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parser.py
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parser.py
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import inspect
import ast
import ir
ir.generate_asdl_file()
import _asdl.loma as loma_ir
import attrs
import error
def annotation_to_inout(arg) -> loma_ir.inout:
""" Determine whether the function argument
is input or output.
In[float] -> input
Out[int] -> output
"""
annotation = arg.annotation
if type(annotation) != ast.Subscript:
raise error.FuncArgNotAnnotated(arg)
# TODO: error message
assert type(annotation.value) == ast.Name
if annotation.value.id == 'In':
return loma_ir.In()
elif annotation.value.id == 'Out':
return loma_ir.Out()
else:
# TODO: error message
assert False
def annotation_to_type(node) -> loma_ir.type:
""" Given a Python AST node, returns the corresponding
loma type
"""
match node:
case ast.Name():
if node.id == 'int':
return loma_ir.Int()
elif node.id == 'float':
return loma_ir.Float()
else:
# Struct members to be filled later
return loma_ir.Struct(node.id, [])
case ast.Subscript():
assert isinstance(node.value, ast.Name)
if node.value.id == 'In' or node.value.id == 'Out':
# Ignore input/output qualifiers
return annotation_to_type(node.slice)
elif node.value.id == 'Array':
array_type = node.slice
static_size = None
if isinstance(array_type, ast.Tuple):
assert len(array_type.elts) == 2 # TODO: error message
assert isinstance(array_type.elts[1], ast.Constant)
static_size = int(array_type.elts[1].value)
array_type = array_type.elts[0]
return loma_ir.Array(annotation_to_type(array_type), static_size)
elif node.value.id == 'Diff':
# This is a "differential type" -- we'll resolve this in autodiff
return loma_ir.Diff(annotation_to_type(node.slice))
else:
# TODO: error message
assert False
case _:
assert False
def ast_cmp_op_convert(node) -> loma_ir.bin_op:
""" Given a Python AST node representing
a comparison operator,
convert to the corresponding loma
comparison operator.
"""
match node:
case ast.Lt():
return loma_ir.Less()
case ast.LtE():
return loma_ir.LessEqual()
case ast.Gt():
return loma_ir.Greater()
case ast.GtE():
return loma_ir.GreaterEqual()
case ast.Eq():
return loma_ir.Equal()
case ast.And():
return loma_ir.And()
case ast.Or():
return loma_ir.Or()
case _:
# TODO: error message
assert False
def parse_ref(node) -> loma_ir.expr:
""" Given a Python AST node representing
a LHS reference,
convert to the corresponding loma expression.
"""
match node:
case ast.Name():
return loma_ir.Var(node.id)
case ast.Subscript():
return loma_ir.ArrayAccess(parse_ref(node.value),
visit_expr(node.slice))
case ast.Attribute():
return loma_ir.StructAccess(parse_ref(node.value),
node.attr)
case _:
# TODO: error message
assert False
def visit_FunctionDef(node) -> loma_ir.FunctionDef:
""" Given a Python AST node representing
a function definition,
convert to the corresponding loma
FunctionDef.
"""
node_args = node.args
assert node_args.vararg is None
assert node_args.kwarg is None
args = [loma_ir.Arg(arg.arg,
annotation_to_type(arg.annotation),
annotation_to_inout(arg)) for arg in node_args.args]
body = [visit_stmt(b) for b in node.body]
ret_type = None
if node.returns:
ret_type = annotation_to_type(node.returns)
is_simd = False
is_openMpi = False
for decorator in node.decorator_list:
if isinstance(decorator, ast.Name):
if decorator.id == 'simd':
is_simd = True
elif decorator.id == 'openMpi':
is_openMpi = True
return loma_ir.FunctionDef(node.name,
args,
body,
is_simd,
is_openMpi,
ret_type = ret_type,
lineno = node.lineno,
)
def visit_Differentiate(node) -> loma_ir.func:
""" Given a Python AST node representing
a global assignment,
convert to the corresponding loma
derivative function declaration.
For example, the following Python code
d_foo = fwd_diff(foo)
converts to
loma_ir.ForwardDiff('d_foo', 'foo')
"""
assert isinstance(node, ast.Assign)
assert len(node.targets) == 1
func_id = node.targets[0].id
assert isinstance(node.value, ast.Call)
call_name = node.value.func
assert isinstance(call_name, ast.Name)
call_name = call_name.id
assert len(node.value.args) == 1
primal_func_id = node.value.args[0]
assert isinstance(primal_func_id, ast.Name)
primal_func_id = primal_func_id.id
if call_name == 'fwd_diff':
return loma_ir.ForwardDiff(func_id, primal_func_id, lineno = node.lineno)
elif call_name == 'rev_diff':
return loma_ir.ReverseDiff(func_id, primal_func_id, lineno = node.lineno)
else:
assert False, f'Unknown function transform operation {call_name}'
def visit_ClassDef(node) -> loma_ir.Struct:
""" Given a Python AST node representing a class definition,
convert to a loma Struct.
e.g.,
class Foo:
x : int
y : float
"""
members = []
for member in node.body:
match member:
case ast.AnnAssign():
assert isinstance(member.target, ast.Name)
t = annotation_to_type(member.annotation)
members.append(loma_ir.MemberDef(member.target.id, t))
case _:
assert False, f'Unknown class member statement {type(member).__name__}'
return loma_ir.Struct(node.name, members, lineno = node.lineno)
def visit_stmt(node) -> loma_ir.stmt:
""" Given a Python AST node representing a statement,
converts to a loma IR statement.
"""
match node:
case ast.Return():
return loma_ir.Return(visit_expr(node.value), lineno = node.lineno)
case ast.AnnAssign():
t = annotation_to_type(node.annotation)
return loma_ir.Declare(node.target.id,
t,
visit_expr(node.value),
lineno = node.lineno)
case ast.Assign():
assert len(node.targets) == 1
target = node.targets[0]
return loma_ir.Assign(parse_ref(target),
visit_expr(node.value),
lineno = node.lineno)
case ast.If():
cond = visit_expr(node.test)
then_stmts = [visit_stmt(s) for s in node.body]
else_stmts = [visit_stmt(s) for s in node.orelse]
return loma_ir.IfElse(cond,
then_stmts,
else_stmts,
lineno = node.lineno)
case ast.While():
# node.test needs to be a two items tuple
# (condition, max_iter := ...)
# where condition is an expression, and max_iter is an assignemt
# of a compile-time static integer
# TODO: error messages
assert isinstance(node.test, ast.Tuple)
assert len(node.test.elts) == 2
cond = visit_expr(node.test.elts[0])
max_iter_assign = node.test.elts[1]
assert isinstance(max_iter_assign, ast.NamedExpr)
assert max_iter_assign.target.id == 'max_iter'
assert isinstance(max_iter_assign.value, ast.Constant)
max_iter = int(max_iter_assign.value.value)
body = [visit_stmt(s) for s in node.body]
return loma_ir.While(cond, max_iter, body, lineno = node.lineno)
case ast.Expr():
# TODO: error messages
assert isinstance(node.value, ast.Call)
call_expr = visit_expr(node.value)
return loma_ir.CallStmt(call_expr, lineno = node.lineno)
case _:
assert False, f'Unknown statement {type(node).__name__}'
def visit_expr(node) -> loma_ir.expr:
""" Given a Python AST node representing an expression,
converts to a loma IR expression.
"""
match node:
case ast.Name():
return loma_ir.Var(node.id, lineno = node.lineno)
case ast.Constant():
if type(node.value) == int:
return loma_ir.ConstInt(node.value, lineno = node.lineno)
elif type(node.value) == float:
return loma_ir.ConstFloat(node.value, lineno = node.lineno)
else:
assert False, f'Unknown constant type'
case ast.UnaryOp():
if isinstance(node.op, ast.USub):
return loma_ir.BinaryOp(loma_ir.Sub(), loma_ir.ConstInt(0), visit_expr(node.operand), lineno = node.lineno)
else:
assert False, f'Unknown UnaryOp {type(node.op).__name__}'
case ast.BinOp():
match node.op:
case ast.Add():
return loma_ir.BinaryOp(loma_ir.Add(),
visit_expr(node.left),
visit_expr(node.right),
lineno = node.lineno)
case ast.Sub():
return loma_ir.BinaryOp(loma_ir.Sub(),
visit_expr(node.left),
visit_expr(node.right),
lineno = node.lineno)
case ast.Mult():
return loma_ir.BinaryOp(loma_ir.Mul(),
visit_expr(node.left),
visit_expr(node.right),
lineno = node.lineno)
case ast.Div():
return loma_ir.BinaryOp(loma_ir.Div(),
visit_expr(node.left),
visit_expr(node.right),
lineno = node.lineno)
case _:
assert False, f'Unknown BinOp {type(node.op).__name__}'
case ast.Subscript():
return loma_ir.ArrayAccess(visit_expr(node.value),
visit_expr(node.slice),
lineno = node.lineno)
case ast.Attribute():
return loma_ir.StructAccess(visit_expr(node.value),
node.attr,
lineno = node.lineno)
case ast.Compare():
assert len(node.ops) == 1
assert len(node.comparators) == 1
op = ast_cmp_op_convert(node.ops[0])
left = visit_expr(node.left)
right = visit_expr(node.comparators[0])
return loma_ir.BinaryOp(op, left, right, lineno = node.lineno)
case ast.BoolOp():
op = ast_cmp_op_convert(node.op)
assert len(node.values) == 2
left = visit_expr(node.values[0])
right = visit_expr(node.values[1])
return loma_ir.BinaryOp(op, left, right, lineno = node.lineno)
case ast.Call():
assert type(node.func) == ast.Name
return loma_ir.Call(node.func.id,
[visit_expr(arg) for arg in node.args],
lineno = node.lineno)
case None:
return None
case _:
assert False, f'Unknown expr {type(node).__name__}'
def check_struct(t : loma_ir.type):
# check if the struct has zero length member, recursively
if isinstance(t, loma_ir.Int) or isinstance(t, loma_ir.Float):
return False
if isinstance(t, loma_ir.Array):
return check_struct(t.t)
if len(t.members) == 0:
return True
for m in t.members:
if isinstance(m.t, loma_ir.Struct) or \
isinstance(m.t, loma_ir.Array):
if check_struct(m.t):
return True
return False
def check_structs(structs : dict[str, loma_ir.Struct]):
for s in structs.values():
if check_struct(s):
return True
return False
def fill_structs(s : loma_ir.Struct,
structs : dict[str, loma_ir.Struct]):
assert isinstance(s, loma_ir.Struct)
new_members = []
for m in s.members:
new_m = m
if isinstance(m.t, loma_ir.Struct):
new_m = attrs.evolve(m, t=structs[m.t.id])
elif isinstance(m.t, loma_ir.Array):
new_m = attrs.evolve(m,
t=loma_ir.Array(structs[m.t.t.id], m.t.static_size))
new_members.append(new_m)
return attrs.evolve(s, members=new_members)
def parse(code : str) -> tuple[dict[str, loma_ir.Struct], dict[str, loma_ir.func]]:
""" Given a loma frontend code represented as a string,
convert the code to loma IR.
Returns both the parsed loma Structs and functions.
"""
module = ast.parse(code)
structs = {}
for d in module.body:
if isinstance(d, ast.ClassDef):
s = visit_ClassDef(d)
structs[s.id] = s
# Fill in struct information, run until converge
while check_structs(structs):
for k, s in structs.items():
structs[k] = fill_structs(s, structs)
funcs = {}
for d in module.body:
if isinstance(d, ast.FunctionDef):
f = visit_FunctionDef(d)
funcs[f.id] = f
elif isinstance(d, ast.Assign):
f = visit_Differentiate(d)
funcs[f.id] = f
return structs, funcs
# type: ignore