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`final[3]` is `uint8_t`. Integer conversion rank of `uint8_t` is lower than integer conversion rank of `int`, so `uint8_t` got promoted to `int`, which is signed integer type. Shift `final[3]` value left on 24, when leftmost bit is set overflows `int` and it is undefined behaviour. Before this change Undefined Behaviour Sanitizer was unhappy about it with the following message. ``` ../test/unit/hash.c:119:25: runtime error: left shift of 176 by 24 places cannot be represented in type 'int' ``` After this commit problem is gone. |
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| src | ||
| test | ||
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| autogen.sh | ||
| ChangeLog | ||
| config.stamp.in | ||
| configure.ac | ||
| COPYING | ||
| INSTALL.md | ||
| jemalloc.pc.in | ||
| Makefile.in | ||
| README | ||
| run_tests.sh | ||
| TUNING.md | ||
jemalloc is a general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. jemalloc first came into use as the FreeBSD libc allocator in 2005, and since then it has found its way into numerous applications that rely on its predictable behavior. In 2010 jemalloc development efforts broadened to include developer support features such as heap profiling and extensive monitoring/tuning hooks. Modern jemalloc releases continue to be integrated back into FreeBSD, and therefore versatility remains critical. Ongoing development efforts trend toward making jemalloc among the best allocators for a broad range of demanding applications, and eliminating/mitigating weaknesses that have practical repercussions for real world applications. The COPYING file contains copyright and licensing information. The INSTALL file contains information on how to configure, build, and install jemalloc. The ChangeLog file contains a brief summary of changes for each release. URL: https://jemalloc.net/