Avoid a crash when trying to parse a line table in the DWARF parser.

llvm-svn: 167236

diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
index 56689f5..73f4166 100644 (file)
--- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -961,19 +961,21 @@ SymbolFileDWARF::ParseCompileUnitSupportFiles (const SymbolContext& sc, FileSpec
 {
     assert (sc.comp_unit);
     DWARFCompileUnit* dwarf_cu = GetDWARFCompileUnit(sc.comp_unit);
-    assert (dwarf_cu);
-    const DWARFDebugInfoEntry * cu_die = dwarf_cu->GetCompileUnitDIEOnly();
-
-    if (cu_die)
+    if (dwarf_cu)
     {
-        const char * cu_comp_dir = cu_die->GetAttributeValueAsString(this, dwarf_cu, DW_AT_comp_dir, NULL);
-        dw_offset_t stmt_list = cu_die->GetAttributeValueAsUnsigned(this, dwarf_cu, DW_AT_stmt_list, DW_INVALID_OFFSET);
+        const DWARFDebugInfoEntry * cu_die = dwarf_cu->GetCompileUnitDIEOnly();
 
-        // All file indexes in DWARF are one based and a file of index zero is
-        // supposed to be the compile unit itself.
-        support_files.Append (*sc.comp_unit);
+        if (cu_die)
+        {
+            const char * cu_comp_dir = cu_die->GetAttributeValueAsString(this, dwarf_cu, DW_AT_comp_dir, NULL);
+            dw_offset_t stmt_list = cu_die->GetAttributeValueAsUnsigned(this, dwarf_cu, DW_AT_stmt_list, DW_INVALID_OFFSET);
 
-        return DWARFDebugLine::ParseSupportFiles(sc.comp_unit->GetModule(), get_debug_line_data(), cu_comp_dir, stmt_list, support_files);
+            // All file indexes in DWARF are one based and a file of index zero is
+            // supposed to be the compile unit itself.
+            support_files.Append (*sc.comp_unit);
+
+            return DWARFDebugLine::ParseSupportFiles(sc.comp_unit->GetModule(), get_debug_line_data(), cu_comp_dir, stmt_list, support_files);
+        }
     }
     return false;
 }