[mateuszklysz]

SN cc1 from source

The level units in OVERLAY_SN_UNITS no longer use SN's cc1.exe. They use the same compiler built from source:

• scripts/build-sn-compiler.py builds gcc-2.95.2 with the R5900 back end of the EE archive, four patches from patches/sce-991111b/ and the seven in patches/sn-2.95.2/. setup.sh runs it (about 30 s).
• overlay-sn runs SN's preprocessor, then this cc1. SN's driver and Ps2EeAs stay.
• Without 0062 (the gcc-2.95.3 reload fix), the output equals cc1.exe on all 180 units. Each SN patch is needed: leaving one out changes 3 to 49 units. patches/sn-2.95.2/README.md has the details.
• The retail level code has 0062 too. With it, FUN_L05_0030de90 (electric_gate) and FUN_L10_002dcc58 (platform) match and move to C.

Level code in C

• walloper: build_beam_and_arc_points and draw_scrolling_ribbon_colored.
• pyrocitor_update, the hero item slot pose update FUN_L00_0020f580, reveal_map_around_position and the nanotech ball suction tube update.
• link_and_update_all_mobys and update_visible_resident_objects.

Near-miss drafts

• FUN_L00_002648e0 stays in asm. Retail leaves both delay slots around the update call empty; C here always fills one.
• FUN_L08_002f5e58 (draw_flickering_mesh_effect, commando grid), the suction tube ring loop, render_vendor_buy_label_pass, update_mpeg_frame_size, sceCdInit and _getRef0 drafts are closer to retail.

Names

• Hero and pad fields: 333 unkXXX fields in Hero, HeroMotion, HeroItemSlot, HeroEase, HeroManipulator, HeroHealth and PadState, named from their uses.
• 97 level functions and 23 boot functions, named from what they do. Names with level tags, hex runs or invented enemy names are left out.
• padless-asm.py now also finds a function defined under its C name with __asm__("FUN_..."). Before, renaming such a function moved a late .extern and changed the unit's size.

make elf, make overlays, make check and check-cleanup.py pass.

[github-actions]

Decompilation progress

	C_EXACT	Change	Matched bytes	Functions	C_FUZZY
All code	99.47 %	+0.54 pp	3,529,076 / 3,547,932 B (+19,072 B)	4,229 / 4,244 (+8)	99.53 %
Boot executable	99.03 %	—	351,068 / 354,504 B (—)	1,224 / 1,230 (—)	99.65 %
Game	99.65 %	—	272,508 / 273,476 B (—)	906 / 909 (—)	99.97 %
SDK	96.95 %	—	78,560 / 81,028 B (—)	318 / 321 (—)	98.55 %
Level overlays	99.52 %	+0.60 pp	3,178,008 / 3,193,428 B (+19,072 B)	3,005 / 3,014 (+8)	99.52 %
Shared level code	99.22 %	+1.53 pp	1,121,708 / 1,130,492 B (+17,256 B)	1,576 / 1,583 (+6)	99.22 %
Per-level code	99.68 %	+0.09 pp	2,056,300 / 2,062,936 B (+1,816 B)	1,429 / 1,431 (+2)	99.68 %

	Data in C	Change	Matched bytes
All data	43.58 %	—	5,418,333 / 12,433,372 B (—)
Boot executable	2.32 %	—	16,238 / 699,136 B (—)
Level overlays	46.04 %	—	5,402,095 / 11,734,236 B (—)

8 newly matched functions (19,072 B)

Function	Address	Size	Unit
FUN_L00_002b94d0	0x002b94d0	5,280 B	shared/gameplay/entities/walloper
FUN_L00_002ddf60	0x002ddf60	4,220 B	shared/gameplay/entities/nanotech_ball
FUN_L00_002b77f0	0x002b77f0	2,624 B	shared/gameplay/entities/devastator
FUN_L00_0020f580	0x0020f580	1,828 B	shared/gameplay/hero/hero_check_damage
FUN_L00_002484e0	0x002484e0	1,808 B	shared/ui/map/002484e0
FUN_L00_002be078	0x002be078	1,496 B	shared/gameplay/entities/walloper
FUN_L10_002dcc58	0x002dcc58	948 B	level_10/gameplay/entities/platform
FUN_L05_0030de90	0x0030de90	868 B	level_05/gameplay/entities/electric_gate

_{Compared with main (2d6fb52). C_FUZZY uses main's last measurement.}