Tolerate invalid derived type.

llvm-svn: 86269

Author: Devang Patel

llvm/lib/Analysis/DebugInfo.cpp

@@ -409,6 +409,10 @@ uint64_t DIDerivedType::getOriginalTypeSize() const {
       Tag == dwarf::DW_TAG_const_type || Tag == dwarf::DW_TAG_volatile_type ||
       Tag == dwarf::DW_TAG_restrict_type) {
     DIType BaseType = getTypeDerivedFrom();
+    // If this type is not derived from any type then take conservative 
+    // approach.
+    if (BaseType.isNull())
+      return getSizeInBits();
     if (BaseType.isDerivedType())
       return DIDerivedType(BaseType.getNode()).getOriginalTypeSize();
     else

llvm/test/DebugInfo/2009-11-06-InvalideDerivedType.ll

@@ -0,0 +1,13 @@
+; RUN: llc %s -o /dev/null
+%struct._t = type { i32 }
+
+@s1 = common global %struct._t zeroinitializer, align 4 ; <%struct._t*> [#uses=0]
+
+!llvm.dbg.gv = !{!0}
+
+!0 = metadata !{i32 458804, i32 0, metadata !1, metadata !"s1", metadata !"s1", metadata !"s1", metadata !1, i32 3, metadata !2, i1 false, i1 true, %struct._t* @s1}; [DW_TAG_variable ]
+!1 = metadata !{i32 458769, i32 0, i32 12, metadata !"t.c", metadata !"/tmp", metadata !"clang 1.1", i1 true, i1 false, metadata !"", i32 0}; [DW_TAG_compile_unit ]
+!2 = metadata !{i32 458771, metadata !1, metadata !"_t", metadata !1, i32 1, i64 32, i64 32, i64 0, i32 0, null, metadata !3, i32 0}; [DW_TAG_structure_type ]
+!3 = metadata !{metadata !4}
+!4 = metadata !{i32 458765, metadata !1, metadata !"j", metadata !1, i32 2, i64 32, i64 32, i64 0, i32 0, metadata !5}; [DW_TAG_member ]
+!5 = metadata !{i32 458790, metadata !1, metadata !"", null, i32 0, i64 0, i64 0, i64 0, i32 0, null}; [DW_TAG_const_type ]