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Revert "Fixed #7619 (False positive: Redundant assignment)" 

There is a crash I need to look into.
This commit is contained in:
Daniel Marjamäki 2018-11-20 06:23:43 +01:00
parent 399fef17ca
commit a5af5b2d08
1 changed files with 22 additions and 36 deletions
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58
lib/checkother.cpp
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@ -473,7 +473,6 @@ static bool checkExceptionHandling(const Token* tok)
void CheckOther::checkRedundantAssignment() void CheckOther::checkRedundantAssignment()
{ {
// TODO: Rewrite this messy checker.
const bool printPerformance = mSettings->isEnabled(Settings::PERFORMANCE); const bool printPerformance = mSettings->isEnabled(Settings::PERFORMANCE);
const bool printStyle = mSettings->isEnabled(Settings::STYLE); const bool printStyle = mSettings->isEnabled(Settings::STYLE);
const bool printWarning = mSettings->isEnabled(Settings::WARNING); const bool printWarning = mSettings->isEnabled(Settings::WARNING);
@ -492,7 +491,6 @@ void CheckOther::checkRedundantAssignment()
std::map<unsigned int, const Token*> memAssignments; std::map<unsigned int, const Token*> memAssignments;
std::map<unsigned int, std::set<unsigned int> > membervars; std::map<unsigned int, std::set<unsigned int> > membervars;
std::set<unsigned int> initialized; std::set<unsigned int> initialized;
std::map<unsigned int, std::set<unsigned int>> dependencies;
const Token* writtenArgumentsEnd = nullptr; const Token* writtenArgumentsEnd = nullptr;
for (const Token* tok = scope.bodyStart->next(); tok && tok != scope.bodyEnd; tok = tok->next()) { for (const Token* tok = scope.bodyStart->next(); tok && tok != scope.bodyEnd; tok = tok->next()) {
@ -505,18 +503,15 @@ void CheckOther::checkRedundantAssignment()
break; break;
varAssignments.clear(); varAssignments.clear();
memAssignments.clear(); memAssignments.clear();
dependencies.clear();
} else if (tok->str() == "{" && tok->strAt(-1) != "{" && tok->strAt(-1) != "=" && tok->strAt(-4) != "case" && tok->strAt(-3) != "default") { // conditional or non-executable inner scope: Skip it and reset status } else if (tok->str() == "{" && tok->strAt(-1) != "{" && tok->strAt(-1) != "=" && tok->strAt(-4) != "case" && tok->strAt(-3) != "default") { // conditional or non-executable inner scope: Skip it and reset status
tok = tok->link(); tok = tok->link();
varAssignments.clear(); varAssignments.clear();
memAssignments.clear(); memAssignments.clear();
dependencies.clear();
} else if (Token::Match(tok, "for|if|while (")) { } else if (Token::Match(tok, "for|if|while (")) {
tok = tok->linkAt(1); tok = tok->linkAt(1);
} else if (Token::Match(tok, "break|return|continue|throw|goto|asm")) { } else if (Token::Match(tok, "break|return|continue|throw|goto|asm")) {
varAssignments.clear(); varAssignments.clear();
memAssignments.clear(); memAssignments.clear();
dependencies.clear();
} else if (Token::Match(tok, "%var% = [ & ] (")) { } else if (Token::Match(tok, "%var% = [ & ] (")) {
const unsigned int lambdaId = tok->varId(); const unsigned int lambdaId = tok->varId();
const Token *lambdaParams = tok->tokAt(5); const Token *lambdaParams = tok->tokAt(5);
@ -528,38 +523,29 @@ void CheckOther::checkRedundantAssignment()
usedByLambda[lambdaId].insert(tok2->varId()); usedByLambda[lambdaId].insert(tok2->varId());
} }
} }
} else if (tok->tokType() == Token::eVariable && !Token::Match(tok, "%var% (")) { } else if (tok->tokType() == Token::eVariable && !Token::Match(tok, "%name% (")) {
const Token *eq = tok; const Token *eq = nullptr;
while (Token::Match(eq->astParent(), ".|::|[")) for (const Token *tok2 = tok; tok2; tok2 = tok2->next()) {
eq = eq->astParent(); if (Token::Match(tok2, "[([]")) {
if (Token::simpleMatch(eq->astParent(), "=") && eq == eq->astParent()->astOperand1()) // bail out if there is a variable in rhs - we only track 1 variable
eq = eq->astParent(); bool bailout = false;
else for (const Token *tok3 = tok2->link(); tok3 != tok2; tok3 = tok3->previous()) {
eq = nullptr; if (tok3->varId()) {
const Variable *var = tok3->variable();
if (eq) { if (!var || !var->isConst() || var->isReference() || var->isPointer()) {
for (const Token *tok2 = tok->next(); tok2 != eq; tok2 = tok2->next()) { bailout = true;
if (tok2->str() == "[") break;
tok2 = tok2->link(); }
else if (tok2->str() == "]") { }
eq = nullptr;
break;
} }
} if (bailout)
} break;
tok2 = tok2->link();
if (eq) { } else if (Token::Match(tok2, "[)];,]"))
bool arrayIndex = false; break;
for (const Token *tok2 = tok->next(); tok2 != eq; tok2 = tok2->next()) { else if (tok2->str() == "=") {
if (tok2->str() == "[") eq = tok2;
arrayIndex = true; break;
if (arrayIndex && tok2->varId() != 0)
dependencies[tok2->varId()].insert(tok->varId());
}
for (unsigned int varId : dependencies[tok->varId()]) {
varAssignments.erase(varId);
memAssignments.erase(varId);
} }
} }