This reverts commit ad36e4284d66c3609ef8675ef02ff1844bc1951d, fixing a single uninitialized bit (which cannot be detected with Address Sanitizer). This PR adds support for the llvm-mc command-line flag "--gsframe" and adds ".sframe" to the legal values passed ".cfi_section". It plumbs the option through the cfi handling code a fair amount. Code to support actual section generation follows in a future PR. These options match the gnu-assembler's support syntax for sframes, on both the command line and in assembly files. First in a series of changes that will allow llvm-mc to produce sframe .cfi sections. For more information about sframes, see https://sourceware.org/binutils/docs-2.44/sframe-spec.html and the llvm-RFC here: https://discourse.llvm.org/t/rfc-adding-sframe-support-to-llvm/86900
This reverts commit f9d0bd02d966e5c28aca9a6ceadd5ffec6aa9f78.
This PR adds support for the llvm-mc command-line flag "--gsframe" and adds ".sframe" to the legal values passed ".cfi_section". It plumbs the option through the cfi handling code a fair amount. Code to support actual section generation follows in a future PR. These options match the gnu-assembler's support syntax for sframes, on both the command line and in assembly files. First in a series of changes that will allow llvm-mc to produce sframe .cfi sections. For more information about sframes, see https://sourceware.org/binutils/docs-2.44/sframe-spec.html and the llvm-RFC here: https://discourse.llvm.org/t/rfc-adding-sframe-support-to-llvm/86900
Re-apply #113148 after revert in #119331
If function pointer signing is enabled, sign personality function
pointer stored in `.DW.ref.__gxx_personality_v0` section with IA key,
0x7EAD = `ptrauth_string_discriminator("personality")` constant
discriminator and address diversity enabled.
Reverts llvm/llvm-project#113148 See buildbot failure https://lab.llvm.org/buildbot/#/builders/190/builds/11048
If function pointer signing is enabled, sign personality function
pointer stored in `.DW.ref.__gxx_personality_v0` section with IA key,
0x7EAD = `ptrauth_string_discriminator("personality")` constant
discriminator and address diversity enabled.
Use a forward-declaration instead.
Consider only targets where `MCAsmInfo::ExceptionsType == ExceptionHandling::None` and that support CFI (when `MCAsmInfo::UsesCFIForDebug` is set to true): currently, only AMDGPU. This patch enables the emission of CFI information in the .eh_frame section when the uwtable attribute is present on a function. Before, we could generate CFI information for debugging puproses only. This patch prepares AMDGPU to support collecting GPU stack traces in the future. I did a first implementation (https://reviews.llvm.org/D139024) but at the time I had not realized that no other platform used `UsesCFIForDebug`. Reviewed By: scott.linder Differential Revision: https://reviews.llvm.org/D151806
It was only ever used there, already. The previous location seems left-over from when the personality function was specified on a per-landingpad basis, instead of per-function.