[ARM] Use new assembler diags for ARM

This converts the ARM AsmParser to use the new assembly matcher error
reporting mechanism, which allows errors to be reported for multiple
instruction encodings when it is ambiguous which one the user intended
to use.

By itself this doesn't improve many error messages, because we don't have
diagnostic text for most operand types, but as we add that then this will allow
more of those diagnostic strings to be used when they are relevant.

Differential revision: https://reviews.llvm.org/D31530

llvm-svn: 314779

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARM.td b/llvm/lib/Target/ARM/ARM.td
index 25b9802f541..c1a3f639461 100644
--- a/llvm/lib/Target/ARM/ARM.td
+++ b/llvm/lib/Target/ARM/ARM.td
@@ -1022,6 +1022,10 @@ def ARMAsmWriter : AsmWriter {
   bit isMCAsmWriter = 1;
 }
 
+def ARMAsmParser : AsmParser {
+  bit ReportMultipleNearMisses = 1;
+}
+
 def ARMAsmParserVariant : AsmParserVariant {
   int Variant = 0;
   string Name = "ARM";
@@ -1032,5 +1036,6 @@ def ARM : Target {
   // Pull in Instruction Info.
   let InstructionSet = ARMInstrInfo;
   let AssemblyWriters = [ARMAsmWriter];
+  let AssemblyParsers = [ARMAsmParser];
   let AssemblyParserVariants = [ARMAsmParserVariant];
 }