/
deopt_instructions.cc
1440 lines (1229 loc) · 48.8 KB
/
deopt_instructions.cc
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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/deopt_instructions.h"
#include "vm/code_patcher.h"
#include "vm/compiler/assembler/assembler.h"
#include "vm/compiler/assembler/disassembler.h"
#include "vm/compiler/backend/il.h"
#include "vm/compiler/backend/locations.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/parser.h"
#include "vm/stack_frame.h"
#include "vm/thread.h"
#include "vm/timeline.h"
namespace dart {
DEFINE_FLAG(bool,
compress_deopt_info,
true,
"Compress the size of the deoptimization info for optimized code.");
DECLARE_FLAG(bool, trace_deoptimization);
DECLARE_FLAG(bool, trace_deoptimization_verbose);
DeoptContext::DeoptContext(const StackFrame* frame,
const Code& code,
DestFrameOptions dest_options,
fpu_register_t* fpu_registers,
intptr_t* cpu_registers,
bool is_lazy_deopt,
bool deoptimizing_code)
: code_(code.ptr()),
object_pool_(code.GetObjectPool()),
deopt_info_(TypedData::null()),
dest_frame_is_allocated_(false),
dest_frame_(NULL),
dest_frame_size_(0),
source_frame_is_allocated_(false),
source_frame_(NULL),
source_frame_size_(0),
cpu_registers_(cpu_registers),
fpu_registers_(fpu_registers),
num_args_(0),
deopt_reason_(ICData::kDeoptUnknown),
deopt_flags_(0),
thread_(Thread::Current()),
deopt_start_micros_(0),
deferred_slots_(NULL),
deferred_objects_count_(0),
deferred_objects_(NULL),
is_lazy_deopt_(is_lazy_deopt),
deoptimizing_code_(deoptimizing_code) {
const TypedData& deopt_info = TypedData::Handle(
code.GetDeoptInfoAtPc(frame->pc(), &deopt_reason_, &deopt_flags_));
#if defined(DEBUG)
if (deopt_info.IsNull()) {
OS::PrintErr("Missing deopt info for pc %" Px "\n", frame->pc());
DisassembleToStdout formatter;
code.Disassemble(&formatter);
}
#endif
ASSERT(!deopt_info.IsNull());
deopt_info_ = deopt_info.ptr();
const Function& function = Function::Handle(code.function());
// Do not include incoming arguments if there are optional arguments
// (they are copied into local space at method entry).
num_args_ =
function.MakesCopyOfParameters() ? 0 : function.num_fixed_parameters();
// The fixed size section of the (fake) Dart frame called via a stub by the
// optimized function contains FP, PP (ARM only), PC-marker and
// return-address. This section is copied as well, so that its contained
// values can be updated before returning to the deoptimized function.
ASSERT(frame->fp() >= frame->sp());
const intptr_t frame_size = (frame->fp() - frame->sp()) / kWordSize;
source_frame_size_ = +kDartFrameFixedSize // For saved values below sp.
+ frame_size // For frame size incl. sp.
+ 1 // For fp.
+ kParamEndSlotFromFp // For saved values above fp.
+ num_args_; // For arguments.
source_frame_ = FrameBase(frame);
if (dest_options == kDestIsOriginalFrame) {
// Work from a copy of the source frame.
intptr_t* original_frame = source_frame_;
source_frame_ = new intptr_t[source_frame_size_];
ASSERT(source_frame_ != NULL);
for (intptr_t i = 0; i < source_frame_size_; i++) {
source_frame_[i] = original_frame[i];
}
source_frame_is_allocated_ = true;
}
caller_fp_ = GetSourceFp();
dest_frame_size_ = DeoptInfo::FrameSize(deopt_info);
if (dest_options == kDestIsAllocated) {
dest_frame_ = new intptr_t[dest_frame_size_];
ASSERT(source_frame_ != NULL);
for (intptr_t i = 0; i < dest_frame_size_; i++) {
dest_frame_[i] = 0;
}
dest_frame_is_allocated_ = true;
}
if (dest_options != kDestIsAllocated) {
// kDestIsAllocated is used by the debugger to generate a stack trace
// and does not signal a real deopt.
deopt_start_micros_ = OS::GetCurrentMonotonicMicros();
}
if (FLAG_trace_deoptimization || FLAG_trace_deoptimization_verbose) {
THR_Print(
"Deoptimizing (reason %d '%s') at "
"pc=%" Pp " fp=%" Pp " '%s' (count %d)\n",
deopt_reason(), DeoptReasonToCString(deopt_reason()), frame->pc(),
frame->fp(), function.ToFullyQualifiedCString(),
function.deoptimization_counter());
}
}
DeoptContext::~DeoptContext() {
// Delete memory for source frame and registers.
if (source_frame_is_allocated_) {
delete[] source_frame_;
}
source_frame_ = NULL;
delete[] fpu_registers_;
delete[] cpu_registers_;
fpu_registers_ = NULL;
cpu_registers_ = NULL;
if (dest_frame_is_allocated_) {
delete[] dest_frame_;
}
dest_frame_ = NULL;
// Delete all deferred objects.
for (intptr_t i = 0; i < deferred_objects_count_; i++) {
delete deferred_objects_[i];
}
delete[] deferred_objects_;
deferred_objects_ = NULL;
deferred_objects_count_ = 0;
#if defined(SUPPORT_TIMELINE)
if (deopt_start_micros_ != 0) {
TimelineStream* compiler_stream = Timeline::GetCompilerStream();
ASSERT(compiler_stream != NULL);
if (compiler_stream->enabled()) {
// Allocate all Dart objects needed before calling StartEvent,
// which blocks safe points until Complete is called.
const Code& code = Code::Handle(zone(), code_);
const Function& function = Function::Handle(zone(), code.function());
const String& function_name =
String::Handle(zone(), function.QualifiedScrubbedName());
const char* reason = DeoptReasonToCString(deopt_reason());
const int counter = function.deoptimization_counter();
TimelineEvent* timeline_event = compiler_stream->StartEvent();
if (timeline_event != NULL) {
timeline_event->Duration("Deoptimize", deopt_start_micros_,
OS::GetCurrentMonotonicMicros());
timeline_event->SetNumArguments(3);
timeline_event->CopyArgument(0, "function", function_name.ToCString());
timeline_event->CopyArgument(1, "reason", reason);
timeline_event->FormatArgument(2, "deoptimizationCount", "%d", counter);
timeline_event->Complete();
}
}
}
#endif // !PRODUCT
}
void DeoptContext::VisitObjectPointers(ObjectPointerVisitor* visitor) {
visitor->VisitPointer(reinterpret_cast<ObjectPtr*>(&code_));
visitor->VisitPointer(reinterpret_cast<ObjectPtr*>(&object_pool_));
visitor->VisitPointer(reinterpret_cast<ObjectPtr*>(&deopt_info_));
// Visit any object pointers on the destination stack.
if (dest_frame_is_allocated_) {
for (intptr_t i = 0; i < dest_frame_size_; i++) {
if (dest_frame_[i] != 0) {
visitor->VisitPointer(reinterpret_cast<ObjectPtr*>(&dest_frame_[i]));
}
}
}
}
intptr_t DeoptContext::DestStackAdjustment() const {
return dest_frame_size_ - kDartFrameFixedSize - num_args_
- 1 // For fp.
- kParamEndSlotFromFp;
}
intptr_t DeoptContext::GetSourceFp() const {
return source_frame_[source_frame_size_ - 1 - num_args_ -
kParamEndSlotFromFp + kSavedCallerFpSlotFromFp];
}
intptr_t DeoptContext::GetSourcePp() const {
return source_frame_[source_frame_size_ - 1 - num_args_ -
kParamEndSlotFromFp +
StackFrame::SavedCallerPpSlotFromFp()];
}
intptr_t DeoptContext::GetSourcePc() const {
return source_frame_[source_frame_size_ - num_args_ + kSavedPcSlotFromSp];
}
intptr_t DeoptContext::GetCallerFp() const {
return caller_fp_;
}
void DeoptContext::SetCallerFp(intptr_t caller_fp) {
caller_fp_ = caller_fp;
}
static bool IsObjectInstruction(DeoptInstr::Kind kind) {
switch (kind) {
case DeoptInstr::kConstant:
case DeoptInstr::kPp:
case DeoptInstr::kCallerPp:
case DeoptInstr::kMaterializedObjectRef:
case DeoptInstr::kFloat32x4:
case DeoptInstr::kInt32x4:
case DeoptInstr::kFloat64x2:
case DeoptInstr::kWord:
case DeoptInstr::kDouble:
case DeoptInstr::kMint:
case DeoptInstr::kMintPair:
case DeoptInstr::kInt32:
case DeoptInstr::kUint32:
return true;
case DeoptInstr::kRetAddress:
case DeoptInstr::kPcMarker:
case DeoptInstr::kCallerFp:
case DeoptInstr::kCallerPc:
return false;
case DeoptInstr::kMaterializeObject:
default:
// We should not encounter these instructions when filling stack slots.
UNREACHABLE();
return false;
}
UNREACHABLE();
return false;
}
void DeoptContext::FillDestFrame() {
const Code& code = Code::Handle(code_);
const TypedData& deopt_info = TypedData::Handle(deopt_info_);
GrowableArray<DeoptInstr*> deopt_instructions;
const Array& deopt_table = Array::Handle(code.deopt_info_array());
ASSERT(!deopt_table.IsNull());
DeoptInfo::Unpack(deopt_table, deopt_info, &deopt_instructions);
const intptr_t len = deopt_instructions.length();
const intptr_t frame_size = dest_frame_size_;
// For now, we never place non-objects in the deoptimized frame if
// the destination frame is a copy. This allows us to copy the
// deoptimized frame into an Array.
const bool objects_only = dest_frame_is_allocated_;
// All kMaterializeObject instructions are emitted before the instructions
// that describe stack frames. Skip them and defer materialization of
// objects until the frame is fully reconstructed and it is safe to perform
// GC.
// Arguments (class of the instance to allocate and field-value pairs) are
// described as part of the expression stack for the bottom-most deoptimized
// frame. They will be used during materialization and removed from the stack
// right before control switches to the unoptimized code.
const intptr_t num_materializations =
DeoptInfo::NumMaterializations(deopt_instructions);
PrepareForDeferredMaterialization(num_materializations);
for (intptr_t from_index = 0, to_index = kDartFrameFixedSize;
from_index < num_materializations; from_index++) {
const intptr_t field_count =
DeoptInstr::GetFieldCount(deopt_instructions[from_index]);
intptr_t* args = GetDestFrameAddressAt(to_index);
DeferredObject* obj = new DeferredObject(field_count, args);
SetDeferredObjectAt(from_index, obj);
to_index += obj->ArgumentCount();
}
// Populate stack frames.
for (intptr_t to_index = frame_size - 1, from_index = len - 1; to_index >= 0;
to_index--, from_index--) {
intptr_t* to_addr = GetDestFrameAddressAt(to_index);
DeoptInstr* instr = deopt_instructions[from_index];
if (!objects_only || IsObjectInstruction(instr->kind())) {
instr->Execute(this, to_addr);
} else {
*reinterpret_cast<ObjectPtr*>(to_addr) = Object::null();
}
}
if (FLAG_trace_deoptimization_verbose) {
for (intptr_t i = 0; i < frame_size; i++) {
intptr_t* to_addr = GetDestFrameAddressAt(i);
THR_Print("*%" Pd ". [%p] 0x%" Px " [%s]\n", i, to_addr, *to_addr,
deopt_instructions[i + (len - frame_size)]->ToCString());
}
}
}
const CatchEntryMoves* DeoptContext::ToCatchEntryMoves(intptr_t num_vars) {
const Code& code = Code::Handle(code_);
const TypedData& deopt_info = TypedData::Handle(deopt_info_);
GrowableArray<DeoptInstr*> deopt_instructions;
const Array& deopt_table = Array::Handle(code.deopt_info_array());
ASSERT(!deopt_table.IsNull());
DeoptInfo::Unpack(deopt_table, deopt_info, &deopt_instructions);
CatchEntryMoves* moves = CatchEntryMoves::Allocate(num_vars);
Function& function = Function::Handle(zone(), code.function());
intptr_t params =
function.MakesCopyOfParameters() ? 0 : function.num_fixed_parameters();
for (intptr_t i = 0; i < num_vars; i++) {
const intptr_t len = deopt_instructions.length();
intptr_t slot = i < params ? i
: i + kParamEndSlotFromFp -
runtime_frame_layout.first_local_from_fp;
DeoptInstr* instr = deopt_instructions[len - 1 - slot];
intptr_t dest_index = i - params;
moves->At(i) = instr->ToCatchEntryMove(this, dest_index);
}
return moves;
}
static void FillDeferredSlots(DeoptContext* deopt_context,
DeferredSlot** slot_list) {
DeferredSlot* slot = *slot_list;
*slot_list = NULL;
while (slot != NULL) {
DeferredSlot* current = slot;
slot = slot->next();
current->Materialize(deopt_context);
delete current;
}
}
// Materializes all deferred objects. Returns the total number of
// artificial arguments used during deoptimization.
intptr_t DeoptContext::MaterializeDeferredObjects() {
// Populate slots with references to all unboxed "primitive" values (doubles,
// mints, simd) and deferred objects. Deferred objects are only allocated
// but not filled with data. This is done later because deferred objects
// can references each other.
FillDeferredSlots(this, &deferred_slots_);
// Compute total number of artificial arguments used during deoptimization.
intptr_t deopt_arg_count = 0;
for (intptr_t i = 0; i < DeferredObjectsCount(); i++) {
GetDeferredObject(i)->Fill();
deopt_arg_count += GetDeferredObject(i)->ArgumentCount();
}
// Since this is the only step where GC can occur during deoptimization,
// use it to report the source line where deoptimization occurred.
if (FLAG_trace_deoptimization || FLAG_trace_deoptimization_verbose) {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* top_frame = iterator.NextFrame();
ASSERT(top_frame != NULL);
const Code& code = Code::Handle(top_frame->LookupDartCode());
const Function& top_function = Function::Handle(code.function());
const Script& script = Script::Handle(top_function.script());
const TokenPosition token_pos = code.GetTokenIndexOfPC(top_frame->pc());
THR_Print(" Function: %s\n", top_function.ToFullyQualifiedCString());
intptr_t line;
if (script.GetTokenLocation(token_pos, &line)) {
String& line_string = String::Handle(script.GetLine(line));
char line_buffer[80];
Utils::SNPrint(line_buffer, sizeof(line_buffer), " Line %" Pd ": '%s'",
line, line_string.ToCString());
THR_Print("%s\n", line_buffer);
}
THR_Print(" Deopt args: %" Pd "\n", deopt_arg_count);
}
return deopt_arg_count;
}
ArrayPtr DeoptContext::DestFrameAsArray() {
ASSERT(dest_frame_ != NULL && dest_frame_is_allocated_);
const Array& dest_array = Array::Handle(zone(), Array::New(dest_frame_size_));
PassiveObject& obj = PassiveObject::Handle(zone());
for (intptr_t i = 0; i < dest_frame_size_; i++) {
obj = static_cast<ObjectPtr>(dest_frame_[i]);
dest_array.SetAt(i, obj);
}
return dest_array.ptr();
}
// Deoptimization instruction creating return address using function and
// deopt-id stored at 'object_table_index'.
class DeoptRetAddressInstr : public DeoptInstr {
public:
DeoptRetAddressInstr(intptr_t object_table_index, intptr_t deopt_id)
: object_table_index_(object_table_index), deopt_id_(deopt_id) {
ASSERT(object_table_index >= 0);
ASSERT(deopt_id >= 0);
}
explicit DeoptRetAddressInstr(intptr_t source_index)
: object_table_index_(ObjectTableIndex::decode(source_index)),
deopt_id_(DeoptId::decode(source_index)) {}
virtual intptr_t source_index() const {
return ObjectTableIndex::encode(object_table_index_) |
DeoptId::encode(deopt_id_);
}
virtual DeoptInstr::Kind kind() const { return kRetAddress; }
virtual const char* ArgumentsToCString() const {
return Thread::Current()->zone()->PrintToString(
"%" Pd ", %" Pd "", object_table_index_, deopt_id_);
}
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
*dest_addr = Smi::RawValue(0);
deopt_context->DeferRetAddrMaterialization(object_table_index_, deopt_id_,
dest_addr);
}
intptr_t object_table_index() const { return object_table_index_; }
intptr_t deopt_id() const { return deopt_id_; }
private:
static const intptr_t kFieldWidth = kBitsPerWord / 2;
class ObjectTableIndex : public BitField<intptr_t, intptr_t, 0, kFieldWidth> {
};
class DeoptId
: public BitField<intptr_t, intptr_t, kFieldWidth, kFieldWidth> {};
const intptr_t object_table_index_;
const intptr_t deopt_id_;
DISALLOW_COPY_AND_ASSIGN(DeoptRetAddressInstr);
};
// Deoptimization instruction moving a constant stored at 'object_table_index'.
class DeoptConstantInstr : public DeoptInstr {
public:
explicit DeoptConstantInstr(intptr_t object_table_index)
: object_table_index_(object_table_index) {
ASSERT(object_table_index >= 0);
}
virtual intptr_t source_index() const { return object_table_index_; }
virtual DeoptInstr::Kind kind() const { return kConstant; }
virtual const char* ArgumentsToCString() const {
return Thread::Current()->zone()->PrintToString("%" Pd "",
object_table_index_);
}
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
const PassiveObject& obj = PassiveObject::Handle(
deopt_context->zone(), deopt_context->ObjectAt(object_table_index_));
*reinterpret_cast<ObjectPtr*>(dest_addr) = obj.ptr();
}
CatchEntryMove ToCatchEntryMove(DeoptContext* deopt_context,
intptr_t dest_slot) {
return CatchEntryMove::FromConstant(object_table_index_, dest_slot);
}
private:
const intptr_t object_table_index_;
DISALLOW_COPY_AND_ASSIGN(DeoptConstantInstr);
};
// Deoptimization instruction moving value from optimized frame at
// 'source_index' to specified slots in the unoptimized frame.
// 'source_index' represents the slot index of the frame (0 being
// first argument) and accounts for saved return address, frame
// pointer, pool pointer and pc marker.
// Deoptimization instruction moving a CPU register.
class DeoptWordInstr : public DeoptInstr {
public:
explicit DeoptWordInstr(intptr_t source_index) : source_(source_index) {}
explicit DeoptWordInstr(const CpuRegisterSource& source) : source_(source) {}
virtual intptr_t source_index() const { return source_.source_index(); }
virtual DeoptInstr::Kind kind() const { return kWord; }
virtual const char* ArgumentsToCString() const { return source_.ToCString(); }
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
*dest_addr = source_.Value<intptr_t>(deopt_context);
}
CatchEntryMove ToCatchEntryMove(DeoptContext* deopt_context,
intptr_t dest_slot) {
return CatchEntryMove::FromSlot(CatchEntryMove::SourceKind::kTaggedSlot,
source_.StackSlot(deopt_context),
dest_slot);
}
private:
const CpuRegisterSource source_;
DISALLOW_COPY_AND_ASSIGN(DeoptWordInstr);
};
class DeoptIntegerInstrBase : public DeoptInstr {
public:
DeoptIntegerInstrBase() {}
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
const int64_t value = GetValue(deopt_context);
if (Smi::IsValid(value)) {
*dest_addr = Smi::RawValue(static_cast<intptr_t>(value));
} else {
*dest_addr = Smi::RawValue(0);
deopt_context->DeferMintMaterialization(
value, reinterpret_cast<MintPtr*>(dest_addr));
}
}
virtual int64_t GetValue(DeoptContext* deopt_context) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(DeoptIntegerInstrBase);
};
class DeoptMintPairInstr : public DeoptIntegerInstrBase {
public:
explicit DeoptMintPairInstr(intptr_t source_index)
: DeoptIntegerInstrBase(),
lo_(LoRegister::decode(source_index)),
hi_(HiRegister::decode(source_index)) {}
DeoptMintPairInstr(const CpuRegisterSource& lo, const CpuRegisterSource& hi)
: DeoptIntegerInstrBase(), lo_(lo), hi_(hi) {}
virtual intptr_t source_index() const {
return LoRegister::encode(lo_.source_index()) |
HiRegister::encode(hi_.source_index());
}
virtual DeoptInstr::Kind kind() const { return kMintPair; }
virtual const char* ArgumentsToCString() const {
return Thread::Current()->zone()->PrintToString("%s,%s", lo_.ToCString(),
hi_.ToCString());
}
virtual int64_t GetValue(DeoptContext* deopt_context) {
return Utils::LowHighTo64Bits(lo_.Value<uint32_t>(deopt_context),
hi_.Value<int32_t>(deopt_context));
}
CatchEntryMove ToCatchEntryMove(DeoptContext* deopt_context,
intptr_t dest_slot) {
return CatchEntryMove::FromSlot(
CatchEntryMove::SourceKind::kInt64PairSlot,
CatchEntryMove::EncodePairSource(lo_.StackSlot(deopt_context),
hi_.StackSlot(deopt_context)),
dest_slot);
}
private:
static const intptr_t kFieldWidth = kBitsPerWord / 2;
class LoRegister : public BitField<intptr_t, intptr_t, 0, kFieldWidth> {};
class HiRegister
: public BitField<intptr_t, intptr_t, kFieldWidth, kFieldWidth> {};
const CpuRegisterSource lo_;
const CpuRegisterSource hi_;
DISALLOW_COPY_AND_ASSIGN(DeoptMintPairInstr);
};
template <DeoptInstr::Kind K, CatchEntryMove::SourceKind slot_kind, typename T>
class DeoptIntInstr : public DeoptIntegerInstrBase {
public:
explicit DeoptIntInstr(intptr_t source_index)
: DeoptIntegerInstrBase(), source_(source_index) {}
explicit DeoptIntInstr(const CpuRegisterSource& source)
: DeoptIntegerInstrBase(), source_(source) {}
virtual intptr_t source_index() const { return source_.source_index(); }
virtual DeoptInstr::Kind kind() const { return K; }
virtual const char* ArgumentsToCString() const { return source_.ToCString(); }
virtual int64_t GetValue(DeoptContext* deopt_context) {
return static_cast<int64_t>(source_.Value<T>(deopt_context));
}
CatchEntryMove ToCatchEntryMove(DeoptContext* deopt_context,
intptr_t dest_slot) {
return CatchEntryMove::FromSlot(slot_kind, source_.StackSlot(deopt_context),
dest_slot);
}
private:
const CpuRegisterSource source_;
DISALLOW_COPY_AND_ASSIGN(DeoptIntInstr);
};
typedef DeoptIntInstr<DeoptInstr::kUint32,
CatchEntryMove::SourceKind::kUint32Slot,
uint32_t>
DeoptUint32Instr;
typedef DeoptIntInstr<DeoptInstr::kInt32,
CatchEntryMove::SourceKind::kInt32Slot,
int32_t>
DeoptInt32Instr;
typedef DeoptIntInstr<DeoptInstr::kMint,
CatchEntryMove::SourceKind::kInt64Slot,
int64_t>
DeoptMintInstr;
template <DeoptInstr::Kind K,
CatchEntryMove::SourceKind slot_kind,
typename Type,
typename RawObjectType>
class DeoptFpuInstr : public DeoptInstr {
public:
explicit DeoptFpuInstr(intptr_t source_index) : source_(source_index) {}
explicit DeoptFpuInstr(const FpuRegisterSource& source) : source_(source) {}
virtual intptr_t source_index() const { return source_.source_index(); }
virtual DeoptInstr::Kind kind() const { return K; }
virtual const char* ArgumentsToCString() const { return source_.ToCString(); }
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
*dest_addr = Smi::RawValue(0);
deopt_context->DeferMaterialization(
source_.Value<Type>(deopt_context),
reinterpret_cast<RawObjectType*>(dest_addr));
}
CatchEntryMove ToCatchEntryMove(DeoptContext* deopt_context,
intptr_t dest_slot) {
return CatchEntryMove::FromSlot(slot_kind, source_.StackSlot(deopt_context),
dest_slot);
}
private:
const FpuRegisterSource source_;
DISALLOW_COPY_AND_ASSIGN(DeoptFpuInstr);
};
typedef DeoptFpuInstr<DeoptInstr::kDouble,
CatchEntryMove::SourceKind::kDoubleSlot,
double,
DoublePtr>
DeoptDoubleInstr;
// Simd128 types.
typedef DeoptFpuInstr<DeoptInstr::kFloat32x4,
CatchEntryMove::SourceKind::kFloat32x4Slot,
simd128_value_t,
Float32x4Ptr>
DeoptFloat32x4Instr;
typedef DeoptFpuInstr<DeoptInstr::kFloat64x2,
CatchEntryMove::SourceKind::kFloat64x2Slot,
simd128_value_t,
Float64x2Ptr>
DeoptFloat64x2Instr;
typedef DeoptFpuInstr<DeoptInstr::kInt32x4,
CatchEntryMove::SourceKind::kInt32x4Slot,
simd128_value_t,
Int32x4Ptr>
DeoptInt32x4Instr;
// Deoptimization instruction creating a PC marker for the code of
// function at 'object_table_index'.
class DeoptPcMarkerInstr : public DeoptInstr {
public:
explicit DeoptPcMarkerInstr(intptr_t object_table_index)
: object_table_index_(object_table_index) {
ASSERT(object_table_index >= 0);
}
virtual intptr_t source_index() const { return object_table_index_; }
virtual DeoptInstr::Kind kind() const { return kPcMarker; }
virtual const char* ArgumentsToCString() const {
return Thread::Current()->zone()->PrintToString("%" Pd "",
object_table_index_);
}
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
Function& function = Function::Handle(deopt_context->zone());
function ^= deopt_context->ObjectAt(object_table_index_);
if (function.IsNull()) {
*reinterpret_cast<ObjectPtr*>(dest_addr) =
deopt_context->is_lazy_deopt()
? StubCode::DeoptimizeLazyFromReturn().ptr()
: StubCode::Deoptimize().ptr();
return;
}
// We don't always have the Code object for the frame's corresponding
// unoptimized code as it may have been collected. Use a stub as the pc
// marker until we can recreate that Code object during deferred
// materialization to maintain the invariant that Dart frames always have
// a pc marker.
*reinterpret_cast<ObjectPtr*>(dest_addr) =
StubCode::FrameAwaitingMaterialization().ptr();
deopt_context->DeferPcMarkerMaterialization(object_table_index_, dest_addr);
}
private:
intptr_t object_table_index_;
DISALLOW_COPY_AND_ASSIGN(DeoptPcMarkerInstr);
};
// Deoptimization instruction creating a pool pointer for the code of
// function at 'object_table_index'.
class DeoptPpInstr : public DeoptInstr {
public:
explicit DeoptPpInstr(intptr_t object_table_index)
: object_table_index_(object_table_index) {
ASSERT(object_table_index >= 0);
}
virtual intptr_t source_index() const { return object_table_index_; }
virtual DeoptInstr::Kind kind() const { return kPp; }
virtual const char* ArgumentsToCString() const {
return Thread::Current()->zone()->PrintToString("%" Pd "",
object_table_index_);
}
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
*dest_addr = Smi::RawValue(0);
deopt_context->DeferPpMaterialization(
object_table_index_, reinterpret_cast<ObjectPtr*>(dest_addr));
}
private:
intptr_t object_table_index_;
DISALLOW_COPY_AND_ASSIGN(DeoptPpInstr);
};
// Deoptimization instruction copying the caller saved FP from optimized frame.
class DeoptCallerFpInstr : public DeoptInstr {
public:
DeoptCallerFpInstr() {}
virtual intptr_t source_index() const { return 0; }
virtual DeoptInstr::Kind kind() const { return kCallerFp; }
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
*dest_addr = deopt_context->GetCallerFp();
deopt_context->SetCallerFp(
reinterpret_cast<intptr_t>(dest_addr - kSavedCallerFpSlotFromFp));
}
private:
DISALLOW_COPY_AND_ASSIGN(DeoptCallerFpInstr);
};
// Deoptimization instruction copying the caller saved PP from optimized frame.
class DeoptCallerPpInstr : public DeoptInstr {
public:
DeoptCallerPpInstr() {}
virtual intptr_t source_index() const { return 0; }
virtual DeoptInstr::Kind kind() const { return kCallerPp; }
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
*dest_addr = deopt_context->GetSourcePp();
}
private:
DISALLOW_COPY_AND_ASSIGN(DeoptCallerPpInstr);
};
// Deoptimization instruction copying the caller return address from optimized
// frame.
class DeoptCallerPcInstr : public DeoptInstr {
public:
DeoptCallerPcInstr() {}
virtual intptr_t source_index() const { return 0; }
virtual DeoptInstr::Kind kind() const { return kCallerPc; }
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
*dest_addr = deopt_context->GetSourcePc();
}
private:
DISALLOW_COPY_AND_ASSIGN(DeoptCallerPcInstr);
};
// Write reference to a materialized object with the given index into the
// stack slot.
class DeoptMaterializedObjectRefInstr : public DeoptInstr {
public:
explicit DeoptMaterializedObjectRefInstr(intptr_t index) : index_(index) {
ASSERT(index >= 0);
}
virtual intptr_t source_index() const { return index_; }
virtual DeoptInstr::Kind kind() const { return kMaterializedObjectRef; }
virtual const char* ArgumentsToCString() const {
return Thread::Current()->zone()->PrintToString("#%" Pd "", index_);
}
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
*reinterpret_cast<SmiPtr*>(dest_addr) = Smi::New(0);
deopt_context->DeferMaterializedObjectRef(index_, dest_addr);
}
private:
intptr_t index_;
DISALLOW_COPY_AND_ASSIGN(DeoptMaterializedObjectRefInstr);
};
// Materialize object with the given number of fields.
// Arguments for materialization (class and field-value pairs) are pushed
// to the expression stack of the bottom-most frame.
class DeoptMaterializeObjectInstr : public DeoptInstr {
public:
explicit DeoptMaterializeObjectInstr(intptr_t field_count)
: field_count_(field_count) {
ASSERT(field_count >= 0);
}
virtual intptr_t source_index() const { return field_count_; }
virtual DeoptInstr::Kind kind() const { return kMaterializeObject; }
virtual const char* ArgumentsToCString() const {
return Thread::Current()->zone()->PrintToString("%" Pd "", field_count_);
}
void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
// This instructions are executed manually by the DeoptimizeWithDeoptInfo.
UNREACHABLE();
}
private:
intptr_t field_count_;
DISALLOW_COPY_AND_ASSIGN(DeoptMaterializeObjectInstr);
};
uword DeoptInstr::GetRetAddress(DeoptInstr* instr,
const ObjectPool& object_table,
Code* code) {
ASSERT(instr->kind() == kRetAddress);
DeoptRetAddressInstr* ret_address_instr =
static_cast<DeoptRetAddressInstr*>(instr);
// The following assert may trigger when displaying a backtrace
// from the simulator.
ASSERT(DeoptId::IsDeoptAfter(ret_address_instr->deopt_id()));
ASSERT(!object_table.IsNull());
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
Function& function = Function::Handle(zone);
function ^= object_table.ObjectAt(ret_address_instr->object_table_index());
ASSERT(code != NULL);
const Error& error =
Error::Handle(zone, Compiler::EnsureUnoptimizedCode(thread, function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
*code = function.unoptimized_code();
ASSERT(!code->IsNull());
uword res = code->GetPcForDeoptId(ret_address_instr->deopt_id(),
UntaggedPcDescriptors::kDeopt);
ASSERT(res != 0);
return res;
}
DeoptInstr* DeoptInstr::Create(intptr_t kind_as_int, intptr_t source_index) {
Kind kind = static_cast<Kind>(kind_as_int);
switch (kind) {
case kWord:
return new DeoptWordInstr(source_index);
case kDouble:
return new DeoptDoubleInstr(source_index);
case kMint:
return new DeoptMintInstr(source_index);
case kMintPair:
return new DeoptMintPairInstr(source_index);
case kInt32:
return new DeoptInt32Instr(source_index);
case kUint32:
return new DeoptUint32Instr(source_index);
case kFloat32x4:
return new DeoptFloat32x4Instr(source_index);
case kFloat64x2:
return new DeoptFloat64x2Instr(source_index);
case kInt32x4:
return new DeoptInt32x4Instr(source_index);
case kRetAddress:
return new DeoptRetAddressInstr(source_index);
case kConstant:
return new DeoptConstantInstr(source_index);
case kPcMarker:
return new DeoptPcMarkerInstr(source_index);
case kPp:
return new DeoptPpInstr(source_index);
case kCallerFp:
return new DeoptCallerFpInstr();
case kCallerPp:
return new DeoptCallerPpInstr();
case kCallerPc:
return new DeoptCallerPcInstr();
case kMaterializedObjectRef:
return new DeoptMaterializedObjectRefInstr(source_index);
case kMaterializeObject:
return new DeoptMaterializeObjectInstr(source_index);
}
UNREACHABLE();
return NULL;
}
const char* DeoptInstr::KindToCString(Kind kind) {
switch (kind) {
case kWord:
return "word";
case kDouble:
return "double";
case kMint:
case kMintPair:
return "mint";
case kInt32:
return "int32";
case kUint32:
return "uint32";
case kFloat32x4:
return "float32x4";
case kFloat64x2:
return "float64x2";
case kInt32x4:
return "int32x4";
case kRetAddress:
return "retaddr";
case kConstant:
return "const";
case kPcMarker:
return "pc";
case kPp:
return "pp";
case kCallerFp:
return "callerfp";
case kCallerPp:
return "callerpp";
case kCallerPc:
return "callerpc";
case kMaterializedObjectRef:
return "ref";
case kMaterializeObject:
return "mat";
}
UNREACHABLE();
return NULL;
}
class DeoptInfoBuilder::TrieNode : public ZoneAllocated {
public:
// Construct the root node representing the implicit "shared" terminator
// at the end of each deopt info.
TrieNode() : instruction_(NULL), info_number_(-1), children_(16) {}
// Construct a node representing a written instruction.
TrieNode(DeoptInstr* instruction, intptr_t info_number)
: instruction_(instruction), info_number_(info_number), children_(4) {}
intptr_t info_number() const { return info_number_; }
void AddChild(TrieNode* child) {
if (child != NULL) children_.Add(child);
}