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Assert empty JS heap/stack in tests

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Turns out there was a bug when passing a vector of `JsValue` instances back to
JS all objects were leaked rather than correctly removed from the global slab.
This commit is contained in:
Alex Crichton
2018-04-25 22:14:15 -07:00
parent faed98b843
commit d9a71b43db
4 changed files with 38 additions and 4 deletions
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24
crates/cli-support/src/js/mod.rs
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@ -633,6 +633,15 @@ impl<'a> Context<'a> {
self.global(&format!("
let stack = [];
"));
if self.config.debug {
self.export("assertStackEmpty", "
function() {
if (stack.length === 0)
return;
throw new Error('stack is not currently empty');
}
");
}
}
fn expose_global_slab(&mut self) {
@ -640,6 +649,17 @@ impl<'a> Context<'a> {
return;
}
self.global(&format!("let slab = [];"));
if self.config.debug {
self.export("assertSlabEmpty", "
function() {
for (let i = 0; i < slab.length; i++) {
if (typeof(slab[i]) === 'number')
continue;
throw new Error('slab is not currently empty');
}
}
");
}
}
fn expose_global_slab_next(&mut self) {
@ -882,14 +902,14 @@ impl<'a> Context<'a> {
return;
}
self.expose_get_array_u32_from_wasm();
self.expose_get_object();
self.expose_take_object();
self.global(&format!("
function getArrayJsValueFromWasm(ptr, len) {{
const mem = getUint32Memory();
const slice = mem.slice(ptr / 4, ptr / 4 + len);
const result = [];
for (let i = 0; i < slice.length; i++) {{
result.push(getObject(slice[i]))
result.push(takeObject(slice[i]))
}}
return result;
}}