Refactor names to remove flag/fork ambiguities.

Makefile.am

@@ -418,6 +418,7 @@ include_bitcoin_system_HEADERS = \
     include/bitcoin/system/constraints.hpp \
     include/bitcoin/system/define.hpp \
     include/bitcoin/system/exceptions.hpp \
+    include/bitcoin/system/forks.hpp \
     include/bitcoin/system/funclets.hpp \
     include/bitcoin/system/have.hpp \
     include/bitcoin/system/literals.hpp \
@@ -449,7 +450,7 @@ include_bitcoin_system_chain_HEADERS = \
 include_bitcoin_system_chain_enumsdir = ${includedir}/bitcoin/system/chain/enums
 include_bitcoin_system_chain_enums_HEADERS = \
     include/bitcoin/system/chain/enums/coverage.hpp \
-    include/bitcoin/system/chain/enums/forks.hpp \
+    include/bitcoin/system/chain/enums/flags.hpp \
     include/bitcoin/system/chain/enums/magic_numbers.hpp \
     include/bitcoin/system/chain/enums/numbers.hpp \
     include/bitcoin/system/chain/enums/opcode.hpp \

builds/msvc/vs2022/libbitcoin-system/libbitcoin-system.vcxproj

@@ -252,7 +252,7 @@
     <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\compact.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\context.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\coverage.hpp" />
-    <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\forks.hpp" />
+    <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\flags.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\magic_numbers.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\numbers.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\opcode.hpp" />
@@ -332,6 +332,7 @@
     <ClInclude Include="..\..\..\..\include\bitcoin\system\error\script_error_t.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\error\transaction_error_t.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\exceptions.hpp" />
+    <ClInclude Include="..\..\..\..\include\bitcoin\system\forks.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\funclets.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\hash\accumulator.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\system\hash\algorithm.hpp" />

builds/msvc/vs2022/libbitcoin-system/libbitcoin-system.vcxproj.filters

@@ -635,7 +635,7 @@
     <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\coverage.hpp">
       <Filter>include\bitcoin\system\chain\enums</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\forks.hpp">
+    <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\flags.hpp">
       <Filter>include\bitcoin\system\chain\enums</Filter>
     </ClInclude>
     <ClInclude Include="..\..\..\..\include\bitcoin\system\chain\enums\magic_numbers.hpp">
@@ -875,6 +875,9 @@
     <ClInclude Include="..\..\..\..\include\bitcoin\system\exceptions.hpp">
       <Filter>include\bitcoin\system</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\include\bitcoin\system\forks.hpp">
+      <Filter>include\bitcoin\system</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\include\bitcoin\system\funclets.hpp">
       <Filter>include\bitcoin\system</Filter>
     </ClInclude>

include/bitcoin/system.hpp

@@ -19,6 +19,7 @@
 #include <bitcoin/system/constraints.hpp>
 #include <bitcoin/system/define.hpp>
 #include <bitcoin/system/exceptions.hpp>
+#include <bitcoin/system/forks.hpp>
 #include <bitcoin/system/funclets.hpp>
 #include <bitcoin/system/have.hpp>
 #include <bitcoin/system/literals.hpp>
@@ -44,7 +45,7 @@
 #include <bitcoin/system/chain/transaction.hpp>
 #include <bitcoin/system/chain/witness.hpp>
 #include <bitcoin/system/chain/enums/coverage.hpp>
-#include <bitcoin/system/chain/enums/forks.hpp>
+#include <bitcoin/system/chain/enums/flags.hpp>
 #include <bitcoin/system/chain/enums/magic_numbers.hpp>
 #include <bitcoin/system/chain/enums/numbers.hpp>
 #include <bitcoin/system/chain/enums/opcode.hpp>

include/bitcoin/system/chain/chain.hpp

@@ -26,7 +26,7 @@
 #include <bitcoin/system/chain/compact.hpp>
 #include <bitcoin/system/chain/context.hpp>
 #include <bitcoin/system/chain/enums/coverage.hpp>
-#include <bitcoin/system/chain/enums/forks.hpp>
+#include <bitcoin/system/chain/enums/flags.hpp>
 #include <bitcoin/system/chain/enums/magic_numbers.hpp>
 #include <bitcoin/system/chain/enums/numbers.hpp>
 #include <bitcoin/system/chain/enums/opcode.hpp>

include/bitcoin/system/chain/chain_state.hpp

@@ -19,12 +19,13 @@
 #ifndef LIBBITCOIN_SYSTEM_CHAIN_CHAIN_STATE_HPP
 #define LIBBITCOIN_SYSTEM_CHAIN_CHAIN_STATE_HPP
 
-#include <memory>
 #include <deque>
+#include <memory>
 #include <bitcoin/system/chain/checkpoint.hpp>
 #include <bitcoin/system/chain/context.hpp>
-#include <bitcoin/system/chain/enums/forks.hpp>
+#include <bitcoin/system/chain/enums/flags.hpp>
 #include <bitcoin/system/define.hpp>
+#include <bitcoin/system/forks.hpp>
 #include <bitcoin/system/hash/hash.hpp>
 #include <bitcoin/system/math/math.hpp>
 
@@ -38,6 +39,8 @@ namespace chain {
 class block;
 class header;
 
+/// system::settings are using within chain_state to compute context, but are
+/// not used directly within chain classes, which would be an abstraction leak.
 class BC_API chain_state
 {
 public:
@@ -48,29 +51,6 @@ class BC_API chain_state
     typedef std::deque<uint32_t> timestamps;
     typedef std::shared_ptr<chain_state> ptr;
     typedef struct { size_t count; size_t high; } range;
-    typedef struct
-    {
-        bool bip16;
-        bool bip30;
-        bool bip30_deactivate;
-        bool bip30_reactivate;
-        bool bip34;
-        bool bip42;
-        bool bip65;
-        bool bip66;
-        bool bip68;
-        bool bip90;
-        bool bip112;
-        bool bip113;
-        bool bip141;
-        bool bip143;
-        bool bip147;
-        bool retarget;                // !regtest
-        bool difficult;               // !testnet
-        bool time_warp_patch;         // litecoin
-        bool retarget_overflow_patch; // litecoin
-        bool scrypt_proof_of_work;    // litecoin
-    } forks_t;
 
     /// Heights used to identify construction requirements.
     /// All values are lower-bounded by the genesis block height.
@@ -224,23 +204,23 @@ class BC_API chain_state
 
     /// No failure sentinel.
     static activations activation(const data& values,
-        const forks_t& forks, const system::settings& settings) NOEXCEPT;
+        const forks& forks, const system::settings& settings) NOEXCEPT;
 
     /// Returns zero if data is invalid.
     static uint32_t median_time_past(const data& values,
-        const forks_t& forks) NOEXCEPT;
+        const forks& forks) NOEXCEPT;
 
     /// Returns zero if data is invalid.
     static uint32_t work_required(const data& values,
-        const forks_t& forks, const system::settings& settings) NOEXCEPT;
+        const forks& forks, const system::settings& settings) NOEXCEPT;
 
 private:
-    static size_t bits_count(size_t height, const forks_t& forks,
+    static size_t bits_count(size_t height, const forks& forks,
         size_t retargeting_interval) NOEXCEPT;
-    static size_t version_count(size_t height, const forks_t& forks,
+    static size_t version_count(size_t height, const forks& forks,
         size_t bip34_activation_sample) NOEXCEPT;
-    static size_t timestamp_count(size_t height, const forks_t& forks) NOEXCEPT;
-    static size_t retarget_height(size_t height, const forks_t& forks,
+    static size_t timestamp_count(size_t height, const forks& forks) NOEXCEPT;
+    static size_t retarget_height(size_t height, const forks& forks,
         size_t retargeting_interval) NOEXCEPT;
 
     static size_t bip30_deactivate_height(size_t height,
@@ -258,7 +238,7 @@ class BC_API chain_state
         const system::settings& settings) NOEXCEPT;
 
     static uint32_t work_required_retarget(const data& values,
-        const forks_t& forks, uint32_t proof_of_work_limit,
+        const forks& forks, uint32_t proof_of_work_limit,
         uint32_t minimum_timespan, uint32_t maximum_timespan,
         uint32_t retargeting_interval_seconds) NOEXCEPT;
     static uint32_t retarget_timespan(const data& values,
@@ -269,7 +249,7 @@ class BC_API chain_state
 
     // These are thread safe.
     const data data_;
-    const forks_t& forks_;
+    const forks& forks_;
     const activations activations_;
     const uint32_t work_required_;
     const uint32_t median_time_past_;

include/bitcoin/system/chain/context.hpp

@@ -20,7 +20,7 @@
 #define LIBBITCOIN_SYSTEM_CHAIN_CONTEXT_HPP
 
 #include <bitcoin/system/define.hpp>
-#include <bitcoin/system/chain/enums/forks.hpp>
+#include <bitcoin/system/chain/enums/flags.hpp>
 #include <bitcoin/system/chain/enums/policy.hpp>
 
 namespace libbitcoin {
@@ -30,8 +30,8 @@ namespace chain {
 class BC_API context final
 {
 public:
-    /// Determine if the fork is active for this block.
-    bool is_enabled(chain::forks fork) const NOEXCEPT;
+    /// Determine if the flag is active for this block.
+    bool is_enabled(chain::flags flag) const NOEXCEPT;
 
     /// Header context within chain.
     uint32_t flags;

include/bitcoin/system/chain/enums/forks.hpp → include/bitcoin/system/chain/enums/flags.hpp

@@ -16,8 +16,8 @@
  * 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/>.
  */
-#ifndef LIBBITCOIN_SYSTEM_CHAIN_ENUMS_FORKS_HPP
-#define LIBBITCOIN_SYSTEM_CHAIN_ENUMS_FORKS_HPP
+#ifndef LIBBITCOIN_SYSTEM_CHAIN_ENUMS_FLAGS_HPP
+#define LIBBITCOIN_SYSTEM_CHAIN_ENUMS_FLAGS_HPP
 
 #include <bitcoin/system/define.hpp>
 #include <bitcoin/system/math/math.hpp>
@@ -26,7 +26,7 @@ namespace libbitcoin {
 namespace system {
 namespace chain {
 
-enum forks : uint32_t
+enum flags : uint32_t
 {
     /// Rules start at satoshi v0.3.0.
     /// Only satoshi-released hard forks, and enforced soft forks are included.
@@ -133,25 +133,25 @@ enum forks : uint32_t
 
     /// Rules that use bip34-based activation.
     bip34_activations =
-        forks::bip34_rule |
-        forks::bip65_rule |
-        forks::bip66_rule,
+        flags::bip34_rule |
+        flags::bip65_rule |
+        flags::bip66_rule,
 
     /// Rules that use BIP9 bit 0 first time activation.
     bip9_bit0_group =
-        forks::bip68_rule |
-        forks::bip112_rule |
-        forks::bip113_rule,
+        flags::bip68_rule |
+        flags::bip112_rule |
+        flags::bip113_rule,
 
     /// Rules that use BIP9 bit 1 first time activation.
     bip9_bit1_group =
-        forks::bip141_rule |
-        forks::bip143_rule |
-        forks::bip147_rule,
+        flags::bip141_rule |
+        flags::bip143_rule |
+        flags::bip147_rule,
 
     /////// Rules that use BIP9 bit 4 first time activation.
     ////bip9_bit4_group =
-    ////    forks::bip91_rule,
+    ////    flags::bip91_rule,
 
     /// Mask to set all rule bits.
     all_rules = bit_all<uint32_t>

include/bitcoin/system/chain/enums/policy.hpp

@@ -26,7 +26,7 @@ namespace libbitcoin {
 namespace system {
 namespace chain {
 
-/// Analog to chain::forks but without impacting validation. These provide
+/// Analog to chain::flags but without impacting validation. These provide
 /// additional validation context, giving a node the option to reject an
 /// unconfirmed transaction.
 enum policy : uint32_t

include/bitcoin/system/chain/operation.hpp

@@ -394,7 +394,7 @@ class BC_API operation
     void to_data(writer& sink) const NOEXCEPT;
 
     // TODO: move to config serialization wrapper.
-    std::string to_string(uint32_t active_forks) const NOEXCEPT;
+    std::string to_string(uint32_t active_flags) const NOEXCEPT;
 
     /// Properties.
     /// -----------------------------------------------------------------------

include/bitcoin/system/chain/script.hpp

@@ -24,7 +24,7 @@
 #include <string>
 #include <vector>
 #include <bitcoin/system/chain/enums/coverage.hpp>
-#include <bitcoin/system/chain/enums/forks.hpp>
+#include <bitcoin/system/chain/enums/flags.hpp>
 #include <bitcoin/system/chain/enums/magic_numbers.hpp>
 #include <bitcoin/system/chain/enums/script_pattern.hpp>
 #include <bitcoin/system/chain/enums/script_version.hpp>
@@ -51,10 +51,11 @@ class BC_API script
     /// Utilities.
     /// -----------------------------------------------------------------------
 
-    /// Determine if the fork is enabled in the active forks set.
-    static constexpr bool is_enabled(uint32_t active_forks, forks fork) NOEXCEPT
+    /// Determine if the flag is enabled in the active flags set.
+    static constexpr bool is_enabled(uint32_t active_flags,
+        chain::flags flag) NOEXCEPT
     {
-        return to_bool(fork & active_forks);
+        return to_bool(flag & active_flags);
     }
 
     static inline bool is_push_only(const operations& ops) NOEXCEPT
@@ -471,7 +472,7 @@ class BC_API script
     void to_data(writer& sink, bool prefix) const NOEXCEPT;
 
     // TODO: move to config serialization wrapper.
-    std::string to_string(uint32_t active_forks) const NOEXCEPT;
+    std::string to_string(uint32_t active_flags) const NOEXCEPT;
 
     /// Properties.
     /// -----------------------------------------------------------------------
@@ -489,8 +490,8 @@ class BC_API script
     /// -----------------------------------------------------------------------
 
     /// Pattern optimizations.
-    bool is_pay_to_witness(uint32_t forks) const NOEXCEPT;
-    bool is_pay_to_script_hash(uint32_t forks) const NOEXCEPT;
+    bool is_pay_to_witness(uint32_t active_flags) const NOEXCEPT;
+    bool is_pay_to_script_hash(uint32_t active_flags) const NOEXCEPT;
 
     /// Common pattern detection.
     const data_chunk& witness_program() const NOEXCEPT;

include/bitcoin/system/chain/transaction.hpp

@@ -126,17 +126,18 @@ class BC_API transaction
 
     // signature_hash exposed for op_check_multisig caching.
     hash_digest signature_hash(const input_iterator& input, const script& sub,
-        uint64_t value, uint8_t flags, script_version version,
+        uint64_t value, uint8_t sighash_flags, script_version version,
         bool bip143) const NOEXCEPT;
 
     bool check_signature(const ec_signature& signature,
         const data_slice& public_key, const script& sub, uint32_t index,
-        uint64_t value, uint8_t flags, script_version version,
+        uint64_t value, uint8_t sighash_flags, script_version version,
         bool bip143) const NOEXCEPT;
 
     bool create_endorsement(endorsement& out, const ec_secret& secret,
-        const script& sub, uint32_t index, uint64_t value, uint8_t flags,
-        script_version version, bool bip143) const NOEXCEPT;
+        const script& sub, uint32_t index, uint64_t value,
+        uint8_t sighash_flags, script_version version,
+        bool bip143) const NOEXCEPT;
 
     /// Guards (for tx pool without compact blocks).
     /// -----------------------------------------------------------------------
@@ -226,15 +227,15 @@ class BC_API transaction
     input_iterator input_at(uint32_t index) const NOEXCEPT;
     uint32_t input_index(const input_iterator& input) const NOEXCEPT;
     void signature_hash_single(writer& sink, const input_iterator& input,
-        const script& sub, uint8_t flags) const NOEXCEPT;
+        const script& sub, uint8_t sighash_flags) const NOEXCEPT;
     void signature_hash_none(writer& sink, const input_iterator& input,
-        const script& sub, uint8_t flags) const NOEXCEPT;
+        const script& sub, uint8_t sighash_flags) const NOEXCEPT;
     void signature_hash_all(writer& sink, const input_iterator& input,
-        const script& sub, uint8_t flags) const NOEXCEPT;
+        const script& sub, uint8_t sighash_flags) const NOEXCEPT;
     hash_digest unversioned_signature_hash(const input_iterator& input,
-        const script& sub, uint8_t flags) const NOEXCEPT;
+        const script& sub, uint8_t sighash_flags) const NOEXCEPT;
     hash_digest version_0_signature_hash(const input_iterator& input,
-        const script& sub, uint64_t value, uint8_t flags,
+        const script& sub, uint64_t value, uint8_t sighash_flags,
         bool bip143) const NOEXCEPT;
 
     // Transaction should be stored as shared (adds 16 bytes).