+
+template <typename A>
+class CompactUnwindAtom : public ld::Atom {
+public:
+ CompactUnwindAtom(ld::Internal& state,const ld::Atom* funcAtom,
+ uint32_t startOffset, uint32_t len, uint32_t cui);
+ ~CompactUnwindAtom() {}
+
+ virtual const ld::File* file() const { return NULL; }
+ virtual const char* name() const { return "compact unwind info"; }
+ virtual uint64_t size() const { return sizeof(macho_compact_unwind_entry<P>); }
+ virtual uint64_t objectAddress() const { return 0; }
+ virtual void copyRawContent(uint8_t buffer[]) const;
+ virtual void setScope(Scope) { }
+ virtual ld::Fixup::iterator fixupsBegin() const { return (ld::Fixup*)&_fixups[0]; }
+ virtual ld::Fixup::iterator fixupsEnd() const { return (ld::Fixup*)&_fixups[_fixups.size()]; }
+
+private:
+ typedef typename A::P P;
+ typedef typename A::P::E E;
+ typedef typename A::P::uint_t pint_t;
+
+
+ const ld::Atom* _atom;
+ const uint32_t _startOffset;
+ const uint32_t _len;
+ const uint32_t _compactUnwindInfo;
+ std::vector<ld::Fixup> _fixups;
+
+ static ld::Fixup::Kind _s_pointerKind;
+ static ld::Fixup::Kind _s_pointerStoreKind;
+ static ld::Section _s_section;
+};
+
+
+template <typename A>
+ld::Section CompactUnwindAtom<A>::_s_section("__LD", "__compact_unwind", ld::Section::typeDebug);
+
+template <> ld::Fixup::Kind CompactUnwindAtom<x86>::_s_pointerKind = ld::Fixup::kindStoreLittleEndian32;
+template <> ld::Fixup::Kind CompactUnwindAtom<x86>::_s_pointerStoreKind = ld::Fixup::kindStoreTargetAddressLittleEndian32;
+template <> ld::Fixup::Kind CompactUnwindAtom<x86_64>::_s_pointerKind = ld::Fixup::kindStoreLittleEndian64;
+template <> ld::Fixup::Kind CompactUnwindAtom<x86_64>::_s_pointerStoreKind = ld::Fixup::kindStoreTargetAddressLittleEndian64;
+#if SUPPORT_ARCH_arm64
+template <> ld::Fixup::Kind CompactUnwindAtom<arm64>::_s_pointerKind = ld::Fixup::kindStoreLittleEndian64;
+template <> ld::Fixup::Kind CompactUnwindAtom<arm64>::_s_pointerStoreKind = ld::Fixup::kindStoreTargetAddressLittleEndian64;
+#endif
+template <> ld::Fixup::Kind CompactUnwindAtom<arm>::_s_pointerKind = ld::Fixup::kindStoreLittleEndian32;
+template <> ld::Fixup::Kind CompactUnwindAtom<arm>::_s_pointerStoreKind = ld::Fixup::kindStoreTargetAddressLittleEndian32;
+
+template <typename A>
+CompactUnwindAtom<A>::CompactUnwindAtom(ld::Internal& state,const ld::Atom* funcAtom, uint32_t startOffset,
+ uint32_t len, uint32_t cui)
+ : ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
+ ld::Atom::scopeTranslationUnit, ld::Atom::typeUnclassified,
+ symbolTableNotIn, false, false, false, ld::Atom::Alignment(log2(sizeof(pint_t)))),
+ _atom(funcAtom), _startOffset(startOffset), _len(len), _compactUnwindInfo(cui)
+{
+ _fixups.push_back(ld::Fixup(macho_compact_unwind_entry<P>::codeStartFieldOffset(), ld::Fixup::k1of3, ld::Fixup::kindSetTargetAddress, funcAtom));
+ _fixups.push_back(ld::Fixup(macho_compact_unwind_entry<P>::codeStartFieldOffset(), ld::Fixup::k2of3, ld::Fixup::kindAddAddend, _startOffset));
+ _fixups.push_back(ld::Fixup(macho_compact_unwind_entry<P>::codeStartFieldOffset(), ld::Fixup::k3of3, _s_pointerKind));
+ // see if atom has subordinate personality function or lsda
+ for (ld::Fixup::iterator fit = funcAtom->fixupsBegin(), end=funcAtom->fixupsEnd(); fit != end; ++fit) {
+ switch ( fit->kind ) {
+ case ld::Fixup::kindNoneGroupSubordinatePersonality:
+ assert(fit->binding == ld::Fixup::bindingsIndirectlyBound);
+ _fixups.push_back(ld::Fixup(macho_compact_unwind_entry<P>::personalityFieldOffset(), ld::Fixup::k1of1, _s_pointerStoreKind, state.indirectBindingTable[fit->u.bindingIndex]));
+ break;
+ case ld::Fixup::kindNoneGroupSubordinateLSDA:
+ assert(fit->binding == ld::Fixup::bindingDirectlyBound);
+ _fixups.push_back(ld::Fixup(macho_compact_unwind_entry<P>::lsdaFieldOffset(), ld::Fixup::k1of1, _s_pointerStoreKind, fit->u.target));
+ break;
+ default:
+ break;
+ }
+ }
+
+}
+
+template <typename A>
+void CompactUnwindAtom<A>::copyRawContent(uint8_t buffer[]) const
+{
+ macho_compact_unwind_entry<P>* buf = (macho_compact_unwind_entry<P>*)buffer;
+ buf->set_codeStart(0);
+ buf->set_codeLen(_len);
+ buf->set_compactUnwindInfo(_compactUnwindInfo);
+ buf->set_personality(0);
+ buf->set_lsda(0);
+}
+
+
+static void makeCompactUnwindAtom(const Options& opts, ld::Internal& state, const ld::Atom* atom,
+ uint32_t startOffset, uint32_t endOffset, uint32_t cui)
+{
+ switch ( opts.architecture() ) {
+#if SUPPORT_ARCH_x86_64
+ case CPU_TYPE_X86_64:
+ state.addAtom(*new CompactUnwindAtom<x86_64>(state, atom, startOffset, endOffset-startOffset, cui));
+ break;
+#endif
+#if SUPPORT_ARCH_i386
+ case CPU_TYPE_I386:
+ state.addAtom(*new CompactUnwindAtom<x86>(state, atom, startOffset, endOffset-startOffset, cui));
+ break;
+#endif
+#if SUPPORT_ARCH_arm64
+ case CPU_TYPE_ARM64:
+ state.addAtom(*new CompactUnwindAtom<arm64>(state, atom, startOffset, endOffset-startOffset, cui));
+ break;
+#endif
+ case CPU_TYPE_ARM:
+ state.addAtom(*new CompactUnwindAtom<arm>(state, atom, startOffset, endOffset-startOffset, cui));
+ break;
+ }
+}
+
+static void makeRelocateableCompactUnwindSection(const Options& opts, ld::Internal& state)
+{
+ // can't add CompactUnwindAtom atoms will iterating, so pre-scan
+ std::vector<const ld::Atom*> atomsWithUnwind;
+ for (std::vector<ld::Internal::FinalSection*>::const_iterator sit=state.sections.begin(); sit != state.sections.end(); ++sit) {
+ ld::Internal::FinalSection* sect = *sit;
+ for (std::vector<const ld::Atom*>::iterator ait=sect->atoms.begin(); ait != sect->atoms.end(); ++ait) {
+ const ld::Atom* atom = *ait;
+ if ( atom->beginUnwind() != atom->endUnwind() )
+ atomsWithUnwind.push_back(atom);
+ }
+ }
+ // make one CompactUnwindAtom for each compact unwind range in each atom
+ for (std::vector<const ld::Atom*>::iterator it = atomsWithUnwind.begin(); it != atomsWithUnwind.end(); ++it) {
+ const ld::Atom* atom = *it;
+ uint32_t lastOffset = 0;
+ uint32_t lastCUE = 0;
+ bool first = true;
+ for (ld::Atom::UnwindInfo::iterator uit=atom->beginUnwind(); uit != atom->endUnwind(); ++uit) {
+ if ( !first ) {
+ makeCompactUnwindAtom(opts, state, atom, lastOffset, uit->startOffset, lastCUE);
+ }
+ lastOffset = uit->startOffset;
+ lastCUE = uit->unwindInfo;
+ first = false;
+ }
+ makeCompactUnwindAtom(opts, state, atom, lastOffset, (uint32_t)atom->size(), lastCUE);
+ }
+}
+
+
+void doPass(const Options& opts, ld::Internal& state)
+{
+ if ( opts.outputKind() == Options::kObjectFile )
+ makeRelocateableCompactUnwindSection(opts, state);
+
+ else if ( opts.needsUnwindInfoSection() )
+ makeFinalLinkedImageCompactUnwindSection(opts, state);
+}
+
+
projects / apple / ld64.git / blobdiff