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il_x64.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.
#include "platform/globals.h"
#include "vm/globals.h" // Needed here to get TARGET_ARCH_X64.
#if defined(TARGET_ARCH_X64)
#include "vm/compiler/backend/il.h"
#include "vm/compiler/assembler/assembler.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/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"
#include "vm/type_testing_stubs.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 RAX (or XMM0 if
// the return type is double).
LocationSummary* Instruction::MakeCallSummary(Zone* zone,
const Instruction* instr,
LocationSummary* locs) {
ASSERT(locs == nullptr || locs->always_calls());
LocationSummary* result =
((locs == nullptr)
? (new (zone) LocationSummary(zone, 0, 0, LocationSummary::kCall))
: locs);
const auto representation = instr->representation();
switch (representation) {
case kTagged:
case kUnboxedInt64:
result->set_out(
0, Location::RegisterLocation(CallingConventions::kReturnReg));
break;
case kUnboxedDouble:
result->set_out(
0, Location::FpuRegisterLocation(CallingConventions::kReturnFpuReg));
break;
default:
UNREACHABLE();
break;
}
return result;
}
LocationSummary* LoadIndexedUnsafeInstr::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);
locs->set_in(0, Location::RequiresRegister());
switch (representation()) {
case kTagged:
case kUnboxedInt64:
locs->set_out(0, Location::RequiresRegister());
break;
case kUnboxedDouble:
locs->set_out(0, Location::RequiresFpuRegister());
break;
default:
UNREACHABLE();
break;
}
return locs;
}
void LoadIndexedUnsafeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
ASSERT(RequiredInputRepresentation(0) == kTagged); // It is a Smi.
ASSERT(kSmiTag == 0);
ASSERT(kSmiTagSize == 1);
const Register index = locs()->in(0).reg();
switch (representation()) {
case kTagged:
case kUnboxedInt64: {
const auto out = locs()->out(0).reg();
__ movq(out, compiler::Address(base_reg(), index, TIMES_4, offset()));
break;
}
case kUnboxedDouble: {
const auto out = locs()->out(0).fpu_reg();
__ movsd(out, compiler::Address(base_reg(), index, TIMES_4, offset()));
break;
}
default:
UNREACHABLE();
break;
}
}
DEFINE_BACKEND(StoreIndexedUnsafe,
(NoLocation, Register index, Register value)) {
ASSERT(instr->RequiredInputRepresentation(
StoreIndexedUnsafeInstr::kIndexPos) == kTagged); // It is a Smi.
__ movq(compiler::Address(instr->base_reg(), index, TIMES_4, instr->offset()),
value);
ASSERT(kSmiTag == 0);
ASSERT(kSmiTagSize == 1);
}
DEFINE_BACKEND(TailCall, (NoLocation, Fixed<Register, ARGS_DESC_REG>)) {
compiler->EmitTailCallToStub(instr->code());
// Even though the TailCallInstr will be the last instruction in a basic
// block, the flow graph compiler will emit native code for other blocks after
// the one containing this instruction and needs to be able to use the pool.
// (The `LeaveDartFrame` above disables usages of the pool.)
__ set_constant_pool_allowed(true);
}
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::RegisterLocation(RSI));
locs->set_in(kDestPos, Location::RegisterLocation(RDI));
locs->set_in(kSrcStartPos, Location::WritableRegister());
locs->set_in(kDestStartPos, Location::WritableRegister());
locs->set_in(kLengthPos, Location::RegisterLocation(RCX));
return locs;
}
void MemoryCopyInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
const Register src_start_reg = locs()->in(kSrcStartPos).reg();
const Register dest_start_reg = locs()->in(kDestStartPos).reg();
EmitComputeStartPointer(compiler, src_cid_, src_start(), RSI, src_start_reg);
EmitComputeStartPointer(compiler, dest_cid_, dest_start(), RDI,
dest_start_reg);
if (element_size_ <= 8) {
__ SmiUntag(RCX);
}
switch (element_size_) {
case 1:
__ rep_movsb();
break;
case 2:
__ rep_movsw();
break;
case 4:
__ rep_movsl();
break;
case 8:
case 16:
__ rep_movsq();
break;
}
}
void MemoryCopyInstr::EmitComputeStartPointer(FlowGraphCompiler* compiler,
classid_t array_cid,
Value* start,
Register array_reg,
Register start_reg) {
intptr_t offset;
if (IsTypedDataBaseClassId(array_cid)) {
__ movq(
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:
__ movq(array_reg,
compiler::FieldAddress(array_reg,
compiler::target::ExternalOneByteString::
external_data_offset()));
offset = 0;
break;
case kExternalTwoByteStringCid:
__ movq(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;
}
__ leaq(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);
if (representation() == kUnboxedDouble) {
locs->set_in(0, Location::RequiresFpuRegister());
} else if (representation() == kUnboxedInt64) {
locs->set_in(0, Location::RequiresRegister());
} else {
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()) {
__ pushq(value.reg());
} else if (value.IsConstant()) {
__ PushObject(value.constant());
} else if (value.IsFpuRegister()) {
__ AddImmediate(RSP, compiler::Immediate(-kDoubleSize));
__ movsd(compiler::Address(RSP, 0), value.fpu_reg());
} else {
ASSERT(value.IsStackSlot());
__ pushq(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);
switch (representation()) {
case kTagged:
case kUnboxedInt64:
locs->set_in(0,
Location::RegisterLocation(CallingConventions::kReturnReg));
break;
case kUnboxedDouble:
locs->set_in(
0, Location::FpuRegisterLocation(CallingConventions::kReturnFpuReg));
break;
default:
UNREACHABLE();
break;
}
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) {
if (locs()->in(0).IsRegister()) {
const Register result = locs()->in(0).reg();
ASSERT(result == CallingConventions::kReturnReg);
} else {
ASSERT(locs()->in(0).IsFpuRegister());
const FpuRegister result = locs()->in(0).fpu_reg();
ASSERT(result == CallingConventions::kReturnFpuReg);
}
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);
__ movq(RDI, RSP);
__ subq(RDI, RBP);
__ CompareImmediate(RDI, compiler::Immediate(fp_sp_dist));
__ j(EQUAL, &done, compiler::Assembler::kNearJump);
__ int3();
__ Bind(&done);
#endif
ASSERT(__ constant_pool_allowed());
if (yield_index() != UntaggedPcDescriptors::kInvalidYieldIndex) {
compiler->EmitYieldPositionMetadata(source(), yield_index());
}
__ LeaveDartFrame(); // Disallows constant pool use.
__ ret();
// This ReturnInstr may be emitted out of order by the optimizer. The next
// block may be a target expecting a properly set constant pool pointer.
__ set_constant_pool_allowed(true);
}
static const RegisterSet kCalleeSaveRegistersSet(
CallingConventions::kCalleeSaveCpuRegisters,
CallingConventions::kCalleeSaveXmmRegisters);
// Keep in sync with NativeEntryInstr::EmitNativeCode.
void NativeReturnInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
EmitReturnMoves(compiler);
__ LeaveDartFrame();
// Pop dummy return address.
__ popq(TMP);
// Anything besides the return register.
const Register vm_tag_reg = RBX;
const Register old_exit_frame_reg = RCX;
const Register old_exit_through_ffi_reg = RDI;
__ popq(old_exit_frame_reg);
__ popq(old_exit_through_ffi_reg);
// Restore top_resource.
__ popq(TMP);
__ movq(
compiler::Address(THR, compiler::target::Thread::top_resource_offset()),
TMP);
__ popq(vm_tag_reg);
// 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());
// Restore C++ ABI callee-saved registers.
__ PopRegisters(kCalleeSaveRegistersSet);
#if defined(TARGET_OS_FUCHSIA) && defined(USING_SHADOW_CALL_STACK)
#error Unimplemented
#endif
// Leave the entry frame.
__ LeaveFrame();
// Leave the dummy frame holding the pushed arguments.
__ LeaveFrame();
__ ret();
// For following blocks.
__ set_constant_pool_allowed(true);
}
// Detect pattern when one value is zero and another is a power of 2.
static bool IsPowerOfTwoKind(intptr_t v1, intptr_t v2) {
return (Utils::IsPowerOfTwo(v1) && (v2 == 0)) ||
(Utils::IsPowerOfTwo(v2) && (v1 == 0));
}
LocationSummary* IfThenElseInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
comparison()->InitializeLocationSummary(zone, opt);
// TODO(dartbug.com/30952) support convertion of Register to corresponding
// least significant byte register (e.g. RAX -> AL, RSI -> SIL, r15 -> r15b).
comparison()->locs()->set_out(0, Location::RegisterLocation(RDX));
return comparison()->locs();
}
void IfThenElseInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
ASSERT(locs()->out(0).reg() == RDX);
// Clear upper part of the out register. We are going to use setcc on it
// which is a byte move.
__ xorq(RDX, RDX);
// Emit comparison code. This must not overwrite the result register.
// IfThenElseInstr::Supports() should prevent EmitComparisonCode from using
// the labels or returning an invalid condition.
BranchLabels labels = {NULL, NULL, NULL};
Condition true_condition = comparison()->EmitComparisonCode(compiler, labels);
ASSERT(true_condition != kInvalidCondition);
const bool is_power_of_two_kind = IsPowerOfTwoKind(if_true_, if_false_);
intptr_t true_value = if_true_;
intptr_t false_value = if_false_;
if (is_power_of_two_kind) {
if (true_value == 0) {
// We need to have zero in RDX on true_condition.
true_condition = InvertCondition(true_condition);
}
} else {
if (true_value == 0) {
// Swap values so that false_value is zero.
intptr_t temp = true_value;
true_value = false_value;
false_value = temp;
} else {
true_condition = InvertCondition(true_condition);
}
}
__ setcc(true_condition, DL);
if (is_power_of_two_kind) {
const intptr_t shift =
Utils::ShiftForPowerOfTwo(Utils::Maximum(true_value, false_value));
__ shlq(RDX, compiler::Immediate(shift + kSmiTagSize));
} else {
__ decq(RDX);
__ AndImmediate(RDX, compiler::Immediate(Smi::RawValue(true_value) -
Smi::RawValue(false_value)));
if (false_value != 0) {
__ AddImmediate(RDX, compiler::Immediate(Smi::RawValue(false_value)));
}
}
}
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.
__ movq(compiler::Address(
RBP, 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();
__ LoadObject(result, value());
}
}
void ConstantInstr::EmitMoveToLocation(FlowGraphCompiler* compiler,
const Location& destination,
Register tmp) {
if (destination.IsRegister()) {
if (RepresentationUtils::IsUnboxedInteger(representation())) {
const int64_t value = Integer::Cast(value_).AsInt64Value();
if (value == 0) {
__ xorl(destination.reg(), destination.reg());
} else {
__ movq(destination.reg(), compiler::Immediate(value));
}
} else {
ASSERT(representation() == kTagged);
__ LoadObject(destination.reg(), value_);
}
} else if (destination.IsFpuRegister()) {
if (Utils::DoublesBitEqual(Double::Cast(value_).value(), 0.0)) {
__ xorps(destination.fpu_reg(), destination.fpu_reg());
} else {
ASSERT(tmp != kNoRegister);
__ LoadObject(tmp, value_);
__ movsd(destination.fpu_reg(),
compiler::FieldAddress(tmp, Double::value_offset()));
}
} else if (destination.IsDoubleStackSlot()) {
if (Utils::DoublesBitEqual(Double::Cast(value_).value(), 0.0)) {
__ xorps(FpuTMP, FpuTMP);
} else {
ASSERT(tmp != kNoRegister);
__ LoadObject(tmp, value_);
__ movsd(FpuTMP, compiler::FieldAddress(tmp, Double::value_offset()));
}
__ movsd(LocationToStackSlotAddress(destination), FpuTMP);
} else {
ASSERT(destination.IsStackSlot());
if (RepresentationUtils::IsUnboxedInteger(representation())) {
const int64_t value = Integer::Cast(value_).AsInt64Value();
__ movq(LocationToStackSlotAddress(destination),
compiler::Immediate(value));
} else {
ASSERT(representation() == kTagged);
__ StoreObject(LocationToStackSlotAddress(destination), value_);
}
}
}
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 = is_unboxed_int ? 0 : 1;
LocationSummary* locs = new (zone)
LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
if (is_unboxed_int) {
locs->set_out(0, Location::RequiresRegister());
} else {
switch (representation()) {
case kUnboxedDouble:
locs->set_out(0, Location::RequiresFpuRegister());
locs->set_temp(0, Location::RequiresRegister());
break;
default:
UNREACHABLE();
break;
}
}
return locs;
}
void UnboxedConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
// The register allocator drops constant definitions that have no uses.
if (!locs()->out(0).IsInvalid()) {
const Register scratch =
RepresentationUtils::IsUnboxedInteger(representation())
? kNoRegister
: locs()->temp(0).reg();
EmitMoveToLocation(compiler, locs()->out(0), scratch);
}
}
LocationSummary* AssertAssignableInstr::MakeLocationSummary(Zone* zone,
bool opt) const {
auto const dst_type_loc =
LocationFixedRegisterOrConstant(dst_type(), TypeTestABI::kDstTypeReg);
// We want to prevent spilling of the inputs (e.g. function/instantiator tav),
// since TTS preserves them. So we make this a `kNoCall` summary,
// even though most other registers can be modified by the stub. To tell the
// register allocator about it, we reserve all the other registers as
// temporary registers.
// TODO(http://dartbug.com/32788): Simplify this.
const intptr_t kNonChangeableInputRegs =
(1 << TypeTestABI::kInstanceReg) |
((dst_type_loc.IsRegister() ? 1 : 0) << TypeTestABI::kDstTypeReg) |
(1 << TypeTestABI::kInstantiatorTypeArgumentsReg) |
(1 << TypeTestABI::kFunctionTypeArgumentsReg);
const intptr_t kNumInputs = 4;
// We invoke a stub that can potentially clobber any CPU register
// but can only clobber FPU registers on the slow path when
// entering runtime. Preserve all FPU registers that are
// not guarateed to be preserved by the ABI.
const intptr_t kCpuRegistersToPreserve =
kDartAvailableCpuRegs & ~kNonChangeableInputRegs;
const intptr_t kFpuRegistersToPreserve =
CallingConventions::kVolatileXmmRegisters & ~(1 << FpuTMP);
const intptr_t kNumTemps = (Utils::CountOneBits64(kCpuRegistersToPreserve) +
Utils::CountOneBits64(kFpuRegistersToPreserve));
LocationSummary* summary = new (zone) LocationSummary(
zone, kNumInputs, kNumTemps, LocationSummary::kCallCalleeSafe);
summary->set_in(kInstancePos,
Location::RegisterLocation(TypeTestABI::kInstanceReg));
summary->set_in(kDstTypePos, dst_type_loc);
summary->set_in(
kInstantiatorTAVPos,
Location::RegisterLocation(TypeTestABI::kInstantiatorTypeArgumentsReg));
summary->set_in(kFunctionTAVPos, Location::RegisterLocation(
TypeTestABI::kFunctionTypeArgumentsReg));
summary->set_out(0, Location::SameAsFirstInput());
// Let's reserve all registers except for the input ones.
intptr_t next_temp = 0;
for (intptr_t i = 0; i < kNumberOfCpuRegisters; ++i) {
const bool should_preserve = ((1 << i) & kCpuRegistersToPreserve) != 0;
if (should_preserve) {
summary->set_temp(next_temp++,
Location::RegisterLocation(static_cast<Register>(i)));
}
}
for (intptr_t i = 0; i < kNumberOfFpuRegisters; i++) {
const bool should_preserve = ((1 << i) & kFpuRegistersToPreserve) != 0;
if (should_preserve) {
summary->set_temp(next_temp++, Location::FpuRegisterLocation(
static_cast<FpuRegister>(i)));
}
}
return summary;
}
static Condition TokenKindToIntCondition(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() == 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 || operation_cid() == kMintCid) {
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) {
__ LoadImmediate(value_cid_reg, compiler::Immediate(kSmiCid));
}
__ testq(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 EmitInt64ComparisonOp(FlowGraphCompiler* compiler,
const LocationSummary& locs,
Token::Kind kind) {
Location left = locs.in(0);
Location right = locs.in(1);
ASSERT(!left.IsConstant() || !right.IsConstant());
Condition true_condition = TokenKindToIntCondition(kind);
if (left.IsConstant() || right.IsConstant()) {
// Ensure constant is on the right.
ConstantInstr* constant = NULL;
if (left.IsConstant()) {
constant = left.constant_instruction();
Location tmp = right;
right = left;
left = tmp;
true_condition = FlipCondition(true_condition);
} else {
constant = right.constant_instruction();
}
if (RepresentationUtils::IsUnboxedInteger(constant->representation())) {
int64_t value;
const bool ok = compiler::HasIntegerValue(constant->value(), &value);
RELEASE_ASSERT(ok);
__ cmpq(left.reg(), compiler::Immediate(value));
} else {
ASSERT(constant->representation() == kTagged);
__ CompareObject(left.reg(), right.constant());
}
} else if (right.IsStackSlot()) {
__ cmpq(left.reg(), LocationToStackSlotAddress(right));
} else {
__ cmpq(left.reg(), right.reg());
}
return true_condition;
}
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) || (operation_cid() == kMintCid)) {
return EmitInt64ComparisonOp(compiler, *locs(), kind());
} 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);
__ 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_reg = locs()->in(0).reg();
Location right = locs()->in(1);
if (right.IsConstant()) {
ASSERT(right.constant().IsSmi());
const int64_t imm = static_cast<int64_t>(right.constant().ptr());
__ TestImmediate(left_reg, compiler::Immediate(imm));
} else {
__ testq(left_reg, 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;
__ testq(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;
__ cmpq(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() == 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;
}
if (operation_cid() == kSmiCid || operation_cid() == kMintCid) {
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;
}
UNREACHABLE();
return NULL;
}
Condition RelationalOpInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
BranchLabels labels) {
if (operation_cid() == kSmiCid || operation_cid() == kMintCid) {
return EmitInt64ComparisonOp(compiler, *locs(), kind());
} else {
ASSERT(operation_cid() == kDoubleCid);
return EmitDoubleComparisonOp(compiler, *locs(), kind(), labels);