Creation of LTS branch "lts_2020_02_25"20200225

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GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421
Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7

1 files changed, 0 insertions, 496 deletions

diff --git a/absl/flags/internal/commandlineflag.cc b/absl/flags/internal/commandlineflag.cc
deleted file mode 100644
index f964165e..00000000
--- a/absl/flags/internal/commandlineflag.cc
+++ /dev/null
@@ -1,496 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// 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
-//
-//      https://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.
-
-#include "absl/flags/internal/commandlineflag.h"
-
-#include <cassert>
-
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/optimization.h"
-#include "absl/flags/config.h"
-#include "absl/flags/usage_config.h"
-#include "absl/strings/str_cat.h"
-#include "absl/synchronization/mutex.h"
-
-namespace absl {
-inline namespace lts_2019_08_08 {
-namespace flags_internal {
-
-// The help message indicating that the commandline flag has been
-// 'stripped'. It will not show up when doing "-help" and its
-// variants. The flag is stripped if ABSL_FLAGS_STRIP_HELP is set to 1
-// before including absl/flags/flag.h
-
-// This is used by this file, and also in commandlineflags_reporting.cc
-const char kStrippedFlagHelp[] = "\001\002\003\004 (unknown) \004\003\002\001";
-
-namespace {
-
-// Currently we only validate flag values for user-defined flag types.
-bool ShouldValidateFlagValue(const CommandLineFlag& flag) {
-#define DONT_VALIDATE(T) \
-  if (flag.IsOfType<T>()) return false;
-  ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(DONT_VALIDATE)
-  DONT_VALIDATE(std::string)
-  DONT_VALIDATE(std::vector<std::string>)
-#undef DONT_VALIDATE
-
-  return true;
-}
-
-}  // namespace
-
-absl::Mutex* InitFlag(CommandLineFlag* flag) {
-  ABSL_CONST_INIT static absl::Mutex init_lock(absl::kConstInit);
-  absl::Mutex* mu;
-
-  {
-    absl::MutexLock lock(&init_lock);
-
-    if (flag->locks == nullptr) {  // Must initialize Mutexes for this flag.
-      flag->locks = new flags_internal::CommandLineFlagLocks;
-    }
-
-    mu = &flag->locks->primary_mu;
-  }
-
-  {
-    absl::MutexLock lock(mu);
-
-    if (!flag->retired && flag->def == nullptr) {
-      // Need to initialize def and cur fields.
-      flag->def = (*flag->make_init_value)();
-      flag->cur = Clone(flag->op, flag->def);
-      UpdateCopy(flag);
-      flag->inited.store(true, std::memory_order_release);
-      flag->InvokeCallback();
-    }
-  }
-
-  flag->inited.store(true, std::memory_order_release);
-  return mu;
-}
-
-// Ensure that the lazily initialized fields of *flag have been initialized,
-// and return &flag->locks->primary_mu.
-absl::Mutex* CommandLineFlag::InitFlagIfNecessary() const
-    LOCK_RETURNED(locks->primary_mu) {
-  if (!this->inited.load(std::memory_order_acquire)) {
-    return InitFlag(const_cast<CommandLineFlag*>(this));
-  }
-
-  // All fields initialized; this->locks is therefore safe to read.
-  return &this->locks->primary_mu;
-}
-
-void CommandLineFlag::Destroy() const {
-  // Values are heap allocated for retired and Abseil Flags.
-  if (IsRetired() || IsAbseilFlag()) {
-    if (this->cur) Delete(this->op, this->cur);
-    if (this->def) Delete(this->op, this->def);
-  }
-
-  delete this->locks;
-}
-
-bool CommandLineFlag::IsModified() const {
-  absl::MutexLock l(InitFlagIfNecessary());
-  return modified;
-}
-
-void CommandLineFlag::SetModified(bool is_modified) {
-  absl::MutexLock l(InitFlagIfNecessary());
-  modified = is_modified;
-}
-
-bool CommandLineFlag::IsSpecifiedOnCommandLine() const {
-  absl::MutexLock l(InitFlagIfNecessary());
-  return on_command_line;
-}
-
-absl::string_view CommandLineFlag::Typename() const {
-  // We do not store/report type in Abseil Flags, so that user do not rely on in
-  // at runtime
-  if (IsAbseilFlag() || IsRetired()) return "";
-
-#define HANDLE_V1_BUILTIN_TYPE(t) \
-  if (IsOfType<t>()) {            \
-    return #t;                    \
-  }
-
-  HANDLE_V1_BUILTIN_TYPE(bool);
-  HANDLE_V1_BUILTIN_TYPE(int32_t);
-  HANDLE_V1_BUILTIN_TYPE(int64_t);
-  HANDLE_V1_BUILTIN_TYPE(uint64_t);
-  HANDLE_V1_BUILTIN_TYPE(double);
-#undef HANDLE_V1_BUILTIN_TYPE
-
-  if (IsOfType<std::string>()) {
-    return "string";
-  }
-
-  return "";
-}
-
-std::string CommandLineFlag::Filename() const {
-  return flags_internal::GetUsageConfig().normalize_filename(this->filename);
-}
-
-std::string CommandLineFlag::DefaultValue() const {
-  absl::MutexLock l(InitFlagIfNecessary());
-
-  return Unparse(this->marshalling_op, this->def);
-}
-
-std::string CommandLineFlag::CurrentValue() const {
-  absl::MutexLock l(InitFlagIfNecessary());
-
-  return Unparse(this->marshalling_op, this->cur);
-}
-
-bool CommandLineFlag::HasValidatorFn() const {
-  absl::MutexLock l(InitFlagIfNecessary());
-
-  return this->validator != nullptr;
-}
-
-bool CommandLineFlag::SetValidatorFn(FlagValidator fn) {
-  absl::MutexLock l(InitFlagIfNecessary());
-
-  // ok to register the same function over and over again
-  if (fn == this->validator) return true;
-
-  // Can't set validator to a different function, unless reset first.
-  if (fn != nullptr && this->validator != nullptr) {
-    ABSL_INTERNAL_LOG(
-        WARNING, absl::StrCat("Ignoring SetValidatorFn() for flag '", Name(),
-                              "': validate-fn already registered"));
-
-    return false;
-  }
-
-  this->validator = fn;
-  return true;
-}
-
-bool CommandLineFlag::InvokeValidator(const void* value) const
-    EXCLUSIVE_LOCKS_REQUIRED(this->locks->primary_mu) {
-  if (!this->validator) {
-    return true;
-  }
-
-  (void)value;
-
-  ABSL_INTERNAL_LOG(
-      FATAL,
-      absl::StrCat("Flag '", Name(),
-                   "' of encapsulated type should not have a validator"));
-
-  return false;
-}
-
-void CommandLineFlag::SetCallback(
-    const flags_internal::FlagCallback mutation_callback) {
-  absl::MutexLock l(InitFlagIfNecessary());
-
-  callback = mutation_callback;
-
-  InvokeCallback();
-}
-
-// If the flag has a mutation callback this function invokes it. While the
-// callback is being invoked the primary flag's mutex is unlocked and it is
-// re-locked back after call to callback is completed. Callback invocation is
-// guarded by flag's secondary mutex instead which prevents concurrent callback
-// invocation. Note that it is possible for other thread to grab the primary
-// lock and update flag's value at any time during the callback invocation.
-// This is by design. Callback can get a value of the flag if necessary, but it
-// might be different from the value initiated the callback and it also can be
-// different by the time the callback invocation is completed.
-// Requires that *primary_lock be held in exclusive mode; it may be released
-// and reacquired by the implementation.
-void CommandLineFlag::InvokeCallback()
-    EXCLUSIVE_LOCKS_REQUIRED(this->locks->primary_mu) {
-  if (!this->callback) return;
-
-  // The callback lock is guaranteed initialized, because *locks->primary_mu
-  // exists.
-  absl::Mutex* callback_mu = &this->locks->callback_mu;
-
-  // When executing the callback we need the primary flag's mutex to be unlocked
-  // so that callback can retrieve the flag's value.
-  this->locks->primary_mu.Unlock();
-
-  {
-    absl::MutexLock lock(callback_mu);
-    this->callback();
-  }
-
-  this->locks->primary_mu.Lock();
-}
-
-// Attempts to parse supplied `value` string using parsing routine in the `flag`
-// argument. If parsing is successful, it will try to validate that the parsed
-// value is valid for the specified 'flag'. Finally this function stores the
-// parsed value in 'dst' assuming it is a pointer to the flag's value type. In
-// case if any error is encountered in either step, the error message is stored
-// in 'err'
-bool TryParseLocked(CommandLineFlag* flag, void* dst, absl::string_view value,
-                    std::string* err)
-    EXCLUSIVE_LOCKS_REQUIRED(flag->locks->primary_mu) {
-  void* tentative_value = Clone(flag->op, flag->def);
-  std::string parse_err;
-  if (!Parse(flag->marshalling_op, value, tentative_value, &parse_err)) {
-    auto type_name = flag->Typename();
-    absl::string_view err_sep = parse_err.empty() ? "" : "; ";
-    absl::string_view typename_sep = type_name.empty() ? "" : " ";
-    *err = absl::StrCat("Illegal value '", value, "' specified for",
-                        typename_sep, type_name, " flag '", flag->Name(), "'",
-                        err_sep, parse_err);
-    Delete(flag->op, tentative_value);
-    return false;
-  }
-
-  if (!flag->InvokeValidator(tentative_value)) {
-    *err = absl::StrCat("Failed validation of new value '",
-                        Unparse(flag->marshalling_op, tentative_value),
-                        "' for flag '", flag->Name(), "'");
-    Delete(flag->op, tentative_value);
-    return false;
-  }
-
-  flag->counter++;
-  Copy(flag->op, tentative_value, dst);
-  Delete(flag->op, tentative_value);
-  return true;
-}
-
-// Sets the value of the flag based on specified string `value`. If the flag
-// was successfully set to new value, it returns true. Otherwise, sets `err`
-// to indicate the error, leaves the flag unchanged, and returns false. There
-// are three ways to set the flag's value:
-//  * Update the current flag value
-//  * Update the flag's default value
-//  * Update the current flag value if it was never set before
-// The mode is selected based on 'set_mode' parameter.
-bool CommandLineFlag::SetFromString(absl::string_view value,
-                                    FlagSettingMode set_mode,
-                                    ValueSource source, std::string* err) {
-  if (IsRetired()) return false;
-
-  absl::MutexLock l(InitFlagIfNecessary());
-
-  // Direct-access flags can be modified without going through the
-  // flag API. Detect such changes and update the flag->modified bit.
-  if (!IsAbseilFlag()) {
-    if (!this->modified && ChangedDirectly(this, this->cur, this->def)) {
-      this->modified = true;
-    }
-  }
-
-  switch (set_mode) {
-    case SET_FLAGS_VALUE: {
-      // set or modify the flag's value
-      if (!TryParseLocked(this, this->cur, value, err)) return false;
-      this->modified = true;
-      UpdateCopy(this);
-      InvokeCallback();
-
-      if (source == kCommandLine) {
-        this->on_command_line = true;
-      }
-      break;
-    }
-    case SET_FLAG_IF_DEFAULT: {
-      // set the flag's value, but only if it hasn't been set by someone else
-      if (!this->modified) {
-        if (!TryParseLocked(this, this->cur, value, err)) return false;
-        this->modified = true;
-        UpdateCopy(this);
-        InvokeCallback();
-      } else {
-        // TODO(rogeeff): review and fix this semantic. Currently we do not fail
-        // in this case if flag is modified. This is misleading since the flag's
-        // value is not updated even though we return true.
-        // *err = absl::StrCat(this->Name(), " is already set to ",
-        //                     CurrentValue(), "\n");
-        // return false;
-        return true;
-      }
-      break;
-    }
-    case SET_FLAGS_DEFAULT: {
-      // modify the flag's default-value
-      if (!TryParseLocked(this, this->def, value, err)) return false;
-
-      if (!this->modified) {
-        // Need to set both defvalue *and* current, in this case
-        Copy(this->op, this->def, this->cur);
-        UpdateCopy(this);
-        InvokeCallback();
-      }
-      break;
-    }
-    default: {
-      // unknown set_mode
-      assert(false);
-      return false;
-    }
-  }
-
-  return true;
-}
-
-void CommandLineFlag::StoreAtomic(size_t size) {
-  int64_t t = 0;
-  assert(size <= sizeof(int64_t));
-  memcpy(&t, this->cur, size);
-  this->atomic.store(t, std::memory_order_release);
-}
-
-void CommandLineFlag::CheckDefaultValueParsingRoundtrip() const {
-  std::string v = DefaultValue();
-
-  absl::MutexLock lock(InitFlagIfNecessary());
-
-  void* dst = Clone(this->op, this->def);
-  std::string error;
-  if (!flags_internal::Parse(this->marshalling_op, v, dst, &error)) {
-    ABSL_INTERNAL_LOG(
-        FATAL,
-        absl::StrCat("Flag ", Name(), " (from ", Filename(),
-                     "): std::string form of default value '", v,
-                     "' could not be parsed; error=", error));
-  }
-
-  // We do not compare dst to def since parsing/unparsing may make
-  // small changes, e.g., precision loss for floating point types.
-  Delete(this->op, dst);
-}
-
-bool CommandLineFlag::ValidateDefaultValue() const {
-  absl::MutexLock lock(InitFlagIfNecessary());
-  return InvokeValidator(this->def);
-}
-
-bool CommandLineFlag::ValidateInputValue(absl::string_view value) const {
-  absl::MutexLock l(InitFlagIfNecessary());  // protect default value access
-
-  void* obj = Clone(this->op, this->def);
-  std::string ignored_error;
-  const bool result =
-      flags_internal::Parse(this->marshalling_op, value, obj, &ignored_error) &&
-      InvokeValidator(obj);
-  Delete(this->op, obj);
-  return result;
-}
-
-const int64_t CommandLineFlag::kAtomicInit;
-
-void CommandLineFlag::Read(void* dst,
-                           const flags_internal::FlagOpFn dst_op) const {
-  absl::ReaderMutexLock l(InitFlagIfNecessary());
-
-  // `dst_op` is the unmarshaling operation corresponding to the declaration
-  // visibile at the call site. `op` is the Flag's defined unmarshalling
-  // operation. They must match for this operation to be well-defined.
-  if (ABSL_PREDICT_FALSE(dst_op != op)) {
-    ABSL_INTERNAL_LOG(
-        ERROR,
-        absl::StrCat("Flag '", name,
-                     "' is defined as one type and declared as another"));
-  }
-  CopyConstruct(op, cur, dst);
-}
-
-void CommandLineFlag::Write(const void* src,
-                            const flags_internal::FlagOpFn src_op) {
-  absl::MutexLock l(InitFlagIfNecessary());
-
-  // `src_op` is the marshalling operation corresponding to the declaration
-  // visible at the call site. `op` is the Flag's defined marshalling operation.
-  // They must match for this operation to be well-defined.
-  if (ABSL_PREDICT_FALSE(src_op != op)) {
-    ABSL_INTERNAL_LOG(
-        ERROR,
-        absl::StrCat("Flag '", name,
-                     "' is defined as one type and declared as another"));
-  }
-
-  if (ShouldValidateFlagValue(*this)) {
-    void* obj = Clone(op, src);
-    std::string ignored_error;
-    std::string src_as_str = Unparse(marshalling_op, src);
-    if (!Parse(marshalling_op, src_as_str, obj, &ignored_error) ||
-        !InvokeValidator(obj)) {
-      ABSL_INTERNAL_LOG(ERROR, absl::StrCat("Attempt to set flag '", name,
-                                            "' to invalid value ", src_as_str));
-    }
-    Delete(op, obj);
-  }
-
-  modified = true;
-  counter++;
-  Copy(op, src, cur);
-
-  UpdateCopy(this);
-  InvokeCallback();
-}
-
-std::string HelpText::GetHelpText() const {
-  if (help_function_) return help_function_();
-  if (help_message_) return help_message_;
-
-  return {};
-}
-
-// Update any copy of the flag value that is stored in an atomic word.
-// In addition if flag has a mutation callback this function invokes it.
-void UpdateCopy(CommandLineFlag* flag) {
-#define STORE_ATOMIC(T)           \
-  else if (flag->IsOfType<T>()) { \
-    flag->StoreAtomic(sizeof(T)); \
-  }
-
-  if (false) {
-  }
-  ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(STORE_ATOMIC)
-#undef STORE_ATOMIC
-}
-
-// Return true iff flag value was changed via direct-access.
-bool ChangedDirectly(CommandLineFlag* flag, const void* a, const void* b) {
-  if (!flag->IsAbseilFlag()) {
-// Need to compare values for direct-access flags.
-#define CHANGED_FOR_TYPE(T)                                                  \
-  if (flag->IsOfType<T>()) {                                                 \
-    return *reinterpret_cast<const T*>(a) != *reinterpret_cast<const T*>(b); \
-  }
-
-    CHANGED_FOR_TYPE(bool);
-    CHANGED_FOR_TYPE(int32_t);
-    CHANGED_FOR_TYPE(int64_t);
-    CHANGED_FOR_TYPE(uint64_t);
-    CHANGED_FOR_TYPE(double);
-    CHANGED_FOR_TYPE(std::string);
-#undef CHANGED_FOR_TYPE
-  }
-
-  return false;
-}
-
-}  // namespace flags_internal
-}  // inline namespace lts_2019_08_08
-}  // namespace absl