a02c56694f
This is a reland of commit 4804c4de31.
There are major changes since the previous attempt:
- The WasmLiftoffFrameSetup (formerly WasmGetFeedbackVector) builtin
now performs as much of the frame setup work as possible, to reduce
generated code size for each function.
- The WasmLazyCompile builtin/runtime function no longer allocates,
hence gets frame type INTERNAL, and is un-handlified.
Original change's description:
> [wasm] Allocate feedback vectors on demand
>
> We previously allocated feedback vectors when instantiating the module,
> or when lazily compiling a function. That's not sufficient when there
> are multiple instances of the same NativeModule, or when we eagerly
> tier-down all code for debugging. This patch changes the "get vector from
> instance" sequence at the beginning of every Liftoff function to "get
> or allocate vector"; factored into a builtin call to avoid generating
> more code for every function.
>
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3939667
> Cr-Commit-Position: refs/heads/main@{#83610}
Bug: v8:12852
Change-Id: I58a6a02a55c3e29cae3cbdafad6cf81487faccbe
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3942206
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83794}
22 lines
674 B
JavaScript
22 lines
674 B
JavaScript
// Copyright 2022 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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// Flags: --wasm-lazy-compilation --wasm-speculative-inlining
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d8.file.execute("test/mjsunit/wasm/wasm-module-builder.js");
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let builder = new WasmModuleBuilder();
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let callee = builder.addFunction('callee', kSig_v_v).addBody([]);
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builder.addFunction('main', kSig_v_v).exportFunc().addBody([
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kExprCallFunction, callee.index,
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]);
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let inst1 = builder.instantiate();
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let inst2 = builder.instantiate();
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inst1.exports.main(); // Triggers lazy compilation.
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inst2.exports.main(); // Lacks feedback vector.
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