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66 lines
2.6 KiB
Python
66 lines
2.6 KiB
Python
# Copyright (c) 2020, 2022 Rocky Bernstein
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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def iflaststmt(
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self, lhs: str, n: int, rule, tree, tokens: list, first: int, last: int
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) -> bool:
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testexpr = tree[0]
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# print("XXX", first, last, rule)
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# for t in range(first, last): print(tokens[t])
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# print("="*40)
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if testexpr[0] in ("testtrue", "testfalse"):
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test = testexpr[0]
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if len(test) > 1 and test[1].kind.startswith("jmp_"):
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if last == n:
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last -= 1
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jmp_target = test[1][0].attr
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if tokens[first].off2int() <= jmp_target < tokens[last].off2int():
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return True
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# jmp_target less than tokens[first] is okay - is to a loop
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# jmp_target equal tokens[last] is also okay: normal non-optimized non-loop jump
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if (
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(last + 1) < n
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and tokens[last - 1] != "JUMP_BACK"
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and tokens[last + 1] == "COME_FROM_LOOP"
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):
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# iflastsmtl is not at the end of a loop, but jumped outside of loop. No good.
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# FIXME: check that tokens[last] == "POP_BLOCK"? Or allow for it not to appear?
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return True
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# If the instruction before "first" is a "POP_JUMP_IF_FALSE" which goes
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# to the same target as jmp_target, then this not nested "if .. if .."
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# but rather "if ... and ..."
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if first > 0 and tokens[first - 1] == "POP_JUMP_IF_FALSE":
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return tokens[first - 1].attr == jmp_target
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if jmp_target > tokens[last].off2int():
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# One more weird case to look out for
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# if c1:
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# if c2: # Jumps around the *outer* "else"
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# ...
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# else:
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if jmp_target == tokens[last - 1].attr:
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return False
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if last < n and tokens[last].kind.startswith("JUMP"):
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return False
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return True
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pass
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return False
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