Method loadValType

lib/loader/ast/type.cpp:123–158

Load binary and decode ValType. See "include/loader/loader.h".

// Load binary and decode ValType. See "include/loader/loader.h".
Expect<ValType> Loader::loadValType(ASTNodeAttr From, bool IsStorageType) {
  // Peek the valtype code.
  auto B = FMgr.peekByte();
  if (unlikely(!B)) {
    return logLoadError(B.error(), FMgr.getLastOffset(), From);
  }

  // Check the first byte for value type cases.
  TypeCode Code = static_cast<TypeCode>(*B);
  switch (Code) {
  case TypeCode::V128:
    if (!Conf.hasProposal(Proposal::SIMD)) {
      return logNeedProposal(ErrCode::Value::MalformedValType, Proposal::SIMD,
                             FMgr.getLastOffset(), From);
    }
    [[fallthrough]];
  case TypeCode::I32:
  case TypeCode::I64:
  case TypeCode::F32:
  case TypeCode::F64:
    FMgr.readByte();
    return ValType(Code);
  case TypeCode::I8:
  case TypeCode::I16:
    // Packed types are for GC proposal. The proposal checking should be handled
    // in the parent scope.
    if (!IsStorageType) {
      return logLoadError(ErrCode::Value::MalformedValType, FMgr.getOffset(),
                          From);
    }
    FMgr.readByte();
    return ValType(Code);
  default:
    return loadRefType(From);
  }
}

Expect<ValMut> Loader::loadMutability(ASTNodeAttr From) {
  // Read the mutability byte.