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| author | Alexandre Oliva <oliva@adacore.com> | 2023-06-28 01:36:53 -0300 |
|---|---|---|
| committer | Marc Poulhiès <poulhies@adacore.com> | 2023-07-10 14:41:39 +0200 |
| commit | d4d6eda9427ff4616c49092cd92e4e99f16300ed (patch) | |
| tree | a76f8d3c14fd8ff9a7339c717a9701df1d65aaf9 | |
| parent | 61736805341e4fabd1c5e0f46b15b459ad98179e (diff) | |
| download | gcc-d4d6eda9427ff4616c49092cd92e4e99f16300ed.zip gcc-d4d6eda9427ff4616c49092cd92e4e99f16300ed.tar.gz gcc-d4d6eda9427ff4616c49092cd92e4e99f16300ed.tar.bz2 | |
ada: hardcfr: optionally disable in leaf functions
Document -fhardcfr-skip-leaf.
gcc/ada/
* doc/gnat_rm/security_hardening_features.rst (Control Flow
Hardening): Document -fhardcfr-skip-leaf.
* gnat_rm.texi: Regenerate.
| -rw-r--r-- | gcc/ada/doc/gnat_rm/security_hardening_features.rst | 5 | ||||
| -rw-r--r-- | gcc/ada/gnat_rm.texi | 5 |
2 files changed, 10 insertions, 0 deletions
diff --git a/gcc/ada/doc/gnat_rm/security_hardening_features.rst b/gcc/ada/doc/gnat_rm/security_hardening_features.rst index cf8c8a2..e057af2e 100644 --- a/gcc/ada/doc/gnat_rm/security_hardening_features.rst +++ b/gcc/ada/doc/gnat_rm/security_hardening_features.rst @@ -369,6 +369,11 @@ basic blocks take note as control flows through them, and, before returning, subprograms verify that the taken notes are consistent with the control-flow graph. +The performance impact of verification on leaf subprograms can be much +higher, while the averted risks are much lower on them. +Instrumentation can be disabled for leaf subprograms with +:switch:`-fhardcfr-skip-leaf`. + Functions with too many basic blocks, or with multiple return points, call a run-time function to perform the verification. Other functions perform the verification inline before returning. diff --git a/gcc/ada/gnat_rm.texi b/gcc/ada/gnat_rm.texi index 988bb77..0d11be0 100644 --- a/gcc/ada/gnat_rm.texi +++ b/gcc/ada/gnat_rm.texi @@ -29515,6 +29515,11 @@ basic blocks take note as control flows through them, and, before returning, subprograms verify that the taken notes are consistent with the control-flow graph. +The performance impact of verification on leaf subprograms can be much +higher, while the averted risks are much lower on them. +Instrumentation can be disabled for leaf subprograms with +@code{-fhardcfr-skip-leaf}. + Functions with too many basic blocks, or with multiple return points, call a run-time function to perform the verification. Other functions perform the verification inline before returning. |