ARM: Implement OSR infrastructure.

src/arm/builtins-arm.cc

 // Copyright 2010 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 1138 matching lines @@
   Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
 }
 
 
 void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
   Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
 }
 
 
 void Builtins::Generate_NotifyOSR(MacroAssembler* masm) {
-  __ stop("builtins-arm.cc: NotifyOSR");
+  // 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.
+  __ stm(db_w, sp, kJSCallerSaved | kCalleeSaved | lr.bit() | fp.bit());
+  __ EnterInternalFrame();
+  __ CallRuntime(Runtime::kNotifyOSR, 0);
+  __ LeaveInternalFrame();
+  __ ldm(ia_w, sp, kJSCallerSaved | kCalleeSaved | lr.bit() | fp.bit());
+  __ Ret();
 }
 
 
 void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
-  __ stop("builtins-arm.cc: OnStackReplacement");
+  // Probe the CPU to set the supported features, because this builtin
+  // may be called before the initialization performs CPU setup.
+  CpuFeatures::Probe(false);
+
+  // Lookup the function in the JavaScript frame and push it as an
+  // argument to the on-stack replacement function.
+  __ ldr(r0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ EnterInternalFrame();
+  __ push(r0);
+  __ CallRuntime(Runtime::kCompileForOnStackReplacement, 1);
+  __ LeaveInternalFrame();
+
+  // If the result was -1 it means that we couldn't optimize the
+  // function. Just return and continue in the unoptimized version.
+  Label skip;
+  __ cmp(r0, Operand(Smi::FromInt(-1)));
+  __ b(ne, &skip);
+  __ Ret();
+
+  __ bind(&skip);
+  // Untag the AST id and push it on the stack.
+  __ SmiUntag(r0);
+  __ push(r0);
+
+  // Generate the code for doing the frame-to-frame translation using
+  // the deoptimizer infrastructure.
+  Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR);
+  generator.Generate();
 }
 
 
 void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
   // 1. Make sure we have at least one argument.
   // r0: actual number of arguments
   { Label done;
     __ tst(r0, Operand(r0));
     __ b(ne, &done);
     __ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
@@ skipping 390 matching lines @@
   __ bind(&dont_adapt_arguments);
   __ Jump(r3);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM