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mbedtls/tests/scripts/generate_test_code.py
Dave Rodgman 16799db69a update headers 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
2023-11-02 19:47:20 +00:00

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#!/usr/bin/env python3
# Test suites code generator.
#
# Copyright The Mbed TLS Contributors
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
"""
This script is a key part of Mbed TLS test suites framework. For
understanding the script it is important to understand the
framework. This doc string contains a summary of the framework
and explains the function of this script.
Mbed TLS test suites:
=====================
Scope:
------
The test suites focus on unit testing the crypto primitives and also
include x509 parser tests. Tests can be added to test any Mbed TLS
module. However, the framework is not capable of testing SSL
protocol, since that requires full stack execution and that is best
tested as part of the system test.
Test case definition:
---------------------
Tests are defined in a test_suite_<module>[.<optional sub module>].data
file. A test definition contains:
test name
optional build macro dependencies
test function
test parameters
Test dependencies are build macros that can be specified to indicate
the build config in which the test is valid. For example if a test
depends on a feature that is only enabled by defining a macro. Then
that macro should be specified as a dependency of the test.
Test function is the function that implements the test steps. This
function is specified for different tests that perform same steps
with different parameters.
Test parameters are specified in string form separated by ':'.
Parameters can be of type string, binary data specified as hex
string and integer constants specified as integer, macro or
as an expression. Following is an example test definition:
AES 128 GCM Encrypt and decrypt 8 bytes
depends_on:MBEDTLS_AES_C:MBEDTLS_GCM_C
enc_dec_buf:MBEDTLS_CIPHER_AES_128_GCM:"AES-128-GCM":128:8:-1
Test functions:
---------------
Test functions are coded in C in test_suite_<module>.function files.
Functions file is itself not compilable and contains special
format patterns to specify test suite dependencies, start and end
of functions and function dependencies. Check any existing functions
file for example.
Execution:
----------
Tests are executed in 3 steps:
- Generating test_suite_<module>[.<optional sub module>].c file
for each corresponding .data file.
- Building each source file into executables.
- Running each executable and printing report.
Generating C test source requires more than just the test functions.
Following extras are required:
- Process main()
- Reading .data file and dispatching test cases.
- Platform specific test case execution
- Dependency checking
- Integer expression evaluation
- Test function dispatch
Build dependencies and integer expressions (in the test parameters)
are specified as strings in the .data file. Their run time value is
not known at the generation stage. Hence, they need to be translated
into run time evaluations. This script generates the run time checks
for dependencies and integer expressions.
Similarly, function names have to be translated into function calls.
This script also generates code for function dispatch.
The extra code mentioned here is either generated by this script
or it comes from the input files: helpers file, platform file and
the template file.
Helper file:
------------
Helpers file contains common helper/utility functions and data.
Platform file:
--------------
Platform file contains platform specific setup code and test case
dispatch code. For example, host_test.function reads test data
file from host's file system and dispatches tests.
Template file:
---------
Template file for example main_test.function is a template C file in
which generated code and code from input files is substituted to
generate a compilable C file. It also contains skeleton functions for
dependency checks, expression evaluation and function dispatch. These
functions are populated with checks and return codes by this script.
Template file contains "replacement" fields that are formatted
strings processed by Python string.Template.substitute() method.
This script:
============
Core function of this script is to fill the template file with
code that is generated or read from helpers and platform files.
This script replaces following fields in the template and generates
the test source file:
__MBEDTLS_TEST_TEMPLATE__TEST_COMMON_HELPERS
All common code from helpers.function
is substituted here.
__MBEDTLS_TEST_TEMPLATE__FUNCTIONS_CODE
Test functions are substituted here
from the input test_suit_xyz.function
file. C preprocessor checks are generated
for the build dependencies specified
in the input file. This script also
generates wrappers for the test
functions with code to expand the
string parameters read from the data
file.
__MBEDTLS_TEST_TEMPLATE__EXPRESSION_CODE
This script enumerates the
expressions in the .data file and
generates code to handle enumerated
expression Ids and return the values.
__MBEDTLS_TEST_TEMPLATE__DEP_CHECK_CODE
This script enumerates all
build dependencies and generate
code to handle enumerated build
dependency Id and return status: if
the dependency is defined or not.
__MBEDTLS_TEST_TEMPLATE__DISPATCH_CODE
This script enumerates the functions
specified in the input test data file
and generates the initializer for the
function table in the template
file.
__MBEDTLS_TEST_TEMPLATE__PLATFORM_CODE
Platform specific setup and test
dispatch code.
"""
import os
import re
import sys
import string
import argparse
# Types recognized as signed integer arguments in test functions.
SIGNED_INTEGER_TYPES = frozenset([
'char',
'short',
'short int',
'int',
'int8_t',
'int16_t',
'int32_t',
'int64_t',
'intmax_t',
'long',
'long int',
'long long int',
'mbedtls_mpi_sint',
'psa_status_t',
])
# Types recognized as string arguments in test functions.
STRING_TYPES = frozenset(['char*', 'const char*', 'char const*'])
# Types recognized as hex data arguments in test functions.
DATA_TYPES = frozenset(['data_t*', 'const data_t*', 'data_t const*'])
BEGIN_HEADER_REGEX = r'/\*\s*BEGIN_HEADER\s*\*/'
END_HEADER_REGEX = r'/\*\s*END_HEADER\s*\*/'
BEGIN_SUITE_HELPERS_REGEX = r'/\*\s*BEGIN_SUITE_HELPERS\s*\*/'
END_SUITE_HELPERS_REGEX = r'/\*\s*END_SUITE_HELPERS\s*\*/'
BEGIN_DEP_REGEX = r'BEGIN_DEPENDENCIES'
END_DEP_REGEX = r'END_DEPENDENCIES'
BEGIN_CASE_REGEX = r'/\*\s*BEGIN_CASE\s*(?P<depends_on>.*?)\s*\*/'
END_CASE_REGEX = r'/\*\s*END_CASE\s*\*/'
DEPENDENCY_REGEX = r'depends_on:(?P<dependencies>.*)'
C_IDENTIFIER_REGEX = r'!?[a-z_][a-z0-9_]*'
CONDITION_OPERATOR_REGEX = r'[!=]=|[<>]=?'
# forbid 0ddd which might be accidentally octal or accidentally decimal
CONDITION_VALUE_REGEX = r'[-+]?(0x[0-9a-f]+|0|[1-9][0-9]*)'
CONDITION_REGEX = r'({})(?:\s*({})\s*({}))?$'.format(C_IDENTIFIER_REGEX,
CONDITION_OPERATOR_REGEX,
CONDITION_VALUE_REGEX)
TEST_FUNCTION_VALIDATION_REGEX = r'\s*void\s+(?P<func_name>\w+)\s*\('
FUNCTION_ARG_LIST_END_REGEX = r'.*\)'
EXIT_LABEL_REGEX = r'^exit:'
class GeneratorInputError(Exception):
"""
Exception to indicate error in the input files to this script.
This includes missing patterns, test function names and other
parsing errors.
"""
pass
class FileWrapper:
"""
This class extends the file object with attribute line_no,
that indicates line number for the line that is read.
"""
def __init__(self, file_name) -> None:
"""
Instantiate the file object and initialize the line number to 0.
:param file_name: File path to open.
"""
# private mix-in file object
self._f = open(file_name, 'rb')
self._line_no = 0
def __iter__(self):
return self
def __next__(self):
"""
This method makes FileWrapper iterable.
It counts the line numbers as each line is read.
:return: Line read from file.
"""
line = self._f.__next__()
self._line_no += 1
# Convert byte array to string with correct encoding and
# strip any whitespaces added in the decoding process.
return line.decode(sys.getdefaultencoding()).rstrip()+ '\n'
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self._f.__exit__(exc_type, exc_val, exc_tb)
@property
def line_no(self):
"""
Property that indicates line number for the line that is read.
"""
return self._line_no
@property
def name(self):
"""
Property that indicates name of the file that is read.
"""
return self._f.name
def split_dep(dep):
"""
Split NOT character '!' from dependency. Used by gen_dependencies()
:param dep: Dependency list
:return: string tuple. Ex: ('!', MACRO) for !MACRO and ('', MACRO) for
MACRO.
"""
return ('!', dep[1:]) if dep[0] == '!' else ('', dep)
def gen_dependencies(dependencies):
"""
Test suite data and functions specifies compile time dependencies.
This function generates C preprocessor code from the input
dependency list. Caller uses the generated preprocessor code to
wrap dependent code.
A dependency in the input list can have a leading '!' character
to negate a condition. '!' is separated from the dependency using
function split_dep() and proper preprocessor check is generated
accordingly.
:param dependencies: List of dependencies.
:return: if defined and endif code with macro annotations for
readability.
"""
dep_start = ''.join(['#if %sdefined(%s)\n' % (x, y) for x, y in
map(split_dep, dependencies)])
dep_end = ''.join(['#endif /* %s */\n' %
x for x in reversed(dependencies)])
return dep_start, dep_end
def gen_dependencies_one_line(dependencies):
"""
Similar to gen_dependencies() but generates dependency checks in one line.
Useful for generating code with #else block.
:param dependencies: List of dependencies.
:return: Preprocessor check code
"""
defines = '#if ' if dependencies else ''
defines += ' && '.join(['%sdefined(%s)' % (x, y) for x, y in map(
split_dep, dependencies)])
return defines
def gen_function_wrapper(name, local_vars, args_dispatch):
"""
Creates test function wrapper code. A wrapper has the code to
unpack parameters from parameters[] array.
:param name: Test function name
:param local_vars: Local variables declaration code
:param args_dispatch: List of dispatch arguments.
Ex: ['(char *) params[0]', '*((int *) params[1])']
:return: Test function wrapper.
"""
# Then create the wrapper
wrapper = '''
void {name}_wrapper( void ** params )
{{
{unused_params}{locals}
{name}( {args} );
}}
'''.format(name=name,
unused_params='' if args_dispatch else ' (void)params;\n',
args=', '.join(args_dispatch),
locals=local_vars)
return wrapper
def gen_dispatch(name, dependencies):
"""
Test suite code template main_test.function defines a C function
array to contain test case functions. This function generates an
initializer entry for a function in that array. The entry is
composed of a compile time check for the test function
dependencies. At compile time the test function is assigned when
dependencies are met, else NULL is assigned.
:param name: Test function name
:param dependencies: List of dependencies
:return: Dispatch code.
"""
if dependencies:
preprocessor_check = gen_dependencies_one_line(dependencies)
dispatch_code = '''
{preprocessor_check}
{name}_wrapper,
#else
NULL,
#endif
'''.format(preprocessor_check=preprocessor_check, name=name)
else:
dispatch_code = '''
{name}_wrapper,
'''.format(name=name)
return dispatch_code
def parse_until_pattern(funcs_f, end_regex):
"""
Matches pattern end_regex to the lines read from the file object.
Returns the lines read until end pattern is matched.
:param funcs_f: file object for .function file
:param end_regex: Pattern to stop parsing
:return: Lines read before the end pattern
"""
headers = '#line %d "%s"\n' % (funcs_f.line_no + 1, funcs_f.name)
for line in funcs_f:
if re.search(end_regex, line):
break
headers += line
else:
raise GeneratorInputError("file: %s - end pattern [%s] not found!" %
(funcs_f.name, end_regex))
return headers
def validate_dependency(dependency):
"""
Validates a C macro and raises GeneratorInputError on invalid input.
:param dependency: Input macro dependency
:return: input dependency stripped of leading & trailing white spaces.
"""
dependency = dependency.strip()
if not re.match(CONDITION_REGEX, dependency, re.I):
raise GeneratorInputError('Invalid dependency %s' % dependency)
return dependency
def parse_dependencies(inp_str):
"""
Parses dependencies out of inp_str, validates them and returns a
list of macros.
:param inp_str: Input string with macros delimited by ':'.
:return: list of dependencies
"""
dependencies = list(map(validate_dependency, inp_str.split(':')))
return dependencies
def parse_suite_dependencies(funcs_f):
"""
Parses test suite dependencies specified at the top of a
.function file, that starts with pattern BEGIN_DEPENDENCIES
and end with END_DEPENDENCIES. Dependencies are specified
after pattern 'depends_on:' and are delimited by ':'.
:param funcs_f: file object for .function file
:return: List of test suite dependencies.
"""
dependencies = []
for line in funcs_f:
match = re.search(DEPENDENCY_REGEX, line.strip())
if match:
try:
dependencies = parse_dependencies(match.group('dependencies'))
except GeneratorInputError as error:
raise GeneratorInputError(
str(error) + " - %s:%d" % (funcs_f.name, funcs_f.line_no))
if re.search(END_DEP_REGEX, line):
break
else:
raise GeneratorInputError("file: %s - end dependency pattern [%s]"
" not found!" % (funcs_f.name,
END_DEP_REGEX))
return dependencies
def parse_function_dependencies(line):
"""
Parses function dependencies, that are in the same line as
comment BEGIN_CASE. Dependencies are specified after pattern
'depends_on:' and are delimited by ':'.
:param line: Line from .function file that has dependencies.
:return: List of dependencies.
"""
dependencies = []
match = re.search(BEGIN_CASE_REGEX, line)
dep_str = match.group('depends_on')
if dep_str:
match = re.search(DEPENDENCY_REGEX, dep_str)
if match:
dependencies += parse_dependencies(match.group('dependencies'))
return dependencies
ARGUMENT_DECLARATION_REGEX = re.compile(r'(.+?) ?(?:\bconst\b)? ?(\w+)\Z', re.S)
def parse_function_argument(arg, arg_idx, args, local_vars, args_dispatch):
"""
Parses one test function's argument declaration.
:param arg: argument declaration.
:param arg_idx: current wrapper argument index.
:param args: accumulator of arguments' internal types.
:param local_vars: accumulator of internal variable declarations.
:param args_dispatch: accumulator of argument usage expressions.
:return: the number of new wrapper arguments,
or None if the argument declaration is invalid.
"""
# Normalize whitespace
arg = arg.strip()
arg = re.sub(r'\s*\*\s*', r'*', arg)
arg = re.sub(r'\s+', r' ', arg)
# Extract name and type
m = ARGUMENT_DECLARATION_REGEX.search(arg)
if not m:
# E.g. "int x[42]"
return None
typ, _ = m.groups()
if typ in SIGNED_INTEGER_TYPES:
args.append('int')
args_dispatch.append('((mbedtls_test_argument_t *) params[%d])->sint' % arg_idx)
return 1
if typ in STRING_TYPES:
args.append('char*')
args_dispatch.append('(char *) params[%d]' % arg_idx)
return 1
if typ in DATA_TYPES:
args.append('hex')
# create a structure
pointer_initializer = '(uint8_t *) params[%d]' % arg_idx
len_initializer = '((mbedtls_test_argument_t *) params[%d])->len' % (arg_idx+1)
local_vars.append(' data_t data%d = {%s, %s};\n' %
(arg_idx, pointer_initializer, len_initializer))
args_dispatch.append('&data%d' % arg_idx)
return 2
return None
ARGUMENT_LIST_REGEX = re.compile(r'\((.*?)\)', re.S)
def parse_function_arguments(line):
"""
Parses test function signature for validation and generates
a dispatch wrapper function that translates input test vectors
read from the data file into test function arguments.
:param line: Line from .function file that has a function
signature.
:return: argument list, local variables for
wrapper function and argument dispatch code.
"""
# Process arguments, ex: <type> arg1, <type> arg2 )
# This script assumes that the argument list is terminated by ')'
# i.e. the test functions will not have a function pointer
# argument.
m = ARGUMENT_LIST_REGEX.search(line)
arg_list = m.group(1).strip()
if arg_list in ['', 'void']:
return [], '', []
args = []
local_vars = []
args_dispatch = []
arg_idx = 0
for arg in arg_list.split(','):
indexes = parse_function_argument(arg, arg_idx,
args, local_vars, args_dispatch)
if indexes is None:
raise ValueError("Test function arguments can only be 'int', "
"'char *' or 'data_t'\n%s" % line)
arg_idx += indexes
return args, ''.join(local_vars), args_dispatch
def generate_function_code(name, code, local_vars, args_dispatch,
dependencies):
"""
Generate function code with preprocessor checks and parameter dispatch
wrapper.
:param name: Function name
:param code: Function code
:param local_vars: Local variables for function wrapper
:param args_dispatch: Argument dispatch code
:param dependencies: Preprocessor dependencies list
:return: Final function code
"""
# Add exit label if not present
if code.find('exit:') == -1:
split_code = code.rsplit('}', 1)
if len(split_code) == 2:
code = """exit:
;
}""".join(split_code)
code += gen_function_wrapper(name, local_vars, args_dispatch)
preprocessor_check_start, preprocessor_check_end = \
gen_dependencies(dependencies)
return preprocessor_check_start + code + preprocessor_check_end
COMMENT_START_REGEX = re.compile(r'/[*/]')
def skip_comments(line, stream):
"""Remove comments in line.
If the line contains an unfinished comment, read more lines from stream
until the line that contains the comment.
:return: The original line with inner comments replaced by spaces.
Trailing comments and whitespace may be removed completely.
"""
pos = 0
while True:
opening = COMMENT_START_REGEX.search(line, pos)
if not opening:
break
if line[opening.start(0) + 1] == '/': # //...
continuation = line
# Count the number of line breaks, to keep line numbers aligned
# in the output.
line_count = 1
while continuation.endswith('\\\n'):
# This errors out if the file ends with an unfinished line
# comment. That's acceptable to not complicate the code further.
continuation = next(stream)
line_count += 1
return line[:opening.start(0)].rstrip() + '\n' * line_count
# Parsing /*...*/, looking for the end
closing = line.find('*/', opening.end(0))
while closing == -1:
# This errors out if the file ends with an unfinished block
# comment. That's acceptable to not complicate the code further.
line += next(stream)
closing = line.find('*/', opening.end(0))
pos = closing + 2
# Replace inner comment by spaces. There needs to be at least one space
# for things like 'int/*ihatespaces*/foo'. Go further and preserve the
# width of the comment and line breaks, this way positions in error
# messages remain correct.
line = (line[:opening.start(0)] +
re.sub(r'.', r' ', line[opening.start(0):pos]) +
line[pos:])
# Strip whitespace at the end of lines (it's irrelevant to error messages).
return re.sub(r' +(\n|\Z)', r'\1', line)
def parse_function_code(funcs_f, dependencies, suite_dependencies):
"""
Parses out a function from function file object and generates
function and dispatch code.
:param funcs_f: file object of the functions file.
:param dependencies: List of dependencies
:param suite_dependencies: List of test suite dependencies
:return: Function name, arguments, function code and dispatch code.
"""
line_directive = '#line %d "%s"\n' % (funcs_f.line_no + 1, funcs_f.name)
code = ''
has_exit_label = False
for line in funcs_f:
# Check function signature. Function signature may be split
# across multiple lines. Here we try to find the start of
# arguments list, then remove '\n's and apply the regex to
# detect function start.
line = skip_comments(line, funcs_f)
up_to_arg_list_start = code + line[:line.find('(') + 1]
match = re.match(TEST_FUNCTION_VALIDATION_REGEX,
up_to_arg_list_start.replace('\n', ' '), re.I)
if match:
# check if we have full signature i.e. split in more lines
name = match.group('func_name')
if not re.match(FUNCTION_ARG_LIST_END_REGEX, line):
for lin in funcs_f:
line += skip_comments(lin, funcs_f)
if re.search(FUNCTION_ARG_LIST_END_REGEX, line):
break
args, local_vars, args_dispatch = parse_function_arguments(
line)
code += line
break
code += line
else:
raise GeneratorInputError("file: %s - Test functions not found!" %
funcs_f.name)
# Prefix test function name with 'test_'
code = code.replace(name, 'test_' + name, 1)
name = 'test_' + name
# If a test function has no arguments then add 'void' argument to
# avoid "-Wstrict-prototypes" warnings from clang
if len(args) == 0:
code = code.replace('()', '(void)', 1)
for line in funcs_f:
if re.search(END_CASE_REGEX, line):
break
if not has_exit_label:
has_exit_label = \
re.search(EXIT_LABEL_REGEX, line.strip()) is not None
code += line
else:
raise GeneratorInputError("file: %s - end case pattern [%s] not "
"found!" % (funcs_f.name, END_CASE_REGEX))
code = line_directive + code
code = generate_function_code(name, code, local_vars, args_dispatch,
dependencies)
dispatch_code = gen_dispatch(name, suite_dependencies + dependencies)
return (name, args, code, dispatch_code)
def parse_functions(funcs_f):
"""
Parses a test_suite_xxx.function file and returns information
for generating a C source file for the test suite.
:param funcs_f: file object of the functions file.
:return: List of test suite dependencies, test function dispatch
code, function code and a dict with function identifiers
and arguments info.
"""
suite_helpers = ''
suite_dependencies = []
suite_functions = ''
func_info = {}
function_idx = 0
dispatch_code = ''
for line in funcs_f:
if re.search(BEGIN_HEADER_REGEX, line):
suite_helpers += parse_until_pattern(funcs_f, END_HEADER_REGEX)
elif re.search(BEGIN_SUITE_HELPERS_REGEX, line):
suite_helpers += parse_until_pattern(funcs_f,
END_SUITE_HELPERS_REGEX)
elif re.search(BEGIN_DEP_REGEX, line):
suite_dependencies += parse_suite_dependencies(funcs_f)
elif re.search(BEGIN_CASE_REGEX, line):
try:
dependencies = parse_function_dependencies(line)
except GeneratorInputError as error:
raise GeneratorInputError(
"%s:%d: %s" % (funcs_f.name, funcs_f.line_no,
str(error)))
func_name, args, func_code, func_dispatch =\
parse_function_code(funcs_f, dependencies, suite_dependencies)
suite_functions += func_code
# Generate dispatch code and enumeration info
if func_name in func_info:
raise GeneratorInputError(
"file: %s - function %s re-declared at line %d" %
(funcs_f.name, func_name, funcs_f.line_no))
func_info[func_name] = (function_idx, args)
dispatch_code += '/* Function Id: %d */\n' % function_idx
dispatch_code += func_dispatch
function_idx += 1
func_code = (suite_helpers +
suite_functions).join(gen_dependencies(suite_dependencies))
return suite_dependencies, dispatch_code, func_code, func_info
def escaped_split(inp_str, split_char):
"""
Split inp_str on character split_char but ignore if escaped.
Since, return value is used to write back to the intermediate
data file, any escape characters in the input are retained in the
output.
:param inp_str: String to split
:param split_char: Split character
:return: List of splits
"""
if len(split_char) > 1:
raise ValueError('Expected split character. Found string!')
out = re.sub(r'(\\.)|' + split_char,
lambda m: m.group(1) or '\n', inp_str,
len(inp_str)).split('\n')
out = [x for x in out if x]
return out
def parse_test_data(data_f):
"""
Parses .data file for each test case name, test function name,
test dependencies and test arguments. This information is
correlated with the test functions file for generating an
intermediate data file replacing the strings for test function
names, dependencies and integer constant expressions with
identifiers. Mainly for optimising space for on-target
execution.
:param data_f: file object of the data file.
:return: Generator that yields line number, test name, function name,
dependency list and function argument list.
"""
__state_read_name = 0
__state_read_args = 1
state = __state_read_name
dependencies = []
name = ''
for line in data_f:
line = line.strip()
# Skip comments
if line.startswith('#'):
continue
# Blank line indicates end of test
if not line:
if state == __state_read_args:
raise GeneratorInputError("[%s:%d] Newline before arguments. "
"Test function and arguments "
"missing for %s" %
(data_f.name, data_f.line_no, name))
continue
if state == __state_read_name:
# Read test name
name = line
state = __state_read_args
elif state == __state_read_args:
# Check dependencies
match = re.search(DEPENDENCY_REGEX, line)
if match:
try:
dependencies = parse_dependencies(
match.group('dependencies'))
except GeneratorInputError as error:
raise GeneratorInputError(
str(error) + " - %s:%d" %
(data_f.name, data_f.line_no))
else:
# Read test vectors
parts = escaped_split(line, ':')
test_function = parts[0]
args = parts[1:]
yield data_f.line_no, name, test_function, dependencies, args
dependencies = []
state = __state_read_name
if state == __state_read_args:
raise GeneratorInputError("[%s:%d] Newline before arguments. "
"Test function and arguments missing for "
"%s" % (data_f.name, data_f.line_no, name))
def gen_dep_check(dep_id, dep):
"""
Generate code for checking dependency with the associated
identifier.
:param dep_id: Dependency identifier
:param dep: Dependency macro
:return: Dependency check code
"""
if dep_id < 0:
raise GeneratorInputError("Dependency Id should be a positive "
"integer.")
_not, dep = ('!', dep[1:]) if dep[0] == '!' else ('', dep)
if not dep:
raise GeneratorInputError("Dependency should not be an empty string.")
dependency = re.match(CONDITION_REGEX, dep, re.I)
if not dependency:
raise GeneratorInputError('Invalid dependency %s' % dep)
_defined = '' if dependency.group(2) else 'defined'
_cond = dependency.group(2) if dependency.group(2) else ''
_value = dependency.group(3) if dependency.group(3) else ''
dep_check = '''
case {id}:
{{
#if {_not}{_defined}({macro}{_cond}{_value})
ret = DEPENDENCY_SUPPORTED;
#else
ret = DEPENDENCY_NOT_SUPPORTED;
#endif
}}
break;'''.format(_not=_not, _defined=_defined,
macro=dependency.group(1), id=dep_id,
_cond=_cond, _value=_value)
return dep_check
def gen_expression_check(exp_id, exp):
"""
Generates code for evaluating an integer expression using
associated expression Id.
:param exp_id: Expression Identifier
:param exp: Expression/Macro
:return: Expression check code
"""
if exp_id < 0:
raise GeneratorInputError("Expression Id should be a positive "
"integer.")
if not exp:
raise GeneratorInputError("Expression should not be an empty string.")
exp_code = '''
case {exp_id}:
{{
*out_value = {expression};
}}
break;'''.format(exp_id=exp_id, expression=exp)
return exp_code
def write_dependencies(out_data_f, test_dependencies, unique_dependencies):
"""
Write dependencies to intermediate test data file, replacing
the string form with identifiers. Also, generates dependency
check code.
:param out_data_f: Output intermediate data file
:param test_dependencies: Dependencies
:param unique_dependencies: Mutable list to track unique dependencies
that are global to this re-entrant function.
:return: returns dependency check code.
"""
dep_check_code = ''
if test_dependencies:
out_data_f.write('depends_on')
for dep in test_dependencies:
if dep not in unique_dependencies:
unique_dependencies.append(dep)
dep_id = unique_dependencies.index(dep)
dep_check_code += gen_dep_check(dep_id, dep)
else:
dep_id = unique_dependencies.index(dep)
out_data_f.write(':' + str(dep_id))
out_data_f.write('\n')
return dep_check_code
INT_VAL_REGEX = re.compile(r'-?(\d+|0x[0-9a-f]+)$', re.I)
def val_is_int(val: str) -> bool:
"""Whether val is suitable as an 'int' parameter in the .datax file."""
if not INT_VAL_REGEX.match(val):
return False
# Limit the range to what is guaranteed to get through strtol()
return abs(int(val, 0)) <= 0x7fffffff
def write_parameters(out_data_f, test_args, func_args, unique_expressions):
"""
Writes test parameters to the intermediate data file, replacing
the string form with identifiers. Also, generates expression
check code.
:param out_data_f: Output intermediate data file
:param test_args: Test parameters
:param func_args: Function arguments
:param unique_expressions: Mutable list to track unique
expressions that are global to this re-entrant function.
:return: Returns expression check code.
"""
expression_code = ''
for i, _ in enumerate(test_args):
typ = func_args[i]
val = test_args[i]
# Pass small integer constants literally. This reduces the size of
# the C code. Register anything else as an expression.
if typ == 'int' and not val_is_int(val):
typ = 'exp'
if val not in unique_expressions:
unique_expressions.append(val)
# exp_id can be derived from len(). But for
# readability and consistency with case of existing
# let's use index().
exp_id = unique_expressions.index(val)
expression_code += gen_expression_check(exp_id, val)
val = exp_id
else:
val = unique_expressions.index(val)
out_data_f.write(':' + typ + ':' + str(val))
out_data_f.write('\n')
return expression_code
def gen_suite_dep_checks(suite_dependencies, dep_check_code, expression_code):
"""
Generates preprocessor checks for test suite dependencies.
:param suite_dependencies: Test suite dependencies read from the
.function file.
:param dep_check_code: Dependency check code
:param expression_code: Expression check code
:return: Dependency and expression code guarded by test suite
dependencies.
"""
if suite_dependencies:
preprocessor_check = gen_dependencies_one_line(suite_dependencies)
dep_check_code = '''
{preprocessor_check}
{code}
#endif
'''.format(preprocessor_check=preprocessor_check, code=dep_check_code)
expression_code = '''
{preprocessor_check}
{code}
#endif
'''.format(preprocessor_check=preprocessor_check, code=expression_code)
return dep_check_code, expression_code
def get_function_info(func_info, function_name, line_no):
"""Look up information about a test function by name.
Raise an informative expression if function_name is not found.
:param func_info: dictionary mapping function names to their information.
:param function_name: the function name as written in the .function and
.data files.
:param line_no: line number for error messages.
:return Function information (id, args).
"""
test_function_name = 'test_' + function_name
if test_function_name not in func_info:
raise GeneratorInputError("%d: Function %s not found!" %
(line_no, test_function_name))
return func_info[test_function_name]
def gen_from_test_data(data_f, out_data_f, func_info, suite_dependencies):
"""
This function reads test case name, dependencies and test vectors
from the .data file. This information is correlated with the test
functions file for generating an intermediate data file replacing
the strings for test function names, dependencies and integer
constant expressions with identifiers. Mainly for optimising
space for on-target execution.
It also generates test case dependency check code and expression
evaluation code.
:param data_f: Data file object
:param out_data_f: Output intermediate data file
:param func_info: Dict keyed by function and with function id
and arguments info
:param suite_dependencies: Test suite dependencies
:return: Returns dependency and expression check code
"""
unique_dependencies = []
unique_expressions = []
dep_check_code = ''
expression_code = ''
for line_no, test_name, function_name, test_dependencies, test_args in \
parse_test_data(data_f):
out_data_f.write(test_name + '\n')
# Write dependencies
dep_check_code += write_dependencies(out_data_f, test_dependencies,
unique_dependencies)
# Write test function name
func_id, func_args = \
get_function_info(func_info, function_name, line_no)
out_data_f.write(str(func_id))
# Write parameters
if len(test_args) != len(func_args):
raise GeneratorInputError("%d: Invalid number of arguments in test "
"%s. See function %s signature." %
(line_no, test_name, function_name))
expression_code += write_parameters(out_data_f, test_args, func_args,
unique_expressions)
# Write a newline as test case separator
out_data_f.write('\n')
dep_check_code, expression_code = gen_suite_dep_checks(
suite_dependencies, dep_check_code, expression_code)
return dep_check_code, expression_code
def add_input_info(funcs_file, data_file, template_file,
c_file, snippets):
"""
Add generator input info in snippets.
:param funcs_file: Functions file object
:param data_file: Data file object
:param template_file: Template file object
:param c_file: Output C file object
:param snippets: Dictionary to contain code pieces to be
substituted in the template.
:return:
"""
snippets['test_file'] = c_file
snippets['test_main_file'] = template_file
snippets['test_case_file'] = funcs_file
snippets['test_case_data_file'] = data_file
def read_code_from_input_files(platform_file, helpers_file,
out_data_file, snippets):
"""
Read code from input files and create substitutions for replacement
strings in the template file.
:param platform_file: Platform file object
:param helpers_file: Helper functions file object
:param out_data_file: Output intermediate data file object
:param snippets: Dictionary to contain code pieces to be
substituted in the template.
:return:
"""
# Read helpers
with open(helpers_file, 'r') as help_f, open(platform_file, 'r') as \
platform_f:
snippets['test_common_helper_file'] = helpers_file
snippets['test_common_helpers'] = help_f.read()
snippets['test_platform_file'] = platform_file
snippets['platform_code'] = platform_f.read().replace(
'DATA_FILE', out_data_file.replace('\\', '\\\\')) # escape '\'
def write_test_source_file(template_file, c_file, snippets):
"""
Write output source file with generated source code.
:param template_file: Template file name
:param c_file: Output source file
:param snippets: Generated and code snippets
:return:
"""
# Create a placeholder pattern with the correct named capture groups
# to override the default provided with Template.
# Match nothing (no way of escaping placeholders).
escaped = "(?P<escaped>(?!))"
# Match the "__MBEDTLS_TEST_TEMPLATE__PLACEHOLDER_NAME" pattern.
named = "__MBEDTLS_TEST_TEMPLATE__(?P<named>[A-Z][_A-Z0-9]*)"
# Match nothing (no braced placeholder syntax).
braced = "(?P<braced>(?!))"
# If not already matched, a "__MBEDTLS_TEST_TEMPLATE__" prefix is invalid.
invalid = "(?P<invalid>__MBEDTLS_TEST_TEMPLATE__)"
placeholder_pattern = re.compile("|".join([escaped, named, braced, invalid]))
with open(template_file, 'r') as template_f, open(c_file, 'w') as c_f:
for line_no, line in enumerate(template_f.readlines(), 1):
# Update line number. +1 as #line directive sets next line number
snippets['line_no'] = line_no + 1
template = string.Template(line)
template.pattern = placeholder_pattern
snippets = {k.upper():v for (k, v) in snippets.items()}
code = template.substitute(**snippets)
c_f.write(code)
def parse_function_file(funcs_file, snippets):
"""
Parse function file and generate function dispatch code.
:param funcs_file: Functions file name
:param snippets: Dictionary to contain code pieces to be
substituted in the template.
:return:
"""
with FileWrapper(funcs_file) as funcs_f:
suite_dependencies, dispatch_code, func_code, func_info = \
parse_functions(funcs_f)
snippets['functions_code'] = func_code
snippets['dispatch_code'] = dispatch_code
return suite_dependencies, func_info
def generate_intermediate_data_file(data_file, out_data_file,
suite_dependencies, func_info, snippets):
"""
Generates intermediate data file from input data file and
information read from functions file.
:param data_file: Data file name
:param out_data_file: Output/Intermediate data file
:param suite_dependencies: List of suite dependencies.
:param func_info: Function info parsed from functions file.
:param snippets: Dictionary to contain code pieces to be
substituted in the template.
:return:
"""
with FileWrapper(data_file) as data_f, \
open(out_data_file, 'w') as out_data_f:
dep_check_code, expression_code = gen_from_test_data(
data_f, out_data_f, func_info, suite_dependencies)
snippets['dep_check_code'] = dep_check_code
snippets['expression_code'] = expression_code
def generate_code(**input_info):
"""
Generates C source code from test suite file, data file, common
helpers file and platform file.
input_info expands to following parameters:
funcs_file: Functions file object
data_file: Data file object
template_file: Template file object
platform_file: Platform file object
helpers_file: Helper functions file object
suites_dir: Test suites dir
c_file: Output C file object
out_data_file: Output intermediate data file object
:return:
"""
funcs_file = input_info['funcs_file']
data_file = input_info['data_file']
template_file = input_info['template_file']
platform_file = input_info['platform_file']
helpers_file = input_info['helpers_file']
suites_dir = input_info['suites_dir']
c_file = input_info['c_file']
out_data_file = input_info['out_data_file']
for name, path in [('Functions file', funcs_file),
('Data file', data_file),
('Template file', template_file),
('Platform file', platform_file),
('Helpers code file', helpers_file),
('Suites dir', suites_dir)]:
if not os.path.exists(path):
raise IOError("ERROR: %s [%s] not found!" % (name, path))
snippets = {'generator_script': os.path.basename(__file__)}
read_code_from_input_files(platform_file, helpers_file,
out_data_file, snippets)
add_input_info(funcs_file, data_file, template_file,
c_file, snippets)
suite_dependencies, func_info = parse_function_file(funcs_file, snippets)
generate_intermediate_data_file(data_file, out_data_file,
suite_dependencies, func_info, snippets)
write_test_source_file(template_file, c_file, snippets)
def main():
"""
Command line parser.
:return:
"""
parser = argparse.ArgumentParser(
description='Dynamically generate test suite code.')
parser.add_argument("-f", "--functions-file",
dest="funcs_file",
help="Functions file",
metavar="FUNCTIONS_FILE",
required=True)
parser.add_argument("-d", "--data-file",
dest="data_file",
help="Data file",
metavar="DATA_FILE",
required=True)
parser.add_argument("-t", "--template-file",
dest="template_file",
help="Template file",
metavar="TEMPLATE_FILE",
required=True)
parser.add_argument("-s", "--suites-dir",
dest="suites_dir",
help="Suites dir",
metavar="SUITES_DIR",
required=True)
parser.add_argument("--helpers-file",
dest="helpers_file",
help="Helpers file",
metavar="HELPERS_FILE",
required=True)
parser.add_argument("-p", "--platform-file",
dest="platform_file",
help="Platform code file",
metavar="PLATFORM_FILE",
required=True)
parser.add_argument("-o", "--out-dir",
dest="out_dir",
help="Dir where generated code and scripts are copied",
metavar="OUT_DIR",
required=True)
args = parser.parse_args()
data_file_name = os.path.basename(args.data_file)
data_name = os.path.splitext(data_file_name)[0]
out_c_file = os.path.join(args.out_dir, data_name + '.c')
out_data_file = os.path.join(args.out_dir, data_name + '.datax')
out_c_file_dir = os.path.dirname(out_c_file)
out_data_file_dir = os.path.dirname(out_data_file)
for directory in [out_c_file_dir, out_data_file_dir]:
if not os.path.exists(directory):
os.makedirs(directory)
generate_code(funcs_file=args.funcs_file, data_file=args.data_file,
template_file=args.template_file,
platform_file=args.platform_file,
helpers_file=args.helpers_file, suites_dir=args.suites_dir,
c_file=out_c_file, out_data_file=out_data_file)
if __name__ == "__main__":
try:
main()
except GeneratorInputError as err:
sys.exit("%s: input error: %s" %
(os.path.basename(sys.argv[0]), str(err)))
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