Fix 10570: Improve check; condition then pointer dereference, different pointers (#4216)
* Try to use after assign in loop * Update valueflow forward to handle init tokens * Fix tests * Make test TODO * Format * Add tests * Format * Fix ubsan error * Use simpleMatch
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@ -575,6 +575,22 @@ struct ForwardTraversal {
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tok = nextAfterAstRightmostLeaf(assignTok);
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tok = nextAfterAstRightmostLeaf(assignTok);
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if (!tok)
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if (!tok)
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return Break();
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return Break();
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} else if (Token::simpleMatch(tok, ") {") && Token::Match(tok->link()->previous(), "for|while (")) {
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// In the middle of a loop structure so bail
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return Break(Analyzer::Terminate::Bail);
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} else if (tok->str() == ";" && tok->astParent()) {
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Token* top = tok->astTop();
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if (top && Token::Match(top->previous(), "for|while (") && Token::simpleMatch(top->link(), ") {")) {
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Token* endCond = top->link();
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Token* endBlock = endCond->linkAt(1);
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Token* condTok = getCondTok(top);
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Token* stepTok = getStepTok(top);
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// The semicolon should belong to the initTok otherwise something went wrong, so just bail
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if (tok->astOperand2() != condTok && !Token::simpleMatch(tok->astOperand2(), ";"))
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return Break(Analyzer::Terminate::Bail);
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if (updateLoop(end, endBlock, condTok, nullptr, stepTok) == Progress::Break)
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return Break();
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}
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} else if (tok->str() == "break") {
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} else if (tok->str() == "break") {
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const Token *scopeEndToken = findNextTokenFromBreak(tok);
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const Token *scopeEndToken = findNextTokenFromBreak(tok);
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if (!scopeEndToken)
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if (!scopeEndToken)
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@ -640,7 +656,8 @@ struct ForwardTraversal {
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} else if (Token::simpleMatch(tok->next(), "else {")) {
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} else if (Token::simpleMatch(tok->next(), "else {")) {
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tok = tok->linkAt(2);
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tok = tok->linkAt(2);
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}
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}
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} else if (tok->isControlFlowKeyword() && Token::Match(tok, "if|while|for (") && Token::simpleMatch(tok->next()->link(), ") {")) {
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} else if (tok->isControlFlowKeyword() && Token::Match(tok, "if|while|for (") &&
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Token::simpleMatch(tok->next()->link(), ") {")) {
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Token* endCond = tok->next()->link();
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Token* endCond = tok->next()->link();
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Token* endBlock = endCond->next()->link();
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Token* endBlock = endCond->next()->link();
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Token* condTok = getCondTok(tok);
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Token* condTok = getCondTok(tok);
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@ -105,6 +105,7 @@
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#include <array>
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#include <array>
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#include <cassert>
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#include <cassert>
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#include <climits>
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#include <climits>
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#include <cmath>
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#include <cstdlib>
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#include <cstdlib>
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#include <cstring>
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#include <cstring>
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#include <exception>
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#include <exception>
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@ -918,9 +919,9 @@ static void setTokenValue(Token* tok,
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const double floatValue1 = value1.isFloatValue() ? value1.floatValue : value1.intvalue;
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const double floatValue1 = value1.isFloatValue() ? value1.floatValue : value1.intvalue;
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const double floatValue2 = value2.isFloatValue() ? value2.floatValue : value2.intvalue;
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const double floatValue2 = value2.isFloatValue() ? value2.floatValue : value2.intvalue;
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const MathLib::bigint intValue1 =
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const MathLib::bigint intValue1 =
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value1.isFloatValue() ? static_cast<MathLib::bigint>(value1.floatValue) : value1.intvalue;
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value1.isFloatValue() ? std::llround(value1.floatValue) : value1.intvalue;
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const MathLib::bigint intValue2 =
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const MathLib::bigint intValue2 =
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value2.isFloatValue() ? static_cast<MathLib::bigint>(value2.floatValue) : value2.intvalue;
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value2.isFloatValue() ? std::llround(value2.floatValue) : value2.intvalue;
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if ((value1.isFloatValue() || value2.isFloatValue()) && Token::Match(parent, "&|^|%|<<|>>|==|!=|%or%"))
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if ((value1.isFloatValue() || value2.isFloatValue()) && Token::Match(parent, "&|^|%|<<|>>|==|!=|%or%"))
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continue;
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continue;
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if (Token::Match(parent, "==|!=")) {
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if (Token::Match(parent, "==|!=")) {
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@ -5444,7 +5445,10 @@ static void valueFlowAfterAssign(TokenList *tokenlist, SymbolDatabase* symboldat
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std::unordered_map<nonneg int, std::unordered_set<nonneg int>> backAssigns;
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std::unordered_map<nonneg int, std::unordered_set<nonneg int>> backAssigns;
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for (Token* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
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for (Token* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
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// Assignment
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// Assignment
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if ((tok->str() != "=" && !isVariableInit(tok)) || (tok->astParent()))
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if (tok->str() != "=" && !isVariableInit(tok))
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continue;
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if (tok->astParent() && !(tok->astParent()->str() == ";" && astIsLHS(tok)))
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continue;
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continue;
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// Lhs should be a variable
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// Lhs should be a variable
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@ -2380,7 +2380,8 @@ private:
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" some_condition ? 0 : a[i-1];\n"
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" some_condition ? 0 : a[i-1];\n"
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" }\n"
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" }\n"
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"}");
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"}");
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TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array index -1 is out of bounds.\n", "", errout.str());
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ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[10]' accessed at index -1, which is out of bounds.\n",
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errout.str());
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check("void f() {\n"
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check("void f() {\n"
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" int a[10];\n"
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" int a[10];\n"
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@ -2518,13 +2518,16 @@ private:
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" {\n"
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" {\n"
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" if (a) {\n"
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" if (a) {\n"
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" if (b)\n"
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" if (b)\n"
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" foo.erase(it);\n"
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" foo.erase(it);\n" // <- TODO: erase shound't cause inconclusive valueflow
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" else\n"
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" else\n"
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" *it = 0;\n"
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" *it = 0;\n"
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" }\n"
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" }\n"
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" }\n"
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" }\n"
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"}");
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"}");
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ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:7] -> [test.cpp:8] -> [test.cpp:8] -> [test.cpp:7] -> [test.cpp:5] -> [test.cpp:9] -> [test.cpp:3] -> [test.cpp:5]: (error) Using iterator to local container 'foo' that may be invalid.\n", errout.str());
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TODO_ASSERT_EQUALS(
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"[test.cpp:5] -> [test.cpp:7] -> [test.cpp:8] -> [test.cpp:8] -> [test.cpp:7] -> [test.cpp:5] -> [test.cpp:9] -> [test.cpp:3] -> [test.cpp:5]: (error) Using iterator to local container 'foo' that may be invalid.\n",
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"[test.cpp:5] -> [test.cpp:7] -> [test.cpp:8] -> [test.cpp:8] -> [test.cpp:7] -> [test.cpp:5] -> [test.cpp:9] -> [test.cpp:3] -> [test.cpp:5]: (error, inconclusive) Using iterator to local container 'foo' that may be invalid.\n",
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errout.str());
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}
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}
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void eraseGoto() {
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void eraseGoto() {
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@ -2603,6 +2603,23 @@ private:
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" }\n"
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" }\n"
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"};";
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"};";
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ASSERT_EQUALS(true, testValueOfX(code, 6U, 10));
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ASSERT_EQUALS(true, testValueOfX(code, 6U, 10));
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code = "void f(int i) {\n"
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" if (i == 3) {}\n"
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" for(int x = i;\n"
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" x;\n"
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" x++) {}\n"
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"}\n";
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ASSERT_EQUALS(true, testValueOfX(code, 4U, 3));
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ASSERT_EQUALS(false, testValueOfXKnown(code, 4U, 3));
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code = "void f() {\n"
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" for(int x = 3;\n"
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" x;\n"
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" x++) {}\n"
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"}\n";
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ASSERT_EQUALS(true, testValueOfX(code, 4U, 3));
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ASSERT_EQUALS(false, testValueOfXKnown(code, 4U, 3));
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}
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}
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void valueFlowAfterSwap()
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void valueFlowAfterSwap()
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@ -3920,7 +3937,10 @@ private:
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"void foo(struct S s) {\n"
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"void foo(struct S s) {\n"
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" for (s.x = 0; s.x < 127; s.x++) {}\n"
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" for (s.x = 0; s.x < 127; s.x++) {}\n"
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"}";
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"}";
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values = removeImpossible(tokenValues(code, "<")); // TODO: comparison can be true or false
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values = removeImpossible(tokenValues(code, "<"));
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values.remove_if([&](const ValueFlow::Value& v) {
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return !v.isKnown();
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});
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ASSERT_EQUALS(true, values.empty());
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ASSERT_EQUALS(true, values.empty());
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}
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}
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@ -4062,7 +4082,7 @@ private:
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" for (int x = 0; x < 10 && y = do_something();)\n"
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" for (int x = 0; x < 10 && y = do_something();)\n"
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" x;\n"
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" x;\n"
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"}";
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"}";
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TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 4U, 0));
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ASSERT_EQUALS(true, testValueOfX(code, 4U, 0));
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code = "void f() {\n"
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code = "void f() {\n"
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" int x,y;\n"
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" int x,y;\n"
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