C++ AggValueSlot::asRValue方法代码示例

RValue AtomicInfo::convertTempToRValue(llvm::Value *addr,
                                       AggValueSlot resultSlot) const {
  if (EvaluationKind == TEK_Aggregate) {
    // Nothing to do if the result is ignored.
    if (resultSlot.isIgnored()) return resultSlot.asRValue();

    assert(resultSlot.getAddr() == addr || hasPadding());

    // In these cases, we should have emitted directly into the result slot.
    if (!hasPadding() || resultSlot.isValueOfAtomic())
      return resultSlot.asRValue();

    // Otherwise, fall into the common path.
  }

  // Drill into the padding structure if we have one.
  if (hasPadding())
    addr = CGF.Builder.CreateStructGEP(addr, 0);

  // If we're emitting to an aggregate, copy into the result slot.
  if (EvaluationKind == TEK_Aggregate) {
    CGF.EmitAggregateCopy(resultSlot.getAddr(), addr, getValueType(),
                          resultSlot.isVolatile());
    return resultSlot.asRValue();
  }

  // Otherwise, just convert the temporary to an r-value using the
  // normal conversion routine.
  return CGF.convertTempToRValue(addr, getValueType());
}

void AggExprEmitter::VisitBinAssign(const BinaryOperator *E) {
  // For an assignment to work, the value on the right has
  // to be compatible with the value on the left.
  assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
                                                 E->getRHS()->getType())
         && "Invalid assignment");

  // FIXME:  __block variables need the RHS evaluated first!
  LValue LHS = CGF.EmitLValue(E->getLHS());

  // We have to special case property setters, otherwise we must have
  // a simple lvalue (no aggregates inside vectors, bitfields).
  if (LHS.isPropertyRef()) {
    AggValueSlot Slot = EnsureSlot(E->getRHS()->getType());
    CGF.EmitAggExpr(E->getRHS(), Slot);
    CGF.EmitStoreThroughPropertyRefLValue(Slot.asRValue(), LHS);
  } else {
    bool GCollection = false;
    if (CGF.getContext().getLangOptions().getGCMode())
      GCollection = TypeRequiresGCollection(E->getLHS()->getType());

    // Codegen the RHS so that it stores directly into the LHS.
    AggValueSlot LHSSlot = AggValueSlot::forLValue(LHS, true, 
                                                   GCollection);
    CGF.EmitAggExpr(E->getRHS(), LHSSlot, false);
    EmitFinalDestCopy(E, LHS, true);
  }
}

RValue AtomicInfo::convertTempToRValue(llvm::Value *addr,
                                       AggValueSlot resultSlot,
                                       SourceLocation loc) const {
  if (EvaluationKind == TEK_Aggregate)
    return resultSlot.asRValue();

  // Drill into the padding structure if we have one.
  if (hasPadding())
    addr = CGF.Builder.CreateStructGEP(addr, 0);

  // Otherwise, just convert the temporary to an r-value using the
  // normal conversion routine.
  return CGF.convertTempToRValue(addr, getValueType(), loc);
}