Improved simplification of calculations:
- Use more generic patterns - Look on operator precedence more consequently -> Made a TODO test case from a test case that worked previously, because the calculation is simplified so that the problem isn't detected any more. Changed comment "Coding style checks" to "Checks", because it didn't fit
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PKEuS
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4f1f6e1824
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@ -49,7 +49,7 @@ public:
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
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CheckOther checkOther(tokenizer, settings, errorLogger);
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// Coding style checks
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// Checks
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checkOther.warningOldStylePointerCast();
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checkOther.invalidPointerCast();
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checkOther.checkUnsignedDivision();
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@ -69,10 +69,7 @@ public:
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checkOther.checkUnreachableCode();
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checkOther.checkSuspiciousSemicolon();
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checkOther.checkWrongPrintfScanfArguments();
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// information checks
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checkOther.checkVariableScope();
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checkOther.clarifyCondition(); // not simplified because ifAssign
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checkOther.checkComparisonOfBoolExpressionWithInt();
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}
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@ -81,9 +78,8 @@ public:
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
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CheckOther checkOther(tokenizer, settings, errorLogger);
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// Checks
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checkOther.clarifyCalculation();
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// Coding style checks
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checkOther.checkConstantFunctionParameter();
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checkOther.checkIncompleteStatement();
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@ -729,6 +729,35 @@ void TemplateSimplifier::simplifyTemplatesExpandTemplate(
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}
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}
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static bool isLowerThanOr(const Token* lower)
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{
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return lower->isAssignmentOp() || Token::Match(lower, ";|(|[|]|)|,|?|:|%oror%|&&|return|throw|case");
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}
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static bool isLowerThanXor(const Token* lower)
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{
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return isLowerThanOr(lower) || lower->str() == "|";
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}
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static bool isLowerThanAnd(const Token* lower)
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{
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return isLowerThanXor(lower) || lower->str() == "^";
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}
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static bool isLowerThanShift(const Token* lower)
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{
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return isLowerThanAnd(lower) || Token::Match(lower, "&|<|<=|>|>=|==|!=");
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}
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static bool isLowerThanPlusMinus(const Token* lower)
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{
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return isLowerThanShift(lower) || lower->str() == "<<" || lower->str() == ">>";
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}
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static bool isLowerThanMulDiv(const Token* lower)
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{
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return isLowerThanPlusMinus(lower) || lower->str() == "+" || lower->str() == "-";
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}
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static bool isLowerEqualThanMulDiv(const Token* lower)
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{
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return isLowerThanMulDiv(lower) || Token::Match(lower, "[*/%]");
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}
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// TODO: This is not the correct class for simplifyCalculations(), so it
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// should be moved away.
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bool TemplateSimplifier::simplifyCalculations(Token *_tokens)
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@ -879,52 +908,55 @@ bool TemplateSimplifier::simplifyCalculations(Token *_tokens)
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ret = true;
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}
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}
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if (Token::Match(tok->previous(), "[([,=] %num% <<|>> %num%")) {
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const MathLib::bigint op1(MathLib::toLongNumber(tok->str()));
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const MathLib::bigint op2(MathLib::toLongNumber(tok->strAt(2)));
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MathLib::bigint result;
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if (tok->next()->str() == "<<")
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result = op1 << op2;
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else
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result = op1 >> op2;
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std::ostringstream ss;
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ss << result;
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tok->str(ss.str());
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tok->deleteNext(2);
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}
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}
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// Division where result is a whole number
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else if (Token::Match(tok->previous(), "* %num% /") &&
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tok->str() == MathLib::multiply(tok->strAt(2), MathLib::divide(tok->str(), tok->strAt(2)))) {
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tok->deleteNext(2);
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}
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else if (tok->next() && tok->next()->isNumber()) {
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else {
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// (1-2)
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while (Token::Match(tok, "[[,(=<>+-*|&^] %num% [+-*/] %num% ]|,|)|;|=|%op%") ||
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Token::Match(tok, "<< %num% [+-*/] %num% ]|,|)|;|=|%op%") ||
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Token::Match(tok, "[[,(=<>+-*|&^] %num% [+-*/] %num% <<|>>") ||
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Token::Match(tok, "<< %num% [+-*/] %num% <<") ||
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Token::Match(tok, "[(,[] %num% [|&^] %num% [];,);]") ||
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Token::Match(tok, "(|%op% %num% [+-*/] %num% )|%op%") ||
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Token::Match(tok,"return|case %num% [+-*/] %num% ;|,|=|:|%op%")) {
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while (tok->tokAt(4) && tok->next()->isNumber() && tok->tokAt(3)->isNumber()) { // %any% %num% %any% %num% %any%
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const Token* op = tok->tokAt(2);
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const Token* after = tok->tokAt(4);
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if (Token::Match(tok, "* %num% /") && tok->next()->str() == MathLib::multiply(tok->strAt(3), MathLib::divide(tok->next()->str(), tok->strAt(3)))) {
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// Division where result is a whole number
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} else if (!((op->str() == "*" && isLowerEqualThanMulDiv(tok) && isLowerEqualThanMulDiv(after)) || // associative
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(Token::Match(op, "[/%]") && isLowerThanMulDiv(tok) && isLowerEqualThanMulDiv(after)) || // NOT associative
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(Token::Match(op, "[+-]") && isLowerThanMulDiv(tok) && isLowerThanMulDiv(after)) || // Only partially (+) associative, but handled later
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(Token::Match(op, ">>|<<") && isLowerThanShift(tok) && isLowerThanPlusMinus(after)) || // NOT associative
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(op->str() == "&" && isLowerThanShift(tok) && isLowerThanShift(after)) || // associative
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(op->str() == "^" && isLowerThanAnd(tok) && isLowerThanAnd(after)) || // associative
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(op->str() == "|" && isLowerThanXor(tok) && isLowerThanXor(after)))) // associative
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break;
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tok = tok->next();
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// Don't simplify "%num% / 0"
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if (Token::simpleMatch(tok->next(), "/ 0"))
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if (Token::Match(op, "[/%] 0"))
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continue;
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// & | ^
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if (Token::Match(tok->next(), "[&|^]")) {
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// Integer operations
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if (Token::Match(op, ">>|<<|&|%or%|^|%")) {
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const char cop = op->str()[0];
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const MathLib::bigint leftInt(MathLib::toLongNumber(tok->str()));
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const MathLib::bigint rightInt(MathLib::toLongNumber(tok->strAt(2)));
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std::string result;
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const std::string first(tok->str());
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const std::string second(tok->strAt(2));
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const char op = tok->next()->str()[0];
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if (op == '&')
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result = MathLib::toString<MathLib::bigint>(MathLib::toLongNumber(first) & MathLib::toLongNumber(second));
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else if (op == '|')
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result = MathLib::toString<MathLib::bigint>(MathLib::toLongNumber(first) | MathLib::toLongNumber(second));
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else if (op == '^')
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result = MathLib::toString<MathLib::bigint>(MathLib::toLongNumber(first) ^ MathLib::toLongNumber(second));
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if (cop == '&')
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result = MathLib::toString<MathLib::bigint>(leftInt & rightInt);
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else if (cop == '|')
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result = MathLib::toString<MathLib::bigint>(leftInt | rightInt);
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else if (cop == '^')
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result = MathLib::toString<MathLib::bigint>(leftInt ^ rightInt);
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else if (cop == '%')
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result = MathLib::toString<MathLib::bigint>(leftInt % rightInt);
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else if (cop == '<') {
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if (tok->previous()->str() != "<<") // Ensure that its not a shift operator as used for streams
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result = MathLib::toString<MathLib::bigint>(leftInt << rightInt);
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} else
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result = MathLib::toString<MathLib::bigint>(leftInt >> rightInt);
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if (!result.empty()) {
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ret = true;
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@ -934,26 +966,13 @@ bool TemplateSimplifier::simplifyCalculations(Token *_tokens)
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}
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}
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// Division where result is a whole number
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if (Token::Match(tok->previous(), "* %num% /") &&
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tok->str() == MathLib::multiply(tok->strAt(2), MathLib::divide(tok->str(), tok->strAt(2)))) {
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}
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// + and - are calculated after * and /
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else if (Token::Match(tok->next(), "[+-/]")) {
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if (Token::Match(tok->previous(), "[*/%]"))
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continue;
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if (Token::Match(tok->tokAt(3), "[*/%]"))
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continue;
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}
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if (Token::Match(tok->previous(), "- %num% - %num%"))
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else if (Token::Match(tok->previous(), "- %num% - %num%"))
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tok->str(MathLib::add(tok->str(), tok->strAt(2)));
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else if (Token::Match(tok->previous(), "- %num% + %num%"))
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tok->str(MathLib::subtract(tok->str(), tok->strAt(2)));
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else {
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try {
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tok->str(MathLib::calculate(tok->str(), tok->strAt(2), tok->next()->str()[0]));
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tok->str(MathLib::calculate(tok->str(), tok->strAt(2), op->str()[0]));
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} catch (InternalError &e) {
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e.token = tok;
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throw;
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@ -962,14 +981,6 @@ bool TemplateSimplifier::simplifyCalculations(Token *_tokens)
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tok->deleteNext(2);
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// evaluate "2 + 2 - 2 - 2"
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// as (((2 + 2) - 2) - 2) = 0
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// instead of ((2 + 2) - (2 - 2)) = 4
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if (Token::Match(tok->next(), "[+-*/]")) {
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tok = tok->previous();
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continue;
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}
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ret = true;
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}
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}
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@ -3359,9 +3359,9 @@ private:
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ASSERT_EQUALS("", errout.str());
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check("void f(char c) {\n"
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" printf(\"%i\", 1 + 1 ? 1 : 2);\n"
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" printf(\"%i\", 1 + 1 ? 1 : 2);\n" // "1+1" is simplified away
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"}");
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ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for + and ?\n", errout.str());
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TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for + and ?\n", "", errout.str()); // TODO: Is that really necessary, or is this pattern too unlikely?
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check("void f() {\n"
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" std::cout << x << 1 ? 2 : 3;\n"
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