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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#if !defined(DART_PRECOMPILED_RUNTIME)
#include "vm/deferred_objects.h"
#include "vm/code_patcher.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/deopt_instructions.h"
#include "vm/flags.h"
#include "vm/object.h"
namespace dart {
DECLARE_FLAG(bool, trace_deoptimization);
DECLARE_FLAG(bool, trace_deoptimization_verbose);
void DeferredDouble::Materialize(DeoptContext* deopt_context) {
DoublePtr* double_slot = reinterpret_cast<DoublePtr*>(slot());
*double_slot = Double::New(value());
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr("materializing double at %" Px ": %g\n",
reinterpret_cast<uword>(slot()), value());
}
}
void DeferredMint::Materialize(DeoptContext* deopt_context) {
MintPtr* mint_slot = reinterpret_cast<MintPtr*>(slot());
ASSERT(!Smi::IsValid(value()));
Mint& mint = Mint::Handle();
mint ^= Integer::New(value());
*mint_slot = mint.ptr();
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr("materializing mint at %" Px ": %" Pd64 "\n",
reinterpret_cast<uword>(slot()), value());
}
}
void DeferredFloat32x4::Materialize(DeoptContext* deopt_context) {
Float32x4Ptr* float32x4_slot = reinterpret_cast<Float32x4Ptr*>(slot());
Float32x4Ptr raw_float32x4 = Float32x4::New(value());
*float32x4_slot = raw_float32x4;
if (FLAG_trace_deoptimization_verbose) {
float x = raw_float32x4->untag()->x();
float y = raw_float32x4->untag()->y();
float z = raw_float32x4->untag()->z();
float w = raw_float32x4->untag()->w();
OS::PrintErr("materializing Float32x4 at %" Px ": %g,%g,%g,%g\n",
reinterpret_cast<uword>(slot()), x, y, z, w);
}
}
void DeferredFloat64x2::Materialize(DeoptContext* deopt_context) {
Float64x2Ptr* float64x2_slot = reinterpret_cast<Float64x2Ptr*>(slot());
Float64x2Ptr raw_float64x2 = Float64x2::New(value());
*float64x2_slot = raw_float64x2;
if (FLAG_trace_deoptimization_verbose) {
double x = raw_float64x2->untag()->x();
double y = raw_float64x2->untag()->y();
OS::PrintErr("materializing Float64x2 at %" Px ": %g,%g\n",
reinterpret_cast<uword>(slot()), x, y);
}
}
void DeferredInt32x4::Materialize(DeoptContext* deopt_context) {
Int32x4Ptr* int32x4_slot = reinterpret_cast<Int32x4Ptr*>(slot());
Int32x4Ptr raw_int32x4 = Int32x4::New(value());
*int32x4_slot = raw_int32x4;
if (FLAG_trace_deoptimization_verbose) {
uint32_t x = raw_int32x4->untag()->x();
uint32_t y = raw_int32x4->untag()->y();
uint32_t z = raw_int32x4->untag()->z();
uint32_t w = raw_int32x4->untag()->w();
OS::PrintErr("materializing Int32x4 at %" Px ": %x,%x,%x,%x\n",
reinterpret_cast<uword>(slot()), x, y, z, w);
}
}
void DeferredObjectRef::Materialize(DeoptContext* deopt_context) {
DeferredObject* obj = deopt_context->GetDeferredObject(index());
*slot() = obj->object();
if (FLAG_trace_deoptimization_verbose) {
const Class& cls = Class::Handle(IsolateGroup::Current()->class_table()->At(
Object::Handle(obj->object()).GetClassId()));
OS::PrintErr("writing instance of class %s ref at %" Px ".\n",
cls.ToCString(), reinterpret_cast<uword>(slot()));
}
}
void DeferredRetAddr::Materialize(DeoptContext* deopt_context) {
Thread* thread = deopt_context->thread();
Zone* zone = deopt_context->zone();
Function& function = Function::Handle(zone);
function ^= deopt_context->ObjectAt(index_);
const Error& error =
Error::Handle(zone, Compiler::EnsureUnoptimizedCode(thread, function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
const Code& code = Code::Handle(zone, function.unoptimized_code());
uword continue_at_pc =
code.GetPcForDeoptId(deopt_id_, UntaggedPcDescriptors::kDeopt);
if (continue_at_pc == 0) {
FATAL2("Can't locate continuation PC for deoptid %" Pd " within %s\n",
deopt_id_, function.ToFullyQualifiedCString());
}
uword* dest_addr = reinterpret_cast<uword*>(slot());
*dest_addr = continue_at_pc;
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr("materializing return addr at 0x%" Px ": 0x%" Px "\n",
reinterpret_cast<uword>(slot()), continue_at_pc);
}
uword pc = code.GetPcForDeoptId(deopt_id_, UntaggedPcDescriptors::kIcCall);
if (pc != 0) {
// If the deoptimization happened at an IC call, update the IC data
// to avoid repeated deoptimization at the same site next time around.
// We cannot use CodePatcher::GetInstanceCallAt because the call site
// may have switched to from referencing an ICData to a target Code or
// MegamorphicCache.
ICData& ic_data = ICData::Handle(zone, function.FindICData(deopt_id_));
ic_data.AddDeoptReason(deopt_context->deopt_reason());
// Propagate the reason to all ICData-s with same deopt_id since
// only unoptimized-code ICData (IC calls) are propagated.
function.SetDeoptReasonForAll(ic_data.deopt_id(),
deopt_context->deopt_reason());
} else {
if (deopt_context->HasDeoptFlag(ICData::kHoisted)) {
// Prevent excessive deoptimization.
function.SetProhibitsHoistingCheckClass(true);
}
if (deopt_context->HasDeoptFlag(ICData::kGeneralized)) {
function.SetProhibitsBoundsCheckGeneralization(true);
}
}
}
void DeferredPcMarker::Materialize(DeoptContext* deopt_context) {
Thread* thread = deopt_context->thread();
Zone* zone = deopt_context->zone();
uword* dest_addr = reinterpret_cast<uword*>(slot());
Function& function = Function::Handle(zone);
function ^= deopt_context->ObjectAt(index_);
ASSERT(!function.IsNull());
SafepointWriteRwLocker ml(thread, thread->isolate_group()->program_lock());
const Error& error =
Error::Handle(zone, Compiler::EnsureUnoptimizedCode(thread, function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
const Code& code = Code::Handle(zone, function.unoptimized_code());
ASSERT(!code.IsNull());
ASSERT(function.HasCode());
*reinterpret_cast<ObjectPtr*>(dest_addr) = code.ptr();
if (FLAG_trace_deoptimization_verbose) {
THR_Print("materializing pc marker at 0x%" Px ": %s, %s\n",
reinterpret_cast<uword>(slot()), code.ToCString(),
function.ToCString());
}
// Increment the deoptimization counter. This effectively increments each
// function occurring in the optimized frame.
if (deopt_context->deoptimizing_code()) {
function.set_deoptimization_counter(function.deoptimization_counter() + 1);
}
if (FLAG_trace_deoptimization || FLAG_trace_deoptimization_verbose) {
THR_Print("Deoptimizing '%s' (count %d)\n",
function.ToFullyQualifiedCString(),
function.deoptimization_counter());
}
// Clear invocation counter so that hopefully the function gets reoptimized
// only after more feedback has been collected.
function.SetUsageCounter(0);
if (function.HasOptimizedCode()) {
function.SwitchToUnoptimizedCode();
}
}
void DeferredPp::Materialize(DeoptContext* deopt_context) {
Thread* thread = deopt_context->thread();
Zone* zone = deopt_context->zone();
Function& function = Function::Handle(zone);
function ^= deopt_context->ObjectAt(index_);
ASSERT(!function.IsNull());
const Error& error =
Error::Handle(zone, Compiler::EnsureUnoptimizedCode(thread, function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
const Code& code = Code::Handle(zone, function.unoptimized_code());
ASSERT(!code.IsNull());
ASSERT(code.GetObjectPool() != Object::null());
*slot() = code.GetObjectPool();
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr("materializing pp at 0x%" Px ": 0x%" Px "\n",
reinterpret_cast<uword>(slot()),
static_cast<uword>(code.GetObjectPool()));
}
}
ObjectPtr DeferredObject::object() {
if (object_ == NULL) {
Create();
}
return object_->ptr();
}
void DeferredObject::Create() {
if (object_ != NULL) {
return;
}
Class& cls = Class::Handle();
cls ^= GetClass();
switch (cls.id()) {
case kContextCid: {
const intptr_t num_variables =
Smi::Cast(Object::Handle(GetLength())).Value();
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr(
"materializing context of length %" Pd " (%" Px ", %" Pd " vars)\n",
num_variables, reinterpret_cast<uword>(args_), field_count_);
}
object_ = &Context::ZoneHandle(Context::New(num_variables));
} break;
case kArrayCid: {
const intptr_t num_elements =
Smi::Cast(Object::Handle(GetLength())).Value();
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr("materializing array of length %" Pd " (%" Px ", %" Pd
" elements)\n",
num_elements, reinterpret_cast<uword>(args_),
field_count_);
}
object_ = &Array::ZoneHandle(Array::New(num_elements));
} break;
default:
if (IsTypedDataClassId(cls.id())) {
const intptr_t num_elements =
Smi::Cast(Object::Handle(GetLength())).Value();
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr("materializing typed data cid %" Pd " of length %" Pd
" (%" Px ", %" Pd " elements)\n",
cls.id(), num_elements, reinterpret_cast<uword>(args_),
field_count_);
}
object_ =
&TypedData::ZoneHandle(TypedData::New(cls.id(), num_elements));
} else {
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr(
"materializing instance of %s (%" Px ", %" Pd " fields)\n",
cls.ToCString(), reinterpret_cast<uword>(args_), field_count_);
}
object_ = &Instance::ZoneHandle(Instance::New(cls));
}
}
}
static intptr_t ToContextIndex(intptr_t offset_in_bytes) {
intptr_t result = (offset_in_bytes - Context::variable_offset(0)) /
Context::kBytesPerElement;
ASSERT(result >= 0);
return result;
}
void DeferredObject::Fill() {
Create(); // Ensure instance is created.
Class& cls = Class::Handle();
cls ^= GetClass();
switch (cls.id()) {
case kContextCid: {
const Context& context = Context::Cast(*object_);
Smi& offset = Smi::Handle();
Object& value = Object::Handle();
for (intptr_t i = 0; i < field_count_; i++) {
offset ^= GetFieldOffset(i);
if (offset.Value() == Context::parent_offset()) {
// Copy parent.
Context& parent = Context::Handle();
parent ^= GetValue(i);
context.set_parent(parent);
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr(" ctx@parent (offset %" Pd ") <- %s\n",
offset.Value(), value.ToCString());
}
} else {
intptr_t context_index = ToContextIndex(offset.Value());
value = GetValue(i);
context.SetAt(context_index, value);
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr(" ctx@%" Pd " (offset %" Pd ") <- %s\n",
context_index, offset.Value(), value.ToCString());
}
}
}
} break;
case kArrayCid: {
const Array& array = Array::Cast(*object_);
Smi& offset = Smi::Handle();
Object& value = Object::Handle();
for (intptr_t i = 0; i < field_count_; i++) {
offset ^= GetFieldOffset(i);
if (offset.Value() == Array::type_arguments_offset()) {
TypeArguments& type_args = TypeArguments::Handle();
type_args ^= GetValue(i);
array.SetTypeArguments(type_args);
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr(" array@type_args (offset %" Pd ") <- %s\n",
offset.Value(), value.ToCString());
}
} else {
const intptr_t index = Array::index_at_offset(offset.Value());
value = GetValue(i);
array.SetAt(index, value);
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr(" array@%" Pd " (offset %" Pd ") <- %s\n", index,
offset.Value(), value.ToCString());
}
}
}
} break;
default:
if (IsTypedDataClassId(cls.id())) {
const TypedData& typed_data = TypedData::Cast(*object_);
Smi& offset = Smi::Handle();
Object& value = Object::Handle();
const auto cid = cls.id();
for (intptr_t i = 0; i < field_count_; i++) {
offset ^= GetFieldOffset(i);
const intptr_t element_offset = offset.Value();
value = GetValue(i);
switch (cid) {
case kTypedDataInt8ArrayCid:
typed_data.SetInt8(
element_offset,
static_cast<int8_t>(Integer::Cast(value).AsInt64Value()));
break;
case kTypedDataUint8ArrayCid:
case kTypedDataUint8ClampedArrayCid:
typed_data.SetUint8(
element_offset,
static_cast<uint8_t>(Integer::Cast(value).AsInt64Value()));
break;
case kTypedDataInt16ArrayCid:
typed_data.SetInt16(
element_offset,
static_cast<int16_t>(Integer::Cast(value).AsInt64Value()));
break;
case kTypedDataUint16ArrayCid:
typed_data.SetUint16(
element_offset,
static_cast<uint16_t>(Integer::Cast(value).AsInt64Value()));
break;
case kTypedDataInt32ArrayCid:
typed_data.SetInt32(
element_offset,
static_cast<int32_t>(Integer::Cast(value).AsInt64Value()));
break;
case kTypedDataUint32ArrayCid:
typed_data.SetUint32(
element_offset,
static_cast<uint32_t>(Integer::Cast(value).AsInt64Value()));
break;
case kTypedDataInt64ArrayCid:
typed_data.SetInt64(element_offset,
Integer::Cast(value).AsInt64Value());
break;
case kTypedDataUint64ArrayCid:
typed_data.SetUint64(
element_offset,
static_cast<uint64_t>(Integer::Cast(value).AsInt64Value()));
break;
case kTypedDataFloat32ArrayCid:
// Although element of Float32 array is represented with Double,
// it is already converted to 32-bit float via DoubleToFloat
// instruction before it was stored.
// Reinterpret double value as float to get the value back.
typed_data.SetFloat32(
element_offset,
bit_cast<float, uint32_t>(
static_cast<uint32_t>(bit_cast<uint64_t, double>(
Double::Cast(value).value()))));
break;
case kTypedDataFloat64ArrayCid:
typed_data.SetFloat64(element_offset,
Double::Cast(value).value());
break;
case kTypedDataFloat32x4ArrayCid:
typed_data.SetFloat32x4(element_offset,
Float32x4::Cast(value).value());
break;
case kTypedDataInt32x4ArrayCid:
typed_data.SetInt32x4(element_offset,
Int32x4::Cast(value).value());
break;
case kTypedDataFloat64x2ArrayCid:
typed_data.SetFloat64x2(element_offset,
Float64x2::Cast(value).value());
break;
default:
UNREACHABLE();
}
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr(" typed_data (offset %" Pd ") <- %s\n",
element_offset, value.ToCString());
}
}
} else {
const Instance& obj = Instance::Cast(*object_);
Smi& offset = Smi::Handle();
Field& field = Field::Handle();
Object& value = Object::Handle();
const Array& offset_map = Array::Handle(cls.OffsetToFieldMap());
for (intptr_t i = 0; i < field_count_; i++) {
offset ^= GetFieldOffset(i);
field ^= offset_map.At(offset.Value() / kCompressedWordSize);
value = GetValue(i);
ASSERT((value.ptr() != Object::sentinel().ptr()) ||
(!field.IsNull() && field.is_late()));
if (!field.IsNull() && (value.ptr() != Object::sentinel().ptr())) {
obj.SetField(field, value);
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr(" %s <- %s\n",
String::Handle(field.name()).ToCString(),
value.ToCString());
}
} else {
// In addition to the type arguments vector we can also have lazy
// materialization of e.g. _ByteDataView objects which don't have
// explicit fields in Dart (all accesses to the fields are done via
// recognized native methods).
ASSERT(offset.Value() < cls.host_instance_size());
obj.SetFieldAtOffset(offset.Value(), value);
if (FLAG_trace_deoptimization_verbose) {
OS::PrintErr(
" %s @ offset(%" Pd ") <- %s\n",
(field.IsNull() ? "null Field"
: String::Handle(field.name()).ToCString()),
offset.Value(), value.ToCString());
}
}
}
}
break;
}
}
} // namespace dart
#endif // !defined(DART_PRECOMPILED_RUNTIME)