Update V8 to r4588
We're using WebKit r58033, as used by
http://src.chromium.org/svn/releases/5.0.387.0/DEPS
This requires http://v8.googlecode.com/svn/trunk@4465 but this version has a
crashing bug for ARM. Instead we use http://v8.googlecode.com/svn/trunk@4588,
which is used by http://src.chromium.org/svn/releases/6.0.399.0/DEPS
Note that a trivial bug fix was required in arm/codegen-arm.cc. This is guarded
with ANDROID. See http://code.google.com/p/v8/issues/detail?id=703
Change-Id: I459647a8286c4f8c7405f0c5581ecbf051a6f1e8
diff --git a/src/type-info.h b/src/type-info.h
new file mode 100644
index 0000000..568437a
--- /dev/null
+++ b/src/type-info.h
@@ -0,0 +1,244 @@
+// Copyright 2010 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 "globals.h"
+
+namespace v8 {
+namespace internal {
+
+// Unknown
+// |
+// PrimitiveType
+// | \--------|
+// Number String
+// / | |
+// Double Integer32 |
+// | | /
+// | Smi /
+// | / /
+// Uninitialized.
+
+class TypeInfo {
+ public:
+ TypeInfo() { }
+
+ static inline TypeInfo Unknown();
+ // We know it's a primitive type.
+ static inline TypeInfo Primitive();
+ // We know it's a number of some sort.
+ static inline TypeInfo Number();
+ // We know it's signed or unsigned 32 bit integer.
+ static inline TypeInfo Integer32();
+ // We know it's a Smi.
+ static inline TypeInfo Smi();
+ // We know it's a heap number.
+ static inline TypeInfo Double();
+ // We know it's a string.
+ static inline TypeInfo String();
+ // We haven't started collecting info yet.
+ static inline TypeInfo Uninitialized();
+
+ // Return compact representation. Very sensitive to enum values below!
+ // Compacting drops information about primtive types and strings types.
+ // We use the compact representation when we only care about number types.
+ int ThreeBitRepresentation() {
+ ASSERT(type_ != kUninitializedType);
+ int answer = type_ & 0xf;
+ answer = answer > 6 ? answer - 2 : answer;
+ ASSERT(answer >= 0);
+ ASSERT(answer <= 7);
+ return answer;
+ }
+
+ // Decode compact representation. Very sensitive to enum values below!
+ static TypeInfo ExpandedRepresentation(int three_bit_representation) {
+ Type t = static_cast<Type>(three_bit_representation >= 6 ?
+ three_bit_representation + 2 :
+ three_bit_representation);
+ t = (t == kUnknownType) ? t : static_cast<Type>(t | kPrimitiveType);
+ ASSERT(t == kUnknownType ||
+ t == kNumberType ||
+ t == kInteger32Type ||
+ t == kSmiType ||
+ t == kDoubleType);
+ return TypeInfo(t);
+ }
+
+ int ToInt() {
+ return type_;
+ }
+
+ static TypeInfo FromInt(int bit_representation) {
+ Type t = static_cast<Type>(bit_representation);
+ ASSERT(t == kUnknownType ||
+ t == kPrimitiveType ||
+ t == kNumberType ||
+ t == kInteger32Type ||
+ t == kSmiType ||
+ t == kDoubleType ||
+ t == kStringType);
+ 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 either a signed
+ // 32-bit integer or as an unsigned 32-bit integer. It has to be
+ // in the range [-2^31, 2^32 - 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 <= kMaxUInt32) {
+ if (value <= kMaxInt && value == static_cast<int32_t>(value)) {
+ return true;
+ }
+ if (value == static_cast<uint32_t>(value)) return true;
+ }
+ return false;
+ }
+
+ static TypeInfo TypeFromValue(Handle<Object> value);
+
+ inline bool IsUnknown() {
+ return type_ == kUnknownType;
+ }
+
+ inline bool IsNumber() {
+ ASSERT(type_ != kUninitializedType);
+ return ((type_ & kNumberType) == kNumberType);
+ }
+
+ inline bool IsSmi() {
+ ASSERT(type_ != kUninitializedType);
+ return ((type_ & kSmiType) == kSmiType);
+ }
+
+ inline bool IsInteger32() {
+ ASSERT(type_ != kUninitializedType);
+ return ((type_ & kInteger32Type) == kInteger32Type);
+ }
+
+ inline bool IsDouble() {
+ ASSERT(type_ != kUninitializedType);
+ return ((type_ & kDoubleType) == kDoubleType);
+ }
+
+ inline bool IsString() {
+ ASSERT(type_ != kUninitializedType);
+ return ((type_ & kStringType) == kStringType);
+ }
+
+ inline bool IsUninitialized() {
+ return type_ == kUninitializedType;
+ }
+
+ const char* ToString() {
+ switch (type_) {
+ case kUnknownType: return "UnknownType";
+ case kPrimitiveType: return "PrimitiveType";
+ case kNumberType: return "NumberType";
+ case kInteger32Type: return "Integer32Type";
+ case kSmiType: return "SmiType";
+ case kDoubleType: return "DoubleType";
+ case kStringType: return "StringType";
+ case kUninitializedType:
+ UNREACHABLE();
+ return "UninitializedType";
+ }
+ UNREACHABLE();
+ return "Unreachable code";
+ }
+
+ private:
+ // We use 6 bits to represent the types.
+ enum Type {
+ kUnknownType = 0, // 000000
+ kPrimitiveType = 0x10, // 010000
+ kNumberType = 0x11, // 010001
+ kInteger32Type = 0x13, // 010011
+ kSmiType = 0x17, // 010111
+ kDoubleType = 0x19, // 011001
+ kStringType = 0x30, // 110000
+ kUninitializedType = 0x3f // 111111
+ };
+ explicit inline TypeInfo(Type t) : type_(t) { }
+
+ Type type_;
+};
+
+
+TypeInfo TypeInfo::Unknown() {
+ return TypeInfo(kUnknownType);
+}
+
+
+TypeInfo TypeInfo::Primitive() {
+ return TypeInfo(kPrimitiveType);
+}
+
+
+TypeInfo TypeInfo::Number() {
+ return TypeInfo(kNumberType);
+}
+
+
+TypeInfo TypeInfo::Integer32() {
+ return TypeInfo(kInteger32Type);
+}
+
+
+TypeInfo TypeInfo::Smi() {
+ return TypeInfo(kSmiType);
+}
+
+
+TypeInfo TypeInfo::Double() {
+ return TypeInfo(kDoubleType);
+}
+
+
+TypeInfo TypeInfo::String() {
+ return TypeInfo(kStringType);
+}
+
+
+TypeInfo TypeInfo::Uninitialized() {
+ return TypeInfo(kUninitializedType);
+}
+
+} } // namespace v8::internal
+
+#endif // V8_TYPE_INFO_H_