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3 Commits

Author SHA1 Message Date
Fangrui Song
69bf40c45f [Driver][CodeGen] Support -fpatchable-function-entry=N,M and __attribute__((patchable_function_entry(N,M))) where M>0 
Reviewed By: nickdesaulniers

Differential Revision: https://reviews.llvm.org/D73072
 2020-01-23 17:02:54 -08:00
Fangrui Song
f17ae668a9 [Driver][CodeGen] Add -fpatchable-function-entry=N[,0] 
In the backend, this feature is implemented with the function attribute
"patchable-function-entry". Both the attribute and XRay use
TargetOpcode::PATCHABLE_FUNCTION_ENTER, so the two features are
incompatible.

Reviewed By: ostannard, MaskRay

Differential Revision: https://reviews.llvm.org/D72222
 2020-01-10 09:57:39 -08:00
Fangrui Song
a44c434b68 Support function attribute patchable_function_entry 
This feature is generic. Make it applicable for AArch64 and X86 because
the backend has only implemented NOP insertion for AArch64 and X86.

Reviewed By: nickdesaulniers, aaron.ballman

Differential Revision: https://reviews.llvm.org/D72221
 2020-01-10 09:57:34 -08:00