summaryrefslogtreecommitdiff
path: root/src/base/trace.cc
blob: 90db7f045c094ae04156f4bdb43d14c28d51d575 (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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
/*
 * Copyright (c) 2001-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <ctype.h>
#include <fstream>
#include <iostream>
#include <list>
#include <string>
#include <vector>

#include "base/misc.hh"
#include "base/trace.hh"
#include "base/str.hh"

using namespace std;

namespace Trace {
const string DefaultName("global");
FlagVec flags(NumFlags, false);

//
// This variable holds the output stream for debug information.  Other
// than setting up/redirecting this stream, do *NOT* reference this
// directly; use DebugOut() (see below) to access this stream for
// output.
//
ostream *dprintf_stream = &cerr;

ObjectMatch ignore;

Log theLog;

Log::Log()
{
    size = 0;
    buffer = NULL;
}


void
Log::init(int _size)
{
    if (buffer != NULL) {
        fatal("Trace::Log::init called twice!");
    }

    size = _size;

    buffer = new Record *[size];

    for (int i = 0; i < size; ++i) {
        buffer[i] = NULL;
    }

    nextRecPtr = &buffer[0];
    wrapRecPtr = &buffer[size];
}


Log::~Log()
{
    for (int i = 0; i < size; ++i) {
        delete buffer[i];
    }

    delete [] buffer;
}


void
Log::append(Record *rec)
{
    // dump record to output stream if there's one open
    if (dprintf_stream != NULL) {
        rec->dump(*dprintf_stream);
    } else {
        rec->dump(cout);
    }

    // no buffering: justget rid of it now
    if (buffer == NULL) {
        delete rec;
        return;
    }

    Record *oldRec = *nextRecPtr;

    if (oldRec != NULL) {
        // log has wrapped: overwrite
        delete oldRec;
    }

    *nextRecPtr = rec;

    if (++nextRecPtr == wrapRecPtr) {
        nextRecPtr = &buffer[0];
    }
}


void
Log::dump(ostream &os)
{
    if (buffer == NULL) {
        return;
    }

    Record **bufPtr = nextRecPtr;

    if (*bufPtr == NULL) {
        // next record slot is empty: log must not be full yet.
        // start dumping from beginning of buffer
        bufPtr = buffer;
    }

    do {
        Record *rec = *bufPtr;

        rec->dump(os);

        if (++bufPtr == wrapRecPtr) {
            bufPtr = &buffer[0];
        }
    } while (bufPtr != nextRecPtr);
}

PrintfRecord::~PrintfRecord()
{
    delete &args;
}

void
PrintfRecord::dump(ostream &os)
{
    string fmt = "";

    if (!name.empty()) {
        fmt = "%s: " + fmt;
        args.prepend(name);
    }

    if (cycle != (Tick)-1) {
        fmt = "%7d: " + fmt;
        args.prepend(cycle);
    }

    fmt += format;

    args.dump(os, fmt);
    os.flush();
}

DataRecord::DataRecord(Tick _cycle, const string &_name,
                       const void *_data, int _len)
    : Record(_cycle), name(_name), len(_len)
{
    data = new uint8_t[len];
    memcpy(data, _data, len);
}

DataRecord::~DataRecord()
{
    delete [] data;
}

void
DataRecord::dump(ostream &os)
{
    int c, i, j;

    for (i = 0; i < len; i += 16) {
        ccprintf(os, "%d: %s: %08x  ", cycle, name, i);
        c = len - i;
        if (c > 16) c = 16;

        for (j = 0; j < c; j++) {
            ccprintf(os, "%02x ", data[i + j] & 0xff);
            if ((j & 0xf) == 7 && j > 0)
                ccprintf(os, " ");
        }

        for (; j < 16; j++)
            ccprintf(os, "   ");
        ccprintf(os, "  ");

        for (j = 0; j < c; j++) {
            int ch = data[i + j] & 0x7f;
            ccprintf(os,
                     "%c", (char)(isprint(ch) ? ch : ' '));
        }

        ccprintf(os, "\n");

        if (c < 16)
            break;
    }
}
} // namespace Trace

//
// Returns the current output stream for debug information.  As a
// wrapper around Trace::dprintf_stream, this handles cases where debug
// information is generated in the process of parsing .ini options,
// before we process the option that sets up the debug output stream
// itself.
//
std::ostream &
DebugOut()
{
    return *Trace::dprintf_stream;
}

/////////////////////////////////////////////
//
// C-linkage functions for invoking from gdb
//
/////////////////////////////////////////////

//
// Dump trace buffer to specified file (cout if NULL)
//
extern "C"
void
dumpTrace(const char *filename)
{
    if (filename != NULL) {
        ofstream out(filename);
        Trace::theLog.dump(out);
        out.close();
    }
    else {
        Trace::theLog.dump(cout);
    }
}


//
// Turn on/off trace output to cerr.  Typically used when trace output
// is only going to circular buffer, but you want to see what's being
// sent there as you step through some code in gdb.  This uses the
// same facility as the "trace to file" feature, and will print error
// messages rather than clobbering an existing ostream pointer.
//
extern "C"
void
echoTrace(bool on)
{
    if (on) {
        if (Trace::dprintf_stream != NULL) {
            cerr << "Already echoing trace to a file... go do a 'tail -f'"
                 << " on that file instead." << endl;
        } else {
            Trace::dprintf_stream = &cerr;
        }
    } else {
        if (Trace::dprintf_stream != &cerr) {
            cerr << "Not echoing trace to cerr." << endl;
        } else {
            Trace::dprintf_stream = NULL;
        }
    }
}

extern "C"
void
printTraceFlags()
{
    using namespace Trace;
    for (int i = 0; i < numFlagStrings; ++i)
        if (flags[i])
            cprintf("%s\n", flagStrings[i]);
}

void
tweakTraceFlag(const char *string, bool value)
{
    using namespace Trace;
    std::string str(string);

    for (int i = 0; i < numFlagStrings; ++i) {
        if (str != flagStrings[i])
            continue;

        int idx = i;

        if (idx < NumFlags) {
            flags[idx] = value;
        } else {
            idx -= NumFlags;
            if (idx >= NumCompoundFlags) {
                ccprintf(cerr, "Invalid compound flag");
                return;
            }

            const Flags *flagVec = compoundFlags[idx];

            for (int j = 0; flagVec[j] != -1; ++j) {
                if (flagVec[j] >= NumFlags) {
                    ccprintf(cerr, "Invalid compound flag");
                    return;
                }
                flags[flagVec[j]] = value;
            }
        }

        cprintf("flag %s was %s\n", string, value ? "set" : "cleared");
        return;
    }

    cprintf("could not find flag %s\n", string);
}

extern "C"
void
setTraceFlag(const char *string)
{
    tweakTraceFlag(string, true);
}

extern "C"
void
clearTraceFlag(const char *string)
{
    tweakTraceFlag(string, false);
}