6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===---------------------- TableManager.h ----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Fix edge for edge that needs an entry to reference the target symbol
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_JITLINK_TABLEMANAGER_H
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#define LLVM_EXECUTIONENGINE_JITLINK_TABLEMANAGER_H
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#include "llvm/ExecutionEngine/JITLink/JITLink.h"
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#include "llvm/Support/Debug.h"
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namespace llvm {
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namespace jitlink {
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/// A CRTP base for tables that are built on demand, e.g. Global Offset Tables
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/// and Procedure Linkage Tables.
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/// The getEntyrForTarget function returns the table entry corresponding to the
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/// given target, calling down to the implementation class to build an entry if
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/// one does not already exist.
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template <typename TableManagerImplT> class TableManager {
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public:
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/// Return the constructed entry
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///
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/// Use parameter G to construct the entry for target symbol
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Symbol &getEntryForTarget(LinkGraph &G, Symbol &Target) {
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assert(Target.hasName() && "Edge cannot point to anonymous target");
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auto EntryI = Entries.find(Target.getName());
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// Build the entry if it doesn't exist.
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if (EntryI == Entries.end()) {
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auto &Entry = impl().createEntry(G, Target);
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DEBUG_WITH_TYPE("jitlink", {
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dbgs() << " Created " << impl().getSectionName() << " entry for "
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<< Target.getName() << ": " << Entry << "\n";
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});
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EntryI = Entries.insert(std::make_pair(Target.getName(), &Entry)).first;
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}
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assert(EntryI != Entries.end() && "Could not get entry symbol");
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DEBUG_WITH_TYPE("jitlink", {
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dbgs() << " Using " << impl().getSectionName() << " entry "
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<< *EntryI->second << "\n";
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});
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return *EntryI->second;
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}
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/// Register a pre-existing entry.
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///
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/// Objects may include pre-existing table entries (e.g. for GOTs).
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/// This method can be used to register those entries so that they will not
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/// be duplicated by createEntry the first time that getEntryForTarget is
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/// called.
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bool registerPreExistingEntry(Symbol &Target, Symbol &Entry) {
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assert(Target.hasName() && "Edge cannot point to anonymous target");
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auto Res = Entries.insert({
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Target.getName(),
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&Entry,
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});
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return Res.second;
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}
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private:
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TableManagerImplT &impl() { return static_cast<TableManagerImplT &>(*this); }
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DenseMap<StringRef, Symbol *> Entries;
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};
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} // namespace jitlink
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} // namespace llvm
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#endif
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