summaryrefslogtreecommitdiffstats
path: root/Source/cmLoadCommandCommand.cxx
blob: 39e5684c6ff6f6d11007c13782a4a0cb61a9ccb7 (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
/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing for details.  */
#include "cmLoadCommandCommand.h"

#include "cmCPluginAPI.cxx"
#include "cmCPluginAPI.h"
#include "cmDynamicLoader.h"
#include "cmMakefile.h"
#include "cmPolicies.h"
#include "cmState.h"
#include "cmSystemTools.h"

class cmExecutionStatus;

#include <signal.h>
#include <sstream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef __QNX__
#include <malloc.h> /* for malloc/free on QNX */
#endif

extern "C" void TrapsForSignalsCFunction(int sig);

// a class for loadabple commands
class cmLoadedCommand : public cmCommand
{
public:
  cmLoadedCommand()
  {
    memset(&this->info, 0, sizeof(this->info));
    this->info.CAPI = &cmStaticCAPI;
  }

  ///! clean up any memory allocated by the plugin
  ~cmLoadedCommand() CM_OVERRIDE;

  /**
   * This is a virtual constructor for the command.
   */
  cmCommand* Clone() CM_OVERRIDE
  {
    cmLoadedCommand* newC = new cmLoadedCommand;
    // we must copy when we clone
    memcpy(&newC->info, &this->info, sizeof(info));
    return newC;
  }

  /**
   * This is called when the command is first encountered in
   * the CMakeLists.txt file.
   */
  bool InitialPass(std::vector<std::string> const& args,
                   cmExecutionStatus&) CM_OVERRIDE;

  /**
   * This is called at the end after all the information
   * specified by the command is accumulated. Most commands do
   * not implement this method.  At this point, reading and
   * writing to the cache can be done.
   */
  void FinalPass() CM_OVERRIDE;
  bool HasFinalPass() const CM_OVERRIDE
  {
    return this->info.FinalPass != CM_NULLPTR;
  }

  /**
   * The name of the command as specified in CMakeList.txt.
   */
  std::string GetName() const CM_OVERRIDE { return info.Name; }

  static const char* LastName;
  static void TrapsForSignals(int sig)
  {
    fprintf(stderr, "CMake loaded command %s crashed with signal: %d.\n",
            cmLoadedCommand::LastName, sig);
  }
  static void InstallSignalHandlers(const char* name, int remove = 0)
  {
    cmLoadedCommand::LastName = name;
    if (!name) {
      cmLoadedCommand::LastName = "????";
    }

    if (!remove) {
      signal(SIGSEGV, TrapsForSignalsCFunction);
#ifdef SIGBUS
      signal(SIGBUS, TrapsForSignalsCFunction);
#endif
      signal(SIGILL, TrapsForSignalsCFunction);
    } else {
      signal(SIGSEGV, CM_NULLPTR);
#ifdef SIGBUS
      signal(SIGBUS, CM_NULLPTR);
#endif
      signal(SIGILL, CM_NULLPTR);
    }
  }

  cmLoadedCommandInfo info;
};

extern "C" void TrapsForSignalsCFunction(int sig)
{
  cmLoadedCommand::TrapsForSignals(sig);
}

const char* cmLoadedCommand::LastName = CM_NULLPTR;

bool cmLoadedCommand::InitialPass(std::vector<std::string> const& args,
                                  cmExecutionStatus&)
{
  if (!info.InitialPass) {
    return true;
  }

  // clear the error string
  if (this->info.Error) {
    free(this->info.Error);
  }

  // create argc and argv and then invoke the command
  int argc = static_cast<int>(args.size());
  char** argv = CM_NULLPTR;
  if (argc) {
    argv = (char**)malloc(argc * sizeof(char*));
  }
  int i;
  for (i = 0; i < argc; ++i) {
    argv[i] = strdup(args[i].c_str());
  }
  cmLoadedCommand::InstallSignalHandlers(info.Name);
  int result =
    info.InitialPass((void*)&info, (void*)this->Makefile, argc, argv);
  cmLoadedCommand::InstallSignalHandlers(info.Name, 1);
  cmFreeArguments(argc, argv);

  if (result) {
    return true;
  }

  /* Initial Pass must have failed so set the error string */
  if (this->info.Error) {
    this->SetError(this->info.Error);
  }
  return false;
}

void cmLoadedCommand::FinalPass()
{
  if (this->info.FinalPass) {
    cmLoadedCommand::InstallSignalHandlers(info.Name);
    this->info.FinalPass((void*)&this->info, (void*)this->Makefile);
    cmLoadedCommand::InstallSignalHandlers(info.Name, 1);
  }
}

cmLoadedCommand::~cmLoadedCommand()
{
  if (this->info.Destructor) {
    cmLoadedCommand::InstallSignalHandlers(info.Name);
    this->info.Destructor((void*)&this->info);
    cmLoadedCommand::InstallSignalHandlers(info.Name, 1);
  }
  if (this->info.Error) {
    free(this->info.Error);
  }
}

// cmLoadCommandCommand
bool cmLoadCommandCommand::InitialPass(std::vector<std::string> const& args,
                                       cmExecutionStatus&)
{
  if (args.empty()) {
    return true;
  }

  // Construct a variable to report what file was loaded, if any.
  // Start by removing the definition in case of failure.
  std::string reportVar = "CMAKE_LOADED_COMMAND_";
  reportVar += args[0];
  this->Makefile->RemoveDefinition(reportVar);

  // the file must exist
  std::string moduleName =
    this->Makefile->GetRequiredDefinition("CMAKE_SHARED_MODULE_PREFIX");
  moduleName += "cm" + args[0];
  moduleName +=
    this->Makefile->GetRequiredDefinition("CMAKE_SHARED_MODULE_SUFFIX");

  // search for the file
  std::vector<std::string> path;
  for (unsigned int j = 1; j < args.size(); j++) {
    // expand variables
    std::string exp = args[j];
    cmSystemTools::ExpandRegistryValues(exp);

    // Glob the entry in case of wildcards.
    cmSystemTools::GlobDirs(exp, path);
  }

  // Try to find the program.
  std::string fullPath = cmSystemTools::FindFile(moduleName, path);
  if (fullPath == "") {
    std::ostringstream e;
    e << "Attempt to load command failed from file \"" << moduleName << "\"";
    this->SetError(e.str());
    return false;
  }

  // try loading the shared library / dll
  cmsys::DynamicLoader::LibraryHandle lib =
    cmDynamicLoader::OpenLibrary(fullPath.c_str());
  if (!lib) {
    std::string err = "Attempt to load the library ";
    err += fullPath + " failed.";
    const char* error = cmsys::DynamicLoader::LastError();
    if (error) {
      err += " Additional error info is:\n";
      err += error;
    }
    this->SetError(err);
    return false;
  }

  // Report what file was loaded for this command.
  this->Makefile->AddDefinition(reportVar, fullPath.c_str());

  // find the init function
  std::string initFuncName = args[0] + "Init";
  CM_INIT_FUNCTION initFunction =
    (CM_INIT_FUNCTION)cmsys::DynamicLoader::GetSymbolAddress(lib,
                                                             initFuncName);
  if (!initFunction) {
    initFuncName = "_";
    initFuncName += args[0];
    initFuncName += "Init";
    initFunction = (CM_INIT_FUNCTION)(
      cmsys::DynamicLoader::GetSymbolAddress(lib, initFuncName));
  }
  // if the symbol is found call it to set the name on the
  // function blocker
  if (initFunction) {
    // create a function blocker and set it up
    cmLoadedCommand* f = new cmLoadedCommand();
    (*initFunction)(&f->info);
    this->Makefile->GetState()->AddCommand(f);
    return true;
  }
  this->SetError("Attempt to load command failed. "
                 "No init function found.");
  return false;
}