diff options
Diffstat (limited to 'absl/flags/internal/commandlineflag.cc')
| -rw-r--r-- | absl/flags/internal/commandlineflag.cc | 333 |
1 files changed, 0 insertions, 333 deletions
diff --git a/absl/flags/internal/commandlineflag.cc b/absl/flags/internal/commandlineflag.cc index 99f73611d8f1..caf33bc4892b 100644 --- a/absl/flags/internal/commandlineflag.cc +++ b/absl/flags/internal/commandlineflag.cc @@ -15,14 +15,7 @@ #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 { namespace flags_internal { @@ -35,80 +28,6 @@ namespace flags_internal { // 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->IsRetired() && 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 - ABSL_LOCK_RETURNED(locks_->primary_mu) { - if (!inited_.load(std::memory_order_acquire)) { - return InitFlag(const_cast<CommandLineFlag*>(this)); - } - - // All fields initialized; locks_ is therefore safe to read. - return &locks_->primary_mu; -} - -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 @@ -137,223 +56,6 @@ std::string CommandLineFlag::Filename() const { return flags_internal::GetUsageConfig().normalize_filename(filename_); } -std::string CommandLineFlag::DefaultValue() const { - absl::MutexLock l(InitFlagIfNecessary()); - - return Unparse(marshalling_op_, def_); -} - -std::string CommandLineFlag::CurrentValue() const { - absl::MutexLock l(InitFlagIfNecessary()); - - return Unparse(marshalling_op_, cur_); -} - -int64_t CommandLineFlag::MutationCounter() const { - absl::MutexLock l(InitFlagIfNecessary()); - - return counter_; -} - -// 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) - ABSL_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 (!modified_ && ChangedDirectly(this, cur_, def_)) { - modified_ = true; - } - } - - switch (set_mode) { - case SET_FLAGS_VALUE: { - // set or modify the flag's value - if (!TryParseLocked(this, cur_, value, err)) return false; - modified_ = true; - UpdateCopy(this); - InvokeCallback(); - - if (source == kCommandLine) { - 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 (!modified_) { - if (!TryParseLocked(this, cur_, value, err)) return false; - 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(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, def_, value, err)) return false; - - if (!modified_) { - // Need to set both defvalue *and* current, in this case - Copy(op_, def_, cur_); - UpdateCopy(this); - InvokeCallback(); - } - break; - } - default: { - // unknown set_mode - assert(false); - return false; - } - } - - return true; -} - -void CommandLineFlag::CheckDefaultValueParsingRoundtrip() const { - std::string v = DefaultValue(); - - absl::MutexLock lock(InitFlagIfNecessary()); - - void* dst = Clone(op_, def_); - std::string error; - if (!flags_internal::Parse(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(op_, dst); -} - -bool CommandLineFlag::ValidateDefaultValue() const { - absl::MutexLock lock(InitFlagIfNecessary()); - return InvokeValidator(def_); -} - -bool CommandLineFlag::ValidateInputValue(absl::string_view value) const { - absl::MutexLock l(InitFlagIfNecessary()); // protect default value access - - void* obj = Clone(op_, def_); - std::string ignored_error; - const bool result = - flags_internal::Parse(marshalling_op_, value, obj, &ignored_error) && - InvokeValidator(obj); - Delete(op_, obj); - return result; -} - -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_; @@ -361,40 +63,5 @@ std::string HelpText::GetHelpText() const { 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(); \ - } - - 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 } // namespace absl |