/*

* 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 "library.h"

#include "mathlib.h"

#include "platform.h"

#include "settings.h"

#include "testsuite.h"

#include "token.h"

#include "tokenize.h"

#include "valueflow.h"

#include <algorithm>

#include <climits>

#include <cmath>

#include <cstdint>

#include <cstring>

#include <functional>

#include <list>

#include <map>

#include <memory>

#include <ostream>

#include <set>

#include <sstream>

#include <string>

#include <utility>

#include <vector>

#include <simplecpp.h>

class TestValueFlow : public TestFixture {

public:

TestValueFlow() : TestFixture("TestValueFlow") {}

private:

Settings settings;

void run() override {

// strcpy, abort cfg

const char cfg[] = "<?xml version=\"1.0\"?>\n"

"<def>\n"

" <function name=\"strcpy\"> <arg nr=\"1\"><not-null/></arg> </function>\n"

" <function name=\"abort\"> <noreturn>true</noreturn> </function>\n" // abort is a noreturn function

"</def>";

ASSERT_EQUALS(true, settings.library.loadxmldata(cfg, sizeof(cfg)));

LOAD_LIB_2(settings.library, "std.cfg");

TEST_CASE(valueFlowNumber);

TEST_CASE(valueFlowString);

TEST_CASE(valueFlowPointerAlias);

TEST_CASE(valueFlowLifetime);

TEST_CASE(valueFlowArrayElement);

TEST_CASE(valueFlowMove);

TEST_CASE(valueFlowBitAnd);

TEST_CASE(valueFlowRightShift);

TEST_CASE(valueFlowCalculations);

TEST_CASE(valueFlowSizeof);

TEST_CASE(valueFlowErrorPath);

TEST_CASE(valueFlowBeforeCondition);

TEST_CASE(valueFlowBeforeConditionAndAndOrOrGuard);

TEST_CASE(valueFlowBeforeConditionAssignIncDec);

TEST_CASE(valueFlowBeforeConditionFunctionCall);

TEST_CASE(valueFlowBeforeConditionGlobalVariables);

TEST_CASE(valueFlowBeforeConditionGoto);

TEST_CASE(valueFlowBeforeConditionIfElse);

TEST_CASE(valueFlowBeforeConditionLoop);

TEST_CASE(valueFlowBeforeConditionMacro);

TEST_CASE(valueFlowBeforeConditionSizeof);

TEST_CASE(valueFlowBeforeConditionSwitch);

TEST_CASE(valueFlowBeforeConditionTernaryOp);

TEST_CASE(valueFlowBeforeConditionForward);

TEST_CASE(valueFlowBeforeConditionConstructor);

TEST_CASE(valueFlowAfterAssign);

TEST_CASE(valueFlowAfterSwap);

TEST_CASE(valueFlowAfterCondition);

TEST_CASE(valueFlowAfterConditionTernary);

TEST_CASE(valueFlowAfterConditionExpr);

TEST_CASE(valueFlowAfterConditionSeveralNot);

TEST_CASE(valueFlowForwardCompoundAssign);

TEST_CASE(valueFlowForwardCorrelatedVariables);

TEST_CASE(valueFlowForwardModifiedVariables);

TEST_CASE(valueFlowForwardFunction);

TEST_CASE(valueFlowForwardTernary);

TEST_CASE(valueFlowForwardLambda);

TEST_CASE(valueFlowForwardTryCatch);

TEST_CASE(valueFlowForwardInconclusiveImpossible);

TEST_CASE(valueFlowForwardConst);

TEST_CASE(valueFlowForwardAfterCondition);

TEST_CASE(valueFlowFwdAnalysis);

TEST_CASE(valueFlowSwitchVariable);

TEST_CASE(valueFlowForLoop);

TEST_CASE(valueFlowSubFunction);

TEST_CASE(valueFlowFunctionReturn);

TEST_CASE(valueFlowFunctionDefaultParameter);

TEST_CASE(knownValue);

TEST_CASE(valueFlowSizeofForwardDeclaredEnum);

TEST_CASE(valueFlowGlobalVar);

TEST_CASE(valueFlowGlobalConstVar);

TEST_CASE(valueFlowGlobalStaticVar);

TEST_CASE(valueFlowInlineAssembly);

TEST_CASE(valueFlowSameExpression);

TEST_CASE(valueFlowUninit);

TEST_CASE(valueFlowConditionExpressions);

TEST_CASE(valueFlowContainerSize);

TEST_CASE(valueFlowDynamicBufferSize);

TEST_CASE(valueFlowSafeFunctionParameterValues);

TEST_CASE(valueFlowUnknownFunctionReturn);

TEST_CASE(valueFlowPointerAliasDeref);

TEST_CASE(valueFlowCrashIncompleteCode);

TEST_CASE(valueFlowCrash);

TEST_CASE(valueFlowHang);

TEST_CASE(valueFlowCrashConstructorInitialization);

TEST_CASE(valueFlowUnknownMixedOperators);

TEST_CASE(valueFlowSolveExpr);

TEST_CASE(valueFlowIdempotent);

TEST_CASE(valueFlowUnsigned);

TEST_CASE(valueFlowMod);

TEST_CASE(valueFlowNotNull);

TEST_CASE(valueFlowSymbolic);

TEST_CASE(valueFlowSymbolicIdentity);

TEST_CASE(valueFlowSmartPointer);

}

static bool isNotTokValue(const ValueFlow::Value &val) {

return !val.isTokValue();

}

static bool isNotLifetimeValue(const ValueFlow::Value& val) {

return !val.isLifetimeValue();

}

static bool isNotUninitValue(const ValueFlow::Value& val) {

return !val.isUninitValue();

}

static bool isNotPossible(const ValueFlow::Value& val) {

return !val.isPossible();

}

static bool isNotKnown(const ValueFlow::Value& val) {

return !val.isKnown();

}

static bool isNotInconclusive(const ValueFlow::Value& val) {

return !val.isInconclusive();

}

static bool isNotImpossible(const ValueFlow::Value& val) {

return !val.isImpossible();

}

#define testValueOfXKnown(...) testValueOfXKnown_(__FILE__, __LINE__, __VA_ARGS__)

bool testValueOfXKnown_(const char* file, int line, const char code[], unsigned int linenr, int value) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value& val:tok->values()) {

if (val.isSymbolicValue())

continue;

if (val.isKnown() && val.intvalue == value)

return true;

}

}

}

return false;

}

bool testValueOfXKnown_(const char* file, int line, const char code[], unsigned int linenr, const std::string& expr, int value) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token* tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value& val : tok->values()) {

if (!val.isSymbolicValue())

continue;

if (val.isKnown() && val.intvalue == value && val.tokvalue->expressionString() == expr)

return true;

}

}

}

return false;

}

#define testValueOfXImpossible(...) testValueOfXImpossible_(__FILE__, __LINE__, __VA_ARGS__)

bool testValueOfXImpossible_(const char* file, int line, const char code[], unsigned int linenr, int value) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value& val:tok->values()) {

if (val.isSymbolicValue())

continue;

if (val.isImpossible() && val.intvalue == value)

return true;

}

}

}

return false;

}

bool testValueOfXImpossible_(const char* file, int line, const char code[], unsigned int linenr, const std::string& expr, int value)

{

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token* tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value& val : tok->values()) {

if (!val.isSymbolicValue())

continue;

if (val.isImpossible() && val.intvalue == value && val.tokvalue->expressionString() == expr)

return true;

}

}

}

return false;

}

#define testValueOfXInconclusive(code, linenr, value) testValueOfXInconclusive_(code, linenr, value, __FILE__, __LINE__)

bool testValueOfXInconclusive_(const char code[], unsigned int linenr, int value, const char* file, int line) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value& val:tok->values()) {

if (val.isSymbolicValue())

continue;

if (val.isInconclusive() && val.intvalue == value)

return true;

}

}

}

return false;

}

#define testValueOfX(...) testValueOfX_(__FILE__, __LINE__, __VA_ARGS__)

bool testValueOfX_(const char* file, int line, const char code[], unsigned int linenr, int value) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value &v : tok->values()) {

if (v.isIntValue() && !v.isImpossible() && v.intvalue == value)

return true;

}

}

}

return false;

}

bool testValueOfX_(const char* file, int line, const char code[], unsigned int linenr, const std::string& expr, int value)

{

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token* tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value& v : tok->values()) {

if (v.isSymbolicValue() && !v.isImpossible() && v.intvalue == value &&

v.tokvalue->expressionString() == expr)

return true;

}

}

}

return false;

}

bool testValueOfX_(const char* file, int line, const char code[], unsigned int linenr, float value, float diff) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value &v : tok->values()) {

if (v.isFloatValue() && !v.isImpossible() && v.floatValue >= value - diff &&

v.floatValue <= value + diff)

return true;

}

}

}

return false;

}

#define getErrorPathForX(code, linenr) getErrorPathForX_(code, linenr, __FILE__, __LINE__)

std::string getErrorPathForX_(const char code[], unsigned int linenr, const char* file, int line) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() != "x" || tok->linenr() != linenr)

continue;

std::ostringstream ostr;

for (const ValueFlow::Value &v : tok->values()) {

for (const ValueFlow::Value::ErrorPathItem &ep : v.errorPath) {

const Token *eptok = ep.first;

const std::string &msg = ep.second;

ostr << eptok->linenr() << ',' << msg << '\n';

}

}

return ostr.str();

}

return "";

}

bool testValueOfX_(const char* file, int line, const char code[], unsigned int linenr, const char value[], ValueFlow::Value::ValueType type) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value &v : tok->values()) {

if (v.valueType == type && Token::simpleMatch(v.tokvalue, value, strlen(value)))

return true;

}

}

}

return false;

}

#define testLifetimeOfX(...) testLifetimeOfX_(__FILE__, __LINE__, __VA_ARGS__)

bool testLifetimeOfX_(const char* file, int line, const char code[], unsigned int linenr, const char value[], ValueFlow::Value::LifetimeScope lifetimeScope = ValueFlow::Value::LifetimeScope::Local) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value &v : tok->values()) {

if (v.isLifetimeValue() && v.lifetimeScope == lifetimeScope && Token::simpleMatch(v.tokvalue, value, strlen(value)))

return true;

}

}

}

return false;

}

bool testValueOfX_(const char* file, int line, const char code[], unsigned int linenr, int value, ValueFlow::Value::ValueType type) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value &v : tok->values()) {

if (v.valueType == type && v.intvalue == value)

return true;

}

}

}

return false;

}

bool testValueOfX_(const char* file, int line, const char code[], unsigned int linenr, ValueFlow::Value::MoveKind moveKind) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value &v : tok->values()) {

if (v.isMovedValue() && v.moveKind == moveKind)

return true;

}

}

}

return false;

}

#define testConditionalValueOfX(code, linenr, value) testConditionalValueOfX_(code, linenr, value, __FILE__, __LINE__)

bool testConditionalValueOfX_(const char code[], unsigned int linenr, int value, const char* file, int line) {

// Tokenize..

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {

if (tok->str() == "x" && tok->linenr() == linenr) {

for (const ValueFlow::Value &v : tok->values()) {

if (v.isIntValue() && v.intvalue == value && v.condition)

return true;

}

}

}

return false;

}

void bailout(const char code[]) {

settings.debugwarnings = true;

errout.str("");

std::vector<std::string> files(1, "test.cpp");

std::istringstream istr(code);

const simplecpp::TokenList tokens1(istr, files, files[0]);

simplecpp::TokenList tokens2(files);

std::map<std::string, simplecpp::TokenList*> filedata;

simplecpp::preprocess(tokens2, tokens1, files, filedata, simplecpp::DUI());

// Tokenize..

Tokenizer tokenizer(&settings, this);

tokenizer.createTokens(std::move(tokens2));

tokenizer.simplifyTokens1("");

settings.debugwarnings = false;

}

#define tokenValues(...) tokenValues_(__FILE__, __LINE__, __VA_ARGS__)

std::list<ValueFlow::Value> tokenValues_(const char* file, int line, const char code[], const char tokstr[], const Settings *s = nullptr) {

Tokenizer tokenizer(s ? s : &settings, this);

std::istringstream istr(code);

errout.str("");

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

const Token *tok = Token::findmatch(tokenizer.tokens(), tokstr);

return tok ? tok->values() : std::list<ValueFlow::Value>();

}

std::list<ValueFlow::Value> tokenValues_(const char* file, int line, const char code[], const char tokstr[], ValueFlow::Value::ValueType vt, const Settings *s = nullptr) {

std::list<ValueFlow::Value> values = tokenValues_(file, line, code, tokstr, s);

values.remove_if([&](const ValueFlow::Value& v) {

return v.valueType != vt;

});

return values;

}

#define lifetimeValues(...) lifetimeValues_(__FILE__, __LINE__, __VA_ARGS__)

std::vector<std::string> lifetimeValues_(const char* file, int line, const char code[], const char tokstr[], const Settings *s = nullptr) {

std::vector<std::string> result;

Tokenizer tokenizer(s ? s : &settings, this);

std::istringstream istr(code);

errout.str("");

ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);

const Token *tok = Token::findmatch(tokenizer.tokens(), tokstr);

if (!tok)

return result;

for (const ValueFlow::Value& value:tok->values()) {

if (!value.isLifetimeValue())

continue;

if (!value.tokvalue)

continue;

result.push_back(value.tokvalue->expressionString());

}

return result;

}

#define valueOfTok(code, tokstr) valueOfTok_(code, tokstr, __FILE__, __LINE__)

ValueFlow::Value valueOfTok_(const char code[], const char tokstr[], const char* file, int line) {

std::list<ValueFlow::Value> values = removeImpossible(tokenValues_(file, line, code, tokstr));

return values.size() == 1U && !values.front().isTokValue() ? values.front() : ValueFlow::Value();

}

std::list<ValueFlow::Value> removeSymbolic(std::list<ValueFlow::Value> values)

{

values.remove_if(std::mem_fn(&ValueFlow::Value::isSymbolicValue));

return values;

}

std::list<ValueFlow::Value> removeImpossible(std::list<ValueFlow::Value> values)

{

values.remove_if(std::mem_fn(&ValueFlow::Value::isImpossible));

return values;

}

void valueFlowNumber() {

ASSERT_EQUALS(123, valueOfTok("x=123;", "123").intvalue);

ASSERT_EQUALS_DOUBLE(192.0, valueOfTok("x=0x0.3p10;", "0x0.3p10").floatValue, 1e-5); // 3 * 16^-1 * 2^10 = 192

ASSERT(std::fabs(valueOfTok("x=0.5;", "0.5").floatValue - 0.5f) < 0.1f);

ASSERT_EQUALS(10, valueOfTok("enum {A=10,B=15}; x=A+0;", "+").intvalue);

ASSERT_EQUALS(0, valueOfTok("x=false;", "false").intvalue);

ASSERT_EQUALS(1, valueOfTok("x=true;", "true").intvalue);

ASSERT_EQUALS(0, valueOfTok("x(NULL);", "NULL").intvalue);

ASSERT_EQUALS((int)('a'), valueOfTok("x='a';", "'a'").intvalue);

ASSERT_EQUALS((int)('\n'), valueOfTok("x='\\n';", "'\\n'").intvalue);

TODO_ASSERT_EQUALS(0xFFFFFFFF00000000, 0, valueOfTok("x=0xFFFFFFFF00000000;", "0xFFFFFFFF00000000").intvalue); // #7701

ASSERT_EQUALS_DOUBLE(16, valueOfTok("x=(double)16;", "(").floatValue, 1e-5);

ASSERT_EQUALS_DOUBLE(0.0625, valueOfTok("x=1/(double)16;", "/").floatValue, 1e-5);

// scope

{

const char code[] = "namespace N { enum E {e0,e1}; }\n"

"void foo() { x = N::e1; }";

ASSERT_EQUALS(1, valueOfTok(code, "::").intvalue);

}

}

void valueFlowString() {

const char *code;

// valueFlowAfterAssign

code = "const char * f() {\n"

" static const char *x;\n"

" if (a) x = \"123\";\n"

" return x;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 4, "\"123\"", ValueFlow::Value::ValueType::TOK));

// valueFlowSubFunction

code = "void dostuff(const char *x) {\n"

" f(x);\n"

"}\n"

"\n"

"void test() { dostuff(\"abc\"); }";

ASSERT_EQUALS(true, testValueOfX(code, 2, "\"abc\"", ValueFlow::Value::ValueType::TOK));

}

void valueFlowPointerAlias() {

const char *code;

std::list<ValueFlow::Value> values;

code = "const char * f() {\n"

" static const char *x;\n"

" static char ret[10];\n"

" if (a) x = &ret[0];\n"

" return x;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 5, "& ret [ 0 ]", ValueFlow::Value::ValueType::TOK));

// dead pointer

code = "void f() {\n"

" int *x;\n"

" if (cond) { int i; x = &i; }\n"

" *x = 0;\n" // <- x can point at i

"}";

ASSERT_EQUALS(true, testValueOfX(code, 4, "& i", ValueFlow::Value::ValueType::TOK));

code = "void f() {\n"

" struct X *x;\n"

" x = &x[1];\n"

"}";

values = tokenValues(code, "&");

values.remove_if(&isNotTokValue);

ASSERT_EQUALS(true, values.empty());

values = tokenValues(code, "x [");

values.remove_if(&isNotTokValue);

ASSERT_EQUALS(true, values.empty());

}

void valueFlowLifetime() {

const char *code;

std::vector<std::string> lifetimes;

LOAD_LIB_2(settings.library, "std.cfg");

code = "void f() {\n"

" int a = 1;\n"

" auto x = [&]() { return a + 1; };\n"

" auto b = x;\n"

"}\n";

ASSERT_EQUALS(true, testLifetimeOfX(code, 4, "a + 1"));

code = "void f() {\n"

" int a = 1;\n"

" auto x = [=]() { return a + 1; };\n"

" auto b = x;\n"

"}\n";

ASSERT_EQUALS(false, testLifetimeOfX(code, 4, "a ;"));

code = "void f(int v) {\n"

" int a = v;\n"

" int * p = &a;\n"

" auto x = [=]() { return p + 1; };\n"

" auto b = x;\n"

"}\n";

ASSERT_EQUALS(true, testLifetimeOfX(code, 5, "a ;"));

code = "void f() {\n"

" std::vector<int> v;\n"

" auto x = v.begin();\n"

" auto it = x;\n"

"}\n";

ASSERT_EQUALS(true, testLifetimeOfX(code, 4, "v . begin"));

code = "void f() {\n"

" std::vector<int> v;\n"

" auto x = v.begin() + 1;\n"

" auto it = x;\n"

"}\n";

ASSERT_EQUALS(true, testLifetimeOfX(code, 4, "v . begin"));

code = "int* f() {\n"

" std::vector<int> v;\n"

" int * x = v.data();\n"

" return x;\n"

"}\n";

ASSERT_EQUALS(true, testLifetimeOfX(code, 4, "v . data"));

code = "int* f() {\n"

" std::vector<int> v;\n"

" int * x = v.data() + 1;\n"

" return x;\n"

"}\n";

ASSERT_EQUALS(true, testLifetimeOfX(code, 4, "v . data"));

code = "int f(int* a) {\n"

" int **p = &a;\n"

" int * x = *p;\n"

" return x; \n"

"}\n";

ASSERT_EQUALS(false, testLifetimeOfX(code, 4, "a"));

code = "void f() {\n"

" int i = 0;\n"

" void* x = (void*)&i;\n"

"}\n";

lifetimes = lifetimeValues(code, "( void * )");

ASSERT_EQUALS(true, lifetimes.size() == 1);

ASSERT_EQUALS(true, lifetimes.front() == "i");

code = "struct T {\n" // #10810

" static int g() { return 0; }\n"

"};\n"

"T t;\n"

"struct S { int i; };\n"

"S f() {\n"

" S s = { decltype(t)::g() };\n"

" return s;\n"

"};\n";

lifetimes = lifetimeValues(code, "=");

ASSERT_EQUALS(true, lifetimes.empty());

code = "struct T {\n" // #10838

" void f();\n"

" double d[4][4];\n"

"};\n"

"void T::f() {\n"

" auto g = [this]() -> double(&)[4] {\n"

" double(&q)[4] = d[0];\n"

" return q;\n"

" };\n"

"}\n";

lifetimes = lifetimeValues(code, "return"); // don't crash

ASSERT_EQUALS(true, lifetimes.empty());

}

void valueFlowArrayElement() {

const char *code;

code = "void f() {\n"

" const int x[] = {43,23,12};\n"

" return x;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 3U, "{ 43 , 23 , 12 }", ValueFlow::Value::ValueType::TOK));

code = "void f() {\n"

" const char x[] = \"abcd\";\n"

" return x;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 3U, "\"abcd\"", ValueFlow::Value::ValueType::TOK));

code = "void f() {\n"

" char x[32] = \"abcd\";\n"

" return x;\n"

"}";

TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 3U, "\"abcd\"", ValueFlow::Value::ValueType::TOK));

code = "void f() {\n"

" int a[10];\n"

" int *x = a;\n" // <- a value is a

" *x = 0;\n" // .. => x value is a

"}";

ASSERT_EQUALS(true, testValueOfX(code, 4, "a", ValueFlow::Value::ValueType::TOK));

code = "char f() {\n"

" const char *x = \"abcd\";\n"

" return x[0];\n"

"}";

ASSERT_EQUALS((int)('a'), valueOfTok(code, "[").intvalue);

code = "char f() {\n"

" const char *x = \"\";\n"

" return x[0];\n"

"}";

ASSERT_EQUALS(0, valueOfTok(code, "[").intvalue);

code = "int g() { return 3; }\n"

"void f() {\n"

" const int x[2] = { g(), g() };\n"

" return x[0];\n"

"}\n";

ASSERT_EQUALS(3, valueOfTok(code, "[ 0").intvalue);

code = "int g() { return 3; }\n"

"void f() {\n"

" const int x[2] = { g(), g() };\n"

" return x[1];\n"

"}\n";

ASSERT_EQUALS(3, valueOfTok(code, "[ 1").intvalue);

}

void valueFlowMove() {

const char *code;

code = "void f() {\n"

" X x;\n"

" g(std::move(x));\n"

" y=x;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 4U, ValueFlow::Value::MoveKind::MovedVariable));

code = "void f() {\n"

" X x;\n"

" g(std::forward<X>(x));\n"

" y=x;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 4U, ValueFlow::Value::MoveKind::ForwardedVariable));

code = "void f() {\n"

" X x;\n"

" g(std::move(x).getA());\n" // Only parts of x might be moved out

" y=x;\n"

"}";

ASSERT_EQUALS(false, testValueOfX(code, 4U, ValueFlow::Value::MoveKind::MovedVariable));

code = "void f() {\n"

" X x;\n"

" g(std::forward<X>(x).getA());\n" // Only parts of x might be moved out

" y=x;\n"

"}";

ASSERT_EQUALS(false, testValueOfX(code, 4U, ValueFlow::Value::MoveKind::ForwardedVariable));

code = "void f() {\n"

" X x;\n"

" g(std::move(x));\n"

" x.clear();\n"

" y=x;\n"

"}";

ASSERT_EQUALS(false, testValueOfX(code, 5U, ValueFlow::Value::MoveKind::MovedVariable));

code = "void f() {\n"

" X x;\n"

" g(std::move(x));\n"

" y=x->y;\n"

" z=x->z;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 5U, ValueFlow::Value::MoveKind::MovedVariable));

code = "void f(int i) {\n"

" X x;\n"

" z = g(std::move(x));\n"

" y = x;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 4U, ValueFlow::Value::MoveKind::MovedVariable));

code = "void f(int i) {\n"

" X x;\n"

" y = g(std::move(x),\n"

" x.size());\n"

"}";

ASSERT_EQUALS(false, testValueOfX(code, 4U, ValueFlow::Value::MoveKind::MovedVariable));

code = "void f(int i) {\n"

" X x;\n"

" x = g(std::move(x));\n"

" y = x;\n"

"}";

ASSERT_EQUALS(false, testValueOfX(code, 4U, ValueFlow::Value::MoveKind::MovedVariable));

code = "A f(int i) {\n"

" X x;\n"

" if (i)"

" return g(std::move(x));\n"

" return h(std::move(x));\n"

"}";

ASSERT_EQUALS(false, testValueOfX(code, 5U, ValueFlow::Value::MoveKind::MovedVariable));

code = "struct X {\n"

"};\n"

"struct Data {\n"

" template<typename Fun>\n"

" void foo(Fun f) {}\n"

"};\n"

"Data g(X value) { return Data(); }\n"

"void f() {\n"

" X x;\n"

" g(std::move(x)).foo([=](int value) mutable {;});\n"

" X y=x;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 11U, ValueFlow::Value::MoveKind::MovedVariable));

code = "void f(int x) {\n"

" g(std::move(x));\n"

" y=x;\n"

"}";

ASSERT_EQUALS(false, testValueOfX(code, 3U, ValueFlow::Value::MoveKind::MovedVariable));

}

void valueFlowCalculations() {

const char *code;

// Different operators

ASSERT_EQUALS(5, valueOfTok("3 + (a ? b : 2);", "+").intvalue);

ASSERT_EQUALS(1, valueOfTok("3 - (a ? b : 2);", "-").intvalue);

ASSERT_EQUALS(6, valueOfTok("3 * (a ? b : 2);", "*").intvalue);

ASSERT_EQUALS(6, valueOfTok("13 / (a ? b : 2);", "/").intvalue);

ASSERT_EQUALS(1, valueOfTok("13 % (a ? b : 2);", "%").intvalue);

ASSERT_EQUALS(0, valueOfTok("3 == (a ? b : 2);", "==").intvalue);

ASSERT_EQUALS(1, valueOfTok("3 != (a ? b : 2);", "!=").intvalue);

ASSERT_EQUALS(1, valueOfTok("3 > (a ? b : 2);", ">").intvalue);

ASSERT_EQUALS(1, valueOfTok("3 >= (a ? b : 2);", ">=").intvalue);

ASSERT_EQUALS(0, valueOfTok("3 < (a ? b : 2);", "<").intvalue);

ASSERT_EQUALS(0, valueOfTok("3 <= (a ? b : 2);", "<=").intvalue);

ASSERT_EQUALS(1, valueOfTok("(UNKNOWN_TYPE)1;","(").intvalue);

ASSERT(tokenValues("(UNKNOWN_TYPE)1000;","(").empty()); // don't know if there is truncation, sign extension

ASSERT_EQUALS(255, valueOfTok("(unsigned char)~0;", "(").intvalue);

ASSERT_EQUALS(0, valueOfTok("(int)0;", "(").intvalue);

ASSERT_EQUALS(3, valueOfTok("(int)(1+2);", "(").intvalue);

ASSERT_EQUALS(0, valueOfTok("(UNKNOWN_TYPE*)0;","(").intvalue);

ASSERT_EQUALS(100, valueOfTok("(int)100.0;", "(").intvalue);

ASSERT_EQUALS(10, valueOfTok("x = static_cast<int>(10);", "( 10 )").intvalue);

ASSERT_EQUALS(0, valueOfTok("x = sizeof (struct {int a;}) * 0;", "*").intvalue);

// Don't calculate if there is UB

ASSERT(tokenValues(";-1<<10;","<<").empty());

ASSERT(tokenValues(";10<<-1;","<<").empty());

ASSERT(tokenValues(";10<<64;","<<").empty());

ASSERT(tokenValues(";-1>>10;",">>").empty());

ASSERT(tokenValues(";10>>-1;",">>").empty());

ASSERT(tokenValues(";10>>64;",">>").empty());

code = "float f(const uint16_t& value) {\n"

" const uint16_t uVal = value; \n"

" return static_cast<float>(uVal) / 2;\n"

"}\n";

ASSERT_EQUALS(true, tokenValues(code, "/").empty());

// calculation using 1,2 variables/values

code = "void f(int x) {\n"

" a = x+456;\n"

" if (x==123) {}"

"}";

ASSERT_EQUALS(579, valueOfTok(code, "+").intvalue);

code = "void f(int x, int y) {\n"

" a = x+y;\n"

" if (x==123 || y==456) {}"

"}";

ASSERT_EQUALS(0, valueOfTok(code, "+").intvalue);

code = "void f(int x) {\n"

" a = x+x;\n"

" if (x==123) {}"

"}";

ASSERT_EQUALS(246, valueOfTok(code, "+").intvalue);

code = "void f(int x, int y) {\n"

" a = x*x;\n"

" if (x==2) {}\n"

" if (x==4) {}\n"

"}";

std::list<ValueFlow::Value> values = tokenValues(code,"*");

ASSERT_EQUALS(2U, values.size());

ASSERT_EQUALS(4, values.front().intvalue);

ASSERT_EQUALS(16, values.back().intvalue);

code = "void f(int x) {\n"

" if (x == 3) {}\n"

" a = x * (1 - x - 1);\n"

"}";

ASSERT_EQUALS(-9, valueOfTok(code, "*").intvalue);

// addition of different variables with known values

code = "int f(int x) {\n"

" int a = 1;\n"

" while (x!=3) { x+=a; }\n"

" return x/a;\n"

"}\n";

ASSERT_EQUALS(3, valueOfTok(code, "/").intvalue);

// ? :

code = "x = y ? 2 : 3;\n";

values = tokenValues(code,"?");

ASSERT_EQUALS(2U, values.size());

ASSERT_EQUALS(2, values.front().intvalue);

ASSERT_EQUALS(3, values.back().intvalue);

code = "void f(int a) { x = a ? 2 : 3; }\n";

values = tokenValues(code,"?");

ASSERT_EQUALS(2U, values.size());

ASSERT_EQUALS(2, values.front().intvalue);

ASSERT_EQUALS(3, values.back().intvalue);

code = "x = (2<5) ? 2 : 3;\n";

values = tokenValues(code, "?");

ASSERT_EQUALS(1U, values.size());

ASSERT_EQUALS(2, values.front().intvalue);

code = "x = 123 ? : 456;\n";

values = tokenValues(code, "?");

ASSERT_EQUALS(1U, values.size());

ASSERT_EQUALS(123, values.empty() ? 0 : values.front().intvalue);

code = "int f() {\n"

" const int i = 1;\n"

" int x = i < 0 ? 0 : 1;\n"

" return x;\n"

"}";

ASSERT_EQUALS(true, testValueOfX(code, 4U, 1));

// ~

code = "x = ~0U;";

settings.platform(cppcheck::Platform::Native); // ensure platform is native

values = tokenValues(code,"~");

ASSERT_EQUALS(1U, values.size());

ASSERT_EQUALS(~0U, values.back().intvalue);

// !

code = "void f(int x) {\n"

" a = !x;\n"

" if (x==0) {}\n"

"}";

values = removeImpossible(tokenValues(code, "!"));

ASSERT_EQUALS(1U, values.size());

ASSERT_EQUALS(1, values.back().intvalue);

// unary minus