Merge tag 'v0.20.7'

release v0.20.7

src/AudioFormat.cxx

@@ -24,7 +24,7 @@
 #include <stdio.h>
 
 void
-AudioFormat::ApplyMask(AudioFormat mask)
+AudioFormat::ApplyMask(AudioFormat mask) noexcept
 {
 	assert(IsValid());
 	assert(mask.IsMaskValid());
@@ -42,7 +42,7 @@ AudioFormat::ApplyMask(AudioFormat mask)
 }
 
 StringBuffer<24>
-ToString(const AudioFormat af)
+ToString(const AudioFormat af) noexcept
 {
 	StringBuffer<24> buffer;
 

src/AudioFormat.hxx

@@ -124,7 +124,7 @@ struct AudioFormat {
 		return !(*this == other);
 	}
 
-	void ApplyMask(AudioFormat mask);
+	void ApplyMask(AudioFormat mask) noexcept;
 
 	gcc_pure
 	AudioFormat WithMask(AudioFormat mask) const {
@@ -223,6 +223,6 @@ AudioFormat::GetTimeToSize() const
  */
 gcc_const
 StringBuffer<24>
-ToString(AudioFormat af);
+ToString(AudioFormat af) noexcept;
 
 #endif

src/AudioParser.hxx

@@ -25,8 +25,6 @@
 #ifndef MPD_AUDIO_PARSER_HXX
 #define MPD_AUDIO_PARSER_HXX
 
-#include "Compiler.h"
-
 struct AudioFormat;
 
 /**
@@ -38,7 +36,6 @@ struct AudioFormat;
  * @param src the input string
  * @param mask if true, then "*" is allowed for any number of items
  */
-gcc_pure
 AudioFormat
 ParseAudioFormat(const char *src, bool mask);
 

src/DetachedSong.cxx

@@ -45,19 +45,19 @@ DetachedSong::operator LightSong() const
 }
 
 bool
-DetachedSong::IsRemote() const
+DetachedSong::IsRemote() const noexcept
 {
 	return uri_has_scheme(GetRealURI());
 }
 
 bool
-DetachedSong::IsAbsoluteFile() const
+DetachedSong::IsAbsoluteFile() const noexcept
 {
 	return PathTraitsUTF8::IsAbsolute(GetRealURI());
 }
 
 bool
-DetachedSong::IsInDatabase() const
+DetachedSong::IsInDatabase() const noexcept
 {
 	/* here, we use GetURI() and not GetRealURI() because
 	   GetRealURI() is never relative */
@@ -67,7 +67,7 @@ DetachedSong::IsInDatabase() const
 }
 
 SignedSongTime
-DetachedSong::GetDuration() const
+DetachedSong::GetDuration() const noexcept
 {
 	SongTime a = start_time, b = end_time;
 	if (!b.IsPositive()) {

src/DetachedSong.hxx

@@ -111,7 +111,7 @@ public:
 	explicit operator LightSong() const;
 
 	gcc_pure
-	const char *GetURI() const {
+	const char *GetURI() const noexcept {
 		return uri.c_str();
 	}
 
@@ -125,7 +125,7 @@ public:
 	 * displayed URI?
 	 */
 	gcc_pure
-	bool HasRealURI() const {
+	bool HasRealURI() const noexcept {
 		return !real_uri.empty();
 	}
 
@@ -134,7 +134,7 @@ public:
 	 * GetURI().
 	 */
 	gcc_pure
-	const char *GetRealURI() const {
+	const char *GetRealURI() const noexcept {
 		return (HasRealURI() ? real_uri : uri).c_str();
 	}
 
@@ -148,19 +148,19 @@ public:
 	 * song.
 	 */
 	gcc_pure
-	bool IsSame(const DetachedSong &other) const {
+	bool IsSame(const DetachedSong &other) const noexcept {
 		return uri == other.uri &&
 			start_time == other.start_time &&
 			end_time == other.end_time;
 	}
 
 	gcc_pure gcc_nonnull_all
-	bool IsURI(const char *other_uri) const {
+	bool IsURI(const char *other_uri) const noexcept {
 		return uri == other_uri;
 	}
 
 	gcc_pure
-	bool IsRemote() const;
+	bool IsRemote() const noexcept;
 
 	gcc_pure
 	bool IsFile() const {
@@ -168,10 +168,10 @@ public:
 	}
 
 	gcc_pure
-	bool IsAbsoluteFile() const;
+	bool IsAbsoluteFile() const noexcept;
 
 	gcc_pure
-	bool IsInDatabase() const;
+	bool IsInDatabase() const noexcept;
 
 	const Tag &GetTag() const {
 		return tag;
@@ -226,7 +226,7 @@ public:
 	}
 
 	gcc_pure
-	SignedSongTime GetDuration() const;
+	SignedSongTime GetDuration() const noexcept;
 
 	/**
 	 * Update the #tag and #mtime.

src/IdleFlags.cxx

@@ -47,13 +47,13 @@ static const char *const idle_names[] = {
 };
 
 const char*const*
-idle_get_names(void)
+idle_get_names() noexcept
 {
         return idle_names;
 }
 
 unsigned
-idle_parse_name(const char *name)
+idle_parse_name(const char *name) noexcept
 {
 #if !CLANG_CHECK_VERSION(3,6)
 	/* disabled on clang due to -Wtautological-pointer-compare */

src/IdleFlags.hxx

@@ -73,8 +73,9 @@ static constexpr unsigned IDLE_PARTITION = 0x2000;
 /**
  * Get idle names
  */
+gcc_const
 const char*const*
-idle_get_names();
+idle_get_names() noexcept;
 
 /**
  * Parse an idle name and return its mask.  Returns 0 if the given
@@ -82,6 +83,6 @@ idle_get_names();
  */
 gcc_nonnull_all gcc_pure
 unsigned
-idle_parse_name(const char *name);
+idle_parse_name(const char *name) noexcept;
 
 #endif

src/Instance.hxx

@@ -128,7 +128,6 @@ struct Instance final
 	 * DatabaseError if this MPD configuration has no database (no
 	 * music_directory was configured).
 	 */
-	gcc_pure
 	const Database &GetDatabaseOrThrow() const;
 #endif
 

src/Main.cxx

@@ -116,7 +116,13 @@
 
 #include <limits.h>
 
-static constexpr unsigned DEFAULT_BUFFER_SIZE = 4096;
+static constexpr size_t KILOBYTE = 1024;
+static constexpr size_t MEGABYTE = 1024 * KILOBYTE;
+
+static constexpr size_t DEFAULT_BUFFER_SIZE = 4 * MEGABYTE;
+static constexpr size_t MIN_BUFFER_SIZE = std::max(CHUNK_SIZE * 32,
+						   64 * KILOBYTE);
+
 static constexpr unsigned DEFAULT_BUFFER_BEFORE_PLAY = 10;
 
 #ifdef ANDROID
@@ -129,7 +135,6 @@ struct Config {
 	ReplayGainConfig replay_gain;
 };
 
-gcc_const
 static Config
 LoadConfig()
 {
@@ -306,12 +311,17 @@ initialize_decoder_and_player(const ReplayGainConfig &replay_gain_config)
 			FormatFatalError("buffer size \"%s\" is not a "
 					 "positive integer, line %i",
 					 param->value.c_str(), param->line);
-		buffer_size = tmp;
+		buffer_size = tmp * KILOBYTE;
+
+		if (buffer_size < MIN_BUFFER_SIZE) {
+			FormatWarning(config_domain, "buffer size %lu is too small, using %lu bytes instead",
+				      (unsigned long)buffer_size,
+				      (unsigned long)MIN_BUFFER_SIZE);
+			buffer_size = MIN_BUFFER_SIZE;
+		}
 	} else
 		buffer_size = DEFAULT_BUFFER_SIZE;
 
-	buffer_size *= 1024;
-
 	const unsigned buffered_chunks = buffer_size / CHUNK_SIZE;
 
 	if (buffered_chunks >= 1 << 15)
@@ -329,6 +339,19 @@ initialize_decoder_and_player(const ReplayGainConfig &replay_gain_config)
 					 "than 100 percent, line %i",
 					 param->value.c_str(), param->line);
 		}
+
+		if (perc > 80) {
+			/* this upper limit should avoid deadlocks
+			   which can occur because the DecoderThread
+			   cannot ever fill the music buffer to
+			   exactly 100%; a few chunks always need to
+			   be available to generate silence in
+			   Player::SendSilence() */
+			FormatError(config_domain,
+				    "buffer_before_play is too large (%f%%), capping at 80%%; please fix your configuration",
+				    perc);
+			perc = 80;
+		}
 	} else
 		perc = DEFAULT_BUFFER_BEFORE_PLAY;
 

src/Mapper.cxx

@@ -59,14 +59,14 @@ mapper_init(AllocatedPath &&_playlist_dir)
 }
 
 void
-mapper_finish()
+mapper_finish() noexcept
 {
 }
 
 #ifdef ENABLE_DATABASE
 
 AllocatedPath
-map_uri_fs(const char *uri)
+map_uri_fs(const char *uri) noexcept
 {
 	assert(uri != nullptr);
 	assert(*uri != '/');
@@ -86,7 +86,7 @@ map_uri_fs(const char *uri)
 }
 
 std::string
-map_fs_to_utf8(Path path_fs)
+map_fs_to_utf8(Path path_fs) noexcept
 {
 	if (path_fs.IsAbsolute()) {
 		if (instance->storage == nullptr)
@@ -109,13 +109,13 @@ map_fs_to_utf8(Path path_fs)
 #endif
 
 const AllocatedPath &
-map_spl_path()
+map_spl_path() noexcept
 {
 	return playlist_dir_fs;
 }
 
 AllocatedPath
-map_spl_utf8_to_fs(const char *name)
+map_spl_utf8_to_fs(const char *name) noexcept
 {
 	if (playlist_dir_fs.IsNull())
 		return AllocatedPath::Null();

src/Mapper.hxx

@@ -37,7 +37,7 @@ void
 mapper_init(AllocatedPath &&playlist_dir);
 
 void
-mapper_finish();
+mapper_finish() noexcept;
 
 #ifdef ENABLE_DATABASE
 
@@ -48,7 +48,7 @@ mapper_finish();
  */
 gcc_pure
 AllocatedPath
-map_uri_fs(const char *uri);
+map_uri_fs(const char *uri) noexcept;
 
 /**
  * Maps a file system path (relative to the music directory or
@@ -60,7 +60,7 @@ map_uri_fs(const char *uri);
  */
 gcc_pure
 std::string
-map_fs_to_utf8(Path path_fs);
+map_fs_to_utf8(Path path_fs) noexcept;
 
 #endif
 
@@ -69,7 +69,7 @@ map_fs_to_utf8(Path path_fs);
  */
 gcc_const
 const AllocatedPath &
-map_spl_path();
+map_spl_path() noexcept;
 
 /**
  * Maps a playlist name (without the ".m3u" suffix) to a file system
@@ -79,6 +79,6 @@ map_spl_path();
  */
 gcc_pure
 AllocatedPath
-map_spl_utf8_to_fs(const char *name);
+map_spl_utf8_to_fs(const char *name) noexcept;
 
 #endif

src/MusicBuffer.cxx

@@ -23,19 +23,19 @@
 
 #include <assert.h>
 
-MusicBuffer::MusicBuffer(unsigned num_chunks)
+MusicBuffer::MusicBuffer(unsigned num_chunks) noexcept
 	:buffer(num_chunks) {
 }
 
 MusicChunk *
-MusicBuffer::Allocate()
+MusicBuffer::Allocate() noexcept
 {
 	const std::lock_guard<Mutex> protect(mutex);
 	return buffer.Allocate();
 }
 
 void
-MusicBuffer::Return(MusicChunk *chunk)
+MusicBuffer::Return(MusicChunk *chunk) noexcept
 {
 	assert(chunk != nullptr);
 

src/MusicBuffer.hxx

@@ -41,7 +41,7 @@ public:
 	 * @param num_chunks the number of #MusicChunk reserved in
 	 * this buffer
 	 */
-	MusicBuffer(unsigned num_chunks);
+	MusicBuffer(unsigned num_chunks) noexcept;
 
 #ifndef NDEBUG
 	/**
@@ -71,13 +71,13 @@ public:
 	 * @return an empty chunk or nullptr if there are no chunks
 	 * available
 	 */
-	MusicChunk *Allocate();
+	MusicChunk *Allocate() noexcept;
 
 	/**
 	 * Returns a chunk to the buffer.  It can be reused by
 	 * Allocate() then.
 	 */
-	void Return(MusicChunk *chunk);
+	void Return(MusicChunk *chunk) noexcept;
 };
 
 #endif

src/MusicChunk.cxx

@@ -31,7 +31,7 @@ MusicChunk::~MusicChunk()
 
 #ifndef NDEBUG
 bool
-MusicChunk::CheckFormat(const AudioFormat other_format) const
+MusicChunk::CheckFormat(const AudioFormat other_format) const noexcept
 {
 	assert(other_format.IsValid());
 
@@ -41,7 +41,7 @@ MusicChunk::CheckFormat(const AudioFormat other_format) const
 
 WritableBuffer<void>
 MusicChunk::Write(const AudioFormat af,
-		  SongTime data_time, uint16_t _bit_rate)
+		  SongTime data_time, uint16_t _bit_rate) noexcept
 {
 	assert(CheckFormat(af));
 	assert(length == 0 || audio_format.IsValid());
@@ -64,7 +64,7 @@ MusicChunk::Write(const AudioFormat af,
 }
 
 bool
-MusicChunk::Expand(const AudioFormat af, size_t _length)
+MusicChunk::Expand(const AudioFormat af, size_t _length) noexcept
 {
 	const size_t frame_size = af.GetFrameSize();
 

src/MusicChunk.hxx

@@ -111,7 +111,7 @@ struct MusicChunk {
 	 * specified audio_format.
 	 */
 	gcc_pure
-	bool CheckFormat(AudioFormat audio_format) const;
+	bool CheckFormat(AudioFormat audio_format) const noexcept;
 #endif
 
 	/**
@@ -127,7 +127,7 @@ struct MusicChunk {
 	 */
 	WritableBuffer<void> Write(AudioFormat af,
 				   SongTime data_time,
-				   uint16_t bit_rate);
+				   uint16_t bit_rate) noexcept;
 
 	/**
 	 * Increases the length of the chunk after the caller has written to
@@ -138,7 +138,7 @@ struct MusicChunk {
 	 * @param length the number of bytes which were appended
 	 * @return true if the chunk is full
 	 */
-	bool Expand(AudioFormat af, size_t length);
+	bool Expand(AudioFormat af, size_t length) noexcept;
 };
 
 #endif

src/MusicPipe.cxx

@@ -25,7 +25,7 @@
 #ifndef NDEBUG
 
 bool
-MusicPipe::Contains(const MusicChunk *chunk) const
+MusicPipe::Contains(const MusicChunk *chunk) const noexcept
 {
 	const std::lock_guard<Mutex> protect(mutex);
 

src/MusicPipe.hxx

@@ -86,7 +86,7 @@ public:
 	 * Checks if the specified chunk is enqueued in the music pipe.
 	 */
 	gcc_pure
-	bool Contains(const MusicChunk *chunk) const;
+	bool Contains(const MusicChunk *chunk) const noexcept;
 #endif
 
 	/**

src/Partition.hxx

@@ -205,7 +205,6 @@ struct Partition final : QueueListener, PlayerListener, MixerListener {
 	 */
 	const Database *GetDatabase() const;
 
-	gcc_pure
 	const Database &GetDatabaseOrThrow() const;
 
 	/**

src/Permission.cxx

@@ -49,7 +49,6 @@ static std::map<std::string, unsigned> permission_passwords;
 
 static unsigned permission_default;
 
-gcc_pure
 static unsigned
 ParsePermission(const char *p)
 {

src/ReplayGainInfo.cxx

@@ -24,7 +24,7 @@
 #include <math.h>
 
 float
-ReplayGainTuple::CalculateScale(const ReplayGainConfig &config) const
+ReplayGainTuple::CalculateScale(const ReplayGainConfig &config) const noexcept
 {
 	float scale;
 

src/ReplayGainInfo.hxx

@@ -40,23 +40,23 @@ struct ReplayGainTuple {
 	}
 
 	gcc_pure
-	float CalculateScale(const ReplayGainConfig &config) const;
+	float CalculateScale(const ReplayGainConfig &config) const noexcept;
 };
 
 struct ReplayGainInfo {
 	ReplayGainTuple track, album;
 
-	constexpr bool IsDefined() const {
+	constexpr bool IsDefined() const noexcept {
 		return track.IsDefined() || album.IsDefined();
 	}
 
-	const ReplayGainTuple &Get(ReplayGainMode mode) const {
+	const ReplayGainTuple &Get(ReplayGainMode mode) const noexcept {
 		return mode == ReplayGainMode::ALBUM
 			? (album.IsDefined() ? album : track)
 			: (track.IsDefined() ? track : album);
 	}
 
-	void Clear() {
+	void Clear() noexcept {
 		track.Clear();
 		album.Clear();
 	}

src/ReplayGainMode.cxx

@@ -25,7 +25,7 @@
 #include <string.h>
 
 const char *
-ToString(ReplayGainMode mode)
+ToString(ReplayGainMode mode) noexcept
 {
 	switch (mode) {
 	case ReplayGainMode::AUTO:

src/ReplayGainMode.hxx

@@ -36,13 +36,12 @@ enum class ReplayGainMode : uint8_t {
  */
 gcc_pure
 const char *
-ToString(ReplayGainMode mode);
+ToString(ReplayGainMode mode) noexcept;
 
 /**
  * Parse a string to a #ReplayGainMode.  Throws std::runtime_error on
  * error.
  */
-gcc_pure
 ReplayGainMode
 FromString(const char *s);
 

src/SongFilter.cxx

@@ -39,7 +39,7 @@
 #define LOCATE_TAG_ANY_KEY      "any"
 
 unsigned
-locate_parse_type(const char *str)
+locate_parse_type(const char *str) noexcept
 {
 	if (StringEqualsCaseASCII(str, LOCATE_TAG_FILE_KEY) ||
 	    StringEqualsCaseASCII(str, LOCATE_TAG_FILE_KEY_OLD))
@@ -57,7 +57,6 @@ locate_parse_type(const char *str)
 	return tag_name_parse_i(str);
 }
 
-gcc_pure
 static AllocatedString<>
 ImportString(const char *p, bool fold_case)
 {
@@ -78,7 +77,7 @@ SongFilter::Item::Item(unsigned _tag, time_t _time)
 }
 
 bool
-SongFilter::Item::StringMatch(const char *s) const
+SongFilter::Item::StringMatch(const char *s) const noexcept
 {
 #if !CLANG_CHECK_VERSION(3,6)
 	/* disabled on clang due to -Wtautological-pointer-compare */
@@ -97,14 +96,14 @@ SongFilter::Item::StringMatch(const char *s) const
 }
 
 bool
-SongFilter::Item::Match(const TagItem &item) const
+SongFilter::Item::Match(const TagItem &item) const noexcept
 {
 	return (tag == LOCATE_TAG_ANY_TYPE || (unsigned)item.type == tag) &&
 		StringMatch(item.value);
 }
 
 bool
-SongFilter::Item::Match(const Tag &_tag) const
+SongFilter::Item::Match(const Tag &_tag) const noexcept
 {
 	bool visited_types[TAG_NUM_OF_ITEM_TYPES];
 	std::fill_n(visited_types, size_t(TAG_NUM_OF_ITEM_TYPES), false);
@@ -140,7 +139,7 @@ SongFilter::Item::Match(const Tag &_tag) const
 }
 
 bool
-SongFilter::Item::Match(const DetachedSong &song) const
+SongFilter::Item::Match(const DetachedSong &song) const noexcept
 {
 	if (tag == LOCATE_TAG_BASE_TYPE)
 		return uri_is_child_or_same(value.c_str(), song.GetURI());
@@ -155,7 +154,7 @@ SongFilter::Item::Match(const DetachedSong &song) const
 }
 
 bool
-SongFilter::Item::Match(const LightSong &song) const
+SongFilter::Item::Match(const LightSong &song) const noexcept
 {
 	if (tag == LOCATE_TAG_BASE_TYPE) {
 		const auto uri = song.GetURI();
@@ -185,7 +184,7 @@ SongFilter::~SongFilter()
 
 gcc_pure
 static time_t
-ParseTimeStamp(const char *s)
+ParseTimeStamp(const char *s) noexcept
 {
 	assert(s != nullptr);
 
@@ -246,7 +245,7 @@ SongFilter::Parse(ConstBuffer<const char *> args, bool fold_case)
 }
 
 bool
-SongFilter::Match(const DetachedSong &song) const
+SongFilter::Match(const DetachedSong &song) const noexcept
 {
 	for (const auto &i : items)
 		if (!i.Match(song))
@@ -256,7 +255,7 @@ SongFilter::Match(const DetachedSong &song) const
 }
 
 bool
-SongFilter::Match(const LightSong &song) const
+SongFilter::Match(const LightSong &song) const noexcept
 {
 	for (const auto &i : items)
 		if (!i.Match(song))
@@ -266,7 +265,7 @@ SongFilter::Match(const LightSong &song) const
 }
 
 bool
-SongFilter::HasOtherThanBase() const
+SongFilter::HasOtherThanBase() const noexcept
 {
 	for (const auto &i : items)
 		if (i.GetTag() != LOCATE_TAG_BASE_TYPE)
@@ -276,7 +275,7 @@ SongFilter::HasOtherThanBase() const
 }
 
 const char *
-SongFilter::GetBase() const
+SongFilter::GetBase() const noexcept
 {
 	for (const auto &i : items)
 		if (i.GetTag() == LOCATE_TAG_BASE_TYPE)

src/SongFilter.hxx

@@ -80,19 +80,19 @@ public:
 		}
 
 		gcc_pure gcc_nonnull(2)
-		bool StringMatch(const char *s) const;
+		bool StringMatch(const char *s) const noexcept;
 
 		gcc_pure
-		bool Match(const TagItem &tag_item) const;
+		bool Match(const TagItem &tag_item) const noexcept;
 
 		gcc_pure
-		bool Match(const Tag &tag) const;
+		bool Match(const Tag &tag) const noexcept;
 
 		gcc_pure
-		bool Match(const DetachedSong &song) const;
+		bool Match(const DetachedSong &song) const noexcept;
 
 		gcc_pure
-		bool Match(const LightSong &song) const;
+		bool Match(const LightSong &song) const noexcept;
 	};
 
 private:
@@ -112,20 +112,20 @@ public:
 	bool Parse(ConstBuffer<const char *> args, bool fold_case=false);
 
 	gcc_pure
-	bool Match(const Tag &tag) const;
+	bool Match(const Tag &tag) const noexcept;
 
 	gcc_pure
-	bool Match(const DetachedSong &song) const;
+	bool Match(const DetachedSong &song) const noexcept;
 
 	gcc_pure
-	bool Match(const LightSong &song) const;
+	bool Match(const LightSong &song) const noexcept;
 
-	const std::list<Item> &GetItems() const {
+	const std::list<Item> &GetItems() const noexcept {
 		return items;
 	}
 
 	gcc_pure
-	bool IsEmpty() const {
+	bool IsEmpty() const noexcept {
 		return items.empty();
 	}
 
@@ -133,7 +133,7 @@ public:
 	 * Is there at least one item with "fold case" enabled?
 	 */
 	gcc_pure
-	bool HasFoldCase() const {
+	bool HasFoldCase() const noexcept {
 		for (const auto &i : items)
 			if (i.GetFoldCase())
 				return true;
@@ -145,14 +145,14 @@ public:
 	 * Does this filter contain constraints other than "base"?
 	 */
 	gcc_pure
-	bool HasOtherThanBase() const;
+	bool HasOtherThanBase() const noexcept;
 
 	/**
 	 * Returns the "base" specification (if there is one) or
 	 * nullptr.
 	 */
 	gcc_pure
-	const char *GetBase() const;
+	const char *GetBase() const noexcept;
 };
 
 /**
@@ -160,6 +160,6 @@ public:
  */
 gcc_pure
 unsigned
-locate_parse_type(const char *str);
+locate_parse_type(const char *str) noexcept;
 
 #endif

src/StateFile.cxx

@@ -50,7 +50,7 @@ StateFile::StateFile(AllocatedPath &&_path,
 }
 
 void
-StateFile::RememberVersions()
+StateFile::RememberVersions() noexcept
 {
 	prev_volume_version = sw_volume_state_get_hash();
 	prev_output_version = audio_output_state_get_version();
@@ -59,7 +59,7 @@ StateFile::RememberVersions()
 }
 
 bool
-StateFile::IsModified() const
+StateFile::IsModified() const noexcept
 {
 	return prev_volume_version != sw_volume_state_get_hash() ||
 		prev_output_version != audio_output_state_get_version() ||

src/StateFile.hxx

@@ -67,14 +67,14 @@ private:
 	/**
 	 * Save the current state versions for use with IsModified().
 	 */
-	void RememberVersions();
+	void RememberVersions() noexcept;
 
 	/**
 	 * Check if MPD's state was modified since the last
 	 * RememberVersions() call.
 	 */
 	gcc_pure
-	bool IsModified() const;
+	bool IsModified() const noexcept;
 
 	/* virtual methods from TimeoutMonitor */
 	void OnTimeout() override;

src/TagStream.cxx

@@ -40,7 +40,7 @@
 gcc_pure
 static bool
 CheckDecoderPlugin(const DecoderPlugin &plugin,
-		   const char *suffix, const char *mime)
+		   const char *suffix, const char *mime) noexcept
 {
 	return (mime != nullptr && plugin.SupportsMimeType(mime)) ||
 		(suffix != nullptr && plugin.SupportsSuffix(suffix));

src/archive/ArchiveLookup.cxx

@@ -28,7 +28,7 @@
 
 gcc_pure
 static char *
-FindSlash(char *p, size_t i)
+FindSlash(char *p, size_t i) noexcept
 {
 	for (; i > 0; --i)
 		if (p[i] == '/')
@@ -39,7 +39,7 @@ FindSlash(char *p, size_t i)
 
 gcc_pure
 static const char *
-FindSuffix(const char *p, const char *i)
+FindSuffix(const char *p, const char *i) noexcept
 {
 	for (; i > p; --i) {
 		if (*i == '.')

src/archive/plugins/Bzip2ArchivePlugin.cxx

@@ -93,7 +93,7 @@ public:
 	~Bzip2InputStream();
 
 	/* virtual methods from InputStream */
-	bool IsEOF() override;
+	bool IsEOF() noexcept override;
 	size_t Read(void *ptr, size_t size) override;
 
 private:
@@ -205,7 +205,7 @@ Bzip2InputStream::Read(void *ptr, size_t length)
 }
 
 bool
-Bzip2InputStream::IsEOF()
+Bzip2InputStream::IsEOF() noexcept
 {
 	return eof;
 }

src/archive/plugins/Iso9660ArchivePlugin.cxx

@@ -162,7 +162,7 @@ public:
 	}
 
 	/* virtual methods from InputStream */
-	bool IsEOF() override;
+	bool IsEOF() noexcept override;
 	size_t Read(void *ptr, size_t size) override;
 };
 
@@ -213,7 +213,7 @@ Iso9660InputStream::Read(void *ptr, size_t read_size)
 }
 
 bool
-Iso9660InputStream::IsEOF()
+Iso9660InputStream::IsEOF() noexcept
 {
 	return offset == size;
 }

src/archive/plugins/ZzipArchivePlugin.cxx

@@ -116,7 +116,7 @@ struct ZzipInputStream final : public InputStream {
 	}
 
 	/* virtual methods from InputStream */
-	bool IsEOF() override;
+	bool IsEOF() noexcept override;
 	size_t Read(void *ptr, size_t size) override;
 	void Seek(offset_type offset) override;
 };
@@ -147,7 +147,7 @@ ZzipInputStream::Read(void *ptr, size_t read_size)
 }
 
 bool
-ZzipInputStream::IsEOF()
+ZzipInputStream::IsEOF() noexcept
 {
 	return offset_type(zzip_tell(file)) == size;
 }

src/client/Client.cxx

@@ -46,7 +46,7 @@ Client::GetPlayerControl()
 #ifdef ENABLE_DATABASE
 
 const Database *
-Client::GetDatabase() const
+Client::GetDatabase() const noexcept
 {
 	return partition->instance.GetDatabase();
 }
@@ -58,7 +58,7 @@ Client::GetDatabaseOrThrow() const
 }
 
 const Storage *
-Client::GetStorage() const
+Client::GetStorage() const noexcept
 {
 	return partition->instance.storage;
 }

src/client/Client.hxx

@@ -166,7 +166,7 @@ public:
 	};
 
 	gcc_pure
-	bool IsSubscribed(const char *channel_name) const {
+	bool IsSubscribed(const char *channel_name) const noexcept {
 		return subscriptions.find(channel_name) != subscriptions.end();
 	}
 
@@ -211,16 +211,15 @@ public:
 	 * Wrapper for Instance::GetDatabase().
 	 */
 	gcc_pure
-	const Database *GetDatabase() const;
+	const Database *GetDatabase() const noexcept;
 
 	/**
 	 * Wrapper for Instance::GetDatabaseOrThrow().
 	 */
-	gcc_pure
 	const Database &GetDatabaseOrThrow() const;
 
 	gcc_pure
-	const Storage *GetStorage() const;
+	const Storage *GetStorage() const noexcept;
 
 private:
 	/* virtual methods from class BufferedSocket */

src/client/ClientMessage.cxx

@@ -23,14 +23,14 @@
 
 gcc_const
 static bool
-valid_channel_char(const char ch)
+valid_channel_char(const char ch) noexcept
 {
 	return IsAlphaNumericASCII(ch) ||
 		ch == '_' || ch == '-' || ch == '.' || ch == ':';
 }
 
 bool
-client_message_valid_channel_name(const char *name)
+client_message_valid_channel_name(const char *name) noexcept
 {
 	do {
 		if (!valid_channel_char(*name))

src/client/ClientMessage.hxx

@@ -53,6 +53,6 @@ public:
 
 gcc_pure
 bool
-client_message_valid_channel_name(const char *name);
+client_message_valid_channel_name(const char *name) noexcept;
 
 #endif

src/command/CommandError.cxx

@@ -54,7 +54,7 @@
 
 gcc_const
 static enum ack
-ToAck(PlaylistResult result)
+ToAck(PlaylistResult result) noexcept
 {
 	switch (result) {
 	case PlaylistResult::SUCCESS:
@@ -90,7 +90,7 @@ ToAck(PlaylistResult result)
 #ifdef ENABLE_DATABASE
 gcc_const
 static enum ack
-ToAck(DatabaseErrorCode code)
+ToAck(DatabaseErrorCode code) noexcept
 {
 	switch (code) {
 	case DatabaseErrorCode::DISABLED:
@@ -107,7 +107,7 @@ ToAck(DatabaseErrorCode code)
 
 gcc_pure
 static enum ack
-ToAck(std::exception_ptr ep)
+ToAck(std::exception_ptr ep) noexcept
 {
 	try {
 		std::rethrow_exception(ep);

src/command/FileCommands.cxx

@@ -44,7 +44,7 @@
 
 gcc_pure
 static bool
-SkipNameFS(PathTraitsFS::const_pointer_type name_fs)
+SkipNameFS(PathTraitsFS::const_pointer_type name_fs) noexcept
 {
 	return name_fs[0] == '.' &&
 		(name_fs[1] == 0 ||
@@ -53,7 +53,7 @@ SkipNameFS(PathTraitsFS::const_pointer_type name_fs)
 
 gcc_pure
 static bool
-skip_path(Path name_fs)
+skip_path(Path name_fs) noexcept
 {
 	return name_fs.HasNewline();
 }
@@ -107,7 +107,7 @@ handle_listfiles_local(Response &r, Path path_fs)
 
 gcc_pure
 static bool
-IsValidName(const char *p)
+IsValidName(const char *p) noexcept
 {
 	if (!IsAlphaASCII(*p))
 		return false;
@@ -123,7 +123,7 @@ IsValidName(const char *p)
 
 gcc_pure
 static bool
-IsValidValue(const char *p)
+IsValidValue(const char *p) noexcept
 {
 	while (*p) {
 		const char ch = *p++;

src/command/NeighborCommands.cxx

@@ -29,7 +29,7 @@
 #include <string>
 
 bool
-neighbor_commands_available(const Instance &instance)
+neighbor_commands_available(const Instance &instance) noexcept
 {
 	return instance.neighbors != nullptr;
 }

src/command/NeighborCommands.hxx

@@ -30,7 +30,7 @@ class Response;
 
 gcc_pure
 bool
-neighbor_commands_available(const Instance &instance);
+neighbor_commands_available(const Instance &instance) noexcept;
 
 CommandResult
 handle_listneighbors(Client &client, Request request, Response &response);

src/command/PlaylistCommands.cxx

@@ -39,7 +39,7 @@
 #include "util/ConstBuffer.hxx"
 
 bool
-playlist_commands_available()
+playlist_commands_available() noexcept
 {
 	return !map_spl_path().IsNull();
 }

src/command/PlaylistCommands.hxx

@@ -29,7 +29,7 @@ class Response;
 
 gcc_const
 bool
-playlist_commands_available();
+playlist_commands_available() noexcept;
 
 CommandResult
 handle_save(Client &client, Request request, Response &response);

src/command/StorageCommands.cxx

@@ -45,7 +45,7 @@
 
 gcc_pure
 static bool
-skip_path(const char *name_utf8)
+skip_path(const char *name_utf8) noexcept
 {
 	return strchr(name_utf8, '\n') != nullptr;
 }

src/config/Block.cxx

@@ -68,7 +68,7 @@ ConfigBlock::~ConfigBlock()
 }
 
 const BlockParam *
-ConfigBlock::GetBlockParam(const char *name) const
+ConfigBlock::GetBlockParam(const char *name) const noexcept
 {
 	for (const auto &i : block_params) {
 		if (i.name == name) {
@@ -81,7 +81,8 @@ ConfigBlock::GetBlockParam(const char *name) const
 }
 
 const char *
-ConfigBlock::GetBlockValue(const char *name, const char *default_value) const
+ConfigBlock::GetBlockValue(const char *name,
+			   const char *default_value) const noexcept
 {
 	const BlockParam *bp = GetBlockParam(name);
 	if (bp == nullptr)
@@ -128,7 +129,6 @@ ConfigBlock::GetBlockValue(const char *name, unsigned default_value) const
 	return bp->GetUnsignedValue();
 }
 
-gcc_pure
 bool
 ConfigBlock::GetBlockValue(const char *name, bool default_value) const
 {

src/config/Block.hxx

@@ -44,13 +44,10 @@ struct BlockParam {
 	BlockParam(const char *_name, const char *_value, int _line=-1)
 		:name(_name), value(_value), line(_line), used(false) {}
 
-	gcc_pure
 	int GetIntValue() const;
 
-	gcc_pure
 	unsigned GetUnsignedValue() const;
 
-	gcc_pure
 	bool GetBoolValue() const;
 };
 
@@ -101,11 +98,11 @@ struct ConfigBlock {
 	}
 
 	gcc_nonnull_all gcc_pure
-	const BlockParam *GetBlockParam(const char *_name) const;
+	const BlockParam *GetBlockParam(const char *_name) const noexcept;
 
 	gcc_pure
 	const char *GetBlockValue(const char *name,
-				  const char *default_value=nullptr) const;
+				  const char *default_value=nullptr) const noexcept;
 
 	/**
 	 * Same as config_get_path(), but looks up the setting in the
@@ -116,13 +113,10 @@ struct ConfigBlock {
 	AllocatedPath GetPath(const char *name,
 			      const char *default_value=nullptr) const;
 
-	gcc_pure
 	int GetBlockValue(const char *name, int default_value) const;
 
-	gcc_pure
 	unsigned GetBlockValue(const char *name, unsigned default_value) const;
 
-	gcc_pure
 	bool GetBlockValue(const char *name, bool default_value) const;
 };
 

src/config/ConfigGlobal.cxx

@@ -75,7 +75,7 @@ void config_global_check(void)
 }
 
 const ConfigParam *
-config_get_param(ConfigOption option)
+config_get_param(ConfigOption option) noexcept
 {
 	auto *param = config_data.params[unsigned(option)];
 	if (param != nullptr)
@@ -84,7 +84,7 @@ config_get_param(ConfigOption option)
 }
 
 const ConfigBlock *
-config_get_block(ConfigBlockOption option)
+config_get_block(ConfigBlockOption option) noexcept
 {
 	ConfigBlock *block = config_data.blocks[unsigned(option)];
 	if (block != nullptr)
@@ -110,7 +110,7 @@ config_find_block(ConfigBlockOption option, const char *key, const char *value)
 }
 
 const char *
-config_get_string(ConfigOption option, const char *default_value)
+config_get_string(ConfigOption option, const char *default_value) noexcept
 {
 	const auto *param = config_get_param(option);
 

src/config/ConfigGlobal.hxx

@@ -48,11 +48,11 @@ ReadConfigFile(Path path);
 
 gcc_pure
 const ConfigParam *
-config_get_param(enum ConfigOption option);
+config_get_param(enum ConfigOption option) noexcept;
 
 gcc_pure
 const ConfigBlock *
-config_get_block(enum ConfigBlockOption option);
+config_get_block(enum ConfigBlockOption option) noexcept;
 
 /**
  * Find a block with a matching attribute.
@@ -61,20 +61,12 @@ config_get_block(enum ConfigBlockOption option);
  * @param key the attribute name
  * @param value the expected attribute value
  */
-gcc_pure
 const ConfigBlock *
 config_find_block(ConfigBlockOption option, const char *key, const char *value);
 
-/* Note on gcc_pure: Some of the functions declared pure are not
-   really pure in strict sense.  They have side effect such that they
-   validate parameter's value and signal an error if it's invalid.
-   However, if the argument was already validated or we don't care
-   about the argument at all, this may be ignored so in the end, we
-   should be fine with calling those functions pure.  */
-
-gcc_pure
 const char *
-config_get_string(enum ConfigOption option, const char *default_value=nullptr);
+config_get_string(enum ConfigOption option,
+		  const char *default_value=nullptr) noexcept;
 
 /**
  * Returns an optional configuration variable which contains an
@@ -86,11 +78,9 @@ config_get_string(enum ConfigOption option, const char *default_value=nullptr);
 AllocatedPath
 config_get_path(enum ConfigOption option);
 
-gcc_pure
 unsigned
 config_get_unsigned(enum ConfigOption option, unsigned default_value);
 
-gcc_pure
 static inline std::chrono::steady_clock::duration
 config_get_unsigned(ConfigOption option,
 		    std::chrono::steady_clock::duration default_value)
@@ -100,11 +90,9 @@ config_get_unsigned(ConfigOption option,
 	return std::chrono::steady_clock::duration(u);
 }
 
-gcc_pure
 unsigned
 config_get_positive(enum ConfigOption option, unsigned default_value);
 
-gcc_pure
 static inline std::chrono::steady_clock::duration
 config_get_positive(ConfigOption option,
 		    std::chrono::steady_clock::duration default_value)
@@ -114,7 +102,6 @@ config_get_positive(ConfigOption option,
 	return std::chrono::steady_clock::duration(u);
 }
 
-gcc_pure
 bool config_get_bool(enum ConfigOption option, bool default_value);
 
 #endif

src/config/ConfigOption.hxx

@@ -102,13 +102,13 @@ enum class ConfigBlockOption {
  */
 gcc_pure
 enum ConfigOption
-ParseConfigOptionName(const char *name);
+ParseConfigOptionName(const char *name) noexcept;
 
 /**
  * @return #ConfigOption::MAX if not found
  */
 gcc_pure
 enum ConfigBlockOption
-ParseConfigBlockOptionName(const char *name);
+ParseConfigBlockOptionName(const char *name) noexcept;
 
 #endif

src/config/ConfigTemplates.cxx

@@ -101,7 +101,7 @@ static_assert(n_config_block_templates == unsigned(ConfigBlockOption::MAX),
 gcc_pure
 static inline unsigned
 ParseConfigTemplateName(const ConfigTemplate templates[], unsigned count,
-			const char *name)
+			const char *name) noexcept
 {
 	unsigned i = 0;
 	for (; i < count; ++i)
@@ -112,7 +112,7 @@ ParseConfigTemplateName(const ConfigTemplate templates[], unsigned count,
 }
 
 ConfigOption
-ParseConfigOptionName(const char *name)
+ParseConfigOptionName(const char *name) noexcept
 {
 	return ConfigOption(ParseConfigTemplateName(config_param_templates,
 						    n_config_param_templates,
@@ -120,7 +120,7 @@ ParseConfigOptionName(const char *name)
 }
 
 ConfigBlockOption
-ParseConfigBlockOptionName(const char *name)
+ParseConfigBlockOptionName(const char *name) noexcept
 {
 	return ConfigBlockOption(ParseConfigTemplateName(config_block_templates,
 							 n_config_block_templates,

src/config/Param.hxx

@@ -71,7 +71,6 @@ struct ConfigParam {
 	 *
 	 * Throws #std::runtime_error on error.
 	 */
-	gcc_pure
 	AllocatedPath GetPath() const;
 };
 

src/db/DatabaseLock.hxx

@@ -45,7 +45,7 @@ extern ThreadId db_mutex_holder;
  */
 gcc_pure
 static inline bool
-holding_db_lock(void)
+holding_db_lock() noexcept
 {
 	return db_mutex_holder.IsInside();
 }

src/db/DatabaseSong.hxx

@@ -31,7 +31,6 @@ class DetachedSong;
  * "Detach" the #Song object, i.e. convert it to a #DetachedSong
  * instance.
  */
-gcc_pure
 DetachedSong
 DatabaseDetachSong(const Storage *storage, const LightSong &song);
 

src/db/LightSong.cxx

@@ -21,7 +21,7 @@
 #include "tag/Tag.hxx"
 
 SignedSongTime
-LightSong::GetDuration() const
+LightSong::GetDuration() const noexcept
 {
 	SongTime a = start_time, b = end_time;
 	if (!b.IsPositive()) {

src/db/LightSong.hxx

@@ -76,7 +76,7 @@ struct LightSong {
 	SongTime end_time;
 
 	gcc_pure
-	std::string GetURI() const {
+	std::string GetURI() const noexcept {
 		if (directory == nullptr)
 			return std::string(uri);
 
@@ -87,7 +87,7 @@ struct LightSong {
 	}
 
 	gcc_pure
-	SignedSongTime GetDuration() const;
+	SignedSongTime GetDuration() const noexcept;
 };
 
 #endif

src/db/PlaylistVector.cxx

@@ -26,7 +26,7 @@
 #include <assert.h>
 
 PlaylistVector::iterator
-PlaylistVector::find(const char *name)
+PlaylistVector::find(const char *name) noexcept
 {
 	assert(holding_db_lock());
 	assert(name != nullptr);

src/db/PlaylistVector.hxx

@@ -31,7 +31,7 @@ protected:
 	 * Caller must lock the #db_mutex.
 	 */
 	gcc_pure
-	iterator find(const char *name);
+	iterator find(const char *name) noexcept;
 
 public:
 	using std::list<PlaylistInfo>::empty;

src/db/Registry.cxx

@@ -38,7 +38,7 @@ const DatabasePlugin *const database_plugins[] = {
 };
 
 const DatabasePlugin *
-GetDatabasePluginByName(const char *name)
+GetDatabasePluginByName(const char *name) noexcept
 {
 	for (auto i = database_plugins; *i != nullptr; ++i)
 		if (strcmp((*i)->name, name) == 0)

src/db/Registry.hxx

@@ -32,6 +32,6 @@ extern const DatabasePlugin *const database_plugins[];
 
 gcc_pure
 const DatabasePlugin *
-GetDatabasePluginByName(const char *name);
+GetDatabasePluginByName(const char *name) noexcept;
 
 #endif

src/db/Selection.cxx

@@ -34,19 +34,19 @@ DatabaseSelection::DatabaseSelection(const char *_uri, bool _recursive,
 }
 
 bool
-DatabaseSelection::IsEmpty() const
+DatabaseSelection::IsEmpty() const noexcept
 {
 	return uri.empty() && (filter == nullptr || filter->IsEmpty());
 }
 
 bool
-DatabaseSelection::HasOtherThanBase() const
+DatabaseSelection::HasOtherThanBase() const noexcept
 {
 	return filter != nullptr && filter->HasOtherThanBase();
 }
 
 bool
-DatabaseSelection::Match(const LightSong &song) const
+DatabaseSelection::Match(const LightSong &song) const noexcept
 {
 	return filter == nullptr || filter->Match(song);
 }

src/db/Selection.hxx

@@ -45,16 +45,16 @@ struct DatabaseSelection {
 			  const SongFilter *_filter=nullptr);
 
 	gcc_pure
-	bool IsEmpty() const;
+	bool IsEmpty() const noexcept;
 
 	/**
 	 * Does this selection contain constraints other than "base"?
 	 */
 	gcc_pure
-	bool HasOtherThanBase() const;
+	bool HasOtherThanBase() const noexcept;
 
 	gcc_pure
-	bool Match(const LightSong &song) const;
+	bool Match(const LightSong &song) const noexcept;
 };
 
 #endif

src/db/plugins/ProxyDatabasePlugin.cxx

@@ -220,7 +220,7 @@ ProxySong::ProxySong(const mpd_song *song)
 
 gcc_const
 static enum mpd_tag_type
-Convert(TagType tag_type)
+Convert(TagType tag_type) noexcept
 {
 	for (auto i = &tag_table[0]; i->d != TAG_NUM_OF_ITEM_TYPES; ++i)
 		if (i->d == tag_type)
@@ -578,7 +578,7 @@ Visit(struct mpd_connection *connection,
 
 gcc_pure
 static bool
-Match(const SongFilter *filter, const LightSong &song)
+Match(const SongFilter *filter, const LightSong &song) noexcept
 {
 	return filter == nullptr || filter->Match(song);
 }
@@ -721,7 +721,7 @@ SearchSongs(struct mpd_connection *connection,
  */
 gcc_pure
 static bool
-ServerSupportsSearchBase(const struct mpd_connection *connection)
+ServerSupportsSearchBase(const struct mpd_connection *connection) noexcept
 {
 #if LIBMPDCLIENT_CHECK_VERSION(2,9,0)
 	return mpd_connection_cmp_server_version(connection, 0, 18, 0) >= 0;

src/db/plugins/simple/Directory.cxx

@@ -62,7 +62,7 @@ Directory::Delete()
 }
 
 const char *
-Directory::GetName() const
+Directory::GetName() const noexcept
 {
 	assert(!IsRoot());
 
@@ -86,7 +86,7 @@ Directory::CreateChild(const char *name_utf8)
 }
 
 const Directory *
-Directory::FindChild(const char *name) const
+Directory::FindChild(const char *name) const noexcept
 {
 	assert(holding_db_lock());
 
@@ -98,7 +98,7 @@ Directory::FindChild(const char *name) const
 }
 
 void
-Directory::PruneEmpty()
+Directory::PruneEmpty() noexcept
 {
 	assert(holding_db_lock());
 
@@ -115,7 +115,7 @@ Directory::PruneEmpty()
 }
 
 Directory::LookupResult
-Directory::LookupDirectory(const char *uri)
+Directory::LookupDirectory(const char *uri) noexcept
 {
 	assert(holding_db_lock());
 	assert(uri != nullptr);
@@ -170,7 +170,7 @@ Directory::AddSong(Song *song)
 }
 
 void
-Directory::RemoveSong(Song *song)
+Directory::RemoveSong(Song *song) noexcept
 {
 	assert(holding_db_lock());
 	assert(song != nullptr);
@@ -180,7 +180,7 @@ Directory::RemoveSong(Song *song)
 }
 
 const Song *
-Directory::FindSong(const char *name_utf8) const
+Directory::FindSong(const char *name_utf8) const noexcept
 {
 	assert(holding_db_lock());
 	assert(name_utf8 != nullptr);
@@ -197,13 +197,13 @@ Directory::FindSong(const char *name_utf8) const
 
 gcc_pure
 static bool
-directory_cmp(const Directory &a, const Directory &b)
+directory_cmp(const Directory &a, const Directory &b) noexcept
 {
 	return IcuCollate(a.path.c_str(), b.path.c_str()) < 0;
 }
 
 void
-Directory::Sort()
+Directory::Sort() noexcept
 {
 	assert(holding_db_lock());
 
@@ -258,7 +258,7 @@ Directory::Walk(bool recursive, const SongFilter *filter,
 }
 
 LightDirectory
-Directory::Export() const
+Directory::Export() const noexcept
 {
 	return LightDirectory(GetPath(), mtime);
 }

src/db/plugins/simple/Directory.hxx

@@ -134,10 +134,10 @@ public:
 	 * Caller must lock the #db_mutex.
 	 */
 	gcc_pure
-	const Directory *FindChild(const char *name) const;
+	const Directory *FindChild(const char *name) const noexcept;
 
 	gcc_pure
-	Directory *FindChild(const char *name) {
+	Directory *FindChild(const char *name) noexcept {
 		const Directory *cthis = this;
 		return const_cast<Directory *>(cthis->FindChild(name));
 	}
@@ -177,10 +177,10 @@ public:
 	 * @return the Directory, or nullptr if none was found
 	 */
 	gcc_pure
-	LookupResult LookupDirectory(const char *uri);
+	LookupResult LookupDirectory(const char *uri) noexcept;
 
 	gcc_pure
-	bool IsEmpty() const {
+	bool IsEmpty() const noexcept {
 		return children.empty() &&
 			songs.empty() &&
 			playlists.empty();
@@ -195,13 +195,13 @@ public:
 	 * Returns the base name of the directory.
 	 */
 	gcc_pure
-	const char *GetName() const;
+	const char *GetName() const noexcept;
 
 	/**
 	 * Is this the root directory of the music database?
 	 */
 	gcc_pure
-	bool IsRoot() const {
+	bool IsRoot() const noexcept {
 		return parent == nullptr;
 	}
 
@@ -229,10 +229,10 @@ public:
 	 * Caller must lock the #db_mutex.
 	 */
 	gcc_pure
-	const Song *FindSong(const char *name_utf8) const;
+	const Song *FindSong(const char *name_utf8) const noexcept;
 
 	gcc_pure
-	Song *FindSong(const char *name_utf8) {
+	Song *FindSong(const char *name_utf8) noexcept {
 		const Directory *cthis = this;
 		return const_cast<Song *>(cthis->FindSong(name_utf8));
 	}
@@ -248,19 +248,19 @@ public:
 	 * invalidates the song object, because the "parent" attribute becomes
 	 * stale), but does not free it.
 	 */
-	void RemoveSong(Song *song);
+	void RemoveSong(Song *song) noexcept;
 
 	/**
 	 * Caller must lock the #db_mutex.
 	 */
-	void PruneEmpty();
+	void PruneEmpty() noexcept;
 
 	/**
 	 * Sort all directory entries recursively.
 	 *
 	 * Caller must lock the #db_mutex.
 	 */
-	void Sort();
+	void Sort() noexcept;
 
 	/**
 	 * Caller must lock #db_mutex.
@@ -270,7 +270,7 @@ public:
 		  VisitPlaylist visit_playlist) const;
 
 	gcc_pure
-	LightDirectory Export() const;
+	LightDirectory Export() const noexcept;
 };
 
 #endif

src/db/plugins/simple/DirectorySave.cxx

@@ -40,7 +40,7 @@
 
 gcc_const
 static const char *
-DeviceToTypeString(unsigned device)
+DeviceToTypeString(unsigned device) noexcept
 {
 	switch (device) {
 	case DEVICE_INARCHIVE:
@@ -56,7 +56,7 @@ DeviceToTypeString(unsigned device)
 
 gcc_pure
 static unsigned
-ParseTypeString(const char *type)
+ParseTypeString(const char *type) noexcept
 {
 	if (strcmp(type, "archive") == 0)
 		return DEVICE_INARCHIVE;

src/db/plugins/simple/Song.cxx

@@ -77,7 +77,7 @@ Song::Free()
 }
 
 std::string
-Song::GetURI() const
+Song::GetURI() const noexcept
 {
 	assert(*uri);
 
@@ -96,7 +96,7 @@ Song::GetURI() const
 }
 
 LightSong
-Song::Export() const
+Song::Export() const noexcept
 {
 	LightSong dest;
 	dest.directory = parent->IsRoot()

src/db/plugins/simple/Song.hxx

@@ -123,10 +123,10 @@ struct Song {
 	 * location within the music directory.
 	 */
 	gcc_pure
-	std::string GetURI() const;
+	std::string GetURI() const noexcept;
 
 	gcc_pure
-	LightSong Export() const;
+	LightSong Export() const noexcept;
 };
 
 typedef boost::intrusive::list<Song,

src/db/plugins/simple/SongSort.cxx

@@ -26,7 +26,7 @@
 #include <stdlib.h>
 
 static int
-compare_utf8_string(const char *a, const char *b)
+compare_utf8_string(const char *a, const char *b) noexcept
 {
 	if (a == nullptr)
 		return b == nullptr ? 0 : -1;
@@ -42,8 +42,7 @@ compare_utf8_string(const char *a, const char *b)
  * nullptr.
  */
 static int
-compare_string_tag_item(const Tag &a, const Tag &b,
-			TagType type)
+compare_string_tag_item(const Tag &a, const Tag &b, TagType type) noexcept
 {
 	return compare_utf8_string(a.GetValue(type),
 				   b.GetValue(type));
@@ -54,7 +53,7 @@ compare_string_tag_item(const Tag &a, const Tag &b,
  * (e.g. disc or track number).  Either one may be nullptr.
  */
 static int
-compare_number_string(const char *a, const char *b)
+compare_number_string(const char *a, const char *b) noexcept
 {
 	long ai = a == nullptr ? 0 : strtol(a, nullptr, 10);
 	long bi = b == nullptr ? 0 : strtol(b, nullptr, 10);
@@ -69,7 +68,7 @@ compare_number_string(const char *a, const char *b)
 }
 
 static int
-compare_tag_item(const Tag &a, const Tag &b, TagType type)
+compare_tag_item(const Tag &a, const Tag &b, TagType type) noexcept
 {
 	return compare_number_string(a.GetValue(type),
 				     b.GetValue(type));
@@ -78,7 +77,7 @@ compare_tag_item(const Tag &a, const Tag &b, TagType type)
 /* Only used for sorting/searchin a songvec, not general purpose compares */
 gcc_pure
 static bool
-song_cmp(const Song &a, const Song &b)
+song_cmp(const Song &a, const Song &b) noexcept
 {
 	int ret;
 
@@ -102,7 +101,7 @@ song_cmp(const Song &a, const Song &b)
 }
 
 void
-song_list_sort(SongList &songs)
+song_list_sort(SongList &songs) noexcept
 {
 	songs.sort(song_cmp);
 }

src/db/plugins/simple/SongSort.hxx

@@ -23,6 +23,6 @@
 #include "Song.hxx"
 
 void
-song_list_sort(SongList &songs);
+song_list_sort(SongList &songs) noexcept;
 
 #endif

src/db/plugins/upnp/Directory.cxx

@@ -39,7 +39,7 @@ UPnPDirContent::~UPnPDirContent()
 
 gcc_pure
 static UPnPDirObject::ItemClass
-ParseItemClass(StringView name)
+ParseItemClass(StringView name) noexcept
 {
 	if (name.EqualsLiteral("object.item.audioItem.musicTrack"))
 		return UPnPDirObject::ItemClass::MUSIC;
@@ -51,7 +51,7 @@ ParseItemClass(StringView name)
 
 gcc_pure
 static SignedSongTime
-ParseDuration(const char *duration)
+ParseDuration(const char *duration) noexcept
 {
 	char *endptr;
 
@@ -81,7 +81,7 @@ ParseDuration(const char *duration)
  */
 gcc_pure
 static std::string &&
-TitleToPathSegment(std::string &&s)
+TitleToPathSegment(std::string &&s) noexcept
 {
 	std::replace(s.begin(), s.end(), '/', '_');
 	return std::move(s);

src/db/plugins/upnp/Directory.hxx

@@ -40,7 +40,7 @@ public:
 	~UPnPDirContent();
 
 	gcc_pure
-	UPnPDirObject *FindObject(const char *name) {
+	UPnPDirObject *FindObject(const char *name) noexcept {
 		for (auto &o : objects)
 			if (o.name == name)
 				return &o;

src/db/update/InotifyQueue.cxx

@@ -56,7 +56,7 @@ InotifyQueue::OnTimeout()
 
 gcc_pure
 static bool
-path_in(const char *path, const char *possible_parent)
+path_in(const char *path, const char *possible_parent) noexcept
 {
 	if (StringIsEmpty(path))
 		return true;

src/db/update/InotifyUpdate.cxx

@@ -62,10 +62,10 @@ struct WatchDirectory {
 	WatchDirectory &operator=(const WatchDirectory &) = delete;
 
 	gcc_pure
-	unsigned GetDepth() const;
+	unsigned GetDepth() const noexcept;
 
 	gcc_pure
-	AllocatedPath GetUriFS() const;
+	AllocatedPath GetUriFS() const noexcept;
 };
 
 static InotifySource *inotify_source;
@@ -132,7 +132,7 @@ remove_watch_directory(WatchDirectory *directory)
 }
 
 AllocatedPath
-WatchDirectory::GetUriFS() const
+WatchDirectory::GetUriFS() const noexcept
 {
 	if (parent == nullptr)
 		return AllocatedPath::Null();
@@ -225,7 +225,7 @@ recursive_watch_subdirectories(WatchDirectory *directory,
 
 gcc_pure
 unsigned
-WatchDirectory::GetDepth() const
+WatchDirectory::GetDepth() const noexcept
 {
 	const WatchDirectory *d = this;
 	unsigned depth = 0;
@@ -331,7 +331,7 @@ mpd_inotify_init(EventLoop &loop, Storage &storage, UpdateService &update,
 }
 
 void
-mpd_inotify_finish(void)
+mpd_inotify_finish(void) noexcept
 {
 	if (inotify_source == nullptr)
 		return;

src/db/update/InotifyUpdate.hxx

@@ -32,6 +32,6 @@ mpd_inotify_init(EventLoop &loop, Storage &storage, UpdateService &update,
 		 unsigned max_depth);
 
 void
-mpd_inotify_finish();
+mpd_inotify_finish() noexcept;
 
 #endif

src/db/update/UpdateIO.cxx

@@ -32,7 +32,7 @@
 #include <errno.h>
 
 bool
-GetInfo(Storage &storage, const char *uri_utf8, StorageFileInfo &info)
+GetInfo(Storage &storage, const char *uri_utf8, StorageFileInfo &info) noexcept
 try {
 	info = storage.GetInfo(uri_utf8, true);
 	return true;
@@ -42,7 +42,7 @@ try {
 }
 
 bool
-GetInfo(StorageDirectoryReader &reader, StorageFileInfo &info)
+GetInfo(StorageDirectoryReader &reader, StorageFileInfo &info) noexcept
 try {
 	info = reader.GetInfo(true);
 	return true;
@@ -52,7 +52,7 @@ try {
 }
 
 bool
-DirectoryExists(Storage &storage, const Directory &directory)
+DirectoryExists(Storage &storage, const Directory &directory) noexcept
 {
 	StorageFileInfo info;
 
@@ -79,7 +79,7 @@ GetDirectoryChildInfo(Storage &storage, const Directory &directory,
 
 bool
 directory_child_is_regular(Storage &storage, const Directory &directory,
-			   const char *name_utf8)
+			   const char *name_utf8) noexcept
 try {
 	return GetDirectoryChildInfo(storage, directory, name_utf8)
 		.IsRegular();
@@ -89,7 +89,7 @@ try {
 
 bool
 directory_child_access(Storage &storage, const Directory &directory,
-		       const char *name, int mode)
+		       const char *name, int mode) noexcept
 {
 #ifdef WIN32
 	/* CheckAccess() is useless on WIN32 */

src/db/update/UpdateIO.hxx

@@ -33,23 +33,23 @@ class StorageDirectoryReader;
  * returning them.
  */
 bool
-GetInfo(Storage &storage, const char *uri_utf8, StorageFileInfo &info);
+GetInfo(Storage &storage, const char *uri_utf8, StorageFileInfo &info) noexcept;
 
 /**
  * Wrapper for LocalDirectoryReader::GetInfo() that logs errors
  * instead of returning them.
  */
 bool
-GetInfo(StorageDirectoryReader &reader, StorageFileInfo &info);
+GetInfo(StorageDirectoryReader &reader, StorageFileInfo &info) noexcept;
 
 gcc_pure
 bool
-DirectoryExists(Storage &storage, const Directory &directory);
+DirectoryExists(Storage &storage, const Directory &directory) noexcept;
 
 gcc_pure
 bool
 directory_child_is_regular(Storage &storage, const Directory &directory,
-			   const char *name_utf8);
+			   const char *name_utf8) noexcept;
 
 /**
  * Checks if the given permissions on the mapped file are given.
@@ -57,6 +57,6 @@ directory_child_is_regular(Storage &storage, const Directory &directory,
 gcc_pure
 bool
 directory_child_access(Storage &storage, const Directory &directory,
-		       const char *name, int mode);
+		       const char *name, int mode) noexcept;
 
 #endif

src/db/update/Walk.cxx

@@ -248,7 +248,7 @@ try {
 /* we don't look at "." / ".." nor files with newlines in their name */
 gcc_pure
 static bool
-skip_path(const char *name_utf8)
+skip_path(const char *name_utf8) noexcept
 {
 	return strchr(name_utf8, '\n') != nullptr;
 }
@@ -256,7 +256,7 @@ skip_path(const char *name_utf8)
 gcc_pure
 bool
 UpdateWalk::SkipSymlink(const Directory *directory,
-			const char *utf8_name) const
+			const char *utf8_name) const noexcept
 {
 #ifndef WIN32
 	const auto path_fs = storage.MapChildFS(directory->GetPath(),

src/db/update/Walk.hxx

@@ -78,7 +78,7 @@ public:
 private:
 	gcc_pure
 	bool SkipSymlink(const Directory *directory,
-			 const char *utf8_name) const;
+			 const char *utf8_name) const noexcept;
 
 	void RemoveExcludedFromDirectory(Directory &directory,
 					 const ExcludeList &exclude_list);

src/decoder/Bridge.cxx

@@ -54,7 +54,7 @@ DecoderBridge::~DecoderBridge()
 }
 
 bool
-DecoderBridge::CheckCancelRead() const
+DecoderBridge::CheckCancelRead() const noexcept
 {
 	if (error)
 		/* this translates to DecoderCommand::STOP */
@@ -78,7 +78,7 @@ DecoderBridge::CheckCancelRead() const
  * one.
  */
 static DecoderCommand
-need_chunks(DecoderControl &dc)
+need_chunks(DecoderControl &dc) noexcept
 {
 	if (dc.command == DecoderCommand::NONE)
 		dc.Wait();
@@ -87,14 +87,14 @@ need_chunks(DecoderControl &dc)
 }
 
 static DecoderCommand
-LockNeedChunks(DecoderControl &dc)
+LockNeedChunks(DecoderControl &dc) noexcept
 {
 	const std::lock_guard<Mutex> protect(dc.mutex);
 	return need_chunks(dc);
 }
 
 MusicChunk *
-DecoderBridge::GetChunk()
+DecoderBridge::GetChunk() noexcept
 {
 	DecoderCommand cmd;
 
@@ -177,7 +177,7 @@ DecoderBridge::PrepareInitialSeek()
 }
 
 DecoderCommand
-DecoderBridge::GetVirtualCommand()
+DecoderBridge::GetVirtualCommand() noexcept
 {
 	if (error)
 		/* an error has occurred: stop the decoder plugin */
@@ -192,7 +192,7 @@ DecoderBridge::GetVirtualCommand()
 }
 
 DecoderCommand
-DecoderBridge::LockGetVirtualCommand()
+DecoderBridge::LockGetVirtualCommand() noexcept
 {
 	const std::lock_guard<Mutex> protect(dc.mutex);
 	return GetVirtualCommand();

src/decoder/Bridge.hxx

@@ -114,7 +114,7 @@ public:
 	 * Caller must lock the #DecoderControl object.
 	 */
 	gcc_pure
-	bool CheckCancelRead() const;
+	bool CheckCancelRead() const noexcept;
 
 	/**
 	 * Returns the current chunk the decoder writes to, or allocates a new
@@ -122,7 +122,7 @@ public:
 	 *
 	 * @return the chunk, or NULL if we have received a decoder command
 	 */
-	MusicChunk *GetChunk();
+	MusicChunk *GetChunk() noexcept;
 
 	/**
 	 * Flushes the current chunk.
@@ -161,8 +161,8 @@ private:
 	 * "virtual" synthesized command, e.g. to seek to the
 	 * beginning of the CUE track.
 	 */
-	DecoderCommand GetVirtualCommand();
-	DecoderCommand LockGetVirtualCommand();
+	DecoderCommand GetVirtualCommand() noexcept;
+	DecoderCommand LockGetVirtualCommand() noexcept;
 
 	/**
 	 * Sends a #Tag as-is to the #MusicPipe.  Flushes the current

src/decoder/DecoderControl.cxx

@@ -75,7 +75,7 @@ DecoderControl::SetReady(const AudioFormat audio_format,
 }
 
 bool
-DecoderControl::IsCurrentSong(const DetachedSong &_song) const
+DecoderControl::IsCurrentSong(const DetachedSong &_song) const noexcept
 {
 	switch (state) {
 	case DecoderState::STOP:

src/decoder/DecoderControl.hxx

@@ -305,10 +305,10 @@ struct DecoderControl {
 	 * Caller must lock the object.
 	 */
 	gcc_pure
-	bool IsCurrentSong(const DetachedSong &_song) const;
+	bool IsCurrentSong(const DetachedSong &_song) const noexcept;
 
 	gcc_pure
-	bool LockIsCurrentSong(const DetachedSong &_song) const {
+	bool LockIsCurrentSong(const DetachedSong &_song) const noexcept {
 		const std::lock_guard<Mutex> protect(mutex);
 		return IsCurrentSong(_song);
 	}

src/decoder/DecoderList.cxx

@@ -118,7 +118,7 @@ static constexpr unsigned num_decoder_plugins =
 bool decoder_plugins_enabled[num_decoder_plugins];
 
 const struct DecoderPlugin *
-decoder_plugin_from_name(const char *name)
+decoder_plugin_from_name(const char *name) noexcept
 {
 	return decoder_plugins_find([=](const DecoderPlugin &plugin){
 			return strcmp(plugin.name, name) == 0;
@@ -154,7 +154,7 @@ void decoder_plugin_deinit_all(void)
 }
 
 bool
-decoder_plugins_supports_suffix(const char *suffix)
+decoder_plugins_supports_suffix(const char *suffix) noexcept
 {
 	return decoder_plugins_try([suffix](const DecoderPlugin &plugin){
 			return plugin.SupportsSuffix(suffix);

src/decoder/DecoderList.hxx

@@ -31,7 +31,7 @@ extern bool decoder_plugins_enabled[];
 
 gcc_pure
 const struct DecoderPlugin *
-decoder_plugin_from_name(const char *name);
+decoder_plugin_from_name(const char *name) noexcept;
 
 /* this is where we "load" all the "plugins" ;-) */
 void
@@ -86,6 +86,6 @@ decoder_plugins_for_each_enabled(F f)
  */
 gcc_pure gcc_nonnull_all
 bool
-decoder_plugins_supports_suffix(const char *suffix);
+decoder_plugins_supports_suffix(const char *suffix) noexcept;
 
 #endif

src/decoder/DecoderPlugin.cxx

@@ -24,7 +24,7 @@
 #include <assert.h>
 
 bool
-DecoderPlugin::SupportsSuffix(const char *suffix) const
+DecoderPlugin::SupportsSuffix(const char *suffix) const noexcept
 {
 #if !CLANG_CHECK_VERSION(3,6)
 	/* disabled on clang due to -Wtautological-pointer-compare */
@@ -36,7 +36,7 @@ DecoderPlugin::SupportsSuffix(const char *suffix) const
 }
 
 bool
-DecoderPlugin::SupportsMimeType(const char *mime_type) const
+DecoderPlugin::SupportsMimeType(const char *mime_type) const noexcept
 {
 #if !CLANG_CHECK_VERSION(3,6)
 	/* disabled on clang due to -Wtautological-pointer-compare */

src/decoder/DecoderPlugin.hxx

@@ -168,13 +168,13 @@ struct DecoderPlugin {
 	 * Does the plugin announce the specified file name suffix?
 	 */
 	gcc_pure gcc_nonnull_all
-	bool SupportsSuffix(const char *suffix) const;
+	bool SupportsSuffix(const char *suffix) const noexcept;
 
 	/**
 	 * Does the plugin announce the specified MIME type?
 	 */
 	gcc_pure gcc_nonnull_all
-	bool SupportsMimeType(const char *mime_type) const;
+	bool SupportsMimeType(const char *mime_type) const noexcept;
 };
 
 #endif

src/decoder/DecoderThread.cxx

@@ -170,7 +170,8 @@ decoder_file_decode(const DecoderPlugin &plugin,
 
 gcc_pure
 static bool
-decoder_check_plugin_mime(const DecoderPlugin &plugin, const InputStream &is)
+decoder_check_plugin_mime(const DecoderPlugin &plugin,
+			  const InputStream &is) noexcept
 {
 	assert(plugin.stream_decode != nullptr);
 
@@ -181,7 +182,8 @@ decoder_check_plugin_mime(const DecoderPlugin &plugin, const InputStream &is)
 
 gcc_pure
 static bool
-decoder_check_plugin_suffix(const DecoderPlugin &plugin, const char *suffix)
+decoder_check_plugin_suffix(const DecoderPlugin &plugin,
+			    const char *suffix) noexcept
 {
 	assert(plugin.stream_decode != nullptr);
 
@@ -191,7 +193,7 @@ decoder_check_plugin_suffix(const DecoderPlugin &plugin, const char *suffix)
 gcc_pure
 static bool
 decoder_check_plugin(const DecoderPlugin &plugin, const InputStream &is,
-		     const char *suffix)
+		     const char *suffix) noexcept
 {
 	return plugin.stream_decode != nullptr &&
 		(decoder_check_plugin_mime(plugin, is) ||

src/decoder/plugins/AudiofileDecoderPlugin.cxx

@@ -66,7 +66,7 @@ struct AudioFileInputStream {
 
 gcc_pure
 static SongTime
-audiofile_get_duration(AFfilehandle fh)
+audiofile_get_duration(AFfilehandle fh) noexcept
 {
 	return SongTime::FromScale<uint64_t>(afGetFrameCount(fh, AF_DEFAULT_TRACK),
 					     afGetRate(fh, AF_DEFAULT_TRACK));
@@ -239,7 +239,7 @@ audiofile_stream_decode(DecoderClient &client, InputStream &is)
 
 gcc_pure
 static SignedSongTime
-audiofile_get_duration(InputStream &is)
+audiofile_get_duration(InputStream &is) noexcept
 {
 	if (!is.IsSeekable() || !is.KnownSize())
 		return SignedSongTime::Negative();

src/decoder/plugins/DsdLib.cxx

@@ -39,7 +39,7 @@
 #include <stdlib.h>
 
 bool
-DsdId::Equals(const char *s) const
+DsdId::Equals(const char *s) const noexcept
 {
 	assert(s != nullptr);
 	assert(strlen(s) == sizeof(value));
@@ -95,7 +95,7 @@ dsdlib_skip(DecoderClient *client, InputStream &is,
 }
 
 bool
-dsdlib_valid_freq(uint32_t samplefreq)
+dsdlib_valid_freq(uint32_t samplefreq) noexcept
 {
 	switch (samplefreq) {
 	case 2822400: /* DSD64, 64xFs, Fs = 44.100kHz */

src/decoder/plugins/DsdLib.hxx

@@ -34,7 +34,7 @@ struct DsdId {
 	char value[4];
 
 	gcc_pure
-	bool Equals(const char *s) const;
+	bool Equals(const char *s) const noexcept;
 };
 
 class DsdUint64 {
@@ -72,7 +72,7 @@ dsdlib_skip(DecoderClient *client, InputStream &is,
  **/
 gcc_const
 bool
-dsdlib_valid_freq(uint32_t samplefreq);
+dsdlib_valid_freq(uint32_t samplefreq) noexcept;
 
 /**
  * Add tags from ID3 tag. All tags commonly found in the ID3 tags of

src/decoder/plugins/FfmpegDecoderPlugin.cxx

@@ -112,14 +112,14 @@ ffmpeg_finish()
 
 gcc_pure
 static const AVCodecParameters &
-GetCodecParameters(const AVStream &stream)
+GetCodecParameters(const AVStream &stream) noexcept
 {
 	return *stream.codecpar;
 }
 
 gcc_pure
 static AVSampleFormat
-GetSampleFormat(const AVCodecParameters &codec_params)
+GetSampleFormat(const AVCodecParameters &codec_params) noexcept
 {
 	return AVSampleFormat(codec_params.format);
 }
@@ -128,14 +128,14 @@ GetSampleFormat(const AVCodecParameters &codec_params)
 
 gcc_pure
 static const AVCodecContext &
-GetCodecParameters(const AVStream &stream)
+GetCodecParameters(const AVStream &stream) noexcept
 {
 	return *stream.codec;
 }
 
 gcc_pure
 static AVSampleFormat
-GetSampleFormat(const AVCodecContext &codec_context)
+GetSampleFormat(const AVCodecContext &codec_context) noexcept
 {
 	return codec_context.sample_fmt;
 }
@@ -144,14 +144,14 @@ GetSampleFormat(const AVCodecContext &codec_context)
 
 gcc_pure
 static bool
-IsAudio(const AVStream &stream)
+IsAudio(const AVStream &stream) noexcept
 {
 	return GetCodecParameters(stream).codec_type == AVMEDIA_TYPE_AUDIO;
 }
 
 gcc_pure
 static int
-ffmpeg_find_audio_stream(const AVFormatContext &format_context)
+ffmpeg_find_audio_stream(const AVFormatContext &format_context) noexcept
 {
 	for (unsigned i = 0; i < format_context.nb_streams; ++i)
 		if (IsAudio(*format_context.streams[i]))
@@ -220,7 +220,7 @@ copy_interleave_frame(const AVCodecContext &codec_context,
  */
 gcc_pure
 static int64_t
-StreamRelativePts(const AVPacket &packet, const AVStream &stream)
+StreamRelativePts(const AVPacket &packet, const AVStream &stream) noexcept
 {
 	auto pts = packet.pts;
 	if (pts < 0 || pts == int64_t(AV_NOPTS_VALUE))
@@ -237,7 +237,7 @@ StreamRelativePts(const AVPacket &packet, const AVStream &stream)
 gcc_pure
 static uint64_t
 PtsToPcmFrame(uint64_t pts, const AVStream &stream,
-	      const AVCodecContext &codec_context)
+	      const AVCodecContext &codec_context) noexcept
 {
 	return av_rescale_q(pts, stream.time_base, codec_context.time_base);
 }
@@ -437,7 +437,7 @@ ffmpeg_send_packet(DecoderClient &client, InputStream &is,
 
 gcc_const
 static SampleFormat
-ffmpeg_sample_format(enum AVSampleFormat sample_fmt)
+ffmpeg_sample_format(enum AVSampleFormat sample_fmt) noexcept
 {
 	switch (sample_fmt) {
 	case AV_SAMPLE_FMT_S16:

src/decoder/plugins/FlacMetadata.cxx

@@ -67,7 +67,7 @@ flac_parse_mixramp(const FLAC__StreamMetadata_VorbisComment &vc)
  */
 static const char *
 flac_comment_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
-		   const char *name)
+		   const char *name) noexcept
 {
 	return vorbis_comment_value((const char *)entry->entry, name);
 }
@@ -126,7 +126,7 @@ flac_scan_comments(const FLAC__StreamMetadata_VorbisComment *comment,
 
 gcc_pure
 static inline SongTime
-flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info)
+flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info) noexcept
 {
 	assert(stream_info->sample_rate > 0);
 

src/decoder/plugins/GmeDecoderPlugin.cxx

@@ -74,7 +74,7 @@ gme_plugin_init(gcc_unused const ConfigBlock &block)
 
 gcc_pure
 static unsigned
-ParseSubtuneName(const char *base)
+ParseSubtuneName(const char *base) noexcept
 {
 	if (memcmp(base, SUBTUNE_PREFIX, sizeof(SUBTUNE_PREFIX) - 1) != 0)
 		return 0;

src/decoder/plugins/MadDecoderPlugin.cxx

@@ -71,7 +71,7 @@ static bool gapless_playback;
 
 gcc_const
 static SongTime
-ToSongTime(mad_timer_t t)
+ToSongTime(mad_timer_t t) noexcept
 {
 	return SongTime::FromMS(mad_timer_count(t, MAD_UNITS_MILLISECONDS));
 }
@@ -155,10 +155,10 @@ struct MadDecoder {
 	enum mp3_action DecodeNextFrame();
 
 	gcc_pure
-	offset_type ThisFrameOffset() const;
+	offset_type ThisFrameOffset() const noexcept;
 
 	gcc_pure
-	offset_type RestIncludingThisFrame() const;
+	offset_type RestIncludingThisFrame() const noexcept;
 
 	/**
 	 * Attempt to calulcate the length of the song from filesize
@@ -177,7 +177,7 @@ struct MadDecoder {
 	}
 
 	gcc_pure
-	long TimeToFrame(SongTime t) const;
+	long TimeToFrame(SongTime t) const noexcept;
 
 	void UpdateTimerNextFrame();
 
@@ -291,7 +291,7 @@ parse_id3_replay_gain_info(ReplayGainInfo &rgi,
 #ifdef ENABLE_ID3TAG
 gcc_pure
 static MixRampInfo
-parse_id3_mixramp(struct id3_tag *tag)
+parse_id3_mixramp(struct id3_tag *tag) noexcept
 {
 	MixRampInfo result;
 
@@ -710,7 +710,7 @@ mp3_frame_duration(const struct mad_frame *frame)
 }
 
 inline offset_type
-MadDecoder::ThisFrameOffset() const
+MadDecoder::ThisFrameOffset() const noexcept
 {
 	auto offset = input_stream.GetOffset();
 
@@ -723,7 +723,7 @@ MadDecoder::ThisFrameOffset() const
 }
 
 inline offset_type
-MadDecoder::RestIncludingThisFrame() const
+MadDecoder::RestIncludingThisFrame() const noexcept
 {
 	return input_stream.GetSize() - ThisFrameOffset();
 }
@@ -846,7 +846,7 @@ mad_decoder_total_file_time(InputStream &is)
 }
 
 long
-MadDecoder::TimeToFrame(SongTime t) const
+MadDecoder::TimeToFrame(SongTime t) const noexcept
 {
 	unsigned long i;
 

src/decoder/plugins/OpusTags.cxx

@@ -31,7 +31,7 @@
 
 gcc_pure
 static TagType
-ParseOpusTagName(const char *name)
+ParseOpusTagName(const char *name) noexcept
 {
 	TagType type = tag_name_parse_i(name);
 	if (type != TAG_NUM_OF_ITEM_TYPES)

src/decoder/plugins/SidplayDecoderPlugin.cxx

@@ -116,7 +116,7 @@ struct SidplayContainerPath {
 
 gcc_pure
 static unsigned
-ParseSubtuneName(const char *base)
+ParseSubtuneName(const char *base) noexcept
 {
 	if (memcmp(base, SUBTUNE_PREFIX, sizeof(SUBTUNE_PREFIX) - 1) != 0)
 		return 0;
@@ -390,7 +390,7 @@ sidplay_file_decode(DecoderClient &client, Path path_fs)
 
 gcc_pure
 static const char *
-GetInfoString(const SidTuneInfo &info, unsigned i)
+GetInfoString(const SidTuneInfo &info, unsigned i) noexcept
 {
 #ifdef HAVE_SIDPLAYFP
 	return info.numberOfInfoStrings() > i

src/decoder/plugins/SndfileDecoderPlugin.cxx

@@ -148,7 +148,7 @@ sndfile_duration(const SF_INFO &info)
 
 gcc_pure
 static SampleFormat
-sndfile_sample_format(const SF_INFO &info)
+sndfile_sample_format(const SF_INFO &info) noexcept
 {
 	switch (info.format & SF_FORMAT_SUBMASK) {
 	case SF_FORMAT_PCM_S8:

src/decoder/plugins/WavpackDecoderPlugin.cxx

@@ -101,7 +101,7 @@ WavpackOpenInput(WavpackStreamReader *reader, void *wv_id, void *wvc_id,
 
 gcc_pure
 static SignedSongTime
-GetDuration(WavpackContext *wpc)
+GetDuration(WavpackContext *wpc) noexcept
 {
 #ifdef OPEN_DSD_AS_PCM
 	/* libWavPack 5 */

src/event/ServerSocket.cxx

@@ -103,16 +103,16 @@ public:
 	using SocketMonitor::Close;
 
 	gcc_pure
-	std::string ToString() const {
+	std::string ToString() const noexcept {
 		return ::ToString(address);
 	}
 
-	void SetFD(int _fd) {
+	void SetFD(int _fd) noexcept {
 		SocketMonitor::Open(_fd);
 		SocketMonitor::ScheduleRead();
 	}
 
-	void Accept();
+	void Accept() noexcept;
 
 private:
 	virtual bool OnSocketReady(unsigned flags) override;
@@ -146,7 +146,7 @@ get_remote_uid(int fd)
 }
 
 inline void
-OneServerSocket::Accept()
+OneServerSocket::Accept() noexcept
 {
 	StaticSocketAddress peer_address;
 	size_t peer_address_length = sizeof(peer_address);
@@ -343,7 +343,7 @@ ServerSocket::AddPortIPv6(unsigned port)
  */
 gcc_pure
 static bool
-SupportsIPv6()
+SupportsIPv6() noexcept
 {
 	int fd = socket(AF_INET6, SOCK_STREAM, 0);
 	if (fd < 0)

src/filter/FilterRegistry.cxx

@@ -32,7 +32,7 @@ static const FilterPlugin *const filter_plugins[] = {
 };
 
 const FilterPlugin *
-filter_plugin_by_name(const char *name)
+filter_plugin_by_name(const char *name) noexcept
 {
 	for (unsigned i = 0; filter_plugins[i] != nullptr; ++i)
 		if (strcmp(filter_plugins[i]->name, name) == 0)

src/filter/FilterRegistry.hxx

@@ -39,6 +39,6 @@ extern const FilterPlugin volume_filter_plugin;
 
 gcc_pure
 const FilterPlugin *
-filter_plugin_by_name(const char *name);
+filter_plugin_by_name(const char *name) noexcept;
 
 #endif