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move to a predicate-based module system, move to loader.[rs|pl]-based compilation, add support for incremental clause compilation

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This commit is contained in:
Mark Thom
2021-01-30 14:32:47 -07:00
parent b33158b92e
commit a4d15bfb88
55 changed files with 10501 additions and 7601 deletions
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194
src/clause_types.rs
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@@ -150,11 +150,11 @@ impl InlinedClauseType {
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub enum SystemClauseType {
AbolishClause,
AbolishModuleClause,
AssertDynamicPredicateToBack,
AssertDynamicPredicateToFront,
AtEndOfExpansion,
// AbolishClause,
// AbolishModuleClause,
// AssertDynamicPredicateToBack,
// AssertDynamicPredicateToFront,
// AtEndOfExpansion,
AtomChars,
AtomCodes,
AtomLength,
@@ -189,8 +189,8 @@ pub enum SystemClauseType {
DynamicModuleResolution(usize),
EnqueueAttributeGoal,
EnqueueAttributedVar,
ExpandGoal,
ExpandTerm,
// ExpandGoal,
// ExpandTerm,
FetchGlobalVar,
FetchGlobalVarWithOffset,
FirstStream,
@@ -207,16 +207,16 @@ pub enum SystemClauseType {
GetAttrVarQueueDelimiter,
GetAttrVarQueueBeyond,
GetBValue,
GetClause,
// GetClause,
GetContinuationChunk,
GetModuleClause,
// GetModuleClause,
GetNextDBRef,
GetNextOpDBRef,
IsPartialString,
LookupDBRef,
LookupOpDBRef,
Halt,
ModuleHeadIsDynamic,
// ModuleHeadIsDynamic,
GetLiftedHeapFromOffset,
GetLiftedHeapFromOffsetDiff,
GetSCCCleaner,
@@ -224,11 +224,11 @@ pub enum SystemClauseType {
InstallSCCCleaner,
InstallInferenceCounter,
LiftedHeapLength,
ModuleAssertDynamicPredicateToFront,
ModuleAssertDynamicPredicateToBack,
LoadLibraryAsStream,
// ModuleAssertDynamicPredicateToFront,
// ModuleAssertDynamicPredicateToBack,
ModuleExists,
ModuleOf,
ModuleRetractClause,
// ModuleRetractClause,
NextEP,
NoSuchPredicate,
NumberToChars,
@@ -254,7 +254,7 @@ pub enum SystemClauseType {
ResetContinuationMarker,
ResetGlobalVarAtKey,
ResetGlobalVarAtOffset,
RetractClause,
// RetractClause,
RestoreCutPolicy,
SetCutPoint(RegType),
SetInput,
@@ -324,11 +324,11 @@ pub enum SystemClauseType {
impl SystemClauseType {
pub fn name(&self) -> ClauseName {
match self {
&SystemClauseType::AbolishClause => clause_name!("$abolish_clause"),
&SystemClauseType::AbolishModuleClause => clause_name!("$abolish_module_clause"),
&SystemClauseType::AssertDynamicPredicateToBack => clause_name!("$assertz"),
&SystemClauseType::AssertDynamicPredicateToFront => clause_name!("$asserta"),
&SystemClauseType::AtEndOfExpansion => clause_name!("$at_end_of_expansion"),
// &SystemClauseType::AbolishClause => clause_name!("$abolish_clause"),
// &SystemClauseType::AbolishModuleClause => clause_name!("$abolish_module_clause"),
// &SystemClauseType::AssertDynamicPredicateToBack => clause_name!("$assertz"),
// &SystemClauseType::AssertDynamicPredicateToFront => clause_name!("$asserta"),
// &SystemClauseType::AtEndOfExpansion => clause_name!("$at_end_of_expansion"),
&SystemClauseType::AtomChars => clause_name!("$atom_chars"),
&SystemClauseType::AtomCodes => clause_name!("$atom_codes"),
&SystemClauseType::AtomLength => clause_name!("$atom_length"),
@@ -356,17 +356,50 @@ impl SystemClauseType {
&SystemClauseType::WorkingDirectory => clause_name!("$working_directory"),
&SystemClauseType::PathCanonical => clause_name!("$path_canonical"),
&SystemClauseType::FileTime => clause_name!("$file_time"),
&SystemClauseType::REPL(REPLCodePtr::CompileBatch) => clause_name!("$compile_batch"),
&SystemClauseType::REPL(REPLCodePtr::UseModule) => clause_name!("$use_module"),
&SystemClauseType::REPL(REPLCodePtr::UseQualifiedModule) => {
clause_name!("$use_qualified_module")
}
&SystemClauseType::REPL(REPLCodePtr::UseModuleFromFile) => {
clause_name!("$use_module_from_file")
}
&SystemClauseType::REPL(REPLCodePtr::UseQualifiedModuleFromFile) => {
clause_name!("$use_qualified_module_from_file")
}
&SystemClauseType::REPL(REPLCodePtr::AddDynamicPredicate) =>
clause_name!("$add_dynamic_predicate"),
&SystemClauseType::REPL(REPLCodePtr::AddGoalExpansionClause) =>
clause_name!("$add_goal_expansion_clause"),
&SystemClauseType::REPL(REPLCodePtr::AddTermExpansionClause) =>
clause_name!("$add_term_expansion_clause"),
&SystemClauseType::REPL(REPLCodePtr::ClauseToEvacuable) =>
clause_name!("$clause_to_evacuable"),
&SystemClauseType::REPL(REPLCodePtr::ConcludeLoad) =>
clause_name!("$conclude_load"),
&SystemClauseType::REPL(REPLCodePtr::DeclareModule) =>
clause_name!("$declare_module"),
&SystemClauseType::REPL(REPLCodePtr::LoadCompiledLibrary) =>
clause_name!("$load_compiled_library"),
&SystemClauseType::REPL(REPLCodePtr::PushLoadStatePayload) =>
clause_name!("$push_load_state_payload"),
&SystemClauseType::REPL(REPLCodePtr::UserAsserta) =>
clause_name!("$asserta"),
&SystemClauseType::REPL(REPLCodePtr::UserAssertz) =>
clause_name!("$assertz"),
&SystemClauseType::REPL(REPLCodePtr::UserRetract) =>
clause_name!("$retract_clause"),
&SystemClauseType::REPL(REPLCodePtr::UseModule) =>
clause_name!("$use_module"),
&SystemClauseType::REPL(REPLCodePtr::PushLoadContext) =>
clause_name!("$push_load_context"),
&SystemClauseType::REPL(REPLCodePtr::PopLoadContext) =>
clause_name!("$pop_load_context"),
&SystemClauseType::REPL(REPLCodePtr::PopLoadStatePayload) =>
clause_name!("$pop_load_state_payload"),
&SystemClauseType::REPL(REPLCodePtr::LoadContextSource) =>
clause_name!("$prolog_lc_source"),
&SystemClauseType::REPL(REPLCodePtr::LoadContextFile) =>
clause_name!("$prolog_lc_file"),
&SystemClauseType::REPL(REPLCodePtr::LoadContextDirectory) =>
clause_name!("$prolog_lc_dir"),
&SystemClauseType::REPL(REPLCodePtr::LoadContextModule) =>
clause_name!("$prolog_lc_module"),
&SystemClauseType::REPL(REPLCodePtr::LoadContextStream) =>
clause_name!("$prolog_lc_stream"),
&SystemClauseType::REPL(REPLCodePtr::MetaPredicateProperty) =>
clause_name!("$cpp_meta_predicate_property"),
&SystemClauseType::REPL(REPLCodePtr::CompilePendingPredicates) =>
clause_name!("$compile_pending_predicates"),
&SystemClauseType::Close => clause_name!("$close"),
&SystemClauseType::CopyToLiftedHeap => clause_name!("$copy_to_lh"),
&SystemClauseType::DeleteAttribute => clause_name!("$del_attr_non_head"),
@@ -374,12 +407,9 @@ impl SystemClauseType {
&SystemClauseType::DynamicModuleResolution(_) => clause_name!("$module_call"),
&SystemClauseType::EnqueueAttributeGoal => clause_name!("$enqueue_attribute_goal"),
&SystemClauseType::EnqueueAttributedVar => clause_name!("$enqueue_attr_var"),
&SystemClauseType::ExpandTerm => clause_name!("$expand_term"),
&SystemClauseType::ExpandGoal => clause_name!("$expand_goal"),
&SystemClauseType::FetchGlobalVar => clause_name!("$fetch_global_var"),
&SystemClauseType::FetchGlobalVarWithOffset => {
clause_name!("$fetch_global_var_with_offset")
}
&SystemClauseType::FetchGlobalVarWithOffset =>
clause_name!("$fetch_global_var_with_offset"),
&SystemClauseType::FirstStream => clause_name!("$first_stream"),
&SystemClauseType::FlushOutput => clause_name!("$flush_output"),
&SystemClauseType::GetByte => clause_name!("$get_byte"),
@@ -405,13 +435,13 @@ impl SystemClauseType {
clause_name!("$get_lh_from_offset_diff")
}
&SystemClauseType::GetBValue => clause_name!("$get_b_value"),
&SystemClauseType::GetClause => clause_name!("$get_clause"),
// &SystemClauseType::GetClause => clause_name!("$get_clause"),
&SystemClauseType::GetNextDBRef => clause_name!("$get_next_db_ref"),
&SystemClauseType::GetNextOpDBRef => clause_name!("$get_next_op_db_ref"),
&SystemClauseType::LookupDBRef => clause_name!("$lookup_db_ref"),
&SystemClauseType::LookupOpDBRef => clause_name!("$lookup_op_db_ref"),
&SystemClauseType::GetDoubleQuotes => clause_name!("$get_double_quotes"),
&SystemClauseType::GetModuleClause => clause_name!("$get_module_clause"),
// &SystemClauseType::GetModuleClause => clause_name!("$get_module_clause"),
&SystemClauseType::GetSCCCleaner => clause_name!("$get_scc_cleaner"),
&SystemClauseType::Halt => clause_name!("$halt"),
&SystemClauseType::HeadIsDynamic => clause_name!("$head_is_dynamic"),
@@ -430,15 +460,14 @@ impl SystemClauseType {
&SystemClauseType::Maybe => clause_name!("maybe"),
&SystemClauseType::CpuNow => clause_name!("$cpu_now"),
&SystemClauseType::CurrentTime => clause_name!("$current_time"),
&SystemClauseType::ModuleAssertDynamicPredicateToFront => {
clause_name!("$module_asserta")
}
&SystemClauseType::ModuleAssertDynamicPredicateToBack => {
clause_name!("$module_assertz")
}
&SystemClauseType::ModuleHeadIsDynamic => clause_name!("$module_head_is_dynamic"),
// &SystemClauseType::ModuleAssertDynamicPredicateToFront => {
// clause_name!("$module_asserta")
// }
// &SystemClauseType::ModuleAssertDynamicPredicateToBack => {
// clause_name!("$module_assertz")
// }
// &SystemClauseType::ModuleHeadIsDynamic => clause_name!("$module_head_is_dynamic"),
&SystemClauseType::ModuleExists => clause_name!("$module_exists"),
&SystemClauseType::ModuleOf => clause_name!("$module_of"),
&SystemClauseType::NextStream => clause_name!("$next_stream"),
&SystemClauseType::NoSuchPredicate => clause_name!("$no_such_predicate"),
&SystemClauseType::NumberToChars => clause_name!("$number_to_chars"),
@@ -483,14 +512,13 @@ impl SystemClauseType {
&SystemClauseType::GetCutPoint => clause_name!("$get_cp"),
&SystemClauseType::GetCurrentBlock => clause_name!("$get_current_block"),
&SystemClauseType::InstallNewBlock => clause_name!("$install_new_block"),
&SystemClauseType::ModuleRetractClause => clause_name!("$module_retract_clause"),
// &SystemClauseType::ModuleRetractClause => clause_name!("$module_retract_clause"),
&SystemClauseType::NextEP => clause_name!("$nextEP"),
&SystemClauseType::ReadQueryTerm => clause_name!("$read_query_term"),
&SystemClauseType::ReadTerm => clause_name!("$read_term"),
&SystemClauseType::ReadTermFromChars => clause_name!("$read_term_from_chars"),
&SystemClauseType::ResetGlobalVarAtKey => clause_name!("$reset_global_var_at_key"),
&SystemClauseType::ResetGlobalVarAtOffset => clause_name!("$reset_global_var_at_offset"),
&SystemClauseType::RetractClause => clause_name!("$retract_clause"),
&SystemClauseType::ResetBlock => clause_name!("$reset_block"),
&SystemClauseType::ResetContinuationMarker => clause_name!("$reset_cont_marker"),
&SystemClauseType::ReturnFromVerifyAttr => clause_name!("$return_from_verify_attr"),
@@ -533,22 +561,27 @@ impl SystemClauseType {
&SystemClauseType::SetEnv => clause_name!("$setenv"),
&SystemClauseType::UnsetEnv => clause_name!("$unsetenv"),
&SystemClauseType::CharsBase64 => clause_name!("$chars_base64"),
&SystemClauseType::LoadLibraryAsStream => clause_name!("$load_library_as_stream"),
}
}
pub fn from(name: &str, arity: usize) -> Option<SystemClauseType> {
match (name, arity) {
("$abolish_clause", 2) => Some(SystemClauseType::AbolishClause),
("$at_end_of_expansion", 0) => Some(SystemClauseType::AtEndOfExpansion),
// ("$abolish_clause", 2) => Some(SystemClauseType::AbolishClause),
("$add_dynamic_predicate", 3) =>
Some(SystemClauseType::REPL(REPLCodePtr::AddDynamicPredicate)),
("$add_goal_expansion_clause", 4) =>
Some(SystemClauseType::REPL(REPLCodePtr::AddGoalExpansionClause)),
("$add_term_expansion_clause", 3) =>
Some(SystemClauseType::REPL(REPLCodePtr::AddTermExpansionClause)),
// ("$at_end_of_expansion", 0) => Some(SystemClauseType::AtEndOfExpansion),
("$atom_chars", 2) => Some(SystemClauseType::AtomChars),
("$atom_codes", 2) => Some(SystemClauseType::AtomCodes),
("$atom_length", 2) => Some(SystemClauseType::AtomLength),
("$abolish_module_clause", 3) => Some(SystemClauseType::AbolishModuleClause),
// ("$abolish_module_clause", 3) => Some(SystemClauseType::AbolishModuleClause),
("$bind_from_register", 2) => Some(SystemClauseType::BindFromRegister),
("$module_asserta", 5) => Some(SystemClauseType::ModuleAssertDynamicPredicateToFront),
("$module_assertz", 5) => Some(SystemClauseType::ModuleAssertDynamicPredicateToBack),
("$asserta", 4) => Some(SystemClauseType::AssertDynamicPredicateToFront),
("$assertz", 4) => Some(SystemClauseType::AssertDynamicPredicateToBack),
// ("$module_asserta", 5) => Some(SystemClauseType::ModuleAssertDynamicPredicateToFront),
// ("$module_assertz", 5) => Some(SystemClauseType::ModuleAssertDynamicPredicateToBack),
("$call_continuation", 1) => Some(SystemClauseType::CallContinuation),
("$char_code", 2) => Some(SystemClauseType::CharCode),
("$char_type", 2) => Some(SystemClauseType::CharType),
@@ -559,7 +592,6 @@ impl SystemClauseType {
("$copy_term_without_attr_vars", 2) => Some(SystemClauseType::CopyTermWithoutAttrVars),
("$create_partial_string", 3) => Some(SystemClauseType::CreatePartialString),
("$check_cp", 1) => Some(SystemClauseType::CheckCutPoint),
("$compile_batch", 0) => Some(SystemClauseType::REPL(REPLCodePtr::CompileBatch)),
("$copy_to_lh", 2) => Some(SystemClauseType::CopyToLiftedHeap),
("$close", 2) => Some(SystemClauseType::Close),
("$current_hostname", 1) => Some(SystemClauseType::CurrentHostname),
@@ -582,8 +614,8 @@ impl SystemClauseType {
("$peek_char", 2) => Some(SystemClauseType::PeekChar),
("$peek_code", 2) => Some(SystemClauseType::PeekCode),
("$is_partial_string", 1) => Some(SystemClauseType::IsPartialString),
("$expand_term", 2) => Some(SystemClauseType::ExpandTerm),
("$expand_goal", 2) => Some(SystemClauseType::ExpandGoal),
// ("$expand_term", 2) => Some(SystemClauseType::ExpandTerm),
// ("$expand_goal", 2) => Some(SystemClauseType::ExpandGoal),
("$fetch_global_var", 2) => Some(SystemClauseType::FetchGlobalVar),
("$fetch_global_var_with_offset", 3) => Some(SystemClauseType::FetchGlobalVarWithOffset),
("$get_byte", 2) => Some(SystemClauseType::GetByte),
@@ -615,14 +647,14 @@ impl SystemClauseType {
}
("$get_attr_list", 2) => Some(SystemClauseType::GetAttributedVariableList),
("$get_b_value", 1) => Some(SystemClauseType::GetBValue),
("$get_clause", 2) => Some(SystemClauseType::GetClause),
("$get_module_clause", 3) => Some(SystemClauseType::GetModuleClause),
// ("$get_clause", 2) => Some(SystemClauseType::GetClause),
// ("$get_module_clause", 3) => Some(SystemClauseType::GetModuleClause),
("$get_lh_from_offset", 2) => Some(SystemClauseType::GetLiftedHeapFromOffset),
("$get_lh_from_offset_diff", 3) => Some(SystemClauseType::GetLiftedHeapFromOffsetDiff),
("$get_double_quotes", 1) => Some(SystemClauseType::GetDoubleQuotes),
("$get_scc_cleaner", 1) => Some(SystemClauseType::GetSCCCleaner),
("$halt", 1) => Some(SystemClauseType::Halt),
("$head_is_dynamic", 1) => Some(SystemClauseType::HeadIsDynamic),
("$head_is_dynamic", 2) => Some(SystemClauseType::HeadIsDynamic),
("$install_scc_cleaner", 2) => Some(SystemClauseType::InstallSCCCleaner),
("$install_inference_counter", 3) => Some(SystemClauseType::InstallInferenceCounter),
("$lh_length", 1) => Some(SystemClauseType::LiftedHeapLength),
@@ -630,10 +662,9 @@ impl SystemClauseType {
("$cpu_now", 1) => Some(SystemClauseType::CpuNow),
("$current_time", 1) => Some(SystemClauseType::CurrentTime),
("$module_exists", 1) => Some(SystemClauseType::ModuleExists),
("$module_of", 2) => Some(SystemClauseType::ModuleOf),
("$module_retract_clause", 5) => Some(SystemClauseType::ModuleRetractClause),
("$module_head_is_dynamic", 2) => Some(SystemClauseType::ModuleHeadIsDynamic),
("$no_such_predicate", 1) => Some(SystemClauseType::NoSuchPredicate),
// ("$module_retract_clause", 5) => Some(SystemClauseType::ModuleRetractClause),
// ("$module_head_is_dynamic", 2) => Some(SystemClauseType::ModuleHeadIsDynamic),
("$no_such_predicate", 2) => Some(SystemClauseType::NoSuchPredicate),
("$number_to_chars", 2) => Some(SystemClauseType::NumberToChars),
("$number_to_codes", 2) => Some(SystemClauseType::NumberToCodes),
("$op", 3) => Some(SystemClauseType::OpDeclaration),
@@ -667,7 +698,7 @@ impl SystemClauseType {
("$reset_cont_marker", 0) => Some(SystemClauseType::ResetContinuationMarker),
("$reset_global_var_at_key", 1) => Some(SystemClauseType::ResetGlobalVarAtKey),
("$reset_global_var_at_offset", 3) => Some(SystemClauseType::ResetGlobalVarAtOffset),
("$retract_clause", 4) => Some(SystemClauseType::RetractClause),
// ("$retract_clause", 4) => Some(SystemClauseType::RetractClause),
("$return_from_verify_attr", 0) => Some(SystemClauseType::ReturnFromVerifyAttr),
("$set_ball", 1) => Some(SystemClauseType::SetBall),
("$set_cp_by_default", 1) => Some(SystemClauseType::SetCutPointByDefault(temp_v!(1))),
@@ -697,15 +728,17 @@ impl SystemClauseType {
("$working_directory", 2) => Some(SystemClauseType::WorkingDirectory),
("$path_canonical", 2) => Some(SystemClauseType::PathCanonical),
("$file_time", 3) => Some(SystemClauseType::FileTime),
("$use_module", 1) => Some(SystemClauseType::REPL(REPLCodePtr::UseModule)),
("$use_module_from_file", 1) =>
Some(SystemClauseType::REPL(REPLCodePtr::UseModuleFromFile)),
("$use_qualified_module", 2) =>
Some(SystemClauseType::REPL(REPLCodePtr::UseQualifiedModule)),
("$use_qualified_module_from_file", 2) =>
Some(SystemClauseType::REPL(REPLCodePtr::UseQualifiedModuleFromFile)),
("$clause_to_evacuable", 3) => Some(SystemClauseType::REPL(REPLCodePtr::ClauseToEvacuable)),
("$conclude_load", 1) => Some(SystemClauseType::REPL(REPLCodePtr::ConcludeLoad)),
("$use_module", 3) => Some(SystemClauseType::REPL(REPLCodePtr::UseModule)),
("$declare_module", 3) => Some(SystemClauseType::REPL(REPLCodePtr::DeclareModule)),
("$load_compiled_library", 2) => Some(SystemClauseType::REPL(REPLCodePtr::LoadCompiledLibrary)),
("$push_load_state_payload", 1) => Some(SystemClauseType::REPL(REPLCodePtr::PushLoadStatePayload)),
("$asserta", 4) => Some(SystemClauseType::REPL(REPLCodePtr::UserAsserta)),
("$assertz", 4) => Some(SystemClauseType::REPL(REPLCodePtr::UserAssertz)),
("$retract_clause", 3) => Some(SystemClauseType::REPL(REPLCodePtr::UserRetract)),
("$variant", 2) => Some(SystemClauseType::Variant),
("$wam_instructions", 3) => Some(SystemClauseType::WAMInstructions),
("$wam_instructions", 4) => Some(SystemClauseType::WAMInstructions),
("$write_term", 7) => Some(SystemClauseType::WriteTerm),
("$write_term_to_chars", 7) => Some(SystemClauseType::WriteTermToChars),
("$scryer_prolog_version", 1) => Some(SystemClauseType::ScryerPrologVersion),
@@ -727,6 +760,17 @@ impl SystemClauseType {
("$setenv", 2) => Some(SystemClauseType::SetEnv),
("$unsetenv", 1) => Some(SystemClauseType::UnsetEnv),
("$chars_base64", 4) => Some(SystemClauseType::CharsBase64),
("$load_library_as_stream", 3) => Some(SystemClauseType::LoadLibraryAsStream),
("$push_load_context", 2) => Some(SystemClauseType::REPL(REPLCodePtr::PushLoadContext)),
("$pop_load_state_payload", 1) => Some(SystemClauseType::REPL(REPLCodePtr::PopLoadStatePayload)),
("$pop_load_context", 0) => Some(SystemClauseType::REPL(REPLCodePtr::PopLoadContext)),
("$prolog_lc_source", 1) => Some(SystemClauseType::REPL(REPLCodePtr::LoadContextSource)),
("$prolog_lc_file", 1) => Some(SystemClauseType::REPL(REPLCodePtr::LoadContextFile)),
("$prolog_lc_dir", 1) => Some(SystemClauseType::REPL(REPLCodePtr::LoadContextDirectory)),
("$prolog_lc_module", 1) => Some(SystemClauseType::REPL(REPLCodePtr::LoadContextModule)),
("$prolog_lc_stream", 1) => Some(SystemClauseType::REPL(REPLCodePtr::LoadContextStream)),
("$cpp_meta_predicate_property", 3) => Some(SystemClauseType::REPL(REPLCodePtr::MetaPredicateProperty)),
("$compile_pending_predicates", 1) => Some(SystemClauseType::REPL(REPLCodePtr::CompilePendingPredicates)),
_ => None,
}
}
@@ -754,7 +798,6 @@ pub enum BuiltInClauseType {
pub enum ClauseType {
BuiltIn(BuiltInClauseType),
CallN,
Hook(CompileTimeHook),
Inlined(InlinedClauseType),
Named(ClauseName, usize, CodeIndex), // name, arity, index.
Op(ClauseName, SharedOpDesc, CodeIndex),
@@ -818,7 +861,6 @@ impl ClauseType {
match self {
&ClauseType::BuiltIn(ref built_in) => built_in.name(),
&ClauseType::CallN => clause_name!("call"),
&ClauseType::Hook(ref hook) => hook.name(),
&ClauseType::Inlined(ref inlined) => clause_name!(inlined.name()),
&ClauseType::Op(ref name, ..) => name.clone(),
&ClauseType::Named(ref name, ..) => name.clone(),