artiq/examples/transform.py

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import inspect, textwrap, ast, types
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from artiq import units, unparse
def find_kernel_body(node):
while True:
if isinstance(node, ast.Module):
if len(node.body) != 1:
raise TypeError
node = node.body[0]
elif isinstance(node, ast.FunctionDef):
return node.body
else:
raise TypeError
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def eval_ast(expr, symdict=dict()):
if not isinstance(expr, ast.Expression):
expr = ast.Expression(expr)
code = compile(expr, "<ast>", "eval")
return eval(code, symdict)
def _try_eval_with_units(node):
try:
r = eval_ast(node, units.__dict__)
except:
return node
if isinstance(r, units.Quantity):
return ast.copy_location(ast.Num(n=r.amount), node)
else:
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return node
def explicit_delays(stmts):
insertions = []
for i, stmt in enumerate(stmts):
if isinstance(stmt, (ast.For, ast.While, ast.If)):
explicit_delays(stmt.body)
explicit_delays(stmt.orelse)
elif isinstance(stmt, ast.With):
explicit_delays(stmt.body)
elif isinstance(stmt, ast.Expr):
if not isinstance(stmt.value, ast.Call) or not isinstance(stmt.value.func, ast.Name):
continue
call = stmt.value
name = call.func.id
if name == "delay":
call.args[0] = _try_eval_with_units(call.args[0])
elif name == "pulse":
call.func.id = "pulse_start"
insertions.append((i+1, ast.copy_location(
ast.Expr(ast.Call(func=ast.Name(id="delay", ctx=ast.Load()),
args=[_try_eval_with_units(call.args[2])],
keywords=[], starargs=[], kwargs=[])),
stmt)))
for i, (location, stmt) in enumerate(insertions):
stmts.insert(location+i, stmt)
def _count_stmts(node):
if isinstance(node, (ast.For, ast.While, ast.If)):
print(ast.dump(node))
return 1 + _count_stmts(node.body) + _count_stmts(node.orelse)
elif isinstance(node, ast.With):
return 1 + _count_stmts(node.body)
elif isinstance(node, list):
return sum(map(_count_stmts, node))
else:
return 1
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def unroll_loops(stmts, limit):
replacements = []
for stmt_i, stmt in enumerate(stmts):
if isinstance(stmt, ast.For):
try:
it = eval_ast(stmt.iter)
except:
pass
else:
unroll_loops(stmt.body, limit)
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unroll_loops(stmt.orelse, limit)
l_it = len(it)
if l_it:
n = l_it*_count_stmts(stmt.body)
if n < limit:
replacement = []
for i in it:
if not isinstance(i, int):
replacement = None
break
replacement.append(ast.copy_location(
ast.Assign(targets=[stmt.target], value=ast.Num(n=i)), stmt))
replacement += stmt.body
if replacement is not None:
replacements.append((stmt_i, replacement))
else:
replacements.append((stmt_i, stmt.orelse))
if isinstance(stmt, (ast.While, ast.If)):
unroll_loops(stmt.body, limit)
unroll_loops(stmt.orelse, limit)
elif isinstance(stmt, ast.With):
unroll_loops(stmt.body, limit)
offset = 0
for location, new_stmts in replacements:
stmts[offset+location:offset+location+1] = new_stmts
offset += len(new_stmts) - 1
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# -1 statement duration could not be pre-determined
# 0 statement has no effect on timeline
# >0 statement is a static delay that advances the timeline by the given amount
def _get_duration(stmt):
if isinstance(stmt, (ast.Expr, ast.Assign)):
return _get_duration(stmt.value)
elif isinstance(stmt, ast.Call) and isinstance(stmt.func, ast.Name):
name = stmt.func.id
if name == "delay":
if isinstance(stmt.args[0], ast.Num):
return stmt.args[0].n
else:
return -1
elif name == "wait_edge":
return -1
else:
return 0
else:
return -1
def _merge_timelines(timelines):
r = []
current_stmts = []
for stmts in timelines:
it = iter(stmts)
try:
stmt = next(it)
except StopIteration:
pass
else:
current_stmts.append(types.SimpleNamespace(delay=_get_duration(stmt), stmt=stmt, it=it))
while current_stmts:
dt = min(stmt.delay for stmt in current_stmts)
if dt < 0:
# contains statement(s) with indeterminate duration
return None
if dt > 0:
# advance timeline by dt
for stmt in current_stmts:
stmt.delay -= dt
if stmt.delay == 0:
ref_stmt = stmt.stmt
delay_stmt = ast.copy_location(
ast.Expr(ast.Call(func=ast.Name(id="delay", ctx=ast.Load()),
args=[ast.Num(n=dt)],
keywords=[], starargs=[], kwargs=[])),
ref_stmt)
r.append(delay_stmt)
else:
for stmt in current_stmts:
if stmt.delay == 0:
r.append(stmt.stmt)
# discard executed statements
exhausted_list = []
for stmt_i, stmt in enumerate(current_stmts):
if stmt.delay == 0:
try:
stmt.stmt = next(stmt.it)
except StopIteration:
exhausted_list.append(stmt_i)
else:
stmt.delay = _get_duration(stmt.stmt)
for offset, i in enumerate(exhausted_list):
current_stmts.pop(i-offset)
return r
def collapse(stmts):
replacements = []
for stmt_i, stmt in enumerate(stmts):
if isinstance(stmt, (ast.For, ast.While, ast.If)):
collapse(stmt.body)
collapse(stmt.orelse)
elif isinstance(stmt, ast.With):
btype = stmt.items[0].context_expr.id
if btype == "sequential":
collapse(stmt.body)
replacements.append((stmt_i, stmt.body))
elif btype == "parallel":
timelines = [[s] for s in stmt.body]
for timeline in timelines:
collapse(timeline)
merged = _merge_timelines(timelines)
if merged is not None:
replacements.append((stmt_i, merged))
else:
raise ValueError("Unknown block type: " + btype)
offset = 0
for location, new_stmts in replacements:
stmts[offset+location:offset+location+1] = new_stmts
offset += len(new_stmts) - 1
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if __name__ == "__main__":
import collapse_test
kernel = collapse_test.collapse_test
node = ast.parse(textwrap.dedent(inspect.getsource(kernel)))
node = find_kernel_body(node)
explicit_delays(node)
unroll_loops(node, 50)
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collapse(node)
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unparse.Unparser(node)