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_string_literal_expression(counters, expression):
 101     referenced_entry_list = ()
 102     instruction_list = (CIRInstruction(
 103         instruction='push_value',
 104         argument=generate_string_literal(expression.string),
 105     ),)
 106
 107     return referenced_entry_list, instruction_list
 108
 109 def generate_symbol_expression(counters, expression):
 110     referenced_entry_list = ()
 111     instruction_list = (CIRInstruction(
 112         instruction='push',
 113         argument=generate_symbol_literal(expression.symbol),
 114     ),)
 115
 116     return referenced_entry_list, instruction_list
 117
 118 def generate_variable_expression(counters, expression):
 119     referenced_entry_list = ()
 120     instruction_list = (CIRInstruction(
 121         instruction='push',
 122         argument=generate_symbol_literal(expression.variable),
 123     ),)
 124
 125     return referenced_entry_list, instruction_list
 126
 127 def generate_expression(counters, expression):
 128     return {
 129         conversion.CPSFunctionCallExpression: generate_function_call_expression,
 130         conversion.CPSIfElseExpression: generate_if_else_expression,
 131         conversion.CPSIntegerLiteralExpression: generate_integer_literal_expression,
 132         conversion.CPSLambdaExpression: generate_lambda_expression,
 133         conversion.CPSStringLiteralExpression: generate_string_literal_expression,
 134         conversion.CPSSymbolExpression: generate_symbol_expression,
 135         conversion.CPSVariableExpression: generate_variable_expression,
 136     }[type(expression)](counters, expression)
 137
 138 def generate_expression_statement(counters, statement):
 139     referenced_entry_list, instruction_list = generate_expression(
 140         counters,
 141         statement.expression,
 142     )
 143
 144     instruction_list += (
 145         CIRInstruction(
 146             instruction='drop',
 147             argument=None,
 148         ),
 149     )
 150
 151     return referenced_entry_list, instruction_list
 152
 153 def generate_if_else_expression(counters, statement):
 154     if_counter = counters['if']
 155     counters['if'] += 1
 156
 157     referenced_entry_list_list = []
 158
 159     condition_referenced_entry_list, condition_instruction_list = generate_expression(
 160         counters,
 161         statement.condition_expression,
 162     )
 163
 164     if_instruction_list_list = []
 165     for if_statement in statement.if_statement_list:
 166         referenced_entry_list, instruction_list = generate_statement(counters, if_statement)
 167         referenced_entry_list_list.append(referenced_entry_list)
 168         if_instruction_list_list.append(instruction_list)
 169
 170     if_instruction_list = flatten(if_instruction_list_list)
 171     assert if_instruction_list[-1].instruction == 'drop'
 172     if_instruction_list = if_instruction_list[:-1]
 173
 174     else_instruction_list_list = []
 175
 176     for else_statement in statement.else_statement_list:
 177         referenced_entry_list, instruction_list = generate_statement(counters, else_statement)
 178         referenced_entry_list_list.append(referenced_entry_list)
 179         else_instruction_list_list.append(instruction_list)
 180
 181     else_instruction_list = flatten(else_instruction_list_list)
 182     assert else_instruction_list[-1].instruction == 'drop'
 183     else_instruction_list = else_instruction_list[:-1]
 184
 185     if_label = '__if${}__'.format(if_counter)
 186     else_label = '__else${}__'.format(if_counter)
 187     endif_label = '__endif${}__'.format(if_counter)
 188
 189     instruction_list = condition_instruction_list + (
 190         CIRInstruction(
 191             instruction='jump_if_false',
 192             argument=else_label,
 193         ),
 194         CIRInstruction(
 195             instruction='jump',
 196             argument=if_label,
 197         ),
 198         CIRLabel(label=if_label),
 199     ) + if_instruction_list + (
 200         CIRInstruction(
 201             instruction='jump',
 202             argument=endif_label,
 203         ),
 204         CIRLabel(label=else_label),
 205     ) + else_instruction_list + (
 206         CIRLabel(label=endif_label),
 207     )
 208
 209     return (
 210         condition_referenced_entry_list + flatten(referenced_entry_list_list),
 211         instruction_list,
 212     )
 213
 214 def generate_assignment_statement(counters, statement):
 215     referenced_entry_list, instruction_list = generate_expression(
 216         counters,
 217         statement.expression,
 218     )
 219
 220     instruction_list += (
 221         CIRInstruction(
 222             instruction='pop',
 223             argument=generate_symbol_literal(statement.target),
 224         ),
 225     )
 226
 227     return referenced_entry_list, instruction_list
 228
 229 def generate_push_statement(counters, statement):
 230     return generate_expression(counters, statement.expression)
 231
 232 def generate_variable_initialization_statement(counters, statement):
 233     referenced_entry_list, instruction_list = generate_expression(
 234         counters,
 235         statement.expression,
 236     )
 237
 238     instruction_list += (
 239         CIRInstruction(
 240             instruction='pop',
 241             argument=generate_symbol_literal(statement.variable),
 242         ),
 243     )
 244
 245     return referenced_entry_list, instruction_list
 246
 247 def generate_statement(counters, statement):
 248     return {
 249         conversion.CPSAssignmentStatement: generate_assignment_statement,
 250         conversion.CPSExpressionStatement: generate_expression_statement,
 251         conversion.CPSPushStatement: generate_push_statement,
 252         conversion.CPSVariableInitializationStatement: generate_variable_initialization_statement,
 253     }[type(statement)](counters, statement)
 254
 255 def generate(converted):
 256     referenced_entry_list_list = []
 257     instruction_list_list = []
 258     counters = {
 259         'if': 0,
 260     }
 261
 262     for statement in converted.statement_list:
 263         referenced_entry_list, instruction_list = generate_statement(counters, statement)
 264         referenced_entry_list_list.append(referenced_entry_list)
 265         instruction_list_list.append(instruction_list)
 266
 267     return CIRProgram(
 268         entry_list=flatten(referenced_entry_list_list) + (
 269             CIRLabel(label='__main__'),
 270         ) + flatten(instruction_list_list),
 271     )
 272
 273 NO_ARGUMENT_INSTRUCTIONS = set([
 274     'drop',
 275     'return',
 276 ])
 277
 278 def format_argument(arg):
 279     if arg is None:
 280         return 'nil'
 281     return arg
 282
 283 def output(program):
 284     lines = []
 285
 286     for entry in program.entry_list:
 287         if isinstance(entry, CIRInstruction):
 288             if entry.instruction in NO_ARGUMENT_INSTRUCTIONS and entry.argument is None:
 289                 lines.append('    {}'.format(entry.instruction))
 290             else:
 291                 lines.append('    {} {}'.format(entry.instruction, format_argument(entry.argument)))
 292
 293         if isinstance(entry, CIRLabel):
 294             lines.append('\n{}:'.format(entry.label))
 295
 296     return '\n'.join(lines).lstrip()