2 # Copyright (C) 2014 Free Software Foundation, Inc.
3 # This file is part of the GNU C Library.
5 # The GNU C Library is free software; you can redistribute it and/or
6 # modify it under the terms of the GNU Lesser General Public
7 # License as published by the Free Software Foundation; either
8 # version 2.1 of the License, or (at your option) any later version.
10 # The GNU C Library is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 # Lesser General Public License for more details.
15 # You should have received a copy of the GNU Lesser General Public
16 # License along with the GNU C Library; if not, see
17 # <http://www.gnu.org/licenses/>.
19 """Benchmark program generator script
21 This script takes a function name as input and generates a program using
22 an input file located in the benchtests directory. The name of the
23 input file should be of the form foo-inputs where 'foo' is the name of
27 from __future__ import print_function
32 # Macro definitions for functions that take no arguments. For functions
33 # that take arguments, the STRUCT_TEMPLATE, ARGS_TEMPLATE and
34 # VARIANTS_TEMPLATE are used instead.
35 DEFINES_TEMPLATE = '''
36 #define CALL_BENCH_FUNC(v, i) %(func)s ()
37 #define NUM_VARIANTS (1)
38 #define NUM_SAMPLES(v) (1)
39 #define VARIANT(v) FUNCNAME "()"
42 # Structures to store arguments for the function call. A function may
43 # have its inputs partitioned to represent distinct performance
44 # characteristics or distinct flavors of the function. Each such
45 # variant is represented by the _VARIANT structure. The ARGS structure
46 # represents a single set of arguments.
48 #define CALL_BENCH_FUNC(v, i) %(func)s (%(func_args)s)
63 # The actual input arguments.
65 struct args in%(argnum)d[%(num_args)d] = {
70 # The actual variants, along with macros defined to access the variants.
71 VARIANTS_TEMPLATE = '''
72 struct _variants variants[%(num_variants)d] = {
76 #define NUM_VARIANTS %(num_variants)d
77 #define NUM_SAMPLES(i) (variants[i].count)
78 #define VARIANT(i) (variants[i].name)
81 # Epilogue for the generated source file.
83 #define BENCH_FUNC(i, j) ({%(getret)s CALL_BENCH_FUNC (i, j);})
84 #define FUNCNAME "%(func)s"
85 #include "bench-skeleton.c"'''
88 def gen_source(func, directives, all_vals):
89 """Generate source for the function
91 Generate the C source for the function from the values and
95 func: The function name
96 directives: A dictionary of directives applicable to this function
97 all_vals: A dictionary input values
99 # The includes go in first.
100 for header in directives['includes']:
101 print('#include <%s>' % header)
103 for header in directives['include-sources']:
104 print('#include "%s"' % header)
106 # Print macros. This branches out to a separate routine if
107 # the function takes arguments.
108 if not directives['args']:
109 print(DEFINES_TEMPLATE % {'func': func})
112 outargs = _print_arg_data(func, directives, all_vals)
114 # Print the output variable definitions if necessary.
118 # If we have a return value from the function, make sure it is
119 # assigned to prevent the compiler from optimizing out the
121 if directives['ret']:
122 print('static %s volatile ret;' % directives['ret'])
127 print(EPILOGUE % {'getret': getret, 'func': func})
130 def _print_arg_data(func, directives, all_vals):
131 """Print argument data
133 This is a helper function for gen_source that prints structure and
134 values for arguments and their variants and returns output arguments
139 directives: A dictionary of directives applicable to this function
140 all_vals: A dictionary input values
143 Returns a list of definitions for function arguments that act as
146 # First, all of the definitions. We process writing of
147 # CALL_BENCH_FUNC, struct args and also the output arguments
148 # together in a single traversal of the arguments list.
153 for arg, i in zip(directives['args'], itertools.count()):
154 if arg[0] == '<' and arg[-1] == '>':
157 die('Output argument must be a pointer type')
159 outargs.append('static %s out%d;' % (arg[1:pos], i))
160 func_args.append(' &out%d' % i)
162 arg_struct.append(' %s volatile arg%d;' % (arg, i))
163 func_args.append('variants[v].in[i].arg%d' % i)
165 print(STRUCT_TEMPLATE % {'args' : '\n'.join(arg_struct), 'func': func,
166 'func_args': ', '.join(func_args)})
168 # Now print the values.
170 for (k, vals), i in zip(all_vals.items(), itertools.count()):
171 out = [' {%s},' % v for v in vals]
173 # Members for the variants structure list that we will
175 variants.append(' {"%s(%s)", %d, in%d},' % (func, k, len(vals), i))
176 print(ARGS_TEMPLATE % {'argnum': i, 'num_args': len(vals),
177 'args': '\n'.join(out)})
179 # Print the variants and the last set of macros.
180 print(VARIANTS_TEMPLATE % {'num_variants': len(all_vals),
181 'variants': '\n'.join(variants)})
185 def _process_directive(d_name, d_val):
186 """Process a directive.
188 Evaluate the directive name and value passed and return the
189 processed value. This is a helper function for parse_file.
192 d_name: Name of the directive
193 d_val: The string value to process
196 The processed value, which may be the string as it is or an object
197 that describes the directive.
199 # Process the directive values if necessary. name and ret don't
200 # need any processing.
201 if d_name.startswith('include'):
202 d_val = d_val.split(',')
203 elif d_name == 'args':
204 d_val = d_val.split(':')
210 def parse_file(func):
211 """Parse an input file
213 Given a function name, open and parse an input file for the function
214 and get the necessary parameters for the generated code and the list
218 func: The function name
221 A tuple of two elements, one a dictionary of directives and the
222 other a dictionary of all input values.
230 'include-sources': [],
235 with open('%s-inputs' % func) as f:
237 # Look for directives and parse it if found.
238 if line.startswith('##'):
240 d_name, d_val = line[2:].split(':', 1)
241 d_name = d_name.strip()
242 d_val = d_val.strip()
243 directives[d_name] = _process_directive(d_name, d_val)
244 except (IndexError, KeyError):
245 die('Invalid directive: %s' % line[2:])
247 # Skip blank lines and comments.
248 line = line.split('#', 1)[0].rstrip()
252 # Otherwise, we're an input. Add to the appropriate
254 cur_name = directives['name']
255 all_vals.setdefault(cur_name, [])
256 all_vals[cur_name].append(line)
257 except IOError as ex:
258 die("Failed to open input file (%s): %s" % (ex.filename, ex.strerror))
260 return directives, all_vals
264 """Exit with an error
266 Prints an error message to the standard error stream and exits with
270 msg: The error message to print to standard error
272 print('%s\n' % msg, file=sys.stderr)
273 sys.exit(os.EX_DATAERR)
279 Use the first command line argument as function name and parse its
280 input file to generate C source that calls the function repeatedly
284 args: The command line arguments with the program name dropped
287 os.EX_USAGE on error and os.EX_OK on success.
290 print('Usage: %s <function>' % sys.argv[0])
293 directives, all_vals = parse_file(args[0])
294 gen_source(args[0], directives, all_vals)
298 if __name__ == '__main__':
299 sys.exit(main(sys.argv[1:]))