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constPointer; Improved checking dereferenced pointer is used in calculation/comparison

This commit is contained in:
Daniel Marjamäki 2021-07-20 10:38:38 +02:00
parent 4d23c02320
commit fb5ab5e439
2 changed files with 28 additions and 20 deletions
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19
lib/checkother.cpp
View File

@ -1471,7 +1471,6 @@ void CheckOther::checkConstPointer()
if (nonConstPointers.find(tok->variable()) != nonConstPointers.end())
continue;
pointers.insert(tok->variable());
bool nonConst = true;
const Token *parent = tok->astParent();
bool deref = false;
if (parent && parent->isUnaryOp("*"))
@ -1479,26 +1478,26 @@ void CheckOther::checkConstPointer()
else if (Token::simpleMatch(parent, "[") && parent->astOperand1() == tok)
deref = true;
if (deref) {
while (Token::Match(parent->astParent(), "%cop%") && parent->astParent()->isBinaryOp())
parent = parent->astParent();
if (Token::Match(parent->astParent(), "%cop%") && !parent->astParent()->isUnaryOp("&") && !parent->astParent()->isUnaryOp("*"))
continue;
if (Token::simpleMatch(parent->astParent(), "return"))
nonConst = false;
continue;
else if (Token::Match(parent->astParent(), "%assign%") && parent == parent->astParent()->astOperand2()) {
bool takingRef = false;
const Token *lhs = parent->astParent()->astOperand1();
if (lhs && lhs->variable() && lhs->variable()->isReference() && lhs->variable()->nameToken() == lhs)
takingRef = true;
nonConst = takingRef;
if (!takingRef)
continue;
} else if (Token::simpleMatch(parent->astParent(), "[") && parent->astParent()->astOperand2() == parent)
nonConst = false;
continue;
} else {
if (Token::Match(parent, "%oror%|%comp%|&&|?|!|-"))
nonConst = false;
continue;
else if (Token::simpleMatch(parent, "(") && Token::Match(parent->astOperand1(), "if|while"))
nonConst = false;
continue;
}
if (nonConst)
nonConstPointers.insert(tok->variable());
nonConstPointers.insert(tok->variable());
}
for (const Variable *p: pointers) {
if (nonConstPointers.find(p) == nonConstPointers.end())

29
test/testother.cpp
View File

@ -2665,6 +2665,15 @@ private:
check("void foo(int *p) { if (!p) {} }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared with const\n", errout.str());
check("void foo(int *p) { if (*p > 123) {} }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared with const\n", errout.str());
check("void foo(int *p) { return *p + 1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared with const\n", errout.str());
check("void foo(int *p) { return *p > 1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared with const\n", errout.str());
}
void switchRedundantAssignmentTest() {
@ -3858,7 +3867,7 @@ private:
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
check("void foo(int* c) {\n"
check("void foo(const int* c) {\n"
" if (x) *c == 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
@ -5548,7 +5557,7 @@ private:
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f2(bool *a) {\n"
check("void f2(const bool *a) {\n"
" const bool b = *a;\n"
" if( *a == !(b) ) {}\n"
" if( b == !(*a) ) {}\n"
@ -5602,25 +5611,25 @@ private:
"}");
ASSERT_EQUALS("", errout.str());
check("void f(bool *a) {\n"
check("void f(const bool *a) {\n"
" const bool b = a[42];\n"
" if( b == !(a[42]) ) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(bool *a) {\n"
check("void f(const bool *a) {\n"
" const bool b = a[42];\n"
" if( a[42] == !(b) ) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(bool *a) {\n"
check("void f(const bool *a) {\n"
" const bool b = *a;\n"
" if( b == !(*a) ) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(bool *a) {\n"
check("void f(const bool *a) {\n"
" const bool b = *a;\n"
" if( *a == !(b) ) {}\n"
"}\n");
@ -6296,7 +6305,7 @@ private:
check(code, nullptr, false, false, true, true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) A pointer can not be negative so it is either pointless or an error to check if it is not.\n", errout.str());
}
check("void foo(int* x) {\n"
check("void foo(const int* x) {\n"
" if (*x >= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
@ -6318,7 +6327,7 @@ private:
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) A pointer can not be negative so it is either pointless or an error to check if it is.\n", errout.str());
}
check("void foo(int* x) {\n"
check("void foo(const int* x) {\n"
" if (*x < 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
@ -6420,7 +6429,7 @@ private:
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int* x) {\n"
check("void foo(const int* x) {\n"
" if (0 <= x[0]) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
@ -6445,7 +6454,7 @@ private:
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) A pointer can not be negative so it is either pointless or an error to check if it is.\n", errout.str());
check("void foo(int* x) {\n"
check("void foo(const int* x) {\n"
" if (0 > x[0]) {}\n"
"}");
ASSERT_EQUALS("", errout.str());