[turbofan] cleanup register allocator interface a little

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index bf64f6665c79d4c7274a8d016e7ec2116cd617fa..94e155422ae828c08cfe31e36166755d4c1f0fde 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -556,7 +556,24 @@ Handle<Code> Pipeline::GenerateCode(Linkage* linkage, PipelineData* data) {
       return Handle<Code>::null();
     }
     ZonePool::Scope zone_scope(data->zone_pool());
-    RegisterAllocator allocator(zone_scope.zone(), &frame, info(), &sequence);
+
+    const char* debug_name = NULL;
+#ifdef DEBUG
+    SmartArrayPointer<char> debug_name_chars;
+    if (info()->IsStub()) {
+      if (info()->code_stub() != NULL) {
+        CodeStub::Major major_key = info()->code_stub()->MajorKey();
+        debug_name = CodeStub::MajorName(major_key, false);
+      }
+    } else {
+      AllowHandleDereference allow_deref;
+      debug_name_chars = info()->function()->debug_name()->ToCString();
+      debug_name = debug_name_chars.get();
+    }
+#endif

[Jarin, 2014/10/29 12:16:51]

Could you extract the code above to a function and possibly reuse it in
Pipeline::GenerateCode(). (Hmm, why did we overload the 'GenerateCode' name?)

+
+    RegisterAllocator allocator(zone_scope.zone(), &frame, &sequence,
+                                debug_name);
     if (!allocator.Allocate(data->pipeline_statistics())) {
       info()->AbortOptimization(kNotEnoughVirtualRegistersRegalloc);
       return Handle<Code>::null();