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mirror of https://github.com/janet-lang/janet synced 2024-12-25 07:50:27 +00:00
janet/core/compile_specials.c
2018-01-13 16:14:40 -05:00

547 lines
18 KiB
C

/*
* Copyright (c) 2017 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <dst/dst.h>
#include <dst/dststl.h>
#include "compile.h"
#include "gc.h"
#include "sourcemap.h"
#include "util.h"
DstSlot dstc_quote(DstFopts opts, int32_t argn, const Dst *argv) {
if (argn != 1) {
dstc_cerror(opts.compiler, opts.sourcemap, "expected 1 argument");
return dstc_cslot(dst_wrap_nil());
}
return dstc_cslot(argv[0]);
}
DstSlot dstc_varset(DstFopts opts, int32_t argn, const Dst *argv) {
DstFopts subopts;
DstSlot ret, dest;
if (argn != 2) {
dstc_cerror(opts.compiler, opts.sourcemap, "expected 2 arguments");
return dstc_cslot(dst_wrap_nil());
}
if (!dst_checktype(argv[0], DST_SYMBOL)) {
dstc_cerror(opts.compiler, opts.sourcemap, "expected symbol");
return dstc_cslot(dst_wrap_nil());
}
dest = dstc_resolve(opts.compiler, opts.sourcemap, dst_unwrap_symbol(argv[0]));
if (!(dest.flags & DST_SLOT_MUTABLE)) {
dstc_cerror(opts.compiler, opts.sourcemap, "cannot set constant");
return dstc_cslot(dst_wrap_nil());
}
subopts = dstc_getindex(opts, 2);
subopts.flags = DST_FOPTS_HINT;
subopts.hint = dest;
ret = dstc_value(subopts);
dstc_copy(opts.compiler, subopts.sourcemap, dest, ret);
return ret;
}
/* Add attributes to a global def or var table */
static void handleattr(DstFopts opts, int32_t argn, const Dst *argv, DstTable *tab) {
int32_t i;
for (i = 1; i < argn - 1; i++) {
Dst attr = argv[i];
DstFopts subopts = dstc_getindex(opts, i + 1);
switch (dst_type(attr)) {
default:
dstc_cerror(opts.compiler, subopts.sourcemap, "could not add meta data to def");
return;
case DST_SYMBOL:
dst_table_put(tab, attr, dst_wrap_true());
break;
case DST_STRING:
dst_table_put(tab, dst_csymbolv("doc"), attr);
break;
}
}
}
DstSlot dstc_var(DstFopts opts, int32_t argn, const Dst *argv) {
DstCompiler *c = opts.compiler;
DstFopts subopts;
DstSlot ret;
if (argn < 2) {
dstc_cerror(opts.compiler, opts.sourcemap, "expected at least 2 arguments");
return dstc_cslot(dst_wrap_nil());
}
if (!dst_checktype(argv[0], DST_SYMBOL)) {
dstc_cerror(opts.compiler, opts.sourcemap, "expected symbol");
return dstc_cslot(dst_wrap_nil());
}
subopts = dstc_getindex(opts, argn);
subopts.flags = opts.flags & ~DST_FOPTS_TAIL;
ret = dstc_value(subopts);
if (dst_v_last(c->scopes).flags & DST_SCOPE_TOP) {
DstCompiler *c = opts.compiler;
const Dst *sm = opts.sourcemap;
DstSlot refslot, refarrayslot;
/* Global var, generate var */
DstTable *reftab = dst_table(1);
DstArray *ref = dst_array(1);
dst_array_push(ref, dst_wrap_nil());
dst_table_put(reftab, dst_csymbolv("ref"), dst_wrap_array(ref));
handleattr(opts, argn, argv, reftab);
dst_put(opts.compiler->env, argv[0], dst_wrap_table(reftab));
refslot = dstc_cslot(dst_wrap_array(ref));
refarrayslot = refslot;
refslot.flags |= DST_SLOT_REF | DST_SLOT_NAMED | DST_SLOT_MUTABLE;
/* Generate code to set ref */
int32_t refarrayindex = dstc_preread(c, sm, 0xFF, 1, refarrayslot);
int32_t retindex = dstc_preread(c, sm, 0xFF, 2, ret);
dstc_emit(c, sm,
(retindex << 16) |
(refarrayindex << 8) |
DOP_PUT_INDEX);
dstc_postread(c, refarrayslot, refarrayindex);
dstc_postread(c, ret, retindex);
/*dstc_freeslot(c, refarrayslot);*/
ret = refslot;
} else {
/* Non root scope, bring to local slot */
if (ret.flags & DST_SLOT_NAMED ||
ret.envindex != 0 ||
ret.index < 0 ||
ret.index > 0xFF) {
/* Slot is not able to be named */
DstSlot localslot;
localslot.index = dstc_lsloti(c);
/* infer type? */
localslot.flags = DST_SLOT_NAMED | DST_SLOT_MUTABLE;
localslot.envindex = 0;
localslot.constant = dst_wrap_nil();
dstc_copy(opts.compiler, opts.sourcemap, localslot, ret);
ret = localslot;
}
dstc_nameslot(c, dst_unwrap_symbol(argv[0]), ret);
}
return ret;
}
DstSlot dstc_def(DstFopts opts, int32_t argn, const Dst *argv) {
DstCompiler *c = opts.compiler;
const Dst *sm = opts.sourcemap;
DstFopts subopts;
DstSlot ret;
if (argn < 2) {
dstc_cerror(opts.compiler, opts.sourcemap, "expected at least 2 arguments");
return dstc_cslot(dst_wrap_nil());
}
if (!dst_checktype(argv[0], DST_SYMBOL)) {
dstc_cerror(opts.compiler, opts.sourcemap, "expected symbol");
return dstc_cslot(dst_wrap_nil());
}
subopts = dstc_getindex(opts, argn);
subopts.flags &= ~DST_FOPTS_TAIL;
ret = dstc_value(subopts);
ret.flags |= DST_SLOT_NAMED;
if (dst_v_last(c->scopes).flags & DST_SCOPE_TOP) {
DstTable *tab = dst_table(2);
int32_t tableindex, valsymindex, valueindex;
DstSlot valsym = dstc_cslot(dst_csymbolv("value"));
DstSlot tabslot = dstc_cslot(dst_wrap_table(tab));
/* Add env entry to env */
handleattr(opts, argn, argv, tab);
dst_put(c->env, argv[0], dst_wrap_table(tab));
/* Put value in table when evaulated */
tableindex = dstc_preread(c, sm, 0xFF, 1, tabslot);
valsymindex = dstc_preread(c, sm, 0xFF, 2, valsym);
valueindex = dstc_preread(c, sm, 0xFF, 3, ret);
dstc_emit(c, sm,
(valueindex << 24) |
(valsymindex << 16) |
(tableindex << 8) |
DOP_PUT);
dstc_postread(c, tabslot, tableindex);
dstc_postread(c, valsym, valsymindex);
dstc_postread(c, ret, valueindex);
} else {
/* Non root scope, simple slot alias */
dstc_nameslot(c, dst_unwrap_symbol(argv[0]), ret);
}
return ret;
}
/*
* :condition
* ...
* jump-if-not condition :right
* :left
* ...
* jump done (only if not tail)
* :right
* ...
* :done
*/
DstSlot dstc_if(DstFopts opts, int32_t argn, const Dst *argv) {
DstCompiler *c = opts.compiler;
const Dst *sm = opts.sourcemap;
int32_t labelr, labeljr, labeld, labeljd, condlocal;
DstFopts leftopts, rightopts, condopts;
DstSlot cond, left, right, target;
const int tail = opts.flags & DST_FOPTS_TAIL;
const int drop = opts.flags & DST_FOPTS_DROP;
(void) argv;
if (argn < 2 || argn > 3) {
dstc_cerror(c, sm, "expected 2 or 3 arguments to if");
return dstc_cslot(dst_wrap_nil());
}
/* Get options */
condopts = dstc_getindex(opts, 1);
leftopts = dstc_getindex(opts, 2);
rightopts = dstc_getindex(opts, 3);
if (argn == 2) rightopts.sourcemap = opts.sourcemap;
if (opts.flags & DST_FOPTS_HINT) {
leftopts.flags |= DST_FOPTS_HINT;
rightopts.flags |= DST_FOPTS_HINT;
}
if (tail) {
leftopts.flags |= DST_FOPTS_TAIL;
rightopts.flags |= DST_FOPTS_TAIL;
}
if (drop) {
leftopts.flags |= DST_FOPTS_DROP;
rightopts.flags |= DST_FOPTS_DROP;
}
/* Compile condition */
cond = dstc_value(condopts);
/* Check constant condition. */
/* TODO: Use type info for more short circuits */
if ((cond.flags & DST_SLOT_CONSTANT) && !(cond.flags & DST_SLOT_REF)) {
DstFopts goodopts, badopts;
if (dst_truthy(cond.constant)) {
goodopts = leftopts;
badopts = rightopts;
} else {
goodopts = rightopts;
badopts = leftopts;
}
dstc_scope(c, 0);
target = dstc_value(goodopts);
dstc_popscope(c);
dstc_throwaway(badopts);
return target;
}
/* Set target for compilation */
target = (!drop && !tail)
? dstc_gettarget(opts)
: dstc_cslot(dst_wrap_nil());
/* Compile jump to right */
condlocal = dstc_preread(c, sm, 0xFF, 1, cond);
labeljr = dst_v_count(c->buffer);
dstc_emit(c, sm, DOP_JUMP_IF_NOT | (condlocal << 8));
dstc_postread(c, cond, condlocal);
dstc_freeslot(c, cond);
/* Condition left body */
dstc_scope(c, 0);
left = dstc_value(leftopts);
if (!drop && !tail) dstc_copy(c, sm, target, left);
dstc_popscope(c);
/* Compile jump to done */
labeljd = dst_v_count(c->buffer);
if (!tail) dstc_emit(c, sm, DOP_JUMP);
/* Compile right body */
labelr = dst_v_count(c->buffer);
dstc_scope(c, 0);
right = dstc_value(rightopts);
if (!drop && !tail) dstc_copy(c, sm, target, right);
dstc_popscope(c);
/* Write jumps - only add jump lengths if jump actually emitted */
labeld = dst_v_count(c->buffer);
c->buffer[labeljr] |= (labelr - labeljr) << 16;
if (!tail) c->buffer[labeljd] |= (labeld - labeljd) << 8;
if (tail) target.flags |= DST_SLOT_RETURNED;
return target;
}
/* Compile a do form. Do forms execute their body sequentially and
* evaluate to the last expression in the body. */
DstSlot dstc_do(DstFopts opts, int32_t argn, const Dst *argv) {
int32_t i;
DstSlot ret;
dstc_scope(opts.compiler, 0);
(void) argv;
for (i = 0; i < argn; i++) {
DstFopts subopts = dstc_getindex(opts, i + 1);
if (i != argn - 1) {
subopts.flags = DST_FOPTS_DROP;
} else if (opts.flags & DST_FOPTS_TAIL) {
subopts.flags = DST_FOPTS_TAIL;
}
ret = dstc_value(subopts);
if (i != argn - 1) {
dstc_freeslot(opts.compiler, ret);
}
}
dstc_popscope(opts.compiler);
return ret;
}
DstSlot dstc_transfer(DstFopts opts, int32_t argn, const Dst *argv) {
DstCompiler *c = opts.compiler;
const Dst *sm = opts.sourcemap;
DstSlot dest, fib, val;
int32_t destindex, fibindex, valindex;
(void) argv;
if (argn > 2) {
dstc_cerror(c, sm, "expected no more than 2 arguments");
return dstc_cslot(dst_wrap_nil());
}
dest = dstc_gettarget(opts);
fib = (argn > 0) ? dstc_value(dstc_getindex(opts, 1)) : dstc_cslot(dst_wrap_nil());
val = (argn > 1) ? dstc_value(dstc_getindex(opts, 2)) : dstc_cslot(dst_wrap_nil());
destindex = dstc_preread(c, sm, 0xFF, 1, dest);
fibindex = dstc_preread(c, sm, 0xFF, 2, fib);
valindex = dstc_preread(c, sm, 0xFF, 3, val);
dstc_emit(c, sm,
(valindex << 24) |
(fibindex << 16) |
(destindex << 8) |
DOP_TRANSFER);
dstc_postread(c, dest, destindex);
dstc_postread(c, fib, fibindex);
dstc_postread(c, val, valindex);
dstc_freeslot(c, fib);
dstc_freeslot(c, val);
return dest;
}
/*
* :whiletop
* ...
* :condition
* jump-if-not cond :done
* ...
* jump :whiletop
* :done
*/
DstSlot dstc_while(DstFopts opts, int32_t argn, const Dst *argv) {
DstCompiler *c = opts.compiler;
const Dst *sm = opts.sourcemap;
DstSlot cond;
int32_t condlocal, labelwt, labeld, labeljt, labelc, i;
int infinite = 0;
(void) argv;
if (argn < 2) {
dstc_cerror(c, sm, "expected at least 2 arguments");
return dstc_cslot(dst_wrap_nil());
}
labelwt = dst_v_count(c->buffer);
/* Compile condition */
cond = dstc_value(dstc_getindex(opts, 1));
/* Check for constant condition */
if (cond.flags & DST_SLOT_CONSTANT) {
/* Loop never executes */
if (!dst_truthy(cond.constant)) {
return dstc_cslot(dst_wrap_nil());
}
/* Infinite loop */
infinite = 1;
}
dstc_scope(c, 0);
/* Infinite loop does not need to check condition */
if (!infinite) {
condlocal = dstc_preread(c, sm, 0xFF, 1, cond);
labelc = dst_v_count(c->buffer);
dstc_emit(c, sm, DOP_JUMP_IF_NOT | (condlocal << 8));
dstc_postread(c, cond, condlocal);
}
/* Compile body */
for (i = 1; i < argn; i++) {
DstFopts subopts = dstc_getindex(opts, i + 1);
subopts.flags = DST_FOPTS_DROP;
dstc_freeslot(c, dstc_value(subopts));
}
/* Compile jump to whiletop */
labeljt = dst_v_count(c->buffer);
dstc_emit(c, sm, DOP_JUMP);
/* Calculate jumps */
labeld = dst_v_count(c->buffer);
if (!infinite) c->buffer[labelc] |= (labeld - labelc) << 16;
c->buffer[labeljt] |= (labelwt - labeljt) << 8;
/* Pop scope and return nil slot */
dstc_popscope(opts.compiler);
return dstc_cslot(dst_wrap_nil());
}
/* Add a funcdef to the top most function scope */
static int32_t dstc_addfuncdef(DstCompiler *c, DstFuncDef *def) {
DstScope *scope = &dst_v_last(c->scopes);
while (scope >= c->scopes) {
if (scope->flags & DST_SCOPE_FUNCTION)
break;
scope--;
}
dst_assert(scope >= c->scopes, "could not add funcdef");
dst_v_push(scope->defs, def);
return dst_v_count(scope->defs) - 1;
}
DstSlot dstc_fn(DstFopts opts, int32_t argn, const Dst *argv) {
DstCompiler *c = opts.compiler;
const Dst *sm = opts.sourcemap;
DstFuncDef *def;
DstSlot ret;
int32_t paramcount, argi, parami, arity, localslot, defindex;
const Dst *params;
const Dst *psm;
int varargs = 0;
if (argn < 2) {
dstc_cerror(c, sm, "expected at least 2 arguments to function literal");
return dstc_cslot(dst_wrap_nil());
}
/* Begin function */
dstc_scope(c, DST_SCOPE_FUNCTION);
/* Read function parameters */
parami = 0;
arity = 0;
if (dst_checktype(argv[0], DST_SYMBOL)) parami = 1;
if (parami >= argn) {
dstc_cerror(c, sm, "expected function parameters");
return dstc_cslot(dst_wrap_nil());
}
if (dst_seq_view(argv[parami], &params, &paramcount)) {
psm = dst_sourcemap_index(sm, parami + 1);
int32_t i;
for (i = 0; i < paramcount; i++) {
const Dst *psmi = dst_sourcemap_index(psm, i);
if (dst_checktype(params[i], DST_SYMBOL)) {
DstSlot slot;
/* Check for varargs */
if (0 == dst_cstrcmp(dst_unwrap_symbol(params[i]), "&")) {
if (i != paramcount - 2) {
dstc_cerror(c, psmi, "variable argument symbol in unexpected location");
return dstc_cslot(dst_wrap_nil());
}
varargs = 1;
arity--;
continue;
}
slot.flags = DST_SLOT_NAMED;
slot.envindex = 0;
slot.constant = dst_wrap_nil();
slot.index = dstc_lsloti(c);
dstc_nameslot(c, dst_unwrap_symbol(params[i]), slot);
arity++;
} else {
dstc_cerror(c, psmi, "expected symbol as function parameter");
return dstc_cslot(dst_wrap_nil());
}
}
} else {
dstc_cerror(c, sm, "expected function parameters");
return dstc_cslot(dst_wrap_nil());
}
/* Compile function body */
for (argi = parami + 1; argi < argn; argi++) {
DstSlot s;
DstFopts subopts = dstc_getindex(opts, argi + 1);
subopts.flags = argi == (argn - 1) ? DST_FOPTS_TAIL : DST_FOPTS_DROP;
s = dstc_value(subopts);
dstc_freeslot(c, s);
}
/* Build function */
def = dstc_pop_funcdef(c);
def->arity = arity;
if (varargs) def->flags |= DST_FUNCDEF_FLAG_VARARG;
defindex = dstc_addfuncdef(c, def);
/* Ensure enough slots for vararg function. */
if (arity + varargs > def->slotcount) def->slotcount = arity + varargs;
/* Instantiate closure */
ret.flags = 0;
ret.envindex = 0;
ret.constant = dst_wrap_nil();
ret.index = dstc_lsloti(c);
localslot = ret.index > 0xF0 ? 0xF1 : ret.index;
dstc_emit(c, sm,
(defindex << 16) |
(localslot << 8) |
DOP_CLOSURE);
if (ret.index != localslot) {
dstc_emit(c, sm,
(ret.index << 16) |
(localslot << 8) |
DOP_MOVE_FAR);
}
return ret;
}
/* Keep in lexographic order */
static const DstSpecial dstc_specials[] = {
{"def", dstc_def},
{"do", dstc_do},
{"fn", dstc_fn},
{"if", dstc_if},
{"quote", dstc_quote},
{"transfer", dstc_transfer},
{"var", dstc_var},
{"varset!", dstc_varset},
{"while", dstc_while}
};
/* Find a special */
const DstSpecial *dstc_special(const uint8_t *name) {
return dst_strbinsearch(
&dstc_specials,
sizeof(dstc_specials)/sizeof(DstSpecial),
sizeof(DstSpecial),
name);
}