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1 // This file is part of Eigen, a lightweight C++ template library
2 // for linear algebra.
3 //
4 // Copyright (C) 2011 Benoit Jacob <jacob.benoit.1@gmail.com>
5 //
6 // This Source Code Form is subject to the terms of the Mozilla
7 // Public License v. 2.0. If a copy of the MPL was not distributed
8 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9 
10 #include "main.h"
11 
12 #define VERIFY_THROWS_BADALLOC(a) {                           \
13     bool threw = false;                                       \
14     try {                                                     \
15       a;                                                      \
16     }                                                         \
17     catch (std::bad_alloc&) { threw = true; }                 \
18     VERIFY(threw && "should have thrown bad_alloc: " #a);     \
19   }
20 
21 typedef DenseIndex Index;
22 
23 template<typename MatrixType>
triggerMatrixBadAlloc(Index rows,Index cols)24 void triggerMatrixBadAlloc(Index rows, Index cols)
25 {
26   VERIFY_THROWS_BADALLOC( MatrixType m(rows, cols) );
27   VERIFY_THROWS_BADALLOC( MatrixType m; m.resize(rows, cols) );
28   VERIFY_THROWS_BADALLOC( MatrixType m; m.conservativeResize(rows, cols) );
29 }
30 
31 template<typename VectorType>
triggerVectorBadAlloc(Index size)32 void triggerVectorBadAlloc(Index size)
33 {
34   VERIFY_THROWS_BADALLOC( VectorType v(size) );
35   VERIFY_THROWS_BADALLOC( VectorType v; v.resize(size) );
36   VERIFY_THROWS_BADALLOC( VectorType v; v.conservativeResize(size) );
37 }
38 
test_sizeoverflow()39 void test_sizeoverflow()
40 {
41   // there are 2 levels of overflow checking. first in PlainObjectBase.h we check for overflow in rows*cols computations.
42   // this is tested in tests of the form times_itself_gives_0 * times_itself_gives_0
43   // Then in Memory.h we check for overflow in size * sizeof(T) computations.
44   // this is tested in tests of the form times_4_gives_0 * sizeof(float)
45 
46   size_t times_itself_gives_0 = size_t(1) << (8 * sizeof(Index) / 2);
47   VERIFY(times_itself_gives_0 * times_itself_gives_0 == 0);
48 
49   size_t times_4_gives_0 = size_t(1) << (8 * sizeof(Index) - 2);
50   VERIFY(times_4_gives_0 * 4 == 0);
51 
52   size_t times_8_gives_0 = size_t(1) << (8 * sizeof(Index) - 3);
53   VERIFY(times_8_gives_0 * 8 == 0);
54 
55   triggerMatrixBadAlloc<MatrixXf>(times_itself_gives_0, times_itself_gives_0);
56   triggerMatrixBadAlloc<MatrixXf>(times_itself_gives_0 / 4, times_itself_gives_0);
57   triggerMatrixBadAlloc<MatrixXf>(times_4_gives_0, 1);
58 
59   triggerMatrixBadAlloc<MatrixXd>(times_itself_gives_0, times_itself_gives_0);
60   triggerMatrixBadAlloc<MatrixXd>(times_itself_gives_0 / 8, times_itself_gives_0);
61   triggerMatrixBadAlloc<MatrixXd>(times_8_gives_0, 1);
62 
63   triggerVectorBadAlloc<VectorXf>(times_4_gives_0);
64 
65   triggerVectorBadAlloc<VectorXd>(times_8_gives_0);
66 }
67