Use cargo features to toggle profiler

Cargo.toml

@@ -6,6 +6,10 @@ publish = false
 [dev-dependencies]
 quickcheck = "0.6.2"
 
+[features]
+default = []
+profiler = []
+
 [lib]
 crate-type = ["cdylib"]
 path = "src/rust/lib.rs"

src/rust/cpu2/profiler.rs

@@ -109,11 +109,18 @@ pub unsafe fn profiler_stat_increment(mut stat: stat_name) -> () {
 }
 #[no_mangle]
 pub unsafe fn profiler_stat_increment_by(mut stat: stat_name, mut by: i32) -> () {
-    profiler_stat_arr[stat as usize].count += by;
+    if cfg!(feature = "profiler") {
+        profiler_stat_arr[stat as usize].count += by;
+    }
 }
 #[no_mangle]
 pub unsafe fn profiler_stat_get(mut stat: stat_name) -> i32 {
-    return profiler_stat_arr[stat as usize].count;
+    if cfg!(feature = "profiler") {
+        profiler_stat_arr[stat as usize].count
+    }
+    else {
+        0
+    }
 }
 #[no_mangle]
 pub unsafe fn profiler_stat_increment_do_run() -> () { profiler_stat_increment(S_DO_RUN); }

src/rust/profiler.rs

@@ -49,15 +49,15 @@ pub enum stat {
     S_TLB_GLOBAL_FULL,
 }
 
-#[cfg(debug_assertions)]
+#[cfg(feature = "profiler")]
 mod unsafe_extern {
     extern "C" {
         pub fn profiler_stat_increment(stat: ::profiler::stat);
     }
 }
 
-#[cfg(debug_assertions)]
+#[cfg(feature = "profiler")]
 pub fn stat_increment(stat: stat) { unsafe { unsafe_extern::profiler_stat_increment(stat) } }
 
-#[cfg(not(debug_assertions))]
+#[cfg(not(feature = "profiler"))]
 pub fn stat_increment(_stat: stat) {}