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Fix another FP divideSizeof (#4009) 

* Fix FP divideSizeof

* Format

* Undo

* simpleMatch

* Fix another FP divideSizeof
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chrchr-github 2022-04-13 12:24:35 +02:00 committed by GitHub
parent 32978933b5
commit ea65fe2b63
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2 changed files with 20 additions and 16 deletions
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20
lib/checksizeof.cpp
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@ -378,22 +378,16 @@ void CheckSizeof::suspiciousSizeofCalculation()
const Token* lPar = tok->astParent();
if (lPar && lPar->str() == "(") {
const Token* const rPar = lPar->link();
const Token* varTok = rPar->previous();
while (varTok && varTok->str() == "]")
varTok = varTok->link()->previous();
const Token* varTok = lPar->astOperand2();
int derefCount = 0;
while (Token::Match(varTok, "[|*")) {
++derefCount;
varTok = varTok->astOperand1();
}
if (lPar->astParent() && lPar->astParent()->str() == "/") {
const Variable* var = varTok ? varTok->variable() : nullptr;
if (var && var->isPointer() && !var->isArray() && !(lPar->astOperand2() && lPar->astOperand2()->str() == "*"))
if (var && var->isPointer() && !var->isArray() && !(var->valueType() && var->valueType()->pointer <= derefCount))
divideSizeofError(tok);
else if (varTok && varTok->str() == "*") {
const Token* arrTok = lPar->astParent()->astOperand1();
arrTok = arrTok ? arrTok->astOperand2() : nullptr;
while (Token::simpleMatch(arrTok, "."))
arrTok = arrTok->astOperand2();
var = arrTok ? arrTok->variable() : nullptr;
if (var && var->isPointer() && !var->isArray())
divideSizeofError(tok);
}
}
else if (Token::simpleMatch(rPar, ") * sizeof") && rPar->next()->astOperand1() == tok->next())
multiplySizeofError(tok);

16
test/testsizeof.cpp
View File

@ -440,11 +440,10 @@ private:
"}\n");
ASSERT_EQUALS("", errout.str());
check("int f(const S& s) {\n"
" int** p;\n"
check("int f(int** p) {\n"
" return sizeof(p[0]) / 4;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Division of result of sizeof() on pointer type.\n", errout.str());
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Division of result of sizeof() on pointer type.\n", errout.str());
check("struct S {\n"
" unsigned char* s;\n"
@ -466,6 +465,17 @@ private:
" for (int i = 0; i != sizeof(s->t[0].c) / sizeof(char*); i++) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int32_t* buf, size_t len) {\n"
" for (int i = 0; i < len / sizeof(buf[0]); i++) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int32_t*** buf, size_t len) {\n"
" for (int i = 0; i < len / sizeof(**buf[0]); i++) {}\n"
" for (int i = 0; i < len / sizeof(*buf[0][0]); i++) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void checkPointerSizeof() {