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Do not warn about alloca() in C89 mode (#7558)

This commit is contained in:
PKEuS 2016-06-20 09:30:41 +02:00
parent 721bc32b2d
commit dde6f5eaea
2 changed files with 14 additions and 7 deletions
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5
lib/checkfunctions.cpp
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@ -48,13 +48,14 @@ void CheckFunctions::checkProhibitedFunctions()
if (tok->isName() && tok->varId() == 0 && tok->strAt(1) == "(") { if (tok->isName() && tok->varId() == 0 && tok->strAt(1) == "(") {
// alloca() is special as it depends on the code being C or C++, so it is not in Library // alloca() is special as it depends on the code being C or C++, so it is not in Library
if (checkAlloca && Token::simpleMatch(tok, "alloca (") && (!tok->function() || tok->function()->nestedIn->type == Scope::eGlobal)) { if (checkAlloca && Token::simpleMatch(tok, "alloca (") && (!tok->function() || tok->function()->nestedIn->type == Scope::eGlobal)) {
if (_tokenizer->isC()) if (_tokenizer->isC()) {
if (_settings->standards.c > Standards::C89)
reportError(tok, Severity::warning, "allocaCalled", reportError(tok, Severity::warning, "allocaCalled",
"Obsolete function 'alloca' called. In C99 and later it is recommended to use a variable length array instead.\n" "Obsolete function 'alloca' called. In C99 and later it is recommended to use a variable length array instead.\n"
"The obsolete function 'alloca' is called. In C99 and later it is recommended to use a variable length array or " "The obsolete function 'alloca' is called. In C99 and later it is recommended to use a variable length array or "
"a dynamically allocated array instead. The function 'alloca' is dangerous for many reasons " "a dynamically allocated array instead. The function 'alloca' is dangerous for many reasons "
"(http://stackoverflow.com/questions/1018853/why-is-alloca-not-considered-good-practice and http://linux.die.net/man/3/alloca)."); "(http://stackoverflow.com/questions/1018853/why-is-alloca-not-considered-good-practice and http://linux.die.net/man/3/alloca).");
else } else
reportError(tok, Severity::warning, "allocaCalled", reportError(tok, Severity::warning, "allocaCalled",
"Obsolete function 'alloca' called.\n" "Obsolete function 'alloca' called.\n"
"The obsolete function 'alloca' is called. In C++11 and later it is recommended to use std::array<> or " "The obsolete function 'alloca' is called. In C++11 and later it is recommended to use std::array<> or "

6
test/testfunctions.cpp
View File

@ -246,6 +246,12 @@ private:
"}", "test.cpp"); // #4382 - there are no VLAs in C++ "}", "test.cpp"); // #4382 - there are no VLAs in C++
ASSERT_EQUALS("", errout.str()); ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char *x = alloca(10);\n"
"}", "test.c"); // #7558 - no alternative to alloca in C89
ASSERT_EQUALS("", errout.str());
check("void f()\n" check("void f()\n"
"{\n" "{\n"
" char *x = alloca(10);\n" " char *x = alloca(10);\n"