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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.
#ifndef V8_TYPE_INFO_H_
#define V8_TYPE_INFO_H_
#include "allocation.h"
#include "globals.h"
#include "types.h"
#include "zone-inl.h"
namespace v8 {
namespace internal {
const int kMaxKeyedPolymorphism = 4;
// Unknown
// | \____________
// | |
// Primitive Non-primitive
// | \_______ |
// | | |
// Number String |
// / \ | |
// Double Integer32 | /
// | | / /
// | Smi / /
// | | / __/
// Uninitialized.
class TypeInfo {
public:
TypeInfo() : type_(kUninitialized) { }
static TypeInfo Unknown() { return TypeInfo(kUnknown); }
// We know it's a primitive type.
static TypeInfo Primitive() { return TypeInfo(kPrimitive); }
// We know it's a number of some sort.
static TypeInfo Number() { return TypeInfo(kNumber); }
// We know it's a signed 32 bit integer.
static TypeInfo Integer32() { return TypeInfo(kInteger32); }
// We know it's a Smi.
static TypeInfo Smi() { return TypeInfo(kSmi); }
// We know it's a heap number.
static TypeInfo Double() { return TypeInfo(kDouble); }
// We know it's a string.
static TypeInfo String() { return TypeInfo(kString); }
// We know it's an internalized string.
static TypeInfo InternalizedString() { return TypeInfo(kInternalizedString); }
// We know it's a non-primitive (object) type.
static TypeInfo NonPrimitive() { return TypeInfo(kNonPrimitive); }
// We haven't started collecting info yet.
static TypeInfo Uninitialized() { return TypeInfo(kUninitialized); }
int ToInt() {
return type_;
}
static TypeInfo FromInt(int bit_representation) {
Type t = static_cast<Type>(bit_representation);
ASSERT(t == kUnknown ||
t == kPrimitive ||
t == kNumber ||
t == kInteger32 ||
t == kSmi ||
t == kDouble ||
t == kString ||
t == kNonPrimitive);
return TypeInfo(t);
}
// Return the weakest (least precise) common type.
static TypeInfo Combine(TypeInfo a, TypeInfo b) {
return TypeInfo(static_cast<Type>(a.type_ & b.type_));
}
// Integer32 is an integer that can be represented as a signed
// 32-bit integer. It has to be
// in the range [-2^31, 2^31 - 1]. We also have to check for negative 0
// as it is not an Integer32.
static inline bool IsInt32Double(double value) {
const DoubleRepresentation minus_zero(-0.0);
DoubleRepresentation rep(value);
if (rep.bits == minus_zero.bits) return false;
if (value >= kMinInt && value <= kMaxInt &&
value == static_cast<int32_t>(value)) {
return true;
}
return false;
}
static TypeInfo FromValue(Handle<Object> value);
bool Equals(const TypeInfo& other) {
return type_ == other.type_;
}
inline bool IsUnknown() {
ASSERT(type_ != kUninitialized);
return type_ == kUnknown;
}
inline bool IsPrimitive() {
ASSERT(type_ != kUninitialized);
return ((type_ & kPrimitive) == kPrimitive);
}
inline bool IsNumber() {
ASSERT(type_ != kUninitialized);
return ((type_ & kNumber) == kNumber);
}
inline bool IsSmi() {
ASSERT(type_ != kUninitialized);
return ((type_ & kSmi) == kSmi);
}
inline bool IsInternalizedString() {
ASSERT(type_ != kUninitialized);
return ((type_ & kInternalizedString) == kInternalizedString);
}
inline bool IsNonInternalizedString() {
ASSERT(type_ != kUninitialized);
return ((type_ & kInternalizedString) == kString);
}
inline bool IsInteger32() {
ASSERT(type_ != kUninitialized);
return ((type_ & kInteger32) == kInteger32);
}
inline bool IsDouble() {
ASSERT(type_ != kUninitialized);
return ((type_ & kDouble) == kDouble);
}
inline bool IsString() {
ASSERT(type_ != kUninitialized);
return ((type_ & kString) == kString);
}
inline bool IsNonPrimitive() {
ASSERT(type_ != kUninitialized);
return ((type_ & kNonPrimitive) == kNonPrimitive);
}
inline bool IsUninitialized() {
return type_ == kUninitialized;
}
const char* ToString() {
switch (type_) {
case kUnknown: return "Unknown";
case kPrimitive: return "Primitive";
case kNumber: return "Number";
case kInteger32: return "Integer32";
case kSmi: return "Smi";
case kInternalizedString: return "InternalizedString";
case kDouble: return "Double";
case kString: return "String";
case kNonPrimitive: return "Object";
case kUninitialized: return "Uninitialized";
}
UNREACHABLE();
return "Unreachable code";
}
private:
enum Type {
kUnknown = 0, // 0000000
kPrimitive = 0x10, // 0010000
kNumber = 0x11, // 0010001
kInteger32 = 0x13, // 0010011
kSmi = 0x17, // 0010111
kDouble = 0x19, // 0011001
kString = 0x30, // 0110000
kInternalizedString = 0x32, // 0110010
kNonPrimitive = 0x40, // 1000000
kUninitialized = 0x7f // 1111111
};
explicit inline TypeInfo(Type t) : type_(t) { }
Type type_;
};
enum StringStubFeedback {
DEFAULT_STRING_STUB = 0,
STRING_INDEX_OUT_OF_BOUNDS = 1
};
// Forward declarations.
// TODO(rossberg): these should all go away eventually.
class Assignment;
class Call;
class CallNew;
class CaseClause;
class CompilationInfo;
class CountOperation;
class Expression;
class ForInStatement;
class ICStub;
class Property;
class SmallMapList;
class ObjectLiteral;
class ObjectLiteralProperty;
class TypeFeedbackOracle: public ZoneObject {
public:
TypeFeedbackOracle(Handle<Code> code,
Handle<Context> native_context,
Isolate* isolate,
Zone* zone);
bool LoadIsMonomorphicNormal(TypeFeedbackId id);
bool LoadIsUninitialized(TypeFeedbackId id);
bool LoadIsPreMonomorphic(TypeFeedbackId id);
bool LoadIsPolymorphic(TypeFeedbackId id);
bool StoreIsUninitialized(TypeFeedbackId ast_id);
bool StoreIsMonomorphicNormal(TypeFeedbackId ast_id);
bool StoreIsPreMonomorphic(TypeFeedbackId ast_id);
bool StoreIsKeyedPolymorphic(TypeFeedbackId ast_id);
bool CallIsMonomorphic(Call* expr);
bool KeyedArrayCallIsHoley(Call* expr);
bool CallNewIsMonomorphic(CallNew* expr);
bool ObjectLiteralStoreIsMonomorphic(ObjectLiteralProperty* prop);
// TODO(1571) We can't use ForInStatement::ForInType as the return value due
// to various cycles in our headers.
// TODO(rossberg): once all oracle access is removed from ast.cc, it should
// be possible.
byte ForInType(TypeFeedbackId id);
Handle<Map> LoadMonomorphicReceiverType(TypeFeedbackId id);
Handle<Map> StoreMonomorphicReceiverType(TypeFeedbackId id);
KeyedAccessStoreMode GetStoreMode(TypeFeedbackId ast_id);
void LoadReceiverTypes(TypeFeedbackId id,
Handle<String> name,
SmallMapList* types);
void StoreReceiverTypes(Assignment* expr,
Handle<String> name,
SmallMapList* types);
void CallReceiverTypes(Call* expr,
Handle<String> name,
CallKind call_kind,
SmallMapList* types);
void CollectKeyedReceiverTypes(TypeFeedbackId ast_id,
SmallMapList* types);
void CollectPolymorphicStoreReceiverTypes(TypeFeedbackId ast_id,
SmallMapList* types);
void PropertyReceiverTypes(TypeFeedbackId id,
Handle<String> name,
SmallMapList* receiver_types,
bool* is_prototype);
void KeyedPropertyReceiverTypes(TypeFeedbackId id,
SmallMapList* receiver_types,
bool* is_string);
void CountReceiverTypes(TypeFeedbackId id,
SmallMapList* receiver_types);
static bool CanRetainOtherContext(Map* map, Context* native_context);
static bool CanRetainOtherContext(JSFunction* function,
Context* native_context);
void CollectPolymorphicMaps(Handle<Code> code, SmallMapList* types);
CheckType GetCallCheckType(Call* expr);
Handle<JSFunction> GetCallTarget(Call* expr);
Handle<JSFunction> GetCallNewTarget(CallNew* expr);
Handle<Cell> GetCallNewAllocationInfoCell(CallNew* expr);
Handle<Map> GetObjectLiteralStoreMap(ObjectLiteralProperty* prop);
bool LoadIsBuiltin(TypeFeedbackId id, Builtins::Name builtin_id);
bool LoadIsStub(TypeFeedbackId id, ICStub* stub);
// TODO(1571) We can't use ToBooleanStub::Types as the return value because
// of various cycles in our headers. Death to tons of implementations in
// headers!! :-P
byte ToBooleanTypes(TypeFeedbackId id);
// Get type information for arithmetic operations and compares.
void BinaryType(TypeFeedbackId id,
Handle<Type>* left,
Handle<Type>* right,
Handle<Type>* result,
Maybe<int>* fixed_right_arg,
Token::Value operation);
void CompareType(TypeFeedbackId id,
Handle<Type>* left,
Handle<Type>* right,
Handle<Type>* combined);
Handle<Type> CountType(TypeFeedbackId id);
Handle<Type> ClauseType(TypeFeedbackId id);
Zone* zone() const { return zone_; }
Isolate* isolate() const { return isolate_; }
private:
void CollectReceiverTypes(TypeFeedbackId ast_id,
Handle<String> name,
Code::Flags flags,
SmallMapList* types);
void SetInfo(TypeFeedbackId ast_id, Object* target);
void BuildDictionary(Handle<Code> code);
void GetRelocInfos(Handle<Code> code, ZoneList<RelocInfo>* infos);
void CreateDictionary(Handle<Code> code, ZoneList<RelocInfo>* infos);
void RelocateRelocInfos(ZoneList<RelocInfo>* infos,
byte* old_start,
byte* new_start);
void ProcessRelocInfos(ZoneList<RelocInfo>* infos);
void ProcessTypeFeedbackCells(Handle<Code> code);
// Returns an element from the backing store. Returns undefined if
// there is no information.
Handle<Object> GetInfo(TypeFeedbackId ast_id);
// Return the cell that contains type feedback.
Handle<Cell> GetInfoCell(TypeFeedbackId ast_id);
private:
Handle<Context> native_context_;
Isolate* isolate_;
Zone* zone_;
Handle<UnseededNumberDictionary> dictionary_;
DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle);
};
} } // namespace v8::internal
#endif // V8_TYPE_INFO_H_