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Merge pull request libbitcoin#1500 from evoskuil/master
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Avoid unnecessary witness initializations, style, comments.
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@evoskuil
evoskuil authored Jul 16, 2024
2 parents f04a282 + 95a49e2 commit 8a74134
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Showing 4 changed files with 83 additions and 55 deletions.
15 changes: 14 additions & 1 deletion include/bitcoin/system/chain/input.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -130,12 +130,25 @@ class BC_API input
size_t witnessed_size() const NOEXCEPT;
void set_witness(reader& source) NOEXCEPT;

inline const chain::witness& get_witness() const NOEXCEPT
{
return witness_ ? *witness_ : no_witness();
}

inline const chain::witness::cptr& get_witness_cptr() const NOEXCEPT
{
return witness_ ? witness_ : no_witness_cptr();
}

typedef struct { size_t nominal; size_t witnessed; } sizes;

void assign_data(reader& source) NOEXCEPT;
////void assign_data(reader& source) NOEXCEPT;
////static input from_data(reader& source) NOEXCEPT;
static sizes serialized_size(const chain::script& script) NOEXCEPT;
static sizes serialized_size(const chain::script& script,
const chain::witness& witness) NOEXCEPT;
static const chain::witness& no_witness() NOEXCEPT;
static const chain::witness::cptr& no_witness_cptr() NOEXCEPT;
bool extract_sigop_script(chain::script& out,
const chain::script& prevout_script) const NOEXCEPT;

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95 changes: 62 additions & 33 deletions src/chain/input.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,25 @@ static_assert(max_script_size <
max_size_t / multisig_default_sigops / heavy_sigops_factor,
"input sigop overflow guard");

// static/private
const witness& input::no_witness() NOEXCEPT
{
static const chain::witness empty_witness{};
return empty_witness;
}

// static/private
const witness::cptr& input::no_witness_cptr() NOEXCEPT
{
BC_PUSH_WARNING(NO_NEW_OR_DELETE)
static const std::shared_ptr<const chain::witness> empty
{
new const chain::witness{}
};
BC_POP_WARNING()
return empty;
}

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

Expand Down Expand Up @@ -151,12 +170,10 @@ input::input(reader& source) NOEXCEPT
script_(
source.get_allocator().new_object<chain::script>(source, true),
source.get_allocator().deleter<chain::script>(source.get_arena())),
witness_(
source.get_allocator().new_object<chain::witness>(/*empty*/),
source.get_allocator().deleter<chain::witness>(source.get_arena())),
witness_(nullptr),
sequence_(source.read_4_bytes_little_endian()),
valid_(source),
size_(serialized_size(*script_, *witness_))
size_(serialized_size(*script_))
{
////assign_data(source);
}
Expand All @@ -181,7 +198,7 @@ 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_);
&& (witness_ == other.witness_ || get_witness() == other.get_witness());
}

bool input::operator!=(const input& other) const NOEXCEPT
Expand All @@ -206,28 +223,26 @@ bool input::operator!=(const input& other) const NOEXCEPT
//// };
////}

// private
void input::assign_data(reader&) NOEXCEPT
{
////auto& allocator = source.get_allocator();
////
////allocator.construct<chain::point::cptr>(&point_,
//// allocator.new_object<chain::point>(source),
//// allocator.deleter<chain::point>(source.get_arena()));
////
////allocator.construct<chain::script::cptr>(&script_,
//// allocator.new_object<chain::script>(source, true),
//// allocator.deleter<chain::script>(source.get_arena()));
////
////// Witness is deserialized and assigned by transaction.
////allocator.construct<chain::witness::cptr>(&witness_,
//// allocator.new_object<chain::witness>(/*empty*/),
//// allocator.deleter<chain::witness>(source.get_arena()));
////
////sequence_ = source.read_4_bytes_little_endian();
////size_ = serialized_size(*script_, *witness_);
////valid_ = source;
}
////// private
////void input::assign_data(reader& source) NOEXCEPT
////{
//// auto& allocator = source.get_allocator();
////
//// allocator.construct<chain::point::cptr>(&point_,
//// allocator.new_object<chain::point>(source),
//// allocator.deleter<chain::point>(source.get_arena()));
////
//// allocator.construct<chain::script::cptr>(&script_,
//// allocator.new_object<chain::script>(source, true),
//// allocator.deleter<chain::script>(source.get_arena()));
////
//// // Witness is deserialized and assigned by transaction.
//// allocator.construct<chain::witness::cptr>(&witness_, nullptr);
////
//// sequence_ = source.read_4_bytes_little_endian();
//// size_ = serialized_size(*script_);
//// valid_ = source;
////}

// Serialization.
// ----------------------------------------------------------------------------
Expand All @@ -254,6 +269,20 @@ void input::to_data(writer& sink) const NOEXCEPT
sink.write_4_bytes_little_endian(sequence_);
}

// static/private
input::sizes input::serialized_size(const chain::script& script) NOEXCEPT
{
constexpr auto const_size = ceilinged_add(
point::serialized_size(),
sizeof(sequence_));

const auto nominal_size = ceilinged_add(
const_size,
script.serialized_size(true));

return { nominal_size, zero };
}

// static/private
input::sizes input::serialized_size(const chain::script& script,
const chain::witness& witness) NOEXCEPT
Expand Down Expand Up @@ -334,7 +363,7 @@ const chain::script& input::script() const NOEXCEPT

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

const point::cptr& input::point_ptr() const NOEXCEPT
Expand All @@ -349,7 +378,7 @@ const chain::script::cptr& input::script_ptr() const NOEXCEPT

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

uint32_t input::sequence() const NOEXCEPT
Expand Down Expand Up @@ -405,10 +434,10 @@ bool input::is_locked(size_t height, uint32_t median_time_past) const NOEXCEPT

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

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

Expand Down Expand Up @@ -452,7 +481,7 @@ size_t input::signature_operations(bool bip16, bool bip141) const NOEXCEPT
// Embedded/witness scripts are deserialized here and again on scipt eval.

chain::script witness;
if (bip141 && witness_->extract_sigop_script(witness, prevout->script()))
if (bip141 && get_witness().extract_sigop_script(witness, prevout->script()))
{
// Add sigops in the witness script (bip141).
return ceilinged_add(sigops, witness.signature_operations(true));
Expand All @@ -461,7 +490,7 @@ size_t input::signature_operations(bool bip16, bool bip141) const NOEXCEPT
chain::script embedded;
if (bip16 && extract_sigop_script(embedded, prevout->script()))
{
if (bip141 && witness_->extract_sigop_script(witness, embedded))
if (bip141 && get_witness().extract_sigop_script(witness, embedded))
{
// Add sigops in the embedded witness script (bip141).
return ceilinged_add(sigops, witness.signature_operations(true));
Expand Down
6 changes: 3 additions & 3 deletions src/chain/operation.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -39,14 +39,14 @@ BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
// Gotta set something when invalid minimal result, test is_valid.
static constexpr auto any_invalid = opcode::op_xor;

// static
// static/private
const data_chunk& operation::no_data() NOEXCEPT
{
static const data_chunk empty_data{};
return empty_data;
}

// static
// static/private
const chunk_cptr& operation::no_data_cptr() NOEXCEPT
{
BC_PUSH_WARNING(NO_NEW_OR_DELETE)
Expand All @@ -58,7 +58,7 @@ const chunk_cptr& operation::no_data_cptr() NOEXCEPT
return empty;
}

// static
// static/private
// Push data is not possible with an invalid code, combination is invalid.
const chunk_cptr& operation::any_data_cptr() NOEXCEPT
{
Expand Down
22 changes: 4 additions & 18 deletions src/chain/transaction.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -98,21 +98,12 @@ transaction::transaction(const transaction& other) NOEXCEPT
other.valid_)
{
// Optimized for faster optional, not for copy.

if (other.nominal_hash_)
nominal_hash_ = to_unique(*other.nominal_hash_);
else
nominal_hash_.reset();

if (other.witness_hash_)
witness_hash_ = to_unique(*other.witness_hash_);
else
witness_hash_.reset();

if (other.sighash_cache_)
sighash_cache_ = to_unique(*other.sighash_cache_);
else
sighash_cache_.reset();
}

transaction::transaction(uint32_t version, chain::inputs&& inputs,
Expand Down Expand Up @@ -211,22 +202,17 @@ transaction& transaction::operator=(const transaction& other) NOEXCEPT
valid_ = other.valid_;
size_ = other.size_;

// Optimized for faster optional, not for copy.
nominal_hash_.reset();
witness_hash_.reset();
sighash_cache_.reset();

// Optimized for faster optional, not for copy.
if (other.nominal_hash_)
nominal_hash_ = to_unique(*other.nominal_hash_);
else
nominal_hash_.reset();

if (other.witness_hash_)
witness_hash_ = to_unique(*other.witness_hash_);
else
witness_hash_.reset();

if (other.sighash_cache_)
sighash_cache_ = to_unique(*other.sighash_cache_);
else
sighash_cache_.reset();

return *this;
}
Expand Down

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