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"""
# Design
This file converts from a GFortran module file representation (documented in
the `gfort_mod_parser.py` module) to an Abstract Semantic Representation (ASR).
"""
# TODO: move this into the lfortran package itself
import sys
sys.path.append("../..")
from lfortran.ast import ast
from lfortran.ast.ast_to_src import ast_to_src
import lfortran.adapters.gfortran.mod as gp
class Type(object):
pass
class Intrinsic(Type):
__slots__ = ["kind"]
def __init__(self, kind=None):
#super(Intrinsic, self).__init__()
self.kind = kind
class Integer(Intrinsic):
def __str__(self):
return "integer"
class Real(Intrinsic):
def __str__(self):
return "real"
class Complex(Intrinsic):
def __repr__(self):
return "Complex()"
class String(Intrinsic):
def __repr__(self):
return "String()"
class Logical(Intrinsic):
def __repr__(self):
return "Logical()"
class Derived(Type):
def __repr__(self):
return "Derived()"
class Array(Type):
__slots__ = ["type", "ndim", "atype", "bounds"]
class Arg:
__slots__ = ["name", "intent", "type", "symtab", "symidx"]
def get_decl(self):
s = "%s, intent(%s) :: %s" % (self.type, self.intent, self.name)
return s
def tofortran_arg(self):
return ast.arg(self.name)
def tofortran_bound(self, b):
if isinstance(b, gp.Integer):
if b.i == 1:
return ""
else:
return str(b.i)
elif isinstance(b, gp.VarIdx):
return self.symtab[b.idx].name
print(b)
raise NotImplementedError("Unsupported bound type")
# TODO: generate ASR in these functions. The ASR will then get converted
# to AST and to Fortran code. This will simplify all the declaration code
# below, which is implicit in the ASR's symbol table.
def tofortran_decl(self):
attrs = [
ast.Attribute(name="intent",
args=[ast.attribute_arg(arg=self.intent)]),
]
if isinstance(self.type, Array):
stype = str(self.type.type)
args = []
for i in range(self.type.ndim):
if self.type.atype == "explicit_shape":
s = self.tofortran_bound(self.type.bounds[i][0])
if s != "":
s += ":"
s += self.tofortran_bound(self.type.bounds[i][1])
args.append(s)
elif self.type.atype == "assumed_shape":
s = self.tofortran_bound(self.type.bounds[i][0])
s += ":"
args.append(s)
else:
assert False
args = [ast.attribute_arg(arg=x) for x in args]
attrs.append(ast.Attribute(name="dimension", args=args))
else:
stype = str(self.type)
decl = ast.decl(sym=self.name, sym_type=stype,
dims=[], attrs=attrs)
return ast.Declaration(vars=[decl], lineno=1, col_offset=1)
def tofortran_cdecl(self):
attrs = [
ast.Attribute(name="intent",
args=[ast.attribute_arg(arg=self.intent)]),
]
if isinstance(self.type, Array):
args = []
if self.type.atype == "assumed_shape":
if self.type.ndim == 1:
stype = "type(c_desc1_t)"
elif self.type.ndim == 2:
stype = "type(c_desc2_t)"
else:
raise NotImplementedError("Assumed shape dim")
else:
stype = str(self.type.type)
for i in range(self.type.ndim):
if self.type.atype == "explicit_shape":
s = self.tofortran_bound(self.type.bounds[i][0])
if s != "":
s += ":"
s += self.tofortran_bound(self.type.bounds[i][1])
args.append(s)
else:
assert False
args = [ast.attribute_arg(arg=x) for x in args]
attrs.append(ast.Attribute(name="dimension", args=args))
else:
stype = str(self.type)
decl = ast.decl(sym=self.name, sym_type=stype,
dims=[], attrs=attrs)
return ast.Declaration(vars=[decl], lineno=1, col_offset=1)
class Function:
__slots__ = ["name", "args", "return_type", "mangled_name"]
def tofortran_impl(self):
args = [x.tofortran_arg() for x in self.args]
args_decl = [x.tofortran_decl() for x in self.args]
iface_decl = [
ast.Interface2(name="x", procs=[self.tofortran_iface()], lineno=1, col_offset=1)
]
return_var = ast.Name(id="r", lineno=1, col_offset=1)
cname = self.name + "_c_wrapper"
cargs = []
for x in self.args:
a = ast.Name(id=x.name, lineno=1, col_offset=1)
if isinstance(x.type, Array) and x.type.atype == "assumed_shape":
cargs.append(
ast.FuncCallOrArray(
func="c_desc", args=[a], keywords=[],
lineno=1, col_offset=1
)
)
else:
cargs.append(a)
body = [
ast.Assignment(
target=return_var,
value=ast.FuncCallOrArray(
func=cname, args=cargs, keywords=[],
lineno=1, col_offset=1
),
lineno=1, col_offset=1
)
]
return ast.Function(name=self.name, args=args,
return_type=str(self.return_type), return_var=return_var, bind=None,
use=[],
decl=args_decl+iface_decl, body=body, contains=[], lineno=1,
col_offset=1)
def tofortran_iface(self):
args = [x.tofortran_arg() for x in self.args]
args_decl = [x.tofortran_cdecl() for x in self.args]
use = [
ast.Use(module="gfort_interop",
symbols=[
ast.UseSymbol(sym="c_desc1_t", rename=None),
ast.UseSymbol(sym="c_desc2_t", rename=None),
], lineno=1, col_offset=1)
]
cname = self.name + "_c_wrapper"
bind_args = [ast.keyword(arg=None, value=ast.Name(id="c", lineno=1, col_offset=1)),
ast.keyword(arg="name", value=ast.Str(s=self.mangled_name, lineno=1, col_offset=1))]
bind = ast.Bind(args=bind_args)
return ast.Function(name=cname, args=args,
return_type=str(self.return_type), return_var=None,
bind=bind, use=use,
decl=args_decl, body=[], contains=[], lineno=1, col_offset=1)
class Module:
__slots__ = ["name", "contains"]
def tofortran(self):
contains = [x.tofortran_impl() for x in self.contains]
use = [
ast.Use(module="gfort_interop",
symbols=[
ast.UseSymbol(sym="c_desc", rename=None),
], lineno=1, col_offset=1)
]
return ast.Module(name=self.name, use=use, decl=[], contains=contains)
def convert_arg(table, idx):
arg = table[idx]
a = Arg()
assert isinstance(arg.name, str)
a.name = arg.name
assert isinstance(arg.intent, str)
a.intent = arg.intent
assert isinstance(table, dict)
a.symtab = table
assert isinstance(idx, int)
a.symidx = idx
assert isinstance(arg.type, str)
type_ = arg.type
if arg.bounds:
ar = Array()
ar.type = type_
ar.ndim = len(arg.bounds)
if arg.bounds[0][1] is None:
ar.atype = "assumed_shape"
else:
ar.atype = "explicit_shape"
ar.bounds = arg.bounds
a.type = ar
else:
a.type = type_
return a
def convert_function(table, f):
assert isinstance(f, gp.Procedure)
fn = Function()
assert isinstance(f.name, str)
fn.name = f.name
assert isinstance(f.type, str)
fn.return_type = f.type
fn.mangled_name = '__' + f.mod + '_MOD_' + f.name.lower()
args = []
for arg in f.args:
assert isinstance(arg, gp.VarIdx)
args.append(convert_arg(table, arg.idx))
fn.args = args
return fn
def convert_module(table, public_symbols):
m = Module()
contains = []
module_name = None
for sym in public_symbols:
s = table[sym.idx.idx]
if isinstance(s, gp.Module):
# Skip modules if they are listed in public symbols
continue
assert isinstance(s, gp.Procedure)
if module_name:
assert module_name == s.mod
else:
module_name = s.mod
contains.append(convert_function(table, s))
m.name = module_name
m.contains = contains
return m
version, orig_file, table, public_symbols = gp.load_module("mod1.mod")
m = convert_module(table, public_symbols)
a = m.tofortran()
a.name = "mod2"
s = ast_to_src(a)
print(s)
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