ExternLayer.h
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	//
	// Created by pgess on 4/21/15.
	//

	#ifndef XREATE_EXTERNLAYER_H
	#define XREATE_EXTERNLAYER_H

	#include "llvmlayer.h"
	#include <vector>
	#include <string>
	#include <map>
	#include "ast.h"
	#include "clang/AST/ASTContext.h"
	#include "clang/Frontend/ASTUnit.h"
	#include "clang/Frontend/CodeGenOptions.h"
	#include "clang/CodeGen/CodeGenABITypes.h"

	namespace xreate {
	struct ExternData {
	void addLibrary(Atom<Identifier_t>&& name, Atom<String_t>&& package);
	void addIncludeDecl(Expression&& e);

	std::vector<ExternEntry> entries;
	std::map<std::string, std::string> __dictLibraries;
	};

	class ExternLayer {
	public:
	ExternLayer(LLVMLayer* llvm);

	llvm::Function* lookupFunction(const std::string& name);
	clang::QualType lookupType(const std::string& id);
	std::vector<std::string> getStructFields(const clang::QualType& ty);

	llvm::Type* toLLVMType(const clang::QualType& t);
	bool isPointer(const clang::QualType& t);

	void init(const AST* root);
	static std::vector<std::string> fetchPackageFlags(const ExternEntry& entry);
	static std::vector<std::string> fetchPackageLibs(const ExternEntry& entry);
	private:

	std::unique_ptr<clang::ASTUnit> ast;
	std::unique_ptr<clang::CodeGen::CodeGenModule> __cgm;
	std::unique_ptr<clang::CodeGenOptions> __cgo;
	LLVMLayer* __llvm;
	std::vector<ExternEntry> entries;
	std::map<std::string, llvm::Function*> __functions;

	void addExternalData(const std::vector<ExternEntry>& data);
	void loadLibraries(std::vector<std::string>&& libs);
	};
	}
	#endif //XREATE_EXTERNLAYER_H