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We really ought to support no_sanitize("coverage") in line with other sanitizers. This came up again in discussions on the Linux-kernel mailing lists, because we currently do workarounds using objtool to remove coverage instrumentation. Since that support is only on x86, to continue support coverage instrumentation on other architectures, we must support selectively disabling coverage instrumentation via function attributes. Unfortunately, for SanitizeCoverage, it has not been implemented as a sanitizer via fsanitize= and associated options in Sanitizers.def, but rolls its own option fsanitize-coverage. This meant that we never got "automatic" no_sanitize attribute support. Implement no_sanitize attribute support by special-casing the string "coverage" in the NoSanitizeAttr implementation. To keep the feature as unintrusive to existing IR generation as possible, define a new negative function attribute NoSanitizeCoverage to propagate the information through to the instrumentation pass. Fixes: https://bugs.llvm.org/show_bug.cgi?id=49035 Reviewed By: vitalybuka, morehouse Differential Revision: https://reviews.llvm.org/D102772 |
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