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bc59809461
Summary: Enables JIT-linking by RuntimeDyld of COFF objects that contain references to dllimport symbols. This is done by recognizing symbols that start with the reserved "__imp_" prefix and building a pointer entry to the target symbol in the stubs area of the section. References to the "__imp_" symbol are updated to point to this pointer. Work in progress: The generic code is in place, but only RuntimeDyldCOFFX86_64 and RuntimeDyldCOFFI386 have been updated to look for and update references to dllimport symbols. Reviewers: compnerd Subscribers: hiraditya, ributzka, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D75884
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
//===-- RuntimeDyldCOFF.h - Run-time dynamic linker for MC-JIT ---*- 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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// COFF support for MC-JIT runtime dynamic linker.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_RUNTIME_DYLD_COFF_H
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#define LLVM_RUNTIME_DYLD_COFF_H
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#include "RuntimeDyldImpl.h"
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#define DEBUG_TYPE "dyld"
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using namespace llvm;
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namespace llvm {
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// Common base class for COFF dynamic linker support.
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// Concrete subclasses for each target can be found in ./Targets.
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class RuntimeDyldCOFF : public RuntimeDyldImpl {
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public:
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std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
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loadObject(const object::ObjectFile &Obj) override;
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bool isCompatibleFile(const object::ObjectFile &Obj) const override;
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static std::unique_ptr<RuntimeDyldCOFF>
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create(Triple::ArchType Arch, RuntimeDyld::MemoryManager &MemMgr,
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JITSymbolResolver &Resolver);
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protected:
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RuntimeDyldCOFF(RuntimeDyld::MemoryManager &MemMgr,
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JITSymbolResolver &Resolver, unsigned PointerSize,
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uint32_t PointerReloc)
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: RuntimeDyldImpl(MemMgr, Resolver), PointerSize(PointerSize),
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PointerReloc(PointerReloc) {
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assert((PointerSize == 4 || PointerSize == 8) && "Unexpected pointer size");
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}
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uint64_t getSymbolOffset(const SymbolRef &Sym);
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uint64_t getDLLImportOffset(unsigned SectionID, StubMap &Stubs,
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StringRef Name, bool SetSectionIDMinus1 = false);
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static constexpr StringRef getImportSymbolPrefix() { return "__imp_"; }
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private:
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unsigned PointerSize;
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uint32_t PointerReloc;
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};
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} // end namespace llvm
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#undef DEBUG_TYPE
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#endif
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