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Original commit message:
Merged: [map] Try to in-place transition during map update
When searching for a target map during map update, attempt to
update field representations in-place to the more general
representation, where possible.
Bug: chromium:1143772
No-Try: true
No-Presubmit: true
No-Tree-Checks: true
TBR=leszeks@chromium.org, fgm@chromium.org
(cherry picked from commit 8e3ae62d294818733a0322d8e8abd53d4e410f19)
Change-Id: I659890c2f08c14d1cf94242fb875c19837df2dbb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2509599
Reviewed-by: Francis McCabe <fgm@chromium.org>
Reviewed-by: Michael Hablich <hablich@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/branch-heads/8.6@{nodejs#44}
Cr-Branched-From: a64aed2333abf49e494d2a5ce24bbd14fff19f60-refs/heads/8.6.395@{#1}
Cr-Branched-From: a626bc036236c9bf92ac7b87dc40c9e538b087e3-refs/heads/master@{#69472}
Refs: v8/v8@3ba21a1- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| // Copyright 2020 the V8 project authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
| // | ||
| // Flags: --allow-natives-syntax | ||
|
|
||
| (function() { | ||
| // Only run this test if doubles are transitioned in-place to tagged. | ||
| let x = {}; | ||
| x.a = 0.1; | ||
| let y = {}; | ||
| y.a = {}; | ||
| if (!%HaveSameMap(x, y)) return; | ||
|
|
||
| // m1: {} | ||
| let m1 = {}; | ||
|
|
||
| // m2: {a:d} | ||
| let m2 = {}; | ||
| assertTrue(%HaveSameMap(m2, m1)); | ||
| m2.a = 13.37; | ||
|
|
||
| // m3: {a:d, b:s} | ||
| let m3 = {}; | ||
| m3.a = 13.37; | ||
| assertTrue(%HaveSameMap(m3, m2)); | ||
| m3.b = 1; | ||
|
|
||
| // m4: {a:d, b:s, c:h} | ||
| let m4 = {}; | ||
| m4.a = 13.37; | ||
| m4.b = 1; | ||
| assertTrue(%HaveSameMap(m4, m3)); | ||
| m4.c = {}; | ||
|
|
||
| // m4_2 == m4 | ||
| let m4_2 = {}; | ||
| m4_2.a = 13.37; | ||
| m4_2.b = 1; | ||
| m4_2.c = {}; | ||
| assertTrue(%HaveSameMap(m4_2, m4)); | ||
|
|
||
| // m5: {a:d, b:d} | ||
| let m5 = {}; | ||
| m5.a = 13.37; | ||
| assertTrue(%HaveSameMap(m5, m2)); | ||
| m5.b = 13.37; | ||
| assertFalse(%HaveSameMap(m5, m3)); | ||
|
|
||
| // At this point, Map3 and Map4 are both deprecated. Map2 transitions to | ||
| // Map5. Map5 is the migration target for Map3. | ||
| assertFalse(%HaveSameMap(m5, m3)); | ||
|
|
||
| // m6: {a:d, b:d, c:d} | ||
| let m6 = {}; | ||
| m6.a = 13.37; | ||
| assertTrue(%HaveSameMap(m6, m2)); | ||
| m6.b = 13.37; | ||
| assertTrue(%HaveSameMap(m6, m5)); | ||
| m6.c = 13.37 | ||
|
|
||
| // Make m7: {a:d, b:d, c:t} | ||
| let m7 = m4_2; | ||
| assertTrue(%HaveSameMap(m7, m4)); | ||
| // Map4 is deprecated, so this property access triggers a Map migration. | ||
| // With in-place map updates and no double unboxing, this should end up | ||
| // migrating to Map6, and updating it in-place. | ||
| m7.c; | ||
| assertFalse(%HaveSameMap(m7, m4)); | ||
| assertTrue(%HaveSameMap(m6, m7)); | ||
| })(); |