#define DEBUG_TYPE "assembler"
#include "llvm/MC/MCAssembler.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCDwarf.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/MC/MCDwarf.h"
-#include "llvm/MC/MCAsmBackend.h"
-#include "llvm/ADT/OwningPtr.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/Support/LEB128.h"
#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
namespace stats {
-STATISTIC(EmittedFragments, "Number of emitted assembler fragments");
+STATISTIC(EmittedFragments, "Number of emitted assembler fragments - total");
+STATISTIC(EmittedInstFragments,
+ "Number of emitted assembler fragments - instruction");
+STATISTIC(EmittedDataFragments,
+ "Number of emitted assembler fragments - data");
+STATISTIC(EmittedAlignFragments,
+ "Number of emitted assembler fragments - align");
+STATISTIC(EmittedFillFragments,
+ "Number of emitted assembler fragments - fill");
+STATISTIC(EmittedOrgFragments,
+ "Number of emitted assembler fragments - org");
STATISTIC(evaluateFixup, "Number of evaluated fixups");
STATISTIC(FragmentLayouts, "Number of fragment layouts");
STATISTIC(ObjectBytes, "Number of emitted object file bytes");
SectionOrder.push_back(&*it);
}
-bool MCAsmLayout::isFragmentUpToDate(const MCFragment *F) const {
+bool MCAsmLayout::isFragmentValid(const MCFragment *F) const {
const MCSectionData &SD = *F->getParent();
const MCFragment *LastValid = LastValidFragment.lookup(&SD);
if (!LastValid)
return F->getLayoutOrder() <= LastValid->getLayoutOrder();
}
-void MCAsmLayout::Invalidate(MCFragment *F) {
- // If this fragment wasn't already up-to-date, we don't need to do anything.
- if (!isFragmentUpToDate(F))
+void MCAsmLayout::invalidateFragmentsAfter(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 this fragment.
LastValidFragment[&SD] = F;
}
-void MCAsmLayout::EnsureValid(const MCFragment *F) const {
+void MCAsmLayout::ensureValid(const MCFragment *F) const {
MCSectionData &SD = *F->getParent();
MCFragment *Cur = LastValidFragment[&SD];
else
Cur = Cur->getNextNode();
- // Advance the layout position until the fragment is up-to-date.
- while (!isFragmentUpToDate(F)) {
- const_cast<MCAsmLayout*>(this)->LayoutFragment(Cur);
+ // Advance the layout position until the fragment is valid.
+ while (!isFragmentValid(F)) {
+ assert(Cur && "Layout bookkeeping error");
+ const_cast<MCAsmLayout*>(this)->layoutFragment(Cur);
Cur = Cur->getNextNode();
}
}
uint64_t MCAsmLayout::getFragmentOffset(const MCFragment *F) const {
- EnsureValid(F);
+ ensureValid(F);
assert(F->Offset != ~UINT64_C(0) && "Address not set!");
return F->Offset;
}
/* *** */
+MCEncodedFragment::~MCEncodedFragment() {
+}
+
+/* *** */
+
MCSectionData::MCSectionData() : Section(0) {}
MCSectionData::MCSectionData(const MCSection &_Section, MCAssembler *A)
MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
raw_ostream &OS_)
: Context(Context_), Backend(Backend_), Emitter(Emitter_), Writer(Writer_),
- OS(OS_), RelaxAll(false), NoExecStack(false), SubsectionsViaSymbols(false)
-{
+ OS(OS_), RelaxAll(false), NoExecStack(false), SubsectionsViaSymbols(false) {
}
MCAssembler::~MCAssembler() {
}
+void MCAssembler::reset() {
+ Sections.clear();
+ Symbols.clear();
+ SectionMap.clear();
+ SymbolMap.clear();
+ IndirectSymbols.clear();
+ DataRegions.clear();
+ ThumbFuncs.clear();
+ RelaxAll = false;
+ NoExecStack = false;
+ SubsectionsViaSymbols = false;
+
+ // reset objects owned by us
+ getBackend().reset();
+ getEmitter().reset();
+ getWriter().reset();
+}
+
bool MCAssembler::isSymbolLinkerVisible(const MCSymbol &Symbol) const {
// Non-temporary labels should always be visible to the linker.
if (!Symbol.isTemporary())
++stats::evaluateFixup;
if (!Fixup.getValue()->EvaluateAsRelocatable(Target, Layout))
- report_fatal_error("expected relocatable expression");
+ getContext().FatalError(Fixup.getLoc(), "expected relocatable expression");
bool IsPCRel = Backend.getFixupKindInfo(
Fixup.getKind()).Flags & MCFixupKindInfo::FKF_IsPCRel;
Value = Target.getConstant();
- bool IsThumb = false;
if (const MCSymbolRefExpr *A = Target.getSymA()) {
const MCSymbol &Sym = A->getSymbol().AliasedSymbol();
if (Sym.isDefined())
Value += Layout.getSymbolOffset(&getSymbolData(Sym));
- if (isThumbFunc(&Sym))
- IsThumb = true;
}
if (const MCSymbolRefExpr *B = Target.getSymB()) {
const MCSymbol &Sym = B->getSymbol().AliasedSymbol();
Value -= Offset;
}
- // ARM fixups based from a thumb function address need to have the low
- // bit set. The actual value is always at least 16-bit aligned, so the
- // low bit is normally clear and available for use as an ISA flag for
- // interworking.
- if (IsThumb)
- Value |= 1;
+ // 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;
}
const MCAlignFragment &AF = cast<MCAlignFragment>(F);
unsigned Offset = Layout.getFragmentOffset(&AF);
unsigned Size = OffsetToAlignment(Offset, AF.getAlignment());
+ // If we are padding with nops, force the padding to be larger than the
+ // minimum nop size.
+ if (Size > 0 && AF.hasEmitNops()) {
+ while (Size % getBackend().getMinimumNopSize())
+ Size += AF.getAlignment();
+ }
if (Size > AF.getMaxBytesToEmit())
return 0;
return Size;
return cast<MCDwarfCallFrameFragment>(F).getContents().size();
}
- assert(0 && "invalid fragment kind");
- return 0;
+ llvm_unreachable("invalid fragment kind");
}
-void MCAsmLayout::LayoutFragment(MCFragment *F) {
+void MCAsmLayout::layoutFragment(MCFragment *F) {
MCFragment *Prev = F->getPrevNode();
- // 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!");
+ // We should never try to recompute something which is valid.
+ assert(!isFragmentValid(F) && "Attempt to recompute a valid fragment!");
+ // We should never try to compute the fragment layout if its predecessor
+ // isn't valid.
+ assert((!Prev || isFragmentValid(Prev)) &&
+ "Attempt to compute fragment before its predecessor!");
++stats::FragmentLayouts;
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) {
+/// \brief Write the contents of a fragment to the given object writer. Expects
+/// a MCEncodedFragment.
+static void writeFragmentContents(const MCFragment &F, MCObjectWriter *OW) {
+ MCEncodedFragment &EF = cast<MCEncodedFragment>(F);
+ OW->WriteBytes(EF.getContents());
+}
+
+/// \brief Write the fragment \p F to the output file.
+static void writeFragment(const MCAssembler &Asm, const MCAsmLayout &Layout,
+ const MCFragment &F) {
MCObjectWriter *OW = &Asm.getWriter();
uint64_t Start = OW->getStream().tell();
(void) Start;
uint64_t FragmentSize = Asm.computeFragmentSize(Layout, F);
switch (F.getKind()) {
case MCFragment::FT_Align: {
+ ++stats::EmittedAlignFragments;
MCAlignFragment &AF = cast<MCAlignFragment>(F);
uint64_t Count = FragmentSize / AF.getValueSize();
// See if we are aligning with nops, and if so do that first to try to fill
// 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.
+ // bytes left to fill use the Value and ValueSize to fill the rest.
// If we are aligning with nops, ask that target to emit the right data.
if (AF.hasEmitNops()) {
- if (!Asm.getBackend().WriteNopData(Count, OW))
+ 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;
break;
}
- case MCFragment::FT_Data: {
- MCDataFragment &DF = cast<MCDataFragment>(F);
- assert(FragmentSize == DF.getContents().size() && "Invalid size!");
- OW->WriteBytes(DF.getContents().str());
+ case MCFragment::FT_Data:
+ ++stats::EmittedDataFragments;
+ writeFragmentContents(F, OW);
+ break;
+
+ case MCFragment::FT_Inst:
+ ++stats::EmittedInstFragments;
+ writeFragmentContents(F, OW);
break;
- }
case MCFragment::FT_Fill: {
+ ++stats::EmittedFillFragments;
MCFillFragment &FF = cast<MCFillFragment>(F);
assert(FF.getValueSize() && "Invalid virtual align in concrete fragment!");
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: {
- 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());
}
case MCFragment::FT_Org: {
+ ++stats::EmittedOrgFragments;
MCOrgFragment &OF = cast<MCOrgFragment>(F);
for (uint64_t i = 0, e = FragmentSize; i != e; ++i)
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
}
uint64_t Start = getWriter().getStream().tell();
- (void) Start;
+ (void)Start;
- for (MCSectionData::const_iterator it = SD->begin(),
- ie = SD->end(); it != ie; ++it)
- WriteFragmentData(*this, Layout, *it);
+ for (MCSectionData::const_iterator it = SD->begin(), ie = SD->end();
+ it != ie; ++it)
+ writeFragment(*this, Layout, *it);
assert(getWriter().getStream().tell() - Start ==
Layout.getSectionAddressSize(SD));
SD->setLayoutOrder(i);
unsigned FragmentIndex = 0;
- for (MCSectionData::iterator it2 = SD->begin(),
- ie2 = SD->end(); it2 != ie2; ++it2)
- it2->setLayoutOrder(FragmentIndex++);
+ for (MCSectionData::iterator iFrag = SD->begin(), iFragEnd = SD->end();
+ iFrag != iFragEnd; ++iFrag)
+ iFrag->setLayoutOrder(FragmentIndex++);
}
// Layout until everything fits.
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) {
- for (MCDataFragment::fixup_iterator it3 = DF->fixup_begin(),
- ie3 = DF->fixup_end(); it3 != ie3; ++it3) {
+ MCEncodedFragment *F = dyn_cast<MCEncodedFragment>(it2);
+ if (F) {
+ for (MCEncodedFragment::fixup_iterator it3 = F->fixup_begin(),
+ ie3 = F->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);
+ uint64_t FixedValue = handleFixup(Layout, *F, Fixup);
+ getBackend().applyFixup(Fixup, F->getContents().data(),
+ F->getContents().size(), FixedValue);
}
}
}
}
bool MCAssembler::fixupNeedsRelaxation(const MCFixup &Fixup,
- const MCFragment *DF,
+ 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))
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,
// 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 (!getBackend().mayNeedRelaxation(IF->getInst()))
return false;
for (MCInstFragment::const_fixup_iterator it = IF->fixup_begin(),
- ie = IF->fixup_end(); it != ie; ++it)
+ ie = IF->fixup_end(); it != ie; ++it)
if (fixupNeedsRelaxation(*it, IF, Layout))
return true;
// Relax the fragment.
MCInst Relaxed;
- getBackend().RelaxInstruction(IF.getInst(), Relaxed);
+ getBackend().relaxInstruction(IF.getInst(), Relaxed);
// Encode the new instruction.
//
// 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]);
+ IF.getContents() = Code;
+ IF.getFixups() = Fixups;
return true;
}
Data.clear();
raw_svector_ostream OSE(Data);
if (LF.isSigned())
- MCObjectWriter::EncodeSLEB128(Value, OSE);
+ encodeSLEB128(Value, OSE);
else
- MCObjectWriter::EncodeULEB128(Value, OSE);
+ encodeULEB128(Value, OSE);
OSE.flush();
return OldSize != LF.getContents().size();
}
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()) {
+bool MCAssembler::layoutSectionOnce(MCAsmLayout &Layout, MCSectionData &SD) {
+ // Holds the first fragment which needed relaxing during this layout. It will
+ // remain NULL if none were relaxed.
+ // When a fragment is relaxed, all the fragments following it should get
+ // invalidated because their offset is going to change.
+ MCFragment *FirstRelaxedFragment = NULL;
+
+ // Attempt to relax all the fragments in the section.
+ for (MCSectionData::iterator I = SD.begin(), IE = SD.end(); I != IE; ++I) {
+ // Check if this is a fragment that needs relaxation.
+ bool RelaxedFrag = false;
+ switch(I->getKind()) {
default:
- break;
+ break;
case MCFragment::FT_Inst:
- relaxedFrag = relaxInstruction(Layout, *cast<MCInstFragment>(it2));
+ assert(!getRelaxAll() &&
+ "Did not expect a MCInstFragment in RelaxAll mode");
+ RelaxedFrag = relaxInstruction(Layout, *cast<MCInstFragment>(I));
break;
case MCFragment::FT_Dwarf:
- relaxedFrag = relaxDwarfLineAddr(Layout,
- *cast<MCDwarfLineAddrFragment>(it2));
+ RelaxedFrag = relaxDwarfLineAddr(Layout,
+ *cast<MCDwarfLineAddrFragment>(I));
break;
case MCFragment::FT_DwarfFrame:
- relaxedFrag =
+ RelaxedFrag =
relaxDwarfCallFrameFragment(Layout,
- *cast<MCDwarfCallFrameFragment>(it2));
+ *cast<MCDwarfCallFrameFragment>(I));
break;
case MCFragment::FT_LEB:
- relaxedFrag = relaxLEB(Layout, *cast<MCLEBFragment>(it2));
+ RelaxedFrag = relaxLEB(Layout, *cast<MCLEBFragment>(I));
break;
}
- // Update the layout, and remember that we relaxed.
- if (relaxedFrag && !FirstInvalidFragment)
- FirstInvalidFragment = it2;
+ if (RelaxedFrag && !FirstRelaxedFragment)
+ FirstRelaxedFragment = I;
}
- if (FirstInvalidFragment) {
- Layout.Invalidate(FirstInvalidFragment);
+ if (FirstRelaxedFragment) {
+ Layout.invalidateFragmentsAfter(FirstRelaxedFragment);
return true;
}
return false;
bool WasRelaxed = false;
for (iterator it = begin(), ie = end(); it != ie; ++it) {
MCSectionData &SD = *it;
- while(layoutSectionOnce(Layout, SD))
+ while (layoutSectionOnce(Layout, SD))
WasRelaxed = true;
}
}
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void MCFragment::dump() {
raw_ostream &OS = llvm::errs();
}
OS << "] (" << Contents.size() << " bytes)";
- if (!DF->getFixups().empty()) {
+ if (DF->fixup_begin() != DF->fixup_end()) {
OS << ",\n ";
OS << " Fixups:[";
for (MCDataFragment::const_fixup_iterator it = DF->fixup_begin(),
}
OS << "]>\n";
}
+#endif
+
+// anchors for MC*Fragment vtables
+void MCEncodedFragment::anchor() { }
+void MCDataFragment::anchor() { }
+void MCInstFragment::anchor() { }
+void MCAlignFragment::anchor() { }
+void MCFillFragment::anchor() { }
+void MCOrgFragment::anchor() { }
+void MCLEBFragment::anchor() { }
+void MCDwarfLineAddrFragment::anchor() { }
+void MCDwarfCallFrameFragment::anchor() { }
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