1 //===-- X86MachORelocationInfo.cpp ----------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "MCTargetDesc/X86MCTargetDesc.h"
11 #include "llvm/MC/MCContext.h"
12 #include "llvm/MC/MCExpr.h"
13 #include "llvm/MC/MCInst.h"
14 #include "llvm/MC/MCRelocationInfo.h"
15 #include "llvm/MC/MCSymbol.h"
16 #include "llvm/Object/MachO.h"
19 using namespace object;
20 using namespace MachO;
23 class X86_64MachORelocationInfo : public MCRelocationInfo {
25 X86_64MachORelocationInfo(MCContext &Ctx) : MCRelocationInfo(Ctx) {}
27 const MCExpr *createExprForRelocation(RelocationRef Rel) override {
28 const MachOObjectFile *Obj = cast<MachOObjectFile>(Rel.getObject());
30 uint64_t RelType = Rel.getType();
31 symbol_iterator SymI = Rel.getSymbol();
33 ErrorOr<StringRef> SymNameOrErr = SymI->getName();
34 if (std::error_code EC = SymNameOrErr.getError())
35 report_fatal_error(EC.message());
36 StringRef SymName = *SymNameOrErr;
37 uint64_t SymAddr = SymI->getValue();
39 any_relocation_info RE = Obj->getRelocation(Rel.getRawDataRefImpl());
40 bool isPCRel = Obj->getAnyRelocationPCRel(RE);
42 MCSymbol *Sym = Ctx.getOrCreateSymbol(SymName);
43 // FIXME: check that the value is actually the same.
44 if (!Sym->isVariable())
45 Sym->setVariableValue(MCConstantExpr::create(SymAddr, Ctx));
46 const MCExpr *Expr = nullptr;
49 case X86_64_RELOC_TLV:
50 Expr = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_TLVP, Ctx);
52 case X86_64_RELOC_SIGNED_4:
53 Expr = MCBinaryExpr::createAdd(MCSymbolRefExpr::create(Sym, Ctx),
54 MCConstantExpr::create(4, Ctx),
57 case X86_64_RELOC_SIGNED_2:
58 Expr = MCBinaryExpr::createAdd(MCSymbolRefExpr::create(Sym, Ctx),
59 MCConstantExpr::create(2, Ctx),
62 case X86_64_RELOC_SIGNED_1:
63 Expr = MCBinaryExpr::createAdd(MCSymbolRefExpr::create(Sym, Ctx),
64 MCConstantExpr::create(1, Ctx),
67 case X86_64_RELOC_GOT_LOAD:
68 Expr = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Ctx);
70 case X86_64_RELOC_GOT:
71 Expr = MCSymbolRefExpr::create(Sym, isPCRel ?
72 MCSymbolRefExpr::VK_GOTPCREL :
73 MCSymbolRefExpr::VK_GOT,
76 case X86_64_RELOC_SUBTRACTOR:
79 any_relocation_info RENext =
80 Obj->getRelocation(Rel.getRawDataRefImpl());
82 // X86_64_SUBTRACTOR must be followed by a relocation of type
83 // X86_64_RELOC_UNSIGNED.
84 // NOTE: Scattered relocations don't exist on x86_64.
85 unsigned RType = Obj->getAnyRelocationType(RENext);
86 if (RType != X86_64_RELOC_UNSIGNED)
87 report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
88 "X86_64_RELOC_SUBTRACTOR.");
90 const MCExpr *LHS = MCSymbolRefExpr::create(Sym, Ctx);
92 symbol_iterator RSymI = Rel.getSymbol();
93 uint64_t RSymAddr = RSymI->getValue();
94 ErrorOr<StringRef> RSymName = RSymI->getName();
95 if (std::error_code EC = RSymName.getError())
96 report_fatal_error(EC.message());
98 MCSymbol *RSym = Ctx.getOrCreateSymbol(*RSymName);
99 if (!RSym->isVariable())
100 RSym->setVariableValue(MCConstantExpr::create(RSymAddr, Ctx));
102 const MCExpr *RHS = MCSymbolRefExpr::create(RSym, Ctx);
104 Expr = MCBinaryExpr::createSub(LHS, RHS, Ctx);
108 Expr = MCSymbolRefExpr::create(Sym, Ctx);
114 } // End unnamed namespace
116 /// createX86_64MachORelocationInfo - Construct an X86-64 Mach-O RelocationInfo.
117 MCRelocationInfo *llvm::createX86_64MachORelocationInfo(MCContext &Ctx) {
118 return new X86_64MachORelocationInfo(Ctx);