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ae0cafece8
subtarget features for indirect calls and indirect branches. This is in preparation for enabling *only* the call retpolines when using speculative load hardening. I've continued to use subtarget features for now as they continue to seem the best fit given the lack of other retpoline like constructs so far. The LLVM side is pretty simple. I'd like to eventually get rid of the old feature, but not sure what backwards compatibility issues that will cause. This does remove the "implies" from requesting an external thunk. This always seemed somewhat questionable and is now clearly not desirable -- you specify a thunk the same way no matter which set of things are getting retpolines. I really want to keep this nicely isolated from end users and just an LLVM implementation detail, so I've moved the `-mretpoline` flag in Clang to no longer rely on a specific subtarget feature by that name and instead to be directly handled. In some ways this is simpler, but in order to preserve existing behavior I've had to add some fallback code so that users who relied on merely passing -mretpoline-external-thunk continue to get the same behavior. We should eventually remove this I suspect (we have never tested that it works!) but I've not done that in this patch. Differential Revision: https://reviews.llvm.org/D51150 llvm-svn: 340515 |
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| .. | ||
| AArch64.cpp | ||
| AArch64.h | ||
| ARM.cpp | ||
| ARM.h | ||
| Mips.cpp | ||
| Mips.h | ||
| PPC.cpp | ||
| PPC.h | ||
| RISCV.cpp | ||
| RISCV.h | ||
| Sparc.cpp | ||
| Sparc.h | ||
| SystemZ.cpp | ||
| SystemZ.h | ||
| X86.cpp | ||
| X86.h | ||