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-rw-r--r--compiler/optimizing/code_generator_mips.cc76
1 files changed, 71 insertions, 5 deletions
diff --git a/compiler/optimizing/code_generator_mips.cc b/compiler/optimizing/code_generator_mips.cc
index c9dde7cc55..791e63265e 100644
--- a/compiler/optimizing/code_generator_mips.cc
+++ b/compiler/optimizing/code_generator_mips.cc
@@ -2073,6 +2073,11 @@ void InstructionCodeGeneratorMIPS::VisitArrayGet(HArrayGet* instruction) {
LOG(FATAL) << "Unreachable type " << instruction->GetType();
UNREACHABLE();
}
+
+ if (type == Primitive::kPrimNot) {
+ Register out = locations->Out().AsRegister<Register>();
+ __ MaybeUnpoisonHeapReference(out);
+ }
}
void LocationsBuilderMIPS::VisitArrayLength(HArrayLength* instruction) {
@@ -2200,7 +2205,31 @@ void InstructionCodeGeneratorMIPS::VisitArraySet(HArraySet* instruction) {
DCHECK(!needs_write_barrier);
} else {
Register value = value_location.AsRegister<Register>();
- __ StoreToOffset(kStoreWord, value, base_reg, data_offset, null_checker);
+ if (kPoisonHeapReferences && needs_write_barrier) {
+ // Note that in the case where `value` is a null reference,
+ // we do not enter this block, as a null reference does not
+ // need poisoning.
+ DCHECK_EQ(value_type, Primitive::kPrimNot);
+ // Use Sw() instead of StoreToOffset() in order to be able to
+ // hold the poisoned reference in AT and thus avoid allocating
+ // yet another temporary register.
+ if (index.IsConstant()) {
+ if (!IsInt<16>(static_cast<int32_t>(data_offset))) {
+ int16_t low = Low16Bits(data_offset);
+ uint32_t high = data_offset - low;
+ __ Addiu32(TMP, obj, high);
+ base_reg = TMP;
+ data_offset = low;
+ }
+ } else {
+ DCHECK(IsInt<16>(static_cast<int32_t>(data_offset)));
+ }
+ __ PoisonHeapReference(AT, value);
+ __ Sw(AT, base_reg, data_offset);
+ null_checker();
+ } else {
+ __ StoreToOffset(kStoreWord, value, base_reg, data_offset, null_checker);
+ }
if (needs_write_barrier) {
DCHECK_EQ(value_type, Primitive::kPrimNot);
codegen_->MarkGCCard(obj, value, instruction->GetValueCanBeNull());
@@ -2208,6 +2237,8 @@ void InstructionCodeGeneratorMIPS::VisitArraySet(HArraySet* instruction) {
}
} else {
DCHECK_EQ(value_type, Primitive::kPrimNot);
+ // Note: if heap poisoning is enabled, pAputObject takes care
+ // of poisoning the reference.
codegen_->InvokeRuntime(kQuickAputObject, instruction, instruction->GetDexPc());
CheckEntrypointTypes<kQuickAputObject, void, mirror::Array*, int32_t, mirror::Object*>();
}
@@ -2322,6 +2353,7 @@ void InstructionCodeGeneratorMIPS::VisitCheckCast(HCheckCast* instruction) {
__ Beqz(obj, slow_path->GetExitLabel());
// Compare the class of `obj` with `cls`.
__ LoadFromOffset(kLoadWord, obj_cls, obj, mirror::Object::ClassOffset().Int32Value());
+ __ MaybeUnpoisonHeapReference(obj_cls);
__ Bne(obj_cls, cls, slow_path->GetEntryLabel());
__ Bind(slow_path->GetExitLabel());
}
@@ -4958,6 +4990,9 @@ void InstructionCodeGeneratorMIPS::HandleFieldGet(HInstruction* instruction,
dst = locations->Out().AsRegister<Register>();
}
__ LoadFromOffset(load_type, dst, obj, offset, null_checker);
+ if (type == Primitive::kPrimNot) {
+ __ MaybeUnpoisonHeapReference(dst);
+ }
} else {
DCHECK(locations->Out().IsFpuRegister());
FRegister dst = locations->Out().AsFpuRegister<FRegister>();
@@ -5016,6 +5051,7 @@ void InstructionCodeGeneratorMIPS::HandleFieldSet(HInstruction* instruction,
StoreOperandType store_type = kStoreByte;
bool is_volatile = field_info.IsVolatile();
uint32_t offset = field_info.GetFieldOffset().Uint32Value();
+ bool needs_write_barrier = CodeGenerator::StoreNeedsWriteBarrier(type, instruction->InputAt(1));
auto null_checker = GetImplicitNullChecker(instruction);
switch (type) {
@@ -5089,7 +5125,16 @@ void InstructionCodeGeneratorMIPS::HandleFieldSet(HInstruction* instruction,
} else {
src = value_location.AsRegister<Register>();
}
- __ StoreToOffset(store_type, src, obj, offset, null_checker);
+ if (kPoisonHeapReferences && needs_write_barrier) {
+ // Note that in the case where `value` is a null reference,
+ // we do not enter this block, as a null reference does not
+ // need poisoning.
+ DCHECK_EQ(type, Primitive::kPrimNot);
+ __ PoisonHeapReference(TMP, src);
+ __ StoreToOffset(store_type, TMP, obj, offset, null_checker);
+ } else {
+ __ StoreToOffset(store_type, src, obj, offset, null_checker);
+ }
} else {
FRegister src = value_location.AsFpuRegister<FRegister>();
if (type == Primitive::kPrimFloat) {
@@ -5101,7 +5146,7 @@ void InstructionCodeGeneratorMIPS::HandleFieldSet(HInstruction* instruction,
}
// TODO: memory barriers?
- if (CodeGenerator::StoreNeedsWriteBarrier(type, instruction->InputAt(1))) {
+ if (needs_write_barrier) {
Register src = value_location.AsRegister<Register>();
codegen_->MarkGCCard(obj, src, value_can_be_null);
}
@@ -5173,6 +5218,7 @@ void InstructionCodeGeneratorMIPS::VisitInstanceOf(HInstanceOf* instruction) {
// Compare the class of `obj` with `cls`.
__ LoadFromOffset(kLoadWord, out, obj, mirror::Object::ClassOffset().Int32Value());
+ __ MaybeUnpoisonHeapReference(out);
if (instruction->IsExactCheck()) {
// Classes must be equal for the instanceof to succeed.
__ Xor(out, out, cls);
@@ -5239,6 +5285,14 @@ void InstructionCodeGeneratorMIPS::VisitInvokeInterface(HInvokeInterface* invoke
__ LoadFromOffset(kLoadWord, temp, receiver.AsRegister<Register>(), class_offset);
}
codegen_->MaybeRecordImplicitNullCheck(invoke);
+ // Instead of simply (possibly) unpoisoning `temp` here, we should
+ // emit a read barrier for the previous class reference load.
+ // However this is not required in practice, as this is an
+ // intermediate/temporary reference and because the current
+ // concurrent copying collector keeps the from-space memory
+ // intact/accessible until the end of the marking phase (the
+ // concurrent copying collector may not in the future).
+ __ MaybeUnpoisonHeapReference(temp);
__ LoadFromOffset(kLoadWord, temp, temp,
mirror::Class::ImtPtrOffset(kMipsPointerSize).Uint32Value());
uint32_t method_offset = static_cast<uint32_t>(ImTable::OffsetOfElement(
@@ -5562,6 +5616,14 @@ void CodeGeneratorMIPS::GenerateVirtualCall(HInvokeVirtual* invoke, Location tem
// temp = object->GetClass();
__ LoadFromOffset(kLoadWord, temp, receiver, class_offset);
MaybeRecordImplicitNullCheck(invoke);
+ // Instead of simply (possibly) unpoisoning `temp` here, we should
+ // emit a read barrier for the previous class reference load.
+ // However this is not required in practice, as this is an
+ // intermediate/temporary reference and because the current
+ // concurrent copying collector keeps the from-space memory
+ // intact/accessible until the end of the marking phase (the
+ // concurrent copying collector may not in the future).
+ __ MaybeUnpoisonHeapReference(temp);
// temp = temp->GetMethodAt(method_offset);
__ LoadFromOffset(kLoadWord, temp, temp, method_offset);
// T9 = temp->GetEntryPoint();
@@ -5692,7 +5754,7 @@ void InstructionCodeGeneratorMIPS::VisitLoadClass(HLoadClass* cls) NO_THREAD_SAF
codegen_->NewTypeBssEntryPatch(cls->GetDexFile(), cls->GetTypeIndex());
bool reordering = __ SetReorder(false);
codegen_->EmitPcRelativeAddressPlaceholderHigh(info, out, base_or_current_method_reg);
- __ LoadFromOffset(kLoadWord, out, out, /* placeholder */ 0x5678);
+ GenerateGcRootFieldLoad(cls, out_loc, out, /* placeholder */ 0x5678);
__ SetReorder(reordering);
generate_null_check = true;
break;
@@ -5837,7 +5899,7 @@ void InstructionCodeGeneratorMIPS::VisitLoadString(HLoadString* load) NO_THREAD_
codegen_->NewPcRelativeStringPatch(load->GetDexFile(), load->GetStringIndex());
bool reordering = __ SetReorder(false);
codegen_->EmitPcRelativeAddressPlaceholderHigh(info, out, base_or_current_method_reg);
- __ LoadFromOffset(kLoadWord, out, out, /* placeholder */ 0x5678);
+ GenerateGcRootFieldLoad(load, out_loc, out, /* placeholder */ 0x5678);
__ SetReorder(reordering);
SlowPathCodeMIPS* slow_path = new (GetGraph()->GetArena()) LoadStringSlowPathMIPS(load);
codegen_->AddSlowPath(slow_path);
@@ -6059,6 +6121,8 @@ void LocationsBuilderMIPS::VisitNewArray(HNewArray* instruction) {
}
void InstructionCodeGeneratorMIPS::VisitNewArray(HNewArray* instruction) {
+ // Note: if heap poisoning is enabled, the entry point takes care
+ // of poisoning the reference.
codegen_->InvokeRuntime(kQuickAllocArrayResolved, instruction, instruction->GetDexPc());
CheckEntrypointTypes<kQuickAllocArrayResolved, void*, mirror::Class*, int32_t>();
}
@@ -6076,6 +6140,8 @@ void LocationsBuilderMIPS::VisitNewInstance(HNewInstance* instruction) {
}
void InstructionCodeGeneratorMIPS::VisitNewInstance(HNewInstance* instruction) {
+ // Note: if heap poisoning is enabled, the entry point takes care
+ // of poisoning the reference.
if (instruction->IsStringAlloc()) {
// String is allocated through StringFactory. Call NewEmptyString entry point.
Register temp = instruction->GetLocations()->GetTemp(0).AsRegister<Register>();
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-04 10:13:08 +0000