CPP: Test dataflow through lambdas.

Author: geoffw0

cpp/ql/test/library-tests/dataflow/dataflow-tests/lambdas.cpp

@@ -0,0 +1,47 @@
+int source();
+void sink(...) {};
+
+// --- lambdas ---
+
+void test_lambdas()
+{
+	int t = source();
+	int u = 0;
+	int v = 0;
+	int w = 0;
+
+	auto a = [t, u]() -> int {
+		sink(t); // flow from source() [NOT DETECTED]
+		sink(u);
+		return t;
+	};
+	sink(a()); // flow from source() [NOT DETECTED]
+
+	auto b = [&] {
+		sink(t); // flow from source() [NOT DETECTED]
+		sink(u);
+		v = source(); // (v is reference captured)
+	};
+	b();
+	sink(v); // flow from source() [NOT DETECTED]
+
+	auto c = [=] {
+		sink(t); // flow from source() [NOT DETECTED]
+		sink(u);
+	};
+	c();
+
+	auto d = [](int a, int b) {
+		sink(a); // flow from source()
+		sink(b);
+	};
+	d(t, u);
+
+	auto e = [](int &a, int &b, int &c) {
+		sink(a); // flow from source()
+		sink(b);
+		c = source();
+	};
+	e(t, u, w);
+	sink(w); // flow from source() [NOT DETECTED]
+}

cpp/ql/test/library-tests/dataflow/dataflow-tests/test.expected

@@ -1,4 +1,6 @@
 | acrossLinkTargets.cpp:12:8:12:8 | x | acrossLinkTargets.cpp:19:27:19:32 | call to source |
+| lambdas.cpp:35:8:35:8 | a | lambdas.cpp:8:10:8:15 | call to source |
+| lambdas.cpp:41:8:41:8 | a | lambdas.cpp:8:10:8:15 | call to source |
 | test.cpp:7:8:7:9 | t1 | test.cpp:6:12:6:17 | call to source |
 | test.cpp:9:8:9:9 | t1 | test.cpp:6:12:6:17 | call to source |
 | test.cpp:10:8:10:9 | t2 | test.cpp:6:12:6:17 | call to source |

cpp/ql/test/library-tests/dataflow/dataflow-tests/test_diff.expected

@@ -1,3 +1,5 @@
+| lambdas.cpp:8:10:8:15 | lambdas.cpp:35:8:35:8 | AST only |
+| lambdas.cpp:8:10:8:15 | lambdas.cpp:41:8:41:8 | AST only |
 | test.cpp:89:28:89:34 | test.cpp:92:8:92:14 | IR only |
 | test.cpp:100:13:100:18 | test.cpp:103:10:103:12 | AST only |
 | test.cpp:109:9:109:14 | test.cpp:110:10:110:12 | IR only |