Add configurability of the log Tag value on Android

PiperOrigin-RevId: 525178448
Change-Id: I0f35a38f23316b25621148b7fe59becf72bafeff

1 files changed, 29 insertions, 3 deletions

diff --git a/absl/log/globals.cc b/absl/log/globals.cc
index f7c2ec42..cc85438f 100644
--- a/absl/log/globals.cc
+++ b/absl/log/globals.cc
@@ -14,14 +14,17 @@
 
 #include "absl/log/globals.h"
 
-#include <stddef.h>
-#include <stdint.h>
-
 #include <atomic>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <string>
 
 #include "absl/base/attributes.h"
 #include "absl/base/config.h"
 #include "absl/base/internal/atomic_hook.h"
+#include "absl/base/internal/raw_logging.h"
 #include "absl/base/log_severity.h"
 #include "absl/hash/hash.h"
 #include "absl/strings/string_view.h"
@@ -43,6 +46,9 @@ ABSL_CONST_INIT std::atomic<int> stderrthreshold{
 ABSL_CONST_INIT std::atomic<size_t> log_backtrace_at_hash{0};
 ABSL_CONST_INIT std::atomic<bool> prepend_log_prefix{true};
 
+constexpr char kDefaultAndroidTag[] = "native";
+ABSL_CONST_INIT std::atomic<const char*> android_log_tag{kDefaultAndroidTag};
+
 ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
 absl::base_internal::AtomicHook<log_internal::LoggingGlobalsListener>
     logging_globals_listener;
@@ -121,6 +127,26 @@ ScopedStderrThreshold::~ScopedStderrThreshold() {
 
 namespace log_internal {
 
+const char* GetAndroidNativeTag() {
+  return android_log_tag.load(std::memory_order_acquire);
+}
+
+}  // namespace log_internal
+
+void SetAndroidNativeTag(const char* tag) {
+  ABSL_CONST_INIT static std::atomic<const std::string*> user_log_tag(nullptr);
+  ABSL_INTERNAL_CHECK(tag, "tag must be non-null.");
+
+  const std::string* tag_str = new std::string(tag);
+  ABSL_INTERNAL_CHECK(
+      android_log_tag.exchange(tag_str->c_str(), std::memory_order_acq_rel) ==
+          kDefaultAndroidTag,
+      "SetAndroidNativeTag() must only be called once per process!");
+  user_log_tag.store(tag_str, std::memory_order_relaxed);
+}
+
+namespace log_internal {
+
 bool ShouldLogBacktraceAt(absl::string_view file, int line) {
   const size_t flag_hash =
       log_backtrace_at_hash.load(std::memory_order_relaxed);