Author: gclayton
Date: Tue Nov 3 16:40:07 2015
New Revision: 252001
URL: http://llvm.org/viewvc/llvm-project?rev=252001&view=rev
Log:
With the new modules debugging, we have seen cases where clang is not emitting
full definitions for types that are member variables of classes. If we try to
make a class with a member where the type of the class in a forward
declaration, clang will assert and crash and bring down the IDE. This is not
acceptable so we need to work around it. We work around it by making sure that
if we have a member that is an instance (not a pointer or reference) of a
class/struct/union, that it is a complete type. If it isn't then we emit an
error to let the user know to file a bug against the compiler, and then we make
the class complete, but empty. We also do this for base classes elsewhere. We
use the DWARF to help layout the type, so we will get all instance variables
correct, but we just won't have visibility into this instance variable.
Modified:
lldb/trunk/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
Modified: lldb/trunk/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
URL:
http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp?rev=252001&r1=252000&r2=252001&view=diff
==============================================================================
--- lldb/trunk/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
(original)
+++ lldb/trunk/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp Tue Nov
3 16:40:07 2015
@@ -2777,6 +2777,23 @@ DWARFASTParserClang::ParseChildMembers (
}
}
+ if
(ClangASTContext::IsCXXClassType(member_clang_type) &&
member_clang_type.GetCompleteType() == false)
+ {
+ module_sp->ReportError ("DWARF DIE at
0x%8.8x (class %s) has a member variable 0x%8.8x (%s) whose type is a forward
declaration, not a complete definition.\nPlease file a bug against the compiler
and include the preprocessed output for %s",
+
parent_die.GetOffset(),
+
parent_die.GetName(),
+ die.GetOffset(),
+ name,
+ sc.comp_unit ?
sc.comp_unit->GetPath().c_str() : "the source file");
+ // We have no choice other than to pretend
that the member class
+ // is complete. If we don't do this, clang
will crash when trying
+ // to layout the class. Since we provide
layout assistance, all
+ // ivars in this class and other classes
will be fine, this is
+ // the best we can do short of crashing.
+
ClangASTContext::StartTagDeclarationDefinition(member_clang_type);
+
ClangASTContext::CompleteTagDeclarationDefinition(member_clang_type);
+ }
+
field_decl =
ClangASTContext::AddFieldToRecordType (class_clang_type,
name,
member_clang_type,
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