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dtoc: Split source-code scanning to a separate file

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Before expanding the scanning features any more, move this into a separate
file. This will make it easier to maintain in the future. In particular,
it reduces the size of dtb_platdata.py and allows us to add tests
specifically for scanning, without going through that file.

The pieces moved are the Driver class, the scanning code and the various
naming functions, since they mostly depend on the scanning results.

So far there is are no separate tests for src_scan. These will be added
as new functionality appears.

This introduces no functional change.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-12-28 20:35:06 -07:00
parent d960f0db28
commit a542a70c22
3 changed files with 204 additions and 169 deletions
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174
tools/dtoc/dtb_platdata.py
View file

@ -22,6 +22,8 @@ import sys
from dtoc import fdt
from dtoc import fdt_util
from dtoc import src_scan
from dtoc.src_scan import conv_name_to_c
# When we see these properties we ignore them - i.e. do not create a structure
# member
@ -76,39 +78,6 @@ PhandleInfo = collections.namedtuple('PhandleInfo', ['max_args', 'args'])
PhandleLink = collections.namedtuple('PhandleLink', ['var_node', 'dev_name'])
class Driver:
"""Information about a driver in U-Boot
Attributes:
name: Name of driver. For U_BOOT_DRIVER(x) this is 'x'
"""
def __init__(self, name):
self.name = name
def __eq__(self, other):
return self.name == other.name
def __repr__(self):
return "Driver(name='%s')" % self.name
def conv_name_to_c(name):
"""Convert a device-tree name to a C identifier
This uses multiple replace() calls instead of re.sub() since it is faster
(400ms for 1m calls versus 1000ms for the 're' version).
Args:
name (str): Name to convert
Return:
str: String containing the C version of this name
"""
new = name.replace('@', '_at_')
new = new.replace('-', '_')
new = new.replace(',', '_')
new = new.replace('.', '_')
return new
def tab_to(num_tabs, line):
"""Append tabs to a line of text to reach a tab stop.
@ -154,19 +123,6 @@ def get_value(ftype, value):
val = '%#x' % value
return val
def get_compat_name(node):
"""Get the node's list of compatible string as a C identifiers
Args:
node (fdt.Node): Node object to check
Return:
list of str: List of C identifiers for all the compatible strings
"""
compat = node.props['compatible'].value
if not isinstance(compat, list):
compat = [compat]
return [conv_name_to_c(c) for c in compat]
class DtbPlatdata():
"""Provide a means to convert device tree binary data to platform data
@ -176,22 +132,15 @@ class DtbPlatdata():
code is not affordable.
Properties:
_scan: Scan object, for scanning and reporting on useful information
from the U-Boot source code
_fdt: Fdt object, referencing the device tree
_dtb_fname: Filename of the input device tree binary file
_valid_nodes: A list of Node object with compatible strings. The list
is ordered by conv_name_to_c(node.name)
_include_disabled: true to include nodes marked status = "disabled"
_outfile: The current output file (sys.stdout or a real file)
_warning_disabled: true to disable warnings about driver names not found
_lines: Stashed list of output lines for outputting in the future
_drivers: Dict of valid driver names found in drivers/
key: Driver name
value: Driver for that driver
_driver_aliases: Dict that holds aliases for driver names
key: Driver alias declared with
DM_DRIVER_ALIAS(driver_alias, driver_name)
value: Driver name declared with U_BOOT_DRIVER(driver_name)
_drivers_additional: List of additional drivers to use during scanning
_dirname: Directory to hold output files, or None for none (all files
go to stdout)
_struct_data (dict): OrderedDict of dtplat structures to output
@ -201,58 +150,18 @@ class DtbPlatdata():
value: Prop object with field information
_basedir (str): Base directory of source tree
"""
def __init__(self, dtb_fname, include_disabled, warning_disabled,
drivers_additional=None):
def __init__(self, scan, dtb_fname, include_disabled):
self._scan = scan
self._fdt = None
self._dtb_fname = dtb_fname
self._valid_nodes = None
self._include_disabled = include_disabled
self._outfile = None
self._warning_disabled = warning_disabled
self._lines = []
self._drivers = {}
self._driver_aliases = {}
self._drivers_additional = drivers_additional or []
self._dirnames = [None] * len(Ftype)
self._struct_data = collections.OrderedDict()
self._basedir = None
def get_normalized_compat_name(self, node):
"""Get a node's normalized compat name
Returns a valid driver name by retrieving node's list of compatible
string as a C identifier and performing a check against _drivers
and a lookup in driver_aliases printing a warning in case of failure.
Args:
node (Node): Node object to check
Return:
Tuple:
Driver name associated with the first compatible string
List of C identifiers for all the other compatible strings
(possibly empty)
In case of no match found, the return will be the same as
get_compat_name()
"""
compat_list_c = get_compat_name(node)
for compat_c in compat_list_c:
if not compat_c in self._drivers.keys():
compat_c = self._driver_aliases.get(compat_c)
if not compat_c:
continue
aliases_c = compat_list_c
if compat_c in aliases_c:
aliases_c.remove(compat_c)
return compat_c, aliases_c
if not self._warning_disabled:
print('WARNING: the driver %s was not found in the driver list'
% (compat_list_c[0]))
return compat_list_c[0], compat_list_c[1:]
def setup_output_dirs(self, output_dirs):
"""Set up the output directories
@ -407,65 +316,6 @@ class DtbPlatdata():
return PhandleInfo(max_args, args)
return None
def scan_driver(self, fname):
"""Scan a driver file to build a list of driver names and aliases
This procedure will populate self._drivers and self._driver_aliases
Args
fname: Driver filename to scan
"""
with open(fname, encoding='utf-8') as inf:
try:
buff = inf.read()
except UnicodeDecodeError:
# This seems to happen on older Python versions
print("Skipping file '%s' due to unicode error" % fname)
return
# The following re will search for driver names declared as
# U_BOOT_DRIVER(driver_name)
drivers = re.findall(r'U_BOOT_DRIVER\((.*)\)', buff)
for driver in drivers:
self._drivers[driver] = Driver(driver)
# The following re will search for driver aliases declared as
# DM_DRIVER_ALIAS(alias, driver_name)
driver_aliases = re.findall(
r'DM_DRIVER_ALIAS\(\s*(\w+)\s*,\s*(\w+)\s*\)',
buff)
for alias in driver_aliases: # pragma: no cover
if len(alias) != 2:
continue
self._driver_aliases[alias[1]] = alias[0]
def scan_drivers(self, basedir=None):
"""Scan the driver folders to build a list of driver names and aliases
This procedure will populate self._drivers and self._driver_aliases
"""
if not basedir:
basedir = sys.argv[0].replace('tools/dtoc/dtoc', '')
if basedir == '':
basedir = './'
self._basedir = basedir
for (dirpath, _, filenames) in os.walk(basedir):
for fname in filenames:
if not fname.endswith('.c'):
continue
self.scan_driver(dirpath + '/' + fname)
for fname in self._drivers_additional:
if not isinstance(fname, str) or len(fname) == 0:
continue
if fname[0] == '/':
self.scan_driver(fname)
else:
self.scan_driver(basedir + '/' + fname)
def scan_dtb(self):
"""Scan the device tree to obtain a tree of nodes and properties
@ -584,7 +434,7 @@ class DtbPlatdata():
"""
structs = self._struct_data
for node in self._valid_nodes:
node_name, _ = self.get_normalized_compat_name(node)
node_name, _ = self._scan.get_normalized_compat_name(node)
fields = {}
# Get a list of all the valid properties in this node.
@ -607,7 +457,7 @@ class DtbPlatdata():
structs[node_name] = fields
for node in self._valid_nodes:
node_name, _ = self.get_normalized_compat_name(node)
node_name, _ = self._scan.get_normalized_compat_name(node)
struct = structs[node_name]
for name, prop in node.props.items():
if name not in PROP_IGNORE_LIST and name[0] != '#':
@ -772,7 +622,7 @@ class DtbPlatdata():
Args:
node (fdt.Node): node to output
"""
struct_name, _ = self.get_normalized_compat_name(node)
struct_name, _ = self._scan.get_normalized_compat_name(node)
var_name = conv_name_to_c(node.name)
self.buf('/* Node %s index %d */\n' % (node.path, node.idx))
@ -845,9 +695,9 @@ def run_steps(args, dtb_file, include_disabled, output, output_dirs,
if output and output_dirs and any(output_dirs):
raise ValueError('Must specify either output or output_dirs, not both')
plat = DtbPlatdata(dtb_file, include_disabled, warning_disabled,
drivers_additional)
plat.scan_drivers(basedir)
scan = src_scan.Scanner(basedir, drivers_additional, warning_disabled)
plat = DtbPlatdata(scan, dtb_file, include_disabled)
scan.scan_drivers()
plat.scan_dtb()
plat.scan_tree()
plat.scan_reg_sizes()

185
tools/dtoc/src_scan.py Normal file
View file

@ -0,0 +1,185 @@
#!/usr/bin/python
# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (C) 2017 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
"""Scanning of U-Boot source for drivers and structs
This scans the source tree to find out things about all instances of
U_BOOT_DRIVER(), UCLASS_DRIVER and all struct declarations in header files.
See doc/driver-model/of-plat.rst for more informaiton
"""
import os
import re
import sys
def conv_name_to_c(name):
"""Convert a device-tree name to a C identifier
This uses multiple replace() calls instead of re.sub() since it is faster
(400ms for 1m calls versus 1000ms for the 're' version).
Args:
name (str): Name to convert
Return:
str: String containing the C version of this name
"""
new = name.replace('@', '_at_')
new = new.replace('-', '_')
new = new.replace(',', '_')
new = new.replace('.', '_')
return new
def get_compat_name(node):
"""Get the node's list of compatible string as a C identifiers
Args:
node (fdt.Node): Node object to check
Return:
list of str: List of C identifiers for all the compatible strings
"""
compat = node.props['compatible'].value
if not isinstance(compat, list):
compat = [compat]
return [conv_name_to_c(c) for c in compat]
class Driver:
"""Information about a driver in U-Boot
Attributes:
name: Name of driver. For U_BOOT_DRIVER(x) this is 'x'
"""
def __init__(self, name):
self.name = name
def __eq__(self, other):
return self.name == other.name
def __repr__(self):
return "Driver(name='%s')" % self.name
class Scanner:
"""Scanning of the U-Boot source tree
Properties:
_basedir (str): Base directory of U-Boot source code. Defaults to the
grandparent of this file's directory
_drivers: Dict of valid driver names found in drivers/
key: Driver name
value: Driver for that driver
_driver_aliases: Dict that holds aliases for driver names
key: Driver alias declared with
DM_DRIVER_ALIAS(driver_alias, driver_name)
value: Driver name declared with U_BOOT_DRIVER(driver_name)
_drivers_additional (list or str): List of additional drivers to use
during scanning
_warning_disabled: true to disable warnings about driver names not found
"""
def __init__(self, basedir, drivers_additional, warning_disabled):
"""Set up a new Scanner
"""
if not basedir:
basedir = sys.argv[0].replace('tools/dtoc/dtoc', '')
if basedir == '':
basedir = './'
self._basedir = basedir
self._drivers = {}
self._driver_aliases = {}
self._drivers_additional = drivers_additional or []
self._warning_disabled = warning_disabled
def get_normalized_compat_name(self, node):
"""Get a node's normalized compat name
Returns a valid driver name by retrieving node's list of compatible
string as a C identifier and performing a check against _drivers
and a lookup in driver_aliases printing a warning in case of failure.
Args:
node (Node): Node object to check
Return:
Tuple:
Driver name associated with the first compatible string
List of C identifiers for all the other compatible strings
(possibly empty)
In case of no match found, the return will be the same as
get_compat_name()
"""
compat_list_c = get_compat_name(node)
for compat_c in compat_list_c:
if not compat_c in self._drivers.keys():
compat_c = self._driver_aliases.get(compat_c)
if not compat_c:
continue
aliases_c = compat_list_c
if compat_c in aliases_c:
aliases_c.remove(compat_c)
return compat_c, aliases_c
if not self._warning_disabled:
print('WARNING: the driver %s was not found in the driver list'
% (compat_list_c[0]))
return compat_list_c[0], compat_list_c[1:]
def scan_driver(self, fname):
"""Scan a driver file to build a list of driver names and aliases
This procedure will populate self._drivers and self._driver_aliases
Args
fname: Driver filename to scan
"""
with open(fname, encoding='utf-8') as inf:
try:
buff = inf.read()
except UnicodeDecodeError:
# This seems to happen on older Python versions
print("Skipping file '%s' due to unicode error" % fname)
return
# The following re will search for driver names declared as
# U_BOOT_DRIVER(driver_name)
drivers = re.findall(r'U_BOOT_DRIVER\((.*)\)', buff)
for driver in drivers:
self._drivers[driver] = Driver(driver)
# The following re will search for driver aliases declared as
# DM_DRIVER_ALIAS(alias, driver_name)
driver_aliases = re.findall(
r'DM_DRIVER_ALIAS\(\s*(\w+)\s*,\s*(\w+)\s*\)',
buff)
for alias in driver_aliases: # pragma: no cover
if len(alias) != 2:
continue
self._driver_aliases[alias[1]] = alias[0]
def scan_drivers(self):
"""Scan the driver folders to build a list of driver names and aliases
This procedure will populate self._drivers and self._driver_aliases
"""
for (dirpath, _, filenames) in os.walk(self._basedir):
for fname in filenames:
if not fname.endswith('.c'):
continue
self.scan_driver(dirpath + '/' + fname)
for fname in self._drivers_additional:
if not isinstance(fname, str) or len(fname) == 0:
continue
if fname[0] == '/':
self.scan_driver(fname)
else:
self.scan_driver(self._basedir + '/' + fname)

14
tools/dtoc/test_dtoc.py
View file

@ -18,13 +18,14 @@ import tempfile
import unittest
from unittest import mock
from dtb_platdata import conv_name_to_c
from dtb_platdata import get_compat_name
from dtb_platdata import get_value
from dtb_platdata import tab_to
from dtoc import dtb_platdata
from dtoc import fdt
from dtoc import fdt_util
from dtoc import src_scan
from dtoc.src_scan import conv_name_to_c
from dtoc.src_scan import get_compat_name
from patman import test_util
from patman import tools
@ -933,9 +934,9 @@ U_BOOT_DRVINFO(spl_test2) = {
def test_driver(self):
"""Test the Driver class"""
drv1 = dtb_platdata.Driver('fred')
drv2 = dtb_platdata.Driver('mary')
drv3 = dtb_platdata.Driver('fred')
drv1 = src_scan.Driver('fred')
drv2 = src_scan.Driver('mary')
drv3 = src_scan.Driver('fred')
self.assertEqual("Driver(name='fred')", str(drv1))
self.assertEqual(drv1, drv3)
self.assertNotEqual(drv1, drv2)
@ -989,8 +990,7 @@ U_BOOT_DRVINFO(spl_test2) = {
# Mock out scan_driver and check that it is called with the
# expected files
with mock.patch.object(dtb_platdata.DtbPlatdata, "scan_driver") \
as mocked:
with mock.patch.object(src_scan.Scanner, "scan_driver") as mocked:
dtb_platdata.run_steps(['all'], dtb_file, False, None, [outdir],
True, basedir=indir)
self.assertEqual(2, len(mocked.mock_calls))