Add switch tests (#28)

This adds switch/case tests.

Not all tests compile, but that's fine, they will be fixed in future
PR's. Some tests are marked with the new

```cpp
// translation-fail
```

marker that's aded to tests which break the translator

Author: lucic71

tests/lit/lit/formats/Cpp2RustTest.py

@@ -26,6 +26,7 @@ def __init__(self):
     self.regex_xfail = re.compile(r"//\s*XFAIL:\s*(.*)")
     self.regex_panic = re.compile(r"//\s*panic\s*(?::\s*(.*))?$", re.MULTILINE)
     self.regex_nocompile = re.compile(r"//\s*no-compile\s*(?::\s*(.*))?$", re.MULTILINE)
+    self.regex_translation_fail = re.compile(r"//\s*translation-fail\s*(?::\s*(.*))?$", re.MULTILINE)
     self.regex_nondet_result = re.compile(r"//\s*nondet-result\s*(?::\s*(.*))?$", re.MULTILINE)
     self.rust_version = read_rust_version()
     os.environ['RUSTFLAGS'] = '-Awarnings -A dangerous-implicit-autorefs'
@@ -83,6 +84,7 @@ def matches_model(match, model):
 
     should_panic = matches_model(self.regex_panic.search(text), model)
     should_not_compile = matches_model(self.regex_nocompile.search(text), model)
+    should_not_translate = matches_model(self.regex_translation_fail.search(text), model)
     is_nondet_result = matches_model(self.regex_nondet_result.search(text), model)
 
     tmp_dir = "tmp/" + fname + "-" + model + "_" + format(random.getrandbits(64), "x")
@@ -94,10 +96,6 @@ def fail(str, code = fail_code):
       shutil.rmtree(tmp_dir, True)
       return code, str
 
-    expected_file = self.getExpectedFile(filepath, model, fname)
-    if not os.path.exists(expected_file) and not replace_expected:
-      return fail('no expected file')
-
     cmd = ['./cpp2rust/cpp2rust', '-file', cc_input, '-model', model,
            '-o', rs_file]
 
@@ -113,8 +111,14 @@ def fail(str, code = fail_code):
       generated = f.read()
 
     if returncode != 0:
+      if should_not_translate:
+        return lit.Test.XFAIL, ''
       return fail('cpp2rust failed\n' + err)
 
+    expected_file = self.getExpectedFile(filepath, model, fname)
+    if not os.path.exists(expected_file) and not replace_expected:
+      return fail('no expected file')
+
     if replace_expected:
       self.updateExpected(generated, expected_file)
 

tests/unit/out/refcount/switch_basic.rs

@@ -0,0 +1,58 @@
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::cell::RefCell;
+use std::collections::BTreeMap;
+use std::io::prelude::*;
+use std::io::{Read, Seek, Write};
+use std::os::fd::AsFd;
+use std::rc::{Rc, Weak};
+pub fn basic_0(x: i32) -> i32 {
+    let x: Value<i32> = Rc::new(RefCell::new(x));
+    let r: Value<i32> = Rc::new(RefCell::new(0));
+    'switch: {
+        let __match_cond = (*x.borrow());
+        match __match_cond {
+            v if v == 0 => {
+                (*r.borrow_mut()) = 10;
+                break 'switch;
+            }
+            v if v == 1 => {
+                (*r.borrow_mut()) = 20;
+                break 'switch;
+            }
+            v if v == 2 => {
+                (*r.borrow_mut()) = 30;
+                break 'switch;
+            }
+            _ => {
+                (*r.borrow_mut()) = 40;
+                break 'switch;
+            }
+        }
+    };
+    return (*r.borrow());
+}
+pub fn main() {
+    std::process::exit(main_0());
+}
+fn main_0() -> i32 {
+    assert!(
+        (({
+            let _x: i32 = 0;
+            basic_0(_x)
+        }) == 10)
+    );
+    assert!(
+        (({
+            let _x: i32 = 2;
+            basic_0(_x)
+        }) == 30)
+    );
+    assert!(
+        (({
+            let _x: i32 = 99;
+            basic_0(_x)
+        }) == 40)
+    );
+    return 0;
+}

tests/unit/out/refcount/switch_borrow_in_condition_and_in_body.rs

@@ -0,0 +1,39 @@
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::cell::RefCell;
+use std::collections::BTreeMap;
+use std::io::prelude::*;
+use std::io::{Read, Seek, Write};
+use std::os::fd::AsFd;
+use std::rc::{Rc, Weak};
+pub fn borrow_in_condition_and_in_body_0(x: i32) -> i32 {
+    let x: Value<i32> = Rc::new(RefCell::new(x));
+    'switch: {
+        let __match_cond = (*x.borrow());
+        match __match_cond {
+            v if v == 0 => {}
+            _ => {
+                return ((*x.borrow()) + 1);
+            }
+        }
+    };
+    panic!("ub: non-void function does not return a value")
+}
+pub fn main() {
+    std::process::exit(main_0());
+}
+fn main_0() -> i32 {
+    assert!(
+        (({
+            let _x: i32 = 0;
+            borrow_in_condition_and_in_body_0(_x)
+        }) == 1)
+    );
+    assert!(
+        (({
+            let _x: i32 = 1;
+            borrow_in_condition_and_in_body_0(_x)
+        }) == 2)
+    );
+    return 0;
+}

tests/unit/out/refcount/switch_char.rs

@@ -0,0 +1,75 @@
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::cell::RefCell;
+use std::collections::BTreeMap;
+use std::io::prelude::*;
+use std::io::{Read, Seek, Write};
+use std::os::fd::AsFd;
+use std::rc::{Rc, Weak};
+pub fn switch_char_0(c: u8) -> i32 {
+    let c: Value<u8> = Rc::new(RefCell::new(c));
+    'switch: {
+        let __match_cond = ((*c.borrow()) as i32);
+        match __match_cond {
+            v if v == (('a' as u8) as i32) => {
+                return 1;
+            }
+            v if v == (('b' as u8) as i32) => {
+                return 2;
+            }
+            v if v == (('\n' as u8) as i32) => {
+                return 3;
+            }
+            v if v == (('\0' as u8) as i32) => {
+                return 4;
+            }
+            _ => {
+                return 0;
+            }
+        }
+    };
+    panic!("ub: non-void function does not return a value")
+}
+#[derive(Clone, Copy, PartialEq, Debug, Default)]
+enum Color {
+    #[default]
+    kRed = 0,
+    kGreen = 1,
+    kBlue = 2,
+}
+pub fn main() {
+    std::process::exit(main_0());
+}
+fn main_0() -> i32 {
+    assert!(
+        (({
+            let _c: u8 = ('a' as u8);
+            switch_char_0(_c)
+        }) == 1)
+    );
+    assert!(
+        (({
+            let _c: u8 = ('b' as u8);
+            switch_char_0(_c)
+        }) == 2)
+    );
+    assert!(
+        (({
+            let _c: u8 = ('\n' as u8);
+            switch_char_0(_c)
+        }) == 3)
+    );
+    assert!(
+        (({
+            let _c: u8 = ('\0' as u8);
+            switch_char_0(_c)
+        }) == 4)
+    );
+    assert!(
+        (({
+            let _c: u8 = ('z' as u8);
+            switch_char_0(_c)
+        }) == 0)
+    );
+    return 0;
+}

tests/unit/out/refcount/switch_complex_cond.rs

@@ -0,0 +1,68 @@
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::cell::RefCell;
+use std::collections::BTreeMap;
+use std::io::prelude::*;
+use std::io::{Read, Seek, Write};
+use std::os::fd::AsFd;
+use std::rc::{Rc, Weak};
+pub fn switch_complex_cond_0(p: Ptr<i32>, bias: i32) -> i32 {
+    let p: Value<Ptr<i32>> = Rc::new(RefCell::new(p));
+    let bias: Value<i32> = Rc::new(RefCell::new(bias));
+    'switch: {
+        let __match_cond = {
+            let _lhs = ((*p.borrow()).read());
+            _lhs + (*bias.borrow())
+        };
+        match __match_cond {
+            v if v == 0 => {
+                return 1;
+            }
+            v if v == 5 => {
+                return 2;
+            }
+            v if v == 10 => {
+                return 3;
+            }
+            _ => {
+                return 0;
+            }
+        }
+    };
+    panic!("ub: non-void function does not return a value")
+}
+pub fn main() {
+    std::process::exit(main_0());
+}
+fn main_0() -> i32 {
+    let p_val: Value<i32> = Rc::new(RefCell::new(5));
+    assert!(
+        (({
+            let _p: Ptr<i32> = (p_val.as_pointer());
+            let _bias: i32 = 0;
+            switch_complex_cond_0(_p, _bias)
+        }) == 2)
+    );
+    assert!(
+        (({
+            let _p: Ptr<i32> = (p_val.as_pointer());
+            let _bias: i32 = 5;
+            switch_complex_cond_0(_p, _bias)
+        }) == 3)
+    );
+    assert!(
+        (({
+            let _p: Ptr<i32> = (p_val.as_pointer());
+            let _bias: i32 = -5_i32;
+            switch_complex_cond_0(_p, _bias)
+        }) == 1)
+    );
+    assert!(
+        (({
+            let _p: Ptr<i32> = (p_val.as_pointer());
+            let _bias: i32 = 99;
+            switch_complex_cond_0(_p, _bias)
+        }) == 0)
+    );
+    return 0;
+}

tests/unit/out/refcount/switch_compound_case_body.rs

@@ -0,0 +1,57 @@
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::cell::RefCell;
+use std::collections::BTreeMap;
+use std::io::prelude::*;
+use std::io::{Read, Seek, Write};
+use std::os::fd::AsFd;
+use std::rc::{Rc, Weak};
+pub fn compound_case_body_0(x: i32) -> i32 {
+    let x: Value<i32> = Rc::new(RefCell::new(x));
+    let r: Value<i32> = Rc::new(RefCell::new(0));
+    'switch: {
+        let __match_cond = (*x.borrow());
+        match __match_cond {
+            v if v == 1 => {
+                let y: Value<i32> = Rc::new(RefCell::new(10));
+                let z: Value<i32> = Rc::new(RefCell::new(20));
+                (*r.borrow_mut()) = ((*y.borrow()) + (*z.borrow()));
+                break 'switch;
+            }
+            v if v == 2 => {
+                let y: Value<i32> = Rc::new(RefCell::new(100));
+                (*r.borrow_mut()) = ((*y.borrow()) - 1);
+                break 'switch;
+            }
+            _ => {
+                (*r.borrow_mut()) = -1_i32;
+                break 'switch;
+            }
+        }
+    };
+    return (*r.borrow());
+}
+pub fn main() {
+    std::process::exit(main_0());
+}
+fn main_0() -> i32 {
+    assert!(
+        (({
+            let _x: i32 = 1;
+            compound_case_body_0(_x)
+        }) == 30)
+    );
+    assert!(
+        (({
+            let _x: i32 = 2;
+            compound_case_body_0(_x)
+        }) == 99)
+    );
+    assert!(
+        (({
+            let _x: i32 = 9;
+            compound_case_body_0(_x)
+        }) == -1_i32)
+    );
+    return 0;
+}

tests/unit/out/refcount/switch_continue_inside_switch.rs

@@ -0,0 +1,43 @@
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::cell::RefCell;
+use std::collections::BTreeMap;
+use std::io::prelude::*;
+use std::io::{Read, Seek, Write};
+use std::os::fd::AsFd;
+use std::rc::{Rc, Weak};
+pub fn continue_inside_switch_0(n: i32) -> i32 {
+    let n: Value<i32> = Rc::new(RefCell::new(n));
+    let r: Value<i32> = Rc::new(RefCell::new(0));
+    let i: Value<i32> = Rc::new(RefCell::new(0));
+    'loop_: while ((*i.borrow()) < (*n.borrow())) {
+        'switch: {
+            let __match_cond = (*i.borrow());
+            match __match_cond {
+                v if v == 0 || v == 2 || v == 4 => {
+                    (*i.borrow_mut()).prefix_inc();
+                    continue 'loop_;
+                }
+                _ => {
+                    (*r.borrow_mut()) += (*i.borrow());
+                    break 'switch;
+                }
+            }
+        };
+        (*r.borrow_mut()) += 1000;
+        (*i.borrow_mut()).prefix_inc();
+    }
+    return (*r.borrow());
+}
+pub fn main() {
+    std::process::exit(main_0());
+}
+fn main_0() -> i32 {
+    assert!(
+        (({
+            let _n: i32 = 6;
+            continue_inside_switch_0(_n)
+        }) == ((((1 + 3) + 5) as i32) + (3 * 1000)))
+    );
+    return 0;
+}