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2cad22a22a
** Add simulation context (VerilatedContext) to allow multiple fully independent
models to be in the same process. Please see the updated examples.
** Add context->time() and context->timeInc() API calls, to set simulation time.
These now are recommended in place of the legacy sc_time_stamp().
106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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// DESCRIPTION: Verilator: Emit C++ for tree
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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 2003-2021 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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#include "config_build.h"
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#include "verilatedos.h"
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#include "V3Global.h"
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#include "V3EmitC.h"
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#include "V3EmitCBase.h"
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#include "V3EmitCMain.h"
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#include <map>
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//######################################################################
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class EmitCMain final : EmitCBaseVisitor {
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// METHODS
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// VISITORS
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// This visitor doesn't really iterate, but exist to appease base class
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virtual void visit(AstNode* nodep) override { iterateChildren(nodep); } // LCOV_EXCL_LINE
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public:
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// CONSTRUCTORS
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explicit EmitCMain(AstNetlist*) { emitInt(); }
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private:
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// MAIN METHOD
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void emitInt() {
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string filename = v3Global.opt.makeDir() + "/" + topClassName() + "__main.cpp";
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newCFile(filename, false /*slow*/, true /*source*/);
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V3OutCFile cf(filename);
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m_ofp = &cf;
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// Not defining main_time/vl_time_stamp, so
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v3Global.opt.addCFlags("-DVL_TIME_CONTEXT"); // On MSVC++ anyways
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// Heavly commented output, as users are likely to look at or copy this code
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ofp()->putsHeader();
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puts("// DESCRIPTION: main() calling loop, created with Verilator --main\n");
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puts("\n");
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puts("#include \"verilated.h\"\n");
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puts("#include \"" + topClassName() + ".h\"\n");
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puts("\n//======================\n\n");
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puts("int main(int argc, char** argv, char**) {\n");
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puts("// Setup context, defaults, and parse command line\n");
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puts("Verilated::debug(0);\n");
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puts("const std::unique_ptr<VerilatedContext> contextp{new VerilatedContext};\n");
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puts("contextp->commandArgs(argc, argv);\n");
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puts("\n");
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puts("// Construct the Verilated model, from Vtop.h generated from Verilating\n");
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puts("const std::unique_ptr<" + topClassName() + "> topp{new " + topClassName()
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+ "{contextp.get()}};\n");
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puts("\n");
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puts("// Evaluate initials\n");
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puts("topp->eval(); // Evaluate\n");
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puts("\n");
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puts("// Simulate until $finish\n");
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puts("while (!contextp->gotFinish()) {\n");
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puts(/**/ "// Evaluate model\n");
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puts(/**/ "topp->eval();\n");
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puts(/**/ "// Advance time\n");
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puts(/**/ "contextp->timeInc(1);\n");
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puts("}\n");
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puts("\n");
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puts("if (!contextp->gotFinish()) {\n");
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puts(/**/ "VL_DEBUG_IF(VL_PRINTF(\"+ Exiting without $finish; no events left\\n\"););\n");
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puts("}\n");
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puts("\n");
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puts("// Final model cleanup\n");
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puts("topp->final();\n");
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puts("return 0;\n");
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puts("}\n");
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}
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};
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//######################################################################
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// EmitC class functions
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void V3EmitCMain::emit() {
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UINFO(2, __FUNCTION__ << ": " << endl);
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EmitCMain(v3Global.rootp());
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}
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