MIPS: port all relevant commits since the new-gc was landed.

src/mips/ic-mips.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 1187 matching lines @@
 
 
 void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
                                    StrictModeFlag strict_mode) {
   // ---------- S t a t e --------------
   //  -- a0     : value
   //  -- a1     : key
   //  -- a2     : receiver
   //  -- ra     : return address
   // -----------------------------------
-
-  Label slow, fast, array, extra, exit;
+  Label slow, array, extra, check_if_double_array;
+  Label fast_object_with_map_check, fast_object_without_map_check;
+  Label fast_double_with_map_check, fast_double_without_map_check;
 
   // Register usage.
   Register value = a0;
   Register key = a1;
   Register receiver = a2;
   Register elements = a3;  // Elements array of the receiver.
-  // t0 is used as ip in the arm version.
-  // t3-t4 are used as temporaries.
+  Register elements_map = t2;
+  Register receiver_map = t3;
+  // t0 and t1 are used as general scratch registers.
 
   // Check that the key is a smi.
   __ JumpIfNotSmi(key, &slow);
   // Check that the object isn't a smi.
   __ JumpIfSmi(receiver, &slow);
-
   // Get the map of the object.
-  __ lw(t3, FieldMemOperand(receiver, HeapObject::kMapOffset));
+  __ lw(receiver_map, FieldMemOperand(receiver, HeapObject::kMapOffset));
   // Check that the receiver does not require access checks.  We need
   // to do this because this generic stub does not perform map checks.
-  __ lbu(t0, FieldMemOperand(t3, Map::kBitFieldOffset));
+  __ lbu(t0, FieldMemOperand(receiver_map, Map::kBitFieldOffset));
   __ And(t0, t0, Operand(1 << Map::kIsAccessCheckNeeded));
   __ Branch(&slow, ne, t0, Operand(zero_reg));
   // Check if the object is a JS array or not.
-  __ lbu(t3, FieldMemOperand(t3, Map::kInstanceTypeOffset));
-
-  __ Branch(&array, eq, t3, Operand(JS_ARRAY_TYPE));
+  __ lbu(t0, FieldMemOperand(receiver_map, Map::kInstanceTypeOffset));
+  __ Branch(&array, eq, t0, Operand(JS_ARRAY_TYPE));
   // Check that the object is some kind of JSObject.
-  __ Branch(&slow, lt, t3, Operand(FIRST_JS_RECEIVER_TYPE));
-  __ Branch(&slow, eq, t3, Operand(JS_PROXY_TYPE));
-  __ Branch(&slow, eq, t3, Operand(JS_FUNCTION_PROXY_TYPE));
+  __ Branch(&slow, lt, t0, Operand(FIRST_JS_OBJECT_TYPE));
 
   // Object case: Check key against length in the elements array.
   __ lw(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
-  // Check that the object is in fast mode and writable.
-  __ lw(t3, FieldMemOperand(elements, HeapObject::kMapOffset));
-  __ LoadRoot(t0, Heap::kFixedArrayMapRootIndex);
-  __ Branch(&slow, ne, t3, Operand(t0));
   // Check array bounds. Both the key and the length of FixedArray are smis.
   __ lw(t0, FieldMemOperand(elements, FixedArray::kLengthOffset));
-  __ Branch(&fast, lo, key, Operand(t0));
-  // Fall thru to slow if un-tagged index >= length.
+  __ Branch(&fast_object_with_map_check, lo, key, Operand(t0));
 
   // Slow case, handle jump to runtime.
   __ bind(&slow);
-
   // Entry registers are intact.
   // a0: value.
   // a1: key.
   // a2: receiver.
-
   GenerateRuntimeSetProperty(masm, strict_mode);
 
   // Extra capacity case: Check if there is extra capacity to
   // perform the store and update the length. Used for adding one
   // element to the array by writing to array[array.length].
-
   __ bind(&extra);
-  // Only support writing to array[array.length].
+  // Condition code from comparing key and array length is still available.
+  // Only support writing to writing to array[array.length].
   __ Branch(&slow, ne, key, Operand(t0));
   // Check for room in the elements backing store.
   // Both the key and the length of FixedArray are smis.
   __ lw(t0, FieldMemOperand(elements, FixedArray::kLengthOffset));
   __ Branch(&slow, hs, key, Operand(t0));
+  __ lw(elements_map, FieldMemOperand(elements, HeapObject::kMapOffset));
+  __ Branch(&check_if_double_array, ne, elements_map,
+      Operand(masm->isolate()->factory()->fixed_array_map()));
   // Calculate key + 1 as smi.
-  STATIC_ASSERT(0 == kSmiTag);
-  __ Addu(t3, key, Operand(Smi::FromInt(1)));
-  __ sw(t3, FieldMemOperand(receiver, JSArray::kLengthOffset));
-  __ Branch(&fast);
+  STATIC_ASSERT(kSmiTag == 0);
+  __ Addu(t0, key, Operand(Smi::FromInt(1)));
+  __ sw(t0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+  __ Branch(&fast_object_without_map_check);
 
+  __ bind(&check_if_double_array);
+  __ Branch(&slow, ne, elements_map,
+      Operand(masm->isolate()->factory()->fixed_double_array_map()));
+  // Add 1 to key, and go to common element store code for doubles.
+  STATIC_ASSERT(kSmiTag == 0);
+  __ Addu(t0, key, Operand(Smi::FromInt(1)));
+  __ sw(t0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+  __ jmp(&fast_double_without_map_check);
 
   // Array case: Get the length and the elements array from the JS
   // array. Check that the array is in fast mode (and writable); if it
   // is the length is always a smi.
-
   __ bind(&array);
   __ lw(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
-  __ lw(t3, FieldMemOperand(elements, HeapObject::kMapOffset));
-  __ LoadRoot(t0, Heap::kFixedArrayMapRootIndex);
-  __ Branch(&slow, ne, t3, Operand(t0));
 
   // Check the key against the length in the array.
   __ lw(t0, FieldMemOperand(receiver, JSArray::kLengthOffset));
   __ Branch(&extra, hs, key, Operand(t0));
   // Fall through to fast case.
 
-  __ bind(&fast);
+  __ bind(&fast_object_with_map_check);
   Register scratch_value = t0;
   Register address = t1;
-  // Fast case, store the value to the elements backing store.
+  __ lw(elements_map, FieldMemOperand(elements, HeapObject::kMapOffset));
+  __ Branch(&fast_double_with_map_check, ne, elements_map,
+      Operand(masm->isolate()->factory()->fixed_array_map()));
+  __ bind(&fast_object_without_map_check);
+  // Smi stores don't require further checks.
+  Label non_smi_value;
+  __ JumpIfNotSmi(value, &non_smi_value);
+  // It's irrelevant whether array is smi-only or not when writing a smi.
   __ Addu(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
   __ sll(scratch_value, key, kPointerSizeLog2 - kSmiTagSize);
   __ Addu(address, address, scratch_value);
   __ sw(value, MemOperand(address));
-  // Skip write barrier if the written value is a smi.
-  __ JumpIfSmi(value, &exit);
+  __ Ret(USE_DELAY_SLOT);
+  __ mov(v0, value);
 
+  __ bind(&non_smi_value);
+  // Escape to slow case when writing non-smi into smi-only array.
+  __ CheckFastObjectElements(receiver_map, scratch_value, &slow);
+  // Fast elements array, store the value to the elements backing store.
+  __ Addu(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ sll(scratch_value, key, kPointerSizeLog2 - kSmiTagSize);
+  __ Addu(address, address, scratch_value);
+  __ sw(value, MemOperand(address));
   // Update write barrier for the elements array address.
-  __ mov(scratch_value, value);  // Preserve the value which is returned.
+  __ mov(v0, value);  // Preserve the value which is returned.
   __ RecordWrite(elements,
                  address,
-                 scratch_value,
+                 value,
                  kRAHasNotBeenSaved,
                  kDontSaveFPRegs,
                  EMIT_REMEMBERED_SET,
                  OMIT_SMI_CHECK);
-  __ bind(&exit);
+  __ Ret();
 
-  __ mov(v0, a0);  // Return the value written.
-  __ Ret();
+  __ bind(&fast_double_with_map_check);
+  // Check for fast double array case. If this fails, call through to the
+  // runtime.
+  __ Branch(&slow, ne, elements_map,
+      Operand(masm->isolate()->factory()->fixed_double_array_map()));
+  __ bind(&fast_double_without_map_check);
+  __ StoreNumberToDoubleElements(value,
+                                 key,
+                                 receiver,
+                                 elements,
+                                 t0,
+                                 t1,
+                                 t2,
+                                 t3,
+                                 &slow);
+  __ Ret(USE_DELAY_SLOT);
+  __ mov(v0, value);
 }
 
 
 void KeyedLoadIC::GenerateIndexedInterceptor(MacroAssembler* masm) {
   // ---------- S t a t e --------------
   //  -- ra     : return address
   //  -- a0     : key
   //  -- a1     : receiver
   // -----------------------------------
   Label slow;
@@ skipping 310 matching lines @@
     Register reg = Register::from_code(Assembler::GetRs(instr_at_patch));
     patcher.masm()->andi(at, reg, kSmiTagMask);
     patcher.ChangeBranchCondition(eq);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS