90b3370374
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5922 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
283 lines
8.8 KiB
C++
283 lines
8.8 KiB
C++
// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_TYPE_INFO_H_
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#define V8_TYPE_INFO_H_
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#include "globals.h"
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#include "zone.h"
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#include "zone-inl.h"
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namespace v8 {
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namespace internal {
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// Unknown
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// | |
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// | \--------------|
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// Primitive Non-primitive
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// | \--------| |
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// Number String |
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// / | | |
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// Double Integer32 | /
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// | | / /
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// | Smi / /
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// | | / /
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// | | / /
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// Uninitialized.--/
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class TypeInfo {
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public:
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TypeInfo() : type_(kUninitialized) { }
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static TypeInfo Unknown() { return TypeInfo(kUnknown); }
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// We know it's a primitive type.
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static TypeInfo Primitive() { return TypeInfo(kPrimitive); }
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// We know it's a number of some sort.
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static TypeInfo Number() { return TypeInfo(kNumber); }
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// We know it's a signed 32 bit integer.
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static TypeInfo Integer32() { return TypeInfo(kInteger32); }
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// We know it's a Smi.
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static TypeInfo Smi() { return TypeInfo(kSmi); }
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// We know it's a heap number.
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static TypeInfo Double() { return TypeInfo(kDouble); }
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// We know it's a string.
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static TypeInfo String() { return TypeInfo(kString); }
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// We know it's a non-primitive (object) type.
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static TypeInfo NonPrimitive() { return TypeInfo(kNonPrimitive); }
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// We haven't started collecting info yet.
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static TypeInfo Uninitialized() { return TypeInfo(kUninitialized); }
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// Return compact representation. Very sensitive to enum values below!
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// Compacting drops information about primitive types and strings types.
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// We use the compact representation when we only care about number types.
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int ThreeBitRepresentation() {
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ASSERT(type_ != kUninitialized);
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int answer = type_ & 0xf;
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answer = answer > 6 ? answer - 2 : answer;
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ASSERT(answer >= 0);
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ASSERT(answer <= 7);
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return answer;
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}
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// Decode compact representation. Very sensitive to enum values below!
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static TypeInfo ExpandedRepresentation(int three_bit_representation) {
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Type t = static_cast<Type>(three_bit_representation > 4 ?
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three_bit_representation + 2 :
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three_bit_representation);
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t = (t == kUnknown) ? t : static_cast<Type>(t | kPrimitive);
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ASSERT(t == kUnknown ||
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t == kNumber ||
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t == kInteger32 ||
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t == kSmi ||
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t == kDouble);
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return TypeInfo(t);
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}
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int ToInt() {
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return type_;
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}
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static TypeInfo FromInt(int bit_representation) {
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Type t = static_cast<Type>(bit_representation);
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ASSERT(t == kUnknown ||
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t == kPrimitive ||
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t == kNumber ||
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t == kInteger32 ||
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t == kSmi ||
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t == kDouble ||
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t == kString ||
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t == kNonPrimitive);
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return TypeInfo(t);
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}
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// Return the weakest (least precise) common type.
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static TypeInfo Combine(TypeInfo a, TypeInfo b) {
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return TypeInfo(static_cast<Type>(a.type_ & b.type_));
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}
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// Integer32 is an integer that can be represented as either a signed
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// 32-bit integer or as an unsigned 32-bit integer. It has to be
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// in the range [-2^31, 2^32 - 1]. We also have to check for negative 0
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// as it is not an Integer32.
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static inline bool IsInt32Double(double value) {
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const DoubleRepresentation minus_zero(-0.0);
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DoubleRepresentation rep(value);
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if (rep.bits == minus_zero.bits) return false;
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if (value >= kMinInt && value <= kMaxInt &&
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value == static_cast<int32_t>(value)) {
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return true;
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}
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return false;
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}
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static TypeInfo TypeFromValue(Handle<Object> value);
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bool Equals(const TypeInfo& other) {
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return type_ == other.type_;
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}
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inline bool IsUnknown() {
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ASSERT(type_ != kUninitialized);
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return type_ == kUnknown;
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}
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inline bool IsPrimitive() {
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ASSERT(type_ != kUninitialized);
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return ((type_ & kPrimitive) == kPrimitive);
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}
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inline bool IsNumber() {
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ASSERT(type_ != kUninitialized);
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return ((type_ & kNumber) == kNumber);
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}
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inline bool IsSmi() {
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ASSERT(type_ != kUninitialized);
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return ((type_ & kSmi) == kSmi);
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}
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inline bool IsInteger32() {
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ASSERT(type_ != kUninitialized);
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return ((type_ & kInteger32) == kInteger32);
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}
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inline bool IsDouble() {
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ASSERT(type_ != kUninitialized);
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return ((type_ & kDouble) == kDouble);
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}
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inline bool IsString() {
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ASSERT(type_ != kUninitialized);
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return ((type_ & kString) == kString);
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}
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inline bool IsNonPrimitive() {
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ASSERT(type_ != kUninitialized);
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return ((type_ & kNonPrimitive) == kNonPrimitive);
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}
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inline bool IsUninitialized() {
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return type_ == kUninitialized;
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}
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const char* ToString() {
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switch (type_) {
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case kUnknown: return "Unknown";
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case kPrimitive: return "Primitive";
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case kNumber: return "Number";
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case kInteger32: return "Integer32";
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case kSmi: return "Smi";
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case kDouble: return "Double";
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case kString: return "String";
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case kNonPrimitive: return "Object";
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case kUninitialized: return "Uninitialized";
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}
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UNREACHABLE();
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return "Unreachable code";
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}
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private:
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enum Type {
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kUnknown = 0, // 0000000
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kPrimitive = 0x10, // 0010000
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kNumber = 0x11, // 0010001
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kInteger32 = 0x13, // 0010011
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kSmi = 0x17, // 0010111
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kDouble = 0x19, // 0011001
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kString = 0x30, // 0110000
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kNonPrimitive = 0x40, // 1000000
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kUninitialized = 0x7f // 1111111
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};
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explicit inline TypeInfo(Type t) : type_(t) { }
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Type type_;
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};
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// Forward declarations.
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class Assignment;
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class BinaryOperation;
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class Call;
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class CompareOperation;
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class CompilationInfo;
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class Property;
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class CaseClause;
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class TypeFeedbackOracle BASE_EMBEDDED {
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public:
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enum Side {
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LEFT,
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RIGHT,
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RESULT
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};
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explicit TypeFeedbackOracle(Handle<Code> code);
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bool LoadIsMonomorphic(Property* expr);
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bool StoreIsMonomorphic(Assignment* expr);
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bool CallIsMonomorphic(Call* expr);
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Handle<Map> LoadMonomorphicReceiverType(Property* expr);
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Handle<Map> StoreMonomorphicReceiverType(Assignment* expr);
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Handle<Map> CallMonomorphicReceiverType(Call* expr);
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ZoneMapList* LoadReceiverTypes(Property* expr, Handle<String> name);
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ZoneMapList* StoreReceiverTypes(Assignment* expr, Handle<String> name);
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ZoneMapList* CallReceiverTypes(Call* expr, Handle<String> name);
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bool LoadIsBuiltin(Property* expr, Builtins::Name id);
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// Get type information for arithmetic operations and compares.
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TypeInfo BinaryType(BinaryOperation* expr, Side side);
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TypeInfo CompareType(CompareOperation* expr, Side side);
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TypeInfo SwitchType(CaseClause* clause);
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private:
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void Initialize(Handle<Code> code);
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bool IsMonomorphic(int pos) { return GetElement(map_, pos)->IsMap(); }
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ZoneMapList* CollectReceiverTypes(int position,
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Handle<String> name,
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Code::Flags flags);
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void PopulateMap(Handle<Code> code);
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void CollectPositions(Code* code,
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List<int>* code_positions,
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List<int>* source_positions);
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Handle<JSObject> map_;
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DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle);
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};
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} } // namespace v8::internal
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#endif // V8_TYPE_INFO_H_
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