From be2cbccf003d110cad00317090072788021efa56 Mon Sep 17 00:00:00 2001
From: Kyle Farnung <kfarnung@microsoft.com>
Date: Mon, 22 Jan 2018 11:43:35 -0800
Subject: http2,perf_hooks: perf state using AliasedBuffer

Update performance_state to use AliasedBuffer and update usage sites.

PR-URL: https://github.com/nodejs/node/pull/18300
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 src/node_perf_common.h | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

(limited to 'src/node_perf_common.h')

diff --git a/src/node_perf_common.h b/src/node_perf_common.h
index 713f126d7f7..435a4cffe5a 100644
--- a/src/node_perf_common.h
+++ b/src/node_perf_common.h
@@ -61,10 +61,33 @@ enum PerformanceEntryType {
                          node::performance::NODE_PERFORMANCE_MILESTONE_##n);  \
   } while (0);
 
-struct performance_state {
-  // doubles first so that they are always sizeof(double)-aligned
-  double milestones[NODE_PERFORMANCE_MILESTONE_INVALID];
-  uint32_t observers[NODE_PERFORMANCE_ENTRY_TYPE_INVALID];
+class performance_state {
+ public:
+  explicit performance_state(v8::Isolate* isolate) :
+    root(
+      isolate,
+      sizeof(performance_state_internal)),
+    milestones(
+      isolate,
+      offsetof(performance_state_internal, milestones),
+      NODE_PERFORMANCE_MILESTONE_INVALID,
+      root),
+    observers(
+      isolate,
+      offsetof(performance_state_internal, observers),
+      NODE_PERFORMANCE_ENTRY_TYPE_INVALID,
+      root) {}
+
+  AliasedBuffer<uint8_t, v8::Uint8Array> root;
+  AliasedBuffer<double, v8::Float64Array> milestones;
+  AliasedBuffer<uint32_t, v8::Uint32Array> observers;
+
+ private:
+  struct performance_state_internal {
+    // doubles first so that they are always sizeof(double)-aligned
+    double milestones[NODE_PERFORMANCE_MILESTONE_INVALID];
+    uint32_t observers[NODE_PERFORMANCE_ENTRY_TYPE_INVALID];
+  };
 };
 
 }  // namespace performance
-- 
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