f0645612c4
Unfortunately, even for an empty generator, we still use 8 register for various things (try-finally, copies of generator object, parser-introduced temporaries). I will try to get rid of these in separate CLs.
Changes:
- SuspendGenerator bytecode now takes register list to save.
- ResumeGenerator was split into two bytecodes:
* Resume generator reads the state out and marks the generator as
'executing'.
* RestoreGeneratorRegisters reloads the registers from
the generator.
+ this required adding support for output register list.
- Introduced generator_object_ register in the bytecode generator.
* in subsequent CLs, I will make better use of it, the goal is
to get rid if the .generator_object local variable.
- Taught register optimizer to flush unassigned registers.
BUG=v8:6379
Review-Url: https://codereview.chromium.org/2894293003
Cr-Commit-Position: refs/heads/master@{#45675}
16 lines
388 B
JavaScript
16 lines
388 B
JavaScript
// Copyright 2016 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: --allow-natives-syntax
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function* h() { try {yield 42} finally {yield 43} };
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function* g() { yield* h(); };
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let x = g();
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x.next();
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%OptimizeFunctionOnNextCall(g);
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x.throw(670);
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try { x.next() } catch (e) { }
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