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Delete CCompilerPatcher.py
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Elliot Nunn
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#!/usr/bin/env python3
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# Patch the Apple C Compiler to output symbol-laden files unconditionally... without messing up the codegen!
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from collections import Counter
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def do_everything():
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# Essential Patches
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# Sets the "version" of the output file (to 3)
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force_value(2, 0x5048, 'OPENOBJECTFILE', 'move.b #gSymOn,d0')
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# Places Filename records
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force_value(1, 0x842, 'OPENNEWFILE', 'move.b #gSymOn,d0')
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# Apparently we crash without this
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force_value(26, 0x118, 'INITIALIZE', 'move.b #gSymOn,d0')
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# Inits something called the "file pos array"
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force_value(25, 0x63e6, 'INITPROC', 'move.b #gSymOn,d0')
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# Ooooh boy...
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# force_value(10, 0x4576, 'FUNCTIONDECL', 'move.b #gSymOn,d0')
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force_value(10, 0x47e6, 'FUNCTIONDECL', 'move.b #gSymOn,d0')
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# force_value(10, 0x4afe, 'FUNCTIONDECL', 'move.b #gSymOn,d0')
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# force_value(10, 0x4c62, 'FUNCTIONDECL', 'move.b #gSymOn,d0')
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# force_value(10, 0x4d8e, 'FUNCTIONDECL', 'move.b #gSymOn,d0')
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# force_value(10, 0x5116, 'FUNCTIONDECL', 'move.b #gSymOn,d0')
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# force_value(10, 0x51b8, 'FUNCTIONDECL', 'move.b #gSymOn,d0')
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# force_value(10, 0x52e6, 'FUNCTIONDECL', 'move.b #gSymOn,d0')
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# force_value(10, 0x5544, 'FUNCTIONDECL', 'move.b #gSymOn,d0')
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# force_value(10, 0x4e3c, 'FUNCTIONDECL', 'move.b #gSymVars,d0')
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# force_value(10, 0x4f56, 'FUNCTIONDECL', 'move.b #gSymVars,d0')
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# force_value(10, 0x5142, 'FUNCTIONDECL', 'move.b #gSymVars,d0')
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# force_value(10, 0x521a, 'FUNCTIONDECL', 'move.b #gSymVars,d0')
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# force_value(10, 0x538a, 'FUNCTIONDECL', 'move.b #gSymVars,d0')
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# One of these seems to annotate which files have been opened...
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# force_value(1, 0x48, 'SETSCANFILE', 'move.b #gSymOn,d0')
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# One of these is required for the first "ModuleBegin"... can safely skip, apparently!
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# force_value(1, 0x3fa2, 'PROG', 'move.b #gSymOn,d0')
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# force_value(1, 0x40fe, 'PROG', 'move.b #gSymOn,d0')
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# force_value(1, 0x4170, 'PROG', 'move.b #gSymVars,d0')
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# force_value(1, 0x4250, 'PROG', 'move.b #gSymVars,d0')
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# force_value(1, 0x486e, 'PROG', 'move.b #gSymOn,d0')
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# force_value(6, 0x258a, 'EXPANDMACRO', 'and.b #gSymOn,d0')
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# force_value(6, 0x441a, 'MACROLINE', 'move.b #gSymOn,d0')
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# force_value(6, 0x508a, 'LOADFILE', 'cmp.b #gSymOn,d0')
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# force_value(6, 0x5174, 'LOADFILE', 'move.b #gSymOn,d0')
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# force_value(6, 0x6416, 'DUMPFILE', 'move.b #gSymOn,-$2190(a6)')
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# force_value(6, 0x6720, 'DUMPFILE', 'move.b #gSymOn,d0')
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# force_value(7, 0x7d4, 'PROTOPARMLIST', 'move.b #gSymVars,d0')
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# force_value(7, 0x89a, 'PROTOPARMLIST', 'move.b #gSymOn,d0')
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# force_value(7, 0xa80, 'PROTOPARMLIST', 'move.b #gSymVars,d0')
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# force_value(7, 0xb16, 'PROTOPARMLIST', 'move.b #gSymOn,d0')
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# Not required...
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# force_value(7, 0x19f6, 'DECLARATION', 'move.b #gSymOn,d0')
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# force_value(7, 0x1d6e, 'DECLARATION', 'move.b #gSymOn,d0')
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# force_value(7, 0x1dec, 'DECLARATION', 'move.b #gSymOn,d0')
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# force_value(7, 0x2180, 'DECLARATION', 'move.b #gSymOn,d0')
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# force_value(7, 0x2296, 'DECLARATION', 'move.b #gSymOn,d0')
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# force_value(7, 0x2314, 'DECLARATION', 'move.b #gSymOn,d0')
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# force_value(7, 0x267a, 'DECLARATION', 'move.b #gSymOn,d0')
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# force_value(7, 0x27c8, 'DECLARATION', 'move.b #gSymOn,d0')
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#... skipped some because bored!
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# skipped some tedious "dumpfunction" symbols here!
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# force_value(25, 0x53d0, 'FORMATCODE', 'move.b #gSymOn,d0')
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# force_value(25, 0x53d8, 'FORMATCODE', 'move.b #gSymLines,d0')
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def gappy_compare(actual_str, search_str):
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if len(actual_str) != len(search_str): return False
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for actual_el, search_el in zip(actual_str, search_str):
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if actual_el != search_el and search_el != 0x99: return False
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return True
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def scan_back(cursor, binary, *search_strs):
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if cursor is None: cursor = len(binary)
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while cursor > 0:
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cursor -= 1
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for which, ss in enumerate(search_strs):
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if gappy_compare(binary[cursor:cursor+len(ss)], ss):
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return cursor, which
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return cursor, None
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def bool_global_a5_offset_from_SETSYMDEBUGOPTION(code):
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# Count all the below opcodes, and the most common is accessing our desired global
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most_common = Counter()
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i = None
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while True:
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i, which = scan_back(i, code, b'\x1B\x7C\x00\x01\x99\x99') # MOVE.B #1,????(A5)
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if which != 0: break
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a5 = bytes(code[i+4:i+6])
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most_common[a5] += 1
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if most_common:
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most_common, freq = most_common.most_common(1)[0]
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return most_common
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def patch_global_access_by_function(code, my_global):
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global_access = b'\x10\x2d' + my_global # MOVE.B my_global(A5),D0
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num_patches = 0
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i = None
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while True:
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if b'FUNCTIONDECL\0' in code:
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i, which = scan_back(i, code, b'\x3f\x3c\x00\x04\x2f\x2d\x99\x99\x4e\x99\x99\x99') # MOVE.W #4,-(SP); MOVE.L ????(A5),-(SP); JSR ??????)
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if which != 0: break
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i, which = scan_back(i, code, global_access)
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if which != 0: break
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code[i:i+4] = b'\x10\x3c\x00\x01' # MOVE.B #1,D0
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num_patches += 1
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return num_patches
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def find_functions(segment):
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offset = 0
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biglist = []
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while offset < len(segment):
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next_offset = segment.find(b'NV', offset + 1)
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if next_offset == -1: next_offset = len(segment)
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biglist.append((offset, segment[offset:next_offset]))
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offset = next_offset
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return biglist
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def do_better(all_resources):
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segments = [r for r in all_resources if r.type == b'CODE' and r.id > 0]
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print('Patching C compiler to force some SADE symbols (selectively, without changing codegen)')
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a5glob = None
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for segment in segments:
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for offset, function in find_functions(segment):
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if b'SETSYMDEBUGOPTION\0' in function:
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a5glob = bool_global_a5_offset_from_SETSYMDEBUGOPTION(function)
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if a5glob is None:
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print(' Could not find the -sym global. Stopping.')
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return
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print(f' Found the -sym global: {hex(struct.unpack(">h", a5glob)[0])}(A5)')
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for segment in segments:
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for offset, function in find_functions(segment):
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for fname in ['OPENOBJECTFILE', 'OPENNEWFILE', 'INITIALIZE', 'INITPROC', 'FUNCTIONDECL']:
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if fname.encode('ascii') + b'\0' in function:
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num_patches = patch_global_access_by_function(function, a5glob)
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if num_patches:
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print(f' Hardcoded to true: {fname} (seg {segment.id} {repr(segment.name)} + {hex(offset)}) x{num_patches}')
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segment[offset:offset+len(function)] = function
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import macresources
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import re
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import struct
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target = '/Users/elliotnunn/Documents/mac/supermario/worktree/cube-e/Tools/C.rdump'
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resources = list(macresources.parse_rez_code(open(target, 'rb').read()))
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def force_value(in_segment, at_offset, in_func_name, code):
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known_globals = {'gSymLines': -0x1082, 'gSymTypes': -0x1081, 'gSymVars': -0x1080, 'gSymOn': -0x107f}
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for r in resources:
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if r.id == in_segment and r.type == b'CODE': break
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else:
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raise ValueError('bad segment %r' % in_segment)
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m = re.match(r'move.b #(\w+),d0', code)
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if not m:
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print('Could not match %r' % code)
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return
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if struct.unpack_from('>h', r, at_offset + 2)[0] != known_globals[m.group(1)]:
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print('Bad code %r %r %r %r' % (in_segment, at_offset, in_func_name, code))
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return
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struct.pack_into('>HH', r, at_offset, 0x103C, 1) # WE ARE FORCING THINGS ON!
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# do_everything()
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# find_a5_offset_of_boolean_global(resources)
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do_better(resources)
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open(target, 'wb').write(macresources.make_rez_code(resources, ascii_clean=True))
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