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deps/v8/src/compiler/graph-trimmer.cc
47 строк
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Michaël Zasso
deps: update V8 to 13.6.233.8
02 май 2025, 16:06
Не верифицирован
02 май 2025, 16:06
918fe04
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// Copyright 2015 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. #include "src/compiler/graph-trimmer.h" #include "src/compiler/turbofan-graph.h" namespace v8 { namespace internal { namespace compiler { GraphTrimmer::GraphTrimmer(Zone* zone, TFGraph* graph) : graph_(graph), is_live_(graph, 2), live_(zone) { live_.reserve(graph->NodeCount()); } GraphTrimmer::~GraphTrimmer() = default; void GraphTrimmer::TrimGraph() { // Mark end node as live. MarkAsLive(graph()->end()); // Compute transitive closure of live nodes. for (size_t i = 0; i < live_.size(); ++i) { Node* const live = live_[i]; for (Node* const input : live->inputs()) MarkAsLive(input); } // Remove dead->live edges. for (Node* const live : live_) { DCHECK(IsLive(live)); for (Edge edge : live->use_edges()) { Node* const user = edge.from(); if (!IsLive(user)) { if (v8_flags.trace_turbo_trimming) { StdoutStream{} << "DeadLink: " << *user << "(" << edge.index() << ") -> " << *live << std::endl; } edge.UpdateTo(nullptr); } } } } } // namespace compiler } // namespace internal } // namespace v8