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Extend power of the each form

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This changes the implementation of the `next` function which
is now used to implement each. This let's us iterate over
more types, not just tables and structs.
This commit is contained in:
Calvin Rose 2020-01-18 17:55:07 -06:00
parent 17a2fdbf1b
commit 51678c1aba
10 changed files with 157 additions and 42 deletions
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19
src/boot/boot.janet
View File

@ -333,17 +333,16 @@
(set ,i (,delta ,i ,step))))))
(defn- each-template
[binding in body]
(with-syms [i len]
(def ds (if (idempotent? in) in (gensym)))
[binding inx body]
(with-syms [k]
(def ds (if (idempotent? inx) inx (gensym)))
~(do
(var ,i 0)
,(unless (= ds in) ~(def ,ds ,in))
(def ,len (,length ,ds))
(while (,< ,i ,len)
(def ,binding (in ,ds ,i))
,(unless (= ds inx) ~(def ,ds ,inx))
(var ,k (,next ,ds nil))
(while (,not= nil ,k)
(def ,binding (,in ,ds ,k))
,;body
(++ ,i)))))
(set ,k (,next ,ds ,k))))))
(defn- keys-template
[binding in pair? body]
@ -352,7 +351,7 @@
~(do
,(unless (= ds in) ~(def ,ds ,in))
(var ,k (,next ,ds nil))
(while ,k
(while (,not= nil ,k)
(def ,binding ,(if pair? ~(tuple ,k (in ,ds ,k)) k))
,;body
(set ,k (,next ,ds ,k))))))

3
src/core/asm.c
View File

@ -87,6 +87,8 @@ static const JanetInstructionDef janet_ops[] = {
{"in", JOP_IN},
{"jmp", JOP_JUMP},
{"jmpif", JOP_JUMP_IF},
{"jmpni", JOP_JUMP_IF_NIL},
{"jmpnn", JOP_JUMP_IF_NOT_NIL},
{"jmpno", JOP_JUMP_IF_NOT},
{"ldc", JOP_LOAD_CONSTANT},
{"ldf", JOP_LOAD_FALSE},
@ -110,6 +112,7 @@ static const JanetInstructionDef janet_ops[] = {
{"movn", JOP_MOVE_NEAR},
{"mul", JOP_MULTIPLY},
{"mulim", JOP_MULTIPLY_IMMEDIATE},
{"next", JOP_NEXT},
{"noop", JOP_NOOP},
{"prop", JOP_PROPAGATE},
{"push", JOP_PUSH},

5
src/core/bytecode.c
View File

@ -56,6 +56,8 @@ enum JanetInstructionType janet_instructions[JOP_INSTRUCTION_COUNT] = {
JINT_L, /* JOP_JUMP, */
JINT_SL, /* JOP_JUMP_IF, */
JINT_SL, /* JOP_JUMP_IF_NOT, */
JINT_SL, /* JOP_JUMP_IF_NIL, */
JINT_SL, /* JOP_JUMP_IF_NOT_NIL, */
JINT_SSS, /* JOP_GREATER_THAN, */
JINT_SSI, /* JOP_GREATER_THAN_IMMEDIATE, */
JINT_SSS, /* JOP_LESS_THAN, */
@ -95,7 +97,8 @@ enum JanetInstructionType janet_instructions[JOP_INSTRUCTION_COUNT] = {
JINT_S, /* JOP_MAKE_TUPLE */
JINT_S, /* JOP_MAKE_BRACKET_TUPLE */
JINT_SSS, /* JOP_GREATER_THAN_EQUAL */
JINT_SSS /* JOP_LESS_THAN_EQUAL */
JINT_SSS, /* JOP_LESS_THAN_EQUAL */
JINT_SSS, /* JOP_NEXT */
};
/* Verify some bytecode */

6
src/core/cfuns.c
View File

@ -112,6 +112,9 @@ static JanetSlot do_in(JanetFopts opts, JanetSlot *args) {
static JanetSlot do_get(JanetFopts opts, JanetSlot *args) {
return opreduce(opts, args, JOP_GET, janet_wrap_nil());
}
static JanetSlot do_next(JanetFopts opts, JanetSlot *args) {
return opreduce(opts, args, JOP_NEXT, janet_wrap_nil());
}
static JanetSlot do_put(JanetFopts opts, JanetSlot *args) {
if (opts.flags & JANET_FOPTS_DROP) {
janetc_emit_sss(opts.compiler, JOP_PUT, args[0], args[1], args[2], 0);
@ -283,7 +286,8 @@ static const JanetFunOptimizer optimizers[] = {
{NULL, do_eq},
{NULL, do_neq},
{fixarity2, do_propagate},
{fixarity2, do_get}
{fixarity2, do_get},
{fixarity2, do_next}
};
const JanetFunOptimizer *janetc_funopt(uint32_t flags) {

1
src/core/compile.h
View File

@ -57,6 +57,7 @@
#define JANET_FUN_NEQ 25
#define JANET_FUN_PROP 26
#define JANET_FUN_GET 27
#define JANET_FUN_NEXT 28
/* Compiler typedefs */
typedef struct JanetCompiler JanetCompiler;

35
src/core/corelib.c
View File

@ -427,20 +427,6 @@ static Janet janet_core_type(int32_t argc, Janet *argv) {
}
}
static Janet janet_core_next(int32_t argc, Janet *argv) {
janet_fixarity(argc, 2);
JanetDictView view = janet_getdictionary(argv, 0);
const JanetKV *end = view.kvs + view.cap;
const JanetKV *kv = janet_checktype(argv[1], JANET_NIL)
? view.kvs
: janet_dict_find(view.kvs, view.cap, argv[1]) + 1;
while (kv < end) {
if (!janet_checktype(kv->key, JANET_NIL)) return kv->key;
kv++;
}
return janet_wrap_nil();
}
static Janet janet_core_hash(int32_t argc, Janet *argv) {
janet_fixarity(argc, 1);
return janet_wrap_number(janet_hash(argv[0]));
@ -630,15 +616,6 @@ static const JanetReg corelib_cfuns[] = {
"\t:cfunction\n\n"
"or another symbol for an abstract type.")
},
{
"next", janet_core_next,
JDOC("(next dict &opt key)\n\n"
"Gets the next key in a struct or table. Can be used to iterate through "
"the keys of a data structure in an unspecified order. Keys are guaranteed "
"to be seen only once per iteration if they data structure is not mutated "
"during iteration. If key is nil, next returns the first key. If next "
"returns nil, there are no more keys to iterate through. ")
},
{
"hash", janet_core_hash,
JDOC("(hash value)\n\n"
@ -950,6 +927,10 @@ static const uint32_t propagate_asm[] = {
JOP_PROPAGATE | (1 << 24),
JOP_RETURN
};
static const uint32_t next_asm[] = {
JOP_NEXT | (1 << 24),
JOP_RETURN
};
#endif /* ifdef JANET_BOOTSTRAP */
/*
@ -992,6 +973,14 @@ static void janet_load_libs(JanetTable *env) {
JanetTable *janet_core_env(JanetTable *replacements) {
JanetTable *env = (NULL != replacements) ? replacements : janet_table(0);
janet_quick_asm(env, JANET_FUN_NEXT,
"next", 2, 2, 2, 2, next_asm, sizeof(next_asm),
JDOC("(next ds &opt key)\n\n"
"Gets the next key in a datastructure. Can be used to iterate through "
"the keys of a data structure in an unspecified order. Keys are guaranteed "
"to be seen only once per iteration if they data structure is not mutated "
"during iteration. If key is nil, next returns the first key. If next "
"returns nil, there are no more keys to iterate through."));
janet_quick_asm(env, JANET_FUN_PROP,
"propagate", 2, 2, 2, 2, propagate_asm, sizeof(propagate_asm),
JDOC("(propagate x fiber)\n\n"

38
src/core/specials.c
View File

@ -538,6 +538,20 @@ static JanetSlot janetc_break(JanetFopts opts, int32_t argn, const Janet *argv)
}
}
/* Check if a form matches the pattern (not= nil _) */
static int janetc_check_notnil_form(Janet x, Janet *capture) {
if (!janet_checktype(x, JANET_TUPLE)) return 0;
JanetTuple tup = janet_unwrap_tuple(x);
if (!janet_checktype(tup[0], JANET_FUNCTION)) return 0;
if (3 != janet_tuple_length(tup)) return 0;
JanetFunction *fun = janet_unwrap_function(tup[0]);
uint32_t tag = fun->def->flags & JANET_FUNCDEF_FLAG_TAG;
if (tag != JANET_FUN_NEQ) return 0;
if (!janet_checktype(tup[1], JANET_NIL)) return 0;
*capture = tup[2];
return 1;
}
/*
* :whiletop
* ...
@ -554,6 +568,9 @@ static JanetSlot janetc_while(JanetFopts opts, int32_t argn, const Janet *argv)
JanetScope tempscope;
int32_t labelwt, labeld, labeljt, labelc, i;
int infinite = 0;
int is_notnil_form = 0;
uint8_t ifjmp = JOP_JUMP_IF;
uint8_t ifnjmp = JOP_JUMP_IF_NOT;
if (argn < 2) {
janetc_cerror(c, "expected at least 2 arguments");
@ -564,13 +581,26 @@ static JanetSlot janetc_while(JanetFopts opts, int32_t argn, const Janet *argv)
janetc_scope(&tempscope, c, JANET_SCOPE_WHILE, "while");
/* Check for `(not= nil _)` in condition, and if so, use the
* jmpnl or jmpnn instructions. This let's us implement `(each ...)`
* more efficiently. */
Janet condform = argv[0];
if (janetc_check_notnil_form(condform, &condform)) {
is_notnil_form = 1;
ifjmp = JOP_JUMP_IF_NOT_NIL;
ifnjmp = JOP_JUMP_IF_NIL;
}
/* Compile condition */
cond = janetc_value(subopts, argv[0]);
cond = janetc_value(subopts, condform);
/* Check for constant condition */
if (cond.flags & JANET_SLOT_CONSTANT) {
/* Loop never executes */
if (!janet_truthy(cond.constant)) {
int never_executes = is_notnil_form
? janet_checktype(cond.constant, JANET_NIL)
: !janet_truthy(cond.constant);
if (never_executes) {
janetc_popscope(c);
return janetc_cslot(janet_wrap_nil());
}
@ -581,7 +611,7 @@ static JanetSlot janetc_while(JanetFopts opts, int32_t argn, const Janet *argv)
/* Infinite loop does not need to check condition */
labelc = infinite
? 0
: janetc_emit_si(c, JOP_JUMP_IF_NOT, cond, 0, 0);
: janetc_emit_si(c, ifnjmp, cond, 0, 0);
/* Compile body */
for (i = 1; i < argn; i++) {
@ -603,7 +633,7 @@ static JanetSlot janetc_while(JanetFopts opts, int32_t argn, const Janet *argv)
cond = janetc_value(subopts, argv[0]);
if (!(cond.flags & JANET_SLOT_CONSTANT)) {
/* If not an infinite loop, return nil when condition false */
janetc_emit_si(c, JOP_JUMP_IF, cond, 2, 0);
janetc_emit_si(c, ifjmp, cond, 2, 0);
janetc_emit(c, JOP_RETURN_NIL);
}
for (i = 1; i < argn; i++) {

62
src/core/value.c
View File

@ -22,6 +22,7 @@
#ifndef JANET_AMALG
#include "features.h"
#include "util.h"
#include <janet.h>
#endif
@ -29,6 +30,67 @@
* Define a number of functions that can be used internally on ANY Janet.
*/
Janet janet_next(Janet ds, Janet key) {
JanetType t = janet_type(ds);
switch (t) {
default:
janet_panicf("expected iterable type, got %v", ds);
case JANET_TABLE:
case JANET_STRUCT: {
const JanetKV *start;
int32_t cap;
if (t == JANET_TABLE) {
JanetTable *tab = janet_unwrap_table(ds);
cap = tab->capacity;
start = tab->data;
} else {
JanetStruct st = janet_unwrap_struct(ds);
cap = janet_struct_capacity(st);
start = st;
}
const JanetKV *end = start + cap;
const JanetKV *kv = janet_checktype(key, JANET_NIL)
? start
: janet_dict_find(start, cap, key) + 1;
while (kv < end) {
if (!janet_checktype(kv->key, JANET_NIL)) return kv->key;
kv++;
}
break;
}
case JANET_STRING:
case JANET_KEYWORD:
case JANET_SYMBOL:
case JANET_BUFFER:
case JANET_ARRAY:
case JANET_TUPLE: {
int32_t i;
if (janet_checktype(key, JANET_NIL)) {
i = 0;
} else if (janet_checkint(key)) {
i = janet_unwrap_integer(key) + 1;
} else {
break;
}
int32_t len;
if (t == JANET_BUFFER) {
len = janet_unwrap_buffer(ds)->count;
} else if (t == JANET_ARRAY) {
len = janet_unwrap_array(ds)->count;
} else if (t == JANET_TUPLE) {
len = janet_tuple_length(janet_unwrap_tuple(ds));
} else {
len = janet_string_length(janet_unwrap_string(ds));
}
if (i < len && i >= 0) {
return janet_wrap_integer(i);
}
break;
}
}
return janet_wrap_nil();
}
/* Compare two abstract values */
static int janet_compare_abstract(JanetAbstract xx, JanetAbstract yy) {
if (xx == yy) return 0;

26
src/core/vm.c
View File

@ -264,6 +264,8 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
&&label_JOP_JUMP,
&&label_JOP_JUMP_IF,
&&label_JOP_JUMP_IF_NOT,
&&label_JOP_JUMP_IF_NIL,
&&label_JOP_JUMP_IF_NOT_NIL,
&&label_JOP_GREATER_THAN,
&&label_JOP_GREATER_THAN_IMMEDIATE,
&&label_JOP_LESS_THAN,
@ -304,9 +306,7 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
&&label_JOP_MAKE_BRACKET_TUPLE,
&&label_JOP_GREATER_THAN_EQUAL,
&&label_JOP_LESS_THAN_EQUAL,
&&label_unknown_op,
&&label_unknown_op,
&&label_unknown_op,
&&label_JOP_NEXT,
&&label_unknown_op,
&&label_unknown_op,
&&label_unknown_op,
@ -648,6 +648,22 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
}
vm_next();
VM_OP(JOP_JUMP_IF_NIL)
if (janet_checktype(stack[A], JANET_NIL)) {
pc += ES;
} else {
pc++;
}
vm_next();
VM_OP(JOP_JUMP_IF_NOT_NIL)
if (janet_checktype(stack[A], JANET_NIL)) {
pc++;
} else {
pc += ES;
}
vm_next();
VM_OP(JOP_LESS_THAN)
vm_compop( <);
@ -680,6 +696,10 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
stack[A] = janet_wrap_integer(janet_compare(stack[B], stack[C]));
vm_pcnext();
VM_OP(JOP_NEXT)
stack[A] = janet_next(stack[B], stack[C]);
vm_pcnext();
VM_OP(JOP_LOAD_NIL)
stack[D] = janet_wrap_nil();
vm_pcnext();

4
src/include/janet.h
View File

@ -1020,6 +1020,8 @@ enum JanetOpCode {
JOP_JUMP,
JOP_JUMP_IF,
JOP_JUMP_IF_NOT,
JOP_JUMP_IF_NIL,
JOP_JUMP_IF_NOT_NIL,
JOP_GREATER_THAN,
JOP_GREATER_THAN_IMMEDIATE,
JOP_LESS_THAN,
@ -1060,6 +1062,7 @@ enum JanetOpCode {
JOP_MAKE_BRACKET_TUPLE,
JOP_GREATER_THAN_EQUAL,
JOP_LESS_THAN_EQUAL,
JOP_NEXT,
JOP_INSTRUCTION_COUNT
};
@ -1312,6 +1315,7 @@ JANET_API int janet_compare(Janet x, Janet y);
JANET_API int janet_cstrcmp(JanetString str, const char *other);
JANET_API Janet janet_in(Janet ds, Janet key);
JANET_API Janet janet_get(Janet ds, Janet key);
JANET_API Janet janet_next(Janet ds, Janet key);
JANET_API Janet janet_getindex(Janet ds, int32_t index);
JANET_API int32_t janet_length(Janet x);
JANET_API Janet janet_lengthv(Janet x);