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[SYCL] Return nullptr when allocation size is zero in usm allocator #12765

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merged 4 commits into from
Feb 21, 2024
Merged

[SYCL] Return nullptr when allocation size is zero in usm allocator #12765

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1b14c69
Return nullptr when allocation size is zero
uditagarwal97 Feb 20, 2024
454156b
Added test case
uditagarwal97 Feb 20, 2024
2145b66
Fix test case
uditagarwal97 Feb 20, 2024
7f1e0d3
Address reviews
uditagarwal97 Feb 21, 2024
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3 changes: 3 additions & 0 deletions sycl/include/sycl/usm/usm_allocator.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,9 @@ class usm_allocator {
T *allocate(size_t NumberOfElements, const detail::code_location CodeLoc =
detail::code_location::current()) {

if (!NumberOfElements)
return nullptr;

auto Result = reinterpret_cast<T *>(
aligned_alloc(getAlignment(), NumberOfElements * sizeof(value_type),
MDevice, MContext, AllocKind, MPropList, CodeLoc));
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30 changes: 30 additions & 0 deletions sycl/test-e2e/USM/usm_allocator_zero_allocation.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
// RUN: %{build} -o %t.out
// RUN: %{run} %t.out

#include <sycl/sycl.hpp>

using namespace sycl;

template <usm::alloc alloc_kind> void test(queue &q) {
sycl::usm_allocator<int, alloc_kind> ua(q);
int *p = ua.allocate(0);

assert(!p && "Our implementation of usm_allocator is expected to return a "
"null pointer when allocation size is zero.");

ua.deallocate(p, 0);
}

int main() {
queue q;
auto dev = q.get_device();

if (dev.has(aspect::usm_host_allocations)) {
test<usm::alloc::host>(q);
}
if (dev.has(aspect::usm_shared_allocations)) {
test<usm::alloc::shared>(q);
}

return 0;
}
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