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gh-114058: Foundations of the Tier2 redundancy eliminator (GH-115085)

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---------

Co-authored-by: Mark Shannon <9448417+markshannon@users.noreply.github.com>
Co-authored-by: Jules <57632293+JuliaPoo@users.noreply.github.com>
Co-authored-by: Guido van Rossum <gvanrossum@users.noreply.github.com>
This commit is contained in:
Ken Jin 2024-02-13 21:24:48 +08:00 • committed by GitHub
parent ccc76c3e88
commit 7cce857622
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25 changed files with 3137 additions and 140 deletions
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26
Tools/cases_generator/parsing.py
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@ -75,11 +75,6 @@ class StackEffect(Node):
size: str = "" # Optional `[size]`
# Note: size cannot be combined with type or cond
# Optional `(type, refinement)`
type_prop: None | tuple[str, None | str] = field(
default_factory=lambda: None, init=True, compare=False, hash=False
)
def __repr__(self) -> str:
items = [self.name, self.type, self.cond, self.size]
while items and items[-1] == "":
@ -260,25 +255,14 @@ class Parser(PLexer):
@contextual
def stack_effect(self) -> StackEffect | None:
# IDENTIFIER [':' [IDENTIFIER [TIMES]] ['&' '(' IDENTIFIER ['+' IDENTIFIER] ')']] ['if' '(' expression ')']
# IDENTIFIER [':' IDENTIFIER [TIMES]] ['if' '(' expression ')']
# | IDENTIFIER '[' expression ']'
if tkn := self.expect(lx.IDENTIFIER):
type_text = ""
type_prop = None
if self.expect(lx.COLON):
if i := self.expect(lx.IDENTIFIER):
type_text = i.text.strip()
if self.expect(lx.TIMES):
type_text += " *"
if self.expect(lx.AND):
consumed_bracket = self.expect(lx.LPAREN) is not None
type_prop_text = self.require(lx.IDENTIFIER).text.strip()
refinement = None
if self.expect(lx.PLUS):
refinement = self.require(lx.IDENTIFIER).text.strip()
type_prop = (type_prop_text, refinement)
if consumed_bracket:
self.require(lx.RPAREN)
type_text = self.require(lx.IDENTIFIER).text.strip()
if self.expect(lx.TIMES):
type_text += " *"
cond_text = ""
if self.expect(lx.IF):
self.require(lx.LPAREN)
@ -295,7 +279,7 @@ class Parser(PLexer):
self.require(lx.RBRACKET)
type_text = "PyObject **"
size_text = size.text.strip()
return StackEffect(tkn.text, type_text, cond_text, size_text, type_prop)
return StackEffect(tkn.text, type_text, cond_text, size_text)
return None
@contextual