1 files changed, 152 insertions, 0 deletions
diff --git a/libsolidity/inlineasm/AsmAnalysis.h b/libsolidity/inlineasm/AsmAnalysis.h
new file mode 100644
index 00000000..6b79ca67
--- /dev/null
+++ b/libsolidity/inlineasm/AsmAnalysis.h
@@ -0,0 +1,152 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * Analysis part of inline assembly.
+ */
+
+#pragma once
+
+#include <libsolidity/interface/Exceptions.h>
+
+#include <boost/variant.hpp>
+
+#include <functional>
+#include <memory>
+
+namespace dev
+{
+namespace solidity
+{
+namespace assembly
+{
+
+struct Literal;
+struct Block;
+struct Label;
+struct FunctionalInstruction;
+struct FunctionalAssignment;
+struct VariableDeclaration;
+struct Instruction;
+struct Identifier;
+struct Assignment;
+
+struct Scope
+{
+	struct Variable
+	{
+		int stackHeight = 0;
+		bool active = false;
+	};
+
+	struct Label
+	{
+		Label(size_t _id): id(_id) {}
+		size_t id = 0;
+		int stackAdjustment = 0;
+		bool resetStackHeight = false;
+		static const size_t errorLabelId = -1;
+		static const size_t unassignedLabelId = 0;
+	};
+
+	using Identifier = boost::variant<Variable, Label>;
+
+	struct Visitor: public boost::static_visitor<>
+	{
+		Visitor(
+			std::function<void(Variable const&)> _varVisitor,
+			std::function<void(Label const&)> _labelVisitor
+		):
+			m_varVisitor(std::move(_varVisitor)),
+			m_labelVisitor(std::move(_labelVisitor))
+		{}
+
+		void operator()(Variable const& _var) const { m_varVisitor(_var); }
+		void operator()(Label const& _label) const { m_labelVisitor(_label); }
+
+		std::function<void(Variable const&)> m_varVisitor;
+		std::function<void(Label const&)> m_labelVisitor;
+	};
+	struct NonconstVisitor: public boost::static_visitor<>
+	{
+		NonconstVisitor(
+			std::function<void(Variable&)> _varVisitor,
+			std::function<void(Label&)> _labelVisitor
+		):
+			m_varVisitor(std::move(_varVisitor)),
+			m_labelVisitor(std::move(_labelVisitor))
+		{}
+
+		void operator()(Variable& _var) const { m_varVisitor(_var); }
+		void operator()(Label& _label) const { m_labelVisitor(_label); }
+
+		std::function<void(Variable&)> m_varVisitor;
+		std::function<void(Label&)> m_labelVisitor;
+	};
+
+	bool registerLabel(std::string const& _name, size_t _id);
+
+	bool registerVariable(std::string const& _name);
+
+	/// Looks up the identifier in this or super scopes and returns a valid pointer if
+	/// found or a nullptr if not found.
+	/// The pointer will be invalidated if the scope is modified.
+	Identifier* lookup(std::string const& _name);
+	/// Looks up the identifier in this and super scopes and calls the visitor, returns false if not found.
+	template <class V>
+	bool lookup(std::string const& _name, V const& _visitor)
+	{
+		if (Identifier* id = lookup(_name))
+		{
+			boost::apply_visitor(_visitor, *id);
+			return true;
+		}
+		else
+			return false;
+	}
+
+
+
+	Scope* superScope = nullptr;
+	std::map<std::string, Identifier> identifiers;
+};
+
+
+class AsmAnalyzer: public boost::static_visitor<bool>
+{
+public:
+	using Scopes = std::map<assembly::Block const*, std::shared_ptr<Scope>>;
+	AsmAnalyzer(Scopes& _scopes, ErrorList& _errors);
+
+	bool operator()(assembly::Instruction const&) { return true; }
+	bool operator()(assembly::Literal const& _literal);
+	bool operator()(assembly::Identifier const&) { return true; }
+	bool operator()(assembly::FunctionalInstruction const& _functionalInstruction);
+	bool operator()(assembly::Label const& _label);
+	bool operator()(assembly::Assignment const&) { return true; }
+	bool operator()(assembly::FunctionalAssignment const& _functionalAssignment);
+	bool operator()(assembly::VariableDeclaration const& _variableDeclaration);
+	bool operator()(assembly::Block const& _block);
+
+private:
+	Scope* m_currentScope = nullptr;
+	Scopes& m_scopes;
+	ErrorList& m_errors;
+};
+
+}
+}
+}