Allow public Triple deduction from ObjectFiles.

Move logic that allows for Triple deduction from an ObjectFile object
out of llvm-objdump.cpp into a public factory, found in the ObjectFile
class.

This should allow other tools in the future to use this logic without
reimplementation.

Patch by Mitch Phillips

Differential Revision: https://reviews.llvm.org/D37719

llvm-svn: 313605

1 files changed, 2 insertions, 20 deletions

diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
index 5b16abf25c6..09396466c40 100644
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -362,29 +362,11 @@ static const Target *getTarget(const ObjectFile *Obj = nullptr) {
   llvm::Triple TheTriple("unknown-unknown-unknown");
   if (TripleName.empty()) {
     if (Obj) {
-      auto Arch = Obj->getArch();
-      TheTriple.setArch(Triple::ArchType(Arch));
-
-      // For ARM targets, try to use the build attributes to build determine
-      // the build target. Target features are also added, but later during
-      // disassembly.
-      if (Arch == Triple::arm || Arch == Triple::armeb) {
-        Obj->setARMSubArch(TheTriple);
-      }
-
-      // TheTriple defaults to ELF, and COFF doesn't have an environment:
-      // the best we can do here is indicate that it is mach-o.
-      if (Obj->isMachO())
-        TheTriple.setObjectFormat(Triple::MachO);
-
-      if (Obj->isCOFF()) {
-        const auto COFFObj = dyn_cast<COFFObjectFile>(Obj);
-        if (COFFObj->getArch() == Triple::thumb)
-          TheTriple.setTriple("thumbv7-windows");
-      }
+      TheTriple = Obj->makeTriple();
     }
   } else {
     TheTriple.setTriple(Triple::normalize(TripleName));
+
     // Use the triple, but also try to combine with ARM build attributes.
     if (Obj) {
       auto Arch = Obj->getArch();