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Created: Wed, Jul 8, 7:06 AM

abstractpass.h
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	#ifndef ABSTRACTPASS_H
	#define ABSTRACTPASS_H
	#include "ast.h"
	#include "passmanager.h"

	#include<iostream>
	namespace xreate
	{
	struct PassContext
	{
	CodeScope* scope = 0;
	ManagedFnPtr function;
	ManagedRulePtr rule;
	std::string varDecl;

	PassContext()
	{}

	PassContext&& updateScope(CodeScope* scopeNew) {
	PassContext context2{*this};
	context2.scope = scopeNew;
	return std::move(context2);
	}

	~PassContext(){}
	};

	class AbstractPassBase {
	public:
	AbstractPassBase(PassManager* manager);
	virtual void run()=0;
	virtual void finish();

	PassManager* man;
	};

	template<class Output>
	Output defaultValue();

	template<>
	void defaultValue<void>();

	template<class Output>
	class SymbolCache: private std::map<Symbol, Output>{
	public:
	bool isCached(const Symbol& symbol){
	return this->count(symbol);
	}

	Output setCachedValue(const Symbol& symbol, Output&& value){
	(*this)[symbol] = value;
	return value;
	}

	Output getCachedValue(const Symbol& symbol){
	assert(this->count(symbol));
	return this->at(symbol);
	}
	};

	template<>
	class SymbolCache<void>: private std::set<Symbol>{
	public:
	bool isCached(const Symbol& symbol){
	bool result = this->count(symbol) > 0;
	return result;
	}
	void setCachedValue(const Symbol& symbol){
	this->insert(symbol);
	}

	void getCachedValue(const Symbol& symbol){
	}
	};

	template<class Output>
	class AbstractPass: public AbstractPassBase {

	SymbolCache<Output> __visitedSymbols;

	protected:
	Output processSymbol(const Symbol& symbol, PassContext context, std::string hintSymbol=""){
	if (__visitedSymbols.isCached(symbol))
	return __visitedSymbols.getCachedValue(symbol);


	const Expression& declaration = CodeScope::findDeclaration(symbol);
	if (declaration.isDefined()){
	PassContext context2 = context.updateScope(symbol.scope);

	Output&& result = process(declaration, context2, ident);
	return __visitedSymbols.setCachedValue(symbol, std::move(result));
	}

	return defaultValue<Output>();
	}

	Output processExpressionCall(const Expression& expression, PassContext context){
	const std::string &calleeName = expression.getValueString();
	std::list<ManagedFnPtr> callees = man->root->getFunctionVariants(calleeName);
	if (callees.size() == 1 && callees.front()){
	return processFnCall(callees.front(), context);

	} else {
	for (const ManagedFnPtr& callee: callees){
	processFnCallUncertain(callee, context);
	}

	return defaultValue<Output>();
	}
	}

	SymbolCache<Output>& getSymbolCache(){
	return __visitedSymbols;
	}



	public:
	AbstractPass(PassManager* manager)
	: AbstractPassBase(manager){}

	virtual Output processFnCall(ManagedFnPtr function, PassContext context){
	return defaultValue<Output>();
	}

	virtual void processFnCallUncertain(ManagedFnPtr function, PassContext context)
	{}

	virtual void process(ManagedRulePtr rule)
	{}

	virtual Output process(ManagedFnPtr function)
	{
	PassContext context;
	context.function = function;

	return process(function->getEntryScope(), context);
	}

	virtual Output process(CodeScope* scope, PassContext context, const std::string& hintBlockDecl=""){
	context.scope = scope;

	return processSymbol(Symbol{ScopedSymbol::RetSymbol, scope}, context);
	}

	virtual Output process(const Expression& expression, PassContext context, const std::string& varDecl=""){
	if (expression.__state == Expression::IDENT){
	assert(context.scope);
	return processSymbol(Attachments::get<Symbol>(expression), context, expression.getValueString());
	}

	assert(false);
	return defaultValue<Output>();
	}

	void run() {
	ManagedRulePtr rule = man->root->begin<MetaRuleAbstract>();
	while (rule.isValid()) {
	process(rule);
	++rule;
	}

	ManagedFnPtr f = man->root->begin<Function>();
	while (f.isValid()) {
	process(f);
	++f;
	}
	}

	private:

	template<>
	void
	AbstractPass<void>::processSymbol(const Symbol& symbol, PassContext context);

	}
	#endif

	//PROCESS FUNCTION:
	// const Symbol& symbolFunction{0, function->getEntryScope()};
	//
	// if (__visitedSymbols.isCached(symbolFunction))
	// return __visitedSymbols.getCachedValue(symbolFunction);
	//
	// PassContext context;
	// context.function = function;
	//
	// Output&& result = process(function->getEntryScope(), context);
	// return __visitedSymbols.setCachedValue(symbolFunction, std::move(result));

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