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83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
//===--- BasicGOTAndStubsBuilder.h - Generic GOT/Stub creation --*- 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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// A base for simple GOT and stub creation.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_EXECUTIONENGINE_JITLINK_BASICGOTANDSTUBSBUILDER_H
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#define LLVM_LIB_EXECUTIONENGINE_JITLINK_BASICGOTANDSTUBSBUILDER_H
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#include "llvm/ExecutionEngine/JITLink/JITLink.h"
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namespace llvm {
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namespace jitlink {
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template <typename BuilderImpl> class BasicGOTAndStubsBuilder {
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public:
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BasicGOTAndStubsBuilder(AtomGraph &G) : G(G) {}
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void run() {
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// We're going to be adding new atoms, but we don't want to iterate over
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// the newly added ones, so just copy the existing atoms out.
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std::vector<DefinedAtom *> DAs(G.defined_atoms().begin(),
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G.defined_atoms().end());
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for (auto *DA : DAs)
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for (auto &E : DA->edges())
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if (impl().isGOTEdge(E))
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impl().fixGOTEdge(E, getGOTEntryAtom(E.getTarget()));
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else if (impl().isExternalBranchEdge(E))
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impl().fixExternalBranchEdge(E, getStubAtom(E.getTarget()));
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}
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protected:
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Atom &getGOTEntryAtom(Atom &Target) {
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assert(Target.hasName() && "GOT edge cannot point to anonymous target");
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auto GOTEntryI = GOTEntries.find(Target.getName());
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// Build the entry if it doesn't exist.
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if (GOTEntryI == GOTEntries.end()) {
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auto &GOTEntry = impl().createGOTEntry(Target);
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GOTEntryI =
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GOTEntries.insert(std::make_pair(Target.getName(), &GOTEntry)).first;
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}
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assert(GOTEntryI != GOTEntries.end() && "Could not get GOT entry atom");
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return *GOTEntryI->second;
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}
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Atom &getStubAtom(Atom &Target) {
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assert(Target.hasName() &&
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"External branch edge can not point to an anonymous target");
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auto StubI = Stubs.find(Target.getName());
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if (StubI == Stubs.end()) {
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auto &StubAtom = impl().createStub(Target);
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StubI = Stubs.insert(std::make_pair(Target.getName(), &StubAtom)).first;
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}
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assert(StubI != Stubs.end() && "Count not get stub atom");
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return *StubI->second;
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}
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AtomGraph &G;
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private:
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BuilderImpl &impl() { return static_cast<BuilderImpl &>(*this); }
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DenseMap<StringRef, DefinedAtom *> GOTEntries;
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DenseMap<StringRef, DefinedAtom *> Stubs;
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};
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} // end namespace jitlink
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} // end namespace llvm
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#endif // LLVM_LIB_EXECUTIONENGINE_JITLINK_BASICGOTANDSTUBSBUILDER_H
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