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bpo-43846: Use less stack for large literals and calls #25403

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Merged
markshannon merged 6 commits into from
Apr 15, 2021
Merged

bpo-43846: Use less stack for large literals and calls #25403

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67c7d87
Modify compiler to reduce stack consumption for large expressions.
markshannon Apr 14, 2021
a5afaad
Add more tests for stack usage.
markshannon Apr 14, 2021
8c3cc5c
Add NEWS item.
markshannon Apr 14, 2021
87b7b6d
Remove assertion and raise SystemError for truly excessive stack use.
markshannon Apr 14, 2021
a523a6e
Clarify comments for STACK_USE_GUIDELINE and MAX_ALLOWED_STACK_USE.
markshannon Apr 14, 2021
95feeb8
Clean up starunpack_helper. Make sure all tests against STACK_USE_GUI…
markshannon Apr 15, 2021
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Add more tests for stack usage.
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@markshannon
markshannon committed Apr 14, 2021
commit a5afaad0785ad3e42dc3b3c21b69f7299f9d3988
26 changes: 26 additions & 0 deletions Lib/test/test_compile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -961,6 +961,32 @@ def test_if_else(self):
def test_binop(self):
self.check_stack_size("x + " * self.N + "x")

def test_list(self):
self.check_stack_size("[" + "x, " * self.N + "x]")

def test_tuple(self):
self.check_stack_size("(" + "x, " * self.N + "x)")

def test_set(self):
self.check_stack_size("{" + "x, " * self.N + "x}")

def test_dict(self):
self.check_stack_size("{" + "x:x, " * self.N + "x:x}")

def test_func_args(self):
self.check_stack_size("f(" + "x, " * self.N + ")")

def test_func_kwargs(self):
kwargs = (f'a{i}=x' for i in range(self.N))
self.check_stack_size("f(" + ", ".join(kwargs) + ")")

def test_func_args(self):
self.check_stack_size("o.m(" + "x, " * self.N + ")")

def test_meth_kwargs(self):
kwargs = (f'a{i}=x' for i in range(self.N))
self.check_stack_size("o.m(" + ", ".join(kwargs) + ")")

def test_func_and(self):
code = "def f(x):\n"
code += " x and x\n" * self.N
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