Add allocation support to ia32 macro assembler

src/ia32/macro-assembler-ia32.cc

 // Copyright 2006-2008 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 602 matching lines @@
                      Context::SECURITY_TOKEN_INDEX * kPointerSize;
   mov(scratch, FieldOperand(scratch, token_offset));
   cmp(scratch, FieldOperand(holder_reg, token_offset));
   pop(holder_reg);
   j(not_equal, miss, not_taken);
 
   bind(&same_contexts);
 }
 
 
+void MacroAssembler::LoadAllocationTopHelper(
+    Register result,
+    Register result_end,
+    Register scratch,
+    bool result_contains_top_on_entry) {
+  ExternalReference new_space_allocation_top =
+      ExternalReference::new_space_allocation_top_address();
+
+  // Just return if allocation top is already known.
+  if (result_contains_top_on_entry) {
+    // No use of scratch if allocation top is provided.
+    ASSERT(scratch.is(no_reg));
+    return;
+  }
+
+  // Move address of new object to result. Use scratch register if available.
+  if (scratch.is(no_reg)) {
+    mov(result, Operand::StaticVariable(new_space_allocation_top));
+  } else {
+    ASSERT(!scratch.is(result_end));
+    mov(Operand(scratch), Immediate(new_space_allocation_top));
+    mov(result, Operand(scratch, 0));
+  }
+}
+
+
+void MacroAssembler::UpdateAllocationTopHelper(Register result_end,
+                                               Register scratch) {
+  ExternalReference new_space_allocation_top =
+      ExternalReference::new_space_allocation_top_address();
+
+  // Update new top. Use scratch if available.
+  if (scratch.is(no_reg)) {
+    mov(Operand::StaticVariable(new_space_allocation_top), result_end);
+  } else {
+    mov(Operand(scratch, 0), result_end);
+  }
+}
+
+void MacroAssembler::AllocateObjectInNewSpace(
+    int object_size,
+    Register result,
+    Register result_end,
+    Register scratch,
+    Label* gc_required,
+    bool result_contains_top_on_entry) {
+  ASSERT(!result.is(result_end));
+
+  // Load address of new object into result.
+  ExternalReference new_space_allocation_limit =
+      ExternalReference::new_space_allocation_limit_address();
+  LoadAllocationTopHelper(result,
+                          result_end,
+                          scratch,
+                          result_contains_top_on_entry);
+
+  // Calculate new top and bail out if new space is exhausted.
+  lea(result_end, Operand(result, object_size));
+  cmp(result_end, Operand::StaticVariable(new_space_allocation_limit));
+  j(above, gc_required, not_taken);
+
+  // Update allocation top.
+  UpdateAllocationTopHelper(result_end, scratch);
+}
+
+
+void MacroAssembler::AllocateObjectInNewSpace(
+    int header_size,
+    ScaleFactor element_size,
+    Register element_count,
+    Register result,
+    Register result_end,
+    Register scratch,
+    Label* gc_required,
+    bool result_contains_top_on_entry) {
+  ASSERT(!result.is(result_end));
+
+  // Load address of new object into result.
+  LoadAllocationTopHelper(result,
+                          result_end,
+                          scratch,
+                          result_contains_top_on_entry);
+
+  // Calculate new top and bail out if new space is exhausted.
+  ExternalReference new_space_allocation_limit =
+      ExternalReference::new_space_allocation_limit_address();
+  lea(result_end, Operand(result, element_count, element_size, header_size));
+  cmp(result_end, Operand::StaticVariable(new_space_allocation_limit));
+  j(above, gc_required);
+
+  // Update allocation top.
+  UpdateAllocationTopHelper(result_end, scratch);
+}
+
+
+void MacroAssembler::AllocateObjectInNewSpace(
+    Register object_size,
+    Register result,
+    Register result_end,
+    Register scratch,
+    Label* gc_required,
+    bool result_contains_top_on_entry) {
+  ASSERT(!result.is(result_end));
+
+  // Load address of new object into result.
+  LoadAllocationTopHelper(result,
+                          result_end,
+                          scratch,
+                          result_contains_top_on_entry);
+
+
+  // Calculate new top and bail out if new space is exhausted.
+  ExternalReference new_space_allocation_limit =
+      ExternalReference::new_space_allocation_limit_address();
+  if (!object_size.is(result_end)) {
+    mov(result_end, object_size);
+  }
+  add(result_end, Operand(result));
+  cmp(result_end, Operand::StaticVariable(new_space_allocation_limit));
+  j(above, gc_required, not_taken);
+
+  // Update allocation top.
+  UpdateAllocationTopHelper(result_end, scratch);
+}
+
+
+void MacroAssembler::UndoAllocationInNewSpace(Register object) {
+  ExternalReference new_space_allocation_top =
+      ExternalReference::new_space_allocation_top_address();
+
+  // Make sure the object has no tag before resetting top.
+  and_(Operand(object), Immediate(~kHeapObjectTagMask));
+#ifdef DEBUG
+  cmp(object, Operand::StaticVariable(new_space_allocation_top));
+  Check(below, "Undo allocation of non allocated memory");
+#endif
+  mov(Operand::StaticVariable(new_space_allocation_top), object);
+}
+
+
 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 402 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