#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
-#include "llvm/ADT/OwningPtr.h"
+#include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCAsmBackend.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetRegistry.h"
-#include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/Support/TargetRegistry.h"
-#include <vector>
using namespace llvm;
namespace {
namespace stats {
STATISTIC(EmittedFragments, "Number of emitted assembler fragments");
-STATISTIC(EvaluateFixup, "Number of evaluated fixups");
+STATISTIC(evaluateFixup, "Number of evaluated fixups");
STATISTIC(FragmentLayouts, "Number of fragment layouts");
STATISTIC(ObjectBytes, "Number of emitted object file bytes");
STATISTIC(RelaxationSteps, "Number of assembler layout and relaxation steps");
STATISTIC(RelaxedInstructions, "Number of relaxed instructions");
-STATISTIC(SectionLayouts, "Number of section layouts");
}
}
/* *** */
-MCAsmLayout::MCAsmLayout(MCAssembler &Asm) : Assembler(Asm) {
+MCAsmLayout::MCAsmLayout(MCAssembler &Asm)
+ : Assembler(Asm), LastValidFragment()
+ {
// Compute the section layout order. Virtual sections must go last.
for (MCAssembler::iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it)
- if (!Asm.getBackend().isVirtualSection(it->getSection()))
+ if (!it->getSection().isVirtualSection())
SectionOrder.push_back(&*it);
for (MCAssembler::iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it)
- if (Asm.getBackend().isVirtualSection(it->getSection()))
+ if (it->getSection().isVirtualSection())
SectionOrder.push_back(&*it);
}
-void MCAsmLayout::UpdateForSlide(MCFragment *F, int SlideAmount) {
- // We shouldn't have to do anything special to support negative slides, and it
- // is a perfectly valid thing to do as long as other parts of the system can
- // guarantee convergence.
- assert(SlideAmount >= 0 && "Negative slides not yet supported");
+bool MCAsmLayout::isFragmentUpToDate(const MCFragment *F) const {
+ const MCSectionData &SD = *F->getParent();
+ const MCFragment *LastValid = LastValidFragment.lookup(&SD);
+ if (!LastValid)
+ return false;
+ assert(LastValid->getParent() == F->getParent());
+ return F->getLayoutOrder() <= LastValid->getLayoutOrder();
+}
- // Update the layout by simply recomputing the layout for the entire
- // file. This is trivially correct, but very slow.
- //
- // FIXME-PERF: This is O(N^2), but will be eliminated once we get smarter.
+void MCAsmLayout::Invalidate(MCFragment *F) {
+ // If this fragment wasn't already up-to-date, we don't need to do anything.
+ if (!isFragmentUpToDate(F))
+ return;
- // Layout the sections in order.
- for (unsigned i = 0, e = getSectionOrder().size(); i != e; ++i)
- getAssembler().LayoutSection(*this, i);
+ // Otherwise, reset the last valid fragment to this fragment.
+ const MCSectionData &SD = *F->getParent();
+ LastValidFragment[&SD] = F;
}
-uint64_t MCAsmLayout::getFragmentAddress(const MCFragment *F) const {
- assert(F->getParent() && "Missing section()!");
- return getSectionAddress(F->getParent()) + getFragmentOffset(F);
-}
+void MCAsmLayout::EnsureValid(const MCFragment *F) const {
+ MCSectionData &SD = *F->getParent();
-uint64_t MCAsmLayout::getFragmentEffectiveSize(const MCFragment *F) const {
- assert(F->EffectiveSize != ~UINT64_C(0) && "Address not set!");
- return F->EffectiveSize;
-}
+ MCFragment *Cur = LastValidFragment[&SD];
+ if (!Cur)
+ Cur = &*SD.begin();
+ else
+ Cur = Cur->getNextNode();
-void MCAsmLayout::setFragmentEffectiveSize(MCFragment *F, uint64_t Value) {
- F->EffectiveSize = Value;
+ // Advance the layout position until the fragment is up-to-date.
+ while (!isFragmentUpToDate(F)) {
+ const_cast<MCAsmLayout*>(this)->LayoutFragment(Cur);
+ Cur = Cur->getNextNode();
+ }
}
uint64_t MCAsmLayout::getFragmentOffset(const MCFragment *F) const {
+ EnsureValid(F);
assert(F->Offset != ~UINT64_C(0) && "Address not set!");
return F->Offset;
}
-void MCAsmLayout::setFragmentOffset(MCFragment *F, uint64_t Value) {
- F->Offset = Value;
-}
-
-uint64_t MCAsmLayout::getSymbolAddress(const MCSymbolData *SD) const {
- assert(SD->getFragment() && "Invalid getAddress() on undefined symbol!");
- return getFragmentAddress(SD->getFragment()) + SD->getOffset();
-}
+uint64_t MCAsmLayout::getSymbolOffset(const MCSymbolData *SD) const {
+ const MCSymbol &S = SD->getSymbol();
+
+ // If this is a variable, then recursively evaluate now.
+ if (S.isVariable()) {
+ MCValue Target;
+ if (!S.getVariableValue()->EvaluateAsRelocatable(Target, *this))
+ report_fatal_error("unable to evaluate offset for variable '" +
+ S.getName() + "'");
+
+ // Verify that any used symbols are defined.
+ if (Target.getSymA() && Target.getSymA()->getSymbol().isUndefined())
+ report_fatal_error("unable to evaluate offset to undefined symbol '" +
+ Target.getSymA()->getSymbol().getName() + "'");
+ if (Target.getSymB() && Target.getSymB()->getSymbol().isUndefined())
+ report_fatal_error("unable to evaluate offset to undefined symbol '" +
+ Target.getSymB()->getSymbol().getName() + "'");
+
+ uint64_t Offset = Target.getConstant();
+ if (Target.getSymA())
+ Offset += getSymbolOffset(&Assembler.getSymbolData(
+ Target.getSymA()->getSymbol()));
+ if (Target.getSymB())
+ Offset -= getSymbolOffset(&Assembler.getSymbolData(
+ Target.getSymB()->getSymbol()));
+ return Offset;
+ }
-uint64_t MCAsmLayout::getSectionAddress(const MCSectionData *SD) const {
- assert(SD->Address != ~UINT64_C(0) && "Address not set!");
- return SD->Address;
+ assert(SD->getFragment() && "Invalid getOffset() on undefined symbol!");
+ return getFragmentOffset(SD->getFragment()) + SD->getOffset();
}
-void MCAsmLayout::setSectionAddress(MCSectionData *SD, uint64_t Value) {
- SD->Address = Value;
-}
-
-uint64_t MCAsmLayout::getSectionSize(const MCSectionData *SD) const {
- assert(SD->Size != ~UINT64_C(0) && "File size not set!");
- return SD->Size;
-}
-void MCAsmLayout::setSectionSize(MCSectionData *SD, uint64_t Value) {
- SD->Size = Value;
+uint64_t MCAsmLayout::getSectionAddressSize(const MCSectionData *SD) const {
+ // The size is the last fragment's end offset.
+ const MCFragment &F = SD->getFragmentList().back();
+ return getFragmentOffset(&F) + getAssembler().computeFragmentSize(*this, F);
}
uint64_t MCAsmLayout::getSectionFileSize(const MCSectionData *SD) const {
- assert(SD->FileSize != ~UINT64_C(0) && "File size not set!");
- return SD->FileSize;
-}
-void MCAsmLayout::setSectionFileSize(MCSectionData *SD, uint64_t Value) {
- SD->FileSize = Value;
+ // Virtual sections have no file size.
+ if (SD->getSection().isVirtualSection())
+ return 0;
+
+ // Otherwise, the file size is the same as the address space size.
+ return getSectionAddressSize(SD);
}
/* *** */
MCFragment::MCFragment() : Kind(FragmentType(~0)) {
}
+MCFragment::~MCFragment() {
+}
+
MCFragment::MCFragment(FragmentType _Kind, MCSectionData *_Parent)
- : Kind(_Kind), Parent(_Parent), Atom(0), EffectiveSize(~UINT64_C(0))
+ : Kind(_Kind), Parent(_Parent), Atom(0), Offset(~UINT64_C(0))
{
if (Parent)
Parent->getFragmentList().push_back(this);
}
-MCFragment::~MCFragment() {
-}
-
/* *** */
MCSectionData::MCSectionData() : Section(0) {}
MCSectionData::MCSectionData(const MCSection &_Section, MCAssembler *A)
: Section(&_Section),
+ Ordinal(~UINT32_C(0)),
Alignment(1),
- Address(~UINT64_C(0)),
- Size(~UINT64_C(0)),
- FileSize(~UINT64_C(0)),
HasInstructions(false)
{
if (A)
uint64_t _Offset, MCAssembler *A)
: Symbol(&_Symbol), Fragment(_Fragment), Offset(_Offset),
IsExternal(false), IsPrivateExtern(false),
- CommonSize(0), CommonAlign(0), Flags(0), Index(0)
+ CommonSize(0), SymbolSize(0), CommonAlign(0),
+ Flags(0), Index(0)
{
if (A)
A->getSymbolList().push_back(this);
/* *** */
-MCAssembler::MCAssembler(MCContext &_Context, TargetAsmBackend &_Backend,
- MCCodeEmitter &_Emitter, raw_ostream &_OS)
- : Context(_Context), Backend(_Backend), Emitter(_Emitter),
- OS(_OS), RelaxAll(false), SubsectionsViaSymbols(false)
+MCAssembler::MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
+ MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
+ raw_ostream &OS_)
+ : Context(Context_), Backend(Backend_), Emitter(Emitter_), Writer(Writer_),
+ OS(OS_), RelaxAll(false), NoExecStack(false), SubsectionsViaSymbols(false)
{
}
MCAssembler::~MCAssembler() {
}
-static bool isScatteredFixupFullyResolvedSimple(const MCAssembler &Asm,
- const MCAsmFixup &Fixup,
- const MCValue Target,
- const MCSection *BaseSection) {
- // The effective fixup address is
- // addr(atom(A)) + offset(A)
- // - addr(atom(B)) - offset(B)
- // - addr(<base symbol>) + <fixup offset from base symbol>
- // and the offsets are not relocatable, so the fixup is fully resolved when
- // addr(atom(A)) - addr(atom(B)) - addr(<base symbol>)) == 0.
- //
- // The simple (Darwin, except on x86_64) way of dealing with this was to
- // assume that any reference to a temporary symbol *must* be a temporary
- // symbol in the same atom, unless the sections differ. Therefore, any PCrel
- // relocation to a temporary symbol (in the same section) is fully
- // resolved. This also works in conjunction with absolutized .set, which
- // requires the compiler to use .set to absolutize the differences between
- // symbols which the compiler knows to be assembly time constants, so we don't
- // need to worry about considering symbol differences fully resolved.
-
- // Non-relative fixups are only resolved if constant.
- if (!BaseSection)
- return Target.isAbsolute();
-
- // Otherwise, relative fixups are only resolved if not a difference and the
- // target is a temporary in the same section.
- if (Target.isAbsolute() || Target.getSymB())
- return false;
-
- const MCSymbol *A = &Target.getSymA()->getSymbol();
- if (!A->isTemporary() || !A->isInSection() ||
- &A->getSection() != BaseSection)
- return false;
-
- return true;
-}
-
-static bool isScatteredFixupFullyResolved(const MCAssembler &Asm,
- const MCAsmLayout &Layout,
- const MCAsmFixup &Fixup,
- const MCValue Target,
- const MCSymbolData *BaseSymbol) {
- // The effective fixup address is
- // addr(atom(A)) + offset(A)
- // - addr(atom(B)) - offset(B)
- // - addr(BaseSymbol) + <fixup offset from base symbol>
- // and the offsets are not relocatable, so the fixup is fully resolved when
- // addr(atom(A)) - addr(atom(B)) - addr(BaseSymbol) == 0.
- //
- // Note that "false" is almost always conservatively correct (it means we emit
- // a relocation which is unnecessary), except when it would force us to emit a
- // relocation which the target cannot encode.
-
- const MCSymbolData *A_Base = 0, *B_Base = 0;
- if (const MCSymbolRefExpr *A = Target.getSymA()) {
- // Modified symbol references cannot be resolved.
- if (A->getKind() != MCSymbolRefExpr::VK_None)
- return false;
-
- A_Base = Asm.getAtom(Layout, &Asm.getSymbolData(A->getSymbol()));
- if (!A_Base)
- return false;
- }
-
- if (const MCSymbolRefExpr *B = Target.getSymB()) {
- // Modified symbol references cannot be resolved.
- if (B->getKind() != MCSymbolRefExpr::VK_None)
- return false;
-
- B_Base = Asm.getAtom(Layout, &Asm.getSymbolData(B->getSymbol()));
- if (!B_Base)
- return false;
- }
-
- // If there is no base, A and B have to be the same atom for this fixup to be
- // fully resolved.
- if (!BaseSymbol)
- return A_Base == B_Base;
-
- // Otherwise, B must be missing and A must be the base.
- return !B_Base && BaseSymbol == A_Base;
-}
-
-bool MCAssembler::isSymbolLinkerVisible(const MCSymbolData *SD) const {
+bool MCAssembler::isSymbolLinkerVisible(const MCSymbol &Symbol) const {
// Non-temporary labels should always be visible to the linker.
- if (!SD->getSymbol().isTemporary())
+ if (!Symbol.isTemporary())
return true;
// Absolute temporary labels are never visible.
- if (!SD->getFragment())
+ if (!Symbol.isInSection())
return false;
// Otherwise, check if the section requires symbols even for temporary labels.
- return getBackend().doesSectionRequireSymbols(
- SD->getFragment()->getParent()->getSection());
+ return getBackend().doesSectionRequireSymbols(Symbol.getSection());
}
-const MCSymbolData *MCAssembler::getAtom(const MCAsmLayout &Layout,
- const MCSymbolData *SD) const {
+const MCSymbolData *MCAssembler::getAtom(const MCSymbolData *SD) const {
// Linker visible symbols define atoms.
- if (isSymbolLinkerVisible(SD))
+ if (isSymbolLinkerVisible(SD->getSymbol()))
return SD;
// Absolute and undefined symbols have no defining atom.
return SD->getFragment()->getAtom();
}
-bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout,
- const MCAsmFixup &Fixup, const MCFragment *DF,
+bool MCAssembler::evaluateFixup(const MCAsmLayout &Layout,
+ const MCFixup &Fixup, const MCFragment *DF,
MCValue &Target, uint64_t &Value) const {
- ++stats::EvaluateFixup;
+ ++stats::evaluateFixup;
+
+ if (!Fixup.getValue()->EvaluateAsRelocatable(Target, Layout))
+ getContext().FatalError(Fixup.getLoc(), "expected relocatable expression");
- if (!Fixup.Value->EvaluateAsRelocatable(Target, &Layout))
- report_fatal_error("expected relocatable expression");
+ bool IsPCRel = Backend.getFixupKindInfo(
+ Fixup.getKind()).Flags & MCFixupKindInfo::FKF_IsPCRel;
- // FIXME: How do non-scattered symbols work in ELF? I presume the linker
- // doesn't support small relocations, but then under what criteria does the
- // assembler allow symbol differences?
+ bool IsResolved;
+ if (IsPCRel) {
+ if (Target.getSymB()) {
+ IsResolved = false;
+ } else if (!Target.getSymA()) {
+ IsResolved = false;
+ } else {
+ const MCSymbolRefExpr *A = Target.getSymA();
+ const MCSymbol &SA = A->getSymbol();
+ if (A->getKind() != MCSymbolRefExpr::VK_None ||
+ SA.AliasedSymbol().isUndefined()) {
+ IsResolved = false;
+ } else {
+ const MCSymbolData &DataA = getSymbolData(SA);
+ IsResolved =
+ getWriter().IsSymbolRefDifferenceFullyResolvedImpl(*this, DataA,
+ *DF, false, true);
+ }
+ }
+ } else {
+ IsResolved = Target.isAbsolute();
+ }
Value = Target.getConstant();
- bool IsPCRel =
- Emitter.getFixupKindInfo(Fixup.Kind).Flags & MCFixupKindInfo::FKF_IsPCRel;
- bool IsResolved = true;
if (const MCSymbolRefExpr *A = Target.getSymA()) {
- if (A->getSymbol().isDefined())
- Value += Layout.getSymbolAddress(&getSymbolData(A->getSymbol()));
- else
- IsResolved = false;
+ const MCSymbol &Sym = A->getSymbol().AliasedSymbol();
+ if (Sym.isDefined())
+ Value += Layout.getSymbolOffset(&getSymbolData(Sym));
}
if (const MCSymbolRefExpr *B = Target.getSymB()) {
- if (B->getSymbol().isDefined())
- Value -= Layout.getSymbolAddress(&getSymbolData(B->getSymbol()));
- else
- IsResolved = false;
+ const MCSymbol &Sym = B->getSymbol().AliasedSymbol();
+ if (Sym.isDefined())
+ Value -= Layout.getSymbolOffset(&getSymbolData(Sym));
}
- // If we are using scattered symbols, determine whether this value is actually
- // resolved; scattering may cause atoms to move.
- if (IsResolved && getBackend().hasScatteredSymbols()) {
- if (getBackend().hasReliableSymbolDifference()) {
- // If this is a PCrel relocation, find the base atom (identified by its
- // symbol) that the fixup value is relative to.
- const MCSymbolData *BaseSymbol = 0;
- if (IsPCRel) {
- BaseSymbol = DF->getAtom();
- if (!BaseSymbol)
- IsResolved = false;
- }
- if (IsResolved)
- IsResolved = isScatteredFixupFullyResolved(*this, Layout, Fixup, Target,
- BaseSymbol);
- } else {
- const MCSection *BaseSection = 0;
- if (IsPCRel)
- BaseSection = &DF->getParent()->getSection();
+ bool ShouldAlignPC = Backend.getFixupKindInfo(Fixup.getKind()).Flags &
+ MCFixupKindInfo::FKF_IsAlignedDownTo32Bits;
+ assert((ShouldAlignPC ? IsPCRel : true) &&
+ "FKF_IsAlignedDownTo32Bits is only allowed on PC-relative fixups!");
- IsResolved = isScatteredFixupFullyResolvedSimple(*this, Fixup, Target,
- BaseSection);
- }
+ if (IsPCRel) {
+ uint32_t Offset = Layout.getFragmentOffset(DF) + Fixup.getOffset();
+
+ // A number of ARM fixups in Thumb mode require that the effective PC
+ // address be determined as the 32-bit aligned version of the actual offset.
+ if (ShouldAlignPC) Offset &= ~0x3;
+ Value -= Offset;
}
- if (IsPCRel)
- Value -= Layout.getFragmentAddress(DF) + Fixup.Offset;
+ // Let the backend adjust the fixup value if necessary, including whether
+ // we need a relocation.
+ Backend.processFixupValue(*this, Layout, Fixup, DF, Target, Value,
+ IsResolved);
return IsResolved;
}
-void MCAssembler::LayoutFragment(MCAsmLayout &Layout, MCFragment &F) {
- uint64_t StartAddress = Layout.getSectionAddress(F.getParent());
-
- // Get the fragment start address.
- uint64_t Address = StartAddress;
- MCSectionData::iterator it = &F;
- if (MCFragment *Prev = F.getPrevNode())
- Address = (StartAddress + Layout.getFragmentOffset(Prev) +
- Layout.getFragmentEffectiveSize(Prev));
-
- ++stats::FragmentLayouts;
-
- uint64_t FragmentOffset = Address - StartAddress;
- Layout.setFragmentOffset(&F, FragmentOffset);
-
- // Evaluate fragment size.
- uint64_t EffectiveSize = 0;
+uint64_t MCAssembler::computeFragmentSize(const MCAsmLayout &Layout,
+ const MCFragment &F) const {
switch (F.getKind()) {
- case MCFragment::FT_Align: {
- MCAlignFragment &AF = cast<MCAlignFragment>(F);
-
- EffectiveSize = OffsetToAlignment(Address, AF.getAlignment());
- if (EffectiveSize > AF.getMaxBytesToEmit())
- EffectiveSize = 0;
- break;
- }
-
case MCFragment::FT_Data:
- EffectiveSize = cast<MCDataFragment>(F).getContents().size();
- break;
+ return cast<MCDataFragment>(F).getContents().size();
+ case MCFragment::FT_Fill:
+ return cast<MCFillFragment>(F).getSize();
+ case MCFragment::FT_Inst:
+ return cast<MCInstFragment>(F).getInstSize();
- case MCFragment::FT_Fill: {
- MCFillFragment &FF = cast<MCFillFragment>(F);
- EffectiveSize = FF.getSize();
- break;
- }
+ case MCFragment::FT_LEB:
+ return cast<MCLEBFragment>(F).getContents().size();
- case MCFragment::FT_Inst:
- EffectiveSize = cast<MCInstFragment>(F).getInstSize();
- break;
+ case MCFragment::FT_Align: {
+ const MCAlignFragment &AF = cast<MCAlignFragment>(F);
+ unsigned Offset = Layout.getFragmentOffset(&AF);
+ unsigned Size = OffsetToAlignment(Offset, AF.getAlignment());
+ if (Size > AF.getMaxBytesToEmit())
+ return 0;
+ return Size;
+ }
case MCFragment::FT_Org: {
MCOrgFragment &OF = cast<MCOrgFragment>(F);
-
int64_t TargetLocation;
- if (!OF.getOffset().EvaluateAsAbsolute(TargetLocation, &Layout))
+ if (!OF.getOffset().EvaluateAsAbsolute(TargetLocation, Layout))
report_fatal_error("expected assembly-time absolute expression");
// FIXME: We need a way to communicate this error.
- int64_t Offset = TargetLocation - FragmentOffset;
- if (Offset < 0)
+ uint64_t FragmentOffset = Layout.getFragmentOffset(&OF);
+ int64_t Size = TargetLocation - FragmentOffset;
+ if (Size < 0 || Size >= 0x40000000)
report_fatal_error("invalid .org offset '" + Twine(TargetLocation) +
- "' (at offset '" + Twine(FragmentOffset) + "'");
-
- EffectiveSize = Offset;
- break;
+ "' (at offset '" + Twine(FragmentOffset) + "')");
+ return Size;
}
- case MCFragment::FT_ZeroFill: {
- EffectiveSize = cast<MCZeroFillFragment>(F).getSize();
- break;
- }
+ case MCFragment::FT_Dwarf:
+ return cast<MCDwarfLineAddrFragment>(F).getContents().size();
+ case MCFragment::FT_DwarfFrame:
+ return cast<MCDwarfCallFrameFragment>(F).getContents().size();
}
- Layout.setFragmentEffectiveSize(&F, EffectiveSize);
+ llvm_unreachable("invalid fragment kind");
}
-void MCAssembler::LayoutSection(MCAsmLayout &Layout,
- unsigned SectionOrderIndex) {
- MCSectionData &SD = *Layout.getSectionOrder()[SectionOrderIndex];
- bool IsVirtual = getBackend().isVirtualSection(SD.getSection());
-
- ++stats::SectionLayouts;
+void MCAsmLayout::LayoutFragment(MCFragment *F) {
+ MCFragment *Prev = F->getPrevNode();
- // Get the section start address.
- uint64_t StartAddress = 0;
- if (SectionOrderIndex) {
- MCSectionData *Prev = Layout.getSectionOrder()[SectionOrderIndex - 1];
- StartAddress = Layout.getSectionAddress(Prev) + Layout.getSectionSize(Prev);
- }
-
- // Align this section if necessary by adding padding bytes to the previous
- // section. It is safe to adjust this out-of-band, because no symbol or
- // fragment is allowed to point past the end of the section at any time.
- if (uint64_t Pad = OffsetToAlignment(StartAddress, SD.getAlignment())) {
- // Unless this section is virtual (where we are allowed to adjust the offset
- // freely), the padding goes in the previous section.
- if (!IsVirtual) {
- assert(SectionOrderIndex && "Invalid initial section address!");
- MCSectionData *Prev = Layout.getSectionOrder()[SectionOrderIndex - 1];
- Layout.setSectionFileSize(Prev, Layout.getSectionFileSize(Prev) + Pad);
- }
+ // We should never try to recompute something which is up-to-date.
+ assert(!isFragmentUpToDate(F) && "Attempt to recompute up-to-date fragment!");
+ // We should never try to compute the fragment layout if it's predecessor
+ // isn't up-to-date.
+ assert((!Prev || isFragmentUpToDate(Prev)) &&
+ "Attempt to compute fragment before it's predecessor!");
- StartAddress += Pad;
- }
-
- // Set the aligned section address.
- Layout.setSectionAddress(&SD, StartAddress);
+ ++stats::FragmentLayouts;
- for (MCSectionData::iterator it = SD.begin(), ie = SD.end(); it != ie; ++it)
- LayoutFragment(Layout, *it);
+ // Compute fragment offset and size.
+ uint64_t Offset = 0;
+ if (Prev)
+ Offset += Prev->Offset + getAssembler().computeFragmentSize(*this, *Prev);
- // Set the section sizes.
- uint64_t Size = 0;
- if (!SD.getFragmentList().empty()) {
- MCFragment *F = &SD.getFragmentList().back();
- Size = Layout.getFragmentOffset(F) + Layout.getFragmentEffectiveSize(F);
- }
- Layout.setSectionSize(&SD, Size);
- Layout.setSectionFileSize(&SD, IsVirtual ? 0 : Size);
+ F->Offset = Offset;
+ LastValidFragment[F->getParent()] = F;
}
/// WriteFragmentData - Write the \arg F data to the output file.
static void WriteFragmentData(const MCAssembler &Asm, const MCAsmLayout &Layout,
- const MCFragment &F, MCObjectWriter *OW) {
+ const MCFragment &F) {
+ MCObjectWriter *OW = &Asm.getWriter();
uint64_t Start = OW->getStream().tell();
(void) Start;
++stats::EmittedFragments;
// FIXME: Embed in fragments instead?
- uint64_t FragmentSize = Layout.getFragmentEffectiveSize(&F);
+ uint64_t FragmentSize = Asm.computeFragmentSize(Layout, F);
switch (F.getKind()) {
case MCFragment::FT_Align: {
MCAlignFragment &AF = cast<MCAlignFragment>(F);
// the Count bytes. Then if that did not fill any bytes or there are any
// bytes left to fill use the the Value and ValueSize to fill the rest.
// If we are aligning with nops, ask that target to emit the right data.
- if (AF.getEmitNops()) {
- if (!Asm.getBackend().WriteNopData(Count, OW))
+ if (AF.hasEmitNops()) {
+ if (!Asm.getBackend().writeNopData(Count, OW))
report_fatal_error("unable to write nop sequence of " +
Twine(Count) + " bytes");
break;
// Otherwise, write out in multiples of the value size.
for (uint64_t i = 0; i != Count; ++i) {
switch (AF.getValueSize()) {
- default:
- assert(0 && "Invalid size!");
+ default: llvm_unreachable("Invalid size!");
case 1: OW->Write8 (uint8_t (AF.getValue())); break;
case 2: OW->Write16(uint16_t(AF.getValue())); break;
case 4: OW->Write32(uint32_t(AF.getValue())); break;
for (uint64_t i = 0, e = FF.getSize() / FF.getValueSize(); i != e; ++i) {
switch (FF.getValueSize()) {
- default:
- assert(0 && "Invalid size!");
+ default: llvm_unreachable("Invalid size!");
case 1: OW->Write8 (uint8_t (FF.getValue())); break;
case 2: OW->Write16(uint16_t(FF.getValue())); break;
case 4: OW->Write32(uint32_t(FF.getValue())); break;
break;
}
- case MCFragment::FT_Inst:
- llvm_unreachable("unexpected inst fragment after lowering");
+ case MCFragment::FT_Inst: {
+ MCInstFragment &IF = cast<MCInstFragment>(F);
+ OW->WriteBytes(StringRef(IF.getCode().begin(), IF.getCode().size()));
+ break;
+ }
+
+ case MCFragment::FT_LEB: {
+ MCLEBFragment &LF = cast<MCLEBFragment>(F);
+ OW->WriteBytes(LF.getContents().str());
break;
+ }
case MCFragment::FT_Org: {
MCOrgFragment &OF = cast<MCOrgFragment>(F);
break;
}
- case MCFragment::FT_ZeroFill: {
- assert(0 && "Invalid zero fill fragment in concrete section!");
+ case MCFragment::FT_Dwarf: {
+ const MCDwarfLineAddrFragment &OF = cast<MCDwarfLineAddrFragment>(F);
+ OW->WriteBytes(OF.getContents().str());
+ break;
+ }
+ case MCFragment::FT_DwarfFrame: {
+ const MCDwarfCallFrameFragment &CF = cast<MCDwarfCallFrameFragment>(F);
+ OW->WriteBytes(CF.getContents().str());
break;
}
}
assert(OW->getStream().tell() - Start == FragmentSize);
}
-void MCAssembler::WriteSectionData(const MCSectionData *SD,
- const MCAsmLayout &Layout,
- MCObjectWriter *OW) const {
- uint64_t SectionSize = Layout.getSectionSize(SD);
- uint64_t SectionFileSize = Layout.getSectionFileSize(SD);
-
+void MCAssembler::writeSectionData(const MCSectionData *SD,
+ const MCAsmLayout &Layout) const {
// Ignore virtual sections.
- if (getBackend().isVirtualSection(SD->getSection())) {
- assert(SectionFileSize == 0 && "Invalid size for section!");
+ if (SD->getSection().isVirtualSection()) {
+ assert(Layout.getSectionFileSize(SD) == 0 && "Invalid size for section!");
// Check that contents are only things legal inside a virtual section.
for (MCSectionData::const_iterator it = SD->begin(),
ie = SD->end(); it != ie; ++it) {
switch (it->getKind()) {
- default:
- assert(0 && "Invalid fragment in virtual section!");
+ default: llvm_unreachable("Invalid fragment in virtual section!");
+ case MCFragment::FT_Data: {
+ // Check that we aren't trying to write a non-zero contents (or fixups)
+ // into a virtual section. This is to support clients which use standard
+ // directives to fill the contents of virtual sections.
+ MCDataFragment &DF = cast<MCDataFragment>(*it);
+ assert(DF.fixup_begin() == DF.fixup_end() &&
+ "Cannot have fixups in virtual section!");
+ for (unsigned i = 0, e = DF.getContents().size(); i != e; ++i)
+ assert(DF.getContents()[i] == 0 &&
+ "Invalid data value for virtual section!");
+ break;
+ }
case MCFragment::FT_Align:
- assert(!cast<MCAlignFragment>(it)->getValueSize() &&
+ // Check that we aren't trying to write a non-zero value into a virtual
+ // section.
+ assert((!cast<MCAlignFragment>(it)->getValueSize() ||
+ !cast<MCAlignFragment>(it)->getValue()) &&
"Invalid align in virtual section!");
break;
case MCFragment::FT_Fill:
assert(!cast<MCFillFragment>(it)->getValueSize() &&
"Invalid fill in virtual section!");
break;
- case MCFragment::FT_ZeroFill:
- break;
}
}
return;
}
- uint64_t Start = OW->getStream().tell();
+ uint64_t Start = getWriter().getStream().tell();
(void) Start;
for (MCSectionData::const_iterator it = SD->begin(),
ie = SD->end(); it != ie; ++it)
- WriteFragmentData(*this, Layout, *it, OW);
+ WriteFragmentData(*this, Layout, *it);
- // Add section padding.
- assert(SectionFileSize >= SectionSize && "Invalid section sizes!");
- OW->WriteZeros(SectionFileSize - SectionSize);
-
- assert(OW->getStream().tell() - Start == SectionFileSize);
+ assert(getWriter().getStream().tell() - Start ==
+ Layout.getSectionAddressSize(SD));
}
+
+uint64_t MCAssembler::handleFixup(const MCAsmLayout &Layout,
+ MCFragment &F,
+ const MCFixup &Fixup) {
+ // Evaluate the fixup.
+ MCValue Target;
+ uint64_t FixedValue;
+ if (!evaluateFixup(Layout, Fixup, &F, Target, FixedValue)) {
+ // The fixup was unresolved, we need a relocation. Inform the object
+ // writer of the relocation, and give it an opportunity to adjust the
+ // fixup value if need be.
+ getWriter().RecordRelocation(*this, Layout, &F, Fixup, Target, FixedValue);
+ }
+ return FixedValue;
+ }
+
void MCAssembler::Finish() {
DEBUG_WITH_TYPE("mc-dump", {
llvm::errs() << "assembler backend - pre-layout\n--\n";
dump(); });
- // Assign section and fragment ordinals, all subsequent backend code is
- // responsible for updating these in place.
+ // Create the layout object.
+ MCAsmLayout Layout(*this);
+
+ // Create dummy fragments and assign section ordinals.
unsigned SectionIndex = 0;
- unsigned FragmentIndex = 0;
for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it) {
+ // Create dummy fragments to eliminate any empty sections, this simplifies
+ // layout.
+ if (it->getFragmentList().empty())
+ new MCDataFragment(it);
+
it->setOrdinal(SectionIndex++);
+ }
- for (MCSectionData::iterator it2 = it->begin(),
- ie2 = it->end(); it2 != ie2; ++it2)
- it2->setOrdinal(FragmentIndex++);
+ // Assign layout order indices to sections and fragments.
+ for (unsigned i = 0, e = Layout.getSectionOrder().size(); i != e; ++i) {
+ MCSectionData *SD = Layout.getSectionOrder()[i];
+ SD->setLayoutOrder(i);
+
+ unsigned FragmentIndex = 0;
+ for (MCSectionData::iterator it2 = SD->begin(),
+ ie2 = SD->end(); it2 != ie2; ++it2)
+ it2->setLayoutOrder(FragmentIndex++);
}
// Layout until everything fits.
- MCAsmLayout Layout(*this);
- while (LayoutOnce(Layout))
+ while (layoutOnce(Layout))
continue;
DEBUG_WITH_TYPE("mc-dump", {
dump(); });
// Finalize the layout, including fragment lowering.
- FinishLayout(Layout);
+ finishLayout(Layout);
DEBUG_WITH_TYPE("mc-dump", {
llvm::errs() << "assembler backend - final-layout\n--\n";
dump(); });
uint64_t StartOffset = OS.tell();
- llvm::OwningPtr<MCObjectWriter> Writer(getBackend().createObjectWriter(OS));
- if (!Writer)
- report_fatal_error("unable to create object writer!");
// Allow the object writer a chance to perform post-layout binding (for
// example, to set the index fields in the symbol data).
- Writer->ExecutePostLayoutBinding(*this);
+ getWriter().ExecutePostLayoutBinding(*this, Layout);
// Evaluate and apply the fixups, generating relocation entries as necessary.
for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it) {
for (MCSectionData::iterator it2 = it->begin(),
ie2 = it->end(); it2 != ie2; ++it2) {
MCDataFragment *DF = dyn_cast<MCDataFragment>(it2);
- if (!DF)
- continue;
-
- for (MCDataFragment::fixup_iterator it3 = DF->fixup_begin(),
- ie3 = DF->fixup_end(); it3 != ie3; ++it3) {
- MCAsmFixup &Fixup = *it3;
-
- // Evaluate the fixup.
- MCValue Target;
- uint64_t FixedValue;
- if (!EvaluateFixup(Layout, Fixup, DF, Target, FixedValue)) {
- // The fixup was unresolved, we need a relocation. Inform the object
- // writer of the relocation, and give it an opportunity to adjust the
- // fixup value if need be.
- Writer->RecordRelocation(*this, Layout, DF, Fixup, Target,FixedValue);
+ if (DF) {
+ for (MCDataFragment::fixup_iterator it3 = DF->fixup_begin(),
+ ie3 = DF->fixup_end(); it3 != ie3; ++it3) {
+ MCFixup &Fixup = *it3;
+ uint64_t FixedValue = handleFixup(Layout, *DF, Fixup);
+ getBackend().applyFixup(Fixup, DF->getContents().data(),
+ DF->getContents().size(), FixedValue);
+ }
+ }
+ MCInstFragment *IF = dyn_cast<MCInstFragment>(it2);
+ if (IF) {
+ for (MCInstFragment::fixup_iterator it3 = IF->fixup_begin(),
+ ie3 = IF->fixup_end(); it3 != ie3; ++it3) {
+ MCFixup &Fixup = *it3;
+ uint64_t FixedValue = handleFixup(Layout, *IF, Fixup);
+ getBackend().applyFixup(Fixup, IF->getCode().data(),
+ IF->getCode().size(), FixedValue);
}
-
- getBackend().ApplyFixup(Fixup, *DF, FixedValue);
}
}
}
// Write the object file.
- Writer->WriteObject(*this, Layout);
- OS.flush();
+ getWriter().WriteObject(*this, Layout);
stats::ObjectBytes += OS.tell() - StartOffset;
}
-bool MCAssembler::FixupNeedsRelaxation(const MCAsmFixup &Fixup,
- const MCFragment *DF,
+bool MCAssembler::fixupNeedsRelaxation(const MCFixup &Fixup,
+ const MCInstFragment *DF,
const MCAsmLayout &Layout) const {
if (getRelaxAll())
return true;
// If we cannot resolve the fixup value, it requires relaxation.
MCValue Target;
uint64_t Value;
- if (!EvaluateFixup(Layout, Fixup, DF, Target, Value))
+ if (!evaluateFixup(Layout, Fixup, DF, Target, Value))
return true;
- // Otherwise, relax if the value is too big for a (signed) i8.
- //
- // FIXME: This is target dependent!
- return int64_t(Value) != int64_t(int8_t(Value));
+ return getBackend().fixupNeedsRelaxation(Fixup, Value, DF, Layout);
}
-bool MCAssembler::FragmentNeedsRelaxation(const MCInstFragment *IF,
+bool MCAssembler::fragmentNeedsRelaxation(const MCInstFragment *IF,
const MCAsmLayout &Layout) const {
// If this inst doesn't ever need relaxation, ignore it. This occurs when we
// are intentionally pushing out inst fragments, or because we relaxed a
// previous instruction to one that doesn't need relaxation.
- if (!getBackend().MayNeedRelaxation(IF->getInst(), IF->getFixups()))
+ if (!getBackend().mayNeedRelaxation(IF->getInst()))
return false;
for (MCInstFragment::const_fixup_iterator it = IF->fixup_begin(),
ie = IF->fixup_end(); it != ie; ++it)
- if (FixupNeedsRelaxation(*it, IF, Layout))
+ if (fixupNeedsRelaxation(*it, IF, Layout))
return true;
return false;
}
-bool MCAssembler::LayoutOnce(MCAsmLayout &Layout) {
- ++stats::RelaxationSteps;
+bool MCAssembler::relaxInstruction(MCAsmLayout &Layout,
+ MCInstFragment &IF) {
+ if (!fragmentNeedsRelaxation(&IF, Layout))
+ return false;
+
+ ++stats::RelaxedInstructions;
+
+ // FIXME-PERF: We could immediately lower out instructions if we can tell
+ // they are fully resolved, to avoid retesting on later passes.
+
+ // Relax the fragment.
+
+ MCInst Relaxed;
+ getBackend().relaxInstruction(IF.getInst(), Relaxed);
- // Layout the sections in order.
- for (unsigned i = 0, e = Layout.getSectionOrder().size(); i != e; ++i)
- LayoutSection(Layout, i);
+ // Encode the new instruction.
+ //
+ // FIXME-PERF: If it matters, we could let the target do this. It can
+ // probably do so more efficiently in many cases.
+ SmallVector<MCFixup, 4> Fixups;
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ getEmitter().EncodeInstruction(Relaxed, VecOS, Fixups);
+ VecOS.flush();
+
+ // Update the instruction fragment.
+ IF.setInst(Relaxed);
+ IF.getCode() = Code;
+ IF.getFixups().clear();
+ // FIXME: Eliminate copy.
+ for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
+ IF.getFixups().push_back(Fixups[i]);
+
+ return true;
+}
+bool MCAssembler::relaxLEB(MCAsmLayout &Layout, MCLEBFragment &LF) {
+ int64_t Value = 0;
+ uint64_t OldSize = LF.getContents().size();
+ bool IsAbs = LF.getValue().EvaluateAsAbsolute(Value, Layout);
+ (void)IsAbs;
+ assert(IsAbs);
+ SmallString<8> &Data = LF.getContents();
+ Data.clear();
+ raw_svector_ostream OSE(Data);
+ if (LF.isSigned())
+ MCObjectWriter::EncodeSLEB128(Value, OSE);
+ else
+ MCObjectWriter::EncodeULEB128(Value, OSE);
+ OSE.flush();
+ return OldSize != LF.getContents().size();
+}
+
+bool MCAssembler::relaxDwarfLineAddr(MCAsmLayout &Layout,
+ MCDwarfLineAddrFragment &DF) {
+ int64_t AddrDelta = 0;
+ uint64_t OldSize = DF.getContents().size();
+ bool IsAbs = DF.getAddrDelta().EvaluateAsAbsolute(AddrDelta, Layout);
+ (void)IsAbs;
+ assert(IsAbs);
+ int64_t LineDelta;
+ LineDelta = DF.getLineDelta();
+ SmallString<8> &Data = DF.getContents();
+ Data.clear();
+ raw_svector_ostream OSE(Data);
+ MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OSE);
+ OSE.flush();
+ return OldSize != Data.size();
+}
+
+bool MCAssembler::relaxDwarfCallFrameFragment(MCAsmLayout &Layout,
+ MCDwarfCallFrameFragment &DF) {
+ int64_t AddrDelta = 0;
+ uint64_t OldSize = DF.getContents().size();
+ bool IsAbs = DF.getAddrDelta().EvaluateAsAbsolute(AddrDelta, Layout);
+ (void)IsAbs;
+ assert(IsAbs);
+ SmallString<8> &Data = DF.getContents();
+ Data.clear();
+ raw_svector_ostream OSE(Data);
+ MCDwarfFrameEmitter::EncodeAdvanceLoc(AddrDelta, OSE);
+ OSE.flush();
+ return OldSize != Data.size();
+}
+
+bool MCAssembler::layoutSectionOnce(MCAsmLayout &Layout,
+ MCSectionData &SD) {
+ MCFragment *FirstInvalidFragment = NULL;
// Scan for fragments that need relaxation.
+ for (MCSectionData::iterator it2 = SD.begin(),
+ ie2 = SD.end(); it2 != ie2; ++it2) {
+ // Check if this is an fragment that needs relaxation.
+ bool relaxedFrag = false;
+ switch(it2->getKind()) {
+ default:
+ break;
+ case MCFragment::FT_Inst:
+ relaxedFrag = relaxInstruction(Layout, *cast<MCInstFragment>(it2));
+ break;
+ case MCFragment::FT_Dwarf:
+ relaxedFrag = relaxDwarfLineAddr(Layout,
+ *cast<MCDwarfLineAddrFragment>(it2));
+ break;
+ case MCFragment::FT_DwarfFrame:
+ relaxedFrag =
+ relaxDwarfCallFrameFragment(Layout,
+ *cast<MCDwarfCallFrameFragment>(it2));
+ break;
+ case MCFragment::FT_LEB:
+ relaxedFrag = relaxLEB(Layout, *cast<MCLEBFragment>(it2));
+ break;
+ }
+ // Update the layout, and remember that we relaxed.
+ if (relaxedFrag && !FirstInvalidFragment)
+ FirstInvalidFragment = it2;
+ }
+ if (FirstInvalidFragment) {
+ Layout.Invalidate(FirstInvalidFragment);
+ return true;
+ }
+ return false;
+}
+
+bool MCAssembler::layoutOnce(MCAsmLayout &Layout) {
+ ++stats::RelaxationSteps;
+
bool WasRelaxed = false;
for (iterator it = begin(), ie = end(); it != ie; ++it) {
MCSectionData &SD = *it;
-
- for (MCSectionData::iterator it2 = SD.begin(),
- ie2 = SD.end(); it2 != ie2; ++it2) {
- // Check if this is an instruction fragment that needs relaxation.
- MCInstFragment *IF = dyn_cast<MCInstFragment>(it2);
- if (!IF || !FragmentNeedsRelaxation(IF, Layout))
- continue;
-
- ++stats::RelaxedInstructions;
-
- // FIXME-PERF: We could immediately lower out instructions if we can tell
- // they are fully resolved, to avoid retesting on later passes.
-
- // Relax the fragment.
-
- MCInst Relaxed;
- getBackend().RelaxInstruction(IF, Relaxed);
-
- // Encode the new instruction.
- //
- // FIXME-PERF: If it matters, we could let the target do this. It can
- // probably do so more efficiently in many cases.
- SmallVector<MCFixup, 4> Fixups;
- SmallString<256> Code;
- raw_svector_ostream VecOS(Code);
- getEmitter().EncodeInstruction(Relaxed, VecOS, Fixups);
- VecOS.flush();
-
- // Update the instruction fragment.
- int SlideAmount = Code.size() - IF->getInstSize();
- IF->setInst(Relaxed);
- IF->getCode() = Code;
- IF->getFixups().clear();
- for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
- MCFixup &F = Fixups[i];
- IF->getFixups().push_back(MCAsmFixup(F.getOffset(), *F.getValue(),
- F.getKind()));
- }
-
- // Update the layout, and remember that we relaxed. If we are relaxing
- // everything, we can skip this step since nothing will depend on updating
- // the values.
- if (!getRelaxAll())
- Layout.UpdateForSlide(IF, SlideAmount);
+ while(layoutSectionOnce(Layout, SD))
WasRelaxed = true;
- }
}
return WasRelaxed;
}
-void MCAssembler::FinishLayout(MCAsmLayout &Layout) {
- // Lower out any instruction fragments, to simplify the fixup application and
- // output.
- //
- // FIXME-PERF: We don't have to do this, but the assumption is that it is
- // cheap (we will mostly end up eliminating fragments and appending on to data
- // fragments), so the extra complexity downstream isn't worth it. Evaluate
- // this assumption.
- for (iterator it = begin(), ie = end(); it != ie; ++it) {
- MCSectionData &SD = *it;
-
- for (MCSectionData::iterator it2 = SD.begin(),
- ie2 = SD.end(); it2 != ie2; ++it2) {
- MCInstFragment *IF = dyn_cast<MCInstFragment>(it2);
- if (!IF)
- continue;
-
- // Create a new data fragment for the instruction.
- //
- // FIXME-PERF: Reuse previous data fragment if possible.
- MCDataFragment *DF = new MCDataFragment();
- SD.getFragmentList().insert(it2, DF);
-
- // Update the data fragments layout data.
- //
- // FIXME: Add MCAsmLayout utility for this.
- DF->setParent(IF->getParent());
- DF->setAtom(IF->getAtom());
- DF->setOrdinal(IF->getOrdinal());
- Layout.setFragmentOffset(DF, Layout.getFragmentOffset(IF));
- Layout.setFragmentEffectiveSize(DF, Layout.getFragmentEffectiveSize(IF));
-
- // Copy in the data and the fixups.
- DF->getContents().append(IF->getCode().begin(), IF->getCode().end());
- for (unsigned i = 0, e = IF->getFixups().size(); i != e; ++i)
- DF->getFixups().push_back(IF->getFixups()[i]);
-
- // Delete the instruction fragment and update the iterator.
- SD.getFragmentList().erase(IF);
- it2 = DF;
- }
+void MCAssembler::finishLayout(MCAsmLayout &Layout) {
+ // The layout is done. Mark every fragment as valid.
+ for (unsigned int i = 0, n = Layout.getSectionOrder().size(); i != n; ++i) {
+ Layout.getFragmentOffset(&*Layout.getSectionOrder()[i]->rbegin());
}
}
namespace llvm {
-raw_ostream &operator<<(raw_ostream &OS, const MCAsmFixup &AF) {
- OS << "<MCAsmFixup" << " Offset:" << AF.Offset << " Value:" << *AF.Value
- << " Kind:" << AF.Kind << ">";
+raw_ostream &operator<<(raw_ostream &OS, const MCFixup &AF) {
+ OS << "<MCFixup" << " Offset:" << AF.getOffset()
+ << " Value:" << *AF.getValue()
+ << " Kind:" << AF.getKind() << ">";
return OS;
}
void MCFragment::dump() {
raw_ostream &OS = llvm::errs();
- OS << "<MCFragment " << (void*) this << " Offset:" << Offset
- << " EffectiveSize:" << EffectiveSize;
-
- OS << ">";
-}
-
-void MCAlignFragment::dump() {
- raw_ostream &OS = llvm::errs();
-
- OS << "<MCAlignFragment ";
- this->MCFragment::dump();
- OS << "\n ";
- OS << " Alignment:" << getAlignment()
- << " Value:" << getValue() << " ValueSize:" << getValueSize()
- << " MaxBytesToEmit:" << getMaxBytesToEmit() << ">";
-}
+ OS << "<";
+ switch (getKind()) {
+ case MCFragment::FT_Align: OS << "MCAlignFragment"; break;
+ case MCFragment::FT_Data: OS << "MCDataFragment"; break;
+ case MCFragment::FT_Fill: OS << "MCFillFragment"; break;
+ case MCFragment::FT_Inst: OS << "MCInstFragment"; 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;
+ }
-void MCDataFragment::dump() {
- raw_ostream &OS = llvm::errs();
+ OS << "<MCFragment " << (void*) this << " LayoutOrder:" << LayoutOrder
+ << " Offset:" << Offset << ">";
- OS << "<MCDataFragment ";
- this->MCFragment::dump();
- OS << "\n ";
- OS << " Contents:[";
- for (unsigned i = 0, e = getContents().size(); i != e; ++i) {
- if (i) OS << ",";
- OS << hexdigit((Contents[i] >> 4) & 0xF) << hexdigit(Contents[i] & 0xF);
- }
- OS << "] (" << getContents().size() << " bytes)";
-
- if (!getFixups().empty()) {
- OS << ",\n ";
- OS << " Fixups:[";
- for (fixup_iterator it = fixup_begin(), ie = fixup_end(); it != ie; ++it) {
- if (it != fixup_begin()) OS << ",\n ";
- OS << *it;
+ 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->getFixups().empty()) {
+ 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 << "]";
}
- OS << "]";
+ 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_Inst: {
+ const MCInstFragment *IF = cast<MCInstFragment>(this);
+ OS << "\n ";
+ OS << " Inst:";
+ IF->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;
+ }
}
-
- OS << ">";
-}
-
-void MCFillFragment::dump() {
- raw_ostream &OS = llvm::errs();
-
- OS << "<MCFillFragment ";
- this->MCFragment::dump();
- OS << "\n ";
- OS << " Value:" << getValue() << " ValueSize:" << getValueSize()
- << " Size:" << getSize() << ">";
-}
-
-void MCInstFragment::dump() {
- raw_ostream &OS = llvm::errs();
-
- OS << "<MCInstFragment ";
- this->MCFragment::dump();
- OS << "\n ";
- OS << " Inst:";
- getInst().dump_pretty(OS);
OS << ">";
}
-void MCOrgFragment::dump() {
- raw_ostream &OS = llvm::errs();
-
- OS << "<MCOrgFragment ";
- this->MCFragment::dump();
- OS << "\n ";
- OS << " Offset:" << getOffset() << " Value:" << getValue() << ">";
-}
-
-void MCZeroFillFragment::dump() {
- raw_ostream &OS = llvm::errs();
-
- OS << "<MCZeroFillFragment ";
- this->MCFragment::dump();
- OS << "\n ";
- OS << " Size:" << getSize() << ">";
-}
-
void MCSectionData::dump() {
raw_ostream &OS = llvm::errs();
OS << "<MCSectionData";
- OS << " Alignment:" << getAlignment() << " Address:" << Address
- << " Size:" << Size << " FileSize:" << FileSize
- << " Fragments:[\n ";
+ OS << " Alignment:" << getAlignment() << " Fragments:[\n ";
for (iterator it = begin(), ie = end(); it != ie; ++it) {
if (it != begin()) OS << ",\n ";
it->dump();
}
OS << "]>\n";
}
+
+// anchors for MC*Fragment vtables
+void MCDataFragment::anchor() { }
+void MCInstFragment::anchor() { }
+void MCAlignFragment::anchor() { }
+void MCFillFragment::anchor() { }
+void MCOrgFragment::anchor() { }
+void MCLEBFragment::anchor() { }
+void MCDwarfLineAddrFragment::anchor() { }
+void MCDwarfCallFrameFragment::anchor() { }