MIPS: Less aggressive polling when concurrently compiling for OSR.

src/mips/builtins-mips.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 948 matching lines @@
   // Compute the target address = code_obj + header_size + osr_offset
   // <entry_addr> = <code_obj> + #header_size + <osr_offset>
   __ addu(v0, v0, a1);
   __ addiu(ra, v0, 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;
+  __ stop("check1");

[Yang, 2013/09/25 14:54:38]

You probably want to remove this :)

[Paul Lind, 2013/09/25 15:05:00]

You probably should remove this ... ;-)
 ... thanks Yang, you beat me to this!

[kilvadyb, 2013/09/25 15:14:28]

Done.

+  __ LoadRoot(at, Heap::kStackLimitRootIndex);
+  __ Branch(&ok, hs, sp, Operand(at));
+  {
+    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) {
   // 1. Make sure we have at least one argument.
   // a0: actual number of arguments
   { Label done;
     __ Branch(&done, ne, a0, Operand(zero_reg));
     __ LoadRoot(t2, Heap::kUndefinedValueRootIndex);
     __ push(t2);
     __ Addu(a0, a0, Operand(1));
     __ bind(&done);
   }
@@ skipping 478 matching lines @@
   __ bind(&dont_adapt_arguments);
   __ Jump(a3);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS