Revision 7486607c874de3e44d33f152775fd073de2ba2c0 authored by Brad King on 20 September 2017, 11:53:03 UTC, committed by Brad King on 20 September 2017, 11:53:03 UTC
1 parent 8dae0ab
cmLoadCommandCommand.cxx
/* 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 <signal.h>
#include <sstream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cmCPluginAPI.cxx"
#include "cmCPluginAPI.h"
#include "cmDynamicLoader.h"
#include "cmMakefile.h"
#include "cmState.h"
#include "cmSystemTools.h"
class cmExecutionStatus;
#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;
}
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()->AddScriptedCommand(args[0], f);
return true;
}
this->SetError("Attempt to load command failed. "
"No init function found.");
return false;
}
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