Add backend name to Target to enable runtime info to be fed back into TableGen

Summary:
Make it possible to feed runtime information back to tablegen to enable
profile-guided tablegen-eration, detection of untested tablegen definitions, etc.

Being a cross-compiler by nature, LLVM will potentially collect data for multiple
architectures (e.g. when running 'ninja check'). We therefore need a way for
TableGen to figure out what data applies to the backend it is generating at the
time. This patch achieves that by including the name of the 'def X : Target ...'
for the backend in the TargetRegistry.

Reviewers: qcolombet

Reviewed By: qcolombet

Subscribers: jholewinski, arsenm, jyknight, aditya_nandakumar, sdardis, nemanjai, ab, nhaehnle, t.p.northover, javed.absar, qcolombet, llvm-commits, fedor.sergeev

Differential Revision: https://reviews.llvm.org/D39742

llvm-svn: 318352

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Support/TargetRegistry.cpp b/llvm/lib/Support/TargetRegistry.cpp
index b5c28325311..ed999fce5da 100644
--- a/llvm/lib/Support/TargetRegistry.cpp
+++ b/llvm/lib/Support/TargetRegistry.cpp
@@ -86,9 +86,9 @@ const Target *TargetRegistry::lookupTarget(const std::string &TT,
   return &*I;
 }
 
-void TargetRegistry::RegisterTarget(Target &T,
-                                    const char *Name,
+void TargetRegistry::RegisterTarget(Target &T, const char *Name,
                                     const char *ShortDesc,
+                                    const char *BackendName,
                                     Target::ArchMatchFnTy ArchMatchFn,
                                     bool HasJIT) {
   assert(Name && ShortDesc && ArchMatchFn &&
@@ -105,6 +105,7 @@ void TargetRegistry::RegisterTarget(Target &T,
 
   T.Name = Name;
   T.ShortDesc = ShortDesc;
+  T.BackendName = BackendName;
   T.ArchMatchFn = ArchMatchFn;
   T.HasJIT = HasJIT;
 }