This seems to have been fixed with the http://reviews.llvm.org/D18008.
> On Mar 28, 2016, at 9:31 AM, Greg Clayton via lldb-dev
> <lldb-dev@lists.llvm.org> wrote:
>
> Is it possible for me to see the "biggrep_master_server_async" binary? I
> would like to look at the DWARF and try to figure out what is wrong. It seems
> that this code is what is causing the problem:
>
>
> CompilerType member_clang_type = member_type->GetLayoutCompilerType ();
> if (!member_clang_type.IsCompleteType())
> member_clang_type.GetCompleteType();
>
> {
> // Older versions of clang emit array[0] and array[1] in the same way
> (<rdar://problem/12566646>).
> // If the current field is at the end of the structure, then there is
> definitely no room for extra
> // elements and we override the type to array[0].
>
> CompilerType member_array_element_type;
> uint64_t member_array_size;
> bool member_array_is_incomplete;
>
> if (member_clang_type.IsArrayType(&member_array_element_type,
> &member_array_size,
> &member_array_is_incomplete) &&
> !member_array_is_incomplete)
> {
> uint64_t parent_byte_size =
> parent_die.GetAttributeValueAsUnsigned(DW_AT_byte_size, UINT64_MAX);
>
> if (member_byte_offset >= parent_byte_size)
> {
> if (member_array_size != 1 && (member_array_size != 0 ||
> member_byte_offset > parent_byte_size))
> {
> module_sp->ReportError ("0x%8.8" PRIx64 ": DW_TAG_member '%s'
> refers to type 0x%8.8" PRIx64 " which extends beyond the bounds of 0x%8.8"
> PRIx64,
> die.GetID(),
> name,
> encoding_form.Reference(),
> parent_die.GetID());
> }
>
> member_clang_type =
> m_ast.CreateArrayType(member_array_element_type, 0, false);
> }
> }
> }
>
>
> So we are parsing a member variable, and the member variable's type is an
> array type, and the offset of the member is beyond the parent's type's size
> and yet the array claims to have a valid size.
>
> This code is trying to correctly create an CompilerType for a struct such as
> this:
>
> struct MyStruct
> {
> size_t num_entries;
> Entry entries[0];
> };
>
> Older versions of clang would emit the same DWARF for:
>
> struct MyStruct
> {
> size_t num_entries;
> Entry entries[0];
> };
>
> or
>
> struct MyStruct
> {
> size_t num_entries;
> Entry entries[1];
> };
>
> This is bad because in the DWARFASTParserClang we are trying to faithfully
> re-create the type as the user initially created it.
>
> This error is trying to say that you have a structure where the byte size of
> "MyStruct" is something like 8 bytes, but "entries" is an array that has a
> valid size (not zero or one) and that the offset of "entries" is greater than
> or equal to 8. If "entries" has a size like:
>
> struct MyStruct
> {
> size_t num_entries;
> Entry entries[1];
> };
>
> You would expect the member offset for "entries" to be less than or equal to
> the sizeof(MyStruct). If "Entry" is 8 bytes in size, you might expect the
> byte size of "MyStruct" to be 16, and the offset of "num_entries" to be 0 and
> "entries" to be 8. Both offsets are less than or equal to the byte size of 16.
>
> If I can see the DWARF file I can tell you more. If I can't, you will need to
> step through this code and see why this is triggering. The error message is
> telling you all you need to know to dump the problem. So for this error
> message:
>
> error: biggrep_master_server_async 0x10b9a91a: DW_TAG_member '_M_pod_data'
> refers to type 0x10bb1e99 which extends beyond the bounds of 0x10b9a901
>
> So if you dump the DWARF and look for the DIE at 0x10b9a91a, you will be able
> to see the DWARF that is causing the problem. On MacOSX, I would do this:
>
> % dwarfdump --debug-info=0x10b9a91a --show-children --show-parents
> biggrep_master_server_async
>
> llvm-dwarfdump will dump your entire file and you will need to look through a
> ton of DWARF in the output. You will need to search for "0x10b9a91a:" (the
> offset followed by a colon).
>
> So LLDB believes it is pointing out an error in the DWARF that needs to be
> fixed in the compiler. It could be an incorrect error, but I would need to
> see the DWARF in question to know more. Debugging can happen just fine if you
> ignore this error, it is actually more of a warning, but we emit an error so
> users know to file a bug and hopefully get the compiler fixed.
>
> Greg
>
>> On Mar 26, 2016, at 5:10 PM, Jeffrey Tan via lldb-dev
>> <lldb-dev@lists.llvm.org> wrote:
>>
>> Sorry, sent to the wrong alias.
>>
>> ---------- Forwarded message ----------
>> From: Jeffrey Tan <jeffrey.fu...@gmail.com>
>> Date: Sat, Mar 26, 2016 at 3:19 PM
>> Subject: DW_TAG_member extends beyond the bounds error on Linux
>> To: llvm-...@lists.llvm.org
>>
>>
>> Hi,
>>
>> While dogfooding our lldb based IDE on Linux, I am seeing a lot of variable
>> evaluation errors related to DW_TAG_member which prevents us from release
>> the IDE. Can anyone help to confirm if they are known issues? If not, any
>> information you need to troubleshoot this issue?
>>
>> Here is one example:
>>
>> (lldb) fr v
>> error: biggrep_master_server_async 0x10b9a91a: DW_TAG_member '_M_pod_data'
>> refers to type 0x10bb1e99 which extends beyond the bounds of 0x10b9a901
>> error: biggrep_master_server_async 0x10b98edc: DW_TAG_member 'small_' refers
>> to type 0x10bb1d9f which extends beyond the bounds of 0x10b98ed3
>> error: biggrep_master_server_async 0x10baf034: DW_TAG_member '__size' refers
>> to type 0x10baf04d which extends beyond the bounds of 0x10baefae
>> (facebook::biggrep::BigGrepMasterAsync *) this = 0x00007fd14d374fd0
>> (const string &const) corpus = error: summary string parsing error: {
>> store_ = {
>> = {
>> small_ = {}
>> ml_ = (data_ =
>> "��UH\x89�H�}�H\x8bE�]ÐUH\x89�H��H\x89}�H\x8bE�H\x89��~\xb4��\x90��UH\x89�SH\x83�H\x89}�H�u�H�E�H���\x9e���H\x8b\x18H\x8bE�H���O\xb4��H\x89ƿ\b",
>> size_ = 0, capacity_ = 1441151880758558720)
>> }
>> }
>> }
>> (const string &const) needle = error: summary string parsing error: {
>> store_ = {
>> = {
>> small_ = {}
>> ml_ = (data_ = "", size_ = 0, capacity_ = 1080863910568919040)
>> }
>> }
>> }
>> (facebook::biggrep::Options &) options = 0x00007fd133cfb7b0: {
>> engine = error: summary string parsing error
>> full_lines = true
>> user = error: summary string parsing error
>> max_bytes = 5000000
>> leading_context = 0
>> trailing_context = 0
>> case_sensitive = true
>> client_hostname = error: summary string parsing error
>> client_ip = error: summary string parsing error
>> skip_logging = false
>> client_port = 0
>> shards_override = 0
>> sample = false
>> count = false
>> filename_pattern = error: summary string parsing error
>> limit = 0
>> __isset = {
>> engine = true
>> full_lines = true
>> user = true
>> max_bytes = true
>> leading_context = true
>> trailing_context = true
>> case_sensitive = true
>> client_hostname = true
>> client_ip = true
>> skip_logging = true
>> client_port = true
>> shards_override = true
>> sample = true
>> count = true
>> filename_pattern = true
>> limit = true
>> }
>> }
>> (size_t) recv_timeout = 140536468041728
>> (std::vector<std::basic_fbstring<char, std::char_traits<char>,
>> std::allocator<char>, std::fbstring_core<char> >,
>> std::allocator<std::basic_fbstring<char, std::char_traits<char>,
>> std::allocator<char>, std::fbstring_core<char> > > >) corpuses = size=0 {}
>> (std::vector<facebook::biggrep::BigGrepMasterAsync::Revision,
>> std::allocator<facebook::biggrep::BigGrepMasterAsync::Revision> >) revisions
>> = size=0 {}
>> (std::vector<facebook::biggrep::BigGrepMasterAsync::RevisionShard,
>> std::allocator<facebook::biggrep::BigGrepMasterAsync::RevisionShard> >)
>> shards = size=0 {}
>> (std::string) returnRev = error: summary string parsing error
>> (<lambda(folly::StringPiece)>) quote = {}
>> (std::basic_fbstring<char, std::char_traits<char>, std::allocator<char>,
>> std::fbstring_core<char> >) desc = {
>> store_ = {
>> = {
>> small_ = {}
>> ml_ = (data_ = "", size_ = 73415312, capacity_ = 140536494141696)
>> }
>> }
>> }
>> (folly::EventBase *) eb = 0x00007fd133cfb888
>> (apache::thrift::concurrency::ThreadManager *) tm = 0x00007fd133cfb570
>>
>> I suspect each one may be different root cause. I was able to capture one
>> callstack of a small repro:
>>
>> Breakpoint 1, DWARFASTParserClang::ParseChildMembers (this=0x8c4520, sc=...,
>> parent_die=..., class_clang_type=...,
>> class_language=lldb::eLanguageTypeUnknown,
>> base_classes=..., member_accessibilities=..., member_function_dies=...,
>> delayed_properties=...,
>> default_accessibility=@0x7ffdf3888cac: lldb::eAccessPublic,
>> is_a_class=@0x7ffdf3888cab: false, layout_info=...)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp:2937
>> 2937
>> parent_die.GetID());
>> (gdb) bt
>> #0 0x00007f103d02533d in
>> DWARFASTParserClang::ParseChildMembers(lldb_private::SymbolContext const&,
>> DWARFDIE const&, lldb_private::CompilerType&, lldb::LanguageType,
>> std::vector<clang::CXXBaseSpecifier*,
>> std::allocator<clang::CXXBaseSpecifier*> >&, std::vector<int,
>> std::allocator<int> >&, DWARFDIECollection&,
>> std::vector<DWARFASTParserClang::DelayedAddObjCClassProperty,
>> std::allocator<DWARFASTParserClang::DelayedAddObjCClassProperty> >&,
>> lldb::AccessType&, bool&, DWARFASTParserClang::LayoutInfo&) (this=0x8c4520,
>> sc=..., parent_die=..., class_clang_type=...,
>> class_language=lldb::eLanguageTypeUnknown, base_classes=...,
>> member_accessibilities=..., member_function_dies=...,
>> delayed_properties=..., default_accessibility=@0x7ffdf3888cac:
>> lldb::eAccessPublic, is_a_class=@0x7ffdf3888cab: false, layout_info=...) at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp:2937
>> #1 0x00007f103d025b84 in
>> DWARFASTParserClang::CompleteTypeFromDWARF(DWARFDIE const&,
>> lldb_private::Type*, lldb_private::CompilerType&) (this=0x8c4520, die=...,
>> type=0xc40a50, clang_type=...)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp:2036
>> #2 0x00007f103d04c5e8 in
>> SymbolFileDWARF::CompleteType(lldb_private::CompilerType&) (this=<optimized
>> out>, compiler_type=...)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp:1635
>> #3 0x00007f103ceff9da in
>> lldb_private::ClangASTContext::CompleteTagDecl(void*, clang::TagDecl*)
>> (baton=<optimized out>, decl=0xc41bc0)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/ClangASTContext.cpp:9619
>> #4 0x00007f103cf03400 in GetCompleteQualType(clang::ASTContext*,
>> clang::QualType, bool) (ast=0x7f102c020c30, qual_type=...,
>> allow_completion=allow_completion@entry=true) at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/ClangASTContext.cpp:2632
>> #5 0x00007f103cf0c99e in
>> lldb_private::ClangASTContext::GetNumChildren(void*, bool) (this=0x8c43c0,
>> type=<optimized out>, omit_empty_base_classes=<optimized out>) at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/ClangASTContext.cpp:5067
>> #6 0x00007f103ce876ad in
>> lldb_private::ValueObjectVariable::CalculateNumChildren(unsigned int)
>> (this=<optimized out>, max=4294967295)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ValueObjectVariable.cpp:102
>> #7 0x00007f103ce7759f in lldb_private::ValueObject::GetNumChildren(unsigned
>> int) (this=0xc40600, max=4294967295)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ValueObject.cpp:778
>> #8 0x00007f103cd999bd in
>> lldb_private::FormatManager::ShouldPrintAsOneLiner(lldb_private::ValueObject&)
>> (this=this@entry=0x7f103fe2f300 <GetFormatManager()::g_format_manager>,
>> valobj=...) at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/DataFormatters/FormatManager.cpp:576
>> #9 0x00007f103cd9226a in
>> lldb_private::DataVisualization::ShouldPrintAsOneLiner(lldb_private::ValueObject&)
>> (valobj=...)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/DataFormatters/DataVisualization.cpp:42
>> #10 0x00007f103cdc2167 in
>> lldb_private::ValueObjectPrinter::PrintChildrenIfNeeded(bool, bool)
>> (this=this@entry=0x7ffdf38892a0, value_printed=<optimized out>,
>> summary_printed=<optimized out>) at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/DataFormatters/ValueObjectPrinter.cpp:869
>> #11 0x00007f103cdc1572 in
>> lldb_private::ValueObjectPrinter::PrintValueObject()
>> (this=this@entry=0x7ffdf38892a0)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/DataFormatters/ValueObjectPrinter.cpp:111
>> #12 0x00007f103ce7102f in
>> lldb_private::ValueObject::Dump(lldb_private::Stream&,
>> lldb_private::DumpValueObjectOptions const&) (this=this@entry=0xc40600,
>> s=..., options=...) at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ValueObject.cpp:3585
>> #13 0x00007f103d27e5e4 in
>> CommandObjectFrameVariable::DoExecute(lldb_private::Args&,
>> lldb_private::CommandReturnObject&) (this=0x7d0590, command=..., result=...)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Commands/CommandObjectFrame.cpp:591
>> #14 0x00007f103cece45d in lldb_private::CommandObjectParsed::Execute(char
>> const*, lldb_private::CommandReturnObject&) (this=0x7d0590,
>> args_string=<optimized out>, result=...) at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Interpreter/CommandObject.cpp:1095
>> #15 0x00007f103cec9559 in
>> lldb_private::CommandInterpreter::HandleCommand(char const*,
>> lldb_private::LazyBool, lldb_private::CommandReturnObject&,
>> lldb_private::ExecutionContext*, bool, bool) (this=this@entry=0x7a5210,
>> command_line=<optimized out>,
>> lazy_add_to_history=lazy_add_to_history@entry=lldb_private::eLazyBoolCalculate,
>> result=..., override_context=override_context@entry=0x0,
>> repeat_on_empty_command=repeat_on_empty_command@entry=true,
>> no_context_switching=false)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Interpreter/CommandInterpreter.cpp:1820
>> #16 0x00007f103ceca50d in
>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>> std::string&) (this=0x7a5210, io_handler=..., line=...) at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Interpreter/CommandInterpreter.cpp:2976
>> #17 0x00007f103ce1c733 in lldb_private::IOHandlerEditline::Run()
>> (this=0x87d9b0)
>> at
>> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/IOHandler.cpp:736
>>
>>
>> Really appreciate if there is any fix/workaround I can get over this issue
>> and unblock us!
>>
>> Jeffrey
>>
>> _______________________________________________
>> lldb-dev mailing list
>> lldb-dev@lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>
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