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Created: Wed, Jul 8, 9:48 PM

transformations.cpp
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	/*
	* File: Transformations.cpp
	* Author: pgess
	*
	* Created on June 18, 2016, 6:23 PM
	*/

	#include "compilation/transformations.h"
	#include "pass/compilepass.h"
	#include "llvmlayer.h"
	#include <llvm/IR/Value.h>

	using namespace llvm;

	namespace xreate { namespace compilation {

	Transformations::Transformations(CompilePass* passCompilation): pass(passCompilation) {
	}

	void
	Transformations::subscribe(const std::string& annotation, int handler){
	__subscriptions.emplace(annotation, handler);
	}

	bool
	Transformations::isAcceptable(const Expression& expression){
	//check subscription based on expression attachments
	if (Attachments::get<Expression, Transformations>(expression, {false, 0}).flagSubscribed){
	return true;
	}

	//subscription based on expression annotations;
	if (expression.tags.size() == 0) return false;

	for (auto tag: expression.tags) {
	if (__subscriptions.count(tag.first)){
	return true;
	}
	}

	return false;
	}

	Expression
	Transformations::transform(const Expression& expression, const Context& ctx){
	Expression result = expression;

	for (auto handler: getAppropriateTransformers(expression)){
	result = handler->transform(result, ctx);
	}

	return result;
	}

	llvm::Value*
	Transformations::transform(const Expression& expression, llvm::Value* raw, const Context& ctx){
	for (auto handler: getAppropriateTransformers(expression)){
	raw = handler->transform(expression, raw, ctx);
	}

	return raw;
	}

	std::list<Transformer*>
	Transformations::getAppropriateTransformers(const Expression& expression){

	std::list<Transformer*> result;

	for (auto tag: expression.tags) {
	if (__subscriptions.count(tag.first)){
	auto handlers = __subscriptions.equal_range(tag.first);

	for (auto handlerIt=handlers.first; handlerIt!= handlers.second; ++handlerIt){
	Transformer* handler = __transformers[handlerIt->second];

	if (handler->isAcceptable(expression)){
	result.push_back(handler);
	}
	}
	}
	}

	auto subscriberInternal = Attachments::get<Expression, Transformations>(expression, {false, 0});
	if (subscriberInternal.flagSubscribed){
	result.push_back(__transformers[subscriberInternal.subscriberId]);
	}

	return result;
	}

	TransformerSaturation::TransformerSaturation(Transformations* man)
	: __man(man) {

	man->subscribe("break", TransformerInfo<TransformerSaturation>::id);
	}

	bool
	TransformerSaturation::isAcceptable(const Expression& expression){
	return true;
	}

	bool
	TransformerSaturation::exists() const{
	return __block != nullptr;
	}

	llvm::Value*
	TransformerSaturation::transform(const Expression& expression, llvm::Value* raw, const Context& ctx){
	__block = __man->pass->man->llvm->builder.GetInsertBlock();

	return raw;
	}

	llvm::BasicBlock*
	TransformerSaturation::getBlock() const{
	return __block;
	}

	void
	TransformerSaturation::inject(llvm::BasicBlock* blockAllocation, llvm::BasicBlock* blockExit, compilation::Context context){
	llvm::Type* tyInt1 = llvm::Type::getInt1Ty(llvm::getGlobalContext());
	llvm::Value* valueConstOne = llvm::ConstantInt::get(tyInt1, 1);
	llvm::Value* valueConstFalse = llvm::ConstantInt::get(tyInt1, 0);

	//allocation of saturation flag
	IRBuilder<> builderAlloca(blockAllocation, blockAllocation->getFirstInsertionPt());
	llvm::Value* flagSaturation = builderAlloca.CreateAlloca(tyInt1, valueConstOne, "flagSaturation");
	builderAlloca.CreateStore(valueConstFalse, flagSaturation, true);

	//set up saturation flag
	llvm::BasicBlock* blockSaturation = __block;
	IRBuilder<> builderSaturation(blockSaturation, blockSaturation->getFirstInsertionPt());
	builderSaturation.CreateStore(valueConstOne, flagSaturation, true);

	//check saturation flag:
	//TODO remove blockContinue, receive from caller block to continue.
	llvm::BasicBlock *blockContinue = llvm::BasicBlock::Create(llvm::getGlobalContext(), "continue", context.function->raw);
	context.pass->man->llvm->builder.CreateCondBr(context.pass->man->llvm->builder.CreateLoad(flagSaturation), blockExit, blockContinue);

	context.pass->man->llvm->builder.SetInsertPoint(blockContinue);
	}

	}}

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