File: legacyspecparser.cpp

package info (click to toggle)
qtbase-opensource-src 5.11.3+dfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 312,420 kB
  • sloc: cpp: 1,831,913; ansic: 318,856; xml: 113,585; python: 9,691; java: 7,209; asm: 4,023; perl: 2,151; sh: 1,790; yacc: 1,733; lex: 1,197; makefile: 301; objc: 70
file content (300 lines) | stat: -rw-r--r-- 12,238 bytes parent folder | download | duplicates (5)
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
/***************************************************************************
**
** Copyright (C) 2013 Klaralvdalens Datakonsult AB (KDAB)
** Contact: https://www.qt.io/licensing/
**
** This file is part of the utilities of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "legacyspecparser.h"

#include <QDebug>
#include <QFile>
#include <QRegExp>
#include <QStringList>
#include <QTextStream>

#ifdef SPECPARSER_DEBUG
#define qLegacySpecParserDebug qDebug
#else
#define qLegacySpecParserDebug QT_NO_QDEBUG_MACRO
#endif

bool LegacySpecParser::parse()
{
    // Get the mapping form generic types to specific types suitable for use in C-headers
    if (!parseTypeMap())
        return false;

    // Open up a stream on the actual OpenGL function spec file
    QFile file(specFileName());
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qWarning() << "Failed to open spec file:" << specFileName() << "Aborting";
        return false;
    }

    QTextStream stream(&file);

    // Extract the info that we need
    parseFunctions(stream);
    return true;
}

bool LegacySpecParser::parseTypeMap()
{
    QFile file(typeMapFileName());
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qWarning() << "Failed to open type file:" << typeMapFileName() << "Aborting";
        return false;
    }

    QTextStream stream(&file);

    static QRegExp typeMapRegExp("([^,]+)\\W+([^,]+)");

    while (!stream.atEnd()) {
        QString line = stream.readLine();

        if (line.startsWith(QLatin1Char('#')))
            continue;

        if (typeMapRegExp.indexIn(line) != -1) {
            QString key = typeMapRegExp.cap(1).simplified();
            QString value = typeMapRegExp.cap(2).simplified();

            // Special case for void
            if (value == QLatin1String("*"))
                value = QStringLiteral("void");

            m_typeMap.insert(key, value);
            qLegacySpecParserDebug() << "Found type mapping from" << key << "=>" << value;
        }
    }

    return true;
}

void LegacySpecParser::parseEnums()
{
}

void LegacySpecParser::parseFunctions(QTextStream &stream)
{
    static QRegExp functionRegExp("^(\\w+)\\(.*\\)");
    static QRegExp returnRegExp("^\\treturn\\s+(\\S+)");
    static QRegExp argumentRegExp("param\\s+(\\S+)\\s+(\\S+) (\\S+) (\\S+)");
    static QRegExp versionRegExp("^\\tversion\\s+(\\S+)");
    static QRegExp deprecatedRegExp("^\\tdeprecated\\s+(\\S+)");
    static QRegExp categoryRegExp("^\\tcategory\\s+(\\S+)");
    static QRegExp categoryVersionRegExp("VERSION_(\\d)_(\\d)");
    static QRegExp extToCoreVersionRegExp("passthru:\\s/\\*\\sOpenGL\\s(\\d)\\.(\\d)\\s.*\\sextensions:");
    static QRegExp extToCoreRegExp("passthru:\\s/\\*\\s(ARB_\\S*)\\s.*\\*/");

    Function currentFunction;
    VersionProfile currentVersionProfile;
    QString currentCategory;
    bool haveVersionInfo = false;
    bool acceptCurrentFunctionInCore = false;
    bool acceptCurrentFunctionInExtension = false;

    QHash<QString, Version> extensionsNowInCore;
    Version extToCoreCurrentVersion;
    int functionCount = 0;

    QSet<Version> versions;

    while (!stream.atEnd()) {
        QString line = stream.readLine();
        if (line.startsWith("#"))
            continue;

        if (functionRegExp.indexIn(line) != -1) {

            if (!currentFunction.name.isEmpty()) {

                // NB - Special handling!
                // Versions 4.2 and 4.3 (and probably newer) add functionality by
                // subsuming extensions such as ARB_texture_storage. However, some extensions
                // also include functions to interact with the EXT_direct_state_access
                // extension. These functions should be added to the DSA extension rather
                // than the core functionality. The core will already contain non-DSA
                // versions of these functions.
                if (acceptCurrentFunctionInCore && currentFunction.name.endsWith(QLatin1String("EXT"))) {
                    acceptCurrentFunctionInCore = false;
                    acceptCurrentFunctionInExtension = true;
                    currentCategory = QStringLiteral("EXT_direct_state_access");
                }

                // Finish off previous function (if any) by inserting it into the core
                // functionality or extension functionality (or both)
                if (acceptCurrentFunctionInCore) {
                    m_functions.insert(currentVersionProfile, currentFunction);
                    versions.insert(currentVersionProfile.version);
                }

                if (acceptCurrentFunctionInExtension) {
                    FunctionProfile fp;
                    fp.profile = currentVersionProfile.profile;
                    fp.function = currentFunction;
                    m_extensionFunctions.insert(currentCategory, fp);
                }
            }

            // Start a new function
            ++functionCount;
            haveVersionInfo = false;
            acceptCurrentFunctionInCore = true;
            acceptCurrentFunctionInExtension = false;
            currentCategory = QString();
            currentFunction = Function();

            // We assume a core function unless we find a deprecated flag (see below)
            currentVersionProfile = VersionProfile();
            currentVersionProfile.profile = VersionProfile::CoreProfile;

            // Extract the function name
            QString functionName = functionRegExp.cap(1);
            currentFunction.name = functionName;
            qLegacySpecParserDebug() << "Found function:" << functionName;

        } else if (argumentRegExp.indexIn(line) != -1) {
            // Extract info about this function argument
            Argument arg;
            arg.name = argumentRegExp.cap(1);

            QString type = argumentRegExp.cap(2); // Lookup in type map
            arg.type = m_typeMap.value(type);

            QString direction = argumentRegExp.cap(3);
            if (direction == QLatin1String("in")) {
                arg.direction = Argument::In;
            } else if (direction == QLatin1String("out")) {
                arg.direction = Argument::Out;
            } else {
                qWarning() << "Invalid argument direction found:" << direction;
                acceptCurrentFunctionInCore = false;
            }

            QString mode = argumentRegExp.cap(4);
            if (mode == QLatin1String("value")) {
                arg.mode = Argument::Value;
            } else if (mode == QLatin1String("array")) {
                arg.mode = Argument::Array;
            } else if (mode == QLatin1String("reference")) {
                arg.mode = Argument::Reference;
            } else {
                qWarning() << "Invalid argument mode found:" << mode;
                acceptCurrentFunctionInCore = false;
            }

            qLegacySpecParserDebug() << "    argument:" << arg.type << arg.name;
            currentFunction.arguments.append(arg);

        } else if (returnRegExp.indexIn(line) != -1) {
            // Lookup the return type from the typemap
            QString returnTypeKey = returnRegExp.cap(1).simplified();
            if (!m_typeMap.contains(returnTypeKey)) {
                qWarning() << "Unknown return type found:" << returnTypeKey;
                acceptCurrentFunctionInCore = false;
            }
            QString returnType = m_typeMap.value(returnTypeKey);
            qLegacySpecParserDebug() << "    return type:" << returnType;
            currentFunction.returnType = returnType;

        } else if (versionRegExp.indexIn(line) != -1 && !haveVersionInfo) { // Only use version line if no other source
            // Extract the OpenGL version in which this function was introduced
            QString version = versionRegExp.cap(1);
            qLegacySpecParserDebug() << "    version:" << version;
            QStringList parts = version.split(QLatin1Char('.'));
            if (parts.size() != 2) {
                qWarning() << "Found invalid version number";
                continue;
            }
            int majorVersion = parts.first().toInt();
            int minorVersion = parts.last().toInt();
            Version v;
            v.major = majorVersion;
            v.minor = minorVersion;
            currentVersionProfile.version = v;

        } else if (deprecatedRegExp.indexIn(line) != -1) {
            // Extract the OpenGL version in which this function was deprecated.
            // If it is OpenGL 3.1 then it must be a compatibility profile function
            QString deprecatedVersion = deprecatedRegExp.cap(1).simplified();
            if (deprecatedVersion == QLatin1String("3.1") && !inDeprecationException(currentFunction.name))
                currentVersionProfile.profile = VersionProfile::CompatibilityProfile;

        } else if (categoryRegExp.indexIn(line) != -1) {
            // Extract the category for this function
            QString category = categoryRegExp.cap(1).simplified();
            qLegacySpecParserDebug() << "    category:" << category;

            if (categoryVersionRegExp.indexIn(category) != -1) {
                // Use the version info in the category in preference to the version
                // entry as this is more applicable and consistent
                int majorVersion = categoryVersionRegExp.cap(1).toInt();
                int minorVersion = categoryVersionRegExp.cap(2).toInt();

                Version v;
                v.major = majorVersion;
                v.minor = minorVersion;
                currentVersionProfile.version = v;
                haveVersionInfo = true;

            } else {
                // Make a note of the extension name and tag this function as being part of an extension
                qLegacySpecParserDebug() << "Found category =" << category;
                currentCategory = category;
                acceptCurrentFunctionInExtension = true;

                // See if this category (extension) is in our set of extensions that
                // have now been folded into the core feature set
                if (extensionsNowInCore.contains(category)) {
                    currentVersionProfile.version = extensionsNowInCore.value(category);
                    haveVersionInfo = true;
                } else {
                    acceptCurrentFunctionInCore = false;
                }
            }

        } else if (extToCoreVersionRegExp.indexIn(line) != -1) {
            qLegacySpecParserDebug() << line;
            int majorVersion = extToCoreVersionRegExp.cap(1).toInt();
            int minorVersion = extToCoreVersionRegExp.cap(2).toInt();
            extToCoreCurrentVersion.major = majorVersion;
            extToCoreCurrentVersion.minor = minorVersion;

        } else if (extToCoreRegExp.indexIn(line) != -1) {
            QString extension = extToCoreRegExp.cap(1);
            extensionsNowInCore.insert(extension, extToCoreCurrentVersion);
        }
    }

    m_versions = versions.toList();
    qSort(m_versions);
}

bool LegacySpecParser::inDeprecationException(const QString &functionName) const
{
    return functionName == QLatin1String("TexImage3D");
}