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-rw-r--r--lib/MC/MCObjectSymbolizer.cpp310
1 files changed, 0 insertions, 310 deletions
diff --git a/lib/MC/MCObjectSymbolizer.cpp b/lib/MC/MCObjectSymbolizer.cpp
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index b9131d1ed609..000000000000
--- a/lib/MC/MCObjectSymbolizer.cpp
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-//===-- lib/MC/MCObjectSymbolizer.cpp -------------------------------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/MC/MCObjectSymbolizer.h"
-#include "llvm/ADT/SmallString.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"
-#include "llvm/Object/ELFObjectFile.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-
-using namespace llvm;
-using namespace object;
-
-//===- MCMachObjectSymbolizer ---------------------------------------------===//
-
-namespace {
-class MCMachObjectSymbolizer : public MCObjectSymbolizer {
- const MachOObjectFile *MOOF;
- // __TEXT;__stubs support.
- uint64_t StubsStart;
- uint64_t StubsCount;
- uint64_t StubSize;
- uint64_t StubsIndSymIndex;
-
-public:
- MCMachObjectSymbolizer(MCContext &Ctx, OwningPtr<MCRelocationInfo> &RelInfo,
- const MachOObjectFile *MOOF);
-
- StringRef findExternalFunctionAt(uint64_t Addr) LLVM_OVERRIDE;
-
- void tryAddingPcLoadReferenceComment(raw_ostream &cStream,
- int64_t Value,
- uint64_t Address) LLVM_OVERRIDE;
-};
-} // End unnamed namespace
-
-
-MCMachObjectSymbolizer::
-MCMachObjectSymbolizer(MCContext &Ctx, OwningPtr<MCRelocationInfo> &RelInfo,
- const MachOObjectFile *MOOF)
- : MCObjectSymbolizer(Ctx, RelInfo, MOOF), MOOF(MOOF),
- StubsStart(0), StubsCount(0), StubSize(0), StubsIndSymIndex(0) {
-
- error_code ec;
- for (section_iterator SI = MOOF->begin_sections(), SE = MOOF->end_sections();
- SI != SE; SI.increment(ec)) {
- if (ec) break;
- StringRef Name; SI->getName(Name);
- if (Name == "__stubs") {
- SectionRef StubsSec = *SI;
- if (MOOF->is64Bit()) {
- MachO::section_64 S = MOOF->getSection64(StubsSec.getRawDataRefImpl());
- StubsIndSymIndex = S.reserved1;
- StubSize = S.reserved2;
- } else {
- MachO::section S = MOOF->getSection(StubsSec.getRawDataRefImpl());
- StubsIndSymIndex = S.reserved1;
- StubSize = S.reserved2;
- }
- assert(StubSize && "Mach-O stub entry size can't be zero!");
- StubsSec.getAddress(StubsStart);
- StubsSec.getSize(StubsCount);
- StubsCount /= StubSize;
- }
- }
-}
-
-StringRef MCMachObjectSymbolizer::findExternalFunctionAt(uint64_t Addr) {
- // FIXME: also, this can all be done at the very beginning, by iterating over
- // all stubs and creating the calls to outside functions. Is it worth it
- // though?
- if (!StubSize)
- return StringRef();
- uint64_t StubIdx = (Addr - StubsStart) / StubSize;
- if (StubIdx >= StubsCount)
- return StringRef();
-
- uint32_t SymtabIdx =
- MOOF->getIndirectSymbolTableEntry(MOOF->getDysymtabLoadCommand(), StubIdx);
-
- StringRef SymName;
- symbol_iterator SI = MOOF->begin_symbols();
- error_code ec;
- for (uint32_t i = 0; i != SymtabIdx; ++i) {
- SI.increment(ec);
- }
- SI->getName(SymName);
- assert(SI != MOOF->end_symbols() && "Stub wasn't found in the symbol table!");
- assert(SymName.front() == '_' && "Mach-O symbol doesn't start with '_'!");
- return SymName.substr(1);
-}
-
-void MCMachObjectSymbolizer::
-tryAddingPcLoadReferenceComment(raw_ostream &cStream, int64_t Value,
- uint64_t Address) {
- if (const RelocationRef *R = findRelocationAt(Address)) {
- const MCExpr *RelExpr = RelInfo->createExprForRelocation(*R);
- if (!RelExpr || RelExpr->EvaluateAsAbsolute(Value) == false)
- return;
- }
- uint64_t Addr = Value;
- if (const SectionRef *S = findSectionContaining(Addr)) {
- StringRef Name; S->getName(Name);
- uint64_t SAddr; S->getAddress(SAddr);
- if (Name == "__cstring") {
- StringRef Contents;
- S->getContents(Contents);
- Contents = Contents.substr(Addr - SAddr);
- cStream << " ## literal pool for: "
- << Contents.substr(0, Contents.find_first_of(0));
- }
- }
-}
-
-//===- MCObjectSymbolizer -------------------------------------------------===//
-
-MCObjectSymbolizer::MCObjectSymbolizer(MCContext &Ctx,
- OwningPtr<MCRelocationInfo> &RelInfo,
- const ObjectFile *Obj)
- : MCSymbolizer(Ctx, RelInfo), Obj(Obj), SortedSections(), AddrToReloc() {
-}
-
-bool MCObjectSymbolizer::
-tryAddingSymbolicOperand(MCInst &MI, raw_ostream &cStream,
- int64_t Value, uint64_t Address, bool IsBranch,
- uint64_t Offset, uint64_t InstSize) {
- if (IsBranch) {
- StringRef ExtFnName = findExternalFunctionAt((uint64_t)Value);
- if (!ExtFnName.empty()) {
- MCSymbol *Sym = Ctx.GetOrCreateSymbol(ExtFnName);
- const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
- MI.addOperand(MCOperand::CreateExpr(Expr));
- return true;
- }
- }
-
- if (const RelocationRef *R = findRelocationAt(Address + Offset)) {
- if (const MCExpr *RelExpr = RelInfo->createExprForRelocation(*R)) {
- MI.addOperand(MCOperand::CreateExpr(RelExpr));
- return true;
- }
- // Only try to create a symbol+offset expression if there is no relocation.
- return false;
- }
-
- // Interpret Value as a branch target.
- if (IsBranch == false)
- return false;
- uint64_t UValue = Value;
- // FIXME: map instead of looping each time?
- error_code ec;
- for (symbol_iterator SI = Obj->begin_symbols(), SE = Obj->end_symbols();
- SI != SE; SI.increment(ec)) {
- if (ec) break;
- uint64_t SymAddr; SI->getAddress(SymAddr);
- uint64_t SymSize; SI->getSize(SymSize);
- StringRef SymName; SI->getName(SymName);
- SymbolRef::Type SymType; SI->getType(SymType);
- if (SymAddr == UnknownAddressOrSize || SymSize == UnknownAddressOrSize
- || SymName.empty() || SymType != SymbolRef::ST_Function)
- continue;
-
- if ( SymAddr == UValue ||
- (SymAddr <= UValue && SymAddr + SymSize > UValue)) {
- MCSymbol *Sym = Ctx.GetOrCreateSymbol(SymName);
- const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
- if (SymAddr != UValue) {
- const MCExpr *Off = MCConstantExpr::Create(UValue - SymAddr, Ctx);
- Expr = MCBinaryExpr::CreateAdd(Expr, Off, Ctx);
- }
- MI.addOperand(MCOperand::CreateExpr(Expr));
- return true;
- }
- }
- return false;
-}
-
-void MCObjectSymbolizer::
-tryAddingPcLoadReferenceComment(raw_ostream &cStream,
- int64_t Value, uint64_t Address) {
-}
-
-StringRef MCObjectSymbolizer::findExternalFunctionAt(uint64_t Addr) {
- return StringRef();
-}
-
-MCObjectSymbolizer *
-MCObjectSymbolizer::createObjectSymbolizer(MCContext &Ctx,
- OwningPtr<MCRelocationInfo> &RelInfo,
- const ObjectFile *Obj) {
- if (const MachOObjectFile *MOOF = dyn_cast<MachOObjectFile>(Obj))
- return new MCMachObjectSymbolizer(Ctx, RelInfo, MOOF);
- return new MCObjectSymbolizer(Ctx, RelInfo, Obj);
-}
-
-// SortedSections implementation.
-
-static bool SectionStartsBefore(const SectionRef &S, uint64_t Addr) {
- uint64_t SAddr; S.getAddress(SAddr);
- return SAddr < Addr;
-}
-
-const SectionRef *MCObjectSymbolizer::findSectionContaining(uint64_t Addr) {
- if (SortedSections.empty())
- buildSectionList();
-
- SortedSectionList::iterator
- EndIt = SortedSections.end(),
- It = std::lower_bound(SortedSections.begin(), EndIt,
- Addr, SectionStartsBefore);
- if (It == EndIt)
- return 0;
- uint64_t SAddr; It->getAddress(SAddr);
- uint64_t SSize; It->getSize(SSize);
- if (Addr >= SAddr + SSize)
- return 0;
- return &*It;
-}
-
-const RelocationRef *MCObjectSymbolizer::findRelocationAt(uint64_t Addr) {
- if (AddrToReloc.empty())
- buildRelocationByAddrMap();
-
- AddrToRelocMap::const_iterator RI = AddrToReloc.find(Addr);
- if (RI == AddrToReloc.end())
- return 0;
- return &RI->second;
-}
-
-void MCObjectSymbolizer::buildSectionList() {
- error_code ec;
- for (section_iterator SI = Obj->begin_sections(), SE = Obj->end_sections();
- SI != SE; SI.increment(ec)) {
- if (ec) break;
-
- bool RequiredForExec; SI->isRequiredForExecution(RequiredForExec);
- if (RequiredForExec == false)
- continue;
- uint64_t SAddr; SI->getAddress(SAddr);
- uint64_t SSize; SI->getSize(SSize);
- SortedSectionList::iterator It = std::lower_bound(SortedSections.begin(),
- SortedSections.end(),
- SAddr,
- SectionStartsBefore);
- if (It != SortedSections.end()) {
- uint64_t FoundSAddr; It->getAddress(FoundSAddr);
- if (FoundSAddr < SAddr + SSize)
- llvm_unreachable("Inserting overlapping sections");
- }
- SortedSections.insert(It, *SI);
- }
-}
-
-void MCObjectSymbolizer::buildRelocationByAddrMap() {
- error_code ec;
- for (section_iterator SI = Obj->begin_sections(), SE = Obj->end_sections();
- SI != SE; SI.increment(ec)) {
- if (ec) break;
-
- section_iterator RelSecI = SI->getRelocatedSection();
- if (RelSecI == Obj->end_sections())
- continue;
-
- uint64_t StartAddr; RelSecI->getAddress(StartAddr);
- uint64_t Size; RelSecI->getSize(Size);
- bool RequiredForExec; RelSecI->isRequiredForExecution(RequiredForExec);
- if (RequiredForExec == false || Size == 0)
- continue;
- for (relocation_iterator RI = SI->begin_relocations(),
- RE = SI->end_relocations();
- RI != RE;
- RI.increment(ec)) {
- if (ec) break;
- // FIXME: libObject is inconsistent regarding error handling. The
- // overwhelming majority of methods always return object_error::success,
- // and assert for simple errors.. Here, ELFObjectFile::getRelocationOffset
- // asserts when the file type isn't ET_REL.
- // This workaround handles x86-64 elf, the only one that has a relocinfo.
- uint64_t Offset;
- if (Obj->isELF()) {
- const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj);
- if (ELFObj == 0)
- break;
- if (ELFObj->getELFFile()->getHeader()->e_type == ELF::ET_REL) {
- RI->getOffset(Offset);
- Offset += StartAddr;
- } else {
- RI->getAddress(Offset);
- }
- } else {
- RI->getOffset(Offset);
- Offset += StartAddr;
- }
- // At a specific address, only keep the first relocation.
- if (AddrToReloc.find(Offset) == AddrToReloc.end())
- AddrToReloc[Offset] = *RI;
- }
- }
-}
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