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v8/src/ast.cc
verwaest@chromium.org 2b574ef580 Promoting elements transitions to their own field. 
This is a first step towards separating all transitions from the property descriptions. If we link the property descriptions from the transition object, this will in allow the descriptor array (property descriptions) to become immutable.

Review URL: https://chromiumcodereview.appspot.com/10444055

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11750 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2012-06-11 06:59:56 +00:00

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// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "ast.h"
#include <math.h> // For isfinite.
#include "builtins.h"
#include "conversions.h"
#include "hashmap.h"
#include "parser.h"
#include "property-details.h"
#include "property.h"
#include "scopes.h"
#include "string-stream.h"
#include "type-info.h"
namespace v8 {
namespace internal {
// ----------------------------------------------------------------------------
// All the Accept member functions for each syntax tree node type.
#define DECL_ACCEPT(type) \
void type::Accept(AstVisitor* v) { v->Visit##type(this); }
AST_NODE_LIST(DECL_ACCEPT)
#undef DECL_ACCEPT
// ----------------------------------------------------------------------------
// Implementation of other node functionality.
bool Expression::IsSmiLiteral() {
return AsLiteral() != NULL && AsLiteral()->handle()->IsSmi();
}
bool Expression::IsStringLiteral() {
return AsLiteral() != NULL && AsLiteral()->handle()->IsString();
}
bool Expression::IsNullLiteral() {
return AsLiteral() != NULL && AsLiteral()->handle()->IsNull();
}
VariableProxy::VariableProxy(Isolate* isolate, Variable* var)
: Expression(isolate),
name_(var->name()),
var_(NULL), // Will be set by the call to BindTo.
is_this_(var->is_this()),
is_trivial_(false),
is_lvalue_(false),
position_(RelocInfo::kNoPosition),
interface_(var->interface()) {
BindTo(var);
}
VariableProxy::VariableProxy(Isolate* isolate,
Handle<String> name,
bool is_this,
int position,
Interface* interface)
: Expression(isolate),
name_(name),
var_(NULL),
is_this_(is_this),
is_trivial_(false),
is_lvalue_(false),
position_(position),
interface_(interface) {
// Names must be canonicalized for fast equality checks.
ASSERT(name->IsSymbol());
}
void VariableProxy::BindTo(Variable* var) {
ASSERT(var_ == NULL); // must be bound only once
ASSERT(var != NULL); // must bind
ASSERT((is_this() && var->is_this()) || name_.is_identical_to(var->name()));
// Ideally CONST-ness should match. However, this is very hard to achieve
// because we don't know the exact semantics of conflicting (const and
// non-const) multiple variable declarations, const vars introduced via
// eval() etc. Const-ness and variable declarations are a complete mess
// in JS. Sigh...
var_ = var;
var->set_is_used(true);
}
Assignment::Assignment(Isolate* isolate,
Token::Value op,
Expression* target,
Expression* value,
int pos)
: Expression(isolate),
op_(op),
target_(target),
value_(value),
pos_(pos),
binary_operation_(NULL),
compound_load_id_(kNoNumber),
assignment_id_(GetNextId(isolate)),
block_start_(false),
block_end_(false),
is_monomorphic_(false) { }
Token::Value Assignment::binary_op() const {
switch (op_) {
case Token::ASSIGN_BIT_OR: return Token::BIT_OR;
case Token::ASSIGN_BIT_XOR: return Token::BIT_XOR;
case Token::ASSIGN_BIT_AND: return Token::BIT_AND;
case Token::ASSIGN_SHL: return Token::SHL;
case Token::ASSIGN_SAR: return Token::SAR;
case Token::ASSIGN_SHR: return Token::SHR;
case Token::ASSIGN_ADD: return Token::ADD;
case Token::ASSIGN_SUB: return Token::SUB;
case Token::ASSIGN_MUL: return Token::MUL;
case Token::ASSIGN_DIV: return Token::DIV;
case Token::ASSIGN_MOD: return Token::MOD;
default: UNREACHABLE();
}
return Token::ILLEGAL;
}
bool FunctionLiteral::AllowsLazyCompilation() {
return scope()->AllowsLazyCompilation();
}
int FunctionLiteral::start_position() const {
return scope()->start_position();
}
int FunctionLiteral::end_position() const {
return scope()->end_position();
}
LanguageMode FunctionLiteral::language_mode() const {
return scope()->language_mode();
}
ObjectLiteral::Property::Property(Literal* key,
Expression* value,
Isolate* isolate) {
emit_store_ = true;
key_ = key;
value_ = value;
Object* k = *key->handle();
if (k->IsSymbol() &&
isolate->heap()->Proto_symbol()->Equals(String::cast(k))) {
kind_ = PROTOTYPE;
} else if (value_->AsMaterializedLiteral() != NULL) {
kind_ = MATERIALIZED_LITERAL;
} else if (value_->AsLiteral() != NULL) {
kind_ = CONSTANT;
} else {
kind_ = COMPUTED;
}
}
ObjectLiteral::Property::Property(bool is_getter, FunctionLiteral* value) {
emit_store_ = true;
value_ = value;
kind_ = is_getter ? GETTER : SETTER;
}
bool ObjectLiteral::Property::IsCompileTimeValue() {
return kind_ == CONSTANT ||
(kind_ == MATERIALIZED_LITERAL &&
CompileTimeValue::IsCompileTimeValue(value_));
}
void ObjectLiteral::Property::set_emit_store(bool emit_store) {
emit_store_ = emit_store;
}
bool ObjectLiteral::Property::emit_store() {
return emit_store_;
}
bool IsEqualString(void* first, void* second) {
ASSERT((*reinterpret_cast<String**>(first))->IsString());
ASSERT((*reinterpret_cast<String**>(second))->IsString());
Handle<String> h1(reinterpret_cast<String**>(first));
Handle<String> h2(reinterpret_cast<String**>(second));
return (*h1)->Equals(*h2);
}
bool IsEqualNumber(void* first, void* second) {
ASSERT((*reinterpret_cast<Object**>(first))->IsNumber());
ASSERT((*reinterpret_cast<Object**>(second))->IsNumber());
Handle<Object> h1(reinterpret_cast<Object**>(first));
Handle<Object> h2(reinterpret_cast<Object**>(second));
if (h1->IsSmi()) {
return h2->IsSmi() && *h1 == *h2;
}
if (h2->IsSmi()) return false;
Handle<HeapNumber> n1 = Handle<HeapNumber>::cast(h1);
Handle<HeapNumber> n2 = Handle<HeapNumber>::cast(h2);
ASSERT(isfinite(n1->value()));
ASSERT(isfinite(n2->value()));
return n1->value() == n2->value();
}
void ObjectLiteral::CalculateEmitStore() {
ZoneHashMap table(Literal::Match);
for (int i = properties()->length() - 1; i >= 0; i--) {
ObjectLiteral::Property* property = properties()->at(i);
Literal* literal = property->key();
if (literal->handle()->IsNull()) continue;
uint32_t hash = literal->Hash();
// If the key of a computed property is in the table, do not emit
// a store for the property later.
if (property->kind() == ObjectLiteral::Property::COMPUTED &&
table.Lookup(literal, hash, false) != NULL) {
property->set_emit_store(false);
} else {
// Add key to the table.
table.Lookup(literal, hash, true);
}
}
}
void TargetCollector::AddTarget(Label* target) {
// Add the label to the collector, but discard duplicates.
int length = targets_.length();
for (int i = 0; i < length; i++) {
if (targets_[i] == target) return;
}
targets_.Add(target);
}
bool UnaryOperation::ResultOverwriteAllowed() {
switch (op_) {
case Token::BIT_NOT:
case Token::SUB:
return true;
default:
return false;
}
}
bool BinaryOperation::ResultOverwriteAllowed() {
switch (op_) {
case Token::COMMA:
case Token::OR:
case Token::AND:
return false;
case Token::BIT_OR:
case Token::BIT_XOR:
case Token::BIT_AND:
case Token::SHL:
case Token::SAR:
case Token::SHR:
case Token::ADD:
case Token::SUB:
case Token::MUL:
case Token::DIV:
case Token::MOD:
return true;
default:
UNREACHABLE();
}
return false;
}
static bool IsTypeof(Expression* expr) {
UnaryOperation* maybe_unary = expr->AsUnaryOperation();
return maybe_unary != NULL && maybe_unary->op() == Token::TYPEOF;
}
// Check for the pattern: typeof <expression> equals <string literal>.
static bool MatchLiteralCompareTypeof(Expression* left,
Token::Value op,
Expression* right,
Expression** expr,
Handle<String>* check) {
if (IsTypeof(left) && right->IsStringLiteral() && Token::IsEqualityOp(op)) {
*expr = left->AsUnaryOperation()->expression();
*check = Handle<String>::cast(right->AsLiteral()->handle());
return true;
}
return false;
}
bool CompareOperation::IsLiteralCompareTypeof(Expression** expr,
Handle<String>* check) {
return MatchLiteralCompareTypeof(left_, op_, right_, expr, check) ||
MatchLiteralCompareTypeof(right_, op_, left_, expr, check);
}
static bool IsVoidOfLiteral(Expression* expr) {
UnaryOperation* maybe_unary = expr->AsUnaryOperation();
return maybe_unary != NULL &&
maybe_unary->op() == Token::VOID &&
maybe_unary->expression()->AsLiteral() != NULL;
}
// Check for the pattern: void <literal> equals <expression>
static bool MatchLiteralCompareUndefined(Expression* left,
Token::Value op,
Expression* right,
Expression** expr) {
if (IsVoidOfLiteral(left) && Token::IsEqualityOp(op)) {
*expr = right;
return true;
}
return false;
}
bool CompareOperation::IsLiteralCompareUndefined(Expression** expr) {
return MatchLiteralCompareUndefined(left_, op_, right_, expr) ||
MatchLiteralCompareUndefined(right_, op_, left_, expr);
}
// Check for the pattern: null equals <expression>
static bool MatchLiteralCompareNull(Expression* left,
Token::Value op,
Expression* right,
Expression** expr) {
if (left->IsNullLiteral() && Token::IsEqualityOp(op)) {
*expr = right;
return true;
}
return false;
}
bool CompareOperation::IsLiteralCompareNull(Expression** expr) {
return MatchLiteralCompareNull(left_, op_, right_, expr) ||
MatchLiteralCompareNull(right_, op_, left_, expr);
}
// ----------------------------------------------------------------------------
// Inlining support
bool Declaration::IsInlineable() const {
return proxy()->var()->IsStackAllocated();
}
bool FunctionDeclaration::IsInlineable() const {
return false;
}
// ----------------------------------------------------------------------------
// Recording of type feedback
void Property::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
// Record type feedback from the oracle in the AST.
is_uninitialized_ = oracle->LoadIsUninitialized(this);
if (is_uninitialized_) return;
is_monomorphic_ = oracle->LoadIsMonomorphicNormal(this);
receiver_types_.Clear();
if (key()->IsPropertyName()) {
if (oracle->LoadIsBuiltin(this, Builtins::kLoadIC_ArrayLength)) {
is_array_length_ = true;
} else if (oracle->LoadIsBuiltin(this, Builtins::kLoadIC_StringLength)) {
is_string_length_ = true;
} else if (oracle->LoadIsBuiltin(this,
Builtins::kLoadIC_FunctionPrototype)) {
is_function_prototype_ = true;
} else {
Literal* lit_key = key()->AsLiteral();
ASSERT(lit_key != NULL && lit_key->handle()->IsString());
Handle<String> name = Handle<String>::cast(lit_key->handle());
oracle->LoadReceiverTypes(this, name, &receiver_types_);
}
} else if (oracle->LoadIsBuiltin(this, Builtins::kKeyedLoadIC_String)) {
is_string_access_ = true;
} else if (is_monomorphic_) {
receiver_types_.Add(oracle->LoadMonomorphicReceiverType(this));
} else if (oracle->LoadIsMegamorphicWithTypeInfo(this)) {
receiver_types_.Reserve(kMaxKeyedPolymorphism);
oracle->CollectKeyedReceiverTypes(this->id(), &receiver_types_);
}
}
void Assignment::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
Property* prop = target()->AsProperty();
ASSERT(prop != NULL);
is_monomorphic_ = oracle->StoreIsMonomorphicNormal(this);
receiver_types_.Clear();
if (prop->key()->IsPropertyName()) {
Literal* lit_key = prop->key()->AsLiteral();
ASSERT(lit_key != NULL && lit_key->handle()->IsString());
Handle<String> name = Handle<String>::cast(lit_key->handle());
oracle->StoreReceiverTypes(this, name, &receiver_types_);
} else if (is_monomorphic_) {
// Record receiver type for monomorphic keyed stores.
receiver_types_.Add(oracle->StoreMonomorphicReceiverType(this));
} else if (oracle->StoreIsMegamorphicWithTypeInfo(this)) {
receiver_types_.Reserve(kMaxKeyedPolymorphism);
oracle->CollectKeyedReceiverTypes(this->id(), &receiver_types_);
}
}
void CountOperation::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
is_monomorphic_ = oracle->StoreIsMonomorphicNormal(this);
receiver_types_.Clear();
if (is_monomorphic_) {
// Record receiver type for monomorphic keyed stores.
receiver_types_.Add(oracle->StoreMonomorphicReceiverType(this));
} else if (oracle->StoreIsMegamorphicWithTypeInfo(this)) {
receiver_types_.Reserve(kMaxKeyedPolymorphism);
oracle->CollectKeyedReceiverTypes(this->id(), &receiver_types_);
}
}
void CaseClause::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
TypeInfo info = oracle->SwitchType(this);
if (info.IsSmi()) {
compare_type_ = SMI_ONLY;
} else if (info.IsSymbol()) {
compare_type_ = SYMBOL_ONLY;
} else if (info.IsNonSymbol()) {
compare_type_ = STRING_ONLY;
} else if (info.IsNonPrimitive()) {
compare_type_ = OBJECT_ONLY;
} else {
ASSERT(compare_type_ == NONE);
}
}
bool Call::ComputeTarget(Handle<Map> type, Handle<String> name) {
// If there is an interceptor, we can't compute the target for a direct call.
if (type->has_named_interceptor()) return false;
if (check_type_ == RECEIVER_MAP_CHECK) {
// For primitive checks the holder is set up to point to the corresponding
// prototype object, i.e. one step of the algorithm below has been already
// performed. For non-primitive checks we clear it to allow computing
// targets for polymorphic calls.
holder_ = Handle<JSObject>::null();
}
LookupResult lookup(type->GetIsolate());
while (true) {
type->LookupInDescriptors(NULL, *name, &lookup);
if (lookup.IsFound()) {
switch (lookup.type()) {
case CONSTANT_FUNCTION:
// We surely know the target for a constant function.
target_ =
Handle<JSFunction>(lookup.GetConstantFunctionFromMap(*type));
return true;
case NORMAL:
case FIELD:
case CALLBACKS:
case HANDLER:
case INTERCEPTOR:
// We don't know the target.
return false;
case MAP_TRANSITION:
case CONSTANT_TRANSITION:
case NULL_DESCRIPTOR:
// Perhaps something interesting is up in the prototype chain...
break;
}
}
// If we reach the end of the prototype chain, we don't know the target.
if (!type->prototype()->IsJSObject()) return false;
// Go up the prototype chain, recording where we are currently.
holder_ = Handle<JSObject>(JSObject::cast(type->prototype()));
type = Handle<Map>(holder()->map());
}
}
bool Call::ComputeGlobalTarget(Handle<GlobalObject> global,
LookupResult* lookup) {
target_ = Handle<JSFunction>::null();
cell_ = Handle<JSGlobalPropertyCell>::null();
ASSERT(lookup->IsFound() &&
lookup->type() == NORMAL &&
lookup->holder() == *global);
cell_ = Handle<JSGlobalPropertyCell>(global->GetPropertyCell(lookup));
if (cell_->value()->IsJSFunction()) {
Handle<JSFunction> candidate(JSFunction::cast(cell_->value()));
// If the function is in new space we assume it's more likely to
// change and thus prefer the general IC code.
if (!HEAP->InNewSpace(*candidate)) {
target_ = candidate;
return true;
}
}
return false;
}
void Call::RecordTypeFeedback(TypeFeedbackOracle* oracle,
CallKind call_kind) {
is_monomorphic_ = oracle->CallIsMonomorphic(this);
Property* property = expression()->AsProperty();
if (property == NULL) {
// Function call. Specialize for monomorphic calls.
if (is_monomorphic_) target_ = oracle->GetCallTarget(this);
} else {
// Method call. Specialize for the receiver types seen at runtime.
Literal* key = property->key()->AsLiteral();
ASSERT(key != NULL && key->handle()->IsString());
Handle<String> name = Handle<String>::cast(key->handle());
receiver_types_.Clear();
oracle->CallReceiverTypes(this, name, call_kind, &receiver_types_);
#ifdef DEBUG
if (FLAG_enable_slow_asserts) {
int length = receiver_types_.length();
for (int i = 0; i < length; i++) {
Handle<Map> map = receiver_types_.at(i);
ASSERT(!map.is_null() && *map != NULL);
}
}
#endif
check_type_ = oracle->GetCallCheckType(this);
if (is_monomorphic_) {
Handle<Map> map;
if (receiver_types_.length() > 0) {
ASSERT(check_type_ == RECEIVER_MAP_CHECK);
map = receiver_types_.at(0);
} else {
ASSERT(check_type_ != RECEIVER_MAP_CHECK);
holder_ = Handle<JSObject>(
oracle->GetPrototypeForPrimitiveCheck(check_type_));
map = Handle<Map>(holder_->map());
}
is_monomorphic_ = ComputeTarget(map, name);
}
}
}
void CallNew::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
is_monomorphic_ = oracle->CallNewIsMonomorphic(this);
if (is_monomorphic_) {
target_ = oracle->GetCallNewTarget(this);
}
}
void CompareOperation::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
TypeInfo info = oracle->CompareType(this);
if (info.IsSmi()) {
compare_type_ = SMI_ONLY;
} else if (info.IsNonPrimitive()) {
compare_type_ = OBJECT_ONLY;
} else {
ASSERT(compare_type_ == NONE);
}
}
void ObjectLiteral::Property::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
receiver_type_ = oracle->ObjectLiteralStoreIsMonomorphic(this)
? oracle->GetObjectLiteralStoreMap(this)
: Handle<Map>::null();
}
// ----------------------------------------------------------------------------
// Implementation of AstVisitor
bool AstVisitor::CheckStackOverflow() {
if (stack_overflow_) return true;
StackLimitCheck check(isolate_);
if (!check.HasOverflowed()) return false;
return (stack_overflow_ = true);
}
void AstVisitor::VisitDeclarations(ZoneList<Declaration*>* declarations) {
for (int i = 0; i < declarations->length(); i++) {
Visit(declarations->at(i));
}
}
void AstVisitor::VisitStatements(ZoneList<Statement*>* statements) {
for (int i = 0; i < statements->length(); i++) {
Visit(statements->at(i));
}
}
void AstVisitor::VisitExpressions(ZoneList<Expression*>* expressions) {
for (int i = 0; i < expressions->length(); i++) {
// The variable statement visiting code may pass NULL expressions
// to this code. Maybe this should be handled by introducing an
// undefined expression or literal? Revisit this code if this
// changes
Expression* expression = expressions->at(i);
if (expression != NULL) Visit(expression);
}
}
// ----------------------------------------------------------------------------
// Regular expressions
#define MAKE_ACCEPT(Name) \
void* RegExp##Name::Accept(RegExpVisitor* visitor, void* data) { \
return visitor->Visit##Name(this, data); \
}
FOR_EACH_REG_EXP_TREE_TYPE(MAKE_ACCEPT)
#undef MAKE_ACCEPT
#define MAKE_TYPE_CASE(Name) \
RegExp##Name* RegExpTree::As##Name() { \
return NULL; \
} \
bool RegExpTree::Is##Name() { return false; }
FOR_EACH_REG_EXP_TREE_TYPE(MAKE_TYPE_CASE)
#undef MAKE_TYPE_CASE
#define MAKE_TYPE_CASE(Name) \
RegExp##Name* RegExp##Name::As##Name() { \
return this; \
} \
bool RegExp##Name::Is##Name() { return true; }
FOR_EACH_REG_EXP_TREE_TYPE(MAKE_TYPE_CASE)
#undef MAKE_TYPE_CASE
static Interval ListCaptureRegisters(ZoneList<RegExpTree*>* children) {
Interval result = Interval::Empty();
for (int i = 0; i < children->length(); i++)
result = result.Union(children->at(i)->CaptureRegisters());
return result;
}
Interval RegExpAlternative::CaptureRegisters() {
return ListCaptureRegisters(nodes());
}
Interval RegExpDisjunction::CaptureRegisters() {
return ListCaptureRegisters(alternatives());
}
Interval RegExpLookahead::CaptureRegisters() {
return body()->CaptureRegisters();
}
Interval RegExpCapture::CaptureRegisters() {
Interval self(StartRegister(index()), EndRegister(index()));
return self.Union(body()->CaptureRegisters());
}
Interval RegExpQuantifier::CaptureRegisters() {
return body()->CaptureRegisters();
}
bool RegExpAssertion::IsAnchoredAtStart() {
return type() == RegExpAssertion::START_OF_INPUT;
}
bool RegExpAssertion::IsAnchoredAtEnd() {
return type() == RegExpAssertion::END_OF_INPUT;
}
bool RegExpAlternative::IsAnchoredAtStart() {
ZoneList<RegExpTree*>* nodes = this->nodes();
for (int i = 0; i < nodes->length(); i++) {
RegExpTree* node = nodes->at(i);
if (node->IsAnchoredAtStart()) { return true; }
if (node->max_match() > 0) { return false; }
}
return false;
}
bool RegExpAlternative::IsAnchoredAtEnd() {
ZoneList<RegExpTree*>* nodes = this->nodes();
for (int i = nodes->length() - 1; i >= 0; i--) {
RegExpTree* node = nodes->at(i);
if (node->IsAnchoredAtEnd()) { return true; }
if (node->max_match() > 0) { return false; }
}
return false;
}
bool RegExpDisjunction::IsAnchoredAtStart() {
ZoneList<RegExpTree*>* alternatives = this->alternatives();
for (int i = 0; i < alternatives->length(); i++) {
if (!alternatives->at(i)->IsAnchoredAtStart())
return false;
}
return true;
}
bool RegExpDisjunction::IsAnchoredAtEnd() {
ZoneList<RegExpTree*>* alternatives = this->alternatives();
for (int i = 0; i < alternatives->length(); i++) {
if (!alternatives->at(i)->IsAnchoredAtEnd())
return false;
}
return true;
}
bool RegExpLookahead::IsAnchoredAtStart() {
return is_positive() && body()->IsAnchoredAtStart();
}
bool RegExpCapture::IsAnchoredAtStart() {
return body()->IsAnchoredAtStart();
}
bool RegExpCapture::IsAnchoredAtEnd() {
return body()->IsAnchoredAtEnd();
}
// Convert regular expression trees to a simple sexp representation.
// This representation should be different from the input grammar
// in as many cases as possible, to make it more difficult for incorrect
// parses to look as correct ones which is likely if the input and
// output formats are alike.
class RegExpUnparser: public RegExpVisitor {
public:
RegExpUnparser();
void VisitCharacterRange(CharacterRange that);
SmartArrayPointer<const char> ToString() { return stream_.ToCString(); }
#define MAKE_CASE(Name) virtual void* Visit##Name(RegExp##Name*, void* data);
FOR_EACH_REG_EXP_TREE_TYPE(MAKE_CASE)
#undef MAKE_CASE
private:
StringStream* stream() { return &stream_; }
HeapStringAllocator alloc_;
StringStream stream_;
};
RegExpUnparser::RegExpUnparser() : stream_(&alloc_) {
}
void* RegExpUnparser::VisitDisjunction(RegExpDisjunction* that, void* data) {
stream()->Add("(|");
for (int i = 0; i < that->alternatives()->length(); i++) {
stream()->Add(" ");
that->alternatives()->at(i)->Accept(this, data);
}
stream()->Add(")");
return NULL;
}
void* RegExpUnparser::VisitAlternative(RegExpAlternative* that, void* data) {
stream()->Add("(:");
for (int i = 0; i < that->nodes()->length(); i++) {
stream()->Add(" ");
that->nodes()->at(i)->Accept(this, data);
}
stream()->Add(")");
return NULL;
}
void RegExpUnparser::VisitCharacterRange(CharacterRange that) {
stream()->Add("%k", that.from());
if (!that.IsSingleton()) {
stream()->Add("-%k", that.to());
}
}
void* RegExpUnparser::VisitCharacterClass(RegExpCharacterClass* that,
void* data) {
if (that->is_negated())
stream()->Add("^");
stream()->Add("[");
for (int i = 0; i < that->ranges()->length(); i++) {
if (i > 0) stream()->Add(" ");
VisitCharacterRange(that->ranges()->at(i));
}
stream()->Add("]");
return NULL;
}
void* RegExpUnparser::VisitAssertion(RegExpAssertion* that, void* data) {
switch (that->type()) {
case RegExpAssertion::START_OF_INPUT:
stream()->Add("@^i");
break;
case RegExpAssertion::END_OF_INPUT:
stream()->Add("@$i");
break;
case RegExpAssertion::START_OF_LINE:
stream()->Add("@^l");
break;
case RegExpAssertion::END_OF_LINE:
stream()->Add("@$l");
break;
case RegExpAssertion::BOUNDARY:
stream()->Add("@b");
break;
case RegExpAssertion::NON_BOUNDARY:
stream()->Add("@B");
break;
}
return NULL;
}
void* RegExpUnparser::VisitAtom(RegExpAtom* that, void* data) {
stream()->Add("'");
Vector<const uc16> chardata = that->data();
for (int i = 0; i < chardata.length(); i++) {
stream()->Add("%k", chardata[i]);
}
stream()->Add("'");
return NULL;
}
void* RegExpUnparser::VisitText(RegExpText* that, void* data) {
if (that->elements()->length() == 1) {
that->elements()->at(0).data.u_atom->Accept(this, data);
} else {
stream()->Add("(!");
for (int i = 0; i < that->elements()->length(); i++) {
stream()->Add(" ");
that->elements()->at(i).data.u_atom->Accept(this, data);
}
stream()->Add(")");
}
return NULL;
}
void* RegExpUnparser::VisitQuantifier(RegExpQuantifier* that, void* data) {
stream()->Add("(# %i ", that->min());
if (that->max() == RegExpTree::kInfinity) {
stream()->Add("- ");
} else {
stream()->Add("%i ", that->max());
}
stream()->Add(that->is_greedy() ? "g " : that->is_possessive() ? "p " : "n ");
that->body()->Accept(this, data);
stream()->Add(")");
return NULL;
}
void* RegExpUnparser::VisitCapture(RegExpCapture* that, void* data) {
stream()->Add("(^ ");
that->body()->Accept(this, data);
stream()->Add(")");
return NULL;
}
void* RegExpUnparser::VisitLookahead(RegExpLookahead* that, void* data) {
stream()->Add("(-> ");
stream()->Add(that->is_positive() ? "+ " : "- ");
that->body()->Accept(this, data);
stream()->Add(")");
return NULL;
}
void* RegExpUnparser::VisitBackReference(RegExpBackReference* that,
void* data) {
stream()->Add("(<- %i)", that->index());
return NULL;
}
void* RegExpUnparser::VisitEmpty(RegExpEmpty* that, void* data) {
stream()->Put('%');
return NULL;
}
SmartArrayPointer<const char> RegExpTree::ToString() {
RegExpUnparser unparser;
Accept(&unparser, NULL);
return unparser.ToString();
}
RegExpDisjunction::RegExpDisjunction(ZoneList<RegExpTree*>* alternatives)
: alternatives_(alternatives) {
ASSERT(alternatives->length() > 1);
RegExpTree* first_alternative = alternatives->at(0);
min_match_ = first_alternative->min_match();
max_match_ = first_alternative->max_match();
for (int i = 1; i < alternatives->length(); i++) {
RegExpTree* alternative = alternatives->at(i);
min_match_ = Min(min_match_, alternative->min_match());
max_match_ = Max(max_match_, alternative->max_match());
}
}
static int IncreaseBy(int previous, int increase) {
if (RegExpTree::kInfinity - previous < increase) {
return RegExpTree::kInfinity;
} else {
return previous + increase;
}
}
RegExpAlternative::RegExpAlternative(ZoneList<RegExpTree*>* nodes)
: nodes_(nodes) {
ASSERT(nodes->length() > 1);
min_match_ = 0;
max_match_ = 0;
for (int i = 0; i < nodes->length(); i++) {
RegExpTree* node = nodes->at(i);
int node_min_match = node->min_match();
min_match_ = IncreaseBy(min_match_, node_min_match);
int node_max_match = node->max_match();
max_match_ = IncreaseBy(max_match_, node_max_match);
}
}
CaseClause::CaseClause(Isolate* isolate,
Expression* label,
ZoneList<Statement*>* statements,
int pos)
: label_(label),
statements_(statements),
position_(pos),
compare_type_(NONE),
compare_id_(AstNode::GetNextId(isolate)),
entry_id_(AstNode::GetNextId(isolate)) {
}
#define REGULAR_NODE(NodeType) \
void AstConstructionVisitor::Visit##NodeType(NodeType* node) { \
increase_node_count(); \
}
#define DONT_OPTIMIZE_NODE(NodeType) \
void AstConstructionVisitor::Visit##NodeType(NodeType* node) { \
increase_node_count(); \
add_flag(kDontOptimize); \
add_flag(kDontInline); \
add_flag(kDontSelfOptimize); \
}
#define DONT_INLINE_NODE(NodeType) \
void AstConstructionVisitor::Visit##NodeType(NodeType* node) { \
increase_node_count(); \
add_flag(kDontInline); \
}
#define DONT_SELFOPTIMIZE_NODE(NodeType) \
void AstConstructionVisitor::Visit##NodeType(NodeType* node) { \
increase_node_count(); \
add_flag(kDontSelfOptimize); \
}
REGULAR_NODE(VariableDeclaration)
REGULAR_NODE(FunctionDeclaration)
REGULAR_NODE(Block)
REGULAR_NODE(ExpressionStatement)
REGULAR_NODE(EmptyStatement)
REGULAR_NODE(IfStatement)
REGULAR_NODE(ContinueStatement)
REGULAR_NODE(BreakStatement)
REGULAR_NODE(ReturnStatement)
REGULAR_NODE(SwitchStatement)
REGULAR_NODE(Conditional)
REGULAR_NODE(Literal)
REGULAR_NODE(ObjectLiteral)
REGULAR_NODE(Assignment)
REGULAR_NODE(Throw)
REGULAR_NODE(Property)
REGULAR_NODE(UnaryOperation)
REGULAR_NODE(CountOperation)
REGULAR_NODE(BinaryOperation)
REGULAR_NODE(CompareOperation)
REGULAR_NODE(ThisFunction)
REGULAR_NODE(Call)
REGULAR_NODE(CallNew)
// In theory, for VariableProxy we'd have to add:
// if (node->var()->IsLookupSlot()) add_flag(kDontInline);
// But node->var() is usually not bound yet at VariableProxy creation time, and
// LOOKUP variables only result from constructs that cannot be inlined anyway.
REGULAR_NODE(VariableProxy)
DONT_OPTIMIZE_NODE(ModuleDeclaration)
DONT_OPTIMIZE_NODE(ImportDeclaration)
DONT_OPTIMIZE_NODE(ExportDeclaration)
DONT_OPTIMIZE_NODE(ModuleLiteral)
DONT_OPTIMIZE_NODE(ModuleVariable)
DONT_OPTIMIZE_NODE(ModulePath)
DONT_OPTIMIZE_NODE(ModuleUrl)
DONT_OPTIMIZE_NODE(WithStatement)
DONT_OPTIMIZE_NODE(TryCatchStatement)
DONT_OPTIMIZE_NODE(TryFinallyStatement)
DONT_OPTIMIZE_NODE(DebuggerStatement)
DONT_OPTIMIZE_NODE(SharedFunctionInfoLiteral)
DONT_INLINE_NODE(FunctionLiteral)
DONT_INLINE_NODE(RegExpLiteral) // TODO(1322): Allow materialized literals.
DONT_INLINE_NODE(ArrayLiteral) // TODO(1322): Allow materialized literals.
DONT_SELFOPTIMIZE_NODE(DoWhileStatement)
DONT_SELFOPTIMIZE_NODE(WhileStatement)
DONT_SELFOPTIMIZE_NODE(ForStatement)
DONT_SELFOPTIMIZE_NODE(ForInStatement)
void AstConstructionVisitor::VisitCallRuntime(CallRuntime* node) {
increase_node_count();
if (node->is_jsruntime()) {
// Don't try to inline JS runtime calls because we don't (currently) even
// optimize them.
add_flag(kDontInline);
} else if (node->function()->intrinsic_type == Runtime::INLINE &&
(node->name()->IsEqualTo(CStrVector("_ArgumentsLength")) ||
node->name()->IsEqualTo(CStrVector("_Arguments")))) {
// Don't inline the %_ArgumentsLength or %_Arguments because their
// implementation will not work. There is no stack frame to get them
// from.
add_flag(kDontInline);
}
}
#undef REGULAR_NODE
#undef DONT_OPTIMIZE_NODE
#undef DONT_INLINE_NODE
#undef DONT_SELFOPTIMIZE_NODE
Handle<String> Literal::ToString() {
if (handle_->IsString()) return Handle<String>::cast(handle_);
ASSERT(handle_->IsNumber());
char arr[100];
Vector<char> buffer(arr, ARRAY_SIZE(arr));
const char* str;
if (handle_->IsSmi()) {
// Optimization only, the heap number case would subsume this.
OS::SNPrintF(buffer, "%d", Smi::cast(*handle_)->value());
str = arr;
} else {
str = DoubleToCString(handle_->Number(), buffer);
}
return FACTORY->NewStringFromAscii(CStrVector(str));
}
} } // namespace v8::internal
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