summaryrefslogtreecommitdiffstats
path: root/Tools/scripts/objgraph.py
blob: 1e1fce07dd5e3bb5d96347d627a9786fc3008a4d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
#! /usr/bin/env python3

# objgraph
#
# Read "nm -o" input (on IRIX: "nm -Bo") of a set of libraries or modules
# and print various interesting listings, such as:
#
# - which names are used but not defined in the set (and used where),
# - which names are defined in the set (and where),
# - which modules use which other modules,
# - which modules are used by which other modules.
#
# Usage: objgraph [-cdu] [file] ...
# -c: print callers per objectfile
# -d: print callees per objectfile
# -u: print usage of undefined symbols
# If none of -cdu is specified, all are assumed.
# Use "nm -o" to generate the input (on IRIX: "nm -Bo"),
# e.g.: nm -o /lib/libc.a | objgraph


import sys
import os
import getopt
import re

# Types of symbols.
#
definitions = 'TRGDSBAEC'
externals = 'UV'
ignore = 'Nntrgdsbavuc'

# Regular expression to parse "nm -o" output.
#
matcher = re.compile('(.*):\t?........ (.) (.*)$')

# Store "item" in "dict" under "key".
# The dictionary maps keys to lists of items.
# If there is no list for the key yet, it is created.
#
def store(dict, key, item):
    if key in dict:
        dict[key].append(item)
    else:
        dict[key] = [item]

# Return a flattened version of a list of strings: the concatenation
# of its elements with intervening spaces.
#
def flat(list):
    s = ''
    for item in list:
        s = s + ' ' + item
    return s[1:]

# Global variables mapping defined/undefined names to files and back.
#
file2undef = {}
def2file = {}
file2def = {}
undef2file = {}

# Read one input file and merge the data into the tables.
# Argument is an open file.
#
def readinput(fp):
    while 1:
        s = fp.readline()
        if not s:
            break
        # If you get any output from this line,
        # it is probably caused by an unexpected input line:
        if matcher.search(s) < 0: s; continue # Shouldn't happen
        (ra, rb), (r1a, r1b), (r2a, r2b), (r3a, r3b) = matcher.regs[:4]
        fn, name, type = s[r1a:r1b], s[r3a:r3b], s[r2a:r2b]
        if type in definitions:
            store(def2file, name, fn)
            store(file2def, fn, name)
        elif type in externals:
            store(file2undef, fn, name)
            store(undef2file, name, fn)
        elif not type in ignore:
            print(fn + ':' + name + ': unknown type ' + type)

# Print all names that were undefined in some module and where they are
# defined.
#
def printcallee():
    flist = sorted(file2undef.keys())
    for filename in flist:
        print(filename + ':')
        elist = file2undef[filename]
        elist.sort()
        for ext in elist:
            if len(ext) >= 8:
                tabs = '\t'
            else:
                tabs = '\t\t'
            if ext not in def2file:
                print('\t' + ext + tabs + ' *undefined')
            else:
                print('\t' + ext + tabs + flat(def2file[ext]))

# Print for each module the names of the other modules that use it.
#
def printcaller():
    files = sorted(file2def.keys())
    for filename in files:
        callers = []
        for label in file2def[filename]:
            if label in undef2file:
                callers = callers + undef2file[label]
        if callers:
            callers.sort()
            print(filename + ':')
            lastfn = ''
            for fn in callers:
                if fn != lastfn:
                    print('\t' + fn)
                lastfn = fn
        else:
            print(filename + ': unused')

# Print undefined names and where they are used.
#
def printundef():
    undefs = {}
    for filename in list(file2undef.keys()):
        for ext in file2undef[filename]:
            if ext not in def2file:
                store(undefs, ext, filename)
    elist = sorted(undefs.keys())
    for ext in elist:
        print(ext + ':')
        flist = sorted(undefs[ext])
        for filename in flist:
            print('\t' + filename)

# Print warning messages about names defined in more than one file.
#
def warndups():
    savestdout = sys.stdout
    sys.stdout = sys.stderr
    names = sorted(def2file.keys())
    for name in names:
        if len(def2file[name]) > 1:
            print('warning:', name, 'multiply defined:', end=' ')
            print(flat(def2file[name]))
    sys.stdout = savestdout

# Main program
#
def main():
    try:
        optlist, args = getopt.getopt(sys.argv[1:], 'cdu')
    except getopt.error:
        sys.stdout = sys.stderr
        print('Usage:', os.path.basename(sys.argv[0]), end=' ')
        print('[-cdu] [file] ...')
        print('-c: print callers per objectfile')
        print('-d: print callees per objectfile')
        print('-u: print usage of undefined symbols')
        print('If none of -cdu is specified, all are assumed.')
        print('Use "nm -o" to generate the input (on IRIX: "nm -Bo"),')
        print('e.g.: nm -o /lib/libc.a | objgraph')
        return 1
    optu = optc = optd = 0
    for opt, void in optlist:
        if opt == '-u':
            optu = 1
        elif opt == '-c':
            optc = 1
        elif opt == '-d':
            optd = 1
    if optu == optc == optd == 0:
        optu = optc = optd = 1
    if not args:
        args = ['-']
    for filename in args:
        if filename == '-':
            readinput(sys.stdin)
        else:
            readinput(open(filename, 'r'))
    #
    warndups()
    #
    more = (optu + optc + optd > 1)
    if optd:
        if more:
            print('---------------All callees------------------')
        printcallee()
    if optu:
        if more:
            print('---------------Undefined callees------------')
        printundef()
    if optc:
        if more:
            print('---------------All Callers------------------')
        printcaller()
    return 0

# Call the main program.
# Use its return value as exit status.
# Catch interrupts to avoid stack trace.
#
if __name__ == '__main__':
    try:
        sys.exit(main())
    except KeyboardInterrupt:
        sys.exit(1)