mirror of https://github.com/ZDoom/gzdoom.git
107 lines
2.6 KiB
C++
107 lines
2.6 KiB
C++
//-----------------------------------------------------------------------------
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//
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// Copyright 2018 Christoph Oelckers
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see http://www.gnu.org/licenses/
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//
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//-----------------------------------------------------------------------------
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//
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//
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// DESCRIPTION: generalized interface for implementing ACS/FS functions
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// in ZScript.
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//
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//-----------------------------------------------------------------------------
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#include "tarray.h"
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#include "dobject.h"
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#include "vm.h"
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#include "scriptutil.h"
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#include "p_acs.h"
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#include "actorinlines.h"
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static TArray<VMValue> parameters;
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static TMap<FName, VMFunction*> functions;
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void ScriptUtil::Clear()
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{
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parameters.Clear();
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functions.Clear();
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}
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void ScriptUtil::BuildParameters(va_list ap)
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{
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for(int type = va_arg(ap, int); type != End; type = va_arg(ap, int))
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{
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switch (type)
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{
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case Int:
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parameters.Push(VMValue(va_arg(ap, int)));
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break;
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case Pointer:
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case Class: // this is just a pointer.
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case String: // must be passed by reference to a persistent location!
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parameters.Push(VMValue(va_arg(ap, void*)));
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break;
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case Float:
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parameters.Push(VMValue(va_arg(ap, double)));
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break;
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}
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}
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}
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void ScriptUtil::RunFunction(FName functionname, unsigned paramstart, VMReturn &returns)
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{
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VMFunction *func = nullptr;
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auto check = functions.CheckKey(functionname);
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if (!check)
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{
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func = PClass::FindFunction(NAME_ScriptUtil, functionname);
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if (func == nullptr)
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{
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I_Error("Call to undefined function ScriptUtil.%s", functionname.GetChars());
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}
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functions.Insert(functionname, func);
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}
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else func = *check;
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VMCall(func, ¶meters[paramstart], parameters.Size() - paramstart, &returns, 1);
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}
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int ScriptUtil::Exec(FName functionname, ...)
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{
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unsigned paramstart = parameters.Size();
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va_list ap;
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va_start(ap, functionname);
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try
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{
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BuildParameters(ap);
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int ret = 0;
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VMReturn returns(&ret);
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RunFunction(functionname, paramstart, returns);
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va_end(ap);
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parameters.Clamp(paramstart);
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return ret;
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}
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catch(...)
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{
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va_end(ap);
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parameters.Clamp(paramstart);
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throw;
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}
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}
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