aboutsummaryrefslogtreecommitdiffstats
path: root/src/java/com/sun/gluegen/procaddress/ProcAddressEmitter.java
blob: 6b837c1f2edc22a12d4c66a768a4c896404964e3 (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
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
/*
 * Copyright (c) 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution 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 Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
 * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
 * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
 * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed or intended for use
 * in the design, construction, operation or maintenance of any nuclear
 * facility.
 * 
 * Sun gratefully acknowledges that this software was originally authored
 * and developed by Kenneth Bradley Russell and Christopher John Kline.
 */

package com.sun.gluegen.procaddress;

import java.io.*;
import java.text.MessageFormat;
import java.util.*;
import com.sun.gluegen.*;
import com.sun.gluegen.cgram.types.*;
import com.sun.gluegen.runtime.*;

/**
 * A subclass of JavaEmitter that modifies the normal emission of C
 * and Java code to allow dynamic lookups of the C entry points
 * associated with the Java methods.
 */

public class ProcAddressEmitter extends JavaEmitter
{
  public static final String PROCADDRESS_VAR_PREFIX = ProcAddressHelper.PROCADDRESS_VAR_PREFIX;
  protected static final String WRAP_PREFIX = "dispatch_";
  private TypeDictionary typedefDictionary;
  protected PrintWriter tableWriter;
  protected Set emittedTableEntries;
  protected String tableClassPackage;
  protected String tableClassName;

  public void beginFunctions(TypeDictionary typedefDictionary,
                             TypeDictionary structDictionary,
                             Map            canonMap) throws Exception
  {
    this.typedefDictionary = typedefDictionary;

    if (getProcAddressConfig().emitProcAddressTable())
    {
      beginProcAddressTable();
    }
    super.beginFunctions(typedefDictionary, structDictionary, canonMap);
  }

  public void endFunctions() throws Exception
  {
    if (getProcAddressConfig().emitProcAddressTable())
    {
      endProcAddressTable();
    }
    super.endFunctions();
  }
  
  public void beginStructs(TypeDictionary typedefDictionary,
                           TypeDictionary structDictionary,
                           Map            canonMap) throws Exception {
    super.beginStructs(typedefDictionary, structDictionary, canonMap);
  }

  public String runtimeExceptionType() {
    return getConfig().runtimeExceptionType();
  }

  protected JavaConfiguration createConfig() {
    return new ProcAddressConfiguration();
  }

  protected List generateMethodBindingEmitters(FunctionSymbol sym) throws Exception
  {
    return generateMethodBindingEmittersImpl(sym);
  }

  protected boolean needsModifiedEmitters(FunctionSymbol sym) {
    if (!needsProcAddressWrapper(sym) ||
        getConfig().isUnimplemented(sym.getName())) {
      return false;
    }

    return true;
  }

  private List generateMethodBindingEmittersImpl(FunctionSymbol sym) throws Exception
  {
    List defaultEmitters = super.generateMethodBindingEmitters(sym);

    // if the superclass didn't generate any bindings for the symbol, let's
    // honor that (for example, the superclass might have caught an Ignore
    // direction that matched the symbol's name).
    if (defaultEmitters.isEmpty())
    {
      return defaultEmitters;
    }
    
    // Don't do anything special if this symbol doesn't require
    // modifications
    if (!needsModifiedEmitters(sym))
    {
      return defaultEmitters;
    }

    ArrayList modifiedEmitters = new ArrayList(defaultEmitters.size());

    if (needsProcAddressWrapper(sym)) {
      if (getProcAddressConfig().emitProcAddressTable()) {
        // emit an entry in the GL proc address table for this method.
        emitProcAddressTableEntryForSymbol(sym);
      }
    }
    
    for (Iterator iter = defaultEmitters.iterator(); iter.hasNext(); )
    {
      FunctionEmitter emitter = (FunctionEmitter) iter.next();
      if (emitter instanceof JavaMethodBindingEmitter)
      {
        generateModifiedEmitters((JavaMethodBindingEmitter) emitter, modifiedEmitters);
      }
      else if (emitter instanceof CMethodBindingEmitter)
      {
        generateModifiedEmitters((CMethodBindingEmitter) emitter, modifiedEmitters);
      }
      else
      {
        throw new RuntimeException("Unexpected emitter type: " +
                                   emitter.getClass().getName());
      }
    }
    
    return modifiedEmitters;
  }

  /**
   * Returns the name of the typedef for a pointer to the function
   * represented by the argument as defined by the ProcAddressNameExpr
   * in the .cfg file. For example, in the OpenGL headers, if the
   * argument is the function "glFuncName", the value returned will be
   * "PFNGLFUNCNAMEPROC". This returns a valid string regardless of
   * whether or not the typedef is actually defined.
   */
  protected String getFunctionPointerTypedefName(FunctionSymbol sym) {
    return getProcAddressConfig().convertToFunctionPointerName(sym.getName());
  }

  //----------------------------------------------------------------------
  // Internals only below this point
  //
  
  protected void generateModifiedEmitters(JavaMethodBindingEmitter baseJavaEmitter, List emitters) {
    if (getConfig().manuallyImplement(baseJavaEmitter.getName())) {
      // User will provide Java-side implementation of this routine;
      // pass through any emitters which will produce signatures for
      // it unmodified
      emitters.add(baseJavaEmitter);
      return;
    }
    
    // See whether we need a proc address entry for this one
    boolean callThroughProcAddress = needsProcAddressWrapper(baseJavaEmitter.getBinding().getCSymbol());

    ProcAddressJavaMethodBindingEmitter emitter =
      new ProcAddressJavaMethodBindingEmitter(baseJavaEmitter,
                                              callThroughProcAddress,
                                              getProcAddressConfig().getProcAddressTableExpr(),
                                              baseJavaEmitter.isForImplementingMethodCall(),
                                              this);
    emitters.add(emitter);

    // If this emitter doesn't have a body (i.e., is a direct native
    // call with no intervening argument processing), we need to force
    // it to emit a body, and produce another one to act as the entry
    // point
    // FIXME: the negative test against the PRIVATE modifier is a
    // nasty hack to prevent the ProcAddressJavaMethodBindingEmitter
    // from incorrectly introducing method bodies to the private
    // native implementing methods; want this to work at least for
    // public and package-private methods
    if (baseJavaEmitter.signatureOnly() &&
        !baseJavaEmitter.hasModifier(JavaMethodBindingEmitter.PRIVATE) &&
        baseJavaEmitter.hasModifier(JavaMethodBindingEmitter.NATIVE) &&
        callThroughProcAddress) {
      emitter.setEmitBody(true);
      emitter.removeModifier(JavaMethodBindingEmitter.NATIVE);
      emitter = new ProcAddressJavaMethodBindingEmitter(baseJavaEmitter,
                                                        callThroughProcAddress,
                                                        getProcAddressConfig().getProcAddressTableExpr(),
                                                        true,
                                                        this);
      emitter.setForImplementingMethodCall(true);
      emitters.add(emitter);
    }
  }

  protected void generateModifiedEmitters(CMethodBindingEmitter baseCEmitter, List emitters)
  {    
    // See whether we need a proc address entry for this one
    boolean callThroughProcAddress = needsProcAddressWrapper(baseCEmitter.getBinding().getCSymbol());
    boolean forceProcAddress       = getProcAddressConfig().forceProcAddressGen(baseCEmitter.getBinding().getCSymbol().getName());
    // Note that we don't care much about the naming of the C argument
    // variables so to keep things simple we ignore the buffer object
    // property for the binding

    // The C-side JNI binding for this particular function will have an
    // extra final argument, which is the address (the OpenGL procedure
    // address) of the function it needs to call
    ProcAddressCMethodBindingEmitter res = new ProcAddressCMethodBindingEmitter(baseCEmitter,
                                                                                callThroughProcAddress,
                                                                                forceProcAddress,
                                                                                this);
    MessageFormat exp = baseCEmitter.getReturnValueCapacityExpression();
    if (exp != null) {
      res.setReturnValueCapacityExpression(exp);
    }
    emitters.add(res);
  }
    
  protected boolean needsProcAddressWrapper(FunctionSymbol sym)
  {
    String symName =  sym.getName();

    ProcAddressConfiguration config = getProcAddressConfig();

    // We should only generate code to call through a function pointer
    // if the symbol has an associated function pointer typedef.
    String funcPointerTypedefName = getFunctionPointerTypedefName(sym);
    boolean shouldWrap = typedefDictionary.containsKey(funcPointerTypedefName);
    //System.err.println(funcPointerTypedefName + " defined: " + shouldWrap);      

    if (config.skipProcAddressGen(symName)) {
      shouldWrap = false;
    }
    
    if (config.forceProcAddressGen(symName)) {
      shouldWrap = true;
    }
    
    if (shouldWrap)
    {
      // Hoist argument names from function pointer if not supplied in prototype
      Type funcPointerType = typedefDictionary.get(funcPointerTypedefName);
      if (funcPointerType != null) {
        FunctionType typedef = funcPointerType.asPointer().getTargetType().asFunction();
        FunctionType fun = sym.getType();
        int numarg = typedef.getNumArguments();
        for (int i =0; i < numarg; i++) {
          if (fun.getArgumentName(i) == null)
            fun.setArgumentName(i,typedef.getArgumentName(i));
          }
      }
    }
    
    return shouldWrap;
  }

  protected void beginProcAddressTable() throws Exception
  {
    tableClassPackage = getProcAddressConfig().tableClassPackage();
    tableClassName    = getProcAddressConfig().tableClassName();

    // Table defaults to going into the impl directory unless otherwise overridden
    String implPackageName = tableClassPackage;
    if (implPackageName == null) {
      implPackageName = getImplPackageName();
    }
    String jImplRoot =
      getJavaOutputDir() + File.separator +
      CodeGenUtils.packageAsPath(implPackageName);

    tableWriter = openFile(jImplRoot + File.separator + tableClassName + ".java");
    emittedTableEntries = new HashSet();

    CodeGenUtils.emitAutogeneratedWarning(tableWriter, this);
    
    tableWriter.println("package " + implPackageName + ";");
    tableWriter.println();
    for (Iterator iter = getConfig().imports().iterator(); iter.hasNext(); ) {
      tableWriter.println("import " + ((String) iter.next()) + ";");
    }
    tableWriter.println();

    tableWriter.println("/**");
    tableWriter.println(" * This table is a cache of pointers to the dynamically-linkable C");
    tableWriter.println(" * functions this autogenerated Java binding has exposed. Some");
    tableWriter.println(" * libraries such as OpenGL, OpenAL and others define function pointer");
    tableWriter.println(" * signatures rather than statically linkable entry points for the");
    tableWriter.println(" * purposes of being able to query at run-time whether a particular");
    tableWriter.println(" * extension is available. This table acts as a cache of these");
    tableWriter.println(" * function pointers. Each function pointer is typically looked up at");
    tableWriter.println(" * run-time by a platform-dependent mechanism such as dlsym(),");
    tableWriter.println(" * wgl/glXGetProcAddress(), or alGetProcAddress(). The associated");
    tableWriter.println(" * autogenerated Java and C code accesses the fields in this table to");
    tableWriter.println(" * call the various functions. If the field containing the function");
    tableWriter.println(" * pointer is 0, the function is considered to be unavailable and can");
    tableWriter.println(" * not be called.");
    tableWriter.println(" */");
    tableWriter.println("public class " + tableClassName + " implements com.sun.gluegen.runtime.ProcAddressTable");
    tableWriter.println("{");

    for (Iterator iter = getProcAddressConfig().getForceProcAddressGen().iterator(); iter.hasNext(); ) {
      emitProcAddressTableEntryForString((String) iter.next());
    }
  }

  protected void endProcAddressTable() throws Exception
  {
    PrintWriter w = tableWriter;

    w.println("  /**");
    w.println("   * This is a convenience method to get (by name) the native function");
    w.println("   * pointer for a given function. It lets you avoid having to");
    w.println("   * manually compute the &quot;" + PROCADDRESS_VAR_PREFIX + " + ");
    w.println("   * &lt;functionName&gt;&quot; member variable name and look it up via");
    w.println("   * reflection; it also will throw an exception if you try to get the");
    w.println("   * address of an unknown function, or one that is statically linked");
    w.println("   * and therefore does not have a function pointer in this table.");
    w.println("   *");
    w.println("   * @throws RuntimeException if the function pointer was not found in");
    w.println("   *   this table, either because the function was unknown or because");
    w.println("   *   it was statically linked.");
    w.println("   */");
    w.println("  public long getAddressFor(String functionName) {");
    w.println("    String addressFieldName = " + getProcAddressConfig().gluegenRuntimePackage() + ".ProcAddressHelper.PROCADDRESS_VAR_PREFIX + functionName;");
    w.println("    try { ");
    w.println("      java.lang.reflect.Field addressField = getClass().getField(addressFieldName);");
    w.println("      return addressField.getLong(this);");
    w.println("    } catch (Exception e) {");
    w.println("      // The user is calling a bogus function or one which is not");
    w.println("      // runtime linked");
    w.println("      throw new RuntimeException(");
    w.println("          \"WARNING: Address query failed for \\\"\" + functionName +");
    w.println("          \"\\\"; it's either statically linked or is not a known \" +");
    w.println("          \"function\", e);");
    w.println("    } ");
    w.println("  }");

    w.println("} // end of class " + tableClassName);
    w.flush();
    w.close();
  }

  protected void emitProcAddressTableEntryForSymbol(FunctionSymbol cFunc)
  {
    emitProcAddressTableEntryForString(cFunc.getName());
  }

  protected void emitProcAddressTableEntryForString(String str)
  {
    // Deal gracefully with forced proc address generation in the face
    // of having the function pointer typedef in the header file too
    if (emittedTableEntries.contains(str))
      return;
    emittedTableEntries.add(str);
    tableWriter.print("  public long ");
    tableWriter.print(PROCADDRESS_VAR_PREFIX);
    tableWriter.print(str);
    tableWriter.println(";");
  }

  protected ProcAddressConfiguration getProcAddressConfig() {
    return (ProcAddressConfiguration) getConfig();
  }
}