code.kerkeslager.com Git - fur/blob - crossplatform_ir_generation.py

   1 import collections
   2
   3 import conversion
   4
   5 def flatten(xses):
   6     return tuple(x for xs in xses for x in xs)
   7
   8 CIRProgram = collections.namedtuple(
   9     'CIRProgram',
  10     (
  11         'entry_list',
  12     ),
  13 )
  14
  15 CIRLabel = collections.namedtuple(
  16     'CIRLabel',
  17     (
  18         'label',
  19     ),
  20 )
  21
  22 CIRInstruction = collections.namedtuple(
  23     'CIRInstruction',
  24     (
  25         'instruction',
  26         'argument',
  27     ),
  28 )
  29
  30 def generate_integer_literal(integer):
  31     return integer
  32
  33 def generate_string_literal(string):
  34     return '"{}"'.format(string)
  35
  36 def generate_symbol_literal(symbol):
  37     return 'sym({})'.format(symbol)
  38
  39 def generate_function_call_expression(counters, expression):
  40     referenced_entry_list, instruction_list = generate_expression(
  41         counters,
  42         expression.function_expression,
  43     )
  44
  45     instruction_list += (
  46         CIRInstruction(
  47             instruction='call',
  48             argument=expression.argument_count,
  49         ),
  50     )
  51
  52     return referenced_entry_list, instruction_list
  53
  54 def generate_integer_literal_expression(counters, expression):
  55     referenced_entry_list = ()
  56     instruction_list = (CIRInstruction(
  57         instruction='push_value',
  58         argument=generate_integer_literal(expression.integer),
  59     ),)
  60
  61     return referenced_entry_list, instruction_list
  62
  63 def generate_lambda_expression(counters, expression):
  64     if expression.name is None or 'lambda' in expression.name.lower():
  65         import ipdb; ipdb.set_trace()
  66
  67     name_counter = counters.get(expression.name, 0)
  68     counters[expression.name] = name_counter + 1
  69     label = '{}${}'.format(expression.name, name_counter)
  70
  71     referenced_entry_list_list = []
  72     instruction_list_list = []
  73
  74     for statement in expression.statement_list:
  75         referenced_entry_list, instruction_list = generate_statement(counters, statement)
  76         referenced_entry_list_list.append(referenced_entry_list)
  77         instruction_list_list.append(instruction_list)
  78
  79     # Pop from the stack in reversed order, because arguments were pushed onto
  80     # the stack in order
  81     argument_bindings = tuple(
  82         CIRInstruction(instruction='pop', argument='sym({})'.format(arg))
  83         for arg in reversed(expression.argument_name_list)
  84     )
  85
  86     lambda_body = flatten(instruction_list_list)
  87     assert lambda_body[-1].instruction == 'drop'
  88     lambda_body = argument_bindings + lambda_body[:-1] + (CIRInstruction(instruction='return', argument=None),)
  89
  90     referenced_entry_list_list.append(
  91         (CIRLabel(label=label),) + lambda_body,
  92     )
  93
  94     instruction_list = (
  95         CIRInstruction(instruction='close', argument=label),
  96     )
  97
  98     return flatten(referenced_entry_list_list), instruction_list
  99
 100 def generate_list_construct_expression(counters, expression):
 101     referenced_entry_list = ()
 102     instruction_list = (CIRInstruction(
 103         instruction='list',
 104         argument=2,
 105     ),)
 106     return referenced_entry_list, instruction_list
 107
 108 def generate_string_literal_expression(counters, expression):
 109     referenced_entry_list = ()
 110     instruction_list = (CIRInstruction(
 111         instruction='push_value',
 112         argument=generate_string_literal(expression.string),
 113     ),)
 114
 115     return referenced_entry_list, instruction_list
 116
 117 def generate_symbol_expression(counters, expression):
 118     referenced_entry_list = ()
 119     instruction_list = (CIRInstruction(
 120         instruction='push',
 121         argument=generate_symbol_literal(expression.symbol),
 122     ),)
 123
 124     return referenced_entry_list, instruction_list
 125
 126 def generate_variable_expression(counters, expression):
 127     referenced_entry_list = ()
 128     instruction_list = (CIRInstruction(
 129         instruction='push',
 130         argument=generate_symbol_literal(expression.variable),
 131     ),)
 132
 133     return referenced_entry_list, instruction_list
 134
 135 def generate_expression(counters, expression):
 136     return {
 137         conversion.CPSFunctionCallExpression: generate_function_call_expression,
 138         conversion.CPSIfElseExpression: generate_if_else_expression,
 139         conversion.CPSIntegerLiteralExpression: generate_integer_literal_expression,
 140         conversion.CPSLambdaExpression: generate_lambda_expression,
 141         conversion.CPSListConstructExpression: generate_list_construct_expression,
 142         conversion.CPSStringLiteralExpression: generate_string_literal_expression,
 143         conversion.CPSSymbolExpression: generate_symbol_expression,
 144         conversion.CPSVariableExpression: generate_variable_expression,
 145     }[type(expression)](counters, expression)
 146
 147 def generate_expression_statement(counters, statement):
 148     referenced_entry_list, instruction_list = generate_expression(
 149         counters,
 150         statement.expression,
 151     )
 152
 153     instruction_list += (
 154         CIRInstruction(
 155             instruction='drop',
 156             argument=None,
 157         ),
 158     )
 159
 160     return referenced_entry_list, instruction_list
 161
 162 def generate_if_else_expression(counters, statement):
 163     if_counter = counters['if']
 164     counters['if'] += 1
 165
 166     referenced_entry_list_list = []
 167
 168     condition_referenced_entry_list, condition_instruction_list = generate_expression(
 169         counters,
 170         statement.condition_expression,
 171     )
 172
 173     if_instruction_list_list = []
 174     for if_statement in statement.if_statement_list:
 175         referenced_entry_list, instruction_list = generate_statement(counters, if_statement)
 176         referenced_entry_list_list.append(referenced_entry_list)
 177         if_instruction_list_list.append(instruction_list)
 178
 179     if_instruction_list = flatten(if_instruction_list_list)
 180     assert if_instruction_list[-1].instruction == 'drop'
 181     if_instruction_list = if_instruction_list[:-1]
 182
 183     else_instruction_list_list = []
 184
 185     for else_statement in statement.else_statement_list:
 186         referenced_entry_list, instruction_list = generate_statement(counters, else_statement)
 187         referenced_entry_list_list.append(referenced_entry_list)
 188         else_instruction_list_list.append(instruction_list)
 189
 190     else_instruction_list = flatten(else_instruction_list_list)
 191     assert else_instruction_list[-1].instruction == 'drop'
 192     else_instruction_list = else_instruction_list[:-1]
 193
 194     if_label = '__if${}__'.format(if_counter)
 195     else_label = '__else${}__'.format(if_counter)
 196     endif_label = '__endif${}__'.format(if_counter)
 197
 198     instruction_list = condition_instruction_list + (
 199         CIRInstruction(
 200             instruction='jump_if_false',
 201             argument=else_label,
 202         ),
 203         CIRInstruction(
 204             instruction='jump',
 205             argument=if_label,
 206         ),
 207         CIRLabel(label=if_label),
 208     ) + if_instruction_list + (
 209         CIRInstruction(
 210             instruction='jump',
 211             argument=endif_label,
 212         ),
 213         CIRLabel(label=else_label),
 214     ) + else_instruction_list + (
 215         CIRLabel(label=endif_label),
 216     )
 217
 218     return (
 219         condition_referenced_entry_list + flatten(referenced_entry_list_list),
 220         instruction_list,
 221     )
 222
 223 def generate_assignment_statement(counters, statement):
 224     referenced_entry_list, instruction_list = generate_expression(
 225         counters,
 226         statement.expression,
 227     )
 228
 229     instruction_list += (
 230         CIRInstruction(
 231             instruction='pop',
 232             argument=generate_symbol_literal(statement.target),
 233         ),
 234     )
 235
 236     return referenced_entry_list, instruction_list
 237
 238 def generate_push_statement(counters, statement):
 239     return generate_expression(counters, statement.expression)
 240
 241 def generate_variable_initialization_statement(counters, statement):
 242     referenced_entry_list, instruction_list = generate_expression(
 243         counters,
 244         statement.expression,
 245     )
 246
 247     instruction_list += (
 248         CIRInstruction(
 249             instruction='pop',
 250             argument=generate_symbol_literal(statement.variable),
 251         ),
 252     )
 253
 254     return referenced_entry_list, instruction_list
 255
 256 def generate_statement(counters, statement):
 257     return {
 258         conversion.CPSAssignmentStatement: generate_assignment_statement,
 259         conversion.CPSExpressionStatement: generate_expression_statement,
 260         conversion.CPSPushStatement: generate_push_statement,
 261         conversion.CPSVariableInitializationStatement: generate_variable_initialization_statement,
 262     }[type(statement)](counters, statement)
 263
 264 def generate(converted):
 265     referenced_entry_list_list = []
 266     instruction_list_list = []
 267     counters = {
 268         'if': 0,
 269     }
 270
 271     for statement in converted.statement_list:
 272         referenced_entry_list, instruction_list = generate_statement(counters, statement)
 273         referenced_entry_list_list.append(referenced_entry_list)
 274         instruction_list_list.append(instruction_list)
 275
 276     return CIRProgram(
 277         entry_list=flatten(referenced_entry_list_list) + (
 278             CIRLabel(label='__main__'),
 279         ) + flatten(instruction_list_list),
 280     )
 281
 282 NO_ARGUMENT_INSTRUCTIONS = set([
 283     'drop',
 284     'return',
 285 ])
 286
 287 def format_argument(arg):
 288     if arg is None:
 289         return 'nil'
 290     return arg
 291
 292 def output(program):
 293     lines = []
 294
 295     for entry in program.entry_list:
 296         if isinstance(entry, CIRInstruction):
 297             if entry.instruction in NO_ARGUMENT_INSTRUCTIONS and entry.argument is None:
 298                 lines.append('    {}'.format(entry.instruction))
 299             else:
 300                 lines.append('    {} {}'.format(entry.instruction, format_argument(entry.argument)))
 301
 302         if isinstance(entry, CIRLabel):
 303             lines.append('\n{}:'.format(entry.label))
 304
 305     return '\n'.join(lines).lstrip()