https://llvm.org/bugs/show_bug.cgi?id=24812
Bug ID: 24812
Summary: Expression evaluation crashes when definition of class
not available for a class
Product: lldb
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: tbergham...@google.com
CC: llvm-b...@lists.llvm.org
Classification: Unclassified
Created attachment 14877
--> https://llvm.org/bugs/attachment.cgi?id=14877&action=edit
Source to reproduce the bug
Steps to reproduce:
* Compile the attached inferior with clang++ (tested with clang-3.5 on Linux
x86_64) with the following command line: "clang++ -g ss.cpp"
* lldb a.out
* (lldb) breakpoint set -n main
* (lldb) run
* (lldb) next
* (lldb) expression f
* Observed behavior: LLDB crashes with
"llvm/tools/clang/lib/AST/RecordLayoutBuilder.cpp:2868: const
clang::ASTRecordLayout &clang::ASTContext::getASTRecordLayout(const
clang::RecordDecl *) const: Assertion `D && "Cannot get layout of forward
declarations!"' failed"
* Expected behavior: The content off the variable displayed correctly
* Acceptable behavior: LLDB displays an error message without crashing
The root cause of the problem is that clang only includes the declaration of
std::string in the debug info and expects that the debugger can access to it
from a different source. If "-fno-limit-debug-info" is specified to the
compiler, then the error disappears.
The crash can happen during any part of the debug session (e.g. single
stepping, back tracing), but reproducing it in those cases is more difficult.
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