[llvm] r173939 - Override virtual function for ARM EH directives.
Logan Chien
tzuhsiang.chien at gmail.com
Wed Jan 30 07:56:55 PST 2013
Oops. Sorry for missing them. Committed them in r173941. I'm sorry for
the breakage.
Logan
On Wed, Jan 30, 2013 at 11:42 PM, Anton Korobeynikov <
anton at korobeynikov.info> wrote:
> Hi Logan,
>
> Looks like you forgot to add the file :)
>
> On Wed, Jan 30, 2013 at 7:39 PM, Logan Chien <tzuhsiang.chien at gmail.com>
> wrote:
> > Author: logan
> > Date: Wed Jan 30 09:39:04 2013
> > New Revision: 173939
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=173939&view=rev
> > Log:
> > Override virtual function for ARM EH directives.
> >
> >
> > Modified:
> > llvm/trunk/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
> >
> > Modified: llvm/trunk/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp?rev=173939&r1=173938&r2=173939&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp (original)
> > +++ llvm/trunk/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp Wed Jan 30
> 09:39:04 2013
> > @@ -13,6 +13,7 @@
> > //
> >
> //===----------------------------------------------------------------------===//
> >
> > +#include "ARMUnwindOp.h"
> > #include "llvm/ADT/SmallPtrSet.h"
> > #include "llvm/ADT/Twine.h"
> > #include "llvm/MC/MCAsmBackend.h"
> > @@ -56,11 +57,25 @@ public:
> > ARMELFStreamer(MCContext &Context, MCAsmBackend &TAB,
> > raw_ostream &OS, MCCodeEmitter *Emitter, bool IsThumb)
> > : MCELFStreamer(Context, TAB, OS, Emitter),
> > - IsThumb(IsThumb), MappingSymbolCounter(0), LastEMS(EMS_None) {
> > + IsThumb(IsThumb), MappingSymbolCounter(0), LastEMS(EMS_None),
> > + ExTab(0), FnStart(0), Personality(0), CantUnwind(false) {
> > }
> >
> > ~ARMELFStreamer() {}
> >
> > + // ARM exception handling directives
> > + virtual void EmitFnStart();
> > + virtual void EmitFnEnd();
> > + virtual void EmitCantUnwind();
> > + virtual void EmitPersonality(const MCSymbol *Per);
> > + virtual void EmitHandlerData();
> > + virtual void EmitSetFP(unsigned NewFpReg,
> > + unsigned NewSpReg,
> > + int64_t Offset = 0);
> > + virtual void EmitPad(int64_t Offset);
> > + virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
> > + bool isVector);
> > +
> > virtual void ChangeSection(const MCSection *Section) {
> > // We have to keep track of the mapping symbol state of any
> sections we
> > // use. Each one should start off as EMS_None, which is provided as
> the
> > @@ -172,6 +187,15 @@ private:
> > SD.setFlags(SD.getFlags() | ELF_Other_ThumbFunc);
> > }
> >
> > + // Helper functions for ARM exception handling directives
> > + void Reset();
> > +
> > + void EmitPersonalityFixup(StringRef Name);
> > +
> > + void SwitchToEHSection(const char *Prefix, unsigned Type, unsigned
> Flags,
> > + SectionKind Kind, const MCSymbol &Fn);
> > + void SwitchToExTabSection(const MCSymbol &FnStart);
> > + void SwitchToExIdxSection(const MCSymbol &FnStart);
> >
> > bool IsThumb;
> > int64_t MappingSymbolCounter;
> > @@ -179,10 +203,200 @@ private:
> > DenseMap<const MCSection *, ElfMappingSymbol> LastMappingSymbols;
> > ElfMappingSymbol LastEMS;
> >
> > - /// @}
> > + // ARM Exception Handling Frame Information
> > + MCSymbol *ExTab;
> > + MCSymbol *FnStart;
> > + const MCSymbol *Personality;
> > + bool CantUnwind;
> > };
> > }
> >
> > +inline void ARMELFStreamer::SwitchToEHSection(const char *Prefix,
> > + unsigned Type,
> > + unsigned Flags,
> > + SectionKind Kind,
> > + const MCSymbol &Fn) {
> > + const MCSectionELF &FnSection =
> > + static_cast<const MCSectionELF &>(Fn.getSection());
> > +
> > + // Create the name for new section
> > + StringRef FnSecName(FnSection.getSectionName());
> > + SmallString<128> EHSecName(Prefix);
> > + if (FnSecName != ".text") {
> > + EHSecName += FnSecName;
> > + }
> > +
> > + // Get .ARM.extab or .ARM.exidx section
> > + const MCSectionELF *EHSection = NULL;
> > + if (const MCSymbol *Group = FnSection.getGroup()) {
> > + EHSection = getContext().getELFSection(
> > + EHSecName, Type, Flags | ELF::SHF_GROUP, Kind,
> > + FnSection.getEntrySize(), Group->getName());
> > + } else {
> > + EHSection = getContext().getELFSection(EHSecName, Type, Flags,
> Kind);
> > + }
> > + assert(EHSection);
> > +
> > + // Switch to .ARM.extab or .ARM.exidx section
> > + SwitchSection(EHSection);
> > + EmitCodeAlignment(4, 0);
> > +}
> > +
> > +inline void ARMELFStreamer::SwitchToExTabSection(const MCSymbol
> &FnStart) {
> > + SwitchToEHSection(".ARM.extab",
> > + ELF::SHT_PROGBITS,
> > + ELF::SHF_ALLOC,
> > + SectionKind::getDataRel(),
> > + FnStart);
> > +}
> > +
> > +inline void ARMELFStreamer::SwitchToExIdxSection(const MCSymbol
> &FnStart) {
> > + SwitchToEHSection(".ARM.exidx",
> > + ELF::SHT_ARM_EXIDX,
> > + ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER,
> > + SectionKind::getDataRel(),
> > + FnStart);
> > +}
> > +
> > +void ARMELFStreamer::Reset() {
> > + ExTab = NULL;
> > + FnStart = NULL;
> > + Personality = NULL;
> > + CantUnwind = false;
> > +}
> > +
> > +// Add the R_ARM_NONE fixup at the same position
> > +void ARMELFStreamer::EmitPersonalityFixup(StringRef Name) {
> > + const MCSymbol *PersonalitySym = getContext().GetOrCreateSymbol(Name);
> > +
> > + const MCSymbolRefExpr *PersonalityRef =
> > + MCSymbolRefExpr::Create(PersonalitySym,
> > + MCSymbolRefExpr::VK_ARM_NONE,
> > + getContext());
> > +
> > + AddValueSymbols(PersonalityRef);
> > + MCDataFragment *DF = getOrCreateDataFragment();
> > + DF->getFixups().push_back(
> > + MCFixup::Create(DF->getContents().size(), PersonalityRef,
> > + MCFixup::getKindForSize(4, false)));
> > +}
> > +
> > +void ARMELFStreamer::EmitFnStart() {
> > + assert(FnStart == 0);
> > + FnStart = getContext().CreateTempSymbol();
> > + EmitLabel(FnStart);
> > +}
> > +
> > +void ARMELFStreamer::EmitFnEnd() {
> > + assert(FnStart && ".fnstart must preceeds .fnend");
> > +
> > + // Emit unwind opcodes if there is no .handlerdata directive
> > + int PersonalityIndex = -1;
> > + if (!ExTab && !CantUnwind) {
> > + // For __aeabi_unwind_cpp_pr1, we have to emit opcodes in
> .ARM.extab.
> > + SwitchToExTabSection(*FnStart);
> > +
> > + // Create .ARM.extab label for offset in .ARM.exidx
> > + ExTab = getContext().CreateTempSymbol();
> > + EmitLabel(ExTab);
> > +
> > + PersonalityIndex = 1;
> > +
> > + uint32_t Entry = 0;
> > + uint32_t NumExtraEntryWords = 0;
> > + Entry |= NumExtraEntryWords << 24;
> > + Entry |= (EHT_COMPACT | PersonalityIndex) << 16;
> > +
> > + // TODO: This should be generated according to .save, .vsave, .setfp
> > + // directives. Currently, we are simply generating FINISH opcode.
> > + Entry |= UNWIND_OPCODE_FINISH << 8;
> > + Entry |= UNWIND_OPCODE_FINISH;
> > +
> > + EmitIntValue(Entry, 4, 0);
> > + }
> > +
> > + // Emit the exception index table entry
> > + SwitchToExIdxSection(*FnStart);
> > +
> > + if (PersonalityIndex == 1)
> > + EmitPersonalityFixup("__aeabi_unwind_cpp_pr1");
> > +
> > + const MCSymbolRefExpr *FnStartRef =
> > + MCSymbolRefExpr::Create(FnStart,
> > + MCSymbolRefExpr::VK_ARM_PREL31,
> > + getContext());
> > +
> > + EmitValue(FnStartRef, 4, 0);
> > +
> > + if (CantUnwind) {
> > + EmitIntValue(EXIDX_CANTUNWIND, 4, 0);
> > + } else {
> > + const MCSymbolRefExpr *ExTabEntryRef =
> > + MCSymbolRefExpr::Create(ExTab,
> > + MCSymbolRefExpr::VK_ARM_PREL31,
> > + getContext());
> > + EmitValue(ExTabEntryRef, 4, 0);
> > + }
> > +
> > + // Clean exception handling frame information
> > + Reset();
> > +}
> > +
> > +void ARMELFStreamer::EmitCantUnwind() {
> > + CantUnwind = true;
> > +}
> > +
> > +void ARMELFStreamer::EmitHandlerData() {
> > + SwitchToExTabSection(*FnStart);
> > +
> > + // Create .ARM.extab label for offset in .ARM.exidx
> > + assert(!ExTab);
> > + ExTab = getContext().CreateTempSymbol();
> > + EmitLabel(ExTab);
> > +
> > + // Emit Personality
> > + assert(Personality && ".personality directive must preceed
> .handlerdata");
> > +
> > + const MCSymbolRefExpr *PersonalityRef =
> > + MCSymbolRefExpr::Create(Personality,
> > + MCSymbolRefExpr::VK_ARM_PREL31,
> > + getContext());
> > +
> > + EmitValue(PersonalityRef, 4, 0);
> > +
> > + // Emit unwind opcodes
> > + uint32_t Entry = 0;
> > + uint32_t NumExtraEntryWords = 0;
> > +
> > + // TODO: This should be generated according to .save, .vsave, .setfp
> > + // directives. Currently, we are simply generating FINISH opcode.
> > + Entry |= NumExtraEntryWords << 24;
> > + Entry |= UNWIND_OPCODE_FINISH << 16;
> > + Entry |= UNWIND_OPCODE_FINISH << 8;
> > + Entry |= UNWIND_OPCODE_FINISH;
> > +
> > + EmitIntValue(Entry, 4, 0);
> > +}
> > +
> > +void ARMELFStreamer::EmitPersonality(const MCSymbol *Per) {
> > + Personality = Per;
> > +}
> > +
> > +void ARMELFStreamer::EmitSetFP(unsigned NewFpReg,
> > + unsigned NewSpReg,
> > + int64_t Offset) {
> > + // TODO: Not implemented
> > +}
> > +
> > +void ARMELFStreamer::EmitPad(int64_t Offset) {
> > + // TODO: Not implemented
> > +}
> > +
> > +void ARMELFStreamer::EmitRegSave(const SmallVectorImpl<unsigned>
> &RegList,
> > + bool IsVector) {
> > + // TODO: Not implemented
> > +}
> > +
> > namespace llvm {
> > MCELFStreamer* createARMELFStreamer(MCContext &Context, MCAsmBackend
> &TAB,
> > raw_ostream &OS, MCCodeEmitter
> *Emitter,
> >
> >
> > _______________________________________________
> > llvm-commits mailing list
> > llvm-commits at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
>
>
>
> --
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>
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