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simplecpp.cpp
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executable file
·2875 lines (2544 loc) · 105 KB
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/*
* simplecpp - A simple and high-fidelity C/C++ preprocessor library
* Copyright (C) 2016 Daniel Marjamäki.
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#if defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
#define SIMPLECPP_WINDOWS
#define NOMINMAX
#endif
#include "simplecpp.h"
#include <algorithm>
#include <cstdlib>
#include <cstring>
#include <exception>
#include <fstream>
#include <iostream>
#include <limits>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <utility>
#ifdef SIMPLECPP_WINDOWS
#include <windows.h>
#undef ERROR
#undef TRUE
#endif
static bool isHex(const std::string &s)
{
return s.size()>2 && (s.compare(0,2,"0x")==0 || s.compare(0,2,"0X")==0);
}
static bool isOct(const std::string &s)
{
return s.size()>1 && (s[0]=='0') && (s[1] >= '0') && (s[1] < '8');
}
static const simplecpp::TokenString DEFINE("define");
static const simplecpp::TokenString UNDEF("undef");
static const simplecpp::TokenString INCLUDE("include");
static const simplecpp::TokenString ERROR("error");
static const simplecpp::TokenString WARNING("warning");
static const simplecpp::TokenString IF("if");
static const simplecpp::TokenString IFDEF("ifdef");
static const simplecpp::TokenString IFNDEF("ifndef");
static const simplecpp::TokenString DEFINED("defined");
static const simplecpp::TokenString ELSE("else");
static const simplecpp::TokenString ELIF("elif");
static const simplecpp::TokenString ENDIF("endif");
static const simplecpp::TokenString PRAGMA("pragma");
static const simplecpp::TokenString ONCE("once");
template<class T> static std::string toString(T t)
{
std::ostringstream ostr;
ostr << t;
return ostr.str();
}
static long long stringToLL(const std::string &s)
{
long long ret;
const bool hex = isHex(s);
const bool oct = isOct(s);
std::istringstream istr(hex ? s.substr(2) : oct ? s.substr(1) : s);
if (hex)
istr >> std::hex;
else if (oct)
istr >> std::oct;
istr >> ret;
return ret;
}
static unsigned long long stringToULL(const std::string &s)
{
unsigned long long ret;
const bool hex = isHex(s);
const bool oct = isOct(s);
std::istringstream istr(hex ? s.substr(2) : oct ? s.substr(1) : s);
if (hex)
istr >> std::hex;
else if (oct)
istr >> std::oct;
istr >> ret;
return ret;
}
static bool startsWith(const std::string &str, const std::string &s)
{
return (str.size() >= s.size() && str.compare(0, s.size(), s) == 0);
}
static bool endsWith(const std::string &s, const std::string &e)
{
return (s.size() >= e.size() && s.compare(s.size() - e.size(), e.size(), e) == 0);
}
static bool sameline(const simplecpp::Token *tok1, const simplecpp::Token *tok2)
{
return tok1 && tok2 && tok1->location.sameline(tok2->location);
}
static bool isAlternativeBinaryOp(const simplecpp::Token *tok, const std::string &alt)
{
return (tok->name &&
tok->str() == alt &&
tok->previous &&
tok->next &&
(tok->previous->number || tok->previous->name || tok->previous->op == ')') &&
(tok->next->number || tok->next->name || tok->next->op == '('));
}
static bool isAlternativeUnaryOp(const simplecpp::Token *tok, const std::string &alt)
{
return ((tok->name && tok->str() == alt) &&
(!tok->previous || tok->previous->op == '(') &&
(tok->next && (tok->next->name || tok->next->number)));
}
const std::string simplecpp::Location::emptyFileName;
void simplecpp::Location::adjust(const std::string &str)
{
if (str.find_first_of("\r\n") == std::string::npos) {
col += str.size();
return;
}
for (std::size_t i = 0U; i < str.size(); ++i) {
col++;
if (str[i] == '\n' || str[i] == '\r') {
col = 1;
line++;
if (str[i] == '\r' && (i+1)<str.size() && str[i+1]=='\n')
++i;
}
}
}
bool simplecpp::Token::isOneOf(const char ops[]) const
{
return (op != '\0') && (std::strchr(ops, op) != NULL);
}
bool simplecpp::Token::startsWithOneOf(const char c[]) const
{
return std::strchr(c, string[0]) != NULL;
}
bool simplecpp::Token::endsWithOneOf(const char c[]) const
{
return std::strchr(c, string[string.size() - 1U]) != NULL;
}
void simplecpp::Token::printAll() const
{
const Token *tok = this;
while (tok->previous)
tok = tok->previous;
for (; tok; tok = tok->next) {
if (tok->previous) {
std::cout << (sameline(tok, tok->previous) ? ' ' : '\n');
}
std::cout << tok->str();
}
std::cout << std::endl;
}
void simplecpp::Token::printOut() const
{
for (const Token *tok = this; tok; tok = tok->next) {
if (tok != this) {
std::cout << (sameline(tok, tok->previous) ? ' ' : '\n');
}
std::cout << tok->str();
}
std::cout << std::endl;
}
simplecpp::TokenList::TokenList(std::vector<std::string> &filenames) : frontToken(NULL), backToken(NULL), files(filenames) {}
simplecpp::TokenList::TokenList(std::istream &istr, std::vector<std::string> &filenames, const std::string &filename, OutputList *outputList)
: frontToken(NULL), backToken(NULL), files(filenames)
{
readfile(istr,filename,outputList);
}
simplecpp::TokenList::TokenList(const TokenList &other) : frontToken(NULL), backToken(NULL), files(other.files)
{
*this = other;
}
#if __cplusplus >= 201103L
simplecpp::TokenList::TokenList(TokenList &&other) : frontToken(NULL), backToken(NULL), files(other.files)
{
*this = std::move(other);
}
#endif
simplecpp::TokenList::~TokenList()
{
clear();
}
simplecpp::TokenList &simplecpp::TokenList::operator=(const TokenList &other)
{
if (this != &other) {
clear();
for (const Token *tok = other.cfront(); tok; tok = tok->next)
push_back(new Token(*tok));
sizeOfType = other.sizeOfType;
}
return *this;
}
#if __cplusplus >= 201103L
simplecpp::TokenList &simplecpp::TokenList::operator=(TokenList &&other)
{
if (this != &other) {
clear();
backToken = other.backToken;
other.backToken = NULL;
frontToken = other.frontToken;
other.frontToken = NULL;
sizeOfType = std::move(other.sizeOfType);
}
return *this;
}
#endif
void simplecpp::TokenList::clear()
{
backToken = NULL;
while (frontToken) {
Token *next = frontToken->next;
delete frontToken;
frontToken = next;
}
sizeOfType.clear();
}
void simplecpp::TokenList::push_back(Token *tok)
{
if (!frontToken)
frontToken = tok;
else
backToken->next = tok;
tok->previous = backToken;
backToken = tok;
}
void simplecpp::TokenList::dump() const
{
std::cout << stringify() << std::endl;
}
std::string simplecpp::TokenList::stringify() const
{
std::ostringstream ret;
Location loc(files);
for (const Token *tok = cfront(); tok; tok = tok->next) {
if (tok->location.line < loc.line || tok->location.fileIndex != loc.fileIndex) {
ret << "\n#line " << tok->location.line << " \"" << tok->location.file() << "\"\n";
loc = tok->location;
}
while (tok->location.line > loc.line) {
ret << '\n';
loc.line++;
}
if (sameline(tok->previous, tok))
ret << ' ';
ret << tok->str();
loc.adjust(tok->str());
}
return ret.str();
}
static unsigned char readChar(std::istream &istr, unsigned int bom)
{
unsigned char ch = (unsigned char)istr.get();
// For UTF-16 encoded files the BOM is 0xfeff/0xfffe. If the
// character is non-ASCII character then replace it with 0xff
if (bom == 0xfeff || bom == 0xfffe) {
const unsigned char ch2 = (unsigned char)istr.get();
const int ch16 = (bom == 0xfeff) ? (ch<<8 | ch2) : (ch2<<8 | ch);
ch = (unsigned char)((ch16 >= 0x80) ? 0xff : ch16);
}
// Handling of newlines..
if (ch == '\r') {
ch = '\n';
if (bom == 0 && (char)istr.peek() == '\n')
(void)istr.get();
else if (bom == 0xfeff || bom == 0xfffe) {
int c1 = istr.get();
int c2 = istr.get();
int ch16 = (bom == 0xfeff) ? (c1<<8 | c2) : (c2<<8 | c1);
if (ch16 != '\n') {
istr.unget();
istr.unget();
}
}
}
return ch;
}
static unsigned char peekChar(std::istream &istr, unsigned int bom)
{
unsigned char ch = (unsigned char)istr.peek();
// For UTF-16 encoded files the BOM is 0xfeff/0xfffe. If the
// character is non-ASCII character then replace it with 0xff
if (bom == 0xfeff || bom == 0xfffe) {
(void)istr.get();
const unsigned char ch2 = (unsigned char)istr.peek();
istr.unget();
const int ch16 = (bom == 0xfeff) ? (ch<<8 | ch2) : (ch2<<8 | ch);
ch = (unsigned char)((ch16 >= 0x80) ? 0xff : ch16);
}
// Handling of newlines..
if (ch == '\r')
ch = '\n';
return ch;
}
static void ungetChar(std::istream &istr, unsigned int bom)
{
istr.unget();
if (bom == 0xfeff || bom == 0xfffe)
istr.unget();
}
static unsigned short getAndSkipBOM(std::istream &istr)
{
const int ch1 = istr.peek();
// The UTF-16 BOM is 0xfffe or 0xfeff.
if (ch1 >= 0xfe) {
unsigned short bom = ((unsigned char)istr.get() << 8);
if (istr.peek() >= 0xfe)
return bom | (unsigned char)istr.get();
istr.unget();
return 0;
}
// Skip UTF-8 BOM 0xefbbbf
if (ch1 == 0xef) {
(void)istr.get();
if (istr.get() == 0xbb && istr.peek() == 0xbf) {
(void)istr.get();
} else {
istr.unget();
istr.unget();
}
}
return 0;
}
static bool isNameChar(unsigned char ch)
{
return std::isalnum(ch) || ch == '_' || ch == '$';
}
static std::string escapeString(const std::string &str)
{
std::ostringstream ostr;
ostr << '\"';
for (std::size_t i = 1U; i < str.size() - 1; ++i) {
char c = str[i];
if (c == '\\' || c == '\"' || c == '\'')
ostr << '\\';
ostr << c;
}
ostr << '\"';
return ostr.str();
}
static void portabilityBackslash(simplecpp::OutputList *outputList, const std::vector<std::string> &files, const simplecpp::Location &location)
{
if (!outputList)
return;
simplecpp::Output err(files);
err.type = simplecpp::Output::PORTABILITY_BACKSLASH;
err.location = location;
err.msg = "Combination 'backslash space newline' is not portable.";
outputList->push_back(err);
}
static bool isStringLiteralPrefix(const std::string &str)
{
return str == "u" || str == "U" || str == "L" || str == "u8" ||
str == "R" || str == "uR" || str == "UR" || str == "LR" || str == "u8R";
}
void simplecpp::TokenList::lineDirective(unsigned int fileIndex, unsigned int line, Location *location)
{
if (fileIndex != location->fileIndex || line >= location->line) {
location->fileIndex = fileIndex;
location->line = line;
return;
}
if (line + 2 >= location->line) {
location->line = line;
while (cback()->op != '#')
deleteToken(back());
deleteToken(back());
return;
}
}
void simplecpp::TokenList::readfile(std::istream &istr, const std::string &filename, OutputList *outputList)
{
std::stack<simplecpp::Location> loc;
unsigned int multiline = 0U;
const Token *oldLastToken = NULL;
const unsigned short bom = getAndSkipBOM(istr);
Location location(files);
location.fileIndex = fileIndex(filename);
location.line = 1U;
location.col = 1U;
while (istr.good()) {
unsigned char ch = readChar(istr,bom);
if (!istr.good())
break;
if (ch < ' ' && ch != '\t' && ch != '\n' && ch != '\r')
ch = ' ';
if (ch >= 0x80) {
if (outputList) {
simplecpp::Output err(files);
err.type = simplecpp::Output::UNHANDLED_CHAR_ERROR;
err.location = location;
std::ostringstream s;
s << (int)ch;
err.msg = "The code contains unhandled character(s) (character code=" + s.str() + "). Neither unicode nor extended ascii is supported.";
outputList->push_back(err);
}
clear();
return;
}
if (ch == '\n') {
if (cback() && cback()->op == '\\') {
if (location.col > cback()->location.col + 1U)
portabilityBackslash(outputList, files, cback()->location);
++multiline;
deleteToken(back());
} else {
location.line += multiline + 1;
multiline = 0U;
}
if (!multiline)
location.col = 1;
if (oldLastToken != cback()) {
oldLastToken = cback();
const std::string lastline(lastLine());
if (lastline == "# file %str%") {
loc.push(location);
location.fileIndex = fileIndex(cback()->str().substr(1U, cback()->str().size() - 2U));
location.line = 1U;
} else if (lastline == "# line %num%") {
lineDirective(location.fileIndex, std::atol(cback()->str().c_str()), &location);
} else if (lastline == "# %num% %str%" || lastline == "# line %num% %str%") {
lineDirective(fileIndex(cback()->str().substr(1U, cback()->str().size() - 2U)),
std::atol(cback()->previous->str().c_str()), &location);
}
// #endfile
else if (lastline == "# endfile" && !loc.empty()) {
location = loc.top();
loc.pop();
}
}
continue;
}
if (std::isspace(ch)) {
location.col++;
continue;
}
TokenString currentToken;
if (cback() && cback()->location.line == location.line && cback()->previous && cback()->previous->op == '#' && (lastLine() == "# error" || lastLine() == "# warning")) {
char prev = ' ';
while (istr.good() && (prev == '\\' || (ch != '\r' && ch != '\n'))) {
currentToken += ch;
prev = ch;
ch = readChar(istr, bom);
}
ungetChar(istr, bom);
push_back(new Token(currentToken, location));
location.adjust(currentToken);
continue;
}
// number or name
if (isNameChar(ch)) {
const bool num = std::isdigit(ch);
while (istr.good() && isNameChar(ch)) {
currentToken += ch;
ch = readChar(istr,bom);
if (num && ch=='\'' && isNameChar(peekChar(istr,bom)))
ch = readChar(istr,bom);
}
ungetChar(istr,bom);
}
// comment
else if (ch == '/' && peekChar(istr,bom) == '/') {
while (istr.good() && ch != '\r' && ch != '\n') {
currentToken += ch;
ch = readChar(istr, bom);
}
const std::string::size_type pos = currentToken.find_last_not_of(" \t");
if (pos < currentToken.size() - 1U && currentToken[pos] == '\\')
portabilityBackslash(outputList, files, location);
if (currentToken[currentToken.size() - 1U] == '\\') {
++multiline;
currentToken.erase(currentToken.size() - 1U);
} else {
ungetChar(istr, bom);
}
}
// comment
else if (ch == '/' && peekChar(istr,bom) == '*') {
currentToken = "/*";
(void)readChar(istr,bom);
ch = readChar(istr,bom);
while (istr.good()) {
currentToken += ch;
if (currentToken.size() >= 4U && endsWith(currentToken, "*/"))
break;
ch = readChar(istr,bom);
}
// multiline..
std::string::size_type pos = 0;
while ((pos = currentToken.find("\\\n",pos)) != std::string::npos) {
currentToken.erase(pos,2);
++multiline;
}
if (multiline || startsWith(lastLine(10),"# ")) {
pos = 0;
while ((pos = currentToken.find('\n',pos)) != std::string::npos) {
currentToken.erase(pos,1);
++multiline;
}
}
}
// string / char literal
else if (ch == '\"' || ch == '\'') {
std::string prefix;
if (cback() && cback()->name && isStringLiteralPrefix(cback()->str()) &&
((cback()->location.col + cback()->str().size()) == location.col) &&
(cback()->location.line == location.line)) {
prefix = cback()->str();
}
// C++11 raw string literal
if (ch == '\"' && !prefix.empty() && *cback()->str().rbegin() == 'R') {
std::string delim;
currentToken = ch;
prefix.resize(prefix.size() - 1);
ch = readChar(istr,bom);
while (istr.good() && ch != '(' && ch != '\n') {
delim += ch;
ch = readChar(istr,bom);
}
if (!istr.good() || ch == '\n') {
if (outputList) {
Output err(files);
err.type = Output::SYNTAX_ERROR;
err.location = location;
err.msg = "Invalid newline in raw string delimiter.";
outputList->push_back(err);
}
return;
}
const std::string endOfRawString(')' + delim + currentToken);
while (istr.good() && !(endsWith(currentToken, endOfRawString) && currentToken.size() > 1))
currentToken += readChar(istr,bom);
if (!endsWith(currentToken, endOfRawString)) {
if (outputList) {
Output err(files);
err.type = Output::SYNTAX_ERROR;
err.location = location;
err.msg = "Raw string missing terminating delimiter.";
outputList->push_back(err);
}
return;
}
currentToken.erase(currentToken.size() - endOfRawString.size(), endOfRawString.size() - 1U);
currentToken = escapeString(currentToken);
currentToken.insert(0, prefix);
back()->setstr(currentToken);
location.adjust(currentToken);
if (currentToken.find_first_of("\r\n") == std::string::npos)
location.col += 2 + 2 * delim.size();
else
location.col += 1 + delim.size();
continue;
}
currentToken = readUntil(istr,location,ch,ch,outputList,bom);
if (currentToken.size() < 2U)
// Error is reported by readUntil()
return;
std::string s = currentToken;
std::string::size_type pos;
int newlines = 0;
while ((pos = s.find_first_of("\r\n")) != std::string::npos) {
s.erase(pos,1);
newlines++;
}
if (prefix.empty())
push_back(new Token(s, location)); // push string without newlines
else
back()->setstr(prefix + s);
if (newlines > 0 && lastLine().compare(0,9,"# define ") == 0) {
multiline += newlines;
location.adjust(s);
} else {
location.adjust(currentToken);
}
continue;
}
else {
currentToken += ch;
}
if (currentToken == "<" && lastLine() == "# include") {
currentToken = readUntil(istr, location, '<', '>', outputList, bom);
if (currentToken.size() < 2U)
return;
}
push_back(new Token(currentToken, location));
if (multiline)
location.col += currentToken.size();
else
location.adjust(currentToken);
}
combineOperators();
}
void simplecpp::TokenList::constFold()
{
while (cfront()) {
// goto last '('
Token *tok = back();
while (tok && tok->op != '(')
tok = tok->previous;
// no '(', goto first token
if (!tok)
tok = front();
// Constant fold expression
constFoldUnaryNotPosNeg(tok);
constFoldMulDivRem(tok);
constFoldAddSub(tok);
constFoldShift(tok);
constFoldComparison(tok);
constFoldBitwise(tok);
constFoldLogicalOp(tok);
constFoldQuestionOp(&tok);
// If there is no '(' we are done with the constant folding
if (tok->op != '(')
break;
if (!tok->next || !tok->next->next || tok->next->next->op != ')')
break;
tok = tok->next;
deleteToken(tok->previous);
deleteToken(tok->next);
}
}
static bool isFloatSuffix(const simplecpp::Token *tok)
{
if (!tok || tok->str().size() != 1U)
return false;
const char c = std::tolower(tok->str()[0]);
return c == 'f' || c == 'l';
}
void simplecpp::TokenList::combineOperators()
{
std::stack<bool> executableScope;
executableScope.push(false);
for (Token *tok = front(); tok; tok = tok->next) {
if (tok->op == '{') {
if (executableScope.top()) {
executableScope.push(true);
continue;
}
const Token *prev = tok->previous;
while (prev && prev->isOneOf(";{}()"))
prev = prev->previous;
executableScope.push(prev && prev->op == ')');
continue;
}
if (tok->op == '}') {
if (executableScope.size() > 1)
executableScope.pop();
continue;
}
if (tok->op == '.') {
if (tok->previous && tok->previous->op == '.')
continue;
if (tok->next && tok->next->op == '.')
continue;
// float literals..
if (tok->previous && tok->previous->number) {
tok->setstr(tok->previous->str() + '.');
deleteToken(tok->previous);
if (isFloatSuffix(tok->next) || (tok->next && tok->next->startsWithOneOf("Ee"))) {
tok->setstr(tok->str() + tok->next->str());
deleteToken(tok->next);
}
}
if (tok->next && tok->next->number) {
tok->setstr(tok->str() + tok->next->str());
deleteToken(tok->next);
}
}
// match: [0-9.]+E [+-] [0-9]+
const char lastChar = tok->str()[tok->str().size() - 1];
if (tok->number && !isHex(tok->str()) && !isOct(tok->str()) && (lastChar == 'E' || lastChar == 'e') && tok->next && tok->next->isOneOf("+-") && tok->next->next && tok->next->next->number) {
tok->setstr(tok->str() + tok->next->op + tok->next->next->str());
deleteToken(tok->next);
deleteToken(tok->next);
}
if (tok->op == '\0' || !tok->next || tok->next->op == '\0')
continue;
if (!sameline(tok,tok->next))
continue;
if (tok->location.col + 1U != tok->next->location.col)
continue;
if (tok->next->op == '=' && tok->isOneOf("=!<>+-*/%&|^")) {
if (tok->op == '&' && !executableScope.top()) {
// don't combine &= if it is a anonymous reference parameter with default value:
// void f(x&=2)
int indentlevel = 0;
const Token *start = tok;
while (indentlevel >= 0 && start) {
if (start->op == ')')
++indentlevel;
else if (start->op == '(')
--indentlevel;
else if (start->isOneOf(";{}"))
break;
start = start->previous;
}
if (indentlevel == -1 && start) {
const Token *ftok = start;
bool isFuncDecl = ftok->name;
while (isFuncDecl) {
if (!start->name && start->str() != "::" && start->op != '*' && start->op != '&')
isFuncDecl = false;
if (!start->previous)
break;
if (start->previous->isOneOf(";{}:"))
break;
start = start->previous;
}
isFuncDecl &= start != ftok && start->name;
if (isFuncDecl) {
// TODO: we could loop through the parameters here and check if they are correct.
continue;
}
}
}
tok->setstr(tok->str() + "=");
deleteToken(tok->next);
} else if ((tok->op == '|' || tok->op == '&') && tok->op == tok->next->op) {
tok->setstr(tok->str() + tok->next->str());
deleteToken(tok->next);
} else if (tok->op == ':' && tok->next->op == ':') {
tok->setstr(tok->str() + tok->next->str());
deleteToken(tok->next);
} else if (tok->op == '-' && tok->next->op == '>') {
tok->setstr(tok->str() + tok->next->str());
deleteToken(tok->next);
} else if ((tok->op == '<' || tok->op == '>') && tok->op == tok->next->op) {
tok->setstr(tok->str() + tok->next->str());
deleteToken(tok->next);
if (tok->next && tok->next->op == '=') {
tok->setstr(tok->str() + tok->next->str());
deleteToken(tok->next);
}
} else if ((tok->op == '+' || tok->op == '-') && tok->op == tok->next->op) {
if (tok->location.col + 1U != tok->next->location.col)
continue;
if (tok->previous && tok->previous->number)
continue;
if (tok->next->next && tok->next->next->number)
continue;
tok->setstr(tok->str() + tok->next->str());
deleteToken(tok->next);
}
}
}
static const std::string COMPL("compl");
static const std::string NOT("not");
void simplecpp::TokenList::constFoldUnaryNotPosNeg(simplecpp::Token *tok)
{
for (; tok && tok->op != ')'; tok = tok->next) {
// "not" might be !
if (isAlternativeUnaryOp(tok, NOT))
tok->op = '!';
// "compl" might be ~
else if (isAlternativeUnaryOp(tok, COMPL))
tok->op = '~';
if (tok->op == '!' && tok->next && tok->next->number) {
tok->setstr(tok->next->str() == "0" ? "1" : "0");
deleteToken(tok->next);
} else if (tok->op == '~' && tok->next && tok->next->number) {
tok->setstr(toString(~stringToLL(tok->next->str())));
deleteToken(tok->next);
} else {
if (tok->previous && (tok->previous->number || tok->previous->name))
continue;
if (!tok->next || !tok->next->number)
continue;
switch (tok->op) {
case '+':
tok->setstr(tok->next->str());
deleteToken(tok->next);
break;
case '-':
tok->setstr(tok->op + tok->next->str());
deleteToken(tok->next);
break;
}
}
}
}
void simplecpp::TokenList::constFoldMulDivRem(Token *tok)
{
for (; tok && tok->op != ')'; tok = tok->next) {
if (!tok->previous || !tok->previous->number)
continue;
if (!tok->next || !tok->next->number)
continue;
long long result;
if (tok->op == '*')
result = (stringToLL(tok->previous->str()) * stringToLL(tok->next->str()));
else if (tok->op == '/' || tok->op == '%') {
long long rhs = stringToLL(tok->next->str());
if (rhs == 0)
throw std::overflow_error("division/modulo by zero");
long long lhs = stringToLL(tok->previous->str());
if (rhs == -1 && lhs == std::numeric_limits<long long>::min())
throw std::overflow_error("division overflow");
if (tok->op == '/')
result = (lhs / rhs);
else
result = (lhs % rhs);
} else
continue;
tok = tok->previous;
tok->setstr(toString(result));
deleteToken(tok->next);
deleteToken(tok->next);
}
}
void simplecpp::TokenList::constFoldAddSub(Token *tok)
{
for (; tok && tok->op != ')'; tok = tok->next) {
if (!tok->previous || !tok->previous->number)
continue;
if (!tok->next || !tok->next->number)
continue;
long long result;
if (tok->op == '+')
result = stringToLL(tok->previous->str()) + stringToLL(tok->next->str());
else if (tok->op == '-')
result = stringToLL(tok->previous->str()) - stringToLL(tok->next->str());
else
continue;
tok = tok->previous;
tok->setstr(toString(result));
deleteToken(tok->next);
deleteToken(tok->next);
}
}
void simplecpp::TokenList::constFoldShift(Token *tok)
{
for (; tok && tok->op != ')'; tok = tok->next) {
if (!tok->previous || !tok->previous->number)
continue;
if (!tok->next || !tok->next->number)
continue;
long long result;
if (tok->str() == "<<")
result = stringToLL(tok->previous->str()) << stringToLL(tok->next->str());
else if (tok->str() == ">>")
result = stringToLL(tok->previous->str()) >> stringToLL(tok->next->str());
else
continue;
tok = tok->previous;
tok->setstr(toString(result));
deleteToken(tok->next);
deleteToken(tok->next);
}
}
static const std::string NOTEQ("not_eq");
void simplecpp::TokenList::constFoldComparison(Token *tok)
{
for (; tok && tok->op != ')'; tok = tok->next) {
if (isAlternativeBinaryOp(tok,NOTEQ))
tok->setstr("!=");
if (!tok->startsWithOneOf("<>=!"))
continue;
if (!tok->previous || !tok->previous->number)
continue;
if (!tok->next || !tok->next->number)
continue;
int result;
if (tok->str() == "==")
result = (stringToLL(tok->previous->str()) == stringToLL(tok->next->str()));
else if (tok->str() == "!=")
result = (stringToLL(tok->previous->str()) != stringToLL(tok->next->str()));
else if (tok->str() == ">")
result = (stringToLL(tok->previous->str()) > stringToLL(tok->next->str()));
else if (tok->str() == ">=")
result = (stringToLL(tok->previous->str()) >= stringToLL(tok->next->str()));
else if (tok->str() == "<")
result = (stringToLL(tok->previous->str()) < stringToLL(tok->next->str()));
else if (tok->str() == "<=")
result = (stringToLL(tok->previous->str()) <= stringToLL(tok->next->str()));
else
continue;