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      1 //===- TypeRecordHelpers.cpp ------------------------------------*- C++ -*-===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 
      9 #include "llvm/DebugInfo/CodeView/TypeRecordHelpers.h"
     10 
     11 #include "llvm/ADT/SmallVector.h"
     12 #include "llvm/DebugInfo/CodeView/TypeIndexDiscovery.h"
     13 #include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
     14 
     15 using namespace llvm;
     16 using namespace llvm::codeview;
     17 
     18 template <typename RecordT> static ClassOptions getUdtOptions(CVType CVT) {
     19   RecordT Record;
     20   if (auto EC = TypeDeserializer::deserializeAs<RecordT>(CVT, Record)) {
     21     consumeError(std::move(EC));
     22     return ClassOptions::None;
     23   }
     24   return Record.getOptions();
     25 }
     26 
     27 bool llvm::codeview::isUdtForwardRef(CVType CVT) {
     28   ClassOptions UdtOptions = ClassOptions::None;
     29   switch (CVT.kind()) {
     30   case LF_STRUCTURE:
     31   case LF_CLASS:
     32   case LF_INTERFACE:
     33     UdtOptions = getUdtOptions<ClassRecord>(std::move(CVT));
     34     break;
     35   case LF_ENUM:
     36     UdtOptions = getUdtOptions<EnumRecord>(std::move(CVT));
     37     break;
     38   case LF_UNION:
     39     UdtOptions = getUdtOptions<UnionRecord>(std::move(CVT));
     40     break;
     41   default:
     42     return false;
     43   }
     44   return (UdtOptions & ClassOptions::ForwardReference) != ClassOptions::None;
     45 }
     46 
     47 TypeIndex llvm::codeview::getModifiedType(const CVType &CVT) {
     48   assert(CVT.kind() == LF_MODIFIER);
     49   SmallVector<TypeIndex, 1> Refs;
     50   discoverTypeIndices(CVT, Refs);
     51   return Refs.front();
     52 }
     53