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//===-- 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);
}
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