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Revert "Debug Info: One more bitfield bugfix. While yesterday's r240853 fixed"

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This reverts commit 240890. Breaking the gdb buildbot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240893 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl 2015-06-27 21:55:00 +00:00
parent 0bd9021d62
commit 1e7ecc8e57
2 changed files with 14 additions and 19 deletions
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31
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -1361,29 +1361,24 @@ void DwarfUnit::constructMemberDIE(DIE &Buffer, const DIDerivedType *DT) {
// | ... |b1|b2|b3|b4|
// +-----------+-----*-----+-----*-----+--
// | | |<-- Size ->| |
// |<---- Offset --->| | |<--->|
// | | | | \_ DW_AT_bit_offset (little endian)
// | |<--->| |
// |<--big-e.->| \_ StartBitOffset = DW_AT_bit_offset (big endian)
// | ^ | = DW_AT_data_bit_offset (biendian)
// | OffsetInBytes |
// | v |
// |<----little-endian---->|
// |<---- Offset --->| |<--->|
// | | | \_ DW_AT_bit_offset (little endian)
// | |<--->|
// |<--------->| \_ StartBitOffset = DW_AT_bit_offset (big endian)
// \ = DW_AT_data_bit_offset (biendian)
// \_ OffsetInBytes
uint64_t Offset = DT->getOffsetInBits();
uint64_t Align = DT->getAlignInBits() ? DT->getAlignInBits() : FieldSize;
uint64_t AlignMask = ~(Align - 1);
// The bits from the start of the storage unit to the start of the field.
uint64_t StartBitOffset = Offset - (Offset & AlignMask);
// OffsetInBytes is the byte offset of the field's aligned storage unit
// inside the struct.
uint64_t DwarfBitOffset;
if (Asm->getDataLayout().isLittleEndian()) {
DwarfBitOffset = OffsetToAlignment(Offset + Size, Align);
OffsetInBytes = ((Offset + Size) & AlignMask) / 8;
} else {
DwarfBitOffset = StartBitOffset;
OffsetInBytes = (Offset - StartBitOffset) / 8;
}
// The endian-dependent DWARF 2 offset.
uint64_t DwarfBitOffset = Asm->getDataLayout().isLittleEndian()
? OffsetToAlignment(Offset + Size, Align)
: StartBitOffset;
// The byte offset of the field's aligned storage unit inside the struct.
OffsetInBytes = (Offset - StartBitOffset) / 8;
addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, DwarfBitOffset);
} else
// This is not a bitfield.

2
test/DebugInfo/ARM/bitfield.ll
View File

@ -14,7 +14,7 @@
; CHECK: DW_AT_byte_size {{.*}} (0x04)
; CHECK: DW_AT_bit_size {{.*}} (0x1c)
; CHECK: DW_AT_bit_offset {{.*}} (0x18)
; CHECK: DW_AT_data_member_location {{.*}}04
; CHECK: DW_AT_data_member_location {{.*}}00
target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
target triple = "thumbv7-apple-ios"