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eval.c
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eval.c
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/* Copyright 2012-2020 Dustin DeWeese
This file is part of PoprC.
PoprC is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PoprC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with PoprC. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include "rt_types.h"
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <inttypes.h>
#if defined(USE_READLINE)
#include <readline/readline.h>
#include <readline/history.h>
#elif defined(USE_LINENOISE)
#include "linenoise/linenoise.h"
#else
#define RAW_LINE
#endif
#include "startle/error.h"
#include "startle/test.h"
#include "startle/support.h"
#include "startle/log.h"
#include "startle/static_alloc.h"
#include "cells.h"
#include "rt.h"
#include "special.h"
#include "eval.h"
#include "ir/compile.h"
#include "parse/parse.h"
#include "debug/print.h"
#include "gen/cgen.h"
#include "parse/lex.h"
#include "module.h"
#include "list.h"
#include "ir/trace.h"
#include "git_log.h"
#include "debug/log_tree.h"
#include "io.h"
#include "primitive/io.h"
#include "irc.h"
#include "gen/vlgen.h"
#include "command.h"
#include "parameters.h"
#ifdef EMSCRIPTEN
#include <emscripten.h>
#endif
#ifndef PREFIX
#define PREFIX "/usr/local"
#endif
#define HISTORY_FILE ".poprc_history"
#define RC_FILE ".poprc_rc"
bool quit = false;
bool command_line = false;
bool exit_on_error = false;
bool reinit_requested = false;
bool reinited_on_start = false;
static bool tty = false;
bool quiet = false;
static bool will_eval_commands = true;
static bool eval_commands = true;
const char *history_path = NULL;
cell_t *previous_result = NULL;
STATIC_ALLOC(line_buffer, char, 1024);
COMMAND(git, "git commit for this build") {
puts(GIT_LOG);
if(command_line) quit = true;
}
void stats_start() {
memset(&stats, 0, sizeof(stats));
stats.start = clock();
}
void stats_stop() {
memcpy(&saved_stats, &stats, sizeof(stats));
saved_stats.stop = clock();
saved_stats.alt_cnt = alt_cnt;
saved_stats.trace_cnt = trace_count();
}
void stats_display() {
double time = (saved_stats.stop - saved_stats.start) /
(double)CLOCKS_PER_SEC;
printf("time : %.3e sec\n"
"allocated : %d cells\n"
"working set : %d cells\n"
"reductions : %d\n"
"failures : %d\n"
"trace : %d\n",
time,
saved_stats.alloc_cnt,
saved_stats.max_alloc_cnt,
saved_stats.reduce_cnt,
saved_stats.fail_cnt,
saved_stats.trace_cnt
);
printf("rate :");
if(time != 0) {
printf(" %.3e reductions/sec",
saved_stats.reduce_cnt / time);
}
printf("\n"
"alts used : %d\n",
saved_stats.alt_cnt);
printf("static bytes : %ld\n", get_mem_size());
}
PARAMETER(echo, bool, false, "whether the input line is echoed") {
echo = arg;
}
COMMAND(stats, "print statistics") {
stats_display();
}
COMMAND(symbols, "print symbol table") {
print_symbols();
}
PARAMETER(run_leak_test, bool, true, "whether leak test is performed") {
run_leak_test = arg;
}
COMMAND(single, "eval one line and exit") {
will_eval_commands = rest && segcmp("yes", tok_seg(rest)) != 0;
}
COMMAND(eval, "evaluate the argument") {
cell_t *p = rest;
if(p) {
cell_t *e = NULL;
if((e = check_reserved(p))) {
const char *line = e->tok_list.line;
const char *loc = e->tok_list.location;
size_t size = strlen(line);
find_line(loc, &line, &size);
int pos = loc - line;
COUNTUP(i, pos + 2) putchar(' ');
printf("^--- Parse error\n");
} else {
seg_t src = src_text(p);
stats_start();
show_eval(" ", src, eval(p, &previous_result));
stats_stop();
}
}
}
const char *strip_dir(const char *path) {
const char *s = strrchr(path, '/');
return s ? s + 1 : path;
}
void eval_init() {
previous_result = NULL;
reinit_requested = false;
}
void load_rc(char *path) {
FILE *f = fopen(path, "r");
if(f) {
SHADOW(quiet, true) {
run_eval_minimal(f, false, false);
}
}
}
seg_t glue(const cell_t *t) {
seg_t s = tok_seg(t);
while((t = t->tok_list.next)) {
seg_t n = tok_seg(t);
if(!seg_adjacent(s, n)) break;
s.n += n.n;
}
return s;
}
STATIC_ALLOC(path_buffer, char, 64);
COMMAND(rc, "load an rc script") {
if(rest) {
seg_read(glue(rest), path_buffer, static_sizeof(path_buffer));
load_rc(path_buffer);
}
}
#ifndef EMSCRIPTEN
static
void crash_handler(int sig, UNUSED siginfo_t *info, UNUSED void *ctx) {
throw_error(ERROR_TYPE_UNEXPECTED, "%s", _, strsignal(sig));
}
int main(int argc, char **argv) {
struct sigaction sa;
sa.sa_flags = SA_SIGINFO;
sigemptyset(&sa.sa_mask);
sa.sa_sigaction = crash_handler;
sigaction(SIGSEGV, &sa, NULL);
static_alloc_init();
log_init();
io_init();
error_t error;
for(;;) {
CATCH(&error) {
printf(NOTE("ERROR") " ");
print_last_log_msg();
print_active_entries(" - while compiling ");
if(exit_on_error) {
printf("\nExiting on error.\n");
printf("\n___ LOG ___\n");
log_print_all();
return -error.type;
}
exit_on_error = true;
cleanup_cells();
} else {
if(reinit_requested) {
unload_files();
static_alloc_reinit();
log_init();
io_init();
trace_reinit();
} else {
log_soft_init();
}
cells_init();
parse_init();
module_init();
eval_init();
reset_counters();
char *home = getenv("HOME");
if(home) {
asprintf((char **)&history_path, "%s/" HISTORY_FILE, home);
char *rc_path;
asprintf((char **)&rc_path, "%s/" RC_FILE, home);
load_rc(rc_path);
free(rc_path);
}
command_line = true;
bool quit = false;
tty = isatty(fileno(stdin)) && isatty(fileno(stdout));
quiet = !tty;
cell_t *parsed_args = NULL;
if(argc >= 1) {
const char *exec_name = strip_dir(argv[0]);
char *args = arguments(argc - 1, argv + 1), *a = args;
// printf("__ arguments __\n%s", a);
if(strcmp(exec_name, "popr") == 0) {
eval_command_string(":ld " PREFIX "/share/poprc", 0);
eval_command_string(":import", 0);
}
if(args) {
// lex the arguments
cell_t **next = &parsed_args;
while(*a) {
char *e = strchr(a, '\n');
*e = '\0'; // HACKy (fix load_file instead)
*next = lex(a, e);
next = &(*next)->alt;
a = e + 1;
}
// run the commands
alloc_to(64); // keep allocations consistent regardless of args
cell_t *p = parsed_args;
while(p && !reinit_requested) {
quit = !eval_command(p) || quit;
free_toks(p);
p = p->alt;
}
free(args);
}
}
if(reinit_requested) {
reinited_on_start = true;
continue;
}
eval_commands = will_eval_commands;
exit_on_error = false;
command_line = false;
if(!quit) run_eval(echo);
drop(previous_result);
free_modules();
unload_files();
if(run_leak_test &&
!leak_test()) {
make_graph_all("leaks.dot");
}
free((void *)history_path);
return 0;
}
}
}
#else // EMSCRIPTEN
static
void emscripten_init(bool reinit) {
if(!reinit) {
static_alloc_init();
} else {
unload_files();
static_alloc_reinit();
}
log_init();
io_init();
cells_init();
parse_init();
module_init();
eval_init();
reset_counters();
trace_reinit();
eval_command_string(":load lib.ppr tests.ppr", 0);
eval_command_string(":import", 0);
}
int main(int argc, char **argv) {
emscripten_init(false);
emscripten_exit_with_live_runtime();
return 0;
}
#endif
#if defined(USE_LINENOISE) || defined(USE_READLINE)
/*
static seg_t last_tok(const char *str, const char *e) {
seg_t last, n;
while(n = tok(str, e, NULL), n.s) {
last = n;
str = seg_end(n);
}
return last;
}
*/
#endif
#ifdef USE_LINENOISE
/*
static void completion(char const *buf, linenoiseCompletions *lc) {
unsigned int n = strlen(buf);
seg_t t = last_tok(buf, buf + n);
if(!t.s) return;
word_entry_t *e = lookup_word(t);
if(e) {
// add completions
char *comp = malloc(n + 64);
strcpy(comp, buf);
do {
unsigned int entry_len = strlen(e->name);
int diff = entry_len - t.n;
if(diff > 0) {
comp = realloc(comp, n + diff + 1);
strcpy(comp + n, e->name + (entry_len - diff));
linenoiseAddCompletion(lc, comp);
}
e++; // FIXME
} while(strncmp(e->name, t.s, t.n) == 0);
free(comp);
}
}
*/
#endif
#ifdef USE_READLINE
/*
static char **completion(char *buf, UNUSED int start, UNUSED int end)
{
unsigned int current_match = 1;
char **matches = NULL;
unsigned int n = strlen(buf);
seg_t t = last_tok(buf, buf + n);
if(t.s) {
word_entry_t *e = lookup_word(t);
if(e) {
matches = malloc(sizeof(char *) * 16);
memset(matches, 0, sizeof(char *) * 16);
char *copy = malloc(t.n + 1);
seg_read(t, copy, t.n + 1);
matches[0] = copy;
// add completions
do {
unsigned int entry_len = strlen(e->name);
int diff = entry_len - t.n;
if(diff > 0) {
char *comp = malloc(n + diff + 1);
memcpy(comp, buf, n);
strcpy(comp + n, e->name + (entry_len - diff));
matches[current_match++] = comp;
}
e++; // FIXME
} while(strncmp(e->name, t.s, t.n) == 0 && current_match < 16);
// if there is just one match, make it the substitute
if(current_match == 2) {
free(matches[0]);
matches[0] = malloc(strlen(matches[1]) + 1);
strcpy(matches[0], matches[1]);
}
}
}
return matches;
}
*/
static void initialize_readline()
{
rl_readline_name = "PoprC";
/*
#if defined(__clang__)
rl_attempted_completion_function = (CPPFunction *)completion;
#else
rl_attempted_completion_function = (rl_completion_func_t *)completion;
#endif
*/
}
#endif
void run_eval_minimal(FILE *f, bool echo, bool tty) {
char *line;
while(tty && printf(": "),
(line = fgets(line_buffer, static_sizeof(line_buffer), f)))
{
replace_char(line, '\n', '\0');
if(line[0] == '\0') {
continue;
}
if(echo) puts(line);
bool run = eval_command_string(line, 0);
if(!run || !eval_commands || reinit_requested) break;
}
}
void run_eval(bool echo) {
#if defined(USE_READLINE)
if(tty) {
run_eval_readline(echo);
return;
}
#elif defined(USE_LINENOISE)
if(tty) {
run_eval_linenoise(echo);
return;
}
#endif
run_eval_minimal(stdin, echo, tty);
}
#ifdef USE_LINENOISE
void run_eval_linenoise(bool echo) {
char *line;
//linenoiseSetCompletionCallback(completion);
if(history_path) linenoiseHistoryLoad(history_path);
while((line = linenoise(": ")))
{
if(line[0] == '\0') {
free(line);
continue;
}
linenoiseHistoryAdd(line);
if(history_path) linenoiseHistorySave(history_path);
if(echo) puts(line);
bool run = eval_command_string(line, 0);
free(line);
if(!run || !eval_commands) break;
}
}
#endif
#ifdef USE_READLINE
void run_eval_readline(bool echo) {
char *line;
initialize_readline();
read_history(history_path);
while((line = readline(": ")))
{
if(line[0] == '\0') {
free(line);
continue;
}
add_history(line);
write_history(history_path);
if(echo) puts(line);
bool run = eval_command_string(line, 0);
free(line);
if(!run || !eval_commands) break;
}
}
#endif
COMMAND(modules, "print all modules") {
print_modules();
}
COMMAND(load, "load given file(s)") {
char buf[64];
while(rest) {
read_to_ws(&rest, buf, sizeof(buf));
load_file(0, buf);
}
}
COMMAND(ld, "load given dir(s)") {
char buf[64];
while(rest) {
read_to_ws(&rest, buf, sizeof(buf));
load_dir(buf);
}
}
COMMAND(arity, "print arity of the given function") {
csize_t in, out;
if(rest) {
if(get_arity(rest, &in, &out, eval_module())) {
printf("%d -> %d\n", in, out);
}
}
}
COMMAND(define, "define a function") {
cell_t *p = rest;
cell_t *name = p;
if(!name) return;
p = p->tok_list.next;
if(!p || segcmp(":", tok_seg(p)) != 0) return;
p = p->tok_list.next;
cell_t *expr = p;
if(!expr) return;
parse_eval_def(tok_seg(name), expr);
}
COMMAND(quit, "quit interpreter") {
if(rest) {
quit = segcmp("yes", tok_seg(rest)) == 0;
} else {
quit = true;
}
}
#ifdef EMSCRIPTEN
int emscripten_eval(char *str, int len) {
error_t error;
CATCH(&error) {
print_last_log_msg();
return -error.type;
} else {
eval_command_string(str, str + len);
if(reinit_requested) {
emscripten_init(true);
}
return 0;
}
}
#endif
bool eval_command(cell_t *p) {
if(match(p, ":")) {
if(eval_commands) {
p = p->tok_list.next;
stats_start();
if(!p || !run_command(tok_seg(p), p->tok_list.next)) {
printf("unknown command\n");
}
stats_stop();
}
} else {
command_eval(p);
}
return !quit;
}
bool eval_command_string(char *start, char *end) {
cell_t *p = lex(start, end);
bool ret = eval_command(p);
free_toks(p);
return ret;
}
static
bool can_reduce(cell_t *l) {
return
is_list(l) &&
list_size(l) > 0 &&
(is_value(l->value.ptr[0]) ||
closure_is_ready(l->value.ptr[0]));
}
void reduce_root(cell_t **cp, int depth, int limit) {
if(depth < limit) {
insert_root(cp);
reduce_list(cp, depth);
if(*cp) { // alt?
cell_t **p;
FORLIST(p, *cp, true) { // ***
if(can_reduce(*p)) reduce_root(p, depth + 1, limit);
}
}
remove_root(cp);
}
}
cell_t *eval_module() {
return modules ? get_module(string_seg("eval")) : NULL;
}
seg_t src_text(const cell_t *p) {
seg_t seg = { .s = p->tok_list.location };
while(p->tok_list.next) {
p = p->tok_list.next;
}
seg.n = seg_end(tok_seg(p)) - seg.s;
return seg;
}
size_t get_flattened_error_ranges(seg_t src, pair_t *res) {
if(!src.s || !src.n) return 0;
uintptr_t
l[fail_location_n],
r[fail_location_n];
// load offsets into l and r
COUNTUP(i, fail_location_n) {
l[i] = clamp(0, (intptr_t)src.n, fail_location[i].s - src.s);
r[i] = clamp(0, src.n, l[i] + fail_location[i].n);
}
return flatten_ranges(l, r, res, fail_location_n);
}
static
void print_seg_escape(seg_t seg) {
COUNTUP(i, seg.n) {
char c = seg.s[i];
switch(c) {
#if defined(EMSCRIPTEN)
case '[': printf("["); break;
case ']': printf("]"); break;
#endif
default: printf("%c", c); break;
}
}
}
void highlight_errors(seg_t src) {
pair_t res[fail_location_n];
size_t n = get_flattened_error_ranges(src, res);
uintptr_t last = 0;
COUNTUP(i, n) {
printf("%.*s", (int)(res[i].first - last), src.s + last);
printf(UNDERLINE_START);
print_seg_escape((seg_t) { .s = src.s + res[i].first, .n = res[i].second - res[i].first });
printf(UNDERLINE_END);
last = res[i].second;
}
printf("%.*s\n", (int)(src.n - last), src.s + last);
}
cell_t *eval(const cell_t *p, cell_t **previous) {
cell_t *c = NULL, *left = NULL;
bool incomplete = false;
clear_fail_log();
if(!match(p, "...")) {
drop(*previous);
*previous = NULL;
} else {
p = p->tok_list.next;
}
if(!allow_io && has_IO(p)) {
if(!quiet) printf("IO not allowed.\n");
} else {
c = parse_expr(&p, eval_module(), NULL);
if(!c) {
if(!quiet) {
printf("parse failure\n");
}
return NULL;
}
if(*previous) {
c = compose(list_begin(*previous), c); // TODO handle (*previous)->alt
drop(*previous);
*previous = NULL;
} else {
rt_init();
}
left = *leftmost(&c);
if(left && !closure_is_ready(left)) { // Automatic IO
incomplete = true;
if(allow_io && !has_IO(p)) {
arg(left, val(T_SYMBOL, SYM_IO));
}
}
if(!left || closure_is_ready(left)) {
reduce_root(&c, 0, reduction_limit);
if(c) {
ASSERT_REF();
*previous = c;
return c;
}
}
}
if(incomplete && empty_fail_log()) {
if(!quiet) printf("incomplete expression\n");
log_fail(left->src);
drop(c);
}
return NULL;
}
void show_eval(const char *prefix, seg_t src, const cell_t *c) {
if(c) {
show_alts(prefix, c);
} else if (!quiet) {
printf("\n");
highlight_errors(src);
printf(" |\n");
printf(" '-( " MARK("FAILED!") " )\n\n");
}
}
bool get_arity(const cell_t *p, csize_t *in, csize_t *out, cell_t *module) {
cell_t *c = parse_expr(&p, module, NULL);
if(!c) {
LOG("parse failed");
return false;
}
*in = function_in(c);
*out = function_out(c, false);
drop(c);
return true;
}
STATIC_ALLOC(files, struct mmfile, 16);
size_t files_cnt = 0;
bool load_file(int dirfd, const char *path) {
if(files_cnt >= files_size) {
if(!quiet) printf("Can't load any more files, `files` too small\n");
return false;
}
struct mmfile *f = &files[files_cnt++];
f->dirfd = dirfd;
f->path = path;
f->read_only = true;
if(!mmap_file(f)) {
if(!quiet) printf("Failed to open \"%s\"\n", path);
return false;
}
cell_t *toks = lex(f->data, f->data + f->size);
cell_t *e = NULL;
seg_t name;
if(!quiet) printf("Load %s ", path);
char *s = "(";
while(parse_module(&toks, &name, &e)) {
if(!quiet) printf("%s%.*s", s, (int)name.n, name.s);
s = ", ";
}
if(!quiet) printf(")\n");
if(e) {
const char *line = e->tok_list.line;
const char *loc = e->tok_list.location;
size_t size = f->size - (line - f->data);
find_line(loc, &line, &size);
printf("%.*s\n", (int)size, line);
int pos = loc - line;
int line_no = line_number(f->data, loc);
COUNTUP(i, pos) putchar(' ');
printf("^--- Parse error on line %d of %s\n", line_no, path);
}
free_toks(toks);
return true;
}
const char extension[4] = ".ppr";
bool load_dir(const char *path) {
DIR *dir = opendir(path);
if(!dir) return false;
int dfd = dirfd(dir);
bool res = true;
struct dirent *ent;
while((ent = readdir(dir))) {
size_t len = strlen(ent->d_name);
if(len >= sizeof(extension) &&
strncmp(ent->d_name + len - sizeof(extension), extension, sizeof(extension)) == 0) {
res &= load_file(dfd, ent->d_name);
}
}
return res;
}
bool unload_files() {
bool success = true;
COUNTUP(i, files_cnt) {
success &= munmap_file(&files[i]);
}
files_cnt = 0;
return success;
}
COMMAND(bits, "number of bits in a pointer") {
printf("%d\n", (int)sizeof_bits(void *));
if(command_line) quit = true;
}
void for_each_line(void (*f)(cell_t *, unsigned int)) {
unsigned int n = 0;
char *line;
while((line = fgets(line_buffer, static_sizeof(line_buffer), stdin)))
{
char *p = line;
while(*p && *p != '\n') ++p;
*p = 0;
if(line[0] == '\0') continue;
cell_t *l = lex(line, 0);
if(l) {
f(l, n++);
free_toks(l);
}
}
}
static
void print_toks_line(cell_t *l, UNUSED unsigned int n) {
print_toks(l);
}
COMMAND(lex, "lex and print the arguments") {
for_each_line(print_toks_line);
quit = true;
}
static
void parse_and_print_line(cell_t *l, UNUSED unsigned int n) {
cell_t *c = parse_expr((const cell_t **)&l, eval_module(), NULL);
if(c) {
show_list_elements(c);
drop(c);
putchar('\n');
}
}
COMMAND(parse, "parse and print input lines") {
for_each_line(parse_and_print_line);
quit = true;
}
static
void print_bytecode_line(cell_t *l, unsigned int n) {
char name_buf[8];
snprintf(name_buf, sizeof(name_buf), "fn%d", n++);
cell_t *e = parse_eval_def(string_seg(name_buf), l);
print_bytecode(tcell_entry(e), false);
}
COMMAND(bc_in, "print bytecode for each line") {
for_each_line(print_bytecode_line);
quit = true;
}
bool match_log_tag(const cell_t *p) {
return match_class(p, CC_ALPHA, sizeof(tag_t), sizeof(tag_t));
}
COMMAND(watch, "set a watched cell") {
if(match_class(rest, CC_NUMERIC, 0, 64)) {
int idx = parse_num(rest);
assert_throw(idx >= 0 && (unsigned int)idx < cells_size);
int i = set_watch(&cells[idx]);
if(i) {
printf("watch %d set: %d\n", i, idx);
} else {
printf("watch not set: %d\n", idx);
}
} else if(match_log_tag(rest)) {
const char *tag = rest->tok_list.location;
cell_t *p = rest->tok_list.next;
if(match(p, "..")) {
p = p->tok_list.next;
const char *tag_to;
if(!p) {
tag_to = NULL;
} else {
assert_throw(match_log_tag(p), "not a log tag");
tag_to = p->tok_list.location;
}
set_log_watch_range(tag, tag_to);
if(tag_to) {
printf("log watch set for tags in range: " FORMAT_TAG " .. " FORMAT_TAG "\n", tag, tag_to);
} else {
printf("log watch set for tags from: " FORMAT_TAG "\n", tag);
}
} else if(match(p, "+")) {
set_log_watch(tag, true);
printf("log watch set for like tags from: " FORMAT_TAG "\n", tag);
} else {
set_log_watch(tag, false);
printf("log watch set for tag: " FORMAT_TAG "\n", tag);
}
}
}
COMMAND(test, "run tests matching the argument") {
run_test(rest ? tok_seg(rest) : (seg_t){"", 0});
if(command_line) quit = true;
}
COMMAND(log, "print the log") {
log_print_all();
}
COMMAND(tweak, "tweak a value") {
bool set = false;
if(match_log_tag(rest)) {
const char *tag = rest->tok_list.location;
cell_t *arg = rest->tok_list.next;
bool after = match(arg, "+");
if(after) arg = arg->tok_list.next;
if(arg && arg->char_class == CC_NUMERIC) {
intptr_t val = parse_num(arg);
printf("tweak set%s: " FORMAT_TAG " => %d\n", after ? " starting at" : "", tag, (int)val);
log_set_tweak(tag, val, after);
set = true;
}
}
if(!set) {
printf("tweak unset\n");
log_unset_tweak();
}
}
void breakpoint_hook() {
if(!quiet) {
print_active_entries(" - while compiling ");
make_graph_all(NULL);
log_trees();
}
}
PARAMETER(allow_io, bool, true, "allow IO") {
allow_io = arg;
}
COMMAND(op, "set a watched op") {
if(rest) {
seg_t w = tok_seg(rest);
op op = OP_null;
if(segcmp("ap", w) == 0) {
op = OP_ap;