cppcheck/test/testcondition.cpp at master · napcode/cppcheck · GitHub

History

3792 lines (3309 loc) · 142 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

780

781

782

783

784

785

786

787

788

789

790

791

792

793

794

795

796

797

798

799

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

818

819

820

821

822

823

824

825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

849

850

851

852

853

854

855

856

857

858

859

860

861

862

863

864

865

866

867

868

869

870

871

872

873

874

875

876

877

878

879

880

881

882

883

884

885

886

887

888

889

890

891

892

893

894

895

896

897

898

899

900

901

902

903

904

905

906

907

908

909

910

911

912

913

914

915

916

917

918

919

920

921

922

923

924

925

926

927

928

929

930

931

932

933

934

935

936

937

938

939

940

941

942

943

944

945

946

947

948

949

950

951

952

953

954

955

956

957

958

959

960

961

962

963

964

965

966

967

968

969

970

971

972

973

974

975

976

977

978

979

980

981

982

983

984

985

986

987

988

989

990

991

992

993

994

995

996

997

998

999

1000

* Cppcheck - A tool for static C/C++ code analysis

* 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 "checkcondition.h"

#include "library.h"

#include "settings.h"

#include "testsuite.h"

#include "tokenize.h"

#include <simplecpp.h>

#include <tinyxml2.h>

#include <map>

#include <vector>

class TestCondition : public TestFixture {

public:

TestCondition() : TestFixture("TestCondition") {

}

private:

Settings settings0;

Settings settings1;

void run() OVERRIDE {

LOAD_LIB_2(settings0.library, "qt.cfg");

LOAD_LIB_2(settings0.library, "std.cfg");

settings0.addEnabled("style");

settings0.addEnabled("warning");

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

"<def>\n"

" <function name=\"bar\"> <pure/> </function>\n"

"</def>";

tinyxml2::XMLDocument xmldoc;

xmldoc.Parse(cfg, sizeof(cfg));

settings1.addEnabled("style");

settings1.addEnabled("warning");

settings1.library.load(xmldoc);

TEST_CASE(assignAndCompare); // assignment and comparison don't match

TEST_CASE(mismatchingBitAnd); // overlapping bitmasks

TEST_CASE(comparison); // CheckCondition::comparison test cases

TEST_CASE(multicompare); // mismatching comparisons

TEST_CASE(overlappingElseIfCondition); // overlapping conditions in if and else-if

TEST_CASE(oppositeElseIfCondition); // opposite conditions in if and else-if

TEST_CASE(checkBadBitmaskCheck);

TEST_CASE(incorrectLogicOperator1);

TEST_CASE(incorrectLogicOperator2);

TEST_CASE(incorrectLogicOperator3);

TEST_CASE(incorrectLogicOperator4);

TEST_CASE(incorrectLogicOperator5); // complex expressions

TEST_CASE(incorrectLogicOperator6); // char literals

TEST_CASE(incorrectLogicOperator7); // opposite expressions: (expr || !expr)

TEST_CASE(incorrectLogicOperator8); // !

TEST_CASE(incorrectLogicOperator9);

TEST_CASE(incorrectLogicOperator10); // enum

TEST_CASE(incorrectLogicOperator11);

TEST_CASE(incorrectLogicOperator12);

TEST_CASE(incorrectLogicOperator13);

TEST_CASE(incorrectLogicOperator14);

TEST_CASE(secondAlwaysTrueFalseWhenFirstTrueError);

TEST_CASE(incorrectLogicOp_condSwapping);

TEST_CASE(testBug5895);

TEST_CASE(testBug5309);

TEST_CASE(modulo);

TEST_CASE(oppositeInnerCondition);

TEST_CASE(oppositeInnerConditionPointers);

TEST_CASE(oppositeInnerConditionClass);

TEST_CASE(oppositeInnerConditionUndeclaredVariable);

TEST_CASE(oppositeInnerConditionAlias);

TEST_CASE(oppositeInnerCondition2);

TEST_CASE(oppositeInnerCondition3);

TEST_CASE(oppositeInnerConditionAnd);

TEST_CASE(oppositeInnerConditionEmpty);

TEST_CASE(oppositeInnerConditionFollowVar);

TEST_CASE(identicalInnerCondition);

TEST_CASE(identicalConditionAfterEarlyExit);

TEST_CASE(innerConditionModified);

TEST_CASE(clarifyCondition1); // if (a = b() < 0)

TEST_CASE(clarifyCondition2); // if (a & b == c)

TEST_CASE(clarifyCondition3); // if (! a & b)

TEST_CASE(clarifyCondition4); // ticket #3110

TEST_CASE(clarifyCondition5); // #3609 CWinTraits<WS_CHILD|WS_VISIBLE>..

TEST_CASE(clarifyCondition6); // #3818

TEST_CASE(clarifyCondition7);

TEST_CASE(clarifyCondition8);

TEST_CASE(alwaysTrue);

TEST_CASE(alwaysTrueInfer);

TEST_CASE(multiConditionAlwaysTrue);

TEST_CASE(duplicateCondition);

TEST_CASE(checkInvalidTestForOverflow);

TEST_CASE(checkConditionIsAlwaysTrueOrFalseInsideIfWhile);

TEST_CASE(alwaysTrueFalseInLogicalOperators);

TEST_CASE(pointerAdditionResultNotNull);

TEST_CASE(duplicateConditionalAssign);

}

void check(const char code[], const char* filename = "test.cpp", bool inconclusive = false) {

// Clear the error buffer..

errout.str("");

settings0.inconclusive = inconclusive;

// Raw tokens..

std::vector<std::string> files(1, filename);

std::istringstream istr(code);

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

// Preprocess..

simplecpp::TokenList tokens2(files);

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

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

// Tokenizer..

Tokenizer tokenizer(&settings0, this);

tokenizer.createTokens(&tokens2);

tokenizer.simplifyTokens1("");

// Run checks..

CheckCondition checkCondition;

checkCondition.runChecks(&tokenizer, &settings0, this);

}

void assignAndCompare() {

// &

check("void foo(int x)\n"

"{\n"

" int y = x & 4;\n"

" if (y == 3);\n"

"}");

ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) Mismatching assignment and comparison, comparison 'y==3' is always false.\n", errout.str());

check("void foo(int x)\n"

"{\n"

" int y = x & 4;\n"

" if (y != 3);\n"

"}");

ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) Mismatching assignment and comparison, comparison 'y!=3' is always true.\n", errout.str());

// |

check("void foo(int x) {\n"

" int y = x | 0x14;\n"

" if (y == 0x710);\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Mismatching assignment and comparison, comparison 'y==1808' is always false.\n", errout.str());

check("void foo(int x) {\n"

" int y = x | 0x14;\n"

" if (y == 0x71f);\n"

"}");

ASSERT_EQUALS("", errout.str());

// various simple assignments

check("void foo(int x) {\n"

" int y = (x+1) | 1;\n"

" if (y == 2);\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Mismatching assignment and comparison, comparison 'y==2' is always false.\n", errout.str());

check("void foo() {\n"

" int y = 1 | x();\n"

" if (y == 2);\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Mismatching assignment and comparison, comparison 'y==2' is always false.\n", errout.str());

// multiple conditions

check("void foo(int x) {\n"

" int y = x & 4;\n"

" if ((y == 3) && (z == 1));\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Mismatching assignment and comparison, comparison 'y==3' is always false.\n", errout.str());

check("void foo(int x) {\n"

" int y = x & 4;\n"

" if ((x==123) || ((y == 3) && (z == 1)));\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Mismatching assignment and comparison, comparison 'y==3' is always false.\n", errout.str());

check("void f(int x) {\n"

" int y = x & 7;\n"

" if (setvalue(&y) && y != 8);\n"

"}");

ASSERT_EQUALS("", errout.str());

// recursive checking into scopes

check("void f(int x) {\n"

" int y = x & 7;\n"

" if (z) y=0;\n"

" else { if (y==8); }\n" // always false

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (style) Mismatching assignment and comparison, comparison 'y==8' is always false.\n", errout.str());

// while

check("void f(int x) {\n"

" int y = x & 7;\n"

" while (y==8);\n" // local variable => always false

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Mismatching assignment and comparison, comparison 'y==8' is always false.\n", errout.str());

check("void f(int x) {\n"

" extern int y; y = x & 7;\n"

" while (y==8);\n" // non-local variable => no error

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" int a = 100;\n"

" while (x) {\n"

" int y = 16 | a;\n"

" while (y != 0) y--;\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void g(int x);\n"

"void f(int x) {\n"

" int a = 100;\n"

" while (x) {\n"

" int y = 16 | a;\n"

" while (y != 0) g(y);\n"

" }\n"

"}");

ASSERT_EQUALS(

"[test.cpp:5] -> [test.cpp:6]: (style) Mismatching assignment and comparison, comparison 'y!=0' is always true.\n",

errout.str());

check("void g(int &x);\n"

"void f(int x) {\n"

" int a = 100;\n"

" while (x) {\n"

" int y = 16 | a;\n"

" while (y != 0) g(y);\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

// calling function

check("void f(int x) {\n"

" int y = x & 7;\n"

" do_something();\n"

" if (y==8);\n" // local variable => always false

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (style) Mismatching assignment and comparison, comparison 'y==8' is always false.\n", errout.str());

check("void f(int x) {\n"

" int y = x & 7;\n"

" do_something(&y);\n" // passing variable => no error

" if (y==8);\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void do_something(int);\n"

"void f(int x) {\n"

" int y = x & 7;\n"

" do_something(y);\n"

" if (y==8);\n"

"}");

ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (style) Mismatching assignment and comparison, comparison 'y==8' is always false.\n", errout.str());

check("void f(int x) {\n"

" extern int y; y = x & 7;\n"

" do_something();\n"

" if (y==8);\n" // non-local variable => no error

"}");

ASSERT_EQUALS("", errout.str());

// #4434 : false positive: ?:

check("void f(int x) {\n"

" x = x & 1;\n"

" x = x & 1 ? 1 : -1;\n"

" if(x != -1) { }\n"

"}");

ASSERT_EQUALS("", errout.str());

// #4735

check("void f() {\n"

" int x = *(char*)&0x12345678;\n"

" if (x==18) { }\n"

"}");

ASSERT_EQUALS("", errout.str());

// bailout: no variable info

check("void foo(int x) {\n"

" y = 2 | x;\n" // y not declared => no error

" if(y == 1) {}\n"

"}");

ASSERT_EQUALS("", errout.str());

// bailout: negative number

check("void foo(int x) {\n"

" int y = -2 | x;\n" // negative number => no error

" if (y==1) {}\n"

"}");

ASSERT_EQUALS("", errout.str());

// bailout: pass variable to function

check("void foo(int x) {\n"

" int y = 2 | x;\n"

" bar(&y);\n" // pass variable to function => no error

" if (y==1) {}\n"

"}");

ASSERT_EQUALS("", errout.str());

// no crash on unary operator& (#5643)

check("SdrObject* ApplyGraphicToObject() {\n"

" if (&rHitObject) {}\n"

" else if (rHitObject.IsClosedObj() && !&rHitObject) { }\n"

"}");

ASSERT_EQUALS("", errout.str());

// #5695: increment

check("void f(int a0, int n) {\n"

" int c = a0 & 3;\n"

" for (int a = 0; a < n; a++) {\n"

" c++;\n"

" if (c == 4)\n"

" c = 0;\n"

" }\n"

"}\n");

ASSERT_EQUALS("", errout.str());

check("void f(int a) {\n" // #6662

" int x = a & 1;\n"

" while (x <= 4) {\n"

" if (x != 5) {}\n"

" }\n"

"}\n");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (style) Mismatching assignment and comparison, comparison 'x!=5' is always true.\n", errout.str());

check("void f(int a) {\n" // #6662

" int x = a & 1;\n"

" while ((x += 4) < 10) {\n"

" if (x != 5) {}\n"

" }\n"

"}\n");

ASSERT_EQUALS("", errout.str());

check("void f() {\n"

" int x = 100;\n"

" while (x) {\n"

" g(x);\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void g(int x);\n"

"void f() {\n"

" int x = 100;\n"

" while (x) {\n"

" g(x);\n"

" }\n"

"}");

ASSERT_EQUALS("[test.cpp:4]: (style) Condition 'x' is always true\n", errout.str());

check("void g(int & x);\n"

"void f() {\n"

" int x = 100;\n"

" while (x) {\n"

" g(x);\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void mismatchingBitAnd() {

check("void f(int a) {\n"

" int b = a & 0xf0;\n"

" b &= 1;\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Mismatching bitmasks. Result is always 0 (X = Y & 0xf0; Z = X & 0x1; => Z=0).\n", errout.str());

check("void f(int a) {\n"

" int b = a & 0xf0;\n"

" int c = b & 1;\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Mismatching bitmasks. Result is always 0 (X = Y & 0xf0; Z = X & 0x1; => Z=0).\n", errout.str());

check("void f(int a) {\n"

" int b = a;"

" switch (x) {\n"

" case 1: b &= 1; break;\n"

" case 2: b &= 2; break;\n"

" };\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void comparison() {

// CheckCondition::comparison test cases

// '=='

check("void f(int a) {\n assert( (a & 0x07) == 8U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X & 0x7) == 0x8' is always false.\n",errout.str());

check("void f(int a) {\n assert( (a & b & 4 & c ) == 3 );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X & 0x4) == 0x3' is always false.\n", errout.str());

check("void f(int a) {\n assert( (a | 0x07) == 8U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X | 0x7) == 0x8' is always false.\n",errout.str());

check("void f(int a) {\n assert( (a & 0x07) == 7U );\n}");

ASSERT_EQUALS("", errout.str());

check("void f(int a) {\n assert( (a | 0x01) == -15 );\n}");

ASSERT_EQUALS("", errout.str());

// '!='

check("void f(int a) {\n assert( (a & 0x07) != 8U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X & 0x7) != 0x8' is always true.\n",errout.str());

check("void f(int a) {\n assert( (a | 0x07) != 8U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X | 0x7) != 0x8' is always true.\n",errout.str());

check("void f(int a) {\n assert( (a & 0x07) != 7U );\n}");

ASSERT_EQUALS("", errout.str());

check("void f(int a) {\n assert( (a | 0x07) != 7U );\n}");

ASSERT_EQUALS("", errout.str());

// '>='

check("void f(int a) {\n assert( (a & 0x07) >= 8U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X & 0x7) >= 0x8' is always false.\n",errout.str());

check("void f(unsigned int a) {\n assert( (a | 0x7) >= 7U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X | 0x7) >= 0x7' is always true.\n",errout.str());

check("void f(int a) {\n assert( (a & 0x07) >= 7U );\n}");

ASSERT_EQUALS("",errout.str());

check("void f(int a) {\n assert( (a | 0x07) >= 8U );\n}");

ASSERT_EQUALS("",errout.str()); //correct for negative 'a'

// '>'

check("void f(int a) {\n assert( (a & 0x07) > 7U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X & 0x7) > 0x7' is always false.\n",errout.str());

check("void f(unsigned int a) {\n assert( (a | 0x7) > 6U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X | 0x7) > 0x6' is always true.\n",errout.str());

check("void f(int a) {\n assert( (a & 0x07) > 6U );\n}");

ASSERT_EQUALS("",errout.str());

check("void f(int a) {\n assert( (a | 0x07) > 7U );\n}");

ASSERT_EQUALS("",errout.str()); //correct for negative 'a'

// '<='

check("void f(int a) {\n assert( (a & 0x07) <= 7U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X & 0x7) <= 0x7' is always true.\n",errout.str());

check("void f(unsigned int a) {\n assert( (a | 0x08) <= 7U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X | 0x8) <= 0x7' is always false.\n",errout.str());

check("void f(int a) {\n assert( (a & 0x07) <= 6U );\n}");

ASSERT_EQUALS("",errout.str());

check("void f(int a) {\n assert( (a | 0x08) <= 7U );\n}");

ASSERT_EQUALS("",errout.str()); //correct for negative 'a'

// '<'

check("void f(int a) {\n assert( (a & 0x07) < 8U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X & 0x7) < 0x8' is always true.\n",errout.str());

check("void f(unsigned int a) {\n assert( (a | 0x07) < 7U );\n}");

ASSERT_EQUALS("[test.cpp:2]: (style) Expression '(X | 0x7) < 0x7' is always false.\n",errout.str());

check("void f(int a) {\n assert( (a & 0x07) < 3U );\n}");

ASSERT_EQUALS("",errout.str());

check("void f(int a) {\n assert( (a | 0x07) < 7U );\n}");

ASSERT_EQUALS("",errout.str()); //correct for negative 'a'

}

void multicompare() {

check("void foo(int x)\n"

"{\n"

" if (x & 7);\n"

" else { if (x == 1); }\n"

"}");

ASSERT_EQUALS("[test.cpp:4]: (style) Expression is always false because 'else if' condition matches previous condition at line 3.\n", errout.str());

check("void foo(int x)\n"

"{\n"

" if (x & 7);\n"

" else { if (x & 1); }\n"

"}");

ASSERT_EQUALS("[test.cpp:4]: (style) Expression is always false because 'else if' condition matches previous condition at line 3.\n", errout.str());

check("extern int bar() __attribute__((pure));\n"

"void foo(int x)\n"

"{\n"

" if ( bar() >1 && b) {}\n"

" else if (bar() >1 && b) {}\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (style) Expression is always false because 'else if' condition matches previous condition at line 4.\n", errout.str());

checkPureFunction("extern int bar();\n"

"void foo(int x)\n"

"{\n"

" if ( bar() >1 && b) {}\n"

" else if (bar() >1 && b) {}\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (style) Expression is always false because 'else if' condition matches previous condition at line 4.\n", errout.str());

// 7284

check("void foo() {\n"

" if (a) {}\n"

" else if (!!a) {}\n"

"}\n");

ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());

}

void checkPureFunction(const char code[]) {

// Clear the error buffer..

errout.str("");

// Tokenize..

Tokenizer tokenizer(&settings1, this);

std::istringstream istr(code);

tokenizer.tokenize(istr, "test.cpp");

CheckCondition checkCondition;

checkCondition.runChecks(&tokenizer, &settings1, this);

}

void overlappingElseIfCondition() {

check("void f(int a, int &b) {\n"

" if (a) { b = 1; }\n"

" else { if (a) { b = 2; } }\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Condition 'a' is always false\n", errout.str());

check("void f(int a, int &b) {\n"

" if (a) { b = 1; }\n"

" else { if (a) { b = 2; } }\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Condition 'a' is always false\n", errout.str());

check("void f(int a, int &b) {\n"

" if (a == 1) { b = 1; }\n"

" else { if (a == 2) { b = 2; }\n"

" else { if (a == 1) { b = 3; } } }\n"

"}");

ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (style) Condition 'a==1' is always false\n", errout.str());

check("void f(int a, int &b) {\n"

" if (a == 1) { b = 1; }\n"

" else { if (a == 2) { b = 2; }\n"

" else { if (a == 2) { b = 3; } } }\n"

"}");

ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) Condition 'a==2' is always false\n", errout.str());

check("void f(int a, int &b) {\n"

" if (a++) { b = 1; }\n"

" else { if (a++) { b = 2; }\n"

" else { if (a++) { b = 3; } } }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int a, int &b) {\n"

" if (!strtok(NULL, \" \")) { b = 1; }\n"

" else { if (!strtok(NULL, \" \")) { b = 2; } }\n"

"}");

ASSERT_EQUALS("", errout.str());

{

check("void f(Class &c) {\n"

" if (c.dostuff() == 3) {}\n"

" else { if (c.dostuff() == 3) {} }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(const Class &c) {\n"

" if (c.dostuff() == 3) {}\n"

" else { if (c.dostuff() == 3) {} }\n"

"}");

ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());

}

check("void f(int a, int &b) {\n"

" x = x / 2;\n"

" if (x < 100) { b = 1; }\n"

" else { x = x / 2; if (x < 100) { b = 2; } }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int i) {\n"

" if(i == 0x02e2000000 || i == 0xa0c6000000)\n"

" foo(i);\n"

"}");

ASSERT_EQUALS("", errout.str());

// ticket 3689 ( avoid false positive )

check("int fitInt(long long int nValue){\n"

" if( nValue < 0x7fffffffLL )\n"

" {\n"

" return 32;\n"

" }\n"

" if( nValue < 0x7fffffffffffLL )\n"

" {\n"

" return 48;\n"

" }\n"

" else {\n"

" if( nValue < 0x7fffffffffffffffLL )\n"

" {\n"

" return 64;\n"

" } else\n"

" {\n"

" return -1;\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(WIDGET *widget) {\n"

" if (dynamic_cast<BUTTON*>(widget)){}\n"

" else if (dynamic_cast<LABEL*>(widget)){}\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n" // #6482

" if (x & 1) {}\n"

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

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if (x & 15) {}\n"

" else if (x == 40) {}\n"

"}");

ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());

check("void f(int x) {\n"

" if (x == sizeof(double)) {}\n"

" else { if (x == sizeof(long double)) {} }"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if (x & 0x08) {}\n"

" else if (x & 0xF8) {}\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if (x & 0xF8) {}\n"

" else if (x & 0x08) {}\n"

"}");

ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());

check("void f(bool a, bool b) {\n"

" if(a && b){}\n"

" else if( !!b && !!a){}\n"

"}\n");

ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());

check("void f(bool a, bool b) {\n"

" if(a && b){}\n"

" else if( !!b && a){}\n"

"}\n");

ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());

check("void f(bool a, bool b) {\n"

" if(a && b){}\n"

" else if( b && !!a){}\n"

"}\n");

ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());

check("void f(bool a, bool b) {\n"

" if(a && b){}\n"

" else if( b && !(!a)){}\n"

"}\n");

ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());

check("void f(bool a, bool b) {\n"

" if(a && b){}\n"

" else if( !!b && !(!a)){}\n"

"}\n");

ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());

check("void f(bool a, bool b) {\n"

" if(a && b){}\n"

" else if( !!(b) && !!(a+b)){}\n"

"}\n");

ASSERT_EQUALS("", errout.str());

// #8168

check("enum MaskValues\n"

"{\n"

" Value1 = 0x00000001,\n"

" Value2 = 0x00000002\n"

"};\n"

"void TestFunction(int value) {\n"

" if ( value & (int)Value1 ) {}\n"

" else if ( value & (int)Value2 ) {}\n"

"}\n");

ASSERT_EQUALS("", errout.str());

}

void oppositeElseIfCondition() {

setMultiline();

check("void f(int x) {\n"

" if (x) {}\n"

" else if (!x) {}\n"

"}");

ASSERT_EQUALS("test.cpp:3:style:Condition '!x' is always true\n"

"test.cpp:2:note:condition 'x'\n"

"test.cpp:3:note:Condition '!x' is always true\n", errout.str());

check("void f(int x) {\n"

" int y = x;\n"

" if (x) {}\n"

" else if (!y) {}\n"

"}");

ASSERT_EQUALS("test.cpp:4:style:Expression is always true because 'else if' condition is opposite to previous condition at line 3.\n"

"test.cpp:2:note:'y' is assigned value 'x' here.\n"

"test.cpp:3:note:first condition\n"

"test.cpp:4:note:else if condition is opposite to first condition\n", errout.str());

}

void checkBadBitmaskCheck() {

check("bool f(int x) {\n"

" bool b = x | 0x02;\n"

" return b;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("bool f(int x) {\n"

" bool b = 0x02 | x;\n"

" return b;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("int f(int x) {\n"

" int b = x | 0x02;\n"

" return b;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("bool f(int x) {\n"

" bool b = x & 0x02;\n"

" return b;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("bool f(int x) {\n"

" if(x | 0x02)\n"

" return b;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("bool f(int x) {\n"

" int y = 0x1;\n"

" if(b) y = 0;\n"

" if(x | y)\n"

" return b;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("bool f(int x) {\n"

" foo(a && (x | 0x02));\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("int f(int x) {\n"

" return (x | 0x02) ? 0 : 5;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("int f(int x) {\n"

" return x ? (x | 0x02) : 5;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("bool f(int x) {\n"

" return x | 0x02;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("bool f(int x) {\n"

" if (x) {\n"

" return x | 0x02;\n"

" }\n"

" return 0;\n"

"}");

ASSERT_EQUALS("[test.cpp:3]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("const bool f(int x) {\n"

" return x | 0x02;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("struct F {\n"

" static const bool f(int x) {\n"

" return x | 0x02;\n"

" }\n"

"};");

ASSERT_EQUALS("[test.cpp:3]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("struct F {\n"

" typedef bool b_t;\n"

"};\n"

"F::b_t f(int x) {\n"

" return x | 0x02;\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (warning) Result of operator '|' is always true if one operand is non-zero. Did you intend to use '&'?\n", errout.str());

check("int f(int x) {\n"

" return x | 0x02;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void create_rop_masks_4( rop_mask_bits *bits) {\n"

"DWORD mask_offset;\n"

"BYTE *and_bits = bits->and;\n"

"rop_mask *rop_mask;\n"

"and_bits[mask_offset] |= (rop_mask->and & 0x0f);\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(unsigned a, unsigned b) {\n"

" unsigned cmd1 = b & 0x0F;\n"

" if (cmd1 | a) {\n"

" if (b == 0x0C) {}\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void incorrectLogicOperator1() {

check("void f(int x) {\n"

" if ((x != 1) || (x != 3))\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x != 1 || x != 3.\n", errout.str());

check("void f(int x) {\n"

" if (1 != x || 3 != x)\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x != 1 || x != 3.\n", errout.str());

check("void f(int x) {\n"

" if (x<0 && !x) {}\n"

"}\n");

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 0 && !x.\n", errout.str());

check("void f(int x) {\n"

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

"}\n");

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x == 0 && x.\n", errout.str());

check("void f(int x) {\n" // ast..

" if (y == 1 && x == 1 && x == 7) { }\n"

"}\n");

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x == 1 && x == 7.\n", errout.str());

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

" if (x != 1 || y != 1)\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("", errout.str());

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

" if ((y == 1) && (x != 1) || (x != 3))\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("", errout.str());

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

" if ((x != 1) || (x != 3) && (y == 1))\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if ((x != 1) && (x != 3))\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if ((x == 1) || (x == 3))\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("", errout.str());

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

" if ((x != 1) || (y != 3))\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("", errout.str());

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

" if ((x != hotdog) || (y != hotdog))\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("", errout.str());

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

" if ((x != 5) || (y != 5))\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if ((x != 5) || (x != 6))\n"

" a++;\n"

"}\n"

);

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x != 5 || x != 6.\n", errout.str());

check("void f(unsigned int a, unsigned int b, unsigned int c) {\n"

" if((a != b) || (c != b) || (c != a))\n"

" {\n"

" return true;\n"

" }\n"

" return false;\n"

"}\n"

);

ASSERT_EQUALS("", errout.str());

}

void incorrectLogicOperator2() {

check("void f(float x) {\n"

" if ((x == 1) && (x == 1.0))\n"

" a++;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if ((x == 1) && (x == 0x00000001))\n"

" a++;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if (x == 1 && x == 3)\n"

" a++;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x == 1 && x == 3.\n", errout.str());

check("void f(int x) {\n"

" if (x == 1.0 && x == 3.0)\n"

" a++;\n"

"}");

ASSERT_EQUALS("", errout.str()); // float comparisons with == and != are not checked right now - such comparison is a bad idea

check("void f(float x) {\n"

" if (x == 1 && x == 1.0)\n"

" a++;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void bar(float f) {\n" // #5246

" if ((f > 0) && (f < 1)) {}\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if (x < 1 && x > 1)\n"

" a++;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 1.\n", errout.str());

check("void f(int x) {\n"

" if (x < 1.0 && x > 1.0)\n"

" a++;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1.0 && x > 1.0.\n", errout.str());

check("void f(int x) {\n"

" if (x < 1 && x > 1.0)\n"

" a++;\n"

"}");

ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 1.0.\n", errout.str());

check("void f(int x) {\n"

" if (x >= 1.0 && x <= 1.001)\n"

" a++;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f(int x) {\n"

" if (x < 1 && x > 3)\n"

" a++;\n"

"}");

View remainder of file in raw view

cppcheck/test/testcondition.cpp at master · napcode/cppcheck · GitHub

Navigation Menu

Expand file tree

Breadcrumbs

testcondition.cpp

Latest commit

History

Breadcrumbs

testcondition.cpp

File metadata and controls

Footer

Footer navigation