walkero
/
cppcheck
1
0
Fork 0
Code Issues Pull Requests Projects Releases 1 Wiki Activity

Fixed #2325 (Tokenizer: Remove for-loop if condition is false)

This commit is contained in:
Daniel Marjamäki 2010-12-18 21:43:12 +01:00
parent a2aa601899
commit 41ac2c252f
2 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
lib/tokenize.cpp
View File

@ -8176,10 +8176,18 @@ void Tokenizer::simplifyWhile0()
{
for (Token *tok = _tokens; tok; tok = tok->next())
{
if (!Token::simpleMatch(tok, "while ( 0 )"))
// while (0)
const bool while0(Token::Match(tok, "while ( 0|false )"));
// for (0)
const bool for0(Token::Match(tok, "for ( %var% = %num% ; %var% < %num% ;") &&
tok->strAt(2) == tok->strAt(6) &&
tok->strAt(4) == tok->strAt(8));
if (!while0 && !for0)
continue;
if (Token::simpleMatch(tok->previous(), "}"))
if (while0 && Token::simpleMatch(tok->previous(), "}"))
{
// find "do"
Token *tok2 = tok->previous()->link();
@ -8203,9 +8211,9 @@ void Tokenizer::simplifyWhile0()
}
// remove "while (0) { .. }"
if (Token::simpleMatch(tok->tokAt(4), "{"))
if (Token::simpleMatch(tok->next()->link(), ") {"))
{
const Token *end = tok->tokAt(4)->link();
const Token *end = tok->next()->link()->next()->link();
if (!findmatch(tok, end, "continue|break"))
{
Token::eraseTokens(tok, end ? end->next() : 0);

4
test/testsimplifytokens.cpp
View File

@ -5469,6 +5469,10 @@ private:
ASSERT_EQUALS("; x = 1 ;", tok("; do { x = 1 ; } while (0);"));
ASSERT_EQUALS("; do { continue ; } while ( false ) ;", tok("; do { continue ; } while (0);"));
ASSERT_EQUALS("; do { break ; } while ( false ) ;", tok("; do { break; } while (0);"));
ASSERT_EQUALS(";", tok("; while (false) { a; }"));
// for (condition is always false)
ASSERT_EQUALS("void f ( ) { ; }", tok("void f() { int i; for (i = 0; i < 0; i++) { a; } }"));
}
void while1()