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ZExpressions.pas
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ZExpressions.pas
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{Copyright (c) 2020 Ville Krumlinde
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.}
unit ZExpressions;
{
Expressions.
Use global proc RunCode(...) to execute code.
Runtime Virtual Machine
}
{$include zzdc_globalopt.inc}
interface
uses ZClasses;
type
TExpBase = class;
//Expression execution context
PExecutionEnvironment = ^TExecutionEnvironment;
TExecutionEnvironment = record
const
ZcStackSize=16384;
type
TStackElement = NativeUInt;
PStackElement = ^TStackElement;
PExpBase = ^TExpBase;
private
gCurrentPc : PExpBase;
gCurrentBP : integer;
var
ZcStack : array[0..ZcStackSize div SizeOf(TStackElement)] of TStackElement;
ZcStackPtr : PStackElement;
strict private
{$ifdef CALLSTACK}
procedure LogCallstack;
{$endif}
private
function StackGetDepth : integer; inline;
procedure StackPopTo(var X); {$IFDEF RELEASE}inline;{$ENDIF}
procedure StackPopToPointer(var X); {$IFDEF RELEASE}inline;{$ENDIF}
function StackPopFloat : single;
{$ifndef minimal}
procedure ScriptError(const S : string);
{$endif}
{$ifdef CALLSTACK}
procedure CheckNilDeref(P : pointer);
{$endif}
{$if defined(cpux64) or defined(cpuaarch64)}
function StackPopAndGetPtr(const Count : integer) : PStackElement; inline;
{$endif}
public
function StackGetPtrToItem(const Index : integer) : PStackElement; inline;
procedure StackPush(const X); {$IFDEF RELEASE}inline;{$ENDIF}
procedure StackPushPointer(const X); {$IFDEF RELEASE}inline;{$ENDIF}
procedure Init;
end;
//Klass med en expression-prop
TZExpression = class(TCommand)
protected
procedure DefineProperties(List: TZPropertyList); override;
public
Expression : TZExpressionPropValue;
procedure Execute; override;
end;
//User-defined functions
TZLibrary = class(TZComponent)
strict private
Lock : pointer;
HasExecutedInitializer : boolean;
procedure InitGlobalArea;
procedure RemoveManagedTargets;
private
procedure AquireLock;
procedure ReleaseLock;
protected
procedure DefineProperties(List: TZPropertyList); override;
procedure InitAfterPropsAreSet; override;
public
UseThreadLock : boolean;
Source : TZExpressionPropValue;
HasInitializer : boolean;
GlobalArea : pointer; //Storage for non-managed global variables
GlobalAreaSize : integer;
ManagedVariables : TZBinaryPropValue;
procedure Update; override;
destructor Destroy; override;
{$ifndef minimal}
procedure DesignerReset; override;
procedure AddGlobalVar(const Typ : TZcDataType);
{$endif}
end;
//Import of external library (dll)
TZExternalLibrary = class(TZComponent)
strict private
ModuleHandle : NativeUInt;
private
function LoadFunction(P : PAnsiChar) : pointer;
protected
procedure DefineProperties(List: TZPropertyList); override;
public
ModuleName : TPropString;
CallingConvention : (ccStdCall,ccCdecl);
Source : TZExpressionPropValue;
BeforeInitExp : TZExpressionPropValue;
{$ifndef minimal}
DefinitionsFile : TPropString;
function GetDisplayName: ansistring; override;
procedure DesignerReset; override;
destructor Destroy; override;
{$endif}
end;
TDefineVariableBase = class(TZComponent)
protected
procedure DefineProperties(List: TZPropertyList); override;
public
_Type : TZcDataType;
{$ifndef minimal}
function GetDisplayName: ansistring; override;
{$endif}
end;
//Define a global variable that can be used in expressions
TDefineVariable = class(TDefineVariableBase)
strict private
procedure InitManaged;
protected
procedure DefineProperties(List: TZPropertyList); override;
procedure InitAfterPropsAreSet; override;
public
Value : single;
IntValue : integer;
ModelValue : TZComponent;
ByteValue : byte;
StringValue : TPropString;
PointerValue : pointer;
{$ifndef minimal}
procedure DesignerReset; override;
{$endif}
end;
//Define a global constant that can be used in expressions
//Value is copied into code
TDefineConstant = class(TDefineVariableBase)
protected
procedure DefineProperties(List: TZPropertyList); override;
public
Value : single;
IntValue : integer;
StringValue : TPropString;
ByteValue : byte;
{$ifndef minimal}function GetDisplayName: ansistring; override;{$endif}
end;
//Holds a stringconstant used in expressions
//It is automatically inserted in App.ConstantPool
TExpStringConstant = class(TZComponent)
protected
procedure DefineProperties(List: TZPropertyList); override;
public
Value : TPropString;
end;
TArrayDimensions = (dadOne,dadTwo,dadThree);
TDefineArray = class(TDefineVariableBase)
strict private
Data : PFloatArray;
Limit : integer;
AllocItemCount : integer;
AllocType : TZcDataTypeKind;
AllocPtr : PPointer;
IsExternal : boolean;
procedure CleanUpManagedValues(TheType : TZcDataTypeKind; Count : integer; P : PPointer);
procedure AllocData;
private
function PopAndGetElement(Env : PExecutionEnvironment) : PFloat;
protected
procedure DefineProperties(List: TZPropertyList); override;
public
Dimensions : TArrayDimensions;
SizeDim1,SizeDim2,SizeDim3 : integer;
Persistent : boolean;
Values : TZBinaryPropValue;
destructor Destroy; override;
function GetData : PFloat;
function CalcLimit : integer;
function GetElementSize : integer;
function SetExternalData(P: pointer) : PPointer;
end;
//Virtual machine instruction baseclass
TExpBase = class(TZComponent)
protected
procedure Execute(Env : PExecutionEnvironment); virtual; abstract;
{$ifndef minimal}public function ExpAsText : string; virtual;{$endif}
end;
TExpConstantFloat = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Constant : single;
{$ifndef minimal}
function GetDisplayName: ansistring; override;
{$endif}
end;
TExpConstantInt = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Constant : integer;
{$ifndef minimal}
function GetDisplayName: ansistring; override;
{$endif}
end;
TExpOpBinaryKind = (vbkPlus,vbkMinus,vbkMul,vbkDiv,vbkBinaryOr,vbkBinaryAnd,
vbkBinaryShiftLeft,vbkBinaryShiftRight,vbkBinaryXor,vbkMod);
TExpOpBinaryBase = class(TExpBase)
protected
procedure DefineProperties(List: TZPropertyList); override;
public
Kind : TExpOpBinaryKind;
{$ifndef minimal}
constructor Create(OwnerList: TZComponentList; Kind : TExpOpBinaryKind); reintroduce;
function ExpAsText : string; override;
{$endif}
end;
TExpOpBinaryFloat = class(TExpOpBinaryBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
TExpOpBinaryInt = class(TExpOpBinaryBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
TExpOpJumpKind = (jsJumpAlways,jsJumpLT,jsJumpGT,jsJumpLE,jsJumpGE,jsJumpNE,jsJumpEQ);
TExpJump = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Kind : TExpOpJumpKind;
Destination : integer;
_Type : (jutFloat,jutInt,jutString,jutPointer);
{$ifndef minimal}
function ExpAsText : string; override;
{$endif}
end;
TExpFuncCallKind = (fcSin,fcSqrt,fcCos,fcAbs,fcRnd,fcFrac,fcExp,
fcTan,fcCeil,fcFloor,fcAcos,fcAsin,fcLog2,fcRound,
fcRandom,fcAtan2,fcNoise2,fcNoise3,fcClamp,fcPow,fcCenterMouse,
fcSetRandomSeed,fcQuit,
fcJoyGetAxis,fcJoyGetButton,fcJoyGetPOV,fcSystemTime,
fcStringLength,fcStringIndexOf,fcStrToInt,fcOrd,
fcIntToStr,fcSubStr,fcChr,fcCreateModel,fcTrace,
fcTouchGetCount,fcTouchGetX,fcTouchGetY,fcTouchGetID,
fcGetBinaryProp,fcSetBinaryProp,fcGetModels,fcSleep,fcStartThread,
//Mat4
fcMatMultiply,fcMatTransformPoint,fcGetMatrix,fcSetMatrix,
fcVec2,fcVec3,fcVec4
{$ifndef minimal}
,fcGenLValue,
//IDE
fcFindComponent,fcCreateComponent,fcSetNumericProperty,fcSetStringProperty,
fcSetObjectProperty,fcSaveComponentToTextFile,
fcGetStringProperty
{$endif}
);
TExpFuncCallBase = class(TExpBase)
protected
procedure DefineProperties(List: TZPropertyList); override;
public
Kind : TExpFuncCallKind;
{$ifndef minimal}
function ExpAsText : string; override;
{$endif}
end;
//Built-in function call
TExpFuncCall = class(TExpFuncCallBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
//Built-in functions that return pointer
TExpPointerFuncCall = class(TExpFuncCallBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
//Matrix functions
TExpMat4FuncCall = class(TExpFuncCallBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
{$ifndef minimal}
//IDE/Visualizer "meta" functions
TExpIDEFuncCall = class(TExpFuncCallBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
{$endif}
//Push ptr to element in array on stack, used with assign
TExpArrayGetElement = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
//Setup local stack frame
TExpStackFrame = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Size : integer;
end;
//Load/store local value
TExpAccessLocal = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Kind : (loLoad,loStore,loGetAddress);
Index : integer;
{$ifndef minimal}
function ExpAsText : string; override;
{$endif}
end;
//Load/store global (non-managed) value
TExpAccessGlobal = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Kind : (glLoad,glStore,glGetAddress);
Offset : integer;
Lib : TZLibrary;
{$ifndef minimal}
function ExpAsText : string; override;
{$endif}
end;
//Return from function
TExpReturn = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Lib : TZLibrary;
HasFrame : boolean;
HasReturnValue : boolean;
Arguments : integer;
{$ifdef CALLSTACK}
FunctionName : string;
{$endif}
end;
TExpMiscKind = (emPop,emDup,emLoadCurrentModel,emPtrDeref4,emPtrDeref1,
emPtrDerefPointer, emNotifyPropChanged, emLoadNull, emNop, emBinaryNot,
emNot,emGetUserClass,emGetGlobalDataProp);
TExpMisc = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Kind : TExpMiscKind;
{$ifndef minimal}
constructor Create(OwnerList: TZComponentList; Kind : TExpMiscKind); reintroduce;
public function ExpAsText : string; override;
{$endif}
end;
TExpUserFuncCall = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Lib : TZLibrary;
Index : integer;
{$ifndef minimal}
Ref : TObject; //points to TZcOpFunctionUserDefined, used in RetroCoding
{$endif}
end;
TExpExternalFuncCall = class(TExpBase)
strict private
Proc : pointer;
{$if defined(cpux64) or defined(cpuaarch64)}
Trampoline : pointer;
{$endif}
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Lib : TZExternalLibrary;
FuncName : TPropString;
ArgCount : integer;
ReturnType : TZcDataType;
ArgTypes : TPropString;
{$if defined(cpux64) or defined(cpuaarch64)}
destructor Destroy; override;
{$endif}
{$ifndef minimal}
procedure DesignerReset; override;
{$endif}
end;
TExpConvertKind = (eckFloatToInt,eckIntToFloat,eckArrayToXptr,eckBinaryToXptr,
eckPropToVec3,eckPropToVec4);
TExpConvert = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Kind : TExpConvertKind;
end;
//Assign ptr to 4-byte value, both on stack
TExpAssign4 = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
//Assign ptr to 1-byte value, both on stack
TExpAssign1 = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
//Assign ptr to Pointersize value, both on stack
TExpAssignPointer = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
//Join two strings
TExpStringConCat = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
TExpLoadComponent = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Component : TZComponent;
end;
TExpLoadPropOffset = class(TExpBase)
strict private
IsInit : boolean;
Offset : integer;
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
PropId : integer;
end;
TExpLoadModelDefined = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
DefinedIndex : integer;
{$ifndef minimal}
DefinedName : TPropString;
ComponentRef : TZComponent;
{$endif}
end;
TExpAddToPointer = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
end;
TExpInvokeComponent = class(TExpBase)
strict private
InvokeC : TZComponent;
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
InvokedItemList : TZComponentList;
InvokeClassId : integer;
InvokeArgCount : integer;
IsValue : boolean;
end;
TExpInitArray = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Dimensions : TArrayDimensions;
_Type : TZcDataTypeKind;
Size1,Size2,Size3 : integer;
end;
TExpGetRawMemElement = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
_Type : TZcDataTypeKind;
end;
TExpArrayUtil = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
Kind : (auArrayToRawMem, auRawMemToArray, auArrayToArray);
_Type : TZcDataTypeKind;
end;
TExpSwitchTable = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
LowBound,HighBound : integer;
DefaultOrExit : integer;
Jumps : TZBinaryPropValue;
end;
TCodeReturnValue = record
case boolean of
True : (PointerValue : pointer);
False : (SingleValue : single);
end;
TUserClass = class(TZComponent)
protected
procedure DefineProperties(List: TZPropertyList); override;
public
SizeInBytes : integer;
ManagedFields : TZBinaryPropValue;
BaseClass : TUserClass;
Vmt : TZBinaryPropValue;
DefinedInLib : TZLibrary;
InitializerIndex : integer;
end;
TUserClassInstance = class
strict private
ManagedCount : integer;
ManagedCleanup : PPointer;
public
InstanceData : pointer;
TheClass : TUserClass;
constructor Create(TheClass : TUserClass);
destructor Destroy; override;
end;
TExpNewClassInstance = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
TheClass : TUserClass;
end;
TExpVirtualFuncCall = class(TExpBase)
protected
procedure Execute(Env : PExecutionEnvironment); override;
procedure DefineProperties(List: TZPropertyList); override;
public
VmtIndex : integer;
end;
//Run a compiled expression
//Uses global vars for state.
function RunCode(Code : TZComponentList; Env : PExecutionEnvironment=nil) : TCodeReturnValue;
function ExpGetValue(Code : TZComponentList) : single;
function ExpGetPointer(Code : TZComponentList) : PFloat;
implementation
uses ZMath, ZPlatform, ZApplication, ZLog, Meshes,
AudioComponents, AudioPlayer
{$ifndef MSWINDOWS} {$ifdef fpc}, BaseUnix{$endif} {$endif}
{$if (not defined(minimal))}, SysUtils, Math, TypInfo, Classes{$endif}
{$if defined(cpux64) and defined(mswindows)}, Windows{$endif}
;
{$POINTERMATH ON}
function ExpGetValue(Code : TZComponentList) : single;
begin
Result := RunCode(Code).SingleValue;
end;
function ExpGetPointer(Code : TZComponentList) : ZClasses.PFloat;
begin
Result := RunCode(Code).PointerValue;
end;
procedure TExecutionEnvironment.Init;
begin
ZcStackPtr := @ZcStack;
gCurrentBP := 0;
end;
{$if defined(cpux64) or defined(cpuaarch64)}
function TExecutionEnvironment.StackPopAndGetPtr(const Count: integer): PStackElement;
begin
Dec(ZcStackPtr,Count);
Result := ZcStackPtr;
end;
{$endif}
function TExecutionEnvironment.StackGetDepth : integer;
begin
//Returns the number of stack elements from start of stack
Result := (ZcStackPtr - PStackElement(@ZcStack));
end;
//Push 32-bit value
procedure TExecutionEnvironment.StackPush(const X);
begin
{$ifdef debug}
if StackGetDepth>=High(ZcStack) then
ScriptError('Zc Stack Overflow (infinite recursion?)');
{$endif}
PInteger(ZcStackPtr)^ := PInteger(@X)^;
Inc(ZcStackPtr);
end;
//Push 32 or 64-bit value depending on architechture
procedure TExecutionEnvironment.StackPushPointer(const X);
begin
{$ifdef debug}
if StackGetDepth>=High(ZcStack) then
ScriptError('Zc Stack Overflow (infinite recursion?)');
{$endif}
ZcStackPtr^ := TStackElement( PPointer(@X)^ );
Inc(ZcStackPtr);
end;
//Pop 32-bit value
procedure TExecutionEnvironment.StackPopTo(var X);
begin
{$ifdef debug}
if StackGetDepth=0 then
ScriptError('Zc Stack Underflow');
{$endif}
Dec(ZcStackPtr);
PInteger(@X)^ := PInteger(ZcStackPtr)^;
end;
//Pop 32 or 64-bit value depending on architechture
procedure TExecutionEnvironment.StackPopToPointer(var X);
begin
{$ifdef debug}
if StackGetDepth=0 then
ScriptError('Zc Stack Underflow');
{$endif}
Dec(ZcStackPtr);
PPointer(@X)^ := pointer(ZcStackPtr^);
end;
function TExecutionEnvironment.StackPopFloat : single;
begin
StackPopTo(Result);
end;
function TExecutionEnvironment.StackGetPtrToItem(const Index : integer) : PStackElement;
begin
Result := @ZcStack;
Inc(Result,Index);
end;
{$ifdef CALLSTACK}
procedure TExecutionEnvironment.LogCallstack;
var
Log : TLog;
procedure DoOne(P : PExpBase);
begin
while (P<>nil) and (P^<>nil) do
begin
if (P^ is TExpReturn) then
begin
Log.Error(TExpReturn(P^).FunctionName);
TExpReturn(P^).Execute(@Self);
P := Self.gCurrentPc;
Continue;
end;
Inc(P);
end;
end;
begin
Log := ZLog.GetLog('Zc');
Log.Error('Callstack:');
DoOne(Self.gCurrentPc);
end;
procedure TExecutionEnvironment.CheckNilDeref(P : pointer);
begin
if NativeUInt(P)<=1024 then
Self.ScriptError('Null pointer referenced in expression');
end;
{$endif}
{$ifndef minimal}
procedure TExecutionEnvironment.ScriptError(const S : string);
begin
{$ifdef CALLSTACK}
LogCallstack;
{$endif}
ZHalt(S);
end;
{$endif}
function RunCode(Code : TZComponentList; Env : PExecutionEnvironment=nil) : TCodeReturnValue;
{$IFDEF ZDESIGNER}
{$DEFINE GUARD_LIMIT}
{$ENDIF}
const
NilP : pointer = nil;
var
{$ifdef GUARD_LIMIT}
GuardLimit,GuardAllocLimit : integer;
{$endif}
LocalEnv : TExecutionEnvironment;
begin
//Pc can be modified in jump-code
if Code.Count=0 then
Exit;
if Env=nil then
begin
Env := @LocalEnv;
Env.Init;
end;
Env.gCurrentPc := Code.GetPtrToItem(0);
Env.StackPushPointer(NilP); //Push return adress nil
{$ifdef GUARD_LIMIT}
GuardLimit := Round(1E8);
GuardAllocLimit := ManagedHeap_GetAllocCount + 1000000*10;
{$endif}
while True do
begin
TExpBase(Env.gCurrentPc^).Execute(Env);
if Env.gCurrentPc=nil then
Break;
Inc(Env.gCurrentPc);
{$ifdef GUARD_LIMIT}
Dec(GuardLimit);
if (GuardLimit=0) and (TThread.CurrentThread.ThreadID=MainThreadID) then
Env.ScriptError('Infinite loop?');
if ManagedHeap_GetAllocCount>GuardAllocLimit then
Env.ScriptError('Ten million strings allocated. Infinite loop?');
{$endif}
end;
if Env.StackGetDepth=1 then
Env.StackPopToPointer(Result.PointerValue);
{$ifdef ZDESIGNER}
if (Env=@LocalEnv) and (Env.StackGetDepth>0) then
ZLog.GetLog('Zc').Warning('Stack not empty on script completion');
{$endif}
end;
function CreateManagedValue(const Typ : TZcDataTypeKind) : pointer;
var
A : TDefineArray;
begin
Result := nil;
case Typ of
zctMat4:
begin
A := TDefineArray.Create(nil);
A.Dimensions := dadTwo;
A.SizeDim1 := 4;
A.SizeDim2 := 4;
A._Type.Kind := zctFloat;
Result := A;
end;
zctVec2, zctVec3, zctVec4 :
begin
A := TDefineArray.Create(nil);
A.Dimensions := dadOne;
A.SizeDim1 := 2 + Ord(Typ)-Ord(zctVec2);
A._Type.Kind := zctFloat;
Result := A;
end;
end;
ManagedHeap_AddValueObject(Result);
end;
{ TZExpression }
procedure TZExpression.DefineProperties(List: TZPropertyList);
begin
inherited;
List.AddProperty({$IFNDEF MINIMAL}'Expression',{$ENDIF}(@Expression), zptExpression);
end;
procedure TZExpression.Execute;
begin
ZExpressions.RunCode(Expression.Code);
end;
{ TExpConstantFloat }
procedure TExpConstantFloat.DefineProperties(List: TZPropertyList);
begin
inherited;
List.AddProperty({$IFNDEF MINIMAL}'Constant',{$ENDIF}(@Constant), zptFloat);
end;
procedure TExpConstantFloat.Execute(Env : PExecutionEnvironment);
begin
Env.StackPush( Constant );
end;
{$ifndef minimal}
function TExpConstantFloat.GetDisplayName: AnsiString;
begin
Result := inherited GetDisplayName + ' ' + AnsiString(FloatToStr(Constant));
end;
{$endif}
{ TExpConstantInt }
procedure TExpConstantInt.DefineProperties(List: TZPropertyList);
begin
inherited;
List.AddProperty({$IFNDEF MINIMAL}'Constant',{$ENDIF}(@Constant), zptInteger);
end;
procedure TExpConstantInt.Execute(Env : PExecutionEnvironment);
begin
Env.StackPush( Constant );
end;
{$ifndef minimal}
function TExpConstantInt.GetDisplayName: AnsiString;
begin
Result := inherited GetDisplayName + ' ' + AnsiString(IntToStr(Constant));
end;
{$endif}
{ TExpOpBinary }
procedure TExpOpBinaryBase.DefineProperties(List: TZPropertyList);
begin
inherited;
List.AddProperty({$IFNDEF MINIMAL}'Kind',{$ENDIF}(@Kind), zptByte);
end;
{$ifndef minimal}
constructor TExpOpBinaryBase.Create(OwnerList: TZComponentList; Kind : TExpOpBinaryKind);
begin
inherited Create(OwnerList);
Self.Kind := Kind;
end;
{$endif}
{$ifndef minimal}
function TExpOpBinaryBase.ExpAsText : string;
begin
Result := Copy(GetEnumName(TypeInfo(TExpOpBinaryKind),Ord(Self.Kind)),4,100) + ' (' + Copy(ComponentManager.GetInfo(Self).ZClassName,4,255) + ')';
end;
{$endif}
{$ifdef minimal} {$WARNINGS OFF} {$endif}
procedure TExpOpBinaryFloat.Execute(Env : PExecutionEnvironment);
var
A1,A2,V : single;
begin
Env.StackPopTo(A1);
Env.StackPopTo(A2);
case Kind of
vbkPlus : V := A1 + A2;
vbkMinus : V := A2 - A1;
vbkMul : V := A2 * A1;
vbkDiv : V := A2 / A1;
{$ifndef minimal}else Env.ScriptError('Invalid binary op'); {$endif}
end;
Env.StackPush(V);
end;
{$ifdef minimal} {$WARNINGS ON} {$endif}
{$ifdef minimal} {$WARNINGS OFF} {$endif}
procedure TExpOpBinaryInt.Execute(Env : PExecutionEnvironment);
var
A1,A2,V : integer;
begin
Env.StackPopTo(A1);
Env.StackPopTo(A2);
case Kind of
vbkPlus : V := A1 + A2;
vbkMinus : V := A2 - A1;
vbkMul : V := A2 * A1;
vbkDiv : V := A2 div A1;
vbkBinaryOr : V := A2 or A1;
vbkBinaryAnd : V := A2 and A1;
vbkBinaryXor : V := A2 xor A1;
vbkBinaryShiftLeft : V := A2 shl A1;
vbkBinaryShiftRight : V := A2 shr A1;
vbkMod :
if A1<>0 then
V := A2 mod A1
else
V := 0; //avoid runtime div by zero error
{$ifndef minimal}else Env.ScriptError('Invalid binary op'); {$endif}
end;
Env.StackPush(V);
end;
{$ifdef minimal} {$WARNINGS ON} {$endif}
{ TExpJump }
procedure TExpJump.DefineProperties(List: TZPropertyList);
begin
inherited;
List.AddProperty({$IFNDEF MINIMAL}'Kind',{$ENDIF}(@Kind), zptByte);
List.AddProperty({$IFNDEF MINIMAL}'Destination',{$ENDIF}(@Destination), zptInteger);
List.AddProperty({$IFNDEF MINIMAL}'Type',{$ENDIF}(@_Type), zptByte);
end;
procedure TExpJump.Execute(Env : PExecutionEnvironment);
var
L,R : single;
Li,Ri : integer;
Lp,Rp : pointer;
Jump : boolean;
begin
Jump := True;
case Kind of
jsJumpAlways : ;
else
begin
case _Type of
jutFloat:
begin
Env.StackPopTo(R);
Env.StackPopTo(L);
case Kind of
jsJumpLT : Jump := L<R;
jsJumpGT : Jump := L>R;
jsJumpLE : Jump := L<=R;
jsJumpGE : Jump := L>=R;
jsJumpNE : Jump := L<>R;
jsJumpEQ : Jump := L=R;
{$ifndef minimal}else Env.ScriptError('Invalid jump op');{$endif}