[PATCH] D29023: [Stack Protection] Add diagnostic information for why stack protection was applied to a function

[James Henderson via Phabricator via llvm-commits]

jhenderson created this revision.
Herald added a subscriber: fhahn.

Stack Smash Protection is not completely free, so in hot code, the overhead it causes can cause performance issues. By adding diagnostic information for which function have SSP and why, a user can quickly determine what they can do to stop SSP being applied to a specific hot function.

This change adds an SSP-specific DiagnosticInfo class and uses of it to the Stack Protection code. A subsequent change to clang will cause the remarks to be emitted when enabled.


https://reviews.llvm.org/D29023

Files:
  include/llvm/IR/DiagnosticInfo.h
  lib/CodeGen/StackProtector.cpp
  lib/IR/DiagnosticInfo.cpp
  test/lit.cfg

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