace(pm);
}
static void addVars(ProgramMemory& pm, const ProgramMemory::Map& vars)
{
for (const auto& p:vars) {
const ValueFlow::Value &value = p.second;
pm.setValue(p.first.tok, value);
}
}
void ProgramMemoryState::addState(const Token* tok, const ProgramMemory::Map& vars)
{
ProgramMemory pm = state;
addVars(pm, vars);
fillProgramMemoryFromConditions(pm, tok, settings);
ProgramMemory local = pm;
fillProgramMemoryFromAssignments(pm, tok, local, vars);
addVars(pm, vars);
replace(pm, tok);
}
void ProgramMemoryState::assume(const Token* tok, bool b, bool isEmpty)
{
ProgramMemory pm = state;
if (isEmpty)
pm.setContainerSizeValue(tok, 0, b);
else
programMemoryParseCondition(pm, tok, nullptr, settings, b);
const Token* origin = tok;
const Token* top = tok->astTop();
if (top && Token::Match(top->previous(), "for|while|if (") && !Token::simpleMatch(tok->astParent(), "?")) {
origin = top->link()->next();
if (!b && origin->link()) {
origin = origin->link();
}
}
replace(pm, origin);
}
void ProgramMemoryState::removeModifiedVars(const Token* tok)
{
state.erase_if([&](const ExprIdToken& e) {
const Token* start = origins[e.getExpressionId()];
const Token* expr = e.tok;
if (!expr || isExpressionChanged(expr, start, tok, settings, true)) {
origins.erase(e.getExpressionId());
return true;
}
return false;
});
}
ProgramMemory ProgramMemoryState::get(const Token* tok, const Token* ctx, const ProgramMemory::Map& vars) const
{
ProgramMemoryState local = *this;
if (ctx)
local.addState(ctx, vars);
const Token* start = previousBeforeAstLeftmostLeaf(tok);
if (!start)
start = tok;
if (!ctx || precedes(start, ctx)) {
local.removeModifiedVars(start);
local.addState(start, vars);
} else {
local.removeModifiedVars(ctx);
}
return local.state;
}
ProgramMemory getProgramMemory(const Token *tok, const ProgramMemory::Map& vars)
{
ProgramMemory programMemory;
for (const auto& p:vars) {
const ValueFlow::Value &value = p.second;
programMemory.replace(getInitialProgramState(tok, value.tokvalue));
programMemory.replace(getInitialProgramState(tok, value.condition));
}
fillProgramMemoryFromConditions(programMemory, tok, nullptr);
ProgramMemory state;
for (const auto& p:vars) {
const ValueFlow::Value &value = p.second;
programMemory.setValue(p.first.tok, value);
}
state = programMemory;
fillProgramMemoryFromAssignments(programMemory, tok, state, vars);
return programMemory;
}
ProgramMemory getProgramMemory(const Token* tok, const Token* expr, const ValueFlow::Value& value, const Settings* settings)
{
ProgramMemory programMemory;
programMemory.replace(getInitialProgramState(tok, value.tokvalue));
programMemory.replace(getInitialProgramState(tok, value.condition));
fillProgramMemoryFromConditions(programMemory, tok, settings);
programMemory.setValue(expr, value);
const ProgramMemory state = programMemory;
fillProgramMemoryFromAssignments(programMemory, tok, state, {{expr, value}});
return programMemory;
}
static bool isNumericValue(const ValueFlow::Value& value) {
return value.isIntValue() || value.isFloatValue();
}
static double asFloat(const ValueFlow::Value& value)
{
return value.isFloatValue() ? value.floatValue : value.intvalue;
}
static std::string removeAssign(const std::string& assign) {
return std::string{assign.cbegin(), assign.cend() - 1};
}
struct assign {
template<class T, class U>
void operator()(T& x, const U& y) const
{
x = y;
}
};
static bool isIntegralValue(const ValueFlow::Value& value)
{
return value.isIntValue() || value.isIteratorValue() || value.isSymbolicValue();
}
static ValueFlow::Value evaluate(const std::string& op, const ValueFlow::Value& lhs, const ValueFlow::Value& rhs)
{
ValueFlow::Value result;
if (lhs.isImpossible() && rhs.isImpossible())
return ValueFlow::Value::unknown();
if (lhs.isImpossible() || rhs.isImpossible()) {
// noninvertible
if (contains({"%", "/", "&", "|"}, op))
return ValueFlow::Value::unknown();
result.setImpossible();
}
if (isNumericValue(lhs) && isNumericValue(rhs)) {
if (lhs.isFloatValue() || rhs.isFloatValue()) {
result.valueType = ValueFlow::Value::ValueType::FLOAT;
bool error = false;
result.floatValue = calculate(op, asFloat(lhs), asFloat(rhs), &error);
if (error)
return ValueFlow::Value::unknown();
return result;
}
}
// Must be integral types
if (!isIntegralValue(lhs) && !isIntegralValue(rhs))
return ValueFlow::Value::unknown();
// If not the same type then one must be int
if (lhs.valueType != rhs.valueType && !lhs.isIntValue() && !rhs.isIntValue())
return ValueFlow::Value::unknown();
const bool compareOp = contains({"==", "!=", "<", ">", ">=", "<="}, op);
// Comparison must be the same type
if (compareOp && lhs.valueType != rhs.valueType)
return ValueFlow::Value::unknown();
// Only add, subtract, and compare for non-integers
if (!compareOp && !contains({"+", "-"}, op) && !lhs.isIntValue() && !rhs.isIntValue())
return ValueFlow::Value::unknown();
// Both can't be iterators for non-compare
if (!compareOp && lhs.isIteratorValue() && rhs.isIteratorValue())
return ValueFlow::Value::unknown();
// Symbolic values must be in the same ring
if (lhs.isSymbolicValue() && rhs.isSymbolicValue() && lhs.tokvalue != rhs.tokvalue)
return ValueFlow::Value::unknown();
if (!lhs.isIntValue() && !compareOp) {
result.valueType = lhs.valueType;
result.tokvalue = lhs.tokvalue;
} else if (!rhs.isIntValue() && !compareOp) {
result.valueType = rhs.valueType;
result.tokvalue = rhs.tokvalue;
} else {
result.valueType = ValueFlow::Value::ValueType::INT;
}
bool error = false;
result.intvalue = calculate(op, lhs.intvalue, rhs.intvalue, &error);
if (error)
return ValueFlow::Value::unknown();
if (result.isImpossible()) {
if ((result.intvalue == 0 && op == "!=") || (result.intvalue != 0 && op == "==")) {
result.setPossible();
result.intvalue = !result.intvalue;
}
}
return result;
}
using BuiltinLibraryFunction = std::function<ValueFlow::Value(const std::vector<ValueFlow::Value>&)>;
static std::unordered_map<std::string, BuiltinLibraryFunction> createBuiltinLibraryFunctions()
{
std::unordered_map<std::string, BuiltinLibraryFunction> functions;
functions["strlen"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!(v.isTokValue() && v.tokvalue->tokType() == Token::eString))
return ValueFlow::Value::unknown();
v.valueType = ValueFlow::Value::ValueType::INT;
v.intvalue = Token::getStrLength(v.tokvalue);
v.tokvalue = nullptr;
return v;
};
functions["sin"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::sin(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["lgamma"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::lgamma(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["cos"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::cos(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["tan"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::tan(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["asin"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::asin(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["acos"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::acos(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["atan"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::atan(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["atan2"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::atan2(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["remainder"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::remainder(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["nextafter"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::nextafter(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["nexttoward"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::nexttoward(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["hypot"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::hypot(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["fdim"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::fdim(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["fmax"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::fmax(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["fmin"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::fmin(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["fmod"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::fmod(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["pow"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::pow(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["scalbln"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::scalbln(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["ldexp"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 2 || !std::all_of(args.cbegin(), args.cend(), [](const ValueFlow::Value& v) {
return v.isFloatValue() || v.isIntValue();
}))
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
ValueFlow::Value v;
combineValueProperties(args[0], args[1], &v);
v.floatValue = std::ldexp(value, args[1].isFloatValue() ? args[1].floatValue : args[1].intvalue);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["ilogb"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.intvalue = std::ilogb(value);
v.valueType = ValueFlow::Value::ValueType::INT;
return v;
};
functions["erf"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::erf(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["erfc"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::erfc(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["floor"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::floor(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["sqrt"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::sqrt(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["cbrt"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::cbrt(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["ceil"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::ceil(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["exp"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::exp(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["exp2"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::exp2(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["expm1"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::expm1(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["fabs"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::fabs(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["log"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::log(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["log10"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::log10(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["log1p"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::log1p(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["log2"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::log2(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["logb"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::logb(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["nearbyint"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::nearbyint(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["sinh"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::sinh(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["cosh"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::cosh(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["tanh"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::tanh(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["asinh"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::asinh(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["acosh"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::acosh(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["atanh"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::atanh(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["round"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::round(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["tgamma"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::tgamma(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
functions["trunc"] = [](const std::vector<ValueFlow::Value>& args) {
if (args.size() != 1)
return ValueFlow::Value::unknown();
ValueFlow::Value v = args[0];
if (!v.isFloatValue() && !v.isIntValue())
return ValueFlow::Value::unknown();
const double value = args[0].isFloatValue() ? args[0].floatValue : args[0].intvalue;
v.floatValue = std::trunc(value);
v.valueType = ValueFlow::Value::ValueType::FLOAT;
return v;
};
return functions;
}
static BuiltinLibraryFunction getBuiltinLibraryFunction(const std::string& name)
{
static const std::unordered_map<std::string, BuiltinLibraryFunction> functions = createBuiltinLibraryFunctions();
auto it = functions.find(name);
if (it == functions.end())
return nullptr;
return it->second;
}
static ValueFlow::Value executeImpl(const Token* expr, ProgramMemory& pm, const Settings* settings)
{
ValueFlow::Value unknown = ValueFlow::Value::unknown();
const ValueFlow::Value* value = nullptr;
if (!expr)
return unknown;
else if (expr->hasKnownIntValue() && !expr->isAssignmentOp() && expr->str() != ",") {
return expr->values().front();
} else if ((value = expr->getKnownValue(ValueFlow::Value::ValueType::FLOAT)) ||
(value = expr->getKnownValue(ValueFlow::Value::ValueType::ITERATOR_START)) ||
(value = expr->getKnownValue(ValueFlow::Value::ValueType::ITERATOR_END)) ||
(value = expr->getKnownValue(ValueFlow::Value::ValueType::CONTAINER_SIZE))) {
return *value;
} else if (expr->isNumber()) {
if (MathLib::isFloat(expr->str()))
return unknown;
return ValueFlow::Value{MathLib::toLongNumber(expr->str())};
} else if (expr->isBoolean()) {
return ValueFlow::Value{ expr->str() == "true" };
} else if (Token::Match(expr->tokAt(-2), ". %name% (") && astIsContainer(expr->tokAt(-2)->astOperand1())) {
const Token* containerTok = expr->tokAt(-2)->astOperand1();
const Library::Container::Yield yield = containerTok->valueType()->container->getYield(expr->strAt(-1));
if (yield == Library::Container::Yield::SIZE) {
ValueFlow::Value v = execute(containerTok, pm);
if (!v.isContainerSizeValue())
return unknown;
v.valueType = ValueFlow::Value::ValueType::INT;
return v;
} else if (yield == Library::Container::Yield::EMPTY) {
ValueFlow::Value v = execute(containerTok, pm);
if (!v.isContainerSizeValue())
return unknown;
if (v.isImpossible() && v.intvalue == 0)
return ValueFlow::Value{0};
else if (!v.isImpossible())
return ValueFlow::Value{v.intvalue == 0};
}
} else if (expr->isAssignmentOp() && expr->astOperand1() && expr->astOperand2() && expr->astOperand1()->exprId() > 0) {
ValueFlow::Value rhs = execute(expr->astOperand2(), pm);
if (rhs.isUninitValue())
return unknown;
if (expr->str() != "=") {
if (!pm.hasValue(expr->astOperand1()->exprId()))
return unknown;
ValueFlow::Value& lhs = pm.at(expr->astOperand1()->exprId());
rhs = evaluate(removeAssign(expr->str()), lhs, rhs);
if (lhs.isIntValue())
ValueFlow::Value::visitValue(rhs, std::bind(assign{}, std::ref(lhs.intvalue), std::placeholders::_1));
else if (lhs.isFloatValue())
ValueFlow::Value::visitValue(rhs, std::bind(assign{}, std::ref(lhs.floatValue), std::placeholders::_1));
else
return unknown;
return lhs;
} else {
pm.setValue(expr->astOperand1(), rhs);
return rhs;
}
} else if (expr->str() == "&&" && expr->astOperand1() && expr->astOperand2()) {
ValueFlow::Value lhs = execute(expr->astOperand1(), pm);
if (!lhs.isIntValue())
return unknown;
if (lhs.intvalue == 0)
return lhs;
return execute(expr->astOperand2(), pm);
} else if (expr->str() == "||" && expr->astOperand1() && expr->astOperand2()) {
ValueFlow::Value lhs = execute(expr->astOperand1(), pm);
if (!lhs.isIntValue())
return unknown;
if (lhs.intvalue != 0)
return lhs;
return execute(expr->astOperand2(), pm);
} else if (expr->str() == "," && expr->astOperand1() && expr->astOperand2()) {
execute(expr->astOperand1(), pm);
return execute(expr->astOperand2(), pm);
} else if (expr->tokType() == Token::eIncDecOp && expr->astOperand1() && expr->astOperand1()->exprId() != 0) {
if (!pm.hasValue(expr->astOperand1()->exprId()))
return unknown;
ValueFlow::Value& lhs = pm.at(expr->astOperand1()->exprId());
if (!lhs.isIntValue())
return unknown;
// overflow
if (!lhs.isImpossible() && lhs.intvalue == 0 && expr->str() == "--" && astIsUnsigned(expr->astOperand1()))
return unknown;
if (expr->str() == "++")
lhs.intvalue++;
else
lhs.intvalue--;
return lhs;
} else if (expr->str() == "[" && expr->astOperand1() && expr->astOperand2()) {
const Token *tokvalue = nullptr;
if (!pm.getTokValue(expr->astOperand1()->exprId(), &tokvalue)) {
auto tokvalue_it = std::find_if(expr->astOperand1()->values().cbegin(),
expr->astOperand1()->values().cend(),
std::mem_fn(&ValueFlow::Value::isTokValue));
if (tokvalue_it == expr->astOperand1()->values().cend() || !tokvalue_it->isKnown()) {
return unknown;
}
tokvalue = tokvalue_it->tokvalue;
}
if (!tokvalue || !tokvalue->isLiteral()) {
return unknown;
}
const std::string strValue = tokvalue->strValue();
ValueFlow::Value rhs = execute(expr->astOperand2(), pm);
if (!rhs.isIntValue())
return unknown;
const MathLib::bigint index = rhs.intvalue;
if (index >= 0 && index < strValue.size())
return ValueFlow::Value{strValue[index]};
else if (index == strValue.size())
return ValueFlow::Value{};
} else if (Token::Match(expr, "%cop%") && expr->astOperand1() && expr->astOperand2()) {
ValueFlow::Value lhs = execute(expr->astOperand1(), pm);
ValueFlow::Value rhs = execute(expr->astOperand2(), pm);
if (!lhs.isUninitValue() && !rhs.isUninitValue())
return evaluate(expr->str(), lhs, rhs);
if (expr->isComparisonOp()) {
if (rhs.isIntValue()) {
std::vector<ValueFlow::Value> result =
infer(makeIntegralInferModel(), expr->str(), expr->astOperand1()->values(), {rhs});
if (result.empty() || !result.front().isKnown())
return unknown;
return result.front();
} else if (lhs.isIntValue()) {
std::vector<ValueFlow::Value> result =
infer(makeIntegralInferModel(), expr->str(), {lhs}, expr->astOperand2()->values());
if (result.empty() || !result.front().isKnown())
return unknown;
return result.front();
}
}
}
// Unary ops
else if (Token::Match(expr, "!|+|-") && expr->astOperand1() && !expr->astOperand2()) {
ValueFlow::Value lhs = execute(expr->astOperand1(), pm);
if (!lhs.isIntValue())
return unknown;
if (expr->str() == "!")
lhs.intvalue = !lhs.intvalue;
if (expr->str() == "-")
lhs.intvalue = -lhs.intvalue;
return lhs;
} else if (expr->str() == "?" && expr->astOperand1() && expr->astOperand2()) {
ValueFlow::Value cond = execute(expr->astOperand1(), pm);
if (!cond.isIntValue())
return unknown;
const Token* child = expr->astOperand2();
if (cond.intvalue == 0)
return execute(child->astOperand2(), pm);
else
return execute(child->astOperand1(), pm);
} else if (expr->str() == "(" && expr->isCast()) {
if (Token::simpleMatch(expr->previous(), ">") && expr->previous()->link())
return execute(expr->astOperand2(), pm);
else
return execute(expr->astOperand1(), pm);
}
if (expr->exprId() > 0 && pm.hasValue(expr->exprId())) {
ValueFlow::Value result = pm.at(expr->exprId());
if (result.isImpossible() && result.isIntValue() && result.intvalue == 0 && isUsedAsBool(expr)) {
result.intvalue = !result.intvalue;
result.setKnown();
}
return result;
}
if (Token::Match(expr->previous(), ">|%name% {|(")) {
const Token* ftok = expr->previous();
const Function* f = ftok->function();
// TODO: Evaluate inline functions as well
if (!f && settings && expr->str() == "(") {
std::vector<const Token*> tokArgs = getArguments(expr);
std::vector<ValueFlow::Value> args(tokArgs.size());
std::transform(tokArgs.cbegin(), tokArgs.cend(), args.begin(), [&](const Token* tok) {
return execute(tok, pm, settings);
});
BuiltinLibraryFunction lf = getBuiltinLibraryFunction(ftok->str());
if (lf) {
return lf(args);
} else {
const std::string& returnValue = settings->library.returnValue(ftok);
if (!returnValue.empty()) {
std::unordered_map<nonneg int, ValueFlow::Value> arg_map;
int argn = 0;
for (const ValueFlow::Value& result : args) {
if (!result.isUninitValue())
arg_map[argn] = result;
argn++;
}
return evaluateLibraryFunction(arg_map, returnValue, settings);
}
}
}
// Check if function modifies argument
visitAstNodes(expr->astOperand2(), [&](const Token* child) {
if (child->exprId() > 0 && pm.hasValue(child->exprId())) {
ValueFlow::Value& v = pm.at(child->exprId());
if (v.valueType == ValueFlow::Value::ValueType::CONTAINER_SIZE) {
if (isContainerSizeChanged(child, v.indirect, settings))
v = unknown;
} else if (v.valueType != ValueFlow::Value::ValueType::UNINIT) {
if (isVariableChanged(child, v.indirect, settings, true))
v = unknown;
}
}
return ChildrenToVisit::op1_and_op2;
});
}
return unknown;
}
static ValueFlow::Value execute(const Token* expr, ProgramMemory& pm, const Settings* settings)
{
ValueFlow::Value v = executeImpl(expr, pm, settings);
if (!v.isUninitValue())
return v;
if (!expr)
return v;
if (pm.hasValue(expr->exprId()))
return pm.at(expr->exprId());
return v;
}
ValueFlow::Value evaluateLibraryFunction(const std::unordered_map<nonneg int, ValueFlow::Value>& args,
const std::string& returnValue,
const Settings* settings)
{
thread_local static std::unordered_map<std::string,
std::function<ValueFlow::Value(const std::unordered_map<nonneg int, ValueFlow::Value>& arg)>>
functions = {};
if (functions.count(returnValue) == 0) {
std::unordered_map<nonneg int, const Token*> lookupVarId;
std::shared_ptr<Token> expr = createTokenFromExpression(returnValue, settings, &lookupVarId);
functions[returnValue] =
[lookupVarId, expr, settings](const std::unordered_map<nonneg int, ValueFlow::Value>& xargs) {
if (!expr)
return ValueFlow::Value::unknown();
ProgramMemory pm{};
for (const auto& p : xargs) {
auto it = lookupVarId.find(p.first);
if (it != lookupVarId.end())
pm.setValue(it->second, p.second);
}
return execute(expr.get(), pm, settings);
};
}
return functions.at(returnValue)(args);
}
void execute(const Token* expr,
ProgramMemory* const programMemory,
MathLib::bigint* result,
bool* error,
const Settings* settings)
{
ValueFlow::Value v = execute(expr, *programMemory, settings);
if (!v.isIntValue() || v.isImpossible()) {
if (error)
*error = true;
} else if (result)
*result = v.intvalue;
}
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