Verify data table sizes with table_width and assert_table_length macros

This was discussed in #706 It also uncovered some off-by-one issues with defining some constants. A few structs now use rsreset/_RS to define their offset constants, as discussed in #739
2024-11-16 11:27:33 -08:00 · 2021-03-03 22:22:41 -05:00 · 2021-03-03 22:22:41 -05:00 · 40902ffe24
commit 40902ffe24
parent 9c17fb14c8
148 changed files with 608 additions and 237 deletions
--- a/audio/cry_pointers.asm
+++ b/audio/cry_pointers.asm
@ -1,4 +1,6 @@
 Cries:
+; entries correspond to CRY_* constants (see constants/cry_constants.asm)
+	table_width 3, Cries
 	dba Cry_Nidoran_M
 	dba Cry_Nidoran_F
 	dba Cry_Slowpoke
@ -67,3 +69,4 @@ Cries:
 	dba Cry_Aipom
 	dba Cry_Dunsparce
 	dba Cry_Donphan
+	assert_table_length NUM_CRIES
--- a/audio/music_pointers.asm
+++ b/audio/music_pointers.asm
@ -2,6 +2,7 @@

 Music:
 ; entries correspond to MUSIC_* constants
+	table_width 3, Music
 	dba Music_Nothing
 	dba Music_TitleScreen
 	dba Music_Route1
@ -106,3 +107,4 @@ Music:
 	dba Music_SuicuneBattle
 	dba Music_BattleTowerLobby
 	dba Music_MobileCenter
+	assert_table_length NUM_MUSIC_SONGS
--- a/audio/sfx_pointers.asm
+++ b/audio/sfx_pointers.asm
@ -1,5 +1,6 @@
 SFX:
 ; entries correspond to SFX_* constants
+	table_width 3, SFX
 	dba Sfx_DexFanfare5079
 	dba Sfx_Item
 	dba Sfx_CaughtMon
@ -208,3 +209,4 @@ SFX:
 	dba Sfx_TwoPcBeeps
 	dba Sfx_4NoteDitty
 	dba Sfx_Twinkle
+	assert_table_length NUM_SFX
--- a/constants.asm
+++ b/constants.asm
@ -12,7 +12,6 @@ INCLUDE "constants/text_constants.asm"
 INCLUDE "constants/audio_constants.asm"
 INCLUDE "constants/battle_anim_constants.asm"
 INCLUDE "constants/battle_constants.asm"
-INCLUDE "constants/battle_tower_constants.asm"
 INCLUDE "constants/collision_constants.asm"
 INCLUDE "constants/credits_constants.asm"
 INCLUDE "constants/cry_constants.asm"
@ -50,3 +49,4 @@ INCLUDE "constants/tileset_constants.asm"
 INCLUDE "constants/trainer_constants.asm"
 INCLUDE "constants/trainer_data_constants.asm"
 INCLUDE "constants/type_constants.asm"
+INCLUDE "constants/battle_tower_constants.asm"
--- a/constants/audio_constants.asm
+++ b/constants/audio_constants.asm
@ -30,44 +30,45 @@ NUM_NOISE_CHANS EQU const_value - NUM_MUSIC_CHANS
 NUM_CHANNELS EQU const_value

 ; channel_struct members (see macros/wram.asm)
-CHANNEL_MUSIC_ID                    EQUS "(wChannel1MusicID - wChannel1)"
-CHANNEL_MUSIC_BANK                  EQUS "(wChannel1MusicBank - wChannel1)"
-CHANNEL_FLAGS1                      EQUS "(wChannel1Flags1 - wChannel1)"
-CHANNEL_FLAGS2                      EQUS "(wChannel1Flags2 - wChannel1)"
-CHANNEL_FLAGS3                      EQUS "(wChannel1Flags3 - wChannel1)"
-CHANNEL_MUSIC_ADDRESS               EQUS "(wChannel1MusicAddress - wChannel1)"
-CHANNEL_LAST_MUSIC_ADDRESS          EQUS "(wChannel1LastMusicAddress - wChannel1)"
-CHANNEL_NOTE_FLAGS                  EQUS "(wChannel1NoteFlags - wChannel1)"
-CHANNEL_CONDITION                   EQUS "(wChannel1Condition - wChannel1)"
-CHANNEL_DUTY_CYCLE                  EQUS "(wChannel1DutyCycle - wChannel1)"
-CHANNEL_VOLUME_ENVELOPE             EQUS "(wChannel1VolumeEnvelope - wChannel1)"
-CHANNEL_FREQUENCY                   EQUS "(wChannel1Frequency - wChannel1)"
-CHANNEL_PITCH                       EQUS "(wChannel1Pitch - wChannel1)"
-CHANNEL_OCTAVE                      EQUS "(wChannel1Octave - wChannel1)"
-CHANNEL_TRANSPOSITION               EQUS "(wChannel1Transposition - wChannel1)"
-CHANNEL_NOTE_DURATION               EQUS "(wChannel1NoteDuration - wChannel1)"
-CHANNEL_FIELD16                     EQUS "(wChannel1Field16 - wChannel1)"
-CHANNEL_LOOP_COUNT                  EQUS "(wChannel1LoopCount - wChannel1)"
-CHANNEL_TEMPO                       EQUS "(wChannel1Tempo - wChannel1)"
-CHANNEL_TRACKS                      EQUS "(wChannel1Tracks - wChannel1)"
-CHANNEL_DUTY_CYCLE_PATTERN          EQUS "(wChannel1DutyCyclePattern - wChannel1)"
-CHANNEL_VIBRATO_DELAY_COUNT         EQUS "(wChannel1VibratoDelayCount - wChannel1)"
-CHANNEL_VIBRATO_DELAY               EQUS "(wChannel1VibratoDelay - wChannel1)"
-CHANNEL_VIBRATO_EXTENT              EQUS "(wChannel1VibratoExtent - wChannel1)"
-CHANNEL_VIBRATO_RATE                EQUS "(wChannel1VibratoRate - wChannel1)"
-CHANNEL_PITCH_SLIDE_TARGET          EQUS "(wChannel1PitchSlideTarget - wChannel1)"
-CHANNEL_PITCH_SLIDE_AMOUNT          EQUS "(wChannel1PitchSlideAmount - wChannel1)"
-CHANNEL_PITCH_SLIDE_AMOUNT_FRACTION EQUS "(wChannel1PitchSlideAmountFraction - wChannel1)"
-CHANNEL_FIELD25                     EQUS "(wChannel1Field25 - wChannel1)"
-CHANNEL_PITCH_OFFSET                EQUS "(wChannel1PitchOffset - wChannel1)"
-CHANNEL_FIELD29                     EQUS "(wChannel1Field29 - wChannel1)"
-CHANNEL_FIELD2A                     EQUS "(wChannel1Field2a - wChannel1)"
-CHANNEL_FIELD2C                     EQUS "(wChannel1Field2c - wChannel1)"
-CHANNEL_NOTE_LENGTH                 EQUS "(wChannel1NoteLength - wChannel1)"
-CHANNEL_FIELD2E                     EQUS "(wChannel1Field2e - wChannel1)"
-CHANNEL_FIELD2F                     EQUS "(wChannel1Field2f - wChannel1)"
-CHANNEL_FIELD30                     EQUS "(wChannel1Field30 - wChannel1)"
-CHANNEL_STRUCT_LENGTH               EQUS "(wChannel2 - wChannel1)"
+rsreset
+CHANNEL_MUSIC_ID                    rw
+CHANNEL_MUSIC_BANK                  rb
+CHANNEL_FLAGS1                      rb
+CHANNEL_FLAGS2                      rb
+CHANNEL_FLAGS3                      rb
+CHANNEL_MUSIC_ADDRESS               rw
+CHANNEL_LAST_MUSIC_ADDRESS          rw 2
+CHANNEL_NOTE_FLAGS                  rb
+CHANNEL_CONDITION                   rb
+CHANNEL_DUTY_CYCLE                  rb
+CHANNEL_VOLUME_ENVELOPE             rb
+CHANNEL_FREQUENCY                   rw
+CHANNEL_PITCH                       rb
+CHANNEL_OCTAVE                      rb
+CHANNEL_TRANSPOSITION               rb
+CHANNEL_NOTE_DURATION               rb
+CHANNEL_FIELD16                     rb 2
+CHANNEL_LOOP_COUNT                  rb
+CHANNEL_TEMPO                       rw
+CHANNEL_TRACKS                      rb
+CHANNEL_DUTY_CYCLE_PATTERN          rb
+CHANNEL_VIBRATO_DELAY_COUNT         rb
+CHANNEL_VIBRATO_DELAY               rb
+CHANNEL_VIBRATO_EXTENT              rb
+CHANNEL_VIBRATO_RATE                rb
+CHANNEL_PITCH_SLIDE_TARGET          rw
+CHANNEL_PITCH_SLIDE_AMOUNT          rb
+CHANNEL_PITCH_SLIDE_AMOUNT_FRACTION rb
+CHANNEL_FIELD25                     rb 2
+CHANNEL_PITCH_OFFSET                rw
+CHANNEL_FIELD29                     rb
+CHANNEL_FIELD2A                     rw
+CHANNEL_FIELD2C                     rb
+CHANNEL_NOTE_LENGTH                 rb
+CHANNEL_FIELD2E                     rb
+CHANNEL_FIELD2F                     rb
+CHANNEL_FIELD30                     rb 2
+CHANNEL_STRUCT_LENGTH EQU _RS

 NOISE_CHAN_F EQU 2 ; bit set in CHAN5-CHAN7

--- a/constants/battle_anim_constants.asm
+++ b/constants/battle_anim_constants.asm
@ -7,6 +7,7 @@
 	const BATTLEANIMSTRUCT_FUNCTION
 	const BATTLEANIMSTRUCT_PALETTE
 	const BATTLEANIMSTRUCT_TILEID
+BATTLEANIMOBJ_LENGTH EQU const_value - 1 ; discount BATTLEANIMSTRUCT_INDEX
 	const BATTLEANIMSTRUCT_XCOORD
 	const BATTLEANIMSTRUCT_YCOORD
 	const BATTLEANIMSTRUCT_XOFFSET
@ -217,6 +218,7 @@ BATTLEANIM_BASE_TILE EQU 7 * 7  ; Maximum size of a pokemon picture
 	const ANIM_OBJ_PLAYERHEAD_1ROW
 	const ANIM_OBJ_ENEMYFEET_2ROW
 	const ANIM_OBJ_PLAYERHEAD_2ROW
+NUM_ANIM_OBJS EQU const_value

 ; DoBattleAnimFrame arguments (see engine/battle_anims/functions.asm)
 	const_def
@ -300,6 +302,7 @@ BATTLEANIM_BASE_TILE EQU 7 * 7  ; Maximum size of a pokemon picture
 	const BATTLEANIMFUNC_ANCIENT_POWER
 	const BATTLEANIMFUNC_ROCK_SMASH
 	const BATTLEANIMFUNC_COTTON
+NUM_BATTLEANIMFUNCS EQU const_value

 ; BattleAnimFrameData indexes (see data/battle_anims/framesets.asm)
 	const_def
@ -488,6 +491,7 @@ BATTLEANIM_BASE_TILE EQU 7 * 7  ; Maximum size of a pokemon picture
 	const BATTLEANIMFRAMESET_B6
 	const BATTLEANIMFRAMESET_B7
 	const BATTLEANIMFRAMESET_B8
+NUM_BATTLEANIMFRAMESETS EQU const_value

 ; BattleAnimOAMData indexes (see data/battle_anims/oam.asm)
 	const_def
@ -707,6 +711,7 @@ BATTLEANIM_BASE_TILE EQU 7 * 7  ; Maximum size of a pokemon picture
 	const BATTLEANIMOAMSET_D5
 	const BATTLEANIMOAMSET_D6
 	const BATTLEANIMOAMSET_D7
+NUM_BATTLEANIMOAMSETS EQU const_value

 ; BattleBGEffects indexes (see engine/battle_anims/bg_effects.asm)
 	const_def 1
@ -763,6 +768,7 @@ BATTLEANIM_BASE_TILE EQU 7 * 7  ; Maximum size of a pokemon picture
 	const ANIM_BG_VIBRATE_MON
 	const ANIM_BG_WOBBLE_PLAYER
 	const ANIM_BG_WOBBLE_SCREEN
+NUM_ANIM_BGS EQU const_value - 1

 ; wBattleAnimTileDict keys (see wram.asm)
 ; AnimObjGFX indexes (see data/battle_anims/object_gfx.asm)
@ -808,6 +814,7 @@ BATTLEANIM_BASE_TILE EQU 7 * 7  ; Maximum size of a pokemon picture
 	const ANIM_GFX_AEROBLAST
 	const ANIM_GFX_PLAYERHEAD
 	const ANIM_GFX_ENEMYFEET
+NUM_ANIM_GFX EQU const_value - 1

 ; battle_bg_effect struct members (see macros/wram.asm)
 	const_def
--- a/constants/battle_constants.asm
+++ b/constants/battle_constants.asm
@ -120,6 +120,7 @@ SPDSPCDV_SHINY EQU $AA
 	const BATTLE_VARS_LAST_COUNTER_MOVE_OPP
 	const BATTLE_VARS_LAST_MOVE
 	const BATTLE_VARS_LAST_MOVE_OPP
+NUM_BATTLE_VARS EQU const_value

 ; BattleVarLocations indexes (see home/battle.asm)
 	const_def
@ -149,6 +150,8 @@ SPDSPCDV_SHINY EQU $AA
 	const ENEMY_COUNTER_MOVE
 	const PLAYER_LAST_MOVE
 	const ENEMY_LAST_MOVE
+assert const_value % 2 == 0
+NUM_BATTLE_VAR_LOCATION_PAIRS EQU const_value / 2

 ; status condition bit flags
 SLP EQU %111 ; 0-7 turns
--- a/constants/battle_tower_constants.asm
+++ b/constants/battle_tower_constants.asm
@ -5,7 +5,7 @@ BATTLETOWER_NUM_UNIQUE_MON EQU 21
 BATTLETOWER_NUM_UNIQUE_TRAINERS EQU 70

 BATTLETOWER_TRAINERDATALENGTH EQU $24
-BATTLE_TOWER_STRUCT_LENGTH EQUS "(NAME_LENGTH + BATTLETOWER_PARTY_LENGTH * NICKNAMED_MON_STRUCT_LENGTH + BATTLETOWER_TRAINERDATALENGTH)"
+BATTLE_TOWER_STRUCT_LENGTH EQU NAME_LENGTH + BATTLETOWER_PARTY_LENGTH * NICKNAMED_MON_STRUCT_LENGTH + BATTLETOWER_TRAINERDATALENGTH

 ; BattleTowerAction setval arguments (see engine/events/battle_tower/battle_tower.asm)
 	const_def
--- a/constants/credits_constants.asm
+++ b/constants/credits_constants.asm
@ -103,6 +103,7 @@
 	const US_COORDINATION
 	const TEXT_TRANSLATION
 	const PAAD_TESTING
+NUM_CREDITS_STRINGS EQU const_value

 ; CreditsScript indexes (see data/credits_script.asm)
 	const_def -1, -1
--- a/constants/cry_constants.asm
+++ b/constants/cry_constants.asm
@ -72,3 +72,5 @@
 	const CRY_AIPOM
 	const CRY_DUNSPARCE
 	const CRY_DONPHAN
+
+NUM_CRIES EQU const_value
--- a/constants/deco_constants.asm
+++ b/constants/deco_constants.asm
@ -1,3 +1,13 @@
+; decoration attributes
+	const_def
+	const DECOATTR_TYPE
+	const DECOATTR_NAME
+	const DECOATTR_ACTION
+	const DECOATTR_EVENT_FLAG
+	const_skip ; high DECOATTR_EVENT_FLAG byte
+	const DECOATTR_SPRITE
+DECOATTR_STRUCT_LENGTH EQU const_value
+
 ; decoration types
 	const_def 1
 	const DECO_PLANT
@ -6,6 +16,7 @@
 	const DECO_POSTER
 	const DECO_DOLL
 	const DECO_BIGDOLL
+NUM_DECO_TYPES EQU const_value - 1

 ; DecorationNames indexes (see data/decorations/names.asm)
 	const_def 1
@ -51,8 +62,7 @@
 	const PUT_AWAY_BIG_DOLL
 	const SET_UP_DOLL
 	const PUT_AWAY_DOLL
-	const SET_UP_ORNAMENT
-	const PUT_AWAY_ORNAMENT
+NUM_DECO_ACTIONS EQU const_value - 1

 __deco_value__ = 0

@ -127,3 +137,4 @@ NUM_NON_TROPHY_DECOS EQU __deco_value__
 	deco  GOLD_TROPHY_DOLL
 	deco  SILVER_TROPHY_DOLL
 NUM_DECOS EQU __deco_value__
+NUM_DECO_CATEGORIES EQU const_value - 1 - NUM_DECOS
--- a/constants/gfx_constants.asm
+++ b/constants/gfx_constants.asm
@ -6,7 +6,7 @@ NUM_PAL_COLORS EQU 4
 PAL_COLOR_SIZE EQU 2
 PALETTE_SIZE EQU NUM_PAL_COLORS * PAL_COLOR_SIZE

-PALRGB_WHITE EQUS "palred 31 + palgreen 31 + palblue 31" ; $7fff
+PALRGB_WHITE EQU palred 31 + palgreen 31 + palblue 31 ; $7fff

 SCREEN_WIDTH  EQU 20 ; tiles
 SCREEN_HEIGHT EQU 18 ; tiles
--- a/constants/icon_constants.asm
+++ b/constants/icon_constants.asm
@ -39,6 +39,7 @@
 	const ICON_SLOWPOKE
 	const ICON_SUDOWOODO
 	const ICON_BIGMON
+NUM_ICONS EQU const_value - 1

 ; LoadMenuMonIcon.Jumptable indexes (see engine/gfx/mon_icons.asm)
 	const_def
--- a/constants/item_constants.asm
+++ b/constants/item_constants.asm
@ -196,6 +196,7 @@
 	const MUSIC_MAIL   ; bc
 	const MIRAGE_MAIL  ; bd
 	const ITEM_BE      ; be
+NUM_ITEMS EQU const_value - 1

 __tmhm_value__ = 1

--- a/constants/landmark_constants.asm
+++ b/constants/landmark_constants.asm
@ -1,6 +1,5 @@
 ; Landmarks indexes (see data/maps/landmarks.asm)
 	const_def
-
 ; Johto landmarks
 	const LANDMARK_SPECIAL           ; 00
 	const LANDMARK_NEW_BARK_TOWN     ; 01
@ -49,7 +48,6 @@
 	const LANDMARK_DARK_CAVE         ; 2c
 	const LANDMARK_ROUTE_46          ; 2d
 	const LANDMARK_SILVER_CAVE       ; 2e
-
 KANTO_LANDMARK EQU const_value
 	const LANDMARK_PALLET_TOWN       ; 2f
 	const LANDMARK_ROUTE_1           ; 30
@ -100,6 +98,7 @@ KANTO_LANDMARK EQU const_value
 	const LANDMARK_TOHJO_FALLS       ; 5d
 	const LANDMARK_ROUTE_28          ; 5e
 	const LANDMARK_FAST_SHIP         ; 5f
+NUM_LANDMARKS EQU const_value

 ; used in CaughtData
 	const_def $7f, -1
--- a/constants/map_data_constants.asm
+++ b/constants/map_data_constants.asm
@ -50,6 +50,7 @@ NUM_MAP_PALETTES EQU const_value
 	const FISHGROUP_QWILFISH
 	const FISHGROUP_REMORAID
 	const FISHGROUP_QWILFISH_NO_SWARM
+NUM_FISHGROUPS EQU const_value - 1

 ; connection directions (see data/maps/data.asm)
 	const_def
@ -66,8 +67,7 @@ NUM_MAP_PALETTES EQU const_value
 	shift_const NORTH

 ; SpawnPoints indexes (see data/maps/spawn_points.asm)
-	const_def -1
-	const SPAWN_N_A
+	const_def
 	const SPAWN_HOME
 	const SPAWN_DEBUG
 ; kanto
@ -100,6 +100,8 @@ NUM_MAP_PALETTES EQU const_value
 	const SPAWN_FAST_SHIP
 NUM_SPAWNS EQU const_value

+SPAWN_N_A EQU -1
+
 ; Flypoints indexes (see data/maps/flypoints.asm)
 	const_def
 ; johto
--- a/constants/map_object_constants.asm
+++ b/constants/map_object_constants.asm
@ -199,6 +199,7 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const SPRITEMOVEFN_SPIN_COUNTERCLOCKWISE ; 19
 	const SPRITEMOVEFN_BOULDERDUST           ; 1a
 	const SPRITEMOVEFN_GRASS                 ; 1b
+NUM_SPRITEMOVEFN EQU const_value

 ; StepTypesJumptable indexes (see engine/overworld/map_objects.asm)
 	const_def
@ -228,6 +229,7 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const STEP_TYPE_17               ; 17
 	const STEP_TYPE_DELETE           ; 18
 	const STEP_TYPE_SKYFALL_TOP      ; 19
+NUM_STEP_TYPES EQU const_value

 ; ObjectActionPairPointers indexes (see engine/overworld/map_object_action.asm)
 	const_def
@ -248,6 +250,7 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const OBJECT_ACTION_BOULDER_DUST  ; 0e
 	const OBJECT_ACTION_GRASS_SHAKE   ; 0f
 	const OBJECT_ACTION_SKYFALL       ; 10
+NUM_OBJECT_ACTIONS EQU const_value

 ; Facings indexes (see data/sprites/facings.asm)
 	const_def
@ -283,6 +286,7 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const FACING_BOULDER_DUST_2 ; 1d
 	const FACING_GRASS_1        ; 1e
 	const FACING_GRASS_2        ; 1f
+NUM_FACINGS EQU const_value

 ; DoPlayerMovement.DoStep arguments (see engine/overworld/player_movement.asm)
 	const_def
@ -294,3 +298,4 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const STEP_TURN          ; 5
 	const STEP_BACK_LEDGE    ; 6
 	const STEP_WALK_IN_PLACE ; 7
+NUM_STEPS EQU const_value
--- a/constants/menu_constants.asm
+++ b/constants/menu_constants.asm
@ -63,6 +63,7 @@
 	const MONMENUITEM_MOVE       ; 19
 	const MONMENUITEM_MAIL       ; 20
 	const MONMENUITEM_ERROR      ; 21
+NUM_MONMENUITEMS EQU const_value - 1

 ; MonMenuOptions categories
 MONMENU_FIELD_MOVE EQU 0
@ -86,6 +87,7 @@ HMENURETURN_ASM    EQU %11111111
 	const PARTYMENUACTION_GIVE_MON_FEMALE ; unused
 	const PARTYMENUACTION_GIVE_ITEM
 	const PARTYMENUACTION_MOBILE ; mobile
+NUM_PARTYMENUACTIONS EQU const_value
 ; PrintPartyMenuActionText arguments (see engine/pokemon/party_menu.asm)
 	const_next $f0
 	const PARTYMENUTEXT_HEAL_PSN
--- a/constants/move_constants.asm
+++ b/constants/move_constants.asm
@ -285,6 +285,7 @@ NUM_ATTACKS EQU const_value - 1
 	const ANIM_WOBBLE            ; 113
 	const ANIM_SHAKE             ; 114
 	const ANIM_HIT_CONFUSION     ; 115
+NUM_BATTLE_ANIMS EQU const_value - 1

 ; wNumHits uses offsets from ANIM_MISS
 	const_def
--- a/constants/move_effect_constants.asm
+++ b/constants/move_effect_constants.asm
@ -157,3 +157,4 @@
 	const EFFECT_BEAT_UP
 	const EFFECT_FLY
 	const EFFECT_DEFENSE_CURL
+NUM_MOVE_EFECTS EQU const_value
--- a/constants/music_constants.asm
+++ b/constants/music_constants.asm
@ -107,6 +107,7 @@
 	const MUSIC_SUICUNE_BATTLE               ; 64
 	const MUSIC_BATTLE_TOWER_LOBBY           ; 65
 	const MUSIC_MOBILE_CENTER                ; 66
+NUM_MUSIC_SONGS EQU const_value

 ; GetMapMusic picks music for this value (see home/map.asm)
 MUSIC_MAHOGANY_MART EQU $64
--- a/constants/npc_trade_constants.asm
+++ b/constants/npc_trade_constants.asm
@ -1,14 +1,16 @@
 	; npctrade struct members (see data/events/npc_trades.asm)
-NPCTRADE_DIALOG  EQU  0 ; db
-NPCTRADE_GIVEMON EQU  1 ; db
-NPCTRADE_GETMON  EQU  2 ; db
-NPCTRADE_NICK    EQU  3 ; ds MON_NAME_LENGTH
-NPCTRADE_DVS     EQU 14 ; dw
-NPCTRADE_ITEM    EQU 16 ; db
-NPCTRADE_OT_ID   EQU 17 ; dw
-NPCTRADE_OT_NAME EQU 19 ; ds NAME_LENGTH
-NPCTRADE_GENDER  EQU 30 ; db
-NPCTRADE_PADDING EQU 31 ; db
+rsreset
+NPCTRADE_DIALOG  rb
+NPCTRADE_GIVEMON rb
+NPCTRADE_GETMON  rb
+NPCTRADE_NICK    rb MON_NAME_LENGTH
+NPCTRADE_DVS     rw
+NPCTRADE_ITEM    rb
+NPCTRADE_OT_ID   rw
+NPCTRADE_OT_NAME rb NAME_LENGTH
+NPCTRADE_GENDER  rb
+NPCTRADE_PADDING rb
+NPCTRADE_STRUCT_LENGTH EQU _RS

 ; NPCTrades indexes (see data/events/npc_trades.asm)
 	const_def
--- a/constants/phone_constants.asm
+++ b/constants/phone_constants.asm
@ -38,6 +38,7 @@
 	const PHONE_HIKER_PARRY
 	const PHONE_PICNICKER_ERIN
 	const PHONE_BUENA
+NUM_PHONE_CONTACTS EQU const_value - 1

 ; SpecialPhoneCallList indexes (see data/phone/special_calls.asm)
 	const_def
@ -50,6 +51,8 @@
 	const SPECIALCALL_BIKESHOP
 	const SPECIALCALL_WORRIED
 	const SPECIALCALL_MASTERBALL
+NUM_SPECIALCALLS EQU const_value - 1
+SPECIALCALL_SIZE EQU 6

 ; phone struct members
 	const_def
--- a/constants/pokemon_data_constants.asm
+++ b/constants/pokemon_data_constants.asm
@ -1,30 +1,35 @@
 ; base data struct members (see data/pokemon/base_stats/*.asm)
-BASE_DEX_NO      EQUS "(wBaseDexNo - wCurBaseData)"
-BASE_STATS       EQUS "(wBaseStats - wCurBaseData)"
-BASE_HP          EQUS "(wBaseHP - wCurBaseData)"
-BASE_ATK         EQUS "(wBaseAttack - wCurBaseData)"
-BASE_SPD         EQUS "(wBaseSpeed - wCurBaseData)"
-BASE_SAT         EQUS "(wBaseSpecialAttack - wCurBaseData)"
-BASE_SDF         EQUS "(wBaseSpecialDefense - wCurBaseData)"
-BASE_TYPES       EQUS "(wBaseType - wCurBaseData)"
-BASE_TYPE_1      EQUS "(wBaseType1 - wCurBaseData)"
-BASE_TYPE_2      EQUS "(wBaseType2 - wCurBaseData)"
-BASE_CATCH_RATE  EQUS "(wBaseCatchRate - wCurBaseData)"
-BASE_EXP         EQUS "(wBaseExp - wCurBaseData)"
-BASE_ITEMS       EQUS "(wBaseItems - wCurBaseData)"
-BASE_ITEM_1      EQUS "(wBaseItem1 - wCurBaseData)"
-BASE_ITEM_2      EQUS "(wBaseItem2 - wCurBaseData)"
-BASE_GENDER      EQUS "(wBaseGender - wCurBaseData)"
-BASE_UNKNOWN_1   EQUS "(wBaseUnknown1 - wCurBaseData)"
-BASE_EGG_STEPS   EQUS "(wBaseEggSteps - wCurBaseData)"
-BASE_UNKNOWN_2   EQUS "(wBaseUnknown2 - wCurBaseData)"
-BASE_PIC_SIZE    EQUS "(wBasePicSize - wCurBaseData)"
-BASE_FRONTPIC    EQUS "(wBaseUnusedFrontpic - wCurBaseData)"
-BASE_BACKPIC     EQUS "(wBaseUnusedBackpic - wCurBaseData)"
-BASE_GROWTH_RATE EQUS "(wBaseGrowthRate - wCurBaseData)"
-BASE_EGG_GROUPS  EQUS "(wBaseEggGroups - wCurBaseData)"
-BASE_TMHM        EQUS "(wBaseTMHM - wCurBaseData)"
-BASE_DATA_SIZE   EQUS "(wCurBaseDataEnd - wCurBaseData)"
+rsreset
+BASE_DEX_NO      rb
+BASE_STATS       rb NUM_STATS
+rsset BASE_STATS
+BASE_HP          rb
+BASE_ATK         rb
+BASE_DEF         rb
+BASE_SPD         rb
+BASE_SAT         rb
+BASE_SDF         rb
+BASE_TYPES       rw
+rsset BASE_TYPES
+BASE_TYPE_1      rb
+BASE_TYPE_2      rb
+BASE_CATCH_RATE  rb
+BASE_EXP         rb
+BASE_ITEMS       rw
+rsset BASE_ITEMS
+BASE_ITEM_1      rb
+BASE_ITEM_2      rb
+BASE_GENDER      rb
+BASE_UNKNOWN_1   rb
+BASE_EGG_STEPS   rb
+BASE_UNKNOWN_2   rb
+BASE_PIC_SIZE    rb
+BASE_FRONTPIC    rw
+BASE_BACKPIC     rw
+BASE_GROWTH_RATE rb
+BASE_EGG_GROUPS  rb
+BASE_TMHM        rb (NUM_TM_HM_TUTOR + 7) / 8
+BASE_DATA_SIZE EQU _RS

 ; gender ratio constants
 GENDER_F0      EQU   0 percent
@ -67,39 +72,43 @@ GENDER_UNKNOWN EQU -1
 NUM_DEX_ENTRY_BANKS EQU 4

 ; party_struct members (see macros/wram.asm)
-MON_SPECIES            EQUS "(wPartyMon1Species - wPartyMon1)"
-MON_ITEM               EQUS "(wPartyMon1Item - wPartyMon1)"
-MON_MOVES              EQUS "(wPartyMon1Moves - wPartyMon1)"
-MON_ID                 EQUS "(wPartyMon1ID - wPartyMon1)"
-MON_EXP                EQUS "(wPartyMon1Exp - wPartyMon1)"
-MON_STAT_EXP           EQUS "(wPartyMon1StatExp - wPartyMon1)"
-MON_HP_EXP             EQUS "(wPartyMon1HPExp - wPartyMon1)"
-MON_ATK_EXP            EQUS "(wPartyMon1AtkExp - wPartyMon1)"
-MON_DEF_EXP            EQUS "(wPartyMon1DefExp - wPartyMon1)"
-MON_SPD_EXP            EQUS "(wPartyMon1SpdExp - wPartyMon1)"
-MON_SPC_EXP            EQUS "(wPartyMon1SpcExp - wPartyMon1)"
-MON_DVS                EQUS "(wPartyMon1DVs - wPartyMon1)"
-MON_PP                 EQUS "(wPartyMon1PP - wPartyMon1)"
-MON_HAPPINESS          EQUS "(wPartyMon1Happiness - wPartyMon1)"
-MON_PKRUS              EQUS "(wPartyMon1PokerusStatus - wPartyMon1)"
-MON_CAUGHTDATA         EQUS "(wPartyMon1CaughtData - wPartyMon1)"
-MON_CAUGHTLEVEL        EQUS "(wPartyMon1CaughtLevel - wPartyMon1)"
-MON_CAUGHTTIME         EQUS "(wPartyMon1CaughtTime - wPartyMon1)"
-MON_CAUGHTGENDER       EQUS "(wPartyMon1CaughtGender - wPartyMon1)"
-MON_CAUGHTLOCATION     EQUS "(wPartyMon1CaughtLocation - wPartyMon1)"
-MON_LEVEL              EQUS "(wPartyMon1Level - wPartyMon1)"
-MON_STATUS             EQUS "(wPartyMon1Status - wPartyMon1)"
-MON_HP                 EQUS "(wPartyMon1HP - wPartyMon1)"
-MON_MAXHP              EQUS "(wPartyMon1MaxHP - wPartyMon1)"
-MON_ATK                EQUS "(wPartyMon1Attack - wPartyMon1)"
-MON_DEF                EQUS "(wPartyMon1Defense - wPartyMon1)"
-MON_SPD                EQUS "(wPartyMon1Speed - wPartyMon1)"
-MON_SAT                EQUS "(wPartyMon1SpclAtk - wPartyMon1)"
-MON_SDF                EQUS "(wPartyMon1SpclDef - wPartyMon1)"
-BOXMON_STRUCT_LENGTH   EQUS "(wPartyMon1BoxEnd - wPartyMon1)"
-PARTYMON_STRUCT_LENGTH EQUS "(wPartyMon1StructEnd - wPartyMon1)"
+rsreset
+MON_SPECIES            rb
+MON_ITEM               rb
+MON_MOVES              rb NUM_MOVES
+MON_ID                 rw
+MON_EXP                rb 3
+MON_STAT_EXP           rw NUM_EXP_STATS
+rsset MON_STAT_EXP
+MON_HP_EXP             rw
+MON_ATK_EXP            rw
+MON_DEF_EXP            rw
+MON_SPD_EXP            rw
+MON_SPC_EXP            rw
+MON_DVS                rw
+MON_PP                 rb NUM_MOVES
+MON_HAPPINESS          rb
+MON_PKRUS              rb
+MON_CAUGHTDATA         rw
+rsset MON_CAUGHTDATA
+MON_CAUGHTTIME         rb
+MON_CAUGHTGENDER       rb
+rsset MON_CAUGHTDATA
+MON_CAUGHTLEVEL        rb
+MON_CAUGHTLOCATION     rb
+MON_LEVEL              rb
+BOXMON_STRUCT_LENGTH EQU _RS
+MON_STATUS             rb 2
+MON_HP                 rw
+MON_MAXHP              rw
+MON_ATK                rw
+MON_DEF                rw
+MON_SPD                rw
+MON_SAT                rw
+MON_SDF                rw
+PARTYMON_STRUCT_LENGTH EQU _RS

-NICKNAMED_MON_STRUCT_LENGTH EQUS "(PARTYMON_STRUCT_LENGTH + MON_NAME_LENGTH)"
+NICKNAMED_MON_STRUCT_LENGTH EQU PARTYMON_STRUCT_LENGTH + MON_NAME_LENGTH
 REDMON_STRUCT_LENGTH EQU 44

 ; caught data
@ -116,6 +125,8 @@ CAUGHT_BY_BOY     EQU 2

 CAUGHT_EGG_LEVEL EQU 1

+MON_CRY_LENGTH EQU 6
+
 ; maximum number of party pokemon
 PARTY_LENGTH EQU 6

@ -199,6 +210,7 @@ NUM_TREEMON_SETS EQU const_value
 	const HAPPINESS_REVIVALHERB       ; 11
 	const HAPPINESS_GROOMING          ; 12
 	const HAPPINESS_GAINLEVELATHOME   ; 13
+NUM_HAPPINESS_CHANGES EQU const_value - 1

 ; significant happiness values
 BASE_HAPPINESS        EQU 70
--- a/constants/radio_constants.asm
+++ b/constants/radio_constants.asm
@ -15,6 +15,7 @@
 	const POKE_FLUTE_RADIO       ; 08
 	const UNOWN_RADIO            ; 09
 	const EVOLUTION_RADIO        ; 0a
+NUM_RADIO_CHANNELS EQU const_value
 ; internal indexes for channel segments
 	const OAKS_POKEMON_TALK_2    ; 0b
 	const OAKS_POKEMON_TALK_3    ; 0c
@ -93,6 +94,7 @@
 	const POKEDEX_SHOW_6         ; 55
 	const POKEDEX_SHOW_7         ; 56
 	const POKEDEX_SHOW_8         ; 57
+NUM_RADIO_SEGMENTS EQU const_value

 ; PlayRadio.StationPointers indexes (see engine/pokegear/pokegear.asm)
 	const_def
@ -106,9 +108,6 @@
 	const MAPRADIO_LETS_ALL_SING
 	const MAPRADIO_ROCKET

-; OaksPKMNTalkRoutes size (see data/radio/oaks_pkmn_talk_routes.asm)
-NUM_OAKS_POKEMON_TALK_ROUTES EQU 15
-
 ; These tables in engine/pokegear/radio.asm are all sized to a power of 2
 ; so there's no need for a rejection sampling loop
 NUM_OAKS_POKEMON_TALK_ADVERBS    EQU 16 ; OaksPKMNTalk8.Adverbs
--- a/constants/script_constants.asm
+++ b/constants/script_constants.asm
@ -175,6 +175,7 @@ NUM_CMDQUEUE_TYPES EQU const_value
 	const FLOOR_10F
 	const FLOOR_11F
 	const FLOOR_ROOF
+NUM_FLOORS EQU const_value

 ; showemote arguments
 ; Emotes indexes (see data/sprites/emotes.asm)
@ -191,7 +192,9 @@ NUM_CMDQUEUE_TYPES EQU const_value
 	const EMOTE_ROD ; 9
 	const EMOTE_BOULDER_DUST ; 10
 	const EMOTE_GRASS_RUSTLE ; 11
+NUM_EMOTES EQU const_value
 EMOTE_FROM_MEM EQU -1
+EMOTE_LENGTH EQU 6

 ; fruittree arguments
 ; FruitTreeItems indexes (see data/items/fruit_trees.asm)
@ -236,6 +239,7 @@ NUM_FRUIT_TREES EQU const_value - 1
 	const DECODESC_RIGHT_DOLL ; 2
 	const DECODESC_BIG_DOLL   ; 3
 	const DECODESC_CONSOLE    ; 4
+NUM_DECODESCS EQU const_value

 ; swarm arguments
 ; StoreSwarmMapIndices arguments
--- a/constants/sfx_constants.asm
+++ b/constants/sfx_constants.asm
@ -210,3 +210,5 @@
 	const SFX_TWO_PC_BEEPS                ; cc
 	const SFX_4_NOTE_DITTY                ; cd
 	const SFX_TWINKLE                     ; ce
+
+NUM_SFX EQU const_value
--- a/constants/sprite_anim_constants.asm
+++ b/constants/sprite_anim_constants.asm
@ -79,6 +79,7 @@ NUM_SPRITEANIMDICT_ENTRIES EQU 10
 	const SPRITE_ANIM_INDEX_INTRO_UNOWN_F             ; 2a
 	const SPRITE_ANIM_INDEX_INTRO_SUICUNE_AWAY        ; 2b
 	const SPRITE_ANIM_INDEX_CELEBI                    ; 2c
+NUM_SPRITE_ANIM_INDEXES EQU const_value

 ; DoAnimFrame.Jumptable indexes (see engine/gfx/sprite_anims.asm)
 	const_def
@ -117,6 +118,7 @@ NUM_SPRITEANIMDICT_ENTRIES EQU 10
 	const SPRITE_ANIM_SEQ_INTRO_UNOWN               ; 20
 	const SPRITE_ANIM_SEQ_INTRO_UNOWN_F             ; 21
 	const SPRITE_ANIM_SEQ_INTRO_SUICUNE_AWAY        ; 22
+NUM_SPRITE_ANIM_SEQS EQU const_value

 ; SpriteAnimFrameData indexes (see data/sprite_anims/framesets.asm)
 	const_def
@ -186,6 +188,7 @@ NUM_SPRITEANIMDICT_ENTRIES EQU 10
 	const SPRITE_ANIM_FRAMESET_INTRO_UNOWN_F             ; 3f
 	const SPRITE_ANIM_FRAMESET_CELEBI_LEFT               ; 40
 	const SPRITE_ANIM_FRAMESET_CELEBI_RIGHT              ; 41
+NUM_SPRITE_ANIM_FRAMESETS EQU const_value

 ; SpriteAnimOAMData indexes (see data/sprite_anims/oam.asm)
 	const_def
@ -329,3 +332,4 @@ NUM_SPRITEANIMDICT_ENTRIES EQU 10
 	const SPRITE_ANIM_OAMSET_GAMEFREAK_LOGO_9            ; 89
 	const SPRITE_ANIM_OAMSET_GAMEFREAK_LOGO_10           ; 8a
 	const SPRITE_ANIM_OAMSET_GAMEFREAK_LOGO_11           ; 8b
+NUM_SPRITE_ANIM_OAMSETS EQU const_value
--- a/constants/sprite_constants.asm
+++ b/constants/sprite_constants.asm
@ -104,6 +104,7 @@
 	const SPRITE_ENTEI ; 64
 	const SPRITE_RAIKOU ; 65
 	const SPRITE_STANDING_YOUNGSTER ; 66
+NUM_OVERWORLD_SPRITES EQU const_value - 1

 ; SpriteMons indexes (see data/sprites/sprite_mons.asm)
 	const_next $80
@ -143,6 +144,7 @@ SPRITE_POKEMON EQU const_value
 	const SPRITE_GYARADOS ; a0
 	const SPRITE_LUGIA ; a1
 	const SPRITE_HO_OH ; a2
+NUM_POKEMON_SPRITES EQU const_value - SPRITE_POKEMON

 ; special GetMonSprite values (see engine/overworld/overworld.asm)
 	const_next $e0
--- a/constants/tileset_constants.asm
+++ b/constants/tileset_constants.asm
@ -36,6 +36,13 @@
 	const TILESET_KABUTO_WORD_ROOM     ; 22
 	const TILESET_OMANYTE_WORD_ROOM    ; 23
 	const TILESET_AERODACTYL_WORD_ROOM ; 24
+NUM_TILESETS EQU const_value - 1
+
+; wTileset struct size
+TILESET_LENGTH EQU 15
+
+; roof length (see gfx/tilesets/roofs)
+ROOF_LENGTH EQU 9

 ; bg palette values (see gfx/tilesets/*_palette_map.asm)
 ; TilesetBGPalette indexes (see gfx/tilesets/bg_tiles.pal)
--- a/constants/trainer_constants.asm
+++ b/constants/trainer_constants.asm
@ -25,6 +25,7 @@ CHRIS EQU __trainer_class__
 	const PHONECONTACT_BILL
 	const PHONECONTACT_ELM
 	const PHONECONTACT_BUENA
+NUM_NONTRAINER_PHONECONTACTS EQU const_value - 1

 KRIS EQU __trainer_class__
 	trainerclass FALKNER ; 1
@ -702,4 +703,4 @@ KRIS EQU __trainer_class__
 	trainerclass MYSTICALMAN ; 43
 	const EUSINE

-NUM_TRAINER_CLASSES EQU __trainer_class__
+NUM_TRAINER_CLASSES EQU __trainer_class__ - 1
--- a/constants/type_constants.asm
+++ b/constants/type_constants.asm
@ -34,4 +34,6 @@ SPECIAL EQU const_value
 	const DARK
 TYPES_END EQU const_value

-NUM_TYPES EQU TYPES_END + UNUSED_TYPES - UNUSED_TYPES_END
+NUM_TYPES EQU TYPES_END + UNUSED_TYPES - UNUSED_TYPES_END - 1 ; discount BIRD
+
+POKEDEX_TYPE_STRING_LENGTH EQU 9
--- a/data/battle/effect_command_pointers.asm
+++ b/data/battle/effect_command_pointers.asm
@ -4,6 +4,7 @@

 BattleCommandPointers:
 ; entries correspond to macros/scripts/battle_commands.asm
+	table_width 2, BattleCommandPointers
 	dw BattleCommand_CheckTurn
 	dw BattleCommand_CheckObedience
 	dw BattleCommand_UsedMoveText
@ -179,3 +180,4 @@ BattleCommandPointers:
 	dw BattleCommand_SuperEffectiveLoopText
 	dw BattleCommand_StartLoop
 	dw BattleCommand_Curl
+	assert_table_length NUM_EFFECT_COMMANDS
--- a/data/battle_anims/framesets.asm
+++ b/data/battle_anims/framesets.asm
@ -1,5 +1,6 @@
 BattleAnimFrameData:
 ; entries correspond to BATTLEANIMFRAMESET_* constants
+	table_width 2, BattleAnimFrameData
 	dw .Frameset_00 ; BATTLEANIMFRAMESET_00
 	dw .Frameset_01 ; BATTLEANIMFRAMESET_01
 	dw .Frameset_02 ; BATTLEANIMFRAMESET_02
@ -185,6 +186,7 @@ BattleAnimFrameData:
 	dw .Frameset_b6 ; BATTLEANIMFRAMESET_B6
 	dw .Frameset_b7 ; BATTLEANIMFRAMESET_B7
 	dw .Frameset_b8 ; BATTLEANIMFRAMESET_B8
+	assert_table_length NUM_BATTLEANIMFRAMESETS

 .Frameset_00:
 	frame BATTLEANIMOAMSET_00,  6
--- a/data/battle_anims/oam.asm
+++ b/data/battle_anims/oam.asm
@ -1,5 +1,6 @@
 BattleAnimOAMData:
 ; entries correspond to BATTLEANIMOAMSET_* constants
+	table_width 4, BattleAnimOAMData
 	; vtile offset, data length, data pointer
 	dbbw $00, 16, .OAMData_00 ; BATTLEANIMOAMSET_00
 	dbbw $04,  9, .OAMData_01 ; BATTLEANIMOAMSET_01
@ -217,6 +218,7 @@ BattleAnimOAMData:
 	dbbw $00,  6, .OAMData_d5 ; BATTLEANIMOAMSET_D5
 	dbbw $00, 14, .OAMData_d6 ; BATTLEANIMOAMSET_D6
 	dbbw $00, 12, .OAMData_d7 ; BATTLEANIMOAMSET_D7
+	assert_table_length NUM_BATTLEANIMOAMSETS

 .OAMData_11:
 	dbsprite  -1,  -1, 4, 0, $00, $0
--- a/data/battle_anims/object_gfx.asm
+++ b/data/battle_anims/object_gfx.asm
@ -6,6 +6,7 @@ ENDM

 AnimObjGFX:
 ; entries correspond to ANIM_GFX_* constants
+	table_width 4, AnimObjGFX
 	anim_obj_gfx  0, AnimObj00GFX
 	anim_obj_gfx 21, AnimObjHitGFX
 	anim_obj_gfx  6, AnimObjCutGFX
@ -48,3 +49,4 @@ AnimObjGFX:
 	anim_obj_gfx 24, AnimObjAeroblastGFX
 	anim_obj_gfx  1, NULL
 	anim_obj_gfx  1, NULL
+	assert_table_length NUM_ANIM_GFX + 1
--- a/data/battle_anims/objects.asm
+++ b/data/battle_anims/objects.asm
@ -18,6 +18,7 @@ ENDM

 BattleAnimObjects:
 ; entries correspond to ANIM_OBJ_* constants
+	table_width BATTLEANIMOBJ_LENGTH, BattleAnimObjects
 ; ANIM_OBJ_HIT_BIG_YFIX
 	battleanimobj RELATIVE_X, $ff, BATTLEANIMFRAMESET_00, BATTLEANIMFUNC_NULL, PAL_BATTLE_OB_GRAY, ANIM_GFX_HIT
 ; ANIM_OBJ_HIT_YFIX
@ -394,3 +395,4 @@ BattleAnimObjects:
 	battleanimobj ABSOLUTE_X, $00, BATTLEANIMFRAMESET_B7, BATTLEANIMFUNC_NULL, PAL_BATTLE_OB_ENEMY, ANIM_GFX_PLAYERHEAD
 ; ANIM_OBJ_PLAYERHEAD_2ROW
 	battleanimobj ABSOLUTE_X, $00, BATTLEANIMFRAMESET_B8, BATTLEANIMFUNC_NULL, PAL_BATTLE_OB_PLAYER, ANIM_GFX_ENEMYFEET
+	assert_table_length NUM_ANIM_OBJS
--- a/data/battle_tower/classes.asm
+++ b/data/battle_tower/classes.asm
@ -2,6 +2,8 @@ BattleTowerTrainers:
 ; The trainer class is not used in Crystal 1.0 due to a bug.
 ; Instead, the sixth character in the trainer's name is used.
 ; See BattleTowerText in engine/events/battle_tower/trainer_text.asm.
+	table_width (NAME_LENGTH - 1) + 1, BattleTowerTrainers
+	; name, class
 	db "HANSON@@@@", FISHER
 	db "SAWYER@@@@", POKEMANIAC
 	db "MASUDA@@@@", GUITARIST
@ -23,6 +25,7 @@ BattleTowerTrainers:
 	db "KAUFMAN@@@", SWIMMERM
 	db "LANCASTER@", SKIER
 	db "McMAHILL@@", CAMPER
+	assert_table_length BATTLETOWER_NUM_UNIQUE_MON
 ; The following can only be sampled in Crystal 1.1.
 	db "OBRIEN@@@@", GENTLEMAN
 	db "FROST@@@@@", BEAUTY
@ -73,3 +76,4 @@ BattleTowerTrainers:
 	db "DYKSTRA@@@", SWIMMERF
 	db "EATON@@@@@", BIKER
 	db "WONG@@@@@@", FIREBREATHER
+	assert_table_length BATTLETOWER_NUM_UNIQUE_TRAINERS
--- a/data/battle_tower/parties.asm
+++ b/data/battle_tower/parties.asm
@ -1,5 +1,6 @@
 BattleTowerMons:
 ; 10 groups (one per floor level) of 21 mons (BATTLETOWER_NUM_UNIQUE_MON).
+	table_width NICKNAMED_MON_STRUCT_LENGTH, BattleTowerMons

 ; BattleTowerMons group 1

@ -5489,3 +5490,5 @@ BattleTowerMons:
 	bigdw 214 ; SAtk
 	bigdw 214 ; SDef
 	db "RANTA-N@@@@"
+
+	assert_table_length 10 * BATTLETOWER_NUM_UNIQUE_MON
--- a/data/battle_tower/unknown.asm
+++ b/data/battle_tower/unknown.asm
@ -1,6 +1,7 @@
 BattleTowerTrainerData:: ; ???
 ; 70 tables (BATTLETOWER_NUM_UNIQUE_TRAINERS) of 18 two-argument entries (total size BATTLETOWER_TRAINERDATALENGTH).
 ; Second argument points to an entry in Unknown_170470, to which the first argument is compared.
+	table_width BATTLETOWER_TRAINERDATALENGTH, BattleTowerTrainerData

 ; BattleTowerTrainerData table 1:
 	db $37,  3
@ -1401,3 +1402,5 @@ BattleTowerTrainerData:: ; ???
 	db $22,  7
 	db $d1,  0
 	db $32, 13
+
+	assert_table_length BATTLETOWER_NUM_UNIQUE_TRAINERS
--- a/data/collision/collision_permissions.asm
+++ b/data/collision/collision_permissions.asm
@ -1,5 +1,6 @@
 TileCollisionTable::
 ; entries correspond to COLL_* constants
+	table_width 1, TileCollisionTable
 	db LAND_TILE         ; COLL_FLOOR
 	db LAND_TILE         ; COLL_01
 	db LAND_TILE         ; 02
@ -256,3 +257,4 @@ TileCollisionTable::
 	db LAND_TILE         ; fd
 	db LAND_TILE         ; fe
 	db WALL_TILE         ; COLL_FF
+	assert_table_length $100
--- a/data/credits_strings.asm
+++ b/data/credits_strings.asm
@ -1,5 +1,6 @@
 CreditsStringsPointers:
 ; entries correspond to constants/credits_constants.asm
+	table_width 2, CreditsStringsPointers
 	dw .SatoshiTajiri
 	dw .JunichiMasuda
 	dw .TetsuyaWatanabe
@ -103,6 +104,7 @@ CreditsStringsPointers:
 	dw .UsCoordination
 	dw .TextTranslation
 	dw .PaadTesting
+	assert_table_length NUM_CREDITS_STRINGS

 .SatoshiTajiri:       db "   SATOSHI TAJIRI@"         ; "たじり　さとし@"
 .JunichiMasuda:       db "   JUNICHI MASUDA@"         ; "ますだ　じゅんいち@"
--- a/data/decorations/attributes.asm
+++ b/data/decorations/attributes.asm
@ -1,5 +1,5 @@
 decoration: MACRO
-	; type, name, command, event flag, tile/sprite
+	; type, name, action, event flag, tile/sprite
 	db \1, \2, \3
 	dw \4
 	db \5
@ -7,6 +7,7 @@ ENDM

 DecorationAttributes:
 ; entries correspond to deco constants
+	table_width DECOATTR_STRUCT_LENGTH, DecorationAttributes
 	decoration DECO_PLANT,   0,               0,                 EVENT_TEMPORARY_UNTIL_MAP_RELOAD_1, 0
 	decoration DECO_PLANT,   PUT_IT_AWAY,     PUT_AWAY_BED,      EVENT_TEMPORARY_UNTIL_MAP_RELOAD_1, 0
 	decoration DECO_BED,     FEATHERY_BED,    SET_UP_BED,        EVENT_DECO_BED_1,                   $1b
@ -60,3 +61,4 @@ DecorationAttributes:
 	decoration DECO_DOLL,    TENTACOOL,       SET_UP_DOLL,       EVENT_DECO_TENTACOOL_DOLL,          SPRITE_TENTACOOL
 	decoration DECO_PLANT,   GOLD_TROPHY,     SET_UP_DOLL,       EVENT_DECO_GOLD_TROPHY,             SPRITE_GOLD_TROPHY
 	decoration DECO_PLANT,   SILVER_TROPHY,   SET_UP_DOLL,       EVENT_DECO_SILVER_TROPHY,           SPRITE_SILVER_TROPHY
+	assert_table_length NUM_DECOS + NUM_DECO_CATEGORIES + 1
--- a/data/decorations/decorations.asm
+++ b/data/decorations/decorations.asm
@ -1,5 +1,7 @@
 DecorationIDs:
 ; see constants/deco_constants.asm
+	table_width 1, DecorationIDs
+
 	db DECO_FEATHERY_BED ; 2
 	db DECO_PINK_BED ; 3
 	db DECO_POLKADOT_BED ; 4
@ -52,4 +54,5 @@ DecorationIDs:
 	db DECO_GOLD_TROPHY_DOLL ; 33
 	db DECO_SILVER_TROPHY_DOLL ; 34

+	assert_table_length NUM_DECOS
 	db -1 ; end
--- a/data/default_options.asm
+++ b/data/default_options.asm
@ -14,3 +14,5 @@ DefaultOptions:

 	db $00
 	db $00
+.End
+	assert DefaultOptions.End - DefaultOptions == wOptionsEnd - wOptions
--- a/data/events/bug_contest_flags.asm
+++ b/data/events/bug_contest_flags.asm
@ -1,5 +1,5 @@
 BugCatchingContestantEventFlagTable:
-; there are NUM_BUG_CONTESTANTS entries
+	table_width 2, BugCatchingContestantEventFlagTable
 	dw EVENT_BUG_CATCHING_CONTESTANT_1A
 	dw EVENT_BUG_CATCHING_CONTESTANT_2A
 	dw EVENT_BUG_CATCHING_CONTESTANT_3A
@ -10,3 +10,4 @@ BugCatchingContestantEventFlagTable:
 	dw EVENT_BUG_CATCHING_CONTESTANT_8A
 	dw EVENT_BUG_CATCHING_CONTESTANT_9A
 	dw EVENT_BUG_CATCHING_CONTESTANT_10A
+	assert_table_length NUM_BUG_CONTESTANTS
--- a/data/events/bug_contest_winners.asm
+++ b/data/events/bug_contest_winners.asm
@ -1,5 +1,5 @@
 BugContestantPointers:
-; there are NUM_BUG_CONTESTANTS + 1 entries
+	table_width 2, BugContestantPointers
 	dw BugContestant_BugCatcherDon ; this reverts back to the player
 	dw BugContestant_BugCatcherDon
 	dw BugContestant_BugCatcherEd
@ -11,6 +11,7 @@ BugContestantPointers:
 	dw BugContestant_BugCatcherJosh
 	dw BugContestant_YoungsterSamuel
 	dw BugContestant_SchoolboyKipp
+	assert_table_length NUM_BUG_CONTESTANTS + 1

 ; contestant format:
 ;   db class, id
--- a/data/events/elevator_floors.asm
+++ b/data/events/elevator_floors.asm
@ -1,5 +1,6 @@
 ElevatorFloorNames:
 ; entries correspond to FLOOR_* constants
+	table_width 2, ElevatorFloorNames
 	dw .B4F
 	dw .B3F
 	dw .B2F
@ -16,6 +17,7 @@ ElevatorFloorNames:
 	dw ._10F
 	dw ._11F
 	dw .ROOF
+	assert_table_length NUM_FLOORS

 .B4F:  db "B4F@"
 .B3F:  db "B3F@"
--- a/data/events/engine_flags.asm
+++ b/data/events/engine_flags.asm
@ -6,6 +6,7 @@ ENDM

 EngineFlags:
 ; entries correspond to ENGINE_* constants
+	table_width 3, EngineFlags

 	; pokegear
 	engine_flag wPokegearFlags, POKEGEAR_RADIO_CARD_F
@ -197,3 +198,5 @@ EngineFlags:

 	engine_flag wSwarmFlags, SWARMFLAGS_DUNSPARCE_SWARM_F
 	engine_flag wSwarmFlags, SWARMFLAGS_YANMA_SWARM_F
+
+	assert_table_length NUM_ENGINE_FLAGS
--- a/data/events/happiness_changes.asm
+++ b/data/events/happiness_changes.asm
@ -1,6 +1,7 @@
 HappinessChanges:
 ; entries correspond to HAPPINESS_* constants
-; change if happiness < 100, change if happiness < 200, change otherwise
+	table_width 3, HappinessChanges
+	; change if happiness < 100, change if happiness < 200, change otherwise
 	db  +5,  +3,  +2 ; Gained a level
 	db  +5,  +3,  +2 ; Vitamin
 	db  +1,  +1,  +0 ; X Item
@ -20,3 +21,4 @@ HappinessChanges:
 	db -15, -15, -20 ; Used Revival Herb (bitter)
 	db  +3,  +3,  +1 ; Grooming
 	db +10,  +6,  +4 ; Gained a level in the place where it was caught
+	assert_table_length NUM_HAPPINESS_CHANGES
--- a/data/events/npc_trades.asm
+++ b/data/events/npc_trades.asm
@ -8,6 +8,7 @@ ENDM

 NPCTrades:
 ; entries correspond to NPCTRADE_* constants
+	table_width NPCTRADE_STRUCT_LENGTH, NPCTrades
 	npctrade TRADE_DIALOGSET_COLLECTOR, ABRA,       MACHOP,     "MUSCLE@@@@@", $37, $66, GOLD_BERRY,   37460, "MIKE@@@@@@@", TRADE_GENDER_EITHER
 	npctrade TRADE_DIALOGSET_COLLECTOR, BELLSPROUT, ONIX,       "ROCKY@@@@@@", $96, $66, BITTER_BERRY, 48926, "KYLE@@@@@@@", TRADE_GENDER_EITHER
 	npctrade TRADE_DIALOGSET_HAPPY,     KRABBY,     VOLTORB,    "VOLTY@@@@@@", $98, $88, PRZCUREBERRY, 29189, "TIM@@@@@@@@", TRADE_GENDER_EITHER
@ -15,3 +16,4 @@ NPCTrades:
 	npctrade TRADE_DIALOGSET_NEWBIE,    HAUNTER,    XATU,       "PAUL@@@@@@@", $96, $86, MYSTERYBERRY, 15616, "CHRIS@@@@@@", TRADE_GENDER_EITHER
 	npctrade TRADE_DIALOGSET_GIRL,      CHANSEY,    AERODACTYL, "AEROY@@@@@@", $96, $66, GOLD_BERRY,   26491, "KIM@@@@@@@@", TRADE_GENDER_EITHER
 	npctrade TRADE_DIALOGSET_COLLECTOR, DUGTRIO,    MAGNETON,   "MAGGIE@@@@@", $96, $66, METAL_COAT,   50082, "FOREST@@@@@", TRADE_GENDER_EITHER
+	assert_table_length NUM_NPC_TRADES
--- a/data/events/odd_eggs.asm
+++ b/data/events/odd_eggs.asm
@ -1,9 +1,12 @@
+NUM_ODD_EGGS EQU 14
+
 prob: MACRO
 prob_total = prob_total + (\1)
 	dw prob_total * $ffff / 100
 ENDM

 OddEggProbabilities:
+	table_width 2, OddEggProbabilities
 prob_total = 0
 ; Pichu
 	prob 8
@ -26,8 +29,10 @@ prob_total = 0
 ; Tyrogue
 	prob 10
 	prob 1
+	assert_table_length NUM_ODD_EGGS

 OddEggs:
+	table_width NICKNAMED_MON_STRUCT_LENGTH, OddEggs

 	db PICHU
 	db NO_ITEM
@ -392,3 +397,5 @@ OddEggs:
 	bigdw 9 ; SAtk
 	bigdw 9 ; SDef
 	db "EGG@@@@@@@@"
+
+	assert_table_length NUM_ODD_EGGS
--- a/data/icon_pointers.asm
+++ b/data/icon_pointers.asm
@ -1,5 +1,6 @@
 IconPointers:
-; entries correspond to ICON_* constants
+; entries correspond to ICON_* constants (see constants/icon_constants.asm)
+	table_width 2, IconPointers
 	dw NullIcon
 	dw PoliwagIcon
 	dw JigglypuffIcon
@ -39,3 +40,4 @@ IconPointers:
 	dw SlowpokeIcon
 	dw SudowoodoIcon
 	dw BigmonIcon
+	assert_table_length NUM_ICONS + 1
--- a/data/items/attributes.asm
+++ b/data/items/attributes.asm
@ -6,7 +6,8 @@ item_attribute: MACRO
 ENDM

 ItemAttributes:
-; entries correspond to item ids
+; entries correspond to item ids (see constants/item_constants.asm)
+	table_width ITEMATTR_STRUCT_LENGTH, ItemAttributes
 ; MASTER_BALL
 	item_attribute 0, HELD_NONE, 0, CANT_SELECT, BALL, ITEMMENU_NOUSE, ITEMMENU_CLOSE
 ; ULTRA_BALL
@ -387,6 +388,7 @@ ItemAttributes:
 	item_attribute 50, HELD_NONE, 0, CANT_SELECT, ITEM, ITEMMENU_NOUSE, ITEMMENU_NOUSE
 ; ITEM_BE
 	item_attribute $9999, HELD_NONE, 0, NO_LIMITS, ITEM, ITEMMENU_NOUSE, ITEMMENU_NOUSE
+	assert_table_length NUM_ITEMS
 ; TM01
 	item_attribute 3000, HELD_NONE, 0, CANT_SELECT, TM_HM, ITEMMENU_PARTY, ITEMMENU_NOUSE
 ; TM02
@ -491,6 +493,7 @@ ItemAttributes:
 	item_attribute 3000, HELD_NONE, 0, CANT_SELECT, TM_HM, ITEMMENU_PARTY, ITEMMENU_NOUSE
 ; TM50
 	item_attribute 2000, HELD_NONE, 0, CANT_SELECT, TM_HM, ITEMMENU_PARTY, ITEMMENU_NOUSE
+	assert_table_length NUM_ITEMS + NUM_TMS + 2 ; count ITEM_C3 and ITEM_DC
 ; HM01
 	item_attribute 0, HELD_NONE, 0, CANT_SELECT | CANT_TOSS, TM_HM, ITEMMENU_PARTY, ITEMMENU_NOUSE
 ; HM02
@ -505,6 +508,7 @@ ItemAttributes:
 	item_attribute 0, HELD_NONE, 0, CANT_SELECT | CANT_TOSS, TM_HM, ITEMMENU_PARTY, ITEMMENU_NOUSE
 ; HM07
 	item_attribute 0, HELD_NONE, 0, CANT_SELECT | CANT_TOSS, TM_HM, ITEMMENU_PARTY, ITEMMENU_NOUSE
+	assert_table_length NUM_ITEMS + NUM_TMS + 2 + NUM_HMS ; count ITEM_C3 and ITEM_DC
 ; ITEM_FA
 	item_attribute $9999, HELD_NONE, 0, NO_LIMITS, ITEM, ITEMMENU_NOUSE, ITEMMENU_NOUSE
 ; $fb
@ -519,3 +523,4 @@ ItemAttributes:
 	item_attribute $9999, HELD_NONE, 0, NO_LIMITS, ITEM, ITEMMENU_NOUSE, ITEMMENU_NOUSE
 ; $00
 	item_attribute $9999, HELD_NONE, 0, NO_LIMITS, ITEM, ITEMMENU_NOUSE, ITEMMENU_NOUSE
+	assert_table_length $100
--- a/data/items/buena_prizes.asm
+++ b/data/items/buena_prizes.asm
@ -1,5 +1,5 @@
 BuenaPrizeItems:
-; there are NUM_BUENA_PRIZES entries
+	table_width 2, BuenaPrizeItems
 	db ULTRA_BALL,   2
 	db FULL_RESTORE, 2
 	db NUGGET,       3
@ -9,3 +9,4 @@ BuenaPrizeItems:
 	db CARBOS,       5
 	db CALCIUM,      5
 	db HP_UP,        5
+	assert_table_length NUM_BUENA_PRIZES
--- a/data/items/descriptions.asm
+++ b/data/items/descriptions.asm
@ -1,5 +1,6 @@
 ItemDescriptions:
-; entries correspond to item ids
+; entries correspond to item ids (see constants/item_constants.asm)
+	table_width 2, ItemDescriptions
 	dw MasterBallDesc
 	dw UltraBallDesc
 	dw BrightpowderDesc
@ -190,6 +191,7 @@ ItemDescriptions:
 	dw MusicMailDesc
 	dw MirageMailDesc
 	dw TeruSama25Desc
+	assert_table_length NUM_ITEMS
 	dw TeruSama26Desc
 	dw TeruSama26Desc
 	dw TeruSama26Desc
@ -255,6 +257,7 @@ ItemDescriptions:
 	dw TeruSama31Desc
 	dw TeruSama32Desc
 	dw TeruSama33Desc
+	assert_table_length $ff

 MasterBallDesc:
 	db   "The best BALL. It"
--- a/data/items/fruit_trees.asm
+++ b/data/items/fruit_trees.asm
@ -1,5 +1,6 @@
 FruitTreeItems:
 ; entries correspond to FRUITTREE_* constants
+	table_width 1, FruitTreeItems
 	db BERRY        ; ROUTE_29
 	db BERRY        ; ROUTE_30_1
 	db BERRY        ; ROUTE_38
@ -30,3 +31,4 @@ FruitTreeItems:
 	db ICE_BERRY    ; PEWTER_CITY_1
 	db MINT_BERRY   ; PEWTER_CITY_2
 	db BURNT_BERRY  ; FUCHSIA_CITY
+	assert_table_length NUM_FRUIT_TREES
--- a/data/items/marts.asm
+++ b/data/items/marts.asm
@ -1,5 +1,6 @@
 Marts:
-; entries correspond to MART_* constants
+; entries correspond to MART_* constants (see constants/mart_constants.asm)
+	table_width 2, Marts
 	dw MartCherrygrove
 	dw MartCherrygroveDex
 	dw MartViolet
@ -34,6 +35,7 @@ Marts:
 	dw MartMtMoon
 	dw MartIndigoPlateau
 	dw MartUnderground
+	assert_table_length NUM_MARTS

 MartCherrygrove:
 	db 4 ; # items
--- a/data/maps/landmarks.asm
+++ b/data/maps/landmarks.asm
@ -6,6 +6,7 @@ ENDM

 Landmarks:
 ; entries correspond to constants/landmark_constants.asm
+	table_width 4, Landmarks
 	dbbw       0,   0, SpecialMapName
 	landmark 140, 100, NewBarkTownName
 	landmark 128, 100, Route29Name
@ -53,6 +54,7 @@ Landmarks:
 	landmark 112,  72, DarkCaveName
 	landmark 124,  88, Route46Name
 	landmark 148,  68, SilverCaveName
+	assert_table_length KANTO_LANDMARK
 	landmark  52, 108, PalletTownName
 	landmark  52,  92, Route1Name
 	landmark  52,  76, ViridianCityName
@ -102,6 +104,7 @@ Landmarks:
 	landmark  12, 100, TohjoFallsName
 	landmark  20,  68, Route28Name
 	landmark 140, 116, FastShipName
+	assert_table_length NUM_LANDMARKS

 NewBarkTownName:     db "NEW BARK¯TOWN@"
 CherrygroveCityName: db "CHERRYGROVE¯CITY@"
--- a/data/maps/maps.asm
+++ b/data/maps/maps.asm
@ -16,6 +16,7 @@ ENDM

 MapGroupPointers::
 ; pointers to the first map of each map group
+	table_width 2, MapGroupPointers
 	dw MapGroup_Olivine     ;  1
 	dw MapGroup_Mahogany    ;  2
 	dw MapGroup_Dungeons    ;  3
@ -42,6 +43,7 @@ MapGroupPointers::
 	dw MapGroup_NewBark     ; 24
 	dw MapGroup_Saffron     ; 25
 	dw MapGroup_Cherrygrove ; 26
+	assert_table_length NUM_MAP_GROUPS

 MapGroup_Olivine:
 	map OlivinePokecenter1F, TILESET_POKECENTER, INDOOR, LANDMARK_OLIVINE_CITY, MUSIC_POKEMON_CENTER, FALSE, PALETTE_DAY, FISHGROUP_SHORE
--- a/data/maps/outdoor_sprites.asm
+++ b/data/maps/outdoor_sprites.asm
@ -3,6 +3,7 @@

 OutdoorSprites:
 ; entries correspond to map groups
+	table_width 2, OutdoorSprites
 	dw OlivineGroupSprites
 	dw MahoganyGroupSprites
 	dw DungeonsGroupSprites
@ -29,6 +30,7 @@ OutdoorSprites:
 	dw NewBarkGroupSprites
 	dw SaffronGroupSprites
 	dw CherrygroveGroupSprites
+	assert_table_length NUM_MAP_GROUPS

 PalletGroupSprites:
 	db SPRITE_SUICUNE
--- a/data/maps/roofs.asm
+++ b/data/maps/roofs.asm
@ -5,10 +5,12 @@
 	const ROOF_AZALEA    ; 2
 	const ROOF_OLIVINE   ; 3
 	const ROOF_GOLDENROD ; 4
+NUM_ROOFS EQU const_value

 MapGroupRoofs:
 ; entries correspond to map groups
 ; values are indexes for Roofs (see below)
+	table_width 1, MapGroupRoofs
 	db -1             ;  0
 	db ROOF_OLIVINE   ;  1 (Olivine)
 	db ROOF_AZALEA    ;  2 (Mahogany)
@ -36,11 +38,14 @@ MapGroupRoofs:
 	db ROOF_NEW_BARK  ; 24 (New Bark)
 	db -1             ; 25
 	db ROOF_NEW_BARK  ; 26 (Cherrygrove)
+	assert_table_length NUM_MAP_GROUPS + 1

 Roofs:
 ; entries correspond to ROOF_* constants
+	table_width ROOF_LENGTH * LEN_2BPP_TILE, Roofs
 INCBIN "gfx/tilesets/roofs/new_bark.2bpp"
 INCBIN "gfx/tilesets/roofs/violet.2bpp"
 INCBIN "gfx/tilesets/roofs/azalea.2bpp"
 INCBIN "gfx/tilesets/roofs/olivine.2bpp"
 INCBIN "gfx/tilesets/roofs/goldenrod.2bpp"
+	assert_table_length NUM_ROOFS
--- a/data/maps/sgb_roof_pal_inds.asm
+++ b/data/maps/sgb_roof_pal_inds.asm
@ -2,6 +2,7 @@

 MapGroupRoofSGBPalInds:
 ; entries correspond to map groups
+	table_width 1, MapGroupRoofSGBPalInds
 	db PREDEFPAL_ROUTES
 	db PREDEFPAL_OLIVINE
 	db PREDEFPAL_MAHOGANY
@ -29,3 +30,4 @@ MapGroupRoofSGBPalInds:
 	db PREDEFPAL_NEW_BARK
 	db PREDEFPAL_SAFFRON
 	db PREDEFPAL_CHERRYGROVE
+	assert_table_length NUM_MAP_GROUPS + 1
--- a/data/maps/spawn_points.asm
+++ b/data/maps/spawn_points.asm
@ -6,6 +6,7 @@ ENDM

 SpawnPoints:
 ; entries correspond to SPAWN_* constants
+	table_width 4, SpawnPoints

 	spawn PLAYERS_HOUSE_2F,            3,  3
 	spawn VIRIDIAN_POKECENTER_1F,      5,  3
@ -39,3 +40,5 @@ SpawnPoints:
 	spawn FAST_SHIP_CABINS_SW_SSW_NW,  6,  2

 	spawn N_A,                        -1, -1
+
+	assert_table_length NUM_SPAWNS + 1
--- a/data/mon_menu.asm
+++ b/data/mon_menu.asm
@ -20,6 +20,7 @@ MonMenuOptionStrings:

 MonMenuOptions:
 ; category, item, value; actions are in PokemonActionSubmenu (see engine/pokemon/mon_menu.asm)
+	table_width 3, MonMenuOptions
 ; moves
 	db MONMENU_FIELD_MOVE, MONMENUITEM_CUT,        CUT
 	db MONMENU_FIELD_MOVE, MONMENUITEM_FLY,        FLY
@ -43,4 +44,5 @@ MonMenuOptions:
 	db MONMENU_MENUOPTION, MONMENUITEM_MOVE,       MONMENUVALUE_MOVE
 	db MONMENU_MENUOPTION, MONMENUITEM_MAIL,       MONMENUVALUE_MAIL
 	db MONMENU_MENUOPTION, MONMENUITEM_ERROR,      MONMENUVALUE_ERROR
-	db -1
+	assert_table_length NUM_MONMENUITEMS
+	db -1 ; end
--- a/data/moves/animations.asm
+++ b/data/moves/animations.asm
@ -1,5 +1,6 @@
 BattleAnimations::
 ; entries correspond to constants/move_constants.asm
+	table_width 2, BattleAnimations
 	dw BattleAnim_0
 	dw BattleAnim_Pound
 	dw BattleAnim_KarateChop
@ -252,10 +253,12 @@ BattleAnimations::
 	dw BattleAnim_RockSmash
 	dw BattleAnim_Whirlpool
 	dw BattleAnim_BeatUp
+	assert_table_length NUM_ATTACKS + 1
 	dw BattleAnim_252
 	dw BattleAnim_253
 	dw BattleAnim_254
 	dw BattleAnim_SweetScent2
+	assert_table_length $100
 ; $100
 	dw BattleAnim_ThrowPokeBall
 	dw BattleAnim_SendOutMon
@ -279,6 +282,7 @@ BattleAnimations::
 	dw BattleAnim_Wobble
 	dw BattleAnim_Shake
 	dw BattleAnim_HitConfusion
+	assert_table_length NUM_BATTLE_ANIMS + 1

 BattleAnim_0:
 BattleAnim_252:
--- a/data/moves/descriptions.asm
+++ b/data/moves/descriptions.asm
@ -1,5 +1,6 @@
 MoveDescriptions::
 ; entries correspond to move ids (see constants/move_constants.asm)
+	table_width 2, MoveDescriptions
 	dw PoundDescription
 	dw KarateChopDescription
 	dw DoubleslapDescription
@ -251,11 +252,13 @@ MoveDescriptions::
 	dw RockSmashDescription
 	dw WhirlpoolDescription
 	dw BeatUpDescription
+	assert_table_length NUM_ATTACKS
 	dw MoveFCDescription
 	dw MoveFDDescription
 	dw MoveFEDescription
 	dw MoveFFDescription
 	dw Move00Description
+	assert_table_length $100

 MoveFCDescription:
 MoveFDDescription:
--- a/data/moves/effects_pointers.asm
+++ b/data/moves/effects_pointers.asm
@ -1,5 +1,6 @@
 MoveEffectsPointers:
 ; entries correspond to EFFECT_* constants
+	table_width 2, MoveEffectsPointers
 	dw NormalHit
 	dw DoSleep
 	dw PoisonHit
@ -157,3 +158,4 @@ MoveEffectsPointers:
 	dw BeatUp
 	dw Fly
 	dw DefenseCurl
+	assert_table_length NUM_MOVE_EFECTS
--- a/data/moves/moves.asm
+++ b/data/moves/moves.asm
@ -11,7 +11,8 @@ move: MACRO
 ENDM

 Moves:
-; entries correspond to constants/move_constants.asm
+; entries correspond to move ids (see constants/move_constants.asm)
+	table_width MOVE_LENGTH, Moves
 	move POUND,        EFFECT_NORMAL_HIT,         40, NORMAL,       100, 35,   0
 	move KARATE_CHOP,  EFFECT_NORMAL_HIT,         50, FIGHTING,     100, 25,   0
 	move DOUBLESLAP,   EFFECT_MULTI_HIT,          15, NORMAL,        85, 10,   0
@ -263,3 +264,4 @@ Moves:
 	move ROCK_SMASH,   EFFECT_DEFENSE_DOWN_HIT,   20, FIGHTING,     100, 15,  50
 	move WHIRLPOOL,    EFFECT_TRAP_TARGET,        15, WATER,         70, 15,   0
 	move BEAT_UP,      EFFECT_BEAT_UP,            10, DARK,         100, 10,   0
+	assert_table_length NUM_ATTACKS
--- a/data/moves/tmhm_moves.asm
+++ b/data/moves/tmhm_moves.asm
@ -3,6 +3,7 @@

 TMHMMoves:
 ; entries correspond to *_TMNUM constants (see constants/item_constants.asm)
+	table_width 1, TMHMMoves

 ; TMs
 n = 1
@ -43,4 +44,6 @@ PURGE MOVE_FOR_MT
 n = n + 1
 endr

+	assert_table_length NUM_TM_HM_TUTOR
+
 	db 0 ; end
--- a/data/party_menu_qualities.asm
+++ b/data/party_menu_qualities.asm
@ -20,6 +20,7 @@ ENDM

 PartyMenuQualityPointers:
 ; entries correspond to PARTYMENUACTION_* constants
+	table_width 2, PartyMenuQualityPointers
 	dw .Default  ; PARTYMENUACTION_CHOOSE_POKEMON
 	dw .Default  ; PARTYMENUACTION_HEALING_ITEM
 	dw .Default  ; PARTYMENUACTION_SWITCH
@ -30,6 +31,7 @@ PartyMenuQualityPointers:
 	dw .Gender   ; PARTYMENUACTION_GIVE_MON_FEMALE
 	dw .Default  ; PARTYMENUACTION_GIVE_ITEM
 	dw .Mobile   ; PARTYMENUACTION_MOBILE
+	assert_table_length NUM_PARTYMENUACTIONS

 .Default:  partymenuqualities NICKNAMES, HP_BAR, HP_DIGITS, LEVEL, STATUS
 .TMHM:     partymenuqualities NICKNAMES, TMHM_COMPAT,       LEVEL, STATUS
--- a/data/phone/non_trainer_names.asm
+++ b/data/phone/non_trainer_names.asm
@ -1,11 +1,13 @@
 NonTrainerCallerNames:
-; entries correspond to PHONECONTACT_* constants
+; entries correspond to PHONECONTACT_* constants (see constants/trainer_constants.asm)
+	table_width 2, NonTrainerCallerNames
 	dw .none
 	dw .mom
 	dw .bikeshop
 	dw .bill
 	dw .elm
 	dw .buena
+	assert_table_length NUM_NONTRAINER_PHONECONTACTS + 1

 .none:     db "----------@"
 .mom:      db "MOM:@"
--- a/data/phone/phone_contacts.asm
+++ b/data/phone/phone_contacts.asm
@ -10,6 +10,7 @@ ENDM

 PhoneContacts:
 ; entries correspond to PHONE_* constants
+	table_width PHONE_CONTACT_SIZE, PhoneContacts
 	phone TRAINER_NONE, PHONE_00,              N_A,                       0,       UnusedPhoneScript,        0,       UnusedPhoneScript
 	phone TRAINER_NONE, PHONECONTACT_MOM,      PLAYERS_HOUSE_1F,          ANYTIME, MomPhoneCalleeScript,     0,       UnusedPhoneScript
 	phone TRAINER_NONE, PHONECONTACT_BIKESHOP, OAKS_LAB,                  0,       UnusedPhoneScript,        0,       UnusedPhoneScript
@ -48,3 +49,4 @@ PhoneContacts:
 	phone HIKER,        PARRY1,                ROUTE_45,                  ANYTIME, ParryPhoneCalleeScript,   ANYTIME, ParryPhoneCallerScript
 	phone PICNICKER,    ERIN1,                 ROUTE_46,                  ANYTIME, ErinPhoneCalleeScript,    ANYTIME, ErinPhoneCallerScript
 	phone TRAINER_NONE, PHONECONTACT_BUENA,    GOLDENROD_DEPT_STORE_ROOF, ANYTIME, BuenaPhoneCalleeScript,   ANYTIME, BuenaPhoneCallerScript
+	assert_table_length NUM_PHONE_CONTACTS + 1
--- a/data/phone/special_calls.asm
+++ b/data/phone/special_calls.asm
@ -7,6 +7,7 @@ ENDM

 SpecialPhoneCallList:
 ; entries correspond to SPECIALCALL_* constants
+	table_width SPECIALCALL_SIZE, SpecialPhoneCallList
 	specialcall SpecialCallOnlyWhenOutside, PHONECONTACT_ELM,      ElmPhoneCallerScript
 	specialcall SpecialCallOnlyWhenOutside, PHONECONTACT_ELM,      ElmPhoneCallerScript
 	specialcall SpecialCallOnlyWhenOutside, PHONECONTACT_ELM,      ElmPhoneCallerScript
@ -15,3 +16,4 @@ SpecialPhoneCallList:
 	specialcall SpecialCallWhereverYouAre,  PHONECONTACT_BIKESHOP, BikeShopPhoneCallerScript
 	specialcall SpecialCallWhereverYouAre,  PHONECONTACT_MOM,      MomPhoneLectureScript
 	specialcall SpecialCallOnlyWhenOutside, PHONECONTACT_ELM,      ElmPhoneCallerScript
+	assert_table_length NUM_SPECIALCALLS
--- a/data/pokemon/base_stats.asm
+++ b/data/pokemon/base_stats.asm
@ -32,6 +32,7 @@ endr
 ENDM

 BaseData::
+	table_width BASE_DATA_SIZE, BaseData
 INCLUDE "data/pokemon/base_stats/bulbasaur.asm"
 INCLUDE "data/pokemon/base_stats/ivysaur.asm"
 INCLUDE "data/pokemon/base_stats/venusaur.asm"
@ -283,5 +284,4 @@ INCLUDE "data/pokemon/base_stats/tyranitar.asm"
 INCLUDE "data/pokemon/base_stats/lugia.asm"
 INCLUDE "data/pokemon/base_stats/ho_oh.asm"
 INCLUDE "data/pokemon/base_stats/celebi.asm"
-.End:
-	assert BaseData.End - BaseData == NUM_POKEMON * BASE_DATA_SIZE
+	assert_table_length NUM_POKEMON
--- a/data/pokemon/cries.asm
+++ b/data/pokemon/cries.asm
@ -5,6 +5,7 @@ ENDM

 PokemonCries::
 ; entries correspond to constants/pokemon_constants.asm
+	table_width MON_CRY_LENGTH, PokemonCries
 	mon_cry CRY_BULBASAUR,   128,  129 ; BULBASAUR
 	mon_cry CRY_BULBASAUR,    32,  256 ; IVYSAUR
 	mon_cry CRY_BULBASAUR,     0,  320 ; VENUSAUR
@ -256,7 +257,9 @@ PokemonCries::
 	mon_cry CRY_TYPHLOSION,    0,  256 ; LUGIA
 	mon_cry CRY_AIPOM,         0,  384 ; HO_OH
 	mon_cry CRY_ENTEI,       330,  273 ; CELEBI
+	assert_table_length NUM_POKEMON
 	mon_cry CRY_NIDORAN_M,     0,    0 ; 252
 	mon_cry CRY_NIDORAN_M,     0,    0 ; 253
 	mon_cry CRY_NIDORAN_M,     0,    0 ; 254
 	mon_cry CRY_NIDORAN_M,     0,    0 ; 255
+	assert_table_length $ff
--- a/data/pokemon/dex_entry_pointers.asm
+++ b/data/pokemon/dex_entry_pointers.asm
@ -1,5 +1,6 @@
 PokedexDataPointerTable:
 ; entries correspond to constants/pokemon_constants.asm
+	table_width 2, PokedexDataPointerTable
 	dw BulbasaurPokedexEntry
 	dw IvysaurPokedexEntry
 	dw VenusaurPokedexEntry
@ -251,3 +252,4 @@ PokedexDataPointerTable:
 	dw LugiaPokedexEntry
 	dw HoOhPokedexEntry
 	dw CelebiPokedexEntry
+	assert_table_length NUM_POKEMON
--- a/data/pokemon/dex_order_alpha.asm
+++ b/data/pokemon/dex_order_alpha.asm
@ -1,6 +1,7 @@
 ; Every Pokémon sorted alphabetically by name.

 AlphabeticalPokedexOrder:
+	table_width 1, AlphabeticalPokedexOrder
 	db ABRA
 	db AERODACTYL
 	db AIPOM
@ -252,3 +253,4 @@ AlphabeticalPokedexOrder:
 	db YANMA
 	db ZAPDOS
 	db ZUBAT
+	assert_table_length NUM_POKEMON
--- a/data/pokemon/dex_order_new.asm
+++ b/data/pokemon/dex_order_new.asm
@ -1,6 +1,7 @@
 ; Every Pokémon sorted in New Pokédex Order.

 NewPokedexOrder:
+	table_width 1, NewPokedexOrder
 	db CHIKORITA
 	db BAYLEEF
 	db MEGANIUM
@ -252,3 +253,4 @@ NewPokedexOrder:
 	db MEWTWO
 	db MEW
 	db CELEBI
+	assert_table_length NUM_POKEMON
--- a/data/pokemon/egg_move_pointers.asm
+++ b/data/pokemon/egg_move_pointers.asm
@ -1,4 +1,5 @@
 EggMovePointers::
+	table_width 2, EggMovePointers
 	dw BulbasaurEggMoves
 	dw NoEggMoves
 	dw NoEggMoves
@ -250,3 +251,4 @@ EggMovePointers::
 	dw NoEggMoves
 	dw NoEggMoves
 	dw NoEggMoves
+	assert_table_length NUM_POKEMON
--- a/data/pokemon/evos_attacks_pointers.asm
+++ b/data/pokemon/evos_attacks_pointers.asm
@ -1,6 +1,7 @@
 ; Evolutions and attacks are grouped together since they're both checked at level-up.

 EvosAttacksPointers::
+	table_width 2, EvosAttacksPointers
 	dw BulbasaurEvosAttacks
 	dw IvysaurEvosAttacks
 	dw VenusaurEvosAttacks
@ -252,3 +253,4 @@ EvosAttacksPointers::
 	dw LugiaEvosAttacks
 	dw HoOhEvosAttacks
 	dw CelebiEvosAttacks
+	assert_table_length NUM_POKEMON
--- a/data/pokemon/gen1_base_special.asm
+++ b/data/pokemon/gen1_base_special.asm
@ -1,6 +1,7 @@
 ; The original base Special stat for each Pokémon from Red/Blue

 KantoMonSpecials:
+	table_width 1, KantoMonSpecials
 	db  65 ; BULBASAUR
 	db  80 ; IVYSAUR
 	db 100 ; VENUSAUR
@ -152,3 +153,4 @@ KantoMonSpecials:
 	db 100 ; DRAGONITE
 	db 154 ; MEWTWO
 	db 100 ; MEW
+	assert_table_length JOHTO_POKEMON - 1
--- a/data/pokemon/gen1_order.asm
+++ b/data/pokemon/gen1_order.asm
@ -1,4 +1,5 @@
 Pokered_MonIndices:
+	table_width 1, Pokered_MonIndices
 	db RHYDON
 	db KANGASKHAN
 	db NIDORAN_M
@ -189,7 +190,7 @@ Pokered_MonIndices:
 	db BELLSPROUT
 	db WEEPINBELL
 	db VICTREEBEL
-
+	assert_table_length 190 ; gen 1 mon indexes
 	db CHIKORITA
 	db BAYLEEF
 	db MEGANIUM
@ -252,3 +253,4 @@ Pokered_MonIndices:
 	db QWILFISH
 	db WOBBUFFET
 	db WOBBUFFET
+	assert_table_length NUM_POKEMON + 1
--- a/data/pokemon/menu_icons.asm
+++ b/data/pokemon/menu_icons.asm
@ -1,6 +1,7 @@
 ; party menu icons

 MonMenuIcons:
+	table_width 1, MonMenuIcons
 	db ICON_BULBASAUR   ; BULBASAUR
 	db ICON_BULBASAUR   ; IVYSAUR
 	db ICON_BULBASAUR   ; VENUSAUR
@ -252,3 +253,4 @@ MonMenuIcons:
 	db ICON_LUGIA       ; LUGIA
 	db ICON_HO_OH       ; HO_OH
 	db ICON_HUMANSHAPE  ; CELEBI
+	assert_table_length NUM_POKEMON
--- a/data/pokemon/names.asm
+++ b/data/pokemon/names.asm
@ -1,4 +1,5 @@
 PokemonNames::
+	table_width NAME_LENGTH - 1, PokemonNames
 	db "BULBASAUR@"
 	db "IVYSAUR@@@"
 	db "VENUSAUR@@"
@ -250,8 +251,11 @@ PokemonNames::
 	db "LUGIA@@@@@"
 	db "HO-OH@@@@@"
 	db "CELEBI@@@@"
+	assert_table_length NUM_POKEMON
 	db "?????@@@@@"
 	db "EGG@@@@@@@"
+	assert_table_length EGG
 	db "?????@@@@@"
 	db "?????@@@@@"
 	db "?????@@@@@"
+	assert_table_length $100
--- a/data/pokemon/palettes.asm
+++ b/data/pokemon/palettes.asm
@ -5,6 +5,9 @@ PokemonPalettes:
 ; only the middle two colors are included, not black or white.
 ; Shiny palettes are defined directly, not generated.

+	; 2 middle palettes, front and shiny, with 2 colors each
+	table_width PAL_COLOR_SIZE * 2 * 2, PokemonPalettes
+
 ; 000
 	RGB 30, 22, 17
 	RGB 16, 14, 19
@ -515,6 +518,8 @@ INCLUDE "gfx/pokemon/ho_oh/shiny.pal"
 INCBIN "gfx/pokemon/celebi/front.gbcpal", middle_colors
 INCLUDE "gfx/pokemon/celebi/shiny.pal"

+	assert_table_length NUM_POKEMON + 1
+
 ; 252
 	RGB 30, 26, 11
 	RGB 23, 16, 00
@ -525,6 +530,8 @@ INCLUDE "gfx/pokemon/celebi/shiny.pal"
 INCBIN "gfx/pokemon/egg/front.gbcpal", middle_colors
 INCLUDE "gfx/pokemon/egg/shiny.pal"

+	assert_table_length EGG + 1
+
 ; 254
 	RGB 30, 26, 11
 	RGB 23, 16, 00
@ -538,3 +545,5 @@ INCLUDE "gfx/pokemon/egg/shiny.pal"
 ; 255 shiny
 	RGB 23, 23, 23
 	RGB 17, 17, 17
+
+	assert_table_length $100
--- a/data/pokemon/pic_pointers.asm
+++ b/data/pokemon/pic_pointers.asm
@ -2,6 +2,7 @@

 PokemonPicPointers::
 ; entries correspond to Pokémon species, two apiece
+	table_width 3 * 2, PokemonPicPointers
 	dba_pic BulbasaurFrontpic
 	dba_pic BulbasaurBackpic
 	dba_pic IvysaurFrontpic
@ -507,7 +508,9 @@ PokemonPicPointers::
 	dba_pic HoOhBackpic
 	dba_pic CelebiFrontpic
 	dba_pic CelebiBackpic
+	assert_table_length NUM_POKEMON
 	dbw -1, -1 ; unused
 	dbw -1, -1 ; unused
 	dba_pic EggPic
 	dbw -1, -1 ; unused
+	assert_table_length EGG
--- a/data/pokemon/unown_pic_pointers.asm
+++ b/data/pokemon/unown_pic_pointers.asm
@ -1,5 +1,6 @@
 UnownPicPointers::
 ; entries correspond to Unown letters, two apiece
+	table_width 3 * 2, UnownPicPointers
 	dba_pic UnownAFrontpic
 	dba_pic UnownABackpic
 	dba_pic UnownBFrontpic
@ -52,3 +53,4 @@ UnownPicPointers::
 	dba_pic UnownYBackpic
 	dba_pic UnownZFrontpic
 	dba_pic UnownZBackpic
+	assert_table_length NUM_UNOWN
--- a/data/pokemon/unown_words.asm
+++ b/data/pokemon/unown_words.asm
@ -9,7 +9,8 @@ ENDM

 UnownWords:
 ; entries correspond to UNOWN_* form constants
-	dw UnownWordA
+	table_width 2, UnownWords
+	dw UnownWordA ; unused
 	dw UnownWordA
 	dw UnownWordB
 	dw UnownWordC
@ -36,6 +37,7 @@ UnownWords:
 	dw UnownWordX
 	dw UnownWordY
 	dw UnownWordZ
+	assert_table_length NUM_UNOWN + 1

 UnownWordA: unownword "ANGRY"
 UnownWordB: unownword "BEAR"
--- a/data/radio/buenas_passwords.asm
+++ b/data/radio/buenas_passwords.asm
@ -1,5 +1,5 @@
 BuenasPasswordTable:
-; there are NUM_PASSWORD_CATEGORIES entries
+	table_width 2, BuenasPasswordTable
 	dw .JohtoStarters
 	dw .Beverages
 	dw .HealingItems
@ -11,6 +11,7 @@ BuenasPasswordTable:
 	dw .Moves
 	dw .XItems
 	dw .RadioStations
+	assert_table_length NUM_PASSWORD_CATEGORIES

               ; string type, points, option 1, option 2, option 3
 .JohtoStarters: db BUENA_MON,    10, CYNDAQUIL, TOTODILE, CHIKORITA
--- a/data/radio/channel_music.asm
+++ b/data/radio/channel_music.asm
@ -1,5 +1,6 @@
 RadioChannelSongs:
-; entries correspond to radio channel ids
+; entries correspond to radio channel ids (see constants/radio_constants.asm)
+	table_width 2, RadioChannelSongs
 	dw MUSIC_POKEMON_TALK
 	dw MUSIC_POKEMON_CENTER
 	dw MUSIC_TITLE
@ -11,3 +12,4 @@ RadioChannelSongs:
 	dw MUSIC_POKE_FLUTE_CHANNEL
 	dw MUSIC_RUINS_OF_ALPH_RADIO
 	dw MUSIC_LAKE_OF_RAGE_ROCKET_RADIO
+	assert_table_length NUM_RADIO_CHANNELS
--- a/data/radio/oaks_pkmn_talk_routes.asm
+++ b/data/radio/oaks_pkmn_talk_routes.asm
@ -1,7 +1,6 @@
 ; Oak's Pokémon Talk will list wild Pokémon on these maps.

 OaksPKMNTalkRoutes:
-; there are NUM_OAKS_POKEMON_TALK_ROUTES entries
 	map_id ROUTE_29
 	map_id ROUTE_46
 	map_id ROUTE_30
@ -17,3 +16,4 @@ OaksPKMNTalkRoutes:
 	map_id ROUTE_45
 	map_id ROUTE_36
 	map_id ROUTE_31
+.End
--- a/data/sprite_anims/framesets.asm
+++ b/data/sprite_anims/framesets.asm
@ -1,5 +1,6 @@
 SpriteAnimFrameData:
-; entries correspond to SPRITE_ANIM_FRAMESET_* constants
+; entries correspond to SPRITE_ANIM_FRAMESET_* constants (see constants/sprite_anim_constants.asm)
+	table_width 2, SpriteAnimFrameData
 	dw .Frameset_00
 	dw .Frameset_PartyMon
 	dw .Frameset_PartyMonWithMail
@ -66,6 +67,7 @@ SpriteAnimFrameData:
 	dw .Frameset_IntroUnownF
 	dw .Frameset_CelebiLeft
 	dw .Frameset_CelebiRight
+	assert_table_length NUM_SPRITE_ANIM_FRAMESETS

 .Frameset_00:
 	frame SPRITE_ANIM_OAMSET_RED_WALK_1, 32
--- a/data/sprite_anims/oam.asm
+++ b/data/sprite_anims/oam.asm
@ -1,5 +1,6 @@
 SpriteAnimOAMData:
-; entries correspond to SPRITE_ANIM_OAMSET_* constants
+; entries correspond to SPRITE_ANIM_OAMSET_* constants (see constants/sprite_anim_constants.asm)
+	table_width 3, SpriteAnimOAMData
 	; vtile offset, data pointer
 	dbw $00, .OAMData_RedWalk                  ; SPRITE_ANIM_OAMSET_RED_WALK_1
 	dbw $04, .OAMData_RedWalk                  ; SPRITE_ANIM_OAMSET_RED_WALK_2
@ -141,6 +142,7 @@ SpriteAnimOAMData:
 	dbw $08, .OAMData_GameFreakLogo4_11        ; SPRITE_ANIM_OAMSET_GAMEFREAK_LOGO_9
 	dbw $04, .OAMData_GameFreakLogo4_11        ; SPRITE_ANIM_OAMSET_GAMEFREAK_LOGO_10
 	dbw $00, .OAMData_GameFreakLogo4_11        ; SPRITE_ANIM_OAMSET_GAMEFREAK_LOGO_11
+	assert_table_length NUM_SPRITE_ANIM_OAMSETS

 .OAMData_1x1_Palette0:
 	db 1
--- a/data/sprite_anims/sequences.asm
+++ b/data/sprite_anims/sequences.asm
@ -1,5 +1,6 @@
 SpriteAnimSeqData:
-; entries correspond to SPRITE_ANIM_INDEX_* constants
+; entries correspond to SPRITE_ANIM_INDEX_* constants (see constants/sprite_anim_constants.asm)
+	table_width 3, SpriteAnimSeqData
 	; frameset, sequence, tile
 ; SPRITE_ANIM_INDEX_PARTY_MON
 	db SPRITE_ANIM_FRAMESET_PARTY_MON,                 SPRITE_ANIM_SEQ_PARTY_MON,                 SPRITE_ANIM_DICT_DEFAULT
@ -91,3 +92,4 @@ SpriteAnimSeqData:
 	db SPRITE_ANIM_FRAMESET_INTRO_SUICUNE_AWAY,        SPRITE_ANIM_SEQ_INTRO_SUICUNE_AWAY,        SPRITE_ANIM_DICT_DEFAULT
 ; SPRITE_ANIM_INDEX_CELEBI
 	db SPRITE_ANIM_FRAMESET_CELEBI_LEFT,               SPRITE_ANIM_SEQ_NULL,                      SPRITE_ANIM_DICT_DEFAULT
+	assert_table_length NUM_SPRITE_ANIM_INDEXES
--- a/data/sprites/emotes.asm
+++ b/data/sprites/emotes.asm
@ -7,6 +7,7 @@ ENDM

 Emotes:
 ; entries correspond to EMOTE_* constants
+	table_width EMOTE_LENGTH, Emotes
 	emote ShockEmote,     4, $f8
 	emote QuestionEmote,  4, $f8
 	emote HappyEmote,     4, $f8
@ -19,3 +20,4 @@ Emotes:
 	emote FishingRodGFX,  2, $fc
 	emote BoulderDustGFX, 2, $fe
 	emote GrassRustleGFX, 1, $fe
+	assert_table_length NUM_EMOTES
--- a/data/sprites/facings.asm
+++ b/data/sprites/facings.asm
@ -1,5 +1,6 @@
 Facings:
-; entries correspond to FACING_* constants
+; entries correspond to FACING_* constants (see constants/map_object_constants.asm)
+	table_width 2, Facings
 	dw FacingStepDown0
 	dw FacingStepDown1
 	dw FacingStepDown2
@ -32,10 +33,8 @@ Facings:
 	dw FacingBoulderDust2
 	dw FacingGrass1
 	dw FacingGrass2
-.End
-	dw 0
-
-NUM_FACINGS EQU (Facings.End - Facings) / 2
+	assert_table_length NUM_FACINGS
+	dw 0 ; end

 ; Tables used as a reference to transform OAM data.

--- a/data/sprites/map_objects.asm
+++ b/data/sprites/map_objects.asm
@ -1,5 +1,6 @@
 SpriteMovementData::
 ; entries correspond to SPRITEMOVEDATA_* constants
+	table_width NUM_SPRITEMOVEDATA_FIELDS, SpriteMovementData

 ; SPRITEMOVEDATA_00
 	db SPRITEMOVEFN_00 ; movement function
@ -304,3 +305,5 @@ SpriteMovementData::
 	db 0 ; flags1
 	db 0 ; flags2
 	db 0 ; palette flags
+
+	assert_table_length NUM_SPRITEMOVEDATA + 1
--- a/data/sprites/sprite_mons.asm
+++ b/data/sprites/sprite_mons.asm
@ -1,5 +1,6 @@
 SpriteMons:
 ; entries correspond to SPRITE_* constants past SPRITE_POKEMON
+	table_width 1, SpriteMons
 	db UNOWN
 	db GEODUDE
 	db GROWLITHE
@ -35,3 +36,4 @@ SpriteMons:
 	db GYARADOS
 	db LUGIA
 	db HO_OH
+	assert_table_length NUM_POKEMON_SPRITES
--- a/data/sprites/sprites.asm
+++ b/data/sprites/sprites.asm
@ -6,6 +6,7 @@ ENDM

 OverworldSprites:
 ; entries correspond to SPRITE_* constants
+	table_width NUM_SPRITEDATA_FIELDS, OverworldSprites
 	overworld_sprite ChrisSpriteGFX, 12, WALKING_SPRITE, PAL_OW_RED
 	overworld_sprite ChrisBikeSpriteGFX, 12, WALKING_SPRITE, PAL_OW_RED
 	overworld_sprite GameboyKidSpriteGFX, 12, STANDING_SPRITE, PAL_OW_GREEN
@ -108,3 +109,4 @@ OverworldSprites:
 	overworld_sprite EnteiSpriteGFX, 4, STILL_SPRITE, PAL_OW_RED
 	overworld_sprite RaikouSpriteGFX, 4, STILL_SPRITE, PAL_OW_RED
 	overworld_sprite StandingYoungsterSpriteGFX, 12, STANDING_SPRITE, PAL_OW_BLUE
+	assert_table_length NUM_OVERWORLD_SPRITES
--- a/Show More
+++ b/Show More