6 files changed, 421 insertions, 1 deletions

diff --git a/libjulia/AsmDataForward.h b/libjulia/ASTDataForward.h
index 3806e321..3806e321 100644
--- a/libjulia/AsmDataForward.h
+++ b/libjulia/ASTDataForward.h
diff --git a/libjulia/backends/evm/EVMCodeTransform.h b/libjulia/backends/evm/EVMCodeTransform.h
index e4cb20ed..577cc8ba 100644
--- a/libjulia/backends/evm/EVMCodeTransform.h
+++ b/libjulia/backends/evm/EVMCodeTransform.h
@@ -20,7 +20,7 @@
 
 #include <libjulia/backends/evm/EVMAssembly.h>
 
-#include <libjulia/AsmDataForward.h>
+#include <libjulia/ASTDataForward.h>
 
 #include <libsolidity/inlineasm/AsmScope.h>
 
diff --git a/libjulia/optimiser/ASTCopier.cpp b/libjulia/optimiser/ASTCopier.cpp
new file mode 100644
index 00000000..d777d731
--- /dev/null
+++ b/libjulia/optimiser/ASTCopier.cpp
@@ -0,0 +1,174 @@
+/*
+	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/>.
+*/
+/**
+ * Creates an independent copy of an AST, renaming identifiers to be unique.
+ */
+
+#include <libjulia/optimiser/ASTCopier.h>
+
+#include <libsolidity/inlineasm/AsmData.h>
+
+#include <libsolidity/interface/Exceptions.h>
+
+#include <libdevcore/Common.h>
+
+using namespace std;
+using namespace dev;
+using namespace dev::julia;
+
+
+Statement ASTCopier::operator()(Instruction const& _instruction)
+{
+	return _instruction;
+}
+
+Statement ASTCopier::operator()(VariableDeclaration const& _varDecl)
+{
+	return VariableDeclaration{
+		_varDecl.location,
+		translateVector(_varDecl.variables),
+		translate(_varDecl.value)
+	};
+}
+
+Statement ASTCopier::operator()(Assignment const& _assignment)
+{
+	return Assignment{
+		_assignment.location,
+		translateVector(_assignment.variableNames),
+		translate(_assignment.value)
+	};
+}
+
+Statement ASTCopier::operator()(StackAssignment const&)
+{
+	solAssert(false, "Invalid operation.");
+	return {};
+}
+
+Statement ASTCopier::operator()(Label const&)
+{
+	solAssert(false, "Invalid operation.");
+	return {};
+}
+
+Statement ASTCopier::operator()(FunctionCall const& _call)
+{
+	return FunctionCall{
+		_call.location,
+		translate(_call.functionName),
+		translateVector(_call.arguments)
+	};
+}
+
+Statement ASTCopier::operator()(FunctionalInstruction const& _instruction)
+{
+	return FunctionalInstruction{
+		_instruction.location,
+		_instruction.instruction,
+		translateVector(_instruction.arguments)
+	};
+}
+
+Statement ASTCopier::operator()(Identifier const& _identifier)
+{
+	return Identifier{_identifier.location, translateIdentifier(_identifier.name)};
+}
+
+Statement ASTCopier::operator()(Literal const& _literal)
+{
+	return translate(_literal);
+}
+
+Statement ASTCopier::operator()(If const& _if)
+{
+	return If{_if.location, translate(_if.condition), translate(_if.body)};
+}
+
+Statement ASTCopier::operator()(Switch const& _switch)
+{
+	return Switch{_switch.location, translate(_switch.expression), translateVector(_switch.cases)};
+}
+
+Statement ASTCopier::operator()(FunctionDefinition const& _function)
+{
+	string translatedName = translateIdentifier(_function.name);
+
+	enterFunction(_function);
+	ScopeGuard g([&]() { this->leaveFunction(_function); });
+
+	return FunctionDefinition{
+		_function.location,
+		move(translatedName),
+		translateVector(_function.parameters),
+		translateVector(_function.returnVariables),
+		translate(_function.body)
+	};
+}
+
+Statement ASTCopier::operator()(ForLoop const& _forLoop)
+{
+	enterScope(_forLoop.pre);
+	ScopeGuard g([&]() { this->leaveScope(_forLoop.pre); });
+
+	return ForLoop{
+		_forLoop.location,
+		translate(_forLoop.pre),
+		translate(_forLoop.condition),
+		translate(_forLoop.post),
+		translate(_forLoop.body)
+	};
+}
+
+Statement ASTCopier::operator ()(Block const& _block)
+{
+	return translate(_block);
+}
+
+Statement ASTCopier::translate(Statement const& _statement)
+{
+	return boost::apply_visitor(*this, _statement);
+}
+
+Block ASTCopier::translate(Block const& _block)
+{
+	enterScope(_block);
+	ScopeGuard g([&]() { this->leaveScope(_block); });
+
+	return Block{_block.location, translateVector(_block.statements)};
+}
+
+Case ASTCopier::translate(Case const& _case)
+{
+	return Case{_case.location, translate(_case.value), translate(_case.body)};
+}
+
+Identifier ASTCopier::translate(Identifier const& _identifier)
+{
+	return Identifier{_identifier.location, translateIdentifier(_identifier.name)};
+}
+
+Literal ASTCopier::translate(Literal const& _literal)
+{
+	return _literal;
+}
+
+TypedName ASTCopier::translate(TypedName const& _typedName)
+{
+	return TypedName{_typedName.location, translateIdentifier(_typedName.name), _typedName.type};
+}
+
diff --git a/libjulia/optimiser/ASTCopier.h b/libjulia/optimiser/ASTCopier.h
new file mode 100644
index 00000000..0658fd50
--- /dev/null
+++ b/libjulia/optimiser/ASTCopier.h
@@ -0,0 +1,93 @@
+/*
+	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/>.
+*/
+/**
+ * Creates an independent copy of an AST, renaming identifiers to be unique.
+ */
+
+#pragma once
+
+#include <libjulia/ASTDataForward.h>
+
+#include <boost/variant.hpp>
+#include <boost/optional.hpp>
+
+#include <vector>
+#include <set>
+#include <memory>
+
+namespace dev
+{
+namespace julia
+{
+
+/**
+ * Creates a copy of a iulia AST potentially replacing identifier names.
+ * Base class to be extended.
+ */
+class ASTCopier: public boost::static_visitor<Statement>
+{
+public:
+	Statement operator()(Literal const& _literal);
+	Statement operator()(Instruction const& _instruction);
+	Statement operator()(Identifier const& _identifier);
+	Statement operator()(FunctionalInstruction const& _instr);
+	Statement operator()(FunctionCall const&);
+	Statement operator()(Label const& _label);
+	Statement operator()(StackAssignment const& _assignment);
+	Statement operator()(Assignment const& _assignment);
+	Statement operator()(VariableDeclaration const& _varDecl);
+	Statement operator()(If const& _if);
+	Statement operator()(Switch const& _switch);
+	Statement operator()(FunctionDefinition const&);
+	Statement operator()(ForLoop const&);
+	Statement operator()(Block const& _block);
+
+protected:
+	template <typename T>
+	std::vector<T> translateVector(std::vector<T> const& _values);
+
+	template <typename T>
+	std::shared_ptr<T> translate(std::shared_ptr<T> const& _v)
+	{
+		return _v ? std::make_shared<T>(translate(*_v)) : nullptr;
+	}
+	Statement translate(Statement const& _statement);
+	Block translate(Block const& _block);
+	Case translate(Case const& _case);
+	Identifier translate(Identifier const& _identifier);
+	Literal translate(Literal const& _literal);
+	TypedName translate(TypedName const& _typedName);
+
+	virtual void enterScope(Block const&) { }
+	virtual void leaveScope(Block const&) { }
+	virtual void enterFunction(FunctionDefinition const&) { }
+	virtual void leaveFunction(FunctionDefinition const&) { }
+	virtual std::string translateIdentifier(std::string const& _name) { return _name; }
+};
+
+template <typename T>
+std::vector<T> ASTCopier::translateVector(std::vector<T> const& _values)
+{
+	std::vector<T> translated;
+	for (auto const& v: _values)
+		translated.emplace_back(translate(v));
+	return translated;
+}
+
+
+}
+}
diff --git a/libjulia/optimiser/Disambiguator.cpp b/libjulia/optimiser/Disambiguator.cpp
new file mode 100644
index 00000000..df2984e5
--- /dev/null
+++ b/libjulia/optimiser/Disambiguator.cpp
@@ -0,0 +1,85 @@
+/*
+	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/>.
+*/
+/**
+ * Optimiser component that makes all identifiers unique.
+ */
+
+#include <libjulia/optimiser/Disambiguator.h>
+
+#include <libsolidity/inlineasm/AsmData.h>
+#include <libsolidity/inlineasm/AsmScope.h>
+
+#include <libsolidity/interface/Exceptions.h>
+
+using namespace std;
+using namespace dev;
+using namespace dev::julia;
+using namespace dev::solidity;
+
+using Scope = dev::solidity::assembly::Scope;
+
+string Disambiguator::translateIdentifier(string const& _originalName)
+{
+	solAssert(!m_scopes.empty() && m_scopes.back(), "");
+	Scope::Identifier const* id = m_scopes.back()->lookup(_originalName);
+	solAssert(id, "");
+	if (!m_translations.count(id))
+	{
+		string translated = _originalName;
+		size_t suffix = 0;
+		while (m_usedNames.count(translated))
+		{
+			suffix++;
+			translated = _originalName + "_" + std::to_string(suffix);
+		}
+		m_usedNames.insert(translated);
+		m_translations[id] = translated;
+	}
+	return m_translations.at(id);
+}
+
+void Disambiguator::enterScope(Block const& _block)
+{
+	enterScopeInternal(*m_info.scopes.at(&_block));
+}
+
+void Disambiguator::leaveScope(Block const& _block)
+{
+	leaveScopeInternal(*m_info.scopes.at(&_block));
+}
+
+void Disambiguator::enterFunction(FunctionDefinition const& _function)
+{
+	enterScopeInternal(*m_info.scopes.at(m_info.virtualBlocks.at(&_function).get()));
+}
+
+void Disambiguator::leaveFunction(FunctionDefinition const& _function)
+{
+	leaveScopeInternal(*m_info.scopes.at(m_info.virtualBlocks.at(&_function).get()));
+}
+
+void Disambiguator::enterScopeInternal(Scope& _scope)
+{
+	m_scopes.push_back(&_scope);
+}
+
+void Disambiguator::leaveScopeInternal(Scope& _scope)
+{
+	solAssert(!m_scopes.empty(), "");
+	solAssert(m_scopes.back() == &_scope, "");
+	m_scopes.pop_back();
+}
diff --git a/libjulia/optimiser/Disambiguator.h b/libjulia/optimiser/Disambiguator.h
new file mode 100644
index 00000000..cc9488d5
--- /dev/null
+++ b/libjulia/optimiser/Disambiguator.h
@@ -0,0 +1,68 @@
+/*
+	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/>.
+*/
+/**
+ * Optimiser component that makes all identifiers unique.
+ */
+
+#pragma once
+
+#include <libjulia/ASTDataForward.h>
+
+#include <libjulia/optimiser/ASTCopier.h>
+
+#include <libsolidity/inlineasm/AsmAnalysisInfo.h>
+
+#include <boost/variant.hpp>
+#include <boost/optional.hpp>
+
+#include <set>
+
+namespace dev
+{
+namespace julia
+{
+class EVMAssembly;
+
+/**
+ * Creates a copy of a iulia AST replacing all identifiers by unique names.
+ */
+class Disambiguator: public ASTCopier
+{
+public:
+	Disambiguator(solidity::assembly::AsmAnalysisInfo const& _analysisInfo):
+		m_info(_analysisInfo)
+	{}
+
+protected:
+	virtual void enterScope(Block const& _block) override;
+	virtual void leaveScope(Block const& _block) override;
+	virtual void enterFunction(FunctionDefinition const& _function) override;
+	virtual void leaveFunction(FunctionDefinition const& _function) override;
+	virtual std::string translateIdentifier(std::string const& _name) override;
+
+	void enterScopeInternal(solidity::assembly::Scope& _scope);
+	void leaveScopeInternal(solidity::assembly::Scope& _scope);
+
+	solidity::assembly::AsmAnalysisInfo const& m_info;
+
+	std::vector<solidity::assembly::Scope*> m_scopes;
+	std::map<void const*, std::string> m_translations;
+	std::set<std::string> m_usedNames;
+};
+
+}
+}