~rabbits/uxn

ref: 41eb23e2c2e9f7952f33725df091ee1471640dc6 uxn/etc/mkuxn-fast.moon -rw-r--r-- 8.4 KiB
41eb23e2neauoire Added missing boot function 4 months ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
--
-- Uxn core unroller script
--
-- This script updates src/uxn-fast.c when Uxn's opcode set changes, so that
-- updates in the human-readable src/uxn.c core can be easily converted into
-- high-performance code.
--
-- To run, you need Lua or LuaJIT, and just run etc/mkuxn-fast.lua from the top
-- directory of Uxn's git repository:
--
--     lua etc/mkuxn-fast.lua
--
-- This file is written in MoonScript, which is a language that compiles to
-- Lua, the same way as e.g. CoffeeScript compiles to JavaScript. Since
-- installing MoonScript has more dependencies than Lua, the compiled
-- etc/mkuxn-fast.lua is kept in Uxn's repository and will be kept updated as
-- this file changes.
--

replacements =
	op_and16: '{ Uint8 a = pop8(u->src), b = pop8(u->src), c = pop8(u->src), d = pop8(u->src); push8(u->src, d & b); push8(u->src, c & a); }'
	op_ora16: '{ Uint8 a = pop8(u->src), b = pop8(u->src), c = pop8(u->src), d = pop8(u->src); push8(u->src, d | b); push8(u->src, c | a); }'
	op_eor16: '{ Uint8 a = pop8(u->src), b = pop8(u->src), c = pop8(u->src), d = pop8(u->src); push8(u->src, d ^ b); push8(u->src, c ^ a); }'
	op_lit16: '{ push8(u->src, mempeek8(u->ram.dat, u->ram.ptr++)); push8(u->src, mempeek8(u->ram.dat, u->ram.ptr++)); }'
	op_swp16: '{ Uint8 a = pop8(u->src), b = pop8(u->src), c = pop8(u->src), d = pop8(u->src); push8(u->src, b); push8(u->src, a); push8(u->src, d); push8(u->src, c); }'
	op_ovr16: '{ Uint8 a = pop8(u->src), b = pop8(u->src), c = pop8(u->src), d = pop8(u->src); push8(u->src, d); push8(u->src, c); push8(u->src, b); push8(u->src, a); push8(u->src, d); push8(u->src, c); }'
	op_dup16: '{ Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b); push8(u->src, a); push8(u->src, b); push8(u->src, a); }'
	op_rot16: '{ Uint8 a = pop8(u->src), b = pop8(u->src), c = pop8(u->src), d = pop8(u->src), e = pop8(u->src), f = pop8(u->src); push8(u->src, d); push8(u->src, c); push8(u->src, b); push8(u->src, a); push8(u->src, f); push8(u->src, e); }'
	op_sth16: '{ Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->dst, b); push8(u->dst, a); }'

local top, bottom, pushtop

offset = (n, s = '') ->
	if n < 0
		' -%s %d'\format s, -n
	elseif n > 0
		' +%s %d'\format s, n
	elseif s != ''
		' +%s 0'\format s
	else
		''

pop_push = (k, n, s) ->
	switch k
		when 'pop'
			s = s\match '^%((%S+)%)$'
			assert s == 'src'
			switch n
				when '8'
					top[s] -= 1
					if bottom[s] > top[s]
						bottom[s] = top[s]
					'%s.dat[%s.ptr%s]'\format s, s, offset(top[s])
				when '16'
					top[s] -= 2
					if bottom[s] > top[s]
						bottom[s] = top[s]
					'(%s.dat[%s.ptr%s] | (%s.dat[%s.ptr%s] << 8))'\format s, s, offset(top[s] + 1), s, s, offset(top[s])
		when 'push'
			s, v = s\match '^%((%S+), (.*)%)$'
			assert s == 'src' or s == 'dst', s
			switch n
				when '8'
					pushtop[s] += 1
					'%s.dat[%s.ptr%s] = %s'\format s, s, offset(pushtop[s] - 1), v
				when '16'
					if v\match'%+%+' or v\match'%-%-'
						error 'push16 has side effects: ' .. v
					peek, args = v\match '^([md]e[mv]peek)16(%b())$'
					if peek
						args = args\sub 2, -2
						return pop_push('push', '8', '(%s, %s8(%s))'\format s, peek, args) .. ';\n' .. pop_push('push', '8', '(%s, %s8(%s + 1))'\format s, peek, args)
					pushtop[s] += 2
					if v\match ' '
						v = '(' .. v .. ')'
					'%s.dat[%s.ptr%s] = %s >> 8;\n%s.dat[%s.ptr%s] = %s & 0xff'\format s, s, offset(pushtop[s] - 2), v, s, s, offset(pushtop[s] - 1), v
		else
			nil

indented_block = (s) ->
	s = s\gsub('^%{ *', '{\n')\gsub('\n', '\n\t')\gsub('\t%} *$', '}\n')
	s = s\gsub('\n[^\n]+%.error = [^\n]+', '%0\n#ifndef NO_STACK_CHECKS\n\tgoto error;\n#endif')
	s

process = (body) ->
	out_body = body\gsub('^%{ *', '')\gsub(' *%}$', '')\gsub('; ', ';\n')\gsub('%b{} *', indented_block)\gsub '(%a+)(%d+)(%b())', pop_push
	in_ifdef = false
	for k in *{'src', 'dst'}
		if bottom[k] != 0
			if not in_ifdef
				out_body ..= '\n#ifndef NO_STACK_CHECKS'
				in_ifdef = true
			out_body ..= '\nif(__builtin_expect(%s.ptr < %d, 0)) {\n\t%s.error = 1;\n\tgoto error;\n}'\format k, -bottom[k], k
		if pushtop[k] != 0
			if pushtop[k] > 0
				if not in_ifdef
					out_body ..= '\n#ifndef NO_STACK_CHECKS'
					in_ifdef = true
				out_body ..= '\nif(__builtin_expect(%s.ptr > %d, 0)) {\n\t%s.error = 2;\n\tgoto error;\n}'\format k, 255 - pushtop[k], k
			if in_ifdef
				out_body ..= '\n#endif'
				in_ifdef = false
			out_body ..= '\n%s.ptr %s= %d;'\format k, pushtop[k] < 0 and '-' or '+', math.abs pushtop[k]
	if in_ifdef
		out_body ..= '\n#endif'
		in_ifdef = false
	t = {}
	out_body\gsub '[^%w_]([a-f]) = (src%.dat%[[^]]+%])[,;]', (v, k) -> t[k] = v
	out_body = out_body\gsub '(src%.dat%[[^]]+%]) = ([a-f]);\n', (k, v) ->
		if t[k] and t[k] == v
			return ''
		return nil
	out_body

ops = {}

for l in assert io.lines 'src/uxn.c'
	name, body = l\match 'void (op_%S*)%(Uxn %*u%) (%b{})'
	if not name
		continue
	if replacements[name]
		body = replacements[name]
	body = body\gsub 'u%-%>src%-%>', 'src.'
	body = body\gsub 'u%-%>dst%-%>', 'dst.'
	body = body\gsub 'u%-%>src', 'src'
	body = body\gsub 'u%-%>dst', 'dst'
	top = { src: 0, dst: 0 }
	bottom = { src: 0, dst: 0 }
	pushtop = top
	ops[name] = process body
	top = { src: 0, dst: 0 }
	bottom = { src: 0, dst: 0 }
	pushtop = { src: 0, dst: 0 }
	ops['keep_' .. name] = process body

dump = (s, src, dst) ->
	ret = '\t\t\t{\n'
	for l in s\gmatch '[^\n]+'
		if not l\match '^%#'
			ret ..= '\t\t\t\t'
		ret ..= '%s\n'\format l
	ret ..= '\t\t\t}\n\t\t\tbreak;\n'
	(ret\gsub('src', src)\gsub('dst', dst))

i = 0
allops = {}
wanted = false
for l in assert io.lines 'src/uxn.c'
	if l == 'void (*ops[])(Uxn *u) = {'
		wanted = true
	elseif l == '};'
		wanted = false
	elseif wanted
		l = l\gsub '%/%b**%/', ''
		for op in l\gmatch '[%w_]+'
			if not ops[op]
				error 'missing ' .. op
			allops[i + 0x00 + 1] = { n: { i + 0x00 }, body: dump ops[op], 'u->wst', 'u->rst' }
			allops[i + 0x40 + 1] = { n: { i + 0x40 }, body: dump ops[op], 'u->rst', 'u->wst' }
			allops[i + 0x80 + 1] = { n: { i + 0x80 }, body: dump ops['keep_' .. op], 'u->wst', 'u->rst' }
			allops[i + 0xc0 + 1] = { n: { i + 0xc0 }, body: dump ops['keep_' .. op], 'u->rst', 'u->wst' }
			i += 1

i = 0
wanted = false
for l in assert io.lines 'src/uxnasm.c'
	if l == 'static char ops[][4] = {'
		wanted = true
	elseif l == '};'
		wanted = false
	elseif wanted
		for op in l\gmatch '"(...)"'
			i += 1
			allops[i + 0x00].name = op
			allops[i + 0x20].name = op .. '2'
			allops[i + 0x40].name = op .. 'r'
			allops[i + 0x60].name = op .. '2r'
			allops[i + 0x80].name = op .. 'k'
			allops[i + 0xa0].name = op .. '2k'
			allops[i + 0xc0].name = op .. 'kr'
			allops[i + 0xe0].name = op .. '2kr'

for i = 1, 256
	if not allops[i]
		continue
	for j = i + 1, 256
		if allops[i].body == allops[j].body
			table.insert allops[i].n, (table.remove allops[j].n)
			allops[j].body = nil

with assert io.open 'src/uxn-fast.c', 'w'
	f = assert io.open 'src/uxn.c'
	while true
		l = f\read '*l'
		\write '%s\n'\format l
		if l == '*/'
			break
	\write '\n'
	\write [[
/*
 ^
/!\ THIS FILE IS AUTOMATICALLY GENERATED
---

Its contents can get overwritten with the processed contents of src/uxn.c.
See etc/mkuxn-fast.moon for instructions.

*/
]]
	wanted = true
	while true
		l = f\read '*l'
		if l\match' push' or l\match'[ *]pop'
			continue
		if l == '/* Stack */'
			wanted = false
		if l\match 'errors%[%]'
			\write '\n#ifndef NO_STACK_CHECKS\n'
			wanted = true
		if wanted
			\write '%s\n'\format l
		if l == '}'
			\write '#endif\n\n'
			break
	\write [[
/* clang-format on */

#pragma mark - Core

int
evaluxn(Uxn *u, Uint16 vec)
{
	Uint8 instr;
	u->ram.ptr = vec;
	if(u->wst.ptr > 0xf8) u->wst.ptr = 0xf8;
	while(u->ram.ptr) {
		instr = u->ram.dat[u->ram.ptr++];
		switch(instr) {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-value"
#pragma GCC diagnostic ignored "-Wunused-variable"
]]
	for i = 1, 256
		if not allops[i].body
			continue
		for n in *allops[i].n
			\write '\t\tcase 0x%02x: /* %s */\n'\format n, allops[n + 1].name
		\write '\t\t\t__asm__("evaluxn_%02x_%s:");\n'\format allops[i].n[1], allops[i].name
		\write allops[i].body
	\write [[
#pragma GCC diagnostic pop
		}
	}
	return 1;
#ifndef NO_STACK_CHECKS
error:
	if(u->wst.error)
		return haltuxn(u, u->wst.error, "Working-stack", instr);
	else
		return haltuxn(u, u->rst.error, "Return-stack", instr);
#endif
}

int
]]
	wanted = false
	while true
		l = f\read '*l'
		if not l
			break
		if l\match '^bootuxn'
			wanted = true
		if wanted
			\write '%s\n'\format l
	f\close!
	\close!