Fix gas for builtin.

Fixes #1300

libsolidity/ArrayUtils.cpp

@@ -125,6 +125,7 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 			CompilerUtils(m_context).loadFromMemoryDynamic(*sourceBaseType, true, true, false);
 		else
 			solAssert(false, "Copying of unknown type requested: " + sourceBaseType->toString());
+		solAssert(2 + sourceBaseType->getSizeOnStack() <= 16, "Stack too deep.");
 		m_context << eth::dupInstruction(2 + sourceBaseType->getSizeOnStack());
 		StorageItem(m_context, *targetBaseType).storeValue(*sourceBaseType, SourceLocation(), true);
 	}

libsolidity/Compiler.cpp

@@ -228,6 +228,7 @@ void Compiler::appendCalldataUnpacker(TypePointers const& _typeParameters, bool
 				{
 					// Retrieve data start offset by adding length to start offset of previous dynamic type
 					unsigned stackDepth = m_context.getStackHeight() - stackHeightOfPreviousDynamicArgument;
+					solAssert(stackDepth <= 16, "Stack too deep.");
 					m_context << eth::dupInstruction(stackDepth) << eth::dupInstruction(stackDepth);
 					ArrayUtils(m_context).convertLengthToSize(*previousDynamicType, true);
 					m_context << eth::Instruction::ADD;
@@ -359,6 +360,7 @@ bool Compiler::visit(FunctionDefinition const& _function)
 		stackLayout.push_back(i);
 	stackLayout += vector<int>(c_localVariablesSize, -1);
 
+	solAssert(stackLayout.size() <= 17, "Stack too deep.");
 	while (stackLayout.back() != int(stackLayout.size() - 1))
 		if (stackLayout.back() < 0)
 		{

libsolidity/CompilerUtils.cpp

@@ -138,6 +138,7 @@ void CompilerUtils::moveToStackVariable(VariableDeclaration const& _variable)
 {
 	unsigned const stackPosition = m_context.baseToCurrentStackOffset(m_context.getBaseStackOffsetOfVariable(_variable));
 	unsigned const size = _variable.getType()->getSizeOnStack();
+	solAssert(stackPosition >= size, "Variable size and position mismatch.");
 	// move variable starting from its top end in the stack
 	if (stackPosition - size + 1 > 16)
 		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_sourceLocation(_variable.getLocation())
@@ -148,8 +149,7 @@ void CompilerUtils::moveToStackVariable(VariableDeclaration const& _variable)
 
 void CompilerUtils::copyToStackTop(unsigned _stackDepth, unsigned _itemSize)
 {
-	if (_stackDepth > 16)
-		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Stack too deep."));
+	solAssert(_stackDepth <= 16, "Stack too deep.");
 	for (unsigned i = 0; i < _itemSize; ++i)
 		m_context << eth::dupInstruction(_stackDepth);
 }

libsolidity/ExpressionCompiler.cpp

@@ -233,10 +233,13 @@ bool ExpressionCompiler::visit(Assignment const& _assignment)
 		m_currentLValue->retrieveValue(_assignment.getLocation(), true);
 		appendOrdinaryBinaryOperatorCode(Token::AssignmentToBinaryOp(op), *_assignment.getType());
 		if (lvalueSize > 0)
+		{
+			solAssert(itemSize + lvalueSize <= 16, "Stack too deep.");
 			// value [lvalue_ref] updated_value
 			for (unsigned i = 0; i < itemSize; ++i)
 				m_context << eth::swapInstruction(itemSize + lvalueSize) << eth::Instruction::POP;
 		}
+	}
 	m_currentLValue->storeValue(*_assignment.getRightHandSide().getType(), _assignment.getLocation());
 	m_currentLValue.reset();
 	return false;
@@ -557,10 +560,13 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 		case Location::SHA256:
 		case Location::RIPEMD160:
 		{
+			_functionCall.getExpression().accept(*this);
 			static const map<Location, u256> contractAddresses{{Location::ECRecover, 1},
 															   {Location::SHA256, 2},
 															   {Location::RIPEMD160, 3}};
 			m_context << contractAddresses.find(function.getLocation())->second;
+			for (unsigned i = function.getSizeOnStack(); i > 0; --i)
+				m_context << eth::swapInstruction(i);
 			appendExternalFunctionCall(function, arguments, true);
 			break;
 		}

libsolidity/LValue.cpp

@@ -167,6 +167,7 @@ void StorageItem::storeValue(Type const& _sourceType, SourceLocation const& _loc
 				// stack: source_ref target_ref member_offset source_member_ref
 				StorageItem(m_context, *memberType).retrieveValue(_location, true);
 				// stack: source_ref target_ref member_offset source_value...
+				solAssert(2 + memberType->getSizeOnStack() <= 16, "Stack too deep.");
 				m_context << eth::dupInstruction(2 + memberType->getSizeOnStack())
 					<< eth::dupInstruction(2 + memberType->getSizeOnStack()) << eth::Instruction::ADD;
 				// stack: source_ref target_ref member_offset source_value... target_member_ref

test/SolidityEndToEndTest.cpp

@@ -1647,6 +1647,21 @@ BOOST_AUTO_TEST_CASE(gas_and_value_basic)
 	BOOST_REQUIRE(callContractFunction("checkState()", 5) == encodeArgs(false, 20 - 5));
 }
 
+BOOST_AUTO_TEST_CASE(gas_for_builtin)
+{
+	char const* sourceCode = R"(
+		contract Contract {
+			function test(uint g) returns (bytes32 data, bool flag) {
+				data = ripemd160.gas(g)("abc");
+				flag = true;
+			}
+		}
+	)";
+	compileAndRun(sourceCode);
+	BOOST_CHECK(callContractFunction("test(uint256)", 500) == bytes());
+	BOOST_CHECK(callContractFunction("test(uint256)", 800) == encodeArgs(u256("0x8eb208f7e05d987a9b044a8e98c6b087f15a0bfc"), true));
+}
+
 BOOST_AUTO_TEST_CASE(value_complex)
 {
 	char const* sourceCode = R"(