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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /mfbt/decimal/Decimal.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/*
+ * Copyright (C) 2012 Google Inc. 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.
+ */
+
+/**
+ * Imported from:
+ * https://chromium.googlesource.com/chromium/src.git/+/master/third_party/WebKit/Source/platform/Decimal.h
+ * Check UPSTREAM-GIT-SHA for the commit ID of the last update from Blink core.
+ */
+
+#ifndef Decimal_h
+#define Decimal_h
+
+#include "mozilla/Assertions.h"
+#include <stdint.h>
+#include "mozilla/Types.h"
+
+#include <string>
+
+#ifndef ASSERT
+#define DEFINED_ASSERT_FOR_DECIMAL_H 1
+#define ASSERT MOZ_ASSERT
+#endif
+
+#define PLATFORM_EXPORT
+
+// To use USING_FAST_MALLOC we'd need:
+// https://chromium.googlesource.com/chromium/src.git/+/master/third_party/WebKit/Source/wtf/Allocator.h
+// Since we don't allocate Decimal objects, no need.
+#define USING_FAST_MALLOC(type) \
+ void ignore_this_dummy_method() = delete
+
+#define DISALLOW_NEW() \
+ private: \
+ void* operator new(size_t) = delete; \
+ void* operator new(size_t, void*) = delete; \
+ public:
+
+namespace blink {
+
+namespace DecimalPrivate {
+class SpecialValueHandler;
+}
+
+// This class represents decimal base floating point number.
+//
+// FIXME: Once all C++ compiler support decimal type, we should replace this
+// class to compiler supported one. See below URI for current status of decimal
+// type for C++: // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1977.html
+class PLATFORM_EXPORT Decimal {
+ USING_FAST_MALLOC(Decimal);
+public:
+ enum Sign {
+ Positive,
+ Negative,
+ };
+
+ // You should not use EncodedData other than unit testing.
+ class EncodedData {
+ DISALLOW_NEW();
+ // For accessing FormatClass.
+ friend class Decimal;
+ friend class DecimalPrivate::SpecialValueHandler;
+ public:
+ EncodedData(Sign, int exponent, uint64_t coefficient);
+
+ bool operator==(const EncodedData&) const;
+ bool operator!=(const EncodedData& another) const { return !operator==(another); }
+
+ uint64_t coefficient() const { return m_coefficient; }
+ int countDigits() const;
+ int exponent() const { return m_exponent; }
+ bool isFinite() const { return !isSpecial(); }
+ bool isInfinity() const { return m_formatClass == ClassInfinity; }
+ bool isNaN() const { return m_formatClass == ClassNaN; }
+ bool isSpecial() const { return m_formatClass == ClassInfinity || m_formatClass == ClassNaN; }
+ bool isZero() const { return m_formatClass == ClassZero; }
+ Sign sign() const { return m_sign; }
+ void setSign(Sign sign) { m_sign = sign; }
+
+ private:
+ enum FormatClass {
+ ClassInfinity,
+ ClassNormal,
+ ClassNaN,
+ ClassZero,
+ };
+
+ EncodedData(Sign, FormatClass);
+ FormatClass formatClass() const { return m_formatClass; }
+
+ uint64_t m_coefficient;
+ int16_t m_exponent;
+ FormatClass m_formatClass;
+ Sign m_sign;
+ };
+
+ MFBT_API explicit Decimal(int32_t = 0);
+ MFBT_API Decimal(Sign, int exponent, uint64_t coefficient);
+ MFBT_API Decimal(const Decimal&);
+
+ MFBT_API Decimal& operator=(const Decimal&);
+ MFBT_API Decimal& operator+=(const Decimal&);
+ MFBT_API Decimal& operator-=(const Decimal&);
+ MFBT_API Decimal& operator*=(const Decimal&);
+ MFBT_API Decimal& operator/=(const Decimal&);
+
+ MFBT_API Decimal operator-() const;
+
+ MFBT_API bool operator==(const Decimal&) const;
+ MFBT_API bool operator!=(const Decimal&) const;
+ MFBT_API bool operator<(const Decimal&) const;
+ MFBT_API bool operator<=(const Decimal&) const;
+ MFBT_API bool operator>(const Decimal&) const;
+ MFBT_API bool operator>=(const Decimal&) const;
+
+ MFBT_API Decimal operator+(const Decimal&) const;
+ MFBT_API Decimal operator-(const Decimal&) const;
+ MFBT_API Decimal operator*(const Decimal&) const;
+ MFBT_API Decimal operator/(const Decimal&) const;
+
+ int exponent() const
+ {
+ ASSERT(isFinite());
+ return m_data.exponent();
+ }
+
+ bool isFinite() const { return m_data.isFinite(); }
+ bool isInfinity() const { return m_data.isInfinity(); }
+ bool isNaN() const { return m_data.isNaN(); }
+ bool isNegative() const { return sign() == Negative; }
+ bool isPositive() const { return sign() == Positive; }
+ bool isSpecial() const { return m_data.isSpecial(); }
+ bool isZero() const { return m_data.isZero(); }
+
+ MFBT_API Decimal abs() const;
+ MFBT_API Decimal ceil() const;
+ MFBT_API Decimal floor() const;
+ MFBT_API Decimal remainder(const Decimal&) const;
+ MFBT_API Decimal round() const;
+
+ MFBT_API double toDouble() const;
+ // Note: toString method supports infinity and nan but fromString not.
+ MFBT_API std::string toString() const;
+ MFBT_API bool toString(char* strBuf, size_t bufLength) const;
+
+ static MFBT_API Decimal fromDouble(double);
+ // fromString supports following syntax EBNF:
+ // number ::= sign? digit+ ('.' digit*) (exponent-marker sign? digit+)?
+ // | sign? '.' digit+ (exponent-marker sign? digit+)?
+ // sign ::= '+' | '-'
+ // exponent-marker ::= 'e' | 'E'
+ // digit ::= '0' | '1' | ... | '9'
+ // Note: fromString doesn't support "infinity" and "nan".
+ static MFBT_API Decimal fromString(const std::string& aValue);
+ static MFBT_API Decimal infinity(Sign);
+ static MFBT_API Decimal nan();
+ static MFBT_API Decimal zero(Sign);
+
+ // You should not use below methods. We expose them for unit testing.
+ MFBT_API explicit Decimal(const EncodedData&);
+ const EncodedData& value() const { return m_data; }
+
+private:
+ struct AlignedOperands {
+ uint64_t lhsCoefficient;
+ uint64_t rhsCoefficient;
+ int exponent;
+ };
+
+ MFBT_API explicit Decimal(double);
+ MFBT_API Decimal compareTo(const Decimal&) const;
+
+ static MFBT_API AlignedOperands alignOperands(const Decimal& lhs, const Decimal& rhs);
+ static inline Sign invertSign(Sign sign) { return sign == Negative ? Positive : Negative; }
+
+ Sign sign() const { return m_data.sign(); }
+
+ EncodedData m_data;
+};
+
+} // namespace blink
+
+namespace mozilla {
+typedef blink::Decimal Decimal;
+} // namespace mozilla
+
+#undef USING_FAST_MALLOC
+
+#ifdef DEFINED_ASSERT_FOR_DECIMAL_H
+#undef DEFINED_ASSERT_FOR_DECIMAL_H
+#undef ASSERT
+#endif
+
+#endif // Decimal_h