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cppcheck/test/testexprengine.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2019 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 "exprengine.h"
#include "settings.h"
#include "symboldatabase.h"
#include "tokenize.h"
#include "testsuite.h"
#include <limits>
#include <string>
class TestExprEngine : public TestFixture {
public:
TestExprEngine() : TestFixture("TestExprEngine") {
}
private:
void run() OVERRIDE {
TEST_CASE(argPointer);
TEST_CASE(argSmartPointer);
TEST_CASE(argStruct);
TEST_CASE(expr1);
TEST_CASE(expr2);
TEST_CASE(expr3);
TEST_CASE(expr4);
TEST_CASE(expr5);
TEST_CASE(exprAssign1);
TEST_CASE(exprAssign2); // Truncation
TEST_CASE(if1);
TEST_CASE(if2);
TEST_CASE(if3);
TEST_CASE(if4);
TEST_CASE(if5);
TEST_CASE(ifelse1);
TEST_CASE(array1);
TEST_CASE(array2);
TEST_CASE(array3);
TEST_CASE(array4);
TEST_CASE(arrayInit1);
TEST_CASE(arrayInit2);
TEST_CASE(arrayUninit);
TEST_CASE(floatValue1);
TEST_CASE(floatValue2);
TEST_CASE(functionCall1);
TEST_CASE(functionCall2);
TEST_CASE(functionCall3);
TEST_CASE(pointer1);
TEST_CASE(pointer2);
TEST_CASE(pointerAlias1);
TEST_CASE(pointerAlias2);
TEST_CASE(pointerAlias3);
TEST_CASE(pointerAlias4);
TEST_CASE(pointerNull1);
}
std::string getRange(const char code[], const std::string &str, int linenr = 0) {
Settings settings;
settings.platform(cppcheck::Platform::Unix64);
settings.library.smartPointers.insert("std::shared_ptr");
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
std::string ret;
std::function<void(const Token *, const ExprEngine::Value &)> f = [&](const Token *tok, const ExprEngine::Value &value) {
if ((linenr == 0 || linenr == tok->linenr()) && tok->expressionString() == str) {
if (!ret.empty())
ret += ",";
ret += value.getRange();
}
};
std::vector<ExprEngine::Callback> callbacks;
callbacks.push_back(f);
std::ostringstream dummy;
ExprEngine::executeAllFunctions(&tokenizer, &settings, callbacks, dummy);
return ret;
}
std::string trackExecution(const char code[]) {
Settings settings;
settings.debugVerification = true;
settings.platform(cppcheck::Platform::Unix64);
settings.library.smartPointers.insert("std::shared_ptr");
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
std::vector<ExprEngine::Callback> dummy;
std::ostringstream ret;
ExprEngine::executeAllFunctions(&tokenizer, &settings, dummy, ret);
return ret.str();
}
void argPointer() {
ASSERT_EQUALS("->$1,null,->?", getRange("void f(unsigned char *p) { a = *p; }", "p"));
}
void argSmartPointer() {
ASSERT_EQUALS("->{x=$2},null", getRange("struct S { int x; }; void f(std::shared_ptr<S> ptr) { x = ptr; }", "ptr"));
}
void argStruct() {
ASSERT_EQUALS("0:510",
getRange("struct S {\n"
" unsigned char a;\n"
" unsigned char b;\n"
"};\n"
"void f(struct S s) { return s.a + s.b; }", "s.a+s.b"));
}
void expr1() {
ASSERT_EQUALS("-32768:32767", getRange("void f(short x) { a = x; }", "x"));
}
void expr2() {
ASSERT_EQUALS("-65536:65534", getRange("void f(short x) { a = x + x; }", "x+x"));
}
void expr3() {
ASSERT_EQUALS("-65536:65534", getRange("int f(short x) { int a = x + x; return a; }", "return a"));
}
void expr4() {
ASSERT_EQUALS("0", getRange("int f(short x) { int a = x - x; return a; }", "return a"));
}
void expr5() {
ASSERT_EQUALS("-65536:65534", getRange("void f(short a, short b, short c, short d) { if (a+b<c+d) {} }", "a+b"));
}
void exprAssign1() {
ASSERT_EQUALS("1:256", getRange("void f(unsigned char a) { a += 1; }", "a+=1"));
}
void exprAssign2() {
ASSERT_EQUALS("2", getRange("void f(unsigned char x) { x = 258; int a = x }", "a=x"));
}
void if1() {
ASSERT_EQUALS("7:32768", getRange("inf f(short x) { if (x > 5) a = x + 1; }", "x+1"));
}
void if2() {
ASSERT_EQUALS("7:32768,-32767:6", getRange("inf f(short x) { if (x > 5) {} a = x + 1; }", "x+1"));
}
void if3() {
ASSERT_EQUALS("1,-2147483648:2147483647,-2147483648:2147483647", getRange("void f() { int x; if (a) { if (b) x=1; } x=x; }", "x=x"));
}
void if4() {
ASSERT_EQUALS("1:2147483647,-2147483648:-1", getRange("int x; void f() { if (x) { a=x; }}", "a=x"));
}
void if5() {
ASSERT_EQUALS("0", getRange("int x; void f() { if (x) {} else { a=x; }}", "a=x"));
}
void ifelse1() {
ASSERT_EQUALS("-32767:6", getRange("inf f(short x) { if (x > 5) ; else a = x + 1; }", "x+1"));
}
void array1() {
ASSERT_EQUALS("5", getRange("inf f() { int arr[10]; arr[4] = 5; return arr[4]; }", "arr[4]"));
}
void array2() {
ASSERT_EQUALS("0:255", getRange("void dostuff(unsigned char *); int f() { unsigned char arr[10] = \"\"; dostuff(arr); return arr[4]; }", "arr[4]"));
}
void array3() {
ASSERT_EQUALS("?,43", getRange("int f(unsigned char x) { int arr[10]; arr[4] = 43; int vx = arr[x]; }", "arr[x]"));
}
void array4() {
const char code[] = "int buf[10];\n"
"void f() { int x = buf[0]; }";
ASSERT_EQUALS("2:16: $2:0=-2147483648:2147483647\n"
"2:20: $2=-2147483648:2147483647\n"
"2:26: { buf=($1,size=10,[:]=$2) x=$2:0}\n",
trackExecution(code));
}
void arrayInit1() {
ASSERT_EQUALS("0", getRange("inf f() { char arr[10] = \"\"; return arr[4]; }", "arr[4]"));
}
void arrayInit2() {
ASSERT_EQUALS("66", getRange("void f() { char str[] = \"hello\"; str[0] = \'B\'; }", "str[0]=\'B\'"));
}
void arrayUninit() {
ASSERT_EQUALS("?", getRange("int f() { int arr[10]; return arr[4]; }", "arr[4]"));
}
void floatValue1() {
ASSERT_EQUALS(std::to_string(std::numeric_limits<float>::min()) + ":" + std::to_string(std::numeric_limits<float>::max()), getRange("float f; void func() { f=f; }", "f=f"));
}
void floatValue2() {
ASSERT_EQUALS("14.500000", getRange("void func() { float f = 29.0; f = f / 2.0; }", "f/2.0"));
}
void functionCall1() {
ASSERT_EQUALS("-2147483648:2147483647", getRange("int atoi(const char *p); void f() { int x = atoi(a); x = x; }", "x=x"));
}
void functionCall2() {
const char code[] = "namespace NS {\n"
" short getValue();\n"
"}"
"void f() {\n"
" short value = NS::getValue();\n"
" value = value;\n"
"}";
ASSERT_EQUALS("-32768:32767", getRange(code, "value=value"));
}
void functionCall3() {
ASSERT_EQUALS("-2147483648:2147483647", getRange("int fgets(int, const char *, void *); void f() { int x = -1; fgets(stdin, \"%d\", &x); x=x; }", "x=x"));
}
void pointer1() {
ASSERT_EQUALS("?", getRange("int f() { int *x; x = x; }", "x=x"));
}
void pointer2() {
ASSERT_EQUALS("?", getRange("int f() { sometype *x; x = x; }", "x=x"));
}
void pointerAlias1() {
ASSERT_EQUALS("3", getRange("int f() { int x; int *p = &x; x = 3; return *p; }", "return*p"));
}
void pointerAlias2() {
ASSERT_EQUALS("1", getRange("int f() { int x; int *p = &x; *p = 1; return *p; }", "return*p"));
}
void pointerAlias3() {
ASSERT_EQUALS("7", getRange("int f() {\n"
" int x = 18;\n"
" int *p = &x;\n"
" *p = 7;\n"
" return x;\n"
"}", "x", 5));
}
void pointerAlias4() {
ASSERT_EQUALS("71", getRange("int f() { int x[10]; int *p = x+3; *p = 71; return x[3]; }", "x[3]"));
}
void pointerNull1() {
ASSERT_EQUALS("0", getRange("void f(void *p) { p = NULL; p += 1; }", "p+=1"));
}
};
REGISTER_TEST(TestExprEngine)
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