From edda79eec546674c8c1f0128c63939921f4ff1f2 Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Wed, 9 Jan 2019 16:50:41 +0100
Subject: Variables are free with regards to code size.

---
 test/libyul/Metrics.cpp | 116 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 test/libyul/Metrics.cpp

(limited to 'test')

diff --git a/test/libyul/Metrics.cpp b/test/libyul/Metrics.cpp
new file mode 100644
index 00000000..185a3755
--- /dev/null
+++ b/test/libyul/Metrics.cpp
@@ -0,0 +1,116 @@
+/*
+    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/>.
+*/
+/**
+ * Unit tests for the code metrics.
+ */
+
+#include <test/Options.h>
+
+#include <test/libyul/Common.h>
+
+#include <libyul/optimiser/Metrics.h>
+#include <libyul/AsmData.h>
+
+
+using namespace std;
+using namespace langutil;
+
+namespace yul
+{
+namespace test
+{
+
+namespace
+{
+
+size_t codeSize(string const& _source)
+{
+	shared_ptr<Block> ast = parse(_source, false).first;
+	BOOST_REQUIRE(ast);
+	return CodeSize::codeSize(*ast);
+}
+
+}
+
+BOOST_AUTO_TEST_SUITE(YulCodeSize)
+
+BOOST_AUTO_TEST_CASE(empty_code)
+{
+	BOOST_CHECK_EQUAL(codeSize("{}"), 0);
+}
+
+BOOST_AUTO_TEST_CASE(nested_blocks)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ {} {} {{ }} }"), 0);
+}
+
+BOOST_AUTO_TEST_CASE(instruction)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ pop(calldatasize()) }"), 2);
+}
+
+BOOST_AUTO_TEST_CASE(variables_are_free)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ let x let y let a, b, c }"), 0);
+}
+
+BOOST_AUTO_TEST_CASE(constants_cost_one)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ let x := 3 }"), 1);
+}
+
+BOOST_AUTO_TEST_CASE(functions_are_skipped)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ function f(x) -> r { r := mload(x) } }"), 0);
+}
+
+BOOST_AUTO_TEST_CASE(function_with_arguments)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ function f(x) { sstore(x, 2) } f(2) }"), 2);
+}
+
+BOOST_AUTO_TEST_CASE(function_with_variables_as_arguments)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ function f(x) { sstore(x, 2) } let y f(y) }"), 1);
+}
+
+BOOST_AUTO_TEST_CASE(function_with_variables_and_constants_as_arguments)
+{
+	BOOST_CHECK_EQUAL(codeSize(
+		"{ function f(x, r) -> z { sstore(x, r) z := r } let y let t := f(y, 2) }"
+	), 2);
+}
+
+BOOST_AUTO_TEST_CASE(assignment)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ let a a := 3 }"), 1);
+}
+
+BOOST_AUTO_TEST_CASE(assignments_between_vars_are_free)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ let a let b := a a := b }"), 0);
+}
+
+BOOST_AUTO_TEST_CASE(assignment_complex)
+{
+	BOOST_CHECK_EQUAL(codeSize("{ let a let x := mload(a) a := sload(x) }"), 2);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+
+}
+}
-- 
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