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It detects bad memory accesses such as: reading uninitialized memory, writing in a freed zone, writing or reading outside of a memory block, and using NULL pointers. This is particularly useful for big programs with many functions.
Checker maintains bitmaps to keep track of the status of each byte
of memory. The status can be writable, readable, both, or none. When
memory is allocated, the new memory becomes write-only: you are not
allowed to read it because it has not been initialized. But when you
you write to this new block, those bytes become readable and
writable. When the block is freed, the bytes become unreadable and
unwritable. Red zones are unreadable and unwritable memory, so that
each access to a red zone produces a warning.
Obtaining
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| Bug List | <bug-checker@gnu.org> |
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| Contributors |
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| Source repository | :pserver:anoncvs@subversions.gnu.org:/cvsroot/checker http://savannah.gnu.org/cvs/?group_id=58 |
| Programs | checkergcc |
| Source languages | C |
| Supported languages | C, C++ |
| Use requirements | gcc 2.8.1 |
| Build prerequisites | gcc |
| License verified by | Janet Casey <jcasey@gnu.org> on 2001-03-01 |
| Entry compiled by | Janet Casey <jcasey@gnu.org> |
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Copyright © 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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