C++: Tests for cross-target dispatch

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

@@ -0,0 +1,42 @@
+int source();
+void sink(int);
+
+// For the purpose of this test, this function acts like it's defined in a
+// different link target such that we get two different functions named
+// `calleeAcrossLinkTargets` and no link from the caller to this one. The test
+// is getting that effect because the library can't distinguish the two
+// overloaded functions that differ only on `int` vs. `long`, so we might lose
+// this result and be forced to write a better test if the function signature
+// detection should improve.
+void calleeAcrossLinkTargets(long x) {
+  sink(x);
+}
+
+void calleeAcrossLinkTargets(int x); // no body
+
+
+void callerAcrossLinkTargets() {
+  calleeAcrossLinkTargets(source());
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+
+// No flow into this function as its signature is not unique (in the limited
+// model of the library).
+void ambiguousCallee(long x) {
+  sink(x);
+}
+
+// No flow into this function as its signature is not unique (in the limited
+// model of the library).
+void ambiguousCallee(short x) {
+  sink(x);
+}
+
+void ambiguousCallee(int x); // no body
+
+
+void ambiguousCaller() {
+  ambiguousCallee(source());
+}

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

@@ -1,3 +1,4 @@
+| acrossLinkTargets.cpp:12:8:12:8 | x | acrossLinkTargets.cpp:19:27:19:32 | 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 +1,4 @@
+| acrossLinkTargets.cpp:19:27:19:32 | acrossLinkTargets.cpp:12:8:12:8 | AST only |
 | test.cpp:66:30:66:36 | test.cpp:71:8:71:9 | 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 |