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88 lines
2.9 KiB
88 lines
2.9 KiB
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#include "cmVariableWatch.h"
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#include <memory>
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#include <utility>
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#include <vector>
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static const char* const cmVariableWatchAccessStrings[] = {
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"READ_ACCESS", "UNKNOWN_READ_ACCESS", "UNKNOWN_DEFINED_ACCESS",
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"MODIFIED_ACCESS", "REMOVED_ACCESS", "NO_ACCESS"
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};
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const char* cmVariableWatch::GetAccessAsString(int access_type)
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{
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if (access_type < 0 || access_type >= cmVariableWatch::NO_ACCESS) {
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return "NO_ACCESS";
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}
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return cmVariableWatchAccessStrings[access_type];
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}
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cmVariableWatch::cmVariableWatch() = default;
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cmVariableWatch::~cmVariableWatch() = default;
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bool cmVariableWatch::AddWatch(const std::string& variable, WatchMethod method,
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void* client_data /*=0*/,
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DeleteData delete_data /*=0*/)
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{
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auto p = std::make_shared<cmVariableWatch::Pair>();
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p->Method = method;
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p->ClientData = client_data;
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p->DeleteDataCall = delete_data;
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cmVariableWatch::VectorOfPairs& vp = this->WatchMap[variable];
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for (auto& pair : vp) {
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if (pair->Method == method && client_data &&
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client_data == pair->ClientData) {
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// Callback already exists
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return false;
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}
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}
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vp.push_back(std::move(p));
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return true;
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}
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void cmVariableWatch::RemoveWatch(const std::string& variable,
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WatchMethod method, void* client_data /*=0*/)
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{
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if (!this->WatchMap.count(variable)) {
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return;
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}
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cmVariableWatch::VectorOfPairs* vp = &this->WatchMap[variable];
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cmVariableWatch::VectorOfPairs::iterator it;
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for (it = vp->begin(); it != vp->end(); ++it) {
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if ((*it)->Method == method &&
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// If client_data is NULL, we want to disconnect all watches against
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// the given method; otherwise match ClientData as well.
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(!client_data || (client_data == (*it)->ClientData))) {
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vp->erase(it);
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return;
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}
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}
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}
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bool cmVariableWatch::VariableAccessed(const std::string& variable,
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int access_type, const char* newValue,
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const cmMakefile* mf) const
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{
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cmVariableWatch::StringToVectorOfPairs::const_iterator mit =
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this->WatchMap.find(variable);
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if (mit != this->WatchMap.end()) {
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// The strategy here is to copy the list of callbacks, and ignore
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// new callbacks that existing ones may add.
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std::vector<std::weak_ptr<Pair>> vp(mit->second.begin(),
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mit->second.end());
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for (auto& weak_it : vp) {
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// In the case where a callback was removed, the weak_ptr will not be
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// lockable, and so this ensures we don't attempt to call into freed
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// memory
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if (auto it = weak_it.lock()) {
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it->Method(variable, access_type, it->ClientData, newValue, mf);
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}
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}
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return true;
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}
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return false;
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}
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