[MAINT] Use std::size_t from cstddef and use dpctl::tensor::ssize_t where ssize_t is used

CHANGELOG.md

@@ -42,6 +42,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Add support of CV-qualifiers in `is_complex<T>` helper [gh-1900](https://github.com/IntelPython/dpctl/pull/1900)
 * Tuning work for elementwise functions with modest performance gains (under 10%) [gh-1889](https://github.com/IntelPython/dpctl/pull/1889)
 * Support for Python 3.13 for `dpctl` [gh-1941](https://github.com/IntelPython/dpctl/pull/1941)
+* Change libtensor to use `std::size_t` and `dpctl::tensor::ssize_t` throughout and fix missing includes for `std::size_t` and `size_t` [gh-1950](https://github.com/IntelPython/dpctl/pull/1950)
 
 ## [0.18.3] - Dec. 07, 2024
 

dpctl/_host_task_util.hpp

@@ -31,6 +31,7 @@
 
 #pragma once
 #include <exception>
+#include <stddef.h>
 #include <sycl/sycl.hpp>
 
 #include "Python.h"

dpctl/apis/include/dpctl4pybind11.hpp

@@ -27,8 +27,10 @@
 
 #include "dpctl_capi.h"
 #include <complex>
+#include <cstddef> // for std::size_t for C++ linkage
 #include <memory>
 #include <pybind11/pybind11.h>
+#include <stddef.h> // for size_t for C linkage
 #include <stdexcept>
 #include <sycl/sycl.hpp>
 #include <utility>
@@ -759,7 +761,7 @@ class usm_memory : public py::object
      *  lifetime of the USM allocation.
      */
     usm_memory(void *usm_ptr,
-               size_t nbytes,
+               std::size_t nbytes,
                const sycl::queue &q,
                std::shared_ptr<void> shptr)
     {
@@ -819,7 +821,7 @@ class usm_memory : public py::object
         return reinterpret_cast<char *>(MRef);
     }
 
-    size_t get_nbytes() const
+    std::size_t get_nbytes() const
     {
         auto const &api = ::dpctl::detail::dpctl_capi::get();
         Py_MemoryObject *mem_obj = reinterpret_cast<Py_MemoryObject *>(m_ptr);

dpctl/tensor/libtensor/include/kernels/accumulators.hpp

@@ -24,6 +24,7 @@
 
 #pragma once
 #include <array>
+#include <cstddef>
 #include <cstdint>
 #include <limits>
 #include <new>
@@ -47,6 +48,7 @@ namespace kernels
 namespace accumulators
 {
 
+using dpctl::tensor::ssize_t;
 using namespace dpctl::tensor::offset_utils;
 
 template <typename T> T ceiling_quotient(T n, T m) { return (n + m - 1) / m; }

dpctl/tensor/libtensor/include/kernels/alignment.hpp

@@ -30,7 +30,7 @@ namespace kernels
 namespace alignment_utils
 {
 
-static constexpr size_t required_alignment = 64UL;
+static constexpr std::size_t required_alignment = 64UL;
 
 template <std::uintptr_t alignment, typename Ptr> bool is_aligned(Ptr p)
 {

dpctl/tensor/libtensor/include/kernels/boolean_advanced_indexing.hpp

@@ -23,6 +23,7 @@
 //===---------------------------------------------------------------------===//
 
 #pragma once
+#include <cstddef>
 #include <cstdint>
 #include <limits>
 #include <sycl/sycl.hpp>
@@ -42,6 +43,7 @@ namespace kernels
 namespace indexing
 {
 
+using dpctl::tensor::ssize_t;
 using namespace dpctl::tensor::offset_utils;
 
 template <typename OrthogIndexerT,
@@ -55,7 +57,7 @@ struct MaskedExtractStridedFunctor
     MaskedExtractStridedFunctor(const dataT *src_data_p,
                                 const indT *cumsum_data_p,
                                 dataT *dst_data_p,
-                                size_t masked_iter_size,
+                                std::size_t masked_iter_size,
                                 const OrthogIndexerT &orthog_src_dst_indexer_,
                                 const MaskedSrcIndexerT &masked_src_indexer_,
                                 const MaskedDstIndexerT &masked_dst_indexer_,
@@ -81,7 +83,7 @@ struct MaskedExtractStridedFunctor
 
         const std::size_t max_offset = masked_nelems + 1;
         for (std::uint32_t i = l_i; i < lacc.size(); i += lws) {
-            const size_t offset = masked_block_start + i;
+            const std::size_t offset = masked_block_start + i;
             lacc[i] = (offset == 0)           ? indT(0)
                       : (offset < max_offset) ? cumsum[offset - 1]
                                               : cumsum[masked_nelems - 1] + 1;
@@ -99,9 +101,10 @@ struct MaskedExtractStridedFunctor
         if (mask_set && (masked_i < masked_nelems)) {
             const auto &orthog_offsets = orthog_src_dst_indexer(orthog_i);
 
-            const size_t total_src_offset = masked_src_indexer(masked_i) +
-                                            orthog_offsets.get_first_offset();
-            const size_t total_dst_offset =
+            const std::size_t total_src_offset =
+                masked_src_indexer(masked_i) +
+                orthog_offsets.get_first_offset();
+            const std::size_t total_dst_offset =
                 masked_dst_indexer(current_running_count - 1) +
                 orthog_offsets.get_second_offset();
 
@@ -113,7 +116,7 @@ struct MaskedExtractStridedFunctor
     const dataT *src = nullptr;
     const indT *cumsum = nullptr;
     dataT *dst = nullptr;
-    const size_t masked_nelems = 0;
+    const std::size_t masked_nelems = 0;
     // has nd, shape, src_strides, dst_strides for
     // dimensions that ARE NOT masked
     const OrthogIndexerT orthog_src_dst_indexer;
@@ -136,7 +139,7 @@ struct MaskedPlaceStridedFunctor
     MaskedPlaceStridedFunctor(dataT *dst_data_p,
                               const indT *cumsum_data_p,
                               const dataT *rhs_data_p,
-                              size_t masked_iter_size,
+                              std::size_t masked_iter_size,
                               const OrthogIndexerT &orthog_dst_rhs_indexer_,
                               const MaskedDstIndexerT &masked_dst_indexer_,
                               const MaskedRhsIndexerT &masked_rhs_indexer_,
@@ -157,12 +160,12 @@ struct MaskedPlaceStridedFunctor
         const std::uint32_t l_i = ndit.get_local_id(1);
         const std::uint32_t lws = ndit.get_local_range(1);
 
-        const size_t masked_i = ndit.get_global_id(1);
-        const size_t masked_block_start = masked_i - l_i;
+        const std::size_t masked_i = ndit.get_global_id(1);
+        const std::size_t masked_block_start = masked_i - l_i;
 
         const std::size_t max_offset = masked_nelems + 1;
         for (std::uint32_t i = l_i; i < lacc.size(); i += lws) {
-            const size_t offset = masked_block_start + i;
+            const std::size_t offset = masked_block_start + i;
             lacc[i] = (offset == 0)           ? indT(0)
                       : (offset < max_offset) ? cumsum[offset - 1]
                                               : cumsum[masked_nelems - 1] + 1;
@@ -180,9 +183,10 @@ struct MaskedPlaceStridedFunctor
         if (mask_set && (masked_i < masked_nelems)) {
             const auto &orthog_offsets = orthog_dst_rhs_indexer(orthog_i);
 
-            const size_t total_dst_offset = masked_dst_indexer(masked_i) +
-                                            orthog_offsets.get_first_offset();
-            const size_t total_rhs_offset =
+            const std::size_t total_dst_offset =
+                masked_dst_indexer(masked_i) +
+                orthog_offsets.get_first_offset();
+            const std::size_t total_rhs_offset =
                 masked_rhs_indexer(current_running_count - 1) +
                 orthog_offsets.get_second_offset();
 
@@ -194,7 +198,7 @@ struct MaskedPlaceStridedFunctor
     dataT *dst = nullptr;
     const indT *cumsum = nullptr;
     const dataT *rhs = nullptr;
-    const size_t masked_nelems = 0;
+    const std::size_t masked_nelems = 0;
     // has nd, shape, dst_strides, rhs_strides for
     // dimensions that ARE NOT masked
     const OrthogIndexerT orthog_dst_rhs_indexer;
@@ -450,8 +454,8 @@ sycl::event masked_extract_some_slices_strided_impl(
 
     const std::size_t lws = get_lws(masked_extent);
 
-    const size_t n_groups = ((masked_extent + lws - 1) / lws);
-    const size_t orthog_extent = static_cast<size_t>(orthog_nelems);
+    const std::size_t n_groups = ((masked_extent + lws - 1) / lws);
+    const std::size_t orthog_extent = static_cast<std::size_t>(orthog_nelems);
 
     sycl::range<2> gRange{orthog_extent, n_groups * lws};
     sycl::range<2> lRange{1, lws};
@@ -809,7 +813,7 @@ sycl::event non_zero_indexes_impl(sycl::queue &exec_q,
             const std::size_t masked_block_start = group_i * lws;
 
             for (std::uint32_t i = l_i; i < lacc.size(); i += lws) {
-                const size_t offset = masked_block_start + i;
+                const std::size_t offset = masked_block_start + i;
                 lacc[i] = (offset == 0) ? indT1(0)
                           : (offset - 1 < masked_extent)
                               ? cumsum_data[offset - 1]

dpctl/tensor/libtensor/include/kernels/clip.hpp

@@ -25,6 +25,7 @@
 #pragma once
 #include <algorithm>
 #include <complex>
+#include <cstddef>
 #include <cstdint>
 #include <sycl/sycl.hpp>
 #include <type_traits>
@@ -45,6 +46,7 @@ namespace kernels
 namespace clip
 {
 
+using dpctl::tensor::ssize_t;
 using namespace dpctl::tensor::offset_utils;
 
 using dpctl::tensor::kernels::alignment_utils::
@@ -85,14 +87,14 @@ template <typename T,
 class ClipContigFunctor
 {
 private:
-    size_t nelems = 0;
+    std::size_t nelems = 0;
     const T *x_p = nullptr;
     const T *min_p = nullptr;
     const T *max_p = nullptr;
     T *dst_p = nullptr;
 
 public:
-    ClipContigFunctor(size_t nelems_,
+    ClipContigFunctor(std::size_t nelems_,
                       const T *x_p_,
                       const T *min_p_,
                       const T *max_p_,
@@ -110,30 +112,30 @@ class ClipContigFunctor
         if constexpr (is_complex<T>::value || !enable_sg_loadstore) {
             const std::uint16_t sgSize =
                 ndit.get_sub_group().get_local_range()[0];
-            const size_t gid = ndit.get_global_linear_id();
-            const uint16_t nelems_per_sg = sgSize * nelems_per_wi;
+            const std::size_t gid = ndit.get_global_linear_id();
+            const std::uint16_t nelems_per_sg = sgSize * nelems_per_wi;
 
-            const size_t start =
+            const std::size_t start =
                 (gid / sgSize) * (nelems_per_sg - sgSize) + gid;
-            const size_t end = std::min(nelems, start + nelems_per_sg);
+            const std::size_t end = std::min(nelems, start + nelems_per_sg);
 
-            for (size_t offset = start; offset < end; offset += sgSize) {
+            for (std::size_t offset = start; offset < end; offset += sgSize) {
                 dst_p[offset] = clip(x_p[offset], min_p[offset], max_p[offset]);
             }
         }
         else {
             auto sg = ndit.get_sub_group();
             const std::uint16_t sgSize = sg.get_max_local_range()[0];
 
-            const size_t base =
+            const std::size_t base =
                 nelems_per_wi * (ndit.get_group(0) * ndit.get_local_range(0) +
                                  sg.get_group_id()[0] * sgSize);
 
             if (base + nelems_per_wi * sgSize < nelems) {
                 sycl::vec<T, vec_sz> dst_vec;
 #pragma unroll
                 for (std::uint8_t it = 0; it < n_vecs * vec_sz; it += vec_sz) {
-                    const size_t idx = base + it * sgSize;
+                    const std::size_t idx = base + it * sgSize;
                     auto x_multi_ptr = sycl::address_space_cast<
                         sycl::access::address_space::global_space,
                         sycl::access::decorated::yes>(&x_p[idx]);
@@ -162,8 +164,8 @@ class ClipContigFunctor
                 }
             }
             else {
-                const size_t lane_id = sg.get_local_id()[0];
-                for (size_t k = base + lane_id; k < nelems; k += sgSize) {
+                const std::size_t lane_id = sg.get_local_id()[0];
+                for (std::size_t k = base + lane_id; k < nelems; k += sgSize) {
                     dst_p[k] = clip(x_p[k], min_p[k], max_p[k]);
                 }
             }
@@ -175,7 +177,7 @@ template <typename T, int vec_sz, int n_vecs> class clip_contig_kernel;
 
 typedef sycl::event (*clip_contig_impl_fn_ptr_t)(
     sycl::queue &,
-    size_t,
+    std::size_t,
     const char *,
     const char *,
     const char *,
@@ -184,7 +186,7 @@ typedef sycl::event (*clip_contig_impl_fn_ptr_t)(
 
 template <typename T>
 sycl::event clip_contig_impl(sycl::queue &q,
-                             size_t nelems,
+                             std::size_t nelems,
                              const char *x_cp,
                              const char *min_cp,
                              const char *max_cp,
@@ -199,10 +201,10 @@ sycl::event clip_contig_impl(sycl::queue &q,
     sycl::event clip_ev = q.submit([&](sycl::handler &cgh) {
         cgh.depends_on(depends);
 
-        size_t lws = 64;
+        std::size_t lws = 64;
         constexpr std::uint8_t vec_sz = 4;
         constexpr std::uint8_t n_vecs = 2;
-        const size_t n_groups =
+        const std::size_t n_groups =
             ((nelems + lws * n_vecs * vec_sz - 1) / (lws * n_vecs * vec_sz));
         const auto gws_range = sycl::range<1>(n_groups * lws);
         const auto lws_range = sycl::range<1>(lws);
@@ -258,7 +260,7 @@ template <typename T, typename IndexerT> class ClipStridedFunctor
 
     void operator()(sycl::id<1> id) const
     {
-        size_t gid = id[0];
+        std::size_t gid = id[0];
         auto offsets = indexer(static_cast<ssize_t>(gid));
         dst_p[offsets.get_fourth_offset()] = clip(
             x_p[offsets.get_first_offset()], min_p[offsets.get_second_offset()],
@@ -270,7 +272,7 @@ template <typename T, typename IndexerT> class clip_strided_kernel;
 
 typedef sycl::event (*clip_strided_impl_fn_ptr_t)(
     sycl::queue &,
-    size_t,
+    std::size_t,
     int,
     const char *,
     const char *,
@@ -285,7 +287,7 @@ typedef sycl::event (*clip_strided_impl_fn_ptr_t)(
 
 template <typename T>
 sycl::event clip_strided_impl(sycl::queue &q,
-                              size_t nelems,
+                              std::size_t nelems,
                               int nd,
                               const char *x_cp,
                               const char *min_cp,