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aligned_alloc.c revision 1.1.1.2 
      1 #include "test/jemalloc_test.h"
      2 
      3 #define MAXALIGN (((size_t)1) << 23)
      4 
      5 /*
      6  * On systems which can't merge extents, tests that call this function generate
      7  * a lot of dirty memory very quickly.  Purging between cycles mitigates
      8  * potential OOM on e.g. 32-bit Windows.
      9  */
     10 static void
     11 purge(void) {
     12 	expect_d_eq(mallctl("arena.0.purge", NULL, NULL, NULL, 0), 0,
     13 	    "Unexpected mallctl error");
     14 }
     15 
     16 TEST_BEGIN(test_alignment_errors) {
     17 	size_t alignment;
     18 	void *p;
     19 
     20 	alignment = 0;
     21 	set_errno(0);
     22 	p = aligned_alloc(alignment, 1);
     23 	expect_false(p != NULL || get_errno() != EINVAL,
     24 	    "Expected error for invalid alignment %zu", alignment);
     25 
     26 	for (alignment = sizeof(size_t); alignment < MAXALIGN;
     27 	    alignment <<= 1) {
     28 		set_errno(0);
     29 		p = aligned_alloc(alignment + 1, 1);
     30 		expect_false(p != NULL || get_errno() != EINVAL,
     31 		    "Expected error for invalid alignment %zu",
     32 		    alignment + 1);
     33 	}
     34 }
     35 TEST_END
     36 
     37 
     38 /*
     39  * GCC "-Walloc-size-larger-than" warning detects when one of the memory
     40  * allocation functions is called with a size larger than the maximum size that
     41  * they support. Here we want to explicitly test that the allocation functions
     42  * do indeed fail properly when this is the case, which triggers the warning.
     43  * Therefore we disable the warning for these tests.
     44  */
     45 JEMALLOC_DIAGNOSTIC_PUSH
     46 JEMALLOC_DIAGNOSTIC_IGNORE_ALLOC_SIZE_LARGER_THAN
     47 
     48 TEST_BEGIN(test_oom_errors) {
     49 	size_t alignment, size;
     50 	void *p;
     51 
     52 #if LG_SIZEOF_PTR == 3
     53 	alignment = UINT64_C(0x8000000000000000);
     54 	size      = UINT64_C(0x8000000000000000);
     55 #else
     56 	alignment = 0x80000000LU;
     57 	size      = 0x80000000LU;
     58 #endif
     59 	set_errno(0);
     60 	p = aligned_alloc(alignment, size);
     61 	expect_false(p != NULL || get_errno() != ENOMEM,
     62 	    "Expected error for aligned_alloc(%zu, %zu)",
     63 	    alignment, size);
     64 
     65 #if LG_SIZEOF_PTR == 3
     66 	alignment = UINT64_C(0x4000000000000000);
     67 	size      = UINT64_C(0xc000000000000001);
     68 #else
     69 	alignment = 0x40000000LU;
     70 	size      = 0xc0000001LU;
     71 #endif
     72 	set_errno(0);
     73 	p = aligned_alloc(alignment, size);
     74 	expect_false(p != NULL || get_errno() != ENOMEM,
     75 	    "Expected error for aligned_alloc(%zu, %zu)",
     76 	    alignment, size);
     77 
     78 	alignment = 0x10LU;
     79 #if LG_SIZEOF_PTR == 3
     80 	size = UINT64_C(0xfffffffffffffff0);
     81 #else
     82 	size = 0xfffffff0LU;
     83 #endif
     84 	set_errno(0);
     85 	p = aligned_alloc(alignment, size);
     86 	expect_false(p != NULL || get_errno() != ENOMEM,
     87 	    "Expected error for aligned_alloc(&p, %zu, %zu)",
     88 	    alignment, size);
     89 }
     90 TEST_END
     91 
     92 /* Re-enable the "-Walloc-size-larger-than=" warning */
     93 JEMALLOC_DIAGNOSTIC_POP
     94 
     95 TEST_BEGIN(test_alignment_and_size) {
     96 #define NITER 4
     97 	size_t alignment, size, total;
     98 	unsigned i;
     99 	void *ps[NITER];
    100 
    101 	for (i = 0; i < NITER; i++) {
    102 		ps[i] = NULL;
    103 	}
    104 
    105 	for (alignment = 8;
    106 	    alignment <= MAXALIGN;
    107 	    alignment <<= 1) {
    108 		total = 0;
    109 		for (size = 1;
    110 		    size < 3 * alignment && size < (1U << 31);
    111 		    size += (alignment >> (LG_SIZEOF_PTR-1)) - 1) {
    112 			for (i = 0; i < NITER; i++) {
    113 				ps[i] = aligned_alloc(alignment, size);
    114 				if (ps[i] == NULL) {
    115 					char buf[BUFERROR_BUF];
    116 
    117 					buferror(get_errno(), buf, sizeof(buf));
    118 					test_fail(
    119 					    "Error for alignment=%zu, "
    120 					    "size=%zu (%#zx): %s",
    121 					    alignment, size, size, buf);
    122 				}
    123 				total += TEST_MALLOC_SIZE(ps[i]);
    124 				if (total >= (MAXALIGN << 1)) {
    125 					break;
    126 				}
    127 			}
    128 			for (i = 0; i < NITER; i++) {
    129 				if (ps[i] != NULL) {
    130 					free(ps[i]);
    131 					ps[i] = NULL;
    132 				}
    133 			}
    134 		}
    135 		purge();
    136 	}
    137 #undef NITER
    138 }
    139 TEST_END
    140 
    141 TEST_BEGIN(test_zero_alloc) {
    142 	void *res = aligned_alloc(8, 0);
    143 	assert(res);
    144 	size_t usable = TEST_MALLOC_SIZE(res);
    145 	assert(usable > 0);
    146 	free(res);
    147 }
    148 TEST_END
    149 
    150 int
    151 main(void) {
    152 	return test(
    153 	    test_alignment_errors,
    154 	    test_oom_errors,
    155 	    test_alignment_and_size,
    156 	    test_zero_alloc);
    157 }
    158