diff options
| author | Devang Patel <dpatel@apple.com> | 2010-02-03 20:08:48 +0000 |
|---|---|---|
| committer | Devang Patel <dpatel@apple.com> | 2010-02-03 20:08:48 +0000 |
| commit | c1dc8fff79eecc154eb6a62d652c5209d71c031b (patch) | |
| tree | ae1cdca76ba0c4d38bd27112f88d61e906737904 /lib/CodeGen | |
| parent | 4e0d19dfd9ab77f9974cb07320dfe4f7f5ffd7b9 (diff) | |
Emit appropriate expression to find virtual base offset.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95242 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/AsmPrinter/DwarfDebug.cpp | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp index 90da2d7bc0..e46916e6d9 100644 --- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp +++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp @@ -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, |