Fast string construct stub (ia32 only for now).

src/ia32/macro-assembler-ia32.cc

 // Copyright 2006-2009 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 1351 matching lines @@
     }
     // The context may be an intermediate context, not a function context.
     mov(dst, Operand(dst, Context::SlotOffset(Context::FCONTEXT_INDEX)));
   } else {  // Slot is in the current function context.
     // The context may be an intermediate context, not a function context.
     mov(dst, Operand(esi, Context::SlotOffset(Context::FCONTEXT_INDEX)));
   }
 }
 
 
+void MacroAssembler::LoadGlobalFunction(int index, Register function) {
+  // Load the global or builtins object from the current context.
+  mov(function, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX)));
+  // Load the global context from the global or builtins object.
+  mov(function, FieldOperand(function, GlobalObject::kGlobalContextOffset));
+  // Load the function from the global context.
+  mov(function, Operand(function, Context::SlotOffset(index)));
+}
+
+
+void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
+                                                  Register map) {
+  // Load the initial map.  The global functions all have initial maps.
+  mov(map, FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
+  if (FLAG_debug_code) {
+    Label ok, fail;
+    CheckMap(map, Factory::meta_map(), &fail, false);
+    jmp(&ok);
+    bind(&fail);
+    Abort("Global functions must have initial map");
+    bind(&ok);
+  }
+}
+
 
 void MacroAssembler::Ret() {
   ret(0);
 }
 
 
 void MacroAssembler::Drop(int stack_elements) {
   if (stack_elements > 0) {
     add(Operand(esp), Immediate(stack_elements * kPointerSize));
   }
@@ skipping 293 matching lines @@
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32