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codeql/change-notes/1.21/analysis-cpp.md
Geoffrey White 5bd5b1b6ce CPP: Change note.
2019-04-08 18:19:30 +01:00

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# Improvements to C/C++ analysis
## General improvements
## New queries
| **Query** | **Tags** | **Purpose** |
|-----------------------------|-----------|--------------------------------------------------------------------|
## Changes to existing queries
| **Query** | **Expected impact** | **Change** |
|----------------------------|------------------------|------------------------------------------------------------------|
| Commented-out code (`cpp/commented-out-code`) | More correct results | Commented out preprocessor code is now detected by this query. |
| Dead code due to goto or break statement (`cpp/dead-code-goto`) | Fewer false positive results | Functions containing preprocessor logic are now excluded from this analysis. |
| Mismatching new/free or malloc/delete (`cpp/new-free-mismatch`) | Fewer false positive results | Fixed an issue where functions were being identified as allocation functions inappropriately. Also affects `cpp/new-array-delete-mismatch` and `cpp/new-delete-array-mismatch`. |
| Overflow in uncontrolled allocation size (`cpp/uncontrolled-allocation-size`) | More correct results | This query has been reworked so that it can find a wider variety of results. |
| Memory may not be freed (`cpp/memory-may-not-be-freed`) | More correct results | Support added for more Microsoft-specific allocation functions, including `LocalAlloc`, `GlobalAlloc`, `HeapAlloc` and `CoTaskMemAlloc`. |
| Memory is never freed (`cpp/memory-never-freed`) | More correct results | Support added for more Microsoft-specific allocation functions, including `LocalAlloc`, `GlobalAlloc`, `HeapAlloc` and `CoTaskMemAlloc`. |
| Resource not released in destructor (`cpp/resource-not-released-in-destructor`) | Fewer false positive results | Resource allocation and deallocation functions are now determined more accurately. |
| Comparison result is always the same | Fewer false positive results | The range analysis library is now more conservative about floating point values being possibly `NaN` |
| Use of potentially dangerous function | More correct results | Calls to `localtime`, `ctime` and `asctime` are now detected by this query. |
| Wrong type of arguments to formatting function (`cpp/wrong-type-format-argument`) | More correct results and fewer false positive results | This query now more accurately identifies wide and non-wide string/character format arguments on different platforms. Platform detection has also been made more accurate for the purposes of this query. |
| Wrong type of arguments to formatting function (`cpp/wrong-type-format-argument`) | Fewer false positive results | Non-standard uses of %L are now understood. |
## Changes to QL libraries