python/Modules/cgen.py at master · charleson/python · GitHub

History

523 lines (485 loc) · 15 KB

Raw

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

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

########################################################################

# See the file "Misc/COPYRIGHT" for information on usage and

# redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.

########################################################################

# Python script to parse cstubs file for gl and generate C stubs.

# usage: python cgen.py <cstubs >glmodule.c

# NOTE: You must first make a python binary without the "GL" option

# before you can run this, when building Python for the first time.

# See comments in the Makefile.

# XXX BUG return arrays generate wrong code

# XXX need to change error returns into gotos to free mallocked arrays

from warnings import warnpy3k

warnpy3k("the cgen module has been removed in Python 3.0", stacklevel=2)

del warnpy3k

import string

import sys

# Function to print to stderr

def err(*args):

savestdout = sys.stdout

try:

sys.stdout = sys.stderr

for i in args:

print i,

finally:

sys.stdout = savestdout

# The set of digits that form a number

digits = '0123456789'

# Function to extract a string of digits from the front of the string.

# Returns the leading string of digits and the remaining string.

# If no number is found, returns '' and the original string.

def getnum(s):

n = ''

while s and s[0] in digits:

n = n + s[0]

s = s[1:]

return n, s

# Function to check if a string is a number

def isnum(s):

if not s: return False

for c in s:

if not c in digits: return False

return True

# Allowed function return types

return_types = ['void', 'short', 'long']

# Allowed function argument types

arg_types = ['char', 'string', 'short', 'u_short', 'float', 'long', 'double']

# Need to classify arguments as follows

# simple input variable

# simple output variable

# input array

# output array

# input giving size of some array

# Array dimensions can be specified as follows

# constant

# argN

# constant * argN

# retval

# constant * retval

# The dimensions given as constants * something are really

# arrays of points where points are 2- 3- or 4-tuples

# We have to consider three lists:

# python input arguments

# C stub arguments (in & out)

# python output arguments (really return values)

# There is a mapping from python input arguments to the input arguments

# of the C stub, and a further mapping from C stub arguments to the

# python return values

# Exception raised by checkarg() and generate()

arg_error = 'bad arg'

# Function to check one argument.

# Arguments: the type and the arg "name" (really mode plus subscript).

# Raises arg_error if something's wrong.

# Return type, mode, factor, rest of subscript; factor and rest may be empty.

def checkarg(type, arg):

# Turn "char *x" into "string x".

if type == 'char' and arg[0] == '*':

type = 'string'

arg = arg[1:]

# Check that the type is supported.

if type not in arg_types:

raise arg_error, ('bad type', type)

if type[:2] == 'u_':

type = 'unsigned ' + type[2:]

# Split it in the mode (first character) and the rest.

mode, rest = arg[:1], arg[1:]

# The mode must be 's' for send (= input) or 'r' for return argument.

if mode not in ('r', 's'):

raise arg_error, ('bad arg mode', mode)

# Is it a simple argument: if so, we are done.

if not rest:

return type, mode, '', ''

# Not a simple argument; must be an array.

# The 'rest' must be a subscript enclosed in [ and ].

# The subscript must be one of the following forms,

# otherwise we don't handle it (where N is a number):

# N

# argN

# retval

# N*argN

# N*retval

if rest[:1] <> '[' or rest[-1:] <> ']':

raise arg_error, ('subscript expected', rest)

sub = rest[1:-1]

# Is there a leading number?

num, sub = getnum(sub)

if num:

# There is a leading number

if not sub:

# The subscript is just a number

return type, mode, num, ''

if sub[:1] == '*':

# There is a factor prefix

sub = sub[1:]

else:

raise arg_error, ('\'*\' expected', sub)

if sub == 'retval':

# size is retval -- must be a reply argument

if mode <> 'r':

raise arg_error, ('non-r mode with [retval]', mode)

elif not isnum(sub) and (sub[:3] <> 'arg' or not isnum(sub[3:])):

raise arg_error, ('bad subscript', sub)

return type, mode, num, sub

# List of functions for which we have generated stubs

functions = []

# Generate the stub for the given function, using the database of argument

# information build by successive calls to checkarg()

def generate(type, func, database):

# Check that we can handle this case:

# no variable size reply arrays yet

n_in_args = 0

n_out_args = 0

for a_type, a_mode, a_factor, a_sub in database:

if a_mode == 's':

n_in_args = n_in_args + 1

elif a_mode == 'r':

n_out_args = n_out_args + 1

else:

# Can't happen

raise arg_error, ('bad a_mode', a_mode)

if (a_mode == 'r' and a_sub) or a_sub == 'retval':

err('Function', func, 'too complicated:',

a_type, a_mode, a_factor, a_sub)

print '/* XXX Too complicated to generate code for */'

return

functions.append(func)

# Stub header

print 'static PyObject *'

print 'gl_' + func + '(self, args)'

print '\tPyObject *self;'

print '\tPyObject *args;'

print '{'

# Declare return value if any

if type <> 'void':

print '\t' + type, 'retval;'

# Declare arguments

for i in range(len(database)):

a_type, a_mode, a_factor, a_sub = database[i]

print '\t' + a_type,

brac = ket = ''

if a_sub and not isnum(a_sub):

if a_factor:

brac = '('

ket = ')'

print brac + '*',

print 'arg' + repr(i+1) + ket,

if a_sub and isnum(a_sub):

print '[', a_sub, ']',

if a_factor:

print '[', a_factor, ']',

print ';'

# Find input arguments derived from array sizes

for i in range(len(database)):

a_type, a_mode, a_factor, a_sub = database[i]

if a_mode == 's' and a_sub[:3] == 'arg' and isnum(a_sub[3:]):

# Sending a variable-length array

n = eval(a_sub[3:])

if 1 <= n <= len(database):

b_type, b_mode, b_factor, b_sub = database[n-1]

if b_mode == 's':

database[n-1] = b_type, 'i', a_factor, repr(i)

n_in_args = n_in_args - 1

# Assign argument positions in the Python argument list

in_pos = []

i_in = 0

for i in range(len(database)):

a_type, a_mode, a_factor, a_sub = database[i]

if a_mode == 's':

in_pos.append(i_in)

i_in = i_in + 1

else:

in_pos.append(-1)

# Get input arguments

for i in range(len(database)):

a_type, a_mode, a_factor, a_sub = database[i]

if a_type[:9] == 'unsigned ':

xtype = a_type[9:]

else:

xtype = a_type

if a_mode == 'i':

# Implicit argument;

# a_factor is divisor if present,

# a_sub indicates which arg (`database index`)

j = eval(a_sub)

print '\tif',

print '(!geti' + xtype + 'arraysize(args,',

print repr(n_in_args) + ',',

print repr(in_pos[j]) + ',',

if xtype <> a_type:

print '('+xtype+' *)',

print '&arg' + repr(i+1) + '))'

print '\t\treturn NULL;'

if a_factor:

print '\targ' + repr(i+1),

print '= arg' + repr(i+1),

print '/', a_factor + ';'

elif a_mode == 's':

if a_sub and not isnum(a_sub):

# Allocate memory for varsize array

print '\tif ((arg' + repr(i+1), '=',

if a_factor:

print '('+a_type+'(*)['+a_factor+'])',

print 'PyMem_NEW(' + a_type, ',',

if a_factor:

print a_factor, '*',

print a_sub, ')) == NULL)'

print '\t\treturn PyErr_NoMemory();'

print '\tif',

if a_factor or a_sub: # Get a fixed-size array array

print '(!geti' + xtype + 'array(args,',

print repr(n_in_args) + ',',

print repr(in_pos[i]) + ',',

if a_factor: print a_factor,

if a_factor and a_sub: print '*',

if a_sub: print a_sub,

print ',',

if (a_sub and a_factor) or xtype <> a_type:

print '('+xtype+' *)',

print 'arg' + repr(i+1) + '))'

else: # Get a simple variable

print '(!geti' + xtype + 'arg(args,',

print repr(n_in_args) + ',',

print repr(in_pos[i]) + ',',

if xtype <> a_type:

print '('+xtype+' *)',

print '&arg' + repr(i+1) + '))'

print '\t\treturn NULL;'

# Begin of function call

if type <> 'void':

print '\tretval =', func + '(',

else:

print '\t' + func + '(',

# Argument list

for i in range(len(database)):

if i > 0: print ',',

a_type, a_mode, a_factor, a_sub = database[i]

if a_mode == 'r' and not a_factor:

print '&',

print 'arg' + repr(i+1),

# End of function call

print ');'

# Free varsize arrays

for i in range(len(database)):

a_type, a_mode, a_factor, a_sub = database[i]

if a_mode == 's' and a_sub and not isnum(a_sub):

print '\tPyMem_DEL(arg' + repr(i+1) + ');'

# Return

if n_out_args:

# Multiple return values -- construct a tuple

if type <> 'void':

n_out_args = n_out_args + 1

if n_out_args == 1:

for i in range(len(database)):

a_type, a_mode, a_factor, a_sub = database[i]

if a_mode == 'r':

break

else:

raise arg_error, 'expected r arg not found'

print '\treturn',

print mkobject(a_type, 'arg' + repr(i+1)) + ';'

else:

print '\t{ PyObject *v = PyTuple_New(',

print n_out_args, ');'

print '\t if (v == NULL) return NULL;'

i_out = 0

if type <> 'void':

print '\t PyTuple_SetItem(v,',

print repr(i_out) + ',',

print mkobject(type, 'retval') + ');'

i_out = i_out + 1

for i in range(len(database)):

a_type, a_mode, a_factor, a_sub = database[i]

if a_mode == 'r':

print '\t PyTuple_SetItem(v,',

print repr(i_out) + ',',

s = mkobject(a_type, 'arg' + repr(i+1))

print s + ');'

i_out = i_out + 1

print '\t return v;'

print '\t}'

else:

# Simple function return

# Return None or return value

if type == 'void':

print '\tPy_INCREF(Py_None);'

print '\treturn Py_None;'

else:

print '\treturn', mkobject(type, 'retval') + ';'

# Stub body closing brace

print '}'

# Subroutine to return a function call to mknew<type>object(<arg>)

def mkobject(type, arg):

if type[:9] == 'unsigned ':

type = type[9:]

return 'mknew' + type + 'object((' + type + ') ' + arg + ')'

return 'mknew' + type + 'object(' + arg + ')'

defined_archs = []

# usage: cgen [ -Dmach ... ] [ file ]

for arg in sys.argv[1:]:

if arg[:2] == '-D':

defined_archs.append(arg[2:])

else:

# Open optional file argument

sys.stdin = open(arg, 'r')

# Input line number

lno = 0

# Input is divided in two parts, separated by a line containing '%%'.

# <part1> -- literally copied to stdout

# <part2> -- stub definitions

# Variable indicating the current input part.

part = 1

# Main loop over the input

while 1:

try:

line = raw_input()

except EOFError:

break

lno = lno+1

words = string.split(line)

if part == 1:

# In part 1, copy everything literally

# except look for a line of just '%%'

if words == ['%%']:

part = part + 1

else:

# Look for names of manually written

# stubs: a single percent followed by the name

# of the function in Python.

# The stub name is derived by prefixing 'gl_'.

if words and words[0][0] == '%':

func = words[0][1:]

if (not func) and words[1:]:

func = words[1]

if func:

functions.append(func)

else:

print line

continue

if not words:

continue # skip empty line

elif words[0] == 'if':

# if XXX rest

# if !XXX rest

if words[1][0] == '!':

if words[1][1:] in defined_archs:

continue

elif words[1] not in defined_archs:

continue

words = words[2:]

if words[0] == '#include':

print line

elif words[0][:1] == '#':

pass # ignore comment

elif words[0] not in return_types:

err('Line', lno, ': bad return type :', words[0])

elif len(words) < 2:

err('Line', lno, ': no funcname :', line)

else:

if len(words) % 2 <> 0:

err('Line', lno, ': odd argument list :', words[2:])

else:

database = []

try:

for i in range(2, len(words), 2):

x = checkarg(words[i], words[i+1])

database.append(x)

print '/*',

for w in words: print w,

print '*/'

generate(words[0], words[1], database)

except arg_error, msg:

err('Line', lno, ':', msg)

print 'static struct PyMethodDef gl_methods[] = {'

for func in functions:

print '\t{"' + func + '", gl_' + func + '},'

print '\t{NULL, NULL} /* Sentinel */'

print '};'

print 'void'

print 'initgl()'

print '{'

print '\t(void) Py_InitModule("gl", gl_methods);'

print '}'

python/Modules/cgen.py at master · charleson/python · GitHub

Expand file tree

Breadcrumbs

cgen.py

Latest commit

History

Breadcrumbs

cgen.py

File metadata and controls