| paul@0 | 1 | #!/usr/bin/env python |
| paul@0 | 2 | |
| paul@0 | 3 | """ |
| paul@0 | 4 | Encoder functions, producing representations of program objects. |
| paul@0 | 5 | |
| paul@0 | 6 | Copyright (C) 2016 Paul Boddie <paul@boddie.org.uk> |
| paul@0 | 7 | |
| paul@0 | 8 | This program is free software; you can redistribute it and/or modify it under |
| paul@0 | 9 | the terms of the GNU General Public License as published by the Free Software |
| paul@0 | 10 | Foundation; either version 3 of the License, or (at your option) any later |
| paul@0 | 11 | version. |
| paul@0 | 12 | |
| paul@0 | 13 | This program is distributed in the hope that it will be useful, but WITHOUT |
| paul@0 | 14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| paul@0 | 15 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
| paul@0 | 16 | details. |
| paul@0 | 17 | |
| paul@0 | 18 | You should have received a copy of the GNU General Public License along with |
| paul@0 | 19 | this program. If not, see <http://www.gnu.org/licenses/>. |
| paul@0 | 20 | """ |
| paul@0 | 21 | |
| paul@56 | 22 | from common import first |
| paul@56 | 23 | |
| paul@0 | 24 | # Output encoding and decoding for the summary files. |
| paul@0 | 25 | |
| paul@0 | 26 | def encode_attrnames(attrnames): |
| paul@0 | 27 | |
| paul@0 | 28 | "Encode the 'attrnames' representing usage." |
| paul@0 | 29 | |
| paul@0 | 30 | return ", ".join(attrnames) or "{}" |
| paul@0 | 31 | |
| paul@0 | 32 | def encode_constrained(constrained): |
| paul@0 | 33 | |
| paul@0 | 34 | "Encode the 'constrained' status for program summaries." |
| paul@0 | 35 | |
| paul@0 | 36 | return constrained and "constrained" or "deduced" |
| paul@0 | 37 | |
| paul@0 | 38 | def encode_usage(usage): |
| paul@0 | 39 | |
| paul@0 | 40 | "Encode attribute details from 'usage'." |
| paul@0 | 41 | |
| paul@0 | 42 | all_attrnames = [] |
| paul@0 | 43 | for t in usage: |
| paul@107 | 44 | attrname, invocation, assignment = t |
| paul@107 | 45 | all_attrnames.append("%s%s" % (attrname, invocation and "!" or assignment and "=" or "")) |
| paul@0 | 46 | return ", ".join(all_attrnames) or "{}" |
| paul@0 | 47 | |
| paul@88 | 48 | def decode_usage(s): |
| paul@88 | 49 | |
| paul@88 | 50 | "Decode attribute details from 's'." |
| paul@88 | 51 | |
| paul@88 | 52 | all_attrnames = set() |
| paul@88 | 53 | for attrname_str in s.split(", "): |
| paul@107 | 54 | all_attrnames.add((attrname_str.rstrip("!="), attrname_str.endswith("!"), attrname_str.endswith("="))) |
| paul@88 | 55 | |
| paul@88 | 56 | all_attrnames = list(all_attrnames) |
| paul@88 | 57 | all_attrnames.sort() |
| paul@88 | 58 | return tuple(all_attrnames) |
| paul@88 | 59 | |
| paul@0 | 60 | def encode_access_location(t): |
| paul@0 | 61 | |
| paul@0 | 62 | "Encode the access location 't'." |
| paul@0 | 63 | |
| paul@0 | 64 | path, name, attrname, version = t |
| paul@0 | 65 | return "%s %s %s:%d" % (path, name or "{}", attrname, version) |
| paul@0 | 66 | |
| paul@0 | 67 | def encode_location(t): |
| paul@0 | 68 | |
| paul@0 | 69 | "Encode the general location 't' in a concise form." |
| paul@0 | 70 | |
| paul@0 | 71 | path, name, attrname, version = t |
| paul@0 | 72 | if name is not None and version is not None: |
| paul@0 | 73 | return "%s %s:%d" % (path, name, version) |
| paul@0 | 74 | elif name is not None: |
| paul@0 | 75 | return "%s %s" % (path, name) |
| paul@0 | 76 | else: |
| paul@0 | 77 | return "%s :%s" % (path, attrname) |
| paul@0 | 78 | |
| paul@0 | 79 | def encode_modifiers(modifiers): |
| paul@0 | 80 | |
| paul@0 | 81 | "Encode assignment details from 'modifiers'." |
| paul@0 | 82 | |
| paul@0 | 83 | all_modifiers = [] |
| paul@0 | 84 | for t in modifiers: |
| paul@0 | 85 | all_modifiers.append(encode_modifier_term(t)) |
| paul@0 | 86 | return "".join(all_modifiers) |
| paul@0 | 87 | |
| paul@0 | 88 | def encode_modifier_term(t): |
| paul@0 | 89 | |
| paul@0 | 90 | "Encode modifier 't' representing assignment status." |
| paul@0 | 91 | |
| paul@117 | 92 | assignment, invocation = t |
| paul@117 | 93 | return assignment and "=" or invocation and "!" or "_" |
| paul@0 | 94 | |
| paul@0 | 95 | def decode_modifier_term(s): |
| paul@0 | 96 | |
| paul@0 | 97 | "Decode modifier term 's' representing assignment status." |
| paul@0 | 98 | |
| paul@117 | 99 | return (s == "=", s == "!") |
| paul@0 | 100 | |
| paul@56 | 101 | |
| paul@56 | 102 | |
| paul@56 | 103 | # Test generation functions. |
| paul@56 | 104 | |
| paul@56 | 105 | def get_kinds(all_types): |
| paul@56 | 106 | |
| paul@56 | 107 | """ |
| paul@56 | 108 | Return object kind details for 'all_types', being a collection of |
| paul@56 | 109 | references for program types. |
| paul@56 | 110 | """ |
| paul@56 | 111 | |
| paul@56 | 112 | return map(lambda ref: ref.get_kind(), all_types) |
| paul@56 | 113 | |
| paul@56 | 114 | def test_for_kind(prefix, kind): |
| paul@56 | 115 | |
| paul@56 | 116 | "Return a test condition identifier featuring 'prefix' and 'kind'." |
| paul@56 | 117 | |
| paul@56 | 118 | return "%s-%s" % (prefix, kind == "<instance>" and "instance" or "type") |
| paul@56 | 119 | |
| paul@56 | 120 | def test_for_kinds(prefix, all_kinds): |
| paul@56 | 121 | |
| paul@56 | 122 | """ |
| paul@67 | 123 | Return an identifier describing test conditions incorporating the given |
| paul@56 | 124 | 'prefix' and involving 'all_kinds', being a collection of object kinds. |
| paul@56 | 125 | """ |
| paul@56 | 126 | |
| paul@56 | 127 | return test_for_kind(prefix, first(all_kinds)) |
| paul@56 | 128 | |
| paul@67 | 129 | def test_for_type(prefix, ref): |
| paul@56 | 130 | |
| paul@56 | 131 | """ |
| paul@67 | 132 | Return an identifier describing a test condition incorporating the given |
| paul@67 | 133 | 'prefix' and involving 'ref', being a program type reference. The kind of |
| paul@67 | 134 | the reference is employed in the identifier. |
| paul@56 | 135 | """ |
| paul@56 | 136 | |
| paul@67 | 137 | return test_for_kind(prefix, ref.get_kind()) |
| paul@56 | 138 | |
| paul@56 | 139 | |
| paul@56 | 140 | |
| paul@94 | 141 | # Instruction representation encoding. |
| paul@94 | 142 | |
| paul@94 | 143 | def encode_instruction(instruction): |
| paul@94 | 144 | |
| paul@94 | 145 | """ |
| paul@94 | 146 | Encode the 'instruction' - a sequence starting with an operation and |
| paul@94 | 147 | followed by arguments, each of which may be an instruction sequence or a |
| paul@94 | 148 | plain value - to produce a function call string representation. |
| paul@94 | 149 | """ |
| paul@94 | 150 | |
| paul@94 | 151 | op = instruction[0] |
| paul@94 | 152 | args = instruction[1:] |
| paul@94 | 153 | |
| paul@94 | 154 | if args: |
| paul@94 | 155 | a = [] |
| paul@113 | 156 | for arg in args: |
| paul@113 | 157 | if isinstance(arg, tuple): |
| paul@113 | 158 | a.append(encode_instruction(arg)) |
| paul@94 | 159 | else: |
| paul@113 | 160 | a.append(arg or "{}") |
| paul@94 | 161 | argstr = "(%s)" % ", ".join(a) |
| paul@94 | 162 | return "%s%s" % (op, argstr) |
| paul@94 | 163 | else: |
| paul@94 | 164 | return op |
| paul@94 | 165 | |
| paul@94 | 166 | |
| paul@94 | 167 | |
| paul@0 | 168 | # Output program encoding. |
| paul@0 | 169 | |
| paul@113 | 170 | attribute_ops = ( |
| paul@113 | 171 | "__load_via_class", "__load_via_object", |
| paul@113 | 172 | "__store_via_object", |
| paul@113 | 173 | ) |
| paul@113 | 174 | |
| paul@113 | 175 | checked_ops = ( |
| paul@113 | 176 | "__check_and_load_via_class", "__check_and_load_via_object", "__check_and_load_via_any", |
| paul@113 | 177 | "__check_and_store_via_class", "__check_and_store_via_object", "__check_and_store_via_any", |
| paul@113 | 178 | ) |
| paul@113 | 179 | |
| paul@113 | 180 | typename_ops = ( |
| paul@144 | 181 | "__test_common_instance", "__test_common_object", "__test_common_type", |
| paul@113 | 182 | ) |
| paul@113 | 183 | |
| paul@117 | 184 | encoding_ops = ( |
| paul@117 | 185 | "__encode_callable", |
| paul@117 | 186 | ) |
| paul@117 | 187 | |
| paul@141 | 188 | static_ops = ( |
| paul@141 | 189 | "__load_static", |
| paul@141 | 190 | ) |
| paul@141 | 191 | |
| paul@113 | 192 | def encode_access_instruction(instruction, subs): |
| paul@113 | 193 | |
| paul@113 | 194 | """ |
| paul@113 | 195 | Encode the 'instruction' - a sequence starting with an operation and |
| paul@113 | 196 | followed by arguments, each of which may be an instruction sequence or a |
| paul@113 | 197 | plain value - to produce a function call string representation. |
| paul@113 | 198 | |
| paul@113 | 199 | The 'subs' parameter defines a mapping of substitutions for special values |
| paul@113 | 200 | used in instructions. |
| paul@113 | 201 | """ |
| paul@113 | 202 | |
| paul@113 | 203 | op = instruction[0] |
| paul@113 | 204 | args = instruction[1:] |
| paul@113 | 205 | |
| paul@113 | 206 | if not args: |
| paul@113 | 207 | argstr = "" |
| paul@113 | 208 | |
| paul@113 | 209 | else: |
| paul@113 | 210 | # Encode the arguments. |
| paul@113 | 211 | |
| paul@113 | 212 | a = [] |
| paul@113 | 213 | for arg in args: |
| paul@113 | 214 | a.append(encode_access_instruction_arg(arg, subs)) |
| paul@113 | 215 | |
| paul@113 | 216 | # Modify certain arguments. |
| paul@113 | 217 | |
| paul@113 | 218 | # Convert attribute name arguments to position symbols. |
| paul@113 | 219 | |
| paul@113 | 220 | if op in attribute_ops: |
| paul@113 | 221 | arg = a[1] |
| paul@113 | 222 | a[1] = encode_symbol("pos", arg) |
| paul@113 | 223 | |
| paul@113 | 224 | # Convert attribute name arguments to position and code symbols. |
| paul@113 | 225 | |
| paul@113 | 226 | elif op in checked_ops: |
| paul@113 | 227 | arg = a[1] |
| paul@113 | 228 | a[1] = encode_symbol("pos", arg) |
| paul@113 | 229 | a.insert(2, encode_symbol("code", arg)) |
| paul@113 | 230 | |
| paul@113 | 231 | # Convert type name arguments to position and code symbols. |
| paul@113 | 232 | |
| paul@113 | 233 | elif op in typename_ops: |
| paul@131 | 234 | arg = encode_type_attribute(a[1]) |
| paul@113 | 235 | a[1] = encode_symbol("pos", arg) |
| paul@113 | 236 | a.insert(2, encode_symbol("code", arg)) |
| paul@113 | 237 | |
| paul@117 | 238 | # Replace encoded operations. |
| paul@117 | 239 | |
| paul@117 | 240 | elif op in encoding_ops: |
| paul@117 | 241 | origin = a[0] |
| paul@117 | 242 | kind = a[1] |
| paul@117 | 243 | op = "__load_function" |
| paul@117 | 244 | a = [kind == "<class>" and encode_instantiator_pointer(origin) or encode_function_pointer(origin)] |
| paul@117 | 245 | |
| paul@141 | 246 | # Obtain addresses of static objects. |
| paul@141 | 247 | |
| paul@141 | 248 | elif op in static_ops: |
| paul@141 | 249 | a[0] = "&%s" % a[0] |
| paul@141 | 250 | |
| paul@113 | 251 | argstr = "(%s)" % ", ".join(a) |
| paul@113 | 252 | |
| paul@113 | 253 | # Substitute the first element of the instruction, which may not be an |
| paul@113 | 254 | # operation at all. |
| paul@113 | 255 | |
| paul@144 | 256 | if subs.has_key(op): |
| paul@144 | 257 | op = subs[op] |
| paul@144 | 258 | elif not args: |
| paul@144 | 259 | op = "&%s" % encode_path(op) |
| paul@144 | 260 | |
| paul@144 | 261 | return "%s%s" % (op, argstr) |
| paul@113 | 262 | |
| paul@113 | 263 | def encode_access_instruction_arg(arg, subs): |
| paul@113 | 264 | |
| paul@113 | 265 | "Encode 'arg' using 'subs' to define substitutions." |
| paul@113 | 266 | |
| paul@113 | 267 | if isinstance(arg, tuple): |
| paul@113 | 268 | return encode_access_instruction(arg, subs) |
| paul@113 | 269 | |
| paul@113 | 270 | # Special values only need replacing, not encoding. |
| paul@113 | 271 | |
| paul@113 | 272 | elif subs.has_key(arg): |
| paul@113 | 273 | return subs.get(arg) |
| paul@113 | 274 | |
| paul@113 | 275 | # Other values may need encoding. |
| paul@113 | 276 | |
| paul@113 | 277 | else: |
| paul@113 | 278 | return encode_path(arg) |
| paul@113 | 279 | |
| paul@126 | 280 | def encode_bound_reference(path): |
| paul@126 | 281 | |
| paul@126 | 282 | "Encode 'path' as a bound method name." |
| paul@126 | 283 | |
| paul@126 | 284 | return "__bound_%s" % encode_path(path) |
| paul@126 | 285 | |
| paul@0 | 286 | def encode_function_pointer(path): |
| paul@0 | 287 | |
| paul@0 | 288 | "Encode 'path' as a reference to an output program function." |
| paul@0 | 289 | |
| paul@0 | 290 | return "__fn_%s" % encode_path(path) |
| paul@0 | 291 | |
| paul@149 | 292 | def encode_initialiser_pointer(path): |
| paul@149 | 293 | |
| paul@149 | 294 | "Encode 'path' as a reference to an initialiser function structure." |
| paul@149 | 295 | |
| paul@149 | 296 | return encode_path("%s.__init__" % path) |
| paul@149 | 297 | |
| paul@0 | 298 | def encode_instantiator_pointer(path): |
| paul@0 | 299 | |
| paul@0 | 300 | "Encode 'path' as a reference to an output program instantiator." |
| paul@0 | 301 | |
| paul@0 | 302 | return "__new_%s" % encode_path(path) |
| paul@0 | 303 | |
| paul@136 | 304 | def encode_literal_constant(n): |
| paul@136 | 305 | |
| paul@136 | 306 | "Encode a name for the literal constant with the number 'n'." |
| paul@136 | 307 | |
| paul@136 | 308 | return "__const%d" % n |
| paul@136 | 309 | |
| paul@136 | 310 | def encode_literal_constant_member(value): |
| paul@136 | 311 | |
| paul@136 | 312 | "Encode the member name for the 'value' in the final program." |
| paul@136 | 313 | |
| paul@136 | 314 | return "%svalue" % value.__class__.__name__ |
| paul@136 | 315 | |
| paul@136 | 316 | def encode_literal_constant_value(value): |
| paul@136 | 317 | |
| paul@136 | 318 | "Encode the given 'value' in the final program." |
| paul@136 | 319 | |
| paul@136 | 320 | if isinstance(value, (int, float)): |
| paul@136 | 321 | return str(value) |
| paul@136 | 322 | else: |
| paul@136 | 323 | return '"%s"' % str(value).replace('"', '\\"') |
| paul@136 | 324 | |
| paul@136 | 325 | def encode_literal_reference(n): |
| paul@136 | 326 | |
| paul@136 | 327 | "Encode a reference to a literal constant with the number 'n'." |
| paul@136 | 328 | |
| paul@136 | 329 | return "__constvalue%d" % n |
| paul@136 | 330 | |
| paul@0 | 331 | def encode_path(path): |
| paul@0 | 332 | |
| paul@0 | 333 | "Encode 'path' as an output program object, translating special symbols." |
| paul@0 | 334 | |
| paul@0 | 335 | if path in reserved_words: |
| paul@0 | 336 | return "__%s" % path |
| paul@0 | 337 | else: |
| paul@0 | 338 | return path.replace("#", "__").replace("$", "__").replace(".", "_") |
| paul@0 | 339 | |
| paul@136 | 340 | def encode_predefined_reference(path): |
| paul@136 | 341 | |
| paul@136 | 342 | "Encode a reference to a predefined constant value for 'path'." |
| paul@136 | 343 | |
| paul@136 | 344 | return "__predefined_%s" % encode_path(path) |
| paul@136 | 345 | |
| paul@0 | 346 | def encode_symbol(symbol_type, path=None): |
| paul@0 | 347 | |
| paul@0 | 348 | "Encode a symbol with the given 'symbol_type' and optional 'path'." |
| paul@0 | 349 | |
| paul@0 | 350 | return "__%s%s" % (symbol_type, path and "_%s" % encode_path(path) or "") |
| paul@0 | 351 | |
| paul@131 | 352 | def encode_type_attribute(path): |
| paul@131 | 353 | |
| paul@131 | 354 | "Encode the special type attribute for 'path'." |
| paul@131 | 355 | |
| paul@131 | 356 | return "#%s" % path |
| paul@131 | 357 | |
| paul@56 | 358 | |
| paul@56 | 359 | |
| paul@0 | 360 | # Output language reserved words. |
| paul@0 | 361 | |
| paul@0 | 362 | reserved_words = [ |
| paul@0 | 363 | "break", "char", "const", "continue", |
| paul@0 | 364 | "default", "double", "else", |
| paul@0 | 365 | "float", "for", |
| paul@0 | 366 | "if", "int", "long", |
| paul@0 | 367 | "NULL", |
| paul@0 | 368 | "return", "struct", |
| paul@0 | 369 | "typedef", |
| paul@0 | 370 | "void", "while", |
| paul@0 | 371 | ] |
| paul@0 | 372 | |
| paul@0 | 373 | # vim: tabstop=4 expandtab shiftwidth=4 |
