MIPS: Turn ArrayPush into a stub specialized on the elements kind and argc.

src/mips/stub-cache-mips.cc

 // Copyright 2012 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 1538 matching lines @@
                            index.translate(holder), Representation::Tagged());
   GenerateJumpFunction(object, a1, &miss);
 
   HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(Code::FAST, name);
 }
 
 
-Handle<Code> CallStubCompiler::CompileArrayPushCall(
-    Handle<Object> object,
-    Handle<JSObject> holder,
-    Handle<Cell> cell,
-    Handle<JSFunction> function,
-    Handle<String> name,
-    Code::StubType type) {
-  // If object is not an array or is observed or sealed, bail out to regular
-  // call.
-  if (!object->IsJSArray() ||
-      !cell.is_null() ||
-      Handle<JSArray>::cast(object)->map()->is_observed() ||
-      !Handle<JSArray>::cast(object)->map()->is_extensible()) {
-    return Handle<Code>::null();
-  }
-
-  Label miss;
-  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
-  Register receiver = a0;
-  Register scratch = a1;
-
-  const int argc = arguments().immediate();
-
-  if (argc == 0) {
-    // Nothing to do, just return the length.
-    __ lw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
-    __ DropAndRet(argc + 1);
-  } else {
-    Label call_builtin;
-    if (argc == 1) {  // Otherwise fall through to call the builtin.
-      Label attempt_to_grow_elements, with_write_barrier, check_double;
-
-      Register elements = t2;
-      Register end_elements = t1;
-      // Get the elements array of the object.
-      __ lw(elements, FieldMemOperand(receiver, JSArray::kElementsOffset));
-
-      // Check that the elements are in fast mode and writable.
-      __ CheckMap(elements,
-                  scratch,
-                  Heap::kFixedArrayMapRootIndex,
-                  &check_double,
-                  DONT_DO_SMI_CHECK);
-
-      // Get the array's length into scratch and calculate new length.
-      __ lw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
-      STATIC_ASSERT(kSmiTagSize == 1);
-      STATIC_ASSERT(kSmiTag == 0);
-      __ Addu(scratch, scratch, Operand(Smi::FromInt(argc)));
-
-      // Get the elements' length.
-      __ lw(t0, FieldMemOperand(elements, FixedArray::kLengthOffset));
-
-      // Check if we could survive without allocation.
-      __ Branch(&attempt_to_grow_elements, gt, scratch, Operand(t0));
-
-      // Check if value is a smi.
-      __ lw(t0, MemOperand(sp, (argc - 1) * kPointerSize));
-      __ JumpIfNotSmi(t0, &with_write_barrier);
-
-      // Save new length.
-      __ sw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
-
-      // Store the value.
-      // We may need a register containing the address end_elements below,
-      // so write back the value in end_elements.
-      __ sll(end_elements, scratch, kPointerSizeLog2 - kSmiTagSize);
-      __ Addu(end_elements, elements, end_elements);
-      const int kEndElementsOffset =
-          FixedArray::kHeaderSize - kHeapObjectTag - argc * kPointerSize;
-      __ Addu(end_elements, end_elements, kEndElementsOffset);
-      __ sw(t0, MemOperand(end_elements));
-
-      // Check for a smi.
-      __ mov(v0, scratch);
-      __ DropAndRet(argc + 1);
-
-      __ bind(&check_double);
-
-      // Check that the elements are in fast mode and writable.
-      __ CheckMap(elements,
-                  scratch,
-                  Heap::kFixedDoubleArrayMapRootIndex,
-                  &call_builtin,
-                  DONT_DO_SMI_CHECK);
-
-      // Get the array's length into scratch and calculate new length.
-      __ lw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
-      STATIC_ASSERT(kSmiTagSize == 1);
-      STATIC_ASSERT(kSmiTag == 0);
-      __ Addu(scratch, scratch, Operand(Smi::FromInt(argc)));
-
-      // Get the elements' length.
-      __ lw(t0, FieldMemOperand(elements, FixedArray::kLengthOffset));
-
-      // Check if we could survive without allocation.
-      __ Branch(&call_builtin, gt, scratch, Operand(t0));
-
-      __ lw(t0, MemOperand(sp, (argc - 1) * kPointerSize));
-      __ StoreNumberToDoubleElements(
-          t0, scratch, elements, a3, t1, a2,
-          &call_builtin, argc * kDoubleSize);
-
-      // Save new length.
-      __ sw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
-
-      __ mov(v0, scratch);
-      __ DropAndRet(argc + 1);
-
-      __ bind(&with_write_barrier);
-
-      __ lw(a3, FieldMemOperand(receiver, HeapObject::kMapOffset));
-
-      if (FLAG_smi_only_arrays  && !FLAG_trace_elements_transitions) {
-        Label fast_object, not_fast_object;
-        __ CheckFastObjectElements(a3, t3, &not_fast_object);
-        __ jmp(&fast_object);
-        // In case of fast smi-only, convert to fast object, otherwise bail out.
-        __ bind(&not_fast_object);
-        __ CheckFastSmiElements(a3, t3, &call_builtin);
-
-        __ lw(t3, FieldMemOperand(t0, HeapObject::kMapOffset));
-        __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
-        __ Branch(&call_builtin, eq, t3, Operand(at));
-        // edx: receiver
-        // a3: map
-        Label try_holey_map;
-        __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS,
-                                               FAST_ELEMENTS,
-                                               a3,
-                                               t3,
-                                               &try_holey_map);
-        __ mov(a2, receiver);
-        ElementsTransitionGenerator::
-            GenerateMapChangeElementsTransition(masm(),
-                                                DONT_TRACK_ALLOCATION_SITE,
-                                                NULL);
-        __ jmp(&fast_object);
-
-        __ bind(&try_holey_map);
-        __ LoadTransitionedArrayMapConditional(FAST_HOLEY_SMI_ELEMENTS,
-                                               FAST_HOLEY_ELEMENTS,
-                                               a3,
-                                               t3,
-                                               &call_builtin);
-        __ mov(a2, receiver);
-        ElementsTransitionGenerator::
-            GenerateMapChangeElementsTransition(masm(),
-                                                DONT_TRACK_ALLOCATION_SITE,
-                                                NULL);
-        __ bind(&fast_object);
-      } else {
-        __ CheckFastObjectElements(a3, a3, &call_builtin);
-      }
-
-      // Save new length.
-      __ sw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
-
-      // Store the value.
-      // We may need a register containing the address end_elements below,
-      // so write back the value in end_elements.
-      __ sll(end_elements, scratch, kPointerSizeLog2 - kSmiTagSize);
-      __ Addu(end_elements, elements, end_elements);
-      __ Addu(end_elements, end_elements, kEndElementsOffset);
-      __ sw(t0, MemOperand(end_elements));
-
-      __ RecordWrite(elements,
-                     end_elements,
-                     t0,
-                     kRAHasNotBeenSaved,
-                     kDontSaveFPRegs,
-                     EMIT_REMEMBERED_SET,
-                     OMIT_SMI_CHECK);
-      __ mov(v0, scratch);
-      __ DropAndRet(argc + 1);
-
-      __ bind(&attempt_to_grow_elements);
-      // scratch: array's length + 1.
-      // t0: elements' length.
-
-      if (!FLAG_inline_new) {
-        __ Branch(&call_builtin);
-      }
-
-      __ lw(a2, MemOperand(sp, (argc - 1) * kPointerSize));
-      // Growing elements that are SMI-only requires special handling in case
-      // the new element is non-Smi. For now, delegate to the builtin.
-      Label no_fast_elements_check;
-      __ JumpIfSmi(a2, &no_fast_elements_check);
-      __ lw(t3, FieldMemOperand(receiver, HeapObject::kMapOffset));
-      __ CheckFastObjectElements(t3, t3, &call_builtin);
-      __ bind(&no_fast_elements_check);
-
-      ExternalReference new_space_allocation_top =
-          ExternalReference::new_space_allocation_top_address(isolate());
-      ExternalReference new_space_allocation_limit =
-          ExternalReference::new_space_allocation_limit_address(isolate());
-
-      const int kAllocationDelta = 4;
-      // Load top and check if it is the end of elements.
-      __ sll(end_elements, scratch, kPointerSizeLog2 - kSmiTagSize);
-      __ Addu(end_elements, elements, end_elements);
-      __ Addu(end_elements, end_elements, Operand(kEndElementsOffset));
-      __ li(t3, Operand(new_space_allocation_top));
-      __ lw(a3, MemOperand(t3));
-      __ Branch(&call_builtin, ne, end_elements, Operand(a3));
-
-      __ li(t5, Operand(new_space_allocation_limit));
-      __ lw(t5, MemOperand(t5));
-      __ Addu(a3, a3, Operand(kAllocationDelta * kPointerSize));
-      __ Branch(&call_builtin, hi, a3, Operand(t5));
-
-      // We fit and could grow elements.
-      // Update new_space_allocation_top.
-      __ sw(a3, MemOperand(t3));
-      // Push the argument.
-      __ sw(a2, MemOperand(end_elements));
-      // Fill the rest with holes.
-      __ LoadRoot(a3, Heap::kTheHoleValueRootIndex);
-      for (int i = 1; i < kAllocationDelta; i++) {
-        __ sw(a3, MemOperand(end_elements, i * kPointerSize));
-      }
-
-      // Update elements' and array's sizes.
-      __ sw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
-      __ Addu(t0, t0, Operand(Smi::FromInt(kAllocationDelta)));
-      __ sw(t0, FieldMemOperand(elements, FixedArray::kLengthOffset));
-
-      // Elements are in new space, so write barrier is not required.
-      __ mov(v0, scratch);
-      __ DropAndRet(argc + 1);
-    }
-    __ bind(&call_builtin);
-    __ TailCallExternalReference(
-        ExternalReference(Builtins::c_ArrayPush, isolate()), argc + 1, 1);
-  }
-
-  HandlerFrontendFooter(&miss);
-
-  // Return the generated code.
-  return GetCode(type, name);
-}
-
-
 Handle<Code> CallStubCompiler::CompileArrayPopCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
   // If object is not an array or is observed or sealed, bail out to regular
   // call.
   if (!object->IsJSArray() ||
@@ skipping 658 matching lines @@
   // -----------------------------------
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_Miss);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS