Allow the MCDisassembler to return a "soft fail" status code, indicating an instruction that is disassemblable, but invalid. Only used for ARM UNPREDICTABLE instructions at the moment.

Patch by James Molloy.

llvm-svn: 137830

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/DisassemblerEmitter.cpp b/llvm/utils/TableGen/DisassemblerEmitter.cpp
index 1269253..ccf644b 100644
--- a/llvm/utils/TableGen/DisassemblerEmitter.cpp
+++ b/llvm/utils/TableGen/DisassemblerEmitter.cpp
@@ -128,5 +128,15 @@ void DisassemblerEmitter::run(raw_ostream &OS) {
     return;
   }
 
+  // ARM and Thumb have a CHECK() macro to deal with DecodeStatuses.
+  if (Target.getName() == "ARM" ||
+      Target.getName() == "Thumb") {
+    FixedLenDecoderEmitter(Records,
+                           "CHECK(S, ", ");",
+                           "S", "Fail",
+                           "DecodeStatus S = Success;\n(void)S;").run(OS);
+    return;
+  }
+
   FixedLenDecoderEmitter(Records).run(OS);
 }