// get value object specialized to work with llvm IR types
lldb::ValueObjectSP
ABISysV_hexagon::GetReturnValueObjectImpl( lldb_private::Thread &thread, llvm::Type &retType ) const
{
Value value;
ValueObjectSP vObjSP;
// get the current register context
RegisterContext *reg_ctx = thread.GetRegisterContext().get();
if (!reg_ctx)
return vObjSP;
// for now just pop R0 to find the return value
const lldb_private::RegisterInfo *r0_info = reg_ctx->GetRegisterInfoAtIndex( 0 );
if ( r0_info == nullptr )
return vObjSP;
// void return type
if ( retType.isVoidTy( ) )
{
value.GetScalar( ) = 0;
}
// integer / pointer return type
else
if ( retType.isIntegerTy( ) || retType.isPointerTy( ) )
{
// read r0 register value
lldb_private::RegisterValue r0_value;
if ( !reg_ctx->ReadRegister( r0_info, r0_value ) )
return vObjSP;
// push r0 into value
uint32_t r0_u32 = r0_value.GetAsUInt32( );
// account for integer size
if ( retType.isIntegerTy() && retType.isSized() )
{
uint64_t size = retType.getScalarSizeInBits( );
uint64_t mask = ( 1ull << size ) - 1;
// mask out higher order bits then the type we expect
r0_u32 &= mask;
}
value.GetScalar( ) = r0_u32;
}
// unsupported return type
else
return vObjSP;
// pack the value into a ValueObjectSP
vObjSP = ValueObjectConstResult::Create
(
thread.GetStackFrameAtIndex(0).get(),
value,
ConstString("")
);
return vObjSP;
}
DataType llvm_type_to_nts_type ( const llvm::Type & t )
{
if ( t.isIntegerTy() )
{
auto & it = llvm::cast<llvm::IntegerType> ( t );
return DataType ( ScalarType::BitVector ( it.getBitWidth() ) );
}
/*else if ( t.isPointerTy() ) {
return nts::DataType::BitVector ( 64 ); // 64 bit pointers
}
*/
else
{
throw std::logic_error ( "Only integer types are supported" );
}
}