// -*- mode: C++; c-file-style: "cc-mode" -*-
//*************************************************************************
// DESCRIPTION: Verilator: Preprocessing wrapper
//
// Code available from: http://www.veripool.org/verilator
//
//*************************************************************************
//
// Copyright 2004-2018 by Wilson Snyder.  This program is free software; you can
// redistribute it and/or modify it under the terms of either the GNU
// Lesser General Public License Version 3 or the Perl Artistic License
// Version 2.0.
//
// Verilator is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
//*************************************************************************

#include "config_build.h"
#include "verilatedos.h"

#include "V3Global.h"
#include "V3PreShell.h"
#include "V3PreProc.h"
#include "V3File.h"
#include "V3Parse.h"
#include "V3Os.h"

#include <algorithm>
#include <cstdarg>
#include <iostream>
#include <list>
#include <set>

//######################################################################

class V3PreShellImp {
protected:
    friend class V3PreShell;

    static V3PreShellImp s_preImp;
    static V3PreProc*	s_preprocp;
    static V3InFilter*	s_filterp;

    //---------------------------------------
    // METHODS

    static int debug(bool reset=false) {
	static int level = -1;
	if (VL_UNLIKELY(level < 0) || reset) {
	    level = v3Global.opt.debugSrcLevel(__FILE__);
	    if (s_preprocp) s_preprocp->debug(debug());
	}
	return level;
    }

    void boot(char** env) {
	// Create the implementation pointer
	if (env) {}
	if (!s_preprocp) {
	    FileLine* cmdfl = new FileLine("COMMAND_LINE",0);
	    s_preprocp = V3PreProc::createPreProc(cmdfl);
	    s_preprocp->debug(debug());
	    // Default defines
	    FileLine* prefl = new FileLine("INTERNAL_VERILATOR_DEFINE",0);
	    s_preprocp->defineCmdLine(prefl,"VERILATOR", "1");  // LEAK_OK
	    s_preprocp->defineCmdLine(prefl,"verilator", "1");  // LEAK_OK
	    s_preprocp->defineCmdLine(prefl,"verilator3", "1");  // LEAK_OK
	    s_preprocp->defineCmdLine(prefl,"systemc_clock", "/*verilator systemc_clock*/");  // LEAK_OK
	    s_preprocp->defineCmdLine(prefl,"coverage_block_off", "/*verilator coverage_block_off*/");  // LEAK_OK
	    if (prefl->language().systemVerilog()) {
		// Synthesis compatibility
		s_preprocp->defineCmdLine(prefl,"SYSTEMVERILOG", "1");  // LEAK_OK
		// IEEE predefined
		s_preprocp->defineCmdLine(prefl,"SV_COV_START", "0");
		s_preprocp->defineCmdLine(prefl,"SV_COV_STOP", "1");
		s_preprocp->defineCmdLine(prefl,"SV_COV_RESET", "2");
		s_preprocp->defineCmdLine(prefl,"SV_COV_CHECK", "3");
		s_preprocp->defineCmdLine(prefl,"SV_COV_MODULE", "10");
		s_preprocp->defineCmdLine(prefl,"SV_COV_HIER", "11");
		s_preprocp->defineCmdLine(prefl,"SV_COV_ASSERTION", "20");
		s_preprocp->defineCmdLine(prefl,"SV_COV_FSM_STATE", "21");
		s_preprocp->defineCmdLine(prefl,"SV_COV_STATEMENT", "22");
		s_preprocp->defineCmdLine(prefl,"SV_COV_TOGGLE", "23");
		s_preprocp->defineCmdLine(prefl,"SV_COV_OVERFLOW", "-2");
		s_preprocp->defineCmdLine(prefl,"SV_COV_ERROR", "-1");
		s_preprocp->defineCmdLine(prefl,"SV_COV_NOCOV", "0");
		s_preprocp->defineCmdLine(prefl,"SV_COV_OK", "1");
		s_preprocp->defineCmdLine(prefl,"SV_COV_PARTIAL", "2");
	    }
	}
    }

    bool preproc(FileLine* fl, const string& modname, V3InFilter* filterp, V3ParseImp* parsep,
                 const string& errmsg) {  // "" for no error
	debug(true);  // Recheck if debug on - first check was before command line passed

	// Preprocess the given module, putting output in vppFilename
	UINFONL(1,"  Preprocessing "<<modname<<endl);

	// Preprocess
	s_filterp = filterp;
	bool ok = preprocOpen(fl, s_filterp, modname, "", errmsg);
	if (!ok) return false;

	while (!s_preprocp->isEof()) {
	    string line = s_preprocp->getline();
	    V3Parse::ppPushText(parsep, line);
	}
	return true;
    }

    void preprocInclude(FileLine* fl, const string& modname) {
	if (modname[0]=='/' || modname[0]=='\\') {
	    fl->v3warn(INCABSPATH,"Suggest `include with absolute path be made relative, and use +include: "<<modname);
	}
	preprocOpen(fl, s_filterp, modname, V3Os::filenameDir(fl->filename()), "Cannot find include file: ");
    }

    bool preprocOpen(FileLine* fl, V3InFilter* filterp, const string& modname, const string& lastpath,
                     const string& errmsg) {  // Error message or "" to suppress
	// Returns true if successful
	// Try a pure name in case user has a bogus `filename they don't expect
        string filename = v3Global.opt.filePath(fl, modname, lastpath, errmsg);
	if (filename=="") {
	    // Allow user to put `defined names on the command line instead of filenames,
	    // then convert them properly.
            string ppmodname = s_preprocp->removeDefines(modname);

            filename = v3Global.opt.filePath(fl, ppmodname, lastpath, errmsg);
	}
	if (filename=="") return false;  // Not found

	UINFO(2,"    Reading "<<filename<<endl);
	s_preprocp->openFile(fl, filterp, filename);
	return true;
    }

    // CONSTRUCTORS
    V3PreShellImp() {}
    ~V3PreShellImp() {}
};

V3PreShellImp V3PreShellImp::s_preImp;
V3PreProc* V3PreShellImp::s_preprocp = NULL;
V3InFilter* V3PreShellImp::s_filterp = NULL;

//######################################################################
// Perl class functions

void V3PreShell::boot(char** env) {
    V3PreShellImp::s_preImp.boot(env);
}
bool V3PreShell::preproc(FileLine* fl, const string& modname, V3InFilter* filterp,
			 V3ParseImp* parsep, const string& errmsg) {
    return V3PreShellImp::s_preImp.preproc(fl, modname, filterp, parsep, errmsg);
}
void V3PreShell::preprocInclude(FileLine* fl, const string& modname) {
    V3PreShellImp::s_preImp.preprocInclude(fl, modname);
}
void V3PreShell::defineCmdLine(const string& name, const string& value) {
    FileLine* prefl = new FileLine("COMMAND_LINE_DEFINE",0);
    V3PreShellImp::s_preprocp->defineCmdLine(prefl, name, value);
}
void V3PreShell::undef(const string& name) {
    V3PreShellImp::s_preprocp->undef(name);
}