[NFC] Add bazel support to cpu_features (#222)

4 files changed, 360 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index b68012d..f918154 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,9 @@ out/
 .vscode/
 .vs/
 *.swp
+
+# Bazel artifacts
+**/bazel-*
+
+# Per-user bazelrc files
+user.bazelrc
diff --git a/BUILD.bazel b/BUILD.bazel
new file mode 100644
index 0000000..e60e1c4
--- /dev/null
+++ b/BUILD.bazel
@@ -0,0 +1,320 @@
+# cpu_features, a cross platform C99 library to get cpu features at runtime.
+
+load("@bazel_skylib//lib:selects.bzl", "selects")
+load("//:bazel/platforms.bzl", "PLATFORM_CPU_ARM", "PLATFORM_CPU_ARM64", "PLATFORM_CPU_MIPS", "PLATFORM_CPU_PPC", "PLATFORM_CPU_X86_64")
+
+package(
+    default_visibility = ["//visibility:public"],
+    licenses = ["notice"],
+)
+
+exports_files(["LICENSE"])
+
+CC_FLAGS = [
+    "-Iinclude",
+]
+
+C99_FLAGS = CC_FLAGS + [
+    "-std=c99",
+    "-Wall",
+    "-Wextra",
+    "-Wmissing-declarations",
+    "-Wmissing-prototypes",
+    "-Wno-implicit-fallthrough",
+    "-Wno-unused-function",
+    "-Wold-style-definition",
+    "-Wshadow",
+    "-Wsign-compare",
+    "-Wstrict-prototypes",
+]
+
+cc_library(
+    name = "cpu_features_macros",
+    hdrs = ["include/cpu_features_macros.h"],
+    copts = C99_FLAGS,
+)
+
+cc_library(
+    name = "cpu_features_cache_info",
+    hdrs = ["include/cpu_features_cache_info.h"],
+    copts = C99_FLAGS,
+    deps = [":cpu_features_macros"],
+)
+
+cc_library(
+    name = "bit_utils",
+    hdrs = ["include/internal/bit_utils.h"],
+    copts = C99_FLAGS,
+    deps = [":cpu_features_macros"],
+)
+
+cc_test(
+    name = "bit_utils_test",
+    srcs = ["test/bit_utils_test.cc"],
+    copts = CC_FLAGS,
+    deps = [
+        ":bit_utils",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_library(
+    name = "memory_utils",
+    copts = C99_FLAGS,
+    textual_hdrs = [
+        "src/copy.inl",
+        "src/equals.inl",
+    ],
+)
+
+cc_library(
+    name = "string_view",
+    srcs = [
+        "src/string_view.c",
+    ],
+    hdrs = ["include/internal/string_view.h"],
+    copts = C99_FLAGS,
+    deps = [
+        ":cpu_features_macros",
+        ":memory_utils",
+    ],
+)
+
+cc_test(
+    name = "string_view_test",
+    srcs = ["test/string_view_test.cc"],
+    copts = CC_FLAGS,
+    deps = [
+        ":string_view",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_library(
+    name = "filesystem",
+    srcs = ["src/filesystem.c"],
+    hdrs = ["include/internal/filesystem.h"],
+    copts = C99_FLAGS,
+    deps = [":cpu_features_macros"],
+)
+
+cc_library(
+    name = "filesystem_for_testing",
+    testonly = 1,
+    srcs = [
+        "src/filesystem.c",
+        "test/filesystem_for_testing.cc",
+    ],
+    hdrs = [
+        "include/internal/filesystem.h",
+        "test/filesystem_for_testing.h",
+    ],
+    copts = CC_FLAGS,
+    defines = ["CPU_FEATURES_MOCK_FILESYSTEM"],
+    deps = [
+        ":cpu_features_macros",
+    ],
+)
+
+cc_library(
+    name = "stack_line_reader",
+    srcs = ["src/stack_line_reader.c"],
+    hdrs = ["include/internal/stack_line_reader.h"],
+    copts = C99_FLAGS,
+    defines = ["STACK_LINE_READER_BUFFER_SIZE=1024"],
+    deps = [
+        ":cpu_features_macros",
+        ":filesystem",
+        ":string_view",
+    ],
+)
+
+cc_test(
+    name = "stack_line_reader_test",
+    srcs = [
+        "include/internal/stack_line_reader.h",
+        "src/stack_line_reader.c",
+        "test/stack_line_reader_test.cc",
+    ],
+    copts = CC_FLAGS,
+    defines = ["STACK_LINE_READER_BUFFER_SIZE=16"],
+    deps = [
+        ":cpu_features_macros",
+        ":filesystem_for_testing",
+        ":string_view",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_library(
+    name = "stack_line_reader_to_use_with_filesystem_for_testing",
+    testonly = 1,
+    srcs = ["src/stack_line_reader.c"],
+    hdrs = ["include/internal/stack_line_reader.h"],
+    copts = C99_FLAGS,
+    defines = ["STACK_LINE_READER_BUFFER_SIZE=1024"],
+    deps = [
+        ":cpu_features_macros",
+        ":filesystem_for_testing",
+        ":string_view",
+    ],
+)
+
+cc_library(
+    name = "hwcaps",
+    srcs = ["src/hwcaps.c"],
+    hdrs = ["include/internal/hwcaps.h"],
+    copts = C99_FLAGS,
+    defines = ["HAVE_STRONG_GETAUXVAL"],
+    deps = [
+        ":cpu_features_macros",
+        ":filesystem",
+        ":string_view",
+    ],
+)
+
+cc_library(
+    name = "hwcaps_for_testing",
+    testonly = 1,
+    srcs = [
+        "src/hwcaps.c",
+        "test/hwcaps_for_testing.cc",
+    ],
+    hdrs = [
+        "include/internal/hwcaps.h",
+        "test/hwcaps_for_testing.h",
+    ],
+    copts = CC_FLAGS,
+    defines = [
+        "CPU_FEATURES_MOCK_GET_ELF_HWCAP_FROM_GETAUXVAL",
+        "CPU_FEATURES_TEST",
+    ],
+    deps = [
+        ":cpu_features_macros",
+        ":filesystem_for_testing",
+        ":string_view",
+    ],
+)
+
+cc_library(
+    name = "cpuinfo",
+    srcs = selects.with_or({
+        PLATFORM_CPU_X86_64: [
+            "src/impl_x86_freebsd.c",
+            "src/impl_x86_linux_or_android.c",
+            "src/impl_x86_macos.c",
+            "src/impl_x86_windows.c",
+        ],
+        PLATFORM_CPU_ARM: ["src/impl_arm_linux_or_android.c"],
+        PLATFORM_CPU_ARM64: ["src/impl_aarch64_linux_or_android.c"],
+        PLATFORM_CPU_MIPS: ["src/impl_mips_linux_or_android.c"],
+        PLATFORM_CPU_PPC: ["src/impl_ppc_linux.c"],
+    }),
+    hdrs = selects.with_or({
+        PLATFORM_CPU_X86_64: [
+            "include/cpuinfo_x86.h",
+            "include/internal/cpuid_x86.h",
+        ],
+        PLATFORM_CPU_ARM: ["include/cpuinfo_arm.h"],
+        PLATFORM_CPU_ARM64: ["include/cpuinfo_aarch64.h"],
+        PLATFORM_CPU_MIPS: ["include/cpuinfo_mips.h"],
+        PLATFORM_CPU_PPC: ["include/cpuinfo_ppc.h"],
+    }),
+    copts = C99_FLAGS,
+    textual_hdrs = selects.with_or({
+        PLATFORM_CPU_X86_64: ["src/impl_x86__base_implementation.inl"],
+        "//conditions:default": [],
+    }) + [
+        "src/define_introspection.inl",
+        "src/define_introspection_and_hwcaps.inl",
+    ],
+    deps = [
+        ":bit_utils",
+        ":cpu_features_cache_info",
+        ":cpu_features_macros",
+        ":filesystem",
+        ":hwcaps",
+        ":memory_utils",
+        ":stack_line_reader",
+        ":string_view",
+    ],
+)
+
+cc_library(
+    name = "cpuinfo_for_testing",
+    testonly = 1,
+    srcs = selects.with_or({
+        PLATFORM_CPU_X86_64: [
+            "src/impl_x86_freebsd.c",
+            "src/impl_x86_linux_or_android.c",
+            "src/impl_x86_macos.c",
+            "src/impl_x86_windows.c",
+        ],
+        PLATFORM_CPU_ARM: ["src/impl_arm_linux_or_android.c"],
+        PLATFORM_CPU_ARM64: ["src/impl_aarch64_linux_or_android.c"],
+        PLATFORM_CPU_MIPS: ["src/impl_mips_linux_or_android.c"],
+        PLATFORM_CPU_PPC: ["src/impl_ppc_linux.c"],
+    }),
+    hdrs = selects.with_or({
+        PLATFORM_CPU_X86_64: [
+            "include/cpuinfo_x86.h",
+            "include/internal/cpuid_x86.h",
+        ],
+        PLATFORM_CPU_ARM: ["include/cpuinfo_arm.h"],
+        PLATFORM_CPU_ARM64: ["include/cpuinfo_aarch64.h"],
+        PLATFORM_CPU_MIPS: ["include/cpuinfo_mips.h"],
+        PLATFORM_CPU_PPC: ["include/cpuinfo_ppc.h"],
+    }),
+    copts = C99_FLAGS,
+    defines = selects.with_or({
+        PLATFORM_CPU_X86_64: ["CPU_FEATURES_MOCK_CPUID_X86"],
+        "//conditions:default": [],
+    }),
+    textual_hdrs = selects.with_or({
+        PLATFORM_CPU_X86_64: ["src/impl_x86__base_implementation.inl"],
+        "//conditions:default": [],
+    }) + [
+        "src/define_introspection.inl",
+        "src/define_introspection_and_hwcaps.inl",
+    ],
+    deps = [
+        ":bit_utils",
+        ":cpu_features_cache_info",
+        ":cpu_features_macros",
+        ":filesystem_for_testing",
+        ":hwcaps_for_testing",
+        ":memory_utils",
+        ":stack_line_reader_to_use_with_filesystem_for_testing",
+        ":string_view",
+    ],
+)
+
+cc_test(
+    name = "cpuinfo_test",
+    srcs = selects.with_or({
+        PLATFORM_CPU_ARM64: ["test/cpuinfo_aarch64_test.cc"],
+        PLATFORM_CPU_ARM: ["test/cpuinfo_arm_test.cc"],
+        PLATFORM_CPU_MIPS: ["test/cpuinfo_mips_test.cc"],
+        PLATFORM_CPU_PPC: ["test/cpuinfo_ppc_test.cc"],
+        PLATFORM_CPU_X86_64: ["test/cpuinfo_x86_test.cc"],
+    }),
+    copts = CC_FLAGS,
+    deps = [
+        ":cpuinfo_for_testing",
+        ":filesystem_for_testing",
+        ":hwcaps_for_testing",
+        ":string_view",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_binary(
+    name = "list_cpu_features",
+    srcs = ["src/utils/list_cpu_features.c"],
+    copts = C99_FLAGS,
+    deps = [
+        ":bit_utils",
+        ":cpu_features_macros",
+        ":cpuinfo",
+    ],
+)
diff --git a/WORKSPACE b/WORKSPACE
new file mode 100644
index 0000000..104c459
--- /dev/null
+++ b/WORKSPACE
@@ -0,0 +1,23 @@
+workspace(name = "com_google_cpufeatures")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "com_google_googletest",
+    sha256 = "269cebe2be1f607f91f52630ff5bec3275b948c65d4bac323ebd05e90d84f7a9",
+    strip_prefix = "googletest-e2239ee6043f73722e7aa812a459f54a28552929",
+    urls = ["https://github.com/google/googletest/archive/e2239ee6043f73722e7aa812a459f54a28552929.zip"],
+)
+
+http_archive(
+    name = "bazel_skylib",
+    sha256 = "c6966ec828da198c5d9adbaa94c05e3a1c7f21bd012a0b29ba8ddbccb2c93b0d",
+    urls = [
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.1.1/bazel-skylib-1.1.1.tar.gz",
+        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.1.1/bazel-skylib-1.1.1.tar.gz",
+    ],
+)
+
+load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
+
+bazel_skylib_workspace()
diff --git a/bazel/platforms.bzl b/bazel/platforms.bzl
new file mode 100644
index 0000000..5671add
--- /dev/null
+++ b/bazel/platforms.bzl
@@ -0,0 +1,11 @@
+"""Defines global variables that lists target cpus"""
+
+PLATFORM_CPU_X86_64 = ("@platforms//cpu:x86_64")
+
+PLATFORM_CPU_ARM = ("@platforms//cpu:arm")
+
+PLATFORM_CPU_ARM64 = ("@platforms//cpu:arm64")
+
+PLATFORM_CPU_MIPS = ("@platforms//cpu:mips64")
+
+PLATFORM_CPU_PPC = ("@platforms//cpu:ppc")