picrin/extlib/benz/codegen.c

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/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
#include "picrin/pair.h"
#include "picrin/irep.h"
#include "picrin/proc.h"
#include "picrin/lib.h"
#include "picrin/macro.h"
#include "picrin/dict.h"
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#include "picrin/symbol.h"
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#if PIC_NONE_IS_FALSE
# define OP_PUSHNONE OP_PUSHFALSE
#else
# error enable PIC_NONE_IS_FALSE
#endif
/**
* scope object
*/
typedef struct analyze_scope {
int depth;
bool varg;
xvect args, locals, captures; /* rest args variable is counted as a local */
pic_value defer;
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struct analyze_scope *up;
} analyze_scope;
/**
* global analyzer state
*/
typedef struct analyze_state {
pic_state *pic;
analyze_scope *scope;
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pic_sym *rCONS, *rCAR, *rCDR, *rNILP;
pic_sym *rSYMBOLP, *rPAIRP;
pic_sym *rADD, *rSUB, *rMUL, *rDIV;
pic_sym *rEQ, *rLT, *rLE, *rGT, *rGE, *rNOT;
pic_sym *rVALUES, *rCALL_WITH_VALUES;
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} analyze_state;
static bool push_scope(analyze_state *, pic_value);
static void pop_scope(analyze_state *);
#define register_symbol(pic, state, slot, name) do { \
state->slot = pic_intern_cstr(pic, name); \
} while (0)
#define register_renamed_symbol(pic, state, slot, lib, id) do { \
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pic_sym *sym, *gsym; \
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sym = pic_intern_cstr(pic, id); \
if (! pic_find_rename(pic, lib->env, sym, &gsym)) { \
pic_errorf(pic, "internal error! native VM procedure not found: %s", id); \
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} \
state->slot = gsym; \
} while (0)
static analyze_state *
new_analyze_state(pic_state *pic)
{
analyze_state *state;
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pic_sym *sym;
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state = pic_alloc(pic, sizeof(analyze_state));
state->pic = pic;
state->scope = NULL;
/* native VM procedures */
register_renamed_symbol(pic, state, rCONS, pic->PICRIN_BASE, "cons");
register_renamed_symbol(pic, state, rCAR, pic->PICRIN_BASE, "car");
register_renamed_symbol(pic, state, rCDR, pic->PICRIN_BASE, "cdr");
register_renamed_symbol(pic, state, rNILP, pic->PICRIN_BASE, "null?");
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register_renamed_symbol(pic, state, rSYMBOLP, pic->PICRIN_BASE, "symbol?");
register_renamed_symbol(pic, state, rPAIRP, pic->PICRIN_BASE, "pair?");
register_renamed_symbol(pic, state, rADD, pic->PICRIN_BASE, "+");
register_renamed_symbol(pic, state, rSUB, pic->PICRIN_BASE, "-");
register_renamed_symbol(pic, state, rMUL, pic->PICRIN_BASE, "*");
register_renamed_symbol(pic, state, rDIV, pic->PICRIN_BASE, "/");
register_renamed_symbol(pic, state, rEQ, pic->PICRIN_BASE, "=");
register_renamed_symbol(pic, state, rLT, pic->PICRIN_BASE, "<");
register_renamed_symbol(pic, state, rLE, pic->PICRIN_BASE, "<=");
register_renamed_symbol(pic, state, rGT, pic->PICRIN_BASE, ">");
register_renamed_symbol(pic, state, rGE, pic->PICRIN_BASE, ">=");
register_renamed_symbol(pic, state, rNOT, pic->PICRIN_BASE, "not");
register_renamed_symbol(pic, state, rVALUES, pic->PICRIN_BASE, "values");
register_renamed_symbol(pic, state, rCALL_WITH_VALUES, pic->PICRIN_BASE, "call-with-values");
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/* push initial scope */
push_scope(state, pic_nil_value());
pic_dict_for_each (sym, pic->globals) {
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xv_push(&state->scope->locals, &sym);
}
return state;
}
static void
destroy_analyze_state(analyze_state *state)
{
pop_scope(state);
pic_free(state->pic, state);
}
static bool
analyze_args(pic_state *pic, pic_value formals, bool *varg, xvect *args, xvect *locals)
{
pic_value v, t;
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pic_sym *sym;
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for (v = formals; pic_pair_p(v); v = pic_cdr(pic, v)) {
t = pic_car(pic, v);
if (! pic_sym_p(t)) {
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return false;
}
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sym = pic_sym_ptr(t);
xv_push(args, &sym);
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}
if (pic_nil_p(v)) {
*varg = false;
}
else if (pic_sym_p(v)) {
*varg = true;
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sym = pic_sym_ptr(v);
xv_push(locals, &sym);
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}
else {
return false;
}
return true;
}
static bool
push_scope(analyze_state *state, pic_value formals)
{
pic_state *pic = state->pic;
analyze_scope *scope;
bool varg;
xvect args, locals, captures;
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xv_init(&args, sizeof(pic_sym *));
xv_init(&locals, sizeof(pic_sym *));
xv_init(&captures, sizeof(pic_sym *));
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if (analyze_args(pic, formals, &varg, &args, &locals)) {
scope = pic_alloc(pic, sizeof(analyze_scope));
scope->up = state->scope;
scope->depth = scope->up ? scope->up->depth + 1 : 0;
scope->varg = varg;
scope->args = args;
scope->locals = locals;
scope->captures = captures;
scope->defer = pic_nil_value();
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state->scope = scope;
return true;
}
else {
xv_destroy(&args);
xv_destroy(&locals);
return false;
}
}
static void
pop_scope(analyze_state *state)
{
analyze_scope *scope;
scope = state->scope;
xv_destroy(&scope->args);
xv_destroy(&scope->locals);
xv_destroy(&scope->captures);
scope = scope->up;
pic_free(state->pic, state->scope);
state->scope = scope;
}
static bool
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lookup_scope(analyze_scope *scope, pic_sym *sym)
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{
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pic_sym **arg, **local;
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size_t i;
/* args */
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for (i = 0; i < xv_size(&scope->args); ++i) {
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arg = xv_get(&scope->args, i);
if (*arg == sym)
return true;
}
/* locals */
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for (i = 0; i < xv_size(&scope->locals); ++i) {
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local = xv_get(&scope->locals, i);
if (*local == sym)
return true;
}
return false;
}
static void
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capture_var(analyze_scope *scope, pic_sym *sym)
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{
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pic_sym **var;
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size_t i;
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for (i = 0; i < xv_size(&scope->captures); ++i) {
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var = xv_get(&scope->captures, i);
if (*var == sym) {
break;
}
}
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if (i == xv_size(&scope->captures)) {
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xv_push(&scope->captures, &sym);
}
}
static int
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find_var(analyze_state *state, pic_sym *sym)
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{
analyze_scope *scope = state->scope;
int depth = 0;
while (scope) {
if (lookup_scope(scope, sym)) {
if (depth > 0) {
capture_var(scope, sym);
}
return depth;
}
depth++;
scope = scope->up;
}
return -1;
}
static void
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define_var(analyze_state *state, pic_sym *sym)
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{
pic_state *pic = state->pic;
analyze_scope *scope = state->scope;
if (lookup_scope(scope, sym)) {
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pic_warnf(pic, "redefining variable: ~s", pic_obj_value(sym));
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return;
}
xv_push(&scope->locals, &sym);
}
static pic_value analyze_node(analyze_state *, pic_value, bool);
static pic_value analyze_procedure(analyze_state *, pic_value, pic_value, pic_value);
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static pic_value
analyze(analyze_state *state, pic_value obj, bool tailpos)
{
pic_state *pic = state->pic;
size_t ai = pic_gc_arena_preserve(pic);
pic_value res;
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pic_sym *tag;
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res = analyze_node(state, obj, tailpos);
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tag = pic_sym_ptr(pic_car(pic, res));
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if (tailpos) {
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if (tag == pic->sIF || tag == pic->sBEGIN || tag == pic->sTAILCALL || tag == pic->sTAILCALL_WITH_VALUES || tag == pic->sRETURN) {
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/* pass through */
}
else {
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res = pic_list2(pic, pic_obj_value(pic->sRETURN), res);
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}
}
pic_gc_arena_restore(pic, ai);
pic_gc_protect(pic, res);
pic_gc_protect(pic, state->scope->defer);
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return res;
}
static pic_value
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analyze_global_var(analyze_state *state, pic_sym *sym)
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{
pic_state *pic = state->pic;
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return pic_list2(pic, pic_obj_value(pic->sGREF), pic_obj_value(sym));
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}
static pic_value
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analyze_local_var(analyze_state *state, pic_sym *sym)
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{
pic_state *pic = state->pic;
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return pic_list2(pic, pic_obj_value(pic->sLREF), pic_obj_value(sym));
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}
static pic_value
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analyze_free_var(analyze_state *state, pic_sym *sym, int depth)
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{
pic_state *pic = state->pic;
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return pic_list3(pic, pic_obj_value(pic->sCREF), pic_int_value(depth), pic_obj_value(sym));
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}
static pic_value
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analyze_var(analyze_state *state, pic_sym *sym)
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{
pic_state *pic = state->pic;
int depth;
if ((depth = find_var(state, sym)) == -1) {
pic_errorf(pic, "unbound variable %s", pic_symbol_name(pic, sym));
}
if (depth == state->scope->depth) {
return analyze_global_var(state, sym);
} else if (depth == 0) {
return analyze_local_var(state, sym);
} else {
return analyze_free_var(state, sym, depth);
}
}
static pic_value
analyze_defer(analyze_state *state, pic_value name, pic_value formal, pic_value body)
{
pic_state *pic = state->pic;
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pic_sym *sNOWHERE = pic_intern_cstr(pic, "<<nowhere>>");
pic_value skel;
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skel = pic_list2(pic, pic_obj_value(pic->sGREF), pic_obj_value(sNOWHERE));
pic_push(pic, pic_list4(pic, name, formal, body, skel), state->scope->defer);
return skel;
}
static void
analyze_deferred(analyze_state *state)
{
pic_state *pic = state->pic;
pic_value defer, val, name, formal, body, dst;
pic_for_each (defer, pic_reverse(pic, state->scope->defer)) {
name = pic_list_ref(pic, defer, 0);
formal = pic_list_ref(pic, defer, 1);
body = pic_list_ref(pic, defer, 2);
dst = pic_list_ref(pic, defer, 3);
val = analyze_procedure(state, name, formal, body);
/* copy */
pic_pair_ptr(dst)->car = pic_car(pic, val);
pic_pair_ptr(dst)->cdr = pic_cdr(pic, val);
}
state->scope->defer = pic_nil_value();
}
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static pic_value
analyze_procedure(analyze_state *state, pic_value name, pic_value formals, pic_value body_exprs)
{
pic_state *pic = state->pic;
pic_value args, locals, varg, captures, body;
assert(pic_sym_p(name) || pic_false_p(name));
if (push_scope(state, formals)) {
analyze_scope *scope = state->scope;
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pic_sym **var;
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size_t i;
args = pic_nil_value();
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for (i = xv_size(&scope->args); i > 0; --i) {
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var = xv_get(&scope->args, i - 1);
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pic_push(pic, pic_obj_value(*var), args);
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}
varg = scope->varg
? pic_true_value()
: pic_false_value();
/* To know what kind of local variables are defined, analyze body at first. */
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body = analyze(state, pic_cons(pic, pic_obj_value(pic->rBEGIN), body_exprs), true);
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analyze_deferred(state);
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locals = pic_nil_value();
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for (i = xv_size(&scope->locals); i > 0; --i) {
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var = xv_get(&scope->locals, i - 1);
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pic_push(pic, pic_obj_value(*var), locals);
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}
captures = pic_nil_value();
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for (i = xv_size(&scope->captures); i > 0; --i) {
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var = xv_get(&scope->captures, i - 1);
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pic_push(pic, pic_obj_value(*var), captures);
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}
pop_scope(state);
}
else {
pic_errorf(pic, "invalid formal syntax: ~s", args);
}
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return pic_list7(pic, pic_obj_value(pic->sLAMBDA), name, args, locals, varg, captures, body);
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}
static pic_value
analyze_lambda(analyze_state *state, pic_value obj)
{
pic_state *pic = state->pic;
pic_value formals, body_exprs;
if (pic_length(pic, obj) < 2) {
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pic_errorf(pic, "syntax error");
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}
formals = pic_list_ref(pic, obj, 1);
body_exprs = pic_list_tail(pic, obj, 2);
return analyze_defer(state, pic_false_value(), formals, body_exprs);
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}
static pic_value
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analyze_declare(analyze_state *state, pic_sym *var)
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{
define_var(state, var);
return analyze_var(state, var);
}
static pic_value
analyze_define(analyze_state *state, pic_value obj)
{
pic_state *pic = state->pic;
pic_value var, val;
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pic_sym *sym;
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if (pic_length(pic, obj) != 3) {
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pic_errorf(pic, "syntax error");
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}
var = pic_list_ref(pic, obj, 1);
if (! pic_sym_p(var)) {
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pic_errorf(pic, "syntax error");
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} else {
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sym = pic_sym_ptr(var);
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}
var = analyze_declare(state, sym);
if (pic_pair_p(pic_list_ref(pic, obj, 2))
&& pic_sym_p(pic_list_ref(pic, pic_list_ref(pic, obj, 2), 0))
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&& pic_sym_ptr(pic_list_ref(pic, pic_list_ref(pic, obj, 2), 0)) == pic->rLAMBDA) {
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pic_value formals, body_exprs;
formals = pic_list_ref(pic, pic_list_ref(pic, obj, 2), 1);
body_exprs = pic_list_tail(pic, pic_list_ref(pic, obj, 2), 2);
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val = analyze_defer(state, pic_obj_value(sym), formals, body_exprs);
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} else {
if (pic_length(pic, obj) != 3) {
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pic_errorf(pic, "syntax error");
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}
val = analyze(state, pic_list_ref(pic, obj, 2), false);
}
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return pic_list3(pic, pic_obj_value(pic->sSETBANG), var, val);
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}
static pic_value
analyze_if(analyze_state *state, pic_value obj, bool tailpos)
{
pic_state *pic = state->pic;
pic_value cond, if_true, if_false;
if_false = pic_none_value();
switch (pic_length(pic, obj)) {
default:
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pic_errorf(pic, "syntax error");
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case 4:
if_false = pic_list_ref(pic, obj, 3);
PIC_FALLTHROUGH;
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case 3:
if_true = pic_list_ref(pic, obj, 2);
}
/* analyze in order */
cond = analyze(state, pic_list_ref(pic, obj, 1), false);
if_true = analyze(state, if_true, tailpos);
if_false = analyze(state, if_false, tailpos);
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return pic_list4(pic, pic_obj_value(pic->sIF), cond, if_true, if_false);
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}
static pic_value
analyze_begin(analyze_state *state, pic_value obj, bool tailpos)
{
pic_state *pic = state->pic;
pic_value seq;
bool tail;
switch (pic_length(pic, obj)) {
case 1:
return analyze(state, pic_none_value(), tailpos);
case 2:
return analyze(state, pic_list_ref(pic, obj, 1), tailpos);
default:
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seq = pic_list1(pic, pic_obj_value(pic->sBEGIN));
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for (obj = pic_cdr(pic, obj); ! pic_nil_p(obj); obj = pic_cdr(pic, obj)) {
if (pic_nil_p(pic_cdr(pic, obj))) {
tail = tailpos;
} else {
tail = false;
}
seq = pic_cons(pic, analyze(state, pic_car(pic, obj), tail), seq);
}
return pic_reverse(pic, seq);
}
}
static pic_value
analyze_set(analyze_state *state, pic_value obj)
{
pic_state *pic = state->pic;
pic_value var, val;
if (pic_length(pic, obj) != 3) {
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pic_errorf(pic, "syntax error");
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}
var = pic_list_ref(pic, obj, 1);
if (! pic_sym_p(var)) {
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pic_errorf(pic, "syntax error");
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}
val = pic_list_ref(pic, obj, 2);
var = analyze(state, var, false);
val = analyze(state, val, false);
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return pic_list3(pic, pic_obj_value(pic->sSETBANG), var, val);
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}
static pic_value
analyze_quote(analyze_state *state, pic_value obj)
{
pic_state *pic = state->pic;
if (pic_length(pic, obj) != 2) {
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pic_errorf(pic, "syntax error");
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}
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return pic_list2(pic, pic_obj_value(pic->sQUOTE), pic_list_ref(pic, obj, 1));
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}
#define ARGC_ASSERT_GE(n) do { \
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if (pic_length(pic, obj) < (n) + 1) { \
pic_errorf(pic, "wrong number of arguments"); \
} \
} while (0)
#define FOLD_ARGS(sym) do { \
obj = analyze(state, pic_car(pic, args), false); \
pic_for_each (arg, pic_cdr(pic, args)) { \
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obj = pic_list3(pic, pic_obj_value(sym), obj, \
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analyze(state, arg, false)); \
} \
} while (0)
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static pic_value
analyze_add(analyze_state *state, pic_value obj, bool tailpos)
{
pic_state *pic = state->pic;
pic_value args, arg;
ARGC_ASSERT_GE(0);
switch (pic_length(pic, obj)) {
case 1:
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return pic_list2(pic, pic_obj_value(pic->sQUOTE), pic_int_value(0));
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case 2:
return analyze(state, pic_car(pic, pic_cdr(pic, obj)), tailpos);
default:
args = pic_cdr(pic, obj);
FOLD_ARGS(pic->sADD);
return obj;
}
}
static pic_value
analyze_sub(analyze_state *state, pic_value obj)
{
pic_state *pic = state->pic;
pic_value args, arg;
ARGC_ASSERT_GE(1);
switch (pic_length(pic, obj)) {
case 2:
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return pic_list2(pic, pic_obj_value(pic->sMINUS),
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analyze(state, pic_car(pic, pic_cdr(pic, obj)), false));
default:
args = pic_cdr(pic, obj);
FOLD_ARGS(pic->sSUB);
return obj;
}
}
static pic_value
analyze_mul(analyze_state *state, pic_value obj, bool tailpos)
{
pic_state *pic = state->pic;
pic_value args, arg;
ARGC_ASSERT_GE(0);
switch (pic_length(pic, obj)) {
case 1:
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return pic_list2(pic, pic_obj_value(pic->sQUOTE), pic_int_value(1));
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case 2:
return analyze(state, pic_car(pic, pic_cdr(pic, obj)), tailpos);
default:
args = pic_cdr(pic, obj);
FOLD_ARGS(pic->sMUL);
return obj;
}
}
static pic_value
analyze_div(analyze_state *state, pic_value obj)
{
pic_state *pic = state->pic;
pic_value args, arg;
ARGC_ASSERT_GE(1);
switch (pic_length(pic, obj)) {
case 2:
args = pic_cdr(pic, obj);
obj = pic_list3(pic, pic_car(pic, obj), pic_float_value(1), pic_car(pic, args));
return analyze(state, obj, false);
default:
args = pic_cdr(pic, obj);
FOLD_ARGS(pic->sDIV);
return obj;
}
}
static pic_value
analyze_call(analyze_state *state, pic_value obj, bool tailpos)
{
pic_state *pic = state->pic;
pic_value seq, elt;
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pic_sym *call;
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if (! tailpos) {
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call = pic->sCALL;
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} else {
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call = pic->sTAILCALL;
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}
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seq = pic_list1(pic, pic_obj_value(call));
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pic_for_each (elt, obj) {
seq = pic_cons(pic, analyze(state, elt, false), seq);
}
return pic_reverse(pic, seq);
}
static pic_value
analyze_values(analyze_state *state, pic_value obj, bool tailpos)
{
pic_state *pic = state->pic;
pic_value v, seq;
if (! tailpos) {
return analyze_call(state, obj, false);
}
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seq = pic_list1(pic, pic_obj_value(pic->sRETURN));
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pic_for_each (v, pic_cdr(pic, obj)) {
seq = pic_cons(pic, analyze(state, v, false), seq);
}
return pic_reverse(pic, seq);
}
static pic_value
analyze_call_with_values(analyze_state *state, pic_value obj, bool tailpos)
{
pic_state *pic = state->pic;
pic_value prod, cnsm;
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pic_sym *call;
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if (pic_length(pic, obj) != 3) {
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pic_errorf(pic, "wrong number of arguments");
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}
if (! tailpos) {
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call = pic->sCALL_WITH_VALUES;
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} else {
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call = pic->sTAILCALL_WITH_VALUES;
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}
prod = analyze(state, pic_list_ref(pic, obj, 1), false);
cnsm = analyze(state, pic_list_ref(pic, obj, 2), false);
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return pic_list3(pic, pic_obj_value(call), prod, cnsm);
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}
#define ARGC_ASSERT(n) do { \
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if (pic_length(pic, obj) != (n) + 1) { \
pic_errorf(pic, "wrong number of arguments"); \
} \
} while (0)
#define ARGC_ASSERT_WITH_FALLBACK(n) do { \
if (pic_length(pic, obj) != (n) + 1) { \
goto fallback; \
} \
} while (0)
#define CONSTRUCT_OP1(op) \
pic_list2(pic, \
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pic_obj_value(op), \
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analyze(state, pic_list_ref(pic, obj, 1), false))
#define CONSTRUCT_OP2(op) \
pic_list3(pic, \
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pic_obj_value(op), \
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analyze(state, pic_list_ref(pic, obj, 1), false), \
analyze(state, pic_list_ref(pic, obj, 2), false))
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static pic_value
analyze_node(analyze_state *state, pic_value obj, bool tailpos)
{
pic_state *pic = state->pic;
switch (pic_type(obj)) {
case PIC_TT_SYMBOL: {
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return analyze_var(state, pic_sym_ptr(obj));
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}
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)) {
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pic_sym *sym = pic_sym_ptr(proc);
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if (sym == pic->rDEFINE) {
return analyze_define(state, obj);
}
else if (sym == pic->rLAMBDA) {
return analyze_lambda(state, obj);
}
else if (sym == pic->rIF) {
return analyze_if(state, obj, tailpos);
}
else if (sym == pic->rBEGIN) {
return analyze_begin(state, obj, tailpos);
}
else if (sym == pic->rSETBANG) {
return analyze_set(state, obj);
}
else if (sym == pic->rQUOTE) {
return analyze_quote(state, obj);
}
else if (sym == state->rCONS) {
ARGC_ASSERT(2);
return CONSTRUCT_OP2(pic->sCONS);
}
else if (sym == state->rCAR) {
ARGC_ASSERT(1);
return CONSTRUCT_OP1(pic->sCAR);
}
else if (sym == state->rCDR) {
ARGC_ASSERT(1);
return CONSTRUCT_OP1(pic->sCDR);
}
else if (sym == state->rNILP) {
ARGC_ASSERT(1);
return CONSTRUCT_OP1(pic->sNILP);
}
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else if (sym == state->rSYMBOLP) {
ARGC_ASSERT(1);
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return CONSTRUCT_OP1(pic->sSYMBOLP);
}
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else if (sym == state->rPAIRP) {
ARGC_ASSERT(1);
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return CONSTRUCT_OP1(pic->sPAIRP);
}
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else if (sym == state->rADD) {
return analyze_add(state, obj, tailpos);
}
else if (sym == state->rSUB) {
return analyze_sub(state, obj);
}
else if (sym == state->rMUL) {
return analyze_mul(state, obj, tailpos);
}
else if (sym == state->rDIV) {
return analyze_div(state, obj);
}
else if (sym == state->rEQ) {
ARGC_ASSERT_WITH_FALLBACK(2);
return CONSTRUCT_OP2(pic->sEQ);
}
else if (sym == state->rLT) {
ARGC_ASSERT_WITH_FALLBACK(2);
return CONSTRUCT_OP2(pic->sLT);
}
else if (sym == state->rLE) {
ARGC_ASSERT_WITH_FALLBACK(2);
return CONSTRUCT_OP2(pic->sLE);
}
else if (sym == state->rGT) {
ARGC_ASSERT_WITH_FALLBACK(2);
return CONSTRUCT_OP2(pic->sGT);
}
else if (sym == state->rGE) {
ARGC_ASSERT_WITH_FALLBACK(2);
return CONSTRUCT_OP2(pic->sGE);
}
else if (sym == state->rNOT) {
ARGC_ASSERT(1);
return CONSTRUCT_OP1(pic->sNOT);
}
else if (sym == state->rVALUES) {
return analyze_values(state, obj, tailpos);
}
else if (sym == state->rCALL_WITH_VALUES) {
return analyze_call_with_values(state, obj, tailpos);
}
}
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fallback:
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return analyze_call(state, obj, tailpos);
}
default:
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return pic_list2(pic, pic_obj_value(pic->sQUOTE), obj);
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}
}
pic_value
pic_analyze(pic_state *pic, pic_value obj)
{
analyze_state *state;
state = new_analyze_state(pic);
obj = analyze(state, obj, true);
analyze_deferred(state);
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destroy_analyze_state(state);
return obj;
}
/**
* scope object
*/
typedef struct codegen_context {
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pic_sym *name;
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/* rest args variable is counted as a local */
bool varg;
xvect 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;
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/* symbol pool */
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pic_sym **syms;
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size_t slen, scapa;
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struct codegen_context *up;
} codegen_context;
/**
* global codegen state
*/
typedef struct codegen_state {
pic_state *pic;
codegen_context *cxt;
} codegen_state;
static void push_codegen_context(codegen_state *, pic_value, pic_value, pic_value, bool, pic_value);
static struct pic_irep *pop_codegen_context(codegen_state *);
static codegen_state *
new_codegen_state(pic_state *pic)
{
codegen_state *state;
state = pic_alloc(pic, sizeof(codegen_state));
state->pic = pic;
state->cxt = NULL;
push_codegen_context(state, pic_false_value(), pic_nil_value(), pic_nil_value(), false, pic_nil_value());
return state;
}
static struct pic_irep *
destroy_codegen_state(codegen_state *state)
{
pic_state *pic = state->pic;
struct pic_irep *irep;
irep = pop_codegen_context(state);
pic_free(pic, state);
return irep;
}
static void
create_activation(codegen_context *cxt)
{
size_t i, n;
xhash regs;
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pic_sym **var;
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size_t offset;
xh_init_ptr(&regs, sizeof(size_t));
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offset = 1;
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for (i = 0; i < xv_size(&cxt->args); ++i) {
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var = xv_get(&cxt->args, i);
n = i + offset;
xh_put_ptr(&regs, *var, &n);
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}
offset += i;
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for (i = 0; i < xv_size(&cxt->locals); ++i) {
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var = xv_get(&cxt->locals, i);
n = i + offset;
xh_put_ptr(&regs, *var, &n);
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}
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for (i = 0; i < xv_size(&cxt->captures); ++i) {
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var = xv_get(&cxt->captures, i);
if ((n = xh_val(xh_get_ptr(&regs, *var), size_t)) <= xv_size(&cxt->args) || (cxt->varg && n == xv_size(&cxt->args) + 1)) {
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/* copy arguments to capture variable area */
cxt->code[cxt->clen].insn = OP_LREF;
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cxt->code[cxt->clen].u.i = (int)n;
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cxt->clen++;
} else {
/* otherwise, just extend the stack */
cxt->code[cxt->clen].insn = OP_PUSHNONE;
cxt->clen++;
}
}
xh_destroy(&regs);
}
static void
push_codegen_context(codegen_state *state, pic_value name, pic_value args, pic_value locals, bool varg, pic_value captures)
{
pic_state *pic = state->pic;
codegen_context *cxt;
pic_value var;
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pic_sym *sym;
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assert(pic_sym_p(name) || pic_false_p(name));
cxt = pic_alloc(pic, sizeof(codegen_context));
cxt->up = state->cxt;
cxt->name = pic_false_p(name)
? pic_intern_cstr(pic, "(anonymous lambda)")
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: pic_sym_ptr(name);
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cxt->varg = varg;
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xv_init(&cxt->args, sizeof(pic_sym *));
xv_init(&cxt->locals, sizeof(pic_sym *));
xv_init(&cxt->captures, sizeof(pic_sym *));
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pic_for_each (var, args) {
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sym = pic_sym_ptr(var);
xv_push(&cxt->args, &sym);
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}
pic_for_each (var, locals) {
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sym = pic_sym_ptr(var);
xv_push(&cxt->locals, &sym);
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}
pic_for_each (var, captures) {
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sym = pic_sym_ptr(var);
xv_push(&cxt->captures, &sym);
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}
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;
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cxt->syms = pic_calloc(pic, PIC_SYMS_SIZE, sizeof(pic_sym *));
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cxt->slen = 0;
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cxt->scapa = PIC_SYMS_SIZE;
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state->cxt = cxt;
create_activation(cxt);
}
static struct pic_irep *
pop_codegen_context(codegen_state *state)
{
pic_state *pic = state->pic;
codegen_context *cxt = state->cxt;
struct pic_irep *irep;
/* create irep */
irep = (struct pic_irep *)pic_obj_alloc(pic, sizeof(struct pic_irep), PIC_TT_IREP);
irep->name = state->cxt->name;
irep->varg = state->cxt->varg;
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irep->argc = (int)xv_size(&state->cxt->args) + 1;
irep->localc = (int)xv_size(&state->cxt->locals);
irep->capturec = (int)xv_size(&state->cxt->captures);
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irep->code = pic_realloc(pic, state->cxt->code, sizeof(pic_code) * state->cxt->clen);
irep->clen = state->cxt->clen;
irep->irep = pic_realloc(pic, state->cxt->irep, sizeof(struct pic_irep *) * state->cxt->ilen);
irep->ilen = state->cxt->ilen;
irep->pool = pic_realloc(pic, state->cxt->pool, sizeof(pic_value) * state->cxt->plen);
irep->plen = state->cxt->plen;
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irep->syms = pic_realloc(pic, state->cxt->syms, sizeof(pic_sym *) * state->cxt->slen);
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irep->slen = state->cxt->slen;
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/* finalize */
xv_destroy(&cxt->args);
xv_destroy(&cxt->locals);
xv_destroy(&cxt->captures);
/* destroy context */
cxt = cxt->up;
pic_free(pic, state->cxt);
state->cxt = cxt;
return irep;
}
static int
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index_capture(codegen_state *state, pic_sym *sym, int depth)
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{
codegen_context *cxt = state->cxt;
size_t i;
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pic_sym **var;
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while (depth-- > 0) {
cxt = cxt->up;
}
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for (i = 0; i < xv_size(&cxt->captures); ++i) {
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var = xv_get(&cxt->captures, i);
if (*var == sym)
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return (int)i;
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}
return -1;
}
static int
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index_local(codegen_state *state, pic_sym *sym)
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{
codegen_context *cxt = state->cxt;
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size_t i, offset;
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pic_sym **var;
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offset = 1;
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for (i = 0; i < xv_size(&cxt->args); ++i) {
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var = xv_get(&cxt->args, i);
if (*var == sym)
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return (int)(i + offset);
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}
offset += i;
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for (i = 0; i < xv_size(&cxt->locals); ++i) {
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var = xv_get(&cxt->locals, i);
if (*var == sym)
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return (int)(i + offset);
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}
return -1;
}
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static int
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index_symbol(codegen_state *state, pic_sym *sym)
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{
pic_state *pic = state->pic;
codegen_context *cxt = state->cxt;
size_t i;
for (i = 0; i < cxt->slen; ++i) {
if (cxt->syms[i] == sym) {
return i;
}
}
if (cxt->slen >= cxt->scapa) {
cxt->scapa *= 2;
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cxt->syms = pic_realloc(pic, cxt->syms, sizeof(pic_sym *) * cxt->scapa);
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}
cxt->syms[cxt->slen++] = sym;
return i;
}
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static struct pic_irep *codegen_lambda(codegen_state *, pic_value);
static void
codegen(codegen_state *state, pic_value obj)
{
pic_state *pic = state->pic;
codegen_context *cxt = state->cxt;
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pic_sym *sym;
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sym = pic_sym_ptr(pic_car(pic, obj));
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if (sym == pic->sGREF) {
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cxt->code[cxt->clen].insn = OP_GREF;
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cxt->code[cxt->clen].u.i = index_symbol(state, pic_sym_ptr(pic_list_ref(pic, obj, 1)));
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cxt->clen++;
return;
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} else if (sym == pic->sCREF) {
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pic_sym *name;
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int depth;
depth = pic_int(pic_list_ref(pic, obj, 1));
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name = pic_sym_ptr(pic_list_ref(pic, obj, 2));
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cxt->code[cxt->clen].insn = OP_CREF;
cxt->code[cxt->clen].u.r.depth = depth;
cxt->code[cxt->clen].u.r.idx = index_capture(state, name, depth);
cxt->clen++;
return;
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} else if (sym == pic->sLREF) {
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pic_sym *name;
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int i;
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name = pic_sym_ptr(pic_list_ref(pic, obj, 1));
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if ((i = index_capture(state, name, 0)) != -1) {
cxt->code[cxt->clen].insn = OP_LREF;
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cxt->code[cxt->clen].u.i = i + (int)xv_size(&cxt->args) + (int)xv_size(&cxt->locals) + 1;
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cxt->clen++;
return;
}
cxt->code[cxt->clen].insn = OP_LREF;
cxt->code[cxt->clen].u.i = index_local(state, name);
cxt->clen++;
return;
} else if (sym == pic->sSETBANG) {
pic_value var, val;
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pic_sym *type;
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val = pic_list_ref(pic, obj, 2);
codegen(state, val);
var = pic_list_ref(pic, obj, 1);
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type = pic_sym_ptr(pic_list_ref(pic, var, 0));
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if (type == pic->sGREF) {
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cxt->code[cxt->clen].insn = OP_GSET;
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cxt->code[cxt->clen].u.i = index_symbol(state, pic_sym_ptr(pic_list_ref(pic, var, 1)));
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cxt->clen++;
cxt->code[cxt->clen].insn = OP_PUSHNONE;
cxt->clen++;
return;
}
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else if (type == pic->sCREF) {
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pic_sym *name;
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int depth;
depth = pic_int(pic_list_ref(pic, var, 1));
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name = pic_sym_ptr(pic_list_ref(pic, var, 2));
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cxt->code[cxt->clen].insn = OP_CSET;
cxt->code[cxt->clen].u.r.depth = depth;
cxt->code[cxt->clen].u.r.idx = index_capture(state, name, depth);
cxt->clen++;
cxt->code[cxt->clen].insn = OP_PUSHNONE;
cxt->clen++;
return;
}
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else if (type == pic->sLREF) {
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pic_sym *name;
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int i;
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name = pic_sym_ptr(pic_list_ref(pic, var, 1));
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if ((i = index_capture(state, name, 0)) != -1) {
cxt->code[cxt->clen].insn = OP_LSET;
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cxt->code[cxt->clen].u.i = i + (int)xv_size(&cxt->args) + (int)xv_size(&cxt->locals) + 1;
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cxt->clen++;
cxt->code[cxt->clen].insn = OP_PUSHNONE;
cxt->clen++;
return;
}
cxt->code[cxt->clen].insn = OP_LSET;
cxt->code[cxt->clen].u.i = index_local(state, name);
cxt->clen++;
cxt->code[cxt->clen].insn = OP_PUSHNONE;
cxt->clen++;
return;
}
}
else if (sym == pic->sLAMBDA) {
int k;
if (cxt->ilen >= cxt->icapa) {
cxt->icapa *= 2;
cxt->irep = pic_realloc(pic, cxt->irep, sizeof(struct pic_irep *) * cxt->icapa);
}
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k = (int)cxt->ilen++;
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cxt->code[cxt->clen].insn = OP_LAMBDA;
cxt->code[cxt->clen].u.i = k;
cxt->clen++;
cxt->irep[k] = codegen_lambda(state, obj);
return;
}
else if (sym == pic->sIF) {
int s, t;
codegen(state, pic_list_ref(pic, obj, 1));
cxt->code[cxt->clen].insn = OP_JMPIF;
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s = (int)cxt->clen++;
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/* if false branch */
codegen(state, pic_list_ref(pic, obj, 3));
cxt->code[cxt->clen].insn = OP_JMP;
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t = (int)cxt->clen++;
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cxt->code[s].u.i = (int)cxt->clen - s;
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/* if true branch */
codegen(state, pic_list_ref(pic, obj, 2));
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cxt->code[t].u.i = (int)cxt->clen - t;
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return;
}
else if (sym == pic->sBEGIN) {
pic_value elt;
int i = 0;
pic_for_each (elt, pic_cdr(pic, obj)) {
if (i++ != 0) {
cxt->code[cxt->clen].insn = OP_POP;
cxt->clen++;
}
codegen(state, elt);
}
return;
}
else if (sym == pic->sQUOTE) {
int pidx;
obj = pic_list_ref(pic, obj, 1);
switch (pic_type(obj)) {
case PIC_TT_BOOL:
if (pic_true_p(obj)) {
cxt->code[cxt->clen].insn = OP_PUSHTRUE;
} else {
cxt->code[cxt->clen].insn = OP_PUSHFALSE;
}
cxt->clen++;
return;
case PIC_TT_INT:
cxt->code[cxt->clen].insn = OP_PUSHINT;
cxt->code[cxt->clen].u.i = pic_int(obj);
cxt->clen++;
return;
case PIC_TT_NIL:
cxt->code[cxt->clen].insn = OP_PUSHNIL;
cxt->clen++;
return;
case PIC_TT_CHAR:
cxt->code[cxt->clen].insn = OP_PUSHCHAR;
cxt->code[cxt->clen].u.c = pic_char(obj);
cxt->clen++;
return;
default:
if (cxt->plen >= cxt->pcapa) {
cxt->pcapa *= 2;
cxt->pool = pic_realloc(pic, cxt->pool, sizeof(pic_value) * cxt->pcapa);
}
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pidx = (int)cxt->plen++;
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cxt->pool[pidx] = obj;
cxt->code[cxt->clen].insn = OP_PUSHCONST;
cxt->code[cxt->clen].u.i = pidx;
cxt->clen++;
return;
}
}
else if (sym == pic->sCONS) {
codegen(state, pic_list_ref(pic, obj, 1));
codegen(state, pic_list_ref(pic, obj, 2));
cxt->code[cxt->clen].insn = OP_CONS;
cxt->clen++;
return;
}
else if (sym == pic->sCAR) {
codegen(state, pic_list_ref(pic, obj, 1));
cxt->code[cxt->clen].insn = OP_CAR;
cxt->clen++;
return;
}
else if (sym == pic->sCDR) {
codegen(state, pic_list_ref(pic, obj, 1));
cxt->code[cxt->clen].insn = OP_CDR;
cxt->clen++;
return;
}
else if (sym == pic->sNILP) {
codegen(state, pic_list_ref(pic, obj, 1));
cxt->code[cxt->clen].insn = OP_NILP;
cxt->clen++;
return;
}
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else if (sym == pic->sSYMBOLP) {
codegen(state, pic_list_ref(pic, obj, 1));
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cxt->code[cxt->clen].insn = OP_SYMBOLP;
cxt->clen++;
return;
}
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else if (sym == pic->sPAIRP) {
codegen(state, pic_list_ref(pic, obj, 1));
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cxt->code[cxt->clen].insn = OP_PAIRP;
cxt->clen++;
return;
}
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else if (sym == pic->sADD) {
codegen(state, pic_list_ref(pic, obj, 1));
codegen(state, pic_list_ref(pic, obj, 2));
cxt->code[cxt->clen].insn = OP_ADD;
cxt->clen++;
return;
}
else if (sym == pic->sSUB) {
codegen(state, pic_list_ref(pic, obj, 1));
codegen(state, pic_list_ref(pic, obj, 2));
cxt->code[cxt->clen].insn = OP_SUB;
cxt->clen++;
return;
}
else if (sym == pic->sMUL) {
codegen(state, pic_list_ref(pic, obj, 1));
codegen(state, pic_list_ref(pic, obj, 2));
cxt->code[cxt->clen].insn = OP_MUL;
cxt->clen++;
return;
}
else if (sym == pic->sDIV) {
codegen(state, pic_list_ref(pic, obj, 1));
codegen(state, pic_list_ref(pic, obj, 2));
cxt->code[cxt->clen].insn = OP_DIV;
cxt->clen++;
return;
}
else if (sym == pic->sMINUS) {
codegen(state, pic_list_ref(pic, obj, 1));
cxt->code[cxt->clen].insn = OP_MINUS;
cxt->clen++;
return;
}
else if (sym == pic->sEQ) {
codegen(state, pic_list_ref(pic, obj, 1));
codegen(state, pic_list_ref(pic, obj, 2));
cxt->code[cxt->clen].insn = OP_EQ;
cxt->clen++;
return;
}
else if (sym == pic->sLT) {
codegen(state, pic_list_ref(pic, obj, 1));
codegen(state, pic_list_ref(pic, obj, 2));
cxt->code[cxt->clen].insn = OP_LT;
cxt->clen++;
return;
}
else if (sym == pic->sLE) {
codegen(state, pic_list_ref(pic, obj, 1));
codegen(state, pic_list_ref(pic, obj, 2));
cxt->code[cxt->clen].insn = OP_LE;
cxt->clen++;
return;
}
else if (sym == pic->sGT) {
codegen(state, pic_list_ref(pic, obj, 2));
codegen(state, pic_list_ref(pic, obj, 1));
cxt->code[cxt->clen].insn = OP_LT;
cxt->clen++;
return;
}
else if (sym == pic->sGE) {
codegen(state, pic_list_ref(pic, obj, 2));
codegen(state, pic_list_ref(pic, obj, 1));
cxt->code[cxt->clen].insn = OP_LE;
cxt->clen++;
return;
}
else if (sym == pic->sNOT) {
codegen(state, pic_list_ref(pic, obj, 1));
cxt->code[cxt->clen].insn = OP_NOT;
cxt->clen++;
return;
}
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else if (sym == pic->sCALL || sym == pic->sTAILCALL) {
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int len = (int)pic_length(pic, obj);
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pic_value elt;
pic_for_each (elt, pic_cdr(pic, obj)) {
codegen(state, elt);
}
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cxt->code[cxt->clen].insn = (sym == pic->sCALL) ? OP_CALL : OP_TAILCALL;
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cxt->code[cxt->clen].u.i = len - 1;
cxt->clen++;
return;
}
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else if (sym == pic->sCALL_WITH_VALUES || sym == pic->sTAILCALL_WITH_VALUES) {
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/* stack consumer at first */
codegen(state, pic_list_ref(pic, obj, 2));
codegen(state, pic_list_ref(pic, obj, 1));
/* call producer */
cxt->code[cxt->clen].insn = OP_CALL;
cxt->code[cxt->clen].u.i = 1;
cxt->clen++;
/* call consumer */
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cxt->code[cxt->clen].insn = (sym == pic->sCALL_WITH_VALUES) ? OP_CALL : OP_TAILCALL;
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cxt->code[cxt->clen].u.i = -1;
cxt->clen++;
return;
}
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else if (sym == pic->sRETURN) {
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int len = (int)pic_length(pic, obj);
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pic_value elt;
pic_for_each (elt, pic_cdr(pic, obj)) {
codegen(state, elt);
}
cxt->code[cxt->clen].insn = OP_RET;
cxt->code[cxt->clen].u.i = len - 1;
cxt->clen++;
return;
}
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pic_errorf(pic, "codegen: unknown AST type ~s", obj);
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}
static struct pic_irep *
codegen_lambda(codegen_state *state, pic_value obj)
{
pic_state *pic = state->pic;
pic_value name, args, locals, closes, body;
bool varg;
name = pic_list_ref(pic, obj, 1);
args = pic_list_ref(pic, obj, 2);
locals = pic_list_ref(pic, obj, 3);
varg = pic_true_p(pic_list_ref(pic, obj, 4));
closes = pic_list_ref(pic, obj, 5);
body = pic_list_ref(pic, obj, 6);
/* inner environment */
push_codegen_context(state, name, args, locals, varg, closes);
{
/* body */
codegen(state, body);
}
return pop_codegen_context(state);
}
struct pic_irep *
pic_codegen(pic_state *pic, pic_value obj)
{
codegen_state *state;
state = new_codegen_state(pic);
codegen(state, obj);
return destroy_codegen_state(state);
}
struct pic_proc *
pic_compile(pic_state *pic, pic_value obj, struct pic_lib *lib)
{
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_debug(pic, obj);
fprintf(stdout, "\n");
fprintf(stdout, "ai = %zu\n", pic_gc_arena_preserve(pic));
#endif
/* macroexpand */
obj = pic_macroexpand(pic, obj, lib);
#if DEBUG
fprintf(stdout, "## macroexpand completed\n");
pic_debug(pic, obj);
fprintf(stdout, "\n");
fprintf(stdout, "ai = %zu\n", pic_gc_arena_preserve(pic));
#endif
/* analyze */
obj = pic_analyze(pic, obj);
#if DEBUG
fprintf(stdout, "## analyzer completed\n");
pic_debug(pic, obj);
fprintf(stdout, "\n");
fprintf(stdout, "ai = %zu\n", pic_gc_arena_preserve(pic));
#endif
/* 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
pic_gc_arena_restore(pic, ai);
pic_gc_protect(pic, pic_obj_value(irep));
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return pic_make_proc_irep(pic, irep, NULL);
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}