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| 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 | d231689adb9966454451aebc18d99473cc9519f2 (patch) | |
| tree | 0c342176c7cd4e19f028aa0ea983a410402a5be4 /llvm/lib | |
| parent | 999b499024c7a069ce46936bd0f6e9fd2b0609c7 (diff) | |
| download | bcm5719-llvm-d231689adb9966454451aebc18d99473cc9519f2.tar.gz bcm5719-llvm-d231689adb9966454451aebc18d99473cc9519f2.zip | |
Emit appropriate expression to find virtual base offset.
llvm-svn: 95242
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp index 90da2d7bc0a..e46916e6d9c 100644 --- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp +++ b/llvm/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, |
