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31 // Author: Arun Sharma
33 #include "config_for_unittests.h"
34 #include "system-alloc.h"
36 #if defined HAVE_STDINT_H
37 #include <stdint.h> // to get uintptr_t
38 #elif defined HAVE_INTTYPES_H
39 #include <inttypes.h> // another place uintptr_t might be defined
41 #include <sys/types.h>
44 #include "base/logging.h" // for Check_GEImpl, Check_LTImpl, etc
45 #include <gperftools/malloc_extension.h> // for MallocExtension::instance
46 #include "common.h" // for kAddressBits
48 class ArraySysAllocator : public SysAllocator {
50 // Was this allocator invoked at least once?
53 ArraySysAllocator() : SysAllocator() {
58 void* Alloc(size_t size, size_t *actual_size, size_t alignment) {
61 if (size > kArraySize) {
65 void *result = &array_[ptr_];
66 uintptr_t ptr = reinterpret_cast<uintptr_t>(result);
72 // Try to get more memory for alignment
73 size_t extra = alignment - (ptr & (alignment-1));
75 CHECK_LT(ptr_ + size, kArraySize);
77 if ((ptr & (alignment-1)) != 0) {
78 ptr += alignment - (ptr & (alignment-1));
82 return reinterpret_cast<void *>(ptr);
89 static const int kArraySize = 8 * 1024 * 1024;
90 char array_[kArraySize];
91 // We allocate the next chunk from here
95 const int ArraySysAllocator::kArraySize;
98 static void TestBasicInvoked() {
99 MallocExtension::instance()->SetSystemAllocator(&a);
101 // An allocation size that is likely to trigger the system allocator.
102 // XXX: this is implementation specific.
103 char *p = new char[1024 * 1024];
106 // Make sure that our allocator was invoked.
110 #if 0 // could port this to various OSs, but won't bother for now
111 TEST(AddressBits, CpuVirtualBits) {
112 // Check that kAddressBits is as least as large as either the number of bits
113 // in a pointer or as the number of virtual bits handled by the processor.
114 // To be effective this test must be run on each processor model.
115 const int kPointerBits = 8 * sizeof(void*);
116 const int kImplementedVirtualBits = NumImplementedVirtualBits();
118 CHECK_GE(kAddressBits, std::min(kImplementedVirtualBits, kPointerBits));
122 static void TestBasicRetryFailTest() {
123 // Check with the allocator still works after a failed allocation.
125 // There is no way to call malloc and guarantee it will fail. malloc takes a
126 // size_t parameter and the C++ standard does not constrain the size of
127 // size_t. For example, consider an implementation where size_t is 32 bits
128 // and pointers are 64 bits.
130 // It is likely, though, that sizeof(size_t) == sizeof(void*). In that case,
131 // the first allocation here might succeed but the second allocation must
134 // If the second allocation succeeds, you will have to rewrite or
135 // disable this test.
136 // The weird parens are to avoid macro-expansion of 'max' on windows.
137 const size_t kHugeSize = (std::numeric_limits<size_t>::max)() / 2;
138 void* p1 = malloc(kHugeSize);
139 void* p2 = malloc(kHugeSize);
141 if (p1 != NULL) free(p1);
143 char* q = new char[1024];
148 int main(int argc, char** argv) {
150 TestBasicRetryFailTest();