[AArch64] Refactor AArch64NamedImmMapper to become dependent on subtarget features.

In order to introduce v8.1a-specific entities, Mappers should be aware of SubtargetFeatures available.

This patch introduces refactoring, that will then allow to easily introduce:

- v8.1-specific "pan" PState for PStateMapper (PAN extension)

- v8.1-specific sysregs for SysRegMapper (LOR,VHE extensions)

Reviewers: jmolloy

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8496

Patch by Tom Coxon

llvm-svn: 235089

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp b/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
index fb25089580f..6f964c81372 100644
--- a/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
+++ b/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
@@ -1504,7 +1504,10 @@ static DecodeStatus DecodeSystemPStateInstruction(llvm::MCInst &Inst,
   Inst.addOperand(MCOperand::CreateImm(crm));
 
   bool ValidNamed;
-  (void)AArch64PState::PStateMapper().toString(pstate_field, ValidNamed);
+  const AArch64Disassembler *Dis = 
+      static_cast<const AArch64Disassembler *>(Decoder);
+  (void)AArch64PState::PStateMapper().toString(pstate_field, 
+      Dis->getSubtargetInfo().getFeatureBits(), ValidNamed);
 
   return ValidNamed ? Success : Fail;
 }