[mips] Improve encapsulation of the .MIPS.abiflags implementation and limit scope of related enums

Summary:
Follow on to r212519 to improve the encapsulation and limit the scope of the enums.

Also merged two very similar parser functions, fixed a bug where ASE's
were not being reported, and marked CPR1's as being 128-bit when MSA is
enabled.

Differential Revision: http://reviews.llvm.org/D4384

llvm-svn: 212522

1 files changed, 46 insertions, 0 deletions

diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsABIFlagsSection.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsABIFlagsSection.cpp
new file mode 100644
index 00000000000..a901af2df75
--- /dev/null
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsABIFlagsSection.cpp
@@ -0,0 +1,46 @@
+//===-- MipsABIFlagsSection.cpp - Mips ELF ABI Flags Section ---*- C++ -*--===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MipsABIFlagsSection.h"
+
+using namespace llvm;
+
+StringRef MipsABIFlagsSection::getFpABIString(Val_GNU_MIPS_ABI Value,
+                                              bool Is32BitAbi) {
+  switch (Value) {
+  case MipsABIFlagsSection::Val_GNU_MIPS_ABI_FP_XX:
+    return "xx";
+  case MipsABIFlagsSection::Val_GNU_MIPS_ABI_FP_64:
+    return "64";
+  case MipsABIFlagsSection::Val_GNU_MIPS_ABI_FP_DOUBLE:
+    if (Is32BitAbi)
+      return "32";
+    return "64";
+  default:
+    llvm_unreachable("unsupported fp abi value");
+  }
+}
+
+namespace llvm {
+MCStreamer &operator<<(MCStreamer &OS, MipsABIFlagsSection &ABIFlagsSection) {
+  // Write out a Elf_Internal_ABIFlags_v0 struct
+  OS.EmitIntValue(ABIFlagsSection.getVersion(), 2);         // version
+  OS.EmitIntValue(ABIFlagsSection.getISALevel(), 1);        // isa_level
+  OS.EmitIntValue(ABIFlagsSection.getISARevision(), 1);     // isa_rev
+  OS.EmitIntValue(ABIFlagsSection.getGPRSize(), 1);         // gpr_size
+  OS.EmitIntValue(ABIFlagsSection.getCPR1Size(), 1);        // cpr1_size
+  OS.EmitIntValue(ABIFlagsSection.getCPR2Size(), 1);        // cpr2_size
+  OS.EmitIntValue(ABIFlagsSection.getFpABI(), 1);           // fp_abi
+  OS.EmitIntValue(ABIFlagsSection.getISAExtensionSet(), 4); // isa_ext
+  OS.EmitIntValue(ABIFlagsSection.getASESet(), 4);          // ases
+  OS.EmitIntValue(ABIFlagsSection.getFlags1(), 4);          // flags1
+  OS.EmitIntValue(ABIFlagsSection.getFlags2(), 4);          // flags2
+  return OS;
+}
+}