Assembly printer.

4 files changed, 204 insertions, 4 deletions

diff --git a/libsolidity/inlineasm/AsmPrinter.cpp b/libsolidity/inlineasm/AsmPrinter.cpp
new file mode 100644
index 00000000..d829a416
--- /dev/null
+++ b/libsolidity/inlineasm/AsmPrinter.cpp
@@ -0,0 +1,125 @@
+/*
+	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/>.
+*/
+/**
+ * @author Christian <c@ethdev.com>
+ * @date 2017
+ * Converts a parsed assembly into its textual form.
+ */
+
+#include <libsolidity/inlineasm/AsmPrinter.h>
+
+#include <libsolidity/inlineasm/AsmData.h>
+
+#include <boost/algorithm/string.hpp>
+#include <boost/algorithm/string/replace.hpp>
+#include <boost/range/adaptor/transformed.hpp>
+
+#include <memory>
+#include <functional>
+
+using namespace std;
+using namespace dev;
+using namespace dev::solidity;
+using namespace dev::solidity::assembly;
+
+//@TODO source locations
+
+string AsmPrinter::operator()(assembly::Instruction const& _instruction)
+{
+	return boost::to_lower_copy(instructionInfo(_instruction.instruction).name);
+}
+
+string AsmPrinter::operator()(assembly::Literal const& _literal)
+{
+	if (_literal.isNumber)
+		return _literal.value;
+	string out;
+	for (char c: _literal.value)
+		if (c == '\\')
+			out += "\\\\";
+		else if (c == '"')
+			out += "\\";
+		else if (c == '\'')
+			out += "\\'";
+		else if (c == '\b')
+			out += "\\b";
+		else if (c == '\f')
+			out += "\\f";
+		else if (c == '\n')
+			out += "\\n";
+		else if (c == '\r')
+			out += "\\r";
+		else if (c == '\t')
+			out += "\\t";
+		else if (c == '\v')
+			out += "\\v";
+		else if (!isprint(c, locale::classic()))
+		{
+			ostringstream o;
+			o << std::hex << setfill('0') << setw(2) << unsigned(c);
+			out += "0x" + o.str();
+		}
+		else
+			out += c;
+	return out;
+}
+
+string AsmPrinter::operator()(assembly::Identifier const& _identifier)
+{
+	return _identifier.name;
+}
+
+string AsmPrinter::operator()(assembly::FunctionalInstruction const& _functionalInstruction)
+{
+	return
+		(*this)(_functionalInstruction.instruction); +
+		"(" +
+		boost::algorithm::join(
+			_functionalInstruction.arguments | boost::adaptors::transformed(boost::apply_visitor(*this)),
+			", " ) +
+		")";
+}
+
+string AsmPrinter::operator()(assembly::Label const& _label)
+{
+	return _label.name + ":";
+}
+
+string AsmPrinter::operator()(assembly::Assignment const& _assignment)
+{
+	return "=: " + (*this)(_assignment.variableName);
+}
+
+string AsmPrinter::operator()(assembly::FunctionalAssignment const& _functionalAssignment)
+{
+	return (*this)(_functionalAssignment.variableName) + " := " + boost::apply_visitor(*this, *_functionalAssignment.value);
+}
+
+string AsmPrinter::operator()(assembly::VariableDeclaration const& _variableDeclaration)
+{
+	return "let " + _variableDeclaration.name + " := " + boost::apply_visitor(*this, *_variableDeclaration.value);
+}
+
+string AsmPrinter::operator()(Block const& _block)
+{
+	string body = boost::algorithm::join(
+		_block.statements | boost::adaptors::transformed(boost::apply_visitor(*this)),
+		"\n"
+	);
+	boost::replace_all(body, "\n", "\n    ");
+	return "{\n    " + body + "\n}";
+}
diff --git a/libsolidity/inlineasm/AsmPrinter.h b/libsolidity/inlineasm/AsmPrinter.h
new file mode 100644
index 00000000..39069d02
--- /dev/null
+++ b/libsolidity/inlineasm/AsmPrinter.h
@@ -0,0 +1,61 @@
+/*
+	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/>.
+*/
+/**
+ * @author Christian <c@ethdev.com>
+ * @date 2017
+ * Converts a parsed assembly into its textual form.
+ */
+
+#pragma once
+
+#include <boost/variant.hpp>
+
+namespace dev
+{
+namespace solidity
+{
+namespace assembly
+{
+struct Instruction;
+struct Literal;
+struct Identifier;
+struct FunctionalInstruction;
+struct Label;
+struct Assignment;
+struct FunctionalAssignment;
+struct VariableDeclaration;
+struct FunctionDefinition;
+struct FunctionCall;
+struct Block;
+
+class AsmPrinter: public boost::static_visitor<std::string>
+{
+public:
+	std::string operator()(assembly::Instruction const& _instruction);
+	std::string operator()(assembly::Literal const& _literal);
+	std::string operator()(assembly::Identifier const& _identifier);
+	std::string operator()(assembly::FunctionalInstruction const& _functionalInstruction);
+	std::string operator()(assembly::Label const& _label);
+	std::string operator()(assembly::Assignment const& _assignment);
+	std::string operator()(assembly::FunctionalAssignment const& _functionalAssignment);
+	std::string operator()(assembly::VariableDeclaration const& _variableDeclaration);
+	std::string operator()(assembly::Block const& _block);
+};
+
+}
+}
+}
diff --git a/libsolidity/inlineasm/AsmStack.cpp b/libsolidity/inlineasm/AsmStack.cpp
index b8e0e857..6539e9bc 100644
--- a/libsolidity/inlineasm/AsmStack.cpp
+++ b/libsolidity/inlineasm/AsmStack.cpp
@@ -21,12 +21,17 @@
  */
 
 #include <libsolidity/inlineasm/AsmStack.h>
-#include <memory>
-#include <libevmasm/Assembly.h>
-#include <libevmasm/SourceLocation.h>
-#include <libsolidity/parsing/Scanner.h>
+
 #include <libsolidity/inlineasm/AsmParser.h>
 #include <libsolidity/inlineasm/AsmCodeGen.h>
+#include <libsolidity/inlineasm/AsmPrinter.h>
+
+#include <libsolidity/parsing/Scanner.h>
+
+#include <libevmasm/Assembly.h>
+#include <libevmasm/SourceLocation.h>
+
+#include <memory>
 
 using namespace std;
 using namespace dev;
@@ -44,6 +49,11 @@ bool InlineAssemblyStack::parse(shared_ptr<Scanner> const& _scanner)
 	return true;
 }
 
+string InlineAssemblyStack::print()
+{
+	return AsmPrinter()(*m_parserResult);
+}
+
 eth::Assembly InlineAssemblyStack::assemble()
 {
 	CodeGenerator codeGen(*m_parserResult, m_errors);
diff --git a/libsolidity/inlineasm/AsmStack.h b/libsolidity/inlineasm/AsmStack.h
index 1543cb2a..71d6c771 100644
--- a/libsolidity/inlineasm/AsmStack.h
+++ b/libsolidity/inlineasm/AsmStack.h
@@ -46,6 +46,10 @@ public:
 	/// Parse the given inline assembly chunk starting with `{` and ending with the corresponding `}`.
 	/// @return false or error.
 	bool parse(std::shared_ptr<Scanner> const& _scanner);
+	/// Converts the parser result back into a string form (not necessarily the same form
+	/// as the source form, but it should parse into the same parsed form again).
+	std::string print();
+
 	eth::Assembly assemble();
 
 	/// Parse and assemble a string in one run - for use in Solidity code generation itself.