debug.cc revision 8699 
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31#include <sys/types.h>
32#include <unistd.h>
33
34#include <algorithm>
35#include <csignal>
36#include <map>
37#include <vector>
38
39#include "base/cprintf.hh"
40#include "base/debug.hh"
41#include "base/misc.hh"
42
43using namespace std;
44
45namespace Debug {
46
47//
48// This function will cause the process to signal itself with a
49// SIGTRAP which is ignored if not in gdb, but will cause the debugger
50// to break if in gdb.
51//
52void
53breakpoint()
54{
55#ifndef NDEBUG
56    kill(getpid(), SIGTRAP);
57#else
58    cprintf("Debug::breakpoint suppressed, compiled with NDEBUG\n");
59#endif
60}
61
62//
63// Flags for debugging purposes.  Primarily for trace.hh
64//
65typedef std::map<string, Flag *> FlagsMap;
66int allFlagsVersion = 0;
67FlagsMap &
68allFlags()
69{
70    static FlagsMap flags;
71    return flags;
72}
73
74Flag *
75findFlag(const std::string &name)
76{
77    FlagsMap::iterator i = allFlags().find(name);
78    if (i == allFlags().end())
79        return NULL;
80    return i->second;
81}
82
83Flag::Flag(const char *name, const char *desc)
84    : _name(name), _desc(desc)
85{
86    pair<FlagsMap::iterator, bool> result =
87        allFlags().insert(make_pair(name, this));
88
89    if (!result.second)
90        panic("Flag %s already defined!", name);
91
92    ++allFlagsVersion;
93}
94
95Flag::~Flag()
96{
97    // should find and remove flag.
98}
99
100void
101CompoundFlag::enable()
102{
103    SimpleFlag::enable();
104    for_each(_kids.begin(), _kids.end(), mem_fun(&Flag::enable));
105}
106
107void
108CompoundFlag::disable()
109{
110    SimpleFlag::disable();
111    for_each(_kids.begin(), _kids.end(), mem_fun(&Flag::disable));
112}
113
114struct AllFlags : public Flag
115{
116    AllFlags()
117        : Flag("All", "All Flags")
118    {}
119
120    void
121    enable()
122    {
123        FlagsMap::iterator i = allFlags().begin();
124        FlagsMap::iterator end = allFlags().end();
125        for (; i != end; ++i)
126            if (i->second != this)
127                i->second->enable();
128    }
129
130    void
131    disable()
132    {
133        FlagsMap::iterator i = allFlags().begin();
134        FlagsMap::iterator end = allFlags().end();
135        for (; i != end; ++i)
136            if (i->second != this)
137                i->second->disable();
138    }
139};
140
141AllFlags theAllFlags;
142Flag *const All = &theAllFlags;
143
144bool
145changeFlag(const char *s, bool value)
146{
147    Flag *f = findFlag(s);
148    if (!f)
149        return false;
150
151    if (value)
152        f->enable();
153    else
154        f->disable();
155
156    return true;
157}
158
159} // namespace Debug
160
161// add a set of functions that can easily be invoked from gdb
162void
163setDebugFlag(const char *string)
164{
165    Debug::changeFlag(string, true);
166}
167
168void
169clearDebugFlag(const char *string)
170{
171    Debug::changeFlag(string, false);
172}
173
174void
175dumpDebugFlags()
176{
177    using namespace Debug;
178    FlagsMap::iterator i = allFlags().begin();
179    FlagsMap::iterator end = allFlags().end();
180    for (; i != end; ++i) {
181        SimpleFlag *f = dynamic_cast<SimpleFlag *>(i->second);
182        if (f && f->status())
183            cprintf("%s\n", f->name());
184    }
185}
186