Remove support for double serialization

src/Makefile.am

@@ -265,7 +265,6 @@ BITCOIN_CORE_H = \
   util/tokenpipe.h \
   util/trace.h \
   util/translation.h \
-  util/types.h \
   util/ui_change_type.h \
   util/url.h \
   util/vector.h \

src/compat/assumptions.h

@@ -36,11 +36,6 @@ static_assert(std::numeric_limits<double>::is_iec559, "IEEE 754 double assumed")
 // Example(s): Everywhere :-)
 static_assert(std::numeric_limits<unsigned char>::digits == 8, "8-bit byte assumed");
 
-// Assumption: We assume floating-point widths.
-// Example(s): Type punning in serialization code (ser_{float,double}_to_uint{32,64}).
-static_assert(sizeof(float) == 4, "32-bit float assumed");
-static_assert(sizeof(double) == 8, "64-bit double assumed");
-
 // Assumption: We assume integer widths.
 // Example(s): GetSizeOfCompactSize and WriteCompactSize in the serialization
 //             code.

src/serialize.h

@@ -23,7 +23,6 @@
 
 #include <prevector.h>
 #include <span.h>
-#include <util/types.h>
 
 /**
  * The maximum size of a serialized object in bytes or number of elements
@@ -123,20 +122,6 @@ template<typename Stream> inline uint64_t ser_readdata64(Stream &s)
     s.read((char*)&obj, 8);
     return le64toh(obj);
 }
-inline uint64_t ser_double_to_uint64(double x)
-{
-    uint64_t tmp;
-    std::memcpy(&tmp, &x, sizeof(x));
-    static_assert(sizeof(tmp) == sizeof(x), "double and uint64_t assumed to have the same size");
-    return tmp;
-}
-inline double ser_uint64_to_double(uint64_t y)
-{
-    double tmp;
-    std::memcpy(&tmp, &y, sizeof(y));
-    static_assert(sizeof(tmp) == sizeof(y), "double and uint64_t assumed to have the same size");
-    return tmp;
-}
 
 
 /////////////////////////////////////////////////////////////////
@@ -221,8 +206,6 @@ template<typename Stream> inline void Serialize(Stream& s, int32_t a ) { ser_wri
 template<typename Stream> inline void Serialize(Stream& s, uint32_t a) { ser_writedata32(s, a); }
 template<typename Stream> inline void Serialize(Stream& s, int64_t a ) { ser_writedata64(s, a); }
 template<typename Stream> inline void Serialize(Stream& s, uint64_t a) { ser_writedata64(s, a); }
-template<typename Stream> inline void Serialize(Stream& s, float a   ) { static_assert(ALWAYS_FALSE<Stream>, "Not implemented"); }
-template<typename Stream> inline void Serialize(Stream& s, double a  ) { ser_writedata64(s, ser_double_to_uint64(a)); }
 template<typename Stream, int N> inline void Serialize(Stream& s, const char (&a)[N]) { s.write(a, N); }
 template<typename Stream, int N> inline void Serialize(Stream& s, const unsigned char (&a)[N]) { s.write(CharCast(a), N); }
 template<typename Stream> inline void Serialize(Stream& s, const Span<const unsigned char>& span) { s.write(CharCast(span.data()), span.size()); }
@@ -239,8 +222,6 @@ template<typename Stream> inline void Unserialize(Stream& s, int32_t& a ) { a =
 template<typename Stream> inline void Unserialize(Stream& s, uint32_t& a) { a = ser_readdata32(s); }
 template<typename Stream> inline void Unserialize(Stream& s, int64_t& a ) { a = ser_readdata64(s); }
 template<typename Stream> inline void Unserialize(Stream& s, uint64_t& a) { a = ser_readdata64(s); }
-template<typename Stream> inline void Unserialize(Stream& s, float& a   ) { static_assert(ALWAYS_FALSE<Stream>, "Not implemented"); }
-template<typename Stream> inline void Unserialize(Stream& s, double& a  ) { a = ser_uint64_to_double(ser_readdata64(s)); }
 template<typename Stream, int N> inline void Unserialize(Stream& s, char (&a)[N]) { s.read(a, N); }
 template<typename Stream, int N> inline void Unserialize(Stream& s, unsigned char (&a)[N]) { s.read(CharCast(a), N); }
 template<typename Stream> inline void Unserialize(Stream& s, Span<unsigned char>& span) { s.read(CharCast(span.data()), span.size()); }

src/test/fuzz/float.cpp

@@ -3,15 +3,12 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <memusage.h>
-#include <serialize.h>
-#include <streams.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <util/serfloat.h>
 #include <version.h>
 
 #include <cassert>
-#include <cstdint>
 #include <cmath>
 #include <limits>
 

src/test/fuzz/util.h

@@ -513,7 +513,6 @@ void WriteToStream(FuzzedDataProvider& fuzzed_data_provider, Stream& stream) noe
                 WRITE_TO_STREAM_CASE(uint32_t, fuzzed_data_provider.ConsumeIntegral<uint32_t>()),
                 WRITE_TO_STREAM_CASE(int64_t, fuzzed_data_provider.ConsumeIntegral<int64_t>()),
                 WRITE_TO_STREAM_CASE(uint64_t, fuzzed_data_provider.ConsumeIntegral<uint64_t>()),
-                WRITE_TO_STREAM_CASE(double, fuzzed_data_provider.ConsumeFloatingPoint<double>()),
                 WRITE_TO_STREAM_CASE(std::string, fuzzed_data_provider.ConsumeRandomLengthString(32)),
                 WRITE_TO_STREAM_CASE(std::vector<char>, ConsumeRandomLengthIntegralVector<char>(fuzzed_data_provider)));
         } catch (const std::ios_base::failure&) {
@@ -544,7 +543,6 @@ void ReadFromStream(FuzzedDataProvider& fuzzed_data_provider, Stream& stream) no
                 READ_FROM_STREAM_CASE(uint32_t),
                 READ_FROM_STREAM_CASE(int64_t),
                 READ_FROM_STREAM_CASE(uint64_t),
-                READ_FROM_STREAM_CASE(double),
                 READ_FROM_STREAM_CASE(std::string),
                 READ_FROM_STREAM_CASE(std::vector<char>));
         } catch (const std::ios_base::failure&) {

src/test/serialize_tests.cpp

@@ -70,7 +70,6 @@ BOOST_AUTO_TEST_CASE(sizes)
     BOOST_CHECK_EQUAL(sizeof(uint32_t), GetSerializeSize(uint32_t(0), 0));
     BOOST_CHECK_EQUAL(sizeof(int64_t), GetSerializeSize(int64_t(0), 0));
     BOOST_CHECK_EQUAL(sizeof(uint64_t), GetSerializeSize(uint64_t(0), 0));
-    BOOST_CHECK_EQUAL(sizeof(double), GetSerializeSize(double(0), 0));
     // Bool is serialized as char
     BOOST_CHECK_EQUAL(sizeof(char), GetSerializeSize(bool(0), 0));
 
@@ -84,7 +83,6 @@ BOOST_AUTO_TEST_CASE(sizes)
     BOOST_CHECK_EQUAL(GetSerializeSize(uint32_t(0), 0), 4U);
     BOOST_CHECK_EQUAL(GetSerializeSize(int64_t(0), 0), 8U);
     BOOST_CHECK_EQUAL(GetSerializeSize(uint64_t(0), 0), 8U);
-    BOOST_CHECK_EQUAL(GetSerializeSize(double(0), 0), 8U);
     BOOST_CHECK_EQUAL(GetSerializeSize(bool(0), 0), 1U);
 }
 

src/util/types.h

@@ -1,11 +0,0 @@
-// Copyright (c) 2021 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-#ifndef BITCOIN_UTIL_TYPES_H
-#define BITCOIN_UTIL_TYPES_H
-
-template <class>
-inline constexpr bool ALWAYS_FALSE{false};
-
-#endif // BITCOIN_UTIL_TYPES_H