X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCAssembler.cpp;h=06c8aec91917e54373f6a6c9dba779cc4bb1932e;hb=586a55a29089c6128f843cd331fed210c480ed0a;hp=0a9783d885d7eb05241998f5e411491d57b92406;hpb=5d2477cecf53bef911f57423a5cecb743d4286fa;p=oota-llvm.git diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp index 0a9783d885d..06c8aec9191 100644 --- a/lib/MC/MCAssembler.cpp +++ b/lib/MC/MCAssembler.cpp @@ -11,12 +11,14 @@ #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/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" @@ -24,10 +26,8 @@ #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 using namespace llvm; namespace { @@ -102,6 +102,33 @@ uint64_t MCAsmLayout::getFragmentOffset(const MCFragment *F) const { } 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; + } + assert(SD->getFragment() && "Invalid getOffset() on undefined symbol!"); return getFragmentOffset(SD->getFragment()) + SD->getOffset(); } @@ -109,7 +136,7 @@ uint64_t MCAsmLayout::getSymbolOffset(const MCSymbolData *SD) const { 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(F); + return getFragmentOffset(&F) + getAssembler().ComputeFragmentSize(*this, F); } uint64_t MCAsmLayout::getSectionFileSize(const MCSectionData *SD) const { @@ -167,11 +194,11 @@ MCSymbolData::MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment, /* *** */ -MCAssembler::MCAssembler(MCContext &Context_, TargetAsmBackend &Backend_, +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), SubsectionsViaSymbols(false) + OS(OS_), RelaxAll(false), NoExecStack(false), SubsectionsViaSymbols(false) { } @@ -215,25 +242,42 @@ bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout, MCValue &Target, uint64_t &Value) const { ++stats::EvaluateFixup; - if (!Fixup.getValue()->EvaluateAsRelocatable(Target, &Layout)) + if (!Fixup.getValue()->EvaluateAsRelocatable(Target, Layout)) report_fatal_error("expected relocatable expression"); - // 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 IsPCRel = Backend.getFixupKindInfo( + Fixup.getKind()).Flags & MCFixupKindInfo::FKF_IsPCRel; + + 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 = Backend.getFixupKindInfo( - Fixup.getKind()).Flags & MCFixupKindInfo::FKF_IsPCRel; - bool IsResolved = true; bool IsThumb = false; if (const MCSymbolRefExpr *A = Target.getSymA()) { const MCSymbol &Sym = A->getSymbol().AliasedSymbol(); if (Sym.isDefined()) Value += Layout.getSymbolOffset(&getSymbolData(Sym)); - else - IsResolved = false; if (isThumbFunc(&Sym)) IsThumb = true; } @@ -241,12 +285,8 @@ bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout, const MCSymbol &Sym = B->getSymbol().AliasedSymbol(); if (Sym.isDefined()) Value -= Layout.getSymbolOffset(&getSymbolData(Sym)); - else - IsResolved = false; } - if (IsResolved) - IsResolved = getWriter().IsFixupFullyResolved(*this, Target, IsPCRel, DF); bool ShouldAlignPC = Backend.getFixupKindInfo(Fixup.getKind()).Flags & MCFixupKindInfo::FKF_IsAlignedDownTo32Bits; @@ -254,12 +294,12 @@ bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout, "FKF_IsAlignedDownTo32Bits is only allowed on PC-relative fixups!"); if (IsPCRel) { - uint32_t Offset = Fixup.getOffset(); + 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 -= Layout.getFragmentOffset(DF) + Offset; + Value -= Offset; } // ARM fixups based from a thumb function address need to have the low @@ -272,7 +312,8 @@ bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout, return IsResolved; } -uint64_t MCAssembler::ComputeFragmentSize(const MCFragment &F) const { +uint64_t MCAssembler::ComputeFragmentSize(const MCAsmLayout &Layout, + const MCFragment &F) const { switch (F.getKind()) { case MCFragment::FT_Data: return cast(F).getContents().size(); @@ -284,14 +325,34 @@ uint64_t MCAssembler::ComputeFragmentSize(const MCFragment &F) const { case MCFragment::FT_LEB: return cast(F).getContents().size(); - case MCFragment::FT_Align: - return cast(F).getSize(); + case MCFragment::FT_Align: { + const MCAlignFragment &AF = cast(F); + unsigned Offset = Layout.getFragmentOffset(&AF); + unsigned Size = OffsetToAlignment(Offset, AF.getAlignment()); + if (Size > AF.getMaxBytesToEmit()) + return 0; + return Size; + } - case MCFragment::FT_Org: - return cast(F).getSize(); + case MCFragment::FT_Org: { + MCOrgFragment &OF = cast(F); + int64_t TargetLocation; + if (!OF.getOffset().EvaluateAsAbsolute(TargetLocation, Layout)) + report_fatal_error("expected assembly-time absolute expression"); + + // FIXME: We need a way to communicate this error. + 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) + "')"); + return Size; + } case MCFragment::FT_Dwarf: return cast(F).getContents().size(); + case MCFragment::FT_DwarfFrame: + return cast(F).getContents().size(); } assert(0 && "invalid fragment kind"); @@ -313,7 +374,7 @@ void MCAsmLayout::LayoutFragment(MCFragment *F) { // Compute fragment offset and size. uint64_t Offset = 0; if (Prev) - Offset += Prev->Offset + getAssembler().ComputeFragmentSize(*Prev); + Offset += Prev->Offset + getAssembler().ComputeFragmentSize(*this, *Prev); F->Offset = Offset; LastValidFragment[F->getParent()] = F; @@ -329,7 +390,7 @@ static void WriteFragmentData(const MCAssembler &Asm, const MCAsmLayout &Layout, ++stats::EmittedFragments; // FIXME: Embed in fragments instead? - uint64_t FragmentSize = Asm.ComputeFragmentSize(F); + uint64_t FragmentSize = Asm.ComputeFragmentSize(Layout, F); switch (F.getKind()) { case MCFragment::FT_Align: { MCAlignFragment &AF = cast(F); @@ -422,6 +483,11 @@ static void WriteFragmentData(const MCAssembler &Asm, const MCAsmLayout &Layout, OW->WriteBytes(OF.getContents().str()); break; } + case MCFragment::FT_DwarfFrame: { + const MCDwarfCallFrameFragment &CF = cast(F); + OW->WriteBytes(CF.getContents().str()); + break; + } } assert(OW->getStream().tell() - Start == FragmentSize); @@ -649,27 +715,12 @@ bool MCAssembler::RelaxInstruction(MCAsmLayout &Layout, return true; } -bool MCAssembler::RelaxOrg(MCAsmLayout &Layout, MCOrgFragment &OF) { - int64_t TargetLocation; - if (!OF.getOffset().EvaluateAsAbsolute(TargetLocation, Layout)) - report_fatal_error("expected assembly-time absolute expression"); - - // FIXME: We need a way to communicate this error. - uint64_t FragmentOffset = Layout.getFragmentOffset(&OF); - int64_t Offset = TargetLocation - FragmentOffset; - if (Offset < 0 || Offset >= 0x40000000) - report_fatal_error("invalid .org offset '" + Twine(TargetLocation) + - "' (at offset '" + Twine(FragmentOffset) + "')"); - - unsigned OldSize = OF.getSize(); - OF.setSize(Offset); - return OldSize != OF.getSize(); -} - bool MCAssembler::RelaxLEB(MCAsmLayout &Layout, MCLEBFragment &LF) { int64_t Value = 0; uint64_t OldSize = LF.getContents().size(); - LF.getValue().EvaluateAsAbsolute(Value, Layout); + bool IsAbs = LF.getValue().EvaluateAsAbsolute(Value, Layout); + (void)IsAbs; + assert(IsAbs); SmallString<8> &Data = LF.getContents(); Data.clear(); raw_svector_ostream OSE(Data); @@ -685,7 +736,9 @@ bool MCAssembler::RelaxDwarfLineAddr(MCAsmLayout &Layout, MCDwarfLineAddrFragment &DF) { int64_t AddrDelta = 0; uint64_t OldSize = DF.getContents().size(); - DF.getAddrDelta().EvaluateAsAbsolute(AddrDelta, Layout); + bool IsAbs = DF.getAddrDelta().EvaluateAsAbsolute(AddrDelta, Layout); + (void)IsAbs; + assert(IsAbs); int64_t LineDelta; LineDelta = DF.getLineDelta(); SmallString<8> &Data = DF.getContents(); @@ -696,57 +749,67 @@ bool MCAssembler::RelaxDwarfLineAddr(MCAsmLayout &Layout, return OldSize != Data.size(); } -bool MCAssembler::RelaxAlignment(MCAsmLayout &Layout, - MCAlignFragment &AF) { - unsigned Offset = Layout.getFragmentOffset(&AF); - unsigned Size = OffsetToAlignment(Offset, AF.getAlignment()); - if (Size > AF.getMaxBytesToEmit()) - Size = 0; - unsigned OldSize = AF.getSize(); - AF.setSize(Size); - return OldSize != 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(it2)); + break; + case MCFragment::FT_Dwarf: + relaxedFrag = RelaxDwarfLineAddr(Layout, + *cast(it2)); + break; + case MCFragment::FT_DwarfFrame: + relaxedFrag = + RelaxDwarfCallFrameFragment(Layout, + *cast(it2)); + break; + case MCFragment::FT_LEB: + relaxedFrag = RelaxLEB(Layout, *cast(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; - // Scan for fragments that need relaxation. bool WasRelaxed = false; for (iterator it = begin(), ie = end(); it != ie; ++it) { MCSectionData &SD = *it; - MCFragment *FirstInvalidFragment = NULL; - - 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_Align: - relaxedFrag = RelaxAlignment(Layout, *cast(it2)); - break; - case MCFragment::FT_Inst: - relaxedFrag = RelaxInstruction(Layout, *cast(it2)); - break; - case MCFragment::FT_Org: - relaxedFrag = RelaxOrg(Layout, *cast(it2)); - break; - case MCFragment::FT_Dwarf: - relaxedFrag = RelaxDwarfLineAddr(Layout, - *cast(it2)); - break; - case MCFragment::FT_LEB: - relaxedFrag = RelaxLEB(Layout, *cast(it2)); - break; - } - // Update the layout, and remember that we relaxed. - if (relaxedFrag && !FirstInvalidFragment) - FirstInvalidFragment = it2; - WasRelaxed |= relaxedFrag; - } - if (FirstInvalidFragment) - Layout.Invalidate(FirstInvalidFragment); + while(LayoutSectionOnce(Layout, SD)) + WasRelaxed = true; } return WasRelaxed; @@ -783,6 +846,7 @@ void MCFragment::dump() { 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; } @@ -849,6 +913,12 @@ void MCFragment::dump() { << " LineDelta:" << OF->getLineDelta(); break; } + case MCFragment::FT_DwarfFrame: { + const MCDwarfCallFrameFragment *CF = cast(this); + OS << "\n "; + OS << " AddrDelta:" << CF->getAddrDelta(); + break; + } case MCFragment::FT_LEB: { const MCLEBFragment *LF = cast(this); OS << "\n ";