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JSSpecCompiler: Add bare-bones DCE pass

Right now the only dead code it eliminates is the unused phi nodes.
This commit is contained in:
Dan Klishch 2023-08-29 15:47:39 -04:00 committed by Andrew Kaster
parent 162c334508
commit 5338cdd153
6 changed files with 286 additions and 0 deletions

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/*
* Copyright (c) 2023, Dan Klishch <danilklishch@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "Compiler/EnableGraphPointers.h"
#include "Compiler/GenericASTPass.h"
#include "Compiler/StronglyConnectedComponents.h"
namespace JSSpecCompiler {
class DeadCodeEliminationPass
: public IntraproceduralCompilerPass
, private RecursiveASTVisitor
, private EnableGraphPointers<DeadCodeEliminationPass, SSAVariableDeclarationRef> {
public:
inline static constexpr StringView name = "dce"sv;
using IntraproceduralCompilerPass::IntraproceduralCompilerPass;
protected:
void process_function() override;
private:
friend EnableGraphPointers;
static Vertex as_vertex(Variable* variable);
RecursionDecision on_entry(Tree tree) override;
void on_leave(Tree tree) override;
void remove_unused_phi_nodes();
struct NodeData {
Vector<Vertex> outgoing_edges;
Vector<Vertex> incoming_edges;
bool is_referenced = false;
};
Vector<NodeData> m_nodes;
};
}