commit f1f30d4f47a32392c93f4d00e47af7519f331fa7
author Devang Patel <dpatel@apple.com> Tue Feb 17 21:23:59 2009 +0000
committer Devang Patel <dpatel@apple.com> Tue Feb 17 21:23:59 2009 +0000
tree f35a164ccccd774618350c06270144469cd78830
parent 74cd6d429d590efefc3d1a7c5587f1c9dddd4d80

Emit debug info for bitfields.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64815 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/DebugInfo.cpp

diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index 0ec8089..10356e5 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -169,8 +169,8 @@
   }
 }
 
-DIVariable::DIVariable(GlobalVariable *GV) : DIDescriptor(GV) {
-  if (GV && !isVariable(getTag()))
+DIVariable::DIVariable(GlobalVariable *gv) : DIDescriptor(gv) {
+  if (gv && !isVariable(getTag()))
     GV = 0;
 }
 
@@ -273,7 +273,16 @@
   return true;
 }
 
-
+/// getOriginalTypeSize - If this type is derived from a base type then
+/// return base type size.
+uint64_t DIDerivedType::getOriginalTypeSize() const {
+  if (getTag() != dwarf::DW_TAG_member)
+    return getSizeInBits();
+  DIType BT = getTypeDerivedFrom();
+  if (BT.getTag() != dwarf::DW_TAG_base_type)
+    return getSizeInBits();
+  return BT.getSizeInBits();
+}
 
 //===----------------------------------------------------------------------===//
 // DIFactory: Basic Helpers

lib/CodeGen/AsmPrinter/DwarfWriter.cpp

diff --git a/lib/CodeGen/AsmPrinter/DwarfWriter.cpp b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
index 1265b99..5e79a81 100644
--- a/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
@@ -1873,7 +1873,24 @@
 
     AddSourceLine(MemberDie, &DT);
 
-    // FIXME _ Handle bitfields
+    uint64_t Size = DT.getSizeInBits();
+    uint64_t FieldSize = DT.getOriginalTypeSize();
+
+    if (Size != FieldSize) {
+      // Handle bitfield.
+      AddUInt(MemberDie, DW_AT_byte_size, 0, DT.getOriginalTypeSize() >> 3);
+      AddUInt(MemberDie, DW_AT_bit_size, 0, DT.getSizeInBits());
+
+      uint64_t Offset = DT.getOffsetInBits();
+      uint64_t FieldOffset = Offset;
+      uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
+      uint64_t HiMark = (Offset + FieldSize) & AlignMask;
+      FieldOffset = (HiMark - FieldSize);
+      Offset -= FieldOffset;
+      // Maybe we need to work from the other end.
+      if (TD->isLittleEndian()) Offset = FieldSize - (Offset + Size);
+      AddUInt(MemberDie, DW_AT_bit_offset, 0, Offset);
+    }
     DIEBlock *Block = new DIEBlock();
     AddUInt(Block, 0, DW_FORM_data1, DW_OP_plus_uconst);
     AddUInt(Block, 0, DW_FORM_udata, DT.getOffsetInBits() >> 3);