Introduce ToNumber stub and use it in non-optimized code for to-number conver...

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
===================================================================
--- src/x64/code-stubs-x64.cc	(revision 6513)
+++ src/x64/code-stubs-x64.cc	(working copy)
@@ -37,6 +37,29 @@
 namespace internal {
 
 #define __ ACCESS_MASM(masm)
+
+void ToNumberStub::Generate(MacroAssembler* masm) {
+  // The ToNumber stub takes one argument in eax.
+  // It is assumed to be already smi-checked.

[William Hesse, 2011/01/28 14:12:28]

This comment is probably wrong.  Otherwise, we wouldn't smi-check here.

[fschneider, 2011/01/28 14:17:32]

Done.

+  NearLabel check_heap_number, call_builtin;
+  __ SmiTest(rax);
+  __ j(not_zero, &check_heap_number);
+  __ ret(0);

[William Hesse, 2011/01/28 14:12:28]

Ret() is an alternative to ret(0).

[fschneider, 2011/01/28 14:17:32]

Done.

+
+  __ bind(&check_heap_number);
+  __ Move(rbx, Factory::heap_number_map());
+  __ cmpq(rbx, FieldOperand(rax, HeapObject::kMapOffset));
+  __ j(not_equal, &call_builtin);
+  __ ret(0);
+
+  __ bind(&call_builtin);
+  __ pop(rcx);  // Pop return address.
+  __ push(rax);
+  __ push(rcx);  // Push return address.
+  __ InvokeBuiltin(Builtins::TO_NUMBER, JUMP_FUNCTION);
+}
+
+
 void FastNewClosureStub::Generate(MacroAssembler* masm) {
   // Create a new closure from the given function info in new
   // space. Set the context to the current context in rsi.