summaryrefslogtreecommitdiffstats
path: root/Source/cmDepends.cxx
blob: 69ff85843d7daf0148a4d257cd9f04885e7edbfa (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
/*============================================================================
  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 "cmDepends.h"

#include "cmLocalGenerator.h"
#include "cmMakefile.h"
#include "cmGeneratedFileStream.h"
#include "cmSystemTools.h"
#include "cmFileTimeComparison.h"
#include <string.h>

//----------------------------------------------------------------------------
cmDepends::cmDepends(cmLocalGenerator* lg, const char* targetDir):
  CompileDirectory(),
  LocalGenerator(lg),
  Verbose(false),
  FileComparison(0),
  TargetDirectory(targetDir),
  MaxPath(cmSystemTools::GetMaximumFilePathLength()),
  Dependee(new char[MaxPath]),
  Depender(new char[MaxPath])
{
}

//----------------------------------------------------------------------------
cmDepends::~cmDepends()
{
  delete [] this->Dependee;
  delete [] this->Depender;
}

//----------------------------------------------------------------------------
bool cmDepends::Write(std::ostream &makeDepends,
                      std::ostream &internalDepends)
{
  // Lookup the set of sources to scan.
  std::string srcLang = "CMAKE_DEPENDS_CHECK_";
  srcLang += this->Language;
  cmMakefile* mf = this->LocalGenerator->GetMakefile();
  const char* srcStr = mf->GetSafeDefinition(srcLang.c_str());
  std::vector<std::string> pairs;
  cmSystemTools::ExpandListArgument(srcStr, pairs);

  for(std::vector<std::string>::iterator si = pairs.begin();
      si != pairs.end();)
    {
    // Get the source and object file.
    std::string const& src = *si++;
    if(si == pairs.end()) { break; }
    std::string obj = *si++;

    // Make sure the object file is relative to the top of the build tree.
    obj = this->LocalGenerator->Convert(obj.c_str(),
                                        cmLocalGenerator::HOME_OUTPUT,
                                        cmLocalGenerator::MAKEFILE);

    // Write the dependencies for this pair.
    if(!this->WriteDependencies(src.c_str(), obj.c_str(),
                                makeDepends, internalDepends))
      {
      return false;
      }
    }

  return this->Finalize(makeDepends, internalDepends);
}

//----------------------------------------------------------------------------
bool cmDepends::Finalize(std::ostream&,
                         std::ostream&)
{
  return true;
}

//----------------------------------------------------------------------------
bool cmDepends::Check(const char *makeFile, const char *internalFile,
                      std::map<std::string, DependencyVector>& validDeps)
{
  // Dependency checks must be done in proper working directory.
  std::string oldcwd = ".";
  if(this->CompileDirectory != ".")
    {
    // Get the CWD but do not call CollapseFullPath because
    // we only need it to cd back, and the form does not matter
    oldcwd = cmSystemTools::GetCurrentWorkingDirectory(false);
    cmSystemTools::ChangeDirectory(this->CompileDirectory.c_str());
    }

  // Check whether dependencies must be regenerated.
  bool okay = true;
  std::ifstream fin(internalFile);
  if(!(fin && this->CheckDependencies(fin, validDeps)))
    {
    // Clear all dependencies so they will be regenerated.
    this->Clear(makeFile);
    cmSystemTools::RemoveFile(internalFile);
    okay = false;
    }

  // Restore working directory.
  if(oldcwd != ".")
    {
    cmSystemTools::ChangeDirectory(oldcwd.c_str());
    }

  return okay;
}

//----------------------------------------------------------------------------
void cmDepends::Clear(const char *file)
{
  // Print verbose output.
  if(this->Verbose)
    {
    cmOStringStream msg;
    msg << "Clearing dependencies in \"" << file << "\"." << std::endl;
    cmSystemTools::Stdout(msg.str().c_str());
    }

  // Write an empty dependency file.
  cmGeneratedFileStream depFileStream(file);
  depFileStream
    << "# Empty dependencies file\n"
    << "# This may be replaced when dependencies are built." << std::endl;
}

//----------------------------------------------------------------------------
bool cmDepends::WriteDependencies(const char*, const char*,
                                  std::ostream&, std::ostream&)
{
  // This should be implemented by the subclass.
  return false;
}

//----------------------------------------------------------------------------
bool cmDepends::CheckDependencies(std::istream& internalDepends,
                            std::map<std::string, DependencyVector>& validDeps)
{
  // Parse dependencies from the stream.  If any dependee is missing
  // or newer than the depender then dependencies should be
  // regenerated.
  bool okay = true;
  bool dependerExists = false;
  DependencyVector* currentDependencies = 0;

  while(internalDepends.getline(this->Dependee, this->MaxPath))
    {
    if ( this->Dependee[0] == 0 || this->Dependee[0] == '#' || 
         this->Dependee[0] == '\r' )
      {
      continue;
      }
    size_t len = internalDepends.gcount()-1;
    if ( this->Dependee[len-1] == '\r' )
      {
      len --;
      this->Dependee[len] = 0;
      }
    if ( this->Dependee[0] != ' ' )
      {
      memcpy(this->Depender, this->Dependee, len+1);
      // Calling FileExists() for the depender here saves in many cases 50%
      // of the calls to FileExists() further down in the loop. E.g. for
      // kdelibs/khtml this reduces the number of calls from 184k down to 92k,
      // or the time for cmake -E cmake_depends from 0.3 s down to 0.21 s.
      dependerExists = cmSystemTools::FileExists(this->Depender);
      DependencyVector tmp;
      validDeps[this->Depender] = tmp;
      currentDependencies = &validDeps[this->Depender];
      continue;
      }
    /*
    // Parse the dependency line.
    if(!this->ParseDependency(line.c_str()))
      {
      continue;
      }
      */

    // Dependencies must be regenerated if the dependee does not exist
    // or if the depender exists and is older than the dependee.
    bool regenerate = false;
    const char* dependee = this->Dependee+1;
    const char* depender = this->Depender;
    if (currentDependencies != 0)
      {
      currentDependencies->push_back(dependee);
      }

    if(!cmSystemTools::FileExists(dependee))
      {
      // The dependee does not exist.
      regenerate = true;

      // Print verbose output.
      if(this->Verbose)
        {
        cmOStringStream msg;
        msg << "Dependee \"" << dependee
            << "\" does not exist for depender \""
            << depender << "\"." << std::endl;
        cmSystemTools::Stdout(msg.str().c_str());
        }
      }
    else if(dependerExists)
      {
      // The dependee and depender both exist.  Compare file times.
      int result = 0;
      if((!this->FileComparison->FileTimeCompare(depender, dependee,
                                             &result) || result < 0))
        {
        // The depender is older than the dependee.
        regenerate = true;

        // Print verbose output.
        if(this->Verbose)
          {
          cmOStringStream msg;
          msg << "Dependee \"" << dependee
              << "\" is newer than depender \""
              << depender << "\"." << std::endl;
          cmSystemTools::Stdout(msg.str().c_str());
          }
        }
      }
    if(regenerate)
      {
      // Dependencies must be regenerated.
      okay = false;

      // Remove the information of this depender from the map, it needs
      // to be rescanned
      if (currentDependencies != 0)
        {
        validDeps.erase(this->Depender);
        currentDependencies = 0;
        }

      // Remove the depender to be sure it is rebuilt.
      if (dependerExists)
        {
        cmSystemTools::RemoveFile(depender);
        dependerExists = false;
        }
      }
    }

  return okay;
}

//----------------------------------------------------------------------------
void cmDepends::SetIncludePathFromLanguage(const char* lang)
{
  std::string includePathVar = "CMAKE_";
  includePathVar += lang;
  includePathVar += "_INCLUDE_PATH";
  cmMakefile* mf = this->LocalGenerator->GetMakefile();
  if(const char* includePath = mf->GetDefinition(includePathVar.c_str()))
    {
    cmSystemTools::ExpandListArgument(includePath, this->IncludePath);
    }
}