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mintrace.pl
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mintrace.pl
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% _______________ determinism checks _______________
:- dynamic detchecked/1.
det(Functor/Arity) :-
ignore(retract(detchecked(Functor/Arity))),
assert(detchecked(Functor/Arity)),
length(Args, Arity),
Head =.. [Functor | Args],
atom_concat('__detcheck$', Functor, MangledFunctor),
MangledHead =.. [MangledFunctor | Args],
ignore(retract((Head :- _))),
assert((Head :- (MangledHead, ! ;
deterror(Head)))).
deterror(Head) :-
tell(user_error),
nl,
write('*** Predicate call should not have failed:'),
nl,
writeq(Head),
nl,
assertion(fail).
term_expansion((Head :- Body), (MangledHead :- Body)) :-
!,
term_expansion(Head, MangledHead).
term_expansion(Head, MangledHead) :-
Head =.. [Functor | Args],
length(Args, Arity),
detchecked(Functor/Arity),
!,
atom_concat('__detcheck$', Functor, MangledFunctor),
MangledHead =.. [MangledFunctor | Args].
% _______________ helpers _______________
% lookup(Name, Env, Res) lookup a variable Name in an environment Env and return
% result Res. The environment is a list of Name/Value terms.
:- det(lookup/3).
lookup(X, [], _) :- throw(key_not_found(X)).
lookup(Name, [Name/Value | _], Value) :- !.
lookup(Name, [_ | Rest], Value) :- lookup(Name, Rest, Value).
% write(Env, Var, Val, NEnv) set the binding of variable Var in an
% environment Env to value Val and return a new environment NEnv.
:- det(store/4).
store([], X, V, [X/V]).
store([Name/_ | Rest], Name, Value, [Name/Value | Rest]) :- !.
store([Pair | Rest], Name, Value, [Pair | NewRest]) :- store(Rest, Name, Value, NewRest).
remove_from_env(_, [], []).
remove_from_env(X, [X/_ | T], T) :- !.
remove_from_env(X, [A/B | T1], [A/B | T2]) :-
remove_from_env(X, T1, T2).
% resolve(Arg, IState, Val) turn an argument Arg (which can be either a variable
% or a constant) into a value Val, either by just unwrapping a constant or by
% doing a lookup in the environment.
:- det(resolve/3).
resolve(const(X), _IState, X).
resolve(var(X), IState, Y) :-
get_env(IState, Env),
lookup(X, Env, Y).
:- det(resolve_args/3).
resolve_args([], _, []).
resolve_args([Arg|T1], Env, [RArg|T2]) :-
resolve(Arg, Env, RArg),
resolve_args(T1, Env, T2).
% execute operations
:- det(do_op/4).
do_op(mul, X, Y, Z) :- Z is X * Y.
do_op(add, X, Y, Z) :- Z is X + Y.
do_op(sub, X, Y, Z) :- Z is X - Y.
do_op(eq, X, Y, Z) :- X == Y -> Z = 1; Z = 0.
do_op(ge, X, Y, Z) :- X >= Y -> Z = 1; Z = 0.
do_op(readlist, L, I, X) :- nth0(I, L, X).
do_op(assign, A, _, A).
do_op(Op, _, _, _) :- throw(missing_op(Op)).
% ensure(Goal) makes sure that goal Goal succeeds, otherwise throws an
% exception (like an assert statement in C and similar languages)
ensure(Goal) :-
call(Goal) -> true; throw(assertion_failed(Goal)).
% _______________ interpreter _______________
% check_syntax_interp(Labels) to check whether the argument is a syntactically valid program.
:- det(check_syntax_interp/1).
check_syntax_interp(Functions) :-
check_syntax_interp(Functions, Functions).
:- det(check_syntax_interp/2).
check_syntax_interp([], _).
check_syntax_interp([Name/func(Args, _, Labels) | Rest], AllFuncs) :-
atom(Name),
write(checking(Name)), nl,
check_syntax_interp_allargs(Args),
check_syntax_interp_labels(Labels, code(Labels, AllFuncs)),
write(ok(Name)), nl,
check_syntax_interp(Rest, AllFuncs).
check_syntax_interp_allargs([]).
check_syntax_interp_allargs([H|T]) :-
atom(H),
check_syntax_interp_allargs(T).
:- det(check_syntax_interp_labels/2).
check_syntax_interp_labels([], _).
check_syntax_interp_labels([Name/Op | Rest], Code) :-
atom(Name),
check_syntax_interp_op(Op, Code),
check_syntax_interp_labels(Rest, Code).
:- det(check_syntax_interp_op/2).
check_syntax_interp_op(op(Res, Op, Arg1, Arg2, Rest), Code) :-
atom(Res), member(Op, [mul, add, sub, ge, eq, assign, readlist]),
check_syntax_interp_arg(Arg1),
check_syntax_interp_arg(Arg2),
check_syntax_interp_op(Rest, Code).
check_syntax_interp_op(new(Res, Shape, Rest), Code) :-
atom(Res),
atom(Shape),
check_syntax_interp_op(Rest, Code).
check_syntax_interp_op(set(Arg, Field, ArgValue, Rest), Code) :-
check_syntax_interp_arg(Arg),
check_syntax_interp_arg(ArgValue),
atom(Field),
check_syntax_interp_op(Rest, Code).
check_syntax_interp_op(get(Res, Arg, Field, Rest), Code) :-
atom(Res),
check_syntax_interp_arg(Arg),
atom(Field),
check_syntax_interp_op(Rest, Code).
check_syntax_interp_op(if_class(Arg, Shape, L1, L2), Code) :-
atom(Shape),
check_syntax_interp_arg(Arg),
check_label_exists(L1, Code),
check_label_exists(L2, Code).
check_syntax_interp_op(promote(Arg, L1), Code) :-
check_syntax_interp_arg(Arg),
check_label_exists(L1, Code).
check_syntax_interp_op(call(Res, FuncName, Args, L), Code) :-
atom(Res),
check_syntax_interp_args(Args),
check_label_exists(L, Code),
check_function_exists(FuncName, Code).
check_syntax_interp_op(if(Arg, L1, L2), Code) :-
check_syntax_interp_arg(Arg),
check_label_exists(L1, Code),
check_label_exists(L2, Code).
check_syntax_interp_op(jump(L), Code) :-
check_label_exists(L, Code).
check_syntax_interp_op(error(Reason), _) :-
atom(Reason).
check_syntax_interp_op(return(Arg), _) :-
check_syntax_interp_arg(Arg).
check_syntax_interp_args([]).
check_syntax_interp_args([Arg|T]) :-
check_syntax_interp_arg(Arg),
check_syntax_interp_args(T).
check_syntax_interp_arg(var(Name)) :- atom(Name).
check_syntax_interp_arg(const(_)).
check_label_exists(L, Code) :-
lookup_label(L, Code, _).
check_function_exists(FuncName, code(_, Functions)) :-
lookup(FuncName, Functions, _).
% _______________
interp_function(FuncName, Functions, Args, Res) :-
lookup_function(FuncName, code([], Functions), ArgNames, Code, FirstLabel),
ensure(same_length(ArgNames, Args)),
create_start_env(ArgNames, Args, Env),
interp_label(FirstLabel, Code, Env, [], Res).
lookup_label(Label, code(Labels, _), Block) :-
lookup(Label, Labels, Block).
lookup_function(FuncName, Code, ArgNames, FuncCode, FirstLabel) :-
lookup_function(FuncName, Code, ArgNames, _, FuncCode, FirstLabel).
lookup_function(FuncName, code(_, Functions), ArgNames, Loopy, code(Labels, Functions), FirstLabel) :-
lookup(FuncName, Functions, func(ArgNames, Loopy, Labels)),
Labels = [FirstLabel/ _| _].
interp_state(Env, Heap, Stack, Res, interpstate(Env, Heap, Stack, Res)).
:- det(get_result/2).
get_result(interpstate(_Env, _Heap, _Stack, Res), Res).
:- det(get_env/2).
:- discontiguous get_env/2.
get_env(interpstate(Env, _Heap, _Stack, _Res), Env).
:- det(set_result/3).
set_env(interpstate(_Env, Heap, Stack, Res), NEnv, interpstate(NEnv, Heap, Stack, Res)).
:- det(get_heap/2).
get_heap(interpstate(_Env, Heap, _Stack, _Res), Heap).
:- det(set_heap/3).
set_heap(interpstate(Env, _Heap, Stack, Res), NHeap, interpstate(Env, NHeap, Stack, Res)).
:- det(get_stack/2).
get_stack(interpstate(_Env, _Heap, Stack, _Res), Stack).
:- det(set_stack/3).
set_stack(interpstate(Env, Heap, _Stack, Res), NStack, interpstate(Env, Heap, NStack, Res)).
:- det(write_env/4).
write_env(IState, Var, Value, NIState) :-
get_env(IState, Env),
store(Env, Var, Value, NEnv),
set_env(IState, NEnv, NIState).
create_start_env([], [], []).
create_start_env([Name|T1], [Val|T2], [Name/Val|T3]) :-
create_start_env(T1, T2, T3).
interp_label(Label, Code, Env, Stack, Res) :-
interp_label(Label, Code, Env, [], Stack, Res).
interp_label(Label, Code, Env, Heap, Stack, Res) :-
interp_state(Env, Heap, Stack, Res, IState),
interp_label(Label, Code, IState).
interp_label(Label, Code, IState) :-
lookup_label(Label, Code, Block),
interp(Block, Code, IState).
interp_jump(L, Code, IState) :-
lookup_label(L, Code, Block),
interp(Block, Code, IState).
% interp(Block, Code, IState) executes flow graph program Block
:- det(interp/3).
interp(op(ResultVar, Op, Arg1, Arg2, NextOp), Code, IState) :-
interp_op(ResultVar, Op, Arg1, Arg2, IState, NIState),
interp(NextOp, Code, NIState).
interp(promote(_, L), Code, IState) :-
interp_jump(L, Code, IState).
interp(jump(L), Code, IState) :-
interp_jump(L, Code, IState).
interp(if(Arg, L1, L2), Code, IState) :-
resolve(Arg, IState, RArg),
(RArg == 0 ->
L = L2
;
L = L1
),
interp_jump(L, Code, IState).
interp(return(Arg), _, IState) :-
resolve(Arg, IState, Val),
get_stack(IState, Stack),
interp_return(Stack, Val, IState).
interp_return([], Val, IState) :-
get_result(IState, Val),
print(Val), nl.
interp_return([frame(L, Code, Env, ResultVar)| Stack], Val, IState) :-
store(Env, ResultVar, Val, NEnv),
set_env(IState, NEnv, IState1),
set_stack(IState1, Stack, NIState),
interp_jump(L, Code, NIState).
% object operations
interp(new(ResultVar, Class, NextOp), Code, IState) :-
new_object(ResultVar, Class, IState, NIState),
interp(NextOp, Code, NIState).
interp(get(ResultVar, Arg, Field, NextOp), Code, IState) :-
resolve(Arg, IState, RArg),
get_object(RArg, IState, Obj),
get_field(Obj, Field, Value),
write_env(IState, ResultVar, Value, NIState),
interp(NextOp, Code, NIState).
interp(set(Arg, Field, ValueArg, NextOp), Code, IState) :-
resolve(Arg, IState, Address),
resolve(ValueArg, IState, Value),
set_field(Address, Field, Value, IState, NIState),
interp(NextOp, Code, NIState).
interp(if_class(Arg, Cls, L1, L2), Code, IState) :-
resolve(Arg, IState, RArg),
get_object(RArg, IState, obj(Cls1, _)),
(Cls == Cls1 ->
L = L1
;
L = L2
),
lookup_label(L, Code, Block),
interp(Block, Code, IState).
% call
interp(call(ResultVar, FuncName, Args, L), Code, IState) :-
lookup_function(FuncName, Code, ArgNames, NCode, Label),
resolve_args(Args, IState, RArgs),
create_start_env(ArgNames, RArgs, StartEnv),
get_env(IState, Env),
get_stack(IState, Stack),
NStack = [frame(L, Code, Env, ResultVar) | Stack],
set_env(IState, StartEnv, IState1),
set_stack(IState1, NStack, NIState),
interp_label(Label, NCode, NIState).
interp_op(ResultVar, Op, Arg1, Arg2, IState, NIState) :-
resolve(Arg1, IState, RArg1),
resolve(Arg2, IState, RArg2),
do_op(Op, RArg1, RArg2, Res),
write_env(IState, ResultVar, Res, NIState).
% heap manipulation
new_object_heap(Class, Heap, [NewObj/obj(Class, [])|Heap], NewObj) :-
gensym(Class, NewObj). % invent address
new_object(ResultVar, Class, IState, NIState) :-
get_heap(IState, Heap),
new_object_heap(Class, Heap, NHeap, NewObj),
set_heap(IState, NHeap, IState1),
write_env(IState1, ResultVar, NewObj, NIState).
get_object(Address, IState, Object) :-
get_heap(IState, Heap),
lookup(Address, Heap, Object).
get_field(obj(_, Fields), Field, Value) :-
lookup(Field, Fields, Value).
set_field(Address, Field, Value, IState, NIState) :-
get_heap(IState, Heap),
lookup(Address, Heap, obj(Cls, Fields)),
store(Fields, Field, Value, NFields),
store(Heap, Address, obj(Cls, NFields), NHeap),
set_heap(IState, NHeap, NIState).
% _______________ simple tracer _______________
% do_trace(Label, Env) start tracing of code at label Label with environment Env
do_trace(FuncName, L, Functions, Env, Res) :-
lookup(FuncName, Functions, func(_, _, Labels)),
interp_state(Env, [], [], Res, IState),
do_trace(L, code(Labels, Functions), IState).
do_trace(L, Code, IState) :-
lookup_label(L, Code, StartCode),
trace(StartCode, Code, IState, [], tstate(L)).
check_syntax_trace(op(_, _, _, _, T), Labels) :-
check_syntax_trace(T, Labels).
check_syntax_trace(new(_, _, T), Labels) :-
check_syntax_trace(T, Labels).
check_syntax_trace(get(_, _, _, T), Labels) :-
check_syntax_trace(T, Labels).
check_syntax_trace(set(_, _, _, T), Labels) :-
check_syntax_trace(T, Labels).
check_syntax_trace(guard(_, _, L, T), Labels) :-
lookup(L, Labels, _),
check_syntax_trace(T, Labels).
check_syntax_trace(guard_class(_, _, L, T), Labels) :-
lookup(L, Labels, _),
check_syntax_trace(T, Labels).
check_syntax_trace(enter(L, Labels, _, _, T), Labels) :-
lookup(L, Labels, _),
check_syntax_trace(T, Labels).
check_syntax_trace(return(_, T), Labels) :-
check_syntax_trace(T, Labels).
check_syntax_trace(loop, _).
% trace(Code, Labels, Env, Trace, TState) trace the code Code in environment Env
% yielding trace Trace. The TState contains information about where to end
% tracing and the full trace.
:- det(trace/8).
trace(op(ResultVar, Op, Arg1, Arg2, Rest), Code, IState, T, TState) :-
interp_op(ResultVar, Op, Arg1, Arg2, IState, NIState),
trace(Rest, Code, NIState, [op(ResultVar, Op, Arg1, Arg2) | T], TState).
trace(promote(Arg, L), Code, IState, T, TState) :-
resolve(Arg, IState, Val),
trace_jump(L, Code, IState, [guard(Arg, Val, L, Code) | T], TState).
trace(return(Arg), _, IState, T, TState) :-
resolve(Arg, IState, Val),
get_stack(IState, Stack),
trace_return(Stack, Val, IState, [return(Arg) | T], TState).
trace(jump(L), Code, IState, T, TState) :-
trace_jump(L, Code, IState, T, TState).
trace(if(Arg, L1, L2), Code, IState, T, TState) :-
resolve(Arg, IState, Val),
(Val == 0 ->
L = L2, OL = L1
;
ensure(Val == 1),
L = L1, OL = L2
),
trace_jump(L, Code, IState, [guard(Arg, Val, OL, Code) | T], TState).
trace(new(ResultVar, Class, NextOp), Code, IState, T, TState) :-
new_object(ResultVar, Class, IState, NIState),
trace(NextOp, Code, NIState, [new(ResultVar, Class)|T], TState).
trace(get(ResultVar, Arg, Field, NextOp), Code, IState, T, TState) :-
resolve(Arg, IState, RArg),
get_object(RArg, IState, Obj),
get_field(Obj, Field, Value),
write_env(IState, ResultVar, Value, NIState),
trace(NextOp, Code, NIState, [get(ResultVar, Arg, Field)|T], TState).
trace(set(Arg, Field, ValueArg, NextOp), Code, IState, T, TState) :-
resolve(Arg, IState, Address),
resolve(ValueArg, IState, Value),
set_field(Address, Field, Value, IState, NIState),
trace(NextOp, Code, NIState, [set(Arg, Field, ValueArg)|T], TState).
trace(if_class(Arg, Cls, L1, L2), Code, IState, T, TState) :-
resolve(Arg, IState, RArg),
get_object(RArg, IState, obj(Cls1, _)),
(Cls == Cls1 ->
L = L1, OL = L2
;
L = L2, OL = L1
),
trace_jump(L, Code, IState, [guard_class(Arg, Cls, OL, Code)| T], TState).
trace(call(ResultVar, FuncName, Args, L), Code, IState, T, TState) :-
lookup_function(FuncName, Code, ArgNames, Loopy, NewCode, FirstLabel),
Loopy = loop, !,
trace, NT = [call(ResultVar, FuncName, Args) | T],
xxx.
trace(call(ResultVar, FuncName, Args, L), Code, IState,
T, TState) :-
lookup_function(FuncName, Code, ArgNames, Loopy, NCode, Label),
Loopy = noloop, !,
resolve_args(Args, IState, RArgs),
create_start_env(ArgNames, RArgs, StartEnv),
get_env(IState, Env),
get_stack(IState, Stack),
NStack = [frame(L, Code, Env, ResultVar) | Stack],
set_env(IState, StartEnv, IState1),
set_stack(IState1, NStack, NIState),
create_start_env(ArgNames, Args, Mapping),
trace_jump(Label, NCode, NIState, [enter(L, Code, ResultVar, Mapping)|T], TState).
:- dynamic lasttrace/1.
trace_jump(L, _Code, IState, T, tstate(L)) :-
reverse([loop | T], FullTrace),
!, % prevent more tracing
write(trace), nl, write_trace(FullTrace), nl, % --
%check_syntax_trace(FullTrace, Labels),
get_env(IState, Env),
do_optimize(FullTrace, Env, RevOptTrace),
reverse(RevOptTrace, OptTrace),
retractall(lasttrace(_)),
assert(lasttrace(OptTrace)),
write(opttrace), nl, write_trace(OptTrace), nl, % --
runtrace_opt(OptTrace, IState, OptTrace).
trace_jump(L, Code, IState, T, TState) :-
lookup_label(L, Code, Block),
trace(Block, Code, IState, T, TState).
trace_return([], Val, IState) :-
get_result(IState, Val),
print(Val), nl.
trace_return([frame(L, Code, Env, ResultVar)|Stack], Val, IState, T, TState) :-
store(Env, ResultVar, Val, NEnv),
set_env(IState, NEnv, IState1),
set_stack(IState1, Stack, NIState),
trace_jump(L, Code, NIState, T, TState).
% write_trace(Trace) print trace Trace in a readable way
:- det(write_trace/1).
write_trace([]).
write_trace([Op | T]) :-
write_trace_op(Op), nl,
write_trace(T).
write_trace_op(guard(V, Val, L, _)) :-
write(guard(V, Val, L)), !.
write_trace_op(guard(V, Val, _, L, _)) :-
write(guard(V, Val, L)), !.
write_trace_op(guard_class(V, Val, L, _)) :-
write(guard_class(V, Val, L)), !.
write_trace_op(guard_class(V, Val, _, L, _)) :-
write(guard_class(V, Val, L)), !.
write_trace_op(enter(L, _, V, M)) :-
write(enter(L, V, M)), !.
write_trace_op(Op) :- write(Op).
summarize_trace([], In, In).
summarize_trace([Op | R], In, Out) :-
Op =.. [Opname | _],
catch(lookup(Opname, In, Num), key_not_found(_), Num = 0),
Num1 is Num + 1,
store(In, Opname, Num1, In1),
summarize_trace(R, In1, Out).
% _______________ run traces _______________
% runtrace_opt(Trace, IState, TraceFromStart) execute a trace Trace in environment Env
% with the full trace being also given as argument TraceFromStart
:- det(runtrace_opt/3).
runtrace_opt([Op | Tail], IState, TraceFromStart) :-
runtrace_opt(Op, Tail, IState, TraceFromStart).
:- det(runtrace_opt/4).
runtrace_opt(op(ResultVar, Op, Arg1, Arg2), Rest, IState, TraceFromStart) :-
interp_op(ResultVar, Op, Arg1, Arg2, IState, NIState),
runtrace_opt(Rest, NIState, TraceFromStart).
runtrace_opt(guard(Arg, C, OState, L, Code), Rest, IState, TraceFromStart) :-
resolve(Arg, IState, Val),
(Val == C ->
runtrace_opt(Rest, IState, TraceFromStart)
;
execute_fallback(OState, IState, NIState),
interp_label(L, Code, NIState)
).
runtrace_opt(new(ResultVar, Class), Rest, IState, TraceFromStart) :-
new_object(ResultVar, Class, IState, NIState),
runtrace_opt(Rest, NIState, TraceFromStart).
runtrace_opt(get(ResultVar, Arg, Field), Rest, IState, TraceFromStart) :-
resolve(Arg, IState, RArg),
get_object(RArg, IState, Obj),
get_field(Obj, Field, Value),
write_env(IState, ResultVar, Value, NIState),
runtrace_opt(Rest, NIState, TraceFromStart).
runtrace_opt(set(Arg, Field, ValueArg), Rest, IState, TraceFromStart) :-
resolve(Arg, IState, Address),
resolve(ValueArg, IState, Value),
set_field(Address, Field, Value, IState, NIState),
runtrace_opt(Rest, NIState, TraceFromStart).
runtrace_opt(guard_class(Arg, Class, OState, L, Code), Rest, IState, TraceFromStart) :-
resolve(Arg, IState, Val),
get_object(Val, IState, obj(Class1, _)),
(Class == Class1 ->
runtrace_opt(Rest, IState, TraceFromStart)
;
execute_fallback(OState, IState, NIState),
interp_label(L, Code, NIState)
).
runtrace_opt(loop(Renames), Rest, IState, TraceFromStart) :-
ensure(Rest == []),
get_env(IState, Env),
execute_phi(Renames, Env, NEnv),
set_env(IState, NEnv, NIState),
runtrace_opt(TraceFromStart, NIState, TraceFromStart).
execute_fallback(OState, IState, NIState) :-
get_env(OState, SSAEnv),
get_stack(OState, ResumeStack),
get_heap(OState, AbsHeap),
get_env(IState, Env),
get_heap(IState, Heap),
get_stack(IState, Stack),
execute_fallback(SSAEnv, ResumeStack, Env, AbsHeap, InterpEnv, Heap, InterpHeap, Stack, InterpStack),
get_result(IState, Res),
interp_state(InterpEnv, InterpHeap, InterpStack, Res, NIState).
execute_fallback(ResumeEnv, ResumeStack, Env, AbsHeap, InterpEnv, Heap, InterpHeap, Stack, InterpStack) :-
execute_fallback(ResumeEnv, Env, NEnv, AbsHeap, NAbsHeap, InterpEnv, Heap, Heap1),
execute_fallback_rebuild_stack(ResumeStack, Stack, InterpStack, NEnv, NAbsHeap, Heap1, InterpHeap).
execute_fallback([], Env, Env, AbsHeap, AbsHeap, [], H, H).
execute_fallback([Var/Val | T], Env, NEnv, AbsHeap, NAbsHeap, [Var/NVal | T1], Heap, NHeap) :-
execute_escape(Val, Env, Env1, AbsHeap, AbsHeap1, Heap, Heap2, NVal),
execute_fallback(T, Env1, NEnv, AbsHeap1, NAbsHeap, T1, Heap2, NHeap).
execute_fallback_rebuild_stack([], Stack, Stack, _Env, _AbsHeap, Heap, Heap).
execute_fallback_rebuild_stack([frame(L, Code, SSAEnv, ResultVar) | T], Stack, [frame(L, Code, InterpEnv, ResultVar) | InterpStack], Env, AbsHeap, Heap, InterpHeap) :-
execute_fallback(SSAEnv, Env, NEnv, AbsHeap, NAbsHeap, InterpEnv, Heap, NHeap),
execute_fallback_rebuild_stack(T, Stack, InterpStack, NEnv, NAbsHeap, NHeap, InterpHeap).
execute_escape(const(C), Env, Env, AbsHeap, AbsHeap, Heap, Heap, C).
execute_escape(var(Var), Env, Env, AbsHeap, AbsHeap, Heap, Heap, Val) :-
maybe_get_object_heap(Var, AbsHeap, not_virtual), !, lookup(Var, Env, Val).
execute_escape(var(Var), Env, NEnv, AbsHeap, NAbsHeap, Heap, NHeap, NewObj) :-
maybe_get_object_heap(Var, AbsHeap, obj(Cls, Fields)),
new_object_heap(Cls, Heap, Heap1, NewObj),
store(Env, Var, NewObj, Env1),
remove_from_env(Var, AbsHeap, AbsHeap1),
execute_escape_fields(Fields, NewObj, Env1, NEnv, AbsHeap1, NAbsHeap, Heap1, NHeap).
execute_escape_fields([], _, Env, Env, AbsHeap, AbsHeap, Heap, Heap).
execute_escape_fields([Field/Value|Rest], Obj, Env, NEnv, AbsHeap, NAbsHeap, Heap, NHeap) :-
execute_escape(Value, Env, Env1, AbsHeap, AbsHeap1, Heap, Heap1, Val),
set_field(Obj, Field, Val, Heap1, Heap2),
execute_escape_fields(Rest, Obj, Env1, NEnv, AbsHeap1, NAbsHeap, Heap2, NHeap).
% _______________ optimization _______________
%
% do_optimize(Trace, Env, OptimizedTrace) optimize a trace Trace, returning
% OptimizedTrace
do_optimize(Trace, Env, OptimizedTrace) :-
initialize_ssa_env(Env, SSAEnv, DefinedVars),
optimize_state(SSAEnv, [], DefinedVars, [], OState),
optimize(Trace, OState, [], OptimizedTrace).
optimize_state(SSAEnv, AbsHeap, DefinedVars, Stack,
ostate(SSAEnv, AbsHeap, DefinedVars, Stack)).
get_definedvars(ostate(_SSAEnv, _AbsHeap, DefinedVars, _Stack), DefinedVars).
get_env(ostate(SSAEnv, _, _, _), SSAEnv).
set_env(ostate(_SSAEnv, AbsHeap, DefinedVars, Stack), NEnv, ostate(NEnv, AbsHeap, DefinedVars, Stack)).
get_heap(ostate(_Env, Heap, _DefinedVars, _Stack), Heap).
set_heap(ostate(Env, _Heap, DefinedVars, Stack), NHeap,
ostate(Env, NHeap, DefinedVars, Stack)).
get_stack(ostate(_Env, _Heap, _DefinedVars, Stack), Stack).
set_stack(ostate(Env, Heap, DefinedVars, _Stack), NStack,
ostate(Env, Heap, DefinedVars, NStack)).
invent_new_var(Var, NewVar) :- gensym(Var, NewVar).
initialize_ssa_env([], [], []).
initialize_ssa_env([Var/_ | Rest1], [Var/var(Var) | Rest2], [Var | Rest3]) :-
initialize_ssa_env(Rest1, Rest2, Rest3).
sresolve(const(X), _OState, const(X)).
sresolve(var(V), OState, X) :-
get_env(OState, SSAEnv), lookup(V, SSAEnv, X).
% optimize(Trace, SSAEnv, DefinedVars, Stack, NewTrace) optimize trace Trace under SSA-environment SSAEnv
execute_phi([], _, []).
execute_phi([Var/Val | T], Env, [Var/NVal | T1]) :-
(Val = const(C) ->
NVal = C
;
Val = var(IVar),
lookup(IVar, Env, NVal)
),
execute_phi(T, Env, T1).
:- det(optimize/4).
optimize([op(ResultVar, Op, Arg1, Arg2) | Rest], OState, Trace, FullTrace) :-
sresolve(Arg1, OState, RArg1),
sresolve(Arg2, OState, RArg2),
(RArg1 = const(C1), RArg2 = const(C2) ->
do_op(Op, C1, C2, Res),
Result = const(Res),
NewTrace = Trace
;
(find_op(Trace, Op, RArg1, RArg2, ResVar) ->
% op is redundant!
Result = var(ResVar),
NewTrace = Trace
;
invent_new_var(ResultVar, SSAVar),
Result = var(SSAVar),
NewTrace = [op(SSAVar, Op, RArg1, RArg2) | Trace]
)
),
write_env(OState, ResultVar, Result, NOState),
optimize(Rest, NOState, NewTrace, FullTrace).
find_op([TOp | T], Op, A1, A2, ResVar) :-
(TOp = op(ResVar, Op, A1, A2) ->
true
;
find_op(T, Op, A1, A2, ResVar)
).
optimize([enter(L, Code, ResultVar, Renames) | Rest], OState, NewTrace, FullTrace) :-
get_env(OState, SSAEnv),
execute_phi(Renames, SSAEnv, NEnv),
set_env(OState, NEnv, OState1),
get_stack(OState1, Stack),
set_stack(OState1, [frame(L, Code, SSAEnv, ResultVar) | Stack], NOState),
optimize(Rest, NOState, NewTrace, FullTrace).
optimize([return(Res) | Rest], OState, NewTrace, FullTrace) :-
get_stack(OState, [frame(_, _, TargetSSAEnv, ResVar)| Stack]),
sresolve(Res, OState, RRes),
store(TargetSSAEnv, ResVar, RRes, NEnv),
set_env(OState, NEnv, OState1),
set_stack(OState1, Stack, NOState),
optimize(Rest, NOState, NewTrace, FullTrace).
optimize([loop], OState, Trace, FullTrace) :-
get_stack(OState, Stack),
ensure(Stack = []),
get_definedvars(OState, DefinedVars),
get_env(OState, SSAEnv),
get_heap(OState, AbsHeap),
phis_and_escapes(DefinedVars, SSAEnv, AbsHeap, PhiNodes, Trace, EscapedTrace),
FullTrace = [loop(PhiNodes) | EscapedTrace].
phis_and_escapes([], _, _, [], Trace, Trace).
phis_and_escapes([Var | Rest], SSAEnv, AbsHeap, [Var/Val | Rest2], Trace, EndTrace) :-
lookup(Var, SSAEnv, Val),
escape(Val, AbsHeap, NHeap, Trace, NewTrace),
phis_and_escapes(Rest, SSAEnv, NHeap, Rest2, NewTrace, EndTrace).
optimize([guard(Arg, C, L, Code) | Rest], OState, Trace, FullTrace) :-
sresolve(Arg, OState, Val),
(Val = const(C1) ->
ensure(C1 = C), % -- otherwise the loop is invalid
NOState = OState,
NewTrace = Trace
;
Arg = var(OrigVar),
write_env(OState, OrigVar, const(C), NOState),
NewTrace = [guard(Val, C, OState, L, Code) | Trace]
),
optimize(Rest, NOState, NewTrace, FullTrace).
% abstract heap maps SSAVar -> obj(Cls, Fields)
% Fields are var(SSAVar) or const(...)
optimize([new(ResultVar, Class) | Rest], OState, Trace, FullTrace) :-
get_heap(OState, AbsHeap),
new_object_heap(Class, AbsHeap, NHeap, NewObj),
set_heap(OState, NHeap, OState1),
write_env(OState1, ResultVar, var(NewObj), NOState),
optimize(Rest, NOState, Trace, FullTrace).
:- det(maybe_get_object/3).
maybe_get_object(Address, OState, Res) :-
get_heap(OState, AbsHeap),
maybe_get_object_heap(Address, AbsHeap, Res).
maybe_get_object_heap(_, [], not_virtual).
maybe_get_object_heap(Address, [Address/Value | _], Res) :- !, Res = Value.
maybe_get_object_heap(Address, [_ | Rest], Value) :- maybe_get_object_heap(Address, Rest, Value).
optimize([get(ResultVar, Arg, Field) | Rest], OState, Trace, FullTrace) :-
sresolve(Arg, OState, RArg),
ensure(RArg = var(Address)),
maybe_get_object(Address, OState, Obj),
(Obj = obj(_, _) ->
get_field(Obj, Field, Value),
NewTrace = Trace
;
ensure(Obj == not_virtual),
invent_new_var(ResultVar, Res),
Value = var(Res),
NewTrace = [get(Res, RArg, Field) | Trace]
),
write_env(OState, ResultVar, Value, NOState),
optimize(Rest, NOState, NewTrace, FullTrace).
optimize([set(Arg, Field, ValueArg) | Rest], OState, Trace, FullTrace) :-
sresolve(Arg, OState, RArg),
ensure(RArg = var(Address)),
sresolve(ValueArg, OState, RValueArg),
maybe_get_object(Address, OState, Obj),
(Obj = obj(_, _) ->
set_field(Address, Field, RValueArg, OState, NOState),
NewTrace = Trace
;
get_heap(OState, AbsHeap),
escape(RValueArg, AbsHeap, NHeap, Trace, Trace2),
set_heap(OState, NHeap, NOState),
NewTrace = [set(RArg, Field, RValueArg) | Trace2]
),
optimize(Rest, NOState, NewTrace, FullTrace).
optimize([guard_class(Arg, Class, L, Code) | Rest], OState, Trace, FullTrace) :-
sresolve(Arg, OState, RArg),
ensure(RArg = var(Address)),
maybe_get_object(Address, OState, Obj),
(Obj = obj(Class1, _), Class = Class1 ->
NOState = OState,
NewTrace = Trace
;
(find_guard_class(Trace, RArg, Class) ->
NOState = OState,
NewTrace = Trace
;
get_heap(OState, AbsHeap),
escape(RArg, AbsHeap, NHeap, Trace, Trace2),
set_heap(OState, NHeap, NOState),
NewTrace = [guard_class(RArg, Class, NOState, L, Code) | Trace2]
)
),
optimize(Rest, NOState, NewTrace, FullTrace).
find_guard_class([TOp | T], Arg, Class) :-
(TOp = guard_class(Arg, Class, _, _, _) ->
true
;
find_guard_class(T, Arg, Clas)
).
escape(const(_), Heap, Heap, Trace, Trace) :- !.
escape(var(X), AbsHeap, NHeap, Trace, NewTrace) :-
maybe_get_object_heap(X, AbsHeap, Obj),
(Obj = obj(Cls, Fields) ->
Trace2 = [new(X, Cls) | Trace],
remove_from_env(X, AbsHeap, AbsHeap1),
escape_fields(Fields, X, AbsHeap1, NHeap, Trace2, NewTrace)
;
NHeap = AbsHeap, Trace = NewTrace
).
escape_fields([], _, AbsHeap, AbsHeap, Trace, Trace).
escape_fields([FieldName/Value | RestFields], X, AbsHeap, NHeap, Trace, NewTrace) :-
escape(Value, AbsHeap, AbsHeap1, Trace, Trace1),
escape_fields(RestFields, X, AbsHeap1, NHeap, [set(var(X), FieldName, Value) | Trace1], NewTrace).
% _______________ example programs _______________
% power computes x ** y
functions([
power/func([x, y], loop, [
power/
op(res, assign, const(1), const(0),
op(c, ge, var(y), const(1),
if(var(c), power_rec, power_done))),
power_rec/
op(res, mul, var(res), var(x),
op(y, sub, var(y), const(1),
op(c, ge, var(y), const(1),
if(var(c), power_rec, power_done)))),
power_done/
return(var(res))
]),
% promotion example
% while i >= 0
% i -= promote(x) * 2 + 1
loop/func([i, x], loop, [
l/
op(c, ge, var(i), const(0),
if(var(c), b, l_done)),
l_done/
return(var(i)),
b/
promote(var(x), b2),
b2/
op(x2, mul, var(x), const(2),
op(x3, add, var(x2), const(1),
op(i, sub, var(i), var(x3),
jump(l))))
]),
% redundant arithmetic ops example
% while i >= 0
% res += i - 1
% i -= 1
redundantloop/func([i, x, res], loop, [
l/
op(c, ge, var(i), const(0),
if(var(c), b, l_done)),
l_done/
return(var(res)),
b/
op(x, sub, var(i), const(1),
op(res, add, var(res), var(x),
op(i, sub, var(i), const(1),
jump(l))))
]),
callloop/func([i, x], loop, [
l/
op(c, ge, var(i), const(0),
if(var(c), b, l_done)),
l_done/
return(var(i)),
b/
call(x3, timestwoplus1, [var(x)], b2),
b2/
op(i, sub, var(i), var(x3),
jump(l))
]),
timestwoplus1/func([arg], noloop, [
start/
op(arg, mul, var(arg), const(2),
op(arg, add, var(arg), const(1),
return(var(arg))))
]),
% arithmetic example
% while i >= 0
% i -= x * 2 + 1
boxedloop/func([startval, xval], loop, [
start/
new(i, int,
set(var(i), value, var(startval),
new(x, int,
set(var(x), value, var(xval),
new(const2, int,
set(var(const2), value, const(2),
new(const1, int,
set(var(const1), value, const(1),
new(const0, int,
set(var(const0), value, const(0),
jump(l))))))))))),
l/
call(c, ge, [var(i), var(const0)], l_ge),
l_ge/
if(var(c), b, l_done),
l_done/
get(ival, var(i), value,
return(var(ival))),
b/
call(x2, mul, [var(x), var(const2)], b_add),
b_add/
call(x2, add, [var(x), var(const1)], b_add0),
b_add0/
% a useless + 0, maybe we can optimize it away
call(x2, add, [var(x2), var(const0)], b_sub),
b_sub/
call(i, sub, [var(i), var(x2)], l),
error/
return(const(-1000))
]),
add/func([a, b], noloop, [
start/
if_class(var(a), int, aint, error),
aint/
if_class(var(b), int, bothint, error),
bothint/
get(aval, var(a), value,
get(bval, var(b), value,
op(resval, add, var(aval), var(bval),
new(res, int,
set(var(res), value, var(resval),
return(var(res))))))),
error/
error(not_int)
]),
sub/func([a, b], noloop, [
start/
if_class(var(a), int, aint, error),
aint/
if_class(var(b), int, bothint, error),
bothint/
get(aval, var(a), value,
get(bval, var(b), value,
op(resval, sub, var(aval), var(bval),
new(res, int,
set(var(res), value, var(resval),
return(var(res))))))),
error/
error(not_int)
]),
ge/func([a, b], noloop, [
start/
if_class(var(a), int, aint, error),