Merge pull request #5571 from ethereum/develop

Version 0.5.1

1 files changed, 122 insertions, 0 deletions

diff --git a/libyul/AsmAnalysis.h b/libyul/AsmAnalysis.h
new file mode 100644
index 00000000..34e32eb0
--- /dev/null
+++ b/libyul/AsmAnalysis.h
@@ -0,0 +1,122 @@
+/*
+	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 <liblangutil/Exceptions.h>
+#include <liblangutil/EVMVersion.h>
+
+#include <libyul/AsmScope.h>
+
+#include <libyul/backends/evm/AbstractAssembly.h>
+
+#include <libyul/AsmDataForward.h>
+
+#include <boost/variant.hpp>
+#include <boost/optional.hpp>
+
+#include <functional>
+#include <memory>
+
+namespace langutil
+{
+class ErrorReporter;
+struct SourceLocation;
+}
+
+namespace yul
+{
+
+struct AsmAnalysisInfo;
+
+/**
+ * Performs the full analysis stage, calls the ScopeFiller internally, then resolves
+ * references and performs other checks.
+ * If all these checks pass, code generation should not throw errors.
+ */
+class AsmAnalyzer: public boost::static_visitor<bool>
+{
+public:
+	explicit AsmAnalyzer(
+		AsmAnalysisInfo& _analysisInfo,
+		langutil::ErrorReporter& _errorReporter,
+		dev::solidity::EVMVersion _evmVersion,
+		boost::optional<langutil::Error::Type> _errorTypeForLoose,
+		AsmFlavour _flavour = AsmFlavour::Loose,
+		ExternalIdentifierAccess::Resolver const& _resolver = ExternalIdentifierAccess::Resolver()
+	):
+		m_resolver(_resolver),
+		m_info(_analysisInfo),
+		m_errorReporter(_errorReporter),
+		m_evmVersion(_evmVersion),
+		m_flavour(_flavour),
+		m_errorTypeForLoose(_errorTypeForLoose)
+	{}
+
+	bool analyze(Block const& _block);
+
+	bool operator()(Instruction const&);
+	bool operator()(Literal const& _literal);
+	bool operator()(Identifier const&);
+	bool operator()(FunctionalInstruction const& _functionalInstruction);
+	bool operator()(Label const& _label);
+	bool operator()(ExpressionStatement const&);
+	bool operator()(StackAssignment const&);
+	bool operator()(Assignment const& _assignment);
+	bool operator()(VariableDeclaration const& _variableDeclaration);
+	bool operator()(FunctionDefinition const& _functionDefinition);
+	bool operator()(FunctionCall const& _functionCall);
+	bool operator()(If const& _if);
+	bool operator()(Switch const& _switch);
+	bool operator()(ForLoop const& _forLoop);
+	bool operator()(Block const& _block);
+
+private:
+	/// Visits the statement and expects it to deposit one item onto the stack.
+	bool expectExpression(Expression const& _expr);
+	bool expectDeposit(int _deposit, int _oldHeight, langutil::SourceLocation const& _location);
+
+	/// Verifies that a variable to be assigned to exists and has the same size
+	/// as the value, @a _valueSize, unless that is equal to -1.
+	bool checkAssignment(Identifier const& _assignment, size_t _valueSize = size_t(-1));
+
+	Scope& scope(Block const* _block);
+	void expectValidType(std::string const& type, langutil::SourceLocation const& _location);
+	void warnOnInstructions(dev::solidity::Instruction _instr, langutil::SourceLocation const& _location);
+
+	/// Depending on @a m_flavour and @a m_errorTypeForLoose, throws an internal compiler
+	/// exception (if the flavour is not Loose), reports an error/warning
+	/// (if m_errorTypeForLoose is set) or does nothing.
+	void checkLooseFeature(langutil::SourceLocation const& _location, std::string const& _description);
+
+	int m_stackHeight = 0;
+	yul::ExternalIdentifierAccess::Resolver m_resolver;
+	Scope* m_currentScope = nullptr;
+	/// Variables that are active at the current point in assembly (as opposed to
+	/// "part of the scope but not yet declared")
+	std::set<Scope::Variable const*> m_activeVariables;
+	AsmAnalysisInfo& m_info;
+	langutil::ErrorReporter& m_errorReporter;
+	dev::solidity::EVMVersion m_evmVersion;
+	AsmFlavour m_flavour = AsmFlavour::Loose;
+	boost::optional<langutil::Error::Type> m_errorTypeForLoose;
+};
+
+}