llvm/mlir/test/python/ir/context_lifecycle.py

# RUN: %PYTHON %s
# Standalone sanity check of context life-cycle.
import gc
import mlir.ir

assert mlir.ir.Context._get_live_count() == 0

# Create first context.
print("CREATE C1")
c1 = mlir.ir.Context()
assert mlir.ir.Context._get_live_count() == 1
c1_repr = repr(c1)
print("C1 = ", c1_repr)

print("GETTING AGAIN...")
c2 = c1._get_context_again()
c2_repr = repr(c2)
assert mlir.ir.Context._get_live_count() == 1
assert c1_repr == c2_repr

print("C2 =", c2)

# Make sure new contexts on constructor.
print("CREATE C3")
c3 = mlir.ir.Context()
assert mlir.ir.Context._get_live_count() == 2
c3_repr = repr(c3)
print("C3 =", c3)
assert c3_repr != c1_repr
print("FREE C3")
c3 = None
gc.collect()
assert mlir.ir.Context._get_live_count() == 1

print("Free C1")
c1 = None
gc.collect()
assert mlir.ir.Context._get_live_count() == 1
print("Free C2")
c2 = None
gc.collect()
assert mlir.ir.Context._get_live_count() == 0

# Create a context, get its capsule and create from capsule.
c4 = mlir.ir.Context()
c4_capsule = c4._CAPIPtr
assert '"mlir.ir.Context._CAPIPtr"' in repr(c4_capsule)
c5 = mlir.ir.Context._CAPICreate(c4_capsule)
assert c4 is c5