1 files changed, 80 insertions, 0 deletions
diff --git a/js/src/jit-test/lib/pretenure.js b/js/src/jit-test/lib/pretenure.js
new file mode 100644
index 0000000000..85282680c0
--- /dev/null
+++ b/js/src/jit-test/lib/pretenure.js
@@ -0,0 +1,80 @@
+// Functions shared by gc/pretenure-*.js tests
+
+const is64bit = getBuildConfiguration()['pointer-byte-size'] === 8;
+
+// Count of objects that will exceed the size of the nursery.
+const nurseryCount = is64bit ? 25000 : 50000;
+
+// Count of objects that will exceed the tenured heap collection threshold.
+const tenuredCount = is64bit ? 300000 : 600000;
+
+function setupPretenureTest() {
+  // The test requires that baseline is enabled and is not bypassed with
+  // --ion-eager or similar.
+  let jitOptions = getJitCompilerOptions();
+  if (!jitOptions['baseline.enable'] ||
+      jitOptions['ion.warmup.trigger'] <= jitOptions['baseline.warmup.trigger']) {
+    print("Unsupported JIT options");
+    quit();
+  }
+
+  // Disable zeal modes that will interfere with this test.
+  gczeal(0);
+
+  // Restrict nursery size so we can fill it quicker, and ensure it is resized.
+  gcparam("minNurseryBytes", 1024 * 1024);
+  gcparam("maxNurseryBytes", 1024 * 1024);
+
+  // Limit allocation threshold so we trigger major GCs sooner.
+  gcparam("allocationThreshold", 1 /* MB */);
+
+  // Disable incremental GC so there's at most one minor GC per major GC.
+  gcparam("incrementalGCEnabled", false);
+
+  // Disable balanced heap limits to make the number of GCs predictable.
+  gcparam("balancedHeapLimitsEnabled", false);
+
+  // Force a nursery collection to apply size parameters.
+  let o = {};
+
+  gc();
+}
+
+function allocateObjects(count, longLived) {
+  let array = new Array(nurseryCount);
+  for (let i = 0; i < count; i++) {
+    let x = {x: i};
+    if (longLived) {
+      array[i % nurseryCount] = x;
+    } else {
+      array[0] = x;
+    }
+  }
+  return array;
+}
+
+function allocateArrays(count, longLived) {
+  let array = new Array(nurseryCount);
+  for (let i = 0; i < count; i++) {
+    let x = [i];
+    if (longLived) {
+      array[i % nurseryCount] = x;
+    } else {
+      array[0] = x;
+    }
+  }
+  return array;
+}
+
+function gcCounts() {
+  return { minor: gcparam("minorGCNumber"),
+           major: gcparam("majorGCNumber") };
+}
+
+function runTestAndCountCollections(thunk) {
+  let initialCounts = gcCounts();
+  thunk();
+  let finalCounts = gcCounts();
+  return { minor: finalCounts.minor - initialCounts.minor,
+           major: finalCounts.major - initialCounts.major };
+}