forked from github/verilator
141 lines
4.5 KiB
C++
141 lines
4.5 KiB
C++
// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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// DESCRIPTION: Verilator: Prevent very deep expressions
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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 2003-2020 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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// V3DepthBlock's Transformations:
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//
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// Each module:
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// For each deep block, create cfunc including that block.
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//
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//*************************************************************************
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#include "config_build.h"
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#include "verilatedos.h"
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#include "V3Global.h"
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#include "V3DepthBlock.h"
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#include "V3Ast.h"
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#include "V3EmitCBase.h"
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#include <algorithm>
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//######################################################################
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class DepthBlockVisitor : public AstNVisitor {
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private:
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// NODE STATE
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// STATE
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AstNodeModule* m_modp; // Current module
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AstCFunc* m_funcp; // Current function
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int m_depth; // How deep in an expression
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int m_deepNum; // How many functions made
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// METHODS
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VL_DEBUG_FUNC; // Declare debug()
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AstCFunc* createDeepFunc(AstNode* nodep) {
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AstNRelinker relinkHandle;
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nodep->unlinkFrBack(&relinkHandle);
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// Create function
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string name = m_funcp->name() + "__deep" + cvtToStr(++m_deepNum);
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AstCFunc* funcp = new AstCFunc(nodep->fileline(), name, nullptr);
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funcp->argTypes(EmitCBaseVisitor::symClassVar());
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funcp->symProlog(true);
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funcp->slow(m_funcp->slow());
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funcp->addStmtsp(nodep);
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m_modp->addStmtp(funcp);
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// Call it at the point where the body was removed from
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AstCCall* callp = new AstCCall(nodep->fileline(), funcp);
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callp->argTypes("vlSymsp");
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UINFO(6, " New " << callp << endl);
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//
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relinkHandle.relink(callp);
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return funcp;
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}
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// VISITORS
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virtual void visit(AstNodeModule* nodep) override {
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UINFO(4, " MOD " << nodep << endl);
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AstNodeModule* origModp = m_modp;
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{
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m_modp = nodep;
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m_deepNum = 0;
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iterateChildren(nodep);
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}
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m_modp = origModp;
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}
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virtual void visit(AstCFunc* nodep) override {
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// We recurse into this.
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int lastDepth = m_depth;
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AstCFunc* lastFuncp = m_funcp;
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{
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m_depth = 0;
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m_funcp = nodep;
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iterateChildren(nodep);
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}
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m_depth = lastDepth;
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m_funcp = lastFuncp;
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}
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void visitStmt(AstNodeStmt* nodep) {
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m_depth++;
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if (m_depth > v3Global.opt.compLimitBlocks()
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&& !VN_IS(nodep, NodeCCall)) { // Already done
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UINFO(4, "DeepBlocks " << m_depth << " " << nodep << endl);
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AstNode* backp = nodep->backp(); // Only for debug
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if (debug() >= 9) backp->dumpTree(cout, "- pre : ");
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AstCFunc* funcp = createDeepFunc(nodep);
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iterate(funcp);
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if (debug() >= 9) backp->dumpTree(cout, "- post: ");
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if (debug() >= 9) funcp->dumpTree(cout, "- func: ");
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} else {
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iterateChildren(nodep);
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}
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m_depth--;
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}
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virtual void visit(AstNodeStmt* nodep) override {
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if (!nodep->isStatement()) {
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iterateChildren(nodep);
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} else {
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visitStmt(nodep);
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}
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}
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virtual void visit(AstNodeMath*) override {} // Accelerate
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//--------------------
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virtual void visit(AstVar*) override {} // Don't hit varrefs under vars
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virtual void visit(AstNode* nodep) override { iterateChildren(nodep); }
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public:
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// CONSTRUCTORS
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explicit DepthBlockVisitor(AstNetlist* nodep) {
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m_modp = nullptr;
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m_funcp = nullptr;
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m_depth = 0;
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m_deepNum = 0;
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//
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iterate(nodep);
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}
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virtual ~DepthBlockVisitor() override {}
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};
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//######################################################################
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// DepthBlock class functions
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void V3DepthBlock::depthBlockAll(AstNetlist* nodep) {
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UINFO(2, __FUNCTION__ << ": " << endl);
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{ DepthBlockVisitor visitor(nodep); } // Destruct before checking
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V3Global::dumpCheckGlobalTree("deepblock", 0, v3Global.opt.dumpTreeLevel(__FILE__) >= 3);
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}
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