[llvm] r329392 - DWARFVerifier: validate information in name index entries
Pavel Labath via llvm-commits
llvm-commits at lists.llvm.org
Fri Apr 6 06:47:52 PDT 2018
That was deliberate. Both functions will run over the same set of indexes,
so there's no point in warning twice.
On Fri, 6 Apr 2018 at 14:45, Jonas Devlieghere <jdevlieghere at apple.com>
wrote:
> Did you forget to add the same warning in
> DWARFVerifier::verifyNameIndexEntries or was that on purpose?
>
> > On Apr 6, 2018, at 2:34 PM, Pavel Labath via llvm-commits <
> llvm-commits at lists.llvm.org> wrote:
> >
> > Author: labath
> > Date: Fri Apr 6 06:34:12 2018
> > New Revision: 329392
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=329392&view=rev
> > Log:
> > DWARFVerifier: validate information in name index entries
> >
> > Summary:
> > This patch add checks to verify that the information in the name index
> > entries is consistent with the debug_info section. Specifically, we
> > check that entries point to valid DIEs, and their names, tags, and
> > compile units match the information in the debug_info sections.
> >
> > These checks are only run if the previous checks did not find any errors
> > in the name index headers. Attempting to proceed with the checks anyway
> > would likely produce a lot of spurious errors and the verification code
> > would need to be very careful to avoid crashing.
> >
> > I also add a couple of more checks to the abbreviation-validation code
> > to verify that some attributes are always present (an index without a
> > DW_IDX_die_offset attribute is fairly useless).
> >
> > The entry verification works only on indexes without any type units - I
> > haven't attempted to extend it to type units, as we don't even have a
> > DWARF v5-compatible type unit generator at the moment.
> >
> > Reviewers: JDevlieghere, aprantl, dblaikie
> >
> > Subscribers: llvm-commits
> >
> > Differential Revision: https://reviews.llvm.org/D45323
> >
> > Added:
> > llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-entries.s
> > Modified:
> > llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h
> > llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h
> > llvm/trunk/lib/DebugInfo/DWARF/DWARFAcceleratorTable.cpp
> > llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp
> >
> llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-abbrev-forms.s
> >
> > Modified: llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h?rev=329392&r1=329391&r2=329392&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h
> (original)
> > +++ llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h Fri
> Apr 6 06:34:12 2018
> > @@ -283,6 +283,11 @@ public:
> >
> > Entry(const NameIndex &NameIdx, const Abbrev &Abbr);
> >
> > + public:
> > + Optional<uint64_t> getCUOffset() const override;
> > + Optional<uint64_t> getDIESectionOffset() const override;
> > + Optional<dwarf::Tag> getTag() const override { return tag(); }
> > +
> > /// Returns the Index into the Compilation Unit list of the owning
> Name
> > /// Index or None if this Accelerator Entry does not have an
> associated
> > /// Compilation Unit. It is up to the user to verify that the
> returned Index
> > @@ -293,11 +298,6 @@ public:
> > /// DW_IDX_compile_unit attribute.
> > Optional<uint64_t> getCUIndex() const;
> >
> > - public:
> > - Optional<uint64_t> getCUOffset() const override;
> > - Optional<uint64_t> getDIESectionOffset() const override;
> > - Optional<dwarf::Tag> getTag() const override { return tag(); }
> > -
> > /// .debug_names-specific getter, which always succeeds (DWARF v5
> index
> > /// entries always have a tag).
> > dwarf::Tag tag() const { return Abbr->Tag; }
> > @@ -319,7 +319,6 @@ public:
> > friend class ValueIterator;
> > };
> >
> > -private:
> > /// Error returned by NameIndex::getEntry to report it has reached the
> end of
> > /// the entry list.
> > class SentinelError : public ErrorInfo<SentinelError> {
> > @@ -330,6 +329,7 @@ private:
> > std::error_code convertToErrorCode() const override;
> > };
> >
> > +private:
> > /// DenseMapInfo for struct Abbrev.
> > struct AbbrevMapInfo {
> > static Abbrev getEmptyKey();
> > @@ -373,8 +373,6 @@ public:
> > uint32_t EntryOffsetsBase;
> > uint32_t EntriesBase;
> >
> > - Expected<Entry> getEntry(uint32_t *Offset) const;
> > -
> > void dumpCUs(ScopedPrinter &W) const;
> > void dumpLocalTUs(ScopedPrinter &W) const;
> > void dumpForeignTUs(ScopedPrinter &W) const;
> > @@ -429,6 +427,8 @@ public:
> > return Abbrevs;
> > }
> >
> > + Expected<Entry> getEntry(uint32_t *Offset) const;
> > +
> > llvm::Error extract();
> > uint32_t getUnitOffset() const { return Base; }
> > uint32_t getNextUnitOffset() const { return Base + 4 +
> Hdr.UnitLength; }
> >
> > Modified: llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h?rev=329392&r1=329391&r2=329392&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h (original)
> > +++ llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFVerifier.h Fri Apr 6
> 06:34:12 2018
> > @@ -240,6 +240,8 @@ private:
> > unsigned verifyNameIndexAttribute(const DWARFDebugNames::NameIndex &NI,
> > const DWARFDebugNames::Abbrev &Abbr,
> > DWARFDebugNames::AttributeEncoding
> AttrEnc);
> > + unsigned verifyNameIndexEntries(const DWARFDebugNames::NameIndex &NI,
> > + uint32_t Name, const DataExtractor
> &StrData);
> >
> > /// Verify that the DWARF v5 accelerator table is valid.
> > ///
> > @@ -251,6 +253,8 @@ private:
> > /// - The buckets have a valid index, or they are empty.
> > /// - All names are reachable via the hash table (they have the
> correct hash,
> > /// and the hash is in the correct bucket).
> > + /// - Information in the index entries is consistent with the
> debug_info
> > + /// section DIEs.
> > ///
> > /// \param AccelSection section containing the acceleration table
> > /// \param StrData string section
> >
> > Modified: llvm/trunk/lib/DebugInfo/DWARF/DWARFAcceleratorTable.cpp
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/DebugInfo/DWARF/DWARFAcceleratorTable.cpp?rev=329392&r1=329391&r2=329392&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/lib/DebugInfo/DWARF/DWARFAcceleratorTable.cpp (original)
> > +++ llvm/trunk/lib/DebugInfo/DWARF/DWARFAcceleratorTable.cpp Fri Apr 6
> 06:34:12 2018
> > @@ -601,7 +601,7 @@ Expected<DWARFDebugNames::Entry>
> > DWARFDebugNames::NameIndex::getEntry(uint32_t *Offset) const {
> > const DWARFDataExtractor &AS = Section.AccelSection;
> > if (!AS.isValidOffset(*Offset))
> > - return make_error<StringError>("Incorrectly terminated entry list",
> > + return make_error<StringError>("Incorrectly terminated entry list.",
> > inconvertibleErrorCode());
> >
> > uint32_t AbbrevCode = AS.getULEB128(Offset);
> > @@ -610,7 +610,7 @@ DWARFDebugNames::NameIndex::getEntry(uin
> >
> > const auto AbbrevIt = Abbrevs.find_as(AbbrevCode);
> > if (AbbrevIt == Abbrevs.end())
> > - return make_error<StringError>("Invalid abbreviation",
> > + return make_error<StringError>("Invalid abbreviation.",
> > inconvertibleErrorCode());
> >
> > Entry E(*this, *AbbrevIt);
> > @@ -618,7 +618,7 @@ DWARFDebugNames::NameIndex::getEntry(uin
> > dwarf::FormParams FormParams = {Hdr.Version, 0,
> dwarf::DwarfFormat::DWARF32};
> > for (auto &Value : E.Values) {
> > if (!Value.extractValue(AS, Offset, FormParams))
> > - return make_error<StringError>("Error extracting index attribute
> values",
> > + return make_error<StringError>("Error extracting index attribute
> values.",
> > inconvertibleErrorCode());
> > }
> > return std::move(E);
> >
> > Modified: llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp?rev=329392&r1=329391&r2=329392&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp (original)
> > +++ llvm/trunk/lib/DebugInfo/DWARF/DWARFVerifier.cpp Fri Apr 6 06:34:12
> 2018
> > @@ -1000,6 +1000,13 @@ unsigned DWARFVerifier::verifyNameIndexA
> >
> > unsigned
> > DWARFVerifier::verifyNameIndexAbbrevs(const DWARFDebugNames::NameIndex
> &NI) {
> > + if (NI.getLocalTUCount() + NI.getForeignTUCount() > 0) {
> > + warn() << formatv("Name Index @ {0:x}: Verifying indexes of type
> units is "
> > + "not currently supported.\n",
> > + NI.getUnitOffset());
> > + return 0;
> > + }
> > +
> > unsigned NumErrors = 0;
> > for (const auto &Abbrev : NI.getAbbrevs()) {
> > StringRef TagName = dwarf::TagString(Abbrev.Tag);
> > @@ -1019,7 +1026,119 @@ DWARFVerifier::verifyNameIndexAbbrevs(co
> > }
> > NumErrors += verifyNameIndexAttribute(NI, Abbrev, AttrEnc);
> > }
> > +
> > + if (NI.getCUCount() > 1 &&
> !Attributes.count(dwarf::DW_IDX_compile_unit)) {
> > + error() << formatv("NameIndex @ {0:x}: Indexing multiple compile
> units "
> > + "and abbreviation {1:x} has no {2}
> attribute.\n",
> > + NI.getUnitOffset(), Abbrev.Code,
> > + dwarf::DW_IDX_compile_unit);
> > + ++NumErrors;
> > + }
> > + if (!Attributes.count(dwarf::DW_IDX_die_offset)) {
> > + error() << formatv(
> > + "NameIndex @ {0:x}: Abbreviation {1:x} has no {2}
> attribute.\n",
> > + NI.getUnitOffset(), Abbrev.Code, dwarf::DW_IDX_die_offset);
> > + ++NumErrors;
> > + }
> > + }
> > + return NumErrors;
> > +}
> > +
> > +static SmallVector<StringRef, 2> getNames(const DWARFDie &DIE) {
> > + SmallVector<StringRef, 2> Result;
> > + if (const char *Str = DIE.getName(DINameKind::ShortName))
> > + Result.emplace_back(Str);
> > + else if (DIE.getTag() == dwarf::DW_TAG_namespace)
> > + Result.emplace_back("(anonymous namespace)");
> > +
> > + if (const char *Str = DIE.getName(DINameKind::LinkageName)) {
> > + if (Result.empty() || Result[0] != Str)
> > + Result.emplace_back(Str);
> > + }
> > +
> > + return Result;
> > +}
> > +
> > +unsigned
> > +DWARFVerifier::verifyNameIndexEntries(const DWARFDebugNames::NameIndex
> &NI,
> > + uint32_t Name,
> > + const DataExtractor &StrData) {
> > + // Verifying type unit indexes not supported.
> > + if (NI.getLocalTUCount() + NI.getForeignTUCount() > 0)
> > + return 0;
> > +
> > + DWARFDebugNames::NameTableEntry NTE = NI.getNameTableEntry(Name);
> > + const char *CStr = StrData.getCStr(&NTE.StringOffset);
> > + if (!CStr) {
> > + error() << formatv(
> > + "Name Index @ {0:x}: Unable to get string associated with name
> {1}.\n",
> > + NI.getUnitOffset(), Name);
> > + return 1;
> > + }
> > + StringRef Str(CStr);
> > +
> > + unsigned NumErrors = 0;
> > + unsigned NumEntries = 0;
> > + uint32_t EntryID = NTE.EntryOffset;
> > + Expected<DWARFDebugNames::Entry> EntryOr =
> NI.getEntry(&NTE.EntryOffset);
> > + for (; EntryOr; ++NumEntries, EntryID = NTE.EntryOffset,
> > + EntryOr =
> NI.getEntry(&NTE.EntryOffset)) {
> > + uint32_t CUIndex = *EntryOr->getCUIndex();
> > + if (CUIndex > NI.getCUCount()) {
> > + error() << formatv("Name Index @ {0:x}: Entry @ {1:x} contains an
> "
> > + "invalid CU index ({2}).\n",
> > + NI.getUnitOffset(), EntryID, CUIndex);
> > + ++NumErrors;
> > + continue;
> > + }
> > + uint32_t CUOffset = NI.getCUOffset(CUIndex);
> > + uint64_t DIEOffset = *EntryOr->getDIESectionOffset();
> > + DWARFDie DIE = DCtx.getDIEForOffset(DIEOffset);
> > + if (!DIE) {
> > + error() << formatv("Name Index @ {0:x}: Entry @ {1:x} references
> a "
> > + "non-existing DIE @ {2:x}.\n",
> > + NI.getUnitOffset(), EntryID, DIEOffset);
> > + ++NumErrors;
> > + continue;
> > + }
> > + if (DIE.getDwarfUnit()->getOffset() != CUOffset) {
> > + error() << formatv("Name Index @ {0:x}: Entry @ {1:x}: mismatched
> CU of "
> > + "DIE @ {2:x}: index - {3:x}; debug_info -
> {4:x}.\n",
> > + NI.getUnitOffset(), EntryID, DIEOffset,
> CUOffset,
> > + DIE.getDwarfUnit()->getOffset());
> > + ++NumErrors;
> > + }
> > + if (DIE.getTag() != EntryOr->tag()) {
> > + error() << formatv("Name Index @ {0:x}: Entry @ {1:x}: mismatched
> Tag of "
> > + "DIE @ {2:x}: index - {3}; debug_info -
> {4}.\n",
> > + NI.getUnitOffset(), EntryID, DIEOffset,
> EntryOr->tag(),
> > + DIE.getTag());
> > + ++NumErrors;
> > + }
> > +
> > + auto EntryNames = getNames(DIE);
> > + if (!is_contained(EntryNames, Str)) {
> > + error() << formatv("Name Index @ {0:x}: Entry @ {1:x}: mismatched
> Name "
> > + "of DIE @ {2:x}: index - {3}; debug_info -
> {4}.\n",
> > + NI.getUnitOffset(), EntryID, DIEOffset, Str,
> > + make_range(EntryNames.begin(),
> EntryNames.end()));
> > + }
> > }
> > + handleAllErrors(EntryOr.takeError(),
> > + [&](const DWARFDebugNames::SentinelError &) {
> > + if (NumEntries > 0)
> > + return;
> > + error() << formatv("Name Index @ {0:x}: Name {1}
> ({2}) is "
> > + "not associated with any
> entries.\n",
> > + NI.getUnitOffset(), Name, Str);
> > + ++NumErrors;
> > + },
> > + [&](const ErrorInfoBase &Info) {
> > + error() << formatv(
> > + "Name Index @ {0:x}: Name {1} ({2}): {3}\n",
> > + NI.getUnitOffset(), Name, Str, Info.message());
> > + ++NumErrors;
> > + });
> > return NumErrors;
> > }
> >
> > @@ -1045,6 +1164,13 @@ unsigned DWARFVerifier::verifyDebugNames
> > for (const auto &NI : AccelTable)
> > NumErrors += verifyNameIndexAbbrevs(NI);
> >
> > + // Don't attempt Entry validation if any of the previous checks found
> errors
> > + if (NumErrors > 0)
> > + return NumErrors;
> > + for (const auto &NI : AccelTable)
> > + for (uint64_t Name = 1; Name <= NI.getNameCount(); ++Name)
> > + NumErrors += verifyNameIndexEntries(NI, Name, StrData);
> > +
> > return NumErrors;
> > }
> >
> >
> > Modified:
> llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-abbrev-forms.s
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-abbrev-forms.s?rev=329392&r1=329391&r2=329392&view=diff
> >
> ==============================================================================
> > ---
> llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-abbrev-forms.s
> (original)
> > +++
> llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-abbrev-forms.s
> Fri Apr 6 06:34:12 2018
> > @@ -8,6 +8,8 @@
> > # CHECK: error: NameIndex @ 0x0: Abbreviation 0x4 contains multiple
> DW_IDX_die_offset attributes.
> > # CHECK: NameIndex @ 0x0: Abbreviation 0x1: DW_IDX_die_offset uses an
> unknown form: DW_FORM_unknown_1fff.
> > # CHECK: warning: NameIndex @ 0x0: Abbreviation 0x3 references an
> unknown tag: DW_TAG_unknown_8080.
> > +# CHECK: error: NameIndex @ 0x0: Abbreviation 0x5 has no
> DW_IDX_die_offset attribute.
> > +# CHECK: error: NameIndex @ 0x55: Indexing multiple compile units and
> abbreviation 0x1 has no DW_IDX_compile_unit attribute.
> >
> > .section .debug_str,"MS", at progbits,1
> > .Lstring_producer:
> > @@ -39,6 +41,30 @@
> > .byte 0 # End Of Children Mark
> > .Lcu_end0:
> >
> > +.Lcu_begin1:
> > + .long .Lcu_end1-.Lcu_start1 # Length of Unit
> > +.Lcu_start1:
> > + .short 4 # DWARF version number
> > + .long .Lsection_abbrev # Offset Into Abbrev. Section
> > + .byte 8 # Address Size (in bytes)
> > + .byte 1 # Abbrev [1] DW_TAG_compile_unit
> > + .long .Lstring_producer # DW_AT_producer
> > + .short 12 # DW_AT_language
> > + .byte 0 # End Of Children Mark
> > +.Lcu_end1:
> > +
> > +.Lcu_begin2:
> > + .long .Lcu_end2-.Lcu_start2 # Length of Unit
> > +.Lcu_start2:
> > + .short 4 # DWARF version number
> > + .long .Lsection_abbrev # Offset Into Abbrev. Section
> > + .byte 8 # Address Size (in bytes)
> > + .byte 1 # Abbrev [1] DW_TAG_compile_unit
> > + .long .Lstring_producer # DW_AT_producer
> > + .short 12 # DW_AT_language
> > + .byte 0 # End Of Children Mark
> > +.Lcu_end2:
> > +
> > .section .debug_names,"", at progbits
> > .long .Lnames_end0-.Lnames_start0 # Header: contribution length
> > .Lnames_start0:
> > @@ -87,6 +113,36 @@
> > .byte 17 # DW_FORM_ref1
> > .byte 0 # End of abbrev
> > .byte 0 # End of abbrev
> > + .byte 5 # Abbrev code
> > + .byte 46 # DW_TAG_subprogram
> > + .byte 4 # DW_IDX_parent
> > + .byte 5 # DW_FORM_data2
> > + .byte 0 # End of abbrev
> > + .byte 0 # End of abbrev
> > .byte 0 # End of abbrev list
> > .Lnames_abbrev_end0:
> > .Lnames_end0:
> > +
> > + .long .Lnames_end1-.Lnames_start1 # Header: contribution length
> > +.Lnames_start1:
> > + .short 5 # Header: version
> > + .short 0 # Header: padding
> > + .long 2 # Header: compilation unit count
> > + .long 0 # Header: local type unit count
> > + .long 0 # Header: foreign type unit count
> > + .long 0 # Header: bucket count
> > + .long 0 # Header: name count
> > + .long .Lnames_abbrev_end1-.Lnames_abbrev_start1 # Header:
> abbreviation table size
> > + .long 0 # Header: augmentation length
> > + .long .Lcu_begin1 # Compilation unit 0
> > + .long .Lcu_begin2 # Compilation unit 1
> > +.Lnames_abbrev_start1:
> > + .byte 1 # Abbrev code
> > + .byte 46 # DW_TAG_subprogram
> > + .byte 3 # DW_IDX_die_offset
> > + .byte 17 # DW_FORM_ref1
> > + .byte 0 # End of abbrev
> > + .byte 0 # End of abbrev
> > + .byte 0 # End of abbrev list
> > +.Lnames_abbrev_end1:
> > +.Lnames_end1:
> >
> > Added:
> llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-entries.s
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-entries.s?rev=329392&view=auto
> >
> ==============================================================================
> > ---
> llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-entries.s
> (added)
> > +++
> llvm/trunk/test/tools/llvm-dwarfdump/X86/debug-names-verify-entries.s Fri
> Apr 6 06:34:12 2018
> > @@ -0,0 +1,188 @@
> > +# RUN: llvm-mc -triple x86_64-pc-linux %s -filetype=obj -o - | not
> llvm-dwarfdump -verify - | FileCheck %s
> > +
> > +# CHECK: error: Name Index @ 0x0: Unable to get string associated with
> name 1.
> > +# CHECK: error: Name Index @ 0x0: Entry @ 0x73 contains an invalid CU
> index (47).
> > +# CHECK: error: Name Index @ 0x0: Entry @ 0x79 references a
> non-existing DIE @ 0x3fa.
> > +# CHECK: error: Name Index @ 0x0: Entry @ 0x85: mismatched CU of DIE @
> 0x30: index - 0x0; debug_info - 0x1e.
> > +# CHECK: error: Name Index @ 0x0: Entry @ 0x8b: mismatched Tag of DIE @
> 0x17: index - DW_TAG_subprogram; debug_info - DW_TAG_variable.
> > +# CHECK: error: Name Index @ 0x0: Entry @ 0x91: mismatched Name of DIE
> @ 0x35: index - foo; debug_info - bar, _Z3bar.
> > +# CHECK: error: Name Index @ 0x0: Name 2 (foo): Incorrectly terminated
> entry list.
> > +# CHECK: error: Name Index @ 0x0: Name 3 (bar) is not associated with
> any entries.
> > +# CHECK: error: Name Index @ 0x0: Entry @ 0x69: mismatched Name of DIE
> @ 0x1c: index - (pseudonymous namespace); debug_info - (anonymous
> namespace).
> > +
> > + .section .debug_str,"MS", at progbits,1
> > +.Lstring_foo:
> > + .asciz "foo"
> > +.Lstring_bar:
> > + .asciz "bar"
> > +.Lstring_bar_mangled:
> > + .asciz "_Z3bar"
> > +.Lstring_pseudo_namespace:
> > + .asciz "(pseudonymous namespace)"
> > +.Lstring_producer:
> > + .asciz "Hand-written dwarf"
> > +
> > + .section .debug_abbrev,"", at progbits
> > +.Lsection_abbrev:
> > + .byte 1 # Abbreviation Code
> > + .byte 17 # DW_TAG_compile_unit
> > + .byte 1 # DW_CHILDREN_yes
> > + .byte 37 # DW_AT_producer
> > + .byte 14 # DW_FORM_strp
> > + .byte 19 # DW_AT_language
> > + .byte 5 # DW_FORM_data2
> > + .byte 0 # EOM(1)
> > + .byte 0 # EOM(2)
> > + .byte 2 # Abbreviation Code
> > + .byte 46 # DW_TAG_subprogram
> > + .byte 0 # DW_CHILDREN_no
> > + .byte 3 # DW_AT_name
> > + .byte 14 # DW_FORM_strp
> > + .byte 63 # DW_AT_external
> > + .byte 25 # DW_FORM_flag_present
> > + .byte 0 # EOM(1)
> > + .byte 0 # EOM(2)
> > + .byte 3 # Abbreviation Code
> > + .byte 52 # DW_TAG_variable
> > + .byte 0 # DW_CHILDREN_no
> > + .byte 3 # DW_AT_name
> > + .byte 14 # DW_FORM_strp
> > + .byte 0 # EOM(1)
> > + .byte 0 # EOM(2)
> > + .byte 4 # Abbreviation Code
> > + .byte 57 # DW_TAG_namespace
> > + .byte 0 # DW_CHILDREN_no
> > + .byte 0 # EOM(1)
> > + .byte 0 # EOM(2)
> > + .byte 5 # Abbreviation Code
> > + .byte 52 # DW_TAG_variable
> > + .byte 0 # DW_CHILDREN_no
> > + .byte 3 # DW_AT_name
> > + .byte 14 # DW_FORM_strp
> > + .byte 110 # DW_AT_linkage_name
> > + .byte 14 # DW_FORM_strp
> > + .byte 0 # EOM(1)
> > + .byte 0 # EOM(2)
> > + .byte 0 # EOM(3)
> > +
> > + .section .debug_info,"", at progbits
> > +.Lcu_begin0:
> > + .long .Lcu_end0-.Lcu_start0 # Length of Unit
> > +.Lcu_start0:
> > + .short 4 # DWARF version number
> > + .long .Lsection_abbrev # Offset Into Abbrev. Section
> > + .byte 8 # Address Size (in bytes)
> > + .byte 1 # Abbrev [1] DW_TAG_compile_unit
> > + .long .Lstring_producer # DW_AT_producer
> > + .short 12 # DW_AT_language
> > +.Ldie_foo:
> > + .byte 2 # Abbrev [2] DW_TAG_subprogram
> > + .long .Lstring_foo # DW_AT_name
> > + # DW_AT_external
> > +.Ldie_foo_var:
> > + .byte 3 # Abbrev [3] DW_TAG_variable
> > + .long .Lstring_foo # DW_AT_name
> > +.Ldie_namespace:
> > + .byte 4 # Abbrev [3] DW_TAG_namespace
> > + .byte 0 # End Of Children Mark
> > +.Lcu_end0:
> > +
> > +.Lcu_begin1:
> > + .long .Lcu_end1-.Lcu_start1 # Length of Unit
> > +.Lcu_start1:
> > + .short 4 # DWARF version number
> > + .long .Lsection_abbrev # Offset Into Abbrev. Section
> > + .byte 8 # Address Size (in bytes)
> > + .byte 1 # Abbrev [1] DW_TAG_compile_unit
> > + .long .Lstring_producer # DW_AT_producer
> > + .short 12 # DW_AT_language
> > +.Ldie_foo2:
> > + .byte 2 # Abbrev [2] DW_TAG_subprogram
> > + .long .Lstring_foo # DW_AT_name
> > + # DW_AT_external
> > +.Ldie_bar_linkage:
> > + .byte 5 # Abbrev [2] DW_TAG_variable
> > + .long .Lstring_bar # DW_AT_name
> > + .long .Lstring_bar_mangled # DW_AT_linkage_name
> > + .byte 0 # End Of Children Mark
> > +.Lcu_end1:
> > +
> > +
> > + .section .debug_names,"", at progbits
> > + .long .Lnames_end0-.Lnames_start0 # Header: contribution length
> > +.Lnames_start0:
> > + .short 5 # Header: version
> > + .short 0 # Header: padding
> > + .long 2 # Header: compilation unit count
> > + .long 0 # Header: local type unit count
> > + .long 0 # Header: foreign type unit count
> > + .long 0 # Header: bucket count
> > + .long 4 # Header: name count
> > + .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header:
> abbreviation table size
> > + .long 0 # Header: augmentation length
> > + .long .Lcu_begin0 # Compilation unit 0
> > + .long .Lcu_begin1 # Compilation unit 1
> > + .long .Lstring_foo+1000 # String 1: <broken>
> > + .long .Lstring_foo # String 2: foo
> > + .long .Lstring_bar # String 3: bar
> > + .long .Lstring_pseudo_namespace # String 4: (pseudonymous
> namespace)
> > + .long .Lnames0-.Lnames_entries0 # Offset 1
> > + .long .Lnames0-.Lnames_entries0 # Offset 2
> > + .long .Lnames1-.Lnames_entries0 # Offset 3
> > + .long .Lnames2-.Lnames_entries0 # Offset 4
> > +.Lnames_abbrev_start0:
> > + .byte 46 # Abbrev code
> > + .byte 46 # DW_TAG_subprogram
> > + .byte 1 # DW_IDX_compile_unit
> > + .byte 11 # DW_FORM_data1
> > + .byte 3 # DW_IDX_die_offset
> > + .byte 19 # DW_FORM_ref4
> > + .byte 0 # End of abbrev
> > + .byte 0 # End of abbrev
> > + .byte 57 # Abbrev code
> > + .byte 57 # DW_TAG_namespace
> > + .byte 1 # DW_IDX_compile_unit
> > + .byte 11 # DW_FORM_data1
> > + .byte 3 # DW_IDX_die_offset
> > + .byte 19 # DW_FORM_ref4
> > + .byte 0 # End of abbrev
> > + .byte 0 # End of abbrev
> > + .byte 52 # Abbrev code
> > + .byte 52 # DW_TAG_variable
> > + .byte 1 # DW_IDX_compile_unit
> > + .byte 11 # DW_FORM_data1
> > + .byte 3 # DW_IDX_die_offset
> > + .byte 19 # DW_FORM_ref4
> > + .byte 0 # End of abbrev
> > + .byte 0 # End of abbrev
> > + .byte 0 # End of abbrev list
> > +.Lnames_abbrev_end0:
> > +.Lnames_entries0:
> > +.Lnames1:
> > + .long 0 # End of list: bar
> > +.Lnames2:
> > + .byte 57 # Abbrev code
> > + .byte 0 # DW_IDX_compile_unit
> > + .long .Ldie_namespace-.Lcu_begin0 # DW_IDX_die_offset
> > + .long 0 # End of list: (pseudonymous
> namespace)
> > +.Lnames0:
> > + .byte 46 # Abbrev code
> > + .byte 47 # DW_IDX_compile_unit
> > + .long .Ldie_foo-.Lcu_begin0 # DW_IDX_die_offset
> > + .byte 46 # Abbrev code
> > + .byte 0 # DW_IDX_compile_unit
> > + .long .Ldie_foo-.Lcu_begin0+1000 # DW_IDX_die_offset
> > + .byte 46 # Abbrev code
> > + .byte 0 # DW_IDX_compile_unit
> > + .long .Ldie_foo-.Lcu_begin0 # DW_IDX_die_offset
> > + .byte 46 # Abbrev code
> > + .byte 0 # DW_IDX_compile_unit
> > + .long .Ldie_foo2-.Lcu_begin0 # DW_IDX_die_offset
> > + .byte 46 # Abbrev code
> > + .byte 0 # DW_IDX_compile_unit
> > + .long .Ldie_foo_var-.Lcu_begin0 # DW_IDX_die_offset
> > + .byte 52 # Abbrev code
> > + .byte 1 # DW_IDX_compile_unit
> > + .long .Ldie_bar_linkage-.Lcu_begin1 # DW_IDX_die_offset
> > + #.long 0 # End of list deliberately missing
> > +.Lnames_end0:
> >
> >
> > _______________________________________________
> > llvm-commits mailing list
> > llvm-commits at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20180406/9366c41b/attachment-0001.html>
More information about the llvm-commits
mailing list