// destructively move the contents of src into dest // this assumes that the targets of the two modules are the same // including the DataLayout and ModuleFlags (for example) // and that there is no module-level assembly static void jl_merge_module(Module *dest, std::unique_ptr<Module> src) { assert(dest != src.get()); for (Module::global_iterator I = src->global_begin(), E = src->global_end(); I != E;) { GlobalVariable *sG = &*I; GlobalValue *dG = dest->getNamedValue(sG->getName()); ++I; // Replace a declaration with the definition: if (dG) { if (sG->isDeclaration()) { sG->replaceAllUsesWith(dG); sG->eraseFromParent(); continue; } else { dG->replaceAllUsesWith(sG); dG->eraseFromParent(); } } // Reparent the global variable: sG->removeFromParent(); dest->getGlobalList().push_back(sG); // Comdat is owned by the Module, recreate it in the new parent: addComdat(sG); } for (Module::iterator I = src->begin(), E = src->end(); I != E;) { Function *sG = &*I; GlobalValue *dG = dest->getNamedValue(sG->getName()); ++I; // Replace a declaration with the definition: if (dG) { if (sG->isDeclaration()) { sG->replaceAllUsesWith(dG); sG->eraseFromParent(); continue; } else { dG->replaceAllUsesWith(sG); dG->eraseFromParent(); } } // Reparent the global variable: sG->removeFromParent(); dest->getFunctionList().push_back(sG); // Comdat is owned by the Module, recreate it in the new parent: addComdat(sG); } for (Module::alias_iterator I = src->alias_begin(), E = src->alias_end(); I != E;) { GlobalAlias *sG = &*I; GlobalValue *dG = dest->getNamedValue(sG->getName()); ++I; if (dG) { if (!dG->isDeclaration()) { // aliases are always definitions, so this test is reversed from the above two sG->replaceAllUsesWith(dG); sG->eraseFromParent(); continue; } else { dG->replaceAllUsesWith(sG); dG->eraseFromParent(); } } sG->removeFromParent(); dest->getAliasList().push_back(sG); } // metadata nodes need to be explicitly merged not just copied // so there are special passes here for each known type of metadata NamedMDNode *sNMD = src->getNamedMetadata("llvm.dbg.cu"); if (sNMD) { NamedMDNode *dNMD = dest->getOrInsertNamedMetadata("llvm.dbg.cu"); #ifdef LLVM35 for (NamedMDNode::op_iterator I = sNMD->op_begin(), E = sNMD->op_end(); I != E; ++I) { dNMD->addOperand(*I); } #else for (unsigned i = 0, l = sNMD->getNumOperands(); i < l; i++) { dNMD->addOperand(sNMD->getOperand(i)); } #endif } }