Commit Graph

477 Commits

Author SHA1 Message Date
Paul Fultz II 857722f859
Fix issue 9711: FP knownConditionTrueFalse for variable modified via pointer (#2813) 2020-09-20 14:27:09 +02:00
Paul Fultz II a42976d656
Fix issue 9898: false positive: knownConditionTrueFalse (#2806) 2020-09-14 18:43:11 +02:00
Paul Fultz II bb7164171c
Fix issue 9894: ValueFlow: wrong known value below while with assignment (#2804)
* Fix issue 9894: ValueFlow: wrong known value below while with assignment
2020-09-14 08:03:25 +02:00
Paul be900873cc FIx issue 9895: ValueFlow: Wrong known value below function call with reference parameter 2020-09-11 16:03:57 -05:00
Daniel Marjamäki 600538a325
Merge pull request #2793 from Ken-Patrick/mixedoperators
Fix false positives with condition with || and &&
2020-09-11 10:11:31 +02:00
Paul 4d1b3e06c7 Fix FPs 2020-09-10 17:06:49 -05:00
Ken-Patrick Lehrmann a114bf0293 Fix false positives with condition with || and &&
The value of something in the middle of a condition with mixed || and &&
gives no information on which branch will be taken.
For instance with:
```
int f(int a, int b, bool x) {\n"
  if (a == 1 && (!(b == 2 && x))) {
  } else {
    if (x) {
    }
  }

  return 0;
}
```
We can enter the if part whether x is true or false, and similarly,
enter the else part whether x is true or false. Same thing with the
value of b.

This fixes the following false positive with above code:
```
:4:13: style: Condition 'x' is always true [knownConditionTrueFalse]
        if (x) {
            ^
:2:33: note: Assuming that condition 'x' is not redundant
    if (a == 6 && (!(b == 21 && x))) {
                                ^

```
2020-09-10 23:27:39 +02:00
Daniel Marjamäki 18e99176e5
Fix issue 9883: endless recursion in getLifetimeTokens (#2786) 2020-09-08 20:14:54 +02:00
Paul Fultz II 5099ca3c8b
Fix issue 9882: segfault in ForwardTraversal (#2785) 2020-09-08 20:14:10 +02:00
Paul d5489fd1f0 Fix issue 9883: endless recursion in getLifetimeTokens 2020-09-08 11:33:29 -05:00
Paul Fultz II ec89c57a90
Fix issue 9849: false positive: containerOutOfBounds (#2753) 2020-08-25 07:12:41 +02:00
Daniel Marjamäki 2bb73840fc astyle formatting 2020-08-23 17:17:33 +02:00
Paul Fultz II ac846b96d1
New check: Iterating a known empty container (#2740) 2020-08-22 09:16:26 +02:00
Paul 71c228a01a Check for containers that modify the size using square bracket 2020-08-10 22:07:22 -05:00
Paul fec2914700 Add tests for container changes 2020-08-09 22:52:03 -05:00
Paul 26693df788 Use forward analyzer for container forward 2020-08-08 00:10:03 -05:00
Ken-Patrick LEHRMANN a923115710 Add missing operators <<= and >>=
This fixes issues (at least false positives) in code using them.
For instance:

```
unsigned compute(unsigned long long a) {
    unsigned num = 0;
    while (a > 0xFFFFFFFF) {
      a >>= 32;
      num += 32;
    }
    if (a > 0xFFFF) {
      a >>= 16;
      num += 16;
    }
    if (a > 0xFF) {
      num += 8;
    }
    return num;
}
```

would give false positive:
```
cppcheck --enable=style  sl3.cpp
Checking sl3.cpp ...
sl3.cpp:11:11: style: Condition 'a>0xFF' is always false [knownConditionTrueFalse]
    if (a > 0xFF) {
          ^
sl3.cpp:3:14: note: Assuming that condition 'a>0xFFFFFFFF' is not redundant
    while (a > 0xFFFFFFFF) {
             ^
sl3.cpp:11:11: note: Condition 'a>0xFF' is always false
    if (a > 0xFF) {
          ^
```
2020-07-23 14:36:34 +02:00
Ken-Patrick Lehrmann 5a3789a23f 9769: Improve value flow for ternary operator
In some cases, the condition of the ternary operator is assigned a known
value after the two possible results, and in such cases, we would not
take the opportunity to assign a value to the ternary operator (and to
the other parents in the ast).
This patch adds this capability.
2020-06-20 10:29:28 +02:00
Daniel Marjamäki 2b0e4926bc valueFlowAfterAssign: variable initialization 2020-06-14 21:14:05 +02:00
Paul Fultz II 0c659a1499
Fix incorrect logic for condition (#2675) 2020-06-09 08:16:53 +02:00
Daniel Marjamäki 6d796b434e Fixed #9731 (ValueFlow: does not handle many assignments well) 2020-06-08 21:17:12 +02:00
Paul Fultz II eed2e829a7
Revert "Cleanup: Removed Tokenizer::simplifyTokenList2. As a side-effect, rules for "simple" token list are now executed on normal token list." (#2666)
This reverts commit 187cde183d.
2020-05-30 11:23:22 +02:00
PKEuS 187cde183d Cleanup: Removed Tokenizer::simplifyTokenList2. As a side-effect, rules for "simple" token list are now executed on normal token list. 2020-05-29 21:21:07 +02:00
Daniel Marjamäki d64631219b Fixed #9741 (Wrong value for sizeof) 2020-05-28 21:24:48 +02:00
Oliver Stöneberg 4f68d85633
optimized non-matchcompiled Token::simpleMatch() a bit (#2640) 2020-05-26 20:13:56 +02:00
Paul Fultz II 526abd4b52
Fix issue 9738: ValueFlow: handle std::tie better (#2657) 2020-05-22 22:57:20 +02:00
Paul Fultz II 8301fa8244
Fix issue 8144: valueFlowBeforeCondition: struct (#2645) 2020-05-21 08:47:48 +02:00
orbitcowboy 9861a5291e Formatted the code, there are no functional changes [ci skip] 2020-05-20 23:45:00 +02:00
PKEuS fb1afe2345 Fixed test suite: Do no longer apply simplifyTokenList2 to token lists, except for those tests that test those simplifications, because checks are no longer run on that simplified token list
Changed failing unit test to TODO tests, as they indicate patterns we do no longer understand properly.
2020-05-20 18:54:16 +02:00
PKEuS c9d8f607df Optimization: Reduced peak memory usage (30% in my test case) by immediately deleting simplecpp::TokenList while creating the cppcheck TokenList. 2020-05-19 12:08:17 +02:00
PKEuS 793ed68029 Refactorization: Moved code from header to source
- from utils.h to new utils.cpp
- from token.h to token.cpp
- from valueflow.h to valueflow.cpp
- from errorlogger.h to errorlogger.cpp
2020-05-19 08:35:12 +02:00
Daniel Marjamäki 08ddd84780 Update copyright year 2020-05-10 11:16:32 +02:00
Daniel Marjamäki 3e0218299b Revert "Update copyright year"
This reverts commit 6eec6c4bd5.
2020-05-10 11:13:05 +02:00
Daniel Marjamäki 6eec6c4bd5 Update copyright year 2020-05-10 11:11:34 +02:00
Paul Fultz II 2a09465a07
Fix issue 9686: Regression: ValueFlow should handle try/catch better (#2618) 2020-04-22 19:20:03 +02:00
Oliver Stöneberg 1af959af2c
fixed -Wextra-semi-stmt Clang warnings (#2553)
* fixed -Wextra-semi-stmt Clang warnings

* adjusted REDIRECT macro to require a semicolon

* testmathlib.cpp: rolled back accidental change
2020-04-21 17:27:51 +02:00
Daniel Marjamäki e8bbfdbfee Fixed #9559 (Multiple checks to std::atomic are not redundant) 2020-04-19 17:29:40 +02:00
Paul Fultz II e2efb338b6
Fix issue 9678: False positive: generic valueflow forward analysis (#2611) 2020-04-19 08:28:07 +02:00
Paul Fultz II 8b27f1c216
Fix issue 9667: crash: crash in valueflow for weird code where label address is returned (#2602) 2020-04-11 13:56:53 +02:00
Paul Fultz II 6cc58e1086
Set a max for the combination of arguments that can be passsed through valueFlowSubFunction (#2579)
* Set a max for the combination of arguments that can be passsed

* Skip mismatch path ids when computing the cross product
2020-04-01 22:33:09 +02:00
Paul Fultz II b68d6f9471
Fix crash in valueflow when using local classes (#2575) 2020-03-22 10:12:53 +01:00
Paul Fultz II 7fd3580f21
Dont traverse conditions multiple times (#2574) 2020-03-20 10:37:16 +01:00
Paul Fultz II f2527f5340
Fix crash in valueFlowForLoopSimplifyAfter (#2573) 2020-03-20 07:16:05 +01:00
Rikard Falkeborn f6e7fb4bd9
Bugfix valuetype for some integer constants (#2545) 2020-02-19 07:51:39 +01:00
Paul Fultz II 921887a281
Use valueFlowGeneric for valueFlowForwardExpression (#2537) 2020-02-16 16:02:22 +01:00
Paul Fultz II 61d847cac2
Fix issue 9637: false positive: Condition 'i<2U' is always true (#2536) 2020-02-15 07:57:43 +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
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
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