[ARM] Enable objdump to construct triple for ARM

Now that The ARMAttributeParser has been moved into the library,
it has been modified so that it can parse the attributes without
printing them and stores them in a map. ELFObjectFile now queries
the attributes to fill out the architecture details of a provided
triple for 'arm' and 'thumb' targets. llvm-objdump uses this new
functionality.

Differential Revision: https://reviews.llvm.org/D28281

llvm-svn: 291898

1 files changed, 65 insertions, 0 deletions

diff --git a/llvm/lib/Object/ELFObjectFile.cpp b/llvm/lib/Object/ELFObjectFile.cpp
index 4bd69e34e3c..d33da47d6cb 100644
--- a/llvm/lib/Object/ELFObjectFile.cpp
+++ b/llvm/lib/Object/ELFObjectFile.cpp
@@ -122,4 +122,69 @@ SubtargetFeatures ELFObjectFileBase::getFeatures() const {
   }
 }
 
+// FIXME Encode from a tablegen description or target parser.
+void ELFObjectFileBase::setARMSubArch(Triple &TheTriple) const {
+  if (TheTriple.getSubArch() != Triple::NoSubArch)
+    return;
+
+  ARMAttributeParser Attributes;
+  std::error_code EC = getBuildAttributes(Attributes);
+  if (EC)
+    return;
+
+  std::string Triple;
+  // Default to ARM, but use the triple if it's been set.
+  if (TheTriple.getArch() == Triple::thumb ||
+      TheTriple.getArch() == Triple::thumbeb)
+    Triple = "thumb";
+  else
+    Triple = "arm";
+
+  switch(Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch)) {
+  case ARMBuildAttrs::v4:
+    Triple += "v4";
+    break;
+  case ARMBuildAttrs::v4T:
+    Triple += "v4t";
+    break;
+  case ARMBuildAttrs::v5T:
+    Triple += "v5t";
+    break;
+  case ARMBuildAttrs::v5TE:
+    Triple += "v5te";
+    break;
+  case ARMBuildAttrs::v5TEJ:
+    Triple += "v5tej";
+    break;
+  case ARMBuildAttrs::v6:
+    Triple += "v6";
+    break;
+  case ARMBuildAttrs::v6KZ:
+    Triple += "v6kz";
+    break;
+  case ARMBuildAttrs::v6T2:
+    Triple += "v6t2";
+    break;
+  case ARMBuildAttrs::v6K:
+    Triple += "v6k";
+    break;
+  case ARMBuildAttrs::v7:
+    Triple += "v7";
+    break;
+  case ARMBuildAttrs::v6_M:
+    Triple += "v6m";
+    break;
+  case ARMBuildAttrs::v6S_M:
+    Triple += "v6sm";
+    break;
+  case ARMBuildAttrs::v7E_M:
+    Triple += "v7em";
+    break;
+  }
+  if (!isLittleEndian())
+    Triple += "eb";
+
+  TheTriple.setArchName(Triple);
+}
+
 } // end namespace llvm