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Rearrange EmitLValueForField a bit to work properly for _Bool bitfields 

in unions (we don't want to do the union-specific bitcast for 
bit-fields).

llvm-svn: 51678
This commit is contained in:
Eli Friedman 2008-05-29 11:33:25 +00:00
parent 045bf4ff82
commit 133e8040ca
2 changed files with 12 additions and 10 deletions
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19
clang/lib/CodeGen/CGExpr.cpp
View File

@ -557,9 +557,7 @@ LValue CodeGenFunction::EmitLValueForField(llvm::Value* BaseValue,
llvm::Value *V;
unsigned idx = CGM.getTypes().getLLVMFieldNo(Field);
if (!Field->isBitField()) {
V = Builder.CreateStructGEP(BaseValue, idx, "tmp");
} else {
if (Field->isBitField()) {
// FIXME: CodeGenTypes should expose a method to get the appropriate
// type for FieldTy (the appropriate type is ABI-dependent).
unsigned EltTySize =
@ -574,8 +572,15 @@ LValue CodeGenFunction::EmitLValueForField(llvm::Value* BaseValue,
V = Builder.CreateGEP(BaseValue,
llvm::ConstantInt::get(llvm::Type::Int32Ty, idx),
"tmp");
CodeGenTypes::BitFieldInfo bitFieldInfo =
CGM.getTypes().getBitFieldInfo(Field);
return LValue::MakeBitfield(V, bitFieldInfo.Begin, bitFieldInfo.Size,
Field->getType()->isSignedIntegerType());
}
V = Builder.CreateStructGEP(BaseValue, idx, "tmp");
// Match union field type.
if (isUnion) {
const llvm::Type * FieldTy = ConvertType(Field->getType());
@ -587,13 +592,7 @@ LValue CodeGenFunction::EmitLValueForField(llvm::Value* BaseValue,
"tmp");
}
if (!Field->isBitField())
return LValue::MakeAddr(V);
CodeGenTypes::BitFieldInfo bitFieldInfo =
CGM.getTypes().getBitFieldInfo(Field);
return LValue::MakeBitfield(V, bitFieldInfo.Begin, bitFieldInfo.Size,
Field->getType()->isSignedIntegerType());
return LValue::MakeAddr(V);
}
LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr* E) {

3
clang/test/CodeGen/union.c
View File

@ -36,3 +36,6 @@ typedef union{
} q;
int qfunc() {q buf; unsigned char* x = buf.x;}
union RR {_Bool a : 1;} RRU;
int RRF(void) {return RRU.a;}