bool TemplateSimplifier::simplifyNumericCalculations(Token *tok)
{
bool ret = false;
// (1-2)
while (tok->tokAt(4) && tok->next()->isNumber() && tok->tokAt(3)->isNumber()) { // %any% %num% %any% %num% %any%
const Token* op = tok->tokAt(2);
const Token* after = tok->tokAt(4);
if (Token::Match(tok, "* %num% /") && (tok->strAt(3) != "0") && tok->next()->str() == MathLib::multiply(tok->strAt(3), MathLib::divide(tok->next()->str(), tok->strAt(3)))) {
// Division where result is a whole number
} else if (!((op->str() == "*" && (isLowerThanMulDiv(tok) || tok->str() == "*") && isLowerEqualThanMulDiv(after)) || // associative
(Token::Match(op, "[/%]") && isLowerThanMulDiv(tok) && isLowerEqualThanMulDiv(after)) || // NOT associative
(Token::Match(op, "[+-]") && isLowerThanMulDiv(tok) && isLowerThanMulDiv(after)) || // Only partially (+) associative, but handled later
(Token::Match(op, ">>|<<") && isLowerThanShift(tok) && isLowerThanPlusMinus(after)) || // NOT associative
(op->str() == "&" && isLowerThanShift(tok) && isLowerThanShift(after)) || // associative
(op->str() == "^" && isLowerThanAnd(tok) && isLowerThanAnd(after)) || // associative
(op->str() == "|" && isLowerThanXor(tok) && isLowerThanXor(after)))) // associative
break;
tok = tok->next();
// Don't simplify "%num% / 0"
if (Token::Match(op, "[/%] 0"))
continue;
// Integer operations
if (Token::Match(op, ">>|<<|&|^|%or%")) {
const char cop = op->str()[0];
std::string result;
if (tok->str().find_first_of("uU") != std::string::npos)
result = ShiftUInt(cop, tok, tok->tokAt(2));
else
result = ShiftInt(cop, tok, tok->tokAt(2));
if (!result.empty()) {
ret = true;
tok->str(result);
tok->deleteNext(2);
continue;
}
}
else if (Token::Match(tok->previous(), "- %num% - %num%"))
tok->str(MathLib::add(tok->str(), tok->strAt(2)));
else if (Token::Match(tok->previous(), "- %num% + %num%"))
tok->str(MathLib::subtract(tok->str(), tok->strAt(2)));
else {
try {
tok->str(MathLib::calculate(tok->str(), tok->strAt(2), op->str()[0]));
} catch (InternalError &e) {
e.token = tok;
throw;
}
}
tok->deleteNext(2);
ret = true;
}
return ret;
}
static bool isLowerThanShift(const Token* lower)
{
return isLowerThanAnd(lower) || Token::Match(lower, "%comp%|&");
}
// TODO: This is not the correct class for simplifyCalculations(), so it
// should be moved away.
bool TemplateSimplifier::simplifyCalculations(Token *_tokens)
{
bool ret = false;
for (Token *tok = _tokens; tok; tok = tok->next()) {
// Remove parentheses around variable..
// keep parentheses here: dynamic_cast<Fred *>(p);
// keep parentheses here: A operator * (int);
// keep parentheses here: int ( * ( * f ) ( ... ) ) (int) ;
// keep parentheses here: int ( * * ( * compilerHookVector ) (void) ) ( ) ;
// keep parentheses here: operator new [] (size_t);
// keep parentheses here: Functor()(a ... )
// keep parentheses here: ) ( var ) ;
if (Token::Match(tok->next(), "( %var% ) ;|)|,|]|%op%") &&
!tok->isName() &&
tok->str() != ">" &&
tok->str() != "]" &&
!Token::simpleMatch(tok->previous(), "operator") &&
!Token::simpleMatch(tok->previous(), "* )") &&
!Token::simpleMatch(tok->previous(), ") )") &&
!Token::Match(tok->tokAt(-2), "* %var% )") &&
!Token::Match(tok->tokAt(-2), "%type% ( ) ( %var%") &&
!Token::Match(tok, ") ( %var% ) ;")
) {
tok->deleteNext();
tok = tok->next();
tok->deleteNext();
ret = true;
}
if (tok->type() == Token::eChar &&
Token::Match(tok->previous(), "(|&&|%oror% %any% ==|!=|<=|<|>=|> %num% &&|%oror%|)")) {
tok->str(MathLib::toString(tok->str()[1] & 0xff));
}
if (tok->isNumber()) {
// Remove redundant conditions (0&&x) (1||x)
if (Token::Match(tok->previous(), "[(=,] 0 &&") ||
Token::Match(tok->previous(), "[(=,] 1 ||")) {
unsigned int par = 0;
const Token *tok2 = tok;
for (tok2 = tok; tok2; tok2 = tok2->next()) {
if (tok2->str() == "(")
++par;
else if (tok2->str() == ")") {
if (par == 0)
break;
--par;
} else if (par == 0 && (Token::Match(tok2, "[,;]")))
break;
}
if (Token::Match(tok2, "[);,]"))
Token::eraseTokens(tok, tok2);
continue;
}
if (tok->str() == "0") {
if (Token::Match(tok->previous(), "[+-|] 0")) {
tok = tok->previous();
if (Token::Match(tok->tokAt(-4), "[;{}] %var% = %var% [+-|] 0 ;") &&
tok->strAt(-3) == tok->previous()->str()) {
tok = tok->tokAt(-3);
tok->deleteNext(2);
tok->deleteThis();
}
tok->deleteNext();
tok->deleteThis();
ret = true;
} else if (Token::Match(tok->previous(), "[=([,] 0 [+|]") ||
Token::Match(tok->previous(), "return|case 0 [+|]")) {
tok->deleteNext();
tok->deleteThis();
ret = true;
} else if (Token::Match(tok->previous(), "[=[(,] 0 * %any% ,|]|)|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 0 * %any% ,|:|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 0 && %any% ,|:|;|=|%op%")) {
tok->deleteNext();
if (tok->next()->str() == "(")
Token::eraseTokens(tok, tok->next()->link());
tok->deleteNext();
ret = true;
} else if (Token::Match(tok->previous(), "[=[(,] 0 && *|& %any% ,|]|)|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 0 && *|& %any% ,|:|;|=|%op%")) {
tok->deleteNext();
tok->deleteNext();
if (tok->next()->str() == "(")
Token::eraseTokens(tok, tok->next()->link());
tok->deleteNext();
ret = true;
}
}
if (tok->str() == "1") {
if (Token::Match(tok->previous(), "[=[(,] 1 %oror% %any% ,|]|)|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 1 %oror% %any% ,|:|;|=|%op%")) {
tok->deleteNext();
if (tok->next()->str() == "(")
Token::eraseTokens(tok, tok->next()->link());
tok->deleteNext();
ret = true;
} else if (Token::Match(tok->previous(), "[=[(,] 1 %oror% *|& %any% ,|]|)|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 1 %oror% *|& %any% ,|:|;|=|%op%")) {
tok->deleteNext();
tok->deleteNext();
if (tok->next()->str() == "(")
Token::eraseTokens(tok, tok->next()->link());
tok->deleteNext();
ret = true;
}
}
if (Token::simpleMatch(tok->previous(), "* 1") || Token::simpleMatch(tok, "1 *")) {
if (tok->previous() && tok->previous()->isOp())
tok = tok->previous();
tok->deleteNext();
tok->deleteThis();
ret = true;
}
// Remove parentheses around number..
if (Token::Match(tok->tokAt(-2), "%any% ( %num% )") && !tok->tokAt(-2)->isName() && tok->strAt(-2) != ">") {
tok = tok->previous();
tok->deleteThis();
tok->deleteNext();
ret = true;
}
if (Token::simpleMatch(tok->previous(), "( 0 ||") ||
Token::simpleMatch(tok->previous(), "|| 0 )") ||
Token::simpleMatch(tok->previous(), "( 0 |") ||
Token::simpleMatch(tok->previous(), "| 0 )") ||
Token::simpleMatch(tok->previous(), "( 1 &&") ||
Token::simpleMatch(tok->previous(), "&& 1 )")) {
if (tok->previous()->isOp())
tok = tok->previous();
tok->deleteNext();
tok->deleteThis();
ret = true;
}
if (Token::Match(tok, "%num% ==|!=|<=|>=|<|> %num%") &&
MathLib::isInt(tok->str()) &&
MathLib::isInt(tok->strAt(2))) {
if (Token::Match(tok->previous(), "(|&&|%oror%") && Token::Match(tok->tokAt(3), ")|&&|%oror%")) {
const MathLib::bigint op1(MathLib::toLongNumber(tok->str()));
const std::string &cmp(tok->next()->str());
const MathLib::bigint op2(MathLib::toLongNumber(tok->strAt(2)));
std::string result;
if (cmp == "==")
result = (op1 == op2) ? "1" : "0";
else if (cmp == "!=")
result = (op1 != op2) ? "1" : "0";
else if (cmp == "<=")
result = (op1 <= op2) ? "1" : "0";
else if (cmp == ">=")
result = (op1 >= op2) ? "1" : "0";
else if (cmp == "<")
result = (op1 < op2) ? "1" : "0";
else if (cmp == ">")
result = (op1 > op2) ? "1" : "0";
tok->str(result);
tok->deleteNext(2);
ret = true;
}
}
}
// Division where result is a whole number
else if (Token::Match(tok->previous(), "* %num% /") &&
tok->str() == MathLib::multiply(tok->strAt(2), MathLib::divide(tok->str(), tok->strAt(2)))) {
tok->deleteNext(2);
}
else {
// (1-2)
while (tok->tokAt(4) && tok->next()->isNumber() && tok->tokAt(3)->isNumber()) { // %any% %num% %any% %num% %any%
const Token* op = tok->tokAt(2);
const Token* after = tok->tokAt(4);
if (Token::Match(tok, "* %num% /") && tok->next()->str() == MathLib::multiply(tok->strAt(3), MathLib::divide(tok->next()->str(), tok->strAt(3)))) {
// Division where result is a whole number
} else if (!((op->str() == "*" && (isLowerThanMulDiv(tok) || tok->str() == "*") && isLowerEqualThanMulDiv(after)) || // associative
(Token::Match(op, "[/%]") && isLowerThanMulDiv(tok) && isLowerEqualThanMulDiv(after)) || // NOT associative
(Token::Match(op, "[+-]") && isLowerThanMulDiv(tok) && isLowerThanMulDiv(after)) || // Only partially (+) associative, but handled later
(Token::Match(op, ">>|<<") && isLowerThanShift(tok) && isLowerThanPlusMinus(after)) || // NOT associative
(op->str() == "&" && isLowerThanShift(tok) && isLowerThanShift(after)) || // associative
(op->str() == "^" && isLowerThanAnd(tok) && isLowerThanAnd(after)) || // associative
(op->str() == "|" && isLowerThanXor(tok) && isLowerThanXor(after)))) // associative
break;
tok = tok->next();
// Don't simplify "%num% / 0"
if (Token::Match(op, "[/%] 0"))
continue;
// Integer operations
if (Token::Match(op, ">>|<<|&|^|%or%")) {
const char cop = op->str()[0];
const MathLib::bigint leftInt(MathLib::toLongNumber(tok->str()));
const MathLib::bigint rightInt(MathLib::toLongNumber(tok->strAt(2)));
std::string result;
if (cop == '&' || cop == '|' || cop == '^')
result = MathLib::calculate(tok->str(), tok->strAt(2), cop);
else if (cop == '<') {
if (tok->previous()->str() != "<<") // Ensure that its not a shift operator as used for streams
result = MathLib::toString<MathLib::bigint>(leftInt << rightInt);
} else
result = MathLib::toString<MathLib::bigint>(leftInt >> rightInt);
if (!result.empty()) {
ret = true;
tok->str(result);
tok->deleteNext(2);
continue;
}
}
else if (Token::Match(tok->previous(), "- %num% - %num%"))
tok->str(MathLib::add(tok->str(), tok->strAt(2)));
else if (Token::Match(tok->previous(), "- %num% + %num%"))
tok->str(MathLib::subtract(tok->str(), tok->strAt(2)));
else {
try {
tok->str(MathLib::calculate(tok->str(), tok->strAt(2), op->str()[0]));
} catch (InternalError &e) {
e.token = tok;
throw;
}
}
tok->deleteNext(2);
ret = true;
}
}
}
bool TemplateSimplifier::simplifyNumericCalculations(Token *tok)
{
bool ret = false;
// (1-2)
while (tok->tokAt(4) && tok->next()->isNumber() && tok->tokAt(3)->isNumber()) { // %any% %num% %any% %num% %any%
const Token* op = tok->tokAt(2);
const Token* after = tok->tokAt(4);
if (Token::Match(tok, "* %num% /") && (tok->strAt(3) != "0") && tok->next()->str() == MathLib::multiply(tok->strAt(3), MathLib::divide(tok->next()->str(), tok->strAt(3)))) {
// Division where result is a whole number
} else if (!((op->str() == "*" && (isLowerThanMulDiv(tok) || tok->str() == "*") && isLowerEqualThanMulDiv(after)) || // associative
(Token::Match(op, "[/%]") && isLowerThanMulDiv(tok) && isLowerEqualThanMulDiv(after)) || // NOT associative
(Token::Match(op, "[+-]") && isLowerThanMulDiv(tok) && isLowerThanMulDiv(after)) || // Only partially (+) associative, but handled later
(Token::Match(op, ">>|<<") && isLowerThanShift(tok) && isLowerThanPlusMinus(after)) || // NOT associative
(op->str() == "&" && isLowerThanShift(tok) && isLowerThanShift(after)) || // associative
(op->str() == "^" && isLowerThanAnd(tok) && isLowerThanAnd(after)) || // associative
(op->str() == "|" && isLowerThanXor(tok) && isLowerThanXor(after)))) // associative
break;
tok = tok->next();
// Don't simplify "%num% / 0"
if (Token::Match(op, "[/%] 0"))
continue;
// Integer operations
if (Token::Match(op, ">>|<<|&|^|%or%")) {
const char cop = op->str()[0];
const MathLib::bigint leftInt(MathLib::toLongNumber(tok->str()));
const MathLib::bigint rightInt(MathLib::toLongNumber(tok->strAt(2)));
std::string result;
if (cop == '&' || cop == '|' || cop == '^')
result = MathLib::calculate(tok->str(), tok->strAt(2), cop);
else if (cop == '<') {
if (tok->previous()->str() != "<<" && rightInt > 0) // Ensure that its not a shift operator as used for streams
result = MathLib::toString(leftInt << rightInt);
} else if (rightInt > 0)
result = MathLib::toString(leftInt >> rightInt);
if (!result.empty()) {
ret = true;
tok->str(result);
tok->deleteNext(2);
continue;
}
}
else if (Token::Match(tok->previous(), "- %num% - %num%"))
tok->str(MathLib::add(tok->str(), tok->strAt(2)));
else if (Token::Match(tok->previous(), "- %num% + %num%"))
tok->str(MathLib::subtract(tok->str(), tok->strAt(2)));
else {
try {
tok->str(MathLib::calculate(tok->str(), tok->strAt(2), op->str()[0]));
} catch (InternalError &e) {
e.token = tok;
throw;
}
}
tok->deleteNext(2);
ret = true;
}
static bool isLowerThanShift(const Token* lower)
{
return isLowerThanAnd(lower) || Token::Match(lower, "&|<|<=|>|>=|==|!=");
}
