b6b7de0d60
This reverts commit9da3483136Original change's description: > "Reland x4 [arraybuffer] Rearchitect backing store ownership" > > This is a reland ofbc33f5aeba> > Contributed by titzer@chromium.org > > Original change's description: > > [arraybuffer] Rearchitect backing store ownership > > > > This CL completely rearchitects the ownership of array buffer backing stores, > > consolidating ownership into a {BackingStore} C++ object that is tracked > > throughout V8 using unique_ptr and shared_ptr where appropriate. > > > > Overall, lifetime management is simpler and more explicit. The numerous > > ways that array buffers were initialized have been streamlined to one > > Attach() method on JSArrayBuffer. The array buffer tracker in the > > GC implementation now manages std::shared_ptr<BackingStore> pointers, > > and the construction and destruction of the BackingStore object itself > > handles the underlying page or embedder-allocated memory. > > > > The embedder API remains unchanged for now. We use the > > v8::ArrayBuffer::Contents struct to hide an additional shared_ptr to > > keep the backing store alive properly, even in the case of aliases > > from live heap objects. Thus the embedder has a lower chance of making > > a mistake. Long-term, we should move the embedder to a model where they > > manage backing stores using shared_ptr to an opaque backing store object. > > TBR=yangguo@chromium.org > > BUG=v8:9380,v8:9221,chromium:986318 > > Change-Id: If671a4a9ca0476e8f084efae46e0d2bf99ed99ef > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1731005 > Commit-Queue: Ulan Degenbaev <ulan@chromium.org> > Reviewed-by: Clemens Hammacher <clemensh@chromium.org> > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> > Cr-Commit-Position: refs/heads/master@{#63041} TBR=yangguo@chromium.org Change-Id: I3cc4bb80081c662b1751234bc16a821c20e744be Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1792166 Commit-Queue: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#63617}
42 lines
945 B
JavaScript
42 lines
945 B
JavaScript
// Copyright 2019 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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let kPageSize = 65536;
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function allocMems(count, initial, maximum) {
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print(`alloc ${count}`);
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let result = [];
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for (let i = 0; i < count; i++) {
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print(` memory #${i} (initial=${initial}, maximum=${maximum})...`);
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result.push(new WebAssembly.Memory({initial: initial, maximum: maximum}));
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}
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return result;
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}
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function check(mems, initial) {
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for (m of mems) {
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assertEquals(initial * kPageSize, m.buffer.byteLength);
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}
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}
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function test(count, initial, maximum) {
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let mems = allocMems(count, initial, maximum);
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check(mems, initial);
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}
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test(1, 1, 1);
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test(1, 1, 2);
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test(1, 1, 3);
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test(1, 1, 4);
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test(2, 1, 1);
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test(2, 1, 2);
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test(2, 1, 3);
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test(2, 1, 4);
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test(1, 1, undefined);
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test(2, 1, undefined);
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test(3, 1, undefined);
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test(4, 1, undefined);
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