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Make CGRecordLayoutBuilder deal with wide bit-fields. Will land tests shortly (Daniel, please review). 

llvm-svn: 101472
This commit is contained in:
Anders Carlsson 2010-04-16 16:23:02 +00:00
parent f13f69f296
commit be6f3181dd
1 changed files with 20 additions and 1 deletions
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21
clang/lib/CodeGen/CGRecordLayoutBuilder.cpp
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@ -153,9 +153,28 @@ static CGBitFieldInfo ComputeBitFieldInfo(CodeGenTypes &Types,
uint64_t TypeSizeInBytes = Types.getTargetData().getTypeAllocSize(Ty);
uint64_t TypeSizeInBits = TypeSizeInBytes * 8;
unsigned StartBit = FieldOffset % TypeSizeInBits;
bool IsSigned = FD->getType()->isSignedIntegerType();
if (FieldSize > TypeSizeInBits) {
// We have a wide bit-field.
CGBitFieldInfo::AccessInfo Component;
Component.FieldIndex = 0;
Component.FieldByteOffset =
TypeSizeInBytes * ((FieldOffset / 8) / TypeSizeInBytes);
Component.FieldBitStart = 0;
Component.AccessWidth = TypeSizeInBits;
// FIXME: This might be wrong!
Component.AccessAlignment = 0;
Component.TargetBitOffset = 0;
Component.TargetBitWidth = TypeSizeInBits;
return CGBitFieldInfo(TypeSizeInBits, 1, &Component, IsSigned);
}
unsigned StartBit = FieldOffset % TypeSizeInBits;
// The current policy is to always access the bit-field using the source type
// of the bit-field. With the C bit-field rules, this implies that we always
// use either one or two accesses, and two accesses can only occur with a