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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.
#include "platform/globals.h"
#include "vm/globals.h" // Needed here to get TARGET_ARCH_IA32.
#if defined(TARGET_ARCH_IA32)
#include "vm/compiler/backend/il.h"
#include "vm/compiler/backend/flow_graph.h"
#include "vm/compiler/backend/flow_graph_compiler.h"
#include "vm/compiler/backend/locations.h"
#include "vm/compiler/backend/locations_helpers.h"
#include "vm/compiler/backend/range_analysis.h"
#include "vm/compiler/ffi/native_calling_convention.h"
#include "vm/compiler/frontend/flow_graph_builder.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/dart_entry.h"
#include "vm/instructions.h"
#include "vm/object_store.h"
#include "vm/parser.h"
#include "vm/stack_frame.h"
#include "vm/stub_code.h"
#include "vm/symbols.h"
#define __ compiler->assembler()->
#define Z (compiler->zone())
namespace dart {
// Generic summary for call instructions that have all arguments pushed
// on the stack and return the result in a fixed register EAX.
LocationSummary* Instruction::MakeCallSummary(Zone* zone,
const Instruction* instr,
LocationSummary* locs) {
// This is unused on ia32.
ASSERT(locs == nullptr);
const intptr_t kNumInputs = 0;
const intptr_t kNumTemps = 0;
LocationSummary* result = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kCall);
result->set_out(0, Location::RegisterLocation(EAX));
return result;
}
DEFINE_BACKEND(LoadIndexedUnsafe, (Register out, Register index)) {
ASSERT(instr->RequiredInputRepresentation(0) == kTagged); // It is a Smi.
ASSERT(instr->representation() == kTagged);
__ movl(out, compiler::Address(instr->base_reg(), index, TIMES_2,
instr->offset()));
ASSERT(kSmiTag == 0);
ASSERT(kSmiTagSize == 1);
}
DEFINE_BACKEND(StoreIndexedUnsafe,
(NoLocation, Register index, Register value)) {
ASSERT(instr->RequiredInputRepresentation(
StoreIndexedUnsafeInstr::kIndexPos) == kTagged); // It is a Smi.
__ movl(compiler::Address(instr->base_reg(), index, TIMES_2, instr->offset()),
value);
ASSERT(kSmiTag == 0);
ASSERT(kSmiTagSize == 1);
}
DEFINE_BACKEND(TailCall,
(NoLocation,
Fixed<Register, ARGS_DESC_REG>,
Temp<Register> temp)) {
__ LoadObject(CODE_REG, instr->code());
__ LeaveFrame(); // The arguments are still on the stack.
__ movl(temp, compiler::FieldAddress(CODE_REG, Code::entry_point_offset()));
__ jmp(temp);
}
LocationSummary* MemoryCopyInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 5;
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(kSrcPos, Location::RequiresRegister());
locs->set_in(kDestPos, Location::RegisterLocation(EDI));
locs->set_in(kSrcStartPos, Location::WritableRegister());
locs->set_in(kDestStartPos, Location::WritableRegister());
locs->set_in(kLengthPos, Location::RegisterLocation(ECX));
return locs;
}
void MemoryCopyInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
const Register src_reg = locs()->in(kSrcPos).reg();
const Register src_start_reg = locs()->in(kSrcStartPos).reg();
const Register dest_start_reg = locs()->in(kDestStartPos).reg();
// Save ESI which is THR.
__ pushl(ESI);
__ movl(ESI, src_reg);
EmitComputeStartPointer(compiler, src_cid_, src_start(), ESI, src_start_reg);
EmitComputeStartPointer(compiler, dest_cid_, dest_start(), EDI,
dest_start_reg);
if (element_size_ <= 4) {
__ SmiUntag(ECX);
} else if (element_size_ == 16) {
__ shll(ECX, compiler::Immediate(1));
}
switch (element_size_) {
case 1:
__ rep_movsb();
break;
case 2:
__ rep_movsw();
break;
case 4:
case 8:
case 16:
__ rep_movsl();
break;
}
// Restore THR.
__ popl(ESI);
}
void MemoryCopyInstr::EmitComputeStartPointer(FlowGraphCompiler* compiler,
classid_t array_cid,
Value* start,
Register array_reg,
Register start_reg) {
intptr_t offset;
if (IsTypedDataBaseClassId(array_cid)) {
__ movl(
array_reg,
compiler::FieldAddress(
array_reg, compiler::target::TypedDataBase::data_field_offset()));
offset = 0;
} else {
switch (array_cid) {
case kOneByteStringCid:
offset =
compiler::target::OneByteString::data_offset() - kHeapObjectTag;
break;
case kTwoByteStringCid:
offset =
compiler::target::TwoByteString::data_offset() - kHeapObjectTag;
break;
case kExternalOneByteStringCid:
__ movl(array_reg,
compiler::FieldAddress(array_reg,
compiler::target::ExternalOneByteString::
external_data_offset()));
offset = 0;
break;
case kExternalTwoByteStringCid:
__ movl(array_reg,
compiler::FieldAddress(array_reg,
compiler::target::ExternalTwoByteString::
external_data_offset()));
offset = 0;
break;
default:
UNREACHABLE();
break;
}
}
ScaleFactor scale;
switch (element_size_) {
case 1:
__ SmiUntag(start_reg);
scale = TIMES_1;
break;
case 2:
scale = TIMES_1;
break;
case 4:
scale = TIMES_2;
break;
case 8:
scale = TIMES_4;
break;
case 16:
scale = TIMES_8;
break;
default:
UNREACHABLE();
break;
}
__ leal(array_reg, compiler::Address(array_reg, start_reg, scale, offset));
}
LocationSummary* PushArgumentInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
ASSERT(representation() == kTagged);
locs->set_in(0, LocationAnyOrConstant(value()));
return locs;
}
void PushArgumentInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
// In SSA mode, we need an explicit push. Nothing to do in non-SSA mode
// where arguments are pushed by their definitions.
if (compiler->is_optimizing()) {
Location value = locs()->in(0);
if (value.IsRegister()) {
__ pushl(value.reg());
} else if (value.IsConstant()) {
__ PushObject(value.constant());
} else {
ASSERT(value.IsStackSlot());
__ pushl(LocationToStackSlotAddress(value));
}
}
}
LocationSummary* ReturnInstr::MakeLocationSummary(Zone* zone, bool opt) const {
const intptr_t kNumInputs = 1;
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
ASSERT(representation() == kTagged);
locs->set_in(0, Location::RegisterLocation(EAX));
return locs;
}
// Attempt optimized compilation at return instruction instead of at the entry.
// The entry needs to be patchable, no inlined objects are allowed in the area
// that will be overwritten by the patch instruction: a jump).
void ReturnInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
Register result = locs()->in(0).reg();
ASSERT(result == EAX);
if (!compiler->flow_graph().graph_entry()->NeedsFrame()) {
__ ret();
return;
}
#if defined(DEBUG)
__ Comment("Stack Check");
compiler::Label done;
const intptr_t fp_sp_dist =
(compiler::target::frame_layout.first_local_from_fp + 1 -
compiler->StackSize()) *
kWordSize;
ASSERT(fp_sp_dist <= 0);
__ movl(EDI, ESP);
__ subl(EDI, EBP);
__ cmpl(EDI, compiler::Immediate(fp_sp_dist));
__ j(EQUAL, &done, compiler::Assembler::kNearJump);
__ int3();
__ Bind(&done);
#endif
if (yield_index() != UntaggedPcDescriptors::kInvalidYieldIndex) {
compiler->EmitYieldPositionMetadata(source(), yield_index());
}
__ LeaveFrame();
__ ret();
}
// Keep in sync with NativeEntryInstr::EmitNativeCode.
void NativeReturnInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
EmitReturnMoves(compiler);
bool return_in_st0 = false;
if (marshaller_.Location(compiler::ffi::kResultIndex)
.payload_type()
.IsFloat()) {
ASSERT(locs()->in(0).IsFpuRegister() && locs()->in(0).fpu_reg() == XMM0);
return_in_st0 = true;
}
// Leave Dart frame.
__ LeaveFrame();
// EDI is the only sane choice for a temporary register here because:
//
// EDX is used for large return values.
// ESI == THR.
// Could be EBX or ECX, but that would make code below confusing.
const Register tmp = EDI;
// Pop dummy return address.
__ popl(tmp);
// Anything besides the return register(s!). Callee-saved registers will be
// restored later.
const Register vm_tag_reg = EBX;
const Register old_exit_frame_reg = ECX;
const Register old_exit_through_ffi_reg = tmp;
__ popl(old_exit_frame_reg);
__ popl(vm_tag_reg); /* old_exit_through_ffi, we still need to use tmp. */
// Restore top_resource.
__ popl(tmp);
__ movl(
compiler::Address(THR, compiler::target::Thread::top_resource_offset()),
tmp);
__ movl(old_exit_through_ffi_reg, vm_tag_reg);
__ popl(vm_tag_reg);
// This will reset the exit frame info to old_exit_frame_reg *before* entering
// the safepoint.
//
// If we were called by a trampoline, it will enter the safepoint on our
// behalf.
__ TransitionGeneratedToNative(
vm_tag_reg, old_exit_frame_reg, old_exit_through_ffi_reg,
/*enter_safepoint=*/!NativeCallbackTrampolines::Enabled());
// Move XMM0 into ST0 if needed.
if (return_in_st0) {
if (marshaller_.Location(compiler::ffi::kResultIndex)
.payload_type()
.SizeInBytes() == 8) {
__ movsd(compiler::Address(SPREG, -8), XMM0);
__ fldl(compiler::Address(SPREG, -8));
} else {
__ movss(compiler::Address(SPREG, -4), XMM0);
__ flds(compiler::Address(SPREG, -4));
}
}
// Restore C++ ABI callee-saved registers.
__ popl(EDI);
__ popl(ESI);
__ popl(EBX);
#if defined(TARGET_OS_FUCHSIA) && defined(USING_SHADOW_CALL_STACK)
#error Unimplemented
#endif
// Leave the entry frame.
__ LeaveFrame();
// We deal with `ret 4` for structs in the JIT callback trampolines.
__ ret();
}
LocationSummary* LoadLocalInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 0;
const intptr_t stack_index =
compiler::target::frame_layout.FrameSlotForVariable(&local());
return LocationSummary::Make(zone, kNumInputs,
Location::StackSlot(stack_index, FPREG),
LocationSummary::kNoCall);
}
void LoadLocalInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
ASSERT(!compiler->is_optimizing());
// Nothing to do.
}
LocationSummary* StoreLocalInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
return LocationSummary::Make(zone, kNumInputs, Location::SameAsFirstInput(),
LocationSummary::kNoCall);
}
void StoreLocalInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
Register value = locs()->in(0).reg();
Register result = locs()->out(0).reg();
ASSERT(result == value); // Assert that register assignment is correct.
__ movl(compiler::Address(
EBP, compiler::target::FrameOffsetInBytesForVariable(&local())),
value);
}
LocationSummary* ConstantInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 0;
return LocationSummary::Make(zone, kNumInputs,
compiler::Assembler::IsSafe(value())
? Location::Constant(this)
: Location::RequiresRegister(),
LocationSummary::kNoCall);
}
void ConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
// The register allocator drops constant definitions that have no uses.
Location out = locs()->out(0);
ASSERT(out.IsRegister() || out.IsConstant() || out.IsInvalid());
if (out.IsRegister()) {
Register result = out.reg();
__ LoadObjectSafely(result, value());
}
}
void ConstantInstr::EmitMoveToLocation(FlowGraphCompiler* compiler,
const Location& destination,
Register tmp) {
if (destination.IsRegister()) {
if (RepresentationUtils::IsUnboxedInteger(representation())) {
int64_t v;
const bool ok = compiler::HasIntegerValue(value_, &v);
RELEASE_ASSERT(ok);
if (value_.IsSmi() && RepresentationUtils::IsUnsigned(representation())) {
// If the value is negative, then the sign bit was preserved during
// Smi untagging, which means the resulting value may be unexpected.
ASSERT(v >= 0);
}
__ movl(destination.reg(), compiler::Immediate(v));
} else {
ASSERT(representation() == kTagged);
__ LoadObjectSafely(destination.reg(), value_);
}
} else if (destination.IsFpuRegister()) {
const double value_as_double = Double::Cast(value_).value();
uword addr = FindDoubleConstant(value_as_double);
if (addr == 0) {
__ pushl(EAX);
__ LoadObject(EAX, value_);
__ movsd(destination.fpu_reg(),
compiler::FieldAddress(EAX, Double::value_offset()));
__ popl(EAX);
} else if (Utils::DoublesBitEqual(value_as_double, 0.0)) {
__ xorps(destination.fpu_reg(), destination.fpu_reg());
} else {
__ movsd(destination.fpu_reg(), compiler::Address::Absolute(addr));
}
} else if (destination.IsDoubleStackSlot()) {
const double value_as_double = Double::Cast(value_).value();
uword addr = FindDoubleConstant(value_as_double);
if (addr == 0) {
__ pushl(EAX);
__ LoadObject(EAX, value_);
__ movsd(FpuTMP, compiler::FieldAddress(EAX, Double::value_offset()));
__ popl(EAX);
} else if (Utils::DoublesBitEqual(value_as_double, 0.0)) {
__ xorps(FpuTMP, FpuTMP);
} else {
__ movsd(FpuTMP, compiler::Address::Absolute(addr));
}
__ movsd(LocationToStackSlotAddress(destination), FpuTMP);
} else {
ASSERT(destination.IsStackSlot());
if (value_.IsSmi() &&
RepresentationUtils::IsUnboxedInteger(representation())) {
__ movl(LocationToStackSlotAddress(destination),
compiler::Immediate(Smi::Cast(value_).Value()));
} else {
if (compiler::Assembler::IsSafeSmi(value_) || value_.IsNull()) {
__ movl(LocationToStackSlotAddress(destination),
compiler::Immediate(static_cast<int32_t>(value_.ptr())));
} else {
__ pushl(EAX);
__ LoadObjectSafely(EAX, value_);
__ movl(LocationToStackSlotAddress(destination), EAX);
__ popl(EAX);
}
}
}
}
LocationSummary* UnboxedConstantInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const bool is_unboxed_int =
RepresentationUtils::IsUnboxedInteger(representation());
ASSERT(!is_unboxed_int || RepresentationUtils::ValueSize(representation()) <=
compiler::target::kWordSize);
const intptr_t kNumInputs = 0;
const intptr_t kNumTemps =
(constant_address() == 0) && !is_unboxed_int ? 1 : 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
if (representation() == kUnboxedDouble) {
locs->set_out(0, Location::RequiresFpuRegister());
} else {
ASSERT(is_unboxed_int);
locs->set_out(0, Location::RequiresRegister());
}
if (kNumTemps == 1) {
locs->set_temp(0, Location::RequiresRegister());
}
return locs;
}
void UnboxedConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
// The register allocator drops constant definitions that have no uses.
if (!locs()->out(0).IsInvalid()) {
EmitMoveToLocation(compiler, locs()->out(0));
}
}
LocationSummary* AssertAssignableInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 4;
const intptr_t kNumTemps = 0;
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kCall);
summary->set_in(kInstancePos,
Location::RegisterLocation(TypeTestABI::kInstanceReg));
summary->set_in(kDstTypePos, LocationFixedRegisterOrConstant(
dst_type(), TypeTestABI::kDstTypeReg));
summary->set_in(
kInstantiatorTAVPos,
Location::RegisterLocation(TypeTestABI::kInstantiatorTypeArgumentsReg));
summary->set_in(kFunctionTAVPos, Location::RegisterLocation(
TypeTestABI::kFunctionTypeArgumentsReg));
summary->set_out(0, Location::SameAsFirstInput());
return summary;
}
void AssertBooleanInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
ASSERT(locs()->always_calls());
auto object_store = compiler->isolate_group()->object_store();
const auto& assert_boolean_stub =
Code::ZoneHandle(compiler->zone(), object_store->assert_boolean_stub());
compiler::Label done;
__ testl(
AssertBooleanABI::kObjectReg,
compiler::Immediate(compiler::target::ObjectAlignment::kBoolVsNullMask));
__ j(NOT_ZERO, &done, compiler::Assembler::kNearJump);
compiler->GenerateStubCall(source(), assert_boolean_stub,
/*kind=*/UntaggedPcDescriptors::kOther, locs(),
deopt_id());
__ Bind(&done);
}
static Condition TokenKindToSmiCondition(Token::Kind kind) {
switch (kind) {
case Token::kEQ:
return EQUAL;
case Token::kNE:
return NOT_EQUAL;
case Token::kLT:
return LESS;
case Token::kGT:
return GREATER;
case Token::kLTE:
return LESS_EQUAL;
case Token::kGTE:
return GREATER_EQUAL;
default:
UNREACHABLE();
return OVERFLOW;
}
}
LocationSummary* EqualityCompareInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 2;
if (operation_cid() == kMintCid) {
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::Pair(Location::RequiresRegister(),
Location::RequiresRegister()));
locs->set_in(1, Location::Pair(Location::RequiresRegister(),
Location::RequiresRegister()));
locs->set_out(0, Location::RequiresRegister());
return locs;
}
if (operation_cid() == kDoubleCid) {
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::RequiresFpuRegister());
locs->set_in(1, Location::RequiresFpuRegister());
locs->set_out(0, Location::RequiresRegister());
return locs;
}
if (operation_cid() == kSmiCid) {
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, LocationRegisterOrConstant(left()));
// Only one input can be a constant operand. The case of two constant
// operands should be handled by constant propagation.
// Only right can be a stack slot.
locs->set_in(1, locs->in(0).IsConstant()
? Location::RequiresRegister()
: LocationRegisterOrConstant(right()));
locs->set_out(0, Location::RequiresRegister());
return locs;
}
UNREACHABLE();
return NULL;
}
static void LoadValueCid(FlowGraphCompiler* compiler,
Register value_cid_reg,
Register value_reg,
compiler::Label* value_is_smi = NULL) {
compiler::Label done;
if (value_is_smi == NULL) {
__ movl(value_cid_reg, compiler::Immediate(kSmiCid));
}
__ testl(value_reg, compiler::Immediate(kSmiTagMask));
if (value_is_smi == NULL) {
__ j(ZERO, &done, compiler::Assembler::kNearJump);
} else {
__ j(ZERO, value_is_smi);
}
__ LoadClassId(value_cid_reg, value_reg);
__ Bind(&done);
}
static Condition FlipCondition(Condition condition) {
switch (condition) {
case EQUAL:
return EQUAL;
case NOT_EQUAL:
return NOT_EQUAL;
case LESS:
return GREATER;
case LESS_EQUAL:
return GREATER_EQUAL;
case GREATER:
return LESS;
case GREATER_EQUAL:
return LESS_EQUAL;
case BELOW:
return ABOVE;
case BELOW_EQUAL:
return ABOVE_EQUAL;
case ABOVE:
return BELOW;
case ABOVE_EQUAL:
return BELOW_EQUAL;
default:
UNIMPLEMENTED();
return EQUAL;
}
}
static void EmitBranchOnCondition(FlowGraphCompiler* compiler,
Condition true_condition,
BranchLabels labels) {
if (labels.fall_through == labels.false_label) {
// If the next block is the false successor, fall through to it.
__ j(true_condition, labels.true_label);
} else {
// If the next block is not the false successor, branch to it.
Condition false_condition = InvertCondition(true_condition);
__ j(false_condition, labels.false_label);
// Fall through or jump to the true successor.
if (labels.fall_through != labels.true_label) {
__ jmp(labels.true_label);
}
}
}
static Condition EmitSmiComparisonOp(FlowGraphCompiler* compiler,
const LocationSummary& locs,
Token::Kind kind,
BranchLabels labels) {
Location left = locs.in(0);
Location right = locs.in(1);
ASSERT(!left.IsConstant() || !right.IsConstant());
Condition true_condition = TokenKindToSmiCondition(kind);
if (left.IsConstant()) {
__ CompareObject(right.reg(), left.constant());
true_condition = FlipCondition(true_condition);
} else if (right.IsConstant()) {
__ CompareObject(left.reg(), right.constant());
} else if (right.IsStackSlot()) {
__ cmpl(left.reg(), LocationToStackSlotAddress(right));
} else {
__ cmpl(left.reg(), right.reg());
}
return true_condition;
}
static Condition TokenKindToMintCondition(Token::Kind kind) {
switch (kind) {
case Token::kEQ:
return EQUAL;
case Token::kNE:
return NOT_EQUAL;
case Token::kLT:
return LESS;
case Token::kGT:
return GREATER;
case Token::kLTE:
return LESS_EQUAL;
case Token::kGTE:
return GREATER_EQUAL;
default:
UNREACHABLE();
return OVERFLOW;
}
}
static Condition EmitUnboxedMintEqualityOp(FlowGraphCompiler* compiler,
const LocationSummary& locs,
Token::Kind kind,
BranchLabels labels) {
ASSERT(Token::IsEqualityOperator(kind));
PairLocation* left_pair = locs.in(0).AsPairLocation();
Register left1 = left_pair->At(0).reg();
Register left2 = left_pair->At(1).reg();
PairLocation* right_pair = locs.in(1).AsPairLocation();
Register right1 = right_pair->At(0).reg();
Register right2 = right_pair->At(1).reg();
compiler::Label done;
// Compare lower.
__ cmpl(left1, right1);
__ j(NOT_EQUAL, &done);
// Lower is equal, compare upper.
__ cmpl(left2, right2);
__ Bind(&done);
Condition true_condition = TokenKindToMintCondition(kind);
return true_condition;
}
static Condition EmitUnboxedMintComparisonOp(FlowGraphCompiler* compiler,
const LocationSummary& locs,
Token::Kind kind,
BranchLabels labels) {
PairLocation* left_pair = locs.in(0).AsPairLocation();
Register left1 = left_pair->At(0).reg();
Register left2 = left_pair->At(1).reg();
PairLocation* right_pair = locs.in(1).AsPairLocation();
Register right1 = right_pair->At(0).reg();
Register right2 = right_pair->At(1).reg();
Condition hi_cond = OVERFLOW, lo_cond = OVERFLOW;
switch (kind) {
case Token::kLT:
hi_cond = LESS;
lo_cond = BELOW;
break;
case Token::kGT:
hi_cond = GREATER;
lo_cond = ABOVE;
break;
case Token::kLTE:
hi_cond = LESS;
lo_cond = BELOW_EQUAL;
break;
case Token::kGTE:
hi_cond = GREATER;
lo_cond = ABOVE_EQUAL;
break;
default:
break;
}
ASSERT(hi_cond != OVERFLOW && lo_cond != OVERFLOW);
// Compare upper halves first.
__ cmpl(left2, right2);
__ j(hi_cond, labels.true_label);
__ j(FlipCondition(hi_cond), labels.false_label);
// If upper is equal, compare lower half.
__ cmpl(left1, right1);
return lo_cond;
}
static Condition TokenKindToDoubleCondition(Token::Kind kind) {
switch (kind) {
case Token::kEQ:
return EQUAL;
case Token::kNE:
return NOT_EQUAL;
case Token::kLT:
return BELOW;
case Token::kGT:
return ABOVE;
case Token::kLTE:
return BELOW_EQUAL;
case Token::kGTE:
return ABOVE_EQUAL;
default:
UNREACHABLE();
return OVERFLOW;
}
}
static Condition EmitDoubleComparisonOp(FlowGraphCompiler* compiler,
const LocationSummary& locs,
Token::Kind kind,
BranchLabels labels) {
XmmRegister left = locs.in(0).fpu_reg();
XmmRegister right = locs.in(1).fpu_reg();
__ comisd(left, right);
Condition true_condition = TokenKindToDoubleCondition(kind);
compiler::Label* nan_result =
(true_condition == NOT_EQUAL) ? labels.true_label : labels.false_label;
__ j(PARITY_EVEN, nan_result);
return true_condition;
}
Condition EqualityCompareInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
BranchLabels labels) {
if (operation_cid() == kSmiCid) {
return EmitSmiComparisonOp(compiler, *locs(), kind(), labels);
} else if (operation_cid() == kMintCid) {
return EmitUnboxedMintEqualityOp(compiler, *locs(), kind(), labels);
} else {
ASSERT(operation_cid() == kDoubleCid);
return EmitDoubleComparisonOp(compiler, *locs(), kind(), labels);
}
}
void ComparisonInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
compiler::Label is_true, is_false;
BranchLabels labels = {&is_true, &is_false, &is_false};
Condition true_condition = EmitComparisonCode(compiler, labels);
if (true_condition != kInvalidCondition) {
EmitBranchOnCondition(compiler, true_condition, labels);
}
Register result = locs()->out(0).reg();
compiler::Label done;
__ Bind(&is_false);
__ LoadObject(result, Bool::False());
__ jmp(&done, compiler::Assembler::kNearJump);
__ Bind(&is_true);
__ LoadObject(result, Bool::True());
__ Bind(&done);
}
void ComparisonInstr::EmitBranchCode(FlowGraphCompiler* compiler,
BranchInstr* branch) {
BranchLabels labels = compiler->CreateBranchLabels(branch);
Condition true_condition = EmitComparisonCode(compiler, labels);
if (true_condition != kInvalidCondition) {
EmitBranchOnCondition(compiler, true_condition, labels);
}
}
LocationSummary* TestSmiInstr::MakeLocationSummary(Zone* zone, bool opt) const {
const intptr_t kNumInputs = 2;
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::RequiresRegister());
// Only one input can be a constant operand. The case of two constant
// operands should be handled by constant propagation.
locs->set_in(1, LocationRegisterOrConstant(right()));
return locs;
}
Condition TestSmiInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
BranchLabels labels) {
Register left = locs()->in(0).reg();
Location right = locs()->in(1);
if (right.IsConstant()) {
ASSERT(right.constant().IsSmi());
const int32_t imm = static_cast<int32_t>(right.constant().ptr());
__ testl(left, compiler::Immediate(imm));
} else {
__ testl(left, right.reg());
}
Condition true_condition = (kind() == Token::kNE) ? NOT_ZERO : ZERO;
return true_condition;
}
LocationSummary* TestCidsInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
const intptr_t kNumTemps = 1;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::RequiresRegister());
locs->set_temp(0, Location::RequiresRegister());
locs->set_out(0, Location::RequiresRegister());
return locs;
}
Condition TestCidsInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
BranchLabels labels) {
ASSERT((kind() == Token::kIS) || (kind() == Token::kISNOT));
Register val_reg = locs()->in(0).reg();
Register cid_reg = locs()->temp(0).reg();
compiler::Label* deopt =
CanDeoptimize()
? compiler->AddDeoptStub(deopt_id(), ICData::kDeoptTestCids,
licm_hoisted_ ? ICData::kHoisted : 0)
: NULL;
const intptr_t true_result = (kind() == Token::kIS) ? 1 : 0;
const ZoneGrowableArray<intptr_t>& data = cid_results();
ASSERT(data[0] == kSmiCid);
bool result = data[1] == true_result;
__ testl(val_reg, compiler::Immediate(kSmiTagMask));
__ j(ZERO, result ? labels.true_label : labels.false_label);
__ LoadClassId(cid_reg, val_reg);
for (intptr_t i = 2; i < data.length(); i += 2) {
const intptr_t test_cid = data[i];
ASSERT(test_cid != kSmiCid);
result = data[i + 1] == true_result;
__ cmpl(cid_reg, compiler::Immediate(test_cid));
__ j(EQUAL, result ? labels.true_label : labels.false_label);
}
// No match found, deoptimize or default action.
if (deopt == NULL) {
// If the cid is not in the list, jump to the opposite label from the cids
// that are in the list. These must be all the same (see asserts in the
// constructor).
compiler::Label* target = result ? labels.false_label : labels.true_label;
if (target != labels.fall_through) {
__ jmp(target);
}
} else {
__ jmp(deopt);
}
// Dummy result as this method already did the jump, there's no need
// for the caller to branch on a condition.
return kInvalidCondition;
}
LocationSummary* RelationalOpInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 2;
const intptr_t kNumTemps = 0;
if (operation_cid() == kMintCid) {
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::Pair(Location::RequiresRegister(),
Location::RequiresRegister()));
locs->set_in(1, Location::Pair(Location::RequiresRegister(),
Location::RequiresRegister()));
locs->set_out(0, Location::RequiresRegister());
return locs;
}
if (operation_cid() == kDoubleCid) {
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
summary->set_in(0, Location::RequiresFpuRegister());
summary->set_in(1, Location::RequiresFpuRegister());
summary->set_out(0, Location::RequiresRegister());
return summary;
}
ASSERT(operation_cid() == kSmiCid);
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
summary->set_in(0, LocationRegisterOrConstant(left()));
// Only one input can be a constant operand. The case of two constant
// operands should be handled by constant propagation.
summary->set_in(1, summary->in(0).IsConstant()
? Location::RequiresRegister()
: LocationRegisterOrConstant(right()));
summary->set_out(0, Location::RequiresRegister());
return summary;
}
Condition RelationalOpInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
BranchLabels labels) {
if (operation_cid() == kSmiCid) {
return EmitSmiComparisonOp(compiler, *locs(), kind(), labels);
} else if (operation_cid() == kMintCid) {
return EmitUnboxedMintComparisonOp(compiler, *locs(), kind(), labels);
} else {
ASSERT(operation_cid() == kDoubleCid);
return EmitDoubleComparisonOp(compiler, *locs(), kind(), labels);
}
}
void NativeCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
SetupNative();
Register result = locs()->out(0).reg();
const intptr_t argc_tag = NativeArguments::ComputeArgcTag(function());
// All arguments are already @ESP due to preceding PushArgument()s.
ASSERT(ArgumentCount() ==
function().NumParameters() + (function().IsGeneric() ? 1 : 0));
// Push the result place holder initialized to NULL.
__ PushObject(Object::null_object());
// Pass a pointer to the first argument in EAX.
__ leal(EAX, compiler::Address(ESP, ArgumentCount() * kWordSize));
__ movl(EDX, compiler::Immediate(argc_tag));
const Code* stub;
// There is no lazy-linking support on ia32.
ASSERT(!link_lazily());
if (is_bootstrap_native()) {
stub = &StubCode::CallBootstrapNative();
} else if (is_auto_scope()) {
stub = &StubCode::CallAutoScopeNative();
} else {
stub = &StubCode::CallNoScopeNative();
}
const compiler::ExternalLabel label(
reinterpret_cast<uword>(native_c_function()));
__ movl(ECX, compiler::Immediate(label.address()));
compiler->GenerateStubCall(source(), *stub, UntaggedPcDescriptors::kOther,
locs());
__ popl(result);
__ Drop(ArgumentCount()); // Drop the arguments.
}
void FfiCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
const Register saved_fp = locs()->temp(0).reg();
const Register temp = locs()->temp(1).reg();
const Register branch = locs()->in(TargetAddressIndex()).reg();
// Save frame pointer because we're going to update it when we enter the exit
// frame.
__ movl(saved_fp, FPREG);
// Make a space to put the return address.
__ pushl(compiler::Immediate(0));
// We need to create a dummy "exit frame". It will have a null code object.
__ LoadObject(CODE_REG, Object::null_object());
__ EnterDartFrame(marshaller_.RequiredStackSpaceInBytes());
// Align frame before entering C++ world.
if (OS::ActivationFrameAlignment() > 1) {
__ andl(SPREG, compiler::Immediate(~(OS::ActivationFrameAlignment() - 1)));
}
EmitParamMoves(compiler);
if (compiler::Assembler::EmittingComments()) {
__ Comment("Call");
}
// We need to copy a dummy return address up into the dummy stack frame so the
// stack walker will know which safepoint to use. Unlike X64, there's no
// PC-relative 'leaq' available, so we have do a trick with 'call'.
compiler::Label get_pc;
__ call(&get_pc);
compiler->EmitCallsiteMetadata(InstructionSource(), deopt_id(),
UntaggedPcDescriptors::Kind::kOther, locs());
__ Bind(&get_pc);
__ popl(temp);
__ movl(compiler::Address(FPREG, kSavedCallerPcSlotFromFp * kWordSize), temp);
ASSERT(!CanExecuteGeneratedCodeInSafepoint());
// We cannot trust that this code will be executable within a safepoint.
// Therefore we delegate the responsibility of entering/exiting the
// safepoint to a stub which in the VM isolate's heap, which will never lose
// execute permission.
__ movl(temp,
compiler::Address(
THR, compiler::target::Thread::
call_native_through_safepoint_entry_point_offset()));
// Calls EAX within a safepoint and clobbers EBX.
ASSERT(temp == EBX && branch == EAX);
__ call(temp);
// Restore the stack when a struct by value is returned into memory pointed
// to by a pointer that is passed into the function.
if (CallingConventions::kUsesRet4 &&
marshaller_.Location(compiler::ffi::kResultIndex).IsPointerToMemory()) {
// Callee uses `ret 4` instead of `ret` to return.
// See: https://c9x.me/x86/html/file_module_x86_id_280.html
// Caller does `sub esp, 4` immediately after return to balance stack.
__ subl(SPREG, compiler::Immediate(compiler::target::kWordSize));
}
// The x86 calling convention requires floating point values to be returned on
// the "floating-point stack" (aka. register ST0). We don't use the
// floating-point stack in Dart, so we need to move the return value back into
// an XMM register.
if (representation() == kUnboxedDouble) {
__ fstpl(compiler::Address(SPREG, -kDoubleSize));
__ movsd(XMM0, compiler::Address(SPREG, -kDoubleSize));
} else if (representation() == kUnboxedFloat) {
__ fstps(compiler::Address(SPREG, -kFloatSize));
__ movss(XMM0, compiler::Address(SPREG, -kFloatSize));
}
EmitReturnMoves(compiler);
// Leave dummy exit frame.
__ LeaveFrame();
// Instead of returning to the "fake" return address, we just pop it.
__ popl(temp);
}
// Keep in sync with NativeReturnInstr::EmitNativeCode.
void NativeEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
__ Bind(compiler->GetJumpLabel(this));
// Enter the entry frame.
__ EnterFrame(0);
// Save a space for the code object.
__ xorl(EAX, EAX);
__ pushl(EAX);
#if defined(TARGET_OS_FUCHSIA) && defined(USING_SHADOW_CALL_STACK)
#error Unimplemented
#endif
// Save ABI callee-saved registers.
__ pushl(EBX);
__ pushl(ESI);
__ pushl(EDI);
// Load the thread object.
//
// Create another frame to align the frame before continuing in "native" code.
// If we were called by a trampoline, it has already loaded the thread.
ASSERT(!FLAG_precompiled_mode); // No relocation for AOT linking.
if (!NativeCallbackTrampolines::Enabled()) {
__ EnterFrame(0);
__ ReserveAlignedFrameSpace(compiler::target::kWordSize);
__ movl(compiler::Address(SPREG, 0), compiler::Immediate(callback_id_));
__ movl(EAX, compiler::Immediate(reinterpret_cast<intptr_t>(
DLRT_GetThreadForNativeCallback)));
__ call(EAX);
__ movl(THR, EAX);
__ LeaveFrame();
}
// Save the current VMTag on the stack.
__ movl(ECX, compiler::Assembler::VMTagAddress());
__ pushl(ECX);
// Save top resource.
__ pushl(
compiler::Address(THR, compiler::target::Thread::top_resource_offset()));
__ movl(
compiler::Address(THR, compiler::target::Thread::top_resource_offset()),
compiler::Immediate(0));
__ pushl(compiler::Address(
THR, compiler::target::Thread::exit_through_ffi_offset()));
// Save top exit frame info. Stack walker expects it to be here.
__ pushl(compiler::Address(
THR, compiler::target::Thread::top_exit_frame_info_offset()));
// In debug mode, verify that we've pushed the top exit frame info at the
// correct offset from FP.
__ EmitEntryFrameVerification();
// Either DLRT_GetThreadForNativeCallback or the callback trampoline (caller)
// will leave the safepoint for us.
__ TransitionNativeToGenerated(EAX, /*exit_safepoint=*/false);
// Now that the safepoint has ended, we can hold Dart objects with bare hands.
// Load the code object.
__ movl(EAX, compiler::Address(
THR, compiler::target::Thread::callback_code_offset()));
__ movl(EAX, compiler::FieldAddress(
EAX, compiler::target::GrowableObjectArray::data_offset()));
__ movl(CODE_REG, compiler::FieldAddress(
EAX, compiler::target::Array::data_offset() +
callback_id_ * compiler::target::kWordSize));
// Put the code object in the reserved slot.
__ movl(compiler::Address(FPREG,
kPcMarkerSlotFromFp * compiler::target::kWordSize),
CODE_REG);
// Load a GC-safe value for the arguments descriptor (unused but tagged).
__ xorl(ARGS_DESC_REG, ARGS_DESC_REG);
// Push a dummy return address which suggests that we are inside of
// InvokeDartCodeStub. This is how the stack walker detects an entry frame.
__ movl(EAX,
compiler::Address(
THR, compiler::target::Thread::invoke_dart_code_stub_offset()));
__ pushl(compiler::FieldAddress(
EAX, compiler::target::Code::entry_point_offset()));
// Continue with Dart frame setup.
FunctionEntryInstr::EmitNativeCode(compiler);
}
static bool CanBeImmediateIndex(Value* value, intptr_t cid) {
ConstantInstr* constant = value->definition()->AsConstant();
if ((constant == NULL) ||
!compiler::Assembler::IsSafeSmi(constant->value())) {
return false;
}
const int64_t index = Smi::Cast(constant->value()).AsInt64Value();
const intptr_t scale = Instance::ElementSizeFor(cid);
const intptr_t offset = Instance::DataOffsetFor(cid);
const int64_t displacement = index * scale + offset;
return Utils::IsInt(32, displacement);
}
LocationSummary* OneByteStringFromCharCodeInstr::MakeLocationSummary(
Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
// TODO(fschneider): Allow immediate operands for the char code.
return LocationSummary::Make(zone, kNumInputs, Location::RequiresRegister(),
LocationSummary::kNoCall);
}
void OneByteStringFromCharCodeInstr::EmitNativeCode(
FlowGraphCompiler* compiler) {
Register char_code = locs()->in(0).reg();
Register result = locs()->out(0).reg();
__ movl(result, compiler::Immediate(
reinterpret_cast<uword>(Symbols::PredefinedAddress())));
__ movl(result,
compiler::Address(result, char_code,
TIMES_HALF_WORD_SIZE, // Char code is a smi.
Symbols::kNullCharCodeSymbolOffset * kWordSize));
}
LocationSummary* StringToCharCodeInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
return LocationSummary::Make(zone, kNumInputs, Location::RequiresRegister(),
LocationSummary::kNoCall);
}
void StringToCharCodeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
ASSERT(cid_ == kOneByteStringCid);
Register str = locs()->in(0).reg();
Register result = locs()->out(0).reg();
compiler::Label is_one, done;
__ movl(result, compiler::FieldAddress(str, String::length_offset()));
__ cmpl(result, compiler::Immediate(Smi::RawValue(1)));
__ j(EQUAL, &is_one, compiler::Assembler::kNearJump);
__ movl(result, compiler::Immediate(Smi::RawValue(-1)));
__ jmp(&done);
__ Bind(&is_one);
__ movzxb(result, compiler::FieldAddress(str, OneByteString::data_offset()));
__ SmiTag(result);
__ Bind(&done);
}
LocationSummary* StringInterpolateInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
const intptr_t kNumTemps = 0;
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kCall);
summary->set_in(0, Location::RegisterLocation(EAX));
summary->set_out(0, Location::RegisterLocation(EAX));
return summary;
}
void StringInterpolateInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
Register array = locs()->in(0).reg();
__ pushl(array);
const int kTypeArgsLen = 0;
const int kNumberOfArguments = 1;
constexpr int kSizeOfArguments = 1;
const Array& kNoArgumentNames = Object::null_array();
ArgumentsInfo args_info(kTypeArgsLen, kNumberOfArguments, kSizeOfArguments,
kNoArgumentNames);
compiler->GenerateStaticCall(deopt_id(), source(), CallFunction(), args_info,
locs(), ICData::Handle(), ICData::kStatic);
ASSERT(locs()->out(0).reg() == EAX);
}
LocationSummary* Utf8ScanInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 5;
const intptr_t kNumTemps = 0;
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
summary->set_in(0, Location::Any()); // decoder
summary->set_in(1, Location::WritableRegister()); // bytes
summary->set_in(2, Location::WritableRegister()); // start
summary->set_in(3, Location::WritableRegister()); // end
summary->set_in(4, Location::RequiresRegister()); // table
summary->set_out(0, Location::RequiresRegister());
return summary;
}
void Utf8ScanInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
const Register bytes_reg = locs()->in(1).reg();
const Register start_reg = locs()->in(2).reg();
const Register end_reg = locs()->in(3).reg();
const Register table_reg = locs()->in(4).reg();
const Register size_reg = locs()->out(0).reg();
const Register bytes_ptr_reg = start_reg;
const Register flags_reg = end_reg;
const Register temp_reg = bytes_reg;
const XmmRegister vector_reg = FpuTMP;
static const intptr_t kBytesEndTempOffset = 1 * compiler::target::kWordSize;
static const intptr_t kBytesEndMinus16TempOffset =
0 * compiler::target::kWordSize;
static const intptr_t kSizeMask = 0x03;
static const intptr_t kFlagsMask = 0x3C;
compiler::Label scan_ascii, ascii_loop, ascii_loop_in, nonascii_loop;
compiler::Label rest, rest_loop, rest_loop_in, done;
// Address of input bytes.
__ movl(bytes_reg,
compiler::FieldAddress(
bytes_reg, compiler::target::TypedDataBase::data_field_offset()));
// Pointers to start, end and end-16.
__ leal(bytes_ptr_reg, compiler::Address(bytes_reg, start_reg, TIMES_1, 0));
__ leal(temp_reg, compiler::Address(bytes_reg, end_reg, TIMES_1, 0));
__ pushl(temp_reg);
__ leal(temp_reg, compiler::Address(temp_reg, -16));
__ pushl(temp_reg);
// Initialize size and flags.
__ xorl(size_reg, size_reg);
__ xorl(flags_reg, flags_reg);
__ jmp(&scan_ascii, compiler::Assembler::kNearJump);
// Loop scanning through ASCII bytes one 16-byte vector at a time.
// While scanning, the size register contains the size as it was at the start
// of the current block of ASCII bytes, minus the address of the start of the
// block. After the block, the end address of the block is added to update the
// size to include the bytes in the block.
__ Bind(&ascii_loop);
__ addl(bytes_ptr_reg, compiler::Immediate(16));
__ Bind(&ascii_loop_in);
// Exit vectorized loop when there are less than 16 bytes left.
__ cmpl(bytes_ptr_reg, compiler::Address(ESP, kBytesEndMinus16TempOffset));
__ j(UNSIGNED_GREATER, &rest, compiler::Assembler::kNearJump);
// Find next non-ASCII byte within the next 16 bytes.
// Note: In principle, we should use MOVDQU here, since the loaded value is
// used as input to an integer instruction. In practice, according to Agner
// Fog, there is no penalty for using the wrong kind of load.
__ movups(vector_reg, compiler::Address(bytes_ptr_reg, 0));
__ pmovmskb(temp_reg, vector_reg);
__ bsfl(temp_reg, temp_reg);
__ j(EQUAL, &ascii_loop, compiler::Assembler::kNearJump);
// Point to non-ASCII byte and update size.
__ addl(bytes_ptr_reg, temp_reg);
__ addl(size_reg, bytes_ptr_reg);
// Read first non-ASCII byte.
__ movzxb(temp_reg, compiler::Address(bytes_ptr_reg, 0));
// Loop over block of non-ASCII bytes.
__ Bind(&nonascii_loop);
__ addl(bytes_ptr_reg, compiler::Immediate(1));
// Update size and flags based on byte value.
__ movzxb(temp_reg, compiler::FieldAddress(
table_reg, temp_reg, TIMES_1,
compiler::target::OneByteString::data_offset()));
__ orl(flags_reg, temp_reg);
__ andl(temp_reg, compiler::Immediate(kSizeMask));
__ addl(size_reg, temp_reg);
// Stop if end is reached.
__ cmpl(bytes_ptr_reg, compiler::Address(ESP, kBytesEndTempOffset));
__ j(UNSIGNED_GREATER_EQUAL, &done, compiler::Assembler::kNearJump);
// Go to ASCII scan if next byte is ASCII, otherwise loop.
__ movzxb(temp_reg, compiler::Address(bytes_ptr_reg, 0));
__ testl(temp_reg, compiler::Immediate(0x80));
__ j(NOT_EQUAL, &nonascii_loop, compiler::Assembler::kNearJump);
// Enter the ASCII scanning loop.
__ Bind(&scan_ascii);
__ subl(size_reg, bytes_ptr_reg);
__ jmp(&ascii_loop_in);
// Less than 16 bytes left. Process the remaining bytes individually.
__ Bind(&rest);
// Update size after ASCII scanning loop.
__ addl(size_reg, bytes_ptr_reg);
__ jmp(&rest_loop_in, compiler::Assembler::kNearJump);
__ Bind(&rest_loop);
// Read byte and increment pointer.
__ movzxb(temp_reg, compiler::Address(bytes_ptr_reg, 0));
__ addl(bytes_ptr_reg, compiler::Immediate(1));
// Update size and flags based on byte value.
__ movzxb(temp_reg, compiler::FieldAddress(
table_reg, temp_reg, TIMES_1,
compiler::target::OneByteString::data_offset()));
__ orl(flags_reg, temp_reg);
__ andl(temp_reg, compiler::Immediate(kSizeMask));
__ addl(size_reg, temp_reg);
// Stop if end is reached.
__ Bind(&rest_loop_in);
__ cmpl(bytes_ptr_reg, compiler::Address(ESP, kBytesEndTempOffset));
__ j(UNSIGNED_LESS, &rest_loop, compiler::Assembler::kNearJump);
__ Bind(&done);
// Pop temporaries.
__ addl(ESP, compiler::Immediate(2 * compiler::target::kWordSize));
// Write flags to field.
__ andl(flags_reg, compiler::Immediate(kFlagsMask));
if (!IsScanFlagsUnboxed()) {
__ SmiTag(flags_reg);
}
Register decoder_reg;
const Location decoder_location = locs()->in(0);
if (decoder_location.IsStackSlot()) {
__ movl(temp_reg, LocationToStackSlotAddress(decoder_location));
decoder_reg = temp_reg;
} else {
decoder_reg = decoder_location.reg();
}
const auto scan_flags_field_offset = scan_flags_field_.offset_in_bytes();
__ orl(compiler::FieldAddress(decoder_reg, scan_flags_field_offset),
flags_reg);
}
LocationSummary* LoadUntaggedInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
return LocationSummary::Make(zone, kNumInputs, Location::SameAsFirstInput(),
LocationSummary::kNoCall);
}
void LoadUntaggedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
Register obj = locs()->in(0).reg();
Register result = locs()->out(0).reg();
if (object()->definition()->representation() == kUntagged) {
__ movl(result, compiler::Address(obj, offset()));
} else {
ASSERT(object()->definition()->representation() == kTagged);
__ movl(result, compiler::FieldAddress(obj, offset()));
}
}
DEFINE_BACKEND(StoreUntagged, (NoLocation, Register obj, Register value)) {
__ movl(compiler::Address(obj, instr->offset_from_tagged()), value);
}
Representation LoadIndexedInstr::representation() const {
switch (class_id_) {
case kArrayCid:
case kImmutableArrayCid:
case kTypeArgumentsCid:
return kTagged;
case kOneByteStringCid:
case kTwoByteStringCid:
case kTypedDataInt8ArrayCid:
case kTypedDataInt16ArrayCid:
case kTypedDataUint8ArrayCid:
case kTypedDataUint8ClampedArrayCid:
case kTypedDataUint16ArrayCid:
case kExternalOneByteStringCid:
case kExternalTwoByteStringCid:
case kExternalTypedDataUint8ArrayCid:
case kExternalTypedDataUint8ClampedArrayCid:
return kUnboxedIntPtr;
case kTypedDataInt32ArrayCid:
return kUnboxedInt32;
case kTypedDataUint32ArrayCid:
return kUnboxedUint32;
case kTypedDataInt64ArrayCid:
case kTypedDataUint64ArrayCid:
return kUnboxedInt64;
case kTypedDataFloat32ArrayCid:
case kTypedDataFloat64ArrayCid:
return kUnboxedDouble;
case kTypedDataFloat32x4ArrayCid:
return kUnboxedFloat32x4;
case kTypedDataInt32x4ArrayCid:
return kUnboxedInt32x4;
case kTypedDataFloat64x2ArrayCid:
return kUnboxedFloat64x2;
default:
UNIMPLEMENTED();
return kTagged;
}
}
LocationSummary* LoadIndexedInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 2;
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::RequiresRegister());
if (CanBeImmediateIndex(index(), class_id())) {
// CanBeImmediateIndex must return false for unsafe smis.
locs->set_in(1, Location::Constant(index()->definition()->AsConstant()));
} else {
// The index is either untagged (element size == 1) or a smi (for all
// element sizes > 1).
locs->set_in(1, (index_scale() == 1) ? Location::WritableRegister()
: Location::RequiresRegister());
}
if ((representation() == kUnboxedDouble) ||
(representation() == kUnboxedFloat32x4) ||
(representation() == kUnboxedInt32x4) ||
(representation() == kUnboxedFloat64x2)) {
locs->set_out(0, Location::RequiresFpuRegister());
} else if (representation() == kUnboxedInt64) {
ASSERT(class_id() == kTypedDataInt64ArrayCid ||
class_id() == kTypedDataUint64ArrayCid);
locs->set_out(0, Location::Pair(Location::RequiresRegister(),
Location::RequiresRegister()));
} else {
locs->set_out(0, Location::RequiresRegister());
}
return locs;
}
void LoadIndexedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
// The array register points to the backing store for external arrays.
const Register array = locs()->in(0).reg();
const Location index = locs()->in(1);
compiler::Address element_address =
index.IsRegister() ? compiler::Assembler::ElementAddressForRegIndex(
IsExternal(), class_id(), index_scale(),
index_unboxed_, array, index.reg())
: compiler::Assembler::ElementAddressForIntIndex(
IsExternal(), class_id(), index_scale(), array,
Smi::Cast(index.constant()).Value());
if (index_scale() == 1 && !index_unboxed_) {
if (index.IsRegister()) {
__ SmiUntag(index.reg());
} else {
ASSERT(index.IsConstant());
}
}
if ((representation() == kUnboxedDouble) ||
(representation() == kUnboxedFloat32x4) ||
(representation() == kUnboxedInt32x4) ||
(representation() == kUnboxedFloat64x2)) {
XmmRegister result = locs()->out(0).fpu_reg();
switch (class_id()) {
case kTypedDataFloat32ArrayCid:
__ movss(result, element_address);
break;
case kTypedDataFloat64ArrayCid:
__ movsd(result, element_address);
break;
case kTypedDataInt32x4ArrayCid:
case kTypedDataFloat32x4ArrayCid:
case kTypedDataFloat64x2ArrayCid:
__ movups(result, element_address);
break;
default:
UNREACHABLE();
}
return;
}
switch (class_id()) {
case kTypedDataInt32ArrayCid: {
const Register result = locs()->out(0).reg();
ASSERT(representation() == kUnboxedInt32);
__ movl(result, element_address);
break;
}
case kTypedDataUint32ArrayCid: {
const Register result = locs()->out(0).reg();
ASSERT(representation() == kUnboxedUint32);
__ movl(result, element_address);
break;
}
case kTypedDataInt64ArrayCid:
case kTypedDataUint64ArrayCid: {
ASSERT(representation() == kUnboxedInt64);
ASSERT(locs()->out(0).IsPairLocation());
PairLocation* result_pair = locs()->out(0).AsPairLocation();
const Register result_lo = result_pair->At(0).reg();
const Register result_hi = result_pair->At(1).reg();
ASSERT(class_id() == kTypedDataInt64ArrayCid ||
class_id() == kTypedDataUint64ArrayCid);
__ movl(result_lo, element_address);
element_address =
index.IsRegister()
? compiler::Assembler::ElementAddressForRegIndex(
IsExternal(), class_id(), index_scale(), index_unboxed_,
array, index.reg(), kWordSize)
: compiler::Assembler::ElementAddressForIntIndex(
IsExternal(), class_id(), index_scale(), array,
Smi::Cast(index.constant()).Value(), kWordSize);
__ movl(result_hi, element_address);
break;
}
case kTypedDataInt8ArrayCid: {
const Register result = locs()->out(0).reg();
ASSERT(representation() == kUnboxedIntPtr);
ASSERT(index_scale() == 1);
__ movsxb(result, element_address);
break;
}
case kTypedDataUint8ArrayCid:
case kTypedDataUint8ClampedArrayCid:
case kExternalTypedDataUint8ArrayCid:
case kExternalTypedDataUint8ClampedArrayCid:
case kOneByteStringCid:
case kExternalOneByteStringCid: {
const Register result = locs()->out(0).reg();
ASSERT(representation() == kUnboxedIntPtr);
ASSERT(index_scale() == 1);
__ movzxb(result, element_address);
break;
}
case kTypedDataInt16ArrayCid: {
const Register result = locs()->out(0).reg();
ASSERT(representation() == kUnboxedIntPtr);
__ movsxw(result, element_address);
break;
}
case kTypedDataUint16ArrayCid:
case kTwoByteStringCid:
case kExternalTwoByteStringCid: {
const Register result = locs()->out(0).reg();
ASSERT(representation() == kUnboxedIntPtr);
__ movzxw(result, element_address);
break;
}
default: {
const Register result = locs()->out(0).reg();
ASSERT(representation() == kTagged);
ASSERT((class_id() == kArrayCid) || (class_id() == kImmutableArrayCid) ||
(class_id() == kTypeArgumentsCid));
__ movl(result, element_address);
break;
}
}
}
Representation StoreIndexedInstr::RequiredInputRepresentation(
intptr_t idx) const {
// Array can be a Dart object or a pointer to external data.
if (idx == 0) return kNoRepresentation; // Flexible input representation.
if (idx == 1) {
if (index_unboxed_) {
// TODO(dartbug.com/39432): kUnboxedInt32 || kUnboxedUint32.
return kNoRepresentation;
} else {
return kTagged; // Index is a smi.
}
}
ASSERT(idx == 2);
switch (class_id_) {
case kArrayCid:
return kTagged;
case kOneByteStringCid:
case kTwoByteStringCid:
case kTypedDataInt8ArrayCid:
case kTypedDataInt16ArrayCid:
case kTypedDataUint8ArrayCid:
case kTypedDataUint8ClampedArrayCid:
case kTypedDataUint16ArrayCid:
case kExternalTypedDataUint8ArrayCid:
case kExternalTypedDataUint8ClampedArrayCid:
return kUnboxedIntPtr;
case kTypedDataInt32ArrayCid:
return kUnboxedInt32;
case kTypedDataUint32ArrayCid:
return kUnboxedUint32;
case kTypedDataInt64ArrayCid:
case kTypedDataUint64ArrayCid:
return kUnboxedInt64;
case kTypedDataFloat32ArrayCid:
case kTypedDataFloat64ArrayCid:
return kUnboxedDouble;
case kTypedDataFloat32x4ArrayCid:
return kUnboxedFloat32x4;
case kTypedDataInt32x4ArrayCid:
return kUnboxedInt32x4;
case kTypedDataFloat64x2ArrayCid:
return kUnboxedFloat64x2;
default:
UNIMPLEMENTED();
return kTagged;
}
}
LocationSummary* StoreIndexedInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 3;
const intptr_t kNumTemps =
class_id() == kArrayCid && ShouldEmitStoreBarrier() ? 1 : 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::RequiresRegister());
if (CanBeImmediateIndex(index(), class_id())) {
// CanBeImmediateIndex must return false for unsafe smis.
locs->set_in(1, Location::Constant(index()->definition()->AsConstant()));
} else {
// The index is either untagged (element size == 1) or a smi (for all
// element sizes > 1).
locs->set_in(1, (index_scale() == 1) ? Location::WritableRegister()
: Location::RequiresRegister());
}
switch (class_id()) {
case kArrayCid:
locs->set_in(2, ShouldEmitStoreBarrier()
? Location::WritableRegister()
: LocationRegisterOrConstant(value()));
if (ShouldEmitStoreBarrier()) {
locs->set_in(0, Location::RegisterLocation(kWriteBarrierObjectReg));
locs->set_temp(0, Location::RegisterLocation(kWriteBarrierSlotReg));
}
break;
case kExternalTypedDataUint8ArrayCid:
case kExternalTypedDataUint8ClampedArrayCid:
case kTypedDataInt8ArrayCid:
case kTypedDataUint8ArrayCid:
case kTypedDataUint8ClampedArrayCid:
case kOneByteStringCid:
case kTwoByteStringCid:
// TODO(fschneider): Add location constraint for byte registers (EAX,
// EBX, ECX, EDX) instead of using a fixed register.
locs->set_in(2, LocationFixedRegisterOrSmiConstant(value(), EAX));
break;
case kTypedDataInt16ArrayCid:
case kTypedDataUint16ArrayCid:
// Writable register because the value must be untagged before storing.
locs->set_in(2, Location::WritableRegister());
break;
case kTypedDataInt32ArrayCid:
case kTypedDataUint32ArrayCid:
locs->set_in(2, Location::RequiresRegister());
break;
case kTypedDataInt64ArrayCid:
case kTypedDataUint64ArrayCid:
locs->set_in(2, Location::Pair(Location::RequiresRegister(),
Location::RequiresRegister()));
break;
case kTypedDataFloat32ArrayCid:
case kTypedDataFloat64ArrayCid:
// TODO(srdjan): Support Float64 constants.
locs->set_in(2, Location::RequiresFpuRegister());
break;
case kTypedDataInt32x4ArrayCid:
case kTypedDataFloat32x4ArrayCid:
case kTypedDataFloat64x2ArrayCid:
locs->set_in(2, Location::RequiresFpuRegister());
break;
default:
UNREACHABLE();
return NULL;
}
return locs;
}
void StoreIndexedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
// The array register points to the backing store for external arrays.
const Register array = locs()->in(0).reg();
const Location index = locs()->in(1);
compiler::Address element_address =
index.IsRegister() ? compiler::Assembler::ElementAddressForRegIndex(
IsExternal(), class_id(), index_scale(),
index_unboxed_, array, index.reg())
: compiler::Assembler::ElementAddressForIntIndex(
IsExternal(), class_id(), index_scale(), array,
Smi::Cast(index.constant()).Value());
if ((index_scale() == 1) && index.IsRegister() && !index_unboxed_) {
__ SmiUntag(index.reg());
}
switch (class_id()) {
case kArrayCid:
if (ShouldEmitStoreBarrier()) {
Register value = locs()->in(2).reg();
Register slot = locs()->temp(0).reg();
__ leal(slot, element_address);
__ StoreIntoArray(array, slot, value, CanValueBeSmi());
} else if (locs()->in(2).IsConstant()) {
const Object& constant = locs()->in(2).constant();
__ StoreIntoObjectNoBarrier(array, element_address, constant);
} else {
Register value = locs()->in(2).reg();
__ StoreIntoObjectNoBarrier(array, element_address, value);
}
break;
case kTypedDataInt8ArrayCid:
case kTypedDataUint8ArrayCid:
case kExternalTypedDataUint8ArrayCid:
case kOneByteStringCid:
ASSERT(RequiredInputRepresentation(2) == kUnboxedIntPtr);
if (locs()->in(2).IsConstant()) {
const Smi& constant = Smi::Cast(locs()->in(2).constant());
__ movb(element_address,
compiler::Immediate(static_cast<int8_t>(constant.Value())));
} else {
ASSERT(locs()->in(2).reg() == EAX);
__ movb(element_address, AL);
}
break;
case kTypedDataUint8ClampedArrayCid:
case kExternalTypedDataUint8ClampedArrayCid: {
ASSERT(RequiredInputRepresentation(2) == kUnboxedIntPtr);
if (locs()->in(2).IsConstant()) {
const Smi& constant = Smi::Cast(locs()->in(2).constant());
intptr_t value = constant.Value();
// Clamp to 0x0 or 0xFF respectively.
if (value > 0xFF) {
value = 0xFF;
} else if (value < 0) {
value = 0;
}
__ movb(element_address,
compiler::Immediate(static_cast<int8_t>(value)));
} else {
ASSERT(locs()->in(2).reg() == EAX);
compiler::Label store_value, store_0xff;
__ cmpl(EAX, compiler::Immediate(0xFF));
__ j(BELOW_EQUAL, &store_value, compiler::Assembler::kNearJump);
// Clamp to 0x0 or 0xFF respectively.
__ j(GREATER, &store_0xff);
__ xorl(EAX, EAX);
__ jmp(&store_value, compiler::Assembler::kNearJump);
__ Bind(&store_0xff);
__ movl(EAX, compiler::Immediate(0xFF));
__ Bind(&store_value);
__ movb(element_address, AL);
}
break;
}
case kTwoByteStringCid:
case kTypedDataInt16ArrayCid:
case kTypedDataUint16ArrayCid: {
ASSERT(RequiredInputRepresentation(2) == kUnboxedIntPtr);
const Register value = locs()->in(2).reg();
__ movw(element_address, value);
break;
}
case kTypedDataInt32ArrayCid:
case kTypedDataUint32ArrayCid:
__ movl(element_address, locs()->in(2).reg());
break;
case kTypedDataInt64ArrayCid:
case kTypedDataUint64ArrayCid: {
ASSERT(locs()->in(2).IsPairLocation());
PairLocation* value_pair = locs()->in(2).AsPairLocation();
const Register value_lo = value_pair->At(0).reg();
const Register value_hi = value_pair->At(1).reg();
__ movl(element_address, value_lo);
element_address =
index.IsRegister()
? compiler::Assembler::ElementAddressForRegIndex(
IsExternal(), class_id(), index_scale(), index_unboxed_,
array, index.reg(), kWordSize)
: compiler::Assembler::ElementAddressForIntIndex(
IsExternal(), class_id(), index_scale(), array,
Smi::Cast(index.constant()).Value(), kWordSize);
__ movl(element_address, value_hi);
break;
}
case kTypedDataFloat32ArrayCid:
__ movss(element_address, locs()->in(2).fpu_reg());
break;
case kTypedDataFloat64ArrayCid:
__ movsd(element_address, locs()->in(2).fpu_reg());
break;
case kTypedDataInt32x4ArrayCid:
case kTypedDataFloat32x4ArrayCid:
case kTypedDataFloat64x2ArrayCid:
__ movups(element_address, locs()->in(2).fpu_reg());
break;
default:
UNREACHABLE();
}
}
DEFINE_UNIMPLEMENTED_INSTRUCTION(GuardFieldTypeInstr)
DEFINE_UNIMPLEMENTED_INSTRUCTION(CheckConditionInstr)
LocationSummary* GuardFieldClassInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
const intptr_t value_cid = value()->Type()->ToCid();
const intptr_t field_cid = field().guarded_cid();
const bool emit_full_guard = !opt || (field_cid == kIllegalCid);
const bool needs_value_cid_temp_reg =
(value_cid == kDynamicCid) && (emit_full_guard || (field_cid != kSmiCid));
const bool needs_field_temp_reg = emit_full_guard;
intptr_t num_temps = 0;
if (needs_value_cid_temp_reg) {
num_temps++;
}
if (needs_field_temp_reg) {
num_temps++;
}
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, num_temps, LocationSummary::kNoCall);
summary->set_in(0, Location::RequiresRegister());
for (intptr_t i = 0; i < num_temps; i++) {
summary->set_temp(i, Location::RequiresRegister());
}
return summary;
}
void GuardFieldClassInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
ASSERT(compiler::target::UntaggedObject::kClassIdTagSize == 16);
ASSERT(sizeof(UntaggedField::guarded_cid_) == 2);
ASSERT(sizeof(UntaggedField::is_nullable_) == 2);
const intptr_t value_cid = value()->Type()->ToCid();
const intptr_t field_cid = field().guarded_cid();
const intptr_t nullability = field().is_nullable() ? kNullCid : kIllegalCid;
if (field_cid == kDynamicCid) {
return; // Nothing to emit.
}
const bool emit_full_guard =
!compiler->is_optimizing() || (field_cid == kIllegalCid);
const bool needs_value_cid_temp_reg =
(value_cid == kDynamicCid) && (emit_full_guard || (field_cid != kSmiCid));
const bool needs_field_temp_reg = emit_full_guard;
const Register value_reg = locs()->in(0).reg();
const Register value_cid_reg =
needs_value_cid_temp_reg ? locs()->temp(0).reg() : kNoRegister;
const Register field_reg = needs_field_temp_reg
? locs()->temp(locs()->temp_count() - 1).reg()
: kNoRegister;
compiler::Label ok, fail_label;
compiler::Label* deopt = nullptr;
if (compiler->is_optimizing()) {
deopt = compiler->AddDeoptStub(deopt_id(), ICData::kDeoptGuardField);
}
compiler::Label* fail = (deopt != NULL) ? deopt : &fail_label;
if (emit_full_guard) {
__ LoadObject(field_reg, Field::ZoneHandle(field().Original()));
compiler::FieldAddress field_cid_operand(field_reg,
Field::guarded_cid_offset());
compiler::FieldAddress field_nullability_operand(
field_reg, Field::is_nullable_offset());
if (value_cid == kDynamicCid) {
LoadValueCid(compiler, value_cid_reg, value_reg);
__ cmpw(value_cid_reg, field_cid_operand);
__ j(EQUAL, &ok);
__ cmpw(value_cid_reg, field_nullability_operand);
} else if (value_cid == kNullCid) {
// Value in graph known to be null.
// Compare with null.
__ cmpw(field_nullability_operand, compiler::Immediate(value_cid));
} else {
// Value in graph known to be non-null.
// Compare class id with guard field class id.
__ cmpw(field_cid_operand, compiler::Immediate(value_cid));
}
__ j(EQUAL, &ok);
// Check if the tracked state of the guarded field can be initialized
// inline. If the field needs length check we fall through to runtime
// which is responsible for computing offset of the length field
// based on the class id.
// Length guard will be emitted separately when needed via GuardFieldLength
// instruction after GuardFieldClass.
if (!field().needs_length_check()) {
// Uninitialized field can be handled inline. Check if the
// field is still unitialized.
__ cmpw(field_cid_operand, compiler::Immediate(kIllegalCid));
// Jump to failure path when guard field has been initialized and
// the field and value class ids do not not match.
__ j(NOT_EQUAL, fail);
if (value_cid == kDynamicCid) {
// Do not know value's class id.
__ movw(field_cid_operand, value_cid_reg);
__ movw(field_nullability_operand, value_cid_reg);
} else {
ASSERT(field_reg != kNoRegister);
__ movw(field_cid_operand, compiler::Immediate(value_cid));
__ movw(field_nullability_operand, compiler::Immediate(value_cid));
}
__ jmp(&ok);
}
if (deopt == NULL) {
ASSERT(!compiler->is_optimizing());
__ Bind(fail);
__ cmpw(compiler::FieldAddress(field_reg, Field::guarded_cid_offset()),
compiler::Immediate(kDynamicCid));
__ j(EQUAL, &ok);
__ pushl(field_reg);
__ pushl(value_reg);
__ CallRuntime(kUpdateFieldCidRuntimeEntry, 2);
__ Drop(2); // Drop the field and the value.
} else {
__ jmp(fail);
}
} else {
ASSERT(compiler->is_optimizing());
ASSERT(deopt != NULL);
ASSERT(fail == deopt);
// Field guard class has been initialized and is known.
if (value_cid == kDynamicCid) {
// Value's class id is not known.
__ testl(value_reg, compiler::Immediate(kSmiTagMask));
if (field_cid != kSmiCid) {
__ j(ZERO, fail);
__ LoadClassId(value_cid_reg, value_reg);
__ cmpl(value_cid_reg, compiler::Immediate(field_cid));
}
if (field().is_nullable() && (field_cid != kNullCid)) {
__ j(EQUAL, &ok);
if (field_cid != kSmiCid) {
__ cmpl(value_cid_reg, compiler::Immediate(kNullCid));
} else {
const compiler::Immediate& raw_null =
compiler::Immediate(static_cast<intptr_t>(Object::null()));
__ cmpl(value_reg, raw_null);
}
}
__ j(NOT_EQUAL, fail);
} else if (value_cid == field_cid) {
// This would normaly be caught by Canonicalize, but RemoveRedefinitions
// may sometimes produce the situation after the last Canonicalize pass.
} else {
// Both value's and field's class id is known.
ASSERT(value_cid != nullability);
__ jmp(fail);
}
}
__ Bind(&ok);
}
LocationSummary* GuardFieldLengthInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
if (!opt || (field().guarded_list_length() == Field::kUnknownFixedLength)) {
const intptr_t kNumTemps = 3;
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
summary->set_in(0, Location::RequiresRegister());
// We need temporaries for field object, length offset and expected length.
summary->set_temp(0, Location::RequiresRegister());
summary->set_temp(1, Location::RequiresRegister());
summary->set_temp(2, Location::RequiresRegister());
return summary;
} else {
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, 0, LocationSummary::kNoCall);
summary->set_in(0, Location::RequiresRegister());
return summary;
}
UNREACHABLE();
}
void GuardFieldLengthInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
if (field().guarded_list_length() == Field::kNoFixedLength) {
return; // Nothing to emit.
}
compiler::Label* deopt =
compiler->is_optimizing()
? compiler->AddDeoptStub(deopt_id(), ICData::kDeoptGuardField)
: NULL;
const Register value_reg = locs()->in(0).reg();
if (!compiler->is_optimizing() ||
(field().guarded_list_length() == Field::kUnknownFixedLength)) {
const Register field_reg = locs()->temp(0).reg();
const Register offset_reg = locs()->temp(1).reg();
const Register length_reg = locs()->temp(2).reg();
compiler::Label ok;
__ LoadObject(field_reg, Field::ZoneHandle(field().Original()));
__ movsxb(
offset_reg,
compiler::FieldAddress(
field_reg, Field::guarded_list_length_in_object_offset_offset()));
__ movl(length_reg, compiler::FieldAddress(
field_reg, Field::guarded_list_length_offset()));
__ cmpl(offset_reg, compiler::Immediate(0));
__ j(NEGATIVE, &ok);
// Load the length from the value. GuardFieldClass already verified that
// value's class matches guarded class id of the field.
// offset_reg contains offset already corrected by -kHeapObjectTag that is
// why we use Address instead of FieldAddress.
__ cmpl(length_reg, compiler::Address(value_reg, offset_reg, TIMES_1, 0));
if (deopt == NULL) {
__ j(EQUAL, &ok);
__ pushl(field_reg);
__ pushl(value_reg);
__ CallRuntime(kUpdateFieldCidRuntimeEntry, 2);
__ Drop(2); // Drop the field and the value.
} else {
__ j(NOT_EQUAL, deopt);
}
__ Bind(&ok);
} else {
ASSERT(compiler->is_optimizing());
ASSERT(field().guarded_list_length() >= 0);
ASSERT(field().guarded_list_length_in_object_offset() !=
Field::kUnknownLengthOffset);
__ cmpl(compiler::FieldAddress(
value_reg, field().guarded_list_length_in_object_offset()),
compiler::Immediate(Smi::RawValue(field().guarded_list_length())));
__ j(NOT_EQUAL, deopt);
}
}
class BoxAllocationSlowPath : public TemplateSlowPathCode<Instruction> {
public:
BoxAllocationSlowPath(Instruction* instruction,
const Class& cls,
Register result)
: TemplateSlowPathCode(instruction), cls_(cls), result_(result) {}
virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
if (compiler::Assembler::EmittingComments()) {
__ Comment("%s slow path allocation of %s", instruction()->DebugName(),
String::Handle(cls_.ScrubbedName()).ToCString());
}
__ Bind(entry_label());
const Code& stub = Code::ZoneHandle(
compiler->zone(), StubCode::GetAllocationStubForClass(cls_));
LocationSummary* locs = instruction()->locs();
locs->live_registers()->Remove(Location::RegisterLocation(result_));
compiler->SaveLiveRegisters(locs);
compiler->GenerateStubCall(InstructionSource(), stub,
UntaggedPcDescriptors::kOther, locs);
__ MoveRegister(result_, EAX);
compiler->RestoreLiveRegisters(locs);
__ jmp(exit_label());
}
static void Allocate(FlowGraphCompiler* compiler,
Instruction* instruction,
const Class& cls,
Register result,
Register temp) {
if (compiler->intrinsic_mode()) {
__ TryAllocate(cls, compiler->intrinsic_slow_path_label(),
compiler::Assembler::kFarJump, result, temp);
} else {
BoxAllocationSlowPath* slow_path =
new BoxAllocationSlowPath(instruction, cls, result);
compiler->AddSlowPathCode(slow_path);
__ TryAllocate(cls, slow_path->entry_label(),
compiler::Assembler::kFarJump, result, temp);
__ Bind(slow_path->exit_label());
}
}
private:
const Class& cls_;
const Register result_;
};
LocationSummary* StoreInstanceFieldInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 2;
const intptr_t kNumTemps =
(IsUnboxedStore() && opt) ? 2 : ((IsPotentialUnboxedStore()) ? 3 : 0);
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps,
((IsUnboxedStore() && opt && is_initialization()) ||
IsPotentialUnboxedStore())
? LocationSummary::kCallOnSlowPath
: LocationSummary::kNoCall);
summary->set_in(0, Location::RequiresRegister());
if (IsUnboxedStore() && opt) {
summary->set_in(1, Location::RequiresFpuRegister());
summary->set_temp(0, Location::RequiresRegister());
summary->set_temp(1, Location::RequiresRegister());
} else if (IsPotentialUnboxedStore()) {
summary->set_in(1, ShouldEmitStoreBarrier() ? Location::WritableRegister()
: Location::RequiresRegister());
summary->set_temp(0, Location::RequiresRegister());
summary->set_temp(1, Location::RequiresRegister());
summary->set_temp(2, opt ? Location::RequiresFpuRegister()
: Location::FpuRegisterLocation(XMM1));
} else {
summary->set_in(1, ShouldEmitStoreBarrier()
? Location::WritableRegister()
: LocationRegisterOrConstant(value()));
}
return summary;
}
static void EnsureMutableBox(FlowGraphCompiler* compiler,
StoreInstanceFieldInstr* instruction,
Register box_reg,
const Class& cls,
Register instance_reg,
intptr_t offset,
Register temp) {
compiler::Label done;
const compiler::Immediate& raw_null =
compiler::Immediate(static_cast<intptr_t>(Object::null()));
__ movl(box_reg, compiler::FieldAddress(instance_reg, offset));
__ cmpl(box_reg, raw_null);
__ j(NOT_EQUAL, &done);
BoxAllocationSlowPath::Allocate(compiler, instruction, cls, box_reg, temp);
__ movl(temp, box_reg);
__ StoreIntoObject(instance_reg, compiler::FieldAddress(instance_reg, offset),
temp, compiler::Assembler::kValueIsNotSmi);
__ Bind(&done);
}
void StoreInstanceFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
ASSERT(compiler::target::UntaggedObject::kClassIdTagSize == 16);
ASSERT(sizeof(UntaggedField::guarded_cid_) == 2);
ASSERT(sizeof(UntaggedField::is_nullable_) == 2);
compiler::Label skip_store;
const Register instance_reg = locs()->in(0).reg();
const intptr_t offset_in_bytes = OffsetInBytes();
ASSERT(offset_in_bytes > 0); // Field is finalized and points after header.
if (IsUnboxedStore() && compiler->is_optimizing()) {
XmmRegister value = locs()->in(1).fpu_reg();
Register temp = locs()->temp(0).reg();
Register temp2 = locs()->temp(1).reg();
const intptr_t cid = slot().field().UnboxedFieldCid();
if (is_initialization()) {
const Class* cls = NULL;
switch (cid) {
case kDoubleCid:
cls = &compiler->double_class();
break;
case kFloat32x4Cid:
cls = &compiler->float32x4_class();
break;
case kFloat64x2Cid:
cls = &compiler->float64x2_class();
break;
default:
UNREACHABLE();
}
BoxAllocationSlowPath::Allocate(compiler, this, *cls, temp, temp2);
__ movl(temp2, temp);
__ StoreIntoObject(instance_reg,
compiler::FieldAddress(instance_reg, offset_in_bytes),
temp2, compiler::Assembler::kValueIsNotSmi);
} else {
__ movl(temp, compiler::FieldAddress(instance_reg, offset_in_bytes));
}
switch (cid) {
case kDoubleCid:
__ Comment("UnboxedDoubleStoreInstanceFieldInstr");
__ movsd(compiler::FieldAddress(temp, Double::value_offset()), value);
break;
case kFloat32x4Cid:
__ Comment("UnboxedFloat32x4StoreInstanceFieldInstr");
__ movups(compiler::FieldAddress(temp, Float32x4::value_offset()),
value);
break;
case kFloat64x2Cid:
__ Comment("UnboxedFloat64x2StoreInstanceFieldInstr");
__ movups(compiler::FieldAddress(temp, Float64x2::value_offset()),
value);
break;
default:
UNREACHABLE();
}
return;
}
if (IsPotentialUnboxedStore()) {
__ Comment("PotentialUnboxedStore");
Register value_reg = locs()->in(1).reg();
Register temp = locs()->temp(0).reg();
Register temp2 = locs()->temp(1).reg();
FpuRegister fpu_temp = locs()->temp(2).fpu_reg();
if (ShouldEmitStoreBarrier()) {
// Value input is a writable register and should be manually preserved
// across allocation slow-path. Add it to live_registers set which
// determines which registers to preserve.
locs()->live_registers()->Add(locs()->in(1), kTagged);
}
compiler::Label store_pointer;
compiler::Label store_double;
compiler::Label store_float32x4;
compiler::Label store_float64x2;
__ LoadObject(temp, Field::ZoneHandle(Z, slot().field().Original()));
__ cmpw(compiler::FieldAddress(temp, Field::is_nullable_offset()),
compiler::Immediate(kNullCid));
__ j(EQUAL, &store_pointer);
__ movzxb(temp2, compiler::FieldAddress(temp, Field::kind_bits_offset()));
__ testl(temp2, compiler::Immediate(1 << Field::kUnboxingCandidateBit));
__ j(ZERO, &store_pointer);
__ cmpw(compiler::FieldAddress(temp, Field::guarded_cid_offset()),
compiler::Immediate(kDoubleCid));
__ j(EQUAL, &store_double);
__ cmpw(compiler::FieldAddress(temp, Field::guarded_cid_offset()),
compiler::Immediate(kFloat32x4Cid));
__ j(EQUAL, &store_float32x4);
__ cmpw(compiler::FieldAddress(temp, Field::guarded_cid_offset()),
compiler::Immediate(kFloat64x2Cid));
__ j(EQUAL, &store_float64x2);
// Fall through.
__ jmp(&store_pointer);
if (!compiler->is_optimizing()) {
locs()->live_registers()->Add(locs()->in(0));
locs()->live_registers()->Add(locs()->in(1));
}
{
__ Bind(&store_double);
EnsureMutableBox(compiler, this, temp, compiler->double_class(),
instance_reg, offset_in_bytes, temp2);
__ movsd(fpu_temp,
compiler::FieldAddress(value_reg, Double::value_offset()));
__ movsd(compiler::FieldAddress(temp, Double::value_offset()), fpu_temp);
__ jmp(&skip_store);
}
{
__ Bind(&store_float32x4);
EnsureMutableBox(compiler, this, temp, compiler->float32x4_class(),
instance_reg, offset_in_bytes, temp2);
__ movups(fpu_temp,
compiler::FieldAddress(value_reg, Float32x4::value_offset()));
__ movups(compiler::FieldAddress(temp, Float32x4::value_offset()),
fpu_temp);
__ jmp(&skip_store);
}
{
__ Bind(&store_float64x2);
EnsureMutableBox(compiler, this, temp, compiler->float64x2_class(),
instance_reg, offset_in_bytes, temp2);
__ movups(fpu_temp,
compiler::FieldAddress(value_reg, Float64x2::value_offset()));
__ movups(compiler::FieldAddress(temp, Float64x2::value_offset()),
fpu_temp);
__ jmp(&skip_store);
}
__ Bind(&store_pointer);
}
if (ShouldEmitStoreBarrier()) {
Register value_reg = locs()->in(1).reg();
__ StoreIntoObject(instance_reg,
compiler::FieldAddress(instance_reg, offset_in_bytes),
value_reg, CanValueBeSmi());
} else {
if (locs()->in(1).IsConstant()) {
__ StoreIntoObjectNoBarrier(
instance_reg, compiler::FieldAddress(instance_reg, offset_in_bytes),
locs()->in(1).constant());
} else {
Register value_reg = locs()->in(1).reg();
__ StoreIntoObjectNoBarrier(
instance_reg, compiler::FieldAddress(instance_reg, offset_in_bytes),
value_reg);
}
}
__ Bind(&skip_store);
}
LocationSummary* StoreStaticFieldInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
LocationSummary* locs =
new (zone) LocationSummary(zone, 1, 1, LocationSummary::kNoCall);
locs->set_in(0, value()->NeedsWriteBarrier() ? Location::WritableRegister()
: Location::RequiresRegister());
locs->set_temp(0, Location::RequiresRegister());
return locs;
}
void StoreStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
Register value = locs()->in(0).reg();
Register temp = locs()->temp(0).reg();
compiler->used_static_fields().Add(&field());
__ movl(temp,
compiler::Address(
THR, compiler::target::Thread::field_table_values_offset()));
// Note: static fields ids won't be changed by hot-reload.
__ movl(
compiler::Address(temp, compiler::target::FieldTable::OffsetOf(field())),
value);
}
LocationSummary* InstanceOfInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 3;
const intptr_t kNumTemps = 0;
LocationSummary* summary = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kCall);
summary->set_in(0, Location::RegisterLocation(TypeTestABI::kInstanceReg));
summary->set_in(1, Location::RegisterLocation(
TypeTestABI::kInstantiatorTypeArgumentsReg));
summary->set_in(
2, Location::RegisterLocation(TypeTestABI::kFunctionTypeArgumentsReg));
summary->set_out(0, Location::RegisterLocation(EAX));
return summary;
}
void InstanceOfInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
ASSERT(locs()->in(0).reg() == TypeTestABI::kInstanceReg);
ASSERT(locs()->in(1).reg() == TypeTestABI::kInstantiatorTypeArgumentsReg);
ASSERT(locs()->in(2).reg() == TypeTestABI::kFunctionTypeArgumentsReg);
compiler->GenerateInstanceOf(source(), deopt_id(), type(), locs());
ASSERT(locs()->out(0).reg() == EAX);
}
// TODO(srdjan): In case of constant inputs make CreateArray kNoCall and
// use slow path stub.
LocationSummary* CreateArrayInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 2;
const intptr_t kNumTemps = 0;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kCall);
locs->set_in(0, Location::RegisterLocation(ECX));
locs->set_in(1, Location::RegisterLocation(EDX));
locs->set_out(0, Location::RegisterLocation(EAX));
return locs;
}
// Inlines array allocation for known constant values.
static void InlineArrayAllocation(FlowGraphCompiler* compiler,
intptr_t num_elements,
compiler::Label* slow_path,
compiler::Label* done) {
const int kInlineArraySize = 12; // Same as kInlineInstanceSize.
const Register kLengthReg = EDX;
const Register kElemTypeReg = ECX;
const intptr_t instance_size = Array::InstanceSize(num_elements);
// Instance in EAX.
// Object end address in EBX.
__ TryAllocateArray(kArrayCid, instance_size, slow_path,
compiler::Assembler::kFarJump,
EAX, // instance
EBX, // end address
EDI); // temp
// Store the type argument field.
__ StoreIntoObjectNoBarrier(
EAX, compiler::FieldAddress(EAX, Array::type_arguments_offset()),
kElemTypeReg);
// Set the length field.
__ StoreIntoObjectNoBarrier(
EAX, compiler::FieldAddress(EAX, Array::length_offset()), kLengthReg);
// Initialize all array elements to raw_null.
// EAX: new object start as a tagged pointer.
// EBX: new object end address.
// EDI: iterator which initially points to the start of the variable
// data area to be initialized.
if (num_elements > 0) {
const intptr_t array_size = instance_size - sizeof(UntaggedArray);
const compiler::Immediate& raw_null =
compiler::Immediate(static_cast<intptr_t>(Object::null()));
__ leal(EDI, compiler::FieldAddress(EAX, sizeof(UntaggedArray)));
if (array_size < (kInlineArraySize * kWordSize)) {
intptr_t current_offset = 0;
__ movl(EBX, raw_null);
while (current_offset < array_size) {
__ StoreIntoObjectNoBarrier(EAX, compiler::Address(EDI, current_offset),
EBX);
current_offset += kWordSize;
}
} else {
compiler::Label init_loop;
__ Bind(&init_loop);
__ StoreIntoObjectNoBarrier(EAX, compiler::Address(EDI, 0),
Object::null_object());
__ addl(EDI, compiler::Immediate(kWordSize));
__ cmpl(EDI, EBX);
__ j(BELOW, &init_loop, compiler::Assembler::kNearJump);
}
}
__ jmp(done, compiler::Assembler::kNearJump);
}
void CreateArrayInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
// Allocate the array. EDX = length, ECX = element type.
const Register kLengthReg = EDX;
const Register kElemTypeReg = ECX;
const Register kResultReg = EAX;
ASSERT(locs()->in(0).reg() == kElemTypeReg);
ASSERT(locs()->in(1).reg() == kLengthReg);
compiler::Label slow_path, done;
if (compiler->is_optimizing() && num_elements()->BindsToConstant() &&
num_elements()->BoundConstant().IsSmi()) {
const intptr_t length = Smi::Cast(num_elements()->BoundConstant()).Value();
if (Array::IsValidLength(length)) {
InlineArrayAllocation(compiler, length, &slow_path, &done);
}
}
__ Bind(&slow_path);
auto object_store = compiler->isolate_group()->object_store();
const auto& allocate_array_stub =
Code::ZoneHandle(compiler->zone(), object_store->allocate_array_stub());
compiler->GenerateStubCall(source(), allocate_array_stub,
UntaggedPcDescriptors::kOther, locs(), deopt_id());
__ Bind(&done);
ASSERT(locs()->out(0).reg() == kResultReg);
}
LocationSummary* LoadFieldInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
const intptr_t kNumInputs = 1;
LocationSummary* locs = nullptr;
if (slot().representation() != kTagged) {
ASSERT(!calls_initializer());
ASSERT(RepresentationUtils::IsUnboxedInteger(slot().representation()));
const size_t value_size =
RepresentationUtils::ValueSize(slot().representation());
const intptr_t kNumTemps = 0;
locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::RequiresRegister());
if (value_size <= compiler::target::kWordSize) {
locs->set_out(0, Location::RequiresRegister());
} else {
ASSERT(value_size <= 2 * compiler::target::kWordSize);
locs->set_out(0, Location::Pair(Location::RequiresRegister(),
Location::RequiresRegister()));
}
} else if (IsUnboxedDartFieldLoad() && opt) {
ASSERT(!calls_initializer());
const intptr_t kNumTemps = 1;
locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::RequiresRegister());
locs->set_temp(0, Location::RequiresRegister());
locs->set_out(0, Location::RequiresFpuRegister());
} else if (IsPotentialUnboxedDartFieldLoad()) {
ASSERT(!calls_initializer());
const intptr_t kNumTemps = 2;
locs = new (zone) LocationSummary(zone, kNumInputs, kNumTemps,
LocationSummary::kCallOnSlowPath);
locs->set_in(0, Location::RequiresRegister());
locs->set_temp(0, opt ? Location::RequiresFpuRegister()
: Location::FpuRegisterLocation(XMM1));
locs->set_temp(1, Location::RequiresRegister());
locs->set_out(0, Location::RequiresRegister());
} else if (calls_initializer()) {
if (throw_exception_on_initialization()) {
ASSERT(!UseSharedSlowPathStub(opt));
const intptr_t kNumTemps = 0;
locs = new (zone) LocationSummary(zone, kNumInputs, kNumTemps,
LocationSummary::kCallOnSlowPath);
locs->set_in(0, Location::RequiresRegister());
locs->set_out(0, Location::RequiresRegister());
} else {
const intptr_t kNumTemps = 0;
locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kCall);
locs->set_in(
0, Location::RegisterLocation(InitInstanceFieldABI::kInstanceReg));
locs->set_out(
0, Location::RegisterLocation(InitInstanceFieldABI::kResultReg));
}
} else {
const intptr_t kNumTemps = 0;
locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
locs->set_in(0, Location::RequiresRegister());
locs->set_out(0, Location::RequiresRegister());
}
return locs;
}
void LoadFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
ASSERT(compiler::target::UntaggedObject::kClassIdTagSize == 16);
ASSERT(sizeof(UntaggedField::guarded_cid_) == 2);
ASSERT(sizeof(UntaggedField::is_nullable_) == 2);
const Register instance_reg = locs()->in(0).reg();
if (slot().representation() != kTagged) {
switch (slot().representation()) {
case kUnboxedInt64: {
auto const out_pair = locs()->out(0).AsPairLocation();
const Register out_lo = out_pair->At(0).reg();
const Register out_hi = out_pair->At(1).reg();
const intptr_t offset_lo = OffsetInBytes();
const intptr_t offset_hi = offset_lo + compiler::target::kWordSize;
__ Comment("UnboxedInt64LoadFieldInstr");
__ movl(out_lo, compiler::FieldAddress(instance_reg, offset_lo));
__ movl(out_hi, compiler::FieldAddress(instance_reg, offset_hi));
break;
}
case kUnboxedUint32: {
const Register result = locs()->out(0).reg();
__ Comment("UnboxedUint32LoadFieldInstr");
__ movl(result, compiler::FieldAddress(instance_reg, OffsetInBytes()));
break;
}
case kUnboxedUint8: {
const Register result = locs()->out(0).reg();
__ Comment("UnboxedUint8LoadFieldInstr");
__ movzxb(result,
compiler::FieldAddress(instance_reg, OffsetInBytes()));
break;
}
default:
UNIMPLEMENTED();
break;
}
return;
}
if (IsUnboxedDartFieldLoad() && compiler->is_optimizing()) {
XmmRegister result = locs()->out(0).fpu_reg();
Register temp = locs()->temp(0).reg();
__ movl(temp, compiler::FieldAddress(instance_reg, OffsetInBytes()));
const intptr_t cid = slot().field().UnboxedFieldCid();
switch (cid) {
case kDoubleCid:
__ Comment("UnboxedDoubleLoadFieldInstr");
__ movsd(result, compiler::FieldAddress(temp, Double::value_offset()));
break;
case kFloat32x4Cid:
__ Comment("UnboxedFloat32x4LoadFieldInstr");
__ movups(result,
compiler::FieldAddress(temp, Float32x4::value_offset()));
break;
case kFloat64x2Cid:
__ Comment("UnboxedFloat64x2LoadFieldInstr");
__ movups(result,
compiler::FieldAddress(temp, Float64x2::value_offset()));
break;
default:
UNREACHABLE();
}
return;
}
compiler::Label done;
const Register result = locs()->out(0).reg();
if (IsPotentialUnboxedDartFieldLoad()) {
Register temp = locs()->temp(1).reg();
XmmRegister value = locs()->temp(0).fpu_reg();
compiler::Label load_pointer;
compiler::Label load_double;
compiler::Label load_float32x4;
compiler::Label load_float64x2;
__ LoadObject(result, Field::ZoneHandle(slot().field().Original()));
compiler::FieldAddress field_cid_operand(result,
Field::guarded_cid_offset());
compiler::FieldAddress field_nullability_operand(
result, Field::is_nullable_offset());
__ cmpw(field_nullability_operand, compiler::Immediate(kNullCid));
__ j(EQUAL, &load_pointer);
__ cmpw(field_cid_operand, compiler::Immediate(kDoubleCid));
__ j(EQUAL, &load_double);
__ cmpw(field_cid_operand, compiler::Immediate(kFloat32x4Cid));
__ j(EQUAL, &load_float32x4);
__ cmpw(field_cid_operand, compiler::Immediate(kFloat64x2Cid));
__ j(EQUAL, &