Perform string add in generated code on IA-32 platforms...

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 802 matching lines @@
                      scratch2,
                      gc_required,
                      TAG_OBJECT);
 
   // Set the map.
   mov(FieldOperand(result, HeapObject::kMapOffset),
       Immediate(Factory::heap_number_map()));
 }
 
 
+void MacroAssembler::AllocateTwoByteString(Register result,
+                                           Register length,
+                                           Register scratch1,
+                                           Register scratch2,
+                                           Register scratch3,
+                                           Label* gc_required) {
+  // Calculate the number of words needed for the number of characters in the
+  // string
+  mov(scratch1, length);
+  add(Operand(scratch1), Immediate(1));
+  shr(scratch1, 1);
+
+  // Allocate two byte string in new space.
+  AllocateInNewSpace(SeqTwoByteString::kHeaderSize,
+                     times_4,
+                     scratch1,
+                     result,
+                     scratch2,
+                     scratch3,
+                     gc_required,
+                     TAG_OBJECT);
+
+  // Set the map, length and hash field.
+  mov(FieldOperand(result, HeapObject::kMapOffset),
+      Immediate(Factory::string_map()));
+  mov(FieldOperand(result, String::kLengthOffset), length);
+  mov(FieldOperand(result, String::kHashFieldOffset),
+      Immediate(String::kEmptyHashField));
+}
+
+
+void MacroAssembler::AllocateAsciiString(Register result,
+                                         Register length,
+                                         Register scratch1,
+                                         Register scratch2,
+                                         Register scratch3,
+                                         Label* gc_required) {
+  // Calculate the number of words needed for the number of characters in the
+  // string
+  mov(scratch1, length);
+  add(Operand(scratch1), Immediate(3));
+  shr(scratch1, 2);
+
+  // Allocate ascii string in new space.
+  AllocateInNewSpace(SeqAsciiString::kHeaderSize,
+                     times_4,
+                     scratch1,
+                     result,
+                     scratch2,
+                     scratch3,
+                     gc_required,
+                     TAG_OBJECT);
+
+  // Set the map, length and hash field.
+  mov(FieldOperand(result, HeapObject::kMapOffset),
+      Immediate(Factory::ascii_string_map()));
+  mov(FieldOperand(result, String::kLengthOffset), length);
+  mov(FieldOperand(result, String::kHashFieldOffset),
+      Immediate(String::kEmptyHashField));
+}
+
+
+void MacroAssembler::AllocateConsString(Register result,
+                                        Register scratch1,
+                                        Register scratch2,
+                                        Label* gc_required) {
+  // Allocate heap number in new space.
+  AllocateInNewSpace(ConsString::kSize,
+                     result,
+                     scratch1,
+                     scratch2,
+                     gc_required,
+                     TAG_OBJECT);
+
+  // Set the map. The other fields are left uninitialized.
+  mov(FieldOperand(result, HeapObject::kMapOffset),
+      Immediate(Factory::cons_string_map()));
+}
+
+
+void MacroAssembler::AllocateAsciiConsString(Register result,
+                                             Register scratch1,
+                                             Register scratch2,
+                                             Label* gc_required) {
+  // Allocate heap number in new space.
+  AllocateInNewSpace(ConsString::kSize,
+                     result,
+                     scratch1,
+                     scratch2,
+                     gc_required,
+                     TAG_OBJECT);
+
+  // Set the map. The other fields are left uninitialized.
+  mov(FieldOperand(result, HeapObject::kMapOffset),
+      Immediate(Factory::cons_ascii_string_map()));
+}
+
+
 void MacroAssembler::NegativeZeroTest(CodeGenerator* cgen,
                                       Register result,
                                       Register op,
                                       JumpTarget* then_target) {
   JumpTarget ok;
   test(result, Operand(result));
   ok.Branch(not_zero, taken);
   test(op, Operand(op));
   then_target->Branch(sign, not_taken);
   ok.Bind();
@@ skipping 73 matching lines @@
   bind(&done);
 }
 
 
 void MacroAssembler::CallStub(CodeStub* stub) {
   ASSERT(allow_stub_calls());  // calls are not allowed in some stubs
   call(stub->GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
+void MacroAssembler::TailCallStub(CodeStub* stub) {
+  ASSERT(allow_stub_calls());  // calls are not allowed in some stubs
+  jmp(stub->GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
 void MacroAssembler::StubReturn(int argc) {
   ASSERT(argc >= 1 && generating_stub());
   ret((argc - 1) * kPointerSize);
 }
 
 
 void MacroAssembler::IllegalOperation(int num_arguments) {
   if (num_arguments > 0) {
     add(Operand(esp), Immediate(num_arguments * kPointerSize));
   }
@@ skipping 374 matching lines @@
   // Indicate that code has changed.
   CPU::FlushICache(address_, size_);
 
   // 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