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dart / sdk.git / 8f1c48343daf5f99481a586d0bb93f362bfee4ab / . / runtime / vm / flow_graph_compiler_ia32.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 "vm/globals.h" // Needed here to get TARGET_ARCH_IA32.
#if defined(TARGET_ARCH_IA32)
#include "vm/flow_graph_compiler.h"
#include "vm/ast_printer.h"
#include "vm/code_patcher.h"
#include "vm/compiler.h"
#include "vm/cpu.h"
#include "vm/dart_entry.h"
#include "vm/deopt_instructions.h"
#include "vm/flow_graph_builder.h"
#include "vm/il_printer.h"
#include "vm/instructions.h"
#include "vm/locations.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/verified_memory.h"
namespace dart {
DEFINE_FLAG(bool, trap_on_deoptimization, false, "Trap on deoptimization.");
DEFINE_FLAG(bool, unbox_mints, true, "Optimize 64-bit integer arithmetic.");
DECLARE_FLAG(bool, enable_simd_inline);
DECLARE_FLAG(bool, use_megamorphic_stub);
FlowGraphCompiler::~FlowGraphCompiler() {
// BlockInfos are zone-allocated, so their destructors are not called.
// Verify the labels explicitly here.
for (int i = 0; i < block_info_.length(); ++i) {
ASSERT(!block_info_[i]->jump_label()->IsLinked());
ASSERT(!block_info_[i]->jump_label()->HasNear());
}
}
bool FlowGraphCompiler::SupportsUnboxedDoubles() {
return true;
}
bool FlowGraphCompiler::SupportsUnboxedMints() {
return FLAG_unbox_mints;
}
bool FlowGraphCompiler::SupportsUnboxedSimd128() {
return FLAG_enable_simd_inline;
}
bool FlowGraphCompiler::SupportsSinCos() {
return true;
}
bool FlowGraphCompiler::SupportsHardwareDivision() {
return true;
}
void FlowGraphCompiler::EnterIntrinsicMode() {
ASSERT(!intrinsic_mode());
intrinsic_mode_ = true;
}
void FlowGraphCompiler::ExitIntrinsicMode() {
ASSERT(intrinsic_mode());
intrinsic_mode_ = false;
}
RawTypedData* CompilerDeoptInfo::CreateDeoptInfo(FlowGraphCompiler* compiler,
DeoptInfoBuilder* builder,
const Array& deopt_table) {
if (deopt_env_ == NULL) {
++builder->current_info_number_;
return TypedData::null();
}
intptr_t stack_height = compiler->StackSize();
AllocateIncomingParametersRecursive(deopt_env_, &stack_height);
intptr_t slot_ix = 0;
Environment* current = deopt_env_;
// Emit all kMaterializeObject instructions describing objects to be
// materialized on the deoptimization as a prefix to the deoptimization info.
EmitMaterializations(deopt_env_, builder);
// The real frame starts here.
builder->MarkFrameStart();
Zone* zone = compiler->zone();
builder->AddPcMarker(Function::Handle(zone), slot_ix++);
builder->AddCallerFp(slot_ix++);
builder->AddReturnAddress(current->function(), deopt_id(), slot_ix++);
// Emit all values that are needed for materialization as a part of the
// expression stack for the bottom-most frame. This guarantees that GC
// will be able to find them during materialization.
slot_ix = builder->EmitMaterializationArguments(slot_ix);
// For the innermost environment, set outgoing arguments and the locals.
for (intptr_t i = current->Length() - 1;
i >= current->fixed_parameter_count();
i--) {
builder->AddCopy(current->ValueAt(i), current->LocationAt(i), slot_ix++);
}
builder->AddPcMarker(current->function(), slot_ix++);
builder->AddCallerFp(slot_ix++);
Environment* previous = current;
current = current->outer();
while (current != NULL) {
// For any outer environment the deopt id is that of the call instruction
// which is recorded in the outer environment.
builder->AddReturnAddress(
current->function(),
Thread::ToDeoptAfter(current->deopt_id()),
slot_ix++);
// The values of outgoing arguments can be changed from the inlined call so
// we must read them from the previous environment.
for (intptr_t i = previous->fixed_parameter_count() - 1; i >= 0; i--) {
builder->AddCopy(previous->ValueAt(i),
previous->LocationAt(i),
slot_ix++);
}
// Set the locals, note that outgoing arguments are not in the environment.
for (intptr_t i = current->Length() - 1;
i >= current->fixed_parameter_count();
i--) {
builder->AddCopy(current->ValueAt(i),
current->LocationAt(i),
slot_ix++);
}
builder->AddPcMarker(current->function(), slot_ix++);
builder->AddCallerFp(slot_ix++);
// Iterate on the outer environment.
previous = current;
current = current->outer();
}
// The previous pointer is now the outermost environment.
ASSERT(previous != NULL);
// For the outermost environment, set caller PC.
builder->AddCallerPc(slot_ix++);
// For the outermost environment, set the incoming arguments.
for (intptr_t i = previous->fixed_parameter_count() - 1; i >= 0; i--) {
builder->AddCopy(previous->ValueAt(i), previous->LocationAt(i), slot_ix++);
}
return builder->CreateDeoptInfo(deopt_table);
}
void CompilerDeoptInfoWithStub::GenerateCode(FlowGraphCompiler* compiler,
intptr_t stub_ix) {
// Calls do not need stubs, they share a deoptimization trampoline.
ASSERT(reason() != ICData::kDeoptAtCall);
Assembler* assem = compiler->assembler();
#define __ assem->
__ Comment("%s", Name());
__ Bind(entry_label());
if (FLAG_trap_on_deoptimization) {
__ int3();
}
ASSERT(deopt_env() != NULL);
__ pushl(CODE_REG);
__ Call(*StubCode::Deoptimize_entry());
set_pc_offset(assem->CodeSize());
__ int3();
#undef __
}
#define __ assembler()->
// Fall through if bool_register contains null.
void FlowGraphCompiler::GenerateBoolToJump(Register bool_register,
Label* is_true,
Label* is_false) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
Label fall_through;
__ cmpl(bool_register, raw_null);
__ j(EQUAL, &fall_through, Assembler::kNearJump);
__ CompareObject(bool_register, Bool::True());
__ j(EQUAL, is_true);
__ jmp(is_false);
__ Bind(&fall_through);
}
// Clobbers ECX.
RawSubtypeTestCache* FlowGraphCompiler::GenerateCallSubtypeTestStub(
TypeTestStubKind test_kind,
Register instance_reg,
Register type_arguments_reg,
Register temp_reg,
Label* is_instance_lbl,
Label* is_not_instance_lbl) {
const SubtypeTestCache& type_test_cache =
SubtypeTestCache::ZoneHandle(zone(), SubtypeTestCache::New());
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ LoadObject(temp_reg, type_test_cache);
__ pushl(temp_reg); // Subtype test cache.
__ pushl(instance_reg); // Instance.
if (test_kind == kTestTypeOneArg) {
ASSERT(type_arguments_reg == kNoRegister);
__ pushl(raw_null);
__ Call(*StubCode::Subtype1TestCache_entry());
} else if (test_kind == kTestTypeTwoArgs) {
ASSERT(type_arguments_reg == kNoRegister);
__ pushl(raw_null);
__ Call(*StubCode::Subtype2TestCache_entry());
} else if (test_kind == kTestTypeThreeArgs) {
__ pushl(type_arguments_reg);
__ Call(*StubCode::Subtype3TestCache_entry());
} else {
UNREACHABLE();
}
// Result is in ECX: null -> not found, otherwise Bool::True or Bool::False.
ASSERT(instance_reg != ECX);
ASSERT(temp_reg != ECX);
__ popl(instance_reg); // Discard.
__ popl(instance_reg); // Restore receiver.
__ popl(temp_reg); // Discard.
GenerateBoolToJump(ECX, is_instance_lbl, is_not_instance_lbl);
return type_test_cache.raw();
}
// Jumps to labels 'is_instance' or 'is_not_instance' respectively, if
// type test is conclusive, otherwise fallthrough if a type test could not
// be completed.
// EAX: instance (must survive).
// Clobbers ECX, EDI.
RawSubtypeTestCache*
FlowGraphCompiler::GenerateInstantiatedTypeWithArgumentsTest(
intptr_t token_pos,
const AbstractType& type,
Label* is_instance_lbl,
Label* is_not_instance_lbl) {
__ Comment("InstantiatedTypeWithArgumentsTest");
ASSERT(type.IsInstantiated());
const Class& type_class = Class::ZoneHandle(zone(), type.type_class());
ASSERT((type_class.NumTypeArguments() > 0) || type_class.IsSignatureClass());
const Register kInstanceReg = EAX;
Error& malformed_error = Error::Handle(zone());
const Type& int_type = Type::Handle(zone(), Type::IntType());
const bool smi_is_ok =
int_type.IsSubtypeOf(type, &malformed_error, Heap::kOld);
// Malformed type should have been handled at graph construction time.
ASSERT(smi_is_ok || malformed_error.IsNull());
__ testl(kInstanceReg, Immediate(kSmiTagMask));
if (smi_is_ok) {
__ j(ZERO, is_instance_lbl);
} else {
__ j(ZERO, is_not_instance_lbl);
}
const intptr_t num_type_args = type_class.NumTypeArguments();
const intptr_t num_type_params = type_class.NumTypeParameters();
const intptr_t from_index = num_type_args - num_type_params;
const TypeArguments& type_arguments =
TypeArguments::ZoneHandle(zone(), type.arguments());
const bool is_raw_type = type_arguments.IsNull() ||
type_arguments.IsRaw(from_index, num_type_params);
// Signature class is an instantiated parameterized type.
if (!type_class.IsSignatureClass()) {
if (is_raw_type) {
const Register kClassIdReg = ECX;
// dynamic type argument, check only classes.
__ LoadClassId(kClassIdReg, kInstanceReg);
__ cmpl(kClassIdReg, Immediate(type_class.id()));
__ j(EQUAL, is_instance_lbl);
// List is a very common case.
if (IsListClass(type_class)) {
GenerateListTypeCheck(kClassIdReg, is_instance_lbl);
}
return GenerateSubtype1TestCacheLookup(
token_pos, type_class, is_instance_lbl, is_not_instance_lbl);
}
// If one type argument only, check if type argument is Object or dynamic.
if (type_arguments.Length() == 1) {
const AbstractType& tp_argument = AbstractType::ZoneHandle(
zone(), type_arguments.TypeAt(0));
ASSERT(!tp_argument.IsMalformed());
if (tp_argument.IsType()) {
ASSERT(tp_argument.HasResolvedTypeClass());
// Check if type argument is dynamic or Object.
const Type& object_type = Type::Handle(zone(), Type::ObjectType());
if (object_type.IsSubtypeOf(tp_argument, NULL, Heap::kOld)) {
// Instance class test only necessary.
return GenerateSubtype1TestCacheLookup(
token_pos, type_class, is_instance_lbl, is_not_instance_lbl);
}
}
}
}
// Regular subtype test cache involving instance's type arguments.
const Register kTypeArgumentsReg = kNoRegister;
const Register kTempReg = EDI;
return GenerateCallSubtypeTestStub(kTestTypeTwoArgs,
kInstanceReg,
kTypeArgumentsReg,
kTempReg,
is_instance_lbl,
is_not_instance_lbl);
}
void FlowGraphCompiler::CheckClassIds(Register class_id_reg,
const GrowableArray<intptr_t>& class_ids,
Label* is_equal_lbl,
Label* is_not_equal_lbl) {
for (intptr_t i = 0; i < class_ids.length(); i++) {
__ cmpl(class_id_reg, Immediate(class_ids[i]));
__ j(EQUAL, is_equal_lbl);
}
__ jmp(is_not_equal_lbl);
}
// Testing against an instantiated type with no arguments, without
// SubtypeTestCache.
// EAX: instance to test against (preserved).
// Clobbers ECX, EDI.
// Returns true if there is a fallthrough.
bool FlowGraphCompiler::GenerateInstantiatedTypeNoArgumentsTest(
intptr_t token_pos,
const AbstractType& type,
Label* is_instance_lbl,
Label* is_not_instance_lbl) {
__ Comment("InstantiatedTypeNoArgumentsTest");
ASSERT(type.IsInstantiated());
const Class& type_class = Class::Handle(zone(), type.type_class());
ASSERT(type_class.NumTypeArguments() == 0);
const Register kInstanceReg = EAX;
__ testl(kInstanceReg, Immediate(kSmiTagMask));
// If instance is Smi, check directly.
const Class& smi_class = Class::Handle(zone(), Smi::Class());
if (smi_class.IsSubtypeOf(TypeArguments::Handle(zone()),
type_class,
TypeArguments::Handle(zone()),
NULL,
Heap::kOld)) {
__ j(ZERO, is_instance_lbl);
} else {
__ j(ZERO, is_not_instance_lbl);
}
// Compare if the classes are equal.
const Register kClassIdReg = ECX;
__ LoadClassId(kClassIdReg, kInstanceReg);
__ cmpl(kClassIdReg, Immediate(type_class.id()));
__ j(EQUAL, is_instance_lbl);
// See ClassFinalizer::ResolveSuperTypeAndInterfaces for list of restricted
// interfaces.
// Bool interface can be implemented only by core class Bool.
if (type.IsBoolType()) {
__ cmpl(kClassIdReg, Immediate(kBoolCid));
__ j(EQUAL, is_instance_lbl);
__ jmp(is_not_instance_lbl);
return false;
}
if (type.IsFunctionType()) {
// Check if instance is a closure.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ LoadClassById(EDI, kClassIdReg);
__ movl(EDI, FieldAddress(EDI, Class::signature_function_offset()));
__ cmpl(EDI, raw_null);
__ j(NOT_EQUAL, is_instance_lbl);
}
// Custom checking for numbers (Smi, Mint, Bigint and Double).
// Note that instance is not Smi (checked above).
if (type.IsSubtypeOf(
Type::Handle(zone(), Type::Number()), NULL, Heap::kOld)) {
GenerateNumberTypeCheck(
kClassIdReg, type, is_instance_lbl, is_not_instance_lbl);
return false;
}
if (type.IsStringType()) {
GenerateStringTypeCheck(kClassIdReg, is_instance_lbl, is_not_instance_lbl);
return false;
}
// Otherwise fallthrough.
return true;
}
// Uses SubtypeTestCache to store instance class and result.
// EAX: instance to test.
// Clobbers EDI, ECX.
// Immediate class test already done.
// TODO(srdjan): Implement a quicker subtype check, as type test
// arrays can grow too high, but they may be useful when optimizing
// code (type-feedback).
RawSubtypeTestCache* FlowGraphCompiler::GenerateSubtype1TestCacheLookup(
intptr_t token_pos,
const Class& type_class,
Label* is_instance_lbl,
Label* is_not_instance_lbl) {
__ Comment("Subtype1TestCacheLookup");
const Register kInstanceReg = EAX;
__ LoadClass(ECX, kInstanceReg, EDI);
// ECX: instance class.
// Check immediate superclass equality.
__ movl(EDI, FieldAddress(ECX, Class::super_type_offset()));
__ movl(EDI, FieldAddress(EDI, Type::type_class_offset()));
__ CompareObject(EDI, type_class);
__ j(EQUAL, is_instance_lbl);
const Register kTypeArgumentsReg = kNoRegister;
const Register kTempReg = EDI;
return GenerateCallSubtypeTestStub(kTestTypeOneArg,
kInstanceReg,
kTypeArgumentsReg,
kTempReg,
is_instance_lbl,
is_not_instance_lbl);
}
// Generates inlined check if 'type' is a type parameter or type itself
// EAX: instance (preserved).
// Clobbers EDX, EDI, ECX.
RawSubtypeTestCache* FlowGraphCompiler::GenerateUninstantiatedTypeTest(
intptr_t token_pos,
const AbstractType& type,
Label* is_instance_lbl,
Label* is_not_instance_lbl) {
__ Comment("UninstantiatedTypeTest");
ASSERT(!type.IsInstantiated());
// Skip check if destination is a dynamic type.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
if (type.IsTypeParameter()) {
const TypeParameter& type_param = TypeParameter::Cast(type);
// Load instantiator (or null) and instantiator type arguments on stack.
__ movl(EDX, Address(ESP, 0)); // Get instantiator type arguments.
// EDX: instantiator type arguments.
// Check if type arguments are null, i.e. equivalent to vector of dynamic.
__ cmpl(EDX, raw_null);
__ j(EQUAL, is_instance_lbl);
__ movl(EDI,
FieldAddress(EDX, TypeArguments::type_at_offset(type_param.index())));
// EDI: concrete type of type.
// Check if type argument is dynamic.
__ CompareObject(EDI, Type::ZoneHandle(zone(), Type::DynamicType()));
__ j(EQUAL, is_instance_lbl);
__ CompareObject(EDI, Type::ZoneHandle(zone(), Type::ObjectType()));
__ j(EQUAL, is_instance_lbl);
// For Smi check quickly against int and num interfaces.
Label not_smi;
__ testl(EAX, Immediate(kSmiTagMask)); // Value is Smi?
__ j(NOT_ZERO, &not_smi, Assembler::kNearJump);
__ CompareObject(EDI, Type::ZoneHandle(zone(), Type::IntType()));
__ j(EQUAL, is_instance_lbl);
__ CompareObject(EDI, Type::ZoneHandle(zone(), Type::Number()));
__ j(EQUAL, is_instance_lbl);
// Smi must be handled in runtime.
Label fall_through;
__ jmp(&fall_through);
__ Bind(&not_smi);
// EDX: instantiator type arguments.
// EAX: instance.
const Register kInstanceReg = EAX;
const Register kTypeArgumentsReg = EDX;
const Register kTempReg = EDI;
const SubtypeTestCache& type_test_cache =
SubtypeTestCache::ZoneHandle(zone(),
GenerateCallSubtypeTestStub(kTestTypeThreeArgs,
kInstanceReg,
kTypeArgumentsReg,
kTempReg,
is_instance_lbl,
is_not_instance_lbl));
__ Bind(&fall_through);
return type_test_cache.raw();
}
if (type.IsType()) {
const Register kInstanceReg = EAX;
const Register kTypeArgumentsReg = EDX;
__ testl(kInstanceReg, Immediate(kSmiTagMask)); // Is instance Smi?
__ j(ZERO, is_not_instance_lbl);
__ movl(kTypeArgumentsReg, Address(ESP, 0)); // Instantiator type args.
// Uninstantiated type class is known at compile time, but the type
// arguments are determined at runtime by the instantiator.
const Register kTempReg = EDI;
return GenerateCallSubtypeTestStub(kTestTypeThreeArgs,
kInstanceReg,
kTypeArgumentsReg,
kTempReg,
is_instance_lbl,
is_not_instance_lbl);
}
return SubtypeTestCache::null();
}
// Inputs:
// - EAX: instance to test against (preserved).
// - EDX: optional instantiator type arguments (preserved).
// Clobbers ECX, EDI.
// Returns:
// - preserved instance in EAX and optional instantiator type arguments in EDX.
// Note that this inlined code must be followed by the runtime_call code, as it
// may fall through to it. Otherwise, this inline code will jump to the label
// is_instance or to the label is_not_instance.
RawSubtypeTestCache* FlowGraphCompiler::GenerateInlineInstanceof(
intptr_t token_pos,
const AbstractType& type,
Label* is_instance_lbl,
Label* is_not_instance_lbl) {
__ Comment("InlineInstanceof");
if (type.IsVoidType()) {
// A non-null value is returned from a void function, which will result in a
// type error. A null value is handled prior to executing this inline code.
return SubtypeTestCache::null();
}
if (type.IsInstantiated()) {
const Class& type_class = Class::ZoneHandle(zone(), type.type_class());
// A class equality check is only applicable with a dst type of a
// non-parameterized class, non-signature class, or with a raw dst type of
// a parameterized class.
if (type_class.IsSignatureClass() || (type_class.NumTypeArguments() > 0)) {
return GenerateInstantiatedTypeWithArgumentsTest(token_pos,
type,
is_instance_lbl,
is_not_instance_lbl);
// Fall through to runtime call.
}
const bool has_fall_through =
GenerateInstantiatedTypeNoArgumentsTest(token_pos,
type,
is_instance_lbl,
is_not_instance_lbl);
if (has_fall_through) {
// If test non-conclusive so far, try the inlined type-test cache.
// 'type' is known at compile time.
return GenerateSubtype1TestCacheLookup(
token_pos, type_class, is_instance_lbl, is_not_instance_lbl);
} else {
return SubtypeTestCache::null();
}
}
return GenerateUninstantiatedTypeTest(token_pos,
type,
is_instance_lbl,
is_not_instance_lbl);
}
// If instanceof type test cannot be performed successfully at compile time and
// therefore eliminated, optimize it by adding inlined tests for:
// - NULL -> return false.
// - Smi -> compile time subtype check (only if dst class is not parameterized).
// - Class equality (only if class is not parameterized).
// Inputs:
// - EAX: object.
// - EDX: instantiator type arguments or raw_null.
// - ECX: instantiator or raw_null.
// Clobbers ECX and EDX.
// Returns:
// - true or false in EAX.
void FlowGraphCompiler::GenerateInstanceOf(intptr_t token_pos,
intptr_t deopt_id,
const AbstractType& type,
bool negate_result,
LocationSummary* locs) {
ASSERT(type.IsFinalized() && !type.IsMalformedOrMalbounded());
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
Label is_instance, is_not_instance;
__ pushl(ECX); // Store instantiator on stack.
__ pushl(EDX); // Store instantiator type arguments.
// If type is instantiated and non-parameterized, we can inline code
// checking whether the tested instance is a Smi.
if (type.IsInstantiated()) {
// A null object is only an instance of Object and dynamic, which has
// already been checked above (if the type is instantiated). So we can
// return false here if the instance is null (and if the type is
// instantiated).
// We can only inline this null check if the type is instantiated at compile
// time, since an uninstantiated type at compile time could be Object or
// dynamic at run time.
__ cmpl(EAX, raw_null);
__ j(EQUAL, type.IsNullType() ? &is_instance : &is_not_instance);
}
// Generate inline instanceof test.
SubtypeTestCache& test_cache = SubtypeTestCache::ZoneHandle(zone());
test_cache = GenerateInlineInstanceof(token_pos, type,
&is_instance, &is_not_instance);
// test_cache is null if there is no fall-through.
Label done;
if (!test_cache.IsNull()) {
// Generate runtime call.
__ movl(EDX, Address(ESP, 0)); // Get instantiator type arguments.
__ movl(ECX, Address(ESP, kWordSize)); // Get instantiator.
__ PushObject(Object::null_object()); // Make room for the result.
__ pushl(EAX); // Push the instance.
__ PushObject(type); // Push the type.
__ pushl(ECX); // Instantiator.
__ pushl(EDX); // Instantiator type arguments.
__ LoadObject(EAX, test_cache);
__ pushl(EAX);
GenerateRuntimeCall(token_pos,
deopt_id,
kInstanceofRuntimeEntry,
5,
locs);
// Pop the parameters supplied to the runtime entry. The result of the
// instanceof runtime call will be left as the result of the operation.
__ Drop(5);
if (negate_result) {
__ popl(EDX);
__ LoadObject(EAX, Bool::True());
__ cmpl(EDX, EAX);
__ j(NOT_EQUAL, &done, Assembler::kNearJump);
__ LoadObject(EAX, Bool::False());
} else {
__ popl(EAX);
}
__ jmp(&done, Assembler::kNearJump);
}
__ Bind(&is_not_instance);
__ LoadObject(EAX, Bool::Get(negate_result));
__ jmp(&done, Assembler::kNearJump);
__ Bind(&is_instance);
__ LoadObject(EAX, Bool::Get(!negate_result));
__ Bind(&done);
__ popl(EDX); // Remove pushed instantiator type arguments.
__ popl(ECX); // Remove pushed instantiator.
}
// Optimize assignable type check by adding inlined tests for:
// - NULL -> return NULL.
// - Smi -> compile time subtype check (only if dst class is not parameterized).
// - Class equality (only if class is not parameterized).
// Inputs:
// - EAX: object.
// - EDX: instantiator type arguments or raw_null.
// - ECX: instantiator or raw_null.
// Returns:
// - object in EAX for successful assignable check (or throws TypeError).
// Performance notes: positive checks must be quick, negative checks can be slow
// as they throw an exception.
void FlowGraphCompiler::GenerateAssertAssignable(intptr_t token_pos,
intptr_t deopt_id,
const AbstractType& dst_type,
const String& dst_name,
LocationSummary* locs) {
ASSERT(token_pos >= 0);
ASSERT(!dst_type.IsNull());
ASSERT(dst_type.IsFinalized());
// Assignable check is skipped in FlowGraphBuilder, not here.
ASSERT(dst_type.IsMalformedOrMalbounded() ||
(!dst_type.IsDynamicType() && !dst_type.IsObjectType()));
__ pushl(ECX); // Store instantiator.
__ pushl(EDX); // Store instantiator type arguments.
// A null object is always assignable and is returned as result.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
Label is_assignable, runtime_call;
__ cmpl(EAX, raw_null);
__ j(EQUAL, &is_assignable);
// Generate throw new TypeError() if the type is malformed or malbounded.
if (dst_type.IsMalformedOrMalbounded()) {
__ PushObject(Object::null_object()); // Make room for the result.
__ pushl(EAX); // Push the source object.
__ PushObject(dst_name); // Push the name of the destination.
__ PushObject(dst_type); // Push the type of the destination.
GenerateRuntimeCall(token_pos,
deopt_id,
kBadTypeErrorRuntimeEntry,
3,
locs);
// We should never return here.
__ int3();
__ Bind(&is_assignable); // For a null object.
__ popl(EDX); // Remove pushed instantiator type arguments.
__ popl(ECX); // Remove pushed instantiator.
return;
}
// Generate inline type check, linking to runtime call if not assignable.
SubtypeTestCache& test_cache = SubtypeTestCache::ZoneHandle(zone());
test_cache = GenerateInlineInstanceof(token_pos, dst_type,
&is_assignable, &runtime_call);
__ Bind(&runtime_call);
__ movl(EDX, Address(ESP, 0)); // Get instantiator type arguments.
__ movl(ECX, Address(ESP, kWordSize)); // Get instantiator.
__ PushObject(Object::null_object()); // Make room for the result.
__ pushl(EAX); // Push the source object.
__ PushObject(dst_type); // Push the type of the destination.
__ pushl(ECX); // Instantiator.
__ pushl(EDX); // Instantiator type arguments.
__ PushObject(dst_name); // Push the name of the destination.
__ LoadObject(EAX, test_cache);
__ pushl(EAX);
GenerateRuntimeCall(token_pos, deopt_id, kTypeCheckRuntimeEntry, 6, locs);
// Pop the parameters supplied to the runtime entry. The result of the
// type check runtime call is the checked value.
__ Drop(6);
__ popl(EAX);
__ Bind(&is_assignable);
__ popl(EDX); // Remove pushed instantiator type arguments.
__ popl(ECX); // Remove pushed instantiator.
}
void FlowGraphCompiler::EmitInstructionEpilogue(Instruction* instr) {
if (is_optimizing()) {
return;
}
Definition* defn = instr->AsDefinition();
if ((defn != NULL) && defn->HasTemp()) {
Location value = defn->locs()->out(0);
if (value.IsRegister()) {
__ pushl(value.reg());
} else if (value.IsConstant()) {
__ PushObject(value.constant());
} else {
ASSERT(value.IsStackSlot());
__ pushl(value.ToStackSlotAddress());
}
}
}
void FlowGraphCompiler::CopyParameters() {
__ Comment("Copy parameters");
const Function& function = parsed_function().function();
LocalScope* scope = parsed_function().node_sequence()->scope();
const int num_fixed_params = function.num_fixed_parameters();
const int num_opt_pos_params = function.NumOptionalPositionalParameters();
const int num_opt_named_params = function.NumOptionalNamedParameters();
const int num_params =
num_fixed_params + num_opt_pos_params + num_opt_named_params;
ASSERT(function.NumParameters() == num_params);
ASSERT(parsed_function().first_parameter_index() == kFirstLocalSlotFromFp);
// Check that min_num_pos_args <= num_pos_args <= max_num_pos_args,
// where num_pos_args is the number of positional arguments passed in.
const int min_num_pos_args = num_fixed_params;
const int max_num_pos_args = num_fixed_params + num_opt_pos_params;
__ movl(ECX,
FieldAddress(EDX, ArgumentsDescriptor::positional_count_offset()));
// Check that min_num_pos_args <= num_pos_args.
Label wrong_num_arguments;
__ cmpl(ECX, Immediate(Smi::RawValue(min_num_pos_args)));
__ j(LESS, &wrong_num_arguments);
// Check that num_pos_args <= max_num_pos_args.
__ cmpl(ECX, Immediate(Smi::RawValue(max_num_pos_args)));
__ j(GREATER, &wrong_num_arguments);
// Copy positional arguments.
// Argument i passed at fp[kParamEndSlotFromFp + num_args - i] is copied
// to fp[kFirstLocalSlotFromFp - i].
__ movl(EBX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
// Since EBX and ECX are Smi, use TIMES_2 instead of TIMES_4.
// Let EBX point to the last passed positional argument, i.e. to
// fp[kParamEndSlotFromFp + num_args - (num_pos_args - 1)].
__ subl(EBX, ECX);
__ leal(EBX, Address(EBP, EBX, TIMES_2,
(kParamEndSlotFromFp + 1) * kWordSize));
// Let EDI point to the last copied positional argument, i.e. to
// fp[kFirstLocalSlotFromFp - (num_pos_args - 1)].
__ leal(EDI, Address(EBP, (kFirstLocalSlotFromFp + 1) * kWordSize));
__ subl(EDI, ECX); // ECX is a Smi, subtract twice for TIMES_4 scaling.
__ subl(EDI, ECX);
__ SmiUntag(ECX);
Label loop, loop_condition;
__ jmp(&loop_condition, Assembler::kNearJump);
// We do not use the final allocation index of the variable here, i.e.
// scope->VariableAt(i)->index(), because captured variables still need
// to be copied to the context that is not yet allocated.
const Address argument_addr(EBX, ECX, TIMES_4, 0);
const Address copy_addr(EDI, ECX, TIMES_4, 0);
__ Bind(&loop);
__ movl(EAX, argument_addr);
__ movl(copy_addr, EAX);
__ Bind(&loop_condition);
__ decl(ECX);
__ j(POSITIVE, &loop, Assembler::kNearJump);
// Copy or initialize optional named arguments.
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
Label all_arguments_processed;
#ifdef DEBUG
const bool check_correct_named_args = true;
#else
const bool check_correct_named_args = function.IsClosureFunction();
#endif
if (num_opt_named_params > 0) {
// Start by alphabetically sorting the names of the optional parameters.
LocalVariable** opt_param = new LocalVariable*[num_opt_named_params];
int* opt_param_position = new int[num_opt_named_params];
for (int pos = num_fixed_params; pos < num_params; pos++) {
LocalVariable* parameter = scope->VariableAt(pos);
const String& opt_param_name = parameter->name();
int i = pos - num_fixed_params;
while (--i >= 0) {
LocalVariable* param_i = opt_param[i];
const intptr_t result = opt_param_name.CompareTo(param_i->name());
ASSERT(result != 0);
if (result > 0) break;
opt_param[i + 1] = opt_param[i];
opt_param_position[i + 1] = opt_param_position[i];
}
opt_param[i + 1] = parameter;
opt_param_position[i + 1] = pos;
}
// Generate code handling each optional parameter in alphabetical order.
__ movl(EBX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ movl(ECX,
FieldAddress(EDX, ArgumentsDescriptor::positional_count_offset()));
__ SmiUntag(ECX);
// Let EBX point to the first passed argument, i.e. to
// fp[kParamEndSlotFromFp + num_args - 0]; num_args (EBX) is Smi.
__ leal(EBX,
Address(EBP, EBX, TIMES_2, kParamEndSlotFromFp * kWordSize));
// Let EDI point to the entry of the first named argument.
__ leal(EDI,
FieldAddress(EDX, ArgumentsDescriptor::first_named_entry_offset()));
for (int i = 0; i < num_opt_named_params; i++) {
Label load_default_value, assign_optional_parameter;
const int param_pos = opt_param_position[i];
// Check if this named parameter was passed in.
// Load EAX with the name of the argument.
__ movl(EAX, Address(EDI, ArgumentsDescriptor::name_offset()));
ASSERT(opt_param[i]->name().IsSymbol());
__ CompareObject(EAX, opt_param[i]->name());
__ j(NOT_EQUAL, &load_default_value, Assembler::kNearJump);
// Load EAX with passed-in argument at provided arg_pos, i.e. at
// fp[kParamEndSlotFromFp + num_args - arg_pos].
__ movl(EAX, Address(EDI, ArgumentsDescriptor::position_offset()));
// EAX is arg_pos as Smi.
// Point to next named entry.
__ addl(EDI, Immediate(ArgumentsDescriptor::named_entry_size()));
__ negl(EAX);
Address argument_addr(EBX, EAX, TIMES_2, 0); // EAX is a negative Smi.
__ movl(EAX, argument_addr);
__ jmp(&assign_optional_parameter, Assembler::kNearJump);
__ Bind(&load_default_value);
// Load EAX with default argument.
const Instance& value = parsed_function().DefaultParameterValueAt(
param_pos - num_fixed_params);
__ LoadObject(EAX, value);
__ Bind(&assign_optional_parameter);
// Assign EAX to fp[kFirstLocalSlotFromFp - param_pos].
// We do not use the final allocation index of the variable here, i.e.
// scope->VariableAt(i)->index(), because captured variables still need
// to be copied to the context that is not yet allocated.
const intptr_t computed_param_pos = kFirstLocalSlotFromFp - param_pos;
const Address param_addr(EBP, computed_param_pos * kWordSize);
__ movl(param_addr, EAX);
}
delete[] opt_param;
delete[] opt_param_position;
if (check_correct_named_args) {
// Check that EDI now points to the null terminator in the arguments
// descriptor.
__ cmpl(Address(EDI, 0), raw_null);
__ j(EQUAL, &all_arguments_processed, Assembler::kNearJump);
}
} else {
ASSERT(num_opt_pos_params > 0);
__ movl(ECX,
FieldAddress(EDX, ArgumentsDescriptor::positional_count_offset()));
__ SmiUntag(ECX);
for (int i = 0; i < num_opt_pos_params; i++) {
Label next_parameter;
// Handle this optional positional parameter only if k or fewer positional
// arguments have been passed, where k is param_pos, the position of this
// optional parameter in the formal parameter list.
const int param_pos = num_fixed_params + i;
__ cmpl(ECX, Immediate(param_pos));
__ j(GREATER, &next_parameter, Assembler::kNearJump);
// Load EAX with default argument.
const Object& value = parsed_function().DefaultParameterValueAt(i);
__ LoadObject(EAX, value);
// Assign EAX to fp[kFirstLocalSlotFromFp - param_pos].
// We do not use the final allocation index of the variable here, i.e.
// scope->VariableAt(i)->index(), because captured variables still need
// to be copied to the context that is not yet allocated.
const intptr_t computed_param_pos = kFirstLocalSlotFromFp - param_pos;
const Address param_addr(EBP, computed_param_pos * kWordSize);
__ movl(param_addr, EAX);
__ Bind(&next_parameter);
}
if (check_correct_named_args) {
__ movl(EBX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ SmiUntag(EBX);
// Check that ECX equals EBX, i.e. no named arguments passed.
__ cmpl(ECX, EBX);
__ j(EQUAL, &all_arguments_processed, Assembler::kNearJump);
}
}
__ Bind(&wrong_num_arguments);
if (function.IsClosureFunction()) {
__ LeaveFrame(); // The arguments are still on the stack.
__ Jmp(*StubCode::CallClosureNoSuchMethod_entry());
// The noSuchMethod call may return to the caller, but not here.
} else if (check_correct_named_args) {
__ Stop("Wrong arguments");
}
__ Bind(&all_arguments_processed);
// Nullify originally passed arguments only after they have been copied and
// checked, otherwise noSuchMethod would not see their original values.
// This step can be skipped in case we decide that formal parameters are
// implicitly final, since garbage collecting the unmodified value is not
// an issue anymore.
// EDX : arguments descriptor array.
__ movl(ECX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ SmiUntag(ECX);
Label null_args_loop, null_args_loop_condition;
__ jmp(&null_args_loop_condition, Assembler::kNearJump);
const Address original_argument_addr(
EBP, ECX, TIMES_4, (kParamEndSlotFromFp + 1) * kWordSize);
__ Bind(&null_args_loop);
__ movl(original_argument_addr, raw_null);
__ Bind(&null_args_loop_condition);
__ decl(ECX);
__ j(POSITIVE, &null_args_loop, Assembler::kNearJump);
}
void FlowGraphCompiler::GenerateInlinedGetter(intptr_t offset) {
// TOS: return address.
// +1 : receiver.
// Sequence node has one return node, its input is load field node.
__ Comment("Inlined Getter");
__ movl(EAX, Address(ESP, 1 * kWordSize));
__ movl(EAX, FieldAddress(EAX, offset));
__ ret();
}
void FlowGraphCompiler::GenerateInlinedSetter(intptr_t offset) {
// TOS: return address.
// +1 : value
// +2 : receiver.
// Sequence node has one store node and one return NULL node.
__ Comment("Inlined Setter");
__ movl(EAX, Address(ESP, 2 * kWordSize)); // Receiver.
__ movl(EBX, Address(ESP, 1 * kWordSize)); // Value.
__ StoreIntoObject(EAX, FieldAddress(EAX, offset), EBX);
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ movl(EAX, raw_null);
__ ret();
}
// NOTE: If the entry code shape changes, ReturnAddressLocator in profiler.cc
// needs to be updated to match.
void FlowGraphCompiler::EmitFrameEntry() {
const Function& function = parsed_function().function();
if (CanOptimizeFunction() &&
function.IsOptimizable() &&
(!is_optimizing() || may_reoptimize())) {
const Register function_reg = EBX;
__ LoadObject(function_reg, function);
// Reoptimization of an optimized function is triggered by counting in
// IC stubs, but not at the entry of the function.
if (!is_optimizing()) {
__ incl(FieldAddress(function_reg, Function::usage_counter_offset()));
}
__ cmpl(FieldAddress(function_reg, Function::usage_counter_offset()),
Immediate(GetOptimizationThreshold()));
ASSERT(function_reg == EBX);
__ J(GREATER_EQUAL, *StubCode::OptimizeFunction_entry());
}
__ Comment("Enter frame");
if (flow_graph().IsCompiledForOsr()) {
intptr_t extra_slots = StackSize()
- flow_graph().num_stack_locals()
- flow_graph().num_copied_params();
ASSERT(extra_slots >= 0);
__ EnterOsrFrame(extra_slots * kWordSize);
} else {
ASSERT(StackSize() >= 0);
__ EnterDartFrame(StackSize() * kWordSize);
}
}
void FlowGraphCompiler::CompileGraph() {
InitCompiler();
if (TryIntrinsify()) {
// Skip regular code generation.
return;
}
EmitFrameEntry();
const Function& function = parsed_function().function();
const int num_fixed_params = function.num_fixed_parameters();
const int num_copied_params = parsed_function().num_copied_params();
const int num_locals = parsed_function().num_stack_locals();
// We check the number of passed arguments when we have to copy them due to
// the presence of optional parameters.
// No such checking code is generated if only fixed parameters are declared,
// unless we are in debug mode or unless we are compiling a closure.
if (num_copied_params == 0) {
#ifdef DEBUG
ASSERT(!parsed_function().function().HasOptionalParameters());
const bool check_arguments = !flow_graph().IsCompiledForOsr();
#else
const bool check_arguments =
function.IsClosureFunction() && !flow_graph().IsCompiledForOsr();
#endif
if (check_arguments) {
__ Comment("Check argument count");
// Check that exactly num_fixed arguments are passed in.
Label correct_num_arguments, wrong_num_arguments;
__ movl(EAX, FieldAddress(EDX, ArgumentsDescriptor::count_offset()));
__ cmpl(EAX, Immediate(Smi::RawValue(num_fixed_params)));
__ j(NOT_EQUAL, &wrong_num_arguments, Assembler::kNearJump);
__ cmpl(EAX,
FieldAddress(EDX,
ArgumentsDescriptor::positional_count_offset()));
__ j(EQUAL, &correct_num_arguments, Assembler::kNearJump);
__ Bind(&wrong_num_arguments);
if (function.IsClosureFunction()) {
__ LeaveFrame(); // The arguments are still on the stack.
__ Jmp(*StubCode::CallClosureNoSuchMethod_entry());
// The noSuchMethod call may return to the caller, but not here.
} else {
__ Stop("Wrong number of arguments");
}
__ Bind(&correct_num_arguments);
}
} else if (!flow_graph().IsCompiledForOsr()) {
CopyParameters();
}
if (function.IsClosureFunction() && !flow_graph().IsCompiledForOsr()) {
// Load context from the closure object (first argument).
LocalScope* scope = parsed_function().node_sequence()->scope();
LocalVariable* closure_parameter = scope->VariableAt(0);
// TODO(fschneider): Don't load context for optimized functions that
// don't use it.
__ movl(CTX, Address(EBP, closure_parameter->index() * kWordSize));
__ movl(CTX, FieldAddress(CTX, Closure::context_offset()));
#ifdef DEBUG
Label ok;
__ LoadClassId(EBX, CTX);
__ cmpl(EBX, Immediate(kContextCid));
__ j(EQUAL, &ok, Assembler::kNearJump);
__ Stop("Incorrect context at entry");
__ Bind(&ok);
#endif
}
// In unoptimized code, initialize (non-argument) stack allocated slots to
// null.
if (!is_optimizing()) {
ASSERT(num_locals > 0); // There is always at least context_var.
__ Comment("Initialize spill slots");
const intptr_t slot_base = parsed_function().first_stack_local_index();
const intptr_t context_index =
parsed_function().current_context_var()->index();
if (num_locals > 1) {
const Immediate& raw_null =
Immediate(reinterpret_cast<intptr_t>(Object::null()));
__ movl(EAX, raw_null);
}
for (intptr_t i = 0; i < num_locals; ++i) {
// Subtract index i (locals lie at lower addresses than EBP).
if (((slot_base - i) == context_index)) {
if (function.IsClosureFunction()) {
__ movl(Address(EBP, (slot_base - i) * kWordSize), CTX);
} else {
const Immediate& raw_empty_context =
Immediate(reinterpret_cast<intptr_t>(
isolate()->object_store()->empty_context()));
__ movl(Address(EBP, (slot_base - i) * kWordSize), raw_empty_context);
}
} else {
ASSERT(num_locals > 1);
__ movl(Address(EBP, (slot_base - i) * kWordSize), EAX);
}
}
}
ASSERT(!block_order().is_empty());
VisitBlocks();
__ int3();
GenerateDeferredCode();
if (is_optimizing() && Compiler::allow_recompilation()) {
// Leave enough space for patching in case of lazy deoptimization from
// deferred code.
__ nop(CallPattern::pattern_length_in_bytes());
lazy_deopt_pc_offset_ = assembler()->CodeSize();
__ Jmp(*StubCode::DeoptimizeLazy_entry());
}
}
void FlowGraphCompiler::GenerateCall(intptr_t token_pos,
const StubEntry& stub_entry,
RawPcDescriptors::Kind kind,
LocationSummary* locs) {
__ Call(stub_entry);
AddCurrentDescriptor(kind, Thread::kNoDeoptId, token_pos);
RecordSafepoint(locs);
}
void FlowGraphCompiler::GenerateDartCall(intptr_t deopt_id,
intptr_t token_pos,
const StubEntry& stub_entry,
RawPcDescriptors::Kind kind,
LocationSummary* locs) {
__ Call(stub_entry);
AddCurrentDescriptor(kind, deopt_id, token_pos);
RecordSafepoint(locs);
// Marks either the continuation point in unoptimized code or the
// deoptimization point in optimized code, after call.
const intptr_t deopt_id_after = Thread::ToDeoptAfter(deopt_id);
if (is_optimizing()) {
AddDeoptIndexAtCall(deopt_id_after, token_pos);
} else {
// Add deoptimization continuation point after the call and before the
// arguments are removed.
AddCurrentDescriptor(RawPcDescriptors::kDeopt, deopt_id_after, token_pos);
}
}
void FlowGraphCompiler::GenerateRuntimeCall(intptr_t token_pos,
intptr_t deopt_id,
const RuntimeEntry& entry,
intptr_t argument_count,
LocationSummary* locs) {
__ CallRuntime(entry, argument_count);
AddCurrentDescriptor(RawPcDescriptors::kOther, deopt_id, token_pos);
RecordSafepoint(locs);
if (deopt_id != Thread::kNoDeoptId) {
// Marks either the continuation point in unoptimized code or the
// deoptimization point in optimized code, after call.
const intptr_t deopt_id_after = Thread::ToDeoptAfter(deopt_id);
if (is_optimizing()) {
AddDeoptIndexAtCall(deopt_id_after, token_pos);
} else {
// Add deoptimization continuation point after the call and before the
// arguments are removed.
AddCurrentDescriptor(RawPcDescriptors::kDeopt, deopt_id_after, token_pos);
}
}
}
void FlowGraphCompiler::EmitUnoptimizedStaticCall(
intptr_t argument_count,
intptr_t deopt_id,
intptr_t token_pos,
LocationSummary* locs,
const ICData& ic_data) {
const StubEntry& stub_entry =
*StubCode::UnoptimizedStaticCallEntry(ic_data.NumArgsTested());
__ LoadObject(ECX, ic_data);
GenerateDartCall(deopt_id,
token_pos,
stub_entry,
RawPcDescriptors::kUnoptStaticCall,
locs);
__ Drop(argument_count);
}
void FlowGraphCompiler::EmitEdgeCounter(intptr_t edge_id) {
// We do not check for overflow when incrementing the edge counter. The
// function should normally be optimized long before the counter can
// overflow; and though we do not reset the counters when we optimize or
// deoptimize, there is a bound on the number of
// optimization/deoptimization cycles we will attempt.
ASSERT(!edge_counters_array_.IsNull());
__ Comment("Edge counter");
__ LoadObject(EAX, edge_counters_array_);
__ IncrementSmiField(FieldAddress(EAX, Array::element_offset(edge_id)), 1);
}
void FlowGraphCompiler::EmitOptimizedInstanceCall(
const StubEntry& stub_entry,
const ICData& ic_data,
intptr_t argument_count,
intptr_t deopt_id,
intptr_t token_pos,
LocationSummary* locs) {
ASSERT(Array::Handle(ic_data.arguments_descriptor()).Length() > 0);
// Each ICData propagated from unoptimized to optimized code contains the
// function that corresponds to the Dart function of that IC call. Due
// to inlining in optimized code, that function may not correspond to the
// top-level function (parsed_function().function()) which could be
// reoptimized and which counter needs to be incremented.
// Pass the function explicitly, it is used in IC stub.
__ LoadObject(EBX, parsed_function().function());
__ LoadObject(ECX, ic_data);
GenerateDartCall(deopt_id,
token_pos,
stub_entry,
RawPcDescriptors::kIcCall,
locs);
__ Drop(argument_count);
}
void FlowGraphCompiler::EmitInstanceCall(const StubEntry& stub_entry,
const ICData& ic_data,
intptr_t argument_count,
intptr_t deopt_id,
intptr_t token_pos,
LocationSummary* locs) {
ASSERT(Array::Handle(ic_data.arguments_descriptor()).Length() > 0);
__ LoadObject(ECX, ic_data);
GenerateDartCall(deopt_id,
token_pos,
stub_entry,
RawPcDescriptors::kIcCall,
locs);
__ Drop(argument_count);
}
void FlowGraphCompiler::EmitMegamorphicInstanceCall(
const ICData& ic_data,
intptr_t argument_count,
intptr_t deopt_id,
intptr_t token_pos,
LocationSummary* locs) {
const String& name = String::Handle(zone(), ic_data.target_name());
const Array& arguments_descriptor =
Array::ZoneHandle(zone(), ic_data.arguments_descriptor());
ASSERT(!arguments_descriptor.IsNull() && (arguments_descriptor.Length() > 0));
const MegamorphicCache& cache = MegamorphicCache::ZoneHandle(zone(),
MegamorphicCacheTable::Lookup(isolate(), name, arguments_descriptor));
const Register receiverR = ECX;
const Register cacheR = EBX;
const Register targetR = EBX;
__ movl(receiverR, Address(ESP, (argument_count - 1) * kWordSize));
__ LoadObject(cacheR, cache);
if (FLAG_use_megamorphic_stub) {
__ Call(*StubCode::MegamorphicLookup_entry());
} else {
StubCode::EmitMegamorphicLookup(assembler(), receiverR, cacheR, targetR);
}
__ LoadObject(ECX, ic_data);
__ LoadObject(EDX, arguments_descriptor);
__ call(targetR);
AddCurrentDescriptor(RawPcDescriptors::kOther,
Thread::kNoDeoptId, token_pos);
RecordSafepoint(locs);
const intptr_t deopt_id_after = Thread::ToDeoptAfter(deopt_id);
if (is_optimizing()) {
AddDeoptIndexAtCall(deopt_id_after, token_pos);
} else {
// Add deoptimization continuation point after the call and before the
// arguments are removed.
AddCurrentDescriptor(RawPcDescriptors::kDeopt, deopt_id_after, token_pos);
}
__ Drop(argument_count);
}
void FlowGraphCompiler::EmitOptimizedStaticCall(
const Function& function,
const Array& arguments_descriptor,
intptr_t argument_count,
intptr_t deopt_id,
intptr_t token_pos,
LocationSummary* locs) {
__ LoadObject(EDX, arguments_descriptor);
// Do not use the code from the function, but let the code be patched so that
// we can record the outgoing edges to other code.
GenerateDartCall(deopt_id,
token_pos,
*StubCode::CallStaticFunction_entry(),
RawPcDescriptors::kOther,
locs);
AddStaticCallTarget(function);
__ Drop(argument_count);
}
Condition FlowGraphCompiler::EmitEqualityRegConstCompare(
Register reg,
const Object& obj,
bool needs_number_check,
intptr_t token_pos) {
ASSERT(!needs_number_check ||
(!obj.IsMint() && !obj.IsDouble() && !obj.IsBigint()));
if (obj.IsSmi() && (Smi::Cast(obj).Value() == 0)) {
ASSERT(!needs_number_check);
__ testl(reg, reg);
return EQUAL;
}
if (needs_number_check) {
__ pushl(reg);
__ PushObject(obj);
if (is_optimizing()) {
__ Call(*StubCode::OptimizedIdenticalWithNumberCheck_entry());
} else {
__ Call(*StubCode::UnoptimizedIdenticalWithNumberCheck_entry());
}
if (token_pos != Scanner::kNoSourcePos) {
AddCurrentDescriptor(RawPcDescriptors::kRuntimeCall,
Thread::kNoDeoptId,
token_pos);
}
// Stub returns result in flags (result of a cmpl, we need ZF computed).
__ popl(reg); // Discard constant.
__ popl(reg); // Restore 'reg'.
} else {
__ CompareObject(reg, obj);
}
return EQUAL;
}
Condition FlowGraphCompiler::EmitEqualityRegRegCompare(Register left,
Register right,
bool needs_number_check,
intptr_t token_pos) {
if (needs_number_check) {
__ pushl(left);
__ pushl(right);
if (is_optimizing()) {
__ Call(*StubCode::OptimizedIdenticalWithNumberCheck_entry());
} else {
__ Call(*StubCode::UnoptimizedIdenticalWithNumberCheck_entry());
}
if (token_pos != Scanner::kNoSourcePos) {
AddCurrentDescriptor(RawPcDescriptors::kRuntimeCall,
Thread::kNoDeoptId,
token_pos);
}
// Stub returns result in flags (result of a cmpl, we need ZF computed).
__ popl(right);
__ popl(left);
} else {
__ cmpl(left, right);
}
return EQUAL;
}
// This function must be in sync with FlowGraphCompiler::RecordSafepoint and
// FlowGraphCompiler::SlowPathEnvironmentFor.
void FlowGraphCompiler::SaveLiveRegisters(LocationSummary* locs) {
#if defined(DEBUG)
locs->CheckWritableInputs();
ClobberDeadTempRegisters(locs);
#endif
// TODO(vegorov): consider saving only caller save (volatile) registers.
const intptr_t xmm_regs_count = locs->live_registers()->FpuRegisterCount();
if (xmm_regs_count > 0) {
__ subl(ESP, Immediate(xmm_regs_count * kFpuRegisterSize));
// Store XMM registers with the lowest register number at the lowest
// address.
intptr_t offset = 0;
for (intptr_t i = 0; i < kNumberOfXmmRegisters; ++i) {
XmmRegister xmm_reg = static_cast<XmmRegister>(i);
if (locs->live_registers()->ContainsFpuRegister(xmm_reg)) {
__ movups(Address(ESP, offset), xmm_reg);
offset += kFpuRegisterSize;
}
}
ASSERT(offset == (xmm_regs_count * kFpuRegisterSize));
}
// The order in which the registers are pushed must match the order
// in which the registers are encoded in the safe point's stack map.
for (intptr_t i = kNumberOfCpuRegisters - 1; i >= 0; --i) {
Register reg = static_cast<Register>(i);
if (locs->live_registers()->ContainsRegister(reg)) {
__ pushl(reg);
}
}
}
void FlowGraphCompiler::RestoreLiveRegisters(LocationSummary* locs) {
for (intptr_t i = 0; i < kNumberOfCpuRegisters; ++i) {
Register reg = static_cast<Register>(i);
if (locs->live_registers()->ContainsRegister(reg)) {
__ popl(reg);
}
}
const intptr_t xmm_regs_count = locs->live_registers()->FpuRegisterCount();
if (xmm_regs_count > 0) {
// XMM registers have the lowest register number at the lowest address.
intptr_t offset = 0;
for (intptr_t i = 0; i < kNumberOfXmmRegisters; ++i) {
XmmRegister xmm_reg = static_cast<XmmRegister>(i);
if (locs->live_registers()->ContainsFpuRegister(xmm_reg)) {
__ movups(xmm_reg, Address(ESP, offset));
offset += kFpuRegisterSize;
}
}
ASSERT(offset == (xmm_regs_count * kFpuRegisterSize));
__ addl(ESP, Immediate(offset));
}
}
#if defined(DEBUG)
void FlowGraphCompiler::ClobberDeadTempRegisters(LocationSummary* locs) {
// Clobber temporaries that have not been manually preserved.
for (intptr_t i = 0; i < locs->temp_count(); ++i) {
Location tmp = locs->temp(i);
// TODO(zerny): clobber non-live temporary FPU registers.
if (tmp.IsRegister() &&
!locs->live_registers()->ContainsRegister(tmp.reg())) {
__ movl(tmp.reg(), Immediate(0xf7));
}
}
}
#endif
void FlowGraphCompiler::EmitTestAndCall(const ICData& ic_data,
intptr_t argument_count,
const Array& argument_names,
Label* failed,
Label* match_found,
intptr_t deopt_id,
intptr_t token_index,
LocationSummary* locs) {
ASSERT(is_optimizing());
__ Comment("EmitTestAndCall");
const Array& arguments_descriptor =
Array::ZoneHandle(zone(), ArgumentsDescriptor::New(argument_count,
argument_names));
// Load receiver into EAX.
__ movl(EAX, Address(ESP, (argument_count - 1) * kWordSize));
__ LoadObject(EDX, arguments_descriptor);
const bool kFirstCheckIsSmi = ic_data.GetReceiverClassIdAt(0) == kSmiCid;
const intptr_t kNumChecks = ic_data.NumberOfChecks();
ASSERT(!ic_data.IsNull() && (kNumChecks > 0));
Label after_smi_test;
__ testl(EAX, Immediate(kSmiTagMask));
if (kFirstCheckIsSmi) {
// Jump if receiver is not Smi.
if (kNumChecks == 1) {
__ j(NOT_ZERO, failed);
} else {
__ j(NOT_ZERO, &after_smi_test);
}
// Do not use the code from the function, but let the code be patched so
// that we can record the outgoing edges to other code.
GenerateDartCall(deopt_id,
token_index,
*StubCode::CallStaticFunction_entry(),
RawPcDescriptors::kOther,
locs);
const Function& function = Function::ZoneHandle(
zone(), ic_data.GetTargetAt(0));
AddStaticCallTarget(function);
__ Drop(argument_count);
if (kNumChecks > 1) {
__ jmp(match_found);
}
} else {
// Receiver is Smi, but Smi is not a valid class therefore fail.
// (Smi class must be first in the list).
__ j(ZERO, failed);
}
__ Bind(&after_smi_test);
ASSERT(!ic_data.IsNull() && (kNumChecks > 0));
GrowableArray<CidTarget> sorted(kNumChecks);
SortICDataByCount(ic_data, &sorted, /* drop_smi = */ true);
// Value is not Smi,
// LoadValueCid(this, EDI, EAX, failed);
const intptr_t kSortedLen = sorted.length();
// If kSortedLen is 0 then only a Smi check was needed; the Smi check above
// will fail if there was only one check and receiver is not Smi.
if (kSortedLen == 0) return;
__ LoadClassId(EDI, EAX);
for (intptr_t i = 0; i < kSortedLen; i++) {
const bool kIsLastCheck = (i == (kSortedLen - 1));
ASSERT(sorted[i].cid != kSmiCid);
Label next_test;
__ cmpl(EDI, Immediate(sorted[i].cid));
if (kIsLastCheck) {
__ j(NOT_EQUAL, failed);
} else {
__ j(NOT_EQUAL, &next_test);
}
// Do not use the code from the function, but let the code be patched so
// that we can record the outgoing edges to other code.
GenerateDartCall(deopt_id,
token_index,
*StubCode::CallStaticFunction_entry(),
RawPcDescriptors::kOther,
locs);
const Function& function = *sorted[i].target;
AddStaticCallTarget(function);
__ Drop(argument_count);
if (!kIsLastCheck) {
__ jmp(match_found);
}
__ Bind(&next_test);
}
}
#undef __
#define __ compiler_->assembler()->
void ParallelMoveResolver::EmitMove(int index) {
MoveOperands* move = moves_[index];
const Location source = move->src();
const Location destination = move->dest();
if (source.IsRegister()) {
if (destination.IsRegister()) {
__ movl(destination.reg(), source.reg());
} else {
ASSERT(destination.IsStackSlot());
__ movl(destination.ToStackSlotAddress(), source.reg());
}
} else if (source.IsStackSlot()) {
if (destination.IsRegister()) {
__ movl(destination.reg(), source.ToStackSlotAddress());
} else {
ASSERT(destination.IsStackSlot());
MoveMemoryToMemory(destination.ToStackSlotAddress(),
source.ToStackSlotAddress());
}
} else if (source.IsFpuRegister()) {
if (destination.IsFpuRegister()) {
// Optimization manual recommends using MOVAPS for register
// to register moves.
__ movaps(destination.fpu_reg(), source.fpu_reg());
} else {
if (destination.IsDoubleStackSlot()) {
__ movsd(destination.ToStackSlotAddress(), source.fpu_reg());
} else {
ASSERT(destination.IsQuadStackSlot());
__ movups(destination.ToStackSlotAddress(), source.fpu_reg());
}
}
} else if (source.IsDoubleStackSlot()) {
if (destination.IsFpuRegister()) {
__ movsd(destination.fpu_reg(), source.ToStackSlotAddress());
} else {
ASSERT(destination.IsDoubleStackSlot());
__ movsd(XMM0, source.ToStackSlotAddress());
__ movsd(destination.ToStackSlotAddress(), XMM0);
}
} else if (source.IsQuadStackSlot()) {
if (destination.IsFpuRegister()) {
__ movups(destination.fpu_reg(), source.ToStackSlotAddress());
} else {
ASSERT(destination.IsQuadStackSlot());
__ movups(XMM0, source.ToStackSlotAddress());
__ movups(destination.ToStackSlotAddress(), XMM0);
}
} else {
ASSERT(source.IsConstant());
if (destination.IsRegister()) {
const Object& constant = source.constant();
if (constant.IsSmi() && (Smi::Cast(constant).Value() == 0)) {
__ xorl(destination.reg(), destination.reg());
} else if (constant.IsSmi() &&
(source.constant_instruction()->representation() == kUnboxedInt32)) {
__ movl(destination.reg(), Immediate(Smi::Cast(constant).Value()));
} else {
__ LoadObjectSafely(destination.reg(), constant);
}
} else if (destination.IsFpuRegister()) {
const Double& constant = Double::Cast(source.constant());
uword addr = FlowGraphBuilder::FindDoubleConstant(constant.value());
if (addr == 0) {
__ pushl(EAX);
__ LoadObject(EAX, constant);
__ movsd(destination.fpu_reg(),
FieldAddress(EAX, Double::value_offset()));
__ popl(EAX);
} else if (Utils::DoublesBitEqual(constant.value(), 0.0)) {
__ xorps(destination.fpu_reg(), destination.fpu_reg());
} else {
__ movsd(destination.fpu_reg(), Address::Absolute(addr));
}
} else if (destination.IsDoubleStackSlot()) {
const Double& constant = Double::Cast(source.constant());
uword addr = FlowGraphBuilder::FindDoubleConstant(constant.value());
if (addr == 0) {
__ pushl(EAX);
__ LoadObject(EAX, constant);
__ movsd(XMM0, FieldAddress(EAX, Double::value_offset()));
__ popl(EAX);
} else if (Utils::DoublesBitEqual(constant.value(), 0.0)) {
__ xorps(XMM0, XMM0);
} else {
__ movsd(XMM0, Address::Absolute(addr));
}
__ movsd(destination.ToStackSlotAddress(), XMM0);
} else {
ASSERT(destination.IsStackSlot());
const Object& constant = source.constant();
if (constant.IsSmi() &&
(source.constant_instruction()->representation() == kUnboxedInt32)) {
__ movl(destination.ToStackSlotAddress(),
Immediate(Smi::Cast(constant).Value()));
} else {
StoreObject(destination.ToStackSlotAddress(), source.constant());
}
}
}
move->Eliminate();
}
void ParallelMoveResolver::EmitSwap(int index) {
MoveOperands* move = moves_[index];
const Location source = move->src();
const Location destination = move->dest();
if (source.IsRegister() && destination.IsRegister()) {
__ xchgl(destination.reg(), source.reg());
} else if (source.IsRegister() && destination.IsStackSlot()) {
Exchange(source.reg(), destination.ToStackSlotAddress());
} else if (source.IsStackSlot() && destination.IsRegister()) {
Exchange(destination.reg(), source.ToStackSlotAddress());
} else if (source.IsStackSlot() && destination.IsStackSlot()) {
Exchange(destination.ToStackSlotAddress(), source.ToStackSlotAddress());
} else if (source.IsFpuRegister() && destination.IsFpuRegister()) {
__ movaps(XMM0, source.fpu_reg());
__ movaps(source.fpu_reg(), destination.fpu_reg());
__ movaps(destination.fpu_reg(), XMM0);
} else if (source.IsFpuRegister() || destination.IsFpuRegister()) {
ASSERT(destination.IsDoubleStackSlot() ||
destination.IsQuadStackSlot() ||
source.IsDoubleStackSlot() ||
source.IsQuadStackSlot());
bool double_width = destination.IsDoubleStackSlot() ||
source.IsDoubleStackSlot();
XmmRegister reg = source.IsFpuRegister() ? source.fpu_reg()
: destination.fpu_reg();
const Address& slot_address = source.IsFpuRegister()
? destination.ToStackSlotAddress()
: source.ToStackSlotAddress();
if (double_width) {
__ movsd(XMM0, slot_address);
__ movsd(slot_address, reg);
} else {
__ movups(XMM0, slot_address);
__ movups(slot_address, reg);
}
__ movaps(reg, XMM0);
} else if (source.IsDoubleStackSlot() && destination.IsDoubleStackSlot()) {
const Address& source_slot_address = source.ToStackSlotAddress();
const Address& destination_slot_address = destination.ToStackSlotAddress();
ScratchFpuRegisterScope ensure_scratch(this, XMM0);
__ movsd(XMM0, source_slot_address);
__ movsd(ensure_scratch.reg(), destination_slot_address);
__ movsd(destination_slot_address, XMM0);
__ movsd(source_slot_address, ensure_scratch.reg());
} else if (source.IsQuadStackSlot() && destination.IsQuadStackSlot()) {
const Address& source_slot_address = source.ToStackSlotAddress();
const Address& destination_slot_address = destination.ToStackSlotAddress();
ScratchFpuRegisterScope ensure_scratch(this, XMM0);
__ movups(XMM0, source_slot_address);
__ movups(ensure_scratch.reg(), destination_slot_address);
__ movups(destination_slot_address, XMM0);
__ movups(source_slot_address, ensure_scratch.reg());
} else {
UNREACHABLE();
}
// The swap of source and destination has executed a move from source to
// destination.
move->Eliminate();
// Any unperformed (including pending) move with a source of either
// this move's source or destination needs to have their source
// changed to reflect the state of affairs after the swap.
for (int i = 0; i < moves_.length(); ++i) {
const MoveOperands& other_move = *moves_[i];
if (other_move.Blocks(source)) {
moves_[i]->set_src(destination);
} else if (other_move.Blocks(destination)) {
moves_[i]->set_src(source);
}
}
}
void ParallelMoveResolver::MoveMemoryToMemory(const Address& dst,
const Address& src) {
ScratchRegisterScope ensure_scratch(this, kNoRegister);
__ movl(ensure_scratch.reg(), src);
__ movl(dst, ensure_scratch.reg());
}
void ParallelMoveResolver::StoreObject(const Address& dst, const Object& obj) {
if (Assembler::IsSafeSmi(obj) || obj.IsNull()) {
__ movl(dst, Immediate(reinterpret_cast<int32_t>(obj.raw())));
} else {
ScratchRegisterScope ensure_scratch(this, kNoRegister);
__ LoadObjectSafely(ensure_scratch.reg(), obj);
__ movl(dst, ensure_scratch.reg());
}
}
void ParallelMoveResolver::Exchange(Register reg, const Address& mem) {
ScratchRegisterScope ensure_scratch(this, reg);
__ movl(ensure_scratch.reg(), mem);
__ movl(mem, reg);
__ movl(reg, ensure_scratch.reg());
}
void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
ScratchRegisterScope ensure_scratch1(this, kNoRegister);
ScratchRegisterScope ensure_scratch2(this, ensure_scratch1.reg());
__ movl(ensure_scratch1.reg(), mem1);
__ movl(ensure_scratch2.reg(), mem2);
__ movl(mem2, ensure_scratch1.reg());
__ movl(mem1, ensure_scratch2.reg());
}
void ParallelMoveResolver::Exchange(Register reg,
Register base_reg,
intptr_t stack_offset) {
UNREACHABLE();
}
void ParallelMoveResolver::Exchange(Register base_reg1,
intptr_t stack_offset1,
Register base_reg2,
intptr_t stack_offset2) {
UNREACHABLE();
}
void ParallelMoveResolver::SpillScratch(Register reg) {
__ pushl(reg);
}
void ParallelMoveResolver::RestoreScratch(Register reg) {
__ popl(reg);
}
void ParallelMoveResolver::SpillFpuScratch(FpuRegister reg) {
__ subl(ESP, Immediate(kFpuRegisterSize));
__ movups(Address(ESP, 0), reg);
}
void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
__ movups(reg, Address(ESP, 0));
__ addl(ESP, Immediate(kFpuRegisterSize));
}
#undef __
} // namespace dart
#endif // defined TARGET_ARCH_IA32