[PATCH] D120362: [sanitizer][sancov] Refactor GetNextInstructionPc/GetPreviousInstructionPc

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
MaskRay added reviewers: Sanitizers, morehouse, vitalybuka.
Herald added subscribers: luke957, pengfei, s.egerton, atanasyan, simoncook, fedor.sergeev, arichardson, sdardis, jyknight.
MaskRay requested review of this revision.
Herald added subscribers: llvm-commits, pcwang-thead.
Herald added projects: Sanitizers, LLVM.

x86 uses offset 1 while most RISC architectures use offset 4.
Check x86 first to prevent changes for new RISC architectures.

For sancov, `getPreviousInstructionPc` does not use the `PC - 8` code path for
Sparc. Triple.h does not have isSparc yet and I hope someone can investigate
why Mips/Sparc use the weird -8.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120362

Files:
  compiler-rt/lib/fuzzer/FuzzerTracePC.cpp
  compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cpp
  compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h
  llvm/tools/sancov/sancov.cpp

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