Analysis refactoring.

1 files changed, 179 insertions, 0 deletions

diff --git a/libsolidity/inlineasm/AsmAnalysis.cpp b/libsolidity/inlineasm/AsmAnalysis.cpp
new file mode 100644
index 00000000..ef620b84
--- /dev/null
+++ b/libsolidity/inlineasm/AsmAnalysis.cpp
@@ -0,0 +1,179 @@
+/*
+	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/>.
+*/
+/**
+ * Analyzer part of inline assembly.
+ */
+
+#include <libsolidity/inlineasm/AsmAnalysis.h>
+
+#include <libsolidity/inlineasm/AsmData.h>
+
+#include <libsolidity/interface/Exceptions.h>
+#include <libsolidity/interface/Utils.h>
+
+#include <boost/range/adaptor/reversed.hpp>
+
+#include <memory>
+#include <functional>
+
+using namespace std;
+using namespace dev;
+using namespace dev::solidity;
+using namespace dev::solidity::assembly;
+
+
+bool Scope::registerLabel(const string& _name, size_t _id)
+{
+	if (lookup(_name))
+		return false;
+	identifiers[_name] = Scope::Label(_id);
+	return true;
+}
+
+
+bool Scope::registerVariable(const string& _name)
+{
+	if (lookup(_name))
+		return false;
+	identifiers[_name] = Variable();
+	return true;
+}
+
+Scope::Identifier* Scope::lookup(string const& _name)
+{
+	if (identifiers.count(_name))
+		return &identifiers[_name];
+	else if (superScope)
+		return superScope->lookup(_name);
+	else
+		return nullptr;
+}
+
+AsmAnalyzer::AsmAnalyzer(AsmAnalyzer::Scopes& _scopes, ErrorList& _errors):
+	m_scopes(_scopes), m_errors(_errors)
+{
+	// Make the Solidity ErrorTag available to inline assembly
+	m_scopes[nullptr] = make_shared<Scope>();
+	m_scopes[nullptr]->identifiers["invalidJumpLabel"] = Scope::Label(Scope::Label::errorLabelId);
+	m_currentScope = m_scopes[nullptr].get();
+}
+
+bool AsmAnalyzer::operator()(assembly::Literal const& _literal)
+{
+	if (!_literal.isNumber && _literal.value.size() > 32)
+	{
+		m_errors.push_back(make_shared<Error>(
+			Error::Type::TypeError,
+			"string literal too long (" + boost::lexical_cast<std::string>(_literal.value.size()) + " > 32)"
+		));
+		return false;
+	}
+	return true;
+}
+
+bool AsmAnalyzer::operator()(FunctionalInstruction const& _instr)
+{
+	bool success = true;
+	for (auto const& arg: _instr.arguments | boost::adaptors::reversed)
+		if (!boost::apply_visitor(*this, arg))
+			success = false;
+	if (!(*this)(_instr.instruction))
+		success = false;
+	return success;
+}
+
+bool AsmAnalyzer::operator()(Label const& _item)
+{
+	if (!m_currentScope->registerLabel(_item.name, Scope::Label::unassignedLabelId))
+	{
+		//@TODO secondary location
+		m_errors.push_back(make_shared<Error>(
+			Error::Type::DeclarationError,
+			"Label name " + _item.name + " already taken in this scope.",
+			_item.location
+		));
+		return false;
+	}
+	bool success = true;
+	if (!_item.stackInfo.empty())
+	{
+		Scope::Label& label = boost::get<Scope::Label>(m_currentScope->identifiers[_item.name]);
+		if (_item.stackInfo.size() == 1)
+			try
+			{
+				label.stackAdjustment = boost::lexical_cast<int>(_item.stackInfo[0]);
+				label.resetStackHeight = false;
+				return true;
+			}
+			catch (boost::bad_lexical_cast const&)
+			{
+				// Interpret as variable name
+			}
+		label.resetStackHeight = true;
+		for (auto const& stackItem: _item.stackInfo)
+		{
+			if (!m_currentScope->registerVariable(stackItem))
+			{
+				//@TODO secondary location
+				m_errors.push_back(make_shared<Error>(
+					Error::Type::DeclarationError,
+					"Variable name " + stackItem + " already taken in this scope.",
+					_item.location
+				));
+				success = false;
+			}
+		}
+	}
+	return success;
+}
+
+bool AsmAnalyzer::operator()(const FunctionalAssignment& _assignment)
+{
+	return boost::apply_visitor(*this, *_assignment.value);
+}
+
+bool AsmAnalyzer::operator()(assembly::VariableDeclaration const& _varDecl)
+{
+	bool success = boost::apply_visitor(*this, *_varDecl.value);
+	if (!m_currentScope->registerVariable(_varDecl.name))
+	{
+		//@TODO secondary location
+		m_errors.push_back(make_shared<Error>(
+			Error::Type::DeclarationError,
+			"Variable name " + _varDecl.name + " already taken in this scope.",
+			_varDecl.location
+		));
+		success = false;
+	}
+	return success;
+}
+
+bool AsmAnalyzer::operator()(Block const& _block)
+{
+	bool success = true;
+	auto scope = make_shared<Scope>();
+	scope->superScope = m_currentScope;
+	m_scopes[&_block] = scope;
+	m_currentScope = scope.get();
+
+	for (auto const& s: _block.statements)
+		if (!boost::apply_visitor(*this, s))
+			success = false;
+
+	m_currentScope = m_currentScope->superScope;
+	return success;
+}