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dart / sdk / f34ddb39f43f77376b83178fc5b36823869e0214 / . / runtime / vm / regexp_assembler_ir.cc
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// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#if !defined(DART_PRECOMPILED_RUNTIME)
#include "vm/regexp_assembler_ir.h"
#include <utility>
#include "platform/unicode.h"
#include "vm/bit_vector.h"
#include "vm/compiler/backend/il_printer.h"
#include "vm/compiler/frontend/flow_graph_builder.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/compiler/runtime_api.h"
#include "vm/dart_entry.h"
#include "vm/longjump.h"
#include "vm/object_store.h"
#include "vm/regexp.h"
#include "vm/resolver.h"
#include "vm/runtime_entry.h"
#include "vm/stack_frame.h"
#define Z zone()
// Debugging output macros. TAG() is called at the head of each interesting
// function and prints its name during execution if irregexp tracing is enabled.
#define TAG() \
if (FLAG_trace_irregexp) { \
TAG_(); \
}
#define TAG_() \
Print(Bind(new (Z) ConstantInstr(String::ZoneHandle( \
Z, Symbols::FromConcat(thread_, String::Handle(String::New("TAG: ")), \
String::Handle(String::New(__FUNCTION__)))))));
#define PRINT(arg) \
if (FLAG_trace_irregexp) { \
Print(arg); \
}
namespace dart {
/*
* This assembler uses the following main local variables:
* - stack_: A pointer to a growable list which we use as an all-purpose stack
* storing backtracking offsets, positions & stored register values.
* - current_character_: Stores the currently loaded characters (possibly more
* than one).
* - current_position_: The current position within the string, stored as a
* negative offset from the end of the string (i.e. the
* position corresponding to str[0] is -str.length).
* Note that current_position_ is *not* byte-based, unlike
* original V8 code.
*
* Results are returned though an array of capture indices, stored at
* matches_param_. A null array specifies a failure to match. The match indices
* [start_inclusive, end_exclusive] for capture group i are stored at positions
* matches_param_[i * 2] and matches_param_[i * 2 + 1], respectively. Match
* indices of -1 denote non-matched groups. Note that we store these indices
* as a negative offset from the end of the string in registers_array_
* during processing, and convert them to standard indexes when copying them
* to matches_param_ on successful match.
*/
IRRegExpMacroAssembler::IRRegExpMacroAssembler(
intptr_t specialization_cid,
intptr_t capture_count,
const ParsedFunction* parsed_function,
const ZoneGrowableArray<const ICData*>& ic_data_array,
intptr_t osr_id,
Zone* zone)
: RegExpMacroAssembler(zone),
thread_(Thread::Current()),
specialization_cid_(specialization_cid),
parsed_function_(parsed_function),
ic_data_array_(ic_data_array),
current_instruction_(nullptr),
stack_(nullptr),
stack_pointer_(nullptr),
current_character_(nullptr),
current_position_(nullptr),
string_param_(nullptr),
string_param_length_(nullptr),
start_index_param_(nullptr),
registers_count_(0),
saved_registers_count_((capture_count + 1) * 2),
// B0 is taken by GraphEntry thus block ids must start at 1.
block_id_(1) {
switch (specialization_cid) {
case kOneByteStringCid:
case kExternalOneByteStringCid:
mode_ = ASCII;
break;
case kTwoByteStringCid:
case kExternalTwoByteStringCid:
mode_ = UC16;
break;
default:
UNREACHABLE();
}
InitializeLocals();
// Create and generate all preset blocks.
entry_block_ = new (zone) GraphEntryInstr(*parsed_function_, osr_id);
auto function_entry = new (zone) FunctionEntryInstr(
entry_block_, block_id_.Alloc(), kInvalidTryIndex, GetNextDeoptId());
entry_block_->set_normal_entry(function_entry);
start_block_ = new (zone)
JoinEntryInstr(block_id_.Alloc(), kInvalidTryIndex, GetNextDeoptId());
success_block_ = new (zone)
JoinEntryInstr(block_id_.Alloc(), kInvalidTryIndex, GetNextDeoptId());
backtrack_block_ = new (zone)
JoinEntryInstr(block_id_.Alloc(), kInvalidTryIndex, GetNextDeoptId());
exit_block_ = new (zone)
JoinEntryInstr(block_id_.Alloc(), kInvalidTryIndex, GetNextDeoptId());
GenerateEntryBlock();
GenerateSuccessBlock();
GenerateExitBlock();
blocks_.Add(entry_block_);
blocks_.Add(entry_block_->normal_entry());
blocks_.Add(start_block_);
blocks_.Add(success_block_);
blocks_.Add(backtrack_block_);
blocks_.Add(exit_block_);
// Begin emission at the start_block_.
set_current_instruction(start_block_);
}
IRRegExpMacroAssembler::~IRRegExpMacroAssembler() {}
void IRRegExpMacroAssembler::InitializeLocals() {
// All generated functions are expected to have a current-context variable.
// This variable is unused in irregexp functions.
parsed_function_->current_context_var()->set_index(
VariableIndex(GetNextLocalIndex()));
// Create local variables and parameters.
stack_ = Local(Symbols::stack());
stack_pointer_ = Local(Symbols::stack_pointer());
registers_ = Local(Symbols::position_registers());
current_character_ = Local(Symbols::current_character());
current_position_ = Local(Symbols::current_position());
string_param_length_ = Local(Symbols::string_param_length());
capture_length_ = Local(Symbols::capture_length());
match_start_index_ = Local(Symbols::match_start_index());
capture_start_index_ = Local(Symbols::capture_start_index());
match_end_index_ = Local(Symbols::match_end_index());
char_in_capture_ = Local(Symbols::char_in_capture());
char_in_match_ = Local(Symbols::char_in_match());
index_temp_ = Local(Symbols::index_temp());
result_ = Local(Symbols::c_result());
string_param_ = Parameter(Symbols::string_param(),
RegExpMacroAssembler::kParamStringIndex);
start_index_param_ = Parameter(Symbols::start_index_param(),
RegExpMacroAssembler::kParamStartOffsetIndex);
}
void IRRegExpMacroAssembler::GenerateEntryBlock() {
set_current_instruction(entry_block_->normal_entry());
TAG();
// Store string.length.
Value* string_push = PushLocal(string_param_);
StoreLocal(string_param_length_,
Bind(InstanceCall(InstanceCallDescriptor(String::ZoneHandle(
Field::GetterSymbol(Symbols::Length()))),
string_push)));
// Store (start_index - string.length) as the current position (since it's a
// negative offset from the end of the string).
Value* start_index_push = PushLocal(start_index_param_);
Value* length_push = PushLocal(string_param_length_);
StoreLocal(current_position_, Bind(Sub(start_index_push, length_push)));
{
const Library& lib = Library::Handle(Library::CoreLibrary());
const Class& regexp_class =
Class::Handle(lib.LookupClassAllowPrivate(Symbols::_RegExp()));
const Function& get_registers_function = Function::ZoneHandle(
Z, regexp_class.LookupFunctionAllowPrivate(Symbols::_getRegisters()));
// The "0" placeholder constant will be replaced with correct value
// determined at the end of regexp graph construction in Finalization.
num_registers_constant_instr =
new (Z) ConstantInstr(Integer::ZoneHandle(Z, Integer::NewCanonical(0)));
StoreLocal(registers_, Bind(StaticCall(get_registers_function,
Bind(num_registers_constant_instr),
ICData::kStatic)));
const Field& backtracking_stack_field =
Field::ZoneHandle(Z, regexp_class.LookupStaticFieldAllowPrivate(
Symbols::_backtrackingStack()));
StoreLocal(stack_, Bind(LoadStaticField(backtracking_stack_field,
/*calls_initializer=*/true)));
}
ClearRegisters(0, saved_registers_count_ - 1);
StoreLocal(stack_pointer_, Bind(Int64Constant(-1)));
// Jump to the start block.
current_instruction_->Goto(start_block_);
}
void IRRegExpMacroAssembler::GenerateBacktrackBlock() {
set_current_instruction(backtrack_block_);
TAG();
CheckPreemption(/*is_backtrack=*/true);
const intptr_t entries_count = entry_block_->indirect_entries().length();
Value* block_id_push = Bind(PopStack());
backtrack_goto_ = new (Z) IndirectGotoInstr(entries_count, block_id_push);
CloseBlockWith(backtrack_goto_);
// Add an edge from the "indirect" goto to each of the targets.
for (intptr_t j = 0; j < entries_count; j++) {
backtrack_goto_->AddSuccessor(
TargetWithJoinGoto(entry_block_->indirect_entries().At(j)));
}
}
void IRRegExpMacroAssembler::GenerateSuccessBlock() {
set_current_instruction(success_block_);
TAG();
Value* type = Bind(new (Z) ConstantInstr(TypeArguments::ZoneHandle(
Z, IsolateGroup::Current()->object_store()->type_argument_int())));
Value* length = Bind(Uint64Constant(saved_registers_count_));
Value* array = Bind(new (Z) CreateArrayInstr(InstructionSource(), type,
length, GetNextDeoptId()));
StoreLocal(result_, array);
// Store captured offsets in the `matches` parameter.
for (intptr_t i = 0; i < saved_registers_count_; i++) {
Value* matches_push = PushLocal(result_);
Value* index_push = Bind(Uint64Constant(i));
// Convert negative offsets from the end of the string to string indices.
// TODO(zerny): use positive offsets from the get-go.
Value* offset_push = LoadRegister(i);
Value* len_push = PushLocal(string_param_length_);
Value* value_push = Bind(Add(offset_push, len_push));
Do(InstanceCall(InstanceCallDescriptor::FromToken(Token::kASSIGN_INDEX),
matches_push, index_push, value_push));
}
// Print the result if tracing.
PRINT(PushLocal(result_));
// Return true on success.
AppendInstruction(new (Z) ReturnInstr(
InstructionSource(), Bind(LoadLocal(result_)), GetNextDeoptId()));
}
void IRRegExpMacroAssembler::GenerateExitBlock() {
set_current_instruction(exit_block_);
TAG();
// Return false on failure.
AppendInstruction(new (Z) ReturnInstr(
InstructionSource(), Bind(LoadLocal(result_)), GetNextDeoptId()));
}
void IRRegExpMacroAssembler::FinalizeRegistersArray() {
ASSERT(registers_count_ >= saved_registers_count_);
ConstantInstr* new_constant = Int64Constant(registers_count_);
new_constant->set_temp_index(num_registers_constant_instr->temp_index());
num_registers_constant_instr->ReplaceWith(new_constant, /*iterator=*/nullptr);
}
bool IRRegExpMacroAssembler::CanReadUnaligned() {
return !slow_safe();
}
ArrayPtr IRRegExpMacroAssembler::Execute(const RegExp& regexp,
const String& input,
const Smi& start_offset,
bool sticky,
Zone* zone) {
const intptr_t cid = input.GetClassId();
const Function& fun = Function::Handle(regexp.function(cid, sticky));
ASSERT(!fun.IsNull());
// Create the argument list.
const Array& args =
Array::Handle(Array::New(RegExpMacroAssembler::kParamCount));
args.SetAt(RegExpMacroAssembler::kParamRegExpIndex, regexp);
args.SetAt(RegExpMacroAssembler::kParamStringIndex, input);
args.SetAt(RegExpMacroAssembler::kParamStartOffsetIndex, start_offset);
// And finally call the generated code.
const Object& retval =
Object::Handle(zone, DartEntry::InvokeFunction(fun, args));
if (retval.IsLanguageError()) {
Exceptions::ThrowCompileTimeError(LanguageError::Cast(retval));
UNREACHABLE();
}
if (retval.IsError()) {
Exceptions::PropagateError(Error::Cast(retval));
}
if (retval.IsNull()) {
return Array::null();
}
ASSERT(retval.IsArray());
return Array::Cast(retval).ptr();
}
LocalVariable* IRRegExpMacroAssembler::Parameter(const String& name,
intptr_t index) const {
LocalVariable* local =
new (Z) LocalVariable(TokenPosition::kNoSource, TokenPosition::kNoSource,
name, Object::dynamic_type());
intptr_t param_frame_index = kParamCount - index;
local->set_index(VariableIndex(param_frame_index));
return local;
}
LocalVariable* IRRegExpMacroAssembler::Local(const String& name) {
LocalVariable* local =
new (Z) LocalVariable(TokenPosition::kNoSource, TokenPosition::kNoSource,
name, Object::dynamic_type());
local->set_index(VariableIndex(GetNextLocalIndex()));
return local;
}
ConstantInstr* IRRegExpMacroAssembler::Int64Constant(int64_t value) const {
return new (Z)
ConstantInstr(Integer::ZoneHandle(Z, Integer::NewCanonical(value)));
}
ConstantInstr* IRRegExpMacroAssembler::Uint64Constant(uint64_t value) const {
ASSERT(value < static_cast<uint64_t>(kMaxInt64));
return Int64Constant(static_cast<int64_t>(value));
}
ConstantInstr* IRRegExpMacroAssembler::BoolConstant(bool value) const {
return new (Z) ConstantInstr(value ? Bool::True() : Bool::False());
}
ConstantInstr* IRRegExpMacroAssembler::StringConstant(const char* value) const {
return new (Z)
ConstantInstr(String::ZoneHandle(Z, String::New(value, Heap::kOld)));
}
ConstantInstr* IRRegExpMacroAssembler::WordCharacterMapConstant() const {
const Library& lib = Library::Handle(Z, Library::CoreLibrary());
const Class& regexp_class =
Class::Handle(Z, lib.LookupClassAllowPrivate(Symbols::_RegExp()));
const Field& word_character_field = Field::ZoneHandle(
Z,
regexp_class.LookupStaticFieldAllowPrivate(Symbols::_wordCharacterMap()));
ASSERT(!word_character_field.IsNull());
DEBUG_ASSERT(Thread::Current()->TopErrorHandlerIsSetJump());
const auto& value =
Object::Handle(Z, word_character_field.StaticConstFieldValue());
if (value.IsError()) {
Report::LongJump(Error::Cast(value));
}
return new (Z)
ConstantInstr(Instance::ZoneHandle(Z, Instance::RawCast(value.ptr())));
}
ComparisonInstr* IRRegExpMacroAssembler::Comparison(ComparisonKind kind,
Value* lhs,
Value* rhs) {
Token::Kind strict_comparison = Token::kEQ_STRICT;
Token::Kind intermediate_operator = Token::kILLEGAL;
switch (kind) {
case kEQ:
intermediate_operator = Token::kEQ;
break;
case kNE:
intermediate_operator = Token::kEQ;
strict_comparison = Token::kNE_STRICT;
break;
case kLT:
intermediate_operator = Token::kLT;
break;
case kGT:
intermediate_operator = Token::kGT;
break;
case kLTE:
intermediate_operator = Token::kLTE;
break;
case kGTE:
intermediate_operator = Token::kGTE;
break;
default:
UNREACHABLE();
}
ASSERT(intermediate_operator != Token::kILLEGAL);
Value* lhs_value = Bind(InstanceCall(
InstanceCallDescriptor::FromToken(intermediate_operator), lhs, rhs));
Value* rhs_value = Bind(BoolConstant(true));
return new (Z)
StrictCompareInstr(InstructionSource(), strict_comparison, lhs_value,
rhs_value, true, GetNextDeoptId());
}
ComparisonInstr* IRRegExpMacroAssembler::Comparison(ComparisonKind kind,
Definition* lhs,
Definition* rhs) {
Value* lhs_push = Bind(lhs);
Value* rhs_push = Bind(rhs);
return Comparison(kind, lhs_push, rhs_push);
}
StaticCallInstr* IRRegExpMacroAssembler::StaticCall(
const Function& function,
ICData::RebindRule rebind_rule) const {
InputsArray arguments(Z, 0);
return StaticCall(function, std::move(arguments), rebind_rule);
}
StaticCallInstr* IRRegExpMacroAssembler::StaticCall(
const Function& function,
Value* arg1,
ICData::RebindRule rebind_rule) const {
InputsArray arguments(Z, 1);
arguments.Add(arg1);
return StaticCall(function, std::move(arguments), rebind_rule);
}
StaticCallInstr* IRRegExpMacroAssembler::StaticCall(
const Function& function,
Value* arg1,
Value* arg2,
ICData::RebindRule rebind_rule) const {
InputsArray arguments(Z, 2);
arguments.Add(arg1);
arguments.Add(arg2);
return StaticCall(function, std::move(arguments), rebind_rule);
}
StaticCallInstr* IRRegExpMacroAssembler::StaticCall(
const Function& function,
InputsArray&& arguments,
ICData::RebindRule rebind_rule) const {
const intptr_t kTypeArgsLen = 0;
return new (Z) StaticCallInstr(InstructionSource(), function, kTypeArgsLen,
Object::null_array(), std::move(arguments),
ic_data_array_, GetNextDeoptId(), rebind_rule);
}
InstanceCallInstr* IRRegExpMacroAssembler::InstanceCall(
const InstanceCallDescriptor& desc,
Value* arg1) const {
InputsArray arguments(Z, 1);
arguments.Add(arg1);
return InstanceCall(desc, std::move(arguments));
}
InstanceCallInstr* IRRegExpMacroAssembler::InstanceCall(
const InstanceCallDescriptor& desc,
Value* arg1,
Value* arg2) const {
InputsArray arguments(Z, 2);
arguments.Add(arg1);
arguments.Add(arg2);
return InstanceCall(desc, std::move(arguments));
}
InstanceCallInstr* IRRegExpMacroAssembler::InstanceCall(
const InstanceCallDescriptor& desc,
Value* arg1,
Value* arg2,
Value* arg3) const {
InputsArray arguments(Z, 3);
arguments.Add(arg1);
arguments.Add(arg2);
arguments.Add(arg3);
return InstanceCall(desc, std::move(arguments));
}
InstanceCallInstr* IRRegExpMacroAssembler::InstanceCall(
const InstanceCallDescriptor& desc,
InputsArray&& arguments) const {
const intptr_t kTypeArgsLen = 0;
return new (Z) InstanceCallInstr(
InstructionSource(), desc.name, desc.token_kind, std::move(arguments),
kTypeArgsLen, Object::null_array(), desc.checked_argument_count,
ic_data_array_, GetNextDeoptId());
}
LoadLocalInstr* IRRegExpMacroAssembler::LoadLocal(LocalVariable* local) const {
return new (Z) LoadLocalInstr(*local, InstructionSource());
}
void IRRegExpMacroAssembler::StoreLocal(LocalVariable* local, Value* value) {
Do(new (Z) StoreLocalInstr(*local, value, InstructionSource()));
}
LoadStaticFieldInstr* IRRegExpMacroAssembler::LoadStaticField(
const Field& field,
bool calls_initializer) const {
return new (Z) LoadStaticFieldInstr(field, InstructionSource(),
calls_initializer, GetNextDeoptId());
}
void IRRegExpMacroAssembler::set_current_instruction(Instruction* instruction) {
current_instruction_ = instruction;
}
Value* IRRegExpMacroAssembler::Bind(Definition* definition) {
AppendInstruction(definition);
definition->set_temp_index(temp_id_.Alloc());
return new (Z) Value(definition);
}
void IRRegExpMacroAssembler::Do(Definition* definition) {
AppendInstruction(definition);
}
Value* IRRegExpMacroAssembler::BindLoadLocal(const LocalVariable& local) {
ASSERT(!local.is_captured());
return Bind(new (Z) LoadLocalInstr(local, InstructionSource()));
}
// In some cases, the V8 irregexp engine generates unreachable code by emitting
// a jmp not followed by a bind. We cannot do the same, since it is impossible
// to append to a block following a jmp. In such cases, assume that we are doing
// the correct thing, but output a warning when tracing.
#define HANDLE_DEAD_CODE_EMISSION() \
if (current_instruction_ == nullptr) { \
if (FLAG_trace_irregexp) { \
OS::PrintErr( \
"WARNING: Attempting to append to a closed assembler. " \
"This could be either a bug or generation of dead code " \
"inherited from V8.\n"); \
} \
BlockLabel dummy; \
BindBlock(&dummy); \
}
void IRRegExpMacroAssembler::AppendInstruction(Instruction* instruction) {
HANDLE_DEAD_CODE_EMISSION();
ASSERT(current_instruction_ != nullptr);
ASSERT(current_instruction_->next() == nullptr);
temp_id_.Dealloc(instruction->InputCount());
current_instruction_->LinkTo(instruction);
set_current_instruction(instruction);
}
void IRRegExpMacroAssembler::CloseBlockWith(Instruction* instruction) {
HANDLE_DEAD_CODE_EMISSION();
ASSERT(current_instruction_ != nullptr);
ASSERT(current_instruction_->next() == nullptr);
temp_id_.Dealloc(instruction->InputCount());
current_instruction_->LinkTo(instruction);
set_current_instruction(nullptr);
}
void IRRegExpMacroAssembler::GoTo(BlockLabel* to) {
if (to == nullptr) {
Backtrack();
} else {
to->SetLinked();
GoTo(to->block());
}
}
// Closes the current block with a goto, and unsets current_instruction_.
// BindBlock() must be called before emission can continue.
void IRRegExpMacroAssembler::GoTo(JoinEntryInstr* to) {
HANDLE_DEAD_CODE_EMISSION();
ASSERT(current_instruction_ != nullptr);
ASSERT(current_instruction_->next() == nullptr);
current_instruction_->Goto(to);
set_current_instruction(nullptr);
}
Value* IRRegExpMacroAssembler::PushLocal(LocalVariable* local) {
return Bind(LoadLocal(local));
}
void IRRegExpMacroAssembler::Print(const char* str) {
Print(Bind(new (Z) ConstantInstr(
String::ZoneHandle(Z, String::New(str, Heap::kOld)))));
}
void IRRegExpMacroAssembler::Print(Value* argument) {
const Library& lib = Library::Handle(Library::CoreLibrary());
const Function& print_fn =
Function::ZoneHandle(Z, lib.LookupFunctionAllowPrivate(Symbols::print()));
Do(StaticCall(print_fn, argument, ICData::kStatic));
}
void IRRegExpMacroAssembler::PrintBlocks() {
for (intptr_t i = 0; i < blocks_.length(); i++) {
FlowGraphPrinter::PrintBlock(blocks_[i], false);
}
}
intptr_t IRRegExpMacroAssembler::stack_limit_slack() {
return 32;
}
void IRRegExpMacroAssembler::AdvanceCurrentPosition(intptr_t by) {
TAG();
if (by != 0) {
Value* cur_pos_push = PushLocal(current_position_);
Value* by_push = Bind(Int64Constant(by));
Value* new_pos_value = Bind(Add(cur_pos_push, by_push));
StoreLocal(current_position_, new_pos_value);
}
}
void IRRegExpMacroAssembler::AdvanceRegister(intptr_t reg, intptr_t by) {
TAG();
ASSERT(reg >= 0);
ASSERT(reg < registers_count_);
if (by != 0) {
Value* registers_push = PushLocal(registers_);
Value* index_push = PushRegisterIndex(reg);
Value* reg_push = LoadRegister(reg);
Value* by_push = Bind(Int64Constant(by));
Value* value_push = Bind(Add(reg_push, by_push));
StoreRegister(registers_push, index_push, value_push);
}
}
void IRRegExpMacroAssembler::Backtrack() {
TAG();
GoTo(backtrack_block_);
}
// A BindBlock is analogous to assigning a label to a basic block.
// If the BlockLabel does not yet contain a block, it is created.
// If there is a current instruction, append a goto to the bound block.
void IRRegExpMacroAssembler::BindBlock(BlockLabel* label) {
ASSERT(!label->is_bound());
ASSERT(label->block()->next() == nullptr);
label->BindTo(block_id_.Alloc());
blocks_.Add(label->block());
if (current_instruction_ != nullptr) {
GoTo(label);
}
set_current_instruction(label->block());
// Print the id of the current block if tracing.
PRINT(Bind(Uint64Constant(label->block()->block_id())));
}
intptr_t IRRegExpMacroAssembler::GetNextLocalIndex() {
intptr_t id = local_id_.Alloc();
return -id;
}
Value* IRRegExpMacroAssembler::LoadRegister(intptr_t index) {
Value* registers_push = PushLocal(registers_);
Value* index_push = PushRegisterIndex(index);
return Bind(InstanceCall(InstanceCallDescriptor::FromToken(Token::kINDEX),
registers_push, index_push));
}
void IRRegExpMacroAssembler::StoreRegister(intptr_t index, intptr_t value) {
Value* registers_push = PushLocal(registers_);
Value* index_push = PushRegisterIndex(index);
Value* value_push = Bind(Uint64Constant(value));
StoreRegister(registers_push, index_push, value_push);
}
void IRRegExpMacroAssembler::StoreRegister(Value* registers,
Value* index,
Value* value) {
TAG();
Do(InstanceCall(InstanceCallDescriptor::FromToken(Token::kASSIGN_INDEX),
registers, index, value));
}
Value* IRRegExpMacroAssembler::PushRegisterIndex(intptr_t index) {
if (registers_count_ <= index) {
registers_count_ = index + 1;
}
return Bind(Uint64Constant(index));
}
void IRRegExpMacroAssembler::CheckCharacter(uint32_t c, BlockLabel* on_equal) {
TAG();
Definition* cur_char_def = LoadLocal(current_character_);
Definition* char_def = Uint64Constant(c);
BranchOrBacktrack(Comparison(kEQ, cur_char_def, char_def), on_equal);
}
void IRRegExpMacroAssembler::CheckCharacterGT(uint16_t limit,
BlockLabel* on_greater) {
TAG();
BranchOrBacktrack(
Comparison(kGT, LoadLocal(current_character_), Uint64Constant(limit)),
on_greater);
}
void IRRegExpMacroAssembler::CheckAtStart(BlockLabel* on_at_start) {
TAG();
// Are we at the start of the input, i.e. is (offset == string_length * -1)?
Definition* neg_len_def =
InstanceCall(InstanceCallDescriptor::FromToken(Token::kNEGATE),
PushLocal(string_param_length_));
Definition* offset_def = LoadLocal(current_position_);
BranchOrBacktrack(Comparison(kEQ, neg_len_def, offset_def), on_at_start);
}
// cp_offset => offset from the current (character) pointer
// This offset may be negative due to traversing backwards during lookbehind.
void IRRegExpMacroAssembler::CheckNotAtStart(intptr_t cp_offset,
BlockLabel* on_not_at_start) {
TAG();
// Are we at the start of the input, i.e. is (offset == string_length * -1)?
auto neg_len_def =
Bind(InstanceCall(InstanceCallDescriptor::FromToken(Token::kNEGATE),
PushLocal(string_param_length_)));
auto current_pos_def = PushLocal(current_position_);
auto cp_offset_def = Bind(Int64Constant(cp_offset));
auto offset_def = Bind(Add(current_pos_def, cp_offset_def));
BranchOrBacktrack(Comparison(kNE, neg_len_def, offset_def), on_not_at_start);
}
void IRRegExpMacroAssembler::CheckCharacterLT(uint16_t limit,
BlockLabel* on_less) {
TAG();
BranchOrBacktrack(
Comparison(kLT, LoadLocal(current_character_), Uint64Constant(limit)),
on_less);
}
void IRRegExpMacroAssembler::CheckGreedyLoop(BlockLabel* on_equal) {
TAG();
BlockLabel fallthrough;
Definition* head = PeekStack();
Definition* cur_pos_def = LoadLocal(current_position_);
BranchOrBacktrack(Comparison(kNE, head, cur_pos_def), &fallthrough);
// Pop, throwing away the value.
Do(PopStack());
BranchOrBacktrack(nullptr, on_equal);
BindBlock(&fallthrough);
}
void IRRegExpMacroAssembler::CheckNotBackReferenceIgnoreCase(
intptr_t start_reg,
bool read_backward,
bool unicode,
BlockLabel* on_no_match) {
TAG();
ASSERT(start_reg + 1 <= registers_count_);
BlockLabel fallthrough;
Value* end_push = LoadRegister(start_reg + 1);
Value* start_push = LoadRegister(start_reg);
StoreLocal(capture_length_, Bind(Sub(end_push, start_push)));
// The length of a capture should not be negative. This can only happen
// if the end of the capture is unrecorded, or at a point earlier than
// the start of the capture.
// BranchOrBacktrack(less, on_no_match);
BranchOrBacktrack(
Comparison(kLT, LoadLocal(capture_length_), Uint64Constant(0)),
on_no_match);
// If length is zero, either the capture is empty or it is completely
// uncaptured. In either case succeed immediately.
BranchOrBacktrack(
Comparison(kEQ, LoadLocal(capture_length_), Uint64Constant(0)),
&fallthrough);
Value* pos_push = nullptr;
Value* len_push = nullptr;
if (!read_backward) {
// Check that there are sufficient characters left in the input.
pos_push = PushLocal(current_position_);
len_push = PushLocal(capture_length_);
BranchOrBacktrack(
Comparison(kGT,
InstanceCall(InstanceCallDescriptor::FromToken(Token::kADD),
pos_push, len_push),
Uint64Constant(0)),
on_no_match);
}
pos_push = PushLocal(current_position_);
len_push = PushLocal(string_param_length_);
StoreLocal(match_start_index_, Bind(Add(pos_push, len_push)));
if (read_backward) {
// First check that there are enough characters before this point in
// the string that we can match the backreference.
BranchOrBacktrack(Comparison(kLT, LoadLocal(match_start_index_),
LoadLocal(capture_length_)),
on_no_match);
// The string to check is before the current position, not at it.
pos_push = PushLocal(match_start_index_);
len_push = PushLocal(capture_length_);
StoreLocal(match_start_index_, Bind(Sub(pos_push, len_push)));
}
pos_push = LoadRegister(start_reg);
len_push = PushLocal(string_param_length_);
StoreLocal(capture_start_index_, Bind(Add(pos_push, len_push)));
pos_push = PushLocal(match_start_index_);
len_push = PushLocal(capture_length_);
StoreLocal(match_end_index_, Bind(Add(pos_push, len_push)));
BlockLabel success;
if (mode_ == ASCII) {
BlockLabel loop_increment;
BlockLabel loop;
BindBlock(&loop);
StoreLocal(char_in_capture_, CharacterAt(capture_start_index_));
StoreLocal(char_in_match_, CharacterAt(match_start_index_));
BranchOrBacktrack(
Comparison(kEQ, LoadLocal(char_in_capture_), LoadLocal(char_in_match_)),
&loop_increment);
// Mismatch, try case-insensitive match (converting letters to lower-case).
Value* match_char_push = PushLocal(char_in_match_);
Value* mask_push = Bind(Uint64Constant(0x20));
StoreLocal(
char_in_match_,
Bind(InstanceCall(InstanceCallDescriptor::FromToken(Token::kBIT_OR),
match_char_push, mask_push)));
BlockLabel convert_capture;
BlockLabel on_not_in_range;
BranchOrBacktrack(
Comparison(kLT, LoadLocal(char_in_match_), Uint64Constant('a')),
&on_not_in_range);
BranchOrBacktrack(
Comparison(kGT, LoadLocal(char_in_match_), Uint64Constant('z')),
&on_not_in_range);
GoTo(&convert_capture);
BindBlock(&on_not_in_range);
// Latin-1: Check for values in range [224,254] but not 247.
BranchOrBacktrack(
Comparison(kLT, LoadLocal(char_in_match_), Uint64Constant(224)),
on_no_match);
BranchOrBacktrack(
Comparison(kGT, LoadLocal(char_in_match_), Uint64Constant(254)),
on_no_match);
BranchOrBacktrack(
Comparison(kEQ, LoadLocal(char_in_match_), Uint64Constant(247)),
on_no_match);
// Also convert capture character.
BindBlock(&convert_capture);
Value* capture_char_push = PushLocal(char_in_capture_);
mask_push = Bind(Uint64Constant(0x20));
StoreLocal(
char_in_capture_,
Bind(InstanceCall(InstanceCallDescriptor::FromToken(Token::kBIT_OR),
capture_char_push, mask_push)));
BranchOrBacktrack(
Comparison(kNE, LoadLocal(char_in_match_), LoadLocal(char_in_capture_)),
on_no_match);
BindBlock(&loop_increment);
// Increment indexes into capture and match strings.
Value* index_push = PushLocal(capture_start_index_);
Value* inc_push = Bind(Uint64Constant(1));
StoreLocal(capture_start_index_, Bind(Add(index_push, inc_push)));
index_push = PushLocal(match_start_index_);
inc_push = Bind(Uint64Constant(1));
StoreLocal(match_start_index_, Bind(Add(index_push, inc_push)));
// Compare to end of match, and loop if not done.
BranchOrBacktrack(Comparison(kLT, LoadLocal(match_start_index_),
LoadLocal(match_end_index_)),
&loop);
} else {
ASSERT(mode_ == UC16);
Value* string_value = Bind(LoadLocal(string_param_));
Value* lhs_index_value = Bind(LoadLocal(match_start_index_));
Value* rhs_index_value = Bind(LoadLocal(capture_start_index_));
Value* length_value = Bind(LoadLocal(capture_length_));
Definition* is_match_def;
is_match_def = new (Z) CaseInsensitiveCompareInstr(
string_value, lhs_index_value, rhs_index_value, length_value,
/*handle_surrogates=*/unicode, specialization_cid_);
BranchOrBacktrack(Comparison(kNE, is_match_def, BoolConstant(true)),
on_no_match);
}
BindBlock(&success);
if (read_backward) {
// Move current character position to start of match.
pos_push = PushLocal(current_position_);
len_push = PushLocal(capture_length_);
StoreLocal(current_position_, Bind(Sub(pos_push, len_push)));
} else {
// Move current character position to position after match.
Value* match_end_push = PushLocal(match_end_index_);
len_push = PushLocal(string_param_length_);
StoreLocal(current_position_, Bind(Sub(match_end_push, len_push)));
}
BindBlock(&fallthrough);
}
void IRRegExpMacroAssembler::CheckNotBackReference(intptr_t start_reg,
bool read_backward,
BlockLabel* on_no_match) {
TAG();
ASSERT(start_reg + 1 <= registers_count_);
BlockLabel fallthrough;
BlockLabel success;
// Find length of back-referenced capture.
Value* end_push = LoadRegister(start_reg + 1);
Value* start_push = LoadRegister(start_reg);
StoreLocal(capture_length_, Bind(Sub(end_push, start_push)));
// Fail on partial or illegal capture (start of capture after end of capture).
BranchOrBacktrack(
Comparison(kLT, LoadLocal(capture_length_), Uint64Constant(0)),
on_no_match);
// Succeed on empty capture (including no capture)
BranchOrBacktrack(
Comparison(kEQ, LoadLocal(capture_length_), Uint64Constant(0)),
&fallthrough);
Value* pos_push = nullptr;
Value* len_push = nullptr;
if (!read_backward) {
// Check that there are sufficient characters left in the input.
pos_push = PushLocal(current_position_);
len_push = PushLocal(capture_length_);
BranchOrBacktrack(
Comparison(kGT,
InstanceCall(InstanceCallDescriptor::FromToken(Token::kADD),
pos_push, len_push),
Uint64Constant(0)),
on_no_match);
}
// Compute pointers to match string and capture string.
pos_push = PushLocal(current_position_);
len_push = PushLocal(string_param_length_);
StoreLocal(match_start_index_, Bind(Add(pos_push, len_push)));
if (read_backward) {
// First check that there are enough characters before this point in
// the string that we can match the backreference.
BranchOrBacktrack(Comparison(kLT, LoadLocal(match_start_index_),
LoadLocal(capture_length_)),
on_no_match);
// The string to check is before the current position, not at it.
pos_push = PushLocal(match_start_index_);
len_push = PushLocal(capture_length_);
StoreLocal(match_start_index_, Bind(Sub(pos_push, len_push)));
}
pos_push = LoadRegister(start_reg);
len_push = PushLocal(string_param_length_);
StoreLocal(capture_start_index_, Bind(Add(pos_push, len_push)));
pos_push = PushLocal(match_start_index_);
len_push = PushLocal(capture_length_);
StoreLocal(match_end_index_, Bind(Add(pos_push, len_push)));
BlockLabel loop;
BindBlock(&loop);
StoreLocal(char_in_capture_, CharacterAt(capture_start_index_));
StoreLocal(char_in_match_, CharacterAt(match_start_index_));
BranchOrBacktrack(
Comparison(kNE, LoadLocal(char_in_capture_), LoadLocal(char_in_match_)),
on_no_match);
// Increment indexes into capture and match strings.
Value* index_push = PushLocal(capture_start_index_);
Value* inc_push = Bind(Uint64Constant(1));
StoreLocal(capture_start_index_, Bind(Add(index_push, inc_push)));
index_push = PushLocal(match_start_index_);
inc_push = Bind(Uint64Constant(1));
StoreLocal(match_start_index_, Bind(Add(index_push, inc_push)));
// Check if we have reached end of match area.
BranchOrBacktrack(Comparison(kLT, LoadLocal(match_start_index_),
LoadLocal(match_end_index_)),
&loop);
BindBlock(&success);
if (read_backward) {
// Move current character position to start of match.
pos_push = PushLocal(current_position_);
len_push = PushLocal(capture_length_);
StoreLocal(current_position_, Bind(Sub(pos_push, len_push)));
} else {
// Move current character position to position after match.
Value* match_end_push = PushLocal(match_end_index_);
len_push = PushLocal(string_param_length_);
StoreLocal(current_position_, Bind(Sub(match_end_push, len_push)));
}
BindBlock(&fallthrough);
}
void IRRegExpMacroAssembler::CheckNotCharacter(uint32_t c,
BlockLabel* on_not_equal) {
TAG();
BranchOrBacktrack(
Comparison(kNE, LoadLocal(current_character_), Uint64Constant(c)),
on_not_equal);
}
void IRRegExpMacroAssembler::CheckCharacterAfterAnd(uint32_t c,
uint32_t mask,
BlockLabel* on_equal) {
TAG();
Definition* actual_def = LoadLocal(current_character_);
Value* actual_push = Bind(actual_def);
Value* mask_push = Bind(Uint64Constant(mask));
actual_def = InstanceCall(InstanceCallDescriptor::FromToken(Token::kBIT_AND),
actual_push, mask_push);
Definition* expected_def = Uint64Constant(c);
BranchOrBacktrack(Comparison(kEQ, actual_def, expected_def), on_equal);
}
void IRRegExpMacroAssembler::CheckNotCharacterAfterAnd(
uint32_t c,
uint32_t mask,
BlockLabel* on_not_equal) {
TAG();
Definition* actual_def = LoadLocal(current_character_);
Value* actual_push = Bind(actual_def);
Value* mask_push = Bind(Uint64Constant(mask));
actual_def = InstanceCall(InstanceCallDescriptor::FromToken(Token::kBIT_AND),
actual_push, mask_push);
Definition* expected_def = Uint64Constant(c);
BranchOrBacktrack(Comparison(kNE, actual_def, expected_def), on_not_equal);
}
void IRRegExpMacroAssembler::CheckNotCharacterAfterMinusAnd(
uint16_t c,
uint16_t minus,
uint16_t mask,
BlockLabel* on_not_equal) {
TAG();
ASSERT(minus < Utf16::kMaxCodeUnit); // NOLINT
Definition* actual_def = LoadLocal(current_character_);
Value* actual_push = Bind(actual_def);
Value* minus_push = Bind(Uint64Constant(minus));
actual_push = Bind(Sub(actual_push, minus_push));
Value* mask_push = Bind(Uint64Constant(mask));
actual_def = InstanceCall(InstanceCallDescriptor::FromToken(Token::kBIT_AND),
actual_push, mask_push);
Definition* expected_def = Uint64Constant(c);
BranchOrBacktrack(Comparison(kNE, actual_def, expected_def), on_not_equal);
}
void IRRegExpMacroAssembler::CheckCharacterInRange(uint16_t from,
uint16_t to,
BlockLabel* on_in_range) {
TAG();
ASSERT(from <= to);
// TODO(zerny): All range comparisons could be done cheaper with unsigned
// compares. This pattern repeats in various places.
BlockLabel on_not_in_range;
BranchOrBacktrack(
Comparison(kLT, LoadLocal(current_character_), Uint64Constant(from)),
&on_not_in_range);
BranchOrBacktrack(
Comparison(kGT, LoadLocal(current_character_), Uint64Constant(to)),
&on_not_in_range);
BranchOrBacktrack(nullptr, on_in_range);
BindBlock(&on_not_in_range);
}
void IRRegExpMacroAssembler::CheckCharacterNotInRange(
uint16_t from,
uint16_t to,
BlockLabel* on_not_in_range) {
TAG();
ASSERT(from <= to);
BranchOrBacktrack(
Comparison(kLT, LoadLocal(current_character_), Uint64Constant(from)),
on_not_in_range);
BranchOrBacktrack(
Comparison(kGT, LoadLocal(current_character_), Uint64Constant(to)),
on_not_in_range);
}
void IRRegExpMacroAssembler::CheckBitInTable(const TypedData& table,
BlockLabel* on_bit_set) {
TAG();
Value* table_push = Bind(new (Z) ConstantInstr(table));
Value* index_push = PushLocal(current_character_);
if (mode_ != ASCII || kTableMask != Symbols::kMaxOneCharCodeSymbol) {
Value* mask_push = Bind(Uint64Constant(kTableSize - 1));
index_push =
Bind(InstanceCall(InstanceCallDescriptor::FromToken(Token::kBIT_AND),
index_push, mask_push));
}
Definition* byte_def = InstanceCall(
InstanceCallDescriptor::FromToken(Token::kINDEX), table_push, index_push);
Definition* zero_def = Int64Constant(0);
BranchOrBacktrack(Comparison(kNE, byte_def, zero_def), on_bit_set);
}
bool IRRegExpMacroAssembler::CheckSpecialCharacterClass(
uint16_t type,
BlockLabel* on_no_match) {
TAG();
// Range checks (c in min..max) are generally implemented by an unsigned
// (c - min) <= (max - min) check
switch (type) {
case 's':
// Match space-characters
if (mode_ == ASCII) {
// One byte space characters are '\t'..'\r', ' ' and \u00a0.
BlockLabel success;
// Space (' ').
BranchOrBacktrack(
Comparison(kEQ, LoadLocal(current_character_), Uint64Constant(' ')),
&success);
// Check range 0x09..0x0d.
CheckCharacterInRange('\t', '\r', &success);
// \u00a0 (NBSP).
BranchOrBacktrack(Comparison(kNE, LoadLocal(current_character_),
Uint64Constant(0x00a0)),
on_no_match);
BindBlock(&success);
return true;
}
return false;
case 'S':
// The emitted code for generic character classes is good enough.
return false;
case 'd':
// Match ASCII digits ('0'..'9')
CheckCharacterNotInRange('0', '9', on_no_match);
return true;
case 'D':
// Match non ASCII-digits
CheckCharacterInRange('0', '9', on_no_match);
return true;
case '.': {
// Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
BranchOrBacktrack(
Comparison(kEQ, LoadLocal(current_character_), Uint64Constant('\n')),
on_no_match);
BranchOrBacktrack(
Comparison(kEQ, LoadLocal(current_character_), Uint64Constant('\r')),
on_no_match);
if (mode_ == UC16) {
BranchOrBacktrack(Comparison(kEQ, LoadLocal(current_character_),
Uint64Constant(0x2028)),
on_no_match);
BranchOrBacktrack(Comparison(kEQ, LoadLocal(current_character_),
Uint64Constant(0x2029)),
on_no_match);
}
return true;
}
case 'w': {
if (mode_ != ASCII) {
// Table is 128 entries, so all ASCII characters can be tested.
BranchOrBacktrack(
Comparison(kGT, LoadLocal(current_character_), Uint64Constant('z')),
on_no_match);
}
Value* table_push = Bind(WordCharacterMapConstant());
Value* index_push = PushLocal(current_character_);
Definition* byte_def =
InstanceCall(InstanceCallDescriptor::FromToken(Token::kINDEX),
table_push, index_push);
Definition* zero_def = Int64Constant(0);
BranchOrBacktrack(Comparison(kEQ, byte_def, zero_def), on_no_match);
return true;
}
case 'W': {
BlockLabel done;
if (mode_ != ASCII) {
// Table is 128 entries, so all ASCII characters can be tested.
BranchOrBacktrack(
Comparison(kGT, LoadLocal(current_character_), Uint64Constant('z')),
&done);
}
// TODO(zerny): Refactor to use CheckBitInTable if possible.
Value* table_push = Bind(WordCharacterMapConstant());
Value* index_push = PushLocal(current_character_);
Definition* byte_def =
InstanceCall(InstanceCallDescriptor::FromToken(Token::kINDEX),
table_push, index_push);
Definition* zero_def = Int64Constant(0);
BranchOrBacktrack(Comparison(kNE, byte_def, zero_def), on_no_match);
if (mode_ != ASCII) {
BindBlock(&done);
}
return true;
}
// Non-standard classes (with no syntactic shorthand) used internally.
case '*':
// Match any character.
return true;
case 'n': {
// Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 or 0x2029).
// The opposite of '.'.
BlockLabel success;
BranchOrBacktrack(
Comparison(kEQ, LoadLocal(current_character_), Uint64Constant('\n')),
&success);
BranchOrBacktrack(
Comparison(kEQ, LoadLocal(current_character_), Uint64Constant('\r')),
&success);
if (mode_ == UC16) {
BranchOrBacktrack(Comparison(kEQ, LoadLocal(current_character_),
Uint64Constant(0x2028)),
&success);
BranchOrBacktrack(Comparison(kEQ, LoadLocal(current_character_),
Uint64Constant(0x2029)),
&success);
}
BranchOrBacktrack(nullptr, on_no_match);
BindBlock(&success);
return true;
}
// No custom implementation (yet): s(uint16_t), S(uint16_t).
default:
return false;
}
}
void IRRegExpMacroAssembler::Fail() {
TAG();
ASSERT(FAILURE == 0); // Return value for failure is zero.
if (!global()) {
UNREACHABLE(); // Dart regexps are always global.
}
GoTo(exit_block_);
}
void IRRegExpMacroAssembler::IfRegisterGE(intptr_t reg,
intptr_t comparand,
BlockLabel* if_ge) {
TAG();
Value* reg_push = LoadRegister(reg);
Value* pos = Bind(Int64Constant(comparand));
BranchOrBacktrack(Comparison(kGTE, reg_push, pos), if_ge);
}
void IRRegExpMacroAssembler::IfRegisterLT(intptr_t reg,
intptr_t comparand,
BlockLabel* if_lt) {
TAG();
Value* reg_push = LoadRegister(reg);
Value* pos = Bind(Int64Constant(comparand));
BranchOrBacktrack(Comparison(kLT, reg_push, pos), if_lt);
}
void IRRegExpMacroAssembler::IfRegisterEqPos(intptr_t reg, BlockLabel* if_eq) {
TAG();
Value* reg_push = LoadRegister(reg);
Value* pos = Bind(LoadLocal(current_position_));
BranchOrBacktrack(Comparison(kEQ, reg_push, pos), if_eq);
}
RegExpMacroAssembler::IrregexpImplementation
IRRegExpMacroAssembler::Implementation() {
return kIRImplementation;
}
void IRRegExpMacroAssembler::LoadCurrentCharacter(intptr_t cp_offset,
BlockLabel* on_end_of_input,
bool check_bounds,
intptr_t characters) {
TAG();
ASSERT(cp_offset < (1 << 30)); // Be sane! (And ensure negation works)
if (check_bounds) {
if (cp_offset >= 0) {
CheckPosition(cp_offset + characters - 1, on_end_of_input);
} else {
CheckPosition(cp_offset, on_end_of_input);
}
}
LoadCurrentCharacterUnchecked(cp_offset, characters);
}
void IRRegExpMacroAssembler::PopCurrentPosition() {
TAG();
StoreLocal(current_position_, Bind(PopStack()));
}
void IRRegExpMacroAssembler::PopRegister(intptr_t reg) {
TAG();
ASSERT(reg < registers_count_);
Value* registers_push = PushLocal(registers_);
Value* index_push = PushRegisterIndex(reg);
Value* pop_push = Bind(PopStack());
StoreRegister(registers_push, index_push, pop_push);
}
void IRRegExpMacroAssembler::PushStack(Definition* definition) {
Value* stack_push = PushLocal(stack_);
Value* stack_pointer_push = PushLocal(stack_pointer_);
StoreLocal(stack_pointer_,
Bind(Add(stack_pointer_push, Bind(Uint64Constant(1)))));
stack_pointer_push = PushLocal(stack_pointer_);
// TODO(zerny): bind value and push could break stack discipline.
Value* value_push = Bind(definition);
Do(InstanceCall(InstanceCallDescriptor::FromToken(Token::kASSIGN_INDEX),
stack_push, stack_pointer_push, value_push));
}
Definition* IRRegExpMacroAssembler::PopStack() {
Value* stack_push = PushLocal(stack_);
Value* stack_pointer_push1 = PushLocal(stack_pointer_);
Value* stack_pointer_push2 = PushLocal(stack_pointer_);
StoreLocal(stack_pointer_,
Bind(Sub(stack_pointer_push2, Bind(Uint64Constant(1)))));
return InstanceCall(InstanceCallDescriptor::FromToken(Token::kINDEX),
stack_push, stack_pointer_push1);
}
Definition* IRRegExpMacroAssembler::PeekStack() {
Value* stack_push = PushLocal(stack_);
Value* stack_pointer_push = PushLocal(stack_pointer_);
return InstanceCall(InstanceCallDescriptor::FromToken(Token::kINDEX),
stack_push, stack_pointer_push);
}
// Pushes the location corresponding to label to the backtracking stack.
void IRRegExpMacroAssembler::PushBacktrack(BlockLabel* label) {
TAG();
// Ensure that targets of indirect jumps are never accessed through a
// normal control flow instructions by creating a new block for each backtrack
// target.
IndirectEntryInstr* indirect_target = IndirectWithJoinGoto(label->block());
// Add a fake edge from the graph entry for data flow analysis.
entry_block_->AddIndirectEntry(indirect_target);
ConstantInstr* offset = Uint64Constant(indirect_target->indirect_id());
PushStack(offset);
CheckStackLimit();
}
void IRRegExpMacroAssembler::PushCurrentPosition() {
TAG();
PushStack(LoadLocal(current_position_));
}
void IRRegExpMacroAssembler::PushRegister(intptr_t reg) {
TAG();
// TODO(zerny): Refactor PushStack so it can be reused here.
Value* stack_push = PushLocal(stack_);
Value* stack_pointer_push = PushLocal(stack_pointer_);
StoreLocal(stack_pointer_,
Bind(Add(stack_pointer_push, Bind(Uint64Constant(1)))));
stack_pointer_push = PushLocal(stack_pointer_);
// TODO(zerny): bind value and push could break stack discipline.
Value* value_push = LoadRegister(reg);
Do(InstanceCall(InstanceCallDescriptor::FromToken(Token::kASSIGN_INDEX),
stack_push, stack_pointer_push, value_push));
CheckStackLimit();
}
// Checks that (stack.capacity - stack_limit_slack) > stack_pointer.
// This ensures that up to stack_limit_slack stack pushes can be
// done without exhausting the stack space. If the check fails the
// stack will be grown.
void IRRegExpMacroAssembler::CheckStackLimit() {
TAG();
Value* stack_push = PushLocal(stack_);
Value* length_push =
Bind(InstanceCall(InstanceCallDescriptor(String::ZoneHandle(
Field::GetterSymbol(Symbols::Length()))),
stack_push));
Value* capacity_push =
Bind(Sub(length_push, Bind(Uint64Constant(stack_limit_slack()))));
Value* stack_pointer_push = PushLocal(stack_pointer_);
BranchInstr* branch = new (Z) BranchInstr(
Comparison(kGT, capacity_push, stack_pointer_push), GetNextDeoptId());
CloseBlockWith(branch);
BlockLabel grow_stack;
BlockLabel fallthrough;
*branch->true_successor_address() = TargetWithJoinGoto(fallthrough.block());
*branch->false_successor_address() = TargetWithJoinGoto(grow_stack.block());
BindBlock(&grow_stack);
GrowStack();
BindBlock(&fallthrough);
}
void IRRegExpMacroAssembler::GrowStack() {
TAG();
const Library& lib = Library::Handle(Library::CoreLibrary());
const Class& regexp_class =
Class::Handle(lib.LookupClassAllowPrivate(Symbols::_RegExp()));
const Function& grow_backtracking_stack_function =
Function::ZoneHandle(Z, regexp_class.LookupFunctionAllowPrivate(
Symbols::_growBacktrackingStack()));
StoreLocal(stack_, Bind(StaticCall(grow_backtracking_stack_function,
ICData::kStatic)));
}
void IRRegExpMacroAssembler::ReadCurrentPositionFromRegister(intptr_t reg) {
TAG();
StoreLocal(current_position_, LoadRegister(reg));
}
// Resets the tip of the stack to the value stored in reg.
void IRRegExpMacroAssembler::ReadStackPointerFromRegister(intptr_t reg) {
TAG();
ASSERT(reg < registers_count_);
StoreLocal(stack_pointer_, LoadRegister(reg));
}
void IRRegExpMacroAssembler::SetCurrentPositionFromEnd(intptr_t by) {
TAG();
BlockLabel after_position;
Definition* cur_pos_def = LoadLocal(current_position_);
Definition* by_value_def = Int64Constant(-by);
BranchOrBacktrack(Comparison(kGTE, cur_pos_def, by_value_def),
&after_position);
StoreLocal(current_position_, Bind(Int64Constant(-by)));
// On RegExp code entry (where this operation is used), the character before
// the current position is expected to be already loaded.
// We have advanced the position, so it's safe to read backwards.
LoadCurrentCharacterUnchecked(-1, 1);
BindBlock(&after_position);
}
void IRRegExpMacroAssembler::SetRegister(intptr_t reg, intptr_t to) {
TAG();
// Reserved for positions!
ASSERT(reg >= saved_registers_count_);
StoreRegister(reg, to);
}
bool IRRegExpMacroAssembler::Succeed() {
TAG();
GoTo(success_block_);
return global();
}
void IRRegExpMacroAssembler::WriteCurrentPositionToRegister(
intptr_t reg,
intptr_t cp_offset) {
TAG();
Value* registers_push = PushLocal(registers_);
Value* index_push = PushRegisterIndex(reg);
Value* pos_push = PushLocal(current_position_);
Value* off_push = Bind(Int64Constant(cp_offset));
Value* neg_off_push = Bind(Add(pos_push, off_push));
// Push the negative offset; these are converted to positive string positions
// within the success block.
StoreRegister(registers_push, index_push, neg_off_push);
}
void IRRegExpMacroAssembler::ClearRegisters(intptr_t reg_from,
intptr_t reg_to) {
TAG();
ASSERT(reg_from <= reg_to);
// In order to clear registers to a final result value of -1, set them to
// (-1 - string length), the offset of -1 from the end of the string.
for (intptr_t reg = reg_from; reg <= reg_to; reg++) {
Value* registers_push = PushLocal(registers_);
Value* index_push = PushRegisterIndex(reg);
Value* minus_one_push = Bind(Int64Constant(-1));
Value* length_push = PushLocal(string_param_length_);
Value* value_push = Bind(Sub(minus_one_push, length_push));
StoreRegister(registers_push, index_push, value_push);
}
}
void IRRegExpMacroAssembler::WriteStackPointerToRegister(intptr_t reg) {
TAG();
Value* registers_push = PushLocal(registers_);
Value* index_push = PushRegisterIndex(reg);
Value* tip_push = PushLocal(stack_pointer_);
StoreRegister(registers_push, index_push, tip_push);
}
// Private methods:
void IRRegExpMacroAssembler::CheckPosition(intptr_t cp_offset,
BlockLabel* on_outside_input) {
TAG();
if (cp_offset >= 0) {
Definition* curpos_def = LoadLocal(current_position_);
Definition* cp_off_def = Int64Constant(-cp_offset);
// If (current_position_ < -cp_offset), we are in bounds.
// Remember, current_position_ is a negative offset from the string end.
BranchOrBacktrack(Comparison(kGTE, curpos_def, cp_off_def),
on_outside_input);
} else {
// We need to see if there's enough characters left in the string to go
// back cp_offset characters, so get the normalized position and then
// make sure that (normalized_position >= -cp_offset).
Value* pos_push = PushLocal(current_position_);
Value* len_push = PushLocal(string_param_length_);
BranchOrBacktrack(
Comparison(kLT, Add(pos_push, len_push), Uint64Constant(-cp_offset)),
on_outside_input);
}
}
void IRRegExpMacroAssembler::BranchOrBacktrack(ComparisonInstr* comparison,
BlockLabel* true_successor) {
if (comparison == nullptr) { // No condition
if (true_successor == nullptr) {
Backtrack();
return;
}
GoTo(true_successor);
return;
}
// If no successor block has been passed in, backtrack.
JoinEntryInstr* true_successor_block = backtrack_block_;
if (true_successor != nullptr) {
true_successor->SetLinked();
true_successor_block = true_successor->block();
}
ASSERT(true_successor_block != nullptr);
// If the condition is not true, fall through to a new block.
BlockLabel fallthrough;
BranchInstr* branch = new (Z) BranchInstr(comparison, GetNextDeoptId());
*branch->true_successor_address() = TargetWithJoinGoto(true_successor_block);
*branch->false_successor_address() = TargetWithJoinGoto(fallthrough.block());
CloseBlockWith(branch);
BindBlock(&fallthrough);
}
TargetEntryInstr* IRRegExpMacroAssembler::TargetWithJoinGoto(
JoinEntryInstr* dst) {
TargetEntryInstr* target = new (Z)
TargetEntryInstr(block_id_.Alloc(), kInvalidTryIndex, GetNextDeoptId());
blocks_.Add(target);
target->AppendInstruction(new (Z) GotoInstr(dst, GetNextDeoptId()));
return target;
}
IndirectEntryInstr* IRRegExpMacroAssembler::IndirectWithJoinGoto(
JoinEntryInstr* dst) {
IndirectEntryInstr* target =
new (Z) IndirectEntryInstr(block_id_.Alloc(), indirect_id_.Alloc(),
kInvalidTryIndex, GetNextDeoptId());
blocks_.Add(target);
target->AppendInstruction(new (Z) GotoInstr(dst, GetNextDeoptId()));
return target;
}
void IRRegExpMacroAssembler::CheckPreemption(bool is_backtrack) {
TAG();
// We don't have the loop_depth available when compiling regexps, but
// we set loop_depth to a non-zero value because this instruction does
// not act as an OSR entry outside loops.
AppendInstruction(new (Z) CheckStackOverflowInstr(
InstructionSource(),
/*stack_depth=*/0,
/*loop_depth=*/1, GetNextDeoptId(),
is_backtrack ? CheckStackOverflowInstr::kOsrAndPreemption
: CheckStackOverflowInstr::kOsrOnly));
}
Definition* IRRegExpMacroAssembler::Add(Value* lhs, Value* rhs) {
return InstanceCall(InstanceCallDescriptor::FromToken(Token::kADD), lhs, rhs);
}
Definition* IRRegExpMacroAssembler::Sub(Value* lhs, Value* rhs) {
return InstanceCall(InstanceCallDescriptor::FromToken(Token::kSUB), lhs, rhs);
}
void IRRegExpMacroAssembler::LoadCurrentCharacterUnchecked(
intptr_t cp_offset,
intptr_t characters) {
TAG();
ASSERT(characters == 1 || CanReadUnaligned());
if (mode_ == ASCII) {
ASSERT(characters == 1 || characters == 2 || characters == 4);
} else {
ASSERT(mode_ == UC16);
ASSERT(characters == 1 || characters == 2);
}
// Calculate the addressed string index as:
// cp_offset + current_position_ + string_param_length_
// TODO(zerny): Avoid generating 'add' instance-calls here.
Value* off_arg = Bind(Int64Constant(cp_offset));
Value* pos_arg = BindLoadLocal(*current_position_);
Value* off_pos_arg = Bind(Add(off_arg, pos_arg));
Value* len_arg = BindLoadLocal(*string_param_length_);
// Index is stored in a temporary local so that we can later load it safely.
StoreLocal(index_temp_, Bind(Add(off_pos_arg, len_arg)));
// Load and store the code units.
Value* code_unit_value = LoadCodeUnitsAt(index_temp_, characters);
StoreLocal(current_character_, code_unit_value);
PRINT(PushLocal(current_character_));
}
Value* IRRegExpMacroAssembler::CharacterAt(LocalVariable* index) {
return LoadCodeUnitsAt(index, 1);
}
Value* IRRegExpMacroAssembler::LoadCodeUnitsAt(LocalVariable* index,
intptr_t characters) {
// Bind the pattern as the load receiver.
Value* pattern_val = BindLoadLocal(*string_param_);
if (IsExternalStringClassId(specialization_cid_)) {
// The data of an external string is stored through one indirection.
intptr_t external_offset = 0;
if (specialization_cid_ == kExternalOneByteStringCid) {
external_offset = ExternalOneByteString::external_data_offset();
} else if (specialization_cid_ == kExternalTwoByteStringCid) {
external_offset = ExternalTwoByteString::external_data_offset();
} else {
UNREACHABLE();
}
// This pushes an untagged value on the stack which is immediately consumed
// by LoadCodeUnitsAtInstr below.
pattern_val = Bind(new (Z) LoadUntaggedInstr(pattern_val, external_offset));
}
// Here pattern_val might be untagged so this must not trigger a GC.
Value* index_val = BindLoadLocal(*index);
return Bind(new (Z)
LoadCodeUnitsInstr(pattern_val, index_val, characters,
specialization_cid_, InstructionSource()));
}
#undef __
} // namespace dart
#endif // !defined(DART_PRECOMPILED_RUNTIME)