Promote the src/tools crate to the top-level workspace.

The 'src' and 'tests' top-level directories now contain tools sources
and integration tests for any of the library crates.

cranelift/tests/cfg_traversal.rs

@@ -0,0 +1,146 @@
+extern crate cretonne;
+extern crate cton_reader;
+
+use self::cton_reader::parse_functions;
+use self::cretonne::ir::Ebb;
+use self::cretonne::cfg::ControlFlowGraph;
+use self::cretonne::entity_map::EntityMap;
+
+fn test_reverse_postorder_traversal(function_source: &str, ebb_order: Vec<u32>) {
+    let func = &parse_functions(function_source).unwrap()[0];
+    let cfg = ControlFlowGraph::new(&func);
+    let ebbs = ebb_order.iter().map(|n| Ebb::with_number(*n).unwrap())
+                               .collect::<Vec<Ebb>>();
+
+    let mut postorder_ebbs = cfg.postorder_ebbs();
+    let mut postorder_map = EntityMap::with_capacity(postorder_ebbs.len());
+    for (i, ebb) in postorder_ebbs.iter().enumerate() {
+        postorder_map[ebb.clone()] = i + 1;
+    }
+    postorder_ebbs.reverse();
+
+    assert_eq!(postorder_ebbs.len(), ebbs.len());
+    for ebb in postorder_ebbs {
+        assert_eq!(ebb, ebbs[ebbs.len() - postorder_map[ebb]]);
+    }
+}
+
+#[test]
+fn simple_traversal() {
+    test_reverse_postorder_traversal("
+        function test(i32) {
+            ebb0(v0: i32):
+               brz v0, ebb1
+               jump ebb2
+            ebb1:
+                jump ebb3
+            ebb2:
+                v1 = iconst.i32 1
+                v2 = iadd v1, v0
+                brz v2, ebb2
+                v3 = iadd v1, v2
+                brz v3, ebb1
+                v4 = iadd v1, v3
+                brz v4, ebb4
+                jump ebb5
+            ebb3:
+                trap
+            ebb4:
+                trap
+            ebb5:
+                trap
+        }
+    ", vec![0, 2, 1, 3, 4, 5]);
+}
+
+#[test]
+fn loops_one() {
+    test_reverse_postorder_traversal("
+        function test(i32) {
+            ebb0(v0: i32):
+                jump ebb1
+            ebb1:
+                brnz v0, ebb3
+                jump ebb2
+            ebb2:
+                jump ebb3
+            ebb3:
+                return
+        }
+    ", vec![0, 1, 2, 3]);
+}
+
+#[test]
+fn loops_two() {
+    test_reverse_postorder_traversal("
+        function test(i32) {
+            ebb0(v0: i32):
+                brz v0, ebb1
+                jump ebb2
+            ebb1:
+                jump ebb3
+            ebb2:
+                brz v0, ebb4
+                jump ebb5
+            ebb3:
+                jump ebb4
+            ebb4:
+                brz v0, ebb3
+                jump ebb5
+            ebb5:
+                brz v0, ebb4
+                return
+        }
+    ", vec![0, 1, 2, 5, 4, 3]);
+}
+
+#[test]
+fn loops_three() {
+    test_reverse_postorder_traversal("
+        function test(i32) {
+            ebb0(v0: i32):
+                brz v0, ebb1
+                jump ebb2
+            ebb1:
+                jump ebb3
+            ebb2:
+                brz v0, ebb4
+                jump ebb5
+            ebb3:
+                jump ebb4
+            ebb4:
+                brz v0, ebb3
+                brnz v0, ebb5
+                jump ebb6
+            ebb5:
+                brz v0, ebb4
+                trap
+            ebb6:
+                jump ebb7
+            ebb7:
+                return
+        }
+    ", vec![0, 1, 2, 5, 4, 3, 6, 7]);
+}
+
+#[test]
+fn back_edge_one() {
+    test_reverse_postorder_traversal("
+        function test(i32) {
+            ebb0(v0: i32):
+                brz v0, ebb1
+                jump ebb2
+            ebb1:
+                jump ebb3
+            ebb2:
+                brz v0, ebb0
+                jump ebb4
+            ebb3:
+                brz v0, ebb2
+                brnz v0, ebb0
+                return
+            ebb4:
+                trap
+        }
+    ", vec![0, 1, 3, 2, 4]);
+}