Add a preprocessor definitions to indidcate the landing pad labeling … #76
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…scheme and shadow stack.
Also add 2 more macros to let user able to determine the scheme.
Example code:
```c
#ifdef __riscv_landing_pad
#if defined(__riscv_landing_pad_unlabeled)
...
#elif defined(__riscv_landing_pad_func_sig)
...
#else
#error "Unknown labeling scheme"
#endif
#endif
```
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mylai-mtk
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…109600) This patch adds preprocessor macros when Zicfilp CFI is enabled. To be specific: + `#define __riscv_landing_pad 1` when `-fcf-protection=[full|branch]` + `#define __riscv_landing_pad_unlabeled 1` when `-fcf-protection=[full|branch] -mcf-branch-label-scheme=unlabeled` The macros are proposed in riscv-non-isa/riscv-c-api-doc#76 , and the CLI flags are from riscv-non-isa/riscv-toolchain-conventions#54.
llvm-sync bot
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…or macros (#109600) This patch adds preprocessor macros when Zicfilp CFI is enabled. To be specific: + `#define __riscv_landing_pad 1` when `-fcf-protection=[full|branch]` + `#define __riscv_landing_pad_unlabeled 1` when `-fcf-protection=[full|branch] -mcf-branch-label-scheme=unlabeled` The macros are proposed in riscv-non-isa/riscv-c-api-doc#76 , and the CLI flags are from riscv-non-isa/riscv-toolchain-conventions#54.
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…scheme and shadow stack
__riscv_landing_pad: Defined if the landing pad is enabled.__riscv_landing_pad_unlabeled: Defined if the unlabeled labeling scheme is enabled.__riscv_shadow_stack: Defined if the shadow stack is enabled.