// -*- mode: C++; c-file-style: "cc-mode" -*-
//*************************************************************************
// DESCRIPTION: Verilator: Error handling
//
// Code available from: http://www.veripool.org/verilator
//
//*************************************************************************
//
// Copyright 2003-2017 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 <cstdio>
#include <cstdarg>
#include <cstring>
#include <set>
#include "V3Error.h"
#include "V3FileLine.h"
#ifndef _V3ERROR_NO_GLOBAL_
# include "V3Ast.h"
# include "V3Global.h"
# include "V3Stats.h"
# include "V3Config.h"
#endif

//######################################################################
// FileLineSingleton class functions

const string FileLineSingleton::filenameLetters(int no) {
    const int size = 1 + (64 / 4);  // Each letter retires more than 4 bits of a > 64 bit number
    char out[size];
    char* op = out+size-1;
    *--op = '\0';  // We build backwards
    int num = no;
    do {
	*--op = 'a'+num%26;
	num /= 26;
    } while (num);
    return op;
}

//! Convert filenames to a filenameno

//! This lets us assign a nice small identifier for debug messages, but more
//! importantly lets us use a 4 byte int instead of 8 byte pointer in every
//! FileLine.

//! We associate a language with each source file, so we also set the default
//! for this.
int FileLineSingleton::nameToNumber(const string& filename) {
    FileNameNumMap::const_iterator it = m_namemap.find(filename);
    if (VL_LIKELY(it != m_namemap.end())) return it->second;
    int num = m_names.size();
    m_names.push_back(filename);
    m_languages.push_back(V3LangCode::mostRecent());
    m_namemap.insert(make_pair(filename,num));
    return num;
}

//! Support XML output

//! Experimental. Updated to also put out the language.
void FileLineSingleton::fileNameNumMapDumpXml(ostream& os) {
    os<<"<files>\n";
    for (FileNameNumMap::const_iterator it = m_namemap.begin(); it != m_namemap.end(); ++it) {
	os<<"<file id=\""<<filenameLetters(it->second)
	  <<"\" filename=\""<<it->first
	  <<"\" language=\""<<numberToLang(it->second).ascii()<<"\"/>\n";
    }
    os<<"</files>\n";
}

//######################################################################
// FileLine class functions

FileLine::FileLine(FileLine::EmptySecret) {
    // Sort of a singleton
    m_lineno=0;
    m_filenameno=singleton().nameToNumber("AstRoot");

    m_warnOn=0;
    for (int codei=V3ErrorCode::EC_MIN; codei<V3ErrorCode::_ENUM_MAX; codei++) {
	V3ErrorCode code = (V3ErrorCode)codei;
	warnOff(code, code.defaultsOff());
    }
}

string FileLine::lineDirectiveStrg(int enterExit) const {
    char numbuf[20]; sprintf(numbuf, "%d", lineno());
    char levelbuf[20]; sprintf(levelbuf, "%d", enterExit);
    return ((string)"`line "+numbuf+" \""+filename()+"\" "+levelbuf+"\n");
}

void FileLine::lineDirective(const char* textp, int& enterExitRef) {
    // Handle `line directive
    // Skip `line
    while (*textp && isspace(*textp)) textp++;
    while (*textp && !isspace(*textp)) textp++;
    while (*textp && (isspace(*textp) || *textp=='"')) textp++;

    // Grab linenumber
    const char *ln = textp;
    while (*textp && !isspace(*textp)) textp++;
    if (isdigit(*ln)) {
	lineno(atoi(ln));
    }
    while (*textp && (isspace(*textp) || *textp=='"')) textp++;

    // Grab filename
    const char *fn = textp;
    while (*textp && !(isspace(*textp) || *textp=='"')) textp++;
    if (textp != fn) {
	string strfn = fn;
	strfn = strfn.substr(0, textp-fn);
	filename(strfn);
    }

    // Grab level
    while (*textp && (isspace(*textp) || *textp=='"')) textp++;
    if (isdigit(*textp)) enterExitRef = atoi(textp);
    else enterExitRef = 0;

    //printf ("PPLINE %d '%s'\n", s_lineno, s_filename.c_str());
}

FileLine* FileLine::copyOrSameFileLine() {
    // When a fileline is "used" to produce a node, calls this function.
    // Return this, or a copy of this
    // There are often more than one token per line, thus we use the
    // same pointer as long as we're on the same line, file & warn state.
#ifndef _V3ERROR_NO_GLOBAL_
    V3Config::applyIgnores(this);  // Toggle warnings based on global config file
#endif
    static FileLine* lastNewp = NULL;
    if (lastNewp && *lastNewp == *this) {  // Compares lineno, filename, etc
	return lastNewp;
    }
    FileLine* newp = new FileLine(this);
    lastNewp = newp;
    return newp;
}

const string FileLine::filebasename() const {
    string name = filename();
    string::size_type pos;
    if ((pos = name.rfind("/")) != string::npos) {
	name.erase(0,pos+1);
    }
    return name;
}

const string FileLine::filebasenameNoExt() const {
    string name = filebasename();
    string::size_type pos;
    if ((pos = name.find(".")) != string::npos) {
	name = name.substr(0,pos);
    }
    return name;
}

const string FileLine::profileFuncname() const {
    // Return string that is OK as a function name - for profiling
    string name  = filebasenameNoExt();
    string::size_type pos;
    while ((pos = name.find_first_not_of("abcdefghijlkmnopqrstuvwxyzABCDEFGHIJLKMNOPQRSTUVWXYZ0123456789_"))
	   != string::npos) {
	name.replace(pos, 1, "_");
    }
    name += "__l"+cvtToStr(lineno());
    return name;
}

string FileLine::ascii() const {
    return filename()+":"+cvtToStr(lineno());
}
ostream& operator<<(ostream& os, FileLine* fileline) {
    os <<fileline->ascii()<<": "<<hex;
    return(os);
}

bool FileLine::warnOff(const string& msg, bool flag) {
    V3ErrorCode code (msg.c_str());
    if (code < V3ErrorCode::EC_FIRST_WARN) {
	return false;
#ifndef _V3ERROR_NO_GLOBAL_
    } else if (v3Global.opt.lintOnly()   // Lint mode is allowed to suppress some errors
	       && code < V3ErrorCode::EC_MIN) {
	return false;
#endif
    } else {
	warnOff(code, flag);
	return true;
    }
}

void FileLine::warnLintOff(bool flag) {
    for (int codei=V3ErrorCode::EC_MIN; codei<V3ErrorCode::_ENUM_MAX; codei++) {
	V3ErrorCode code = (V3ErrorCode)codei;
	if (code.lintError()) warnOff(code, flag);
    }
}

void FileLine::warnStyleOff(bool flag) {
    for (int codei=V3ErrorCode::EC_MIN; codei<V3ErrorCode::_ENUM_MAX; codei++) {
	V3ErrorCode code = (V3ErrorCode)codei;
	if (code.styleError()) warnOff(code, flag);
    }
}

bool FileLine::warnIsOff(V3ErrorCode code) const {
    if (!m_warnOn.test(code)) return true;
    if (!defaultFileLine().m_warnOn.test(code)) return true;  // Global overrides local
    // UNOPTFLAT implies UNOPT
    if (code==V3ErrorCode::UNOPT && !m_warnOn.test(V3ErrorCode::UNOPTFLAT)) return true;
    if ((code.lintError() || code.styleError()) && !m_warnOn.test(V3ErrorCode::I_LINT)) return true;
    return false;
}

void FileLine::modifyStateInherit(const FileLine* fromp) {
    // Any warnings that are off in "from", become off in "this".
    for (int codei=V3ErrorCode::EC_MIN; codei<V3ErrorCode::_ENUM_MAX; codei++) {
	V3ErrorCode code = (V3ErrorCode)codei;
	if (fromp->warnIsOff(code)) {
	    warnOff(code, true);
	}
    }
}

void FileLine::v3errorEnd(ostringstream& str) {
    if (m_lineno) {
	ostringstream nsstr;
	nsstr<<this<<str.str();
	if (warnIsOff(V3Error::errorCode())) V3Error::suppressThisWarning();
	V3Error::v3errorEnd(nsstr);
    } else {
	V3Error::v3errorEnd(str);
    }
}

string FileLine::warnMore() const {
    if (m_lineno) {
	return V3Error::warnMore()+ascii()+": ";
    } else {
	return V3Error::warnMore();
    }
}

#ifdef VL_LEAK_CHECKS
typedef set<FileLine*> FileLineCheckSet;
FileLineCheckSet fileLineLeakChecks;

void* FileLine::operator new(size_t size) {
    FileLine* objp = static_cast<FileLine*>(::operator new(size));
    fileLineLeakChecks.insert(objp);
    return objp;
}

void FileLine::operator delete(void* objp, size_t size) {
    if (!objp) return;
    FileLine* flp = static_cast<FileLine*>(objp);
    FileLineCheckSet::iterator it = fileLineLeakChecks.find(flp);
    if (it != fileLineLeakChecks.end()) {
	fileLineLeakChecks.erase(it);
    } else {
	flp->v3fatalSrc("Deleting FileLine object that was never tracked\n");
    }
    ::operator delete(objp);
}
#endif

void FileLine::deleteAllRemaining() {
#ifdef VL_LEAK_CHECKS
    // FileLines are allocated, but never nicely freed, as it's much faster
    // that way.  Unfortunately this makes our leak checking a big mess, so
    // only when leak checking we'll track them all and cleanup.
    while (1) {
	FileLineCheckSet::iterator it=fileLineLeakChecks.begin();
	if (it==fileLineLeakChecks.end()) break;
	delete *it;
	// Operator delete will remove the iterated object from the list.
	// Eventually the list will be empty and terminate the loop.
    }
    fileLineLeakChecks.clear();
    singleton().clear();
#endif
}