Check in the wasmstandalone code.

This is based on the code in https://github.com/denismerigoux/cretonne/commits/wasm2cretonne
before wasmstandalone was removed, with minor updates for the new library structure.
It is not yet updated for the latest cretonne API changes.

tests/cfg_traversal.rs

@@ -1,150 +0,0 @@
-extern crate cretonne;
-extern crate cton_reader;
-
-use self::cretonne::flowgraph::ControlFlowGraph;
-use self::cretonne::dominator_tree::DominatorTree;
-use self::cretonne::ir::Ebb;
-use self::cton_reader::parse_functions;
-
-fn test_reverse_postorder_traversal(function_source: &str, ebb_order: Vec<u32>) {
-    let func = &parse_functions(function_source).unwrap()[0];
-    let cfg = ControlFlowGraph::with_function(&func);
-    let domtree = DominatorTree::with_function(&func, &cfg);
-
-    let got = domtree
-        .cfg_postorder()
-        .iter()
-        .rev()
-        .cloned()
-        .collect::<Vec<_>>();
-    let want = ebb_order
-        .iter()
-        .map(|&n| Ebb::with_number(n).unwrap())
-        .collect::<Vec<_>>();
-    assert_eq!(got, want);
-}
-
-#[test]
-fn simple_traversal() {
-    test_reverse_postorder_traversal("
-        function %test(i32) native {
-            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, 1, 3, 2, 4, 5]);
-}
-
-#[test]
-fn loops_one() {
-    test_reverse_postorder_traversal("
-        function %test(i32) native {
-            ebb0(v0: i32):
-                jump ebb1
-            ebb1:
-                brnz v0, ebb3
-                jump ebb2
-            ebb2:
-                jump ebb3
-            ebb3:
-                return
-        }
-    ",
-                                     vec![0, 1, 3, 2]);
-}
-
-#[test]
-fn loops_two() {
-    test_reverse_postorder_traversal("
-        function %test(i32) native {
-            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, 4, 3, 5]);
-}
-
-#[test]
-fn loops_three() {
-    test_reverse_postorder_traversal("
-        function %test(i32) native {
-            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, 4, 3, 6, 7, 5]);
-}
-
-#[test]
-fn back_edge_one() {
-    test_reverse_postorder_traversal("
-        function %test(i32) native {
-            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]);
-}