Add an instruction deprecation feature to TableGen.

The 'Deprecated' class allows you to specify a SubtargetFeature that the
instruction is deprecated on.

The 'ComplexDeprecationPredicate' class allows you to define a custom
predicate that is called to check for deprecation.
For example:
  ComplexDeprecationPredicate<"MCR">

would mean you would have to define the following function:
  bool getMCRDeprecationInfo(MCInst &MI, MCSubtargetInfo &STI,
                             std::string &Info)

Which returns 'false' for not deprecated, and 'true' for deprecated
and store the warning message in 'Info'.

The MCTargetAsmParser constructor was chaned to take an extra argument of
the MCInstrInfo class, so out-of-tree targets will need to be changed.

llvm-svn: 190598

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index d1e11535548..6004f667927 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -248,6 +248,9 @@ namespace llvm {
     bool isCodeGenOnly;
     bool isPseudo;
 
+    std::string DeprecatedReason;
+    bool HasComplexDeprecationPredicate;
+
     /// Are there any undefined flags?
     bool hasUndefFlags() const {
       return mayLoad_Unset || mayStore_Unset || hasSideEffects_Unset;