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

src/x64/code-stubs-x64.cc

 // Copyright 2011 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 19 matching lines @@
 #if defined(V8_TARGET_ARCH_X64)
 
 #include "bootstrapper.h"
 #include "code-stubs.h"
 #include "regexp-macro-assembler.h"
 
 namespace v8 {
 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.
   Label gc;
   __ AllocateInNewSpace(JSFunction::kSize, rax, rbx, rcx, &gc, TAG_OBJECT);
 
   // Get the function info from the stack.
   __ movq(rdx, Operand(rsp, 1 * kPointerSize));
 
   // Compute the function map in the current global context and set that
@@ skipping 4340 matching lines @@
 
   // Do a tail call to the rewritten stub.
   __ jmp(rdi);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64