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cppcheck/test/testvalueflow.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2016 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 "library.h"
#include "platform.h"
#include "settings.h"
#include "testsuite.h"
#include "token.h"
#include "tokenize.h"
#include "valueflow.h"
#include <simplecpp.h>
#include <cmath>
#include <list>
#include <map>
#include <ostream>
#include <string>
#include <utility>
#include <vector>
class TestValueFlow : public TestFixture {
public:
TestValueFlow() : TestFixture("TestValueFlow") {
}
private:
Settings settings;
void run() {
// strcpy cfg
const char cfg[] = "<?xml version=\"1.0\"?>\n"
"<def>\n"
" <function name=\"strcpy\"> <arg nr=\"1\"><not-null/></arg> </function>\n"
"</def>";
settings.library.loadxmldata(cfg, sizeof(cfg));
TEST_CASE(valueFlowNumber);
TEST_CASE(valueFlowString);
TEST_CASE(valueFlowPointerAlias);
TEST_CASE(valueFlowArrayElement);
TEST_CASE(valueFlowMove);
TEST_CASE(valueFlowBitAnd);
TEST_CASE(valueFlowCalculations);
TEST_CASE(valueFlowErrorPath);
TEST_CASE(valueFlowBeforeCondition);
TEST_CASE(valueFlowBeforeConditionAndAndOrOrGuard);
TEST_CASE(valueFlowBeforeConditionAssignIncDec);
TEST_CASE(valueFlowBeforeConditionFunctionCall);
TEST_CASE(valueFlowBeforeConditionGlobalVariables);
TEST_CASE(valueFlowBeforeConditionGoto);
TEST_CASE(valueFlowBeforeConditionIfElse);
TEST_CASE(valueFlowBeforeConditionLoop);
TEST_CASE(valueFlowBeforeConditionMacro);
TEST_CASE(valueFlowBeforeConditionSizeof);
TEST_CASE(valueFlowBeforeConditionSwitch);
TEST_CASE(valueFlowBeforeConditionTernaryOp);
TEST_CASE(valueFlowAfterAssign);
TEST_CASE(valueFlowAfterCondition);
TEST_CASE(valueFlowForwardCompoundAssign);
TEST_CASE(valueFlowForwardCorrelatedVariables);
TEST_CASE(valueFlowForwardFunction);
TEST_CASE(valueFlowForwardLambda);
TEST_CASE(valueFlowSwitchVariable);
TEST_CASE(valueFlowForLoop);
TEST_CASE(valueFlowSubFunction);
TEST_CASE(valueFlowFunctionReturn);
TEST_CASE(valueFlowFunctionDefaultParameter);
TEST_CASE(knownValue);
TEST_CASE(valueFlowSizeofForwardDeclaredEnum);
TEST_CASE(valueFlowGlobalVar);
TEST_CASE(valueFlowGlobalStaticVar);
TEST_CASE(valueFlowInlineAssembly);
TEST_CASE(valueFlowUninit);
}
bool testValueOfX(const char code[], unsigned int linenr, int value) {
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
if (tok->str() == "x" && tok->linenr() == linenr) {
std::list<ValueFlow::Value>::const_iterator it;
for (it = tok->values().begin(); it != tok->values().end(); ++it) {
if (it->isIntValue() && it->intvalue == value)
return true;
}
}
}
return false;
}
bool testValueOfX(const char code[], unsigned int linenr, float value, float diff) {
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
if (tok->str() == "x" && tok->linenr() == linenr) {
std::list<ValueFlow::Value>::const_iterator it;
for (it = tok->values().begin(); it != tok->values().end(); ++it) {
if (it->isFloatValue() && it->floatValue >= value - diff && it->floatValue <= value + diff)
return true;
}
}
}
return false;
}
std::string getErrorPathForX(const char code[], unsigned int linenr) {
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
if (tok->str() != "x" || tok->linenr() != linenr)
continue;
std::ostringstream ostr;
std::list<ValueFlow::Value>::const_iterator it;
for (it = tok->values().begin(); it != tok->values().end(); ++it) {
for (ValueFlow::Value::ErrorPath::const_iterator ep = it->errorPath.begin(); ep != it->errorPath.end(); ++ep) {
const Token *eptok = ep->first;
const std::string &msg = ep->second;
ostr << eptok->linenr() << ',' << msg << '\n';
}
}
return ostr.str();
}
return "";
}
bool testValueOfX(const char code[], unsigned int linenr, const char value[]) {
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
if (tok->str() == "x" && tok->linenr() == linenr) {
std::list<ValueFlow::Value>::const_iterator it;
for (it = tok->values().begin(); it != tok->values().end(); ++it) {
if (it->isTokValue() && Token::simpleMatch(it->tokvalue, value))
return true;
}
}
}
return false;
}
bool testValueOfX(const char code[], unsigned int linenr, ValueFlow::Value::MoveKind moveKind) {
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
if (tok->str() == "x" && tok->linenr() == linenr) {
std::list<ValueFlow::Value>::const_iterator it;
for (it = tok->values().begin(); it != tok->values().end(); ++it) {
if (it->isMovedValue() && it->moveKind == moveKind)
return true;
}
}
}
return false;
}
bool testConditionalValueOfX(const char code[], unsigned int linenr, int value) {
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
if (tok->str() == "x" && tok->linenr() == linenr) {
std::list<ValueFlow::Value>::const_iterator it;
for (it = tok->values().begin(); it != tok->values().end(); ++it) {
if (it->isIntValue() && it->intvalue == value && it->condition)
return true;
}
}
}
return false;
}
void bailout(const char code[]) {
settings.debugwarnings = true;
errout.str("");
std::vector<std::string> files;
files.push_back("test.cpp");
std::istringstream istr(code);
const simplecpp::TokenList tokens1(istr, files, files[0]);
simplecpp::TokenList tokens2(files);
std::map<std::string, simplecpp::TokenList*> filedata;
simplecpp::preprocess(tokens2, tokens1, files, filedata, simplecpp::DUI());
// Tokenize..
Tokenizer tokenizer(&settings, this);
tokenizer.createTokens(&tokens2);
tokenizer.simplifyTokens1("");
settings.debugwarnings = false;
}
std::list<ValueFlow::Value> tokenValues(const char code[], const char tokstr[]) {
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
errout.str("");
tokenizer.tokenize(istr, "test.cpp");
const Token *tok = Token::findmatch(tokenizer.tokens(), tokstr);
return tok ? tok->values() : std::list<ValueFlow::Value>();
}
ValueFlow::Value valueOfTok(const char code[], const char tokstr[]) {
std::list<ValueFlow::Value> values = tokenValues(code, tokstr);
return values.size() == 1U && !values.front().isTokValue() ? values.front() : ValueFlow::Value();
}
void valueFlowNumber() {
ASSERT_EQUALS(123, valueOfTok("x=123;", "123").intvalue);
ASSERT(std::fabs(valueOfTok("x=0.5;", "0.5").floatValue - 0.5f) < 0.1f);
ASSERT_EQUALS(10, valueOfTok("enum {A=10,B=15}; x=A+0;", "+").intvalue);
ASSERT_EQUALS(0, valueOfTok("x=false;", "false").intvalue);
ASSERT_EQUALS(1, valueOfTok("x=true;", "true").intvalue);
ASSERT_EQUALS(0, valueOfTok("x(NULL);", "NULL").intvalue);
ASSERT_EQUALS((int)('a'), valueOfTok("x='a';", "'a'").intvalue);
ASSERT_EQUALS((int)('\n'), valueOfTok("x='\\n';", "'\\n'").intvalue);
ASSERT_EQUALS(0xFFFFFFFF00000000, valueOfTok("x=0xFFFFFFFF00000000;","18446744069414584320U").intvalue); // #7701
}
void valueFlowString() {
const char *code;
// valueFlowAfterAssign
code = "const char * f() {\n"
" static const char *x;\n"
" if (a) x = \"123\";\n"
" return x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4, "\"123\""));
// valueFlowSubFunction
code = "void dostuff(const char *x) {\n"
" f(x);\n"
"}\n"
"\n"
"void test() { dostuff(\"abc\"); }";
ASSERT_EQUALS(true, testValueOfX(code, 2, "\"abc\""));
}
void valueFlowPointerAlias() {
const char *code;
code = "const char * f() {\n"
" static const char *x;\n"
" static char ret[10];\n"
" if (a) x = &ret[0];\n"
" return x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 5, "& ret [ 0 ]"));
// dead pointer
code = "void f() {\n"
" int *x;\n"
" if (cond) { int i; x = &i; }\n"
" *x = 0;\n" // <- x can point at i
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4, "& i"));
code = "void f() {\n"
" struct X *x;\n"
" x = &x[1];\n"
"}";
ASSERT_EQUALS(true, tokenValues(code, "&").empty());
ASSERT_EQUALS(true, tokenValues(code, "x [").empty());
}
void valueFlowArrayElement() {
const char *code;
code = "void f() {\n"
" const int x[] = {43,23,12};\n"
" return x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, "{ 43 , 23 , 12 }"));
code = "void f() {\n"
" const char x[] = \"abcd\";\n"
" return x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, "\"abcd\""));
code = "void f() {\n"
" char x[32] = \"abcd\";\n"
" return x;\n"
"}";
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 3U, "\"abcd\""));
code = "void f() {\n"
" int a[10];\n"
" int *x = a;\n" // <- a value is a
" *x = 0;\n" // .. => x value is a
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4, "a"));
code = "char f() {\n"
" const char *x = \"abcd\";\n"
" return x[0];\n"
"}";
ASSERT_EQUALS((int)('a'), valueOfTok(code, "[").intvalue);
code = "char f() {\n"
" const char *x = \"\";\n"
" return x[0];\n"
"}";
ASSERT_EQUALS(0, valueOfTok(code, "[").intvalue);
}
void valueFlowMove() {
const char *code;
code = "void f() {\n"
" X x;\n"
" g(std::move(x));\n"
" y=x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, ValueFlow::Value::MovedVariable));
code = "void f() {\n"
" X x;\n"
" g(std::forward<X>(x));\n"
" y=x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, ValueFlow::Value::ForwardedVariable));
code = "void f() {\n"
" X x;\n"
" g(std::move(x).getA());\n" // Only parts of x might be moved out
" y=x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, ValueFlow::Value::MovedVariable));
code = "void f() {\n"
" X x;\n"
" g(std::forward<X>(x).getA());\n" // Only parts of x might be moved out
" y=x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, ValueFlow::Value::ForwardedVariable));
code = "void f() {\n"
" X x;\n"
" g(std::move(x));\n"
" x.clear();\n"
" y=x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, ValueFlow::Value::MovedVariable));
code = "void f() {\n"
" X x;\n"
" g(std::move(x));\n"
" y=x->y;\n"
" z=x->z;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 5U, ValueFlow::Value::MovedVariable));
code = "void f(int i) {\n"
" X x;\n"
" z = g(std::move(x));\n"
" y = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, ValueFlow::Value::MovedVariable));
code = "void f(int i) {\n"
" X x;\n"
" y = g(std::move(x), \n"
" x.size());\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, ValueFlow::Value::MovedVariable));
code = "void f(int i) {\n"
" X x;\n"
" x = g(std::move(x));\n"
" y = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, ValueFlow::Value::MovedVariable));
code = "A f(int i) {\n"
" X x;\n"
" if (i)"
" return g(std::move(x));\n"
" return h(std::move(x));\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, ValueFlow::Value::MovedVariable));
}
void valueFlowCalculations() {
const char *code;
// Different operators
ASSERT_EQUALS(5, valueOfTok("3 + (a ? b : 2);", "+").intvalue);
ASSERT_EQUALS(1, valueOfTok("3 - (a ? b : 2);", "-").intvalue);
ASSERT_EQUALS(6, valueOfTok("3 * (a ? b : 2);", "*").intvalue);
ASSERT_EQUALS(6, valueOfTok("13 / (a ? b : 2);", "/").intvalue);
ASSERT_EQUALS(1, valueOfTok("13 % (a ? b : 2);", "%").intvalue);
ASSERT_EQUALS(0, valueOfTok("3 == (a ? b : 2);", "==").intvalue);
ASSERT_EQUALS(1, valueOfTok("3 != (a ? b : 2);", "!=").intvalue);
ASSERT_EQUALS(1, valueOfTok("3 > (a ? b : 2);", ">").intvalue);
ASSERT_EQUALS(1, valueOfTok("3 >= (a ? b : 2);", ">=").intvalue);
ASSERT_EQUALS(0, valueOfTok("3 < (a ? b : 2);", "<").intvalue);
ASSERT_EQUALS(0, valueOfTok("3 <= (a ? b : 2);", "<=").intvalue);
ASSERT_EQUALS(1, valueOfTok("(UNKNOWN_TYPE)1;","(").intvalue);
ASSERT(tokenValues("(UNKNOWN_TYPE)1000;","(").empty()); // don't know if there is truncation, sign extension
ASSERT_EQUALS(255, valueOfTok("(unsigned char)~0;", "(").intvalue);
ASSERT_EQUALS(0, valueOfTok("(int)0;", "(").intvalue);
ASSERT_EQUALS(3, valueOfTok("(int)(1+2);", "(").intvalue);
ASSERT_EQUALS(0, valueOfTok("(UNKNOWN_TYPE*)0;","(").intvalue);
ASSERT_EQUALS(100, valueOfTok("(int)100.0;", "(").intvalue);
// Don't calculate if there is UB
ASSERT(tokenValues(";-1<<10;","<<").empty());
ASSERT(tokenValues(";10<<-1;","<<").empty());
ASSERT(tokenValues(";10<<64;","<<").empty());
ASSERT(tokenValues(";-1>>10;",">>").empty());
ASSERT(tokenValues(";10>>-1;",">>").empty());
ASSERT(tokenValues(";10>>64;",">>").empty());
// calculation using 1,2 variables/values
code = "void f(int x) {\n"
" a = x+456;\n"
" if (x==123) {}"
"}";
ASSERT_EQUALS(579, valueOfTok(code, "+").intvalue);
code = "void f(int x, int y) {\n"
" a = x+y;\n"
" if (x==123 || y==456) {}"
"}";
ASSERT_EQUALS(0, valueOfTok(code, "+").intvalue);
code = "void f(int x) {\n"
" a = x+x;\n"
" if (x==123) {}"
"}";
ASSERT_EQUALS(246, valueOfTok(code, "+").intvalue);
code = "void f(int x, int y) {\n"
" a = x*x;\n"
" if (x==2) {}\n"
" if (x==4) {}\n"
"}";
std::list<ValueFlow::Value> values = tokenValues(code,"*");
ASSERT_EQUALS(2U, values.size());
ASSERT_EQUALS(4, values.front().intvalue);
ASSERT_EQUALS(16, values.back().intvalue);
code = "void f(int x) {\n"
" if (x == 3) {}\n"
" a = x * (1 - x - 1);\n"
"}";
ASSERT_EQUALS(-9, valueOfTok(code, "*").intvalue);
// addition of different variables with known values
code = "int f(int x) {\n"
" int a = 1;\n"
" while (x!=3) { x+=a; }\n"
" return x/a;\n"
"}\n";
ASSERT_EQUALS(3, valueOfTok(code, "/").intvalue);
// ? :
code = "x = y ? 2 : 3;\n";
values = tokenValues(code,"?");
ASSERT_EQUALS(2U, values.size());
ASSERT_EQUALS(2, values.front().intvalue);
ASSERT_EQUALS(3, values.back().intvalue);
code = "void f(int a) { x = a ? 2 : 3; }\n";
values = tokenValues(code,"?");
ASSERT_EQUALS(2U, values.size());
ASSERT_EQUALS(2, values.front().intvalue);
ASSERT_EQUALS(3, values.back().intvalue);
code = "x = (2<5) ? 2 : 3;\n";
values = tokenValues(code, "?");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(2, values.front().intvalue);
code = "x = 123 ? : 456;\n";
values = tokenValues(code, "?");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(123, values.empty() ? 0 : values.front().intvalue);
// ~
code = "x = ~0U;";
settings.platform(cppcheck::Platform::Native); // ensure platform is native
values = tokenValues(code,"~");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(~0U, values.back().intvalue);
// !
code = "void f(int x) {\n"
" a = !x;\n"
" if (x==0) {}\n"
"}";
values = tokenValues(code,"!");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(1, values.back().intvalue);
// unary minus
code = "void f(int x) {\n"
" a = -x;\n"
" if (x==10) {}\n"
"}";
values = tokenValues(code,"-");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(-10, values.back().intvalue);
// sizeof
code = "void f() {\n"
" x = sizeof(int);\n"
"}";
values = tokenValues(code,"( int )");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(settings.sizeof_int, values.back().intvalue);
code = "void f() {\n"
" struct S *a[10];"
" x = sizeof(a) / sizeof(a[0]);\n"
"}";
values = tokenValues(code,"/");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(10, values.back().intvalue);
// function call => calculation
code = "void f(int x) {\n"
" a = x + 8;\n"
"}\n"
"void callf() {\n"
" f(7);\n"
"}";
ASSERT_EQUALS(15, valueOfTok(code, "+").intvalue);
code = "void f(int x, int y) {\n"
" a = x + y;\n"
"}\n"
"void callf() {\n"
" f(1,1);\n"
" f(10,10);\n"
"}";
values = tokenValues(code, "+");
ASSERT_EQUALS(true, values.empty());
if (!values.empty()) {
/* todo.. */
ASSERT_EQUALS(2U, values.size());
ASSERT_EQUALS(2, values.front().intvalue);
ASSERT_EQUALS(22, values.back().intvalue);
}
// Comparison of string
values = tokenValues("f(\"xyz\" == \"xyz\");", "=="); // implementation defined
ASSERT_EQUALS(0U, values.size()); // <- no value
values = tokenValues("f(\"xyz\" == 0);", "==");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(0, values.front().intvalue);
values = tokenValues("f(0 == \"xyz\");", "==");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(0, values.front().intvalue);
values = tokenValues("f(\"xyz\" != 0);", "!=");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(1, values.front().intvalue);
values = tokenValues("f(0 != \"xyz\");", "!=");
ASSERT_EQUALS(1U, values.size());
ASSERT_EQUALS(1, values.front().intvalue);
}
void valueFlowErrorPath() {
const char *code;
code = "void f() {\n"
" int x = 53;\n"
" a = x;\n"
"}\n";
ASSERT_EQUALS("2,Assignment 'x=53', assigned value is 53\n",
getErrorPathForX(code, 3U));
code = "void f(int y) {\n"
" int x = y;\n"
" a = x;\n"
" y += 12;\n"
" if (y == 32) {}"
"}\n";
ASSERT_EQUALS("5,Assuming that condition 'y==32' is not redundant\n"
"4,Compound assignment '+=', before assignment value is 20\n"
"2,Assignment 'x=y', assigned value is 20\n",
getErrorPathForX(code, 3U));
code = "void f1(int x) {\n"
" a = x;\n"
"}\n"
"void f2() {\n"
" int x = 3;\n"
" f1(x+1);\n"
"}\n";
ASSERT_EQUALS("5,Assignment 'x=3', assigned value is 3\n"
"6,Calling function 'f1', 1st argument 'x' value is 4\n",
getErrorPathForX(code, 2U));
code = "void f(int a) {\n"
" int x;\n"
" for (x = a; x < 50; x++) {}\n"
" b = x;\n"
"}\n";
ASSERT_EQUALS("3,After for loop, x has value 50\n",
getErrorPathForX(code, 4U));
}
void valueFlowBeforeCondition() {
const char *code;
code = "void f(int x) {\n"
" int a = x;\n"
" if (x == 123) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 123));
code = "void f(unsigned int x) {\n"
" int a = x;\n"
" if (x >= 1) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 1));
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
code = "void f(unsigned int x) {\n"
" int a = x;\n"
" if (x > 0) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
code = "void f(unsigned int x) {\n"
" int a = x;\n"
" if (x > 1) {}\n" // not zero => don't consider > condition
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 1));
code = "void f(int x) {\n" // not unsigned => don't consider > condition
" int a = x;\n"
" if (x > 0) {}\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
code = "void f(int *x) {\n"
" *x = 100;\n"
" if (x) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
code = "extern const int x;\n"
"void f() {\n"
" int a = x;\n"
" if (x == 123) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
}
void valueFlowBeforeConditionAssignIncDec() { // assignment / increment
const char *code;
code = "void f(int x) {\n"
" x = 2 + x;\n"
" if (x == 65);\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 65));
code = "void f(int x) {\n"
" x = y = 2 + x;\n"
" if (x == 65);\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 65));
code = "void f(int x) {\n"
" a[x++] = 0;\n"
" if (x == 5);\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 5));
code = "void f(int x) {\n"
" a = x;\n"
" x++;\n"
" if (x == 4);\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 3));
ASSERT_EQUALS("4,Assuming that condition 'x==4' is not redundant\n"
"3,x is incremented, before this increment the value is 3\n",
getErrorPathForX(code, 2U));
// compound assignment += , -= , ...
code = "void f(int x) {\n"
" a = x;\n"
" x += 2;\n"
" if (x == 4);\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 2));
code = "void f(int x) {\n"
" a = x;\n"
" x -= 2;\n"
" if (x == 4);\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 6));
code = "void f(int x) {\n"
" a = x;\n"
" x *= 2;\n"
" if (x == 42);\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 21));
code = "void f(int x) {\n"
" a = x;\n"
" x /= 5;\n"
" if (x == 42);\n"
"}";
ASSERT(tokenValues(code, "x ;").empty());
// bailout: assignment
bailout("void f(int x) {\n"
" x = y;\n"
" if (x == 123) {}\n"
"}");
ASSERT_EQUALS_WITHOUT_LINENUMBERS("[test.cpp:2]: (debug) valueflow.cpp:1035:valueFlowReverse bailout: assignment of x\n", errout.str());
}
void valueFlowBeforeConditionAndAndOrOrGuard() { // guarding by &&
const char *code;
code = "void f(int x) {\n"
" if (!x || \n" // <- x can be 0
" a/x) {}\n" // <- x can't be 0
" if (x==0) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
code = "void f(int *x) {\n"
" ((x=ret())&&\n"
" (*x==0));\n" // <- x is not 0
" if (x==0) {}\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
code = "void f(int *x) {\n"
" int a = (x && *x == '1');\n"
" int b = a ? atoi(x) : 0;\n" // <- x is not 0
" if (x==0) {}\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
}
void valueFlowBeforeConditionFunctionCall() { // function calls
const char *code;
code = "void f(int x) {\n"
" a = x;\n"
" setx(x);\n"
" if (x == 1) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX((std::string("void setx(int x);")+code).c_str(), 2U, 1));
ASSERT_EQUALS(false, testValueOfX((std::string("void setx(int &x);")+code).c_str(), 2U, 1));
ASSERT_EQUALS(true, testValueOfX(code, 2U, 1));
code = "void f(char* x) {\n"
" strcpy(x,\"abc\");\n"
" if (x) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
code = "void addNewFunction(Scope**scope, const Token**tok);\n"
"void f(Scope *x) {\n"
" x->functionList.back();\n"
" addNewFunction(&x,&tok);\n" // address-of, x can be changed by subfunction
" if (x) {}\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
}
void valueFlowBeforeConditionLoop() { // while, for, do-while
const char *code;
code = "void f(int x) {\n" // loop condition, x is not assigned inside loop => use condition
" a = x;\n" // x can be 37
" while (x == 37) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 37));
code = "void f(int x) {\n" // loop condition, x is assigned inside loop => don't use condition
" a = x;\n" // don't assume that x can be 37
" while (x != 37) { x++; }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 37));
code = "void f(int x) {\n"
" a = x;\n"
" for (; x!=1; x++) { }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 1));
code = "void f(menu *x) {\n"
" a = x->parent;\n"
" for (i=0;(i<10) && (x!=0); i++) { x = x->next; }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
code = "void f(int x) {\n" // condition inside loop, x is NOT assigned inside loop => use condition
" a = x;\n"
" do {\n"
" if (x==76) {}\n"
" } while (1);\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 76));
code = "void f(int x) {\n" // conditions inside loop, x is assigned inside do-while => don't use condition
" a = x;\n"
" do {\n"
" if (x!=76) { x=do_something(); }\n"
" } while (1);\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 76));
code = "void f(X x) {\n" // conditions inside loop, x is assigned inside do-while => don't use condition
" a = x;\n"
" for (i=1;i<=count;i++) {\n"
" BUGON(x==0)\n"
" x = x.next;\n"
" }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
}
void valueFlowBeforeConditionTernaryOp() { // bailout: ?:
const char *code;
bailout("void f(int x) {\n"
" y = ((x<0) ? x : ((x==2)?3:4));\n"
"}");
ASSERT_EQUALS_WITHOUT_LINENUMBERS("[test.cpp:2]: (debug) valueflow.cpp:1113:valueFlowReverse bailout: no simplification of x within ?: expression\n", errout.str());
bailout("int f(int x) {\n"
" int r = x ? 1 / x : 0;\n"
" if (x == 0) {}\n"
"}");
ASSERT_EQUALS_WITHOUT_LINENUMBERS("[test.cpp:2]: (debug) valueflow.cpp:1113:valueFlowReverse bailout: no simplification of x within ?: expression\n", errout.str());
code = "void f(int x) {\n"
" int a =v x;\n"
" a = b ? x/2 : 20/x;\n"
" if (x == 123) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 123));
code = "void f(const s *x) {\n"
" x->a = 0;\n"
" if (x ? x->a : 0) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
code = "void f(int x, int y) {\n"
" a = x;\n"
" if (y){}\n"
" if (x==123){}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 123));
}
void valueFlowBeforeConditionSizeof() { // skip sizeof
const char *code;
code = "void f(int *x) {\n"
" sizeof(x[0]);\n"
" if (x==63){}\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 63));
code = "void f(int *x) {\n"
" char a[sizeof x.y];\n"
" if (x==0){}\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
}
void valueFlowBeforeConditionIfElse() { // bailout: if/else/etc
const char *code;
code = "void f(X * x) {\n"
" a = x;\n"
" if ((x != NULL) &&\n"
" (a(x->name, html)) &&\n"
" (a(x->name, body))) {}\n"
" if (x != NULL) { }\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 5U, 0));
bailout("void f(int x) {\n"
" if (x != 123) { b = x; }\n"
" if (x == 123) {}\n"
"}");
ASSERT_EQUALS_WITHOUT_LINENUMBERS("[test.cpp:2]: (debug) valueflow.cpp:1144:valueFlowReverse bailout: variable x stopping on }\n", errout.str());
code = "void f(int x) {\n"
" a = x;\n"
" if (abc) { x = 1; }\n" // <- condition must be false if x is 7 in next line
" if (x == 7) { }\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 7));
}
void valueFlowBeforeConditionGlobalVariables() {
const char *code;
// handle global variables
code = "int x;\n"
"void f() {\n"
" int a = x;\n"
" if (x == 123) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code,3,123));
// bailout when there is function call
code = "class Fred { int x; void clear(); void f(); };\n"
"void Fred::f() {\n"
" int a = x;\n"
" clear();\n" // <- x might be assigned
" if (x == 234) {}\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code,3,234));
}
void valueFlowBeforeConditionSwitch() {
// bailout: switch
// TODO : handle switch/goto more intelligently
bailout("void f(int x, int y) {\n"
" switch (y) {\n"
" case 1: a=x; break;\n"
" case 2: if (x==5) {} break;\n"
" };\n"
"}");
ASSERT_EQUALS_WITHOUT_LINENUMBERS("[test.cpp:3]: (debug) valueflow.cpp:1180:valueFlowReverse bailout: variable x stopping on break\n", errout.str());
bailout("void f(int x, int y) {\n"
" switch (y) {\n"
" case 1: a=x; return 1;\n"
" case 2: if (x==5) {} break;\n"
" };\n"
"}");
ASSERT_EQUALS_WITHOUT_LINENUMBERS("[test.cpp:3]: (debug) valueflow.cpp:1180:valueFlowReverse bailout: variable x stopping on return\n", errout.str());
}
void valueFlowBeforeConditionMacro() {
// bailout: condition is a expanded macro
bailout("#define M if (x==123) {}\n"
"void f(int x) {\n"
" a = x;\n"
" M;\n"
"}");
ASSERT_EQUALS_WITHOUT_LINENUMBERS("[test.cpp:4]: (debug) valueflow.cpp:1260:valueFlowBeforeCondition bailout: variable x, condition is defined in macro\n", errout.str());
}
void valueFlowBeforeConditionGoto() {
// bailout: goto label (TODO: handle gotos more intelligently)
bailout("void f(int x) {\n"
" if (x == 123) { goto out; }\n"
" a=x;\n" // <- x is not 123
"out:"
" if (x==123){}\n"
"}");
ASSERT_EQUALS_WITHOUT_LINENUMBERS("[test.cpp:4]: (debug) valueflow.cpp:1131:valueFlowReverse bailout: variable x stopping on goto label\n"
"[test.cpp:2]: (debug) valueflow.cpp:1813:valueFlowForward bailout: variable x. noreturn conditional scope.\n"
, errout.str());
// #5721 - FP
bailout("static void f(int rc) {\n"
" ABC* abc = getabc();\n"
" if (!abc) { goto out };\n"
"\n"
" abc->majortype = 0;\n"
" if (FAILED(rc)) {}\n"
"\n"
"out:\n"
" if (abc) {}\n"
"}\n");
ASSERT_EQUALS_WITHOUT_LINENUMBERS("[test.cpp:2]: (debug) valueflow.cpp:1035:valueFlowReverse bailout: assignment of abc\n"
"[test.cpp:8]: (debug) valueflow.cpp:1131:valueFlowReverse bailout: variable abc stopping on goto label\n"
"[test.cpp:3]: (debug) valueflow.cpp:1813:valueFlowForward bailout: variable abc. noreturn conditional scope.\n",
errout.str());
}
void valueFlowAfterAssign() {
const char *code;
code = "void f() {\n"
" int x = 123;\n"
" a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
code = "void f() {\n"
" bool x = 32;\n"
" a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 1));
code = "void f() {\n"
" int x = 123;\n"
" a = sizeof(x);\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 123));
code = "void f() {\n"
" int x = 123;\n"
" a = 2 + x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
code = "void f() {\n"
" int x = 9;\n"
" --x;\n"
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 9));
ASSERT_EQUALS(true, testValueOfX(code, 4U, 8));
ASSERT_EQUALS("2,Assignment 'x=9', assigned value is 9\n"
"3,x is decremented', new value is 8\n",
getErrorPathForX(code, 4U));
code = "void x() {\n"
" int x = value ? 6 : 0;\n"
" x =\n"
" 1 + x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 7));
code = "void f() {\n"
" int x = 0;\n"
" y = x += z;\n"
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f() {\n"
" static int x = 2;\n"
" x++;\n"
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 2));
code = "void f() {\n"
" static int x = 2;\n"
" a >> x;\n"
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 2));
code = "void f() {\n"
" static int x = 0;\n"
" if (x==0) x = getX();\n"
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
// function
code = "void f() {\n"
" char *x = 0;\n"
" int success = getx((char**)&x);\n"
" if (success) x[0] = 0;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f() {\n"
" char *x = 0;\n"
" getx(reinterpret_cast<void **>(&x));\n"
" *x = 0;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
// lambda
code = "void f() {\n"
" int x = 0;\n"
" Q q = [&]() {\n"
" if (x > 0) {}\n"
" x++;\n"
" };\n"
" dosomething(q);\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
// ?:
code = "void f() {\n"
" int x = 8;\n"
" a = ((x > 10) ?\n"
" x : 0);\n" // <- x is not 8
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 8));
code = "void f() {\n" // #6973
" char *x = \"\";\n"
" a = ((x[0] == 'U') ?\n"
" x[1] : 0);\n" // <- x is not ""
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, "\"\""));
code = "void f() {\n" // #6973
" char *x = getenv (\"LC_ALL\");\n"
" if (x == NULL)\n"
" x = \"\";\n"
"\n"
" if ( (x[0] == 'U') &&\n" // x can be ""
" (x[1] ?\n" // x can't be ""
" x[3] :\n" // x can't be ""
" x[2] ))\n" // x can't be ""
" {}\n"
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 6U, "\"\""));
ASSERT_EQUALS(false, testValueOfX(code, 7U, "\"\""));
ASSERT_EQUALS(false, testValueOfX(code, 8U, "\"\""));
ASSERT_EQUALS(false, testValueOfX(code, 9U, "\"\""));
code = "void f() {\n" // #7599
" t *x = 0;\n"
" y = (a ? 1 : x\n" // <- x is 0
" && x->y ? 1 : 2);" // <- x is not 0
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f() {\n" // #7599
" t *x = 0;\n"
" y = (a ? 1 : !x\n" // <- x is 0
" || x->y ? 1 : 2);" // <- x is not 0
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
// if/else
code = "void f() {\n"
" int x = 123;\n"
" if (condition) return;\n"
" a = 2 + x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 123));
code = "void f() {\n"
" int x = 1;\n"
" if (condition) x = 2;\n"
" a = 2 + x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 1));
ASSERT_EQUALS(true, testValueOfX(code, 4U, 2));
code = "void f() {\n"
" int x = 123;\n"
" if (condition1) x = 456;\n"
" if (condition2) x = 789;\n"
" a = 2 + x;\n" // <- either assignment "x=123" is redundant or x can be 123 here.
"}";
ASSERT_EQUALS(true, testValueOfX(code, 5U, 123));
code = "void f(int a) {\n"
" int x = 123;\n"
" if (a > 1)\n"
" ++x;\n"
" else\n"
" ++x;\n"
" return 2 + x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 123));
code = "void f() {\n"
" int x = 1;\n"
" if (condition1) x = 2;\n"
" else return;\n"
" a = 2 + x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 1));
code = "void f(){\n"
" int x = 0;\n"
" if (a>=0) { x = getx(); }\n"
" if (x==0) { return; }\n"
" return 123 / x;\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 0));
code = "void f() {\n"
" X *x = getx();\n"
" if(0) { x = 0; }\n"
" else { x->y = 1; }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f() {\n" // #6239
" int x = 4;\n"
" if(1) { x = 0; }\n"
" a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 4));
code = "void f() {\n"
" int x = 32;\n"
" if (x>=32) return;\n"
" a[x]=0;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 32));
code = "void f() {\n"
" int x = 32;\n"
" if (x>=32) {\n"
" a[x] = 0;\n" // <- should have possible value 32
" return;\n"
" }\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 32));
code = "void f() {\n"
" int x = 33;\n"
" if (x==33) goto fail;\n"
" a[x]=0;\n"
"fail:\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 33));
code = "void f() {\n"
" int x = 32;\n"
" if (a==1) { z=x+12; }\n"
" if (a==2) { z=x+32; }\n"
" z = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 32));
ASSERT_EQUALS(true, testValueOfX(code, 4U, 32));
ASSERT_EQUALS(true, testValueOfX(code, 5U, 32));
code = "void f() {\n" // #5656 - FP
" int x = 0;\n"
" if (!x) {\n"
" x = getx();\n"
" }\n"
" y = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 6U, 0));
code = "void f(int y) {\n" // alias
" int x = y;\n"
" if (y == 54) {}\n"
" else { a = x; }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 54));
code = "void f () {\n"
" ST * x = g_pST;\n"
" if (x->y == 0) {\n"
" x = NULL;\n"
" return 1;\n"
" }\n"
" a = x->y;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 7U, 0));
code = "void f () {\n"
" ST * x = g_pST;\n"
" if (x->y == 0) {\n"
" x = NULL;\n"
" goto label;\n"
" }\n"
" a = x->y;\n"
"label:\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 7U, 0));
code = "void f() {\n" // #5752 - FP
" int *x = 0;\n"
" if (x && *x == 123) {\n"
" getx(*x);\n"
" }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f() {\n"
" int x = 0;\n"
" if (!x) {}\n"
" else { y = x; }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f() {\n" // #6118 - FP
" int x = 0;\n"
" x = x & 0x1;\n"
" if (x == 0) { x = 2; }\n"
" y = 42 / x;\n" // <- x is 2
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 5U, 2));
code = "void f() {\n" // #6118 - FN
" int x = 0;\n"
" x = x & 0x1;\n"
" if (x == 0) { x += 2; }\n"
" y = 42 / x;\n" // <- x is 2
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 0));
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 5U, 2));
code = "void f(int mode) {\n"
" struct ABC *x;\n"
"\n"
" if (mode) { x = &y; }\n"
" else { x = NULL; }\n"
"\n"
" if (!x) exit(1);\n"
"\n"
" a = x->a;\n" // <- x can't be 0
"}";
ASSERT_EQUALS(false, testValueOfX(code, 9U, 0));
// multivariables
code = "void f(int a) {\n"
" int x = a;\n"
" if (a!=132) { b = x; }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 132));
code = "void f(int a) {\n"
" int x = a;\n"
" b = x;\n" // <- line 3
" if (a!=132) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 132));
code = "void f() {\n"
" int a;\n"
" if (n) { a = n; }\n"
" else { a = 0; }\n"
" int x = a;\n"
" if (a > 0) { a = b / x; }\n" // <- line 6
"}";
ASSERT_EQUALS(false, testValueOfX(code, 6U, 0)); // x is not 0 at line 6
code = "void f(int x1) {\n" // #6086
" int x = x1;\n"
" if (x1 >= 3) {\n"
" return;\n"
" }\n"
" a = x;\n" // <- x is not 3
"}";
ASSERT_EQUALS(false, testValueOfX(code, 6U, 3));
code = "int f(int *x) {\n" // #5980
" if (!x) {\n"
" switch (i) {\n"
" default:\n"
" throw std::runtime_error(msg);\n"
" };\n"
" }\n"
" return *x;\n" // <- x is not 0
"}";
ASSERT_EQUALS(false, testValueOfX(code, 8U, 0));
code = "void f(int a) {\n" // #6826
" int x = a ? a : 87;\n"
" if (a && x) {}\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 87));
code = "void f() {\n"
" int first=-1, x=0;\n"
" do {\n"
" if (first >= 0) { a = x; }\n" // <- x is not 0
" first++; x=3;\n"
" } while (1);\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
// pointer/reference to x
code = "int f(void) {\n"
" int x = 2;\n"
" int *px = &x;\n"
" for (int i = 0; i < 1; i++) {\n"
" *px = 1;\n"
" }\n"
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 7U, 2));
code = "int f(void) {\n"
" int x = 5;\n"
" int &rx = x;\n"
" for (int i = 0; i < 1; i++) {\n"
" rx = 1;\n"
" }\n"
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 7U, 5));
// break
code = "void f() {\n"
" for (;;) {\n"
" int x = 1;\n"
" if (!abc()) {\n"
" x = 2;\n"
" break;\n"
" }\n"
" a = x;\n" // <- line 8
" }\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 8U, 2)); // x is not 2 at line 8
code = "void f() {\n"
" int x;\n"
" switch (ab) {\n"
" case A: x = 12; break;\n"
" case B: x = 34; break;\n"
" }\n"
" v = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 7U, 12));
ASSERT_EQUALS(true, testValueOfX(code, 7U, 34));
code = "void f() {\n" // #5981
" int x;\n"
" switch (ab) {\n"
" case A: x = 12; break;\n"
" case B: x = 34; break;\n"
" }\n"
" switch (ab) {\n"
" case A: v = x; break;\n" // <- x is not 34
" }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 8U, 34));
// while/for
code = "void f() {\n" // #6138
" ENTRY *x = 0;\n"
" while (x = get()) {\n"
" set(x->value);\n" // <- x is not 0
" }\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f(const int *buf) {\n"
" int x = 0;\n"
" for (int i = 0; i < 10; i++) {\n"
" if (buf[i] == 123) {\n"
" x = i;\n"
" break;\n"
" }\n"
" }\n"
" a = x;\n" // <- x can be 0
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 9U, 0)); // x can be 0 at line 9
code = "void f(const int *buf) {\n"
" int x = 0;\n"
" for (int i = 0; i < 10; i++) {\n"
" if (buf[i] == 123) {\n"
" x = i;\n"
" ;\n" // <- no break
" }\n"
" }\n"
" a = x;\n" // <- x can't be 0
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 9U, 0)); // x can't be 0 at line 9
code = "void f(const int *buf) {\n"
" int x = 0;\n"
" while (++i < 10) {\n"
" if (buf[i] == 123) {\n"
" x = i;\n"
" break;\n"
" }\n"
" }\n"
" a = x;\n" // <- x can be 0
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 9U, 0)); // x can be 0 at line 9
code = "void f(const int a[]) {\n" // #6616
" const int *x = 0;\n"
" for (int i = 0; i < 10; i = *x) {\n" // <- x is not 0
" x = a[i];\n"
" }\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
// alias
code = "void f() {\n" // #7778
" int x = 0;\n"
" int *p = &x;\n"
" x = 3;\n"
" *p = 2;\n"
" a = x;\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 6U, 3));
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 6U, 2));
}
void valueFlowAfterCondition() {
const char *code;
// in if
code = "void f(int x) {\n"
" if (x == 123) {\n"
" a = x;\n"
" }\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
code = "void f(int x) {\n"
" if (x != 123) {\n"
" a = x;\n"
" }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 123));
// in else
code = "void f(int x) {\n"
" if (x == 123) {}\n"
" else a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 123));
code = "void f(int x) {\n"
" if (x != 123) {}\n"
" else a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
// after if
code = "void f(int x) {\n"
" if (x == 10) {\n"
" x++;\n"
" }\n"
" a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 10));
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 5U, 11));
// !
code = "void f(int x) {\n"
" if (!x) { a = x; }\n"
" else a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
code = "void f(int x, int y) {\n"
" if (!(x&&y)) { return; }\n"
" a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
code = "void f(int x) {\n"
" if (!x) { { throw new string(); }; }\n"
" a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
// if (var)
code = "void f(int x) {\n"
" if (x) { a = x; }\n" // <- x is not 0
" else { b = x; }\n" // <- x is 0
" c = x;\n" // <- x might be 0
"}";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 4U, 0));
// After while
code = "void f(int x) {\n"
" while (x != 3) {}\n"
" a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 3));
code = "void f(int x) {\n"
" while (11 != (x = dostuff())) {}\n"
" a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 11));
code = "void f(int x) {\n"
" while (11 != (x = dostuff()) && y) {}\n"
" a = x;\n"
"}";
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 3U, 11));
code = "void f(int x) {\n"
" while (x = dostuff()) {}\n"
" a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
code = "void f(const Token *x) {\n" // #5866
" x = x->next();\n"
" while (x) { x = x->next(); }\n"
" if (x->str()) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 0));
code = "void f(const Token *x) {\n"
" while (0 != (x = x->next)) {}\n"
" x->ab = 0;\n"
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
code = "void f(const Token* x) {\n"
" while (0 != (x = x->next)) {}\n"
" if (x->str) {\n" // <- possible value 0
" x = y;\n" // <- this caused some problem
" }\n"
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
// conditional code after if/else/while
code = "void f(int x) {\n"
" if (x == 2) {}\n"
" if (x > 0)\n"
" a = x;\n" // <- TODO, x can be 2
" else\n"
" b = x;\n"
"}";
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 4U, 2));
ASSERT_EQUALS(false, testValueOfX(code, 6U, 2));
// condition with 2nd variable
code = "void f(int x) {\n"
" int y = 0;\n"
" if (x == 7) { y = 1; }\n"
" if (!y)\n"
" a = x;\n" // <- x can not be 7 here
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 7));
code = "void f(struct X *x) {\n"
" bool b = TRUE;\n"
" if(x) { }\n"
" else\n"
" b = FALSE;\n"
" if (b)\n"
" abc(x->value);\n" // <- x is not 0
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 7U, 0));
// In condition, after && and ||
code = "void f(int x) {\n"
" a = (x != 3 ||\n"
" x);\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 3));
code = "void f(int x) {\n"
" a = (x == 4 &&\n"
" x);\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 4));
// protected usage with &&
code = "void f(const Token* x) {\n"
" if (x) {}\n"
" for (; x && \n"
" x->str() != y; x = x->next()) {}\n"
"}";
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f(const Token* x) {\n"
" if (x) {}\n"
" if (x && \n"
" x->str() != y) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
// return
code = "void f(int x) {\n" // #6024
" if (x == 5) {\n"
" if (z) return; else return;\n"
" }\n"
" a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 5));
code = "void f(int x) {\n" // #6730
" if (x == 5) {\n"
" if (z) continue; else throw e;\n"
" }\n"
" a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 5));
// TODO: float
code = "void f(float x) {\n"
" if (x == 0.5) {}\n"
" a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
// aliased variable
code = "void f() {\n"
" int x = 1;\n"
" int *data = &x;\n"
" if (!x) {\n"
" calc(data);\n"
" a = x;\n" // <- x might be changed by calc
" }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 6U, 0));
}
void valueFlowForwardCompoundAssign() {
const char *code;
code = "void f() {\n"
" int x = 123;\n"
" x += 43;\n"
" return x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 166));
ASSERT_EQUALS("2,Assignment 'x=123', assigned value is 123\n"
"3,Compound assignment '+=', assigned value is 166\n",
getErrorPathForX(code, 4U));
code = "void f() {\n"
" int x = 123;\n"
" x /= 0;\n" // don't crash when evaluating x/=0
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 123));
code = "void f() {\n"
" float x = 123.45;\n"
" x += 67;\n"
" return x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 123.45F + 67, 0.01F));
}
void valueFlowForwardCorrelatedVariables() {
const char *code;
code = "void f(int x = 0) {\n"
" bool zero(x==0);\n"
" if (zero) a = x;\n" // <- x is 0
" else b = x;\n" // <- x is not 0
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
}
void valueFlowForwardFunction() {
const char *code;
code = "class C {\n"
"public:\n"
" C(int &i);\n" // non-const argument => might be changed
"};\n"
"int f() {\n"
" int x=1;\n"
" C c(x);\n"
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 8U, 1));
code = "class C {\n"
"public:\n"
" C(const int &i);\n" // const argument => is not changed
"};\n"
"int f() {\n"
" int x=1;\n"
" C c(x);\n"
" return x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 8U, 1));
}
void valueFlowForwardLambda() {
const char *code;
code = "void f() {\n"
" int x=1;\n"
" auto f = [&](){ a=x; }\n" // x is not 1
" x = 2;\n"
" f();\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 1));
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 3U, 2));
code = "void f() {\n"
" int x=3;\n"
" auto f = [&](){ a=x; }\n" // todo: x is 3
" f();\n"
"}";
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 3U, 3));
}
void valueFlowBitAnd() {
const char *code;
code = "int f(int a) {\n"
" int x = a & 0x80;\n"
" return x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code,3U,0));
ASSERT_EQUALS(true, testValueOfX(code,3U,0x80));
code = "int f(int a) {\n"
" int x = a & 0x80 ? 1 : 2;\n"
" return x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code,3U,0));
ASSERT_EQUALS(false, testValueOfX(code,3U,0x80));
code = "int f() {\n"
" int x = (19 - 3) & 15;\n"
" return x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code,3U,0));
ASSERT_EQUALS(false, testValueOfX(code,3U,16));
}
void valueFlowSwitchVariable() {
const char *code;
code = "void f(int x) {\n"
" a = x;\n" // <- x can be 14
" switch (x) {\n"
" case 14: a=x+2; break;\n" // <- x is 14
" };\n"
" a = x;\n" // <- x can be 14
"}";
ASSERT_EQUALS(true, testConditionalValueOfX(code, 2U, 14));
ASSERT_EQUALS(true, testConditionalValueOfX(code, 4U, 14));
ASSERT_EQUALS(true, testConditionalValueOfX(code, 6U, 14));
ValueFlow::Value value = valueOfTok(code, "+");
ASSERT_EQUALS(16, value.intvalue);
ASSERT(value.isKnown());
}
void valueFlowForLoop() {
const char *code;
code = "void f() {\n"
" for (int x = 0; x < 10; x++)\n"
" a[x] = 0;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 3U, 9));
ASSERT_EQUALS(false, testValueOfX(code, 3U, 10));
code = "void f() {\n"
" int x;\n"
" for (x = 2; x < 1; x++)\n"
" a[x] = 0;\n" // <- not 2
" b = x;\n" // 2
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 2));
ASSERT_EQUALS(true, testValueOfX(code, 5U, 2));
code = "void f() {\n"
" int x;\n"
" for (x = 2; x < 1; ++x)\n"
" a[x] = 0;\n" // <- not 2
" b = x;\n" // 2
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 2));
ASSERT_EQUALS(true, testValueOfX(code, 5U, 2));
code = "enum AB {A,B};\n" // enum => handled by valueForLoop2
"void f() {\n"
" int x;\n"
" for (x = 1; x < B; ++x)\n"
" a[x] = 0;\n" // <- not 1
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 1));
code = "void f(int a) {\n"
" for (int x = a; x < 10; x++)\n"
" a[x] = 0;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 9));
code = "void f() {\n"
" for (int x = 0; x < 10; x = x + 2)\n"
" a[x] = 0;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 3U, 8));
ASSERT_EQUALS(false, testValueOfX(code, 3U, 10));
code = "void f() {\n"
" for (int x = 0; x < 10; x = x / 0)\n"
" a[x] = 0;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0)); // don't crash
code = "void f() {\n"
" for (int x = 0; x < 10; x++)\n"
" x<4 ?\n"
" a[x] : 0;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 3U, 9));
ASSERT_EQUALS(false, testValueOfX(code, 4U, 9));
code = "void f() {\n"
" for (int x = 0; x < 10; x++)\n"
" x==0 ?\n"
" 0 : a[x];\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f() {\n" // #5223
" for (int x = 0; x < 300 && x < 18; x++)\n"
" x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 3U, 17));
ASSERT_EQUALS(false, testValueOfX(code, 3U, 299));
code = "void f() {\n"
" int x;\n"
" for (int i = 0; x = bar[i]; i++)\n"
" x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f() {\n"
" const char abc[] = \"abc\";\n"
" int x;\n"
" for (x = 0; abc[x] != '\\0'; x++) {}\n"
" a[x] = 0;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 5U, 3));
code = "void f() {\n" // #5939
" int x;\n"
" for (int x = 0; (x = do_something()) != 0;)\n"
" x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
code = "void f() {\n"
" int x;\n"
" for (int x = 0; x < 10 && y = do_something();)\n"
" x;\n"
"}";
TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 4U, 0));
code = "void f() {\n"
" int x,y;\n"
" for (x = 0, y = 0; x < 10, y < 10; x++, y++)\n" // usage of ,
" x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 0));
code = "void foo(double recoveredX) {\n"
" for (double x = 1e-18; x < 1e40; x *= 1.9) {\n"
" double relativeError = (x - recoveredX) / x;\n"
" }\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
// &&
code = "void foo() {\n"
" for (int x = 0; x < 10; x++) {\n"
" if (x > 1\n"
" && x) {}" // <- x is not 0
" }\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 4U, 9));
code = "void foo() {\n"
" for (int x = 0; x < 10; x++) {\n"
" if (x < value\n"
" && x) {}" // <- maybe x is not 9
" }\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 9));
// ||
code = "void foo() {\n"
" for (int x = 0; x < 10; x++) {\n"
" if (x == 0\n"
" || x) {}" // <- x is not 0
" }\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 4U, 9));
// After loop
code = "void foo() {\n"
" int x;\n"
" for (x = 0; x < 10; x++) {}\n"
" a = x;\n"
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 10));
code = "void foo() {\n"
" int x;\n"
" for (x = 0; 2 * x < 20; x++) {}\n"
" a = x;\n"
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 10));
code = "void foo() {\n" // related with #887
" int x;\n"
" for (x = 0; x < 20; x++) {}\n"
" a = x++;\n"
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 20));
code = "void f() {\n"
" int x;\n"
" for (x = 0; x < 5; x++) {}\n"
" if (x == 5) {\n"
" panic();\n"
" }\n"
" a = x;\n" // <- x can't be 5
"}";
ASSERT_EQUALS(false, testValueOfX(code, 7U, 5));
code = "void f() {\n"
" int x;\n"
" for (x = 0; x < 5; x++) {}\n"
" if (x < 5) {}\n"
" else return;\n"
" a = x;\n" // <- x can't be 5
"}";
ASSERT_EQUALS(false, testValueOfX(code, 6U, 5));
// assert after for loop..
code = "static void f() {\n"
" int x;\n"
" int ctls[10];\n"
" for (x = 0; x <= 10; x++) {\n"
" if (cond)\n"
" break;\n"
" }\n"
" assert(x <= 10);\n"
" ctls[x] = 123;\n" // <- x can't be 11
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 9U, 11));
// hang
code = "void f() {\n"
" for(int i = 0; i < 20; i++)\n"
" n = (int)(i < 10 || abs(negWander) < abs(negTravel));\n"
"}";
testValueOfX(code,0,0); // <- don't hang
// conditional code in loop
code = "void f(int mask) {\n" // #6000
" for (int x = 10; x < 14; x++) {\n"
" int bit = mask & (1 << i);\n"
" if (bit) {\n"
" if (bit == (1 << 10)) {}\n"
" else { a = x; }\n" // <- x is not 10
" }\n"
" }\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 6U, 10));
// #7886 - valueFlowForLoop must be called after valueFlowAfterAssign
code = "void f() {\n"
" int sz = 4;\n"
" int x,y;\n"
" for(x=0,y=0; x < sz && y < 10; x++)\n"
" a = x;\n" // <- max value is 3
"}";
ASSERT_EQUALS(true, testValueOfX(code, 5U, 3));
}
void valueFlowSubFunction() {
const char *code;
code = "void f1(int x) { return x; }\n"
"void f2(int x) {\n"
" f1(123);\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 1U, 123));
code = "void f1(int x) { return x; }\n"
"void f2(int x) {\n"
" f1(x);\n"
" if (x==0){}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 1U, 0));
code = "void f1(int x) {\n"
" if (x == 0) return;\n"
" int y = 1234 / x;\n"
"}\n"
"\n"
"void f2() {\n"
" f1(0);\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
code = "void f1(int x) {\n"
" if (x == 0) return;\n"
" int y = x;\n"
"}\n"
"\n"
"void f2() {\n"
" f1(x&4);\n" // possible {0,4}
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 3U, 4));
code = "void f1(int x) { a=x; }\n"
"void f2(int y) { f1(y<123); }\n";
ASSERT_EQUALS(true, testValueOfX(code, 1U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 1U, 1));
code = "void f1(int x) { a=(abc)x; }\n"
"void f2(int y) { f1(123); }\n";
ASSERT_EQUALS(true, testValueOfX(code, 1U, 123));
code = "void f1(int x) {\n"
" x ?\n"
" 1024 / x :\n"
" 0; }\n"
"void f2() { f1(0); }";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
code = "void f1(int *x) {\n"
" if (x &&\n"
" *x) {}\n"
"}\n"
"void f2() { f1(0); }";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
// #5861 - fp with float
code = "void f1(float x) {\n"
" return 1.0 / x;\n"
"}\n"
"void f2() { f1(0.5); }";
ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
code = "void dostuff(int x) {\n"
" return x/x;\n"
"}\n"
"\n"
"void test(int x) {\n"
" if(x==1) {}\n"
" dostuff(x+1);\n"
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 2U, 2));
code = "void leaveNotifyEvent(const XCrossingEvent * const) { }\n"
"void motionNotifyEvent() {\n"
" leaveNotifyEvent(0);\n"
"}";
testValueOfX(code, 2U, 2); // No complaint about Token::Match called with varid 0. (#6443)
// #6560 - multivariables
code = "void f1(int x) {\n"
" int a = x && y;\n"
" int b = a ? x : 0;\n"
"}\n"
"void f2() {\n"
" f1(0);\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
code = "class A\n"
"{\n"
" void f1(int x) { return x; }\n"
" void f2(int x) {\n"
" f1(123);\n"
" }\n"
"};";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
code = "class A\n"
"{\n"
" virtual void f1(int x) { return x; }\n"
" void f2(int x) {\n"
" f1(123);\n"
" }\n"
"};";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
code = "void foo(int x, int y) {\n"
" if (y == 1) {\n"
" a = x;\n" // <- x is not 1
" }\n"
"}\n"
"\n"
"void bar() {\n"
" foo(1, 10);\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 1));
}
void valueFlowFunctionReturn() {
const char *code;
code = "int f1(int x) {\n"
" return x+1;\n"
"}\n"
"void f2() {\n"
" x = 10 - f1(2);\n"
"}";
ASSERT_EQUALS(7, valueOfTok(code, "-").intvalue);
ASSERT_EQUALS(true, valueOfTok(code, "-").isKnown());
code = "int add(int x, int y) {\n"
" return x+y;\n"
"}\n"
"void f2() {\n"
" x = 1 * add(10+1,4);\n"
"}";
ASSERT_EQUALS(15, valueOfTok(code, "*").intvalue);
ASSERT_EQUALS(true, valueOfTok(code, "*").isKnown());
code = "int one() { return 1; }\n"
"void f() { x = 1 * one(); }";
ASSERT_EQUALS(1, valueOfTok(code, "*").intvalue);
ASSERT_EQUALS(true, valueOfTok(code, "*").isKnown());
code = "int add(int x, int y) {\n"
" return x+y;\n"
"}\n"
"void f2() {\n"
" x = 1 * add(1,add(2,3));\n"
"}";
ASSERT_EQUALS(6, valueOfTok(code, "*").intvalue);
ASSERT_EQUALS(true, valueOfTok(code, "*").isKnown());
code = "int f(int i, X x) {\n"
" if (i)\n"
" return g(std::move(x));\n"
" g(x);\n"
" return 0;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 4U, ValueFlow::Value::MovedVariable));
code = "class A\n"
"{\n"
" int f1(int x) {\n"
" return x+1;\n"
" }\n"
" void f2() {\n"
" x = 10 - f1(2);\n"
" }\n"
"};";
ASSERT_EQUALS(7, valueOfTok(code, "-").intvalue);
ASSERT_EQUALS(true, valueOfTok(code, "-").isKnown());
code = "class A\n"
"{\n"
" virtual int f1(int x) {\n"
" return x+1;\n"
" }\n"
" void f2() {\n"
" x = 10 - f1(2);\n"
" }\n"
"};";
ASSERT_EQUALS(7, valueOfTok(code, "-").intvalue);
ASSERT_EQUALS(false, valueOfTok(code, "-").isKnown());
}
void valueFlowFunctionDefaultParameter() {
const char *code;
code = "class continuous_src_time {\n"
" continuous_src_time(std::complex<double> f, double st = 0.0, double et = infinity) {}\n"
"};";
testValueOfX(code, 2U, 2); // Don't crash (#6494)
}
bool isNotKnownValues(const char code[], const char str[]) {
const std::list<ValueFlow::Value> values = tokenValues(code, str);
for (std::list<ValueFlow::Value>::const_iterator it = values.begin(); it != values.end(); ++it) {
if (it->isKnown())
return false;
}
return true;
}
void knownValue() {
const char *code;
ValueFlow::Value value;
ASSERT(valueOfTok("x = 1;", "1").isKnown());
// after assignment
code = "void f() {\n"
" int x = 1;\n"
" return x + 2;\n" // <- known value
"}";
value = valueOfTok(code, "+");
ASSERT_EQUALS(3, value.intvalue);
ASSERT(value.isKnown());
{
code = "void f() {\n"
" int x = 15;\n"
" if (x == 15) { x += 7; }\n" // <- condition is true
"}";
value = valueOfTok(code, "==");
ASSERT_EQUALS(1, value.intvalue);
ASSERT(value.isKnown());
code = "int f() {\n"
" int a = 0, x = 0;\n"
" a = index();\n"
" if (a != 0)\n"
" x = next();\n"
" return x + 1;\n"
"}\n";
value = valueOfTok(code, "+");
ASSERT(value.isPossible());
}
code = "void f() {\n"
" int x;\n"
" if (ab) { x = 7; }\n"
" return x + 2;\n" // <- possible value
"}";
value = valueOfTok(code, "+");
ASSERT_EQUALS(9, value.intvalue);
ASSERT(value.isPossible());
code = "void f(int c) {\n"
" int x = 0;\n"
" if (c) {} else { x++; }\n"
" return x + 2;\n" // <- possible value
"}";
ASSERT(isNotKnownValues(code, "+"));
code = "void f() {\n"
" int x = 0;\n"
" fred.dostuff(x);\n"
" if (x < 0) {}\n"
"}\n";
ASSERT(isNotKnownValues(code, "<"));
code = "void dostuff(int x);\n"
"void f() {\n"
" int x = 0;\n"
" dostuff(x);\n"
" if (x < 0) {}\n"
"}\n";
value = valueOfTok(code, "<");
ASSERT_EQUALS(0, value.intvalue);
ASSERT(value.isKnown());
code = "void dostuff(int & x);\n"
"void f() {\n"
" int x = 0;\n"
" dostuff(x);\n"
" if (x < 0) {}\n"
"}\n";
ASSERT(isNotKnownValues(code, "<"));
code = "void dostuff(const int & x);\n"
"void f() {\n"
" int x = 0;\n"
" dostuff(x);\n"
" if (x < 0) {}\n"
"}\n";
value = valueOfTok(code, "<");
ASSERT_EQUALS(0, value.intvalue);
ASSERT(value.isKnown());
code = "void f() {\n"
" int x = 0;\n"
" do {\n"
" if (x < 0) {}\n"
" fred.dostuff(x);\n"
" } while (abc);\n"
"}\n";
ASSERT(isNotKnownValues(code, "<"));
code = "int x;\n"
"void f() {\n"
" x = 4;\n"
" while (1) {\n"
" a = x+2;\n"
" dostuff();\n"
" }\n"
"}";
ASSERT(isNotKnownValues(code, "+"));
code = "void f() {\n"
" int x = 0;\n"
" if (y) { dostuff(x); }\n"
" if (!x) {}\n"
"}\n";
ASSERT(isNotKnownValues(code, "!"));
code = "void f() {\n"
" int x = 0;\n"
" MACRO( v, { if (y) { x++; } } );\n"
" if (!x) {}\n"
"}\n";
ASSERT(isNotKnownValues(code, "!"));
code = "void f() {\n"
" int x = 0;\n"
" for (int i = 0; i < 10; i++) {\n"
" if (cond) {\n"
" x = 1;\n"
" break;\n"
" }\n"
" }\n"
" if (!x) {}\n" // <- possible value
"}";
ASSERT(isNotKnownValues(code, "!"));
code = "void f() {\n"
" int x = 0;\n"
" switch (state) {\n"
" case 1:\n"
" x = 1;\n"
" break;\n"
" }\n"
" if (!x) {}\n" // <- possible value
"}";
ASSERT(isNotKnownValues(code, "!"));
code = "void f() {\n" // #7049
" int x = 0;\n"
" switch (a) {\n"
" case 1:\n"
" x = 1;\n"
" case 2:\n"
" if (!x) {}\n" // <- possible value
" }\n"
"}";
ASSERT(isNotKnownValues(code, "!"));
code = "void f() {\n"
" int x = 0;\n"
" while (!x) {\n" // <- possible value
" scanf(\"%d\", &x);\n"
" }\n"
"}";
value = valueOfTok(code, "!");
ASSERT_EQUALS(1, value.intvalue);
ASSERT(value.isPossible());
code = "void f() {\n"
" int x = 0;\n"
" do { } while (++x < 12);\n" // <- possible value
"}";
ASSERT(isNotKnownValues(code, "<"));
code = "void f() {\n"
" static int x = 0;\n"
" return x + 1;\n" // <- known value
"}\n";
value = valueOfTok(code, "+");
ASSERT_EQUALS(1, value.intvalue);
ASSERT(value.isKnown());
code = "void f() {\n"
" int x = 0;\n"
"a:\n"
" a = x + 1;\n" // <- possible value
"}";
value = valueOfTok(code, "+");
ASSERT_EQUALS(1, value.intvalue);
ASSERT(value.isPossible());
// in conditional code
code = "void f(int x) {\n"
" if (!x) {\n"
" a = x+1;\n" // <- known value
" }\n"
"}";
value = valueOfTok(code, "+");
ASSERT_EQUALS(1, value.intvalue);
ASSERT(value.isKnown());
code = "void f(int x) {\n"
" if (a && 4==x && y) {\n"
" a = x+12;\n" // <- known value
" }\n"
"}";
value = valueOfTok(code, "+");
ASSERT_EQUALS(16, value.intvalue);
ASSERT(value.isKnown());
// after condition
code = "int f(int x) {\n"
" if (x == 4) {}\n"
" return x + 1;\n" // <- possible value
"}";
value = valueOfTok(code, "+");
ASSERT_EQUALS(5, value.intvalue);
ASSERT(value.isPossible());
code = "int f(int x) {\n"
" if (x < 2) {}\n"
" else if (x >= 2) {}\n" // <- known value
"}";
value = valueOfTok(code, ">=");
ASSERT_EQUALS(1, value.intvalue);
ASSERT(value.isKnown());
code = "int f(int x) {\n"
" if (x < 2) {}\n"
" else if (x > 2) {}\n" // <- possible value
"}";
ASSERT(isNotKnownValues(code, ">"));
// function
code = "int f(int x) { return x + 1; }\n" // <- possible value
"void a() { f(12); }";
value = valueOfTok(code, "+");
ASSERT_EQUALS(13, value.intvalue);
ASSERT(value.isPossible());
// known and possible value
code = "void f() {\n"
" int x = 1;\n"
" int y = 2 + x;\n" // <- known value, don't care about condition
" if (x == 2) {}\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 1)); // value of x can be 1
ASSERT_EQUALS(false, testValueOfX(code, 3U, 2)); // value of x can't be 2
// calculation with known result
code = "int f(int x) { a = x & 0; }"; // <- & is 0
value = valueOfTok(code, "&");
ASSERT_EQUALS(0, value.intvalue);
ASSERT(value.isKnown());
// Ticket #7139
// "<<" in third expression of for
code = "void f(void) {\n"
" int bit, x;\n"
" for (bit = 1, x = 0; bit < 128; bit = bit << 1, x++) {\n"
" z = x;\n" // <- known value [0..6]
" }\n"
"}\n";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 0));
ASSERT_EQUALS(true, testValueOfX(code, 4U, 6));
ASSERT_EQUALS(false, testValueOfX(code, 4U, 7));
ASSERT(value.isKnown());
}
void valueFlowSizeofForwardDeclaredEnum() {
const char *code = "enum E; sz=sizeof(E);";
valueOfTok(code, "="); // Don't crash (#7775)
}
void valueFlowGlobalVar() {
const char *code;
code = "int x;\n"
"void f() {\n"
" x = 4;\n"
" a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 4));
code = "int x;\n"
"void f() {\n"
" if (x == 4) {}\n"
" a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 4U, 4));
code = "int x;\n"
"void f() {\n"
" x = 42;\n"
" unknownFunction();\n"
" a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 42));
}
void valueFlowGlobalStaticVar() {
const char *code;
code = "static int x = 321;\n"
"void f() {\n"
" a = x;\n"
"}";
ASSERT_EQUALS(true, testValueOfX(code, 3U, 321));
code = "static int x = 321;\n"
"void f() {\n"
" a = x;\n"
"}"
"void other() { x=a; }\n";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 321));
code = "static int x = 321;\n"
"void f() {\n"
" a = x;\n"
"}"
"void other() { p = &x; }\n";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 321));
code = "static int x = 321;\n"
"void f() {\n"
" a = x;\n"
"}"
"void other() { x++; }\n";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 321));
code = "static int x = 321;\n"
"void f() {\n"
" a = x;\n"
"}"
"void other() { foo(x); }\n";
ASSERT_EQUALS(false, testValueOfX(code, 3U, 321));
}
void valueFlowInlineAssembly() {
const char* code = "void f() {\n"
" int x = 42;\n"
" asm(\"\");\n"
" a = x;\n"
"}";
ASSERT_EQUALS(false, testValueOfX(code, 5U, 42));
}
void valueFlowUninit() {
const char* code;
std::list<ValueFlow::Value> values;
code = "void f() {\n"
" int x;\n"
" switch (x) {}\n"
"}";
values = tokenValues(code, "x )");
ASSERT_EQUALS(true, values.size()==1U && values.front().isUninitValue());
code = "void f() {\n"
" C *c;\n"
" if (c->x() == 4) {}\n"
"}";
values = tokenValues(code, "c .");
ASSERT_EQUALS(true, values.size()==1U && values.front().isUninitValue());
code = "void f() {\n"
" int **x;\n"
" y += 10;\n"
" x = dostuff(sizeof(*x)*y);\n"
"}";
ASSERT_EQUALS(0U, tokenValues(code, "x )").size());
// #8036
code = "void foo() {\n"
" int x;\n"
" f(x=3), return x+3;\n"
"}";
ASSERT_EQUALS(0U, tokenValues(code, "x +").size());
// #8195
code = "void foo(std::istream &is) {\n"
" int x;\n"
" if (is >> x) {\n"
" a = x;\n"
" }\n"
"}";
values = tokenValues(code, "x ; }");
ASSERT_EQUALS(true, values.empty());
// return (#8173)
code = "int repeat() {\n"
" const char *n;\n"
" return((n=42) && *n == 'A');\n"
"}";
values = tokenValues(code, "n ==");
ASSERT_EQUALS(true, values.size() != 1U || !values.front().isUninitValue());
}
};
REGISTER_TEST(TestValueFlow)
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