Upgrade double-conversion to v3.0.0

This fixes their issue #41, a potential undefined behavior.

We preserve the locally added "__ghs" clause as well as the _M_ARM_FP
clause necessary for winrt in utils.h.

[ChangeLog][Third-Party Code] double-conversion got updated to upstream
version 3.0.0.

Task-number: QTBUG-66561
Change-Id: Id79125bdeeaebb61dca2e2885d3370accce9030c
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

10 files changed, 60 insertions, 42 deletions

diff --git a/src/3rdparty/double-conversion/bignum.cc b/src/3rdparty/double-conversion/bignum.cc
index 2743d67e8d..8892de8f2a 100644
--- a/src/3rdparty/double-conversion/bignum.cc
+++ b/src/3rdparty/double-conversion/bignum.cc
@@ -104,7 +104,7 @@ void Bignum::AssignDecimalString(Vector<const char> value) {
   const int kMaxUint64DecimalDigits = 19;
   Zero();
   int length = value.length();
-  int pos = 0;
+  unsigned int pos = 0;
   // Let's just say that each digit needs 4 bits.
   while (length >= kMaxUint64DecimalDigits) {
     uint64_t digits = ReadUInt64(value, pos, kMaxUint64DecimalDigits);
diff --git a/src/3rdparty/double-conversion/bignum.h b/src/3rdparty/double-conversion/bignum.h
index 5ec3544f57..c385f2237b 100644
--- a/src/3rdparty/double-conversion/bignum.h
+++ b/src/3rdparty/double-conversion/bignum.h
@@ -49,7 +49,6 @@ class Bignum {
 
   void AssignPowerUInt16(uint16_t base, int exponent);
 
-  void AddUInt16(uint16_t operand);
   void AddUInt64(uint64_t operand);
   void AddBignum(const Bignum& other);
   // Precondition: this >= other.
diff --git a/src/3rdparty/double-conversion/cached-powers.cc b/src/3rdparty/double-conversion/cached-powers.cc
index 9536f26927..2b43f06412 100644
--- a/src/3rdparty/double-conversion/cached-powers.cc
+++ b/src/3rdparty/double-conversion/cached-powers.cc
@@ -131,7 +131,6 @@ static const CachedPower kCachedPowers[] = {
   {UINT64_2PART_C(0xaf87023b, 9bf0ee6b), 1066, 340},
 };
 
-static const int kCachedPowersLength = ARRAY_SIZE(kCachedPowers);
 static const int kCachedPowersOffset = 348;  // -1 * the first decimal_exponent.
 static const double kD_1_LOG2_10 = 0.30102999566398114;  //  1 / lg(10)
 // Difference between the decimal exponents in the table above.
@@ -144,14 +143,12 @@ void PowersOfTenCache::GetCachedPowerForBinaryExponentRange(
     int max_exponent,
     DiyFp* power,
     int* decimal_exponent) {
-  (void)max_exponent; // Silence unused parameter warning in release builds
-  (void)kCachedPowersLength; // Silence unused parameter warning in release builds
   int kQ = DiyFp::kSignificandSize;
   double k = ceil((min_exponent + kQ - 1) * kD_1_LOG2_10);
   int foo = kCachedPowersOffset;
   int index =
       (foo + static_cast<int>(k) - 1) / kDecimalExponentDistance + 1;
-  ASSERT(0 <= index && index < kCachedPowersLength);
+  ASSERT(0 <= index && index < static_cast<int>(ARRAY_SIZE(kCachedPowers)));
   CachedPower cached_power = kCachedPowers[index];
   ASSERT(min_exponent <= cached_power.binary_exponent);
   (void) max_exponent;  // Mark variable as used.
diff --git a/src/3rdparty/double-conversion/diy-fp.h b/src/3rdparty/double-conversion/diy-fp.h
index 9dcf8fbdba..2edf34674e 100644
--- a/src/3rdparty/double-conversion/diy-fp.h
+++ b/src/3rdparty/double-conversion/diy-fp.h
@@ -42,7 +42,7 @@ class DiyFp {
   static const int kSignificandSize = 64;
 
   DiyFp() : f_(0), e_(0) {}
-  DiyFp(uint64_t f, int e) : f_(f), e_(e) {}
+  DiyFp(uint64_t significand, int exponent) : f_(significand), e_(exponent) {}
 
   // this = this - other.
   // The exponents of both numbers must be the same and the significand of this
@@ -76,22 +76,22 @@ class DiyFp {
 
   void Normalize() {
     ASSERT(f_ != 0);
-    uint64_t f = f_;
-    int e = e_;
+    uint64_t significand = f_;
+    int exponent = e_;
 
     // This method is mainly called for normalizing boundaries. In general
     // boundaries need to be shifted by 10 bits. We thus optimize for this case.
     const uint64_t k10MSBits = UINT64_2PART_C(0xFFC00000, 00000000);
-    while ((f & k10MSBits) == 0) {
-      f <<= 10;
-      e -= 10;
+    while ((significand & k10MSBits) == 0) {
+      significand <<= 10;
+      exponent -= 10;
     }
-    while ((f & kUint64MSB) == 0) {
-      f <<= 1;
-      e--;
+    while ((significand & kUint64MSB) == 0) {
+      significand <<= 1;
+      exponent--;
     }
-    f_ = f;
-    e_ = e;
+    f_ = significand;
+    e_ = exponent;
   }
 
   static DiyFp Normalize(const DiyFp& a) {
diff --git a/src/3rdparty/double-conversion/double-conversion.cc b/src/3rdparty/double-conversion/double-conversion.cc
index 909985be82..6f21a0124c 100644
--- a/src/3rdparty/double-conversion/double-conversion.cc
+++ b/src/3rdparty/double-conversion/double-conversion.cc
@@ -118,7 +118,7 @@ void DoubleToStringConverter::CreateDecimalRepresentation(
     StringBuilder* result_builder) const {
   // Create a representation that is padded with zeros if needed.
   if (decimal_point <= 0) {
-      // "0.00000decimal_rep".
+      // "0.00000decimal_rep" or "0.000decimal_rep00".
     result_builder->AddCharacter('0');
     if (digits_after_point > 0) {
       result_builder->AddCharacter('.');
@@ -129,7 +129,7 @@ void DoubleToStringConverter::CreateDecimalRepresentation(
       result_builder->AddPadding('0', remaining_digits);
     }
   } else if (decimal_point >= length) {
-    // "decimal_rep0000.00000" or "decimal_rep.0000"
+    // "decimal_rep0000.00000" or "decimal_rep.0000".
     result_builder->AddSubstring(decimal_digits, length);
     result_builder->AddPadding('0', decimal_point - length);
     if (digits_after_point > 0) {
@@ -137,7 +137,7 @@ void DoubleToStringConverter::CreateDecimalRepresentation(
       result_builder->AddPadding('0', digits_after_point);
     }
   } else {
-    // "decima.l_rep000"
+    // "decima.l_rep000".
     ASSERT(digits_after_point > 0);
     result_builder->AddSubstring(decimal_digits, decimal_point);
     result_builder->AddCharacter('.');
@@ -494,10 +494,17 @@ static double SignedZero(bool sign) {
 // because it constant-propagated the radix and concluded that the last
 // condition was always true. By moving it into a separate function the
 // compiler wouldn't warn anymore.
+#if _MSC_VER
+#pragma optimize("",off)
 static bool IsDecimalDigitForRadix(int c, int radix) {
   return '0' <= c && c <= '9' && (c - '0') < radix;
 }
-
+#pragma optimize("",on)
+#else
+static bool inline IsDecimalDigitForRadix(int c, int radix) {
+	return '0' <= c && c <= '9' && (c - '0') < radix;
+}
+#endif
 // Returns true if 'c' is a character digit that is valid for the given radix.
 // The 'a_character' should be 'a' or 'A'.
 //
@@ -852,9 +859,9 @@ double StringToDoubleConverter::StringToIeee(
         return junk_string_value_;
       }
     }
-    char sign = '+';
+    char exponen_sign = '+';
     if (*current == '+' || *current == '-') {
-      sign = static_cast<char>(*current);
+      exponen_sign = static_cast<char>(*current);
       ++current;
       if (current == end) {
         if (allow_trailing_junk) {
@@ -888,7 +895,7 @@ double StringToDoubleConverter::StringToIeee(
       ++current;
     } while (current != end && *current >= '0' && *current <= '9');
 
-    exponent += (sign == '-' ? -num : num);
+    exponent += (exponen_sign == '-' ? -num : num);
   }
 
   if (!(allow_trailing_spaces || allow_trailing_junk) && (current != end)) {
diff --git a/src/3rdparty/double-conversion/fixed-dtoa.cc b/src/3rdparty/double-conversion/fixed-dtoa.cc
index aef65fdc21..0f55a0b6eb 100644
--- a/src/3rdparty/double-conversion/fixed-dtoa.cc
+++ b/src/3rdparty/double-conversion/fixed-dtoa.cc
@@ -98,7 +98,7 @@ class UInt128 {
     return high_bits_ == 0 && low_bits_ == 0;
   }
 
-  int BitAt(int position) {
+  int BitAt(int position) const {
     if (position >= 64) {
       return static_cast<int>(high_bits_ >> (position - 64)) & 1;
     } else {
@@ -259,7 +259,8 @@ static void FillFractionals(uint64_t fractionals, int exponent,
       fractionals -= static_cast<uint64_t>(digit) << point;
     }
     // If the first bit after the point is set we have to round up.
-    if (((fractionals >> (point - 1)) & 1) == 1) {
+    ASSERT(fractionals == 0 || point - 1 >= 0);
+    if ((fractionals != 0) && ((fractionals >> (point - 1)) & 1) == 1) {
       RoundUp(buffer, length, decimal_point);
     }
   } else {  // We need 128 bits.
diff --git a/src/3rdparty/double-conversion/ieee.h b/src/3rdparty/double-conversion/ieee.h
index 661141d1a8..b14cf4f717 100644
--- a/src/3rdparty/double-conversion/ieee.h
+++ b/src/3rdparty/double-conversion/ieee.h
@@ -99,7 +99,7 @@ class Double {
   }
 
   double PreviousDouble() const {
-    if (d64_ == (kInfinity | kSignMask)) return -Double::Infinity();
+    if (d64_ == (kInfinity | kSignMask)) return -Infinity();
     if (Sign() < 0) {
       return Double(d64_ + 1).value();
     } else {
diff --git a/src/3rdparty/double-conversion/include/double-conversion/utils.h b/src/3rdparty/double-conversion/include/double-conversion/utils.h
index 20bfd36c84..ca7646d817 100644
--- a/src/3rdparty/double-conversion/include/double-conversion/utils.h
+++ b/src/3rdparty/double-conversion/include/double-conversion/utils.h
@@ -33,19 +33,29 @@
 
 #include <assert.h>
 #ifndef ASSERT
-# if defined(WINCE) || defined(_WIN32_WCE)
-#  define ASSERT(condition)
-# else
-#  define ASSERT(condition)         \
+#define ASSERT(condition)         \
     assert(condition);
-# endif
 #endif
 #ifndef UNIMPLEMENTED
-# define UNIMPLEMENTED() (exit(-1))
+#define UNIMPLEMENTED() (abort())
+#endif
+#ifndef DOUBLE_CONVERSION_NO_RETURN
+#ifdef _MSC_VER
+#define DOUBLE_CONVERSION_NO_RETURN __declspec(noreturn)
+#else
+#define DOUBLE_CONVERSION_NO_RETURN __attribute__((noreturn))
+#endif
 #endif
 #ifndef UNREACHABLE
-# define UNREACHABLE()   (exit(-1))
+#ifdef _MSC_VER
+void DOUBLE_CONVERSION_NO_RETURN abort_noreturn();
+inline void abort_noreturn() { abort(); }
+#define UNREACHABLE()   (abort_noreturn())
+#else
+#define UNREACHABLE()   (abort())
 #endif
+#endif
+
 
 // Double operations detection based on target architecture.
 // Linux uses a 80bit wide floating point stack on x86. This induces double
@@ -62,11 +72,15 @@
     defined(__hppa__) || defined(__ia64__) || \
     defined(__mips__) || \
     defined(__powerpc__) || defined(__ppc__) || defined(__ppc64__) || \
+    defined(_POWER) || defined(_ARCH_PPC) || defined(_ARCH_PPC64) || \
     defined(__sparc__) || defined(__sparc) || defined(__s390__) || \
     defined(__SH4__) || defined(__alpha__) || \
     defined(_MIPS_ARCH_MIPS32R2) || \
-    defined(__AARCH64EL__)
+    defined(__AARCH64EL__) || defined(__aarch64__) || \
+    defined(__riscv)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
+#elif defined(__mc68000__)
+#undef DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS
 #elif defined(_M_IX86) || defined(__i386__) || defined(__i386)
 #if defined(_WIN32)
 // Windows uses a 64bit wide floating point stack.
@@ -172,8 +186,8 @@ template <typename T>
 class Vector {
  public:
   Vector() : start_(NULL), length_(0) {}
-  Vector(T* data, int length) : start_(data), length_(length) {
-    ASSERT(length == 0 || (length > 0 && data != NULL));
+  Vector(T* data, int len) : start_(data), length_(len) {
+    ASSERT(len == 0 || (len > 0 && data != NULL));
   }
 
   // Returns a vector using the same backing storage as this one,
@@ -215,8 +229,8 @@ class Vector {
 // buffer bounds on all operations in debug mode.
 class StringBuilder {
  public:
-  StringBuilder(char* buffer, int size)
-      : buffer_(buffer, size), position_(0) { }
+  StringBuilder(char* buffer, int buffer_size)
+      : buffer_(buffer, buffer_size), position_(0) { }
 
   ~StringBuilder() { if (!is_finalized()) Finalize(); }
 
diff --git a/src/3rdparty/double-conversion/qt_attribution.json b/src/3rdparty/double-conversion/qt_attribution.json
index 92118ac779..d41a7ef332 100644
--- a/src/3rdparty/double-conversion/qt_attribution.json
+++ b/src/3rdparty/double-conversion/qt_attribution.json
@@ -5,8 +5,8 @@
     "QtUsage": "Used in Qt Core. Configure with -system-doubleconversion or -no-doubleconversion to avoid.",
 
     "Homepage": "https://github.com/google/double-conversion",
-    "Version": "2.0.1",
-    "DownloadLocation": "https://github.com/google/double-conversion/commit/2fb03de56faa32bbba5e02222528e7b760f71d77",
+    "Version": "3.0.0",
+    "DownloadLocation": "https://github.com/google/double-conversion/commit/ca220cbafa83ca706f028bfbb5adc7eb2f1f90e1",
     "License": "BSD 3-clause \"New\" or \"Revised\" License",
     "LicenseId": "BSD-3-Clause",
     "LicenseFile": "LICENSE",
diff --git a/src/3rdparty/double-conversion/strtod.cc b/src/3rdparty/double-conversion/strtod.cc
index 34717562bd..17abcbb2a5 100644
--- a/src/3rdparty/double-conversion/strtod.cc
+++ b/src/3rdparty/double-conversion/strtod.cc
@@ -286,7 +286,7 @@ static bool DiyFpStrtod(Vector<const char> buffer,
   const int kDenominator = 1 << kDenominatorLog;
   // Move the remaining decimals into the exponent.
   exponent += remaining_decimals;
-  int error = (remaining_decimals == 0 ? 0 : kDenominator / 2);
+  uint64_t error = (remaining_decimals == 0 ? 0 : kDenominator / 2);
 
   int old_e = input.e();
   input.Normalize();