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https://github.com/Druthulu/BFM-decomp
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Drew T
44 lines
2.9 KiB
Python
44 lines
2.9 KiB
Python
#!/usr/bin/env python3
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"""oracle_reorder.py — decide whether a NEAR residual is a C defect or an ASSEMBLER artifact.
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WHY (P31 S53, cookbook §188). The `jr $ra` + `addiu $sp` epilogue tail — and unfilled branch delay
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slots generally — are produced by GNU `as` at `-O2`, NOT by cc1. The project pins `ASFLAGS -O1`
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(Makefile:563) and maspsx force-emits `.set noreorder` after every `.ent`
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(tools/maspsx/maspsx/__init__.py:856-859), so under the pinned triple that shape is UNREACHABLE from
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any C source. A draft can therefore be perfectly correct and still sit at a stubborn residual.
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THE DIAGNOSTIC: re-assemble the SAME draft two ways and compare.
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maspsx + as -O1 (the pinned path) -> the residual you already see
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bypass + as -O2 (maspsx skipped) -> if this is 0 diffs, THE C IS ALREADY RIGHT
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A 0 in the second cell means: file IMMOVABLE, stop grinding, no C-level work can ever close it.
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Measured on func_80061FA8 (target 103 ins): pinned 57 diffs/106 ins; bypass+-O2 0 diffs/103 ins.
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Promoted verbatim from .run/wave_p31r/oracle61.py because a cookbook section may not cite evidence
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that lives under a gitignored path (the verifier that found this flagged exactly that).
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"""
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"""Byte-exact oracle for the 0x8005D000-0x80062600 PsyQ island: cpp -> cc1 -> (move->addu) -> as -O2.
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Reproduces the ORIGINAL assembler's reorder-mode delay-slot swapping, which maspsx (forced
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`.set noreorder`) + the pinned `as -O1` cannot emit. Diagnostic only -- NOT the project gate."""
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import subprocess,sys,re,os
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sys.path.insert(0,'tools'); import masked_diff
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CPP='mipsel-linux-gnu-cpp'; CC1='tools/bin/gcc-2.7.2-psx/cc1'; AS='mipsel-linux-gnu-as'
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CPPFLAGS='-lang-c -Iinclude -undef -Wall -fno-builtin -Dmips -D__GNUC__=2 -D__OPTIMIZE__ -Dpsx -D_PSYQ -D_MIPSEL -D_LANGUAGE_C'.split()
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CC1FLAGS='-quiet -O2 -G0 -mips1 -mcpu=3000 -mgas -msoft-float -fgnu-linker'.split()
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ASFLAGS='-Iinclude -march=r3000 -mtune=r3000 -no-pad-sections -O2 -G0'.split()
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cfile,fn,sub=sys.argv[1],sys.argv[2],sys.argv[3]
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wd='.run/match/oracle61'; os.makedirs(wd,exist_ok=True)
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s=masked_diff.strip_scalar_typedefs(open(cfile).read())
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if '#include "common.h"' not in s: s='#include "common.h"\n'+s
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open(wd+'/t.c','w').write(s)
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p=subprocess.run([CPP]+CPPFLAGS+[wd+'/t.c'],capture_output=True)
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assert not p.returncode,p.stderr.decode()[-1500:]
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q=subprocess.run([CC1]+CC1FLAGS,input=p.stdout,capture_output=True)
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assert not q.returncode,q.stderr.decode()[-2500:]
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asm=re.sub(r'\tmove\t(\$\w+),(\$\w+)', lambda m:'\taddu\t%s,%s,$0'%(m.group(1),m.group(2)), q.stdout.decode())
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r=subprocess.run([AS]+ASFLAGS+['-o',wd+'/t.o'],input=asm.encode(),capture_output=True)
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assert not r.returncode,r.stderr.decode()[-1500:]
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mine=masked_diff.insns_from_object(wd+'/t.o',fn); tgt=masked_diff.insns_from_s('%s/%s.s'%(sub,fn))
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d=masked_diff.structured_diff(mine,tgt)
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print('ORACLE %s mine=%d tgt=%d diffs=%d'%(fn,len(mine),len(tgt),len(d)))
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for i,m,t in d[:15]: print(' ',i,m,'|',t)
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