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Emit appropriate expression to find virtual base offset. 

llvm-svn: 95242
This commit is contained in:
Devang Patel 2010-02-03 20:08:48 +00:00
parent 999b499024
commit d231689adb
1 changed files with 20 additions and 1 deletions
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21
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -1123,7 +1123,26 @@ DIE *DwarfDebug::createMemberDIE(const DIDerivedType &DT) {
// This is not a bitfield.
addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits() >> 3);
addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, MemLocationDie);
if (DT.getTag() == dwarf::DW_TAG_inheritance
&& DT.isVirtual()) {
// For C++, virtual base classes are not at fixed offset. Use following
// expression to extract appropriate offset from vtable.
// BaseAddr = ObAddr + *((*ObAddr) - Offset)
DIEBlock *VBaseLocationDie = new DIEBlock();
addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits());
addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0,
VBaseLocationDie);
} else
addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, MemLocationDie);
if (DT.isProtected())
addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,