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  1. //===---------------------- TableManager.h ----------------------*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. // Fix edge for edge that needs an entry to reference the target symbol
  10. //
  11. //===----------------------------------------------------------------------===//
  12.  
  13. #ifndef LLVM_EXECUTIONENGINE_JITLINK_TABLEMANAGER_H
  14. #define LLVM_EXECUTIONENGINE_JITLINK_TABLEMANAGER_H
  15.  
  16. #include "llvm/ExecutionEngine/JITLink/JITLink.h"
  17. #include "llvm/Support/Debug.h"
  18.  
  19. namespace llvm {
  20. namespace jitlink {
  21.  
  22. /// A CRTP base for tables that are built on demand, e.g. Global Offset Tables
  23. /// and Procedure Linkage Tables.
  24. /// The getEntyrForTarget function returns the table entry corresponding to the
  25. /// given target, calling down to the implementation class to build an entry if
  26. /// one does not already exist.
  27. template <typename TableManagerImplT> class TableManager {
  28. public:
  29.   /// Return the constructed entry
  30.   ///
  31.   /// Use parameter G to construct the entry for target symbol
  32.   Symbol &getEntryForTarget(LinkGraph &G, Symbol &Target) {
  33.     assert(Target.hasName() && "Edge cannot point to anonymous target");
  34.  
  35.     auto EntryI = Entries.find(Target.getName());
  36.  
  37.     // Build the entry if it doesn't exist.
  38.     if (EntryI == Entries.end()) {
  39.       auto &Entry = impl().createEntry(G, Target);
  40.       DEBUG_WITH_TYPE("jitlink", {
  41.         dbgs() << "    Created " << impl().getSectionName() << "entry for "
  42.                << Target.getName() << ": " << Entry << "\n";
  43.       });
  44.       EntryI = Entries.insert(std::make_pair(Target.getName(), &Entry)).first;
  45.     }
  46.  
  47.     assert(EntryI != Entries.end() && "Could not get entry symbol");
  48.     DEBUG_WITH_TYPE("jitlink", {
  49.       dbgs() << "    Using " << impl().getSectionName() << " entry "
  50.              << *EntryI->second << "\n";
  51.     });
  52.     return *EntryI->second;
  53.   }
  54.  
  55. private:
  56.   TableManagerImplT &impl() { return static_cast<TableManagerImplT &>(*this); }
  57.   DenseMap<StringRef, Symbol *> Entries;
  58. };
  59.  
  60. } // namespace jitlink
  61. } // namespace llvm
  62.  
  63. #endif
  64.