v8/src/type-info.h
mstarzinger@chromium.org 0ab3fb8b00 Implement non-generic stores for object literals.
This uses the type feedback already present for computed value stores
into object literals to generate optimized stores in Crankshaft, thus
avoiding unnecessary generic stores with side effects.

R=svenpanne@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9692036

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11023 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2012-03-13 12:11:46 +00:00

326 lines
10 KiB
C++

// 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 "ast.h"
#include "globals.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 Symbol.
static TypeInfo Symbol() { return TypeInfo(kSymbol); }
// 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 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 TypeFromValue(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 IsSymbol() {
ASSERT(type_ != kUninitialized);
return ((type_ & kSymbol) == kSymbol);
}
inline bool IsNonSymbol() {
ASSERT(type_ != kUninitialized);
return ((type_ & kSymbol) == 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 kSymbol: return "Symbol";
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
kSymbol = 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.
class Assignment;
class BinaryOperation;
class Call;
class CallNew;
class CaseClause;
class CompareOperation;
class CompilationInfo;
class CountOperation;
class Expression;
class Property;
class SmallMapList;
class UnaryOperation;
class ForInStatement;
class TypeFeedbackOracle BASE_EMBEDDED {
public:
TypeFeedbackOracle(Handle<Code> code,
Handle<Context> global_context,
Isolate* isolate);
bool LoadIsMonomorphicNormal(Property* expr);
bool LoadIsMegamorphicWithTypeInfo(Property* expr);
bool StoreIsMonomorphicNormal(Expression* expr);
bool StoreIsMegamorphicWithTypeInfo(Expression* expr);
bool CallIsMonomorphic(Call* expr);
bool CallNewIsMonomorphic(CallNew* expr);
bool ObjectLiteralStoreIsMonomorphic(ObjectLiteral::Property* prop);
bool IsForInFastCase(ForInStatement* expr);
Handle<Map> LoadMonomorphicReceiverType(Property* expr);
Handle<Map> StoreMonomorphicReceiverType(Expression* expr);
void LoadReceiverTypes(Property* expr,
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(unsigned ast_id,
SmallMapList* types);
static bool CanRetainOtherContext(Map* map, Context* global_context);
static bool CanRetainOtherContext(JSFunction* function,
Context* global_context);
CheckType GetCallCheckType(Call* expr);
Handle<JSObject> GetPrototypeForPrimitiveCheck(CheckType check);
Handle<JSFunction> GetCallTarget(Call* expr);
Handle<JSFunction> GetCallNewTarget(CallNew* expr);
Handle<Map> GetObjectLiteralStoreMap(ObjectLiteral::Property* prop);
bool LoadIsBuiltin(Property* expr, Builtins::Name id);
// TODO(1571) We can't use ToBooleanStub::Types as the return value because
// of various cylces in our headers. Death to tons of implementations in
// headers!! :-P
byte ToBooleanTypes(unsigned ast_id);
// Get type information for arithmetic operations and compares.
TypeInfo UnaryType(UnaryOperation* expr);
TypeInfo BinaryType(BinaryOperation* expr);
TypeInfo CompareType(CompareOperation* expr);
bool IsSymbolCompare(CompareOperation* expr);
Handle<Map> GetCompareMap(CompareOperation* expr);
TypeInfo SwitchType(CaseClause* clause);
TypeInfo IncrementType(CountOperation* expr);
private:
void CollectReceiverTypes(unsigned ast_id,
Handle<String> name,
Code::Flags flags,
SmallMapList* types);
void SetInfo(unsigned 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(unsigned ast_id);
Handle<Context> global_context_;
Isolate* isolate_;
Handle<UnseededNumberDictionary> dictionary_;
DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle);
};
} } // namespace v8::internal
#endif // V8_TYPE_INFO_H_