Add Starboard version of CPUSupportsRandenHwAes

third_party/abseil-cpp/absl/random/internal/BUILD.gn

@@ -224,6 +224,11 @@ absl_source_set("randen_hwaes") {
     ":randen_hwaes_impl",
     "//third_party/abseil-cpp/absl/base:config",
   ]
+  if (is_starboard) {
+    sources -= [ "randen_detect.cc" ]
+    sources += [ "randen_detect_starboard.cc" ]
+    deps += [ "//starboard:starboard_headers_only" ]
+  }
   visibility = ["//third_party/abseil-cpp/absl/random/*"]
 }
 

third_party/abseil-cpp/absl/random/internal/randen_detect_starboard.cc

@@ -0,0 +1,55 @@
+// Copyright 2024 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
+// symbols from arbitrary system and other headers, since it may be built
+// with different flags from other targets, using different levels of
+// optimization, potentially introducing ODR violations.
+
+#include "absl/random/internal/randen_detect.h"
+
+#include <cstdint>
+#include <cstring>
+
+#include "absl/random/internal/platform.h"
+#include "starboard/cpu_features.h"
+
+#if !defined(STARBOARD)
+#error This file is a specialization for Starboard only.
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+bool CPUSupportsRandenHwAes() {
+  SbCPUFeatures features;
+  bool result = SbCPUFeaturesGet(&features);
+  if (!result) {
+    return false;
+  }
+  if (features.architecture == kSbCPUFeaturesArchitectureArm ||
+      features.architecture == kSbCPUFeaturesArchitectureArm64) {
+    return features.arm.has_neon && features.arm.has_aes;
+  }
+  if (features.architecture == kSbCPUFeaturesArchitectureX86 ||
+      features.architecture == kSbCPUFeaturesArchitectureX86_64) {
+    return features.x86.has_aesni;
+  }
+  return false;
+}
+
+}  // namespace random_internal
+ABSL_NAMESPACE_END
+}  // namespace absl