1//===- Linker.h - Module Linker Interface -----------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef LLVM_LINKER_LINKER_H 11#define LLVM_LINKER_LINKER_H 12 13#include "llvm/Linker/IRMover.h" 14 15namespace llvm { 16class Module; 17class StructType; 18class Type; 19 20/// This class provides the core functionality of linking in LLVM. It keeps a 21/// pointer to the merged module so far. It doesn't take ownership of the 22/// module since it is assumed that the user of this class will want to do 23/// something with it after the linking. 24class Linker { 25 IRMover Mover; 26 27public: 28 enum Flags { 29 None = 0, 30 OverrideFromSrc = (1 << 0), 31 LinkOnlyNeeded = (1 << 1), 32 InternalizeLinkedSymbols = (1 << 2), 33 /// Don't force link referenced linkonce definitions, import declaration. 34 DontForceLinkLinkonceODR = (1 << 3) 35 36 }; 37 38 Linker(Module &M); 39 40 /// \brief Link \p Src into the composite. 41 /// 42 /// Passing OverrideSymbols as true will have symbols from Src 43 /// shadow those in the Dest. 44 /// For ThinLTO function importing/exporting the \p ModuleSummaryIndex 45 /// is passed. If \p GlobalsToImport is provided, only the globals that 46 /// are part of the set will be imported from the source module. 47 /// 48 /// Returns true on error. 49 bool linkInModule(std::unique_ptr<Module> Src, unsigned Flags = Flags::None, 50 DenseSet<const GlobalValue *> *GlobalsToImport = nullptr); 51 52 static bool linkModules(Module &Dest, std::unique_ptr<Module> Src, 53 unsigned Flags = Flags::None); 54}; 55 56} // End llvm namespace 57 58#endif 59