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| author | Miguel Ojeda <ojeda@kernel.org> | 2022-12-17 02:50:08 +0100 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2022-12-20 21:42:54 +0100 |
| commit | a65ec44779ab2c01ba937b40496ca648626d0308 (patch) | |
| tree | 453e0c3915df4070434effa73f03856acec7eb92 /compiler/rustc_session/src | |
| parent | 9c07efe84f28a44f3044237696acc295aa407ee5 (diff) | |
| download | rust-a65ec44779ab2c01ba937b40496ca648626d0308.tar.gz rust-a65ec44779ab2c01ba937b40496ca648626d0308.zip | |
Add `-Zno-jump-tables`
This flag mimics GCC/Clang's `-fno-jump-tables` [1][2], which makes the codegen backend avoid generating jump tables when lowering switches. In the case of LLVM, the `"no-jump-tables"="true"` function attribute is added to every function. The kernel currently needs it for x86 when enabling IBT [3], as well as for Alpha (plus VDSO objects in MIPS/LoongArch). [1] https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#index-fno-jump-tables [2] https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fjump-tables [3] https://github.com/torvalds/linux/blob/v6.1/arch/x86/Makefile#L75-L83 Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'compiler/rustc_session/src')
| -rw-r--r-- | compiler/rustc_session/src/options.rs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs index 9e130287104..40bc669707a 100644 --- a/compiler/rustc_session/src/options.rs +++ b/compiler/rustc_session/src/options.rs @@ -1421,6 +1421,8 @@ options! { "run all passes except codegen; no output"), no_generate_arange_section: bool = (false, parse_no_flag, [TRACKED], "omit DWARF address ranges that give faster lookups"), + no_jump_tables: bool = (false, parse_no_flag, [TRACKED], + "disable the jump tables and lookup tables that can be generated from a switch case lowering"), no_leak_check: bool = (false, parse_no_flag, [UNTRACKED], "disable the 'leak check' for subtyping; unsound, but useful for tests"), no_link: bool = (false, parse_no_flag, [TRACKED], |