| //===-- X86MachORelocationInfo.cpp ----------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "MCTargetDesc/X86MCTargetDesc.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCInst.h" |
| #include "llvm/MC/MCRelocationInfo.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Object/MachO.h" |
| |
| using namespace llvm; |
| using namespace object; |
| using namespace MachO; |
| |
| namespace { |
| class X86_64MachORelocationInfo : public MCRelocationInfo { |
| public: |
| X86_64MachORelocationInfo(MCContext &Ctx) : MCRelocationInfo(Ctx) {} |
| |
| const MCExpr *createExprForRelocation(RelocationRef Rel) override { |
| const MachOObjectFile *Obj = cast<MachOObjectFile>(Rel.getObject()); |
| |
| uint64_t RelType = Rel.getType(); |
| symbol_iterator SymI = Rel.getSymbol(); |
| |
| ErrorOr<StringRef> SymNameOrErr = SymI->getName(); |
| if (std::error_code EC = SymNameOrErr.getError()) |
| report_fatal_error(EC.message()); |
| StringRef SymName = *SymNameOrErr; |
| uint64_t SymAddr = SymI->getValue(); |
| |
| any_relocation_info RE = Obj->getRelocation(Rel.getRawDataRefImpl()); |
| bool isPCRel = Obj->getAnyRelocationPCRel(RE); |
| |
| MCSymbol *Sym = Ctx.getOrCreateSymbol(SymName); |
| // FIXME: check that the value is actually the same. |
| if (!Sym->isVariable()) |
| Sym->setVariableValue(MCConstantExpr::create(SymAddr, Ctx)); |
| const MCExpr *Expr = nullptr; |
| |
| switch(RelType) { |
| case X86_64_RELOC_TLV: |
| Expr = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_TLVP, Ctx); |
| break; |
| case X86_64_RELOC_SIGNED_4: |
| Expr = MCBinaryExpr::createAdd(MCSymbolRefExpr::create(Sym, Ctx), |
| MCConstantExpr::create(4, Ctx), |
| Ctx); |
| break; |
| case X86_64_RELOC_SIGNED_2: |
| Expr = MCBinaryExpr::createAdd(MCSymbolRefExpr::create(Sym, Ctx), |
| MCConstantExpr::create(2, Ctx), |
| Ctx); |
| break; |
| case X86_64_RELOC_SIGNED_1: |
| Expr = MCBinaryExpr::createAdd(MCSymbolRefExpr::create(Sym, Ctx), |
| MCConstantExpr::create(1, Ctx), |
| Ctx); |
| break; |
| case X86_64_RELOC_GOT_LOAD: |
| Expr = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Ctx); |
| break; |
| case X86_64_RELOC_GOT: |
| Expr = MCSymbolRefExpr::create(Sym, isPCRel ? |
| MCSymbolRefExpr::VK_GOTPCREL : |
| MCSymbolRefExpr::VK_GOT, |
| Ctx); |
| break; |
| case X86_64_RELOC_SUBTRACTOR: |
| { |
| Rel.moveNext(); |
| any_relocation_info RENext = |
| Obj->getRelocation(Rel.getRawDataRefImpl()); |
| |
| // X86_64_SUBTRACTOR must be followed by a relocation of type |
| // X86_64_RELOC_UNSIGNED. |
| // NOTE: Scattered relocations don't exist on x86_64. |
| unsigned RType = Obj->getAnyRelocationType(RENext); |
| if (RType != X86_64_RELOC_UNSIGNED) |
| report_fatal_error("Expected X86_64_RELOC_UNSIGNED after " |
| "X86_64_RELOC_SUBTRACTOR."); |
| |
| const MCExpr *LHS = MCSymbolRefExpr::create(Sym, Ctx); |
| |
| symbol_iterator RSymI = Rel.getSymbol(); |
| uint64_t RSymAddr = RSymI->getValue(); |
| ErrorOr<StringRef> RSymName = RSymI->getName(); |
| if (std::error_code EC = RSymName.getError()) |
| report_fatal_error(EC.message()); |
| |
| MCSymbol *RSym = Ctx.getOrCreateSymbol(*RSymName); |
| if (!RSym->isVariable()) |
| RSym->setVariableValue(MCConstantExpr::create(RSymAddr, Ctx)); |
| |
| const MCExpr *RHS = MCSymbolRefExpr::create(RSym, Ctx); |
| |
| Expr = MCBinaryExpr::createSub(LHS, RHS, Ctx); |
| break; |
| } |
| default: |
| Expr = MCSymbolRefExpr::create(Sym, Ctx); |
| break; |
| } |
| return Expr; |
| } |
| }; |
| } // End unnamed namespace |
| |
| /// createX86_64MachORelocationInfo - Construct an X86-64 Mach-O RelocationInfo. |
| MCRelocationInfo *llvm::createX86_64MachORelocationInfo(MCContext &Ctx) { |
| return new X86_64MachORelocationInfo(Ctx); |
| } |