Relative paths in import directives.

libsolidity/ast/AST.cpp

@@ -56,6 +56,13 @@ Error ASTNode::createTypeError(string const& _description) const
 	return Error(Error::Type::TypeError) << errinfo_sourceLocation(location()) << errinfo_comment(_description);
 }
 
+ImportAnnotation& ImportDirective::annotation() const
+{
+	if (!m_annotation)
+		m_annotation = new ImportAnnotation();
+	return static_cast<ImportAnnotation&>(*m_annotation);
+}
+
 map<FixedHash<4>, FunctionTypePointer> ContractDefinition::interfaceFunctions() const
 {
 	auto exportedFunctionList = interfaceFunctionList();

libsolidity/ast/AST.h

@@ -142,6 +142,7 @@ public:
 	virtual void accept(ASTConstVisitor& _visitor) const override;
 
 	ASTString const& identifier() const { return *m_identifier; }
+	virtual ImportAnnotation& annotation() const override;
 
 private:
 	ASTPointer<ASTString> m_identifier;

libsolidity/ast/ASTAnnotations.h

@@ -54,6 +54,12 @@ struct DocumentedAnnotation
 	std::multimap<std::string, DocTag> docTags;
 };
 
+struct ImportAnnotation: ASTAnnotation
+{
+	/// The absolute path of the source unit to import.
+	std::string absolutePath;
+};
+
 struct TypeDeclarationAnnotation: ASTAnnotation
 {
 	/// The name of this type, prefixed by proper namespaces if globally accessible.