picrin/extlib/benz/codegen.c

1073 lines
27 KiB
C

/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
/**
* macro expander
*/
static pic_sym *
lookup(pic_state PIC_UNUSED(*pic), pic_value var, struct pic_env *env)
{
khiter_t it;
pic_assert_type(pic, var, var);
while (env != NULL) {
it = kh_get(env, &env->map, pic_ptr(var));
if (it != kh_end(&env->map)) {
return kh_val(&env->map, it);
}
env = env->up;
}
return NULL;
}
pic_sym *
pic_resolve(pic_state *pic, pic_value var, struct pic_env *env)
{
pic_sym *uid;
assert(env != NULL);
pic_assert_type(pic, var, var);
while ((uid = lookup(pic, var, env)) == NULL) {
if (pic_sym_p(var)) {
break;
}
env = pic_id_ptr(var)->env;
var = pic_id_ptr(var)->var;
}
if (uid == NULL) {
while (env->up != NULL) {
env = env->up;
}
uid = pic_add_variable(pic, env, var);
}
return uid;
}
static void
define_macro(pic_state *pic, pic_sym *uid, struct pic_proc *mac)
{
if (pic_dict_has(pic, pic->macros, uid)) {
pic_warnf(pic, "redefining syntax variable: ~s", pic_obj_value(uid));
}
pic_dict_set(pic, pic->macros, uid, pic_obj_value(mac));
}
static struct pic_proc *
find_macro(pic_state *pic, pic_sym *uid)
{
if (! pic_dict_has(pic, pic->macros, uid)) {
return NULL;
}
return pic_proc_ptr(pic_dict_ref(pic, pic->macros, uid));
}
static void
shadow_macro(pic_state *pic, pic_sym *uid)
{
if (pic_dict_has(pic, pic->macros, uid)) {
pic_dict_del(pic, pic->macros, uid);
}
}
static pic_value expand(pic_state *, pic_value, struct pic_env *, pic_value);
static pic_value expand_lambda(pic_state *, pic_value, struct pic_env *);
static pic_value
expand_var(pic_state *pic, pic_value var, struct pic_env *env, pic_value deferred)
{
struct pic_proc *mac;
pic_sym *functor;
functor = pic_resolve(pic, var, env);
if ((mac = find_macro(pic, functor)) != NULL) {
return expand(pic, pic_apply2(pic, mac, var, pic_obj_value(env)), env, deferred);
}
return pic_obj_value(functor);
}
static pic_value
expand_quote(pic_state *pic, pic_value expr)
{
return pic_cons(pic, pic_obj_value(pic->uQUOTE), pic_cdr(pic, expr));
}
static pic_value
expand_list(pic_state *pic, pic_value obj, struct pic_env *env, pic_value deferred)
{
size_t ai = pic_gc_arena_preserve(pic);
pic_value x, head, tail;
if (pic_pair_p(obj)) {
head = expand(pic, pic_car(pic, obj), env, deferred);
tail = expand_list(pic, pic_cdr(pic, obj), env, deferred);
x = pic_cons(pic, head, tail);
} else {
x = expand(pic, obj, env, deferred);
}
pic_gc_arena_restore(pic, ai);
pic_gc_protect(pic, x);
return x;
}
static pic_value
expand_defer(pic_state *pic, pic_value expr, pic_value deferred)
{
pic_value skel = pic_cons(pic, pic_invalid_value(), pic_invalid_value());
pic_set_car(pic, deferred, pic_acons(pic, expr, skel, pic_car(pic, deferred)));
return skel;
}
static void
expand_deferred(pic_state *pic, pic_value deferred, struct pic_env *env)
{
pic_value defer, val, src, dst, it;
deferred = pic_car(pic, deferred);
pic_for_each (defer, pic_reverse(pic, deferred), it) {
src = pic_car(pic, defer);
dst = pic_cdr(pic, defer);
val = expand_lambda(pic, src, env);
/* copy */
pic_set_car(pic, dst, pic_car(pic, val));
pic_set_cdr(pic, dst, pic_cdr(pic, val));
}
}
static pic_value
expand_lambda(pic_state *pic, pic_value expr, struct pic_env *env)
{
pic_value formal, body;
struct pic_env *in;
pic_value a, deferred;
in = pic_make_env(pic, env);
for (a = pic_cadr(pic, expr); pic_pair_p(a); a = pic_cdr(pic, a)) {
pic_add_variable(pic, in, pic_car(pic, a));
}
if (pic_var_p(a)) {
pic_add_variable(pic, in, a);
}
deferred = pic_list1(pic, pic_nil_value());
formal = expand_list(pic, pic_list_ref(pic, expr, 1), in, deferred);
body = expand(pic, pic_list_ref(pic, expr, 2), in, deferred);
expand_deferred(pic, deferred, in);
return pic_list3(pic, pic_obj_value(pic->uLAMBDA), formal, body);
}
static pic_value
expand_define(pic_state *pic, pic_value expr, struct pic_env *env, pic_value deferred)
{
pic_sym *uid;
pic_value var, val;
var = pic_cadr(pic, expr);
if ((uid = pic_find_variable(pic, env, var)) == NULL) {
uid = pic_add_variable(pic, env, var);
} else {
shadow_macro(pic, uid);
}
val = expand(pic, pic_list_ref(pic, expr, 2), env, deferred);
return pic_list3(pic, pic_obj_value(pic->uDEFINE), pic_obj_value(uid), val);
}
static pic_value
expand_defmacro(pic_state *pic, pic_value expr, struct pic_env *env)
{
pic_value var, val;
pic_sym *uid;
var = pic_cadr(pic, expr);
if ((uid = pic_find_variable(pic, env, var)) == NULL) {
uid = pic_add_variable(pic, env, var);
}
val = pic_eval(pic, pic_list_ref(pic, expr, 2), env);
if (! pic_proc_p(val)) {
pic_errorf(pic, "macro definition \"~s\" evaluates to non-procedure object", var);
}
define_macro(pic, uid, pic_proc_ptr(val));
return pic_undef_value();
}
static pic_value
expand_node(pic_state *pic, pic_value expr, struct pic_env *env, pic_value deferred)
{
switch (pic_type(expr)) {
case PIC_TT_ID:
case PIC_TT_SYMBOL: {
return expand_var(pic, expr, env, deferred);
}
case PIC_TT_PAIR: {
struct pic_proc *mac;
if (! pic_list_p(expr)) {
pic_errorf(pic, "cannot expand improper list: ~s", expr);
}
if (pic_var_p(pic_car(pic, expr))) {
pic_sym *functor;
functor = pic_resolve(pic, pic_car(pic, expr), env);
if (functor == pic->uDEFINE_MACRO) {
return expand_defmacro(pic, expr, env);
}
else if (functor == pic->uLAMBDA) {
return expand_defer(pic, expr, deferred);
}
else if (functor == pic->uDEFINE) {
return expand_define(pic, expr, env, deferred);
}
else if (functor == pic->uQUOTE) {
return expand_quote(pic, expr);
}
if ((mac = find_macro(pic, functor)) != NULL) {
return expand(pic, pic_apply2(pic, mac, expr, pic_obj_value(env)), env, deferred);
}
}
return expand_list(pic, expr, env, deferred);
}
default:
return expr;
}
}
static pic_value
expand(pic_state *pic, pic_value expr, struct pic_env *env, pic_value deferred)
{
size_t ai = pic_gc_arena_preserve(pic);
pic_value v;
v = expand_node(pic, expr, env, deferred);
pic_gc_arena_restore(pic, ai);
pic_gc_protect(pic, v);
return v;
}
pic_value
pic_expand(pic_state *pic, pic_value expr, struct pic_env *env)
{
pic_value v, deferred;
#if DEBUG
puts("before expand:");
pic_debug(pic, expr);
puts("");
#endif
deferred = pic_list1(pic, pic_nil_value());
v = expand(pic, expr, env, deferred);
expand_deferred(pic, deferred, env);
#if DEBUG
puts("after expand:");
pic_debug(pic, v);
puts("");
#endif
return v;
}
KHASH_DECLARE(a, pic_sym *, int)
KHASH_DEFINE2(a, pic_sym *, int, 0, kh_ptr_hash_func, kh_ptr_hash_equal)
typedef struct analyze_scope {
int depth;
pic_sym *rest; /* Nullable */
khash_t(a) args, locals, captures; /* rest args variable is counted as a local */
pic_value defer;
struct analyze_scope *up;
} analyze_scope;
static void
analyzer_scope_init(pic_state *pic, analyze_scope *scope, pic_value formal, analyze_scope *up)
{
int ret;
kh_init(a, &scope->args);
kh_init(a, &scope->locals);
kh_init(a, &scope->captures);
/* analyze formal */
for (; pic_pair_p(formal); formal = pic_cdr(pic, formal)) {
kh_put(a, &scope->args, pic_sym_ptr(pic_car(pic, formal)), &ret);
}
if (pic_nil_p(formal)) {
scope->rest = NULL;
}
else {
scope->rest = pic_sym_ptr(formal);
kh_put(a, &scope->locals, pic_sym_ptr(formal), &ret);
}
scope->up = up;
scope->depth = up ? up->depth + 1 : 0;
scope->defer = pic_list1(pic, pic_nil_value());
}
static void
analyzer_scope_destroy(pic_state *pic, analyze_scope *scope)
{
kh_destroy(a, &scope->args);
kh_destroy(a, &scope->locals);
kh_destroy(a, &scope->captures);
}
static bool
search_scope(analyze_scope *scope, pic_sym *sym)
{
return kh_get(a, &scope->args, sym) != kh_end(&scope->args) || kh_get(a, &scope->locals, sym) != kh_end(&scope->locals) || scope->depth == 0;
}
static int
find_var(pic_state *pic, analyze_scope *scope, pic_sym *sym)
{
int depth = 0, ret;
while (scope) {
if (search_scope(scope, sym)) {
if (depth > 0) {
kh_put(a, &scope->captures, sym, &ret); /* capture! */
}
return depth;
}
depth++;
scope = scope->up;
}
PIC_UNREACHABLE();
}
static void
define_var(pic_state *pic, analyze_scope *scope, pic_sym *sym)
{
int ret;
if (search_scope(scope, sym)) {
if (scope->depth > 0 || pic_dict_has(pic, pic->globals, sym)) {
pic_warnf(pic, "redefining variable: ~s", pic_obj_value(sym));
}
return;
}
kh_put(a, &scope->locals, sym, &ret);
}
static pic_value analyze(pic_state *, analyze_scope *, pic_value);
static pic_value analyze_lambda(pic_state *, analyze_scope *, pic_value);
static pic_value
analyze_var(pic_state *pic, analyze_scope *scope, pic_sym *sym)
{
int depth;
depth = find_var(pic, scope, sym);
if (depth == scope->depth) {
return pic_list2(pic, pic_obj_value(pic->sGREF), pic_obj_value(sym));
} else if (depth == 0) {
return pic_list2(pic, pic_obj_value(pic->sLREF), pic_obj_value(sym));
} else {
return pic_list3(pic, pic_obj_value(pic->sCREF), pic_int_value(depth), pic_obj_value(sym));
}
}
static pic_value
analyze_defer(pic_state *pic, analyze_scope *scope, pic_value form)
{
pic_value skel = pic_cons(pic, pic_invalid_value(), pic_invalid_value());
pic_set_car(pic, scope->defer, pic_acons(pic, form, skel, pic_car(pic, scope->defer)));
return skel;
}
static void
analyze_deferred(pic_state *pic, analyze_scope *scope)
{
pic_value defer, val, src, dst, it;
scope->defer = pic_car(pic, scope->defer);
pic_for_each (defer, pic_reverse(pic, scope->defer), it) {
src = pic_car(pic, defer);
dst = pic_cdr(pic, defer);
val = analyze_lambda(pic, scope, src);
/* copy */
pic_set_car(pic, dst, pic_car(pic, val));
pic_set_cdr(pic, dst, pic_cdr(pic, val));
}
}
static pic_value
analyze_lambda(pic_state *pic, analyze_scope *up, pic_value form)
{
analyze_scope s, *scope = &s;
pic_value formals, body;
pic_value rest = pic_undef_value();
pic_vec *args, *locals, *captures;
size_t i, j;
formals = pic_list_ref(pic, form, 1);
body = pic_list_ref(pic, form, 2);
analyzer_scope_init(pic, scope, formals, up);
/* analyze body */
body = analyze(pic, scope, body);
analyze_deferred(pic, scope);
args = pic_make_vec(pic, kh_size(&scope->args));
for (i = 0; pic_pair_p(formals); formals = pic_cdr(pic, formals), i++) {
args->data[i] = pic_car(pic, formals);
}
if (scope->rest != NULL) {
rest = pic_obj_value(scope->rest);
}
locals = pic_make_vec(pic, kh_size(&scope->locals));
for (i = kh_begin(&scope->locals), j = 0; i < kh_end(&scope->locals); ++i) {
if (kh_exist(&scope->locals, i)) {
locals->data[j++] = pic_obj_value(kh_key(&scope->locals, i));
}
}
captures = pic_make_vec(pic, kh_size(&scope->captures));
for (i = kh_begin(&scope->captures), j = 0; i < kh_end(&scope->captures); ++i) {
if (kh_exist(&scope->captures, i)) {
captures->data[j++] = pic_obj_value(kh_key(&scope->captures, i));
}
}
analyzer_scope_destroy(pic, scope);
return pic_list6(pic, pic_obj_value(pic->uLAMBDA), rest, pic_obj_value(args), pic_obj_value(locals), pic_obj_value(captures), body);
}
static pic_value
analyze_list(pic_state *pic, analyze_scope *scope, pic_value obj)
{
pic_value seq = pic_nil_value(), val, it;
pic_for_each (val, obj, it) {
pic_push(pic, analyze(pic, scope, val), seq);
}
return pic_reverse(pic, seq);
}
static pic_value
analyze_define(pic_state *pic, analyze_scope *scope, pic_value obj)
{
define_var(pic, scope, pic_sym_ptr(pic_list_ref(pic, obj, 1)));
return pic_cons(pic, pic_car(pic, obj), analyze_list(pic, scope, pic_cdr(pic, obj)));
}
static pic_value
analyze_call(pic_state *pic, analyze_scope *scope, pic_value obj)
{
return pic_cons(pic, pic_obj_value(pic->sCALL), analyze_list(pic, scope, obj));
}
static pic_value
analyze_node(pic_state *pic, analyze_scope *scope, pic_value obj)
{
switch (pic_type(obj)) {
case PIC_TT_SYMBOL: {
return analyze_var(pic, scope, pic_sym_ptr(obj));
}
case PIC_TT_PAIR: {
pic_value proc;
if (! pic_list_p(obj)) {
pic_errorf(pic, "invalid expression given: ~s", obj);
}
proc = pic_list_ref(pic, obj, 0);
if (pic_sym_p(proc)) {
pic_sym *sym = pic_sym_ptr(proc);
if (sym == pic->uDEFINE) {
return analyze_define(pic, scope, obj);
}
else if (sym == pic->uLAMBDA) {
return analyze_defer(pic, scope, obj);
}
else if (sym == pic->uQUOTE) {
return obj;
}
else if (sym == pic->uBEGIN || sym == pic->uSETBANG || sym == pic->uIF) {
return pic_cons(pic, pic_car(pic, obj), analyze_list(pic, scope, pic_cdr(pic, obj)));
}
}
return analyze_call(pic, scope, obj);
}
default:
return pic_list2(pic, pic_obj_value(pic->uQUOTE), obj);
}
}
static pic_value
analyze(pic_state *pic, analyze_scope *scope, pic_value obj)
{
size_t ai = pic_gc_arena_preserve(pic);
pic_value res;
res = analyze_node(pic, scope, obj);
pic_gc_arena_restore(pic, ai);
pic_gc_protect(pic, res);
return res;
}
pic_value
pic_analyze(pic_state *pic, pic_value obj)
{
analyze_scope s, *scope = &s;
analyzer_scope_init(pic, scope, pic_nil_value(), NULL);
obj = analyze(pic, scope, obj);
analyze_deferred(pic, scope);
analyzer_scope_destroy(pic, scope);
return obj;
}
typedef struct codegen_context {
/* rest args variable is counted as a local */
pic_sym *rest;
pic_vec *args, *locals, *captures;
/* actual bit code sequence */
pic_code *code;
size_t clen, ccapa;
/* child ireps */
struct pic_irep **irep;
size_t ilen, icapa;
/* constant object pool */
pic_value *pool;
size_t plen, pcapa;
struct codegen_context *up;
} codegen_context;
static void create_activation(pic_state *, codegen_context *);
static void
codegen_context_init(pic_state *pic, codegen_context *cxt, codegen_context *up, pic_sym *rest, pic_vec *args, pic_vec *locals, pic_vec *captures)
{
cxt->up = up;
cxt->rest = rest;
cxt->args = args;
cxt->locals = locals;
cxt->captures = captures;
cxt->code = pic_calloc(pic, PIC_ISEQ_SIZE, sizeof(pic_code));
cxt->clen = 0;
cxt->ccapa = PIC_ISEQ_SIZE;
cxt->irep = pic_calloc(pic, PIC_IREP_SIZE, sizeof(struct pic_irep *));
cxt->ilen = 0;
cxt->icapa = PIC_IREP_SIZE;
cxt->pool = pic_calloc(pic, PIC_POOL_SIZE, sizeof(pic_value));
cxt->plen = 0;
cxt->pcapa = PIC_POOL_SIZE;
create_activation(pic, cxt);
}
static struct pic_irep *
codegen_context_destroy(pic_state *pic, codegen_context *cxt)
{
struct pic_irep *irep;
/* create irep */
irep = (struct pic_irep *)pic_obj_alloc(pic, sizeof(struct pic_irep), PIC_TT_IREP);
irep->varg = cxt->rest != NULL;
irep->argc = (int)cxt->args->len + 1;
irep->localc = (int)cxt->locals->len;
irep->capturec = (int)cxt->captures->len;
irep->code = pic_realloc(pic, cxt->code, sizeof(pic_code) * cxt->clen);
irep->clen = cxt->clen;
irep->irep = pic_realloc(pic, cxt->irep, sizeof(struct pic_irep *) * cxt->ilen);
irep->ilen = cxt->ilen;
irep->pool = pic_realloc(pic, cxt->pool, sizeof(pic_value) * cxt->plen);
irep->plen = cxt->plen;
return irep;
}
#define check_size(pic, cxt, x, name, type) do { \
if (cxt->x##len >= cxt->x##capa) { \
cxt->x##capa *= 2; \
cxt->name = pic_realloc(pic, cxt->name, sizeof(type) * cxt->x##capa); \
} \
} while (0)
#define check_code_size(pic, cxt) check_size(pic, cxt, c, code, pic_code)
#define check_irep_size(pic, cxt) check_size(pic, cxt, i, irep, struct pic_irep *)
#define check_pool_size(pic, cxt) check_size(pic, cxt, p, pool, pic_value)
#define emit_n(pic, cxt, ins) do { \
check_code_size(pic, cxt); \
cxt->code[cxt->clen].insn = ins; \
cxt->clen++; \
} while (0) \
#define emit_i(pic, cxt, ins, I) do { \
check_code_size(pic, cxt); \
cxt->code[cxt->clen].insn = ins; \
cxt->code[cxt->clen].u.i = I; \
cxt->clen++; \
} while (0) \
#define emit_c(pic, cxt, ins, C) do { \
check_code_size(pic, cxt); \
cxt->code[cxt->clen].insn = ins; \
cxt->code[cxt->clen].u.c = C; \
cxt->clen++; \
} while (0) \
#define emit_r(pic, cxt, ins, D, I) do { \
check_code_size(pic, cxt); \
cxt->code[cxt->clen].insn = ins; \
cxt->code[cxt->clen].u.r.depth = D; \
cxt->code[cxt->clen].u.r.idx = I; \
cxt->clen++; \
} while (0) \
#define emit_ret(pic, cxt, tailpos) if (tailpos) emit_n(pic, cxt, OP_RET)
static int
index_capture(codegen_context *cxt, pic_sym *sym, int depth)
{
size_t i;
while (depth-- > 0) {
cxt = cxt->up;
}
for (i = 0; i < cxt->captures->len; ++i) {
if (pic_sym_ptr(cxt->captures->data[i]) == sym)
return (int)i;
}
return -1;
}
static int
index_local(codegen_context *cxt, pic_sym *sym)
{
size_t i, offset;
offset = 1;
for (i = 0; i < cxt->args->len; ++i) {
if (pic_sym_ptr(cxt->args->data[i]) == sym)
return (int)(i + offset);
}
offset += i;
for (i = 0; i < cxt->locals->len; ++i) {
if (pic_sym_ptr(cxt->locals->data[i]) == sym)
return (int)(i + offset);
}
return -1;
}
static int
index_global(pic_state *pic, codegen_context *cxt, pic_sym *name)
{
extern pic_value pic_vm_gref_slot(pic_state *, pic_sym *);
int pidx;
pic_value slot;
slot = pic_vm_gref_slot(pic, name);
check_pool_size(pic, cxt);
pidx = (int)cxt->plen++;
cxt->pool[pidx] = slot;
return pidx;
}
static void
create_activation(pic_state *pic, codegen_context *cxt)
{
size_t i;
int n;
for (i = 0; i < cxt->captures->len; ++i) {
n = index_local(cxt, pic_sym_ptr(cxt->captures->data[i]));
assert(n != -1);
if (n <= (int)cxt->args->len || cxt->rest == pic_sym_ptr(cxt->captures->data[i])) {
/* copy arguments to capture variable area */
emit_i(pic, cxt, OP_LREF, n);
} else {
/* otherwise, just extend the stack */
emit_n(pic, cxt, OP_PUSHUNDEF);
}
}
}
static void codegen(pic_state *, codegen_context *, pic_value, bool);
static void
codegen_ref(pic_state *pic, codegen_context *cxt, pic_value obj, bool tailpos)
{
pic_sym *sym;
sym = pic_sym_ptr(pic_car(pic, obj));
if (sym == pic->sGREF) {
pic_sym *name;
name = pic_sym_ptr(pic_list_ref(pic, obj, 1));
emit_i(pic, cxt, OP_GREF, index_global(pic, cxt, name));
emit_ret(pic, cxt, tailpos);
}
else if (sym == pic->sCREF) {
pic_sym *name;
int depth;
depth = pic_int(pic_list_ref(pic, obj, 1));
name = pic_sym_ptr(pic_list_ref(pic, obj, 2));
emit_r(pic, cxt, OP_CREF, depth, index_capture(cxt, name, depth));
emit_ret(pic, cxt, tailpos);
}
else if (sym == pic->sLREF) {
pic_sym *name;
int i;
name = pic_sym_ptr(pic_list_ref(pic, obj, 1));
if ((i = index_capture(cxt, name, 0)) != -1) {
emit_i(pic, cxt, OP_LREF, i + (int)cxt->args->len + (int)cxt->locals->len + 1);
emit_ret(pic, cxt, tailpos);
} else {
emit_i(pic, cxt, OP_LREF, index_local(cxt, name));
emit_ret(pic, cxt, tailpos);
}
}
}
static void
codegen_set(pic_state *pic, codegen_context *cxt, pic_value obj, bool tailpos)
{
pic_value var, val;
pic_sym *type;
val = pic_list_ref(pic, obj, 2);
codegen(pic, cxt, val, false);
var = pic_list_ref(pic, obj, 1);
type = pic_sym_ptr(pic_list_ref(pic, var, 0));
if (type == pic->sGREF) {
pic_sym *name;
name = pic_sym_ptr(pic_list_ref(pic, var, 1));
emit_i(pic, cxt, OP_GSET, index_global(pic, cxt, name));
emit_ret(pic, cxt, tailpos);
}
else if (type == pic->sCREF) {
pic_sym *name;
int depth;
depth = pic_int(pic_list_ref(pic, var, 1));
name = pic_sym_ptr(pic_list_ref(pic, var, 2));
emit_r(pic, cxt, OP_CSET, depth, index_capture(cxt, name, depth));
emit_ret(pic, cxt, tailpos);
}
else if (type == pic->sLREF) {
pic_sym *name;
int i;
name = pic_sym_ptr(pic_list_ref(pic, var, 1));
if ((i = index_capture(cxt, name, 0)) != -1) {
emit_i(pic, cxt, OP_LSET, i + (int)cxt->args->len + (int)cxt->locals->len + 1);
emit_ret(pic, cxt, tailpos);
} else {
emit_i(pic, cxt, OP_LSET, index_local(cxt, name));
emit_ret(pic, cxt, tailpos);
}
}
}
static void
codegen_lambda(pic_state *pic, codegen_context *cxt, pic_value obj, bool tailpos)
{
codegen_context c, *inner_cxt = &c;
pic_value rest_opt, body;
pic_sym *rest = NULL;
pic_vec *args, *locals, *captures;
check_irep_size(pic, cxt);
/* extract arguments */
rest_opt = pic_list_ref(pic, obj, 1);
if (pic_sym_p(rest_opt)) {
rest = pic_sym_ptr(rest_opt);
}
args = pic_vec_ptr(pic_list_ref(pic, obj, 2));
locals = pic_vec_ptr(pic_list_ref(pic, obj, 3));
captures = pic_vec_ptr(pic_list_ref(pic, obj, 4));
body = pic_list_ref(pic, obj, 5);
/* emit irep */
codegen_context_init(pic, inner_cxt, cxt, rest, args, locals, captures);
codegen(pic, inner_cxt, body, true);
cxt->irep[cxt->ilen] = codegen_context_destroy(pic, inner_cxt);
/* emit OP_LAMBDA */
emit_i(pic, cxt, OP_LAMBDA, cxt->ilen++);
emit_ret(pic, cxt, tailpos);
}
static void
codegen_if(pic_state *pic, codegen_context *cxt, pic_value obj, bool tailpos)
{
int s, t;
codegen(pic, cxt, pic_list_ref(pic, obj, 1), false);
s = (int)cxt->clen;
emit_n(pic, cxt, OP_JMPIF);
/* if false branch */
codegen(pic, cxt, pic_list_ref(pic, obj, 3), tailpos);
t = (int)cxt->clen;
emit_n(pic, cxt, OP_JMP);
cxt->code[s].u.i = (int)cxt->clen - s;
/* if true branch */
codegen(pic, cxt, pic_list_ref(pic, obj, 2), tailpos);
cxt->code[t].u.i = (int)cxt->clen - t;
}
static void
codegen_begin(pic_state *pic, codegen_context *cxt, pic_value obj, bool tailpos)
{
codegen(pic, cxt, pic_list_ref(pic, obj, 1), false);
emit_n(pic, cxt, OP_POP);
codegen(pic, cxt, pic_list_ref(pic, obj, 2), tailpos);
}
static void
codegen_quote(pic_state *pic, codegen_context *cxt, pic_value obj, bool tailpos)
{
int pidx;
obj = pic_list_ref(pic, obj, 1);
switch (pic_type(obj)) {
case PIC_TT_BOOL:
emit_n(pic, cxt, (pic_true_p(obj) ? OP_PUSHTRUE : OP_PUSHFALSE));
emit_ret(pic, cxt, tailpos);
break;
case PIC_TT_INT:
emit_i(pic, cxt, OP_PUSHINT, pic_int(obj));
emit_ret(pic, cxt, tailpos);
break;
case PIC_TT_NIL:
emit_n(pic, cxt, OP_PUSHNIL);
emit_ret(pic, cxt, tailpos);
break;
case PIC_TT_CHAR:
emit_c(pic, cxt, OP_PUSHCHAR, pic_char(obj));
emit_ret(pic, cxt, tailpos);
break;
default:
check_pool_size(pic, cxt);
pidx = (int)cxt->plen++;
cxt->pool[pidx] = obj;
emit_i(pic, cxt, OP_PUSHCONST, pidx);
emit_ret(pic, cxt, tailpos);
break;
}
}
static bool
codegen_call_vm(pic_state *pic, codegen_context *cxt, pic_value proc, size_t len, bool tailpos)
{
if (pic_sym_ptr(pic_list_ref(pic, proc, 0)) == pic->sGREF) {
pic_sym *sym;
sym = pic_sym_ptr(pic_list_ref(pic, proc, 1));
#define VM(uid, op) \
if (sym == uid) { \
emit_i(pic, cxt, op, len); \
emit_ret(pic, cxt, tailpos); \
return true; \
}
VM(pic->uCONS, OP_CONS)
VM(pic->uCAR, OP_CAR)
VM(pic->uCDR, OP_CDR)
VM(pic->uNILP, OP_NILP)
VM(pic->uSYMBOLP, OP_SYMBOLP)
VM(pic->uPAIRP, OP_PAIRP)
VM(pic->uNOT, OP_NOT)
VM(pic->uEQ, OP_EQ)
VM(pic->uLT, OP_LT)
VM(pic->uLE, OP_LE)
VM(pic->uGT, OP_GT)
VM(pic->uGE, OP_GE)
VM(pic->uADD, OP_ADD)
VM(pic->uSUB, OP_SUB)
VM(pic->uMUL, OP_MUL)
VM(pic->uDIV, OP_DIV)
}
return false;
}
static void
codegen_call(pic_state *pic, codegen_context *cxt, pic_value obj, bool tailpos)
{
int len = (int)pic_length(pic, obj);
pic_value elt, it;
pic_for_each (elt, pic_cdr(pic, obj), it) {
codegen(pic, cxt, elt, false);
}
if (codegen_call_vm(pic, cxt, pic_list_ref(pic, obj, 1), len - 1, tailpos)) {
return;
}
emit_i(pic, cxt, (tailpos ? OP_TAILCALL : OP_CALL), len - 1);
}
static void
codegen(pic_state *pic, codegen_context *cxt, pic_value obj, bool tailpos)
{
pic_sym *sym;
sym = pic_sym_ptr(pic_car(pic, obj));
if (sym == pic->sGREF || sym == pic->sCREF || sym == pic->sLREF) {
codegen_ref(pic, cxt, obj, tailpos);
}
else if (sym == pic->uSETBANG || sym == pic->uDEFINE) {
codegen_set(pic, cxt, obj, tailpos);
}
else if (sym == pic->uLAMBDA) {
codegen_lambda(pic, cxt, obj, tailpos);
}
else if (sym == pic->uIF) {
codegen_if(pic, cxt, obj, tailpos);
}
else if (sym == pic->uBEGIN) {
codegen_begin(pic, cxt, obj, tailpos);
}
else if (sym == pic->uQUOTE) {
codegen_quote(pic, cxt, obj, tailpos);
}
else if (sym == pic->sCALL) {
codegen_call(pic, cxt, obj, tailpos);
}
else {
pic_errorf(pic, "codegen: unknown AST type ~s", obj);
}
}
struct pic_irep *
pic_codegen(pic_state *pic, pic_value obj)
{
pic_vec *empty = pic_make_vec(pic, 0);
codegen_context c, *cxt = &c;
codegen_context_init(pic, cxt, NULL, NULL, empty, empty, empty);
codegen(pic, cxt, obj, true);
return codegen_context_destroy(pic, cxt);
}
#define SAVE(pic, ai, obj) pic_gc_arena_restore(pic, ai); pic_gc_protect(pic, obj)
struct pic_proc *
pic_compile(pic_state *pic, pic_value obj, struct pic_env *env)
{
struct pic_irep *irep;
size_t ai = pic_gc_arena_preserve(pic);
#if DEBUG
fprintf(stdout, "ai = %zu\n", pic_gc_arena_preserve(pic));
fprintf(stdout, "# input expression\n");
pic_write(pic, obj);
fprintf(stdout, "\n");
fprintf(stdout, "ai = %zu\n", pic_gc_arena_preserve(pic));
#endif
/* expand */
obj = pic_expand(pic, obj, env);
#if DEBUG
fprintf(stdout, "## expand completed\n");
pic_write(pic, obj);
fprintf(stdout, "\n");
fprintf(stdout, "ai = %zu\n", pic_gc_arena_preserve(pic));
#endif
SAVE(pic, ai, obj);
/* analyze */
obj = pic_analyze(pic, obj);
#if DEBUG
fprintf(stdout, "## analyzer completed\n");
pic_write(pic, obj);
fprintf(stdout, "\n");
fprintf(stdout, "ai = %zu\n", pic_gc_arena_preserve(pic));
#endif
SAVE(pic, ai, obj);
/* codegen */
irep = pic_codegen(pic, obj);
#if DEBUG
fprintf(stdout, "## codegen completed\n");
pic_dump_irep(irep);
#endif
#if DEBUG
fprintf(stdout, "# compilation finished\n");
puts("");
#endif
SAVE(pic, ai, pic_obj_value(irep));
return pic_make_proc_irep(pic, irep, NULL);
}