VVMBytecodeDispatcher.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#if WITH_VERSE_VM || defined(__INTELLISENSE__)
 
#include "Templates/UnrealTemplate.h"
#include "VVMBytecode.h"
#include "VVMBytecodeOps.h"
#include "VVMBytecodesAndCaptures.h"
#include "VVMLog.h"
#include "VVMProcedure.h"
 
namespace Verse
{
template <typename HandlerType>
decltype(auto) DispatchOp(FOp& Op, HandlerType&& Handler)
{
    switch (Op.Opcode)
    {
#define VISIT_OP(Name)  \
    case EOpcode::Name: \
        return Handler(static_cast<FOp##Name&>(Op));
 
        VERSE_ENUM_OPS(VISIT_OP)
 
#undef VISIT_OP
    }
    V_DIE("Invalid opcode: %u", static_cast<FOpcodeInt>(Op.Opcode));
}
 
template <typename HandlerType>
void DispatchOps(FOp* OpsBegin, FOp* OpsEnd, HandlerType&& Handler)
{
    FOp* Op = OpsBegin;
    while (Op < OpsEnd)
    {
        Op = DispatchOp(*Op, [&](auto&& Op) -> FOp* {
            Handler(Op);
            return &Op + 1;
        });
    }
}
 
// HandlerType can take in an FOp& or an auto& and descriminate on the actual
// subtype of FOp being passed in.
template <typename HandlerType>
void DispatchOps(VProcedure& Procedure, HandlerType&& Handler)
{
    DispatchOps(Procedure.GetOpsBegin(), Procedure.GetOpsEnd(), Forward<HandlerType>(Handler));
}
 
} // namespace Verse
#endif // WITH_VERSE_VM