[PATCH] D19046: Introduce a "patchable-prologue" function attribute

[Sanjoy Das via llvm-commits]

sanjoy created this revision.
sanjoy added reviewers: rnk, joker.eph, echristo.
sanjoy added a subscriber: llvm-commits.
Herald added a subscriber: mcrosier.

`"patchable-prologue"` can be used by an LLVM client to make LLVM
generate function prologues that are easily patchable (i.e. can be
overwritten at runtime to redirect control).  Right now only scheme for
patchable prologue is supported, `"hotpatch-compact"`, but this can be
expanded in the future.  For instance, we could use
`"patchable-prologue"` to support MSVC style hotpatching.

http://reviews.llvm.org/D19046

Files:
  docs/LangRef.rst
  include/llvm/CodeGen/Passes.h
  include/llvm/InitializePasses.h
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/CMakeLists.txt
  lib/CodeGen/CodeGen.cpp
  lib/CodeGen/Passes.cpp
  lib/CodeGen/PatchablePrologues.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/X86/patchable-prologue.ll

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