[CodeView] Implement support for bitfields in LLVM
CodeView need to know the offset of the storage allocation for a
bitfield. Encode this via the "extraData" field in DIDerivedType and
introduced a new flag, DIFlagBitField, to indicate whether or not a
member is a bitfield.
This fixes PR28162.
Differential Revision: http://reviews.llvm.org/D21782
llvm-svn: 274200
diff --git a/llvm/lib/IR/DIBuilder.cpp b/llvm/lib/IR/DIBuilder.cpp
index ab03365..ce16fdd 100644
--- a/llvm/lib/IR/DIBuilder.cpp
+++ b/llvm/lib/IR/DIBuilder.cpp
@@ -308,6 +308,18 @@
return nullptr;
}
+DIDerivedType *DIBuilder::createBitFieldMemberType(
+ DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNumber,
+ uint64_t SizeInBits, uint64_t AlignInBits, uint64_t OffsetInBits,
+ uint64_t StorageOffsetInBits, unsigned Flags, DIType *Ty) {
+ Flags |= DINode::FlagBitField;
+ return DIDerivedType::get(
+ VMContext, dwarf::DW_TAG_member, Name, File, LineNumber,
+ getNonCompileUnitScope(Scope), Ty, SizeInBits, AlignInBits, OffsetInBits,
+ Flags, ConstantAsMetadata::get(ConstantInt::get(
+ IntegerType::get(VMContext, 64), StorageOffsetInBits)));
+}
+
DIDerivedType *DIBuilder::createStaticMemberType(DIScope *Scope, StringRef Name,
DIFile *File,
unsigned LineNumber,