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Unified Diff: src/arm64/code-stubs-arm64.cc

Issue 2523473002: [cleanup] Drop handwritten KeyedStoreIC code (Closed)
Patch Set: rebased Created 4 years, 1 month ago
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Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index c0d700ce0d8c4ae4bcb9082a74a126df52e527e7..e09b9ae6c97e146b6c6f41ceece83cbb03711afc 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -2980,234 +2980,6 @@ void CallICTrampolineStub::Generate(MacroAssembler* masm) {
__ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
}
-
-static void HandleArrayCases(MacroAssembler* masm, Register feedback,
- Register receiver_map, Register scratch1,
- Register scratch2, bool is_polymorphic,
- Label* miss) {
- // feedback initially contains the feedback array
- Label next_loop, prepare_next;
- Label load_smi_map, compare_map;
- Label start_polymorphic;
-
- Register cached_map = scratch1;
-
- __ Ldr(cached_map,
- FieldMemOperand(feedback, FixedArray::OffsetOfElementAt(0)));
- __ Ldr(cached_map, FieldMemOperand(cached_map, WeakCell::kValueOffset));
- __ Cmp(receiver_map, cached_map);
- __ B(ne, &start_polymorphic);
- // found, now call handler.
- Register handler = feedback;
- __ Ldr(handler, FieldMemOperand(feedback, FixedArray::OffsetOfElementAt(1)));
- __ Add(handler, handler, Code::kHeaderSize - kHeapObjectTag);
- __ Jump(feedback);
-
- Register length = scratch2;
- __ Bind(&start_polymorphic);
- __ Ldr(length, FieldMemOperand(feedback, FixedArray::kLengthOffset));
- if (!is_polymorphic) {
- __ Cmp(length, Operand(Smi::FromInt(2)));
- __ B(eq, miss);
- }
-
- Register too_far = length;
- Register pointer_reg = feedback;
-
- // +-----+------+------+-----+-----+ ... ----+
- // | map | len | wm0 | h0 | wm1 | hN |
- // +-----+------+------+-----+-----+ ... ----+
- // 0 1 2 len-1
- // ^ ^
- // | |
- // pointer_reg too_far
- // aka feedback scratch2
- // also need receiver_map
- // use cached_map (scratch1) to look in the weak map values.
- __ Add(too_far, feedback,
- Operand::UntagSmiAndScale(length, kPointerSizeLog2));
- __ Add(too_far, too_far, FixedArray::kHeaderSize - kHeapObjectTag);
- __ Add(pointer_reg, feedback,
- FixedArray::OffsetOfElementAt(2) - kHeapObjectTag);
-
- __ Bind(&next_loop);
- __ Ldr(cached_map, MemOperand(pointer_reg));
- __ Ldr(cached_map, FieldMemOperand(cached_map, WeakCell::kValueOffset));
- __ Cmp(receiver_map, cached_map);
- __ B(ne, &prepare_next);
- __ Ldr(handler, MemOperand(pointer_reg, kPointerSize));
- __ Add(handler, handler, Code::kHeaderSize - kHeapObjectTag);
- __ Jump(handler);
-
- __ Bind(&prepare_next);
- __ Add(pointer_reg, pointer_reg, kPointerSize * 2);
- __ Cmp(pointer_reg, too_far);
- __ B(lt, &next_loop);
-
- // We exhausted our array of map handler pairs.
- __ jmp(miss);
-}
-
-
-static void HandleMonomorphicCase(MacroAssembler* masm, Register receiver,
- Register receiver_map, Register feedback,
- Register vector, Register slot,
- Register scratch, Label* compare_map,
- Label* load_smi_map, Label* try_array) {
- __ JumpIfSmi(receiver, load_smi_map);
- __ Ldr(receiver_map, FieldMemOperand(receiver, HeapObject::kMapOffset));
- __ bind(compare_map);
- Register cached_map = scratch;
- // Move the weak map into the weak_cell register.
- __ Ldr(cached_map, FieldMemOperand(feedback, WeakCell::kValueOffset));
- __ Cmp(cached_map, receiver_map);
- __ B(ne, try_array);
-
- Register handler = feedback;
- __ Add(handler, vector, Operand::UntagSmiAndScale(slot, kPointerSizeLog2));
- __ Ldr(handler,
- FieldMemOperand(handler, FixedArray::kHeaderSize + kPointerSize));
- __ Add(handler, handler, Code::kHeaderSize - kHeapObjectTag);
- __ Jump(handler);
-}
-
-void KeyedStoreICTrampolineStub::Generate(MacroAssembler* masm) {
- __ EmitLoadTypeFeedbackVector(StoreWithVectorDescriptor::VectorRegister());
- KeyedStoreICStub stub(isolate(), state());
- stub.GenerateForTrampoline(masm);
-}
-
-void KeyedStoreICStub::Generate(MacroAssembler* masm) {
- GenerateImpl(masm, false);
-}
-
-void KeyedStoreICStub::GenerateForTrampoline(MacroAssembler* masm) {
- GenerateImpl(masm, true);
-}
-
-
-static void HandlePolymorphicStoreCase(MacroAssembler* masm, Register feedback,
- Register receiver_map, Register scratch1,
- Register scratch2, Label* miss) {
- // feedback initially contains the feedback array
- Label next_loop, prepare_next;
- Label start_polymorphic;
- Label transition_call;
-
- Register cached_map = scratch1;
- Register too_far = scratch2;
- Register pointer_reg = feedback;
-
- __ Ldr(too_far, FieldMemOperand(feedback, FixedArray::kLengthOffset));
-
- // +-----+------+------+-----+-----+-----+ ... ----+
- // | map | len | wm0 | wt0 | h0 | wm1 | hN |
- // +-----+------+------+-----+-----+ ----+ ... ----+
- // 0 1 2 len-1
- // ^ ^
- // | |
- // pointer_reg too_far
- // aka feedback scratch2
- // also need receiver_map
- // use cached_map (scratch1) to look in the weak map values.
- __ Add(too_far, feedback,
- Operand::UntagSmiAndScale(too_far, kPointerSizeLog2));
- __ Add(too_far, too_far, FixedArray::kHeaderSize - kHeapObjectTag);
- __ Add(pointer_reg, feedback,
- FixedArray::OffsetOfElementAt(0) - kHeapObjectTag);
-
- __ Bind(&next_loop);
- __ Ldr(cached_map, MemOperand(pointer_reg));
- __ Ldr(cached_map, FieldMemOperand(cached_map, WeakCell::kValueOffset));
- __ Cmp(receiver_map, cached_map);
- __ B(ne, &prepare_next);
- // Is it a transitioning store?
- __ Ldr(too_far, MemOperand(pointer_reg, kPointerSize));
- __ CompareRoot(too_far, Heap::kUndefinedValueRootIndex);
- __ B(ne, &transition_call);
-
- __ Ldr(pointer_reg, MemOperand(pointer_reg, kPointerSize * 2));
- __ Add(pointer_reg, pointer_reg, Code::kHeaderSize - kHeapObjectTag);
- __ Jump(pointer_reg);
-
- __ Bind(&transition_call);
- __ Ldr(too_far, FieldMemOperand(too_far, WeakCell::kValueOffset));
- __ JumpIfSmi(too_far, miss);
-
- __ Ldr(receiver_map, MemOperand(pointer_reg, kPointerSize * 2));
- // Load the map into the correct register.
- DCHECK(feedback.is(StoreTransitionDescriptor::MapRegister()));
- __ mov(feedback, too_far);
- __ Add(receiver_map, receiver_map, Code::kHeaderSize - kHeapObjectTag);
- __ Jump(receiver_map);
-
- __ Bind(&prepare_next);
- __ Add(pointer_reg, pointer_reg, kPointerSize * 3);
- __ Cmp(pointer_reg, too_far);
- __ B(lt, &next_loop);
-
- // We exhausted our array of map handler pairs.
- __ jmp(miss);
-}
-
-void KeyedStoreICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
- Register receiver = StoreWithVectorDescriptor::ReceiverRegister(); // x1
- Register key = StoreWithVectorDescriptor::NameRegister(); // x2
- Register vector = StoreWithVectorDescriptor::VectorRegister(); // x3
- Register slot = StoreWithVectorDescriptor::SlotRegister(); // x4
- DCHECK(StoreWithVectorDescriptor::ValueRegister().is(x0)); // x0
- Register feedback = x5;
- Register receiver_map = x6;
- Register scratch1 = x7;
-
- __ Add(feedback, vector, Operand::UntagSmiAndScale(slot, kPointerSizeLog2));
- __ Ldr(feedback, FieldMemOperand(feedback, FixedArray::kHeaderSize));
-
- // Try to quickly handle the monomorphic case without knowing for sure
- // if we have a weak cell in feedback. We do know it's safe to look
- // at WeakCell::kValueOffset.
- Label try_array, load_smi_map, compare_map;
- Label not_array, miss;
- HandleMonomorphicCase(masm, receiver, receiver_map, feedback, vector, slot,
- scratch1, &compare_map, &load_smi_map, &try_array);
-
- __ Bind(&try_array);
- // Is it a fixed array?
- __ Ldr(scratch1, FieldMemOperand(feedback, HeapObject::kMapOffset));
- __ JumpIfNotRoot(scratch1, Heap::kFixedArrayMapRootIndex, &not_array);
-
- // We have a polymorphic element handler.
- Label try_poly_name;
- HandlePolymorphicStoreCase(masm, feedback, receiver_map, scratch1, x8, &miss);
-
- __ Bind(&not_array);
- // Is it generic?
- __ JumpIfNotRoot(feedback, Heap::kmegamorphic_symbolRootIndex,
- &try_poly_name);
- Handle<Code> megamorphic_stub =
- KeyedStoreIC::ChooseMegamorphicStub(masm->isolate(), GetExtraICState());
- __ Jump(megamorphic_stub, RelocInfo::CODE_TARGET);
-
- __ Bind(&try_poly_name);
- // We might have a name in feedback, and a fixed array in the next slot.
- __ Cmp(key, feedback);
- __ B(ne, &miss);
- // If the name comparison succeeded, we know we have a fixed array with
- // at least one map/handler pair.
- __ Add(feedback, vector, Operand::UntagSmiAndScale(slot, kPointerSizeLog2));
- __ Ldr(feedback,
- FieldMemOperand(feedback, FixedArray::kHeaderSize + kPointerSize));
- HandleArrayCases(masm, feedback, receiver_map, scratch1, x8, false, &miss);
-
- __ Bind(&miss);
- KeyedStoreIC::GenerateMiss(masm);
-
- __ Bind(&load_smi_map);
- __ LoadRoot(receiver_map, Heap::kHeapNumberMapRootIndex);
- __ jmp(&compare_map);
-}
-
-
// The entry hook is a "BumpSystemStackPointer" instruction (sub), followed by
// a "Push lr" instruction, followed by a call.
static const unsigned int kProfileEntryHookCallSize =
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