[LLVMdev] assert when mixing static and non-static members with an external AST source
Richard Smith
richard at metafoo.co.uk
Fri Feb 15 11:27:22 PST 2013
Questions about clang should go to cfe-dev@ not here.
On 15 Feb 2013 07:03, "Thirumurthi, Ashok" <ashok.thirumurthi at intel.com>
wrote:
> FYI, this turned out to be an error of omission in LLDB in
> SymbolFileDWARF, because the case of a non-defining external (i.e. a static
> member variable) wasn’t being handled with a variable lookup to dig up the
> location. I’ll put a patch together for lldb-commits,****
>
> ** **
>
> **- **Ashok****
>
> ** **
>
> *From:* llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] *On
> Behalf Of *Thirumurthi, Ashok
> *Sent:* Friday, February 08, 2013 5:59 PM
> *To:* llvmdev at cs.uiuc.edu
> *Cc:* Greg Clayton
> *Subject:* [LLVMdev] assert when mixing static and non-static members
> with an external AST source****
>
> ** **
>
> So, when performing expression evaluation, lldb trips over an assert in
> clang/lib/AST/RecordLayoutBuilder because ExternalFieldOffsets doesn’t
> contain a FieldDecl that updateExternalFieldOffset expected. I found that
> the assert occurs when both static and non-static member variables are
> present. For instance, with the following, the lldb command ‘expr
> my_test.length()’ does not assert unless m_a is declared:****
>
> ** **
>
> class test****
>
> {****
>
> static const int npos = -1;****
>
> int m_a;****
>
> ** **
>
> public:****
>
> int length() { return npos; }****
>
> };****
>
> ** **
>
> The problem reproduces with Linux x86_64 targets, but not on Darwin. The
> issue was introduced in the last month or so, but I’m not sure if it’s an
> issue with lldb or clang. The problem isn’t related to the order of the
> definition of npos and m_a. It reproduces with “static int npos” as well.
> Any thoughts on how to dig deeper into this interaction would be
> appreciated. Some steps to reproduce and stack trace below. Thanks,****
>
> ** **
>
> **- **Ashok Thirumurthi****
>
> ** **
>
> clang++ -gdwarf-2 -O0 -c -o main.o main.cpp****
>
> clang++ -gdwarf-2 -O0 -arch x86_64 main.o -o "a.out"****
>
> ** **
>
> $ lldb a.out****
>
> (lldb) b main.cpp:13****
>
> (lldb) r****
>
> 10 int main (int argc, char const *argv[])****
>
> 11 {****
>
> 12 test my_test;****
>
> -> 13 my_test.length();****
>
> 14 }****
>
> (lldb) expr my_test.length()****
>
> lldb:
> /home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp:2269:
> uint64_t <anonymous
> namespace>::RecordLayoutBuilder::updateExternalFieldOffset(const
> clang::FieldDecl *, uint64_t): Assertion `ExternalFieldOffsets.find(Field)
> != ExternalFieldOffsets.end() && "Field does not have an external offset"'
> failed.****
>
> ** **
>
> ** **
>
> #3 0x00007ffff27c5192 in __GI___assert_fail (****
>
> assertion=0x7ffff69416ce "ExternalFieldOffsets.find(Field) !=
> ExternalFieldOffsets.end() && \"Field does not have an external offset\"",
> ****
>
> file=0x7ffff693e8fe
> "/home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp",
> line=2269, ****
>
> function=0x7ffff6941739 "uint64_t <anonymous
> namespace>::RecordLayoutBuilder::updateExternalFieldOffset(const
> clang::FieldDecl *, uint64_t)") at assert.c:103****
>
> #4 0x00007ffff49f136a in (anonymous
> namespace)::RecordLayoutBuilder::updateExternalFieldOffset
> (this=0x7fffffff5328, Field=0xbedad0, ComputedOffset=0)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp:2268
> ****
>
> #5 0x00007ffff49f00a0 in (anonymous
> namespace)::RecordLayoutBuilder::LayoutField (this=0x7fffffff5328,
> D=0xbedad0)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp:2134
> ****
>
> #6 0x00007ffff49f3669 in (anonymous
> namespace)::RecordLayoutBuilder::LayoutFields (this=0x7fffffff5328,
> D=0xbed9c0)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp:1833
> ****
>
> #7 0x00007ffff49ed73e in (anonymous
> namespace)::RecordLayoutBuilder::Layout (this=0x7fffffff5328, RD=0xbed9c0)
> ****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp:1649
> ****
>
> #8 0x00007ffff49ed151 in clang::ASTContext::getASTRecordLayout
> (this=0xbc8820, D=0xbed9c0)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp:2430
> ****
>
> #9 0x00007ffff433d48f in lldb_private::ClangASTSource::layoutRecordType
> (this=0xcb6f00, record=0xd6a140, size=@0x7fffffff6388: 4,
> alignment=@0x7fffffff6390: 29, ****
>
> field_offsets=..., base_offsets=..., virtual_base_offsets=...) at
> /home/athirumurthi/git/lldb/tools/lldb/source/Expression/ClangASTSource.cpp:1456
> ****
>
> #10 0x00007ffff436b0ff in
> lldb_private::ClangASTSource::ClangASTSourceProxy::layoutRecordType(clang::RecordDecl
> const*, unsigned long&, unsigned long&, llvm::DenseMap<clang::FieldDecl
> const*, unsigned long, llvm::DenseMapInfo<clang::FieldDecl const*> >&,
> llvm::DenseMap<clang::CXXRecordDecl const*, clang::CharUnits,
> llvm::DenseMapInfo<clang::CXXRecordDecl const*> >&,
> llvm::DenseMap<clang::CXXRecordDecl const*, clang::CharUnits,
> llvm::DenseMapInfo<clang::CXXRecordDecl const*> >&) ()****
>
> from /home/athirumurthi/git/lldb/install/bin/../lib/liblldb.so****
>
> #11 0x00007ffff49ef879 in (anonymous
> namespace)::RecordLayoutBuilder::InitializeLayout (this=0x7fffffff60d8,
> D=0xd6a140)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp:1615
> ****
>
> #12 0x00007ffff49ed71b in (anonymous
> namespace)::RecordLayoutBuilder::Layout (this=0x7fffffff60d8, RD=0xd6a140)
> ****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp:1644
> ****
>
> #13 0x00007ffff49ed151 in clang::ASTContext::getASTRecordLayout
> (this=0xd52ce0, D=0xd6a140)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/AST/RecordLayoutBuilder.cpp:2430
> ****
>
> #14 0x00007ffff4c46af0 in (anonymous
> namespace)::CGRecordLayoutBuilder::Layout (this=0x7fffffff66a8, D=0xd6a140)
> ****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGRecordLayoutBuilder.cpp:208
> ****
>
> #15 0x00007ffff4c461ab in
> clang::CodeGen::CodeGenTypes::ComputeRecordLayout (this=0xd63d90,
> D=0xd6a140, Ty=0xd65c10)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGRecordLayoutBuilder.cpp:969
> ****
>
> #16 0x00007ffff4cce43f in
> clang::CodeGen::CodeGenTypes::ConvertRecordDeclType (this=0xd63d90,
> RD=0xd6a140)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenTypes.cpp:637**
> **
>
> #17 0x00007ffff4ccce5e in clang::CodeGen::CodeGenTypes::ConvertType
> (this=0xd63d90, T=...) at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenTypes.cpp:295**
> **
>
> #18 0x00007ffff4cccd67 in clang::CodeGen::CodeGenTypes::ConvertTypeForMem
> (this=0xd63d90, T=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenTypes.cpp:88***
> *
>
> #19 0x00007ffff4ccd201 in clang::CodeGen::CodeGenTypes::ConvertType
> (this=0xd63d90, T=...) at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenTypes.cpp:403**
> **
>
> #20 0x00007ffff4cccd67 in clang::CodeGen::CodeGenTypes::ConvertTypeForMem
> (this=0xd63d90, T=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenTypes.cpp:88***
> *
>
> #21 0x00007ffff4c7bb64 in
> clang::CodeGen::CodeGenModule::GetAddrOfGlobalVar (this=0xd63cf0,
> D=0xd6a500, Ty=0x0)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenModule.cpp:1490
> ****
>
> #22 0x00007ffff4b92ae9 in EmitGlobalVarDeclLValue (CGF=..., E=0xd6a558,
> VD=0xd6a500) at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGExpr.cpp:1586****
>
> #23 0x00007ffff4b8abd7 in
> clang::CodeGen::CodeGenFunction::EmitDeclRefLValue (this=0x7fffffff9198,
> E=0xd6a558)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGExpr.cpp:1659
> ****
>
> #24 0x00007ffff4b851aa in clang::CodeGen::CodeGenFunction::EmitLValue
> (this=0x7fffffff9198, E=0xd6a558)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGExpr.cpp:723*
> ***
>
> #25 0x00007ffff4baaf35 in
> clang::CodeGen::CodeGenFunction::EmitCXXMemberCallExpr
> (this=0x7fffffff9198, CE=0xd6a5b0, ReturnValue=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGExprCXX.cpp:234****
>
> #26 0x00007ffff4b94c41 in clang::CodeGen::CodeGenFunction::EmitCallExpr
> (this=0x7fffffff9198, E=0xd6a5b0, ReturnValue=...)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGExpr.cpp:2696
> ****
>
> #27 0x00007ffff4bdbbe4 in (anonymous
> namespace)::ScalarExprEmitter::VisitCallExpr (this=0x7fffffff7d98,
> E=0xd6a5b0)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGExprScalar.cpp:282**
> **
>
> #28 0x00007ffff4bdbc68 in clang::StmtVisitorBase<clang::make_ptr,
> (anonymous namespace)::ScalarExprEmitter,
> llvm::Value*>::VisitCXXMemberCallExpr (this=0x7fffffff7d98, ****
>
> S=0xd6a5b0) at
> /home/athirumurthi/git/lldb/build/tools/clang/lib/CodeGen/../../include/clang/AST/StmtNodes.inc:283
> ****
>
> #29 0x00007ffff4bd7bb5 in clang::StmtVisitorBase<clang::make_ptr,
> (anonymous namespace)::ScalarExprEmitter, llvm::Value*>::Visit
> (this=0x7fffffff7d98, S=0xd6a5b0)****
>
> at
> /home/athirumurthi/git/lldb/build/tools/clang/lib/CodeGen/../../include/clang/AST/StmtNodes.inc:283
> ****
>
> #30 0x00007ffff4bce7b8 in (anonymous namespace)::ScalarExprEmitter::Visit
> (this=0x7fffffff7d98, E=0xd6a5b0)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGExprScalar.cpp:162**
> **
>
> #31 0x00007ffff4bce758 in clang::CodeGen::CodeGenFunction::EmitScalarExpr
> (this=0x7fffffff9198, E=0xd6a5b0, IgnoreResultAssign=false)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGExprScalar.cpp:3042*
> ***
>
> #32 0x00007ffff4b6b751 in clang::CodeGen::CodeGenFunction::EmitScalarInit
> (this=0x7fffffff9198, init=0xd6a5b0, D=0xd6a630, lvalue=...,
> capturedByInit=false)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGDecl.cpp:536*
> ***
>
> #33 0x00007ffff4b75d22 in EmitDeclInit (CGF=..., D=..., DeclPtr=0xd83068)
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGDeclCXX.cpp:46***
> *
>
> #34 0x00007ffff4b758c7 in
> clang::CodeGen::CodeGenFunction::EmitCXXGlobalVarDeclInit
> (this=0x7fffffff9198, D=..., DeclPtr=0xd83068, PerformInit=true)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGDeclCXX.cpp:134****
>
> #35 0x00007ffff4cd726f in (anonymous
> namespace)::ItaniumCXXABI::EmitGuardedInit (this=0xd64510, CGF=..., D=...,
> var=0xd83068, shouldPerformInit=true)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/ItaniumCXXABI.cpp:1117
> ****
>
> #36 0x00007ffff4b766ce in
> clang::CodeGen::CodeGenFunction::EmitCXXGuardedInit (this=0x7fffffff9198,
> D=..., DeclPtr=0xd83068, PerformInit=true)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGDeclCXX.cpp:215****
>
> #37 0x00007ffff4b6b3da in
> clang::CodeGen::CodeGenFunction::AddInitializerToStaticVarDecl
> (this=0x7fffffff9198, D=..., GV=0xd83068)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGDecl.cpp:232*
> ***
>
> #38 0x00007ffff4b6a94c in
> clang::CodeGen::CodeGenFunction::EmitStaticVarDecl (this=0x7fffffff9198,
> D=..., Linkage=llvm::GlobalValue::InternalLinkage)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGDecl.cpp:311*
> ***
>
> #39 0x00007ffff4b6a6f6 in clang::CodeGen::CodeGenFunction::EmitVarDecl
> (this=0x7fffffff9198, D=...) at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGDecl.cpp:128****
>
> #40 0x00007ffff4b6a4e7 in clang::CodeGen::CodeGenFunction::EmitDecl
> (this=0x7fffffff9198, D=...) at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGDecl.cpp:93****
>
> #41 0x00007ffff4c52a65 in clang::CodeGen::CodeGenFunction::EmitDeclStmt
> (this=0x7fffffff9198, S=...)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGStmt.cpp:809*
> ***
>
> #42 0x00007ffff4c4e2a5 in clang::CodeGen::CodeGenFunction::EmitSimpleStmt
> (this=0x7fffffff9198, S=0xd6a688)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGStmt.cpp:176*
> ***
>
> #43 0x00007ffff4c4dbb7 in clang::CodeGen::CodeGenFunction::EmitStmt
> (this=0x7fffffff9198, S=0xd6a688)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGStmt.cpp:47**
> **
>
> #44 0x00007ffff4c5288e in
> clang::CodeGen::CodeGenFunction::EmitCompoundStmt (this=0x7fffffff9198,
> S=..., GetLast=false, AggSlot=...)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGStmt.cpp:203*
> ***
>
> #45 0x00007ffff4c4e283 in clang::CodeGen::CodeGenFunction::EmitSimpleStmt
> (this=0x7fffffff9198, S=0xd6a608)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenFunction.h:2005
> ****
>
> #46 0x00007ffff4c4dbb7 in clang::CodeGen::CodeGenFunction::EmitStmt
> (this=0x7fffffff9198, S=0xd6a608)****
>
> at /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CGStmt.cpp:47**
> **
>
> #47 0x00007ffff4c6ca7e in
> clang::CodeGen::CodeGenFunction::EmitFunctionBody (this=0x7fffffff9198,
> Args=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenFunction.cpp:489
> ****
>
> #48 0x00007ffff4c6ce8d in clang::CodeGen::CodeGenFunction::GenerateCode
> (this=0x7fffffff9198, GD=..., Fn=0xd61b30, FnInfo=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenFunction.cpp:557
> ****
>
> #49 0x00007ffff4c7ab86 in
> clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition (this=0xd63cf0,
> GD=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenModule.cpp:2115
> ****
>
> #50 0x00007ffff4c77e17 in
> clang::CodeGen::CodeGenModule::EmitGlobalDefinition (this=0xd63cf0, GD=...)
> ****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenModule.cpp:1204
> ****
>
> #51 0x00007ffff4c79fd5 in clang::CodeGen::CodeGenModule::EmitGlobal
> (this=0xd63cf0, GD=...) at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenModule.cpp:1080
> ****
>
> #52 0x00007ffff4c80143 in clang::CodeGen::CodeGenModule::EmitTopLevelDecl
> (this=0xd63cf0, D=0xd6a090)****
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/CodeGenModule.cpp:2783
> ****
>
> #53 0x00007ffff4cdaf54 in (anonymous
> namespace)::CodeGeneratorImpl::HandleTopLevelDecl (this=0xd5cde0, DG=...)*
> ***
>
> at
> /home/athirumurthi/git/lldb/tools/clang/lib/CodeGen/ModuleBuilder.cpp:69**
> **
>
> #54 0x00007ffff4332dd3 in
> lldb_private::ASTResultSynthesizer::HandleTopLevelDecl (this=0xd5e320,
> D=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/lldb/source/Expression/ASTResultSynthesizer.cpp:125
> ****
>
> #55 0x00007ffff4ef055c in clang::ParseAST (S=..., PrintStats=false,
> SkipFunctionBodies=false) at
> /home/athirumurthi/git/lldb/tools/clang/lib/Parse/ParseAST.cpp:131****
>
> #56 0x00007ffff4ef032a in clang::ParseAST (PP=..., Consumer=0xd5e320,
> Ctx=..., PrintStats=false, TUKind=clang::TU_Complete,
> CompletionConsumer=0x0, ****
>
> SkipFunctionBodies=false) at
> /home/athirumurthi/git/lldb/tools/clang/lib/Parse/ParseAST.cpp:85****
>
> #57 0x00007ffff4362a6a in lldb_private::ClangExpressionParser::Parse
> (this=0x7fffffffa658, stream=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/lldb/source/Expression/ClangExpressionParser.cpp:393
> ****
>
> #58 0x00007ffff4372546 in lldb_private::ClangUserExpression::Parse
> (this=0xcb4020, error_stream=..., exe_ctx=..., ****
>
> execution_policy=lldb_private::eExecutionPolicyOnlyWhenNeeded,
> keep_result_in_memory=true)****
>
> at
> /home/athirumurthi/git/lldb/tools/lldb/source/Expression/ClangUserExpression.cpp:449
> ****
>
> #59 0x00007ffff4373dad in
> lldb_private::ClangUserExpression::EvaluateWithError (exe_ctx=...,
> execution_policy=lldb_private::eExecutionPolicyOnlyWhenNeeded, ****
>
> language=lldb::eLanguageTypeUnknown,
> desired_type=lldb_private::ClangExpression::eResultTypeAny,
> unwind_on_error=false, ignore_breakpoints=false, ****
>
> expr_cstr=0xc3d558 "my_test.length()", expr_prefix=0x0,
> result_valobj_sp=..., error=..., run_others=true, timeout_usec=0)****
>
> at
> /home/athirumurthi/git/lldb/tools/lldb/source/Expression/ClangUserExpression.cpp:862
> ****
>
> #60 0x00007ffff4373b4c in lldb_private::ClangUserExpression::Evaluate
> (exe_ctx=...,
> execution_policy=lldb_private::eExecutionPolicyOnlyWhenNeeded, ****
>
> language=lldb::eLanguageTypeUnknown,
> desired_type=lldb_private::ClangExpression::eResultTypeAny,
> unwind_on_error=false, ignore_breakpoints=false, ****
>
> expr_cstr=0xc3d558 "my_test.length()", expr_prefix=0x0,
> result_valobj_sp=..., run_others=true, timeout_usec=0)****
>
> at
> /home/athirumurthi/git/lldb/tools/lldb/source/Expression/ClangUserExpression.cpp:803
> ****
>
> #61 0x00007ffff46ddfa4 in lldb_private::Target::EvaluateExpression
> (this=0x69af90, expr_cstr=0xc3d558 "my_test.length()",
> frame=0x7fffd004a920, result_valobj_sp=..., ****
>
> options=...) at
> /home/athirumurthi/git/lldb/tools/lldb/source/Target/Target.cpp:1841****
>
> #62 0x00007ffff419a180 in
> lldb_private::CommandObjectExpression::EvaluateExpression (this=0x62efb0,
> expr=0xc3d558 "my_test.length()", output_stream=0x9f2860, ****
>
> error_stream=0x9f28c8, result=0x9f2860) at
> /home/athirumurthi/git/lldb/tools/lldb/source/Commands/CommandObjectExpression.cpp:340
> ****
>
> #63 0x00007ffff419ac2d in lldb_private::CommandObjectExpression::DoExecute
> (this=0x62efb0, command=0xc3d558 "my_test.length()", result=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/lldb/source/Commands/CommandObjectExpression.cpp:540
> ****
>
> #64 0x00007ffff43df604 in lldb_private::CommandObjectRaw::Execute
> (this=0x62efb0, args_string=0xc3d558 "my_test.length()", result=...)****
>
> at
> /home/athirumurthi/git/lldb/tools/lldb/source/Interpreter/CommandObject.cpp:999
> ****
>
> #65 0x00007ffff43d1c9b in lldb_private::CommandInterpreter::HandleCommand
> (this=0x626ca0, command_line=0x7fffe8000ea8 "expr my_test.length()", ****
>
> lazy_add_to_history=lldb_private::eLazyBoolYes, result=...,
> override_context=0x0, repeat_on_empty_command=true,
> no_context_switching=false)****
>
> at
> /home/athirumurthi/git/lldb/tools/lldb/source/Interpreter/CommandInterpreter.cpp:1747
> ****
>
> #66 0x00007ffff40f1a85 in lldb::SBCommandInterpreter::HandleCommand
> (this=0x7fffffffb5c0, command_line=0x7fffe8000ea8 "expr my_test.length()",
> result=..., ****
>
> add_to_history=true) at
> /home/athirumurthi/git/lldb/tools/lldb/source/API/SBCommandInterpreter.cpp:122
> ****
>
> #67 0x000000000040c986 in Driver::HandleIOEvent (this=0x7fffffffe270,
> event=...) at
> /home/athirumurthi/git/lldb/tools/lldb/tools/driver/Driver.cpp:1051****
>
> #68 0x000000000040e2aa in Driver::MainLoop (this=0x7fffffffe270) at
> /home/athirumurthi/git/lldb/tools/lldb/tools/driver/Driver.cpp:1516****
>
> #69 0x000000000040ea0b in main (argc=2, argv=0x7fffffffe478,
> envp=0x7fffffffe490) at
> /home/athirumurthi/git/lldb/tools/lldb/tools/driver/Driver.cpp:1672****
>
> ** **
>
> _______________________________________________
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>
>
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