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cppcheck/test/testastutils.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2021 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "astutils.h"
#include "settings.h"
#include "testsuite.h"
#include "token.h"
#include "tokenize.h"
#include "tokenlist.h"
#include <cstring>
class TestAstUtils : public TestFixture {
public:
TestAstUtils() : TestFixture("TestAstUtils") {
}
private:
void run() OVERRIDE {
TEST_CASE(findLambdaEndToken);
TEST_CASE(findLambdaStartToken);
TEST_CASE(isNullOperand);
TEST_CASE(isReturnScope);
TEST_CASE(isSameExpression);
TEST_CASE(isVariableChanged);
TEST_CASE(isVariableChangedByFunctionCall);
TEST_CASE(nextAfterAstRightmostLeaf);
TEST_CASE(isUsedAsBool);
}
bool findLambdaEndToken(const char code[]) {
Settings settings;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
const Token * const tokEnd = ::findLambdaEndToken(tokenizer.tokens());
return tokEnd && tokEnd->next() == nullptr;
}
void findLambdaEndToken() {
const Token* nullTok = nullptr;
ASSERT(nullptr == ::findLambdaEndToken(nullTok));
ASSERT_EQUALS(false, findLambdaEndToken("void f() { }"));
ASSERT_EQUALS(true, findLambdaEndToken("[]{ }"));
ASSERT_EQUALS(true, findLambdaEndToken("[]{ return 0; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](){ }"));
ASSERT_EQUALS(true, findLambdaEndToken("[&](){ }"));
ASSERT_EQUALS(true, findLambdaEndToken("[&, i](){ }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](void) { return -1; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](int a, int b) { return a + b; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](int a, int b) mutable { return a + b; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](int a, int b) constexpr { return a + b; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](void) -> int { return -1; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](void) mutable -> int { return -1; }"));
ASSERT_EQUALS(false, findLambdaEndToken("[](void) foo -> int { return -1; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](void) constexpr -> int { return -1; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](void) constexpr -> int* { return x; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](void) constexpr -> const * int { return x; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](void) mutable -> const * int { return x; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](void) constexpr -> const ** int { return x; }"));
ASSERT_EQUALS(true, findLambdaEndToken("[](void) constexpr -> const * const* int { return x; }"));
}
bool findLambdaStartToken(const char code[]) {
Settings settings;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
const Token * const tokStart = ::findLambdaStartToken(tokenizer.list.back());
return tokStart && tokStart == tokenizer.list.front();
}
void findLambdaStartToken() {
ASSERT(nullptr == ::findLambdaStartToken(nullptr));
ASSERT_EQUALS(false, findLambdaStartToken("void f() { }"));
ASSERT_EQUALS(true, findLambdaStartToken("[]{ }"));
ASSERT_EQUALS(true, findLambdaStartToken("[]{ return 0; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](){ }"));
ASSERT_EQUALS(true, findLambdaStartToken("[&](){ }"));
ASSERT_EQUALS(true, findLambdaStartToken("[&, i](){ }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](void) { return -1; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](int a, int b) { return a + b; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](int a, int b) mutable { return a + b; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](int a, int b) constexpr { return a + b; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](void) -> int { return -1; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](void) mutable -> int { return -1; }"));
ASSERT_EQUALS(false, findLambdaStartToken("[](void) foo -> int { return -1; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](void) constexpr -> int { return -1; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](void) constexpr -> int* { return x; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](void) constexpr -> const * int { return x; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](void) mutable -> const * int { return x; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](void) constexpr -> const ** int { return x; }"));
ASSERT_EQUALS(true, findLambdaStartToken("[](void) constexpr -> const * const* int { return x; }"));
}
bool isNullOperand(const char code[]) {
Settings settings;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
return ::isNullOperand(tokenizer.tokens());
}
void isNullOperand() {
ASSERT_EQUALS(true, isNullOperand("(void*)0;"));
ASSERT_EQUALS(true, isNullOperand("(void*)0U;"));
ASSERT_EQUALS(true, isNullOperand("(void*)0x0LL;"));
ASSERT_EQUALS(true, isNullOperand("NULL;"));
ASSERT_EQUALS(true, isNullOperand("nullptr;"));
ASSERT_EQUALS(true, isNullOperand("(void*)NULL;"));
ASSERT_EQUALS(true, isNullOperand("static_cast<int*>(0);"));
ASSERT_EQUALS(false, isNullOperand("0;"));
ASSERT_EQUALS(false, isNullOperand("(void*)0.0;"));
ASSERT_EQUALS(false, isNullOperand("(void*)1;"));
}
bool isReturnScope(const char code[], int offset) {
Settings settings;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
const Token * const tok = (offset < 0)
? tokenizer.list.back()->tokAt(1+offset)
: tokenizer.tokens()->tokAt(offset);
return ::isReturnScope(tok);
}
void isReturnScope() {
ASSERT_EQUALS(true, isReturnScope("void f() { if (a) { return; } }", -2));
ASSERT_EQUALS(true, isReturnScope("int f() { if (a) { return {}; } }", -2)); // #8891
ASSERT_EQUALS(true, isReturnScope("std::string f() { if (a) { return std::string{}; } }", -2)); // #8891
ASSERT_EQUALS(true, isReturnScope("std::string f() { if (a) { return std::string{\"\"}; } }", -2)); // #8891
ASSERT_EQUALS(true, isReturnScope("void f() { if (a) { return (ab){0}; } }", -2)); // #7103
ASSERT_EQUALS(false, isReturnScope("void f() { if (a) { return (ab){0}; } }", -4)); // #7103
ASSERT_EQUALS(true, isReturnScope("void f() { if (a) { {throw new string(x);}; } }", -4)); // #7144
ASSERT_EQUALS(true, isReturnScope("void f() { if (a) { {throw new string(x);}; } }", -2)); // #7144
ASSERT_EQUALS(false, isReturnScope("void f() { [=]() { return data; }; }", -1));
ASSERT_EQUALS(true, isReturnScope("auto f() { return [=]() { return data; }; }", -1));
ASSERT_EQUALS(true, isReturnScope("auto f() { return [=]() { return data; }(); }", -1));
ASSERT_EQUALS(false, isReturnScope("auto f() { [=]() { return data; }(); }", -1));
ASSERT_EQUALS(true, isReturnScope("void negativeTokenOffset() { return; }", -1));
ASSERT_EQUALS(false, isReturnScope("void zeroTokenOffset() { return; }", 0));
ASSERT_EQUALS(true, isReturnScope("void positiveTokenOffset() { return; }", 7));
}
bool isSameExpression(const char code[], const char tokStr1[], const char tokStr2[]) {
Settings settings;
Library library;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokens1("");
const Token * const tok1 = Token::findsimplematch(tokenizer.tokens(), tokStr1, strlen(tokStr1));
const Token * const tok2 = Token::findsimplematch(tok1->next(), tokStr2, strlen(tokStr2));
return ::isSameExpression(false, false, tok1, tok2, library, false, true, nullptr);
}
void isSameExpression() {
ASSERT_EQUALS(true, isSameExpression("x = 1 + 1;", "1", "1"));
ASSERT_EQUALS(false, isSameExpression("x = 1 + 1u;", "1", "1u"));
ASSERT_EQUALS(true, isSameExpression("x = 1.0 + 1.0;", "1.0", "1.0"));
ASSERT_EQUALS(false, isSameExpression("x = 1.0f + 1.0;", "1.0f", "1.0"));
ASSERT_EQUALS(false, isSameExpression("x = 1L + 1;", "1L", "1"));
ASSERT_EQUALS(true, isSameExpression("x = 0.0f + 0x0p+0f;", "0.0f", "0x0p+0f"));
ASSERT_EQUALS(true, isSameExpression("x < x;", "x", "x"));
ASSERT_EQUALS(false, isSameExpression("x < y;", "x", "y"));
ASSERT_EQUALS(true, isSameExpression("(x + 1) < (x + 1);", "+", "+"));
ASSERT_EQUALS(false, isSameExpression("(x + 1) < (x + 1L);", "+", "+"));
ASSERT_EQUALS(true, isSameExpression("(1 + x) < (x + 1);", "+", "+"));
ASSERT_EQUALS(false, isSameExpression("(1.0l + x) < (1.0 + x);", "+", "+"));
ASSERT_EQUALS(true, isSameExpression("(0.0 + x) < (x + 0x0p+0);", "+", "+"));
ASSERT_EQUALS(true, isSameExpression("void f() {double y = 1e1; (x + y) < (x + 10.0); } ", "+", "+"));
ASSERT_EQUALS(true, isSameExpression("void f() {double y = 1e1; (x + 10.0) < (y + x); } ", "+", "+"));
ASSERT_EQUALS(true, isSameExpression("void f() {double y = 1e1; double z = 10.0; (x + y) < (x + z); } ", "+", "+"));
ASSERT_EQUALS(true, isSameExpression("A + A", "A", "A"));
//https://trac.cppcheck.net/ticket/9700
ASSERT_EQUALS(true, isSameExpression("A::B + A::B;", "::", "::"));
ASSERT_EQUALS(false, isSameExpression("A::B + A::C;", "::", "::"));
ASSERT_EQUALS(true, isSameExpression("A::B* get() { if(x) return new A::B(true); else return new A::B(true); }", "new", "new"));
ASSERT_EQUALS(false, isSameExpression("A::B* get() { if(x) return new A::B(true); else return new A::C(true); }", "new", "new"));
ASSERT_EQUALS(true, true);
}
bool isVariableChanged(const char code[], const char startPattern[], const char endPattern[]) {
Settings settings;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
const Token * const tok1 = Token::findsimplematch(tokenizer.tokens(), startPattern, strlen(startPattern));
const Token * const tok2 = Token::findsimplematch(tokenizer.tokens(), endPattern, strlen(endPattern));
return ::isVariableChanged(tok1,tok2,1,false,&settings,true);
}
void isVariableChanged() {
// #8211 - no lhs for >> , do not crash
isVariableChanged("void f() {\n"
" int b;\n"
" if (b) { (int)((INTOF(8))result >> b); }\n"
"}", "if", "}");
// #9235
ASSERT_EQUALS(true, isVariableChanged("void f() {\n"
" int &a = a;\n"
"}\n", "= a", "}"));
}
bool isVariableChangedByFunctionCall(const char code[], const char pattern[], bool *inconclusive) {
Settings settings;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
const Token * const argtok = Token::findmatch(tokenizer.tokens(), pattern);
return ::isVariableChangedByFunctionCall(argtok, 0, &settings, inconclusive);
}
void isVariableChangedByFunctionCall() {
const char *code;
bool inconclusive;
// #8271 - template method
code = "void f(int x) {\n"
" a<int>(x);\n"
"}";
inconclusive = false;
ASSERT_EQUALS(false, isVariableChangedByFunctionCall(code, "x ) ;", &inconclusive));
ASSERT_EQUALS(true, inconclusive);
}
bool nextAfterAstRightmostLeaf(const char code[], const char parentPattern[], const char rightPattern[]) {
Settings settings;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
const Token * tok = Token::findsimplematch(tokenizer.tokens(), parentPattern, strlen(parentPattern));
return Token::simpleMatch(::nextAfterAstRightmostLeaf(tok), rightPattern, strlen(rightPattern));
}
void nextAfterAstRightmostLeaf() {
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("void f(int a, int b) { int x = a + b; }", "=", "; }"));
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("int * g(int); void f(int a, int b) { int x = g(a); }", "=", "; }"));
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("int * g(int); void f(int a, int b) { int x = g(a)[b]; }", "=", "; }"));
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("int * g(int); void f(int a, int b) { int x = g(g(a)[b]); }", "=", "; }"));
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("int * g(int); void f(int a, int b) { int x = g(g(a)[b] + a); }", "=", "; }"));
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("int * g(int); void f(int a, int b) { int x = g(a)[b + 1]; }", "=", "; }"));
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("void f() { int a; int b; int x = [](int a){}; }", "=", "; }"));
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("int * g(int); void f(int a, int b) { int x = a + b; }", "+", "; }"));
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("int * g(int); void f(int a, int b) { int x = g(a)[b + 1]; }", "+", "] ; }"));
ASSERT_EQUALS(true, nextAfterAstRightmostLeaf("int * g(int); void f(int a, int b) { int x = g(a + 1)[b]; }", "+", ") ["));
}
enum class Result {False, True, Fail};
Result isUsedAsBool(const char code[], const char pattern[]) {
Settings settings;
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
if (!tokenizer.tokenize(istr, "test.cpp"))
return Result::Fail;
const Token * const argtok = Token::findmatch(tokenizer.tokens(), pattern);
if (!argtok)
return Result::Fail;
return ::isUsedAsBool(argtok) ? Result::True : Result::False;
}
void isUsedAsBool() {
ASSERT(Result::True == isUsedAsBool("void f() { bool b = true; }", "b"));
ASSERT(Result::False ==isUsedAsBool("void f() { int i = true; }", "i"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if (i) {} }", "i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; while (i) {} }", "i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; for (;i;) {} }", "i ; )"));
ASSERT(Result::False == isUsedAsBool("void f() { int i; for (;;i) {} }", "i )"));
ASSERT(Result::False == isUsedAsBool("void f() { int i; for (i;;) {} }", "i ; ; )"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; for (int j=0; i; ++j) {} }", "i ; ++"));
ASSERT(Result::False == isUsedAsBool("void f() { int i; if (i == 2) {} }", "i =="));
ASSERT(Result::False == isUsedAsBool("void f() { int i; if (i == true) {} }", "i =="));
ASSERT(Result::False == isUsedAsBool("void f() { int i,j; if (i == (j&&f())) {} }", "i =="));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if (!i == 0) {} }", "i =="));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if (!i) {} }", "i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if (!!i) {} }", "i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if (i && f()) {} }", "i &&"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; int j = i && f(); }", "i &&"));
ASSERT(Result::False == isUsedAsBool("void f() { int i; if (i & f()) {} }", "i &"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if (static_cast<bool>(i)) {} }", "i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if ((bool)i) {} }", "i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if (1+static_cast<bool>(i)) {} }", "i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if (1+(bool)i) {} }", "i )"));
ASSERT(Result::False == isUsedAsBool("void f() { int i; if (1+static_cast<int>(i)) {} }", "i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; if (1+!static_cast<int>(i)) {} }", "i )"));
ASSERT(Result::False == isUsedAsBool("void f() { int i; if (1+(int)i) {} }", "i )"));
ASSERT(Result::False == isUsedAsBool("void f() { int i; if (i + 2) {} }", "i +"));
ASSERT(Result::True == isUsedAsBool("void f() { int i; bool b = i; }", "i ; }"));
ASSERT(Result::True == isUsedAsBool("void f(bool b); void f() { int i; f(i); }","i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int *i; if (*i) {} }", "i )"));
ASSERT(Result::True == isUsedAsBool("void f() { int *i; if (*i) {} }", "* i )"));
}
};
REGISTER_TEST(TestAstUtils)
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