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-rw-r--r--absl/flags/internal/flag.cc81
-rw-r--r--absl/flags/internal/flag.h25
-rw-r--r--absl/flags/internal/type_erased_test.cc7
3 files changed, 58 insertions, 55 deletions
diff --git a/absl/flags/internal/flag.cc b/absl/flags/internal/flag.cc
index 83ec8df1..5a921e28 100644
--- a/absl/flags/internal/flag.cc
+++ b/absl/flags/internal/flag.cc
@@ -121,13 +121,21 @@ void FlagImpl::AssertValidType(FlagStaticTypeId type_id) const {
std::unique_ptr<void, DynValueDeleter> FlagImpl::MakeInitValue() const {
void* res = nullptr;
if (DefaultKind() == FlagDefaultKind::kDynamicValue) {
- res = flags_internal::Clone(op_, default_src_.dynamic_value);
+ res = flags_internal::Clone(op_, default_value_.dynamic_value);
} else {
- res = (*default_src_.gen_func)();
+ res = (*default_value_.gen_func)();
}
return {res, DynValueDeleter{op_}};
}
+void FlagImpl::StoreValue(const void* src) {
+ flags_internal::Copy(op_, src, value_.dynamic);
+ StoreAtomic();
+ modified_ = true;
+ ++counter_;
+ InvokeCallback();
+}
+
absl::string_view FlagImpl::Name() const { return name_; }
std::string FlagImpl::Filename() const {
@@ -220,23 +228,19 @@ bool FlagImpl::RestoreState(const void* value, bool modified,
// argument. If parsing successful, this function replaces the dst with newly
// parsed value. In case if any error is encountered in either step, the error
// message is stored in 'err'
-bool FlagImpl::TryParse(void** dst, absl::string_view value,
- std::string* err) const {
- auto tentative_value = MakeInitValue();
+std::unique_ptr<void, DynValueDeleter> FlagImpl::TryParse(
+ absl::string_view value, std::string* err) const {
+ std::unique_ptr<void, DynValueDeleter> tentative_value = MakeInitValue();
std::string parse_err;
if (!flags_internal::Parse(op_, value, tentative_value.get(), &parse_err)) {
absl::string_view err_sep = parse_err.empty() ? "" : "; ";
*err = absl::StrCat("Illegal value '", value, "' specified for flag '",
Name(), "'", err_sep, parse_err);
- return false;
+ return nullptr;
}
- void* old_val = *dst;
- *dst = tentative_value.release();
- tentative_value.reset(old_val);
-
- return true;
+ return tentative_value;
}
void FlagImpl::Read(void* dst) const {
@@ -266,22 +270,17 @@ void FlagImpl::Write(const void* src) {
absl::MutexLock l(DataGuard());
if (ShouldValidateFlagValue(flags_internal::StaticTypeId(op_))) {
- void* obj = flags_internal::Clone(op_, src);
+ std::unique_ptr<void, DynValueDeleter> obj{flags_internal::Clone(op_, src),
+ DynValueDeleter{op_}};
std::string ignored_error;
std::string src_as_str = flags_internal::Unparse(op_, src);
- if (!flags_internal::Parse(op_, src_as_str, obj, &ignored_error)) {
+ if (!flags_internal::Parse(op_, src_as_str, obj.get(), &ignored_error)) {
ABSL_INTERNAL_LOG(ERROR, absl::StrCat("Attempt to set flag '", Name(),
"' to invalid value ", src_as_str));
}
- flags_internal::Delete(op_, obj);
}
- modified_ = true;
- counter_++;
- flags_internal::Copy(op_, src, value_.dynamic);
-
- StoreAtomic();
- InvokeCallback();
+ StoreValue(src);
}
// Sets the value of the flag based on specified string `value`. If the flag
@@ -299,11 +298,10 @@ bool FlagImpl::SetFromString(absl::string_view value, FlagSettingMode set_mode,
switch (set_mode) {
case SET_FLAGS_VALUE: {
// set or modify the flag's value
- if (!TryParse(&value_.dynamic, value, err)) return false;
- modified_ = true;
- counter_++;
- StoreAtomic();
- InvokeCallback();
+ auto tentative_value = TryParse(value, err);
+ if (!tentative_value) return false;
+
+ StoreValue(tentative_value.get());
if (source == kCommandLine) {
on_command_line_ = true;
@@ -312,13 +310,7 @@ bool FlagImpl::SetFromString(absl::string_view value, FlagSettingMode set_mode,
}
case SET_FLAG_IF_DEFAULT: {
// set the flag's value, but only if it hasn't been set by someone else
- if (!modified_) {
- if (!TryParse(&value_.dynamic, value, err)) return false;
- modified_ = true;
- counter_++;
- StoreAtomic();
- InvokeCallback();
- } else {
+ if (modified_) {
// 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.
@@ -327,28 +319,29 @@ bool FlagImpl::SetFromString(absl::string_view value, FlagSettingMode set_mode,
// return false;
return true;
}
+ auto tentative_value = TryParse(value, err);
+ if (!tentative_value) return false;
+
+ StoreValue(tentative_value.get());
break;
}
case SET_FLAGS_DEFAULT: {
+ auto tentative_value = TryParse(value, err);
+ if (!tentative_value) return false;
+
if (DefaultKind() == FlagDefaultKind::kDynamicValue) {
- if (!TryParse(&default_src_.dynamic_value, value, err)) {
- return false;
- }
+ void* old_value = default_value_.dynamic_value;
+ default_value_.dynamic_value = tentative_value.release();
+ tentative_value.reset(old_value);
} else {
- void* new_default_val = nullptr;
- if (!TryParse(&new_default_val, value, err)) {
- return false;
- }
-
- default_src_.dynamic_value = new_default_val;
+ default_value_.dynamic_value = tentative_value.release();
def_kind_ = static_cast<uint8_t>(FlagDefaultKind::kDynamicValue);
}
if (!modified_) {
// Need to set both default value *and* current, in this case
- flags_internal::Copy(op_, default_src_.dynamic_value, value_.dynamic);
- StoreAtomic();
- InvokeCallback();
+ StoreValue(default_value_.dynamic_value);
+ modified_ = false;
}
break;
}
diff --git a/absl/flags/internal/flag.h b/absl/flags/internal/flag.h
index ec673487..c1beda8e 100644
--- a/absl/flags/internal/flag.h
+++ b/absl/flags/internal/flag.h
@@ -363,7 +363,7 @@ struct DynValueDeleter {
if (op != nullptr) Delete(op, ptr);
}
- const FlagOpFn op;
+ FlagOpFn op;
};
class FlagImpl {
@@ -380,7 +380,7 @@ class FlagImpl {
on_command_line_(false),
counter_(0),
callback_(nullptr),
- default_src_(default_value_gen),
+ default_value_(default_value_gen),
data_guard_{} {}
// Constant access methods
@@ -392,10 +392,6 @@ class FlagImpl {
std::string DefaultValue() const ABSL_LOCKS_EXCLUDED(*DataGuard());
std::string CurrentValue() const ABSL_LOCKS_EXCLUDED(*DataGuard());
void Read(void* dst) const ABSL_LOCKS_EXCLUDED(*DataGuard());
- // Attempts to parse supplied `value` std::string. If parsing is successful, then
- // it replaces `dst` with the new value.
- bool TryParse(void** dst, absl::string_view value, std::string* err) const
- ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
template <typename T, typename std::enable_if<
!IsAtomicFlagTypeTrait<T>::value, int>::type = 0>
@@ -466,8 +462,15 @@ class FlagImpl {
// Returns heap allocated value of type T initialized with default value.
std::unique_ptr<void, DynValueDeleter> MakeInitValue() const
ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
- // Lazy initialization of the Flag's data.
+ // Flag initialization called via absl::call_once.
void Init();
+ // Attempts to parse supplied `value` std::string. If parsing is successful,
+ // returns new value. Otherwsie returns nullptr.
+ std::unique_ptr<void, DynValueDeleter> TryParse(absl::string_view value,
+ std::string* err) const
+ ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
+ // Stores the flag value based on the pointer to the source.
+ void StoreValue(const void* src) ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
FlagHelpKind HelpSourceKind() const {
return static_cast<FlagHelpKind>(help_source_kind_);
@@ -511,7 +514,7 @@ class FlagImpl {
// Mutable flag's state (guarded by `data_guard_`).
- // If def_kind_ == kDynamicValue, default_src_ holds a dynamically allocated
+ // If def_kind_ == kDynamicValue, default_value_ holds a dynamically allocated
// value.
uint8_t def_kind_ : 1 ABSL_GUARDED_BY(*DataGuard());
// Has this flag's value been modified?
@@ -527,7 +530,7 @@ class FlagImpl {
// value specified in ABSL_FLAG or pointer to the dynamically set default
// value via SetCommandLineOptionWithMode. def_kind_ is used to distinguish
// these two cases.
- FlagDefaultSrc default_src_ ABSL_GUARDED_BY(*DataGuard());
+ FlagDefaultSrc default_value_ ABSL_GUARDED_BY(*DataGuard());
// Current Flag Value
FlagValue value_;
@@ -542,8 +545,8 @@ class FlagImpl {
};
///////////////////////////////////////////////////////////////////////////////
-// The "unspecified" implementation of Flag object parameterized by the
-// flag's value type.
+// The Flag object parameterized by the flag's value type. This class implements
+// flag reflection handle interface.
template <typename T>
class Flag final : public flags_internal::CommandLineFlag {
diff --git a/absl/flags/internal/type_erased_test.cc b/absl/flags/internal/type_erased_test.cc
index 033e00e4..4ce59810 100644
--- a/absl/flags/internal/type_erased_test.cc
+++ b/absl/flags/internal/type_erased_test.cc
@@ -119,6 +119,13 @@ TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAGS_DEFAULT) {
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
flags::SET_FLAGS_DEFAULT));
+ // Set it again to ensure that resetting logic is covered.
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "102",
+ flags::SET_FLAGS_DEFAULT));
+
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "103",
+ flags::SET_FLAGS_DEFAULT));
+
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
flags::SET_FLAGS_DEFAULT));
EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 08:48:49 +0000