forked from github/verilator
8814111724
Rework Ast hashing to be stable Eliminated reliance on pointer values in AstNode hashes in order to make them stable. This requires moving the sameHash functions into a visitor, as nodes pointed to via members (and not child nodes) need to be hashed themselves. The hashes are now stable (as far as I could test them), and the impact on verilation time is small enough not to be reliably measurable.
79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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// DESCRIPTION: Verilator: Hash AST trees to find duplicates
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//
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// Code available from: https://verilator.org
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//
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//*************************************************************************
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//
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// Copyright 2005-2021 by Wilson Snyder. This program is free software; you
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// can redistribute it and/or modify it under the terms of either the GNU
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// Lesser General Public License Version 3 or the Perl Artistic License
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// Version 2.0.
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// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
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//
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//*************************************************************************
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//
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// Datastructure for finding duplicate AstNode trees via hashing
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//
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//*************************************************************************
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#ifndef VERILATOR_V3DUPFINDER_H_
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#define VERILATOR_V3DUPFINDER_H_
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#include "config_build.h"
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#include "verilatedos.h"
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#include "V3Error.h"
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#include "V3Ast.h"
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#include "V3Hasher.h"
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#include <map>
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//============================================================================
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struct V3DupFinderUserSame {
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// Functor for V3DupFinder::findDuplicate
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virtual bool isSame(AstNode*, AstNode*) = 0;
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V3DupFinderUserSame() = default;
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virtual ~V3DupFinderUserSame() = default;
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};
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// This really is just a multimap from 'node hash' to 'node pointer', with some minor extensions.
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class V3DupFinder final : private std::multimap<V3Hash, AstNode*> {
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using Super = std::multimap<V3Hash, AstNode*>;
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// MEMBERS
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const V3Hasher m_hasher;
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public:
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// CONSTRUCTORS
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V3DupFinder(){};
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~V3DupFinder() = default;
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// METHODS
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VL_DEBUG_FUNC; // Declare debug()
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// Expose minimal set of superclass interface
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using Super::begin;
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using Super::cbegin;
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using Super::cend;
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using Super::clear;
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using Super::const_iterator;
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using Super::empty;
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using Super::end;
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using Super::erase;
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using Super::iterator;
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// Insert node into data structure
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iterator insert(AstNode* nodep) { return emplace(m_hasher(nodep), nodep); }
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// Return duplicate, if one was inserted, with optional user check for sameness
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iterator findDuplicate(AstNode* nodep, V3DupFinderUserSame* checkp = nullptr);
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// Dump for debug
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void dumpFile(const string& filename, bool tree);
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void dumpFilePrefixed(const string& nameComment, bool tree = false);
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};
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#endif // Guard
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