10 files changed, 49 insertions, 2 deletions
diff --git a/libsolidity/analysis/ViewPureChecker.cpp b/libsolidity/analysis/ViewPureChecker.cpp
index 7f28c7d2..7e41fc16 100644
--- a/libsolidity/analysis/ViewPureChecker.cpp
+++ b/libsolidity/analysis/ViewPureChecker.cpp
@@ -72,6 +72,11 @@ public:
 		for (auto const& arg: _funCall.arguments)
 			boost::apply_visitor(*this, arg);
 	}
+	void operator()(assembly::If const& _if)
+	{
+		boost::apply_visitor(*this, *_if.condition);
+		(*this)(_if.body);
+	}
 	void operator()(assembly::Switch const& _switch)
 	{
 		boost::apply_visitor(*this, *_switch.expression);
diff --git a/libsolidity/inlineasm/AsmAnalysis.cpp b/libsolidity/inlineasm/AsmAnalysis.cpp
index e5bdc90f..2804ddfc 100644
--- a/libsolidity/inlineasm/AsmAnalysis.cpp
+++ b/libsolidity/inlineasm/AsmAnalysis.cpp
@@ -286,6 +286,22 @@ bool AsmAnalyzer::operator()(assembly::FunctionCall const& _funCall)
 	return success;
 }
 
+bool AsmAnalyzer::operator()(If const& _if)
+{
+	bool success = true;
+
+	if (!expectExpression(*_if.condition))
+		success = false;
+	m_stackHeight--;
+
+	if (!(*this)(_if.body))
+		success = false;
+
+	m_info.stackHeightInfo[&_if] = m_stackHeight;
+
+	return success;
+}
+
 bool AsmAnalyzer::operator()(Switch const& _switch)
 {
 	bool success = true;
diff --git a/libsolidity/inlineasm/AsmAnalysis.h b/libsolidity/inlineasm/AsmAnalysis.h
index 9b2a8f9c..e484b876 100644
--- a/libsolidity/inlineasm/AsmAnalysis.h
+++ b/libsolidity/inlineasm/AsmAnalysis.h
@@ -70,6 +70,7 @@ public:
 	bool operator()(assembly::VariableDeclaration const& _variableDeclaration);
 	bool operator()(assembly::FunctionDefinition const& _functionDefinition);
 	bool operator()(assembly::FunctionCall const& _functionCall);
+	bool operator()(assembly::If const& _if);
 	bool operator()(assembly::Switch const& _switch);
 	bool operator()(assembly::ForLoop const& _forLoop);
 	bool operator()(assembly::Block const& _block);
diff --git a/libsolidity/inlineasm/AsmData.h b/libsolidity/inlineasm/AsmData.h
index b0dd85ca..a792a1b8 100644
--- a/libsolidity/inlineasm/AsmData.h
+++ b/libsolidity/inlineasm/AsmData.h
@@ -68,6 +68,8 @@ struct VariableDeclaration { SourceLocation location; TypedNameList variables; s
 struct Block { SourceLocation location; std::vector<Statement> statements; };
 /// Function definition ("function f(a, b) -> (d, e) { ... }")
 struct FunctionDefinition { SourceLocation location; std::string name; TypedNameList arguments; TypedNameList returns; Block body; };
+/// Conditional execution without "else" part.
+struct If { SourceLocation location; std::shared_ptr<Statement> condition; Block body; };
 /// Switch case or default case
 struct Case { SourceLocation location; std::shared_ptr<Literal> value; Block body; };
 /// Switch statement
diff --git a/libsolidity/inlineasm/AsmDataForward.h b/libsolidity/inlineasm/AsmDataForward.h
index 4ead7ff5..d627b41a 100644
--- a/libsolidity/inlineasm/AsmDataForward.h
+++ b/libsolidity/inlineasm/AsmDataForward.h
@@ -41,11 +41,12 @@ struct VariableDeclaration;
 struct FunctionalInstruction;
 struct FunctionDefinition;
 struct FunctionCall;
+struct If;
 struct Switch;
 struct ForLoop;
 struct Block;
 
-using Statement = boost::variant<Instruction, Literal, Label, StackAssignment, Identifier, Assignment, FunctionCall, FunctionalInstruction, VariableDeclaration, FunctionDefinition, Switch, ForLoop, Block>;
+using Statement = boost::variant<Instruction, Literal, Label, StackAssignment, Identifier, Assignment, FunctionCall, FunctionalInstruction, VariableDeclaration, FunctionDefinition, If, Switch, ForLoop, Block>;
 
 }
 }
diff --git a/libsolidity/inlineasm/AsmParser.cpp b/libsolidity/inlineasm/AsmParser.cpp
index 1f4df75b..8f171005 100644
--- a/libsolidity/inlineasm/AsmParser.cpp
+++ b/libsolidity/inlineasm/AsmParser.cpp
@@ -73,13 +73,23 @@ assembly::Statement Parser::parseStatement()
 		return parseFunctionDefinition();
 	case Token::LBrace:
 		return parseBlock();
+	case Token::If:
+	{
+		assembly::If _if = createWithLocation<assembly::If>();
+		m_scanner->next();
+		_if.condition = make_shared<Statement>(parseExpression());
+		if (_if.condition->type() == typeid(assembly::Instruction))
+			fatalParserError("Instructions are not supported as conditions for if - try to append \"()\".");
+		_if.body = parseBlock();
+		return _if;
+	}
 	case Token::Switch:
 	{
 		assembly::Switch _switch = createWithLocation<assembly::Switch>();
 		m_scanner->next();
 		_switch.expression = make_shared<Statement>(parseExpression());
 		if (_switch.expression->type() == typeid(assembly::Instruction))
-			fatalParserError("Instructions are not supported as expressions for switch.");
+			fatalParserError("Instructions are not supported as expressions for switch - try to append \"()\".");
 		while (m_scanner->currentToken() == Token::Case)
 			_switch.cases.emplace_back(parseCase());
 		if (m_scanner->currentToken() == Token::Default)
diff --git a/libsolidity/inlineasm/AsmPrinter.cpp b/libsolidity/inlineasm/AsmPrinter.cpp
index a5272808..0f183244 100644
--- a/libsolidity/inlineasm/AsmPrinter.cpp
+++ b/libsolidity/inlineasm/AsmPrinter.cpp
@@ -174,6 +174,11 @@ string AsmPrinter::operator()(assembly::FunctionCall const& _functionCall)
 		")";
 }
 
+string AsmPrinter::operator()(If const& _if)
+{
+	return "if " + boost::apply_visitor(*this, *_if.condition) + "\n" + (*this)(_if.body);
+}
+
 string AsmPrinter::operator()(Switch const& _switch)
 {
 	string out = "switch " + boost::apply_visitor(*this, *_switch.expression);
diff --git a/libsolidity/inlineasm/AsmPrinter.h b/libsolidity/inlineasm/AsmPrinter.h
index 66520632..eadf81d9 100644
--- a/libsolidity/inlineasm/AsmPrinter.h
+++ b/libsolidity/inlineasm/AsmPrinter.h
@@ -48,6 +48,7 @@ public:
 	std::string operator()(assembly::VariableDeclaration const& _variableDeclaration);
 	std::string operator()(assembly::FunctionDefinition const& _functionDefinition);
 	std::string operator()(assembly::FunctionCall const& _functionCall);
+	std::string operator()(assembly::If const& _if);
 	std::string operator()(assembly::Switch const& _switch);
 	std::string operator()(assembly::ForLoop const& _forLoop);
 	std::string operator()(assembly::Block const& _block);
diff --git a/libsolidity/inlineasm/AsmScopeFiller.cpp b/libsolidity/inlineasm/AsmScopeFiller.cpp
index b70ae9ac..77ae9102 100644
--- a/libsolidity/inlineasm/AsmScopeFiller.cpp
+++ b/libsolidity/inlineasm/AsmScopeFiller.cpp
@@ -104,6 +104,11 @@ bool ScopeFiller::operator()(assembly::FunctionDefinition const& _funDef)
 	return success;
 }
 
+bool ScopeFiller::operator()(If const& _if)
+{
+	return (*this)(_if.body);
+}
+
 bool ScopeFiller::operator()(Switch const& _switch)
 {
 	bool success = true;
diff --git a/libsolidity/inlineasm/AsmScopeFiller.h b/libsolidity/inlineasm/AsmScopeFiller.h
index 80c03d2c..ed28abbf 100644
--- a/libsolidity/inlineasm/AsmScopeFiller.h
+++ b/libsolidity/inlineasm/AsmScopeFiller.h
@@ -59,6 +59,7 @@ public:
 	bool operator()(assembly::VariableDeclaration const& _variableDeclaration);
 	bool operator()(assembly::FunctionDefinition const& _functionDefinition);
 	bool operator()(assembly::FunctionCall const&) { return true; }
+	bool operator()(assembly::If const& _if);
 	bool operator()(assembly::Switch const& _switch);
 	bool operator()(assembly::ForLoop const& _forLoop);
 	bool operator()(assembly::Block const& _block);