move files over

compiler/test_wasm/src/helpers/mod.rs

@@ -0,0 +1,43 @@
+#[macro_use]
+pub mod eval;
+pub mod wasm32_test_result;
+
+/// Used in the with_larger_debug_stack() function, for tests that otherwise
+/// run out of stack space in debug builds (but don't in --release builds)
+#[allow(dead_code)]
+const EXPANDED_STACK_SIZE: usize = 8 * 1024 * 1024;
+
+/// Without this, some tests pass in `cargo test --release` but fail without
+/// the --release flag because they run out of stack space. This increases
+/// stack size for debug builds only, while leaving the stack space at the default
+/// amount for release builds.
+#[allow(dead_code)]
+#[cfg(debug_assertions)]
+pub fn with_larger_debug_stack<F>(run_test: F)
+where
+    F: FnOnce(),
+    F: Send,
+    F: 'static,
+{
+    std::thread::Builder::new()
+        .stack_size(EXPANDED_STACK_SIZE)
+        .spawn(run_test)
+        .expect("Error while spawning expanded dev stack size thread")
+        .join()
+        .expect("Error while joining expanded dev stack size thread")
+}
+
+/// In --release builds, don't increase the stack size. Run the test normally.
+/// This way, we find out if any of our tests are blowing the stack even after
+/// optimizations in release builds.
+#[allow(dead_code)]
+#[cfg(not(debug_assertions))]
+#[inline(always)]
+pub fn with_larger_debug_stack<F>(run_test: F)
+where
+    F: FnOnce() -> (),
+    F: Send,
+    F: 'static,
+{
+    run_test()
+}