Even if we `goto` another routine, we can't trash an output.
Chris Pressey
7 years ago
| 6 | 6 | * `copy` is now understood to trash `a`, thus `copy ..., a` is not valid. |
| 7 | 7 | Indirect addressing is supported in `ld`, as in `ld a, [ptr] + y`, to compensate. |
| 8 | 8 | * Implements the "union rule for trashes" when analyzing `if` blocks. |
| 9 | * Even if we `goto` another routine, we can't trash an output. | |
| 9 | 10 | * Fixed bug where `trash` was not marking the location as being virtually altered. |
| 10 | 11 | |
| 11 | 12 | 0.11 |
| 34 | 34 | actor_pos, actor_delta, actor_logic, |
| 35 | 35 | screen, screen1, screen2, screen3, screen4, colormap1, colormap2, colormap3, colormap4 |
| 36 | 36 | outputs button_down, dispatch_game_state, |
| 37 | actor_pos, pos, new_pos, actor_delta, delta, actor_logic, | |
| 37 | actor_pos, actor_delta, actor_logic, | |
| 38 | 38 | screen, screen1, screen2, screen3, screen4, colormap1, colormap2, colormap3, colormap4 |
| 39 | trashes a, x, y, c, z, n, v, ptr, save_x, compare_target, dispatch_logic | |
| 39 | trashes a, x, y, c, z, n, v, pos, new_pos, delta, ptr, save_x, compare_target, dispatch_logic | |
| 40 | 40 | game_state_routine |
| 41 | 41 | |
| 42 | 42 | // |
| 401 | 401 | |
| 402 | 402 | if c { |
| 403 | 403 | call clear_screen |
| 404 | ||
| 405 | // FIXME: this seems wrong and we need to investigate it. | |
| 406 | // init_game trashes `pos` (this is reasonable.) But pos is declared | |
| 407 | // as an output to `game_state_routine`. This should be an error... | |
| 408 | 404 | call init_game |
| 409 | ||
| 410 | 405 | copy forward game_state_play, dispatch_game_state |
| 411 | 406 | } |
| 412 | 407 | |
| 201 | 201 | return |
| 202 | 202 | type_ = routine.location.type |
| 203 | 203 | context = Context(self.routines, routine, type_.inputs, type_.outputs, type_.trashes) |
| 204 | ||
| 204 | 205 | if self.debug: |
| 205 | 206 | print "at start of routine `{}`:".format(routine.name) |
| 206 | 207 | print context |
| 208 | ||
| 207 | 209 | self.analyze_block(routine.block, context) |
| 210 | trashed = set(context.each_touched()) - context._meaningful | |
| 211 | ||
| 208 | 212 | if self.debug: |
| 209 | 213 | print "at end of routine `{}`:".format(routine.name) |
| 210 | 214 | print context |
| 215 | print "trashed: ", LocationRef.format_set(trashed) | |
| 216 | print "outputs: ", LocationRef.format_set(type_.outputs) | |
| 217 | trashed_outputs = type_.outputs & trashed | |
| 218 | if trashed_outputs: | |
| 219 | print "TRASHED OUTPUTS: ", LocationRef.format_set(trashed_outputs) | |
| 220 | print '' | |
| 221 | print '-' * 79 | |
| 222 | print '' | |
| 223 | ||
| 224 | # even if we goto another routine, we can't trash an output. | |
| 225 | for ref in trashed: | |
| 226 | if ref in type_.outputs: | |
| 227 | raise UnmeaningfulOutputError('%s in %s' % (ref.name, routine.name)) | |
| 228 | ||
| 211 | 229 | if not self.has_encountered_goto: |
| 212 | 230 | for ref in type_.outputs: |
| 213 | 231 | context.assert_meaningful(ref, exception_class=UnmeaningfulOutputError) |