protected void AssignStacksFromFrame() {
_floatStack = (floatStack) _floatFrameStack.top();
_intStack = (intStack) _intFrameStack.top();
_boolStack = (booleanStack) _boolFrameStack.top();
_codeStack = (ObjectStack) _codeFrameStack.top();
_nameStack = (ObjectStack) _nameFrameStack.top();
}
public void PopStacks() {
_floatFrameStack.pop();
_intFrameStack.pop();
_boolFrameStack.pop();
_codeFrameStack.pop();
_nameFrameStack.pop();
AssignStacksFromFrame();
}
public void PushStacks() {
_floatFrameStack.push(new floatStack());
_intFrameStack.push(new intStack());
_boolFrameStack.push(new booleanStack());
_codeFrameStack.push(new ObjectStack());
_nameFrameStack.push(new ObjectStack());
AssignStacksFromFrame();
}
/**
* Steps a Push interpreter forward with a given instruction limit.
*
* <p>This method assumes that the intepreter is already setup with an active program (typically
* using \ref Execute).
*
* @param inMaxSteps The maximum number of instructions allowed to be executed.
* @return The number of instructions executed.
*/
public int Step(int inMaxSteps) {
int executed = 0;
while (inMaxSteps != 0 && _execStack.size() > 0) {
ExecuteInstruction(_execStack.pop());
inMaxSteps--;
executed++;
}
_totalStepsTaken += executed;
return executed;
}
/** Resets the Push interpreter state by clearing all of the stacks. */
public void ClearStacks() {
_intStack.clear();
_floatStack.clear();
_execStack.clear();
_nameStack.clear();
_boolStack.clear();
_codeStack.clear();
_inputStack.clear();
// Clear all custom stacks
for (Stack s : _customStacks) {
s.clear();
}
}
public int ExecuteInstruction(Object inObject) {
if (inObject instanceof Program) {
Program p = (Program) inObject;
if (_useFrames) {
_execStack.push("frame.pop");
}
p.PushAllReverse(_execStack);
if (_useFrames) {
_execStack.push("frame.push");
}
return 0;
}
if (inObject instanceof Integer) {
_intStack.push((Integer) inObject);
return 0;
}
if (inObject instanceof Number) {
_floatStack.push(((Number) inObject).floatValue());
return 0;
}
if (inObject instanceof Instruction) {
((Instruction) inObject).Execute(this);
return 0;
}
if (inObject instanceof String) {
Instruction i = _instructions.get(inObject);
if (i != null) {
i.Execute(this);
} else {
_nameStack.push(inObject);
}
return 0;
}
return -1;
}
public void PopFrame() {
if (_useFrames) {
boolean boolTop = _boolStack.top();
int intTop = _intStack.top();
float floatTop = _floatStack.top();
Object nameTop = _nameStack.top();
Object codeTop = _codeStack.top();
PopStacks();
_floatStack.push(floatTop);
_intStack.push(intTop);
_boolStack.push(boolTop);
if (nameTop != null) _nameStack.push(nameTop);
if (codeTop != null) _codeStack.push(codeTop);
}
}
/**
* Loads a Push program into the interpreter's exec and code stacks.
*
* @param inProgram The program to load.
*/
public void LoadProgram(Program inProgram) {
_codeStack.push(inProgram);
_execStack.push(inProgram);
}