mirror of https://github.com/janet-lang/janet
402 lines
14 KiB
C
402 lines
14 KiB
C
/*
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* Copyright (c) 2021 Calvin Rose
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef JANET_AMALG
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#include "features.h"
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#include <janet.h>
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#include "compile.h"
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#include "emit.h"
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#include "vector.h"
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#endif
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static int arity1or2(JanetFopts opts, JanetSlot *args) {
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(void) opts;
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int32_t arity = janet_v_count(args);
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return arity == 1 || arity == 2;
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}
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static int arity2or3(JanetFopts opts, JanetSlot *args) {
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(void) opts;
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int32_t arity = janet_v_count(args);
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return arity == 2 || arity == 3;
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}
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static int fixarity1(JanetFopts opts, JanetSlot *args) {
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(void) opts;
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return janet_v_count(args) == 1;
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}
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static int maxarity1(JanetFopts opts, JanetSlot *args) {
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(void) opts;
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return janet_v_count(args) <= 1;
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}
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static int minarity2(JanetFopts opts, JanetSlot *args) {
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(void) opts;
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return janet_v_count(args) >= 2;
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}
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static int fixarity2(JanetFopts opts, JanetSlot *args) {
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(void) opts;
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return janet_v_count(args) == 2;
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}
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static int fixarity3(JanetFopts opts, JanetSlot *args) {
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(void) opts;
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return janet_v_count(args) == 3;
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}
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/* Generic handling for $A = op $B */
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static JanetSlot genericSS(JanetFopts opts, int op, JanetSlot s) {
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JanetSlot target = janetc_gettarget(opts);
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janetc_emit_ss(opts.compiler, op, target, s, 1);
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return target;
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}
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/* Generic handling for $A = $B op I */
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static JanetSlot genericSSI(JanetFopts opts, int op, JanetSlot s, int32_t imm) {
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JanetSlot target = janetc_gettarget(opts);
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janetc_emit_ssi(opts.compiler, op, target, s, imm, 1);
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return target;
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}
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/* Emit an insruction that implements a form by itself. */
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static JanetSlot opfunction(
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JanetFopts opts,
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JanetSlot *args,
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int op,
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Janet defaultArg2) {
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JanetCompiler *c = opts.compiler;
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int32_t len;
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len = janet_v_count(args);
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JanetSlot t;
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if (len == 1) {
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t = janetc_gettarget(opts);
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janetc_emit_sss(c, op, t, args[0], janetc_cslot(defaultArg2), 1);
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return t;
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} else {
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/* len == 2 */
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t = janetc_gettarget(opts);
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janetc_emit_sss(c, op, t, args[0], args[1], 1);
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}
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return t;
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}
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/* Check if a value can be coerced to an immediate value */
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static int can_be_imm(Janet x, int8_t *out) {
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if (!janet_checkint(x)) return 0;
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int32_t integer = janet_unwrap_integer(x);
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if (integer > 127 || integer < -127) return 0;
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*out = (int8_t) integer;
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return 1;
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}
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/* Check if a slot can be coerced to an immediate value */
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static int can_slot_be_imm(JanetSlot s, int8_t *out) {
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if (!(s.flags & JANET_SLOT_CONSTANT)) return 0;
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return can_be_imm(s.constant, out);
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}
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/* Emit a series of instructions instead of a function call to a math op */
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static JanetSlot opreduce(
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JanetFopts opts,
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JanetSlot *args,
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int op,
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int opim,
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Janet nullary) {
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JanetCompiler *c = opts.compiler;
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int32_t i, len;
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int8_t imm = 0;
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int neg = opim < 0;
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if (opim < 0) opim = -opim;
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len = janet_v_count(args);
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JanetSlot t;
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if (len == 0) {
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return janetc_cslot(nullary);
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} else if (len == 1) {
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t = janetc_gettarget(opts);
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/* Special case subtract to be times -1 */
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if (op == JOP_SUBTRACT) {
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janetc_emit_ssi(c, JOP_MULTIPLY_IMMEDIATE, t, args[0], -1, 1);
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} else {
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janetc_emit_sss(c, op, t, janetc_cslot(nullary), args[0], 1);
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}
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return t;
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}
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t = janetc_gettarget(opts);
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if (opim && can_slot_be_imm(args[1], &imm)) {
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janetc_emit_ssi(c, opim, t, args[0], neg ? -imm : imm, 1);
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} else {
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janetc_emit_sss(c, op, t, args[0], args[1], 1);
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}
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for (i = 2; i < len; i++) {
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if (opim && can_slot_be_imm(args[i], &imm)) {
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janetc_emit_ssi(c, opim, t, t, neg ? -imm : imm, 1);
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} else {
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janetc_emit_sss(c, op, t, t, args[i], 1);
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}
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}
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return t;
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}
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/* Function optimizers */
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static JanetSlot do_propagate(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_PROPAGATE, 0, janet_wrap_nil());
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}
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static JanetSlot do_error(JanetFopts opts, JanetSlot *args) {
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janetc_emit_s(opts.compiler, JOP_ERROR, args[0], 0);
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return janetc_cslot(janet_wrap_nil());
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}
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static JanetSlot do_debug(JanetFopts opts, JanetSlot *args) {
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(void)args;
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int32_t len = janet_v_count(args);
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JanetSlot t = janetc_gettarget(opts);
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janetc_emit_ssu(opts.compiler, JOP_SIGNAL, t,
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(len == 1) ? args[0] : janetc_cslot(janet_wrap_nil()),
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JANET_SIGNAL_DEBUG,
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1);
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return t;
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}
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static JanetSlot do_in(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_IN, 0, janet_wrap_nil());
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}
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static JanetSlot do_get(JanetFopts opts, JanetSlot *args) {
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if (janet_v_count(args) == 3) {
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JanetCompiler *c = opts.compiler;
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JanetSlot t = janetc_gettarget(opts);
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int target_is_default = janetc_sequal(t, args[2]);
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JanetSlot dflt_slot = args[2];
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if (target_is_default) {
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dflt_slot = janetc_farslot(c);
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janetc_copy(c, dflt_slot, t);
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}
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janetc_emit_sss(c, JOP_GET, t, args[0], args[1], 1);
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int32_t label = janetc_emit_si(c, JOP_JUMP_IF_NOT_NIL, t, 0, 0);
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janetc_copy(c, t, dflt_slot);
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if (target_is_default) janetc_freeslot(c, dflt_slot);
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int32_t current = janet_v_count(c->buffer);
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c->buffer[label] |= (current - label) << 16;
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return t;
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} else {
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return opreduce(opts, args, JOP_GET, 0, janet_wrap_nil());
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}
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}
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static JanetSlot do_next(JanetFopts opts, JanetSlot *args) {
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return opfunction(opts, args, JOP_NEXT, janet_wrap_nil());
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}
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static JanetSlot do_modulo(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_MODULO, 0, janet_wrap_nil());
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}
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static JanetSlot do_remainder(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_REMAINDER, 0, janet_wrap_nil());
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}
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static JanetSlot do_cmp(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_COMPARE, 0, janet_wrap_nil());
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}
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static JanetSlot do_put(JanetFopts opts, JanetSlot *args) {
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if (opts.flags & JANET_FOPTS_DROP) {
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janetc_emit_sss(opts.compiler, JOP_PUT, args[0], args[1], args[2], 0);
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return janetc_cslot(janet_wrap_nil());
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} else {
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JanetSlot t = janetc_gettarget(opts);
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janetc_copy(opts.compiler, t, args[0]);
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janetc_emit_sss(opts.compiler, JOP_PUT, t, args[1], args[2], 0);
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return t;
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}
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}
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static JanetSlot do_length(JanetFopts opts, JanetSlot *args) {
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return genericSS(opts, JOP_LENGTH, args[0]);
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}
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static JanetSlot do_yield(JanetFopts opts, JanetSlot *args) {
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if (janet_v_count(args) == 0) {
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return genericSSI(opts, JOP_SIGNAL, janetc_cslot(janet_wrap_nil()), 3);
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} else {
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return genericSSI(opts, JOP_SIGNAL, args[0], 3);
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}
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}
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static JanetSlot do_resume(JanetFopts opts, JanetSlot *args) {
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return opfunction(opts, args, JOP_RESUME, janet_wrap_nil());
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}
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static JanetSlot do_cancel(JanetFopts opts, JanetSlot *args) {
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return opfunction(opts, args, JOP_CANCEL, janet_wrap_nil());
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}
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static JanetSlot do_apply(JanetFopts opts, JanetSlot *args) {
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/* Push phase */
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JanetCompiler *c = opts.compiler;
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int32_t i;
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for (i = 1; i < janet_v_count(args) - 3; i += 3)
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janetc_emit_sss(c, JOP_PUSH_3, args[i], args[i + 1], args[i + 2], 0);
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if (i == janet_v_count(args) - 3)
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janetc_emit_ss(c, JOP_PUSH_2, args[i], args[i + 1], 0);
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else if (i == janet_v_count(args) - 2)
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janetc_emit_s(c, JOP_PUSH, args[i], 0);
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/* Push array phase */
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janetc_emit_s(c, JOP_PUSH_ARRAY, janet_v_last(args), 0);
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/* Call phase */
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JanetSlot target;
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if (opts.flags & JANET_FOPTS_TAIL) {
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janetc_emit_s(c, JOP_TAILCALL, args[0], 0);
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target = janetc_cslot(janet_wrap_nil());
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target.flags |= JANET_SLOT_RETURNED;
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} else {
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target = janetc_gettarget(opts);
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janetc_emit_ss(c, JOP_CALL, target, args[0], 1);
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}
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return target;
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}
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/* Variadic operators specialization */
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static JanetSlot do_add(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_ADD, JOP_ADD_IMMEDIATE, janet_wrap_integer(0));
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}
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static JanetSlot do_sub(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_SUBTRACT, -JOP_ADD_IMMEDIATE, janet_wrap_integer(0));
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}
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static JanetSlot do_mul(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_MULTIPLY, JOP_MULTIPLY_IMMEDIATE, janet_wrap_integer(1));
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}
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static JanetSlot do_div(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_DIVIDE, JOP_DIVIDE_IMMEDIATE, janet_wrap_integer(1));
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}
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static JanetSlot do_band(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_BAND, 0, janet_wrap_integer(-1));
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}
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static JanetSlot do_bor(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_BOR, 0, janet_wrap_integer(0));
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}
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static JanetSlot do_bxor(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_BXOR, 0, janet_wrap_integer(0));
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}
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static JanetSlot do_lshift(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_SHIFT_LEFT, JOP_SHIFT_LEFT_IMMEDIATE, janet_wrap_integer(1));
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}
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static JanetSlot do_rshift(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_SHIFT_RIGHT, JOP_SHIFT_RIGHT_IMMEDIATE, janet_wrap_integer(1));
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}
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static JanetSlot do_rshiftu(JanetFopts opts, JanetSlot *args) {
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return opreduce(opts, args, JOP_SHIFT_RIGHT_UNSIGNED, JOP_SHIFT_RIGHT_UNSIGNED_IMMEDIATE, janet_wrap_integer(1));
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}
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static JanetSlot do_bnot(JanetFopts opts, JanetSlot *args) {
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return genericSS(opts, JOP_BNOT, args[0]);
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}
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/* Specialization for comparators */
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static JanetSlot compreduce(
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JanetFopts opts,
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JanetSlot *args,
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int op,
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int opim,
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int invert) {
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JanetCompiler *c = opts.compiler;
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int32_t i, len;
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int8_t imm = 0;
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len = janet_v_count(args);
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int32_t *labels = NULL;
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JanetSlot t;
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if (len < 2) {
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return invert
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? janetc_cslot(janet_wrap_false())
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: janetc_cslot(janet_wrap_true());
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}
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t = janetc_gettarget(opts);
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for (i = 1; i < len; i++) {
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if (opim && can_slot_be_imm(args[i], &imm)) {
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janetc_emit_ssi(c, opim, t, args[i - 1], imm, 1);
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} else {
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janetc_emit_sss(c, op, t, args[i - 1], args[i], 1);
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}
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if (i != (len - 1)) {
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int32_t label = janetc_emit_si(c, invert ? JOP_JUMP_IF : JOP_JUMP_IF_NOT, t, 0, 1);
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janet_v_push(labels, label);
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}
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}
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int32_t end = janet_v_count(c->buffer);
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for (i = 0; i < janet_v_count(labels); i++) {
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int32_t label = labels[i];
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c->buffer[label] |= ((end - label) << 16);
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}
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janet_v_free(labels);
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return t;
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}
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static JanetSlot do_gt(JanetFopts opts, JanetSlot *args) {
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return compreduce(opts, args, JOP_GREATER_THAN, JOP_GREATER_THAN_IMMEDIATE, 0);
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}
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static JanetSlot do_lt(JanetFopts opts, JanetSlot *args) {
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return compreduce(opts, args, JOP_LESS_THAN, JOP_LESS_THAN_IMMEDIATE, 0);
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}
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static JanetSlot do_gte(JanetFopts opts, JanetSlot *args) {
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return compreduce(opts, args, JOP_GREATER_THAN_EQUAL, 0, 0);
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}
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static JanetSlot do_lte(JanetFopts opts, JanetSlot *args) {
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return compreduce(opts, args, JOP_LESS_THAN_EQUAL, 0, 0);
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}
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static JanetSlot do_eq(JanetFopts opts, JanetSlot *args) {
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return compreduce(opts, args, JOP_EQUALS, JOP_EQUALS_IMMEDIATE, 0);
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}
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static JanetSlot do_neq(JanetFopts opts, JanetSlot *args) {
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return compreduce(opts, args, JOP_NOT_EQUALS, JOP_NOT_EQUALS_IMMEDIATE, 1);
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}
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/* Arranged by tag */
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static const JanetFunOptimizer optimizers[] = {
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{maxarity1, do_debug},
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{fixarity1, do_error},
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{minarity2, do_apply},
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{maxarity1, do_yield},
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{arity1or2, do_resume},
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{fixarity2, do_in},
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{fixarity3, do_put},
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{fixarity1, do_length},
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{NULL, do_add},
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{NULL, do_sub},
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{NULL, do_mul},
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{NULL, do_div},
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{NULL, do_band},
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{NULL, do_bor},
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{NULL, do_bxor},
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{NULL, do_lshift},
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{NULL, do_rshift},
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{NULL, do_rshiftu},
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{fixarity1, do_bnot},
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{NULL, do_gt},
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{NULL, do_lt},
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{NULL, do_gte},
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{NULL, do_lte},
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{NULL, do_eq},
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{NULL, do_neq},
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{fixarity2, do_propagate},
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{arity2or3, do_get},
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{arity1or2, do_next},
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{fixarity2, do_modulo},
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{fixarity2, do_remainder},
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{fixarity2, do_cmp},
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{fixarity2, do_cancel},
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};
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const JanetFunOptimizer *janetc_funopt(uint32_t flags) {
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uint32_t tag = flags & JANET_FUNCDEF_FLAG_TAG;
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if (tag == 0)
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return NULL;
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uint32_t index = tag - 1;
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if (index >= (sizeof(optimizers) / sizeof(optimizers[0])))
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return NULL;
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return optimizers + index;
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}
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