Optimize functions on a second thread.

src/ia32/builtins-ia32.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 56 matching lines @@
     ASSERT(extra_args == NO_EXTRA_ARGUMENTS);
   }
 
   // JumpToExternalReference expects eax to contain the number of arguments
   // including the receiver and the extra arguments.
   __ add(eax, Immediate(num_extra_args + 1));
   __ JumpToExternalReference(ExternalReference(id, masm->isolate()));
 }
 
 
+static void GenerateTailCallToSharedCode(MacroAssembler* masm) {
+  __ mov(eax, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
+  __ mov(eax, FieldOperand(eax, SharedFunctionInfo::kCodeOffset));
+  __ add(eax, Immediate(Code::kHeaderSize - kHeapObjectTag));

[Yang, 2012/07/19 12:47:30]

Use the lea instruction and FieldOperand would be easier to read.

[sanjoy, 2012/07/19 15:06:09]

Done.

+  __ jmp(eax);
+}
+
+
+void Builtins::Generate_InRecompileQueue(MacroAssembler* masm) {
+  GenerateTailCallToSharedCode(masm);
+}
+
+
+void Builtins::Generate_ParallelRecompile(MacroAssembler* masm) {
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+
+    // Push a copy of the function onto the stack.
+    __ push(edi);
+    // Push call kind information.
+    __ push(ecx);
+
+    __ push(edi);  // Function is also the parameter to the runtime call.
+    __ CallRuntime(Runtime::kParallelRecompile, 1);
+
+    // Restore call kind information.
+    __ pop(ecx);
+    // Restore receiver.
+    __ pop(edi);
+
+    // Tear down internal frame.
+  }
+
+  GenerateTailCallToSharedCode(masm);
+}
+
+
 static void Generate_JSConstructStubHelper(MacroAssembler* masm,
                                            bool is_api_function,
                                            bool count_constructions) {
   // ----------- S t a t e -------------
   //  -- eax: number of arguments
   //  -- edi: constructor function
   // -----------------------------------
 
   // Should never count constructions for api objects.
   ASSERT(!is_api_function || !count_constructions);
@@ skipping 1643 matching lines @@
   Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR);
   generator.Generate();
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32