A64: Synchronize with r16993.

src/a64/builtins-a64.cc

 // Copyright 2013 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 867 matching lines @@
 void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
   Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
 }
 
 
 void Builtins::Generate_NotifySoftDeoptimized(MacroAssembler* masm) {
   Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::SOFT);
 }
 
 
-void Builtins::Generate_NotifyOSR(MacroAssembler* masm) {
-  // For now, we are relying on the fact that Runtime::NotifyOSR
-  // doesn't do any garbage collection which allows us to save/restore
-  // the registers without worrying about which of them contain
-  // pointers. This seems a bit fragile.
-  //
-  // TODO(jochen): Is it correct (and appropriate) to use safepoint
-  // registers here? According to the comment above, we should only need to
-  // preserve the registers with parameters.
-  __ PushXRegList(kSafepointSavedRegisters);
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    __ CallRuntime(Runtime::kNotifyOSR, 0);
-  }
-  __ PopXRegList(kSafepointSavedRegisters);
-  __ Ret();
-}
-
-
 void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
   // Lookup the function in the JavaScript frame.
   __ Ldr(x0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
     // Lookup and calculate pc offset.
     __ Ldr(x1, MemOperand(fp, StandardFrameConstants::kCallerPCOffset));
     __ Ldr(x2, FieldMemOperand(x0, JSFunction::kSharedFunctionInfoOffset));
     __ Ldr(x2, FieldMemOperand(x2, SharedFunctionInfo::kCodeOffset));
     __ Sub(x1, x1, Code::kHeaderSize - kHeapObjectTag);
@@ skipping 24 matching lines @@
   // Compute the target address = code_obj + header_size + osr_offset
   // <entry_addr> = <code_obj> + #header_size + <osr_offset>
   __ Add(x0, x0, x1);
   __ Add(lr, x0, Code::kHeaderSize - kHeapObjectTag);
 
   // And "return" to the OSR entry point of the function.
   __ Ret();
 }
 
 
+void Builtins::Generate_OsrAfterStackCheck(MacroAssembler* masm) {
+  // We check the stack limit as indicator that recompilation might be done.
+  Label ok;
+  __ CompareRoot(jssp, Heap::kStackLimitRootIndex);
+  __ B(hs, &ok);
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+    __ CallRuntime(Runtime::kStackGuard, 0);
+  }
+  __ Jump(masm->isolate()->builtins()->OnStackReplacement(),
+          RelocInfo::CODE_TARGET);
+
+  __ Bind(&ok);
+  __ Ret();
+}
+
+
 void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
   Register receiver_type = x13;
 
   ASM_LOCATION("Builtins::Generate_FunctionCall");
   // TODO(all/rames): Optimize and use named registers.
   // 1. Make sure we have at least one argument.
   // x0: actual number of arguments
   { Label done;
     __ Cbnz(x0, &done);
     __ LoadRoot(x10, Heap::kUndefinedValueRootIndex);
@@ skipping 477 matching lines @@
   __ Bind(&dont_adapt_arguments);
   __ Jump(x3);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM