Export of internal Abseil changes

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daa829a331a2316713681b5fe7630d1951e0fdec by Gennadiy Rozental <rogeeff@google.com>:

Eliminate Flag's destroy method.

The Abseil Flags are never destroyed. The only place where Destroy method was invoked was in some obscure place during flag registration, where we faces with duplicate retired flag registration. Regired Flag destruction is empty anyway. so we can just delete the duplicate object. The FLagImpl::Destroy is never invoked.

PiperOrigin-RevId: 294472413

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3c159499ccde8ccdd6907b3a1ddb26be7d3f016f by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 294401573

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25910db425c50d9b9a8f8275af5a67c2935934fd by Shahriar Rouf <nafi@google.com>:

Optimize absl::string_view::compare.

Motivation: https://godbolt.org/z/Uz8DWV
PiperOrigin-RevId: 294286196
GitOrigin-RevId: daa829a331a2316713681b5fe7630d1951e0fdec
Change-Id: I818dad27ac5eb61bb7632e01224953cd882803bf

1 files changed, 9 insertions, 12 deletions

diff --git a/absl/flags/internal/registry.cc b/absl/flags/internal/registry.cc
index 7889b1f3403f..2ef16e84864c 100644
--- a/absl/flags/internal/registry.cc
+++ b/absl/flags/internal/registry.cc
@@ -57,11 +57,7 @@ namespace flags_internal {
 class FlagRegistry {
  public:
   FlagRegistry() = default;
-  ~FlagRegistry() {
-    for (auto& p : flags_) {
-      p.second->Destroy();
-    }
-  }
+  ~FlagRegistry() = default;
 
   // Store a flag in this registry.  Takes ownership of *flag.
   void RegisterFlag(CommandLineFlag* flag);
@@ -113,6 +109,7 @@ class FlagRegistryLock {
   FlagRegistry* const fr_;
 };
 
+void DestroyRetiredFlag(CommandLineFlag* flag);
 }  // namespace
 
 void FlagRegistry::RegisterFlag(CommandLineFlag* flag) {
@@ -140,8 +137,8 @@ void FlagRegistry::RegisterFlag(CommandLineFlag* flag) {
                        flag->Typename(), "', respectively."),
           true);
     } else if (old_flag->IsRetired()) {
-      // Retired definitions are idempotent. Just keep the old one.
-      flag->Destroy();
+      // Retired flag can just be deleted.
+      DestroyRetiredFlag(flag);
       return;
     } else if (old_flag->Filename() != flag->Filename()) {
       flags_internal::ReportUsageError(
@@ -291,11 +288,6 @@ class RetiredFlagObj final : public flags_internal::CommandLineFlag {
       : name_(name), op_(ops) {}
 
  private:
-  void Destroy() override {
-    // Values are heap allocated for Retired Flags.
-    delete this;
-  }
-
   absl::string_view Name() const override { return name_; }
   std::string Filename() const override { return "RETIRED"; }
   absl::string_view Typename() const override { return ""; }
@@ -328,6 +320,11 @@ class RetiredFlagObj final : public flags_internal::CommandLineFlag {
   const FlagOpFn op_;
 };
 
+void DestroyRetiredFlag(flags_internal::CommandLineFlag* flag) {
+  assert(flag->IsRetired());
+  delete static_cast<RetiredFlagObj*>(flag);
+}
+
 }  // namespace
 
 bool Retire(const char* name, FlagOpFn ops) {