[mips] [IAS] Add support for the .insn directive.

Summary:
This assembler directive marks the current label as an instruction label in microMIPS and MIPS16.

This initial implementation works only for microMIPS.

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8006

llvm-svn: 235084

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
index 5790a5c649a..ccc019e86aa 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
@@ -54,6 +54,7 @@ void MipsTargetStreamer::emitDirectiveNaN2008() {}
 void MipsTargetStreamer::emitDirectiveNaNLegacy() {}
 void MipsTargetStreamer::emitDirectiveOptionPic0() {}
 void MipsTargetStreamer::emitDirectiveOptionPic2() {}
+void MipsTargetStreamer::emitDirectiveInsn() { forbidModuleDirective(); }
 void MipsTargetStreamer::emitFrame(unsigned StackReg, unsigned StackSize,
                                    unsigned ReturnReg) {}
 void MipsTargetStreamer::emitMask(unsigned CPUBitmask, int CPUTopSavedRegOff) {}
@@ -189,6 +190,11 @@ void MipsTargetAsmStreamer::emitDirectiveOptionPic2() {
   OS << "\t.option\tpic2\n";
 }
 
+void MipsTargetAsmStreamer::emitDirectiveInsn() {
+  MipsTargetStreamer::emitDirectiveInsn();
+  OS << "\t.insn\n";
+}
+
 void MipsTargetAsmStreamer::emitFrame(unsigned StackReg, unsigned StackSize,
                                       unsigned ReturnReg) {
   OS << "\t.frame\t$"
@@ -637,6 +643,12 @@ void MipsTargetELFStreamer::emitDirectiveOptionPic2() {
   MCA.setELFHeaderEFlags(Flags);
 }
 
+void MipsTargetELFStreamer::emitDirectiveInsn() {
+  MipsTargetStreamer::emitDirectiveInsn();
+  MipsELFStreamer &MEF = static_cast<MipsELFStreamer &>(Streamer);
+  MEF.createPendingLabelRelocs();
+}
+
 void MipsTargetELFStreamer::emitFrame(unsigned StackReg, unsigned StackSize,
                                       unsigned ReturnReg_) {
   MCContext &Context = getStreamer().getAssembler().getContext();