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     for argument_name in expression.argument_name_list:
  72         import ipdb; ipdb.set_trace()
  73
  74     referenced_entry_list_list = []
  75     instruction_list_list = []
  76
  77     for statement in expression.statement_list:
  78         referenced_entry_list, instruction_list = generate_statement(counters, statement)
  79         referenced_entry_list_list.append(referenced_entry_list)
  80         instruction_list_list.append(instruction_list)
  81
  82     lambda_body = flatten(instruction_list_list)
  83     assert lambda_body[-1].instruction == 'drop'
  84     lambda_body = lambda_body[:-1] + (CIRInstruction(instruction='return', argument=None),)
  85
  86     referenced_entry_list_list.append(
  87         (CIRLabel(label=label),) + lambda_body,
  88     )
  89
  90     instruction_list = (
  91         CIRInstruction(instruction='close', argument=label),
  92     )
  93
  94     return flatten(referenced_entry_list_list), instruction_list
  95
  96 def generate_string_literal_expression(counters, expression):
  97     referenced_entry_list = ()
  98     instruction_list = (CIRInstruction(
  99         instruction='push_value',
 100         argument=generate_string_literal(expression.string),
 101     ),)
 102
 103     return referenced_entry_list, instruction_list
 104
 105 def generate_symbol_expression(counters, expression):
 106     referenced_entry_list = ()
 107     instruction_list = (CIRInstruction(
 108         instruction='push',
 109         argument=generate_symbol_literal(expression.symbol),
 110     ),)
 111
 112     return referenced_entry_list, instruction_list
 113
 114 def generate_variable_expression(counters, expression):
 115     referenced_entry_list = ()
 116     instruction_list = (CIRInstruction(
 117         instruction='push',
 118         argument=generate_symbol_literal(expression.variable),
 119     ),)
 120
 121     return referenced_entry_list, instruction_list
 122
 123 def generate_expression(counters, expression):
 124     return {
 125         conversion.CPSFunctionCallExpression: generate_function_call_expression,
 126         conversion.CPSIntegerLiteralExpression: generate_integer_literal_expression,
 127         conversion.CPSLambdaExpression: generate_lambda_expression,
 128         conversion.CPSStringLiteralExpression: generate_string_literal_expression,
 129         conversion.CPSSymbolExpression: generate_symbol_expression,
 130         conversion.CPSVariableExpression: generate_variable_expression,
 131     }[type(expression)](counters, expression)
 132
 133 def generate_expression_statement(counters, statement):
 134     referenced_entry_list, instruction_list = generate_expression(
 135         counters,
 136         statement.expression,
 137     )
 138
 139     instruction_list += (
 140         CIRInstruction(
 141             instruction='drop',
 142             argument=None,
 143         ),
 144     )
 145
 146     return referenced_entry_list, instruction_list
 147
 148 def generate_if_else_statement(counters, statement):
 149     if_counter = counters['if']
 150     counters['if'] += 1
 151
 152     referenced_entry_list_list = []
 153
 154     if_instruction_list_list = []
 155     for if_statement in statement.if_statement_list:
 156         referenced_entry_list, instruction_list = generate_statement(counters, if_statement)
 157         referenced_entry_list_list.append(referenced_entry_list)
 158         if_instruction_list_list.append(instruction_list)
 159
 160     else_instruction_list_list = []
 161
 162     for else_statement in statement.else_statement_list:
 163         referenced_entry_list, instruction_list = generate_statement(counters, else_statement)
 164         referenced_entry_list_list.append(referenced_entry_list)
 165         else_instruction_list_list.append(instruction_list)
 166
 167     if_label = '__if${}__'.format(if_counter)
 168     else_label = '__else${}__'.format(if_counter)
 169     endif_label = '__endif${}__'.format(if_counter)
 170
 171     instruction_list = (
 172         referenced_entry_list_list,
 173         generate_expression(counters, statement.condition_expression) + (
 174             CIRInstruction(
 175                 instruction='jump_if_false',
 176                 argument=else_label,
 177             ),
 178             CIRLabel(label=if_label),
 179         ) + flatten(if_instruction_list_list) + (
 180             CIRInstruction(
 181                 instruction='jump',
 182                 argument=endif_label,
 183             ),
 184             CIRLabel(label=else_label),
 185         ) + flatten(else_instruction_list_list) + (
 186             CIRLabel(label=endif_label),
 187         ),
 188     )
 189
 190     return flatten(referenced_entry_list_list), instruction_list
 191
 192 def generate_assignment_statement(counters, statement):
 193     referenced_entry_list, instruction_list = generate_expression(
 194         counters,
 195         statement.expression,
 196     )
 197
 198     instruction_list += (
 199         CIRInstruction(
 200             instruction='pop',
 201             argument=generate_symbol_literal(statement.target),
 202         ),
 203     )
 204
 205     return referenced_entry_list, instruction_list
 206
 207 def generate_push_statement(counters, statement):
 208     return generate_expression(counters, statement.expression)
 209
 210 def generate_variable_initialization_statement(counters, statement):
 211     referenced_entry_list, instruction_list = generate_expression(
 212         counters,
 213         statement.expression,
 214     )
 215
 216     instruction_list += (
 217         CIRInstruction(
 218             instruction='pop',
 219             argument=generate_symbol_literal(statement.variable),
 220         ),
 221     )
 222
 223     return referenced_entry_list, instruction_list
 224
 225 def generate_variable_reassignment_statement(counters, statement):
 226     referenced_entry_list, instruction_list = generate_expression(
 227         counters,
 228         statement.expression,
 229     )
 230
 231     instruction_list += (
 232         CIRInstruction(
 233             instruction='pop',
 234             argument=generate_symbol_literal(statement.variable),
 235         ),
 236     )
 237
 238     return referenced_entry_list, instruction_list
 239
 240 def generate_statement(counters, statement):
 241     return {
 242         conversion.CPSAssignmentStatement: generate_assignment_statement,
 243         conversion.CPSExpressionStatement: generate_expression_statement,
 244         conversion.CPSIfElseStatement: generate_if_else_statement,
 245         conversion.CPSPushStatement: generate_push_statement,
 246         conversion.CPSVariableInitializationStatement: generate_variable_initialization_statement,
 247         conversion.CPSVariableReassignmentStatement: generate_variable_reassignment_statement,
 248     }[type(statement)](counters, statement)
 249
 250 def generate(converted):
 251     referenced_entry_list_list = []
 252     instruction_list_list = []
 253     counters = {
 254         'if': 0,
 255     }
 256
 257     for statement in converted.statement_list:
 258         referenced_entry_list, instruction_list = generate_statement(counters, statement)
 259         referenced_entry_list_list.append(referenced_entry_list)
 260         instruction_list_list.append(instruction_list)
 261
 262     return CIRProgram(
 263         entry_list=flatten(referenced_entry_list_list) + (
 264             CIRLabel(label='__main__'),
 265         ) + flatten(instruction_list_list),
 266     )
 267
 268 NO_ARGUMENT_INSTRUCTIONS = set([
 269     'drop',
 270     'return',
 271 ])
 272
 273 def format_argument(arg):
 274     if arg is None:
 275         return 'nil'
 276     return arg
 277
 278 def output(program):
 279     lines = []
 280
 281     for entry in program.entry_list:
 282         if isinstance(entry, CIRInstruction):
 283             if entry.instruction in NO_ARGUMENT_INSTRUCTIONS and entry.argument is None:
 284                 lines.append('    {}'.format(entry.instruction))
 285             else:
 286                 lines.append('    {} {}'.format(entry.instruction, format_argument(entry.argument)))
 287
 288         if isinstance(entry, CIRLabel):
 289             lines.append('\n{}:'.format(entry.label))
 290
 291     return '\n'.join(lines).lstrip()