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Instrument module init in DEV (#1787)

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dan 2023-11-01 15:31:33 +00:00 • committed by GitHub
parent adb5ce2961
commit 85c26fb5a8
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@ -0,0 +1,50 @@
diff --git a/node_modules/metro-runtime/src/polyfills/require.js b/node_modules/metro-runtime/src/polyfills/require.js
index ce67cb4..eeeae84 100644
--- a/node_modules/metro-runtime/src/polyfills/require.js
+++ b/node_modules/metro-runtime/src/polyfills/require.js
@@ -22,6 +22,13 @@ global.__c = clear;
global.__registerSegment = registerSegment;
var modules = clear();
+if (__DEV__) {
+ // Added by Dan for module init logging.
+ global.__INIT_LOGS__ = []
+ var initModuleCounter = 0
+ var initModuleStack = []
+}
+
// Don't use a Symbol here, it would pull in an extra polyfill with all sorts of
// additional stuff (e.g. Array.from).
const EMPTY = {};
@@ -303,7 +310,30 @@ function loadModuleImplementation(moduleId, module) {
throw module.error;
}
if (__DEV__) {
- var Systrace = requireSystrace();
+ // Added by Dan for module init logging.
+ var Systrace = {
+ beginEvent(label) {
+ let fullLabel = initModuleCounter++ + ' ' + label
+ global.__INIT_LOGS__.push(
+ ' '.repeat(initModuleStack.length) +
+ ' ENTER ' + fullLabel
+ )
+ initModuleStack.push({
+ fullLabel,
+ startTime: nativePerformanceNow(),
+ })
+ },
+ endEvent() {
+ const res = initModuleStack.pop()
+ const fullLabel = res.fullLabel
+ const startTime = res.startTime
+ const timeElapsed = Math.round(nativePerformanceNow() - startTime)
+ global.__INIT_LOGS__.push(
+ ' '.repeat(initModuleStack.length) +
+ ' LEAVE ' + fullLabel + ' [' + timeElapsed + 'ms]',
+ )
+ }
+ };
var Refresh = requireRefresh();
}