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/* SPDX-License-Identifier: copyleft-next-0.3.1 */
/* Copyright 2023 Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
/**
* @file compiler.c
*
* Top level compiler implementation.
*/
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
#include <ek/actualize.h>
#include <ek/compiler.h>
#include <ek/string.h>
#include <ek/parser.h>
#include <ek/debug.h>
#include <ek/scope.h>
#include <ek/lower.h>
#include <ek/path.h>
#include <ek/res.h>
/**
* Read whole file into a buffer and return pointer to buffer.
* Possibly kind of silly to have both \p file and \p f.
* Apparently there's no standardized way to get the file name of a
* file pointer.
*
* @param file Name of file to read.
* @param f File pointer.
* @return Pointer to buffer with file contents.
*/
static char *read_file(const char *file, FILE *f)
{
fseek(f, 0, SEEK_END);
/** @todo check how well standardized this actually is */
long s = ftell(f);
if (s == LONG_MAX) {
error("%s might be a directory", file);
return NULL;
}
fseek(f, 0, SEEK_SET);
char *buf = malloc((size_t)(s + 1));
if (!buf)
return NULL;
fread(buf, (size_t)(s + 1), 1, f);
/* remember terminating null */
buf[s] = 0;
return buf;
}
/**
* Helper for process_file(), actually processes the file
* after process_file() has done path lookups and working directory
* changes and whatnot.
*
* @param parent Parent file context. \c NULL if root file.
* @param public \c 1 if file is being imported publicly, \c 0 otherwise.
* @param file File name to process.
* @return \c 0 if processing was succesful, non-zero value otherwise.
*/
static int process(struct scope **parent, int public, const char *file)
{
FILE *f = fopen(file, "rb");
if (!f) {
error("failed opening %s: %s\n", file, strerror(errno));
return -1;
}
const char *buf = read_file(file, f);
fclose(f);
if (!buf)
return -1;
struct parser *p = create_parser();
if (!p) {
free((void *)buf);
return -1;
}
parse(p, file, buf);
struct ast *tree = p->tree;
bool failed = p->failed;
destroy_parser(p);
if (failed) {
free((void*)buf);
return -1;
}
ast_dump_list(0, tree);
struct scope *scope = create_scope();
if (!scope) {
free((void *)buf);
return -1;
}
if (public)
scope_set_flags(scope, SCOPE_PUBLIC);
scope->fctx.fbuf = buf;
scope->fctx.fname = strdup(file);
scope_set_flags(scope, SCOPE_FILE);
if (*parent)
scope_add_scope(*parent, scope);
else
*parent = scope;
if (analyze_root(scope, tree))
return -1;
return 0;
}
#define MAP_KEY char *
#define MAP_TYPE struct scope *
#define MAP_CMP(a, b) strcmp((a), (b))
#define MAP_NAME scopes
#include "ek/map.h"
static int copy_scope(struct scope *to, struct scope *from)
{
/** @todo handle duplicates */
foreach_visible(n, from->symbols) {
struct ast *def = n->node;
if (!ast_flags(def, AST_FLAG_PUBLIC))
continue;
switch (def->k) {
case AST_PROC_DEF:
if (scope_add_proc(to, def))
return -1;
break;
case AST_VAR_DEF:
if (scope_add_var(to, def))
return -1;
break;
default: abort();
}
}
return 0;
}
/* ugly global for now */
static struct scopes scopes;
static void destroy_scopes()
{
foreach(scopes, n, &scopes) {
free(n->key);
}
scopes_destroy(&scopes);
}
int process_file(struct scope **scope, int public, const char *file)
{
int res = -1;
/** todo report failure allocating stuff maybe? */
struct res *r = res_create();
if (!r)
return -1;
const char *base = ek_basename(file);
res_add(r, (void *)base);
if (!base)
goto out;
const char *dir = ek_dirname(file);
res_add(r, (void *)dir);
if (!dir)
goto out;
/* TODO: iterate through include paths? */
const char *cwd = ek_cwdname();
res_add(r, (void *)cwd);
if (!cwd)
goto out;
if (*dir != 0 && chdir(dir)) {
error("couldn't change to directory %s: %s", dir, strerror(
errno));
goto out;
}
char *real = realpath(base, NULL);
assert(real);
struct scope **exists = scopes_find(&scopes, real);
if (exists) {
if (copy_scope(*scope, *exists))
goto out;
} else {
if (process(scope, public, base))
goto out;
scopes_insert(&scopes, real, *scope);
}
if (chdir(cwd)) {
error("couldn't change back to directory %s: %s\n", cwd,
strerror(
errno));
goto out;
}
res = 0;
out:
res_destroy(r);
return res;
}
int compile(const char *input) {
scopes = scopes_create();
int ret = -1;
struct scope *root = NULL;
if (process_file(&root, 0, input)) {
destroy_scope(root);
destroy_allocs();
destroy_scopes();
error("compilation of %s stopped due to errors", input);
return ret;
}
if ((ret = lower(root))) {
destroy_scope(root);
destroy_allocs();
destroy_scopes();
error("compilation of %s stopped due to errors", input);
return ret;
}
destroy_scope(root);
destroy_allocs();
destroy_scopes();
return 0;
}
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