Lichen

Annotated generator.py

232:2d23fd9e64ec
213:0ebba845f9b0
211:b9e7f0aae13c
2016-11-23 Paul Boddie file changeset files shortlog Fixed anonymous accesses, preventing accidental lookup of None. Fixed the attribute access plan output, encoding anonymous accessors.
paul@126 1 
#!/usr/bin/env python
paul@126 2 
 
 paul@126      3 
"""
 
 paul@126      4 
Generate C code from object layouts and other deduced information.
 
 paul@126      5 
 
 paul@126      6 
Copyright (C) 2015, 2016 Paul Boddie <paul@boddie.org.uk>
 
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 paul@126      8 
This program is free software; you can redistribute it and/or modify it under
 
 paul@126      9 
the terms of the GNU General Public License as published by the Free Software
 
 paul@126     10 
Foundation; either version 3 of the License, or (at your option) any later
 
 paul@126     11 
version.
 
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This program is distributed in the hope that it will be useful, but WITHOUT
 
 paul@126     14 
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 
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FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 
 paul@126     16 
details.
 
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 paul@126     18 
You should have received a copy of the GNU General Public License along with
 
 paul@126     19 
this program.  If not, see <http://www.gnu.org/licenses/>.
 
 paul@126     20 
"""
 
 paul@126     21 
 
 paul@126     22 
from common import CommonOutput
 
 paul@126     23 
from encoders import encode_bound_reference, encode_function_pointer, \
 
 paul@136     24 
                     encode_instantiator_pointer, \
 
 paul@136     25 
                     encode_literal_constant, encode_literal_constant_member, \
 
 paul@159     26 
                     encode_literal_constant_value, \
 
 paul@159     27 
                     encode_literal_instantiator, encode_literal_reference, \
 
 paul@136     28 
                     encode_path, \
 
 paul@150     29 
                     encode_predefined_reference, encode_size, \
 
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                     encode_symbol, encode_tablename, \
 
 paul@132     31 
                     encode_type_attribute
 
 paul@126     32 
from os import listdir
 
 paul@183     33 
from os.path import exists, isdir, join, split
 
 paul@126     34 
from referencing import Reference
 
 paul@126     35 
 
 paul@126     36 
def copy(source, target):
 
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    "Copy a text file from 'source' to 'target'."
 
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    if isdir(target):
 
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        target = join(target, split(source)[-1])
 
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    infile = open(source)
 
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    outfile = open(target, "w")
 
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    try:
 
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        outfile.write(infile.read())
 
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    finally:
 
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        outfile.close()
 
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        infile.close()
 
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class Generator(CommonOutput):
 
 paul@126     51 
 
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    "A code generator."
 
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    function_type = "__builtins__.core.function"
 
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    # NOTE: These must be synchronised with the library.
 
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    predefined_constant_members = (
 
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        ("__builtins__.boolean", "False"),
 
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        ("__builtins__.boolean", "True"),
 
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        ("__builtins__.none", "None"),
 
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        ("__builtins__.notimplemented", "NotImplemented"),
 
 paul@136     63 
        )
 
 paul@136     64 
 
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    literal_instantiator_types = (
 
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        "__builtins__.dict.dict",
 
 paul@159     67 
        "__builtins__.list.list",
 
 paul@159     68 
        "__builtins__.tuple.tuple",
 
 paul@159     69 
        )
 
 paul@159     70 
 
 paul@126     71 
    def __init__(self, importer, optimiser, output):
 
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        self.importer = importer
 
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        self.optimiser = optimiser
 
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        self.output = output
 
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    def to_output(self, debug=False):
 
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        "Write the generated code."
 
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        self.check_output()
 
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        self.write_structures()
 
 paul@183     82 
        self.copy_templates(debug)
 
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 paul@183     84 
    def copy_templates(self, debug=False):
 
 paul@126     85 
 
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        "Copy template files to the generated output directory."
 
 paul@126     87 
 
 paul@126     88 
        templates = join(split(__file__)[0], "templates")
 
 paul@126     89 
 
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        for filename in listdir(templates):
 
 paul@183     91 
            target = self.output
 
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            # Handle debug resources.
 
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            if filename.endswith("-debug"):
 
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                if debug:
 
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                    target = join(self.output, filename[:-len("-debug")])
 
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                else:
 
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                    continue
 
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            # Handle non-debug resources.
 
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            if debug and exists(join(templates, "%s-debug" % filename)):
 
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                continue
 
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            copy(join(templates, filename), target)
 
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    def write_structures(self):
 
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        "Write structures used by the program."
 
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        f_consts = open(join(self.output, "progconsts.h"), "w")
 
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        f_defs = open(join(self.output, "progtypes.c"), "w")
 
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        f_decls = open(join(self.output, "progtypes.h"), "w")
 
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        f_signatures = open(join(self.output, "main.h"), "w")
 
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        f_code = open(join(self.output, "main.c"), "w")
 
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        try:
 
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            # Output boilerplate.
 
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            print >>f_consts, """\
 
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#ifndef __PROGCONSTS_H__
 
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#define __PROGCONSTS_H__
 
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"""
 
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            print >>f_decls, """\
 
 paul@126    126 
#ifndef __PROGTYPES_H__
 
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#define __PROGTYPES_H__
 
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#include "progconsts.h"
 
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#include "types.h"
 
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"""
 
 paul@126    132 
            print >>f_defs, """\
 
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#include "progtypes.h"
 
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#include "progops.h"
 
 paul@126    135 
#include "main.h"
 
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"""
 
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            print >>f_signatures, """\
 
 paul@126    138 
#ifndef __MAIN_H__
 
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#define __MAIN_H__
 
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#include "types.h"
 
 paul@126    142 
"""
 
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            print >>f_code, """\
 
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#include <string.h>
 
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#include <stdio.h>
 
 paul@126    146 
#include "types.h"
 
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#include "exceptions.h"
 
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#include "ops.h"
 
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#include "progconsts.h"
 
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#include "progtypes.h"
 
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#include "progops.h"
 
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#include "main.h"
 
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"""
 
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            # Generate table and structure data.
 
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            function_instance_attrs = None
 
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            objects = self.optimiser.attr_table.items()
 
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            objects.sort()
 
 paul@126    160 
 
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            for ref, indexes in objects:
 
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                attrnames = self.get_attribute_names(indexes)
 
 paul@126    163 
 
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                kind = ref.get_kind()
 
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                path = ref.get_origin()
 
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                table_name = encode_tablename(kind, path)
 
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                structure_size = encode_size(kind, path)
 
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                # Generate structures for classes and modules.
 
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                if kind != "<instance>":
 
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                    structure = []
 
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                    attrs = self.get_static_attributes(kind, path, attrnames)
 
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                    # Set a special instantiator on the class.
 
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                    if kind == "<class>":
 
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                        attrs["__fn__"] = path
 
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                        attrs["__args__"] = encode_size("pmin", path)
 
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                        # Write instantiator declarations based on the
 
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                        # applicable initialiser.
 
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                        init_ref = attrs["__init__"]
 
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                        # Write instantiator definitions.
 
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                        self.write_instantiator(f_code, f_signatures, path, init_ref)
 
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                        # Write parameter table.
 
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                        self.make_parameter_table(f_decls, f_defs, path, init_ref.get_origin())
 
 paul@126    193 
 
 paul@126    194 
                    self.populate_structure(Reference(kind, path), attrs, kind, structure)
 
 paul@136    195 
 
 paul@136    196 
                    if kind == "<class>":
 
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                        self.write_instance_structure(f_decls, path, structure_size)
 
 paul@136    198 
 
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                    self.write_structure(f_decls, f_defs, path, table_name, structure,
 
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                        kind == "<class>" and path)
 
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                # Record function instance details for function generation below.
 
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                else:
 
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                    attrs = self.get_instance_attributes(path, attrnames)
 
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                    if path == self.function_type:
 
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                        function_instance_attrs = attrs
 
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                # Write a table for all objects.
 
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                table = []
 
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                self.populate_table(Reference(kind, path), table)
 
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                self.write_table(f_decls, f_defs, table_name, structure_size, table)
 
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            # Generate function instances.
 
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            functions = self.importer.function_parameters.keys()
 
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            functions.sort()
 
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            extra_function_instances = []
 
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            for path in functions:
 
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                # Instantiators are generated above.
 
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                if self.importer.classes.has_key(path) or not self.importer.get_object(path):
 
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                    continue
 
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                cls = self.function_type
 
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                table_name = encode_tablename("<instance>", cls)
 
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                structure_size = encode_size("<instance>", path)
 
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                # Set a special callable attribute on the instance.
 
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                function_instance_attrs["__fn__"] = path
 
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                function_instance_attrs["__args__"] = encode_size("pmin", path)
 
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                # Produce two structures where a method is involved.
 
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                parent, name = path.rsplit(".", 1)
 
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                parent_ref = self.importer.get_object(parent)
 
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                parent_kind = parent_ref and parent_ref.get_kind()
 
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                # Populate and write each structure.
 
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                if parent_kind == "<class>":
 
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                    # A bound version of a method.
 
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                    structure = self.populate_function(path, function_instance_attrs, False)
 
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                    self.write_structure(f_decls, f_defs, encode_bound_reference(path), table_name, structure)
 
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                    # An unbound version of a method.
 
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                    structure = self.populate_function(path, function_instance_attrs, True)
 
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                    self.write_structure(f_decls, f_defs, path, table_name, structure)
 
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                else:
 
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                    # A normal function.
 
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                    structure = self.populate_function(path, function_instance_attrs, False)
 
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                    self.write_structure(f_decls, f_defs, path, table_name, structure)
 
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                # Functions with defaults need to declare instance structures.
 
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                if self.importer.function_defaults.get(path):
 
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                    self.write_instance_structure(f_decls, path, structure_size)
 
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                    extra_function_instances.append(path)
 
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                # Write function declarations.
 
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                # Signature: __attr <name>(__attr[]);
 
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                print >>f_signatures, "__attr %s(__attr args[]);" % encode_function_pointer(path)
 
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                # Write parameter table.
 
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                self.make_parameter_table(f_decls, f_defs, path, path)
 
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            # Generate predefined constants.
 
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            for path, name in self.predefined_constant_members:
 
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                self.make_predefined_constant(f_decls, f_defs, path, name)
 
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            # Generate literal constants.
 
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            for value, n in self.optimiser.constants.items():
 
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                self.make_literal_constant(f_decls, f_defs, n, value)
 
 paul@136    287 
 
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            # Finish the main source file.
 
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            self.write_main_program(f_code, f_signatures)
 
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            # Record size information for certain function instances as well as
 
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            # for classes, modules and other instances.
 
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            size_tables = {}
 
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            for kind in ["<class>", "<module>", "<instance>"]:
 
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                size_tables[kind] = {}
 
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            # Generate structure size data.
 
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            for ref, structure in self.optimiser.structures.items():
 
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                size_tables[ref.get_kind()][ref.get_origin()] = len(structure)
 
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            for path in extra_function_instances:
 
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                defaults = self.importer.function_defaults[path]
 
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                size_tables["<instance>"][path] = size_tables["<instance>"][self.function_type] + len(defaults)
 
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            size_tables = size_tables.items()
 
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            size_tables.sort()
 
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            for kind, sizes in size_tables:
 
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                self.write_size_constants(f_consts, kind, sizes, 0)
 
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            # Generate parameter table size data.
 
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            min_sizes = {}
 
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            max_sizes = {}
 
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            for path, parameters in self.optimiser.parameters.items():
 
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                argmin, argmax = self.get_argument_limits(path)
 
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                min_sizes[path] = argmin
 
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                max_sizes[path] = argmax
 
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                # Record instantiator limits.
 
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                if path.endswith(".__init__"):
 
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                    path = path[:-len(".__init__")]
 
 paul@211    329 
 
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            self.write_size_constants(f_consts, "pmin", min_sizes, 0)
 
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            self.write_size_constants(f_consts, "pmax", max_sizes, 0)
 
 paul@211    332 
 
 paul@211    333 
            # Generate parameter codes.
 
 paul@211    334 
 
 paul@211    335 
            self.write_code_constants(f_consts, self.optimiser.all_paramnames, self.optimiser.arg_locations, "pcode", "ppos")
 
 paul@211    336 
 
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            # Generate attribute codes.
 
 paul@211    338 
 
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            self.write_code_constants(f_consts, self.optimiser.all_attrnames, self.optimiser.locations, "code", "pos")
 
 paul@211    340 
 
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            # Output more boilerplate.
 
 paul@126    342 
 
 paul@126    343 
            print >>f_consts, """\
 
 paul@126    344 
 
 paul@126    345 
#endif /* __PROGCONSTS_H__ */"""
 
 paul@126    346 
 
 paul@126    347 
            print >>f_decls, """\
 
 paul@126    348 
 
 paul@126    349 
#define __FUNCTION_TYPE %s
 
 paul@126    350 
#define __FUNCTION_INSTANCE_SIZE %s
 
 paul@126    351 
 
 paul@126    352 
#endif /* __PROGTYPES_H__ */""" % (
 
 paul@126    353 
    encode_path(self.function_type),
 
 paul@150    354 
    encode_size("<instance>", self.function_type)
 
 paul@126    355 
    )
 
 paul@126    356 
 
 paul@126    357 
            print >>f_signatures, """\
 
 paul@126    358 
 
 paul@126    359 
#endif /* __MAIN_H__ */"""
 
 paul@126    360 
 
 paul@126    361 
        finally:
 
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            f_consts.close()
 
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            f_defs.close()
 
 paul@126    364 
            f_decls.close()
 
 paul@126    365 
            f_signatures.close()
 
 paul@126    366 
            f_code.close()
 
 paul@126    367 
 
 paul@136    368 
    def make_literal_constant(self, f_decls, f_defs, n, value):
 
 paul@136    369 
 
 paul@136    370 
        """
 
 paul@136    371 
        Write literal constant details to 'f_decls' (to declare a structure) and
 
 paul@136    372 
        to 'f_defs' (to define the contents) for the constant with the number
 
 paul@136    373 
        'n' with the given literal 'value'.
 
 paul@136    374 
        """
 
 paul@136    375 
 
 paul@136    376 
        const_path = encode_literal_constant(n)
 
 paul@136    377 
        structure_name = encode_literal_reference(n)
 
 paul@136    378 
 
 paul@136    379 
        # NOTE: This makes assumptions about the __builtins__ structure.
 
 paul@136    380 
 
 paul@188    381 
        modname = value.__class__.__name__
 
 paul@188    382 
        typename = modname == "str" and "string" or modname
 
 paul@188    383 
        ref = Reference("<instance>", "__builtins__.%s.%s" % (modname, typename))
 
 paul@136    384 
 
 paul@136    385 
        self.make_constant(f_decls, f_defs, ref, const_path, structure_name, value)
 
 paul@136    386 
 
 paul@136    387 
    def make_predefined_constant(self, f_decls, f_defs, path, name):
 
 paul@136    388 
 
 paul@136    389 
        """
 
 paul@136    390 
        Write predefined constant details to 'f_decls' (to declare a structure)
 
 paul@136    391 
        and to 'f_defs' (to define the contents) for the constant located in
 
 paul@136    392 
        'path' with the given 'name'.
 
 paul@136    393 
        """
 
 paul@136    394 
 
 paul@136    395 
        # Determine the details of the constant.
 
 paul@136    396 
 
 paul@136    397 
        attr_path = "%s.%s" % (path, name)
 
 paul@136    398 
        structure_name = encode_predefined_reference(attr_path)
 
 paul@136    399 
        ref = self.importer.get_object(attr_path)
 
 paul@136    400 
 
 paul@136    401 
        self.make_constant(f_decls, f_defs, ref, attr_path, structure_name)
 
 paul@136    402 
 
 paul@136    403 
    def make_constant(self, f_decls, f_defs, ref, const_path, structure_name, data=None):
 
 paul@136    404 
 
 paul@136    405 
        """
 
 paul@136    406 
        Write constant details to 'f_decls' (to declare a structure) and to
 
 paul@136    407 
        'f_defs' (to define the contents) for the constant described by 'ref'
 
 paul@136    408 
        having the given 'path' and 'structure_name' (for the constant structure
 
 paul@136    409 
        itself).
 
 paul@136    410 
        """
 
 paul@136    411 
 
 paul@136    412 
        # Obtain the attributes.
 
 paul@136    413 
 
 paul@136    414 
        cls = ref.get_origin()
 
 paul@136    415 
        indexes = self.optimiser.attr_table[ref]
 
 paul@136    416 
        attrnames = self.get_attribute_names(indexes)
 
 paul@136    417 
        attrs = self.get_instance_attributes(cls, attrnames)
 
 paul@136    418 
 
 paul@136    419 
        # Set the data, if provided.
 
 paul@136    420 
 
 paul@136    421 
        if data is not None:
 
 paul@136    422 
            attrs["__data__"] = data
 
 paul@136    423 
 
 paul@136    424 
        # Define the structure details. An object is created for the constant,
 
 paul@136    425 
        # but an attribute is provided, referring to the object, for access to
 
 paul@136    426 
        # the constant in the program.
 
 paul@136    427 
 
 paul@136    428 
        structure = []
 
 paul@150    429 
        table_name = encode_tablename("<instance>", cls)
 
 paul@136    430 
        self.populate_structure(ref, attrs, ref.get_kind(), structure)
 
 paul@211    431 
        self.write_structure(f_decls, f_defs, structure_name, table_name, structure)
 
 paul@136    432 
 
 paul@136    433 
        # Define a macro for the constant.
 
 paul@136    434 
 
 paul@136    435 
        attr_name = encode_path(const_path)
 
 paul@136    436 
        print >>f_decls, "#define %s ((__attr) {&%s, &%s})" % (attr_name, structure_name, structure_name)
 
 paul@136    437 
 
 paul@126    438 
    def make_parameter_table(self, f_decls, f_defs, path, function_path):
 
 paul@126    439 
 
 paul@126    440 
        """
 
 paul@126    441 
        Write parameter table details to 'f_decls' (to declare a table) and to
 
 paul@126    442 
        'f_defs' (to define the contents) for the function with the given
 
 paul@126    443 
        'path', using 'function_path' to obtain the parameter details. The
 
 paul@126    444 
        latter two arguments may differ when describing an instantiator using
 
 paul@126    445 
        the details of an initialiser.
 
 paul@126    446 
        """
 
 paul@126    447 
 
 paul@126    448 
        table = []
 
 paul@150    449 
        table_name = encode_tablename("<function>", path)
 
 paul@126    450 
        structure_size = encode_size("pmax", path)
 
 paul@126    451 
        self.populate_parameter_table(function_path, table)
 
 paul@126    452 
        self.write_parameter_table(f_decls, f_defs, table_name, structure_size, table)
 
 paul@126    453 
 
 paul@126    454 
    def write_size_constants(self, f_consts, size_prefix, sizes, padding):
 
 paul@126    455 
 
 paul@126    456 
        """
 
 paul@126    457 
        Write size constants to 'f_consts' for the given 'size_prefix', using
 
 paul@126    458 
        the 'sizes' dictionary to populate the definition, adding the given
 
 paul@126    459 
        'padding' to the basic sizes.
 
 paul@126    460 
        """
 
 paul@126    461 
 
 paul@126    462 
        print >>f_consts, "enum %s {" % encode_size(size_prefix)
 
 paul@126    463 
        first = True
 
 paul@126    464 
        for path, size in sizes.items():
 
 paul@126    465 
            if not first:
 
 paul@126    466 
                print >>f_consts, ","
 
 paul@126    467 
            else:
 
 paul@126    468 
                first = False
 
 paul@126    469 
            f_consts.write("    %s = %d" % (encode_size(size_prefix, path), size + padding))
 
 paul@126    470 
        print >>f_consts, "\n    };"
 
 paul@126    471 
 
 paul@132    472 
    def write_code_constants(self, f_consts, attrnames, locations, code_prefix, pos_prefix):
 
 paul@126    473 
 
 paul@126    474 
        """
 
 paul@126    475 
        Write code constants to 'f_consts' for the given 'attrnames' and
 
 paul@126    476 
        attribute 'locations'.
 
 paul@126    477 
        """
 
 paul@126    478 
 
 paul@132    479 
        print >>f_consts, "enum %s {" % encode_symbol(code_prefix)
 
 paul@126    480 
        first = True
 
 paul@126    481 
        for i, attrname in enumerate(attrnames):
 
 paul@126    482 
            if not first:
 
 paul@126    483 
                print >>f_consts, ","
 
 paul@126    484 
            else:
 
 paul@126    485 
                first = False
 
 paul@132    486 
            f_consts.write("    %s = %d" % (encode_symbol(code_prefix, attrname), i))
 
 paul@126    487 
        print >>f_consts, "\n    };"
 
 paul@126    488 
 
 paul@132    489 
        print >>f_consts, "enum %s {" % encode_symbol(pos_prefix)
 
 paul@126    490 
        first = True
 
 paul@126    491 
        for i, attrnames in enumerate(locations):
 
 paul@126    492 
            for attrname in attrnames:
 
 paul@126    493 
                if not first:
 
 paul@126    494 
                    print >>f_consts, ","
 
 paul@126    495 
                else:
 
 paul@126    496 
                    first = False
 
 paul@132    497 
                f_consts.write("    %s = %d" % (encode_symbol(pos_prefix, attrname), i))
 
 paul@126    498 
        print >>f_consts, "\n    };"
 
 paul@126    499 
 
 paul@126    500 
    def write_table(self, f_decls, f_defs, table_name, structure_size, table):
 
 paul@126    501 
 
 paul@126    502 
        """
 
 paul@126    503 
        Write the declarations to 'f_decls' and definitions to 'f_defs' for
 
 paul@126    504 
        the object having the given 'table_name' and the given 'structure_size',
 
 paul@126    505 
        with 'table' details used to populate the definition.
 
 paul@126    506 
        """
 
 paul@126    507 
 
 paul@126    508 
        print >>f_decls, "extern const __table %s;\n" % table_name
 
 paul@126    509 
 
 paul@126    510 
        # Write the corresponding definition.
 
 paul@126    511 
 
 paul@126    512 
        print >>f_defs, "const __table %s = {\n    %s,\n    {\n        %s\n        }\n    };\n" % (
 
 paul@126    513 
            table_name, structure_size,
 
 paul@126    514 
            ",\n        ".join(table))
 
 paul@126    515 
 
 paul@126    516 
    def write_parameter_table(self, f_decls, f_defs, table_name, structure_size, table):
 
 paul@126    517 
 
 paul@126    518 
        """
 
 paul@126    519 
        Write the declarations to 'f_decls' and definitions to 'f_defs' for
 
 paul@126    520 
        the object having the given 'table_name' and the given 'structure_size',
 
 paul@126    521 
        with 'table' details used to populate the definition.
 
 paul@126    522 
        """
 
 paul@126    523 
 
 paul@126    524 
        print >>f_decls, "extern const __ptable %s;\n" % table_name
 
 paul@126    525 
 
 paul@126    526 
        # Write the corresponding definition.
 
 paul@126    527 
 
 paul@126    528 
        print >>f_defs, "const __ptable %s = {\n    %s,\n    {\n        %s\n        }\n    };\n" % (
 
 paul@126    529 
            table_name, structure_size,
 
 paul@126    530 
            ",\n        ".join([("{%s, %s}" % t) for t in table]))
 
 paul@126    531 
 
 paul@136    532 
    def write_instance_structure(self, f_decls, path, structure_size):
 
 paul@126    533 
 
 paul@126    534 
        """
 
 paul@136    535 
        Write a declaration to 'f_decls' for the object having the given 'path'
 
 paul@136    536 
        and the given 'structure_size'.
 
 paul@126    537 
        """
 
 paul@126    538 
 
 paul@126    539 
        # Write an instance-specific type definition for instances of classes.
 
 paul@126    540 
        # See: templates/types.h
 
 paul@126    541 
 
 paul@126    542 
        print >>f_decls, """\
 
 paul@126    543 
typedef struct {
 
 paul@126    544 
    const __table * table;
 
 paul@126    545 
    unsigned int pos;
 
 paul@126    546 
    __attr attrs[%s];
 
 paul@126    547 
} %s;
 
 paul@136    548 
""" % (structure_size, encode_symbol("obj", path))
 
 paul@136    549 
 
 paul@211    550 
    def write_structure(self, f_decls, f_defs, structure_name, table_name, structure, path=None):
 
 paul@126    551 
 
 paul@136    552 
        """
 
 paul@136    553 
        Write the declarations to 'f_decls' and definitions to 'f_defs' for
 
 paul@136    554 
        the object having the given 'structure_name', the given 'table_name',
 
 paul@211    555 
        and the given 'structure' details used to populate the definition.
 
 paul@136    556 
        """
 
 paul@126    557 
 
 paul@136    558 
        if f_decls:
 
 paul@136    559 
            print >>f_decls, "extern __obj %s;\n" % encode_path(structure_name)
 
 paul@136    560 
 
 paul@136    561 
        is_class = path and self.importer.get_object(path).has_kind("<class>")
 
 paul@132    562 
        pos = is_class and encode_symbol("pos", encode_type_attribute(path)) or "0"
 
 paul@132    563 
 
 paul@132    564 
        print >>f_defs, """\
 
 paul@132    565 
__obj %s = {
 
 paul@132    566 
    &%s,
 
 paul@132    567 
    %s,
 
 paul@132    568 
    {
 
 paul@132    569 
        %s
 
 paul@132    570 
    }};
 
 paul@132    571 
""" % (
 
 paul@136    572 
            encode_path(structure_name), table_name, pos,
 
 paul@126    573 
            ",\n        ".join(structure))
 
 paul@126    574 
 
 paul@132    575 
    def get_argument_limits(self, path):
 
 paul@126    576 
 
 paul@132    577 
        """
 
 paul@132    578 
        Return the argument minimum and maximum for the callable at 'path',
 
 paul@132    579 
        adding an argument position for a universal context.
 
 paul@132    580 
        """
 
 paul@132    581 
 
 paul@126    582 
        parameters = self.importer.function_parameters[path]
 
 paul@126    583 
        defaults = self.importer.function_defaults.get(path)
 
 paul@132    584 
        num_parameters = len(parameters) + 1
 
 paul@132    585 
        return num_parameters - (defaults and len(defaults) or 0), num_parameters
 
 paul@126    586 
 
 paul@126    587 
    def get_attribute_names(self, indexes):
 
 paul@126    588 
 
 paul@126    589 
        """
 
 paul@126    590 
        Given a list of attribute table 'indexes', return a list of attribute
 
 paul@126    591 
        names.
 
 paul@126    592 
        """
 
 paul@126    593 
 
 paul@126    594 
        all_attrnames = self.optimiser.all_attrnames
 
 paul@126    595 
        attrnames = []
 
 paul@126    596 
        for i in indexes:
 
 paul@126    597 
            if i is None:
 
 paul@126    598 
                attrnames.append(None)
 
 paul@126    599 
            else:
 
 paul@126    600 
                attrnames.append(all_attrnames[i])
 
 paul@126    601 
        return attrnames
 
 paul@126    602 
 
 paul@126    603 
    def get_static_attributes(self, kind, name, attrnames):
 
 paul@126    604 
 
 paul@126    605 
        """
 
 paul@126    606 
        Return a mapping of attribute names to paths for attributes belonging
 
 paul@126    607 
        to objects of the given 'kind' (being "<class>" or "<module>") with
 
 paul@126    608 
        the given 'name' and supporting the given 'attrnames'.
 
 paul@126    609 
        """
 
 paul@126    610 
 
 paul@126    611 
        attrs = {}
 
 paul@126    612 
 
 paul@126    613 
        for attrname in attrnames:
 
 paul@126    614 
            if attrname is None:
 
 paul@126    615 
                continue
 
 paul@126    616 
            if kind == "<class>":
 
 paul@126    617 
                path = self.importer.all_class_attrs[name][attrname]
 
 paul@126    618 
            elif kind == "<module>":
 
 paul@126    619 
                path = "%s.%s" % (name, attrname)
 
 paul@126    620 
            else:
 
 paul@126    621 
                continue
 
 paul@126    622 
 
 paul@126    623 
            # The module may be hidden.
 
 paul@126    624 
 
 paul@126    625 
            attr = self.importer.get_object(path)
 
 paul@126    626 
            if not attr:
 
 paul@126    627 
                module = self.importer.hidden.get(path)
 
 paul@126    628 
                if module:
 
 paul@126    629 
                    attr = Reference(module.name, "<module>")
 
 paul@126    630 
            attrs[attrname] = attr
 
 paul@126    631 
 
 paul@126    632 
        return attrs
 
 paul@126    633 
 
 paul@126    634 
    def get_instance_attributes(self, name, attrnames):
 
 paul@126    635 
 
 paul@126    636 
        """
 
 paul@126    637 
        Return a mapping of attribute names to references for attributes
 
 paul@126    638 
        belonging to instances of the class with the given 'name', where the
 
 paul@126    639 
        given 'attrnames' are supported.
 
 paul@126    640 
        """
 
 paul@126    641 
 
 paul@126    642 
        consts = self.importer.all_instance_attr_constants[name]
 
 paul@126    643 
        attrs = {}
 
 paul@126    644 
        for attrname in attrnames:
 
 paul@126    645 
            if attrname is None:
 
 paul@126    646 
                continue
 
 paul@126    647 
            const = consts.get(attrname)
 
 paul@126    648 
            attrs[attrname] = const or Reference("<var>", "%s.%s" % (name, attrname))
 
 paul@126    649 
        return attrs
 
 paul@126    650 
 
 paul@126    651 
    def populate_table(self, key, table):
 
 paul@126    652 
 
 paul@126    653 
        """
 
 paul@126    654 
        Traverse the attributes in the determined order for the structure having
 
 paul@126    655 
        the given 'key', adding entries to the attribute 'table'.
 
 paul@126    656 
        """
 
 paul@126    657 
 
 paul@126    658 
        for attrname in self.optimiser.structures[key]:
 
 paul@126    659 
 
 paul@126    660 
            # Handle gaps in the structure.
 
 paul@126    661 
 
 paul@126    662 
            if attrname is None:
 
 paul@126    663 
                table.append("0")
 
 paul@126    664 
            else:
 
 paul@126    665 
                table.append(encode_symbol("code", attrname))
 
 paul@126    666 
 
 paul@126    667 
    def populate_parameter_table(self, key, table):
 
 paul@126    668 
 
 paul@126    669 
        """
 
 paul@126    670 
        Traverse the parameters in the determined order for the structure having
 
 paul@126    671 
        the given 'key', adding entries to the attribute 'table'.
 
 paul@126    672 
        """
 
 paul@126    673 
 
 paul@126    674 
        for value in self.optimiser.parameters[key]:
 
 paul@126    675 
 
 paul@126    676 
            # Handle gaps in the structure.
 
 paul@126    677 
 
 paul@126    678 
            if value is None:
 
 paul@126    679 
                table.append(("0", "0"))
 
 paul@126    680 
            else:
 
 paul@126    681 
                name, pos = value
 
 paul@126    682 
                table.append((encode_symbol("pcode", name), pos))
 
 paul@126    683 
 
 paul@126    684 
    def populate_function(self, path, function_instance_attrs, unbound=False):
 
 paul@126    685 
 
 paul@126    686 
        """
 
 paul@126    687 
        Populate a structure for the function with the given 'path'. The given
 
 paul@126    688 
        'attrs' provide the instance attributes, and if 'unbound' is set to a
 
 paul@126    689 
        true value, an unbound method structure is produced (as opposed to a
 
 paul@126    690 
        callable bound method structure).
 
 paul@126    691 
        """
 
 paul@126    692 
 
 paul@126    693 
        structure = []
 
 paul@174    694 
        self.populate_structure(Reference("<function>", path), function_instance_attrs, "<instance>", structure, unbound)
 
 paul@126    695 
 
 paul@126    696 
        # Append default members.
 
 paul@126    697 
 
 paul@126    698 
        self.append_defaults(path, structure)
 
 paul@126    699 
        return structure
 
 paul@126    700 
 
 paul@126    701 
    def populate_structure(self, ref, attrs, kind, structure, unbound=False):
 
 paul@126    702 
 
 paul@126    703 
        """
 
 paul@126    704 
        Traverse the attributes in the determined order for the structure having
 
 paul@126    705 
        the given 'ref' whose members are provided by the 'attrs' mapping, in a
 
 paul@126    706 
        structure of the given 'kind', adding entries to the object 'structure'.
 
 paul@126    707 
        If 'unbound' is set to a true value, an unbound method function pointer
 
 paul@126    708 
        will be employed, with a reference to the bound method incorporated into
 
 paul@126    709 
        the special __fn__ attribute.
 
 paul@126    710 
        """
 
 paul@126    711 
 
 paul@174    712 
        # Populate function instance structures for functions.
 
 paul@174    713 
 
 paul@174    714 
        if ref.has_kind("<function>"):
 
 paul@174    715 
            origin = self.function_type
 
 paul@174    716 
            structure_ref = Reference("<instance>", self.function_type)
 
 paul@174    717 
 
 paul@174    718 
        # Otherwise, just populate the appropriate structures.
 
 paul@126    719 
 
 paul@174    720 
        else:
 
 paul@174    721 
            origin = ref.get_origin()
 
 paul@174    722 
            structure_ref = ref
 
 paul@174    723 
 
 paul@174    724 
        # Refer to instantiator function tables for classes, specific function
 
 paul@174    725 
        # tables for individual functions.
 
 paul@174    726 
 
 paul@174    727 
        ptable = encode_tablename("<function>", ref.get_origin())
 
 paul@174    728 
 
 paul@174    729 
        for attrname in self.optimiser.structures[structure_ref]:
 
 paul@126    730 
 
 paul@126    731 
            # Handle gaps in the structure.
 
 paul@126    732 
 
 paul@126    733 
            if attrname is None:
 
 paul@126    734 
                structure.append("{0, 0}")
 
 paul@126    735 
 
 paul@126    736 
            # Handle non-constant and constant members.
 
 paul@126    737 
 
 paul@126    738 
            else:
 
 paul@126    739 
                attr = attrs[attrname]
 
 paul@126    740 
 
 paul@136    741 
                # Special function pointer member.
 
 paul@136    742 
 
 paul@126    743 
                if attrname == "__fn__":
 
 paul@126    744 
 
 paul@126    745 
                    # Provide bound method references and the unbound function
 
 paul@126    746 
                    # pointer if populating methods in a class.
 
 paul@126    747 
 
 paul@126    748 
                    bound_attr = None
 
 paul@126    749 
 
 paul@126    750 
                    # Classes offer instantiators.
 
 paul@126    751 
 
 paul@126    752 
                    if kind == "<class>":
 
 paul@126    753 
                        attr = encode_instantiator_pointer(attr)
 
 paul@126    754 
 
 paul@126    755 
                    # Methods offers references to bound versions and an unbound
 
 paul@126    756 
                    # method function.
 
 paul@126    757 
 
 paul@126    758 
                    elif unbound:
 
 paul@126    759 
                        bound_attr = encode_bound_reference(attr)
 
 paul@126    760 
                        attr = "__unbound_method"
 
 paul@126    761 
 
 paul@126    762 
                    # Other functions just offer function pointers.
 
 paul@126    763 
 
 paul@126    764 
                    else:
 
 paul@126    765 
                        attr = encode_function_pointer(attr)
 
 paul@126    766 
 
 paul@132    767 
                    structure.append("{%s, .fn=%s}" % (bound_attr and ".b=&%s" % bound_attr or "0", attr))
 
 paul@126    768 
                    continue
 
 paul@126    769 
 
 paul@136    770 
                # Special argument specification member.
 
 paul@136    771 
 
 paul@126    772 
                elif attrname == "__args__":
 
 paul@174    773 
                    structure.append("{.min=%s, .ptable=&%s}" % (attr, ptable))
 
 paul@126    774 
                    continue
 
 paul@126    775 
 
 paul@136    776 
                # Special internal data member.
 
 paul@136    777 
 
 paul@136    778 
                elif attrname == "__data__":
 
 paul@136    779 
                    structure.append("{0, .%s=%s}" % (encode_literal_constant_member(attr),
 
 paul@136    780 
                                                      encode_literal_constant_value(attr)))
 
 paul@136    781 
                    continue
 
 paul@136    782 
 
 paul@126    783 
                structure.append(self.encode_member(origin, attrname, attr, kind))
 
 paul@126    784 
 
 paul@126    785 
    def encode_member(self, path, name, ref, structure_type):
 
 paul@126    786 
 
 paul@126    787 
        """
 
 paul@126    788 
        Encode within the structure provided by 'path', the member whose 'name'
 
 paul@126    789 
        provides 'ref', within the given 'structure_type'.
 
 paul@126    790 
        """
 
 paul@126    791 
 
 paul@126    792 
        kind = ref.get_kind()
 
 paul@126    793 
        origin = ref.get_origin()
 
 paul@126    794 
 
 paul@126    795 
        # References to constant literals.
 
 paul@126    796 
 
 paul@126    797 
        if kind == "<instance>":
 
 paul@126    798 
            attr_path = "%s.%s" % (path, name)
 
 paul@126    799 
 
 paul@126    800 
            # Obtain a constant value directly assigned to the attribute.
 
 paul@126    801 
 
 paul@126    802 
            if self.optimiser.constant_numbers.has_key(attr_path):
 
 paul@126    803 
                constant_number = self.optimiser.constant_numbers[attr_path]
 
 paul@126    804 
                constant_value = "const%d" % constant_number
 
 paul@126    805 
                return "{&%s, &%s} /* %s */" % (constant_value, constant_value, name)
 
 paul@126    806 
 
 paul@136    807 
        # Predefined constant references.
 
 paul@136    808 
 
 paul@136    809 
        if (path, name) in self.predefined_constant_members:
 
 paul@136    810 
            attr_path = encode_predefined_reference("%s.%s" % (path, name))
 
 paul@136    811 
            return "{&%s, &%s} /* %s */" % (attr_path, attr_path, name)
 
 paul@136    812 
 
 paul@126    813 
        # General undetermined members.
 
 paul@126    814 
 
 paul@126    815 
        if kind in ("<var>", "<instance>"):
 
 paul@126    816 
            return "{0, 0} /* %s */" % name
 
 paul@126    817 
 
 paul@126    818 
        # Set the context depending on the kind of attribute.
 
 paul@139    819 
        # For methods:          {&<parent>, &<attr>}
 
 paul@126    820 
        # For other attributes: {&<attr>, &<attr>}
 
 paul@126    821 
 
 paul@126    822 
        else:
 
 paul@139    823 
            if kind == "<function>" and structure_type == "<class>":
 
 paul@139    824 
                parent = origin.rsplit(".", 1)[0]
 
 paul@139    825 
                context = "&%s" % encode_path(parent)
 
 paul@139    826 
            elif kind == "<instance>":
 
 paul@139    827 
                context = "&%s" % encode_path(origin)
 
 paul@139    828 
            else:
 
 paul@139    829 
                context = "0"
 
 paul@126    830 
            return "{%s, &%s}" % (context, encode_path(origin))
 
 paul@126    831 
 
 paul@126    832 
    def append_defaults(self, path, structure):
 
 paul@126    833 
 
 paul@126    834 
        """
 
 paul@126    835 
        For the given 'path', append default parameter members to the given
 
 paul@126    836 
        'structure'.
 
 paul@126    837 
        """
 
 paul@126    838 
 
 paul@126    839 
        for name, default in self.importer.function_defaults.get(path):
 
 paul@126    840 
            structure.append(self.encode_member(path, name, default, "<instance>"))
 
 paul@126    841 
 
 paul@159    842 
    def write_instantiator(self, f_code, f_signatures, path, init_ref):
 
 paul@126    843 
 
 paul@126    844 
        """
 
 paul@159    845 
        Write an instantiator to 'f_code', with a signature to 'f_signatures',
 
 paul@159    846 
        for instances of the class with the given 'path', with 'init_ref' as the
 
 paul@159    847 
        initialiser function reference.
 
 paul@126    848 
 
 paul@126    849 
        NOTE: This also needs to initialise any __fn__ and __args__ members
 
 paul@126    850 
        NOTE: where __call__ is provided by the class.
 
 paul@126    851 
        """
 
 paul@126    852 
 
 paul@132    853 
        parameters = self.importer.function_parameters[init_ref.get_origin()]
 
 paul@126    854 
 
 paul@126    855 
        print >>f_code, """\
 
 paul@132    856 
__attr %s(__attr __args[])
 
 paul@126    857 
{
 
 paul@159    858 
    /* Allocate the structure. */
 
 paul@132    859 
    __args[0] = __new(&%s, &%s, sizeof(%s));
 
 paul@159    860 
 
 paul@159    861 
    /* Call the initialiser. */
 
 paul@146    862 
    %s(__args);
 
 paul@159    863 
 
 paul@159    864 
    /* Return the allocated object details. */
 
 paul@132    865 
    return __args[0];
 
 paul@126    866 
}
 
 paul@126    867 
""" % (
 
 paul@126    868 
    encode_instantiator_pointer(path),
 
 paul@150    869 
    encode_tablename("<instance>", path),
 
 paul@150    870 
    encode_path(path),
 
 paul@150    871 
    encode_symbol("obj", path),
 
 paul@126    872 
    encode_function_pointer(init_ref.get_origin())
 
 paul@126    873 
    )
 
 paul@126    874 
 
 paul@159    875 
        print >>f_signatures, "__attr %s(__attr[]);" % encode_instantiator_pointer(path)
 
 paul@159    876 
 
 paul@159    877 
        # Write additional literal instantiators. These do not call the
 
 paul@159    878 
        # initialisers but instead populate the structures directly.
 
 paul@159    879 
 
 paul@159    880 
        if path in self.literal_instantiator_types:
 
 paul@159    881 
            print >>f_code, """\
 
 paul@159    882 
__attr %s(__attr __args[], unsigned int number)
 
 paul@159    883 
{
 
 paul@159    884 
    __attr data;
 
 paul@159    885 
 
 paul@159    886 
    /* Allocate the structure. */
 
 paul@159    887 
    __args[0] = __new(&%s, &%s, sizeof(%s));
 
 paul@159    888 
 
 paul@159    889 
    /* Allocate a structure for the data. */
 
 paul@159    890 
    data = __newdata(__args, number);
 
 paul@159    891 
 
 paul@159    892 
    /* Store a reference to the data in the object's __data__ attribute. */
 
 paul@159    893 
    __store_via_object(__args[0].value, %s, data);
 
 paul@159    894 
 
 paul@159    895 
    /* Return the allocated object details. */
 
 paul@159    896 
    return __args[0];
 
 paul@159    897 
}
 
 paul@159    898 
""" % (
 
 paul@159    899 
    encode_literal_instantiator(path),
 
 paul@159    900 
    encode_tablename("<instance>", path),
 
 paul@159    901 
    encode_path(path),
 
 paul@159    902 
    encode_symbol("obj", path),
 
 paul@159    903 
    encode_symbol("pos", "__data__")
 
 paul@159    904 
    )
 
 paul@159    905 
 
 paul@159    906 
        print >>f_signatures, "__attr %s(__attr[], unsigned int);" % encode_literal_instantiator(path)
 
 paul@159    907 
 
 paul@146    908 
    def write_main_program(self, f_code, f_signatures):
 
 paul@146    909 
 
 paul@146    910 
        """
 
 paul@146    911 
        Write the main program to 'f_code', invoking the program's modules. Also
 
 paul@146    912 
        write declarations for module main functions to 'f_signatures'.
 
 paul@146    913 
        """
 
 paul@146    914 
 
 paul@146    915 
        print >>f_code, """\
 
 paul@146    916 
int main(int argc, char *argv[])
 
 paul@159    917 
{
 
 paul@190    918 
    __exc __tmp_exc;
 
 paul@159    919 
    __Try
 
 paul@159    920 
    {"""
 
 paul@146    921 
 
 paul@186    922 
        for name in self.importer.order_modules():
 
 paul@146    923 
            function_name = "__main_%s" % encode_path(name)
 
 paul@146    924 
            print >>f_signatures, "void %s();" % function_name
 
 paul@146    925 
 
 paul@161    926 
            # Omit the native module.
 
 paul@146    927 
 
 paul@186    928 
            if name != "native":
 
 paul@146    929 
                print >>f_code, """\
 
 paul@165    930 
        %s();""" % function_name
 
 paul@146    931 
 
 paul@146    932 
        print >>f_code, """\
 
 paul@159    933 
        return 0;
 
 paul@159    934 
    }
 
 paul@190    935 
    __Catch(__tmp_exc)
 
 paul@159    936 
    {
 
 paul@159    937 
        fprintf(stderr, "Program terminated due to exception.\\n");
 
 paul@159    938 
        return 1;
 
 paul@159    939 
    }
 
 paul@146    940 
}
 
 paul@146    941 
"""
 
 paul@146    942 
 
 paul@126    943 
# vim: tabstop=4 expandtab shiftwidth=4