80 lines
2.5 KiB
ReStructuredText
80 lines
2.5 KiB
ReStructuredText
===========================
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Sanitizer special case list
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===========================
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.. contents::
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:local:
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Introduction
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============
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This document describes the way to disable or alter the behavior of
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sanitizer tools for certain source-level entities by providing a special
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file at compile-time.
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Goal and usage
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==============
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User of sanitizer tools, such as :doc:`AddressSanitizer`, :doc:`ThreadSanitizer`
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or :doc:`MemorySanitizer` may want to disable or alter some checks for
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certain source-level entities to:
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* speedup hot function, which is known to be correct;
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* ignore a function that does some low-level magic (e.g. walks through the
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thread stack, bypassing the frame boundaries);
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* ignore a known problem.
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To achieve this, user may create a file listing the entities they want to
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ignore, and pass it to clang at compile-time using
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``-fsanitize-blacklist`` flag. See :doc:`UsersManual` for details.
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Example
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=======
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.. code-block:: bash
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$ cat foo.c
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#include <stdlib.h>
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void bad_foo() {
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int *a = (int*)malloc(40);
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a[10] = 1;
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}
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int main() { bad_foo(); }
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$ cat blacklist.txt
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# Ignore reports from bad_foo function.
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fun:bad_foo
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$ clang -fsanitize=address foo.c ; ./a.out
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# AddressSanitizer prints an error report.
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$ clang -fsanitize=address -fsanitize-blacklist=blacklist.txt foo.c ; ./a.out
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# No error report here.
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Format
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======
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Each line contains an entity type, followed by a colon and a regular
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expression, specifying the names of the entities, optionally followed by
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an equals sign and a tool-specific category. Empty lines and lines starting
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with "#" are ignored. The meanining of ``*`` in regular expression for entity
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names is different - it is treated as in shell wildcarding. Two generic
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entity types are ``src`` and ``fun``, which allow user to add, respectively,
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source files and functions to special case list. Some sanitizer tools may
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introduce custom entity types - refer to tool-specific docs.
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.. code-block:: bash
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# Lines starting with # are ignored.
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# Turn off checks for the source file (use absolute path or path relative
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# to the current working directory):
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src:/path/to/source/file.c
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# Turn off checks for a particular functions (use mangled names):
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fun:MyFooBar
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fun:_Z8MyFooBarv
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# Extended regular expressions are supported:
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fun:bad_(foo|bar)
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src:bad_source[1-9].c
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# Shell like usage of * is supported (* is treated as .*):
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src:bad/sources/*
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fun:*BadFunction*
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# Specific sanitizer tools may introduce categories.
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src:/special/path/*=special_sources
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