8000 GH-131729: Code-gen better liveness analysis by markshannon · Pull Request #131732 · python/cpython · GitHub
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GH-131729: Code-gen better liveness analysis #131732

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Merged
merged 12 commits into from
Mar 26, 2025
Merged

GH-131729: Code-gen better liveness analysis #131732

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45199ae
Remove redundant attribute
markshannon Mar 24, 2025
d786146
Rename 'defined' attribute to 'in_local' to more accurately reflect h…
markshannon Mar 24, 2025
2b21bf9
Remove unused function
markshannon Mar 24, 2025
66f5826
Make death of variables explicit even for array variables.
markshannon Mar 24, 2025
5d6a9f8
Remove used 'peeks' attribute
markshannon Mar 24, 2025
6e2a189
Convert in_memory from boolean to stack offset
markshannon Mar 24, 2025
417c96d
Don't apply liveness analyis to optimizer generated code
markshannon Mar 25, 2025
05a4daa
Fix RETURN_VALUE in optimizer
markshannon Mar 25, 2025
b8c3a9e
Fix up type annotations
markshannon Mar 25, 2025
d81c7de
Fixup NULLing out array items during DECREF_INPUTS
markshannon Mar 26, 2025
af5f616
Cleanup errors
markshannon Mar 26, 2025
9238a67
Update test output to reflect fix
markshannon Mar 26, 2025
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Remove redundant attribute
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@markshannon
markshannon committed Mar 24, 2025
commit 45199ae8c0b6118f89319d8d183df1e581eb2a4c
11 changes: 4 additions & 7 deletions Tools/cases_generator/stack.py
8000
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,6 @@ def var_size(var: StackItem) -> str:
@dataclass
class Local:
item: StackItem
cached: bool
in_memory: bool
defined: bool

Expand All @@ -47,21 +46,21 @@ def compact_str(self) -> str:

@staticmethod
def unused(defn: StackItem) -> "Local":
return Local(defn, False, defn.is_array(), False)
return Local(defn, defn.is_array(), False)

@staticmethod
def undefined(defn: StackItem) -> "Local":
array = defn.is_array()
return Local(defn, not array, array, False)
return Local(defn, array, False)

@staticmethod
def redefinition(var: StackItem, prev: "Local") -> "Local":
assert var.is_array() == prev.is_array()
return Local(var, prev.cached, prev.in_memory, True)
return Local(var, prev.in_memory, True)

@staticmethod
def from_memory(defn: StackItem) -> "Local":
return Local(defn, True, True, True)
return Local(defn, True, True)

def kill(self) -> None:
self.defined = False
Expand All @@ -70,7 +69,6 @@ def kill(self) -> None:
def copy(self) -> "Local":
return Local(
self.item,
self.cached,
self.in_memory,
self.defined
)
Expand All @@ -91,7 +89,6 @@ def __eq__(self, other: object) -> bool:
return NotImplemented
return (
self.item is other.item
and self.cached is other.cached
and self.in_memory is other.in_memory
and self.defined is other.defined
)
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