[SystemZ] Add support for the .word directive.

[• zhanjunl]

Summary

Branch off the work to add support for the .word directive, using addAliasForDirective.

[• koriakin]

LGTM

lib/Target/SystemZ/AsmParser/SystemZAsmParser.cpp

 
 public:
   SystemZAsmParser(const MCSubtargetInfo &sti, MCAsmParser &parser,
                    const MCInstrInfo &MII,
                    const MCTargetOptions &Options)
     : MCTargetAsmParser(Options, sti), Parser(parser) {
     MCAsmParserExtension::Initialize(Parser);
 
+    // Alias the .word directive to .short.
+    parser.addAliasForDirective(".word", ".short");
+
     // Initialize the set of available features.
     setAvailableFeatures(ComputeAvailableFeatures(getSTI().getFeatureBits()));
   }
 
   // Override MCTargetAsmParser.
   bool ParseDirective(AsmToken DirectiveID) override;
   bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc, SMLoc &EndLoc) override;
   bool ParseInstruction(ParseInstructionInfo &Info, StringRef Name,

test/MC/SystemZ/word.s

+# RUN: llvm-mc -triple s390x-linux-gnu -filetype=obj %s | \
+# RUN: llvm-readobj -s -sd | FileCheck %s
+
+.section word, "aw"
+.word 0xabcd
+
+# CHECK:        Section {
+# CHECK:          Name: word
+# CHECK-NEXT:     Type: SHT_PROGBITS
+# CHECK-NEXT:     Flags [
+# CHECK-NEXT:       SHF_ALLOC
+# CHECK-NEXT:       SHF_WRITE
+# CHECK-NEXT:     ]
+# CHECK-NEXT:     Address: 0x0
+# CHECK-NEXT:     Offset:
+# CHECK-NEXT:     Size: 2
+# CHECK-NEXT:     Link: 0
+# CHECK-NEXT:     Info: 0
+# CHECK-NEXT:     AddressAlignment:
+# CHECK-NEXT:     EntrySize: 0
+# CHECK-NEXT:     SectionData (
+# CHECK-NEXT:       0000: ABCD
+# CHECK-NEXT:     )
+# CHECK-NEXT:   }