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Fixed #6670 (Analysis failed when there are {} in LHS in compound assignment)

This commit is contained in:
Daniel Marjamäki 2015-07-27 13:44:35 +02:00
parent 35eb1a393d
commit 05a21d45eb
3 changed files with 88 additions and 87 deletions
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170
lib/tokenize.cpp
View File

@ -4572,104 +4572,104 @@ void Tokenizer::simplifyCompoundAssignment()
// Simplify compound assignments:
// "a+=b" => "a = a + b"
for (Token *tok = list.front(); tok; tok = tok->next()) {
if (Token::Match(tok, "[;{}] (| *| (| %name%")) {
// backup current token..
Token * const tok1 = tok;
if (!Token::Match(tok, "[;{}] (| *| (| %name%"))
continue;
// backup current token..
Token * const tok1 = tok;
if (tok->next()->str() == "*")
tok = tok->next();
if (tok->next()->str() == "*")
tok = tok->next();
if (tok->next() && tok->next()->str() == "(") {
tok = tok->next()->link()->next();
} else {
// variable..
tok = tok->tokAt(2);
while (Token::Match(tok, ". %name%") ||
Token::Match(tok, "[|(")) {
if (tok->str() == ".")
tok = tok->tokAt(2);
else {
// goto "]" or ")"
tok = tok->link();
if (tok->next() && tok->next()->str() == "(") {
tok = tok->next()->link()->next();
} else {
// variable..
tok = tok->tokAt(2);
while (Token::Match(tok, ". %name%") ||
Token::Match(tok, "[|(")) {
if (tok->str() == ".")
tok = tok->tokAt(2);
else {
// goto "]" or ")"
tok = tok->link();
// goto next token..
tok = tok ? tok->next() : 0;
}
// goto next token..
tok = tok ? tok->next() : 0;
}
}
if (!tok)
break;
}
if (!tok)
break;
// Is current token at a compound assignment: +=|-=|.. ?
const std::string &str = tok->str();
std::string op; // operator used in assignment
if (tok->isAssignmentOp() && str.size() == 2)
op = str.substr(0, 1);
else if (tok->isAssignmentOp() && str.size() == 3)
op = str.substr(0, 2);
else {
tok = tok1;
continue;
// Is current token at a compound assignment: +=|-=|.. ?
const std::string &str = tok->str();
std::string op; // operator used in assignment
if (tok->isAssignmentOp() && str.size() == 2)
op = str.substr(0, 1);
else if (tok->isAssignmentOp() && str.size() == 3)
op = str.substr(0, 2);
else {
tok = tok1;
continue;
}
// Remove the whole statement if it says: "+=0;", "-=0;", "*=1;" or "/=1;"
if (Token::Match(tok, "+=|-= 0 ;") ||
Token::simpleMatch(tok, "|= 0 ;") ||
Token::Match(tok, "*=|/= 1 ;")) {
tok = tok1;
while (tok->next()->str() != ";")
tok->deleteNext();
} else {
// Enclose the rhs in parentheses..
if (!Token::Match(tok->tokAt(2), "[;)]")) {
// Only enclose rhs in parentheses if there is some operator
bool someOperator = false;
for (Token *tok2 = tok->next(); tok2; tok2 = tok2->next()) {
if (tok2->str() == "(")
tok2 = tok2->link();
if (Token::Match(tok2->next(), "[;)]")) {
if (someOperator) {
tok->insertToken("(");
tok2->insertToken(")");
Token::createMutualLinks(tok->next(), tok2->next());
}
break;
}
someOperator |= (tok2->isOp() || tok2->str() == "?");
}
}
// Remove the whole statement if it says: "+=0;", "-=0;", "*=1;" or "/=1;"
if (Token::Match(tok, "+=|-= 0 ;") ||
Token::simpleMatch(tok, "|= 0 ;") ||
Token::Match(tok, "*=|/= 1 ;")) {
tok = tok1;
while (tok->next()->str() != ";")
tok->deleteNext();
} else {
// Enclose the rhs in parentheses..
if (!Token::Match(tok->tokAt(2), "[;)]")) {
// Only enclose rhs in parentheses if there is some operator
bool someOperator = false;
for (Token *tok2 = tok->next(); tok2; tok2 = tok2->next()) {
if (tok2->str() == "(")
tok2 = tok2->link();
// simplify the compound assignment..
tok->str("=");
tok->insertToken(op);
if (Token::Match(tok2->next(), "[;)]")) {
if (someOperator) {
tok->insertToken("(");
tok2->insertToken(")");
Token::createMutualLinks(tok->next(), tok2->next());
}
break;
}
someOperator |= (tok2->isOp() || tok2->str() == "?");
}
}
// simplify the compound assignment..
tok->str("=");
tok->insertToken(op);
std::stack<Token *> tokend;
for (Token *tok2 = tok->previous(); tok2 && tok2 != tok1; tok2 = tok2->previous()) {
// Don't duplicate ++ and --. Put preincrement in lhs. Put
// postincrement in rhs.
if (tok2->type() == Token::eIncDecOp) {
// pre increment/decrement => don't copy
if (tok2->next()->isName()) {
continue;
}
// post increment/decrement => move from lhs to rhs
tok->insertToken(tok2->str());
tok2->deleteThis();
std::stack<Token *> tokend;
for (Token *tok2 = tok->previous(); tok2 && tok2 != tok1; tok2 = tok2->previous()) {
// Don't duplicate ++ and --. Put preincrement in lhs. Put
// postincrement in rhs.
if (tok2->type() == Token::eIncDecOp) {
// pre increment/decrement => don't copy
if (tok2->next()->isName()) {
continue;
}
// Copy token from lhs to rhs
// post increment/decrement => move from lhs to rhs
tok->insertToken(tok2->str());
tok->next()->varId(tok2->varId());
if (Token::Match(tok->next(), "]|)"))
tokend.push(tok->next());
else if (Token::Match(tok->next(), "(|[")) {
Token::createMutualLinks(tok->next(), tokend.top());
tokend.pop();
}
tok2->deleteThis();
continue;
}
// Copy token from lhs to rhs
tok->insertToken(tok2->str());
tok->next()->varId(tok2->varId());
if (Token::Match(tok->next(), "]|)|}"))
tokend.push(tok->next());
else if (Token::Match(tok->next(), "(|[|{")) {
Token::createMutualLinks(tok->next(), tokend.top());
tokend.pop();
}
}
}

4
test/testgarbage.cpp
View File

@ -582,7 +582,7 @@ private:
}
void garbageCode49() { // #6715
ASSERT_THROW(checkCode(" ( ( ) ) { } ( { ( __builtin_va_arg_pack ( ) ) ; } ) { ( int { ( ) ( ( ) ) } ( ) { } ( ) ) += ( ) }"), InternalError);
checkCode(" ( ( ) ) { } ( { ( __builtin_va_arg_pack ( ) ) ; } ) { ( int { ( ) ( ( ) ) } ( ) { } ( ) ) += ( ) }");
}
void garbageCode50() { // #6718
@ -735,7 +735,7 @@ private:
}
void garbageCode87() { // #6788
ASSERT_THROW(checkCode("((X (128))) (int a) { v[ = {} (x 42) a] += }"), InternalError); // do not crash
checkCode("((X (128))) (int a) { v[ = {} (x 42) a] += }"); // do not crash
}
void garbageCode88() { // #6786

1
test/testtokenize.cpp
View File

@ -6024,6 +6024,7 @@ private:
ASSERT_EQUALS("; * p = * p + y ;", tokenizeAndStringify("; *p += y;"));
ASSERT_EQUALS("; ( * p ) = ( * p ) + y ;", tokenizeAndStringify("; (*p) += y;"));
ASSERT_EQUALS("; * ( p [ 0 ] ) = * ( p [ 0 ] ) + y ;", tokenizeAndStringify("; *(p[0]) += y;"));
ASSERT_EQUALS("; p [ { 1 , 2 } ] = p [ { 1 , 2 } ] + y ;", tokenizeAndStringify("; p[{1,2}] += y;"));
ASSERT_EQUALS("void foo ( ) { switch ( n ) { case 0 : ; x = x + y ; break ; } }", tokenizeAndStringify("void foo() { switch (n) { case 0: x += y; break; } }"));