void Cache::preload(llvm::ExecutionEngine& _ee, std::unordered_map<std::string, uint64_t>& _funcCache)
{
Guard g{x_cacheMutex};
// Disable listener
auto listener = g_listener;
g_listener = nullptr;
auto cachePath = getVersionedCacheDir();
std::error_code err;
for (auto it = llvm::sys::fs::directory_iterator{cachePath, err}; it != decltype(it){}; it.increment(err))
{
auto name = it->path().substr(cachePath.size() + 1);
if (auto module = getObject(name))
{
DLOG(cache) << "Preload: " << name << "\n";
_ee.addModule(std::move(module));
auto addr = _ee.getFunctionAddress(name);
assert(addr);
_funcCache[std::move(name)] = addr;
}
}
g_listener = listener;
}
bool ExternalDispatcherImpl::executeCall(Function *f, Instruction *i,
uint64_t *args) {
dispatchers_ty::iterator it = dispatchers.find(i);
if (it != dispatchers.end()) {
// Code already JIT'ed for this
return runProtectedCall(it->second, args);
}
// Code for this not JIT'ed. Do this now.
Function *dispatcher;
#ifdef WINDOWS
std::map<std::string, void *>::iterator it2 =
preboundFunctions.find(f->getName());
if (it2 != preboundFunctions.end()) {
// only bind once
if (it2->second) {
executionEngine->addGlobalMapping(f, it2->second);
it2->second = 0;
}
}
#endif
Module *dispatchModule = NULL;
#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 6)
// The MCJIT generates whole modules at a time so for every call that we
// haven't made before we need to create a new Module.
dispatchModule = new Module(getFreshModuleID(), ctx);
#else
dispatchModule = this->singleDispatchModule;
#endif
dispatcher = createDispatcher(f, i, dispatchModule);
dispatchers.insert(std::make_pair(i, dispatcher));
// Force the JIT execution engine to go ahead and build the function. This
// ensures that any errors or assertions in the compilation process will
// trigger crashes instead of being caught as aborts in the external
// function.
#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 6)
if (dispatcher) {
// The dispatchModule is now ready so tell MCJIT to generate the code for
// it.
auto dispatchModuleUniq = std::unique_ptr<Module>(dispatchModule);
executionEngine->addModule(
std::move(dispatchModuleUniq)); // MCJIT takes ownership
// Force code generation
uint64_t fnAddr =
executionEngine->getFunctionAddress(dispatcher->getName());
executionEngine->finalizeObject();
assert(fnAddr && "failed to get function address");
(void)fnAddr;
} else {
// MCJIT didn't take ownership of the module so delete it.
delete dispatchModule;
}
#else
if (dispatcher) {
// Old JIT works on a function at a time so compile the function.
executionEngine->recompileAndRelinkFunction(dispatcher);
}
#endif
return runProtectedCall(dispatcher, args);
}