diff options
Diffstat (limited to 'llvm/lib/MC/MCAssembler.cpp')
| -rw-r--r-- | llvm/lib/MC/MCAssembler.cpp | 429 |
1 files changed, 0 insertions, 429 deletions
diff --git a/llvm/lib/MC/MCAssembler.cpp b/llvm/lib/MC/MCAssembler.cpp index 297db86..15e82fa4 100644 --- a/llvm/lib/MC/MCAssembler.cpp +++ b/llvm/lib/MC/MCAssembler.cpp @@ -64,275 +64,6 @@ STATISTIC(RelaxedInstructions, "Number of relaxed instructions"); /* *** */ -MCAsmLayout::MCAsmLayout(MCAssembler &Asm) - : Assembler(Asm), LastValidFragment() - { - // Compute the section layout order. Virtual sections must go last. - for (MCSection &Sec : Asm) - if (!Sec.isVirtualSection()) - SectionOrder.push_back(&Sec); - for (MCSection &Sec : Asm) - if (Sec.isVirtualSection()) - SectionOrder.push_back(&Sec); -} - -bool MCAsmLayout::isFragmentValid(const MCFragment *F) const { - const MCSection *Sec = F->getParent(); - const MCFragment *LastValid = LastValidFragment.lookup(Sec); - if (!LastValid) - return false; - assert(LastValid->getParent() == Sec); - return F->getLayoutOrder() <= LastValid->getLayoutOrder(); -} - -void MCAsmLayout::invalidateFragmentsFrom(MCFragment *F) { - // If this fragment wasn't already valid, we don't need to do anything. - if (!isFragmentValid(F)) - return; - - // Otherwise, reset the last valid fragment to the previous fragment - // (if this is the first fragment, it will be NULL). - LastValidFragment[F->getParent()] = F->getPrevNode(); -} - -void MCAsmLayout::ensureValid(const MCFragment *F) const { - MCSection *Sec = F->getParent(); - MCSection::iterator I; - if (MCFragment *Cur = LastValidFragment[Sec]) - I = ++MCSection::iterator(Cur); - else - I = Sec->begin(); - - // Advance the layout position until the fragment is valid. - while (!isFragmentValid(F)) { - assert(I != Sec->end() && "Layout bookkeeping error"); - const_cast<MCAsmLayout *>(this)->layoutFragment(&*I); - ++I; - } -} - -uint64_t MCAsmLayout::getFragmentOffset(const MCFragment *F) const { - ensureValid(F); - assert(F->Offset != ~UINT64_C(0) && "Address not set!"); - return F->Offset; -} - -// Simple getSymbolOffset helper for the non-varibale case. -static bool getLabelOffset(const MCAsmLayout &Layout, const MCSymbol &S, - bool ReportError, uint64_t &Val) { - if (!S.getFragment()) { - if (ReportError) - report_fatal_error("unable to evaluate offset to undefined symbol '" + - S.getName() + "'"); - return false; - } - Val = Layout.getFragmentOffset(S.getFragment()) + S.getOffset(); - return true; -} - -static bool getSymbolOffsetImpl(const MCAsmLayout &Layout, const MCSymbol &S, - bool ReportError, uint64_t &Val) { - if (!S.isVariable()) - return getLabelOffset(Layout, S, ReportError, Val); - - // If SD is a variable, evaluate it. - MCValue Target; - if (!S.getVariableValue()->evaluateAsValue(Target, Layout)) - report_fatal_error("unable to evaluate offset for variable '" + - S.getName() + "'"); - - uint64_t Offset = Target.getConstant(); - - const MCSymbolRefExpr *A = Target.getSymA(); - if (A) { - uint64_t ValA; - if (!getLabelOffset(Layout, A->getSymbol(), ReportError, ValA)) - return false; - Offset += ValA; - } - - const MCSymbolRefExpr *B = Target.getSymB(); - if (B) { - uint64_t ValB; - if (!getLabelOffset(Layout, B->getSymbol(), ReportError, ValB)) - return false; - Offset -= ValB; - } - - Val = Offset; - return true; -} - -bool MCAsmLayout::getSymbolOffset(const MCSymbol &S, uint64_t &Val) const { - return getSymbolOffsetImpl(*this, S, false, Val); -} - -uint64_t MCAsmLayout::getSymbolOffset(const MCSymbol &S) const { - uint64_t Val; - getSymbolOffsetImpl(*this, S, true, Val); - return Val; -} - -const MCSymbol *MCAsmLayout::getBaseSymbol(const MCSymbol &Symbol) const { - if (!Symbol.isVariable()) - return &Symbol; - - const MCExpr *Expr = Symbol.getVariableValue(); - MCValue Value; - if (!Expr->evaluateAsValue(Value, *this)) { - Assembler.getContext().reportError( - SMLoc(), "expression could not be evaluated"); - return nullptr; - } - - const MCSymbolRefExpr *RefB = Value.getSymB(); - if (RefB) { - Assembler.getContext().reportError( - SMLoc(), Twine("symbol '") + RefB->getSymbol().getName() + - "' could not be evaluated in a subtraction expression"); - return nullptr; - } - - const MCSymbolRefExpr *A = Value.getSymA(); - if (!A) - return nullptr; - - const MCSymbol &ASym = A->getSymbol(); - const MCAssembler &Asm = getAssembler(); - if (ASym.isCommon()) { - // FIXME: we should probably add a SMLoc to MCExpr. - Asm.getContext().reportError(SMLoc(), - "Common symbol '" + ASym.getName() + - "' cannot be used in assignment expr"); - return nullptr; - } - - return &ASym; -} - -uint64_t MCAsmLayout::getSectionAddressSize(const MCSection *Sec) const { - // The size is the last fragment's end offset. - const MCFragment &F = Sec->getFragmentList().back(); - return getFragmentOffset(&F) + getAssembler().computeFragmentSize(*this, F); -} - -uint64_t MCAsmLayout::getSectionFileSize(const MCSection *Sec) const { - // Virtual sections have no file size. - if (Sec->isVirtualSection()) - return 0; - - // Otherwise, the file size is the same as the address space size. - return getSectionAddressSize(Sec); -} - -uint64_t llvm::computeBundlePadding(const MCAssembler &Assembler, - const MCFragment *F, - uint64_t FOffset, uint64_t FSize) { - uint64_t BundleSize = Assembler.getBundleAlignSize(); - assert(BundleSize > 0 && - "computeBundlePadding should only be called if bundling is enabled"); - uint64_t BundleMask = BundleSize - 1; - uint64_t OffsetInBundle = FOffset & BundleMask; - uint64_t EndOfFragment = OffsetInBundle + FSize; - - // There are two kinds of bundling restrictions: - // - // 1) For alignToBundleEnd(), add padding to ensure that the fragment will - // *end* on a bundle boundary. - // 2) Otherwise, check if the fragment would cross a bundle boundary. If it - // would, add padding until the end of the bundle so that the fragment - // will start in a new one. - if (F->alignToBundleEnd()) { - // Three possibilities here: - // - // A) The fragment just happens to end at a bundle boundary, so we're good. - // B) The fragment ends before the current bundle boundary: pad it just - // enough to reach the boundary. - // C) The fragment ends after the current bundle boundary: pad it until it - // reaches the end of the next bundle boundary. - // - // Note: this code could be made shorter with some modulo trickery, but it's - // intentionally kept in its more explicit form for simplicity. - if (EndOfFragment == BundleSize) - return 0; - else if (EndOfFragment < BundleSize) - return BundleSize - EndOfFragment; - else { // EndOfFragment > BundleSize - return 2 * BundleSize - EndOfFragment; - } - } else if (OffsetInBundle > 0 && EndOfFragment > BundleSize) - return BundleSize - OffsetInBundle; - else - return 0; -} - -/* *** */ - -void ilist_node_traits<MCFragment>::deleteNode(MCFragment *V) { - V->destroy(); -} - -MCFragment::MCFragment() : Kind(FragmentType(~0)), HasInstructions(false), - AlignToBundleEnd(false), BundlePadding(0) { -} - -MCFragment::~MCFragment() { } - -MCFragment::MCFragment(FragmentType Kind, bool HasInstructions, - uint8_t BundlePadding, MCSection *Parent) - : Kind(Kind), HasInstructions(HasInstructions), AlignToBundleEnd(false), - BundlePadding(BundlePadding), Parent(Parent), Atom(nullptr), - Offset(~UINT64_C(0)) { - if (Parent && !isDummy()) - Parent->getFragmentList().push_back(this); -} - -void MCFragment::destroy() { - // First check if we are the sentinal. - if (Kind == FragmentType(~0)) { - delete this; - return; - } - - switch (Kind) { - case FT_Align: - delete cast<MCAlignFragment>(this); - return; - case FT_Data: - delete cast<MCDataFragment>(this); - return; - case FT_CompactEncodedInst: - delete cast<MCCompactEncodedInstFragment>(this); - return; - case FT_Fill: - delete cast<MCFillFragment>(this); - return; - case FT_Relaxable: - delete cast<MCRelaxableFragment>(this); - return; - case FT_Org: - delete cast<MCOrgFragment>(this); - return; - case FT_Dwarf: - delete cast<MCDwarfLineAddrFragment>(this); - return; - case FT_DwarfFrame: - delete cast<MCDwarfCallFrameFragment>(this); - return; - case FT_LEB: - delete cast<MCLEBFragment>(this); - return; - case FT_SafeSEH: - delete cast<MCSafeSEHFragment>(this); - return; - case FT_Dummy: - delete cast<MCDummyFragment>(this); - return; - } -} - -/* *** */ - MCAssembler::MCAssembler(MCContext &Context_, MCAsmBackend &Backend_, MCCodeEmitter &Emitter_, MCObjectWriter &Writer_) : Context(Context_), Backend(Backend_), Emitter(Emitter_), Writer(Writer_), @@ -1142,163 +873,3 @@ void MCAssembler::finishLayout(MCAsmLayout &Layout) { Layout.getFragmentOffset(&*Layout.getSectionOrder()[i]->rbegin()); } } - -// Debugging methods - -namespace llvm { - -raw_ostream &operator<<(raw_ostream &OS, const MCFixup &AF) { - OS << "<MCFixup" << " Offset:" << AF.getOffset() - << " Value:" << *AF.getValue() - << " Kind:" << AF.getKind() << ">"; - return OS; -} - -} - -#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) -void MCFragment::dump() { - raw_ostream &OS = llvm::errs(); - - OS << "<"; - switch (getKind()) { - case MCFragment::FT_Align: OS << "MCAlignFragment"; break; - case MCFragment::FT_Data: OS << "MCDataFragment"; break; - case MCFragment::FT_CompactEncodedInst: - OS << "MCCompactEncodedInstFragment"; break; - case MCFragment::FT_Fill: OS << "MCFillFragment"; break; - case MCFragment::FT_Relaxable: OS << "MCRelaxableFragment"; break; - case MCFragment::FT_Org: OS << "MCOrgFragment"; break; - case MCFragment::FT_Dwarf: OS << "MCDwarfFragment"; break; - case MCFragment::FT_DwarfFrame: OS << "MCDwarfCallFrameFragment"; break; - case MCFragment::FT_LEB: OS << "MCLEBFragment"; break; - case MCFragment::FT_SafeSEH: OS << "MCSafeSEHFragment"; break; - case MCFragment::FT_Dummy: - OS << "MCDummyFragment"; - break; - } - - OS << "<MCFragment " << (void*) this << " LayoutOrder:" << LayoutOrder - << " Offset:" << Offset - << " HasInstructions:" << hasInstructions() - << " BundlePadding:" << static_cast<unsigned>(getBundlePadding()) << ">"; - - switch (getKind()) { - case MCFragment::FT_Align: { - const MCAlignFragment *AF = cast<MCAlignFragment>(this); - if (AF->hasEmitNops()) - OS << " (emit nops)"; - OS << "\n "; - OS << " Alignment:" << AF->getAlignment() - << " Value:" << AF->getValue() << " ValueSize:" << AF->getValueSize() - << " MaxBytesToEmit:" << AF->getMaxBytesToEmit() << ">"; - break; - } - case MCFragment::FT_Data: { - const MCDataFragment *DF = cast<MCDataFragment>(this); - OS << "\n "; - OS << " Contents:["; - const SmallVectorImpl<char> &Contents = DF->getContents(); - for (unsigned i = 0, e = Contents.size(); i != e; ++i) { - if (i) OS << ","; - OS << hexdigit((Contents[i] >> 4) & 0xF) << hexdigit(Contents[i] & 0xF); - } - OS << "] (" << Contents.size() << " bytes)"; - - if (DF->fixup_begin() != DF->fixup_end()) { - OS << ",\n "; - OS << " Fixups:["; - for (MCDataFragment::const_fixup_iterator it = DF->fixup_begin(), - ie = DF->fixup_end(); it != ie; ++it) { - if (it != DF->fixup_begin()) OS << ",\n "; - OS << *it; - } - OS << "]"; - } - break; - } - case MCFragment::FT_CompactEncodedInst: { - const MCCompactEncodedInstFragment *CEIF = - cast<MCCompactEncodedInstFragment>(this); - OS << "\n "; - OS << " Contents:["; - const SmallVectorImpl<char> &Contents = CEIF->getContents(); - for (unsigned i = 0, e = Contents.size(); i != e; ++i) { - if (i) OS << ","; - OS << hexdigit((Contents[i] >> 4) & 0xF) << hexdigit(Contents[i] & 0xF); - } - OS << "] (" << Contents.size() << " bytes)"; - break; - } - case MCFragment::FT_Fill: { - const MCFillFragment *FF = cast<MCFillFragment>(this); - OS << " Value:" << FF->getValue() << " ValueSize:" << FF->getValueSize() - << " Size:" << FF->getSize(); - break; - } - case MCFragment::FT_Relaxable: { - const MCRelaxableFragment *F = cast<MCRelaxableFragment>(this); - OS << "\n "; - OS << " Inst:"; - F->getInst().dump_pretty(OS); - break; - } - case MCFragment::FT_Org: { - const MCOrgFragment *OF = cast<MCOrgFragment>(this); - OS << "\n "; - OS << " Offset:" << OF->getOffset() << " Value:" << OF->getValue(); - break; - } - case MCFragment::FT_Dwarf: { - const MCDwarfLineAddrFragment *OF = cast<MCDwarfLineAddrFragment>(this); - OS << "\n "; - OS << " AddrDelta:" << OF->getAddrDelta() - << " LineDelta:" << OF->getLineDelta(); - break; - } - case MCFragment::FT_DwarfFrame: { - const MCDwarfCallFrameFragment *CF = cast<MCDwarfCallFrameFragment>(this); - OS << "\n "; - OS << " AddrDelta:" << CF->getAddrDelta(); - break; - } - case MCFragment::FT_LEB: { - const MCLEBFragment *LF = cast<MCLEBFragment>(this); - OS << "\n "; - OS << " Value:" << LF->getValue() << " Signed:" << LF->isSigned(); - break; - } - case MCFragment::FT_SafeSEH: { - const MCSafeSEHFragment *F = cast<MCSafeSEHFragment>(this); - OS << "\n "; - OS << " Sym:" << F->getSymbol(); - break; - } - case MCFragment::FT_Dummy: - break; - } - OS << ">"; -} - -void MCAssembler::dump() { - raw_ostream &OS = llvm::errs(); - - OS << "<MCAssembler\n"; - OS << " Sections:[\n "; - for (iterator it = begin(), ie = end(); it != ie; ++it) { - if (it != begin()) OS << ",\n "; - it->dump(); - } - OS << "],\n"; - OS << " Symbols:["; - - for (symbol_iterator it = symbol_begin(), ie = symbol_end(); it != ie; ++it) { - if (it != symbol_begin()) OS << ",\n "; - OS << "("; - it->dump(); - OS << ", Index:" << it->getIndex() << ", "; - OS << ")"; - } - OS << "]>\n"; -} -#endif |