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255f89faee
AKA: Recompile *ALL* the source code! This one went much better. No manual edits here. I spot-checked for silliness and grep-checked for really broken edits and everything seemed good. It all still compiles. Yell if you see something that looks goofy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169133 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
//===-- RelocVisitor.h - Visitor for object file relocations -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides a wrapper around all the different types of relocations
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// in different file formats, such that a client can handle them in a unified
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// manner by only implementing a minimal number of functions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LLVM_OBJECT_RELOCVISITOR
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#define _LLVM_OBJECT_RELOCVISITOR
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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namespace object {
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struct RelocToApply {
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// The computed value after applying the relevant relocations.
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int64_t Value;
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// The width of the value; how many bytes to touch when applying the
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// relocation.
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char Width;
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RelocToApply(const RelocToApply &In) : Value(In.Value), Width(In.Width) {}
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RelocToApply(int64_t Value, char Width) : Value(Value), Width(Width) {}
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RelocToApply() : Value(0), Width(0) {}
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};
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/// @brief Base class for object file relocation visitors.
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class RelocVisitor {
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public:
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explicit RelocVisitor(llvm::StringRef FileFormat)
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: FileFormat(FileFormat), HasError(false) {}
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// TODO: Should handle multiple applied relocations via either passing in the
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// previously computed value or just count paired relocations as a single
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// visit.
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RelocToApply visit(uint32_t RelocType, RelocationRef R, uint64_t SecAddr = 0,
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uint64_t Value = 0) {
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if (FileFormat == "ELF64-x86-64") {
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switch (RelocType) {
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case llvm::ELF::R_X86_64_NONE:
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return visitELF_X86_64_NONE(R);
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case llvm::ELF::R_X86_64_64:
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return visitELF_X86_64_64(R, Value);
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case llvm::ELF::R_X86_64_PC32:
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return visitELF_X86_64_PC32(R, Value, SecAddr);
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case llvm::ELF::R_X86_64_32:
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return visitELF_X86_64_32(R, Value);
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case llvm::ELF::R_X86_64_32S:
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return visitELF_X86_64_32S(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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}
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return RelocToApply();
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}
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bool error() { return HasError; }
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private:
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llvm::StringRef FileFormat;
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bool HasError;
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/// Operations
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/// X86-64 ELF
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RelocToApply visitELF_X86_64_NONE(RelocationRef R) {
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return RelocToApply(0, 0);
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}
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RelocToApply visitELF_X86_64_64(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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R.getAdditionalInfo(Addend);
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return RelocToApply(Value + Addend, 8);
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}
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RelocToApply visitELF_X86_64_PC32(RelocationRef R, uint64_t Value,
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uint64_t SecAddr) {
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int64_t Addend;
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R.getAdditionalInfo(Addend);
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uint64_t Address;
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R.getAddress(Address);
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return RelocToApply(Value + Addend - Address, 4);
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}
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RelocToApply visitELF_X86_64_32(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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R.getAdditionalInfo(Addend);
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uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
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return RelocToApply(Res, 4);
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}
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RelocToApply visitELF_X86_64_32S(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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R.getAdditionalInfo(Addend);
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int32_t Res = (Value + Addend) & 0xFFFFFFFF;
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return RelocToApply(Res, 4);
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}
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};
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}
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}
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#endif
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