Commit Graph

1051 Commits

Author SHA1 Message Date
orbitcowboy 85a26802e3 Running astyle [ci skip] 2020-03-01 20:39:00 +01:00
Paul Fultz II 6ea4f60600
Enable valueFlowSubfunction for multiple parameters (#2550) 2020-03-01 16:46:20 +01:00
Oliver Stöneberg 1863ccb0a7
fixed Clang warnings about unused variables (#2554) 2020-02-26 14:52:43 +01:00
Paul Fultz II 392060aefe
Fix issue 7804: ValueFlow: possible value in second if body (#2543) 2020-02-19 07:55:04 +01:00
Daniel Marjamäki 95ac456e13 Fixed #9582 (false positive "error: Out of bounds access" with std::array and constant) 2020-02-19 07:36:02 +01:00
Armin Müller 75b1ade316
Typos found by running "codespell" (#2542) 2020-02-17 18:28:58 +01:00
Paul Fultz II 3b20684aca
Fix issue 9360: False positive: arrayIndexOutOfBounds when function is called with different array sizes (#2541) 2020-02-17 10:31:08 +01:00
amai2012 efeb7deb7a Run dmake and astyle 2020-02-16 19:58:09 +01:00
Paul Fultz II 921887a281
Use valueFlowGeneric for valueFlowForwardExpression (#2537) 2020-02-16 16:02:22 +01:00
Daniel Marjamäki e04b9fe4a4 Remove unused functions 2020-02-14 20:37:33 +01:00
Daniel Marjamäki 5f4a900f88 astyle formatting
[ci skip]
2020-02-13 17:04:05 +01:00
Paul Fultz II 7368a54629
Add generic valueflow forward analysis (#2511) 2020-02-13 16:27:06 +01:00
Daniel Marjamäki 3ec03b8915 Fixed #9571 (False positive: containerSize) 2020-02-12 18:53:36 +01:00
Paul Fultz II 8fa7dd0fe0
Fix issue 9595: False positive: Using pointer to temporary doesn't account for const ref extended temporary lifetimes (#2525) 2020-02-10 18:01:11 +01:00
Daniel Marjamäki 2b336ac147 Refactoring; stricter lambda capture 2020-02-01 08:28:18 +01:00
Daniel Marjamäki 6c1cc54671 Refactoring; Avoid template<> 2020-02-01 08:24:31 +01:00
Rikard Falkeborn 0bb98aeef9 Fix 9577 (endless recursion in Valueflow::bifurcate()) (#2492)
Ensure bifurcate() does not recurse endlessly where a variable is
initialized recursively, or a variable is initialized as x(0) or x{0}
followed by a recursive assignment (for example int x(0); x = x / 1;).

The first case is solved by bailing out if there initialization is done
using x(0) or x{0}, the second by adding a missing depth argument to a
recursive call.
2020-01-17 03:17:26 +01:00
Daniel Marjamäki 380cc78077 Clang; Run ValueFlow 2020-01-11 14:00:41 +01:00
Daniel Marjamäki 6b983a9587 Revert ValueFlow changes, there was unexpected problems in testrunner 2020-01-11 13:11:19 +01:00
Daniel Marjamäki 052eaba632 Clang; run ValueFlow analysis 2020-01-11 13:04:51 +01:00
Daniel Marjamäki 96ff57e275 ValueFlow; Refactoring 2020-01-11 09:17:32 +01:00
Daniel Marjamäki a9dbf129f0 Clang import; some small tweaks 2020-01-09 13:52:17 +01:00
Daniel Marjamäki 1589ac5352 Clang import; Set links properly 2020-01-09 12:42:29 +01:00
Paul Fultz II 90f82d0374 Fix issue 9541: false negative: knownConditionTrueFalse (#2473)
* Fix issue 9541: false negative: knownConditionTrueFalse

* Add another test case

* Add another test

* Fix FPs

* Format

* Fix compile error

* Remove double conditions

* Fix compile error
2020-01-05 16:25:33 +01:00
Paul Fultz II e1a97c524d Fix issue 9554: False positive: The address of local variable 'x' is accessed at non-zero index. (#2470)
* Fix issue 9554: False positive: The address of local variable 'x' is accessed at non-zero index.

* Format

* Remove unnecesary condition check
2020-01-04 11:39:52 +01:00
Paul Fultz II 82c91f9484 Fix issue 9550: False positive: Same iterator is used with containers 'x' that are defined in different scopes (#2463) 2019-12-31 08:09:04 +01:00
Paul Fultz II 75de485c4d Fix issue 9551: Out-of-bounds in getLifetimeTokens() (#2461) 2019-12-29 08:23:58 +01:00
Daniel Marjamäki 31bddb6ae0 astyle formatting
[ci skip]
2019-12-26 15:48:29 +01:00
Paul Fultz II ce1fc56e96 Fix issue 6890: ValueFlow: min/max value for variable, after condition (#2460)
* Set bounds when combining values

* Adust bounds when they are negated

* Try to infer conditional values

* Switch false and true

* Fix checking of conditions

* Fix compare

* Fix remaining tests

* Fix overflows
2019-12-26 15:47:53 +01:00
Paul Fultz II 42d44f02a2 Use lifetime analysis for checking mismatching containers (#2456)
* Use lifetimes to check for mismatching containers

* Fix error messages

* Format

* Remove unused variables

* Fix configuration and track iterators through algorithms

* Fix iterator value types in qt config

* Fix library issue with QStringList

* Remove unused functions

* Fix cppcheck errors
2019-12-25 09:32:50 +01:00
Daniel Marjamäki fe23d017f3 Fixed #8419 (False positive accessMoved on int) 2019-12-21 07:39:14 +01:00
Daniel Marjamäki 33ec78fe6e Fixed #9036 (false positive: (style) Condition 's.x<127U' is always true) 2019-12-20 19:06:35 +01:00
Daniel Marjamäki a241be0ecc Fixed #9434 (False positive: Out of bounds access when using const pointer) 2019-12-15 20:10:28 +01:00
Daniel Marjamäki bcfc5924fa Fixed #9532 (False positive: Out of bounds access in expression 'v[0]' because 'v' is empty.) 2019-12-14 19:04:19 +01:00
Rikard Falkeborn 1c92170179 ValueFlow: Remove unused argument (#2442) 2019-12-10 17:48:27 +01:00
Sebastian 95e0b0d0f9
Fix #9510: Crash in valueflow.cpp solveExprValues() (division by zero) (#2420)
`break` if divider `intval` is 0 to avoid division by 0 as suggested by @pfultz2
Trac ticket: https://trac.cppcheck.net/ticket/9510
2019-12-06 08:08:40 +01:00
versat e712df7cb4 Run astyle [ci skip] 2019-12-04 13:53:10 +01:00
Paul Fultz II 36977becba Fix issue 9196: Lambda confuses check (#2415) 2019-12-03 18:30:52 +01:00
Paul Fultz II 79a2e61721 Fix issue 6850: Valueflow: pointer alias, conditional value (#2402) 2019-11-30 09:22:03 +01:00
Paul Fultz II f9d33c07f8 Fix issue 9458: Crash with shadow variables in a lambda (#2406)
* Fix issue 9458: Crash with shadow variables in a lambda

* Format
2019-11-29 09:45:02 +01:00
Paul Fultz II 4ebf54d090 Fix issue 9437: Dont assume init list constructor for strings (#2366)
* Fix issue 9437: Dont assume init list constuctor for strings

* Update the schema

* Add documentation
2019-11-17 03:22:04 +01:00
Paul Fultz II 7841430793 Fix issue 9428: FP uninitvar for pointer passed to sscanf (#2344)
* Add indirect to library cfg files

* Check indirect for non null arguments

* Reenable subfunction analysis

* Use indirect 1 when using not-null

* Parse correct string name

* Update documentation

* Make attribute optional
2019-11-13 12:46:54 +01:00
Paul Fultz II c75bbbe253 Fix issue 9404: False positive: Either the condition 'if(x)' is redundant or there is possible null pointer dereference: a->x (#2322)
* Fix issue 9404: False positive: Either the condition 'if(x)' is redundant or there is possible null pointer dereference: a->x

* Use simpleMatch

* Add a test case for the FP

* Check if expression is changed

* Check for no return scope

* Use simpleMatch
2019-11-08 08:11:41 +01:00
Paul Fultz II 2e955d0f22 Fix issue 9453: False positive: danglingLifetime, address of array argument (#2335) 2019-11-07 09:33:17 +01:00
Paul Fultz II d1f225b8ee Fix issue 9201: FP: returnDanglingLifetime on pointer to variable of static struct (#2303)
* Fix issue 9201: FP: returnDanglingLifetime on pointer to variable of static struct

* Fix capture of non-local variables in lambdas
2019-11-05 07:10:32 +01:00
Paul Fultz II c38bbb75e4 Fix issue 9448: Check for temporaries from library function calls (#2312) 2019-11-03 22:02:10 +01:00
Daniel Marjamäki 6e9d496ab3 ValueFlow: handling of char literal size before ValueType has been set 2019-10-31 14:06:46 +01:00
Paul Fultz II 694d147097 Refactor ProgramMemory and PathAnalysis (#2311)
* Traverse conditions for container size

* Move program memory to seperate file

* Revert "Traverse conditions for container size"

This reverts commit 914783769f.

* Move pathanalysis to seperate files
2019-10-30 17:57:46 +01:00
Rikard Falkeborn f83eb127ae ValueFlow: sizeof string and char literals (#2285) 2019-10-20 21:02:28 +02:00
Daniel Marjamäki 78c02f0505 ValueFlow: Fixed false positives after escape scope 2019-10-20 20:57:16 +02:00
Daniel Marjamäki e50b9e2bef Fixed #8784 (False positive uninitialized variable) 2019-10-20 15:20:05 +02:00
Rikard Falkeborn 5c061c1c12 Set correct type and size of string and char literals (#2275)
* Set correct type and size of string and char literals

Use that string and char literal tokens store the prefix. This makes
it possible to distinghuish between different type of string literals
(i.e., utf8 encoded strings, utf16, wide strings, etc) which have
different type.

When the tokens holding the string and character values have the correct
type, it is possible to improve Token::getStrSize() to give the correct
result for all string types. Previously, it would return the number of
characters in the string, i.e., it would give the wrong size unless
the type of the string was char*.

Since strings now can have different size (in number of bytes) and
length (in number of elements), add a new helper function that returns
the number of characters. Checkers have been updated to use the correct
functions.

Having the size makes it possible to find more problems with prefixed
strings, and to reduce false positives, for example in the buffer
overflow checker.

Also, improve the stringLiteralWrite error message to also print the
prefix of the string (if there is one).

* Add comment and update string length
2019-10-20 07:11:57 +02:00
Daniel Marjamäki 9a2b71494f ValueFlow: Set value for :: 2019-10-19 21:08:59 +02:00
Daniel Marjamäki e0093c99ce Fixed #9276 (False positive: ValueFlow does not handle return in switch properly.) 2019-10-18 16:16:56 +02:00
Daniel Marjamäki 3a0a0fdefb Fixed #9424 (False positive: known condition after function call) 2019-10-18 08:21:07 +02:00
Daniel Marjamäki 15d7b9c83f Fixed #9347 (FP uninitvar for pointer passed to sscanf) 2019-10-17 17:41:54 +02:00
Ken-Patrick Lehrmann 24211cf8b9 Fix crashes in valueflow (#2236)
* Fix crashes in valueflow

http://cppcheck1.osuosl.org:8000/crash.html

For instance in http://cppcheck1.osuosl.org:8000/styx
```
==19651==ERROR: AddressSanitizer: SEGV on unknown address 0x00000000001c (pc 0x556f21abc3df bp 0x7ffc140d2720 sp 0x7ffc140d2710 T0)
==19651==The signal is caused by a READ memory access.
==19651==Hint: address points to the zero page.
    #0 0x556f21abc3de in Variable::isGlobal() const ../lib/symboldatabase.h:342
    #1 0x556f221f801a in valueFlowForwardVariable ../lib/valueflow.cpp:2471
    #2 0x556f22208130 in valueFlowForward ../lib/valueflow.cpp:3204
    #3 0x556f221e9e14 in valueFlowReverse ../lib/valueflow.cpp:1892
    #4 0x556f221f1a43 in valueFlowBeforeCondition ../lib/valueflow.cpp:2200
    #5 0x556f2223dbb5 in ValueFlow::setValues(TokenList*, SymbolDatabase*, ErrorLogger*, Settings const*) ../lib/valueflow.cpp:6521
    #6 0x556f220e5991 in Tokenizer::simplifyTokens1(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ../lib/tokenize.cpp:2342
    #7 0x556f21d8d066 in CppCheck::checkFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::istream&) ../lib/cppcheck.cpp:508
    #8 0x556f21d84cd3 in CppCheck::check(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ../lib/cppcheck.cpp:192
    #9 0x556f21a28796 in CppCheckExecutor::check_internal(CppCheck&, int, char const* const*) ../cli/cppcheckexecutor.cpp:884
    #10 0x556f21a24be8 in CppCheckExecutor::check(int, char const* const*) ../cli/cppcheckexecutor.cpp:198
    #11 0x556f22313063 in main ../cli/main.cpp:95
```

* Add test case for crash in valueflow
2019-10-16 20:54:07 +02:00
Paul Fultz II 19cf636a4a Move necessary code into valuetype (#2265)
* Fix parsing of smart pointers

* Improve deduction of return type

* Valuetype computation for decayed pointers
2019-10-12 11:40:02 +02:00
Paul Fultz II 4eb4762d95 Extend lifetime checking to temporaries (#2242)
* Use lifetimes to check for returning reference to temporaries

* Check for dangling temporaries

* Check for unknown types for returining by reference

* Remove old returnTemporary check

* Format

* Check for deref op

* Ternary operator return an lvalue reference

* Warn when returning temporaries from member functions

* Improve handling of pointer to function

* Extend lifetimes of const references
2019-10-08 09:28:39 +02:00
Daniel Marjamäki 954e98cc03 astyle formatting
[ci skip]
2019-10-05 16:32:43 +02:00
Paul Fultz II cf1c766292 Fix issue 9317: False positive returnDanglingLifetime when using reference to constant inside if statement (#2241) 2019-10-05 16:32:20 +02:00
Paul Fultz II 997803869d Forward values after assignment in valueFlowReverse (#2226)
* Forward values after assignment in valueFlowReverse

* Rename variables

* Format
2019-10-03 09:58:57 +02:00
orbitcowboy f05e21efa8 Formatted the code, there are no functional changes [ci skip]. 2019-10-01 08:39:08 +02:00
Paul Fultz II 166bd2bafc Fix issue 2153: valueFlowAfterCondition: struct member (#2228)
* Fix issue 2153: valueFlowAfterCondition: struct member

* Fix null pointer dereference

* Formatting

* Check for another null pointer

* Initialize variables

* Remove redundant condition

* Format

* Add missing initialization to copy constructor

* Format
2019-09-30 21:04:43 +02:00
Armin Müller b4af8bdc2e Typos found by running "codespell" (#2227) 2019-09-29 21:23:19 +02:00
Daniel Marjamäki 2dc477571c Fix gcc compiler warnings 2019-09-28 20:50:56 +02:00
Oliver Stöneberg 1fa4df419a avoid some unnecessary copies in emplace_back() calls (#2194) 2019-09-28 20:22:46 +02:00
Daniel Marjamäki b55c587ab2 astyle formatting
[ci skip]
2019-09-26 10:32:49 +02:00
Paul Fultz II 597d0fa35b Support expression in valueFlowAfterCondition (#2219)
* Add valueFlowForwardExpression function to forward values of an expression

* Use token for expression

* Fix name in bailout message

* Handle expressions

* Add more tests for more expressions

* Add more tests

* Solve the expression if possible

* Formatting
2019-09-26 10:32:25 +02:00
Paul Fultz II 0df4876059 Fix issue 9367: FP knownConditionTrueFalse (#2209) 2019-09-24 08:15:03 +02:00
Paul Fultz II 1616282f6b Use fixed number of iterations for valueflow loop (#2205) 2019-09-23 19:35:39 +02:00
Paul Fultz II a903aa7070 Fix issue 9351: false negative: (style) Condition '...' is always true (#2201) 2019-09-23 08:49:04 +02:00
Paul Fultz II c1961cec1c Fix issue 9362: FP: (style) Condition '(v&1)==0' is always false (#2200) 2019-09-21 19:53:54 +02:00
Paul Fultz II 40f1635c35 Fix issue 9361: false positive: (style) Condition 'isdigit(c)!=0' is always true (#2199) 2019-09-21 08:19:54 +02:00
Paul Fultz II ad8abdb0c3 Add impossible values to ValueFlow (#2186)
* Add impossible category

* Replace values

* Try to adjust known values

* Add ! for impossible values

* Add impossible with possible values

* Remove contradictions

* Add values when the branch is not dead

* Only copy possible values

* Dont bail on while loops

* Load std lib in valueflow

* Check for function calls

* Fix stl errors

* Fix incorrect impossible check

* Fix heap-after-use error

* Remove impossible values when they are lowered

* Show the bound and remove overlaps

* Infer conditions

* Dont push pointer values through dynamic_cast

* Add test for dynamic_cast issue

* Add shifttoomanybits test

* Add test for div by zero

* Add a test for issue 9315

* Dont make impossible value inconclusive

* Fix FP with shift operator

* Improve handleKnownValuesInLoop for impossible values

* Fix cppcheck warning

* Fix impossible values for ctu

* Bailout for streams

* Check equality conditions

* Fix overflows

* Add regression test for 9332

* Remove duplicate conditions

* Skip impossible values for invalid value

* Check for null

* Rename bound to range

* Formatting
2019-09-20 15:06:37 +02:00
Paul Fultz II ba037837c9 Track lifetime across multiple returns
This will now warn when doing something like this:

```cpp
template <class T, class K, class V>
const V& get_default(const T& t, const K& k, const V& v) {
    auto it = t.find(k);
    if (it == t.end()) return v;
    return it->second;
}
const int& bar(const std::unordered_map<int, int>& m, int k) {
    auto x = 0;
    return get_default(m, k, x);
}
```

The lifetime warning is considered inconclusive in this case.

I also updated valueflow to no tinject inconclusive values unless `--inconclusive` flag is passed. This creates some false negatives because library functions are not configured to not modify their input parameters, and there are some checks that do not check if the value is inconclusive or not.
2019-09-11 19:25:09 +02:00
warmsocks a56bc006b7 Fixed a typo in lib/checkother.cpp. Corrected spelling errors found by codespell. (#2170) 2019-09-11 19:21:38 +02:00
Daniel Marjamäki bee30b0ca2 astyle formatting
[ci skip]
2019-09-10 19:42:17 +02:00
Paul Fultz II dc0b3527ad Fix issue 9311: False positive duplicateCondition "same if condition" with pointer inside array of struct (#2166)
* Check for typeOf through an array

* Handle array constructors

* Format

* Fix compile error on gcc 4.8
2019-09-10 19:41:35 +02:00
Paul Fultz II ddb1f1b5ce Try to fix issue 9341: daca crash: isContainerSizeChangedByFunction (#2168) 2019-09-10 19:39:44 +02:00
Paul Fultz II 27ebff7ae4 Add deeper analysis of when a function changes a containers size (#2149)
* Add deeper analysis of when a function changes a containers size

* Fix issues

* Track addressOf
2019-09-06 21:18:45 +02:00
Paul Fultz II 9e140831eb Fix issue 9329: FP knownConditionTrueFalse - vector modified by function calls (#2145) 2019-09-05 16:42:26 +02:00
Paul Fultz II 1afd56e964 Fix issue 8785: ValueFlow: Track pointer alias
This fixes the issue by making `ProgramMemory` keep track of values based on the conditions.

It also removes the `deadpointer` check since it duplicates the `invalidLifetime` check.
2019-09-03 17:16:15 +02:00
Paul Fultz II dc201d110d Fix issue 9274: false negative: (error) Buffer is accessed out of bounds (std::string, std::wstring) 2019-09-03 06:43:54 +02:00
Paul Fultz II cb509f1a8b Fix issue 4845: alias to vector element invalid after vector is changed (#2113)
* Try harder to track ref lifetimes

* Dont add lifetimes for references

* Use correct token

* Check for front and back as well

* Improve handling of addresses

* Formatting

* Fix FP
2019-09-02 06:58:09 +02:00
Paul Fultz II 121093658d Fix issue 9202: False positive: std::array, size is a constant (#2132) 2019-09-01 09:44:34 +02:00
Daniel Marjamäki 1a25d3f9ec astyle formatting
[ci skip]
2019-08-30 18:34:14 +02:00
Paul Fultz II 0b9e823fc8 Fix issue 9305: False positive uninitvar - struct initialized via function (#2123) 2019-08-30 18:32:45 +02:00
Paul Fultz II 2942be53f7 Add more tests for valueFlowUninit (#2124) 2019-08-30 08:41:17 +02:00
Paul Fultz II 03fe6795bf Fix issue 9302: FP uninitvar - struct accessed via pointer (#2121) 2019-08-29 08:38:50 +02:00
Daniel Marjamäki a47633c4b9 Added TODO comment 2019-08-26 06:56:29 +02:00
Paul Fultz II 5c488b9519 Fix issue 9190: FP uninitvar for struct member (#2112)
* Fix issue 9190: FP uninitvar for struct member

* Add more test cases

* Fix false negative
2019-08-24 11:27:47 +02:00
Paul Fultz II c0a8d628b9 Fix issue 6010: Uninitialized inner struct (#2098)
* Fix issue 6010: Uninitialized inner struct

* Show to root variable that is unitialized

* Warn on pointer dereferences
2019-08-23 06:23:20 +02:00
Paul Fultz II ee7fe3aaa1 Fix FP: Unitialized variable when using a pointer
This fixes the FP in cases like this:

```cpp
void f() {
    bool b;
    bool * x = &b;
    if (x != nullptr)
        x = 1;
}
```

It tracks the indirection of the uninit value in valueflow.
2019-08-17 07:36:41 +02:00
Paul Fultz II 3aef0c9bd3 Fix issue 8715: regression uninitvar not detected (#2092) 2019-08-16 07:48:54 +02:00
Paul Fultz II ef714225bb Use library to track container lifetimes 2019-08-15 21:14:54 +02:00
Daniel Marjamäki a57d22d2d9 astyle formatting
[ci skip]
2019-08-15 10:46:16 +02:00
Paul Fultz II af214e8212 Fix issue 8825: ValueFlow: uninitialized struct member (#2087)
* Pass uninit value across pointers

* Add more testing
2019-08-15 10:44:55 +02:00
Paul Fultz II 0c1dff5c93 Fix issue 9268: false negative: (style) Condition '...' is always true (#2080)
* Fix issue 9268: false negative: (style) Condition '...' is always true

* Fix copy and paste mistake
2019-08-14 06:34:27 +02:00
Paul Fultz II 13df5b2413 Fix FP with negative index and negated condition (#2081) 2019-08-14 06:32:31 +02:00
Paul Fultz II c0c6f92221 Fix issue 8431 and 8776: Size of constant string
Fixes these cases:

```cpp
void f(void) {
        const std::string msg="xyz";
        if(!msg.empty()){} // Always true
}
```

And out of bounds access:

```cpp
#include <string>
char fstr1(){const std::string s = "<a><b>"; return s[42]; }
wchar_t fwstr1(){const std::wstring s = L"<a><b>"; return s[42]; }
```
2019-08-12 20:24:16 +02:00
Paul Fultz II 68e8253920 Fix issue 8313 and 7326: Track values of pointer aliases in valueflow 2019-08-12 12:58:53 +02:00
Paul Fultz II 9aa97cbb95 Fix issue 8296: ValueFlow: value not set in conditional scope in subfunction (#2071)
* Fix issue 8296: ValueFlow: value not set in conditional scope in subfunction

* Refactor condition checkingg

* Make test case TODO
2019-08-11 15:39:37 +02:00
Paul Fultz II bd02ca5ccb Fix issue 9207: Not detected 'always true' and unreachable code 2019-08-08 07:46:47 +02:00
Paul Fultz II aaeec462e6 Re-enable valueFlowSubFunction (#2063)
* Re-enable valueFlowSubFunction

* Formatting

* Skip ternary operators in subfunctions

* Fix test with iostreams

* Fix FP with multiple parameters
2019-08-05 16:26:32 +02:00
Paul Fultz II ffdd2dc793 Fix issue 8924: Re-enable valueFlowTerminatingCondition 2019-08-05 07:18:06 +02:00
Daniel Marjamäki ce53931d00 Fixed #9251 (False positive: unininitialized variable (multi variables)) 2019-08-03 21:12:34 +02:00
amai2012 f02636e995 Refactoring: Convert enums to enum classes 2019-08-02 21:14:29 +02:00
Daniel Marjamäki e8ec6e6f11 Fixed #8349 (Noisy nullPointerRedundantCheck) 2019-07-27 20:03:06 +02:00
Paul Fultz II b049fd9303 Improve propogation of lifetimes of function arguments
This will now warn for cases like this:

```cpp
int* f(int * x) {
    return x;
}
int * g(int x) {
    return f(&x);
}
````
2019-07-26 07:02:07 +02:00
Daniel Marjamäki 45d1ca6f7c Safe checks: Clarify a warning message 2019-07-25 17:19:51 +02:00
Daniel Marjamäki fb7f18ddea ValueFlow: fix false detection of duplicate values 2019-07-24 12:30:33 +02:00
Daniel Marjamäki cab9f61b79 safe checks: Handle float parameters 2019-07-24 12:09:13 +02:00
Daniel Marjamäki e0738c48d2 simplify code 2019-07-24 11:40:51 +02:00
Daniel Marjamäki 10be2a1941 Safe checks: container parameters 2019-07-24 11:39:35 +02:00
Paul Fultz II 3ec3bd52e0 Fix FP when using a pointer to a container (#2029) 2019-07-24 00:04:49 +02:00
Paul Fultz II ab0fcc7640 Fix issue 9216: reset() method confusion (#2025)
* Fix issue 9216 with smart pointer reset

* Check for arrow
2019-07-23 22:45:58 +02:00
Paul Fultz II 60b670babd Fix issue 9219: False positive, returnDanglingLifetime (#2026)
* Check for pointer deref for container methods

* Formatting
2019-07-23 21:59:05 +02:00
Paul Fultz II a08a9c1349 Switch to use lifetime analysis for iterators and pointers to invalid containers
This will diagnose more issues such as:

```cpp
void f(std::vector<int> &v) {
    auto v0 = v.begin();
    v.push_back(123);
    std::cout << *v0 << std::endl;
}
```
2019-07-18 10:56:44 +02:00
Daniel Marjamäki f0aeb845e5 ValueFlow: Clarify warnings when argument min/max values are used 2019-07-17 22:17:34 +02:00
Daniel Marjamäki b4a05a3dd0 Refactoring: Use enum class 2019-07-16 11:12:35 +02:00
Daniel Marjamäki 32eda27391 Refactoring: Use enum class 2019-07-16 10:51:26 +02:00
Daniel Marjamäki 38182bf37b Replace 'unsigned' with 'nonneg' in valueflow 2019-07-15 13:47:17 +02:00
Daniel Marjamäki 68cc7516a1 Annotations: Add annotation __cppcheck_in_range__(low,high) 2019-07-12 11:09:54 +02:00
Daniel Marjamäki 783f7f1648 Rename safeValues to unknownValues 2019-07-11 16:05:48 +02:00
Daniel Marjamäki a9d61c4ddd Fix Cppcheck warning 2019-07-10 22:08:27 +02:00
Daniel Marjamäki 5f217021ab Another attempt to fix appveyor 2019-07-10 21:30:50 +02:00
Daniel Marjamäki 45844ef962 Try to fix appveyor. Replace int64_t with MathLib::bigint. 2019-07-10 21:26:20 +02:00
Daniel Marjamäki 05d35b063d Function return: Extra check of safe function return values 2019-07-10 20:00:21 +02:00
Daniel Marjamäki c9906125de Safe functions: Check more possible function argument values 2019-07-10 16:59:05 +02:00
Daniel Marjamäki 9f548efbd3 Refactoring: enum class 2019-07-10 15:27:07 +02:00
Paul Fultz II b0d10273ed Fix issue 3695: Handle class pointers
This switches to use lifetime analysis to check for assigning to non-local variables:

```cpp
class test
{
public:

  void f()
  {
    int x;
    this->ptr = &x;
  }

protected:
  int *ptr;
};
```
2019-07-07 10:16:19 +02:00
Rikard Falkeborn 839fcddd8a Fix #6115 (Add support to realloc to cfg files) (#1953)
* Allow to configure realloc like functions

* memleakonrealloc: Bring back tests.

The old memleak checker was removed, and the tests for it was removed in
commit 9765a2dfab. This also removed the
tests for memleakOnRealloc. Bring back those tests, somewhat modified
since the checker no longer checks for memory leaks.

* Add realloc to mem leak check

* Add tests of realloc buffer size

* Configure realloc functions

* Add test of freopen

* Allow to configure which element is realloc argument

* Fix wrong close in test

cppcheck now warns for this

* Update manual

* Update docs

* Rename alloc/dalloc/realloc functions

Naming the member function realloc caused problems on appveyor. Rename
the alloc and dealloc functions as well for consistency.

* Change comparisson order

* Remove variable and use function call directly

* Create temporary variable to simplify

* Throw mismatchError on mismatching allocation/reallocation

* Refactor to separate function

* Fix potential nullptr dereference

As pointed out by cppcheck.
2019-07-05 12:44:52 +02:00
shaneasd 7e54f989f9 Update symbol database such that the override keyword implies that the function is also virtual (#1907)
* Update symbol database such that the override keyword implies that the function is also virtual

* Add test case for implicit override

* change isVirtual to hasVirtualSpecifier

* fix method documentation for getVirtualFunctionCalls and getFirstVirtualFunctionCallStack

* Fix isImplicitlyVirtual to consider the override keyword and document logic

* Fix getFirstVirtualFunctionCallStack and getVirtualFunctionCalls to use isImplicitlyVirtual instead of isVirtual so new test case passes
2019-07-04 12:32:32 +02:00
Scott Furry a195477470 Correct Zero/Null as pointer constant (#1938)
Building with enhanced clang warnings indicated a large number of
instances with the warning:

`warning: zero as null pointer constant`

Recommended practice in C++11 is to use `nullptr` as value for
a NULL or empty pointer value. All instances where this warning
was encountered were corrected in this commit.

Where warning was encountered in dependency code (i.e. external library)
no chnages were made. Patching will be offered upstream.
2019-06-30 21:39:22 +02:00
Daniel Marjamäki 56df6169fb Fixed #8356 (ValueFlow: variable is not changed in for loop) 2019-06-30 17:50:35 +02:00
Rikard Falkeborn d1d622b74c Valueflow: support global static const variables (#1861) 2019-06-29 14:33:55 +02:00
Paul Fultz II 66e0f06494 Fixx issue 9163: FP returnDanglingLifetime - returning std::string::find (#1912)
* Fixx issue 9163: FP returnDanglingLifetime - returning std::string::find

* Use simpleMatch
2019-06-24 18:52:17 +02:00
Rikard Falkeborn d909ac8565 Bugfix buffer size for strdup like functions (#1893)
strdup() allocates the string length plus one for a terminating null
character. Add one to compensate for this.

Fixes false positive buffer out of bounds on code like this:

	void f() {
		const char *a = "abcd";
		char * b = strdup(a);
		printf("%c", b[4]); // prints the terminating null character
		free(b);
	}

Also, add a testcase for valueFlowDynamicBufferSize() and add tests for
strdup(), malloc() and calloc().
2019-06-16 16:02:27 +02:00
Ken-Patrick 66ebc187f6 Cleanup some const_cast of Token* (#1886)
* Add non const version of some methods of Token

The aim is to reduce the (ab)use of const_cast.

* Cleanup some more const_cast in valueflow

* Remove useless const_cast

* Remove some const_cast from templatesimplifier

* Remove some const_cast from valueflow
2019-06-16 10:09:38 +02:00
Paul Fultz II 6ae7be0f53 Fix FP with lifetime containers (#1865) 2019-06-02 10:14:48 +02:00
Paul Fultz II f75c15af56 Fix issue 6821: New check: access heap/stack data using address of variable
This fixes errors with:

```cpp
int f() {
    int i;
    return (&i)[1];
}
```

It uses the lifetime analysis to detect the issues.
2019-05-31 12:24:31 +02:00
Paul Fultz II 108cdaa485 Fix FP with unreadVariable (#1859) 2019-05-31 08:06:36 +02:00
orbitcowboy 55df395a4e Running astyle [ci skip] 2019-05-30 14:41:14 +02:00
Ken-Patrick 3cdc236e10 Fix false positive with several ! (not) operators (#1856)
With the following code
  int f(int x, int y) {
      if (!!(x != 0)) {
        return y/x;
  }

cppcheck would wrongly warn that there might be a division by zero in
"return y/x;".
2019-05-29 09:45:15 +02:00
Carlo Marcelo Arenas Belón bf5c71bdca sync (#1835)
* build: remove -Wabi and add -Wundef

gcc >= 8 throws a warning about -Wabi (without a specific ABI version)
being ignored, while -Wundef seems more useful (as shown by the change
in config.h, which was probably an unfortunate typo)

travis.yaml should probably be updated soon, but was left out from this
change as the current images don't yet need it

* lib: unused function in valueflow

refactored out since 8c03be3212

lib/valueflow.cpp:3124:21: warning: unused function 'endTemplateArgument' [-Wunused-function]

* readme: include picojson

* make: also clean exe
2019-05-17 09:31:41 +02:00
Paul Fultz II 4e94c64da8 Fix issue 9099 and 9102: Incorrect valueflow for global variables (#1832) 2019-05-14 08:58:27 +02:00
Paul Fultz II 8c03be3212 Fix issue 9077: False positive: Returning pointer to local variable (#1821)
* Avoid implicit conversion for lifetimes

* Fix issue 9077

* Add more tests

* Rename function

* Fix implicit conversion with containers

* Format

* Fix crash
2019-05-05 11:40:59 +02:00
Paul Fultz II a688df0ea1 Fix issue 9120: crash in valueflow (#1822) 2019-05-05 09:51:36 +02:00
Daniel Marjamäki 0b3342abe5 Fix Cppcheck warning 2019-05-04 20:41:43 +02:00
Paul Fultz II 091f4bcf8d Add check for unnecessary search before insertion
This will warn for cases where searching in an associative container happens before insertion, like this:

```cpp
void f1(std::set<unsigned>& s, unsigned x) {
    if (s.find(x) == s.end()) {
        s.insert(x);
    }
}

void f2(std::map<unsigned, unsigned>& m, unsigned x) {
    if (m.find(x) == m.end()) {
        m.emplace(x, 1);
    } else {
        m[x] = 1;
    }
}
```

In the case of the map it could be written as `m[x] = 1` as it will create the key if it doesnt exist, so the extra search is not necessary.

I have this marked as `performance` as it is mostly concerning performance, but there could be a copy-paste error possibly, although I dont think thats common.
2019-05-02 11:04:23 +02:00
Daniel Marjamäki 6c3c090403 Fixed #6317 (wrong simplification: int i = 1.5; return i; get simplified to: return 1.5;) 2019-05-01 17:05:16 +02:00
Rikard Falkeborn 1cc5f3abe7 Set wchar_t type (#1807)
This is necessary for valueflow to know the size, for example when
calculating sizeof(wchar_t).
2019-05-01 16:34:28 +02:00
Paul Fultz II 71bd7f68d4 Fix bug in lifetime constructors (#1816) 2019-05-01 07:52:52 +02:00
Daniel Marjamäki 66064fb2bb Disable valueFlowGlobalConstVar until #9099 is fixed 2019-04-30 20:51:59 +02:00
Daniel Marjamäki b1ca7c9a66 astyle formatting
[ci skip]
2019-04-26 11:30:35 +02:00
Paul Fultz II 39f4374446 Improve diagnostics with null smart pointers (#1805)
* Warn when dereferencing null smart pointers

* Improve tracking of smart pointer values

* Use library isSmartPointer
2019-04-26 11:30:09 +02:00
Gary Leutheuser bca2dfb3f4 Implement #7597 - valueflow: global constant (#1802)
* Implement const global value flow

* Tabs to spaces
2019-04-21 06:54:32 +02:00
Rikard Falkeborn d23e987941 Fix CheckInternal warnings (#1790) 2019-04-06 06:55:46 +02:00
Daniel Marjamäki 55433fce40 Library: added bufferSize parameters 2019-03-20 19:26:57 +01:00
Daniel Marjamäki 14528bcf25 Library: allowed values for the buffer-size attribute: malloc/calloc/strdup 2019-03-20 06:46:55 +01:00
Paul Fultz II 774464eabb Fix issue 8996: False positive duplicateCondition
This fixes issue 8996 by improving the alias checking by using lifetime analysis. It also extends the lifetime checker to handle constructors and initializer lists for containers and arrays.
2019-03-19 06:25:10 +01:00
Daniel Marjamäki 3c85d8a8ac ValueFlow: Better info for buffer size values 2019-03-17 19:02:36 +01:00
Daniel Marjamäki 92f4113b59 Array index: Checking array index out of bounds for dynamic buffers 2019-03-17 13:09:15 +01:00
Daniel Marjamäki b984897526 ValueFlow: Fix sizeof for array of library type 2019-03-13 18:31:41 +01:00
Daniel Marjamäki 11e32ff445 ValueFlow: Handle compound assignments in execute() 2019-03-12 18:53:58 +01:00
Daniel Marjamäki 7b17b33a49 ValueFlow: fix handling of sizeof(*p) 2019-03-11 20:32:24 +01:00
Daniel Marjamäki 5563fef7bb Fixed #9008 (new crash in clang test suite) 2019-02-28 20:34:07 +01:00
Daniel Marjamäki 857681a049 Make quick fix for uninitialized variable false positive. Will look more at this soon. 2019-02-28 09:52:52 +01:00
rikardfalkeborn c9efc26578 valueflow: Mark getLifetimeToken() static (#1703)
Fixes a compiler warning about missing declaration.
2019-02-26 23:35:11 +01:00
Paul Fultz II fd3c1fd040 Fix issue 1777: Undefined Behavior: Comparing pointers to different objects
This uses the lifetime analysis to check when comparing pointer that point to different objects:

```cpp
int main(void)
{
    int foo[10];
    int bar[10];
    int diff;

    if(foo > bar)   // Undefined Behavior
    {
       diff = 1;
    }

    return 0;
}
```
2019-02-23 08:32:08 +01:00
Paul Fultz II 507c7a4388 Improvement to lifetime tracking of addressof and derefencing
This will now warn for cases like this:

```cpp
auto& f() {
    std::vector<int> x;
    return x[0];
}
```

It also improves the handling of address of operator, so it can now warn across some function calls, like this:

```cpp
int& f(int& a) {
    return a;
}
int* hello() {
    int x = 0;
    return &f(x);
}
```
2019-02-22 06:38:56 +01:00
Paul Fultz II 715714f4de Forward lifetimes in "for" loops (#1682)
* Forward lifetimes in for loops

* Format
2019-02-22 06:37:02 +01:00
Daniel Marjamäki 9337af8965 astyle formatting 2019-02-09 08:48:10 +01:00
Paul Fultz II 797eccc203 Fix possible out of bounds access on arguments (#1652)
* Fix possible outbounds access on arguments

* Log a warning when the arguments mismatch

* Format
2019-02-09 08:47:36 +01:00
Daniel Marjamäki bd7790fd8c Update copyright year 2019-02-09 07:24:06 +01:00
Paul Fultz II c176775afb Avoid infinite recursion in getLifetimeVariable (#1634)
* Fix direct recursion

* Limit depth of getLifetimeVariable
2019-01-31 10:34:41 +01:00
Paul Fultz II 165a22ed0f Lifetime: Support analysis with functions that do not return a reference (#1632)
* Initial support for function return

* Add test case

* Add support for reference parameters

* Format
2019-01-29 09:47:52 +01:00
Paul Fultz II d6aaf401df Lifetime: Follow functions that return references
This will now warn for cases like this:

```cpp
int& f(int& a) {
    return a;
}
int& hello() {
    int x = 0;
    return f(x);
}
```
2019-01-26 11:03:57 +01:00
Paul Fultz II 3975913637 Extend lifetime checking for references
This will use the lifetime checker for dangling references. It will find these cases for indirectly assigned reference:

```cpp
int &foo()
{
    int s = 0;
    int& x = s;
    return x;
}
```

This will also fix issue 510 as well:

```cpp
int &f( int k )
{
    static int &r = k;
    return r;
}
```
2019-01-23 07:29:16 +01:00
Paul Fultz II 4b37f276c2 ValueFlow: Set arrays to true when converting to a boolean
This sets it by checking the parent. It doesn't handle function parameters yet.
2019-01-21 20:05:35 +01:00
Paul Fultz II 5fa956a597 Fix issue 8932: False positive knownConditionTrueFalse - valueflow ignores operator < (#1584) 2019-01-11 08:39:23 +01:00
practicalswift 0a1b3a9d6f Fix typos (#1568) 2019-01-06 17:15:57 +01:00
Daniel Marjamäki 5636497c0b Fixed #8863 (false positive: (warning) Accessing an item in container 's'. Either the condition 's.empty()' is redundant or 's' can be empty.) 2019-01-06 12:21:55 +01:00
Paul Fultz II bba6dfb8b2 Fix issue 4744: ValueFlow: known integer result
This fixes valueflow to have a value for `||` operator here:

```cpp
bool f()
{
	bool a = (4 == 3); // <-- 0
	bool b = (3 == 3); // <-- 1
	return a || b; // <-- 1
}
```
2019-01-03 07:05:31 +01:00
Daniel Marjamäki 2b63997c2c Fixed #8928 (false positive: (style) Variable 'x' is assigned a value that is never used.) 2019-01-02 20:23:02 +01:00
Daniel Marjamäki 39ceb53578 Comment out code in valueFlowArray. There was too many false positives. 2019-01-02 19:57:11 +01:00
Daniel Marjamäki 39a96a5a16 ValueFlow: Temporarily comment out valueFlowTerminatingCondition 2019-01-02 19:42:08 +01:00
Daniel Marjamäki 115be7dfc8 ValueFlow: better FwdAnalysis for complex expressions 2019-01-01 18:23:47 +01:00
Daniel Marjamäki be7afac875 ValueFlow: remove handling of == for complex expressions it did not work properly 2019-01-01 17:23:46 +01:00
Daniel Marjamäki 20436ea986 Fix compiler warning 2019-01-01 17:04:47 +01:00
rikardfalkeborn 13ffefc8b8 Valueflow: Fix right shift with more than 31 bits (#1553)
When comparing if the shift is large enough to make the result zero, use
an unsigned long long to make sure the result fits. Also, a check that
avoids setting the value if the shift is equal to or larger than the
number of bits in the operand (this is undefined behaviour). Finally,
add a check to make sure the calculated value is not too large to store.

Add test cases to cover this.

This was detected by an MSVC warning.

valueflow.cpp(1350): warning C4334: '<<' : result of 32-bit shift implicitly
                     converted to 64 bits (was 64-bit shift intended?)
2019-01-01 14:15:50 +01:00
Daniel Marjamäki ed514644b8 Renamed FwdAnalysisAllPaths to FwdAnalysis 2018-12-31 18:00:47 +01:00
Daniel Marjamäki 4918a18bfb ValueFlow: Value of expression after condition 2018-12-31 17:37:38 +01:00
Daniel Marjamäki 141ce7cd63 ValueFlow: Use FwdAnalysisAllPaths in ValueFlow to track complex expressions 2018-12-31 17:05:46 +01:00
Carlo Marcelo Arenas Belón 5ae6861a0f clang warnings (#1547)
* valueflow: remove unused variable known

since e4677ae640 will trigger :

lib/valueflow.cpp:506:20: warning: unused variable 'known' [-Wunused-variable]
        const bool known = (parent->astOperand1()->hasKnownValue() ||

* templatesimplifier: cleanup

since 48c960f56c showing:

lib/templatesimplifier.h:279:16: warning: private field 'mTokenizer' is not used
      [-Wunused-private-field]
    Tokenizer *mTokenizer;
2018-12-30 11:32:48 +01:00
Paul Fultz II e4677ae640 Fix issue 8910: Regression: ValueFlow: wrong conditional tokvalue
This fixes issue in:

```cpp
void f()
{
    char stack[512];
    RGNDATA *data;

    if (data_size > sizeof (stack))
        data = malloc (data_size);
    else
        data = (RGNDATA *)stack;

    if ((char *)data != stack)
            free (data); // <- data is not stack
}
```

It seems the `ProgramMemory` can't handle two known values(such as int and tok) together. So instead `ValueFlowAfterAssign` runs `ValueFlowForward` with tok values and then runs it with the other values.
2018-12-29 09:31:21 +01:00
rikardfalkeborn 036fcf7827 Fix warnings (#1541)
* Fix reorder warning

* Fix override warnings

Clang warns about missing overrides.

* Remove unused function

* Add missing argument to function calls
2018-12-28 12:59:05 +01:00
Daniel Marjamäki a40fe3c67f Fixed #7872 (ValueFlow: static_cast) 2018-12-27 21:33:01 +01:00
Daniel Marjamäki bc34f0239d Disable the subfunction value flow analysis. It does not work well and needs to be rewritten. There are false positives. 2018-12-18 14:36:49 +01:00
Paul Fultz II 34330b51d1 Fix issue 8905: Condition 'a==0' is always false
This fixes the FP in:

```cpp
void f(const int a[]){ if (a == 0){} }
```
2018-12-18 08:16:43 +01:00
Paul Fultz II 025881cf35 Fix issue 8829: Condition '...' is always true (int buf[42]; if(buf != NULL){})
This makes arrays non-null in valueflow, so it can catch comparisons against null that is always true:

```cpp
void f(void) {
   int buf[42];
   if( buf != 0) {;} // << always true
}
```
2018-12-17 06:07:34 +01:00
Paul Fultz II 3262a3bebe Add isSameExpression to valueflow analysis
Check for same expressions in valueflow analysis.
2018-12-16 07:35:27 +01:00
Paul Fultz II 45dcfad9f9 Fix issue 8899: False positive returnDanglingLifetime when returning by value
This fixes the FP from:

```cpp
#include <string>

class MyString
{
        public:
        MyString(char* source)
        {
                length = strlen( source );
                buffer = new char[length+1];
                if( buffer )
                {
                        strcpy( buffer, source );
                }
        }

        char* buffer;
        int length;
};

MyString Foo()
{
        char arr[20];
        sprintf(arr, "hello world");

        return arr;
}

void main()
{
        MyString str = Foo();

        printf(str.buffer);
}
```
2018-12-15 17:58:45 +01:00
Daniel Marjamäki 88c61e8d1e ValueFlow: Avoid FP when lambda is used 2018-12-04 18:54:26 +01:00
Daniel Marjamäki f5a94ed300 ValueFlow: Fix FP when lambda is called 2018-12-04 18:46:00 +01:00
Igor 61878c5e11 Add null pointer check to fix SEGFAULT (#1499)
* Add null pointer check to fix segfault

* Add first test case to reproduce problem
2018-12-02 14:36:01 +01:00
Paul Fultz II 3e1b34dd8f Fix FPs and crashes with byDerefCopy (#1503)
* Fix FP when inserting a range into a container

* Formatting

* Fix crash
2018-12-02 14:31:31 +01:00
Paul Fultz II b841b818d2 Fix 8872: Crash in LifetimeStore when there is no scope for variable
This fixes crash in:

```cpp
struct edit_line_paste_over {
    void operator()(agi::Context *c) override {
        paste_lines(c, true, [&](AssDialogue *new_line) -> AssDialogue * {
            AssDialogue *ret = paste_over(c->parent, pasteOverOptions, new_line, static_cast<AssDialogue*>(&*pos));
            return ret;
          });
    }
};
```
2018-12-01 19:11:26 +01:00
Paul Fultz II 67dd822910 Fix FP in lifetime anlaysis: Dont decay std array
This will fix FP with:

```cpp
std::array<char, 1> f() {
    std::array<char, 1> x;
    return x;
}
```
2018-12-01 19:09:19 +01:00
Daniel Marjamäki 0ad757fc78 valueFlowLifetime: Try to cleanup the loop a little. No functional change is intended. 2018-11-27 06:43:59 +01:00
Paul Fultz II 5a6f9ac82a Fix FP with strcmp and terminating conditions 2018-11-27 06:39:29 +01:00
Daniel Marjamäki 2887ee10c0 Fixed #8800 (Possible variable assignment ignored in boolean expression) 2018-11-26 14:00:03 +01:00
Paul Fultz II a3921ea861 Refactor valueFlowAfterCondition
So this unifies the `valueFlowAfterCondition` so it re-uses more code between checking for integers and container sizes. This should make valueFlowContainer more robust.

It also extends valueflow to support container comparisons such as `if (v.size() < 3)` or `if (v.size() > 3)` using the same mechanism that is used for integers.
2018-11-24 10:07:12 +01:00
Daniel Marjamäki 52f9650533 Refactoring: Use visitAstNodes 2018-11-23 19:16:19 +01:00
Daniel Marjamäki 745b58de26 Refactoring: Use visitAstNodes 2018-11-23 17:18:07 +01:00
Paul Fultz II f16d9d7d90 Issue 6175: Check lifetime of a variables stored in containers and member variables
Cppcheck will now warn for all cases here:

```cpp
#include <vector>
class CCluster {};
class MyClass
{ public:
    std::vector<CCluster*> m_cluster;
    void createCluster()
    {
        CCluster cl;
        CCluster* pcl=&cl;
        m_cluster.push_back(pcl);
    }
    void createCluster2()
    {
        CCluster cl;
        m_cluster.push_back(&cl);
    }
    CCluster* Cluster()
    {
        CCluster cl;
        CCluster* pcl=&cl;
        return pcl;
    }
    CCluster* Cluster2()
    {
        CCluster cl;
        return &cl;
    }
};

```
2018-11-21 08:43:57 +01:00
Daniel Marjamäki 9d8e5e36eb Added a few TODO comments 2018-11-20 22:57:01 +01:00
Paul Fultz II 7ef119cbfc Fix FPs in lifetime checker
This fixes several FPs in the lifetime checker. It also fixes issue [8846](https://trac.cppcheck.net/ticket/8846):

```cpp
int * f(int a[])
{
        return a;
}
```
2018-11-17 09:41:59 +01:00
Paul Fultz II d376e9f245 Track variable lifetime through function calls (#1481) 2018-11-16 06:12:28 +01:00
Daniel Marjamäki 39c04b650d astyle formatting
[ci skip]
2018-11-14 19:10:52 +01:00
Paul Fultz II 54453c5802 Fix FP when copying pointer to string (#1479) 2018-11-14 06:59:25 +01:00
Paul Fultz II f0c86b9d14 Fix issue 8842: Crash in valueFlowTerminatingCondition on incomplete code (#1480) 2018-11-14 06:23:45 +01:00
Daniel Marjamäki f096d7f474 astyle formatting
[ci skip]
2018-11-12 10:08:57 +01:00
Paul Fultz II 0e11bb07c8 Extend lifetime analysis to pointer usage (#1477)
* Use lifetime analysis for pointers as well

* Fix issue 1143: Pointer to local array

* Update message when using pointers

* Avoid infinite loop in tracing lifetimes
2018-11-12 10:08:17 +01:00
Daniel Marjamäki 717a2d370c astyle formatting
[ci skip]
2018-11-12 06:32:02 +01:00
Paul Fultz II 5bda102897 Fix warnings (#1476) 2018-11-12 06:08:57 +01:00
Paul Fultz II 68d6b96878 Diagnose invalid lifetimes (#1475)
* Add check for invalid lifetimes

* Fix FP with member variables

* Dont forward lifetime values in subfunction

* Update message to use out of scope
2018-11-11 16:43:54 +01:00
Daniel Marjamäki bdd4623124 valueFlowLibraryFunction: fix crash found with daca@home 2018-11-11 16:41:01 +01:00
Paul Fultz II e46691597e Fix issue 8841: FP knownConditionTrueFalse - Dont treat unknown function as noreturn (#1474)
* Fix issue 8841: Dont treat unknown function as noreturn

* Add a parameter to set default value when the function is unknown
2018-11-11 08:04:01 +01:00
Daniel Marjamäki d5a478d5c5 astyle formatting
[ci skip]
2018-11-10 21:30:01 +01:00
Paul Fultz II 1ffcc6b730 Add initial lifetime checker (#1448)
* Inital valueflow lifetime checker

* Forward values

* Add initial tests

* Fix deplicate messages

* Fix traversing nested lambdas

* Turn test case into a todo

* Skip if returning a container

* Fix FP when using references

* Add missing header

* Fix FP from broken scopes

* Fix FP with static variable

* Add test for more FPs

* Parse lambda functions

* Check for capture by value

* Add tests for using a container and lambda together

* Fix cppcheck errors

* Add test for nextAfterAstRightmostLeaf

* Add valueflow tests

* Update error message

* Check for correct lambda token

* Improve error path reporting

* Fix hang when parsing arrays that look almlost like lambdas
2018-11-10 16:40:40 +01:00
Paul Fultz II 36e663e250 Fix issue 8839: FP knownConditionTrueFalse - condition inside a while-clause (#1469) 2018-11-09 06:09:51 +01:00
Paul Fultz II 7373be2bfa Add a pass in valueflow for terminating conditions (#1323)
* Add valueflow for terminating conditions

* Add valueflow test

* Dont check for same expressions for now to avoid double diagnostics

* Check nesting

* Add more tests

* Ensure conditions happen in order

* Check for null

* Add error path

* Support same expression check as well

* Use early continue

* Skip checking the same token

* Avoid double condtion diagnosis

* Fix FP when in switch statements

* Fix FP when time function

* Skip conditional escapes

* Use simpleMatch

* Fix naming

* Fix typo
2018-11-07 06:49:07 +01:00
Daniel Marjamäki 35d18be311 ValueFlow: Refactoring, removed redundant assignment 2018-11-06 07:02:20 +01:00
Daniel Marjamäki 00340efc57 ValueFlow: Refactoring valueFlowCallFunction 2018-11-06 06:38:26 +01:00
Daniel Marjamäki ca19894a04 ValueFlow: In evaluate handle correlated values 2018-11-05 18:07:35 +01:00
Daniel Marjamäki da44ce0b5d ValueFlow: evaluate strlen and char literals better 2018-11-05 16:52:12 +01:00
Daniel Marjamäki 977fdd88a9 ValueFlow: Fix a few issues in 'evaluate' 2018-11-05 06:53:48 +01:00
Daniel Marjamäki 8a54420274 ValueFlow: Try to handle multiple argument values in <returnValue> evaluation 2018-11-04 20:52:12 +01:00
Daniel Marjamäki dd9a1e890b valueFlowRightShift: Do not perform analysis when rhs is negative 2018-11-04 17:13:23 +01:00
Daniel Marjamäki 6878de2c5e ValueFlow: getExpressionRange, valueFlowRightShift 2018-11-03 23:25:46 +01:00
Daniel Marjamäki ef35b86b4a Multipass Valueflow 2018-11-03 15:53:24 +01:00
Daniel Marjamäki 614a252704 Fix Match warning 2018-11-02 20:14:34 +01:00
Daniel Marjamäki 5de683ec49 Container size: Fix false positive 2018-11-02 20:10:40 +01:00
Daniel Marjamäki 16cc20a232 ValueFlow: Better handling of container size values 2018-11-02 18:28:32 +01:00
Daniel Marjamäki c03d32b429 ValueFlow: Improve containerSize handling of string like classes 2018-10-28 19:14:00 +01:00
Daniel Marjamäki 06ede9c239 ValueFlow: handle x+=y for containers 2018-10-27 18:38:04 +02:00
Paul Fultz II 16c62281d0 Use followVar in checking duplicateBranch (#1423)
* Use isSameExpression for duplicate branches

* Add errorPath

* Add another test
2018-10-18 11:56:23 +02:00
Paul Fultz II f65cf220ba Fix false positives in unknownEvaluationOrder when using followVar (#1391)
Fix false positives in unknownEvaluationOrder when using followVar
2018-09-28 08:38:24 +02:00
orbitcowboy d08b39c915
Improved const correctness of local variables. There are no functional changes intended. (#1392) 2018-09-23 20:24:51 +02:00
Daniel Marjamäki d7de46f50e ValueFlow: Fix false positive for container size 2018-09-08 10:43:08 +02:00
Daniel Marjamäki c6d43506b6 ValueFlow: Fix FP in switch 2018-09-04 20:28:48 +02:00
Daniel Marjamäki cc402869a6 Fixed #8689 (False positive: containerOutOfBounds after function call) 2018-09-02 14:08:34 +02:00
Daniel Marjamäki 6223204a06 Fixed #8708 (FP: Accessing an item in container that is empty) 2018-08-27 13:49:47 +02:00
Daniel Marjamäki 2f834c3c3b Fixed #8688 (False positive: containerOutOfBounds) 2018-08-13 21:27:29 +02:00
Daniel Marjamäki 55ab842083 valueFlowSizeForward: Bailout when function calls modify the container size 2018-08-13 06:54:18 +02:00
Daniel Marjamäki 183345a939 valueFlowContainerSize: Fix FP when container size is changed 2018-08-12 22:23:19 +02:00
Daniel Marjamäki 7074eeb869 valueFlowContainerSize: assignment of string-like containers 2018-08-12 22:01:58 +02:00
Daniel Marjamäki 189ea5003a valueFlowContainerSize: empty container variables 2018-08-12 14:41:00 +02:00
Daniel Marjamäki 811a71aa06 valueFlowContainerSize: Handle guard logic 2018-08-11 15:08:54 +02:00
Daniel Marjamäki 6008bbdfb4 valueFlowContainerSize: Fix wrong value after condition if conditional code escapes 2018-08-11 13:49:42 +02:00
Daniel Marjamäki 10461e5429 valueFlowContainerSize: forward analysis inside conditional code 2018-08-10 22:18:38 +02:00
Daniel Marjamäki 4a502a7f6b valueFlowContainerSize: add simple forward analysis 2018-08-10 22:06:23 +02:00
Daniel Marjamäki 2b10e38eec valueFlowContainerSize: handling of 'v.size() == 10' 2018-08-10 21:43:47 +02:00
Paul Fultz II 3947c23290 Fix issue 8369: False negative: Condition 'condition' is always true (#1325)
* Fix issue 8369: False negative: Condition 'condition' is always true

* Use simpleMatch

* Add iterator header

* Cleanup

* Remove unused variable
2018-08-10 18:05:23 +02:00
Daniel Marjamäki 3805af18a2 valueFlowContainerSize: Fix crash when container pointer is null 2018-08-10 12:53:16 +02:00
Daniel Marjamäki f37434cd1d valueFlowContainerReverse: Fix FPs when there is assignment 2018-08-10 12:26:53 +02:00
Daniel Marjamäki 907f81d059 ValueFlow: Improved analysis of container size 2018-08-10 11:53:56 +02:00
Daniel Marjamäki 81f54f7094 Fixed #8681 (ValueFlow: Container size) 2018-08-10 11:29:16 +02:00
Daniel Marjamäki c666f74755 astyle formatting
[ci skip]
2018-07-25 23:02:16 +02:00
Paul Fultz II f093692551 ValueFlow: Set values in else branch even when the first branch modifies the value (#1309)
* Set values in else branch even when the first branch modifies the value

* Move tests

* Add check for goto

* Remvoe todo

* Also check scope is noreturn

* Use isEscapeScope when variables are changed
2018-07-25 22:59:54 +02:00
Paul Fultz II 9895ea5ff2 Fix issue 470: Condition is always true or false on logical operators (#1294)
* Fix issue 470: Condition is always true or false on logical operators

* Dont warn on literals

* Compute logical operators using valueflow

* Fix FP when using literals

* Always warn on subconditions that are always true

* Use percent matches first

* Add test for logical operators

* Check if parent is null
2018-07-23 08:51:59 +02:00
Daniel Marjamäki 991300ac54 Clarify code with Token::isUnaryOp() 2018-07-14 22:36:08 +02:00
Daniel Marjamäki 1e824330c0 Refactoring: Use range for loops 2018-07-14 22:26:22 +02:00
Daniel Marjamäki 0f3cc56c59 Refactoring: Use range for loops 2018-07-14 13:19:41 +02:00
Daniel Marjamäki d603a811bb Clarify code with Token::hasKnownValue() 2018-07-14 13:09:53 +02:00
orbitcowboy de66eedd54 Improved const correctness of local variables. 2018-05-29 17:33:43 +02:00
Daniel Marjamäki 8e8919e906 Fix comment 2018-05-07 22:06:23 +02:00
Daniel Marjamäki 8c2a5c9813 astyle formatting
[ci skip]
2018-05-06 09:50:53 +02:00
Paul Fultz II 0561877182 Fix false positive with negative array index in issue 8536 (#1202)
* Fix FP with negative array index in valueflow

* Remove values when valueflow fails

* Add valueflow test
2018-05-06 08:35:29 +02:00
Daniel Marjamäki 858e055c0e ValueFlow: Wrote a few basic comments 2018-05-05 23:03:04 +02:00
Daniel Marjamäki f336c2efe7 Refactoring; Renamed Scope::classStart and Scope::classEnd 2018-04-27 22:36:30 +02:00
Daniel Marjamäki dbcdb19b73 Refactoring; Use range for 2018-04-24 18:02:36 +02:00
Daniel Marjamäki 7ee636b934 Refactoring: Reuse isLikelyStreamRead in isVariableChanged 2018-04-18 17:46:10 +02:00
Daniel Marjamäki 7825eb8670 Refactoring; reuse isLikelyStreamRead 2018-04-17 19:51:27 +02:00
Daniel Marjamäki c84628c28a Fixed #8494 (False positive: serialization class overloads operator) 2018-04-17 14:23:04 +02:00
PKEuS d2146844dd Refactorizations:
- Replace several push_back-calls by emplace_back
- Replace some x = x.substr(0, y) calls by x.erase(y)
2018-04-11 09:44:35 +02:00
Daniel Marjamäki c5923fbdd3 astyle formatting 2018-04-09 22:21:17 +02:00
Paul Fultz II d8b3fa5c70 Fix #8482: Regression with valueflow (#1159)
* Fix regression with valueflow

* Simplify test case
2018-04-09 16:13:17 +02:00
PKEuS b15cc3f236 Refactorization: Replace several push_back-sequences by initializer lists 2018-04-09 09:54:39 +02:00
Daniel Marjamäki ee5c60e8f6 Refactoring, use early continue 2018-04-08 09:30:13 +02:00
Daniel Marjamäki 795b9f5e0f astyle formatting 2018-04-08 09:25:59 +02:00
Paul Fultz II aed84abfd5 Extend valueflow comparison ops (#1153)
* Handle else clause when doing a compare

* Break early

* Fix bug in checking no return else

* Escape quotes

* Add equal sign

* Simplify the logic
2018-04-08 09:24:01 +02:00
Matthias Krüger 5a104cab6e remove weird "#line 2" from valueflow.cpp 2018-04-06 23:26:08 +02:00
Daniel Marjamäki 3ad6c7ebce Refactoring, use early continue 2018-04-05 08:21:43 +02:00
Paul Fultz II b871c85b67 Improve valeflow analysis with comparison operators (#1131)
* Improve valeflow analysis with comparison operators

* Use simple match

* Dont add 0 on comparisons

* Check reverse comparisons

* Use nullptr

* Remove duplicate code tests
2018-04-05 06:51:31 +02:00
jrp2014 b6504c70ca Improve constness 2018-04-04 21:51:31 +02:00
IOBYTE 5bc039b7da Fix #6367 and #8439 (improve sizeof value flow support) (#1132) 2018-03-23 08:28:12 +01:00
Daniel Marjamäki 7699f6432b Fixed #8288 (valueFlowGlobalVar: compound assignments) 2018-03-18 19:53:33 +01:00
Daniel Marjamäki ec6133aea2 Fixed #8182 (False positive uninitvar - variable initialized in function in ternary expression) 2018-03-16 19:13:48 +01:00
Daniel Marjamäki 1628405869 Fix internal warning 2018-02-24 22:35:37 +01:00
Daniel Marjamäki 7701e4594a ValueFlowBeforeCondition: Fix wrong value in do-while condition when there is a break in the loop body 2018-02-24 22:07:34 +01:00
Daniel Marjamäki 69b50b274c Try to make Travis happy 2018-02-11 22:54:14 +01:00
Daniel Marjamäki e62b9bdc77 Fixed #8348 (ValueFlow: wrong Uninit value with abort() in else-branch) 2018-02-11 22:14:44 +01:00
Matthias Krüger f009cfc845 fix some typos found by codespell. 2018-02-04 20:53:43 +01:00
Daniel Marjamäki c4caee6b18 Updated copyright year 2018-01-14 15:37:52 +01:00
Daniel Marjamäki 6fd157e93b ValueFlow: Template arguments have 'possible' values 2018-01-11 14:22:27 +01:00
PKEuS c8010fdf42 Fixed crash on garbage code (#8307) 2018-01-07 13:11:56 +01:00
Daniel Marjamäki 8fe4852b98 Refactoring, reuse and improve isVariableChangedByFunction() 2017-11-18 11:02:52 +01:00
Daniel Marjamäki 9191e6f112 Fixed #8246 (ValueFlow: known value, function pointer argument) 2017-11-17 23:04:54 +01:00
Daniel Marjamäki 4a9984d73b Fixed #8233 (FP uninitvar found in bash:lib/readline/display.c) 2017-11-06 10:28:07 +01:00
Ayaz Salikhov 19af9bc216 Fix UB when converting float to int (#984) 2017-11-03 14:05:23 +01:00
Daniel Marjamäki 002f6679d5 Fix syntax error 2017-10-21 22:17:07 +02:00
Daniel Marjamäki c4c76aa1ad Use MathLib::bigint_bits 2017-10-21 22:08:34 +02:00
Ayaz Salikhov 64e61d28ba Add an ability to use address sanitizer (#979) 2017-10-21 21:04:14 +02:00
Daniel Marjamäki 05e1e5e0a0 astyle formatting
[ci skip]
2017-10-20 22:11:12 +02:00
Daniel Marjamäki 1d5e3e4f0c Fixed #8247 (False positive knownConditionTrueFalse) 2017-10-20 17:31:58 +02:00
Dmitry-Me 5040491ee6 Size computation code not required outside this translation unit 2017-10-19 19:01:41 +03:00
Dmitry-Me 606e28a3c5 Extract and reuse size computation 2017-10-19 00:25:21 +03:00
Dmitry-Me 34a8d2431f Extract and reuse size computation 2017-10-19 00:20:04 +03:00
Dmitry-Me 8709490903 Clarify expressions with parentheses 2017-10-18 23:40:43 +03:00
Dmitry-Me e356ccca22 Revert "Clarify expression with parentheses"
This reverts commit bbf0a81c2d.
2017-10-18 23:31:44 +03:00
Dmitry-Me bbf0a81c2d Clarify expression with parentheses 2017-10-18 23:24:31 +03:00
Dmitry-Me 151ace2581 Use Platform for char limits computation (#972) 2017-10-18 17:30:47 +02:00
Daniel Marjamäki ad1749738e Fixed #6153 (ValueFlowBeforeCondition: Handle global variables) 2017-10-17 16:55:37 +02:00
Daniel Marjamäki 6d59290858 Fixed #10 (ValueFlow: condition variable has known value in switch case) 2017-10-16 21:51:30 +02:00
Daniel Marjamäki fbccb3ae55 Add errorpath for accessMoved message 2017-10-10 15:49:15 +02:00
Daniel Marjamäki d3c9d06aa4 astyle formatting
[ci skip]
2017-10-08 14:16:45 +02:00
Ayaz Salikhov be2c65eb58 Simplify int vs bool 2017-10-08 07:54:39 +02:00
Daniel Marjamäki 2a6fbe2e3c astyle formatting
[ci skip]
2017-10-05 23:01:42 +02:00
hexcoder 051a18b120 pull request for ticket 8180 (better diagnostic output for bailouts) (#964)
* sync build instructions from readme.txt

* refactored the patch from ticket 8180. Moved logic from macros to the bailoutInternal function

* adapt to new bailout message format

* adapt to new bailout message format

* adapt to new bailout message format

* compile fix for Microsoft platform

* remove directory part from file locations in bailout message (normalize)

* remove directory part from valueflow message filter

* adapt tests to file format without directory part

* adapt tests to file format without directory part

* new line number agnostic assert_equals methods

* new line number agnostic assert_equals methods

* adapt to new method assertEqualsWithoutLineNumbers()

* adapt to new method assertEqualsWithoutLineNumbers()

* Bugfix: do not replace line number with spaces, remove it

* review changes: const char * -> std::string, size_t -> int, std::to_string() -> MathLib::toString()

* set #line at the beginning to guard against insertions from match compiler

* Bugfix: counting lines can be difficult :-) #line 1 -> #line 2

* added method stripDirectoryPart()

* added method stripDirectoryPart()

* used new method Path::stripDirectoryPart()

* new dependency path.h in lib/valueFlow.cpp

* code cleanup, removing redundant temporary objects and casts
2017-10-05 23:03:13 +02:00
Daniel Marjamäki ba8222de1c ValueFlow: Put 'inconclusive' state in the ValueKind. A value can't be both known and inconclusive. 2017-09-20 22:41:36 +02:00
Daniel Marjamäki 87c35cd60e ValueFlowForward: Refactoring handling of compound assignments 2017-09-20 11:45:28 +02:00
Daniel Marjamäki 1dbcba4dd6 Fixed #8221 (ValueFlow: value for static variable that is not written) 2017-09-15 15:58:19 +02:00
Daniel Marjamäki ef1f3fbee6 Fixed #8173 (ValueFlow: use AST when setting values in assignment RHS ((n=42) && n=='A')) 2017-09-14 22:49:47 +02:00
Dmitry-Me a4c20b3606 Break loop early 2017-09-12 07:48:06 +03:00
Dmitry-Me 4126fab1d5 Simplify code with temporary 2017-09-12 07:46:38 +03:00
Dmitry-Me caebf137bc Cache and reuse value 2017-09-12 00:21:36 +03:00
Dmitry-Me 5dba8268e7 Better variable name 2017-09-04 17:53:56 +03:00
Daniel Marjamäki a02fd54a69 ValueFlow: Avoid FPs for aliased variables 2017-09-03 23:24:55 +02:00
Dmitry-Me beba46987d Remove redundant variable 2017-09-01 18:19:25 +03:00
Dmitry-Me 2133350bf0 More useful default value 2017-09-01 18:17:40 +03:00
Dmitry-Me 4663dc205a Cache and reuse value 2017-09-01 18:16:08 +03:00
Daniel Marjamäki 59034e17f1 Refactoring, reuse code to skip lambda functions 2017-08-29 22:35:55 +02:00
Daniel Marjamäki 9c99bc43c2 ValueFlow: Skip wrong handling of lambda functions. TODO: handle lambda functions properly. 2017-08-28 22:39:12 +02:00
Daniel Marjamäki 02a1b7cd2d Fixed #7965 (valueFlowForward: Improved handling of correlated variables) 2017-08-27 19:50:44 +02:00
Daniel Marjamäki 529b255e99 ValueFlow: Better errorpath for increment/decrement 2017-08-25 23:07:26 +02:00
Daniel Marjamäki b1b8e5270a ValueFlow: Better errorpath for increment/decrement 2017-08-25 22:15:52 +02:00
Daniel Marjamäki 50636f75ba ValueFlow: Improved error path for compound assignments 2017-08-24 22:02:49 +02:00