solidity/test/libsolidity/InlineAssembly.cpp

/*
    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 2016
 * Unit tests for inline assembly.
 */

#include "../TestHelper.h"

#include <libsolidity/inlineasm/AsmStack.h>
#include <libsolidity/parsing/Scanner.h>
#include <libsolidity/interface/Exceptions.h>
#include <libsolidity/ast/AST.h>
#include <test/libsolidity/ErrorCheck.h>
#include <libevmasm/Assembly.h>

#include <boost/optional.hpp>
#include <boost/algorithm/string/replace.hpp>

#include <string>
#include <memory>

using namespace std;

namespace dev
{
namespace solidity
{
namespace test
{

namespace
{

boost::optional<Error> parseAndReturnFirstError(string const& _source, bool _assemble = false, bool _allowWarnings = true)
{
	assembly::InlineAssemblyStack stack;
	bool success = false;
	try
	{
		success = stack.parse(std::make_shared<Scanner>(CharStream(_source)));
		if (success && _assemble)
			stack.assemble();
	}
	catch (FatalError const&)
	{
		BOOST_FAIL("Fatal error leaked.");
		success = false;
	}
	if (!success)
	{
		BOOST_REQUIRE_EQUAL(stack.errors().size(), 1);
		return *stack.errors().front();
	}
	else
	{
		// If success is true, there might still be an error in the assembly stage.
		if (_allowWarnings && Error::containsOnlyWarnings(stack.errors()))
			return {};
		else if (!stack.errors().empty())
		{
			if (!_allowWarnings)
				BOOST_CHECK_EQUAL(stack.errors().size(), 1);
			return *stack.errors().front();
		}
	}
	return {};
}

bool successParse(std::string const& _source, bool _assemble = false, bool _allowWarnings = true)
{
	return !parseAndReturnFirstError(_source, _assemble, _allowWarnings);
}

bool successAssemble(string const& _source, bool _allowWarnings = true)
{
	return successParse(_source, true, _allowWarnings);
}

Error expectError(std::string const& _source, bool _assemble, bool _allowWarnings = false)
{

	auto error = parseAndReturnFirstError(_source, _assemble, _allowWarnings);
	BOOST_REQUIRE(error);
	return *error;
}

void parsePrintCompare(string const& _source)
{
	assembly::InlineAssemblyStack stack;
	BOOST_REQUIRE(stack.parse(std::make_shared<Scanner>(CharStream(_source))));
	BOOST_REQUIRE(stack.errors().empty());
	BOOST_CHECK_EQUAL(stack.toString(), _source);
}

}

#define CHECK_ERROR(text, assemble, typ, substring) \
do \
{ \
	Error err = expectError((text), (assemble), false); \
	BOOST_CHECK(err.type() == (Error::Type::typ)); \
	BOOST_CHECK(searchErrorMessage(err, (substring))); \
} while(0)

#define CHECK_PARSE_ERROR(text, type, substring) \
CHECK_ERROR(text, false, type, substring)

#define CHECK_ASSEMBLE_ERROR(text, type, substring) \
CHECK_ERROR(text, true, type, substring)



BOOST_AUTO_TEST_SUITE(SolidityInlineAssembly)


BOOST_AUTO_TEST_SUITE(Parsing)

BOOST_AUTO_TEST_CASE(smoke_test)
{
	BOOST_CHECK(successParse("{ }"));
}

BOOST_AUTO_TEST_CASE(simple_instructions)
{
	BOOST_CHECK(successParse("{ dup1 dup1 mul dup1 sub pop }"));
}

BOOST_AUTO_TEST_CASE(suicide_selfdestruct)
{
	BOOST_CHECK(successParse("{ 0x01 suicide 0x02 selfdestruct }"));
}

BOOST_AUTO_TEST_CASE(keywords)
{
	BOOST_CHECK(successParse("{ 1 2 byte 2 return address pop }"));
}

BOOST_AUTO_TEST_CASE(constants)
{
	BOOST_CHECK(successParse("{ 7 8 mul pop }"));
}

BOOST_AUTO_TEST_CASE(vardecl)
{
	BOOST_CHECK(successParse("{ let x := 7 }"));
}

BOOST_AUTO_TEST_CASE(vardecl_name_clashes)
{
	CHECK_PARSE_ERROR("{ let x := 1 let x := 2 }", DeclarationError, "Variable name x already taken in this scope.");
}

BOOST_AUTO_TEST_CASE(vardecl_multi)
{
	BOOST_CHECK(successParse("{ function f() -> x, y {} let x, y := f() }"));
}

BOOST_AUTO_TEST_CASE(vardecl_multi_conflict)
{
	CHECK_PARSE_ERROR("{ function f() -> x, y {} let x, x := f() }", DeclarationError, "Variable name x already taken in this scope.");
}

BOOST_AUTO_TEST_CASE(vardecl_bool)
{
	CHECK_PARSE_ERROR("{ let x := true }", ParserError, "True and false are not valid literals.");
	CHECK_PARSE_ERROR("{ let x := false }", ParserError, "True and false are not valid literals.");
}

BOOST_AUTO_TEST_CASE(assignment)
{
	BOOST_CHECK(successParse("{ let x := 2 7 8 add =: x }"));
}

BOOST_AUTO_TEST_CASE(label)
{
	BOOST_CHECK(successParse("{ 7 abc: 8 eq abc jump pop }"));
}

BOOST_AUTO_TEST_CASE(label_complex)
{
	BOOST_CHECK(successParse("{ 7 abc: 8 eq jump(abc) jumpi(eq(7, 8), abc) pop }"));
}

BOOST_AUTO_TEST_CASE(functional)
{
	BOOST_CHECK(successParse("{ let x := 2 add(7, mul(6, x)) mul(7, 8) add =: x }"));
}

BOOST_AUTO_TEST_CASE(functional_assignment)
{
	BOOST_CHECK(successParse("{ let x := 2 x := 7 }"));
}

BOOST_AUTO_TEST_CASE(functional_assignment_complex)
{
	BOOST_CHECK(successParse("{ let x := 2 x := add(7, mul(6, x)) mul(7, 8) add }"));
}

BOOST_AUTO_TEST_CASE(vardecl_complex)
{
	BOOST_CHECK(successParse("{ let y := 2 let x := add(7, mul(6, y)) add mul(7, 8) }"));
}

BOOST_AUTO_TEST_CASE(variable_use_before_decl)
{
	CHECK_PARSE_ERROR("{ x := 2 let x := 3 }", DeclarationError, "Variable x used before it was declared.");
	CHECK_PARSE_ERROR("{ let x := mul(2, x) }", DeclarationError, "Variable x used before it was declared.");
}

BOOST_AUTO_TEST_CASE(switch_statement)
{
	BOOST_CHECK(successParse("{ switch 42 default {} }"));
	BOOST_CHECK(successParse("{ switch 42 case 1 {} }"));
	BOOST_CHECK(successParse("{ switch 42 case 1 {} case 2 {} }"));
	BOOST_CHECK(successParse("{ switch 42 case 1 {} default {} }"));
	BOOST_CHECK(successParse("{ switch 42 case 1 {} case 2 {} default {} }"));
	BOOST_CHECK(successParse("{ switch mul(1, 2) case 1 {} case 2 {} default {} }"));
	BOOST_CHECK(successParse("{ function f() -> x {} switch f() case 1 {} case 2 {} default {} }"));
}

BOOST_AUTO_TEST_CASE(switch_no_cases)
{
	CHECK_PARSE_ERROR("{ switch 42 }", ParserError, "Switch statement without any cases.");
}

BOOST_AUTO_TEST_CASE(switch_duplicate_case)
{
	CHECK_PARSE_ERROR("{ switch 42 case 1 {} case 1 {} default {} }", DeclarationError, "Duplicate case defined");
}

BOOST_AUTO_TEST_CASE(switch_invalid_expression)
{
	CHECK_PARSE_ERROR("{ switch {} default {} }", ParserError, "Expected elementary inline assembly operation.");
	CHECK_PARSE_ERROR("{ 1 2 switch mul default {} }", ParserError, "Instructions are not supported as expressions for switch.");
}

BOOST_AUTO_TEST_CASE(switch_default_before_case)
{
	CHECK_PARSE_ERROR("{ switch 42 default {} case 1 {} }", ParserError, "Case not allowed after default case.");
}

BOOST_AUTO_TEST_CASE(switch_duplicate_default_case)
{
	CHECK_PARSE_ERROR("{ switch 42 default {} default {} }", ParserError, "Only one default case allowed.");
}

BOOST_AUTO_TEST_CASE(switch_invalid_case)
{
	CHECK_PARSE_ERROR("{ switch 42 case mul(1, 2) {} case 2 {} default {} }", ParserError, "Literal expected.");
}

BOOST_AUTO_TEST_CASE(switch_invalid_body)
{
	CHECK_PARSE_ERROR("{ switch 42 case 1 mul case 2 {} default {} }", ParserError, "Expected token LBrace got 'Identifier'");
}

BOOST_AUTO_TEST_CASE(blocks)
{
	BOOST_CHECK(successParse("{ let x := 7 { let y := 3 } { let z := 2 } }"));
}

BOOST_AUTO_TEST_CASE(function_definitions)
{
	BOOST_CHECK(successParse("{ function f() { } function g(a) -> x { } }"));
}

BOOST_AUTO_TEST_CASE(function_definitions_multiple_args)
{
	BOOST_CHECK(successParse("{ function f(a, d) { } function g(a, d) -> x, y { } }"));
}

BOOST_AUTO_TEST_CASE(function_calls)
{
	BOOST_CHECK(successParse("{ function f(a) -> b {} function g(a, b, c) {} function x() { g(1, 2, f(mul(2, 3))) x() } }"));
}

BOOST_AUTO_TEST_CASE(opcode_for_functions)
{
	CHECK_PARSE_ERROR("{ function gas() { } }", ParserError, "Cannot use instruction names for identifier names.");
}

BOOST_AUTO_TEST_CASE(opcode_for_function_args)
{
	CHECK_PARSE_ERROR("{ function f(gas) { } }", ParserError, "Cannot use instruction names for identifier names.");
	CHECK_PARSE_ERROR("{ function f() -> gas { } }", ParserError, "Cannot use instruction names for identifier names.");
}

BOOST_AUTO_TEST_CASE(name_clashes)
{
	CHECK_PARSE_ERROR("{ let g := 2 function g() { } }", DeclarationError, "Function name g already taken in this scope");
}

BOOST_AUTO_TEST_CASE(variable_access_cross_functions)
{
	CHECK_PARSE_ERROR("{ let x := 2 function g() { x pop } }", DeclarationError, "Identifier not found.");
}

BOOST_AUTO_TEST_CASE(invalid_tuple_assignment)
{
	/// The push(42) is added here to silence the unbalanced stack error, so that there's only one error reported.
	CHECK_PARSE_ERROR("{ 42 let x, y := 1 }", DeclarationError, "Variable count mismatch.");
}

BOOST_AUTO_TEST_CASE(instruction_too_few_arguments)
{
	CHECK_PARSE_ERROR("{ mul() }", ParserError, "Expected expression (MUL expects 2 arguments)");
	CHECK_PARSE_ERROR("{ mul(1) }", ParserError, "Expected comma (MUL expects 2 arguments)");
}

BOOST_AUTO_TEST_CASE(instruction_too_many_arguments)
{
	CHECK_PARSE_ERROR("{ mul(1, 2, 3) }", ParserError, "Expected ')' (MUL expects 2 arguments)");
}

BOOST_AUTO_TEST_SUITE_END()

BOOST_AUTO_TEST_SUITE(Printing)

BOOST_AUTO_TEST_CASE(print_smoke)
{
	parsePrintCompare("{\n}");
}

BOOST_AUTO_TEST_CASE(print_instructions)
{
	parsePrintCompare("{\n    7\n    8\n    mul\n    dup10\n    add\n    pop\n}");
}

BOOST_AUTO_TEST_CASE(print_subblock)
{
	parsePrintCompare("{\n    {\n        dup4\n        add\n    }\n}");
}

BOOST_AUTO_TEST_CASE(print_functional)
{
	parsePrintCompare("{\n    let x := mul(sload(0x12), 7)\n}");
}

BOOST_AUTO_TEST_CASE(print_label)
{
	parsePrintCompare("{\n    loop:\n    jump(loop)\n}");
}

BOOST_AUTO_TEST_CASE(print_assignments)
{
	parsePrintCompare("{\n    let x := mul(2, 3)\n    7\n    =: x\n    x := add(1, 2)\n}");
}

BOOST_AUTO_TEST_CASE(print_multi_assignments)
{
	parsePrintCompare("{\n    function f() -> x, y\n    {\n    }\n    let x, y := f()\n}");
}

BOOST_AUTO_TEST_CASE(print_string_literals)
{
	parsePrintCompare("{\n    \"\\n'\\xab\\x95\\\"\"\n    pop\n}");
}

BOOST_AUTO_TEST_CASE(print_string_literal_unicode)
{
	string source = "{ let x := \"\\u1bac\" }";
	string parsed = "{\n    let x := \"\\xe1\\xae\\xac\"\n}";
	assembly::InlineAssemblyStack stack;
	BOOST_REQUIRE(stack.parse(std::make_shared<Scanner>(CharStream(source))));
	BOOST_REQUIRE(stack.errors().empty());
	BOOST_CHECK_EQUAL(stack.toString(), parsed);
	parsePrintCompare(parsed);
}

BOOST_AUTO_TEST_CASE(print_switch)
{
	parsePrintCompare("{\n    switch 42\n    case 1 {\n    }\n    case 2 {\n    }\n    default {\n    }\n}");
}

BOOST_AUTO_TEST_CASE(function_definitions_multiple_args)
{
	parsePrintCompare("{\n    function f(a, d)\n    {\n        mstore(a, d)\n    }\n    function g(a, d) -> x, y\n    {\n    }\n}");
}

BOOST_AUTO_TEST_CASE(function_calls)
{
	string source = R"({
	function y()
	{
	}
	function f(a) -> b
	{
	}
	function g(a, b, c)
	{
	}
	g(1, mul(2, address), f(mul(2, caller)))
	y()
})";
	boost::replace_all(source, "\t", "    ");
	parsePrintCompare(source);
}

BOOST_AUTO_TEST_SUITE_END()

BOOST_AUTO_TEST_SUITE(Analysis)

BOOST_AUTO_TEST_CASE(string_literals)
{
	BOOST_CHECK(successAssemble("{ let x := \"12345678901234567890123456789012\" }"));
}

BOOST_AUTO_TEST_CASE(oversize_string_literals)
{
	CHECK_ASSEMBLE_ERROR("{ let x := \"123456789012345678901234567890123\" }", TypeError, "String literal too long");
}

BOOST_AUTO_TEST_CASE(assignment_after_tag)
{
	BOOST_CHECK(successParse("{ let x := 1 { 7 tag: =: x } }"));
}

BOOST_AUTO_TEST_CASE(magic_variables)
{
	CHECK_ASSEMBLE_ERROR("{ this pop }", DeclarationError, "Identifier not found");
	CHECK_ASSEMBLE_ERROR("{ ecrecover pop }", DeclarationError, "Identifier not found");
	BOOST_CHECK(successAssemble("{ let ecrecover := 1 ecrecover pop }"));
}

BOOST_AUTO_TEST_CASE(stack_variables)
{
	BOOST_CHECK(successAssemble("{ let y := 3 { 2 { let x := y } pop} }"));
}

BOOST_AUTO_TEST_CASE(imbalanced_stack)
{
	BOOST_CHECK(successAssemble("{ 1 2 mul pop }", false));
	CHECK_ASSEMBLE_ERROR("{ 1 }", DeclarationError, "Unbalanced stack at the end of a block: 1 surplus item(s).");
	CHECK_ASSEMBLE_ERROR("{ pop }", DeclarationError, "Unbalanced stack at the end of a block: 1 missing item(s).");
	BOOST_CHECK(successAssemble("{ let x := 4 7 add }", false));
}

BOOST_AUTO_TEST_CASE(error_tag)
{
	CHECK_ASSEMBLE_ERROR("{ jump(invalidJumpLabel) }", DeclarationError, "Identifier not found");
}

BOOST_AUTO_TEST_CASE(designated_invalid_instruction)
{
	BOOST_CHECK(successAssemble("{ invalid }"));
}

BOOST_AUTO_TEST_CASE(inline_assembly_shadowed_instruction_declaration)
{
	CHECK_ASSEMBLE_ERROR("{ let gas := 1 }", ParserError, "Cannot use instruction names for identifier names.");
}

BOOST_AUTO_TEST_CASE(inline_assembly_shadowed_instruction_assignment)
{
	CHECK_ASSEMBLE_ERROR("{ 2 =: gas }", ParserError, "Identifier expected, got instruction name.");
}

BOOST_AUTO_TEST_CASE(inline_assembly_shadowed_instruction_functional_assignment)
{
	CHECK_ASSEMBLE_ERROR("{ gas := 2 }", ParserError, "Label name / variable name must precede \":\"");
}

BOOST_AUTO_TEST_CASE(revert)
{
	BOOST_CHECK(successAssemble("{ revert(0, 0) }"));
}

BOOST_AUTO_TEST_SUITE_END()

BOOST_AUTO_TEST_SUITE_END()

}
}
} // end namespaces