Allow bailing out of the register allocator when running out of virtual registers.

src/hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 607 matching lines @@
   start_environment_ =
       new(zone()) HEnvironment(NULL, info->scope(), info->closure());
   start_environment_->set_ast_id(AstNode::kFunctionEntryId);
   entry_block_ = CreateBasicBlock();
   entry_block_->SetInitialEnvironment(start_environment_);
 }
 
 
 Handle<Code> HGraph::Compile(CompilationInfo* info) {
   int values = GetMaximumValueID();
-  if (values > LAllocator::max_initial_value_ids()) {
+  if (values > LUnallocated::kMaxVirtualRegisters) {
     if (FLAG_trace_bailout) {
-      SmartArrayPointer<char> name(
-          info->shared_info()->DebugName()->ToCString());
-      PrintF("Function @\"%s\" is too big.\n", *name);
+      PrintF("Not enough virtual registers for (values).\n");
     }
     return Handle<Code>::null();
   }
-
   LAllocator allocator(values, this);
   LChunkBuilder builder(info, this, &allocator);
   LChunk* chunk = builder.Build();
   if (chunk == NULL) return Handle<Code>::null();
 
-  if (!FLAG_alloc_lithium) return Handle<Code>::null();
-
-  allocator.Allocate(chunk);
-
-  if (!FLAG_use_lithium) return Handle<Code>::null();
+  if (!allocator.Allocate(chunk)) {
+    if (FLAG_trace_bailout) {
+      PrintF("Not enough virtual registers (regalloc).\n");
+    }
+    return Handle<Code>::null();
+  }
 
   MacroAssembler assembler(info->isolate(), NULL, 0);
   LCodeGen generator(chunk, &assembler, info);
 
   if (FLAG_eliminate_empty_blocks) {
     chunk->MarkEmptyBlocks();
   }
 
   if (generator.GenerateCode()) {
     if (FLAG_trace_codegen) {
@@ skipping 6798 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal