Add ASAN CI build workflow

.github/workflows/sanitizers.yml

@@ -0,0 +1,114 @@
+name: Sanitizers
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches: [master]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.job }}-${{ github.ref }}
+  cancel-in-progress: true
+defaults:
+  run:
+    shell: bash -e -l {0}
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    name: sanitizer / ${{ matrix.sys.compiler }} ${{ matrix.sys.version }} / ${{ matrix.config.name }} / ${{ matrix.sys.name }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-24.04]
+        sys:
+        - {compiler: clang, version: '21', name: asan, sanitizer: address}
+        - {compiler: clang, version: '21', name: msan, sanitizer: memory}
+        - {compiler: clang, version: '21', name: lsan, sanitizer: leak}
+        - {compiler: clang, version: '21', name: ubsan, sanitizer: undefined}
+        config:
+        - {name: Debug}
+
+    steps:
+
+    - name: Install LLVM and Clang
+      if: matrix.sys.compiler == 'clang'
+      run: |
+        wget https://apt.llvm.org/llvm.sh
+        chmod +x llvm.sh
+        sudo ./llvm.sh ${{matrix.sys.version}}
+        sudo apt-get install -y clang-tools-${{matrix.sys.version}}
+        sudo update-alternatives --install /usr/bin/clang++         clang++             /usr/bin/clang++-${{matrix.sys.version}} 200
+        sudo update-alternatives --install /usr/bin/clang           clang               /usr/bin/clang-${{matrix.sys.version}} 200
+        sudo update-alternatives --install /usr/bin/clang-scan-deps clang-scan-deps     /usr/bin/clang-scan-deps-${{matrix.sys.version}} 200
+        sudo update-alternatives --set clang /usr/bin/clang-${{matrix.sys.version}}
+        sudo update-alternatives --set clang++ /usr/bin/clang++-${{matrix.sys.version}}
+        sudo update-alternatives --set clang-scan-deps /usr/bin/clang-scan-deps-${{matrix.sys.version}}
+
+    - name: Checkout code
+      uses: actions/checkout@v6
+
+    - name: Set conda environment
+      uses: mamba-org/setup-micromamba@main
+      with:
+        environment-name: myenv
+        environment-file: environment-dev.yml
+        init-shell: bash
+        cache-downloads: true
+
+    - name: Configure using CMake
+      run: |
+        export CC=clang
+        export CXX=clang++
+        cmake -G Ninja \
+          -Bbuild \
+          -DCMAKE_BUILD_TYPE=${{matrix.config.name}} \
+          -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX \
+          -DBUILD_TESTS=ON \
+          -DUSE_SANITIZER=${{ matrix.sys.sanitizer }}
+
+    - name: Build tests
+      working-directory: build
+      run: cmake --build . --config ${{matrix.config.name}} --target test_xtensor_lib --parallel 8
+
+    - name: Run tests
+      working-directory: build
+      run: |
+        SAN=${{ matrix.sys.sanitizer }}
+        case "$SAN" in
+          address)
+            export ASAN_OPTIONS=log_path=asan_log_:alloc_dealloc_mismatch=0:halt_on_error=0:handle_abort=0
+            export ASAN_SAVE_DUMPS=AsanDump.dmp
+            ;;
+          memory)
+            export MSAN_OPTIONS=log_path=msan_log_:halt_on_error=0
+            ;;
+          leak)
+            export LSAN_OPTIONS=log_path=lsan_log_:halt_on_error=0
+            ;;
+          undefined)
+            export UBSAN_OPTIONS=log_path=ubsan_log_:halt_on_error=0:print_stacktrace=1
+            ;;
+        esac
+        ctest -R ^xtest$ --output-on-failure
+
+    - name: Upload sanitizer log
+      if: always()
+      uses: actions/upload-artifact@v6
+      with:
+        name: sanitizer-log-${{ matrix.sys.sanitizer }}-${{ matrix.sys.compiler }}-${{ matrix.sys.version }}-${{ matrix.config.name }}-${{ runner.os }}
+        path: '**/*san_log_*'
+        if-no-files-found: ignore
+
+    - name: Upload sanitizer dump
+      if: always()
+      uses: actions/upload-artifact@v6
+      with:
+        name: sanitizer-dump-${{ matrix.sys.sanitizer }}-${{ matrix.sys.compiler }}-${{ matrix.sys.version }}-${{ matrix.config.name }}-${{ runner.os }}
+        path: '**/AsanDump.dmp'
+        if-no-files-found: ignore
+
+    - name: Return errors if sanitizer log content is not empty
+      if: always()
+      run: |
+        if [ -n "$(find build/test -name '*san_log_*' -type f -size +0 2>/dev/null)" ]; then
+          echo "Sanitizer detected errors. See the log for details."
+          exit 1
+        fi

cmake/sanitizers.cmake

@@ -0,0 +1,47 @@
+set(AVALAIBLE_SANITIZERS "address;leak;memory;thread;undefined")
+OPTION(USE_SANITIZER "Enable sanitizer(s). Options are: ${AVALAIBLE_SANITIZERS}. Case insensitive; multiple options delimited by comma or space possible." "")
+string(TOLOWER "${USE_SANITIZER}" USE_SANITIZER)
+
+if((CMAKE_BUILD_TYPE IN_LIST "Debug;RelWithDebInfo") AND USE_SANITIZER)
+    message(FATAL_ERROR "❌ Sanitizer only supported in Debug and RelWithDebInfo build types.")
+endif()
+
+if(USE_SANITIZER)
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+        set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT "$<IF:$<AND:$<C_COMPILER_ID:MSVC>,$<CXX_COMPILER_ID:MSVC>>,$<$<CONFIG:Debug,RelWithDebInfo>:EditAndContinue>,$<$<CONFIG:Debug,RelWithDebInfo>:ProgramDatabase>>")
+
+        if(USE_SANITIZER MATCHES "address")
+            list(APPEND SANITIZER_COMPILE_OPTIONS /fsanitize=address /D_DISABLE_VECTOR_ANNOTATION /D_DISABLE_STRING_ANNOTATION)
+        else()
+            message(FATAL_ERROR "❌ Sanitizer not supported by MSVC: ${USE_SANITIZER}. It only supports 'address'.")
+        endif()
+    elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "MSVC")
+        if(USE_SANITIZER MATCHES "address")
+            list(APPEND SANITIZER_COMPILE_OPTIONS /fsanitize=address /D_DISABLE_VECTOR_ANNOTATION /D_DISABLE_STRING_ANNOTATION)
+            list(APPEND SANITIZER_LINK_LIBRARIES clang_rt.asan_dynamic-x86_64 clang_rt.asan_dynamic_runtime_thunk-x86_64)
+        else()
+            message(FATAL_ERROR "❌ Sanitizer not supported by Clang-MSVC: ${USE_SANITIZER}. It only supports 'address'.")
+        endif()
+    elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" OR CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+        foreach(sanitizer ${USE_SANITIZER})
+            if(NOT ${sanitizer} IN_LIST AVALAIBLE_SANITIZERS)
+                message(FATAL_ERROR "❌ Sanitizer not supported: ${sanitizer}. It should be one of: ${AVALAIBLE_SANITIZERS}.")
+            endif()
+            list(APPEND SANITIZER_COMPILE_OPTIONS -fsanitize=${sanitizer})
+            list(APPEND SANITIZER_LINK_OPTIONS -fsanitize=${sanitizer})
+            if (${sanitizer} MATCHES "memory")
+                list(APPEND SANITIZER_LINK_LIBRARIES -fsanitize-memory-track-origins -fPIE -pie)
+                list(APPEND SANITIZER_LINK_OPTIONS -fsanitize-memory-track-origins -fPIE -pie)
+            endif()
+        endforeach()
+        list(APPEND SANITIZER_COMPILE_OPTIONS -fno-omit-frame-pointer)
+    else()
+        message(FATAL_ERROR "❌ Sanitizer: Unsupported compiler: ${CMAKE_CXX_COMPILER_ID}")
+    endif()
+
+    list(REMOVE_DUPLICATES SANITIZER_COMPILE_OPTIONS)
+    list(REMOVE_DUPLICATES SANITIZER_LINK_OPTIONS)
+    list(REMOVE_DUPLICATES SANITIZER_LINK_LIBRARIES)
+
+    message(STATUS "🔍 Using sanitizer: ${USE_SANITIZER}")
+endif()

include/xtensor/views/index_mapper.hpp

@@ -193,7 +193,7 @@ namespace xt
          * @throws Assertion failure if `i != 0` for integral slices.
          * @throws Assertion failure if `i >= slice.size()` for non-integral slices.
          */
-        template <size_t I, std::integral Index>
+        template <size_t I, access_t ACCESS, std::integral Index>
         size_t map_ith_index(const view_type& view, const Index i) const;
 
         /**
@@ -490,16 +490,16 @@ namespace xt
     {
         if constexpr (ACCESS == access_t::SAFE)
         {
-            return container.at(map_ith_index<Is>(view, indices[Is])...);
+            return container.at(map_ith_index<Is, ACCESS>(view, indices[Is])...);
         }
         else
         {
-            return container(map_ith_index<Is>(view, indices[Is])...);
+            return container(map_ith_index<Is, ACCESS>(view, indices[Is])...);
         }
     }
 
     template <class UnderlyingContainer, class... Slices>
-    template <size_t I, std::integral Index>
+    template <size_t I, access_t ACCESS, std::integral Index>
     auto
     index_mapper<xt::xview<UnderlyingContainer, Slices...>>::map_ith_index(const view_type& view, const Index i) const
         -> size_t
@@ -515,14 +515,51 @@ namespace xt
 
             if constexpr (std::is_integral_v<current_slice>)
             {
-                assert(i == 0);
+                if constexpr (ACCESS == access_t::SAFE)
+                {
+                    if (i != 0)
+                    {
+                        XTENSOR_THROW(std::out_of_range, "Index out of range in index_mapper access");
+                    }
+                }
+                else
+                {
+                    assert(i == 0);
+                }
                 return size_t(slice);
             }
+            else if constexpr (xt::detail::is_xall_slice<std::decay_t<current_slice>>::value)
+            {
+                return size_t(i);
+            }
             else
             {
                 using slice_size_type = typename current_slice::size_type;
-                assert(i < slice.size());
-                return size_t(slice(static_cast<slice_size_type>(i)));
+                const auto slice_index = static_cast<slice_size_type>(i);
+
+                if constexpr (ACCESS == access_t::SAFE)
+                {
+                    if constexpr (std::is_signed_v<slice_size_type>)
+                    {
+                        if (slice_index < 0 || slice_index >= slice.size())
+                        {
+                            XTENSOR_THROW(std::out_of_range, "Index out of range in index_mapper access");
+                        }
+                    }
+                    else if (slice_index >= slice.size())
+                    {
+                        XTENSOR_THROW(std::out_of_range, "Index out of range in index_mapper access");
+                    }
+                }
+                else
+                {
+                    if constexpr (std::is_signed_v<slice_size_type>)
+                    {
+                        assert(slice_index >= 0);
+                    }
+                    assert(slice_index < slice.size());
+                }
+                return size_t(slice(slice_index));
             }
         }
         else

test/CMakeLists.txt

@@ -231,6 +231,9 @@ endforeach()
 
 file(GLOB XTENSOR_PREPROCESS_FILES files/cppy_source/*.cppy)
 
+# Sanitizer support
+include(${CMAKE_SOURCE_DIR}/cmake/sanitizers.cmake)
+
 # This target should only be run when the test source files have been changed.
 add_custom_target(
     preprocess_cppy
@@ -258,6 +261,8 @@ foreach(filename IN LISTS COMMON_BASE XTENSOR_TESTS)
     endif()
     target_include_directories(${targetname} PRIVATE ${XTENSOR_INCLUDE_DIR})
     target_link_libraries(${targetname} PRIVATE xtensor doctest::doctest ${CMAKE_THREAD_LIBS_INIT})
+    target_compile_options(${targetname} PRIVATE  $<$<BOOL:USE_SANITIZER>:${SANITIZER_COMPILE_OPTIONS}>)
+    target_link_options(${targetname} PRIVATE  $<$<BOOL:USE_SANITIZER>:${SANITIZER_LINK_OPTIONS}>)
     add_custom_target(
         x${targetname}
         COMMAND ${targetname}
@@ -282,6 +287,9 @@ if(XTENSOR_USE_OPENMP)
     target_compile_definitions(test_xtensor_lib PRIVATE XTENSOR_USE_OPENMP)
 endif()
 
+target_compile_options(test_xtensor_lib PRIVATE  $<$<BOOL:USE_SANITIZER>:${SANITIZER_COMPILE_OPTIONS}>)
+target_link_options(test_xtensor_lib PRIVATE  $<$<BOOL:USE_SANITIZER>:${SANITIZER_LINK_OPTIONS}>)
+
 target_include_directories(test_xtensor_lib PRIVATE ${XTENSOR_INCLUDE_DIR})
 target_link_libraries(test_xtensor_lib PRIVATE xtensor  doctest::doctest ${CMAKE_THREAD_LIBS_INIT})
 

test/test_xadapt.cpp

@@ -132,6 +132,8 @@ namespace xt
             a1(1, 0) = static_cast<int>(i);
             EXPECT_EQ(i, data[i * size + st]);
         }
+
+        delete[] data;
     }
 
     TEST(xarray_adaptor, pointer_acquire_ownership)
@@ -300,6 +302,8 @@ namespace xt
             a1(1, 0) = static_cast<int>(i);
             EXPECT_EQ(i, data[i * size + st]);
         }
+
+        delete[] data;
     }
 
     TEST(xtensor_adaptor, pointer_const_no_ownership)

test/test_xbuffer_adaptor.cpp

@@ -201,6 +201,8 @@ namespace xt
         size_t size2 = 50;
         XT_EXPECT_THROW(adapt.resize(size2), std::runtime_error);
         EXPECT_EQ(adapt.size(), size1);
+
+        delete[] data1;
     }
 
     TEST(xbuffer_adaptor, no_owner_iterating)