9310800761

Committed 31 May 2024 12:08AM UTC coverage: 82.732% (-0.01%) from 82.746%

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Merge pull request #1467 from evoskuil/master

Performance optimizations, style, comments.

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78.74

/src/chain/input.cpp

/**
 * Copyright (c) 2011-2023 libbitcoin developers (see AUTHORS)
 *
 * This file is part of libbitcoin.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <bitcoin/system/chain/input.hpp>

#include <algorithm>
#include <memory>
#include <utility>
#include <bitcoin/system/chain/context.hpp>
#include <bitcoin/system/chain/enums/magic_numbers.hpp>
#include <bitcoin/system/chain/point.hpp>
#include <bitcoin/system/chain/prevout.hpp>
#include <bitcoin/system/chain/script.hpp>
#include <bitcoin/system/chain/witness.hpp>
#include <bitcoin/system/define.hpp>
#include <bitcoin/system/math/math.hpp>
#include <bitcoin/system/stream/stream.hpp>

namespace libbitcoin {
namespace system {
namespace chain {

BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)

// Product overflows guarded by script size limit.
static_assert(max_script_size < 
    max_size_t / multisig_default_sigops / heavy_sigops_factor,
    "input sigop overflow guard");

// Constructors.
// ----------------------------------------------------------------------------

// Default point is null_hash and point::null_index. 
// Default metadata is spent, invalid, max_size_t value. 
input::input() NOEXCEPT
  : input(
      to_shared<chain::point>(),
      to_shared<chain::script>(),
      to_shared<chain::witness>(),
      0, false)
{
}

input::input(chain::point&& point, chain::script&& script,
    uint32_t sequence) NOEXCEPT
  : input(
      to_shared(std::move(point)),
      to_shared(std::move(script)),
      to_shared<chain::witness>(),
      sequence, true)
{
}

input::input(const chain::point& point, const chain::script& script,
    uint32_t sequence) NOEXCEPT
  : input(
      to_shared(point),
      to_shared(script),
      to_shared<chain::witness>(),
      sequence, true)
{
}

input::input(const chain::point::cptr& point,
    const chain::script::cptr& script, uint32_t sequence) NOEXCEPT
  : input(
      point ? point : to_shared<chain::point>(),
      script ? script : to_shared<chain::script>(),
      to_shared<chain::witness>(),
      sequence, true)
{
}

input::input(chain::point&& point, chain::script&& script,
    chain::witness&& witness, uint32_t sequence) NOEXCEPT
  : input(
      to_shared(std::move(point)),
      to_shared(std::move(script)),
      to_shared(std::move(witness)),
      sequence, true)
{
}

input::input(const chain::point& point, const chain::script& script,
    const chain::witness& witness, uint32_t sequence) NOEXCEPT
  : input(
      to_shared(point),
      to_shared(script),
      to_shared(witness),
      sequence, true)
{
}

input::input(const chain::point::cptr& point, const chain::script::cptr& script,
    const chain::witness::cptr& witness, uint32_t sequence) NOEXCEPT
  : input(point, script, witness, sequence, true)
{
}

input::input(const data_slice& data) NOEXCEPT
  : input(stream::in::copy(data))
{
}

////input::input(stream::in::fast&& stream) NOEXCEPT
////  : input(read::bytes::fast(stream))
////{
////}

input::input(stream::in::fast& stream) NOEXCEPT
  : input(read::bytes::fast(stream))
{
}

input::input(std::istream&& stream) NOEXCEPT
  : input(read::bytes::istream(stream))
{
}

input::input(std::istream& stream) NOEXCEPT
  : input(read::bytes::istream(stream))
{
}

input::input(reader&& source) NOEXCEPT
  : input(from_data(source))
{
}

input::input(reader& source) NOEXCEPT
  : input(from_data(source))
{
}

// protected
input::input(const chain::point::cptr& point, const chain::script::cptr& script,
    const chain::witness::cptr& witness, uint32_t sequence, bool valid) NOEXCEPT
  : point_(point),
    script_(script),
    witness_(witness),
    sequence_(sequence),
    valid_(valid)
{
}

// Operators.
// ----------------------------------------------------------------------------

bool input::operator==(const input& other) const NOEXCEPT
{
    return (sequence_ == other.sequence_)
        && (point_ == other.point_ || *point_ == *other.point_)
        && (script_ == other.script_ || *script_ == *other.script_)
        && (witness_ == other.witness_ || *witness_ == *other.witness_);
}

bool input::operator!=(const input& other) const NOEXCEPT
{
    return !(*this == other);
}

// Deserialization.
// ----------------------------------------------------------------------------

// static/private
input input::from_data(reader& source) NOEXCEPT
{
    // Witness is deserialized by transaction.
    return
    {
        to_shared<chain::point>(source),
        to_shared<chain::script>(source, true),
        to_shared<chain::witness>(),
        source.read_4_bytes_little_endian(),
        source
    };
}

// Serialization.
// ----------------------------------------------------------------------------

data_chunk input::to_data() const NOEXCEPT
{
    data_chunk data(serialized_size(false));
    stream::out::copy ostream(data);
    to_data(ostream);
    return data;
}

void input::to_data(std::ostream& stream) const NOEXCEPT
{
    write::bytes::ostream out(stream);
    to_data(out);
}

// Witness is serialized by transaction.
void input::to_data(writer& sink) const NOEXCEPT
{
    point_->to_data(sink);
    script_->to_data(sink, true);
    sink.write_4_bytes_little_endian(sequence_);
}

size_t input::serialized_size(bool witness) const NOEXCEPT
{
    // input.serialized_size(witness) provides sizing for witness, however
    // witnesses are serialized by the transaction. This is an ugly hack as a
    // consequence of bip144 not serializing witnesses as part of inputs, which
    // is logically the proper association.
    return point::serialized_size()
        + script_->serialized_size(true)
        + (witness ? witness_->serialized_size(true) : zero)
        + sizeof(sequence_);
}

// Properties.
// ----------------------------------------------------------------------------

bool input::is_valid() const NOEXCEPT
{
    return valid_;
}

const point& input::point() const NOEXCEPT
{
    return *point_;
}

const chain::script& input::script() const NOEXCEPT
{
    return *script_;
}

const chain::witness& input::witness() const NOEXCEPT
{
    return *witness_;
}

const point::cptr& input::point_ptr() const NOEXCEPT
{
    return point_;
}

const chain::script::cptr& input::script_ptr() const NOEXCEPT
{
    return script_;
}

const chain::witness::cptr& input::witness_ptr() const NOEXCEPT
{
    return witness_;
}

uint32_t input::sequence() const NOEXCEPT
{
    return sequence_;
}

// Methods.
// ----------------------------------------------------------------------------

bool input::is_final() const NOEXCEPT
{
    return sequence_ == max_input_sequence;
}

bool input::is_roller() const NOEXCEPT
{
    return script_->is_roller() || (prevout && prevout->script().is_roller());
}

// static
bool input::is_locked(uint32_t sequence, size_t height,
    uint32_t median_time_past, size_t prevout_height,
    uint32_t prevout_median_time_past) NOEXCEPT
{
    // BIP68: if bit 31 is set then no consensus meaning is applied.
    if (get_right(sequence, relative_locktime_disabled_bit))
        return false;

    // BIP68: the low 16 bits of the sequence apply to relative lock-time.
    const auto blocks = mask_left(sequence, relative_locktime_mask_left);

    // BIP68: bit 22 determines if relative lock is time or block based.
    if (get_right(sequence, relative_locktime_time_locked_bit))
    {
        // BIP68: change sequence to seconds by shift up by 9 bits (x 512).
        auto time = shift_left(blocks, relative_locktime_seconds_shift_left);
        auto age = floored_subtract(median_time_past, prevout_median_time_past);
        return age < time;
    }

    const auto age = floored_subtract(height, prevout_height);
    return age < blocks;
}

bool input::is_locked(size_t height, uint32_t median_time_past) const NOEXCEPT
{
    // Prevout must be found and height/median_time_past metadata populated.
    ////BC_ASSERT(!is_zero(metadata.height));
    return is_locked(sequence_, height, median_time_past, metadata.height,
        metadata.median_time_past);
}

bool input::reserved_hash(hash_digest& out) const NOEXCEPT
{
    if (!witness::is_reserved_pattern(witness_->stack()))
        return false;

    std::copy_n(witness_->stack().front()->begin(), hash_size, out.begin());
    return true;
}

// private
// prevout_script is only used to determine is_pay_script_hash_pattern.
bool input::extract_sigop_script(chain::script& out,
    const chain::script& prevout_script) const NOEXCEPT
{
    // There are no embedded sigops when the prevout script is not p2sh.
    if (!script::is_pay_script_hash_pattern(prevout_script.ops()))
        return false;

    // There are no embedded sigops when the input script is not push only.
    const auto& ops = script_->ops();
    if (ops.empty() || !script::is_relaxed_push_pattern(ops))
        return false;

    // Parse the embedded script from the last input script item (data).
    // This cannot fail because there is no prefix to invalidate the length.
    out = { ops.back().data(), false };
    return true;
}

// TODO: Prior to block 79400 sigops were limited only by policy.
// TODO: Create legacy sigops fork/flag and pass here, return 0 if false.
// TODO: this was an unbipped flag day soft fork, prior to BIP16/141.
// TODO: if (nHeight > 79400 && GetSigOpCount() > MAX_BLOCK_SIGOPS).
size_t input::signature_operations(bool bip16, bool bip141) const NOEXCEPT
{
    // Penalize quadratic signature operations (bip141).
    const auto factor = bip141 ? heavy_sigops_factor : one;
    const auto sigops = script_->signature_operations(false) * factor;

    // ************************************************************************
    // CONSENSUS: coinbase input cannot execute, but sigops are counted anyway.
    // ************************************************************************
    if (!prevout)
        return sigops;

    // Null prevout/input (coinbase) cannot have witness or embedded script.
    // Embedded/witness scripts are deserialized here and again on scipt eval.

    chain::script witness;
    if (bip141 && witness_->extract_sigop_script(witness, prevout->script()))
    {
        // Add sigops in the witness script (bip141).
        return ceilinged_add(sigops, witness.signature_operations(true));
    }

    chain::script embedded;
    if (bip16 && extract_sigop_script(embedded, prevout->script()))
    {
        if (bip141 && witness_->extract_sigop_script(witness, embedded))
        {
            // Add sigops in the embedded witness script (bip141).
            return ceilinged_add(sigops, witness.signature_operations(true));
        }
        else
        {
            // Add heavy sigops in the embedded script (bip16).
            return ceilinged_add(sigops, embedded.signature_operations(true) *
                factor);
        }
    }

    return sigops;
}

BC_POP_WARNING()

// JSON value convertors.
// ----------------------------------------------------------------------------

namespace json = boost::json;

// boost/json will soon have NOEXCEPT: github.com/boostorg/json/pull/636
BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)

input tag_invoke(json::value_to_tag<input>, const json::value& value) NOEXCEPT
{
    return
    {
        json::value_to<chain::point>(value.at("point")),
        json::value_to<chain::script>(value.at("script")),
        json::value_to<chain::witness>(value.at("witness")),
        value.at("sequence").to_number<uint32_t>()
    };
}

void tag_invoke(json::value_from_tag, json::value& value,
    const input& input) NOEXCEPT
{
    value =
    {
        { "point", input.point() },
        { "script", input.script() },
        { "witness", input.witness() },
        { "sequence", input.sequence() }
    };
}

BC_POP_WARNING()

input::cptr tag_invoke(json::value_to_tag<input::cptr>,
    const json::value& value) NOEXCEPT
{
    return to_shared(tag_invoke(json::value_to_tag<input>{}, value));
}

// Shared pointer overload is required for navigation.
BC_PUSH_WARNING(SMART_PTR_NOT_NEEDED)
BC_PUSH_WARNING(NO_VALUE_OR_CONST_REF_SHARED_PTR)

void tag_invoke(json::value_from_tag tag, json::value& value,
    const input::cptr& input) NOEXCEPT
{
    tag_invoke(tag, value, *input);
}

BC_POP_WARNING()
BC_POP_WARNING()

} // namespace chain
} // namespace system
} // namespace libbitcoin

1	/**
2	* Copyright (c) 2011-2023 libbitcoin developers (see AUTHORS)
3	*
4	* This file is part of libbitcoin.
5	*
6	* This program is free software: you can redistribute it and/or modify
7	* it under the terms of the GNU Affero General Public License as published by
8	* the Free Software Foundation, either version 3 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU Affero General Public License for more details.
15	*
16	* You should have received a copy of the GNU Affero General Public License
17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
18	*/
19	#include <bitcoin/system/chain/input.hpp>
20
21	#include <algorithm>
22	#include <memory>
23	#include <utility>
24	#include <bitcoin/system/chain/context.hpp>
25	#include <bitcoin/system/chain/enums/magic_numbers.hpp>
26	#include <bitcoin/system/chain/point.hpp>
27	#include <bitcoin/system/chain/prevout.hpp>
28	#include <bitcoin/system/chain/script.hpp>
29	#include <bitcoin/system/chain/witness.hpp>
30	#include <bitcoin/system/define.hpp>
31	#include <bitcoin/system/math/math.hpp>
32	#include <bitcoin/system/stream/stream.hpp>
33
34	namespace libbitcoin {
35	namespace system {
36	namespace chain {
37
38	BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
39
40	// Product overflows guarded by script size limit.
41	static_assert(max_script_size <
42	max_size_t / multisig_default_sigops / heavy_sigops_factor,
43	"input sigop overflow guard");
44
45	// Constructors.
46	// ----------------------------------------------------------------------------
47
48	// Default point is null_hash and point::null_index.
49	// Default metadata is spent, invalid, max_size_t value.
50	input::input() NOEXCEPT	22✔
51	: input(
52	to_shared<chain::point>(),	22✔
53	to_shared<chain::script>(),	22✔
54	to_shared<chain::witness>(),	22✔
55	0, false)	88✔
56	{
57	}	22✔
58
59	input::input(chain::point&& point, chain::script&& script,	73✔
60	uint32_t sequence) NOEXCEPT	73✔
61	: input(
62	to_shared(std::move(point)),	73✔
63	to_shared(std::move(script)),	73✔
64	to_shared<chain::witness>(),	73✔
65	sequence, true)	146✔
66	{
67	}	73✔
68
69	input::input(const chain::point& point, const chain::script& script,	734✔
70	uint32_t sequence) NOEXCEPT	734✔
71	: input(
72	to_shared(point),	734✔
73	to_shared(script),	734✔
74	to_shared<chain::witness>(),	734✔
75	sequence, true)	1,468✔
76	{
77	}	734✔
78
79	input::input(const chain::point::cptr& point,	×
80	const chain::script::cptr& script, uint32_t sequence) NOEXCEPT	×
81	: input(
82	point ? point : to_shared<chain::point>(),	×
83	script ? script : to_shared<chain::script>(),	×
84	to_shared<chain::witness>(),	×
85	sequence, true)	×
86	{
87	}	×
88
89	input::input(chain::point&& point, chain::script&& script,	11✔
90	chain::witness&& witness, uint32_t sequence) NOEXCEPT	11✔
91	: input(
92	to_shared(std::move(point)),	11✔
93	to_shared(std::move(script)),	11✔
94	to_shared(std::move(witness)),	11✔
95	sequence, true)	11✔
96	{
97	}	11✔
98
99	input::input(const chain::point& point, const chain::script& script,	1✔
100	const chain::witness& witness, uint32_t sequence) NOEXCEPT	1✔
101	: input(
102	to_shared(point),	1✔
103	to_shared(script),	1✔
104	to_shared(witness),	1✔
105	sequence, true)	1✔
106	{
107	}	1✔
108
109	input::input(const chain::point::cptr& point, const chain::script::cptr& script,	×
110	const chain::witness::cptr& witness, uint32_t sequence) NOEXCEPT	×
111	: input(point, script, witness, sequence, true)	×
112	{
113	}	×
114
115	input::input(const data_slice& data) NOEXCEPT	5✔
116	: input(stream::in::copy(data))	5✔
117	{
118	}	5✔
119
120	////input::input(stream::in::fast&& stream) NOEXCEPT
121	//// : input(read::bytes::fast(stream))
122	////{
123	////}
124
125	input::input(stream::in::fast& stream) NOEXCEPT	1✔
126	: input(read::bytes::fast(stream))	1✔
127	{
128	}	1✔
129
130	input::input(std::istream&& stream) NOEXCEPT	5✔
131	: input(read::bytes::istream(stream))	5✔
132	{
133	}	5✔
134
135	input::input(std::istream& stream) NOEXCEPT	3✔
136	: input(read::bytes::istream(stream))	3✔
137	{
138	}	3✔
139
140	input::input(reader&& source) NOEXCEPT	9✔
141	: input(from_data(source))	9✔
142	{
143	}	9✔
144
145	input::input(reader& source) NOEXCEPT	232✔
146	: input(from_data(source))	232✔
147	{
148	}	232✔
149
150	// protected
151	input::input(const chain::point::cptr& point, const chain::script::cptr& script,	1,082✔
152	const chain::witness::cptr& witness, uint32_t sequence, bool valid) NOEXCEPT	1,082✔
153	: point_(point),
154	script_(script),
155	witness_(witness),
156	sequence_(sequence),	1,082✔
157	valid_(valid)	1,082✔
158	{
159	}	1,082✔
160
161	// Operators.
162	// ----------------------------------------------------------------------------
163
164	bool input::operator==(const input& other) const NOEXCEPT	41✔
165	{
166	return (sequence_ == other.sequence_)	41✔
167	&& (point_ == other.point_ \|\| point_ == other.point_)	39✔
168	&& (script_ == other.script_ \|\| script_ == other.script_)	39✔
169	&& (witness_ == other.witness_ \|\| witness_ == other.witness_);	80✔
170	}
171
172	bool input::operator!=(const input& other) const NOEXCEPT	2✔
173	{
174	return !(*this == other);	2✔
175	}
176
177	// Deserialization.
178	// ----------------------------------------------------------------------------
179
180	// static/private
181	input input::from_data(reader& source) NOEXCEPT	241✔
182	{
183	// Witness is deserialized by transaction.
184	return	241✔
185	{
186	to_shared<chain::point>(source),	241✔
187	to_shared<chain::script>(source, true),	482✔
188	to_shared<chain::witness>(),	241✔
189	source.read_4_bytes_little_endian(),	241✔
190	source
191	};	482✔
192	}
193
194	// Serialization.
195	// ----------------------------------------------------------------------------
196
197	data_chunk input::to_data() const NOEXCEPT	1✔
198	{
199	data_chunk data(serialized_size(false));	1✔
200	stream::out::copy ostream(data);	1✔
201	to_data(ostream);	1✔
202	return data;	2✔
203	}	1✔
204
205	void input::to_data(std::ostream& stream) const NOEXCEPT	2✔
206	{
207	write::bytes::ostream out(stream);	2✔
208	to_data(out);	2✔
209	}	2✔
210
211	// Witness is serialized by transaction.
212	void input::to_data(writer& sink) const NOEXCEPT	1,384✔
213	{
214	point_->to_data(sink);	1,384✔
215	script_->to_data(sink, true);	1,384✔
216	sink.write_4_bytes_little_endian(sequence_);	1,384✔
217	}	1,384✔
218
219	size_t input::serialized_size(bool witness) const NOEXCEPT	82✔
220	{
221	// input.serialized_size(witness) provides sizing for witness, however
222	// witnesses are serialized by the transaction. This is an ugly hack as a
223	// consequence of bip144 not serializing witnesses as part of inputs, which
224	// is logically the proper association.
225	return point::serialized_size()	82✔
226	+ script_->serialized_size(true)	82✔
227	+ (witness ? witness_->serialized_size(true) : zero)	82✔
228	+ sizeof(sequence_);	82✔
229	}
230
231	// Properties.
232	// ----------------------------------------------------------------------------
233
234	bool input::is_valid() const NOEXCEPT	16✔
235	{
236	return valid_;	16✔
237	}
238
239	const point& input::point() const NOEXCEPT	153✔
240	{
241	return *point_;	10✔
242	}
243
244	const chain::script& input::script() const NOEXCEPT	72✔
245	{
246	return *script_;	10✔
247	}
248
249	const chain::witness& input::witness() const NOEXCEPT	1,800✔
250	{
251	return *witness_;	10✔
252	}
253
254	const point::cptr& input::point_ptr() const NOEXCEPT	×
255	{
256	return point_;	×
257	}
258
259	const chain::script::cptr& input::script_ptr() const NOEXCEPT	1,555✔
260	{
261	return script_;	1,555✔
262	}
263
264	const chain::witness::cptr& input::witness_ptr() const NOEXCEPT	×
265	{
266	return witness_;	×
267	}
268
269	uint32_t input::sequence() const NOEXCEPT	73✔
270	{
271	return sequence_;	10✔
272	}
273
274	// Methods.
275	// ----------------------------------------------------------------------------
276
277	bool input::is_final() const NOEXCEPT	22✔
278	{
279	return sequence_ == max_input_sequence;	22✔
280	}
281
282	bool input::is_roller() const NOEXCEPT	4✔
283	{
284	return script_->is_roller() \|\| (prevout && prevout->script().is_roller());	4✔
285	}
286
287	// static
288	bool input::is_locked(uint32_t sequence, size_t height,	10✔
289	uint32_t median_time_past, size_t prevout_height,
290	uint32_t prevout_median_time_past) NOEXCEPT
291	{
292	// BIP68: if bit 31 is set then no consensus meaning is applied.
293	if (get_right(sequence, relative_locktime_disabled_bit))	10✔
294	return false;
295
296	// BIP68: the low 16 bits of the sequence apply to relative lock-time.
297	const auto blocks = mask_left(sequence, relative_locktime_mask_left);	8✔
298
299	// BIP68: bit 22 determines if relative lock is time or block based.
300	if (get_right(sequence, relative_locktime_time_locked_bit))	8✔
301	{
302	// BIP68: change sequence to seconds by shift up by 9 bits (x 512).
303	auto time = shift_left(blocks, relative_locktime_seconds_shift_left);	3✔
304	auto age = floored_subtract(median_time_past, prevout_median_time_past);	3✔
305	return age < time;	3✔
306	}
307
308	const auto age = floored_subtract(height, prevout_height);	5✔
309	return age < blocks;	5✔
310	}
311
312	bool input::is_locked(size_t height, uint32_t median_time_past) const NOEXCEPT	10✔
313	{
314	// Prevout must be found and height/median_time_past metadata populated.
315	////BC_ASSERT(!is_zero(metadata.height));
316	return is_locked(sequence_, height, median_time_past, metadata.height,	10✔
317	metadata.median_time_past);	10✔
318	}
319
320	bool input::reserved_hash(hash_digest& out) const NOEXCEPT	×
321	{
322	if (!witness::is_reserved_pattern(witness_->stack()))	×
323	return false;
324
325	std::copy_n(witness_->stack().front()->begin(), hash_size, out.begin());	×
326	return true;	×
327	}
328
329	// private
330	// prevout_script is only used to determine is_pay_script_hash_pattern.
331	bool input::extract_sigop_script(chain::script& out,	×
332	const chain::script& prevout_script) const NOEXCEPT
333	{
334	// There are no embedded sigops when the prevout script is not p2sh.
335	if (!script::is_pay_script_hash_pattern(prevout_script.ops()))	×
336	return false;
337
338	// There are no embedded sigops when the input script is not push only.
339	const auto& ops = script_->ops();	×
NEW 340	if (ops.empty() \|\| !script::is_relaxed_push_pattern(ops))	×
341	return false;	×
342
343	// Parse the embedded script from the last input script item (data).
344	// This cannot fail because there is no prefix to invalidate the length.
345	out = { ops.back().data(), false };	×
346	return true;	×
347	}
348
349	// TODO: Prior to block 79400 sigops were limited only by policy.
350	// TODO: Create legacy sigops fork/flag and pass here, return 0 if false.
351	// TODO: this was an unbipped flag day soft fork, prior to BIP16/141.
352	// TODO: if (nHeight > 79400 && GetSigOpCount() > MAX_BLOCK_SIGOPS).
353	size_t input::signature_operations(bool bip16, bool bip141) const NOEXCEPT	7✔
354	{
355	// Penalize quadratic signature operations (bip141).
356	const auto factor = bip141 ? heavy_sigops_factor : one;	7✔
357	const auto sigops = script_->signature_operations(false) * factor;	7✔
358
359	// ************************************************************************
360	// CONSENSUS: coinbase input cannot execute, but sigops are counted anyway.
361	// ************************************************************************
362	if (!prevout)	7✔
363	return sigops;
364
365	// Null prevout/input (coinbase) cannot have witness or embedded script.
366	// Embedded/witness scripts are deserialized here and again on scipt eval.
367
368	chain::script witness;	×
369	if (bip141 && witness_->extract_sigop_script(witness, prevout->script()))	×
370	{
371	// Add sigops in the witness script (bip141).
372	return ceilinged_add(sigops, witness.signature_operations(true));	×
373	}
374
375	chain::script embedded;	×
376	if (bip16 && extract_sigop_script(embedded, prevout->script()))	×
377	{
378	if (bip141 && witness_->extract_sigop_script(witness, embedded))	×
379	{
380	// Add sigops in the embedded witness script (bip141).
381	return ceilinged_add(sigops, witness.signature_operations(true));	×
382	}
383	else
384	{
385	// Add heavy sigops in the embedded script (bip16).
386	return ceilinged_add(sigops, embedded.signature_operations(true) *	×
387	factor);
388	}
389	}
390
391	return sigops;
392	}	×
393
394	BC_POP_WARNING()
395
396	// JSON value convertors.
397	// ----------------------------------------------------------------------------
398
399	namespace json = boost::json;
400
401	// boost/json will soon have NOEXCEPT: github.com/boostorg/json/pull/636
402	BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
403
404	input tag_invoke(json::value_to_tag<input>, const json::value& value) NOEXCEPT	5✔
405	{
406	return	5✔
407	{
408	json::value_to<chain::point>(value.at("point")),	5✔
409	json::value_to<chain::script>(value.at("script")),	5✔
410	json::value_to<chain::witness>(value.at("witness")),	10✔
411	value.at("sequence").to_number<uint32_t>()	10✔
412	};	5✔
413	}
414
415	void tag_invoke(json::value_from_tag, json::value& value,	10✔
416	const input& input) NOEXCEPT
417	{
418	value =	10✔
419	{
420	{ "point", input.point() },
421	{ "script", input.script() },
422	{ "witness", input.witness() },
423	{ "sequence", input.sequence() }
424	};	10✔
425	}	10✔
426
427	BC_POP_WARNING()
428
429	input::cptr tag_invoke(json::value_to_tag<input::cptr>,	×
430	const json::value& value) NOEXCEPT
431	{
432	return to_shared(tag_invoke(json::value_to_tag<input>{}, value));	×
433	}
434
435	// Shared pointer overload is required for navigation.
436	BC_PUSH_WARNING(SMART_PTR_NOT_NEEDED)
437	BC_PUSH_WARNING(NO_VALUE_OR_CONST_REF_SHARED_PTR)
438
439	void tag_invoke(json::value_from_tag tag, json::value& value,	8✔
440	const input::cptr& input) NOEXCEPT
441	{
442	tag_invoke(tag, value, *input);	8✔
443	}	8✔
444
445	BC_POP_WARNING()
446	BC_POP_WARNING()
447
448	} // namespace chain
449	} // namespace system
450	} // namespace libbitcoin

libbitcoin / libbitcoin-system / 9310800761

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