1 # Based on GardenSnake - a parser generator demonstration program
2 # GardenSnake was released into the Public Domain by Andrew Dalke.
4 # Portions of this work are derived from Python's Grammar definition
5 # and may be covered under the Python copyright and license
7 # Andrew Dalke / Dalke Scientific Software, LLC
8 # 30 August 2006 / Cape Town, South Africa
10 # Modifications for inclusion in PLY distribution
12 from pprint
import pprint
14 from ply
import lex
, yacc
18 from soc
.decoder
.power_decoder
import create_pdecode
19 from nmigen
.back
.pysim
import Simulator
, Delay
20 from nmigen
import Module
, Signal
22 from soc
.decoder
.pseudo
.parser
import GardenSnakeCompiler
23 from soc
.decoder
.selectable_int
import SelectableInt
, selectconcat
25 ####### Test code #######
30 index <- (RS)[8*i:8*i+7]
31 RA <- [0]*56 || perm[0:7]
36 if index < 64 then index <- 0
47 index <- (RS)[8*i:8*i+7]
52 RA <- [0]*56|| perm[0:7]
59 if (RS)[63-n] = 0b1 then
69 else if a > EXTS(SI) then
78 in_range <- ((x | y) &
80 in_range <- (x + y) - (a + b)
85 src1 <- EXTZ((RA)[56:63])
87 in_range <- src21lo <= src1 & src1 <= src21hi
101 RT <- (RA) + EXTS(SI || [0]*16)
123 l
.append(1 if (num
& (1 << i
)) else 0)
128 def get_reg_hex(reg
):
129 return hex(reg
.value
)
133 def __init__(self
, sd
, regfile
):
137 self
[i
] = SelectableInt(regfile
[i
], 64)
139 def set_form(self
, form
):
142 def getz(self
, rnum
):
143 #rnum = rnum.value # only SelectableInt allowed
144 print("GPR getzero", rnum
)
146 return SelectableInt(0, 64)
149 def _get_regnum(self
, attr
):
150 getform
= self
.sd
.sigforms
[self
.form
]
151 rnum
= getattr(getform
, attr
)
154 def ___getitem__(self
, attr
):
155 print("GPR getitem", attr
)
156 rnum
= self
._get
_regnum
(attr
)
157 return self
.regfile
[rnum
]
160 def convert_to_python(pcode
):
162 gsc
= GardenSnakeCompiler()
164 tree
= gsc
.compile(pcode
, mode
="exec", filename
="string")
165 tree
= ast
.fix_missing_locations(tree
)
166 regsused
= {'read_regs': gsc
.parser
.read_regs
,
167 'write_regs': gsc
.parser
.write_regs
,
168 'uninit_regs': gsc
.parser
.uninit_regs
}
169 return astor
.to_source(tree
), regsused
174 gsc
= GardenSnakeCompiler()
176 # XXX unused! see GPR instead
180 gsc
.gpr
= GPR(gsc
.parser
.sd
, gsc
.regfile
)
182 _compile
= gsc
.compile
184 tree
= _compile(code
, mode
="single", filename
="string")
185 tree
= ast
.fix_missing_locations(tree
)
186 print(ast
.dump(tree
))
189 print(astor
.dump_tree(tree
))
191 source
= astor
.to_source(tree
)
196 # Set up the GardenSnake run-time environment
199 print("-->", " ".join(map(str, args
)))
201 from soc
.decoder
.helpers
import (EXTS64
, EXTZ64
, ROTL64
, ROTL32
, MASK
,)
207 d
["SelectableInt"] = SelectableInt
208 d
["concat"] = selectconcat
212 gsc
.gpr
.set_form(form
)
213 getform
= gsc
.parser
.sd
.sigforms
[form
]._asdict
()
214 #print ("getform", form)
215 # for k, f in getform.items():
219 compiled_code
= compile(source
, mode
="exec", filename
="<string>")
223 instruction
= Signal(32)
225 m
.submodules
.decode
= decode
= gsc
.parser
.sd
226 comb
+= decode
.raw_opcode_in
.eq(instruction
)
233 print("0x{:X}".format(ins
& 0xffffffff))
235 # ask the decoder to decode this binary data (endian'd)
236 yield decode
.bigendian
.eq(0) # little / big?
237 yield instruction
.eq(ins
) # raw binary instr.
240 # uninitialised regs, drop them into dict for function
241 for rname
in gsc
.parser
.uninit_regs
:
242 d
[rname
] = SelectableInt(0, 64) # uninitialised (to zero)
243 print("uninitialised", rname
, get_reg_hex(d
[rname
]))
245 # read regs, drop them into dict for function
246 for rname
in gsc
.parser
.read_regs
:
247 regidx
= yield getattr(decode
.sigforms
['X'], rname
)
248 d
[rname
] = gsc
.gpr
[regidx
] # contents of regfile
249 d
["_%s" % rname
] = regidx
# actual register value
250 print("read reg", rname
, regidx
, get_reg_hex(d
[rname
]))
252 exec(compiled_code
, d
) # code gets executed here in dict "d"
255 print(d
.keys()) # shows the variables that may have been created
257 print(decode
.sigforms
['X'])
258 x
= yield decode
.sigforms
['X'].RS
259 ra
= yield decode
.sigforms
['X'].RA
260 print("RA", ra
, d
['RA'])
263 for wname
in gsc
.parser
.write_regs
:
266 print("write regs", regidx
, wname
, d
[wname
], reg
)
267 gsc
.gpr
[regidx
] = d
[wname
]
269 sim
.add_process(process
)
270 with sim
.write_vcd("simulator.vcd", "simulator.gtkw",
271 traces
=decode
.ports()):
274 for i
in range(len(gsc
.gpr
)):
275 print("regfile", i
, get_reg_hex(gsc
.gpr
[i
]))
278 if __name__
== '__main__':