[PowerPC] ELFv2 MC support for .abiversion directive

ELFv2 binaries are marked by a bit in the ELF header e_flags field.
A new assembler directive .abiversion can be used to set that flag.
This patch implements support in the PowerPC MC streamers to emit the
.abiversion directive (both into assembler and ELF binary output),
as well as support in the assembler parser to parse the .abiversion
directive.

Reviewed by Hal Finkel.

llvm-svn: 213484

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
index 2f562ca7891..7560a7a1831 100644
--- a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
+++ b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
@@ -244,6 +244,7 @@ class PPCAsmParser : public MCTargetAsmParser {
   bool ParseDirectiveTC(unsigned Size, SMLoc L);
   bool ParseDirectiveMachine(SMLoc L);
   bool ParseDarwinDirectiveMachine(SMLoc L);
+  bool ParseDirectiveAbiVersion(SMLoc L);
 
   bool MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
                                OperandVector &Operands, MCStreamer &Out,
@@ -1412,6 +1413,8 @@ bool PPCAsmParser::ParseDirective(AsmToken DirectiveID) {
       return ParseDirectiveTC(isPPC64()? 8 : 4, DirectiveID.getLoc());
     if (IDVal == ".machine")
       return ParseDirectiveMachine(DirectiveID.getLoc());
+    if (IDVal == ".abiversion")
+      return ParseDirectiveAbiVersion(DirectiveID.getLoc());
   } else {
     if (IDVal == ".machine")
       return ParseDarwinDirectiveMachine(DirectiveID.getLoc());
@@ -1534,6 +1537,27 @@ bool PPCAsmParser::ParseDarwinDirectiveMachine(SMLoc L) {
   return false;
 }
 
+/// ParseDirectiveAbiVersion
+///  ::= .abiversion constant-expression
+bool PPCAsmParser::ParseDirectiveAbiVersion(SMLoc L) {
+  int64_t AbiVersion;
+  if (getParser().parseAbsoluteExpression(AbiVersion)){
+    Error(L, "expected constant expression");
+    return false;
+  }
+  if (getLexer().isNot(AsmToken::EndOfStatement)) {
+    Error(L, "unexpected token in directive");
+    return false;
+  }
+
+  PPCTargetStreamer &TStreamer =
+      *static_cast<PPCTargetStreamer *>(
+           getParser().getStreamer().getTargetStreamer());
+  TStreamer.emitAbiVersion(AbiVersion);
+
+  return false;
+}
+
 /// Force static initialization.
 extern "C" void LLVMInitializePowerPCAsmParser() {
   RegisterMCAsmParser<PPCAsmParser> A(ThePPC32Target);