summaryrefslogtreecommitdiff
path: root/Source/cmDependsC.cxx
blob: a252a1ab757075a95816e96b9dca04694f5d42b8 (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
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/
#include "cmDependsC.h"

#include "cmFileTimeComparison.h"
#include "cmLocalGenerator.h"
#include "cmMakefile.h"
#include "cmSystemTools.h"

#include <ctype.h> // isspace


#define INCLUDE_REGEX_LINE \
  "^[ \t]*#[ \t]*(include|import)[ \t]*[<\"]([^\">]+)([\">])"

#define INCLUDE_REGEX_LINE_MARKER "#IncludeRegexLine: "
#define INCLUDE_REGEX_SCAN_MARKER "#IncludeRegexScan: "
#define INCLUDE_REGEX_COMPLAIN_MARKER "#IncludeRegexComplain: "
#define INCLUDE_REGEX_TRANSFORM_MARKER "#IncludeRegexTransform: "

//----------------------------------------------------------------------------
cmDependsC::cmDependsC()
: ValidDeps(0)
{
}

//----------------------------------------------------------------------------
cmDependsC::cmDependsC(cmLocalGenerator* lg,
                   const char* targetDir,
                   const char* lang,
                   const std::map<std::string, DependencyVector>* validDeps)
: cmDepends(lg, targetDir)
, ValidDeps(validDeps)
{
  cmMakefile* mf = lg->GetMakefile();

  // Configure the include file search path.
  this->SetIncludePathFromLanguage(lang);

  // Configure regular expressions.
  std::string scanRegex = "^.*$";
  std::string complainRegex = "^$";
  {
  std::string scanRegexVar = "CMAKE_";
  scanRegexVar += lang;
  scanRegexVar += "_INCLUDE_REGEX_SCAN";
  if(const char* sr = mf->GetDefinition(scanRegexVar.c_str()))
    {
    scanRegex = sr;
    }
  std::string complainRegexVar = "CMAKE_";
  complainRegexVar += lang;
  complainRegexVar += "_INCLUDE_REGEX_COMPLAIN";
  if(const char* cr = mf->GetDefinition(complainRegexVar.c_str()))
    {
    complainRegex = cr;
    }
  }

  this->IncludeRegexLine.compile(INCLUDE_REGEX_LINE);
  this->IncludeRegexScan.compile(scanRegex.c_str());
  this->IncludeRegexComplain.compile(complainRegex.c_str());
  this->IncludeRegexLineString = INCLUDE_REGEX_LINE_MARKER INCLUDE_REGEX_LINE;
  this->IncludeRegexScanString = INCLUDE_REGEX_SCAN_MARKER;
  this->IncludeRegexScanString += scanRegex;
  this->IncludeRegexComplainString = INCLUDE_REGEX_COMPLAIN_MARKER;
  this->IncludeRegexComplainString += complainRegex;

  this->SetupTransforms();

  this->CacheFileName = this->TargetDirectory;
  this->CacheFileName += "/";
  this->CacheFileName += lang;
  this->CacheFileName += ".includecache";

  this->ReadCacheFile();
}

//----------------------------------------------------------------------------
cmDependsC::~cmDependsC()
{
  this->WriteCacheFile();

  for (std::map<cmStdString, cmIncludeLines*>::iterator it=
         this->FileCache.begin(); it!=this->FileCache.end(); ++it)
    {
    delete it->second;
    }
}

//----------------------------------------------------------------------------
bool cmDependsC::WriteDependencies(const std::set<std::string>& sources,
                                   const std::string& obj,
                                   std::ostream& makeDepends,
                                   std::ostream& internalDepends)
{
  // Make sure this is a scanning instance.
  if(sources.empty() || sources.begin()->empty())
    {
    cmSystemTools::Error("Cannot scan dependencies without a source file.");
    return false;
    }
  if(obj.empty())
    {
    cmSystemTools::Error("Cannot scan dependencies without an object file.");
    return false;
    }

  std::set<cmStdString> dependencies;
  bool haveDeps = false;

  if (this->ValidDeps != 0)
    {
    std::map<std::string, DependencyVector>::const_iterator tmpIt =
                                                    this->ValidDeps->find(obj);
    if (tmpIt!= this->ValidDeps->end())
      {
      for(DependencyVector::const_iterator i=tmpIt->second.begin();
         i != tmpIt->second.end(); ++i)
        {
        dependencies.insert(*i);
        }
      haveDeps = true;
      }
    }

  if (!haveDeps)
    {
    // Walk the dependency graph starting with the source file.
    int srcFiles = (int)sources.size();
    this->Encountered.clear();

    for(std::set<std::string>::const_iterator srcIt = sources.begin();
        srcIt != sources.end(); ++srcIt)
      {
      UnscannedEntry root;
      root.FileName = *srcIt;
      this->Unscanned.push(root);
      this->Encountered.insert(*srcIt);
      }

    std::set<cmStdString> scanned;

    // Use reserve to allocate enough memory for tempPathStr
    // so that during the loops no memory is allocated or freed
    std::string tempPathStr;
    tempPathStr.reserve(4*1024);

    while(!this->Unscanned.empty())
      {
      // Get the next file to scan.
      UnscannedEntry current = this->Unscanned.front();
      this->Unscanned.pop();

      // If not a full path, find the file in the include path.
      std::string fullName;
      if((srcFiles>0)
         || cmSystemTools::FileIsFullPath(current.FileName.c_str()))
        {
        if(cmSystemTools::FileExists(current.FileName.c_str(), true))
          {
          fullName = current.FileName;
          }
        }
      else if(!current.QuotedLocation.empty() &&
              cmSystemTools::FileExists(current.QuotedLocation.c_str(), true))
        {
        // The include statement producing this entry was a double-quote
        // include and the included file is present in the directory of
        // the source containing the include statement.
        fullName = current.QuotedLocation;
        }
      else
        {
        std::map<cmStdString, cmStdString>::iterator
          headerLocationIt=this->HeaderLocationCache.find(current.FileName);
        if (headerLocationIt!=this->HeaderLocationCache.end())
          {
          fullName=headerLocationIt->second;
          }
        else for(std::vector<std::string>::const_iterator i =
              this->IncludePath.begin(); i != this->IncludePath.end(); ++i)
          {
          // Construct the name of the file as if it were in the current
          // include directory.  Avoid using a leading "./".

          tempPathStr =
            cmSystemTools::CollapseCombinedPath(*i, current.FileName);

          // Look for the file in this location.
          if(cmSystemTools::FileExists(tempPathStr.c_str(), true))
            {
            fullName = tempPathStr;
            HeaderLocationCache[current.FileName]=fullName;
            break;
            }
          }
        }

      // Complain if the file cannot be found and matches the complain
      // regex.
      if(fullName.empty() &&
        this->IncludeRegexComplain.find(current.FileName.c_str()))
        {
        cmSystemTools::Error("Cannot find file \"",
                            current.FileName.c_str(), "\".");
        return false;
        }

      // Scan the file if it was found and has not been scanned already.
      if(!fullName.empty() && (scanned.find(fullName) == scanned.end()))
        {
        // Record scanned files.
        scanned.insert(fullName);

        // Check whether this file is already in the cache
        std::map<cmStdString, cmIncludeLines*>::iterator fileIt=
          this->FileCache.find(fullName);
        if (fileIt!=this->FileCache.end())
          {
          fileIt->second->Used=true;
          dependencies.insert(fullName);
          for (std::vector<UnscannedEntry>::const_iterator incIt=
                fileIt->second->UnscannedEntries.begin();
              incIt!=fileIt->second->UnscannedEntries.end(); ++incIt)
            {
            if (this->Encountered.find(incIt->FileName) ==
                this->Encountered.end())
              {
              this->Encountered.insert(incIt->FileName);
              this->Unscanned.push(*incIt);
              }
            }
          }
        else
          {

          // Try to scan the file.  Just leave it out if we cannot find
          // it.
          std::ifstream fin(fullName.c_str());
          if(fin)
            {
            // Add this file as a dependency.
            dependencies.insert(fullName);

            // Scan this file for new dependencies.  Pass the directory
            // containing the file to handle double-quote includes.
            std::string dir = cmSystemTools::GetFilenamePath(fullName);
            this->Scan(fin, dir.c_str(), fullName);
            }
          }
        }

      srcFiles--;
      }
    }

  // Write the dependencies to the output stream.  Makefile rules
  // written by the original local generator for this directory
  // convert the dependencies to paths relative to the home output
  // directory.  We must do the same here.
  internalDepends << obj << std::endl;
  for(std::set<cmStdString>::const_iterator i=dependencies.begin();
      i != dependencies.end(); ++i)
    {
    makeDepends << obj << ": " <<
      this->LocalGenerator->Convert(i->c_str(),
                                    cmLocalGenerator::HOME_OUTPUT,
                                    cmLocalGenerator::MAKEFILE)
                << std::endl;
    internalDepends << " " << i->c_str() << std::endl;
    }
  makeDepends << std::endl;

  return true;
}

//----------------------------------------------------------------------------
void cmDependsC::ReadCacheFile()
{
  if(this->CacheFileName.size() == 0)
    {
    return;
    }
  std::ifstream fin(this->CacheFileName.c_str());
  if(!fin)
    {
    return;
    }

  std::string line;
  cmIncludeLines* cacheEntry=0;
  bool haveFileName=false;

  while(cmSystemTools::GetLineFromStream(fin, line))
    {
    if (line.empty())
      {
      cacheEntry=0;
      haveFileName=false;
      continue;
      }
    //the first line after an empty line is the name of the parsed file
    if (haveFileName==false)
      {
      haveFileName=true;
      int newer=0;
      cmFileTimeComparison comp;
      bool res=comp.FileTimeCompare(this->CacheFileName.c_str(),
                                    line.c_str(), &newer);

      if ((res==true) && (newer==1)) //cache is newer than the parsed file
        {
        cacheEntry=new cmIncludeLines;
        this->FileCache[line]=cacheEntry;
        }
      // file doesn't exist, check that the regular expressions
      // haven't changed
      else if (res==false)
        {
        if (line.find(INCLUDE_REGEX_LINE_MARKER) == 0)
          {
          if (line != this->IncludeRegexLineString)
            {
            return;
            }
          }
        else if (line.find(INCLUDE_REGEX_SCAN_MARKER) == 0)
          {
          if (line != this->IncludeRegexScanString)
            {
            return;
            }
          }
        else if (line.find(INCLUDE_REGEX_COMPLAIN_MARKER) == 0)
          {
          if (line != this->IncludeRegexComplainString)
            {
            return;
            }
          }
        else if (line.find(INCLUDE_REGEX_TRANSFORM_MARKER) == 0)
          {
          if (line != this->IncludeRegexTransformString)
            {
            return;
            }
          }
        }
      }
    else if (cacheEntry!=0)
      {
      UnscannedEntry entry;
      entry.FileName = line;
      if (cmSystemTools::GetLineFromStream(fin, line))
        {
        if (line!="-")
          {
          entry.QuotedLocation=line;
          }
        cacheEntry->UnscannedEntries.push_back(entry);
        }
      }
    }
}

//----------------------------------------------------------------------------
void cmDependsC::WriteCacheFile() const
{
  if(this->CacheFileName.size() == 0)
    {
    return;
    }
  std::ofstream cacheOut(this->CacheFileName.c_str());
  if(!cacheOut)
    {
    return;
    }

  cacheOut << this->IncludeRegexLineString << "\n\n";
  cacheOut << this->IncludeRegexScanString << "\n\n";
  cacheOut << this->IncludeRegexComplainString << "\n\n";
  cacheOut << this->IncludeRegexTransformString << "\n\n";

  for (std::map<cmStdString, cmIncludeLines*>::const_iterator fileIt=
         this->FileCache.begin();
       fileIt!=this->FileCache.end(); ++fileIt)
    {
    if (fileIt->second->Used)
      {
      cacheOut<<fileIt->first.c_str()<<std::endl;

      for (std::vector<UnscannedEntry>::const_iterator
             incIt=fileIt->second->UnscannedEntries.begin();
           incIt!=fileIt->second->UnscannedEntries.end(); ++incIt)
        {
        cacheOut<<incIt->FileName.c_str()<<std::endl;
        if (incIt->QuotedLocation.empty())
          {
          cacheOut<<"-"<<std::endl;
          }
        else
          {
          cacheOut<<incIt->QuotedLocation.c_str()<<std::endl;
          }
        }
      cacheOut<<std::endl;
      }
   }
}

//----------------------------------------------------------------------------
void cmDependsC::Scan(std::istream& is, const char* directory,
  const cmStdString& fullName)
{
  cmIncludeLines* newCacheEntry=new cmIncludeLines;
  newCacheEntry->Used=true;
  this->FileCache[fullName]=newCacheEntry;

  // Read one line at a time.
  std::string line;
  while(cmSystemTools::GetLineFromStream(is, line))
    {
    // Transform the line content first.
    if(!this->TransformRules.empty())
      {
      this->TransformLine(line);
      }

    // Match include directives.
    if(this->IncludeRegexLine.find(line.c_str()))
      {
      // Get the file being included.
      UnscannedEntry entry;
      entry.FileName = this->IncludeRegexLine.match(2);
      cmSystemTools::ConvertToUnixSlashes(entry.FileName);
      if(this->IncludeRegexLine.match(3) == "\"" &&
         !cmSystemTools::FileIsFullPath(entry.FileName.c_str()))
        {
        // This was a double-quoted include with a relative path.  We
        // must check for the file in the directory containing the
        // file we are scanning.
        entry.QuotedLocation =
          cmSystemTools::CollapseCombinedPath(directory, entry.FileName);
        }

      // Queue the file if it has not yet been encountered and it
      // matches the regular expression for recursive scanning.  Note
      // that this check does not account for the possibility of two
      // headers with the same name in different directories when one
      // is included by double-quotes and the other by angle brackets.
      // It also does not work properly if two header files with the same
      // name exist in different directories, and both are included from a
      // file their own directory by simply using "filename.h" (#12619)
      // This kind of problem will be fixed when a more
      // preprocessor-like implementation of this scanner is created.
      if (this->IncludeRegexScan.find(entry.FileName.c_str()))
        {
        newCacheEntry->UnscannedEntries.push_back(entry);
        if(this->Encountered.find(entry.FileName) == this->Encountered.end())
          {
          this->Encountered.insert(entry.FileName);
          this->Unscanned.push(entry);
          }
        }
      }
    }
}

//----------------------------------------------------------------------------
void cmDependsC::SetupTransforms()
{
  // Get the transformation rules.
  std::vector<std::string> transformRules;
  cmMakefile* mf = this->LocalGenerator->GetMakefile();
  if(const char* xform =
     mf->GetDefinition("CMAKE_INCLUDE_TRANSFORMS"))
    {
    cmSystemTools::ExpandListArgument(xform, transformRules, true);
    }
  for(std::vector<std::string>::const_iterator tri = transformRules.begin();
      tri != transformRules.end(); ++tri)
    {
    this->ParseTransform(*tri);
    }

  this->IncludeRegexTransformString = INCLUDE_REGEX_TRANSFORM_MARKER;
  if(!this->TransformRules.empty())
    {
    // Construct the regular expression to match lines to be
    // transformed.
    std::string xform = "^([ \t]*#[ \t]*(include|import)[ \t]*)(";
    const char* sep = "";
    for(TransformRulesType::const_iterator tri = this->TransformRules.begin();
        tri != this->TransformRules.end(); ++tri)
      {
      xform += sep;
      xform += tri->first;
      sep = "|";
      }
    xform += ")[ \t]*\\(([^),]*)\\)";
    this->IncludeRegexTransform.compile(xform.c_str());

    // Build a string that encodes all transformation rules and will
    // change when rules are changed.
    this->IncludeRegexTransformString += xform;
    for(TransformRulesType::const_iterator tri = this->TransformRules.begin();
        tri != this->TransformRules.end(); ++tri)
      {
      this->IncludeRegexTransformString += " ";
      this->IncludeRegexTransformString += tri->first;
      this->IncludeRegexTransformString += "(%)=";
      this->IncludeRegexTransformString += tri->second;
      }
    }
}

//----------------------------------------------------------------------------
void cmDependsC::ParseTransform(std::string const& xform)
{
  // A transform rule is of the form SOME_MACRO(%)=value-with-%
  // We can simply separate with "(%)=".
  std::string::size_type pos = xform.find("(%)=");
  if(pos == xform.npos || pos == 0)
    {
    return;
    }
  std::string name = xform.substr(0, pos);
  std::string value = xform.substr(pos+4, xform.npos);
  this->TransformRules[name] = value;
}

//----------------------------------------------------------------------------
void cmDependsC::TransformLine(std::string& line)
{
  // Check for a transform rule match.  Return if none.
  if(!this->IncludeRegexTransform.find(line.c_str()))
    {
    return;
    }
  TransformRulesType::const_iterator tri =
    this->TransformRules.find(this->IncludeRegexTransform.match(3));
  if(tri == this->TransformRules.end())
    {
    return;
    }

  // Construct the transformed line.
  std::string newline = this->IncludeRegexTransform.match(1);
  std::string arg = this->IncludeRegexTransform.match(4);
  for(const char* c = tri->second.c_str(); *c; ++c)
    {
    if(*c == '%')
      {
      newline += arg;
      }
    else
      {
      newline += *c;
      }
    }

  // Return the transformed line.
  line = newline;
}