| //===---------------------- TableManager.h ----------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Fix edge for edge that needs an entry to reference the target symbol |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_EXECUTIONENGINE_JITLINK_TABLEMANAGER_H |
| #define LLVM_EXECUTIONENGINE_JITLINK_TABLEMANAGER_H |
| |
| #include "llvm/ExecutionEngine/JITLink/JITLink.h" |
| #include "llvm/Support/Debug.h" |
| |
| namespace llvm { |
| namespace jitlink { |
| |
| /// A CRTP base for tables that are built on demand, e.g. Global Offset Tables |
| /// and Procedure Linkage Tables. |
| /// The getEntyrForTarget function returns the table entry corresponding to the |
| /// given target, calling down to the implementation class to build an entry if |
| /// one does not already exist. |
| template <typename TableManagerImplT> class TableManager { |
| public: |
| /// Return the constructed entry |
| /// |
| /// Use parameter G to construct the entry for target symbol |
| Symbol &getEntryForTarget(LinkGraph &G, Symbol &Target) { |
| assert(Target.hasName() && "Edge cannot point to anonymous target"); |
| |
| auto EntryI = Entries.find(Target.getName()); |
| |
| // Build the entry if it doesn't exist. |
| if (EntryI == Entries.end()) { |
| auto &Entry = impl().createEntry(G, Target); |
| DEBUG_WITH_TYPE("jitlink", { |
| dbgs() << " Created" << impl().getSectionName() << "entry for " |
| << Target.getName() << ": " << Entry << "\n"; |
| }); |
| EntryI = Entries.insert(std::make_pair(Target.getName(), &Entry)).first; |
| } |
| |
| assert(EntryI != Entries.end() && "Could not get entry symbol"); |
| DEBUG_WITH_TYPE("jitlink", { |
| dbgs() << " Using " << impl().getSectionName() << " entry " |
| << *EntryI->second << "\n"; |
| }); |
| return *EntryI->second; |
| } |
| |
| private: |
| TableManagerImplT &impl() { return static_cast<TableManagerImplT &>(*this); } |
| DenseMap<StringRef, Symbol *> Entries; |
| }; |
| |
| } // namespace jitlink |
| } // namespace llvm |
| |
| #endif |