forked from OSchip/llvm-project
54 lines
2.7 KiB
C++
54 lines
2.7 KiB
C++
//===-- options.inc ---------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef GWP_ASAN_OPTION
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#error "Define GWP_ASAN_OPTION prior to including this file!"
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#endif
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GWP_ASAN_OPTION(bool, Enabled, true, "Is GWP-ASan enabled? Defaults to true.")
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GWP_ASAN_OPTION(
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bool, PerfectlyRightAlign, false,
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"When allocations are right-aligned, should we perfectly align them up to "
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"the page boundary? By default (false), we round up allocation size to the "
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"nearest power of two (1, 2, 4, 8, 16) up to a maximum of 16-byte "
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"alignment for performance reasons. For Bionic, we use 8-byte alignment by "
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"default. Setting this to true can find single byte buffer-overflows for "
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"multibyte allocations at the cost of performance, and may be incompatible "
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"with some architectures.")
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GWP_ASAN_OPTION(int, MaxSimultaneousAllocations, 16,
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"Number of simultaneously-guarded allocations available in the "
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"pool. Defaults to 16.")
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GWP_ASAN_OPTION(int, SampleRate, 5000,
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"The probability (1 / SampleRate) that an allocation is "
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"selected for GWP-ASan sampling. Default is 5000. Sample rates "
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"up to (2^31 - 1) are supported.")
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// Developer note - This option is not actually processed by GWP-ASan itself. It
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// is included here so that a user can specify whether they want signal handlers
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// or not. The supporting allocator should inspect this value to see whether
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// signal handlers need to be installed, and then use
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// crash_handler::installSignalHandlers() in order to install the handlers. Note
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// that in order to support signal handlers, you will need to link against the
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// optional crash_handler component.
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GWP_ASAN_OPTION(
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bool, InstallSignalHandlers, true,
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"Install GWP-ASan signal handlers for SIGSEGV during dynamic loading. This "
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"allows better error reports by providing stack traces for allocation and "
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"deallocation when reporting a memory error. GWP-ASan's signal handler "
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"will forward the signal to any previously-installed handler, and user "
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"programs that install further signal handlers should make sure they do "
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"the same. Note, if the previously installed SIGSEGV handler is SIG_IGN, "
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"we terminate the process after dumping the error report.")
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GWP_ASAN_OPTION(bool, InstallForkHandlers, true,
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"Install GWP-ASan atfork handlers to acquire internal locks "
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"before fork and release them after.")
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