+/// @brief Base class for managing collections of named indirect stubs.
+class IndirectStubsManagerBase {
+public:
+
+ /// @brief Map type for initializing the manager. See init.
+ typedef StringMap<std::pair<TargetAddress, JITSymbolFlags>> StubInitsMap;
+
+ virtual ~IndirectStubsManagerBase() {}
+
+ /// @brief Create StubInits.size() stubs with the given names, target
+ /// addresses, and flags.
+ virtual std::error_code init(const StubInitsMap &StubInits) = 0;
+
+ /// @brief Find the stub with the given name. If ExportedStubsOnly is true,
+ /// this will only return a result if the stub's flags indicate that it
+ /// is exported.
+ virtual JITSymbol findStub(StringRef Name, bool ExportedStubsOnly) = 0;
+
+ /// @brief Find the implementation-pointer for the stub.
+ virtual JITSymbol findPointer(StringRef Name) = 0;
+
+ /// @brief Change the value of the implementation pointer for the stub.
+ virtual std::error_code updatePointer(StringRef Name, TargetAddress NewAddr) = 0;
+private:
+ virtual void anchor();
+};
+
+/// @brief IndirectStubsManager implementation for a concrete target, e.g. OrcX86_64.
+/// (See OrcTargetSupport.h).
+template <typename TargetT>
+class IndirectStubsManager : public IndirectStubsManagerBase {
+public:
+
+ std::error_code
+ init(const StubInitsMap &StubInits) override {
+ if (auto EC = TargetT::emitIndirectStubsBlock(IndirectStubsInfo,
+ StubInits.size(),
+ nullptr))
+ return EC;
+
+ unsigned I = 0;
+ for (auto &Entry : StubInits) {
+ *IndirectStubsInfo.getPtr(I) =
+ reinterpret_cast<void*>(static_cast<uintptr_t>(Entry.second.first));
+ StubIndexes[Entry.first()] = std::make_pair(I++, Entry.second.second);
+ }
+
+ return std::error_code();
+ }
+
+ JITSymbol findStub(StringRef Name, bool ExportedStubsOnly) override {
+ auto I = StubIndexes.find(Name);
+ if (I == StubIndexes.end())
+ return nullptr;
+ void *StubAddr = IndirectStubsInfo.getStub(I->second.first);
+ assert(StubAddr && "Missing stub address");
+ auto StubTargetAddr =
+ static_cast<TargetAddress>(reinterpret_cast<uintptr_t>(StubAddr));
+ auto StubSymbol = JITSymbol(StubTargetAddr, I->second.second);
+ if (ExportedStubsOnly && !StubSymbol.isExported())
+ return nullptr;
+ return StubSymbol;
+ }
+
+ JITSymbol findPointer(StringRef Name) override {
+ auto I = StubIndexes.find(Name);
+ if (I == StubIndexes.end())
+ return nullptr;
+ void *PtrAddr = IndirectStubsInfo.getPtr(StubIndexes[Name].first);
+ assert(PtrAddr && "Missing pointer address");
+ auto PtrTargetAddr =
+ static_cast<TargetAddress>(reinterpret_cast<uintptr_t>(PtrAddr));
+ return JITSymbol(PtrTargetAddr, JITSymbolFlags::None);
+ }
+
+ std::error_code updatePointer(StringRef Name, TargetAddress NewAddr) override {
+ assert(StubIndexes.count(Name) && "No stub pointer for symbol");
+ *IndirectStubsInfo.getPtr(StubIndexes[Name].first) =
+ reinterpret_cast<void*>(static_cast<uintptr_t>(NewAddr));
+ return std::error_code();
+ }
+
+private:
+ typename TargetT::IndirectStubsInfo IndirectStubsInfo;
+ StringMap<std::pair<unsigned, JITSymbolFlags>> StubIndexes;
+};
+
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