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"""
# Design
This file converts from a GFortran module file representation (documented in
the `lfortran.adapters.gfortran.mod` module) to an Abstract Semantic Representation (ASR).
"""
# TODO: move this into the lfortran package itself
import sys
sys.path.append("../..")
from lfortran.asr import asr
from lfortran.asr.asr_check import verify_asr
from lfortran.asr.asr_to_ast import asr_to_ast
from lfortran.ast.ast_to_src import ast_to_src
from lfortran.adapters.gfortran.mod import mod_to_asr
from lfortran.asr.builder import (make_translation_unit,
translation_unit_make_module, scope_add_function, make_type_integer,
make_type_real, type_eq, make_binop, scope_add_symbol, Scope,
function_make_var, array_is_assumed_shape)
class NodeTransformer(asr.NodeTransformerBase):
def visit_scope(self, symtab, parent=None):
new_symtab = Scope(parent)
self._lookup = 2
self._scope = new_symtab
for s, sym in symtab.symbols.items():
new_symtab.symbols[s] = self.visit(sym)
self._lookup = 0
return new_symtab
def visit_sequence(self, seq):
r = []
if seq is not None:
for node in seq:
r.append(self.visit(node))
return r
def visit_object(self, o):
if isinstance(o, Scope):
return self.visit_scope(o)
elif isinstance(o, list):
return self.visit_sequence(o)
elif isinstance(o, (str, int)) or o is None:
return o
else:
print(type(o))
raise NotImplementedError()
def visit_Function(self, node):
name = self.visit_object(node.name)
symtab = self.visit_object(node.symtab)
self._lookup = 1
self._scope = symtab
args = self.visit_sequence(node.args)
body = self.visit_sequence(node.body)
return_var = self.visit(node.return_var)
self._lookup = 0
if node.bind:
bind = self.visit(node.bind)
else:
bind = None
return asr.Function(name=name, args=args, body=body, bind=bind, return_var=return_var, symtab=symtab)
def visit_VariableOld(self, node):
if self._lookup == 1:
return self._scope.resolve(node.name)
elif self._lookup == 2:
v = self._scope.resolve(node.name, raise_exception=False)
if v:
return v
name = self.visit_object(node.name)
intent = self.visit_object(node.intent)
dummy = self.visit_object(node.dummy)
type = self.visit(node.type)
return asr.VariableOld(name=name, intent=intent, dummy=dummy, type=type)
class WrapperVisitor(NodeTransformer):
def visit_Module(self, node):
name = "mod2" #node.name + "_wrapper"
self._modname = node.name
symtab = self.visit_scope(node.symtab)
return asr.Module(name=name, symtab=symtab)
def visit_Function(self, node):
name = self.visit_object(node.name)
symtab = self.visit_object(node.symtab)
self._lookup = 1
self._scope = symtab
args = self.visit_sequence(node.args)
body = self.visit_sequence(node.body)
self._lookup = 0
if node.bind:
bind = self.visit(node.bind)
else:
bind = None
tmp = asr.VariableOld(name="a", type=make_type_integer())
f = asr.Function(name=name, args=args, body=body, bind=bind,
symtab=symtab, return_var=tmp)
return_var = function_make_var(f, name="r", type=self.visit(node.return_var.type))
return_var.dummy = True
f.return_var = return_var
cname = node.name + "_c_wrapper"
mangled_name = '__' + self._modname + '_MOD_' + node.name.lower()
bind = asr.Bind(lang="c", name=mangled_name)
cargs = []
args2 = []
type1 = make_type_integer()
type1.dims = [asr.dimension(asr.Num(n=1, type=make_type_integer()))]
type2 = make_type_integer()
type2.dims = [
asr.dimension(asr.Num(n=1, type=make_type_integer())),
asr.dimension(asr.Num(n=1, type=make_type_integer()))
]
c_desc1 = scope_add_function(
symtab,
"c_desc1_int32",
args=[
asr.VariableOld(
name="A",
intent="in",
type=type1
)
],
return_var=asr.VariableOld(
name="c_desc1_int32",
type=asr.Derived(name="c_desc1_t")
),
module = "gfort_interop"
)
c_desc2 = scope_add_function(
symtab,
"c_desc2_int32",
args=[
asr.VariableOld(
name="A",
intent="in",
type=type2
)
],
return_var=asr.VariableOld(
name="c_desc2_int32",
type=asr.Derived(name="c_desc2_t")
),
module = "gfort_interop"
)
for arg in node.args:
type = self.visit(arg.type)
if array_is_assumed_shape(type):
if len(type.dims) == 1:
dname = "c_desc1_t"
fname = c_desc1
elif len(type.dims) == 2:
dname = "c_desc2_t"
fname = c_desc2
else:
raise NotImplementedError("Too many dimensions")
type = asr.Derived(name=dname, module="gfort_interop")
args2.append(asr.FuncCall(func=fname, args=[arg],
keywords=[], type=type))
else:
args2.append(arg)
cargs.append(asr.VariableOld(
name=arg.name,
intent=arg.intent,
type=type,
))
fw = scope_add_function(symtab, cname, args=cargs, return_var=cname)
fw.bind = bind
body = [
asr.Assignment(return_var,
asr.FuncCall(func=fw, args=args2, keywords=[],
type=fw.return_var.type)
)
]
f.body = body
return f
def create_wrapper(u):
v = WrapperVisitor()
u2 = v.visit(u)
verify_asr(u2)
return u2
u = mod_to_asr("mod1.mod")
a = asr_to_ast(u)
s = ast_to_src(a)
#print(s)
u2 = create_wrapper(u)
a = asr_to_ast(u2)
s = ast_to_src(a)
#print("-"*80)
print(s)
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