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comparison liboctave/UMFPACK/UMFPACK/Source/umf_malloc.c @ 5164:57077d0ddc8e

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[project @ 2005-02-25 19:55:24 by jwe]
author jwe
date Fri, 25 Feb 2005 19:55:28 +0000
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5163:9f3299378193 5164:57077d0ddc8e
1 /* ========================================================================== */
2 /* === UMF_malloc =========================================================== */
3 /* ========================================================================== */
4
5 /* -------------------------------------------------------------------------- */
6 /* UMFPACK Version 4.4, Copyright (c) 2005 by Timothy A. Davis. CISE Dept, */
7 /* Univ. of Florida. All Rights Reserved. See ../Doc/License for License. */
8 /* web: http://www.cise.ufl.edu/research/sparse/umfpack */
9 /* -------------------------------------------------------------------------- */
10
11 /*
12 Allocate a block of n objects, each of a given size. This routine does not
13 handle the case when the size is 1 (allocating char's) because of potential
14 integer overflow. UMFPACK never does that.
15 Also maintains the UMFPACK malloc count.
16 */
17
18 #include "umf_internal.h"
19
20 #if defined (UMF_MALLOC_COUNT) || !defined (NDEBUG)
21
22 /*
23 UMF_malloc_count is a count of the objects malloc'd by UMFPACK. If you
24 suspect a memory leak in your program (caused by not properly destroying
25 the Symbolic and Numeric objects) then compile with -DUMF_MALLOC_COUNT and
26 check value of UMF_malloc_count. By default, UMF_MALLOC_COUNT is not
27 defined, and thus UMFPACK has no global variables.
28 */
29
30 GLOBAL Int UMF_malloc_count = 0 ;
31
32 #endif
33
34 #ifdef UMF_TCOV_TEST
35 /* For exhaustive statement coverage testing only! */
36 GLOBAL int umf_fail, umf_fail_lo, umf_fail_hi ;
37 GLOBAL int umf_realloc_fail, umf_realloc_lo, umf_realloc_hi ;
38 #endif
39
40 GLOBAL void *UMF_malloc
41 (
42 Int n_objects,
43 size_t size_of_object
44 )
45 {
46 size_t size ;
47 void *p ;
48
49 #ifdef UMF_TCOV_TEST
50 /* For exhaustive statement coverage testing only! */
51 /* Pretend to fail, to test out-of-memory conditions. */
52 umf_fail-- ;
53 if (umf_fail <= umf_fail_hi && umf_fail >= umf_fail_lo)
54 {
55 DEBUG0 (("umf_malloc: Pretend to fail %d %d %d\n",
56 umf_fail, umf_fail_hi, umf_fail_lo)) ;
57 return ((void *) NULL) ;
58 }
59 #endif
60
61 DEBUG0 (("UMF_malloc: ")) ;
62
63 /* make sure that we allocate something */
64 n_objects = MAX (1, n_objects) ;
65
66 size = (size_t) n_objects ;
67 ASSERT (size_of_object > 1) ;
68 if (size > Int_MAX / size_of_object)
69 {
70 /* object is too big for integer pointer arithmetic */
71 return ((void *) NULL) ;
72 }
73 size *= size_of_object ;
74
75 /* see umf_config.h for the memory allocator selection */
76 p = ALLOCATE (size) ;
77
78 DEBUG0 ((ID"\n", (Int) p)) ;
79
80 #if defined (UMF_MALLOC_COUNT) || !defined (NDEBUG)
81 if (p)
82 {
83 /* One more object has been malloc'ed. Keep track of the count. */
84 /* (purely for sanity checks). */
85 UMF_malloc_count++ ;
86 DEBUG0 ((" successful, new malloc count: "ID"\n", UMF_malloc_count)) ;
87 }
88 #endif
89
90 return (p) ;
91 }